#magnesia chrome firebrick

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What is the composition of magnesia chrome brick?

Magnesia chrome bricks use high-quality sintered magnesia and chromite (Cr203 30%-15%, CaO 1%-5%) as the main raw materials. The production process of magnesia-chrome bricks is roughly similar to that of magnesia bricks. Non-fired magnesia chrome bricks use inorganic magnesium salt solution as a binder. During the firing process, due to the loosening effect caused by the expansion of spinel when MgO reacts with CrO3, Al2O3 or iron oxides, pre-synthesized magnesia sand can be used to make bricks, which must be fired in an oxidizing atmosphere above 1600 ° C. become. If the nature of the atmosphere changes, Fe203 in chromite is affected by the redox reaction to form iron oxides of various valences. At the same time, Cr203 is also reduced to produce different valence compounds. Under repeated reactions, bricks will be damaged, so products with high MgO and low Cr2O3 should be used as much as possible.

According to the raw materials and process characteristics of the products, it can be divided into fused-cast magnesia-chrome bricks, directly bonded magnesia-chrome bricks, silicate-bonded magnesia-chrome bricks, rebonded magnesia-chrome bricks, semi-rebonded magnesia-chrome bricks, pre-reacted magnesia-chrome bricks and non-reactive magnesia-chrome bricks. Burnt magnesia chrome brick. The following is an introduction to the composition of different types of magnesia-chrome bricks:

Composition of fused cast magnesia-chrome bricks

Fused-cast magnesia-chrome bricks are refractory products made from magnesia and chrome ore through electric melting and casting. The production process of fused cast magnesia-chrome bricks is shown in Figure 1. It is characterized by large and isolated pores, dense products, high strength, corrosion resistance, and sensitivity to temperature changes. The chemical properties of magnesia-chrome bricks are alkaline. Compared with magnesia bricks and slabs, they have good thermal shock resistance, stable volume at high temperatures, and high load softening temperature.

Directly combine the components of magnesia-chrome bricks

Directly bonded magnesia-chrome bricks are made by combining sintered magnesia and chromite. It is required that the SiO2 content of the raw material is low, and it is fired at a high temperature above 1700 ° C to form a direct bond between periclase and chromite particles. The typical physical and chemical properties of directly bonded magnesia-chrome bricks are: MgO 82.61%, Cr2O3 8.72%, SiO2 2.02%, apparent porosity 15%, and bulk density 3.08g/cm3. The compressive strength is 59.8MPa, the load softening temperature is 1765°C, the thermal shock resistance is 1100°C (water-cooled) 14 times, and the flexural strength is 8.33MPa.

Composition of silicate-bonded magnesia-chrome bricks

Silicate-bonded magnesia-chrome bricks are made by sintering magnesia and chrome ore as raw materials, blending them in appropriate proportions and firing them at high temperature. The mineral composition of the product is periclase, spinel and a small amount of silicate. The production of silicate-bonded magnesia-chrome bricks uses brick-making magnesia and general refractory grade chrome ore as raw materials, Si02<4% in magnesia, Mg0>90%, Cr203 in chromium ore 32%-45%, and sulfite as the main material. After binder, kneading and forming, it is fired at about 1600°C. In order to prevent abnormal expansion of products during firing, a weak oxidizing atmosphere must be maintained in the kiln. The chemical composition of the product: Si02 2.98%-4.50%, MgO 61.75%-72.69%, Cr203 10.04%-14.90%. Physical properties: apparent porosity 18%-21%, normal temperature compressive strength 36.1-50.OMPa, load softening temperature 1600-1640℃.

Combining the composition of magnesia-chrome bricks

Recombined magnesia-chrome bricks are made by sintering fused magnesia-chrome sand as raw material. Fused magnesia-chrome sand has poor sinterability, and the product is a fine-grained matrix with uniform distribution of pores and tiny cracks. It is more sensitive to sudden temperature changes than fused cast bricks. The high-temperature performance of the product is between the fused cast brick and the direct bonded brick. The typical physical and chemical properties of combined magnesia-chrome bricks are: MgO 68%, Cr203 15%, SiO2 3%, apparent porosity 14%. Bulk density 3.20g/cm3, compressive strength 52.8MPa, load softening temperature 1740℃, flexural resistance Strength 7.86MPa.

Composition of semi-recombined magnesia-chrome bricks

Semi-recombined magnesia-chrome bricks are made from fused magnesia-chrome sand and magnesia, chromite or pre-reacted magnesia-chrome sand. The products have some characteristics of recombined magnesia-chrome bricks and directly combined magnesia-chrome bricks or pre-reaction magnesia-chrome bricks. The typical physical and chemical properties of semi-recombined magnesia-chrome bricks are: MgO 71.58%, Cr2O3 16.45%, SiO2 2.75%, apparent porosity 13%. Compressive strength 46.7MPa, load softening temperature 1760℃, flexural strength 9.09MPa.

Composition of pre-reaction magnesia-chrome bricks

Pre-reacted magnesia-chrome bricks are made of all or part of pre-reacted magnesia-chrome sand. The production cost is lower than that of recombined magnesia-chrome bricks. The partial reaction between magnesia and chromite is completed when the clinker is calcined, so the apparent porosity of the product is lower than that of the directly bonded brick with the same composition, and the high temperature strength is high. The typical composition of pre-reaction magnesia-chrome bricks is: MgO 62.8%, Cr2O3 15.3%, SiO2 3.25%, apparent porosity 17%, compressive strength 51.3MPa, load softening temperature 1650℃.

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Global Boiler Refractory Material Market Outlook, Competitive Landscape and Forecasts to 2023

Refractory material is also defined as non-metallic material with physical and chemical properties exposed to temperature above 1,000°F. Refractory materials are widely used in kilns, furnaces, reactors, and incinerators. It is primarily used inside the boiler to minimize heat losses from the furnace and produce heat by burning of the fuel in the furnace. The refractory inside boiler plays an important role in protecting the boiler structure and increasing its operational efficiency. However, the refractory used inside the boiler furnace should not pollute the material with which it interacts.

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Boiler refractory materials exhibit sufficient mechanical strength and can withstand various forces such as vibration action, weight of adjacent brickwork, flue dust, cutting & abrasive action of frame, high temperature, load at service conditions, and sudden changes in temperature. Materials used to make refractory are SiC, MgO, fireclay, etc. These have high melting point in the range of 1800°C to 2800°C. Refractory materials are also used to maintain commercial and industrial boilers. Boiler refractory materials are primarily causes of boiler outages and energy losses. Growth of end-user industries such as iron and steel and increase in demand for high performance furnaces and boilers are expected to drive the global boiler refractory material market in the near future.

The boiler refractory material market can be segmented based on raw material, type of refractory, and region. In terms of raw material, the market can be divided into acid materials, neutral materials, and alkaline or base materials. Acid materials consist of silica, clay, quartz, and sandstone. Neutral materials comprise graphite, chromite, plumbago, and alumina. Alkaline or base materials consist of magnesia, lime, and zirconia. Based on type of refractory, the market can be segregated into firebricks and monolithic refractory. Firebricks refractory materials have been widely used over a long period of time. Firebricks refractory material is developed to bricks at high temperatures in insulated chambers. High strength, hassle-free performance, low maintenance costs and high temperature resistance are anticipated to drive the firebricks form of refractory.

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Monolithic refractory materials are shapeless; however, it has been a favorable option in the industry over the last few years. Monolithic refractory material is primarily used due to its fast installation time, economic considerations, need of less manpower for installation, and low raw materials cost. It exhibits various key properties including chemical inertness, abrasion resistance, thermal shock resistance, and mechanical integrity. Monolithic boiler refractory can be further sub-segmented into moldable refractory, castable refractory, ramming refractory, gunning refractory, coating refractory, and plastic chrome core.

Based on region, the boiler refractory material market can be segregated into North America, Latin America, Middle East & Africa, Europe, and Asia Pacific. Asia Pacific is the key region of the boiler refractory material market. Countries such as China and India in the region are the fastest-growing markets for boiler refractory material due to the increase in usage of refractories in cement, iron & steel, glass, non-ferrous metals, and other industries. The market in other countries in Southeast Asia such as Indonesia, Malaysia, Thailand, and Vietnam has also been expanding rapidly due to the rise in demand for iron & steel, cement, and glass. Cement and iron & steel are primarily used in automotive, construction, and other manufacturing sectors in Asia Pacific. Europe is also a key market for boiler refractory material, followed by North America.

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TMR’s data repository is continuously updated and revised by a team of research experts so that it always reflects the latest trends and information. With extensive research and analysis capabilities, Transparency Market Research employs rigorous primary and secondary research techniques to develop distinctive data sets and research material for business reports.

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Boiler Refractory Material Market Expected to Boost Revenue Growth During 2017 – 2025

Refractory material is also defined as non-metallic material with physical and chemical properties exposed to temperature above 1,000°F. Refractory materials are widely used in kilns, furnaces, reactors, and incinerators. It is primarily used inside the boiler to minimize heat losses from the furnace and produce heat by burning of the fuel in the furnace. The refractory inside boiler plays an important role in protecting the boiler structure and increasing its operational efficiency. However, the refractory used inside the boiler furnace should not pollute the material with which it interacts.

Boiler refractory materials exhibit sufficient mechanical strength and can withstand various forces such as vibration action, weight of adjacent brickwork, flue dust, cutting & abrasive action of frame, high temperature, load at service conditions, and sudden changes in temperature. Materials used to make refractory are SiC, MgO, fireclay, etc. These have high melting point in the range of 1800°C to 2800°C. Refractory materials are also used to maintain commercial and industrial boilers. Boiler refractory materials are primarily causes of boiler outages and energy losses. Growth of end-user industries such as iron and steel and increase in demand for high performance furnaces and boilers are expected to drive the global boiler refractory material market in the near future.

The boiler refractory material market can be segmented based on raw material, type of refractory, and region. In terms of raw material, the market can be divided into acid materials, neutral materials, and alkaline or base materials. Acid materials consist of silica, clay, quartz, and sandstone. Neutral materials comprise graphite, chromite, plumbago, and alumina. Alkaline or base materials consist of magnesia, lime, and zirconia. Based on type of refractory, the market can be segregated into firebricks and monolithic refractory. Firebricks refractory materials have been widely used over a long period of time. Firebricks refractory material is developed to bricks at high temperatures in insulated chambers. High strength, hassle-free performance, low maintenance costs and high temperature resistance are anticipated to drive the firebricks form of refractory.

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Monolithic refractory materials are shapeless; however, it has been a favorable option in the industry over the last few years. Monolithic refractory material is primarily used due to its fast installation time, economic considerations, need of less manpower for installation, and low raw materials cost. It exhibits various key properties including chemical inertness, abrasion resistance, thermal shock resistance, and mechanical integrity. Monolithic boiler refractory can be further sub-segmented into moldable refractory, castable refractory, ramming refractory, gunning refractory, coating refractory, and plastic chrome core.

Based on region, the boiler refractory material market can be segregated into North America, Latin America, Middle East & Africa, Europe, and Asia Pacific. Asia Pacific is the key region of the boiler refractory material market. Countries such as China and India in the region are the fastest-growing markets for boiler refractory material due to the increase in usage of refractories in cement, iron & steel, glass, non-ferrous metals, and other industries. The market in other countries in Southeast Asia such as Indonesia, Malaysia, Thailand, and Vietnam has also been expanding rapidly due to the rise in demand for iron & steel, cement, and glass. Cement and iron & steel are primarily used in automotive, construction, and other manufacturing sectors in Asia Pacific. Europe is also a key market for boiler refractory material, followed by North America.

About Us

Transparency Market Research (TMR) is a global market intelligence company providing business information reports and services. The company’s exclusive blend of quantitative forecasting and trend analysis provides forward-looking insight for thousands of decision makers. TMR’s experienced team of analysts, researchers, and consultants use proprietary data sources and various tools and techniques to gather and analyze information.

TMR’s data repository is continuously updated and revised by a team of research experts so that it always reflects the latest trends and information. With extensive research and analysis capabilities, Transparency Market Research employs rigorous primary and secondary research techniques to develop distinctive data sets and research material for business reports.

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Boiler Refractory Material Market to Observe Strong Development by 2025

Refractory material is also defined as non-metallic material with physical and chemical properties exposed to temperature above 1,000°F. Refractory materials are widely used in kilns, furnaces, reactors, and incinerators. It is primarily used inside the boiler to minimize heat losses from the furnace and produce heat by burning of the fuel in the furnace. The refractory inside boiler plays an important role in protecting the boiler structure and increasing its operational efficiency. However, the refractory used inside the boiler furnace should not pollute the material with which it interacts.

 Read Report Overview @

https://www.transparencymarketresearch.com/boiler-refractory-material-market.html

 Boiler refractory materials exhibit sufficient mechanical strength and can withstand various forces such as vibration action, weight of adjacent brickwork, flue dust, cutting & abrasive action of frame, high temperature, load at service conditions, and sudden changes in temperature. Materials used to make refractory are SiC, MgO, fireclay, etc. These have high melting point in the range of 1800°C to 2800°C. Refractory materials are also used to maintain commercial and industrial boilers. Boiler refractory materials are primarily causes of boiler outages and energy losses. Growth of end-user industries such as iron and steel and increase in demand for high performance furnaces and boilers are expected to drive the global boiler refractory material market in the near future.

 The boiler refractory material market can be segmented based on raw material, type of refractory, and region. In terms of raw material, the market can be divided into acid materials, neutral materials, and alkaline or base materials. Acid materials consist of silica, clay, quartz, and sandstone. Neutral materials comprise graphite, chromite, plumbago, and alumina. Alkaline or base materials consist of magnesia, lime, and zirconia. Based on type of refractory, the market can be segregated into firebricks and monolithic refractory. Firebricks refractory materials have been widely used over a long period of time. Firebricks refractory material is developed to bricks at high temperatures in insulated chambers. High strength, hassle-free performance, low maintenance costs and high temperature resistance are anticipated to drive the firebricks form of refractory.

 Monolithic refractory materials are shapeless; however, it has been a favorable option in the industry over the last few years. Monolithic refractory material is primarily used due to its fast installation time, economic considerations, need of less manpower for installation, and low raw materials cost. It exhibits various key properties including chemical inertness, abrasion resistance, thermal shock resistance, and mechanical integrity. Monolithic boiler refractory can be further sub-segmented into moldable refractory, castable refractory, ramming refractory, gunning refractory, coating refractory, and plastic chrome core.

 Based on region, the boiler refractory material market can be segregated into North America, Latin America, Middle East & Africa, Europe, and Asia Pacific. Asia Pacific is the key region of the boiler refractory material market. Countries such as China and India in the region are the fastest-growing markets for boiler refractory material due to the increase in usage of refractories in cement, iron & steel, glass, non-ferrous metals, and other industries. The market in other countries in Southeast Asia such as Indonesia, Malaysia, Thailand, and Vietnam has also been expanding rapidly due to the rise in demand for iron & steel, cement, and glass. Cement and iron & steel are primarily used in automotive, construction, and other manufacturing sectors in Asia Pacific. Europe is also a key market for boiler refractory material, followed by North America.

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https://www.transparencymarketresearch.com/sample/sample.php?flag=B&rep_id=38654

 Key players operating in the global boiler refractory material market include TRL KROSAKI, American Boiler Company, Manley's Boiler, Inc., Ranchi Refractories (India) Pvt Ltd, Magnesita Refratários S.A., and Calderys.

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Boiler Refractory Material Market Set for Rapid Growth And Trend | 2025

Refractory material is also defined as non-metallic material with physical and chemical properties exposed to temperature above 1,000°F. Refractory materials are widely used in kilns, furnaces, reactors, and incinerators. It is primarily used inside the boiler to minimize heat losses from the furnace and produce heat by burning of the fuel in the furnace. The refractory inside boiler plays an important role in protecting the boiler structure and increasing its operational efficiency. However, the refractory used inside the boiler furnace should not pollute the material with which it interacts.

Request Report Brochure @ https://www.transparencymarketresearch.com/sample/sample.php?flag=B&rep_id=38654

Boiler refractory materials exhibit sufficient mechanical strength and can withstand various forces such as vibration action, weight of adjacent brickwork, flue dust, cutting & abrasive action of frame, high temperature, load at service conditions, and sudden changes in temperature. Materials used to make refractory are SiC, MgO, fireclay, etc. These have high melting point in the range of 1800°C to 2800°C. Refractory materials are also used to maintain commercial and industrial boilers. Boiler refractory materials are primarily causes of boiler outages and energy losses. Growth of end-user industries such as iron and steel and increase in demand for high performance furnaces and boilers are expected to drive the global boiler refractory material market in the near future.

The boiler refractory material market can be segmented based on raw material, type of refractory, and region. In terms of raw material, the market can be divided into acid materials, neutral materials, and alkaline or base materials. Acid materials consist of silica, clay, quartz, and sandstone. Neutral materials comprise graphite, chromite, plumbago, and alumina. Alkaline or base materials consist of magnesia, lime, and zirconia. Based on type of refractory, the market can be segregated into firebricks and monolithic refractory. Firebricks refractory materials have been widely used over a long period of time. Firebricks refractory material is developed to bricks at high temperatures in insulated chambers. High strength, hassle-free performance, low maintenance costs and high temperature resistance are anticipated to drive the firebricks form of refractory.

Read Report Overview @ https://www.transparencymarketresearch.com/boiler-refractory-material-market.html

Monolithic refractory materials are shapeless; however, it has been a favorable option in the industry over the last few years. Monolithic refractory material is primarily used due to its fast installation time, economic considerations, need of less manpower for installation, and low raw materials cost. It exhibits various key properties including chemical inertness, abrasion resistance, thermal shock resistance, and mechanical integrity. Monolithic boiler refractory can be further sub-segmented into moldable refractory, castable refractory, ramming refractory, gunning refractory, coating refractory, and plastic chrome core.

About Us

Transparency Market Research (TMR) is a global market intelligence company providing business information reports and services. The company’s exclusive blend of quantitative forecasting and trend analysis provides forward-looking insight for thousands of decision makers. TMR’s experienced team of analysts, researchers, and consultants use proprietary data sources and various tools and techniques to gather and analyze information.

TMR’s data repository is continuously updated and revised by a team of research experts so that it always reflects the latest trends and information. With extensive research and analysis capabilities, Transparency Market Research employs rigorous primary and secondary research techniques to develop distinctive data sets and research material for business reports.

Contact

Transparency Market Research

State Tower,

90 State Street,

Suite 700,

Albany NY – 12207

United States

Tel: +1-518-618-1030

USA – Canada Toll Free: 866-552-3453

Email: sales@transparencymarketresearch.com

Website: http://www.transparencymarketresearch.com

[zhenjin-refractory0211]

What are the classifications of magnesia chrome bricks

Magnesia chrome brick is composed of MgO55%80%, Cr2O38%20% partial alkali refractory thermal insulation materials crafts, with magnesia, compound spinel and a small amount of silicate phase. Compound spinel contains solid solutions of MgAl2O4, MgFe2O4, MgCr2O4 and FeAl2O4.

Magnesia chrome bricks in the 20th century after the 60 era because of the purity of raw materials and firing temperature to improve the rapid development trend, the current magnesia chrome bricks according to the different production methods can be divided into general bricks, immediate fusion bricks, mutual sintering bricks, refusion bricks and fused bricks.

(1) General magnesia-chrome brick

It is a traditional commodity, with chromium ore as coarse particulate matter and magnesia as fine powder. Or the two raw materials are composed of graded particles, and the firing temperature is generally 1550-1600 ° C. The microstructure of this kind of brick mainly shows that there is little immediate fusion between chromium ore particles and cubic magnesite, and more silicate (CMS) fine sand or crack protection. There is little dissolved phase in the cubic magnesite, very little immediate fusion in the cultivation medium, and this kind of brick has poor physical properties and poor slag corrosion resistance.

(2) Immediately fuse magnesia-chrome brick

Immediate fusion magnesia-chrome brick is in the general magnesia-chrome brick basic development trend, its production characteristics are key to two points, one is the selection of more pure raw materials, the second is the selection of higher firing temperature. In plain words, immediate fusion refers to the chromium ore particles in the brick and the cubic magnesite in the middle of more immediate contact, due to the raw material SiO2 less (manipulation in 1%25% below), the silicate generation is less, according to the high temperature firing method to make the silicate extrusion molding to the corner of the solid particles. This improves immediate solid phase fusion.

Immediate fusion magnesium-chrome brick because of the high level of immediate fusion, so that the brick has a high temperature compressive strength, slag resistance, corrosion resistance, erosion resistance, corrosion resistance and high-quality thermal shock reliability and volume reliability at 1800℃.

(3) mutually calcined magnesia-chrome bricks

The characteristics of this kind of handicraft production process is to burn the mixture of magnesia and chromium ore fine powder according to a certain preparation at high temperature, maintain the conversion into secondary spinel and magnesia-chromium ore immediate fusion for the purpose of solid phase reaction, prepare mutual calcined materials, and use this material to produce burnt products or organic chemical fusion crafts.

The immediate fusion and microstructure uniformity of intercalcined magnesia-chrome bricks are stronger than those of immediate fusion bricks, and there is a large amount of brucite dedissolved phase and intergranular secondary spinel. The intercalcined magnesia-chrome bricks have a series of stronger characteristics than immediate fusion bricks, especially famous for high temperature compressive strength, temperature resistance and slag resistance.

Mutual sintered bricks can be divided into two types, one is all mutual sintered bricks, particulate matter and fine powder new mutual calciners, whether fired or organic chemical fusion of their microstructure is mostly similar; The second is a part of the mutual sintering bricks, a part of the raw materials, such as coarse particles with mutual calcining materials, and a part of the fine powder can be mixed with fine chromium ore and magnesia paper powder according to a certain proportion of the brick, so that the fired and organic chemical fusion crafts will have a certain difference in microstructure.

(4) Re-fusion magnesia-chrome brick

Magnesia-chromium mixture particles are melted by electromelting tube method, and according to the crystallization of the solution, a raw material with a very symmetrical microstructure and composed of magnesia-chromium spinel and cubic magnesite mixed crystals as the key phase is produced. Such electromelting magnesia-chromium material is broken into a certain particle size distribution, mixed and formed, and fired to produce refused bricks, or immediately used as organic chemical junction bricks.

The microstructure of the refused brick is characterized by the immediate fusion of the aspect ratio and the presence of a lot of spinel dissolubilized phase: the base crystal with a lot of dissolubilized phase substantially changes the physical properties of the brucite, such as reducing the coefficient of linear expansion, improving the heat resistance, and improving the resistance to acid-alkali slag corrosion. The refused brick has similar characteristics to the actual application of fused cast brick, but has stronger temperature snap resistance and more symmetrical microstructure than fused cast brick.

The refused magnesium-chrome brick has a well-proportioned sand and gravel culture medium, and has fine cracks, and is more sensitive to sudden temperature changes than the fusion casting. The high temperature characteristics of handicrafts are close to the middle of fused cast bricks and immediately fused bricks.

(5) Cast magnesia-chrome brick

Magnesia and chromium mineral compounds are thoroughly melted in an electric arc furnace, and then the solution is forged into a fireproof casting mold. In the whole process of condensation, it is transformed into a smooth brucite and spinel crystal phase, and a fine crystal mechanism is produced, so the fused cast magnesia-chromium brick has excellent high temperature compressive strength and slag corrosion resistance.

Molten magnesium-chromium brick and electromolten magnesium-chromium material, with the height to width ratio of immediate fusion and with a lot of spinel dissolved phase, this kind of crafts caused by high relative density, slag is not easy to penetrate, so the slag resistance to improve the immediate fusion brick is stronger, but the heat resistance is worse than the two crafts.

In terms of the principle of relative ash infiltration of fused magnesia-chrome bricks, it has the advantage of being different, because it is a high-density frit made by melting, pouring, and overall water cooling, the slag only has the effect of erosion on the surface of the brick, and it is unlikely to penetrate (which has been confirmed by the cross-sectional assessment of the fused magnesia-chrome bricks after application). Therefore, although the production of fused magnesium-chromium bricks is difficult and expensive, the key parts of the non-ferrous plate smelting furnace in technical capitalist countries still retain the advantages and influence that other refractory insulation materials can not replace.

[zhenjin-refractory0211]

The use of magnesia chrome bricks

common magnesia-chrome bricks include ordinary magnesia-chrome bricks, electro-fused rebonded magnesia-chrome bricks, direct-bonded magnesia-chrome bricks and sintered magnesia-chrome bricks. The main components are magnesia and chromium trioxide, which are characterized by high temperature strength and alkali resistance. Slag erosion ability is strong. The main crystal phase of magnesia-chrome bricks is mainly periclase and magnesia-chrome spinel.

First, the use of magnesia chrome bricks:

Magnesia chrome bricks are mainly used in the metallurgical industry, such as building open hearth furnace roofs, electric furnace roofs, refining furnaces outside furnaces and various non-ferrous metal smelting furnaces. The high-temperature part of the high-power electric furnace wall adopts fused-cast magnesia-chrome bricks, the high-erosion area of the refining furnace outside the furnace adopts magnesia-chrome bricks made of synthetic materials, and the high-erosion area of the non-ferrous metal flash smelting furnace is used.

Second, the characteristics of magnesia chrome bricks:

(1) High refractory temperature.

(2) The temperature of the 0.2MPA load softening edge is high.

(3) Strong resistance to alkaline slag.

(4) High temperature strength.

(5) Excellent volume stability at high temperature.

(6) The standard size is accurate and the construction is convenient, and the size can be processed according to the drawing.

There. Detection rules for magnesia chrome bricks：

1. The weight of each batch of bricks shall not exceed 100t.

2. Sampling and acceptance of bricks shall be carried out in accordance with YB 367-75 "Rules for Sampling, Acceptance, Storage and Transportation of Refractory Products".

3. Packaging, transportation, storage and quality certificate

4. The packaging, transportation and storage of bricks shall be carried out according to YB 367-75.

5. When the brick is issued, it is accompanied by a quality certificate issued by the technical supervision department, the name of the supplier or the factory logo, the name of the buyer, the date of delivery, the contract number, the standard number, the product name, the grade, the brick number, the batch number, and the size , appearance, section and physical and chemical indicators and other results.

[zhenjin-refractory0211]

Advantages of magnesia chrome bricks

Magnesia-chrome bricks are refractory products composed of magnesium oxide (MgO) and chromium trioxide (Cr2O3) as the main components, and periclase and spinel as the main mineral components. They are alkaline refractory products. This type of brick has high refractoriness, high temperature strength, strong corrosion resistance to alkaline slag, excellent thermal stability, and certain adaptability to acid slag. Magnesia-chrome bricks are generally fired with lightly burned magnesia and imported chrome ore, also known as ordinary sintered magnesia-chrome bricks, or magnesia-chrome bricks for short. The firing process of magnesia-chrome bricks is roughly similar to that of magnesia bricks.

Magnesia chrome brick features: The refractoriness is greater than 2000°C, the softening temperature under load is generally above 1550°C, the high temperature volume stability is good, and the rapid cooling and heat resistance is good.

Application fields of magnesia chrome bricks: Mainly used in cement rotary kiln, glass kiln regenerator, steelmaking furnace lining, permanent layer of refining ladle, nonferrous metallurgical furnace, lime kiln, mixed iron furnace and refractory material high temperature kiln lining, etc.; also used in open hearth furnace roof and electric furnace Furnace roof, refining furnace outside the furnace and various non-ferrous metal smelting furnaces. https://www.zj-refractory.com/products/magnesia-chrome-bricks.html

[zhenjin-refractory0211]

Types of magnesia chrome bricks

Magnesia chrome bricks are refractory products composed of magnesium oxide (MgO) and chromium trioxide (Cr2O3) as the main components, and periclase and spinel as the main mineral components. They are alkaline refractory products. This type of brick has high refractoriness, high temperature strength, strong corrosion resistance to alkaline slag, excellent thermal stability, and certain adaptability to acid slag. Magnesia-chrome bricks are generally fired with lightly burned magnesia and imported chrome ore, also known as ordinary sintered magnesia-chrome bricks, or magnesia-chrome bricks for short.

Sintered magnesia and fused magnesia with different MgO mass fractions (generally greater than 89%) are matched with refractory grade chromium ore, chrome concentrate, sintered or fused magnesia with different Cr2O3 mass fractions (sometimes adding a small amount Chrome green), producing many varieties of magnesium chrome products.

The most popular types of magnesia chrome bricks today are ordinary magnesia-chrome bricks, direct bonded magnesia-chrome bricks, recombined (semi-recombined) magnesia-chrome bricks and unfired magnesia-chrome bricks.

Ordinary magnesia chrome brick:

Ordinary magnesia-chrome bricks are generally produced from sintered magnesia (MgO mass fraction between 89% and 92%) and refractory grade chrome ore as raw materials. Due to the large amount of impurities, the refractory grains are bonded with silicate.

The magnesia-chrome bricks commonly referred to in China generally refer to fired ordinary magnesia-chrome bricks, also known as silicate-bonded magnesia-chrome bricks, or magnesia-chrome bricks for short.

Ordinary magnesia-chrome bricks have simple production process and low price, and are widely used in cement rotary kilns (Cr2O3 mass fraction rarely exceeds 14%), glass kiln regenerators, steelmaking furnace linings, permanent layers of refining ladles, nonferrous metallurgical furnaces, Lime kiln, mixed iron furnace and refractory high temperature kiln lining, etc.

Directly combined with magnesia-chrome bricks:

The main difference between the production process of directly combined magnesia-chrome bricks and ordinary magnesia-chrome bricks is that the former uses raw materials with less impurity content and is fired at a relatively high temperature.

For the production of magnesia directly combined with magnesia-chrome bricks, the mass fraction of MgO is generally greater than 95%, preferably greater than 97%, the particle volume density is about 3.25g/cm3, and the mass fraction of SiO2 in chrome ore is generally limited to below 3%. When using chrome concentrate, the SiO2 mass fraction can be lower than 1.0%.

According to different needs and uses, sometimes 1–2 kinds of magnesia and 1–2 kinds of chrome ore can be used for batching.

The cement kiln is directly bonded with magnesia-chrome bricks, generally magnesia is used as fine powder and part of the granular material, and chrome ore is used as the granular material, and the mass fraction of Cr2O3 is 3% to 14%;

The directly bonded magnesia-chrome brick used as a metallurgical furnace lining sometimes requires a Cr2O3 mass fraction as high as possible (such as 20%). When the purer magnesia and chrome ore co-ground fine powder are used as the matrix, the product often expands when fired.

Directly bonded magnesia-chrome bricks generally refer to products made of chrome ore with low impurity content and relatively pure magnesia, fired at a temperature above 1700 ° C, and the refractory grains are mostly in direct contact.

In the chemical composition of directly bonded magnesia-chrome bricks, there are few impurity components, and the direct bonding rate between refractory grains is high, so the slag resistance and high temperature performance are good.

Electrofusion recombination (semi-recombination) magnesia-chrome brick:

Usually people call the magnesia-chrome brick made of fused magnesia-chrome sand a rebonded magnesia-chrome brick, and the products that add part of fused magnesia-chrome sand are called semi-rebonded magnesia-chrome bricks.

Starting from the characteristic of direct combination of high-temperature crystal phase in microstructure, rebonded and semi-rebonded magnesia-chrome bricks are direct bonded bricks with higher direct bonding rate.

Due to the direct combination of magnesia-chrome bricks, recombined (semi-recombined) magnesia-chrome bricks have the characteristics of low impurity content and high-temperature (ultra-high temperature) firing, and these products are also called high-temperature fired (ultra-high temperature fired) magnesia-chrome bricks. brick.

The use of synthetic magnesia-chrome sand is the technological basis for the production of recombined and semi-recombined magnesia-chrome bricks.

Direct bonding and secondary spinelization are the theoretical basis for the production process of magnesia-chromium refractories.

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Zhenjin refractory products - magnesia chrome brick

Introduction of magnesia chrome brick: Magnesia-chrome bricks are refractory products with MgO and Cr2O3 as the main components, and periclase and spinel as the main mineral components. The main raw materials for manufacturing magnesia-chrome bricks are sintered magnesia and chromite. The purity of magnesia raw materials should be as high as possible. The chemical composition requirements of chromite are: Cr2O3: 30-45%, CaO: ≤1.0-1.5%. Zhengzhou Zhenjin Refractories Co., Ltd. is a manufacturing enterprise integrating R&D, production, sales and technical services. We are committed to the supply, construction and installation of refractory products in the cement, glass, building materials, non-ferrous smelting and metallurgical industries. .

Magnesia chrome brick features:

Magnesia-chrome bricks have high refractoriness and high temperature resistance

Strong resistance to alkaline slag erosion and excellent thermal shock stability

The production process of real gold magnesia chrome brick is simple and the service life is long

Magnesia chrome brick use: Magnesia-chrome bricks are mainly used in the cement industry and metallurgical industry, such as building open hearth furnace roofs, electric furnace roofs, refining furnaces outside furnaces and various non-ferrous metal smelting furnaces. The high-temperature part of the high-power electric furnace wall is widely used in fused cast magnesia-chrome bricks, the high-erosion area of the refining furnace outside the furnace is widely used in the high-erosion area made of synthetic materials, and the non-ferrous metal flash smelting furnace is widely used in high-erosion areas. Magnesia-chrome bricks made of materials. In addition, magnesia-chrome bricks are also widely used in the firing zone of cement rotary kiln and the regenerator of glass kiln.

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Refractory Suppliers, Refractory Company, Refractory

Refractory Suppliers, Refractory Company, Refractory

refractory materials manufacturers

Refractory Suppliers, Refractory Company, Refractory Yingkou Ruizhi Refractories Co., Ltd. is a China refractory materials manufacturers for high temperature melting furnaces. Ruizhi Refractories supply main products are: magnesia carbon brick, ramming mass, refractory brick, refractory castable, refractory nozzle, furnace lining material for converter, electric…

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Magnesia chrome brick

Magnesia chrome brick

Magnesia chrome brick Magnesia chrome brick is made of some preliminary synthesis high purity raw materials. The high purity raw refractories should be high pressure formed, ultra high temperature fired and then go through some other post-treatment process and system, finally made the magnesite chrome brick. Magnesia chrome brick has high room temperature compressive…

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The properties of magnesia calcium brick in AOD furnace

Magnesium calcium brick, also known as high calcium magnesia brick. Is a magnesium refractory. Low porosity. Load softening temperature is generally higher than 1700 ℃, alkali-resistant slag performance is good. Made from calcium and magnesium sand, by grinding. Ingredients, kneading, molding, in the 1550-1600 ℃ high temperature firing. Magnesium calcium refractory brick is mainly used for smelting stainless steel AOD furnace lining and VOD ladle lining, instead of the original magnesium chrome brick, is the most important magnesium calcium refractory. Features: 1.Optimize the formulation to control the quality of the product by controlling the mixing time of the raw material of Mg-Ca. 2.Products through the hydraulic press molding, can ensure that the brick pressure uniform; 3.The use of advanced tunnel kiln firing process, can guarantee product quality; 4.Magnesium calcium firebrick easy to hydrate, must be waterproof; 5.Part of the magnesium calcium brick after finishing the size of strict control.                  

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