#Ladle Magnesia Carbon Brick Ladle MgO-C Bricks Ladle Lining Brick

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How to make magnesia carbon brick

The article describes in detail the process of how to make magnesium carbon bricks. What’s more, the article also expresses some other issues related to magnesia carbon bricks. Weclcome to visit our factory to see magnesium carbon brick product process.

Magnesia carbon brick Production process

The steps in the production process of MgO-C bricks are described here. First, the refractory raw materials are graded into coarse, medium, and fine sizes and are classified as necessary.  Next, they are mixed and kneaded with a binder in pre-determined blend proportions by parti­cle size. The kneaded mixture is press formed into bricks.

By a magnesia-carbon brick there is understood a brick based mainly on the components burned magnesite, carbon in the amount of typically 5-30% carbon by weight and a suitable binder. Magnesia-carbon bricks are used in the wear lining of a converter for steel production, and are substantially more resistant to wear than magnesite bricks in which the percentage of carbon used is not so high. The wear lining of a converter can, depending on the price of the bricks, be wholly or partly constructed from magnesia-carbon bricks, especially at the location of the trunnions of the converter, where the wear is greatest.

Magnesia Carbon Brick for sale

Production process for MgO-C bricks

Uniaxial forming with an oil press or a friction press is normally used as the pressing equipment. The magnesia aggregate and graphite in MgO-C bricks show orientability depending on the forming di­rection of the press. The strength and thermal conductivity of MgO-C bricks show anisotropy . It is hence important to consider the forming direction of bricks when laying the bricks. A cold isostatic press (CIP) with small anisotropy is also used for the production of large refractory products such as bottom blowing tuyere bricks and taphole bricks.

Formed bricks are dried to remove moisture and other volatile components, processed, and coated as needed, visually inspected for cracks, chips, and other defects, and dispatched after removing defective bricks.

MgO-C (magnesia-carbon) refractories are widely used in several steelmaking linings. These refractories are exposed to extreme stress due to high temperatures (T > 1600 °C) required to cause the metallurgical reactions. These working conditions produced refractory wear through various related processes. The different types of degradation that the material suffers can be from thermochemical or thermomechanical origin.

Method for the manufacture of a magnesia-carbon brick, comprising the steps of:

a. preparing a mixture comprising:

1. burned magnesite

2. carbon

3. a binder solution comprising:

3.1 pre-condensed novolak resin

3.2 a solvent for this novolak resin.

4. a hardener for the resin.

b. pressing a brick from the mixture.

The method also provides bricks produced by the method and a converter having a wear lining consisting at least partly of such bricks.

FAQ:

How are magnesia carbon bricks made?

The traditional magnesia carbon brick manufactured by the synthetic tar binder in the cold mixing process is hardened during the process of tar damage and the necessary strength is obtained, thus forming isotropic glassy carbon.

What is the use of magnesia carbon bricks?

MgO-C (magnesia-carbon) refractory bricks are widely used in steel industry, the primary consumer of refractory linings, such as basic oxygen furnaces, electric arc furnaces, and ladle furnaces.

What is the raw material for magnesia carbon bricks?

Sea water magnesia is mainly used in SAIL as the main raw material for manufacturing of magnesia carbon bricks.

What is magnesia carbon brick?

Magnesia-Carbon brick is resin-bonded brick made from dead-burned or fused magnesia and graphite. Anti-oxidant is added if required. Our control over bonding agents mean that these products are classed as eco friendly in terms of steel production.

In conclusion, Welcome to learn how to make magnesia carbon bricks and learn other information about magnesia carbon bricks. If you are interested in other refractory products and production processes, please feel free to browse our website or visit our factory.

Article Source:How to make magnesia carbon brick Company name: Henan Changxing Refractory Materials Co.,Ltd More refractory products:https://www.cxrefractories.com/en-all-refractory-products Email:info@cxrefractories.com Website:https://www.cxrefractories.com

Magnesia Carbon Bricks

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Application of MgO-C bricks in ladle

Currently, inhibition of steel temperature droping has become a major issue for many steel plants. Therefore, in order to suppress temperature drop of molten steel, there has a test to study insulation problem of refractory lining in 185t ladle, by comparing three different measures. First: Reducing the heat transfer effect of sidewall castables (30% reduction). This method is by reducing coarse particles in refractory castable, increasing porosity and other measures to reduce the thermal conductivity, to suppress heat dissipation. Second: Using insulation materials in the backlayer of wall castable. This method is to use one layer insulating bricks with less than 1W (m℃) thermal conductivity between ladle steel shell and wall castable, to inhibit heat dissipationheat. Thrid: Reducing the heat transfer of slag line MgO-C brick heat transfer (30% reduction). This method is developed in recent years, to select lower thermal conductivity of MgO-C brick from the high thermal conductivity of magnesia carbon brick for slag line, to suppress heat dissipation. After comparing, the results found that: only in reducing the thermal conductivity of slag line magnesia carbon bricks , the effect of suppressing steel temperature dropping is significant, up to 2℃. The durability is same or higher than ordinary ladle, less cracks, the residual condition after use is also very good. Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products. Article Source：Application of MgO-C bricks in ladle Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Magnesia Carbon Brick

Magnesia Carbon Brick Changxing Refractory is able to manufacture magnesia carbon brick for every ladle, EAF, and BOF. We will design you a well-balanced lining, providing optimal performance at the lowest possible cost. Our MgO-C bricks is made from more than 98% electrically fused magnesite, high purity graphite and metallic antioxidants as needed. Size and specification can be tailored…

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The use of aluminum-magnesium-carbon bricks on LRF

When MgO-C bricks are used for refining ladle furnaces and ladles, they are mainly used in headroom and slag lines. According to the operating conditions, the refractory materials used in these parts must have high temperature resistance, thermal shock resistance, and resistance to mechanical corrosion caused by slag erosion.

So in the past, these parts used magnesia-chromium refractory materials, but considering that chromium pollutes the environment, its consumption has been reduced, and now magnesia-carbon bricks are used.

Since the magnesia-carbon bricks in the new ladle will be severely damaged during the preheating process, the loose decarburized layer can reach 30-60mm thick. This layer is washed away during the injection of molten steel, bringing the magnesia grains into the slag.

Obviously, preventing the carbon in the magnesia carbon bricks from being burned out during preheating is one of the important steps to improve the service life of the magnesia carbon bricks at the ladle clearance and slag line.?

Its technical measures, in addition to compounding the composite antioxidant into the magnesia carbon brick, the key is to cover the surface of the magnesia carbon brick with an alkali-containing low-melting glass phase liquid after lining, so as to protect the ladle magnesia carbon brick. Carbon is not burned off during the preheating process of the ladle.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality ladle magnesia carbon bricks are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:The use of aluminum-magnesium-carbon bricks on LRF Company name: Henan Changxing Refractory Materials Co.,Ltd More refractory products:https://www.cxrefractories.com/en-product-solution Email:info@cxrefractories.com Website:https://www.cxrefractories.com

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Analysis on the causes of over-erosion of bricks in refined ladle slag line

Analysis on the causes of over-erosion of bricks in refined ladle slag line

Analysis on the causes of over-erosion of bricks in refined ladle slag line We analyze the erosion mechanism of magnesia carbon bricks from the aspects of slag, carbon content and carbon structure in magnesia-carbon bricks, raw materials of magnesia-carbon bricks, and additives in MgO-C Brick, and get the erosion of magnesia-carbon bricks. The damage process mainly includes the following:…

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Analysis on the causes of over-erosion of bricks in refined ladle slag line

Analysis on the causes of over-erosion of bricks in refined ladle slag line

We analyze the erosion mechanism of magnesia carbon bricks from the aspects of slag, carbon content and carbon structure in magnesia-carbon bricks, raw materials of magnesia-carbon bricks, and additives in MgO-C Brick, and get the erosion of magnesia-carbon bricks. The damage process mainly includes the following: oxidation-decarburization-porosity-erosion-erosion-shedding-damage. In this…

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Wear mechanism of main refractory materials for ladle slag line

Wear mechanism of main refractory materials for ladle slag line

Measures to solve the problems of tundish refractory

The destruction of the slag line is the most common reason why the ladle cannot be used and needs to be repaired or re-lined. Generally speaking, the operating conditions of the ladle are somewhat similar to that of the converter, but worse than its conditions, mainly due to the larger oxidation and temperature fluctuation range. Carbon oxidation and slag erosion are the two most important causes of damage to the ladle?magnesia carbon brick lining during use. In fact, these two factors interact very strongly, and it is sometimes difficult to say which one is more harmful than other. The wear mechanism of magnesia-carbon lining includes two aspects: one is the melting loss of magnesia particles by slag, such as SiO2, CaO and other oxides and MgO form low-soluble matter, which is caused by the slag. The second is that FeO in the slag oxidizes the C in the magnesia carbon brick, causing the brick structure to become loose. In addition, during the refining process of molten steel, argon blowing and stirring are carried out, and the molten steel and steel slag are mechanically washed, which intensifies the damage of the slag line. In addition to chemical attack, physical factors, such as vertical cracks and brick joints, often cause slag erosion, resulting in early damage to the slag line and limiting its service life.

Article Source:Wear mechanism of main refractory materials for ladle slag line Company name: Henan Changxing Refractory Materials Co.,Ltd More refractory products: https://www.cxrefractories.com/en-product-solution Email:info@cxrefractories.com Website:https://www.cxrefractories.com

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Seamless ladle lining can reduce the unit consumption of refractory materials by 50%

Magnesia carbon brick (MgO-C) has been used for many years as a refractory lining for ladle. In the 1980s, Japan developed a magnesia-aluminum spinel castable amorphous lining containing prefabricated spinel for use in ladle. In the 1990s, an in-situ spinel composition was formed in the second generation lining with fine magnesia and activated alumina added to the matrix. Different spinel castables are used in different ladle areas. At the bottom of the ladle, especially the ladle purging plug and wall bricks, the volume stability under high temperature and high pressure is the most important. High corrosion resistance and thermal shock resistance are also important in the process of high-speed molten steel production and when blowing in low-temperature stirring gas. Castables containing prefabricated spinel have become the standard for this application and provide optimal performance. The requirements for the side wall of the ladle vary. Since each steel cladding shell has some deformation after transportation, storage and processing, and because the inner lining is not absolutely rigid, one of the advantages is that stress relaxation can be used to avoid stress peaks causing cracks. Adding silicon powder to the castable formed by spinel to form a liquid phase will cause the castable to soften (a sharp drop in the RUL curve) to release thermal stress. The volume expansion caused by the in-situ spinel formation can close the seams on the surface. Therefore, the castable formed by spinel brings some advantages to the side wall of the ladle. This article believes that the combination of spinel and spinel is the best solution. This article provides a quick review of the ladle unshaped lining and innovative installation technology.

Advantages of unshaped lining for ladle:

(1) The replacement of magnesia carbon bricks with amorphous linings at the bottom and side walls of the ladle brings many advantages to the steelmaking process, mainly as follows: (1) The use time of ladle is extended; (2) The total number of ladle operations is reduced by 20%; (3) Compared with MgO-C bricks containing toxic and carcinogenic substances (phenolic resin, coal tar pitch, etc.), the castable does not have any harmful materials; (4) Reduce the unit cost of steel production; (5) Produce ultra-low carbon steel in a better operating environment, because there is no carbon increase in the ladle refractories; (6) The unit consumption of refractory materials is reduced by more than 50%. Compared with other amorphous linings, the last advantage is the most important. Technically, the unit consumption of refractory materials is reduced by more than 50%, which is based on the concept of seamless lining. When magnesia-carbon bricks are used as the lining of the ladle and the service life of the bricks is reached, it will be replaced by a new set of MgO-C bricks. However, for amorphous linings, the situation is completely different. In the first installation, the amount of castable is the same as that of bricks. Subsequent replacement of the lining at the bottom and side walls, if brick lining is used, all need to be replaced. If unshaped refractory is used, only the part of the lining (about 40% to 60%) in contact with molten steel needs to be replaced, and the undamaged the lining will remain in place. Until the end of the ladle operation and before the complete renewal of all the inner?linings of the ladle, including the necessary safe working layer, refractory materials can be saved by using the unshaped inner lining.

Article Source:Seamless ladle lining can reduce the unit consumption of refractory materials by 50% Company name: Henan Changxing Refractory Materials Co.,Ltd More refractory products: https://www.cxrefractories.com/en-product-solution Email:info@cxrefractories.com Website:https://www.cxrefractories.com

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Development of ladle lining refractory materials

20th Century 50--70 years, China's steel plants mainly used aluminosilicate refractory materials, including clay, high alumina brick and so on. Since the 1980s, China has successively developed the aluminum-magnesium carbon, coal quality calcium and magnesium and other several series of new steel package refractories. Wherein the aluminum-magnesium carbon refractory materials are of varieties, all specifications, is China's major ladle refractories.

In earliest 20th Century 50--60 years, a variety of clay bricks were mainly used in our country. Due to low cost, until the 1980s, some steel plants were using clay bricks as ladle lining material. Although clay bricks is no longer used as ladle material so far, it had made a great countribution for recovery and future development of China's steel industry in the early days.

With the continuous development of steelmaking technology, steel quatity and quantity, clay bricks was no longer used because of short service life. Some of our mills started using a variety of high alumina bricks as ladle lining material, in which way the ladle life got a greatly improvement.

With the continuous improvement of steelmaking technology, high aluminum ramming mass, wax brick, alumina magnesia, aluminum-magnesium casting material, aluminum-magnesium unfired brick, aluminum-magnesium spinel castable, aluminum MgO-C, magnesium aluminate spinel brick, aluminum-magnesium unfired brick and a series of high-grade refractory materials appeared to adapt to higher demand.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Development of ladle lining refractory materials Company name:?Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

[xinmichangxingrefractory-blog]

Development of ladle lining refractory materials

20th Century 50--70 years, China's steel plants mainly used aluminosilicate refractory materials, including clay, alumina brick and so on. Since the 1980s, China has successively developed the aluminum-magnesium carbon, coal quality calcium and magnesium and other several series of new steel package refractories. Wherein the aluminum-magnesium carbon refractory materials are of varieties, all specifications, is China's major ladle refractories.

In earliest 20th Century 50--60 years, a variety of clay bricks were mainly used in our country. Due to low cost, until the 1980s, some steel plants were using clay bricks as ladle lining material. Although clay brick is no longer used as ladle material so far, it had made a great countribution for recovery and future development of China's steel industry in the early days.

With the continuous development of steelmaking technology, steel quatity and quantity, clay bricks was no longer used because of short service life. Some of our mills started using a variety of high alumina bricks as ladle lining material, in which way the ladle life got a greatly improvement.

With the continuous improvement of steelmaking technology, high aluminum ramming mass, wax brick, alumina magnesia, aluminum-magnesium casting material, aluminum-magnesium unfired brick, aluminum-magnesium spinel castable, aluminum MgO-C, magnesium aluminate spinel brick, aluminum-magnesium unfired brick and a series of high-grade refractory materials appeared to adapt to higher demand.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory?products.

Article Source:Development of ladle lining refractory materials Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Application of low thermal conductivity MgO-C bricks in ladle

Currently, inhibition of steel temperature droping has become a major issue for many steel plants. Therefore, in order to suppress temperature drop of molten steel, there has a test to study insulation problem of refractory material lining in 185t ladle, by comparing three different measures.

Measure 1: Reducing the heat transfer effect of sidewall castables (30% reduction).

This method is by reducing coarse particles in castable, increasing porosity and other measures to reduce the thermal conductivity, to suppress heat dissipation.

Measure 2: Using insulation materials in the backlayer of wall castable. This method is to use one layer insulating refractory bricks with less than 1W (m celsius) thermal conductivity between ladle steel shell and wall castable, to inhibit heat dissipationheat.

Measure 3: Reducing the heat transfer of slag line magnesia carbon brick heat transfer (30% reduction).

This method is developed in recent years, to select lower thermal conductivity of magnesite carbon bricks from the high thermal conductivity of MgO-C brick for slag line, to suppress heat dissipation.

After comparing, the results found that: only in reducing the thermal conductivity of slag line MgO-C brick , the effect of suppressing steel temperature dropping is significant, up to 2 Celsius. The durability is same or higher than ordinary ladle, less cracks, the residual condition after use is also very good.

Article source:

http://www.yilongrefractory.com/news/Application%20of%20low%20thermal%20conductivity%20MgO-C%20bricks%20in%20ladle.html

E-mail:sales8@chinaelong.com

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The performance and main use of magnesia carbon brick

Magnesia carbon brick made of high purity refractories Supplier  magnesia, high quality graphite and some additives. Its performance and brick graphite content has a great relationship. With the increase of the graphite content, the strength of the refractory brick decreases, the coefficient of thermal expansion decreases and the residual expansion rate increases.

So should control the graphite content of brick in about 20%. MgO-C bricks on the slag wetting, with excellent resistance to peeling, corrosion resistance, suitable for ladle slag line parts, especially the occasion of multi-furnace even pouring. In order to meet the needs of the production of clean steel, refined in the ladle, the application of magnesia carbon refractory bricks parts from the slag line to the side of the wall to expand.

Refractory material magnesia carbon refractory brick is mainly used for steel-making oxidation converter furnace lining, tapping port, high-power electric furnace wall hot spot parts, as well as furnace refining furnace lining, Sheng Gangzai slag line parts.

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Talking about the four technological factors influencing the performance of magnesia carbon brick

Abstract: magnesia carbon bricks is a high melting point of basic oxide oxide (melting point 2800 ℃) and difficult to be slag invasion of high melting point carbon material as raw material, add a variety of non-oxide additives. With carbonaceous binder combination of non-burning carbon composite refractory. magnesia carbon refractory bricks is mainly used for converter, AC arc furnace, DC arc furnace lining, ladle slag line and other parts. magnesia carbon bricks is a high melting point of basic oxide oxide (melting point 2800 ℃) and difficult to be slag invasion of high melting point carbon material as raw material, add a variety of non-oxide additives. With carbonaceous binder combination of non-burning carbon composite refractory. magnesia carbon brick is mainly used for converter, AC arc furnace, DC arc furnace lining, ladle slag line and other parts.

The impact of magnesia carbon brick performance factors are raw materials, binders, additives and so on.

1, magnesia

Abroad, the initial production of magnesia carbon brick is used in high purity sintered magnesia, with the use of magnesia carbon brick in-depth study found that the following reaction at high temperatures:

MgO + C → Mg ↑ + CO ↑. This reaction is generally started at 1650 ℃, to 1750 ℃ ??when the reaction intensified, which is the use of magnesia carbon brick in the loss of one of the important reasons, but also magnesia carbon brick at 1700 ℃ above the use of significantly increased wear and tear reasons. The impurities in the magnesia SiO2, Fe2O3 and so on to promote the reaction of the above, therefore, hope that the magnesia has a higher purity.

Fused magnesia is relatively stable for the sintering of magnesia, the crystal structure is more complete, the reduction of carbon is also more stable, especially the large crystalline fused magnesia these characteristics are more prominent, so the production of magnesia carbon brick began to turn to use Fused magnesia. In consideration of the bonding state of the carbon and the wettability of the binder, it is also possible to use the fused magnesia sintered magnesia. china refractory materials magnesia carbon brick is basically the use of fused magnesia.

The use of magnesia carbon brick results show that the use of MgO content is high, the magnesite phase crystal particles, calcium and silicon ratio greater than 2 magnesite, the production of magnesia carbon brick the best.

2, graphite

Graphite is another basic component of refractories  magnesia carbon brick. Graphite has a very good basic properties of refractories, the main physical and chemical indicators: fixed carbon 85% to 98%, ash 13% to 2% (the main component of SiO2, Al2O3, etc.), the relative density of 2.09 ~ 2.23, melting point 3640K Volatile). Since graphite is very easy to be oxidized, it has not attracted much attention for a long time.

magnesia carbon brick during the use of graphite oxidation for three reasons:

(1) oxygen oxidation of graphite in air;

(2) oxidation of the oxide in the slag;

(3) graphite itself contains impurities in the oxide oxidation of graphite. These oxides mainly refer to SiO2 and Fe2O3.

magnesia carbon brick in the impurity oxide and graphite reaction, resulting in loose brick structure, permeability increased, decreased strength, which is the destruction of magnesia carbon brick internal factors. Therefore, the production of magnesia carbon brick mostly use high purity, large pieces of phosphorescent crystals.

3, binding agent

Bonding agent for magnesia carbon brick and other carbon refractory products, the role is essential. There is no miscible relationship between graphite and refractory oxide, and it is impossible to sinter with each other. At room temperature, they rely on binder to cure. At high temperatures, the binder will be coking and carbonation, and graphite to form carbon, generally this binder refers to the resin, asphalt and other organic matter. The combination of high-temperature coking carbonization after the formation of about 3% of the carbon, which is small, but in the magnesia carbon brick or other carbon products is the most dynamic components of the high temperature performance of products have an important impact. China's magnesia carbon brick or other carbon products production process and product quality is not stable enough, one of the important reasons is caused by the instability of the binder.

magnesia carbon brick binder can be divided into three types: phenolic resin, modified asphalt, petroleum cracking by-product category, which use the best results, the largest amount of phenolic resin.

4, add

In the process of destruction of magnesia carbon brick, graphite oxidation is one of the main reasons. Due to oxidation of carbon loss, resulting in loose brick structure, strength decreased. Damage process to follow the oxidation of carbon loss → loose structure → erosion → erosion of the road. In order to improve the oxidation resistance of magnesia carbon brick, you can add a certain amount of additives, including silicon powder, aluminum powder, FeSi alloy, CaSi alloy, SiC, Si3N4, B4C and so on. Another effect of the addition is to "bridge" between the refractory oxide and the graphite, so that the graphite and the refractory oxide form a strong bond, which is due to the fact that the additive forms a new mineral phase at a certain temperature.

China's production of magnesia carbon brick and other phosphorus-containing refractory products, the most commonly used additives are aluminum powder, silicon powder and SiC powder.

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Magnesia carbon brick Product Consumption Knowledge

Magnesia carbon brick is a kind of important refractory used in steelmaking converter, steel making electric furnace, steel refining furnace and its ladle as lining (lining). As the erosion resistance, not easy to slag, so the use of magnesia brick can significantly improve the life of steel-making furnace (bag). Magnesia carbon brick is the use of high-quality fused magnesia, high purity flake graphite, metal additives and other raw materials, phenolic resin as a binder by high-pressure molding, about 200 ℃ heat treatment made of a refractory products. High quality magnesia carbon refractory brick to ensure the service life and safety, the use of poor quality magnesia carbon brick masonry furnace easy to burn, the occurrence of running steel, leakage of steel, casualties and other vicious accidents, so the procurement must be good Quality off. The appearance of the black and white magnesia carbon bricks manufacturers products, the appearance of oil black shiny, cross-section neat; poor magnesia carbon refractory brick for sale product appearance rough white point, cross-section has a layer, resulting in particle segregation, and particles continue. Magnesia carbon brick physical and chemical indicators with the naked eye is difficult to judge, the user can randomly send the authority to send the department for quality inspection. GB / T 22589-2008 "magnesia carbon brick" requirements of the physical and chemical indicators are as follows: MgO content, C content, significantly porosity, bulk density, room temperature compressive strength, high temperature bending strength. mgo brick supplier is easy to hydrate, so the magnesia carbon brick must be kept in the rain, moisture-proof warehouse. Packaging and transportation should also take measures to prevent rain and moisture, the product once the damp, product quality will decline, serious will lead to magnesia carbon brick products scrapped.