#magnesia bricks

　　Xinmi, Henan, China is a gathering place for refractory materials. There are many manufacturers of refractory materials. Different manufacturers specialize in different fields. Regarding the manufacturers of refractory materials used in the cement industry, I recommend one to everyone - Zhengzhou Zhenjin Refractory Materials Co., Ltd.

　　Zhengzhou Zhenjin Refractory Materials Co., Ltd. has developed a series of high-end refractory materials for the cement industry to meet the needs of various refractory materials in the cement industry.

　　In addition, Zhenjin Refractory is the drafting unit for the new dry-process cement kiln magnesia iron spinel bricks and composite structure silica-molybdenum brick standards in China's refractory industry. The company has been awarded as a national "High-tech Enterprise", "Ministry of Industry and Information Technology Access Announcement Enterprise", and "Environmental Assessment Performance Compliance Level A" enterprise for 15 consecutive years; it has continuously passed ISO19001 quality management system, ISO24001 environmental management system and ISO45001 occupational health and safety management system certification.

　　The following lists 10 cement customer cases of Zhengzhou Zhenjin Refractory Materials Co., Ltd. and real customer feedback information. I hope it will be of reference value to you.

　　1. Zhangye Shandan Tieqi Cement Co., Ltd. 2500t/d cement line project

　　The overall quality of the products of Zhengzhou Zhenjin Company is excellent, and the safe operation and service life exceeds expectations. After the kiln was stopped, the overall bricks were inspected and the wear was not significant. The products of Zhengzhou Zhenjin Company are of high quality and are trustworthy refractory products.

　　2. Huaxin Cement (Huangshi) Co., Ltd. 10,000t/d cement line project

　　Zhengzhou Zhenjin's refractory brick products have good quality, regular appearance, good wear resistance and high cost performance. Their overall quality can completely replace imported products.

　　3. Ningxia Jinyuyuan Resource Recycling Co., Ltd.

　　Through the actual use of Zhengzhou Zhenjin Company's products, the raw materials used in the products have high purity, stable high-temperature performance indicators, high wear resistance, erosion resistance, and thermal shock stability. There is no erosion caused by spalling in the entire kiln system. Zhengzhou Zhenjin Company Jin Company's silicon-molybdenum wear-resistant bricks can meet our actual production needs, and our company's clinker production has achieved good economic benefits.

　　4. Zhejiang Haolong Building Materials Co., Ltd. 5000t/d cement line project

　　After our company uses the products of Zhengzhou Zhenjin Company, they have a long service life and good wear resistance, which have been highly praised by the company. We will continue to cooperate with Zhengzhou Zhenjin Company.

　　5. Chengde BBMG Cement Co., Ltd.

　　Zhengzhou Zhenjin Company's product quality and service are in good condition, with timely arrival and complete varieties. The engineering and technical personnel are serious and responsible. We are very satisfied with the overall service.

　　6. Dalian Tianrui Cement Co., Ltd. 5000t/d cement line project

　　The products of Zhengzhou Zhenjin Company comply with the relevant national technical requirements and meet the construction requirements well. The technical service attitude is good and can be adjusted in time according to the on-site construction conditions, which fully reflects the brand spirit of the company's products - real gold is not afraid of fire.

　　7. Linyi Zhonglian Cement Co., Ltd. 5000t/d cement line project

　　The company's 5000t/d production line uses Zhenjin Company's products. The company provides timely delivery and sends engineering and technical personnel to guide the masonry construction on site. The whole process is considerate and has received unanimous praise from our company. Because it saves time during the masonry construction, it ensures a smooth construction period. The completion provided good conditions, for which we are grateful.

　　8. Fujian Honghuo Cement Co., Ltd. 5000t/d cement line project

　　The products of Zhenjin Company are of good quality and service, and are deeply trusted by our company's leaders and employees. We will always choose the refractory materials products produced by Zhenjin Company and look forward to our long-term cooperation!

　　9. Anhui Wuhu Conch Cement Co., Ltd. 5000t/d cement line project

　　The overall quality of Zhenjin Company's products is excellent, and the service life can reach the expected time. After the kiln is stopped, the bricks are inspected after the kiln is stopped. The wear of the bricks is not great. Zhenjin Company's products are trustworthy refractory products.

　　10. Oriental Hope Chongqing Cement Co., Ltd. 5000t/d cement line project

Magnesia brick is a common refractory material consisting of magnesia and other additives. It has the following properties and uses:

Good high temperature performance: Magnesia bricks have excellent high temperature stability and fire resistance. It can maintain structural stability for a long time at extremely high temperatures, and exhibits a low coefficient of expansion and excellent thermal shock resistance.

Anti-corrosion performance: Magnesia bricks have high resistance to the erosion of acid, alkali and other chemical substances. This makes it widely used in corrosive environments in chemical, metallurgical and other fields.

Lightweight and high strength: Compared with traditional silicate bricks, magnesia bricks have lighter weight and higher strength. This makes it favored in applications where structural load relief is required or higher strength is required.

Good heat insulation performance: Since magnesia bricks have low thermal conductivity, it can provide good heat insulation performance, effectively reduce heat energy loss and save energy. Therefore, it is widely used in the heat insulation layer of kilns, furnaces and other high-temperature equipment.

Wide range of applications: Magnesia bricks are widely used in metallurgy, chemical industry, building materials, glass, ceramics and other industries. It is often used in the construction and protection of high-temperature equipment such as furnace lining, kiln insulation layer, refractory kiln wall, and glass kiln tunnel.

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

What is a Magnesia brick?Magnesia brick is a refractory material mainly composed of magnesium oxide, which has the following uses:

1. Furnace lining: Magnesia bricks are widely used as lining materials for various industrial furnaces. Because magnesia bricks have excellent refractory performance and high temperature stability, and can withstand erosion and impact at extremely high temperatures, they are very suitable as protective materials for the inner wall of the furnace.

2. Starting plates and roofs: Magnesia bricks can also be used in the construction of starting plates and roofs. In the steelmaking and metallurgical industry, the high refractory performance and corrosion resistance of magnesia bricks make it an ideal material choice for the manufacture of starting plates and furnace roofs of blast furnaces, electric arc furnaces, converters and other equipment.

3. Glass kiln: Because magnesia bricks are less corrosive to glass melt and have good thermal conductivity and heat resistance, magnesia bricks are widely used in the inner lining and heat insulation layer of glass kilns. It can withstand thermal stress and thermal expansion under high temperature conditions, protect the kiln structure stability and provide good heat insulation effect.

4. Ladles, converters, electric arc furnaces: In the iron and steel industry, magnesia bricks are widely used in the lining of smelting equipment such as ladles, converters and electric arc furnaces. Magnesia bricks can withstand high temperature and erosion, and have good thermal conductivity and thermal expansion properties, suitable for environments that withstand high temperatures and chemical reactions during the smelting process.

5. Chemical equipment: Due to its excellent acid and alkali resistance, magnesia bricks are widely used in acid and alkali resistant linings and reactor linings in chemical equipment. It can resist the erosion and corrosion of chemical substances and ensure the stable operation of the device.

 Magnesia chrome brick is a high-quality refractory material composed of magnesium oxide (MgO) and chromium trioxide (Cr2O3). It has excellent performance in high temperature environment and is widely used in many fields. The following are the main uses of magnesia chrome bricks:

1、Metallurgical industry: Magnesia-chrome bricks are widely used in high-temperature equipment in the metallurgical industry, such as steel converters, electric furnaces, and smelting furnaces. They can be used in areas such as linings, furnace floors, furnace walls and furnace roofs to provide refractory protection and withstand erosion and wear under high temperature conditions.

2、Chlor-alkali industry: Equipment such as electrolyzers and evaporators in the production process of the chlor-alkali industry need materials that can withstand high temperatures and corrosion. Magnesia-chrome bricks are widely used in these equipment, providing excellent fire resistance and corrosion resistance, ensuring long-term stable operation of the equipment.

3、Oil refining and chemical industry: In the oil refining and chemical industry, magnesia-chrome bricks are often used in high-temperature equipment such as catalytic cracking units, hydrogenation units, reforming units and furnaces. They withstand high temperatures, corrosive gases and chemicals and provide reliable fire protection.

4、Glass industry: Glass furnaces are the core equipment in the glass industry, which are required to withstand extremely high temperatures and chemical erosion. Magnesia-chrome bricks are widely used in the inner lining, cooling zone and melting area of glass furnaces to maintain stable refractory performance and long service life.

5、Power industry: In the power industry, magnesia-chrome bricks are often used in high-temperature equipment such as boilers, burners, chimneys and hot blast stoves. They can withstand high temperature and flue gas erosion, and provide effective fire protection to ensure the normal operation and safety performance of equipment.

6、Other industries: In addition, magnesia-chrome bricks are also widely used in cement kilns, ceramic kilns, welding furnaces, carbonization furnaces, aluminum electrolytic cells and other fields. Its excellent fire resistance and corrosion resistance make it an important high temperature refractory material.

In conclusion, magnesia chrome bricks are widely used in several industries due to their high temperature resistance, erosion resistance and mechanical strength. Whether it is metallurgy, chlor-alkali, oil refining and chemical industry, glass or electric power and other fields, magnesia-chrome bricks can provide reliable fire-resistant protection to ensure long-term stable operation of equipment.

 Magnesia chrome brick is a high-quality refractory material composed of magnesium oxide (MgO) and chromium trioxide (Cr2O3). It has excellent performance in high temperature environment and is widely used in many fields. The following are the main uses of magnesia chrome bricks:

1、Metallurgical industry: Magnesia-chrome bricks are widely used in high-temperature equipment in the metallurgical industry, such as steel converters, electric furnaces, and smelting furnaces. They can be used in areas such as linings, furnace floors, furnace walls and furnace roofs to provide refractory protection and withstand erosion and wear under high temperature conditions.

2、Chlor-alkali industry: Equipment such as electrolyzers and evaporators in the production process of the chlor-alkali industry need materials that can withstand high temperatures and corrosion. Magnesia-chrome bricks are widely used in these equipment, providing excellent fire resistance and corrosion resistance, ensuring long-term stable operation of the equipment.

3、Oil refining and chemical industry: In the oil refining and chemical industry, magnesia-chrome bricks are often used in high-temperature equipment such as catalytic cracking units, hydrogenation units, reforming units and furnaces. They withstand high temperatures, corrosive gases and chemicals and provide reliable fire protection.

4、Glass industry: Glass furnaces are the core equipment in the glass industry, which are required to withstand extremely high temperatures and chemical erosion. Magnesia-chrome bricks are widely used in the inner lining, cooling zone and melting area of glass furnaces to maintain stable refractory performance and long service life.

5、Power industry: In the power industry, magnesia-chrome bricks are often used in high-temperature equipment such as boilers, burners, chimneys and hot blast stoves. They can withstand high temperature and flue gas erosion, and provide effective fire protection to ensure the normal operation and safety performance of equipment.

6、Other industries: In addition, magnesia-chrome bricks are also widely used in cement kilns, ceramic kilns, welding furnaces, carbonization furnaces, aluminum electrolytic cells and other fields. Its excellent fire resistance and corrosion resistance make it an important high temperature refractory material.

In conclusion, magnesia chrome bricks are widely used in several industries due to their high temperature resistance, erosion resistance and mechanical strength. Whether it is metallurgy, chlor-alkali, oil refining and chemical industry, glass or electric power and other fields, magnesia-chrome bricks can provide reliable fire-resistant protection to ensure long-term stable operation of equipment.

The main component of magnesia bricks is magnesia, and the main crystal is periclase, which accounts for 80%-90% of the mass of magnesia bricks. Its matrix compounds are magnesium ferrite, magnesium aluminum spinel, forsterite, calcium forsterite, etc.

一. Properties of magnesia bricks

Since the main crystal of magnesia brick is strongly alkaline periclase, it has high density, low water content, high molding pressure, low apparent porosity and high volume density. Therefore, magnesia bricks have the characteristics of multi-mineral composition, strong alkalinity and high density.

Magnesia brick is a typical alkaline refractory material, which has a strong ability to resist alkaline slag erosion.

The melting point of periclase is as high as 2800°C, so the refractoriness of magnesia bricks is also very high, generally above 2000°C.

The load softening temperature of magnesia bricks is much lower than the refractoriness, about 1500 ℃.

The thermal conductivity of magnesia bricks is good, but the thermal conductivity decreases significantly with the increase of temperature, that is, magnesia bricks have good thermal conductivity and low thermal insulation.

The thermal expansion of magnesia bricks is relatively large, and the linear expansion coefficient increases with the increase of temperature. The thermal shock stability of magnesia bricks is poor, and the number of water cooling is only 2-3 times.

二. the use of magnesia bricks