Magnesia-calcium sand is a method of tempering and processing high-temperature refractory materials, especially the production process of high-purity magnesia, which is characterized by various furnace magnesia, and fused magnesia fur produced by furnaces and calcination methods above 600 ℃ Various grades of magnesia are used as raw materials, or surpassing any mixed materials. The above materials are divided into concentrates by grade and coarsely charged by the concentric ring method or the original materials (or their mixed materials) are used as concentrates. Magnesium ore is a coarse feed, and a species ratio is placed on it. It is loaded in a concentric method using existing fused magnesia or a plate furnace for tempering. It may exceed 96.5 purity than fused magnesia.
Reburned magnesia is a kind of refractory material. It uses magnesium oxide (magnesia) as the basic aggregate, which is mixed with magnesium chloride aqueous solution, and a small amount of talc, quartz sand, and glass wire are added to form knots. The refractoriness can reach 400 degrees Celsius, and the high energy can reach 1700 degrees. Die-burned magnesium, good sintering degree, uniform chemical composition and stable quality. It is mainly used for steelmaking open hearth furnace, electric furnace sintering bottom and ramming furnace lining.
The preparation of magnesia adopts the arc melting method, which uses the materials containing magnesium as the basic material (such as magnesite, brucite, light burned magnesia, heavy burned magnesia, etc.), and is passed in different types of electric melting furnaces. Arc heating generates high temperature (greater than 3000°C), which causes the magnesia material to be heated in the furnace, decarburized (when using magnesite), dehydrated (when using brucite), melting, crystallization, crystal growth, and cooling After a series of physical and chemical changes, fused magnesia with various physical properties is made. Through the processing of these crystals, it becomes electrolytic magnesium oxide suitable for various purposes.
Uses of re-burned magnesia: The product is used for magnesia bricks, magnesia alumina bricks, magnesia chrome bricks, gunning materials, castables, dry materials, spreads, repair materials, asphalt, casting, fire protection and heat preservation materials, flux accessories, Electrical steelmaking furnaces, heating furnaces, rotary furnaces, steelmaking, electric furnace bottoms and ramming furnace linings. Large crystalline fused magnesia products are mainly made of 0-3 magnesia particles with a content of 90 or more and melted in an electric arc furnace. The product has high purity, large crystal grains, compact structure, strong slag resistance, and good thermal shock stability. It is an excellent high-temperature electrical insulation material and an important material for the manufacture of magnesia bricks, magnesia carbon bricks and unshaped refractory materials. . It is widely used in metallurgy, chemical industry, national defense, scientific research, aerospace, household appliances, etc.
Product characteristics of large crystalline fused magnesia: high purity, large melting of crystal particles, high point structure, compact structure; good thermal shock stability; good high temperature flexural strength; good slag resistance and corrosion resistance; heat conduction Strong function and high insulation. Product use of large crystal fused magnesia: large crystal fused magnesia is used as refractory materials for the lining of steelmaking furnaces. It is an alkaline refractory material for making refractory bricks and unshaped refractory materials; it can also be used as a filler to make thermocouples. And thermal insulation materials (household appliances, etc.); can also be used for ceramic materials and sintering aids, as well as metallurgy, building materials, chemicals, national defense, medical equipment, etc.
The process method for producing fused magnesia is characterized by the fused magnesia fur produced by the furnace being used or various concentrated magnesia and magnesia roughage produced by the rotary kiln. In the furnace, the existing process technology is not a variable , As long as the partition is added to the furnace, the load is concentrated in the partition, the externally loaded coarse grain has a partition, and the high temperature resistant material partition used for the partition is about 50 mm in the furnace wall, which constitutes a separation layer of coarse grains and concentration , And then melt, add the data bit and still mention the partition plate, until the smelting furnace Weizhi, 96.5 purity can get more fused magnesia.
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