You grasp the application of corundum in refractory materials and the properties of corundum in refractory materialsdenitrification and desulfurization device spraying

       

Corundum has been widely used in refractory materials. Do you have some properties of corundum? Let's take a look at this content at this stage.

1. Higher strength and wear resistance



2. Corrosion resistance slag corrosion and water absorption: The main crystal phase of various corundum is a-Al2O3, which has very good corrosion resistance to slag corrosion and water absorption. The fly ash produced in the whole process of iron making is generally ph pH fly ash with high SiO2 composition and low CaO active ingredient. Al2O3-based refractories are widely used as linings for industrial ironmaking, such as high-alumina bricks for iron-making blast furnace bodies, Al2O3-SiC-C refractories (refractory castables and ramming materials) for tapholes, ladle and torpedo boats Tank tap mud (Al2O3-SiO2-SiC-C refractories (refractory castables and insulation blocks), etc.



3. The multi-layered nature of raw materials and characteristics: the main crystal phase of corundum is a-Al2O3, which can be mixed with various nickel hydroxide and non-metal oxides, thereby improving some of its own characteristics, such as high temperature shock resistance and slag resistance (acid or alkali) etching, etc. Mixed with SiO2 to form corundum zirconium corundum refractory, mixed with MgO to form corundum spinel refractory, mixed with zircon sand (ZrO2 and SiO2) to form Al2O3-SiO2-ZrO2 refractory, mixed with carbon-carbon composite material and carbon to form Al2O3- SiC-C refractories, etc.



4. The multi-layered bonding method, corundum is very compatible with all kinds of adhesives, and various bonding methods can be used, such as high temperature calcination, low temperature bonding, etc., which can impart different characteristics to the raw materials .



We know some characteristics of corundum in refractory materials. At this stage, let's take a look at two important products in corundum refractories, which are divided into shaped products and no shaped products.



The key to stereotyped products includes:



1. Corundum fire safety products: more than 98% Al2O398%, self-bonding solid-phase calcined high-purity corundum products, the bonding phase is mainly corundum, and there is also a small amount of zirconium corundum. It is suitable for biomass gasifiers, carbon black atomic furnaces, biomass gasifiers, ammonia melting furnaces, two-stage conversion furnaces, high-temperature and ultra-high-temperature industrial kilns in the fire safety porcelain industry.



2. Modified engineering plastic high-alumina bricks: ① Low stress relaxation high-alumina bricks: For high-alumina bricks with a stress relaxation temperature of 1500°C-1550°C, a part of pe fused pipe fittings corundum and siliceous bricks can be added. The raw materials are made of low stress relaxation high alumina bricks. ②Polyphosphate-bonded high-alumina bricks: use jit or yiji high-alumina bauxite lightly burned dolomite as an important raw material, use calcium carbonate solubility product constant or aluminum phosphate solubility product constant as binding agent, and add a small amount of pe fused Analytical chemistry combined with fire safety products made of corundum, zirconium corundum, etc. Reinforcement of furniture wood panels and heat treatment at 400-600 ° C. Suitable for hot air boilers, cement kilns, heat treatment electric furnace tops, ladle, etc.



3. Corundum-zirconium corundum products: It is made of white corundum, flat corundum, zirconium corundum and other raw materials for pe fused pipe fittings, and is made by seasoning, mixing, high-pressure molding, and high-temperature industrial kiln firing. The main crystal phase of the product is corundum, and the bonding phase is zirconium corundum. It is suitable for high temperature firing kilns, push plates, bearing plates and other kiln furniture in the porcelain industry.



Identification code stereotyped products:



All kinds of corundum raw materials can be used as sand and fine particle materials to make unshaped fire safety products. According to the difference of adhesive and operation process, it can be divided into the following categories:



Refractory castables: corundum mass, corundum-spinel, corundum-SiC-C.



Refractory and ductile refractory: corundum mass, sandstone: all kinds of corundum; binder: sodium metasilicate, polyphosphate and analytical chemical binder.



Fire safety ramming material: corundum mass, sandstone: all kinds of corundum; binder: calcium carbonate, polyphosphate, etc.



Fire safety mixed mortar: used for the junction of a small piece of corundum fire safety masonry.