AZS brick

The abbreviation of fused zirconia corundum brick is AZS, which is arranged according to the three chemical components of the Al2O3-Zr02-Sio2 ternary system phase diagram according to their content. Al2O3 is A, Zr02 is Z. Sio2 takes S. National standards use this abbreviation. For example, No. 33 fused-cast zirconium corundum brick, abbreviated as AZS—33#, No. 36 fused-cast zirconium corundum brick, abbreviated as AZS—36#, No. 41 fused-cast zirconium corundum brick, abbreviated as AZS— 41#.

azs brick manufacturing process

The azs brick manufacturing process mixes selected zircon sand and industrial alumina powder at a ratio of 1:1, plus a small amount of NaZO (added in the form of sodium carbonate), B20: (added in the form of boric acid or borax) flux, and mix Uniformity, after being melted at 1900~2000℃, it can be cast to form a fused-cast brick containing ZrO2 33%. On this basis, using partially desiliconized zircon sand as raw material, fused cast bricks containing 36% to 41% ZrO2 can be produced.

Melting and casting process of AZS brick

1. AZS raw materials There are five kinds of raw materials for AZS: alumina, zircon sand, zircon-rich sand, soda ash, and borax. 1) The introduction of alumina generally uses industrial alumina, and the production requires that its water content should be less than 0.3%, and the loss on ignition Z should be less than 0.15%. One ton of AZS-33 fused brick requires about 0.62 tons of alumina. 2) Zircon sand mainly introduces 2ZrO and 2SiO, but it also contains a small amount of 2TiO and 23FeO. 23FeO can dye AZS products, cause coarse crystal sand holes, and also affect cracking, so its content should be less than 0.2%. 2TiO affects the casting Cracking during the cooling process will also affect the oxidation process of the product, so its content should be limited to less than 0.2%. A ton of AZS-33 fused brick requires about 0.65 zircon sand. 3) Zirconium-rich sand is also called desiliconized zirconium. All the silica in AZS comes from zircon, and the insufficiency of 2ZrO is supplemented by zirconium-rich sand. 4) Soda ash introduces sodium oxide as a flux for AZS bricks, generally second-grade products are used. One ton of AZS-33 fused bricks requires about 20kg of soda ash. 5) Borax is also a flux for AZS bricks. One ton of AZS-33 fused brick requires about 20kg of borax.

2. Working principle of electric arc furnace The furnace body of electric arc furnace consists of three parts: bottom, wall, and cover. Three graphite electrodes are inserted from the cover to form a triangle, and 5-10kg of arcing coke is placed on the center projection position of the three electrodes. After the coke is compacted, the three-phase electrodes are lowered synchronously. One coke triggers the three-pole arc starting at the same time. After starting the arc, slowly feed the material, and the principle of not breaking the arc, and the current should not exceed the rated value, generally Half an hour after the arc is started, the current can be stabilized, and then it enters the control period. The batch material has a high resistance, and the arc reaches the batch material and generates a huge amount of heat, which then melts the batch material.

3. AZS melting principle AZS melting process has four purposes: the aluminum oxide in the batch is melted and recrystallized into corundum; the zirconium oxide after the decomposition of zircon is melted and recrystallized into oblique zircon; it is made of sodium boron The denaturant is always mullite formed and combined with silica to form the glass phase required for the product; prepare a melt with uniform chemical composition, less carbon content, less bubbles Z, a certain temperature and good casting performance, so that Cast high-quality products.