Special phosphate bricks and magnesia-alumina-chromium bricks are both lining zinc volatilization kilns and are made of more suitable materials.
Because the zinc volatilization kiln is a dynamic kiln. The kiln is in a high-temperature and constantly rolling operating state. The physical and chemical reactions in the lining are intense and complex, and the kiln lining is severely worn. The selection of refractory bricks for the lining must be very careful.
The zinc volatilization kiln has a large lining volume, which will cause cylinder deformation; it is necessary to design a reasonable brick type and select refractory bricks of appropriate materials; the refractory bricks used have many seams and are easily corroded by slag, so try to use dry construction; in addition, The kiln lining will be subject to the combined effects of mechanical erosion and reducing atmosphere, and the refractory material of the lining will erode very quickly. It is a prerequisite to choose corrosion-resistant and wear-resistant refractory bricks. Clay bricks corrode the fastest, while magnesia bricks, magnesia-alumina bricks, chrome slag bricks and magnesia-chrome bricks corrode slowly.
In recent years, the special phosphate bricks developed by manufacturers of phosphate bricks, that is, phosphate bricks with a density of more than 2.9, have been used very well. However, the magnesia-alumina-chromium bricks have also been used very well in volatilization kilns. The difference between these two materials of refractory bricks is that one is chemically bonded bricks and the other is magnesia refractory bricks, and the other is the price. The price of special phosphate bricks is still nearly 2,000 lower than that of magnesia-alumina chrome bricks. Yuan. Because of its price, the use of special phosphate bricks has relative advantages.
If you choose magnesia-alumina-chrome bricks, it is absolutely possible. They have a long service life and low replacement frequency. In terms of price, special phosphate bricks are low-cost and are also a good choice for high-temperature linings. At present, there are many special phosphate bricks on the market.
As for preheat zone and cooling zone bricks, high alumina bricks or ordinary phosphate bricks can be used. In recent years, high alumina bricks and ordinary phosphate bricks have been used. In terms of market usage ratio, ordinary phosphate bricks are more commonly used. If If special phosphate bricks are used in the high-temperature zone, because they are made of the same material as the bricks in the high-temperature zone, the kiln lining atmosphere will be consistent. Moreover, the phosphate bricks are more wear-resistant than high-alumina bricks and have a relatively longer service life.
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