Service cycle of resistant materials for zinc smelting rotary kiln
Under normal circumstances, the calcination belt uses bricks with a body density of more than 2.9, the transition belt uses 2.6 body density of ordinary phosphate bricks or high aluminum bricks, there are also the use of magnesia-aluminum-chromium bricks, but because magnesia-aluminum-chromium bricks are expensive, the selection of manufacturers are not many, more than 95% of the use of special phosphate bricks. However, if from the use cycle, it has been a question that can not be answered precisely, because the raw materials used in zinc smelting are different, resulting in the use cycle of the lining material can not be determined.
The raw materials used in zinc smelting rotary kiln can be basically determined by region, under normal circumstances, Jiangxi, Hunan, Hubei zinc smelting raw materials are zinc ingot, zinc slag, coke powder, or blast furnace gas dust, zinc oxide ore, coke powder, the two raw materials used in rotary kiln, after 1000-1300℃ high temperature reduction gasification, and then condensation treatment to zinc oxide. The service cycle of the rotary kiln produced by these two raw materials is relatively long, generally more than 10 months. However, if the raw material is changed halfway, it is not possible to determine the use cycle, or the raw material measurement is not accurate, and the forklift does not measure the mixture in production, it will also increase due to the degree of erosion, so that the service cycle of the rotary kiln lining is shortened.
The other is the use of boiling furnace acid leaching waste zinc slag, but this raw material is generally in Anyang, Xingtai, Handan area, especially Anyang area, because this raw material in the rotary kiln calcination, impurities and reduction of metal corrosion is too large, and will be in the rotary kiln lump or sheet slag, hanging on the kiln lined phosphate brick, the thickness of the knot makes the kiln diameter smaller, affecting the output. In this case, the manufacturer will wash the kiln, and the washing kiln is a high-temperature slag melting discharge, each washing kiln causes the phosphate brick to erode 6-7 cm, so that the service life of the lining resistant material is shortened. If the kiln is washed half a month, the phosphate brick lining of the rotary kiln will be changed for more than 2 months. If the kiln is washed once a month, it can be used for 4 months.
Therefore, the cycle of special phosphate brick with zinc rotary kiln lining cannot be determined, because the kiln is in a state of high temperature and continuous rolling, the physical and chemical reaction in the kiln is intense and complex, and the kiln lining is seriously worn, but also depends on the raw materials used, the number of kiln washing, and whether to continue to operate.