Method for producing phosphoric acid from phosphate ore by displacement method
A replacement method and phosphate rock technology, applied in the direction of phosphoric acid, phosphorus oxyacid, etc., can solve the problems of blocked industrial application, large amount of dust in the furnace gas, and can not be added, so as to achieve easy operation of gas separation and control methods , The furnace gas flow rate is reduced, and the effect of saving carbon for reduction
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[0013] The pulverized coal is sprayed into the cyclone kiln (1) by the feeder (4) with air preheated below 300°C for rotary combustion, and the air coefficient is controlled to 1.05. The pulverized coal air volume accounts for 20% of the total air consumption. The fineness is: 6 mesh pass rate: 60%. When the temperature in the kiln (1) reaches 1450℃, the mineral powder is sprayed into the cyclone kiln (1) with preheated air through the quantitative feeder (5) to carry out the high-temperature melting displacement reaction and keep the temperature in the cyclone kiln at 1450—1600°C. According to the amount of CaO in the phosphate rock / SiO 2 =1.35 (by dry basis weight ratio), the batching of phosphate rock powder and silica powder is: the amount of silica powder = CaO / 1.35-SiO in the phosphate rock 2 Amount ÷ SiO in silica 2 Content. Control the secondary air volume of the ore powder to 80% of the total air volume, and the P produced by the coal-burning waste gas and the replacement...
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