Process for treating tail gas of rare earth mineral powder and concentrated sulphuric acid roasting process
A roasting process and exhaust gas treatment technology, applied in the field of environmental engineering, to achieve the effect of reducing capacity, volume, avoiding energy consumption and investment
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[0058] A roasting project uses concentrated sulfuric acid to roast rare earth concentrates at high temperature. During roasting, sulfuric acid decomposes and sulfuric acid reacts with rare earth minerals to produce sulfur-containing and fluorine-containing tail gas.
[0059]
[0060] 1. Comparison of water saving
[0061] The conventional three-stage spray cooling and acid recovery process cools 15,000m3 / h of flue gas from 300°C to 60-80°C, and the water consumption is about 2t / h. In this way, the water consumption is 48t / h in 24 hours a day, and the water consumption in a year ( Calculated on the basis of 8000 hours), about 16000t / h, ten roasters of the same type in the whole plant, the annual evaporation water consumption is 160000t / h.
[0062] The partition wall is used as a cooler to cool the flue gas from 300°C to 60-80°C. If the inlet temperature of the cooling water is 25°C and the outlet temperature is 30°C, about 120t / h of cooling water is required per hour, but th...
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