| 摘要 |
Disclosed is an improved method for mass production of phosphoric acid with a rotary kiln, comprising the following steps: pre-treating raw materials of a carbonaceous reductant, a phosphate ore and silica respectively, and then mixing same; preparing the pre-treated carbonaceous reductant powder, phosphate ore powder and silica powder into cores; then evenly mixing the carbonaceous reductant powder and the silica powder to obtain a cladding material; mixing the cores and the cladding material for cladding treatment, drying and solidifying same to obtain composite pellets; sending the composite pellets into a rotary kiln for a reduction reaction; sending the high-temperature slag balls exiting the rotary kiln to a cooling device for comprehensive utilisation; introducing the smoke containing P2O5 and fluorine exiting the kiln into a hydration tower for absorbing phosphorus by hydration, then passing same through a phosphoric acid fog capturing tower and a fog removing and separating tower successively, and the fluorine-containing smoke discharged from the fog removing and separating tower entering a subsequent fluorine recovery procedure. The process flow of the present invention is reasonable and optimized, the equipment investment is low, the economic added value is high, the whole process is energy-saving, environmentally friendly and efficient, and the product quality is excellent. |
