关键词: 磷石膏, 催化, 综合利用

Abstract: A kind of processing method for phosphorus gypsum with catalyst was discussed.Under the action of catalyst,phosphorus gypsum was transformed into sulfuric acid and calcium chloride,as well as by-product ammonia and dry ice etc..Add water to phosphorus gypsum according to a 3∶1 mass ratio of water to solid material,Then stir,put it aside,separate solid and liquid and repeat those for 3 times.Mix phosphorus gypsum after washing with ammonium bicarbonate and ammonium bicarbonate excess of 5%.Then add water whose volume is 2 times as much as that of the raw materials, at room temperature,stir 50 min.Separate the above-mentioned material and solid reacts with concentrated hydrochloric acid until there is no gas released at room temperature.After ammonium sulfate solution was evaporated,mix it with catalyst,catalyst excess of 50%,at temperature of 500 ℃ for 1.5 h.Then continue to heat up to 800 ℃ for 0.5 h,and absorb sulfur trioxide with concentrated sulfuric acid to produce the sulfuric acid with required concentration at the same time.This method is conductive to solving the problems,such as floor space cost and environmental pollution of phosphorus gypsum,and the resources can be effective used. 

Key words: phosphorus gypsum, catalyst, comprehensive utilization