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The actual utilization of phosphogypsum as the background to the the waste phosphogypsum use of phosphatic compound fertilizer industry in China the status quo, and the combination of phosphate fertilizer plant, a clean and efficient way for the use of phosphogypsum selection. Detailed analysis of the physical and chemical properties of phosphogypsum, explore the many factors impact on the conversion rate of phosphogypsum sulfate in process of phosphogypsum preparation of ammonium sulfate, and the preparation of ammonium sulfate of the optimum control conditions;, and byproducts carbonated calcium research and use, and to change the particle diameter of the by-product calcium carbonate to byproduct calcium carbonate as a filler of polypropylene, reducing the impact on the environment, the clean and efficient use of phosphogypsum. Systematic analysis of the chemical and mineral composition of phosphogypsum, while observing the shape of phosphogypsum crystals; radioactive phosphogypsum analysis to determine the specific activity of radionuclides in phosphogypsum lower measure, without any restrictions on its product development, can be assured. Develop a scientific test methods in accordance with the theory of the phosphogypsum Preparation of ammonium sulfate. The phosphogypsum First pretreatment, then single factor test to determine the optimal process of preparation of phosphogypsum ammonium sulfate. Phosphogypsum preparation of ammonium sulphate single factor test based on the use of response surface methodology on several major factors affect the the phosphogypsum sulfate conversion rate optimization, material ratio, temperature, feed rate, and the amount of dispersant, and get the most good level; material ratio 1.19, temperature of 44 ° C, the feed rate 28 g / min and dispersed dosage 1300ppm, the phosphogypsum sulfate conversion rate of 97.01%. Ammonium sulfate solution by neutralization, crystal, ammonium sulfate crystals after drying, has been tested to achieve the requirements of GB First grade. Preparation of ammonium sulfate in the reaction system of the phosphogypsum dispersants to control the particle size of the by-products of calcium carbonate; assessment indicators, as a by-product of calcium carbonate particle size combined by orthogonal test and single-factor test to determine the material ratio, temperature , feed rate, the amount of dispersant better level: material ratio 1.20, temperature 40 ° C, the feed rate 5.0g/min the dispersant dosage for 3500ppm. The consolidated balance method to determine the phosphogypsum into prepared by ammonium sulfate, the cogeneration calcium carbonate optimum conditions: material ratio of 1.2, a temperature of 40 to 44 ° C, the feed rate 28g/min dispersant dosage of 1300 ppm. Byproduct calcium carbonate and polypropylene made from composite materials, the mechanical properties relative to the mechanical properties of the pure polypropylene decreased to varying degrees, but the right amount of byproduct calcium carbonate as a filler material, to reduce the cost of production of plastics, to reduce energy consumption.
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