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Ammonium Sulfate and Calcium Carbonate Prepared by Ball-milling from Phosphogypsum-Ammonium Bicarbonate-Ammonia Water

Li Na1 Deng Yuequan1 Dong Faqin2 Luo Shaodong1 Li Shanshan1 Peng Baoyao1(1 School of Materials,Southwest Univ of Sci & Tech,Mianyang,Sichuan 621010;2 The Ministry of Education Key Laboratory of Solid Waste Disposal and Resource Builded by Province and the Ministry of Education,Mianyang,Sichuan 621010)  
Ammonium sulfate and calcium carbonate were prepared using phosphogypsum,ammonium bicarbonate and ammonia water as raw materials by ball-milling technique.The optimum conditions were explored through orthogonal test,the major elements and phase composition of two kinds of products were analyzed by XRF and XRD,and the grain size distribution and poisonous elements of calcium carbonate were determined using laser particle size analyzer and ICP.The analysis results showed that the optimum technological conditions were as follows: the liquid-solid ratio was 0.5,the response time was 45 min,the ball-material ratio was 3:1,rotational speed was 600 r/min,and the average conversion reaction was up to 97.95%;the product quality of ammonium sulfate reached the standard of byproduct ammonium sulfate,poisonous and harmful elements contents of calcium carbonate were far lower than quality criteria of soil environment allows.Preparation of ammonium sulfate and calcium carbonate from phosphogypsum by ball-milling achieved the purpose of effectively using phosphogypsum.
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