Ammonium sulfate preparation from phosphogypsum waste

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• 作者：Abdel-Hakim T. Kandil^a ; Mohamed F. Cheira^b ; ^{mf.farid2008@yahoo.com} ; Hady S. Gado^b ; Madiha H. Soliman^a ; Hesham M. Akl^a
• 关键词：Phosphogypsum waste ; Carbonate ; Preparation ; Ammonium sulfate
• 刊名：Journal of Radiation Research and Applied Sciences
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：10
• 期：1
• 页码：24-33
• 全文大小：1282 K
• 卷排序：10

文摘

The Egyptian phosphogypsum waste is treated using sulfuric acid prior the ammonium sulfate production. The relevant factors that would affect the removal efficiencies of some impurities are studied. The optimum conditions of the treatment are 8 M sulfuric acid solution and 1/4 solid/liquid ratio for 30 min contact time at 80 °C. Moreover, the optimum conditions of the ammonium sulfate preparation are 10 g of the suspended impure or purified phosphogypsum in 40 ml of 3% ammonium sulfate solution (as initiator), 1/4 solid/liquid ratio at pH7 at an addition of an excess ammonium carbonate, and 150 rpm stirring speed for 4.0 h contact time at 55 °C as well as the 5 mg of barium chloride is added to remove the radium in the ammonium sulfate product. Finally, the ammonium sulfate is crystallized and the chemical analysis of the product shows 20% nitrogen and 23.6% sulfur. Therefore, the purity of the obtained ammonium sulfate is 95% from the purified phosphogypsum.