杂质对磷石膏与碳酸铵反应及产物碳酸钙结晶的影响  

Effect of Impurities on Conversion of Gypsum and Crystallization of Calcium Carbonate

作　　者：丁光月[1] 李岳[1] 樊彩梅[1] 荆宏健 冯军强[2] 

机构地区：[1]太原理工大学化学化工学院,太原030024 [2]天脊煤化工股份有限公司,山西潞城047507

出　　处：《太原理工大学学报》2011年第6期593-597,共5页Journal of Taiyuan University of Technology

基　　金：校企科研合作资助项目(2008-1225)

摘　　要：用碳酸铵与磷石膏反应制取硫酸铵是磷石膏利用的有效途径之一,但磷石膏中的杂质会对石膏的转化过程及碳酸钙的结晶产生不利影响,进而影响碳酸钙的分离过程。以二水硫酸钙与碳酸铵为原料,以磷酸、硝酸镁、氟化钠及酸不溶物(AI)为杂质添加剂,研究了磷石膏复分解反应制取硫酸铵过程中杂质P2O5、Mg2+、F-及AI对硫酸钙转化率的影响,并对反应产物碳酸钙的结晶形态和晶型进行了SEM和XRD分析。结果表明,杂质的存在不仅降低了石膏中硫的转化率,而且使碳酸钙的晶型和晶体形状发生了变化,从而将影响产物的物性和过滤性能。An effective approach of phosphogypsum utilization is the production of ammonium sulfate from ammonium carbonate and phosphogypsum.However,impurities in phosphogypsum have a negative impact on gypsum transformation process and the crystallization of calcium carbonate,and thus on the separation process of calcium carbonate.In this paper,calcium sulfate dihydrate and ammonium carbonate were used as raw materials,with phosphoric acid,magnesium nitrate,sodium fluoride and acid-insoluble material（AI） as impurity additives,to investigate the effects of the impurities P,Mg2＋,F-and AI on the conversion of calcium sulfate.The crystal line state and morphology of the product calcium carbonate were characterized by SEM and XRD analysis.The results show that the impurities not only affected the conversion of sulfur in gypsum,but also changed the type and shape of calcium carbonate crystal,consequently,affected the physical properties and filtration performance of products.

关 键 词：杂质 二水硫酸钙 碳酸铵 转化率 碳酸钙结晶 

分 类 号：TQ429[化学工程]