磷石膏制备高纯碳酸钙的试验研究  

Experimental Study on Preparation of High-purity CaCO_(3) from Phosphogypsum

作　　者：刘禄 乔静怡 刘卓齐 肖家琴 丁文金[1] 孙红娟[1] LIU Lu;QIAO Jingyi;LIU Zhuoqi;XIAO Jiaqin;DING Wenjin;SUN Hongjuan(Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010

出　　处：《矿产保护与利用》2022年第5期126-131,共6页Conservation and Utilization of Mineral Resources

基　　金：四川省大学生创新创业训练计划项目创新训练项目(S202110619021)。

摘　　要：基于磷石膏的资源化利用,采用化学浸出—碳化的方法制备了一种球霰石型轻质碳酸钙。以工业固废磷石膏为原料,进行了磷石膏浸出和碳化的单因素试验。试验结果表明,最优的磷石膏浸取工艺条件为:乙酸钠溶液浓度4 mol/L,液固比25∶1 mL/g,盐浸温度50℃,盐浸时间30 min;最优碳化工艺条件为:氨水添加量15 mL,CO_(2)气体流速80 mL/min,碳化温度30℃,碳化时间60 min。产物轻质碳酸钙经表征后,得出产物为球霰石型碳酸钙。乙酸钠助剂经过8次循环后仍可制备出轻质碳酸钙,助剂两次循环后,轻质碳酸钙产率为57.8%。该研究为磷石膏的综合利用和轻质碳酸钙的生产提供了一种新的方法。Based on the resource utilization of phosphogypsum,a kind of spherical calcium carbonate was prepared by chemical leaching-carbonization method.The single factor experiment of leaching and carbonization of phosphogypsum was carried out.The experimental results showed that the optimal extraction conditions of phosphogypsum were as follows:sodium acetate concentration of 4 mol/L,liquid-to-solid ratio of 25∶1 mL/g,salt leaching temperature of 50℃,salt leaching time of 30 min.The optimal carbonization conditions were as follows:ammonia concentration 15 mL,CO_(2)flow rate 80 mL/min,carbonization temperature 30℃,carbonization time 60 min.The crystal phase of the product was vaterite,and the morphology of the product was spherical.After 8 cycles of sodium acetate auxiliaries,the reaction efficiency of calcium carbonate production was 57.8%after two cycles of sodium acetate auxiliaries.This study provides a new method for phosphogypsum comprehensive utilization and calcium carbonate production.

关 键 词：磷石膏 乙酸钠 高纯碳酸钙 循环利用 

分 类 号：TD177.3[矿业工程—矿山地质测量] TD985