湿法磷酸浓缩后的氟分配及脱氟工艺研究  

Research on distribution of F and defluorination process for concentrated WPA

作　　者：阳杨 盛勇 周佩 陈明凤 

机构地区：[1]中化化肥有限公司成都研发中心,四川成都610100

出　　处：《磷肥与复肥》2015年第9期31-33,37,共4页Phosphate & Compound Fertilizer

摘　　要：湿法磷酸脱氟工艺研究十分广泛,根据氟在湿法磷酸中可能存在的氟盐,以及不同氟盐的平衡常数、水解常数、溶度积等,推导得出传统化学沉淀脱氟所存在的局限性,并给出了改善建议。通过分析各种脱氟剂配方效果,认为除添加硅藻土外,协调Na^+、Ba^(2+)、Al^(3+)含量也有利于氟的脱除。The research of defluorination technology in WPA is very broad, the various forms of fluoride in the WPA and its equilibrium constant, hydrolysis constants, solubility products, the defluorination limitations by traditional chemical precipitation are deduced, and the positive suggestions are gave. Through the analysis of various fluorine reagent formula effect, it is considered that besides adding diatomaceous earth, coordinate the Na^＋, Ba^2＋ and Al^3＋ percentage also is helpful for fluoride removal.

关 键 词：湿法磷酸 化学脱氟 平衡常数 络合 

分 类 号：TQ126.35[化学工程—无机化工]