磷石膏脱硫钙渣净化湿法磷酸的实验研究  

Experimental study on purification process of wet-process phosphoric acid with phosphogypsum desulfurization slag

作　　者：赵丽静[1] 张志业[1] 杨秀山[1] 杨林[1] 孔行健[1] 王辛龙[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《磷肥与复肥》2015年第5期9-12,共4页Phosphate & Compound Fertilizer

基　　金：国家"863"项目课题(2011AA06A106)

摘　　要：研究了以磷石膏脱硫钙渣为原料替代天然石灰用于饲料级磷酸氢钙生产中的湿法磷酸净化,通过与天然石灰净化湿法磷酸净化深度的对比,分析了不同p H值条件下各种杂质含量的变化趋势和沉降体积随时间的变化趋势。结果表明,在用磷石膏脱硫钙渣净化湿法磷酸的过程中,各种杂质含量的变化趋势与用天然石灰净化湿法磷酸过程变化趋势基本相同,对比铁、铝、镁的脱除率和沉降体积的数据,用磷石膏脱硫钙渣体系替代天然石灰不会对工业实际生产造成影响,其磷收率为87.3%(p H 2.65下),石灰体系为88.0%(p H 2.73下),两者基本持平。Experiment of purification process of WPA(used as the raw material of feed grade calcium hydrogenphosphate) with phosphogypsum desulfurization slag instead of natural lime is studied, the change trends ofvarious impurities in different p H conditions of the purification of wet-process phosphoric acid are analyzedcompared with the natural lime. The results show that the impurities removal rates in phosphogypsumdesulfurization slag system are consistent with that of natural lime system. Based on the sedimentation volumedata and the impurity removal rates of iron, aluminum, magnesium, with phosphogypsum desulfurization slaginstead of natural lime will not affect the industrial production,the phosphorus recovery rate in phosphogypsumdesulfurization slag are similar to that in natural lime system, are relatively of 87.3%(under pH 2.65) and88.0%(under pH 2.73).

关 键 词：磷石膏 脱硫钙渣 天然石灰 杂质离子 饲料级磷酸氢钙 

分 类 号：TQ126.35[化学工程—无机化工] X781[环境科学与工程—环境工程]