氧化-沉淀法净化湿法磷酸的研究  

Study on purification of wet-process phosphoric acid by oxidation and precipitation methods

作　　者：路超[1] 张伟[1] 刘杰[1] 王家盛[2] 刘宾宾[3] 

机构地区：[1]燕山大学环境与化学工程学院,河北秦皇岛066004 [2]中国阿拉伯化肥有限公司 [3]燕山大学材料学院

出　　处：《无机盐工业》2011年第9期49-51,共3页Inorganic Chemicals Industry

基　　金：国家科技支撑计划课题资助(2008BADA4B04)

摘　　要：为对湿法磷酸进行脱色和除铁、铝离子,采用氧化-沉淀法对湿法磷酸进行净化。首先向湿法磷酸中加入一定量的过氧化氢进行脱色,然后加入一定量的沉淀剂草酸钾和助沉淀剂碳酸钠去除磷酸中的铁、铝离子。通过单因素实验,得到湿法磷酸净化的最佳工艺条件:过氧化氢用量为1%(体积分数),草酸钾用量为0.5%(质量分数),碳酸钠用量为0.3%(质量分数),反应温度为45℃,反应时间为12 h。在最佳条件下,湿法磷酸脱色率达到95%以上,铁和铝的净化率分别达到47.51%和9.30%。In order to make decoloration and to remove iron and aluminum ions for wet-process phosphoric acid,the method of oxidation and deposition was used to purify wet-process phosphoric acid.Firstly,a certain amount of hydrogen peroxide was added for decoloration of wet-process phosphoric acid,and then a certain amount of precipitator potassium oxalate and precipitation assistant sodium carbonate were added for removing iron and aluminum ions.With single factor experiments,the best technological conditions of purifying wet-process phosphoric acid were obtained as follows：decolored rate could reach above 95%,and the purification rates of iron and aluminum could reach 47.51% and 9.30% respectively when the temperature was 45 ℃,amount of hydrogen peroxide was 1%（volume fraction）,dosage of potassium oxalate was 0.5%（mass fraction）,dosage of sodium carbonate was 0.3%（mass fraction）,and the time was 12 h.

关 键 词：湿法磷酸 氧化-沉淀 净化 

分 类 号：TQ126.35[化学工程—无机化工]