硝酸酸解磷尾矿制备氢氧化镁工艺条件研究  

Study on the process conditions to produce magnesium hydroxide from phosphate tailings by using nitric acid leaching

作　　者：张萍花[1] 张春丽[1] 王红艳[1] 谢永[1] 李晓玲[1] 张德谨 胡雅琳 

机构地区：[1]宿州学院化学化工学院,安徽宿州234000

出　　处：《现代化工》2017年第5期102-105,共4页Modern Chemical Industry

基　　金：省教育厅自然科学研究重点项目(KJ2015A203);王红艳名师工作室(2016msgzs071);宿州学院重点平台项目(2016ykf03);宿州学院重点科研项目(2016yzd03);宿州学院一般科研项目(2014yyb09)

摘　　要：以磷尾矿经硝酸复合溶剂酸解、除铁等纯化过程得到的镁源为原料,采用碱性沉淀剂制备氢氧化镁。探讨了不同沉淀剂、沉淀剂滴加速度、沉淀温度、陈化时间对产品纯度及回收率的影响。实验结果表明,当选择氨水为沉淀剂,滴加氨水使溶液pH达到11.5,滴加速度为1.5 m L/min,沉淀反应温度为45℃,陈化时间为120 min,在此条件下镁回收率为89.86%,产品Mg(OH)2纯度为90.43%。并用XRD、粒度分析仪和SEM分别对产物的成分、粒度分布以及形貌特征进行分析,测试表明,产品粒度均匀,呈片状。Magnesium hydroxide has been prepared by using alkaline precipitating agent and magnesium source that comes from phosphate tailings after purification process of nitric acid composite solvent acid leaching and de-ironing. The effects of different precipitants,adding rate of precipitant,reaction temperature and aging time on the product purity and recovery rate are studied. The experimental results indicate that if ammonia is used as precipitant with conditions including pH 11. 5,adding flow rate of ammonia 1. 5 m L/min,reaction temperature 45℃ and aging time 120 min,the recovery rate of magnesium is 89. 86% and the content of Mg（ OH）2in the product is 90. 43%. The composition,particle size distribution and structure properties of obtained magnesium hydroxide product are characterized by XRD,SEM and TG. The results indicate that the obtained products are magnesium hydroxide with high purity,uniform particle size and schistose structure.

关 键 词：磷尾矿 酸解 氢氧化镁 

分 类 号：TQ028[化学工程]