磷矿资源加工研究进展:3.对低品位磷矿中高铁铝杂质的钝化  

Research progress of phosphate resource processing:3.Study on the passivation of iron and aluminum impurities in medium and low grade phosphate rock

作　　者：刘代俊[1] 杨军[1] 江成发[1] 陈伟[1] 

机构地区：[1]四川大学化工学院四川省磷化学与工程重点实验室,四川成都610065

出　　处：《磷肥与复肥》2009年第2期17-18,共2页Phosphate & Compound Fertilizer

摘　　要：介绍采用高铁铝中低品位磷矿获得较高质量磷酸的新工艺。对酸解过程加入钝化剂,磷矿中铁铝杂质矿物表面形成致密膜,阻碍铁铝杂质在液相中的溶出,以实现对铁铝杂质的抑制。对于新的两段法二水流程铁铝的浸出率可低于20%,对于普通二水工艺铁铝浸出率约25%,磷的浸出率仍可保持在90%以上。该法对于中低品位高铁铝杂质磷矿具有较好的应用价值。A new technology for obtaining high quality phosphoric acid from medium and low grade phosphate rocks with high iron and aluminum content is developed. The dense membranes at the surface of sesquioxide impurities including iron and aluminum compounds of the rock particles are formed by adding passivating agent as to hinder sesquioxide impurities dissolving to liquid phase, which results in control to impurities in phosphoric acid. For the new two section diahydrate process, the results show that the solubility of the sesquioxide in liquid phase is lowered to 20%, compared with the 25% of the traditional diahydrate process. However, extraction fraction of the phosphate rock still keeps in more than 90%. The technology will have better application for medium anti low .grade phosphate rock with the higher contents of iron and aluminum impurities.

关 键 词：低品位磷矿 高铁铝杂质 湿法磷酸 钝化 浸出率 

分 类 号：TQ126.35[化学工程—无机化工] TD985[矿业工程—选矿]