铁对H_(2)SO_(4)-BeFeY_(2)O_(3)·2SiO_(2)-H_(2)O体系沉淀热力学的影响  

Effects of Iron Ions on Thermodynamics of Precipitation in H_(2)SO_(4)-BeFeY_(2)O_(3)·2SiO2-H2O System

作　　者：胡皓东 徐略渭 何秉轩 雷鑫 梁勇[1] HU Haodong;XU Luewei;HE Bingxuan;LEI Xin;LIANG Yong(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000

出　　处：《湿法冶金》2023年第1期18-24,共7页Hydrometallurgy of China

基　　金：江西理工大学清江青年英才支持计划项目(JXUSTQJBJ2017004);江西省离子型稀土资源绿色开发与高值利用国家重点实验室培育计划项目(20194AFD44003)。

摘　　要：根据热力学数据,绘制了25℃下H_(2)SO_(4)-BeFeY_(2)O_(3)·2SiO_(2)-H_(2)O体系的lg cB-pH关系曲线,讨论了体系中各离子浓度变化趋势和沉淀稳定区的形成条件。结果表明:当溶液中的铁为二价铁时,铁、铍、钇的水解pH分别高于6.2、3.7和6.8,铍的水解pH远小于铁、钇水解pH,可优先被去除,但铁和钇的水解pH接近,二者无法通过水解分离;当溶液中的铁为三价铁时,铁的水解pH降至1.4,铁和铍的水解pH均远小于钇的水解pH,较易通过水解去除。According to the thermodynamic data,the lg cB-pH relationship curve of H_(2)SO_(4)-BeFeY_(2)O_(3)·2SiO_(2)-H_(2)O system at 25℃was drawn.The changing trend of each ion concentration in the system and the formation conditions of the precipitation stability zone were discussed.The results show that when the iron in the solution is Fe^(2+),the pH of hydrolysis of iron,beryllium and yttrium are higher than 6.2,3.7 and 6.7,respectively.The pH of hydrolysis of beryllium is smaller than that of Fe and yttrium,so it can be preferably removed.However,the pH of hydrolysis of Fe and yttrium is close to each other,so they can not be separated by hydrolysis.When the iron in the solution is Fe 3+,the pH of iron hydrolysis decreases to 1.4,and the pH of iron and beryllium hydrolysis is much smaller than that of yttrium,which are easier to be removed by hydrolysis.

关 键 词：硅铍钇矿 铁 硫酸 浸出 热力学 水解 分离 

分 类 号：TF845[冶金工程—有色金属冶金]