P_(507)-煤油萃取稀土过程有机相损失及硫酸铝混凝法从萃余水相除油  

Organic Phase Lose in Rare Earth Extraction by P_(507)-kerosene and Oil Removal from Raffinate Phase by an Aluminium Sulphate Coagulation Method

作　　者：蔡水冬 杨丽芬 孙园园[1] 刘艳珠[1] 李永绣[1] 

机构地区：[1]南昌大学稀土与微纳功能材料研究中心,江西南昌330031

出　　处：《稀土》2017年第6期33-40,共8页Chinese Rare Earths

基　　金：科技部973计划项目(2012CBA01204);国家自然科学基金项目(51274123)

摘　　要：采用萃取法从低浓度稀土溶液中回收稀土需要解决的关键技术问题是如何降低有机相的水溶和乳化损失。本研究建立了萃余水相中煤油含量的测定方法,并用于研究P_(507)-煤油萃取稀土时萃余水相的油含量随相比A/O、振荡时间、振荡强度、分相时间的变化,评价了混凝-沉淀法去除水中煤油的效果及随主要条件的变化。结果表明,萃余水相煤油含量随A/O的减小和分相时间的延长而降低,而其他条件影响不大;确定了常温下以Al_2(SO_4)_3作为混凝剂的混凝—沉淀法去除水中油的最佳条件是:进水pH在9~10之间、Al^(3+)投加量120.0 mg/L、以600 r/min的速度搅拌90 s,静置30 min。此时,萃余水相中煤油含量可由450.0 mg/L下降到63.0 mg/L,去除率为85.90%。The key technique of recovering rare earths from their solution with low concentration by solvent extraction is how to reduce the organic phase loss originated from water - solubility and emulsification or lower the oil content in raffinate a- queous phase. In this paper, a simple method for the determination of kerosene content in water was established and used to study the influence of A/O, oscillating intensity and time, phase separating time on the oil content of P507 - kerosene raffinate aqueous phase. It was found that the kerosene content in raffinate aqueous phase only decreased with prolonging phase separa- ting time and lower phase ratio A/O. Furthermore, an aluminium sulphate coagulation method was employed to remove the kerosene in raffinate aqueous phase, and the effects of coagulation conditions on kerosene removal rate were evaluated. The re- sults showed that the kerosene removal rate reaches more then 86% （ dropped from 450mg/L to 63mg/L） under the optimal conditions with Al3＋ dosage of 120.0mg/L, initial pH 9.4, stirring intensity 600r/min, stirring time 90s, setting time 30min.

关 键 词：P507 低浓度稀土溶液 萃取 除油 

分 类 号：O614.33[理学—无机化学] X703[理学—化学]