摘要
采用水洗法脱除P507-N235体系复合有机相含有的残留酸,结果表明,相比及水温对酸的脱除效果均有影响,相比O/A越小越好,水温应控制在70℃以上。要实现复合有机相的循环使用,应控制残留酸度小于0.1 mol·L-1。此时的有机相与新配有机相萃取稀土效果基本一致。逆流和错流串级模拟洗酸实验表明,逆流洗酸很难将残留酸洗至0.1 mol·L-1以下,当逆流洗涤级数大于20级时,有机相残留酸度仅降至0.2 mol·L-1以下,而错流洗涤的方式可在O/A=1∶5时,经6级热水洗涤可将残留酸洗至0.1 mol·L-1以下。复合有机相循环使用的实验表明,只要严格控制残留酸度,有机相可实现循环使用,且稀土的分配比和分离系数稳定,效果良好,萃取性能并不会随使用次数增加而下降。
Water washing was used to remove the residual acid from complex organic phase of PS07-N235 system. It was found that the phase ratio and water temperature beth influenced the removal of residual acid. The phase ratio should be controlled smaller, and the wa- ter temperature should be controlled at above 70 ℃. The concentration of residual acid should be controlled lower than 0.1 mol .L-1, then the complex organic phase could be recycled. Experiment of counter current extraction and cross current extraction showed the re- sidual acid content was difficult to be washed to below 0.1 mol.L-1 by current extraction. While the concentration of residual acid could be controlled below 0.1 mol-L- 1 by cross current extraction when the ratio of organic and water phase was 1：5 and washing-sta- ges was 6. It was found that the organic phase could be recycled when residual acid was strictly controlled. The distribution ratios and separation coefficient of rare earths kept constant as repeatedly reused.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2014年第2期300-305,共6页
Chinese Journal of Rare Metals
基金
国家科技部"863"计划(2012AA061901)资助
