Influence of aluminum ions distribution on the removal of aluminum from rare earth solutions using saponified naphthenic acid
Influence of aluminum ions distribution on the removal of aluminum from rare earth solutions using saponified naphthenic acid
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DOI：
10.1016/j.seppur.2017.05.057
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发表时间：
2017-10
影响因子：
8.6
通讯作者：
Xiuli Yang;T. Qiu
中科院分区：
文献类型：
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作者：
Xiuli Yang;T. Qiu
研究了铝离子分布对皂化环烷酸脱除稀土溶液中铝的影响。研究了萃取方式对铝和稀土萃取率的影响，结果表明，铝对稀土的纯度影响很大。对于铝的去除，利用MatLab软件计算了不同pH值、初始铝浓度为0.15mol/L时铝离子和羟基聚合铝离子的分配分数。得到了铝离子和羟基聚合铝离子的分布分数随pH值的变化曲线。在此基础上，研究了pH值和皂化值对铝和稀土萃取率的影响。结果表明，在无乳化条件下，初始铝浓度为0.15mol/L，pH值为3.0时，铝的萃取率最高。这与铝离子和羟基聚合铝离子的分布是一致的。对于铝浓度较低的溶液，在pH值为3的条件下，皂化值在0.3-0.5之间时，铝和稀土很容易分离。
The present research investigates the effect of aluminum ions distribution on the removal of aluminum from rare earth solutions using saponified naphthenic acid. The effect of extraction type on the extraction rate of aluminum and rare earth was studied and the results indicated that aluminum influences the purity of rare earth seriously. For the removal of aluminum, the distribution fractions of aluminum ions and hydroxyl polymeric aluminum ions at different pH value at 0.15 mol/L initial aluminum concentration were calculated by MATLAB software. The plot of distribution fraction of aluminum ions and hydroxyl polymeric aluminum ions with pH value are obtained. Based on these, the effect of pH value and saponification value on the extraction of aluminum and rare earth were studied. The results show that the extraction rate of aluminum was highest at pH value 3.0 at initial aluminum concentration 0.15 mol/L in the absence of emulsification. This is consistent with the distribution of aluminum ions and hydroxyl polymeric aluminum ions. For the solutions containing low aluminum concentration, it is easy to separate aluminum from rare earth at 0.3–0.5 saponification value at pH value 3.