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首页> 外文期刊>Separation and Purification Technology >Selective extraction and deep removal of tungsten from sodium molybdate solution by primary amine N1 923
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Selective extraction and deep removal of tungsten from sodium molybdate solution by primary amine N1 923

机译：伯胺N1 923从钼酸钠溶液中选择性萃取和深度去除钨

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摘要

Selectively extracting tungsten to purify sodium molybdate solution was studied using primary amine N1923, including various conditions, such as equilibrium pH values, concentrations of extractant in organic phase and metals in feed solution, contact time of extraction and stripping, types of acidic solutions added, temperature of extraction and the dosage of stripping agent. Graphical method using McCabe-Thiele diagram and counter-current extraction simulation (CCES) were used to determine the required stages of deep removal of tungsten. The results show that appropriate concentrations of tungsten and molybdenum in feed solution have great influence on the difficult degree of the separation between the two metals. Organic phase including 0.051 M of N1923 modified by LK-N21X diluted in kerosene can extract 92.7% of tungsten in sulfuric acid solution at equilibrium pH value of 7.07 for 10 min in one-stage extraction at 15.5 °C, and the separation factor reaches 329 under those optimum conditions. A two-stage CCES removes 99.83% of tungsten and obtains the purified sodium molybdate solution where W/Mo (mass ratio) reaches 2.9 x 10~5. Stripping can be accomplished by NaOH solution completely and quickly. Furthermore, the extraction and stripping reactions of tungsten and molybdenum in equilibrium were proposed.
机译：研究了使用伯胺N1923选择性萃取钨以纯化钼酸钠溶液的方法，包括各种条件，例如平衡pH值，萃取剂在有机相中的浓度以及进料溶液中的金属，萃取和汽提的接触时间，添加的酸性溶液的类型，提取温度和脱模剂用量。使用McCabe-Thiele图和逆流萃取模拟（CCES）的图形方法来确定深度去除钨的所需阶段。结果表明，进料溶液中钨和钼的适当浓度对两种金属难以分离的程度有很大的影响。含有0.051 M LK-N21X的煤油稀释的N1923改性的有机相，在15.5°C的一级萃取中，可在平衡pH值为7.07的硫酸溶液中萃取92.7％的钨，历时10分钟，分离系数达到329在那些最佳条件下。两级CCES去除99.83％的钨，得到W / Mo（质量比）达到2.9 x 10〜5的纯钼酸钠溶液。 NaOH溶液可以完全，快速地完成汽提。此外，提出了钨和钼在平衡状态下的萃取和汽提反应。

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