摘要
对比研究不同萃取体系下硝酸-磷酸混合溶液中钨的萃取-反萃行为,从萃取效率、分相程度及反萃效率等方面考虑选取仲碳伯胺萃取剂N_(1923)作为钨的萃取剂,系统研究N_(1923)对钨的萃取-反萃行为,确定了最佳的萃取/反萃工艺参数。在最优工艺参数下处理配制含有磷钨酸的硝酸-磷酸混合溶液,即在20%N_(1923)(体积分数)+磺化煤油组成的有机相体系、相比1:1、温度20℃、接触时间10 min的条件下,钨萃取率高达99.9%;反萃率条件为:温度50℃、相比2:1、氨水浓度12.5%(质量分数)、接触时间10 min,钨单级反萃率可达93.5%。在优化条件下萃取硝酸-磷酸混合溶液浸出白钨矿的实际料液,钨的萃取率达到99.9%以上,反萃时通过提高相比和氨水浓度的手段,使反萃液中WO_3浓度提高到200g/L以上,反萃率达到98%以上。
The extraction behavior of tungsten in nitric acid-phosphoric acid mixed solution was examined with different extraction agents. The results indicate that extraction agent secondary amine extractant N_(1923) has a satisfied extraction and stripping efficiency of tungsten. Then, the extracting and stripping process of tungsten by N_(1923) was investigated. During the extracting process, over 99.9% tungsten can be extracted under 20% N_(1923)(volume fraction) in organic phase system, phase ratio 1:1, temperature 20 ℃ and contact time 10 min. During the stripping process, over 93.5% tungsten loaded on organic phase is stripped with 12.5% ammonium hydroxide under the conditions of phase ratio 2:1, temperature 50 ℃ and contact time 10 min. Based on the research of extracting tungsten from simulate leach solution of scheelite concentrates, N_(1923) is used to treat the leach solution of scheelite concentrates which is digested by nitric acid phosphate mixture. The applications show that 99.9% tungsten is extracted and a relatively high concentration of ammonium tungstate solution(WO_3 is over 200 g/L) can be obtained through increasing phase ratio and ammonium hydroxide concentration with a satisfied stripping efficiency of 98%.
引文
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