| D2EHPA溶剂萃取除钙研究 |
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| 引用本文： | 李坤,龙光明,王树轩.D2EHPA溶剂萃取除钙研究[J].盐湖研究,2007,15(3):37-42. |
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| 作者姓名： | 李坤 龙光明 王树轩 |
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| 作者单位： | 1. 中国科学院青海盐湖研究所,青海,西宁,810008;中国科学院研究生院,北京,100039
2. 中国科学院青海盐湖研究所,青海,西宁,810008 |
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| 摘 要： | 研究采用D2EHPA(二-(2-已基己基)磷酸)为萃取剂的溶剂萃取法,在制备高纯碳酸锶工艺中的除钙问题。考察了萃取平衡时间、稀释剂、平衡pH值、温度、水相钙离子浓度、萃取剂浓度等因素对钙萃取率的影响,并研究了反萃条件及溶剂萃取除钙过程中锶的损失率。结果表明,D2EHPA(二-(2-已基己基)磷酸)-磺化煤油体系是除钙的优良萃取体系;萃取平衡时间在1 min左右;在平衡pH值为2.3~2.7的范围内,分配系数与pH值的关系为logD=2.0985pH-5.0215,钙的饱和萃取率达到83%;萃取过程的热效应很小,萃取率与萃取剂浓度的关系为logD=1.7312logCH2A2+2.5116;萃取过程符合液体离子交换机理,萃取络合物的组成为CaA2.1.4624H2A2;在粗碳酸锶盐酸浸取并除钡、铁杂质后的溶液中,D2EHPA(二-(2-已基己基)磷酸)-磺化煤油体系对钙的一次萃取率为46.11%,锶的损失率仅为0.35%,采用逆流多级萃取,可以完全除去其中的钙,得到高纯的氯化锶溶液。
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| 关 键 词： | D2EHPA-磺化煤油 除钙 溶剂萃取 高纯碳酸锶 |
| 文章编号： | 1008-858X（2007）03-0037-06 |
| 修稿时间： | 2007-04-03 |
Study on Removal of Calcium by Solvent Extraction with D2EHPA |
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| LI Kun,LONG Guang-ming,WANG Shu-xuan.Study on Removal of Calcium by Solvent Extraction with D2EHPA[J].Journal of Salt Lake Research,2007,15(3):37-42. |
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| Authors: | LI Kun LONG Guang-ming WANG Shu-xuan |
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| Institution: | 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China; 2. Graduate University of Chinese Academy of Sciences, Beijing , 100039, China |
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| Abstract: | The calcium removal by solvent extraction with D2EHPA in the process of preparing high purity strontium carbonate was investigated in this paper,focusing on the effects of extraction time,diluent,pH,temperature,concentrations of calcium and extractant,et al.on the extraction ratio.The conditions of back extraction and loss ratio of strontium in the process of calcium removal were also investigated.The results show that D2EHPA-sulfonated kerosene extraction system is a good choice for calcium removal.Under the conditions of equilibrium time 1 min and pH 2.3～2.7,the saturated extraction ratio of calcium can reach 83%.The relationship of the distribution coefficient and pH can be represented by logD=2.098 5pH-5.021 5,while the relationship of the extraction ratio and extractant concentration can be represented by the equation of logD=1.731 2 logCH2A2+2.511 6.There exists little △H in the extraction process which coincides with the liquid ion-exchange mechanism.The composition of the extraction complex can be shown as CaA2·1.462 4H2A2.In the solution of crude strontium carbonate leached by hydrochloric acid and with removal of barium and iron ions,the removal ratio of calcium by D2EHPA-sulfonated kerosene can reach 46.11% by once extraction with loss ratio of strontium only 0.35%.High purity strontium chloride with calcium completely removed can be obtained by multiple-stage counter-current extraction. |
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| Keywords: | D2EHPA-sulfonated kerosene Calcium removal Solvent extraction High purity strontium carbonate |
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