摘要
目前应用于铜浸出液中铜与钙等杂质的分离的溶剂萃取法是工业上应用最广、成熟度较高的方法,仍然存在萃取率低、铜与杂质分离系数低、萃取平衡时间长、反萃困难等问题。因此,本文将磷酸三丁酯(TBP,T)和(2-乙基己基)磷酸单-2-乙基己基酯(P507,HP)组成的协同萃取体系应用于含铜酸性溶液中钙、锌的除杂,考察萃取体系组成、萃取时间、萃取温度、萃取相比(V_(O)/V_(A))、氯离子浓度等因素对钙、锌萃取分离性能的影响。结果表明:该萃取体系相比于单一萃取剂能够同时选择性地萃取钙、锌,并显著提高了铜与钙、锌的萃取分离系数。在协同萃取剂TBP-P507总浓度为1.5 mol/L、TBP摩尔比为0.4、萃取时间5min、萃取温度30℃、V_(O)/V_(A)=2/1、水相中氯离子总浓度为4mol/L的条件下,钙、锌萃取率分别为94.69%和85.20%,而铜萃取率仅为2.56%,此时钙铜、锌铜分离系数分别为570.81和188.26。斜率法研究结果表明钙、锌萃合物组成可能为{M·2[T]_((o))·2[P]_((o))}(其中M代表Ca和Zn)。
At present,the solvent extraction method,which is the most widely used and highly mature purification separation method in industry,still faces problems such as low extraction rate,low separation coefficient between copper and impurities,long extraction equilibrium time,and difficulty in reverse extraction in the separation of calcium and other impurities in copper leaching solution.Therefore,this article proposed to apply a synergistic extraction system composed of tributyl phosphate(TBP,T)and(2-ethylhexyl)phosphate mono-2-ethylhexyl ester(P507,HP)to the extraction and separation of calcium and zinc in acidic solutions containing copper.The effect of factors such as extraction system composition,extraction time,extraction temperature,extraction ratio(V_(O)/V_(A)),and chloride ion concentration on the extraction rate of calcium and zinc was studied.The results indicated that the synergistic extraction system could selectively extract calcium and zinc simultaneously and significantly improve the extraction separation coefficient of copper and calcium and zinc compared with a single extraction agent.Under the conditions of a total concentration of 1.5 mol/L TBP-P507 in the synergistic extraction system,a TBP molar ratio of 0.4,extraction time of 5 min,extraction temperature of 30℃,V_(O)/V_(A)=2/1,and a total chloride ion concentration of 4 mol/L in the aqueous phase,the extraction rates of calcium and zinc were 94.69 and 85.20 while the copper extraction rate was only 2.56%.At this time,the separation coefficients of calcium copper and zinc copper were 680.47 and 219.46,respectively.The slope method research results indicated that the composition of the calcium zinc extraction complex might be{M·2[T]_((o))·2[P]_((o))}(where M represents Ca and Zn).
作者
朱山
龙淼
胡久刚
李松
胡江良
ZHU Shan;LONG Miao;HU Jiugang;LI Song;HU Jiangiang(School of Chemistry and Materials Engineering,Liupanshui Normal University,Liupanshui 553000,Guizhou,China;College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)
出处
《有色金属科学与工程》
CAS
北大核心
2024年第6期848-855,共8页
Nonferrous Metals Science and Engineering
基金
六盘水师范学院培育项目(LPSSY2023KJZDPY05)
六盘水市科技局项目(52020-2023-0-2-17)
贵州省教育厅自然科学研究重点领域项目(黔教合KY字[2020]049)
贵州省六盘水师范学院院士工作站项目(黔科合平台人才[2019]5604号)
贵州省煤炭洁净利用重点实验室项目(黔科合平台人才[2020]2001)
贵州省一流专业项目(GZSylzy202103)
贵州省高等学校煤炭产业碳中和工程研究中心(黔教技[2023]044号)
贵州省教育厅项目(黔教技[2023]087号)。
关键词
钙锌萃取分离
TBP
P507
萃取工艺优化
萃合物组成
extraction separation of calcium and zinc
TBP
P507
extraction process optimization
composition of extracted complex
作者简介
通信作者:朱山(1989-),博士,教授,主要从事溶剂萃取及其机理方面的研究。E-mail:zhushan19890830@163.com。
