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首页> 外文期刊>Journal of King Saud University >Solvent extraction of Pb(II) and Zn(II) from a Nigerian galena ore leach liquor by tributylphosphate and bis(2,4,4-trimethylpentyl)phosphinic acid
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Solvent extraction of Pb(II) and Zn(II) from a Nigerian galena ore leach liquor by tributylphosphate and bis(2,4,4-trimethylpentyl)phosphinic acid

机译：磷酸三丁酯和双（2,4,4-三甲基戊基）次膦酸从尼日利亚方铅矿浸出液中溶剂萃取Pb（II）和Zn（II）

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Physico-chemical conditions for the optimal separation of Pb(II) and Zn(II) from a galena ore leachate using a combination of tributylphosphate (TBP) and bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex?272) have been investigated. The results of fundamental studies using synthetic solution of Pb(II) showed that the extraction efficiency increased with increasing pH, extractant concentration and temperature. An extraction yield of 92.1 ± 0.2% for Pb(II) at pH 5.0 by 1 mol/L TBP in 100% MIBK and 94.6 ± 0.2% for Zn(II) at pH 3.0 by 0.032 mol/L Cyanex?272 in kerosene was obtained from an initial galena leach liquor containing 1705.1 mg/L Pb, 98.7 mg/L Zn and 130.2 mg/L total iron as major constituents at 25 ± 2 °C at a stirring time of 30 and 25 min, respectively. Iron was also effectively removed by precipitation using 1 mol/L ammoniacal solution at pH 3.5. The stoichiometry of the lead-extractable species was found to be HPbCl 3 ·TBP. Values of 52.7 ± 0.01 kJ mol ?1 , ?5.05 kJ mol ?1 , 159.6 ± 0.01 J K ?1 mol ?1 and 0.127 ± 0.003 M ?2 were calculated for the apparent standard molar enthalpy (Δ H °), Gibb’s free energy (Δ G °), molar entropy (Δ S °) and extraction constant, respectively. About 94.5 ± 0.2% Pb(II) and 94.6 ± 0.2% Zn(II) were stripped from the TBP and Cyanex?272, respectively using 0.1 mol/L HCl solution. Finally, a compact extraction scheme has been provided.
机译：利用磷酸三丁酯（TBP）和双（2,4,4-三甲基戊基）次膦酸（Cyanex？272）的组合从方铅矿浸出液中最佳分离Pb（II）和Zn（II）的物理化学条件被调查。使用Pb（II）合成溶液进行基础研究的结果表明，萃取效率随pH，萃取剂浓度和温度的升高而增加。 100％MIBK中1 mol / L TBP在pH 5.0时Pb（II）的提取率为92.1±0.2％，而在煤油中Cyanex？272在pH 3.0中以0.032 mol / L Zn（II）的提取率为94.6±0.2％从最初的方铅矿浸出液中获得，该浸出液中的主成分分别为1705.1 mg / L的Pb，98.7 mg / L的Zn和130.2 mg / L的总铁，在25±2°C下分别搅拌30分钟和25分钟。通过使用pH值为3.5的1 mol / L氨溶液沉淀也可有效去除铁。发现可提取铅的物质的化学计量为HPbCl 3·TBP。计算表观标准摩尔焓（ΔH°），吉布的自由能的值分别为52.7±0.01 kJ mol α1、1.55 kJ mol α1、159.6±0.01 JKα1molα1和0.127±0.003 Mα2。 （ΔG°），摩尔熵（ΔS°）和萃取常数。使用0.1 mol / L HCl溶液分别从TBP和Cyanex？272汽提了大约94.5±0.2％的Pb（II）和94.6±0.2％的Zn（II）。最后，提供了一种紧凑的提取方案。

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