An experimental investigation was presented on the separation of Cu（Ⅱ）, Zn（Ⅱ）, and Cd（Ⅱ） from a rich sulfate leachate of zinc slag by solvent extraction. The results of orthogonal experiments indicate that LI...An experimental investigation was presented on the separation of Cu（Ⅱ）, Zn（Ⅱ）, and Cd（Ⅱ） from a rich sulfate leachate of zinc slag by solvent extraction. The results of orthogonal experiments indicate that LIX 984N is highly selective and very efficient in the extraction of Cu（Ⅱ）, and the analysis of variance indicates that the sequence of parameters according to their influence on the separation efficiency is phase ratio 〉 LIX 984N concentration 〉 pH value 〉 extraction time. The optimal condition for copper extraction is obtained as 25% of LIX 984N concentration, 7 rain of extraction time, 3：2 of phase ratio O/A, and pH = 1.7. The separation of Zn（Ⅱ） and Cd（Ⅱ） was performed after the copper extraction from the raffinate. Comparative analysis of the separation with di-2-ethylhexyl phosphoric acid （D2EHPA）, D2EHPA-tributyl- phosophate （TBP） synergistic extracting system, and 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester （HEHEHP） was made at pH = 2.0. It is demonstrated that the extraction efficiency with D2EHPA is improved after being saponified by sodium hydroxide, and D2EHPA-TBP synergistic extracting, as well as HEHEHP, has a superior selectivity to Zn（Ⅱ） over Cd（Ⅱ）.展开更多
铜溶剂萃取时,萃取剂与硫酸溶液接触将促发其降解。研究羟肟萃取剂LIX984N的酸解行为及其对萃取分相性能的影响。结果表明:酸降解使肟基结构破坏,LIX984N中5-壬基水杨醛肟降解生成2-羟基-5-壬基苯甲醛、2-羟基-5-壬基乙酰苯酮肟降解生...铜溶剂萃取时,萃取剂与硫酸溶液接触将促发其降解。研究羟肟萃取剂LIX984N的酸解行为及其对萃取分相性能的影响。结果表明:酸降解使肟基结构破坏,LIX984N中5-壬基水杨醛肟降解生成2-羟基-5-壬基苯甲醛、2-羟基-5-壬基乙酰苯酮肟降解生成2-羟基-5-壬基苯甲酮;有机相与浓硫酸溶液接触30 h后,萃余液表面张力从56.4 m N/m降至38.1 m N/m,铜萃取分相速率明显降低,萃余液中有机相夹带量、溶解量显著增大,有机相流失现象加重。研究发现夹带是萃余液中有机相流失的主要形式,接触50 h时夹带量在有机相流失总量中占61%。展开更多
研究了N902/煤油从氨/氯化铵水溶液中萃取铜.考察了萃取时间、水相pH值、萃取剂浓度、温度等对萃取率的影响,以及酸度和时间对铜的反萃率的影响.实验发现,在研究的条件下萃取5 m in达到平衡,而反萃则需要15 m in达到平衡.萃取过程是吸...研究了N902/煤油从氨/氯化铵水溶液中萃取铜.考察了萃取时间、水相pH值、萃取剂浓度、温度等对萃取率的影响,以及酸度和时间对铜的反萃率的影响.实验发现,在研究的条件下萃取5 m in达到平衡,而反萃则需要15 m in达到平衡.萃取过程是吸热过程,测得△H=4.0 kJ/mol.在实验范围内,萃取率先随pH值增大而增加,当pH值超过10.2后,随着pH值增大反而降低.展开更多
文摘An experimental investigation was presented on the separation of Cu（Ⅱ）, Zn（Ⅱ）, and Cd（Ⅱ） from a rich sulfate leachate of zinc slag by solvent extraction. The results of orthogonal experiments indicate that LIX 984N is highly selective and very efficient in the extraction of Cu（Ⅱ）, and the analysis of variance indicates that the sequence of parameters according to their influence on the separation efficiency is phase ratio 〉 LIX 984N concentration 〉 pH value 〉 extraction time. The optimal condition for copper extraction is obtained as 25% of LIX 984N concentration, 7 rain of extraction time, 3：2 of phase ratio O/A, and pH = 1.7. The separation of Zn（Ⅱ） and Cd（Ⅱ） was performed after the copper extraction from the raffinate. Comparative analysis of the separation with di-2-ethylhexyl phosphoric acid （D2EHPA）, D2EHPA-tributyl- phosophate （TBP） synergistic extracting system, and 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester （HEHEHP） was made at pH = 2.0. It is demonstrated that the extraction efficiency with D2EHPA is improved after being saponified by sodium hydroxide, and D2EHPA-TBP synergistic extracting, as well as HEHEHP, has a superior selectivity to Zn（Ⅱ） over Cd（Ⅱ）.
文摘铜溶剂萃取时,萃取剂与硫酸溶液接触将促发其降解。研究羟肟萃取剂LIX984N的酸解行为及其对萃取分相性能的影响。结果表明:酸降解使肟基结构破坏,LIX984N中5-壬基水杨醛肟降解生成2-羟基-5-壬基苯甲醛、2-羟基-5-壬基乙酰苯酮肟降解生成2-羟基-5-壬基苯甲酮;有机相与浓硫酸溶液接触30 h后,萃余液表面张力从56.4 m N/m降至38.1 m N/m,铜萃取分相速率明显降低,萃余液中有机相夹带量、溶解量显著增大,有机相流失现象加重。研究发现夹带是萃余液中有机相流失的主要形式,接触50 h时夹带量在有机相流失总量中占61%。
文摘研究了N902/煤油从氨/氯化铵水溶液中萃取铜.考察了萃取时间、水相pH值、萃取剂浓度、温度等对萃取率的影响,以及酸度和时间对铜的反萃率的影响.实验发现,在研究的条件下萃取5 m in达到平衡,而反萃则需要15 m in达到平衡.萃取过程是吸热过程,测得△H=4.0 kJ/mol.在实验范围内,萃取率先随pH值增大而增加,当pH值超过10.2后,随着pH值增大反而降低.
