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中國有色金屬學(xué)報(bào)

ZHONGGUO YOUSEJINSHU XUEBAO

第9卷第4期總第33期 1999年12月

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文章編號：1004-0609(1999)04-0837-04

二(2乙基己基)磷酸和磷酸三丁酯對鈣的協(xié)同萃取機(jī)理

黃秋蓮王開毅古映瑩錢東陳小毅賴德勇

(中南工業(yè)大學(xué)化學(xué)系，長沙 410083)

摘要: 研究了二(2乙基己基)磷酸(HA)以及二(2乙基己基)磷酸和磷酸三丁酯(B) 的磺化煤油溶液從硫酸鹽和氯化物混合溶液中對Ca(Ⅱ)的萃取機(jī)理。研究結(jié)果表明，二(2乙基己基)磷酸和磷酸三丁酯對Ca(Ⅱ)具有協(xié)同萃取效應(yīng)，其萃合物的組成分別為CaA₂ ·4H A和CaA₂·3HA·B。根據(jù)實(shí)驗(yàn)數(shù)據(jù)求算了萃取平衡常數(shù)，它們分別為lgK₁＝－0.4 33和lgK₂=0.282。

關(guān)鍵字: 二(2乙基己基)磷酸；磷酸三丁酯；鈣；協(xié)同萃取

Mechanism on synergistic extraction of Ca(Ⅱ) with di(2-ethylhexyl) phosphate and tributyl phosphate as extractants

Huang qiulian, Wang Kaiyi, Gu Yingying, Qian Dong, Chen Xiaoyi, Lai Deyong

（Department of Chemistry,Central South University of Technology, Changsha 410083, P.R.China）

Abstract:The mechanism on the extraction of Ca(Ⅱ)with di(2-ethylhexyl) phosphate(HA) and mixed solution of di(2-ethylhexyl) phosphate and tributyl phosphate(B) as extractants from sulfate and chloride mixed solution has been investigated. It was found that the formulas of extracted species are CaA₂·4HA and CaA₂·3 HA·B respectively. Their extraction equilibrium constants are lgK₁=-0.433 and lgK₂=0.282.

Key words: di(2-ethylhexyl) phosphate; tributyl phosphate; calcium; synergistic extrcaction

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW