烃基-苯并噻唑亚砜从硫脲介质中萃取金的性能研究

研究了正丁基-苯并噻唑亚砜(NBBSO)萃取酸性硫脲介质中Au(I)的性能。用2．3mol／L NBBSO从[Au(I)]=0．200mg／mL,[H^ ]=0．08mol／L的溶液中萃取金,一次萃取率高达95％。NBBSO萃取金速度较快,5min达到萃取平衡,负载有机相用12．5％Na2SO3溶液反萃,反萃率达99．2％。对不同结构的烃基一苯并噻唑亚砜萃取硫脲介质中金的性能进行研究,结果表明亚砜的萃取性能受亚砜配位基团的电子密度和取代基的空间效应影响。     

二烷基亚砜—胺二元系从氰化物溶液中萃取金

研究了二烷基亚矾—胺从氰化物溶液中萃取金的反应中,亚矾和胺的化学结构以及萃取条件对萃金效果的影响。结果表明二烷基亚砜—仲胺体系在适当条件下可从较高pH(10～11)的氰化物溶液中有效地萃取金,并能与大多数共存金属元素达到很好的分离。此外,还具易于反萃的优点,是有应用前景的新型萃取体系。     

用N-正丁基异辛酰胺从Rh-Sn-CI体系中萃取铑

研究了以SnCl2为活化试剂用N-正丁基异辛酰胺(BiOA)从Rh-Sn-CI体系中萃取Rh的性能及机制.结果表明:溶液中未添加SnCl2时,Rh几乎不能被萃取,Rh的萃取率随着溶液中CSh/CRh的值增大而增大,当溶液中CSn/CRh摩尔比达到6以上,CHCI浓度为3 mol·L-1时,用1.5 mol·L-1 TBP-正辛烷体系萃取Rh,经过3min的萃取平衡,Rh的萃取率可达到99%.BiOA和TBP对Rh有协同萃取效应,研究表明萃取反应是以酸性离子缔合机制进行.     

DBC与MSO从碱性氰化液中协同萃取金的研究

研究了在用DBC，MSO及DBC-MSO作萃取剂的碱性氰化液中萃取Au（Ⅰ）的性能。考察丁萃取剂和助萃剂的浓度、相比、萃取时间等因素对Au（Ⅰ）萃取率的影响以及Na2S2O3反萃金的性能。实验表明，在采用某种助萃剂X助的作用下，DBC-MSO体系从碱性氰化液中萃取金的协萃效应较高。在整个组成范围内，协萃系数R均大于1。助萃剂X助对DBC-MSO体系萃金的影响较大，但X助本身不萃金。DBC-MSO体系能快速萃取金，在1min内已基本达到萃取平衡。DBC-MSO协萃体系有望能成为碱性氰化液中萃取金的一项新技术。     

用N503/TBP从碱性氰化液中萃取低浓度金

研究酰胺N503和TBP从碱性氰化液中萃取低浓度Au(Ⅰ),考察N503体积浓度、水相pH值、TBP浓度、NaCl浓度、改性剂种类和相比等因素对萃取率的影响.结果表明:当溶液的pH在7～11范围内,Au(Ⅰ)的萃取率均大于98%;当pH＞11后,Au(Ⅰ)的萃取率显著变小;尽管TBP的浓度对Au(Ⅰ)萃取率的影响较小,但提高TBP浓度可以提高萃取pH50值.对矿山浸出液的萃取结果表明,N503/TBP萃取体系对金具有良好的选择性, 其萃取金属氰配阴离子的由难至易的次序为Fe(CN)64-＞Ni(CN)42-＞Zn(CN)42-＞Cu(CN)32-＞Au(CN)2-.     

胺醇萃取剂N2125萃取金的研究

研究了胺醇萃取剂Ｎ２１２５自盐酸介质中萃取金的性能，萃取率随酸度增高而增大。用等摩尔系列法、饱和法及斜率法测定萃合物组成为（Ｎ２１２５）２ＨＡｕＣｌ４，通过ＩＲ、ＨＮＭＲ波谱探讨萃取金的为离子缔合，氮原子主要参与配位，而－ＯＨ中的氧原子不发生配位。     

用CTAB/TBP体系从碱性氰化液中萃取低浓度Au(I)

以TBP为萃取剂, 用新型的柱状萃取装置对水相中加入与Au(I)等摩尔CTAB(十六烷基三甲基溴化铵)的低浓度氰化金溶液进行了萃取研究, 考察了水相中添加CTAB、有机相TBP的体积、盐析剂NaCl浓度等对TBP萃取Au(I) 性能的影响以及载金有机相中金的反萃取. 结果表明: 在水相中添加CTAB后, TBP对低浓度金的萃取性能大幅度提高; 50.L含金浓度约为10.mg/L的氰化金溶液经3级萃取试验后, 金的萃取率大于95%, 萃余相浓度小于0.5×10-6. 用硫氰化钾对含金浓度约为3.g/L的载金有机相进行了反萃取研究, 当KSCN浓度大于3.mol/L时, 对金的反萃率大于93%.     

用CTAB／TBP体系从碱性氰化液中萃取低浓度Au（Ⅰ）

以TBP为萃取剂, 用新型的柱状萃取装置对水相中加入与Au(I)等摩尔CTAB(十六烷基三甲基溴化铵)的低浓度氰化金溶液进行了萃取研究, 考察了水相中添加CTAB、有机相TBP的体积、盐析剂NaCl浓度等对TBP萃取Au(I) 性能的影响以及载金有机相中金的反萃取. 结果表明 在水相中添加CTAB后, TBP对低浓度金的萃取性能大幅度提高; 50.L含金浓度约为10.mg/L的氰化金溶液经3级萃取试验后, 金的萃取率大于95%, 萃余相浓度小于0.5×10-6. 用硫氰化钾对含金浓度约为3.g/L的载金有机相进行了反萃取研究, 当KSCN浓度大于3.mol/L时, 对金的反萃率大于93%.     

伯胺(N1923)-正辛烷在硫酸体系中萃取和反萃Fe(III)机理的研究SCIEI

对伯胺—正辛烷萃取体系在萃取和反萃过程中有机相组成和水含量的变化用FTIR和光子相关谱进行分析研究。结果表明:伯胺与水相酸作用生成了阳离子型表面活性剂的结构,在有机相中易生成反相胶团。其萃取和反萃过程的实质是反相胶团内外的阳离子交换过程。Fe(Ⅲ)以水合形式萃取入有机相中,Fe(Ⅲ)的水解可能发生在反相胶团的微环境中。     

MECHANISM OF EXTRACTION AND STRIPPING OF Fe(Ⅲ) WITH PRIMARY AMINE N1923 AS EXTRACTANT AND n-OCTANE AS DILUENT

对伯胺—正辛烷萃取体系在萃取和反萃过程中有机相组成和水含量的变化用FTIR和光子相关谱进行分析研究。结果表明:伯胺与水相酸作用生成了阳离子型表面活性剂的结构,在有机相中易生成反相胶团。其萃取和反萃过程的实质是反相胶团内外的阳离子交换过程。Fe(Ⅲ)以水合形式萃取入有机相中,Fe(Ⅲ)的水解可能发生在反相胶团的微环境中。     

水相添加表面活性剂CTAB对TBP萃取低浓度金的影响

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Microscopic mechanism in solvent extraction of Au（CN）2^- by cationic surfactant

1　INTRODUCTIONSince Mooiman, Miller et al[1, 2] reported theirinvestigation in 1983, solvent extraction ofAu(CN)-2 from alkaline cyanide solutions has beenan attractive project. In the recent years, thesestudies have been more and more explored, and therepresentative papers are listed in Refs.[3 17].The solvent extraction of Au(CN)-2 by surfac tant CTMAB(cetyl trimithyl ammonium bromide)has been studied. It is different from the solventextraction of Au(CN…     

Liquid-liquid extraction of Au(I) by Amberlite LA2 and its application to a polymer-immobilized liquid membrane system

The liquid-liquid extraction of Au(I) by Amberlite LA2 (secondary amine) in kerosene from cyanide media has been investigated. The analysis of metal distribution data suggested the formation of R₂NH₂ ⁺Au(CN)₂-species in the organic phase with formation constant log K_ext=6.5 ± 0.03, whereas the use of mixtures of the amine with a solvation extractant (e.g. a phosphine oxide) shifted the gold-pH_1/2 extraction towards more alkaline values. The results obtained on Au(I) distribution have been implemented in a polymerimmobilized liquid membrane system, using NaOH solutions (e.g. 0.01 mol/L) to strip the metal from the organic phase.     

Study on Gold (Ⅰ) Solvent Extraction from Alkaline Cyanide Solution by TBP with Addition of Surfactant

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎ１９７０′ｓ，ｍａｎｙｒｅｓｅａｒｃｈｅｒｓｂｅｇａｎｓｔｕｄｙｏｎｇｏｌｄ（Ⅰ）ｅｘｔｒａｃｔｉｏｎｆｒｏｍａｌｋａｌｉｎｅｃｙａｎｉｄｅｓｏｌｕｔｉｏｎ［１，２］，ｂｕｔｉｔｗａｓｉｎｔｅｒｕｐｔｅｄｄｕｅｔｏｔｈ...     

N235萃取Pt体系产生第三相的影响因素

通过测定叔胺(N235)萃取Pt体系中HCl及H2PtCl6在两相中的分配,测定第三相的电导率、体积和水分含量,研究第三相的形成以及各因素对萃取Pt的影响.结果表明:无论在有机相中有无改性剂TBP存在时,无论c(HCl)init高或低,叔胺萃取H2PtCl6的萃取率均较高,且一级萃取率大于99%;稀释剂的种类影响第三相的体积、电导率和水含量,但不影响对Pt的萃取率;以C12H26为稀释剂逐级萃取Pt时,有机相中Pt的浓度大于 13.21 g/L时,即出现第三相;以磺化煤油为稀释剂时,有机相中Pt浓度可以高达23.72 g/L,但不出现第三相.     

丙酮促进的金纳米棒的光化学生长和溶解(英)

在含有高浓度的 HAuCl4单组份表面活性剂的溶液体系中,研究了由丙酮促进的金纳米棒晶种媒介的光化学生长和溶解。结果表明,在晶种媒介的生长溶液中,当丙酮/生长溶液之比高于0.1/25(V/V)时,高产率的金纳米棒(长径比为3.5,平均直径14 nm)能够快速形成;当丙酮/生长溶液之比等于或低于这一临界值时,在化学陈化阶段已形成的金纳米棒则在紫外光照射下溶解。在溶解过程中,金纳米棒发生一系列的形态变化,包括缩短,形成纳米球和完全溶解。进一步的紫外照射最终使溶液成为无色的初始Au(I)-CTAB络合物溶液状态。     

Molten solvent extraction behavior of trivalent La, Sm, Dy, and Yb with tri-n-butyl phosphate into molten paraffin wax at 60℃

The extraction behavior of La3 , Sm3 , Dy3 , and Yb3 in sodium acetate-acetic acid medium was studied with tri-n-butyl phosphate (TBP) at 60 ~C using paraffin wax as a diluent. The extraction percentage is greater than 85% in the pH range of 6 to 8. The result of slope analysis method indicates that the compositions of the extracted species are different between the light and heavy rare earths. The formula of the extracted species is found to be La(TBP)(OH)(Ac)2 for La3 and Yb(TBP)(OH)3 for Yb3 . The effects of extracting time, the concentration of TBP in the organic phase and salts on the extraction efficiency were also discussed.     

Extraction Separation of Sc(III) and Fe(III) from a Strongly Acidic and Highly Concentrated Ferric Solution by D2EHPA/TBP

The solvent extraction and separation process of Sc(III) and Fe(III) from a strongly acidic and highly concentrated ferric solution using mixtures of di(2-ethylhexyl) phosphate (D2EHPA) and tri-n-butyl phosphate (TBP) in sulfonated kerosene was studied. The effects of various parameters, including D2EHPA concentration, dosage of TBP, and phase ratio, were investigated for the extraction process. The results indicated that the extraction rate of Sc(III) was 99.72% with 1.09% Fe(III) co-extracted after two stages of counter-current extraction under optimal conditions. Moreover, saturation capacity and slope analysis were used to determine the reaction mechanism. Sc(III) is extracted in the form of HSc(SO₄)₂·4HL. Further separation of Sc(III) and Fe(III) was realized in a scrubbing and stripping process. First, 98.67% of the co-extracted iron in the loaded organic phase was scrubbed with a dilute HCl solution by a three-stage counter-current scrubbing. Then, 85.00% of Sc(III) can be stripped efficiently with a 2-mol/L NaOH solution saturated in 1-mol/L NaCl by three-stage cross-current stripping.