伍志春
,
于淑秋
,
陈家镛
金属学报
本文报道叔胺(TOA)从硫酸盐介质中萃取Fe(Ⅲ)的机理。研究了萃合物的紫外及红外光谱。根据实验结果提出了萃合物的可能结构形式。认为叔胺只能萃取部分水解的Fe(Ⅲ),而伯、仲胺既能萃取水解形式的Fe(Ⅲ)也能萃取非水解形式的Fe(Ⅲ),不同的条件下两种机理可以同时进行或相互转变。讨论了三类胺萃取Fe(Ⅲ)及硫酸反萃取Fe(Ⅲ)的性能的差别。
关键词:
叔胺
,
extraction
,
iron
,
sulfate
JIANG Tao SU Yuanfu Chemical Engineering Research Center
,
East China University of Chemical Technology
,
Shanghai
,
China
金属学报(英文版)
Studies have been made on the extraction of Zn and Cd by TBP(tri-n-butyl phosphate) from diluent hydrochloric acid solutions of soldium chloride.The experiments show that the species extracted from diluent HCI solutions of NaCl appear to be predominantly ZnCl_2· 2TBP and CdCl_2·2TBP.For Cd,at lower acidities,anionic complexes of the type H_2CdCl_3 are also extracted.As the acidity is increased,H_2CdCl_4 appear to be predominant complexes in organic phase.For Zn,the acidocomplexes of the type HZnCl_3 appear in organ- ic phase after the acidity of solutions reaching a certain value([HCl]>0.1 mol/L). Furthermore,the ultraviolet absorption spectra of both aqueous and organic phases have been studied,and the infrared spectra of the organic phases have been exomined.The extraction mechanism and temperature effect are also discussed.
关键词:
extraction
,
null
,
null
,
null
,
null
,
null
WU Zhichun YU Shuqiu CHEN Jiayong CHEN Chiayung Institute of Chemical Metallurgy
,
Academia Sinica
,
Beijing
,
China
金属学报(英文版)
The tertiary amine can be used to extract Fe(Ⅲ) very effectively in the pH range resulting in partial hydrolysis of Fe~(3+) ions.The iron extracted into the organic phase can be stripped rather easily with dilute H_2SO_4 or even with H_2O.Fe(Ⅲ) is extracted into the tertiary amine sulfate solution in the form of[(R_3NH)_2Fe(OH)(SO_4)_2]_2 complex by adduct formation.Equa- tion was derived to represent the chemical reactions involved during extraction.From the infrared spectrum studies on the extraction species in waxy solid form separated from the so- lution,sulfate group is a bidentate ligand to the iron atom.The extraction species has been considered to contain (FeOH)_2 unit based on the ultra violet spectra.The possible structure of the extraction species has been proposed.
关键词:
tertiary amine
,
null
,
null
,
null
LIU Huizhou
,
YU Shuqiu
,
CHEN Jiayong
,
Institute of Chemical Metallurgy
,
Academia Sinica
,
Beijing
,
China LIU Huizhou
,
Institute of Chemical Metallurgy
,
Academia Sinica
,
Beijing 100080
,
China
金属学报(英文版)
Mechanism of extraction of Fe (III) from sulphate solution by primary amine N1923 and stripping of Fe loaded organic phase with dilute H_2SO_4 was investigated. The organic phase was characterized by FT-IR and photon correlation spectroscopy. The composition of extracted species as well as the content of H_2O in organic phase were determined. The dependence of both the rate of extraction and stripping on the formation of reverse micelle in primary amine (N1923)system has been confirmed. It is shown that the extraction of Fe(III) by primary amine sulphate may be related to the adduct formation or cation exchange reaction under different concentrations of H_2SO_4 in aqueous solution.
关键词:
Fe(III)
,
null
,
null
,
null
鄢瑛
,
欧晓霞
,
张会平
材料导报
doi:10.11896/j.issn.1005-023X.2014.22.004
研究了纳米材料对普洱茶浸提特性的影响规律.首先,对纳米材料的平均粒径及分布进行了表征;对比研究了加入纳米材料前后蒸馏水的阴阳离子组成与浓度、pH值和可溶解性固体总量(TDS)及不同水样的17O-NMR半高峰宽等物化性能;其次,在室温(25℃)考察了不同纳米材料添加量下,普洱荼茶汤中茶多酚含量、氨基酸含量和水浸出物含量随浸提时间的变化关系.实验结果表明:纳米材料平均粒径为95.5 nm,阳离子组成主要为Ca2+.加入纳米材料后,蒸馏水的17 O-NMR半高峰宽由113 Hz减小至53 Hz.加入纳米材料后,茶多酚、氨基酸和水浸出物含量较未加入纳米材料显著提高,且浸出速率明显增加,快速达到动态平衡.
关键词:
纳米材料
,
普洱茶
,
浸提
,
水分子团簇结构
刘成
贵金属
doi:10.3969/j.issn.1004-0676.2009.04.006
将自制的球形超细铜粉,通过球磨改性成为片状铜粉,同时进行化学还原和铜离子萃取,在银氨溶液中置换镀银,使银均匀地沉积在铜的表面,并借助球磨的机械作用使镀层更紧密,包覆更完全.该工艺过程简单,可兼顾成本和性能两方面要求,可一次性制备高性能、低成本的片状镀银铜粉.
关键词:
金属材料
,
镀银铜粉
,
片状
,
萃取
,
抗氧化性
,
导电性
