我国铜溶剂萃取技术的发展

分析了我国铜矿资源的特点，并叙述了铜溶剂萃取技术在我国的发展进程与现状，展望了这项技术对促进我国铜工业发展的广阔前景。列举了近年来投产的一些萃取工厂状况．     

碱性氰化液中萃取金的研究进展

本文全面概述了各种有机胺类、膦氧化物、烷基磷酸酯、二元混合协同萃取剂和胍类液体及树脂萃取剂萃取和反萃取金的体系。二元混合协同萃取比单一萃取剂的萃取效果好。文中描述了胍类树脂萃取剂的试验级和示范级萃取和反萃取试验,并介绍了树脂吸附(RIS)和碳吸附(CIS)用于碱性氰化液中提金的生产及成本。胍类树脂萃取剂因选择性好、耗损少、易反萃,最具有应用价值。     

Separation of Americium from Europium using Camphor-BisTriazinyl Pyridine: A Fundamental Study

Among the different components present in spent nuclear fuel, long-lived trivalent actinides are particularly difficult to separate from the shorter-lived lanthanide fission products due to their similar chemical properties. Selective extraction of americium from acidic solution (up to 2M HNO₃) containing tenth molar quantities of lanthanides has been achieved using neutral pyridine-based ligands dissolved in polar diluents. Nitrogen-based Bis Triazinyl Pyridine (BTP) ligands are desirable for both their excellent An/Ln selectivity and incinerability. Results pertaining to ligand solubility, kinetics, hydrolytic stability, and extraction performance in various nitric acid environments are presented.     

Analysis of the Interaction between Organophosphorus Acid and Tertiary Amine Extractants in the Binary Mixtures by Fourier Transform Infrared Spectroscopy (FT-IR)

In the synergistic solvent extraction of rare earth elements by binary mixtures of organophosphorus acid and tertiary amine extractants, the extraction reaction depends on the nature and strength of the interaction between the two extractants in the mixtures. In order to correlate qualitatively the interaction in different mixtures, the FT-IR spectra for organophosphorus acid (D2EHPA, PC88A, and Cyanex 272) and tertiary amine (Alamine 336 and TEHA) extractants and their mixtures have been analyzed. The primary focus was on investigating the changes in the characteristic functional groups of acidic and amine extractants in the binary mixtures as the strength and concentration of these extractants varied. IR spectroscopy of the organics confirmed the interaction in the binary mixtures, and strength of the interaction increased with the increase in the acidity of acidic extractant and the basicity of the amine extractant.     

湿法冶金中锌的萃取工艺研究进展

本文主要综述了国内外近些年对锌萃取的大量基础性研究,对不同种类的锌萃取剂进行了简要介绍。介绍了近些年热点研究的新的萃取工艺和萃取技术。并对工业上不同的锌的原料的萃取过程和方法进行介绍了相关介绍。对锌萃取工艺的工业应用前景进行了评述。     

Studies on the Separation and Recovery of Uranium from Phosphoric Acid Medium Using a Synergistic Mixture of (2-Ethylhexyl)phosphonic Acid Mono 2-Ethyl Hexyl Ester (PC-88A) and Tri-n-octylphosphine Oxide (TOPO)

This paper deals with studies on the extraction of uranium(VI) from phosphoric acid medium using (2-ethylhexyl)phosphonic acid mono 2-ethylhexyl ester and tri-n-octylphosphine oxide individually as well as from their synergistic mixture. Different extraction parameters were investigated. With an increase in phosphoric acid concentration in the aqueous phase, the distribution ratio (Du) was found to decrease in all the cases. Synergism was observed when a mixture of PC-88A and TOPO was used. The synergistic mixture in the mole ratio of 4:1 (1.80 M PC-88A: 0.45 M TOPO) in xylene was found to be most suitable for uranium extraction. Among the various strip liquors used, 5% (w/v) solution of (NH₄)₂CO₃ was found to be the most suitable. Using a mixture of 1.8 M PC-88A and 0.45 M TOPO as the extractant system and 0.5 M ammonium carbonate as the stripping agent, uranium recovery was found to be better than 97% ± 3% in multiple contacts, (n = 2) from actual Davies Gray Waste while in case of wet phosphoric acid more than 52% ± 3% (n = 3) only could be recovered where n is the number of contacts.     

Studies on the Separation and Recovery of Thorium from Nitric Acid Medium using (2-ethyl hexyl) Phosphonic Acid,Mono (2-ethyl hexyl) Ester (PC88A)/N-Dodecane as Extractant System

This paper deals with the studies on the separation and recovery of thorium and 233-uranium from nitric acid medium using (2-ethyl hexyl) phosphonic acid, mono (2-ethyl hexyl) ester/n-dodecane as an extractant system. The different extraction parameters were investigated. The distribution ratio of thorium decreased with increase in nitric acid concentration. The optimum solvent concentration for quantitative separation of thorium from aqueous feed solution was 0.75 M of PC88A whereas dodecane was the most suitable of diluents with an organic to aqueous phase ratio of 1:1. Among the various strippants used, 2 M solution of (NH₄)₂CO₃ was found to be the most suitable for back extraction of thorium. The developed method was used to recover thorium and ²³³U from radioanalytical waste generated during thorium analysis by ethylene diamine tetraacetic acid (EDTA) titremtric method and recoveries for both Th and U were more than 85%.     

生物丁醇萃取剂回收过程工艺条件的优化

萃取剂回收过程是生物丁醇原位萃取发酵工艺的一个重要过程。萃取剂的经济、有效、安全的回收和循环利用是实施生物丁醇原位萃取发酵工艺的基础,本文针对油醇萃取剂的回收过程进行了研究,对油醇萃取剂回收塔进行了优化模拟计算,并提出萃取剂回收塔优化工艺条件为全塔理论级数10个或以上,塔顶操作压力0.025MPa～0.03MPa,塔釜操作温度宜控制在200℃以内。     

常压下甲醇-碳酸二甲酯汽液平衡测定及其萃取剂选择

甲醇( MeOH)与尿素催化合成碳酸二甲酯的工艺路线是目前最有发展前途的一种合成方法,但该过程中由于使用了过量的甲醇,在合成中形成了碳酸二甲酯和甲醇的共沸物,分离困难.已报道的分离方法中萃取精馏,在经济效益、操作和安全方面都优于其他方法.草酸二甲酯,碳酸乙烯酯,碳酸丙烯酯均可作为萃取精馏分离DMC的萃取剂,但MeOH-...