异辛醇对Lix984NC萃取铜性能的影响

本文研究了异辛醇对Lix984NC萃取性能的影响。研究结果表明：添加异辛醇能够显著的改善有机相的分相性，能够显著提高萃取和反萃过程的分相速率；会明显降低铜的萃取能力，会显著提升铜的反萃能力和铜铁选择性能，但添加量较多会显著影响净铜转移量，经过研究当添加2%左右的异辛醇时能够达到较好的萃取性能和分相。经过工业试验中，异辛醇能够显著的改分相性能，减少有机相夹带现象，对减少铁的转移和提升铜的萃取有一定的帮助；但添加异辛醇会著促进Lix984NC的水解讲解，不能改善Lix984NC抗氧化性能。     

稀释剂物化性质对羟肟萃取剂萃取铜性能的影响

研究了稀释剂的物化性质对羟肟萃取剂萃取铜的性能的影响。结果表明:稀释剂黏度、密度和表面张力等物化指标对羟肟萃取剂萃取铜的动力学、反萃取动力学、铜铁选择性和分相指标都有较大影响;萃取生产中选择适宜稀释剂对溶剂萃取过程有重要意义。     

金属萃取剂Mextral 84H萃取铜的性能研究

研究了Mextral 84H萃取剂萃取铜的性能及影响因素。结果表明:Mextral 84H萃取剂具有萃取效率高、分相速度快、使用寿命长等特点,可用于从矿石浸出液或印刷线路板蚀刻液中萃取铜。     

TBP对有机胺协萃体系萃镍性能的影响

选取一种自制有机胺和协萃剂的复配萃取体系从红土镍矿模拟硫酸浸出液中回收镍,考察了各组分比例、改性剂TBP加入量、萃取剂总浓度、萃取时间、萃取温度等对镍的萃取率、除杂率、萃取分相时间及反萃分相时间的影响。结果表明,TBP的加入能极大缩短反萃分相时间,同时对除杂率与萃取分相时间没有太大影响,镍饱和萃取容量略有降低。当萃取剂各组分摩尔浓度为有机胺∶协萃剂∶改性剂=0.9mol/L∶0.45mol/L∶0.9mol/L时,镍饱和萃取容量达6.9g/L。萃取温度的升高有利于缩短萃取分相时间,但是镍的萃取率略有下降。在萃取相比O/A=1/2、30℃萃取20min时,镍的5级逆流萃取率可达98%以上。     

Lix984NC与Mextral984NC萃取剂萃铜性能对比研究北大核心

对Lix984NC和Mextral984NC两种萃取剂的萃铜性能进行对比。试验考察了萃取剂浓度对萃铜效果的影响,绘制了两种萃取剂的萃铜等温线,并采用180 g/L的硫酸溶液反萃负载铜有机相。试验结果表明:当Lix984NC和Mextral984NC剂浓度相同时,其单级萃铜能力相同;萃取剂浓度为30%时,Lix984NC萃铜饱和容量略高于Mextral984NC,但Mextral984NC的分相性能优于Lix984NC。当浸出液中铜浓度为6~7 g/L时,连续运转中试试验结果两种萃取剂萃铜性能相差不大。     

金属萃取剂Mextral(R)CLX-50的合成和萃取铜的性能研究

合成了一种吡啶羧酸酯萃取剂Mextral(R)CLX-50,用于从酸性蚀刻液中萃取铜.Mextral(R)CLX-50中,有效成分吡啶羧酸酯质量分数为50％,在40℃条件下从蚀刻液中萃取铜,分相性能较好,一级萃取铜负载量可达20～30 g/L；用水可将负载有机相中的铜反萃取下来,反萃取率超过90％.     

新型铜萃取剂KM的性能研究

采用国产化原料合成了新型铜萃取剂KM ,并与进口产品M 5 6 40进行了萃取性能的测试对比。结果显示 :KM具有较高的铜负载能力 ;较好的铜铁选择性 ;萃取与反萃分相时间都小于 6 0s;反萃率在 88%以上。     

Lix984NC与Mextral984NC萃取剂萃铜性能对比研究

对Lix984NC和Mextral984NC两种萃取剂的萃铜性能进行对比。试验考察了萃取剂浓度对萃铜效果的影响,绘制了两种萃取剂的萃铜等温线,并采用180 g/L的硫酸溶液反萃负载铜有机相。试验结果表明:当Lix984NC和Mextral984NC剂浓度相同时,其单级萃铜能力相同;萃取剂浓度为30%时,Lix984NC萃铜饱和容量略高于Mextral984NC,但Mextral984NC的分相性能优于Lix984NC。当浸出液中铜浓度为6~7 g/L时,连续运转中试试验结果两种萃取剂萃铜性能相差不大。     

硝酸根和高锰酸根对铜萃取剂降解作用的影响

研究了铜萃取剂醛肟和酮肟在NO-3和MnO-4作用下的萃取能力和分相性能,考察了改质剂2,2,4-三甲基-1,3-戊二醇二异丁酯(TXIB)、异十三醇(TDA)和壬基酚(NP)对醛肟和酮肟抗NO-3和MnO-4氧化作用的能力。结果表明:在NO-3和MnO-4作用下,萃取剂的降解速度明显加快,萃取能力迅速下降,分相性能很快变差;改质剂NP和TDA的加入可改善萃取剂的抗氧化能力,但TXIB几乎无抗氧化作用。     

浸出液中聚丙烯酰胺对铜溶剂萃取的影响

研究了铜浸出液中的聚丙烯酰胺对铜溶剂萃取的影响,发现浸出液中的聚丙烯酰胺会增加浸出液的粘度和萃余液中的有机相夹带、降低萃取过程的分相速度和动力学性质。浸出液中聚丙烯酰胺浓度越高,对铜溶剂萃取的影响就越大。聚丙烯酰胺的影响随其分子量和离子度的增加而增大。不同结构的聚丙烯酰胺对铜溶剂萃取的影响也不同。水相连续时聚丙烯酰胺对分相的影响比有机相连续时大。浸出液中聚丙烯酰胺的浓度小于0.01%(w/w)时,对铜溶剂萃取的影响很小。     

萃取－旋流电积工艺从镓锗浸出液中生产阴极铜

介绍了某冶炼厂采用萃取－旋流电积工艺从镓锗浸出液中生产阴极铜的工业化应用情况。在铜的萃取生产过程中,通过优化反萃液酸度、萃取温度,同时监控浸出液中有害杂质含量和增设活性白土有机相净化装置,有效解决了铜萃取率低、分相慢和萃取有机相降解等技术问题;在铜的旋流电积生产中,采用钛基二氧化铅阳极替代钛基贵金属阳极、溶气泵加气浮澄清除油装置替换二级纤维改性材料除油装置,通过铜离子浓度电积终点准确控制、古尔胶助剂添加量、铜电积循环液温度优化,解决了阴极铜析出质量差、钛基贵金属阳极损耗大等生产难题,阴极铜的质量和阳极寿命均得到明显改善。     

Extraction of copper from acidic leach solution with Acorga M5640 using a pulsed sieve plate column

The extraction of copper from acidic leach solution with the aldoxime Acorga M5640 using a pulsed sieve plate column has been investigated. The pregnant leach solution was produced through pressure leaching of an industrial sphalerite concentrate that contained zinc, iron, copper, indium and other minor elements. Bench scale studies on solvent extraction have been carried out for selecting the composition of the organic phase and the pH of the leach solution to perform the separation of copper. An organic phase with 10% (v/v) Acorga M5640 and 2.5% (v/v) isotridecanol was chosen to test the hydrodynamic and mass transfer performance of the extraction column. The results of the pilot plant experiments demonstrated the feasibility of operating the extraction of copper from the aqueous solution using a pulsed sieve plate column.     

Evaluation and selection of extractants for the separation of copper and zinc from chloride leach liquor

The paper describes the bench-scale studies on the solvent extraction separation of copper and zinc from chloride liquors resulting from the low temperature chlorination of a lead-zinc sulphide concentrate. Various possible extractants were evaluated and the selection of the most suitable reagent was based on the effect of total chloride and equilibrium pH on extraction and discrimination, scrubbing and stripping. Acorga P5300 was the most suitable extractant for copper and TBP was selected for zinc.     

The extraction of copper from dilute aqueous solutions using a liquid membrane process

A liquid surfactant membrane process is considered for the separation of copper ions from dilute aqueous solutions. The process is shown to work effectively, solutions ranging in concentrations from 2000 ppm copper as copper sulphate (typical of acid leach solutions) down to 100 ppm copper have been successfully processed. In the case of the very dilute solutions the copper concentration in the final raffinate can be taken down to less than 1 ppm in a single contact stage. The liquid membrane is made up of a chelating agent, in this work Shell SME 529, organic diluent and emulsifying agent. Factors influencing mass transfer, such as membrane composition, O/A ratio, pH of the aqueous feed solution and acid content of the strip solution, contacting condition etc., have been studied. Providing membrane breakdown is low the process can be represented as a pseudo first order rate process. It is shown that by using this form of facilitated transport transfer of copper ions against very adverse concentration gradients across the membrane can be achieved. Further pilot plant work is required to examine scale up features of this process. Compared with conventional solvent extraction the amount of solvent (reagent and diluent) required in the contacting stage(s) is very much reduced. In this work it is shown that successful extraction of copper can be achieved using over two orders of magnitude less solvent than with solvent extraction.     

镍精矿加压酸浸新工艺研究

研究了金川镍精矿加压一步全浸镍、钴、铜新工艺,浸出液中和除铜后萃取分离镍钴,镍、钴、铜的浸出率可分别达到99.5%、98%和98%以上。该工艺与硫酸选择性浸出相比具有金属浸出率高、分离彻底、易分别回收等优点。     

稀释剂改性对萃取分相性能的影响

用气相色谱－质谱联用分析仪鉴别了萃取界面污物中有机相的化学成分，发现其中 萃取剂降解产物和甲基萘、二甲基萘、三甲基萘等稠环芳烃，稀释剂260＃工业煤油中由于含有稠环芳烃及其它杂质而使萃取分相性能变坏。通过适当的磺化方法可使衡释剂的物化性能和分相性能以改善，最终达到防止乳化的目的。     

一种从废旧电路板中回收铜的新工艺

介绍了一种从废旧电路板中分离提取铜并产出超细铜粉的新工艺。首先采用物理分选法分离出含铜的重密度组分,之后采用氧化氨浸—溶剂萃取工艺获得CuSO4溶液,最后以次亚磷酸钠为还原剂,以PVP为保护剂和分散剂,采用二次还原法,获得粒度1.5μm左右的抗氧化铜粉。浸出阶段优化条件为:温度35℃,时间2h,氨水和硫酸铵起始浓度均为2mol/L,空气流量8m3/h,固液质量体积比1∶10。铜萃取及反萃阶段优化条件为:萃取剂Lix84,萃取剂体积分数50%,相比1∶1,TBP浓度0.1mol/L,常温,以500次/min的速度震荡3min;反萃取剂硫酸,浓度0.2mol/L。在优化条件下,浸出、萃取及反萃取阶段的铜提取率分别为96.67%、98.87%及93.34%,效果良好。     

多金属结核氨浸液中镍钴铜的萃取分离

采用LIX84从氨性溶液中萃取分离镍、钴、铜。首先采用 5级逆流共萃铜、镍 ,钴留在萃余液中 ,含铜、镍的负载有机相经二级洗涤氨 ;用镍电解废液进行 7级逆流选择性反萃镍 ,实现镍与铜的初步分离 ;然后从含铜有机相中反萃铜得到纯净的硫酸铜溶液 ,选择性反萃镍得到含有少量铜的粗镍液 ,该液仍采用LIX84萃取脱铜 ,并回收铜 ,从而将铜、镍彻底分离 ,实现了用一种萃取剂分离氨浸液中的镍、钴、铜。联动连续运转试验结果表明 ,采用本研究确定的萃取工艺流程和萃取设备处理氨浸液 ,萃取分离效果好 ,试验结果稳定、可靠。金属回收率高 ,萃取回收率分别为 ( %) :Ni 99 0 ,Co 99 7,Cu 99 9。     

Solvent Extraction of Copper from Sulfate–Chloride Solutions Using LIX 84-IC and LIX 860-IC

ABSTRACT

The effect of chloride ions on the copper extraction equilibria, the rate of extraction, copper/iron selectivity, and chloride extraction was studied for organic phases containing pure ketoxime (LIX 84-IC) and pure nonylaldoxime (LIX 860N-IC). In these systems, the used aqueous phase contained total chloride concentrations from 0 to 110 g/l. It was determined that the chloride ions in the aqueous solution had a large negative effect on the extraction equilibria for LIX 84-IC and a small effect for LIX 860N-IC. This deleterious effect is attributed to an increase in the hydrogen ion activity coefficient in the presence of chloride ions. The chloride accelerated the rate of copper extraction even though the reaction was fast in all the tested conditions. An increase in the temperature from 25°C to 35°C affected positively the extraction equilibria for LIX 84-IC.     

用低品位铜矿石浸出液制备硫酸铜溶液

采用溶剂萃取法将低品位铜矿浸出液转化成高浓度硫酸铜溶液。分析了影响萃取及反萃取取的因素,获得了较佳工艺条件。