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Recovery of copper from alkaline glycine leach solution using solvent extraction

机译：使用溶剂萃取从碱性甘氨酸浸出溶液中恢复铜

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Glycine solutions in an alkaline environment have been shown to be able to leach copper from its oxide, native and sulfide minerals as a copper glycinate complex. This paper explores the recovery of copper from its aqueous glycinate complexes at alkaline pH through solvent extraction. Solvent extraction of copper from synthetic glycinate liquor (with background sulfate anions) containing 2 g/L Cu has been studied using Mextral 84H (2-hydroxy-5-nonylacetophenone oxime) and Mextral 54-100 (1-benzoyl-2-nonyl ketone) extractants with a kerosene diluent. The effect of different parameters such as pH of aqueous phase, glycine and extractant concentrations, equilibrium time, temperature, extractant loading capacity as well as the concentration of sulphuric acid as stripping reagent were investigated. Over 99.9% Cu was extracted with 5% Mextral 84 H at room temperature at an Aqueous-to-Organic (A:O) ratio of 2:1. Under similar conditions, 95.87% Cu was extracted by 10% Mextral 54-100. HPLC analysis for free glycine indicated that neither extractants take up glycine during the extraction process. Stripping experiments with spent electrolyte solution showed that copper loaded on Mextral 54-100 can be completely stripped in single stage at an O:A ratio of 10:1 while only 79.95% Cu can be stripped from Mextral 84H with same conditions applied. Copper extraction from leachates of malachite and chalcopyrite ore samples was performed in order to validate extraction results from the synthetic solutions. Over 99% copper was extracted from the malachite leachate (containing 2620 mg/L Cu) in a single stage by both 10% Mextral 54-100 (raffinate pH of 9.76) and 5% Mextral 84H (raffinate pH of 10.0) at an O:A of 2:1; with no impurity elements picked up by either extractants. At an O:A ratio of 2:1, single stage copper extraction from chalcopyrite leachate by 10% Mextral 54-100 (raffinate pH of 9.87) was 93.20% and 95.57% by 5% Mextral 84H (raffinate pH of 9.91) with the rejection of all impurity elements other than Zn in the aqueous raffinate. From the chalcopyrite leachate containing 2288 mg/L Cu and 699 mg/L Zn, the Zn co-extraction into the organic phase at an O:A ratio of 1 was found to be 16.5% for Mextral 54-100 whilst Zn co-extraction was not noted with Mextral 841-1 under the alkaline conditions. (C) 2017 Elsevier B.V. All rights reserved.
机译：已显示碱性环境中的甘氨酸溶液能够以铜甘油酸铜复合物从氧化物，天然和硫化物矿物中浸出铜。本文通过溶剂萃取探讨了在碱性pH下从其甘氨酸水溶液中恢复铜。使用Mextral 84H（2-羟基-5-壬基酮酮肟）和Mextral 54-100（1-苯甲酰-2-壬基酮（1-苯甲酰-2-壬基酮）研究了含有2g / l Cu的合成甘油酸液（用背景硫酸盐阴离子）的溶剂萃取含铜的溶剂）用煤油稀释剂萃取剂。研究了不同参数如水相，甘氨酸和萃取剂浓度，平衡时间，温度，萃取剂负载能力以及作为剥离试剂的浓度的效果。在室温下在含水至有机（A：O）的比例为2：1的室温下用5％墨荷兰特84h萃取超过99.9％的Cu。在类似的条件下，95.87％Cu通过10％兆兆54-100提取。游离甘氨酸的HPLC分析表明，避孕剂均未在提取过程中占用甘氨酸。用废电解质溶液剥离实验表明，含有Mextral 54-100上的铜可以在O的单一阶段完全剥离O：比例为10：1，而在含有相同条件的Mextral 84h中只能从Mextral 84h中剥离79.95％Cu。采用孔雀石和黄铜矿矿石样品的铜萃取，以验证来自合成溶液的提取结果。在单一阶段中，通过10％兆文54-100（萃余液pH为9.76）和5％兆升84h（紫酸pH值为10.0），从孔雀沸石渗滤液（含有2620mg / L Cu）中提取超过99％的铜。 ：A为2：1;没有通过萃取剂拾取的杂质元素。在O：比例为2：1，从硫代铜矿渗滤液中的单级铜萃取10％墨镜54-100（萃余液pH为9.87）为93.20％和95.57％，含5％兆克隆84h（紫酸叔次pH为9.91）在含水萃取液中抑制除Zn之外的所有杂质元素。从含有2288mg / L Cu和699mg / L Zn的含氯铜矿渗滤液，Zn在O的有机相中进入有机相：Mextral 54-100的比例为16.5％，而Zn共萃取在碱性条件下没有用Mextral 841-1注意到。 （c）2017 Elsevier B.v.保留所有权利。

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