Abstract

In the present study, the recovery of Cu²⁺ from the resulting actual leach solution after the leaching of malachite ore in perchloric acid solutions was examined by applying the solvent extraction method. The organic phase was prepared using Acorga M5640 and kerosene. The effects of the initial pH of solution, extractant concentration, Cu²⁺ concentration, temperature, and stirring speed on the extraction process were investigated. It was determined that the extraction yield increased with an increase in the extractant concentration, initial pH of aqueous solution, stirring speed, and temperature, and with a decrease in the concentration of Cu²⁺. To prevent or minimize Zn²⁺ transfer to the organic phase and to ensure maximum Cu²⁺ extraction from the aqueous phase, the optimal values for the initial pH of the aqueous phase, initial concentration of Cu²⁺, extractant concentration, temperature, and stirring speed were selected to be 1, 0.152 g/L, 4% (v/v), 25 °C, and 400 rpm, respectively. The stoichiometry and mechanism of the extraction process were determined applying the equilibrium slope method. The changes in the Gibbs free energy, enthalpy, and entropy were determined. The changes in these thermodynamic parameters were calculated to be − 3.87 kJ/mol, 64.67 kJ/mol, and 0.23 kJ/(mol K), respectively.

Graphical Abstract

The extraction percentage of Cu²⁺ increases substantially when the initial pH of the leach solution increases from 0.1 to 1. The further increase in the initial pH above 1 does not create an increase in the extraction extent of Cu²⁺. When the initial pH of the leach solution is higher than 1, the amount of Zn²⁺ transferred from the aqueous phase to the organic phase increases significantly.

中文翻译：

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在高氯酸溶液中浸出孔雀石矿石后，Acorga M5640回收铜（II）

摘要

在本研究中，通过应用溶剂萃取法研究了孔雀石矿石在高氯酸溶液中浸出后，从所得的实际浸出溶液中回收Cu ^2+的方法。使用Acorga M5640和煤油制备有机相。研究了溶液的初始pH，萃取剂浓度，Cu ²⁺浓度，温度和搅拌速度对萃取过程的影响。可以确定，随着萃取剂浓度，水溶液的初始pH，搅拌速度和温度的增加以及Cu ²⁺浓度的降低，萃取产率增加。为了防止或最小化Zn ²⁺向有机相的转移并确保最大的Cu含量从水相中进行²⁺萃取，水相初始pH，Cu ²⁺初始浓度，萃取剂浓度，温度和搅拌速度的最佳选择为1,0.152 g / L，4％（v / v），25°C和400 rpm。采用平衡斜率法确定了萃取过程的化学计量和机理。确定了吉布斯自由能，焓和熵的变化。这些热力学参数的变化分别计算为-3.87 kJ / mol，64.67 kJ / mol和0.23 kJ /（mol K）。

图形概要

当浸提溶液的初始pH从0.1增加到1时 ，Cu ²⁺的萃取百分比显着增加。初始pH高于1的进一步增加不会导致Cu ²⁺的萃取程度的增加。当浸提溶液的初始pH高于1时，从水相转移至有机相的Zn ²⁺的量显着增加。