Abstract

This research investigates the extraction behavior of copper and zinc from the sulfate leachate of a porcelain stone tailings sample with Chemorex CP-150 and D2EHPA in detail. The findings demonstrated that Chemorex had greater ability and selectivity in the extraction of copper, while D2EHPA was better in the extraction of zinc. 97.88% copper and 78.2% zinc were extracted, respectively, with Chemorex and D2EHPA within 10 min contact time at an 1:1 aqueous/organic ratio, 10% (v/v) extractant concentration, and ambient temperature. The appropriate solution pH levels for Chemorex and D2EHPA were found to be 2.5 and 2, respectively. Also, a McCabe–Thiele diagram was drawn and one single-step extraction for copper and a two-stage process for zinc were needed to achieve the highest extraction efficiency. Additionally, the mechanism study indicated the association of ~ 1.5 and 1 mol of Chemorex CP-150 and D2EHPA for the extraction of one mole of Cu and Zn from the leach solution. Moreover, thermodynamic parameters, including ΔH, ΔG and ΔS were found to be 65.29 kJ/mol, 9.83 kJ/mol, and 186.14 J/mol K for copper and − 18.71 kJ/mol, 17.80 kJ/mol, and − 122.53 J/mol K for zinc, respectively, indicating that the extraction process was endothermic for copper and exothermic for zinc.

Graphical Abstract

The effect of contact time, pH, and extractants concentration on the extraction efficiency of Cu and Zn by Chemorex CP-150 and D2EHPA and also the number moles required for extractants

中文翻译：

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用Chemorex CP-150和D2EHPA从瓷尾矿样品中提取的硫酸浸出液中铜和锌的溶剂萃取

摘要

本研究详细研究了用Chemorex CP-150和D2EHPA从瓷石尾矿样品的硫酸盐浸出液中萃取铜和锌的行为。这些发现表明，Chemorex在提取铜方面具有更高的能力和选择性，而D2EHPA在提取锌方面则更好。在10分钟的接触时间内，用Chemorex和D2EHPA分别以1：1的水/有机比，10％（v / v）的萃取剂浓度和环境温度萃取了97.88％的铜和78.2％的锌。发现Chemorex和D2EHPA的合适溶液pH值分别为2.5和2。此外，还绘制了McCabe–Thiele图，并且需要一个铜的单步萃取和一个锌的两步萃取工艺以实现最高的萃取效率。另外，机理研究表明，〜1.5和1摩尔的Chemorex CP-150和D2EHPA可以从浸出溶液中提取一摩尔的铜和锌。此外，发现铜的热力学参数，包括ΔH，ΔG和ΔS分别为65.29 kJ / mol，9.83 kJ / mol和186.14 J / mol K，−18.71 kJ / mol，17.80 kJ / mol和− 122.53 J /。 mol K分别表示锌，表明萃取过程对铜是吸热的，对于锌是放热的。

图形概要

接触时间，pH和萃取剂浓度对Chemorex CP-150和D2EHPA萃取铜和锌的效率以及萃取剂所需摩尔数的影响