Solvent Extraction of Manganese and Zinc from Chloride Leach Solution of Spent Zn–C Batteries with DEHPA in Benzene Diluent

IF 2.5 3区材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Journal of Sustainable Metallurgy Pub Date : 2024-03-25 DOI:10.1007/s40831-024-00810-9

Mohamed Taha Osman Abdelraheem, Ali Aras, Hasan Ali Taner, Tevfik Agacayak

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Abstract

The applicability of utilizing solvent extraction processes of manganese (Mn) and zinc (Zn) from chloride leachate of spent zinc–carbon (Zn–C) batteries has been studied by using di-2-ethylhexyl phosphoric acid (DEHPA) as an extractant agent. The effect of five factors (equilibrium pH, O/A ratio, temperature, extractant concentration, and diluent type) were investigated. According to the results gained, the appropriate solution pH level for DEHPA was found to be 6.5. With DEHPA (20%, v/v), 77.50% Mn and 100% Zn were extracted, within 15 min contact time at a 1:1 aqueous/organic ratio and 50 °C temperature. Also, a McCabe–Thiele diagram was drawn and one single-step extraction for Zn and a two-stage process for Mn were needed to achieve the highest extraction efficiency. ΔH as a thermodynamic parameter was calculated and found to be 18.39 kJ/mol for Mn and − 245.50 kJ/mol for Zn, respectively, indicating that the extraction process was endothermic for Mn and exothermic for Zn. A desirable stripping of Mn and Zn from the loaded organic phase could be obtained using a stripping solution of 6 M HCl.

Graphical Abstract

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用苯稀释剂中的 DEHPA 溶剂萃取废锌-C 电池氯化物浸出液中的锰和锌

以二-2-乙基己基磷酸（DEHPA）为萃取剂，研究了利用溶剂萃取工艺从废锌-碳（Zn-C）电池的氯化物浸出液中提取锰（Mn）和锌（Zn）的适用性。研究了五个因素（平衡 pH 值、O/A 比、温度、萃取剂浓度和稀释剂类型）的影响。结果表明，DEHPA 适合的溶液 pH 值为 6.5。在水/有机物比例为 1:1 和温度为 50 °C 的条件下，使用 DEHPA（20%，v/v），在 15 分钟的接触时间内，萃取了 77.50% 的锰和 100% 的锌。此外，还绘制了 McCabe-Thiele 图，要达到最高的萃取效率，需要对锌进行单步萃取，对锰进行两步萃取。热力学参数 ΔH 经过计算后发现，锰的热力学参数为 18.39 kJ/mol，而锌的热力学参数为 - 245.50 kJ/mol，这表明锰的萃取过程是内热的，而锌的萃取过程是放热的。使用 6 M HCl 的汽提溶液可以从负载有机相中获得理想的锰和锌汽提效果。

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来源期刊

Journal of Sustainable Metallurgy Materials Science-Metals and Alloys

CiteScore

4.00

自引率

12.50%

发文量

151

期刊介绍： Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.