Purification of Mn-Electrolyte Solution from Leaching of Zn-MnO2 Spent Batteries Using Cementation Technique

mohamed said, enas atef; Abdel-Ghafar, hamdy maamoun; Elsoeudy, Ramadan Ibrahim; mansour ali, sherine araby; ahmed, essam; owais, ashour

doi:10.21608/sceee.2024.284870.1022

	Purification of Mn-Electrolyte Solution from Leaching of Zn-MnO2 Spent Batteries Using Cementation Technique
Suez Canal Engineering, Energy and Environmental Science
Volume 2, Issue 1, July 2024, Page 51-62 PDF (1009.12 K)
Document Type: Original Article
DOI: 10.21608/sceee.2024.284870.1022
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Authors
enas atef mohamed said ¹; hamdy maamoun Abdel-Ghafar²; Ramadan Ibrahim Elsoeudy³; sherine araby mansour ali⁴; essam ahmed⁵; ashour owais⁵
¹mechanical engineering department, faculty of engineering ,Suez Canal university
²Central Metallurgical Research and Development Institute (CMRDI), PO Box 87 Helwan
³Mechanical Engineering Department, Faculty of Engineering, Suez Canal University
⁴Mechanical Engineering Department, Faculty of Engineering, Suez Canal University,
⁵Department of Metallurgical and Materials Engineering, Faculty of Petroleum and Mining Engineering, Suez University
Abstract
This paper investigates the purification of a manganese electrolyte solution, produced by leaching spent Zn-MnO2 primary batteries, using cementation with metallic manganese powder. The battery paste, composed mainly of 59.98% Mn and 37.23% Zn, was roasted at 900 °C for 30 minutes to remove carbon and convert MnO2 to Mn3O4. After roasting, the composition changed to 63.65% Mn and 31.73% Zn. Ascorbic acid and sulfuric acid were used as reducing and leaching agents, respectively, at 70°C for 3 hours with a solid-to-liquid ratio of 1/20 g/mL and a stirring rate of 200 rpm. The resulting leachate solution contained Mn and Zn at concentrations of 16.5 and 9.2 g/L, respectively. Cementation with manganese powder was then used to remove zinc from the leachate solution. The effects of reaction temperature, time, stirring rate, and amount of manganese powder on zinc removal were investigated. The optimal conditions for zinc removal (98.4%) were found to be 60 °C, 600 rpm, and 20 minutes. Analysis of the cemented powder revealed a composition of 82% Zn and 17% Mn. Further investigation determined that using the ideal amount of manganese powder achieved a purification efficiency of 99.67%, reducing the zinc concentration in solution to 0.03 g/L.
Keywords
Spent Zn-MnO2 battery; Cementation; Manganese; Zinc


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