Selective leaching of a mixed nickel-cobalt hydroxide precipitate in sulphuric acid solution with potassium permanganate as oxidant
SEPARATION SCIENCE AND TECHNOLOGY, vol.56, no.14, pp.2475-2484, 2021 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 56 Issue: 14
- Publication Date: 2021
- Doi Number: 10.1080/01496395.2020.1832523
- Journal Name: SEPARATION SCIENCE AND TECHNOLOGY
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Agricultural & Environmental Science Database, Analytical Abstracts, Applied Science & Technology Source, Biotechnology Research Abstracts, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Pollution Abstracts, DIALNET, Civil Engineering Abstracts
- Page Numbers: pp.2475-2484
- Keywords: mixed nickel-cobalt hydroxide precipitate, nickel, potassium permanganate, Selective leaching, solvent extraction
- Eskisehir Osmangazi University Affiliated: Yes
Abstract
Selective leaching of a mixed nickel-cobalt hydroxide precipitate was investigated using potassium permanganate as oxidant in sulfuric acid solution. 94.9% Ni, 50% Co and 0.6% Mn were dissolved under the following conditions: sulfuric acid concentration of 0.75 M, potassium permanganate of 5 g/L, temperature of 30 degrees C, leaching duration of 60 min, solid-to-liquid ratio of 1/10, and stirring speed of 400rpm. The pregnant leach solution was subjected to a solvent extraction process. 98% Co and 99% Mn were extracted at pH 4.84 with 30% (v/v) Cyanex 272, leaving essentially all nickel in the raffinate. Based on the experimental results, a flowsheet is proposed.