Selective leaching of a mixed nickel-cobalt hydroxide precipitate in sulphuric acid solution with potassium permanganate as oxidant


Hussaini S., Ichlas Z. T. , TOP S. , KURŞUNOĞLU S. , Kaya M.

Separation Science and Technology (Philadelphia), vol.56, pp.2475-2484, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 56
  • Publication Date: 2021
  • Doi Number: 10.1080/01496395.2020.1832523
  • Title of Journal : Separation Science and Technology (Philadelphia)
  • Page Numbers: pp.2475-2484
  • Keywords: Selective leaching, potassium permanganate, mixed nickel-cobalt hydroxide precipitate, solvent extraction, nickel

Abstract

© 2020 Taylor & Francis Group, LLC.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°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.