Direct synthesis of nickel powders from NiO slurry by hydrothermal hydrogen reduction process

Jong Gwan Ahn, Hoang Tri Hai, Dong Jin Kim, Je Shin Park, Sang Bae Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

High purity nickel powder (99.5% Ni) was prepared by direct hydrogen reduction of commercial NiO powder in an acidic slurry in an autoclave with a yield of approximately 100% at 250 °C, initial pH 5.4 and 300 psi partial hydrogen pressure. It was found that the initial pH of the solution and the addition of NiSO4 play critical roles in the NiO/Ni powder conversion process. They provide an adequate acidic media and a source of SO42- counter ions for dissolving NiO into Ni2+ ions, while the subsequent reduction of Ni2+ ions to metallic nickel proceeds.

Original languageEnglish
Pages (from-to)101-104
Number of pages4
JournalHydrometallurgy
Volume102
Issue number1-4
DOIs
Publication statusPublished - 2010 Apr 1

Keywords

  • Acidic solution
  • Hydrogen reduction
  • Nickel oxide slurry
  • Nickel powder
  • Nickel sulfate

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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