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

doi:10.1016/j.hydromet.2010.02.005

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

^*Corresponding author for this work

Metallurgical System Engineering

Korea Institute of Geoscience and Mineral Resources
Tohoku University

Research output: Contribution to journal › Journal article › peer-review

13 Scopus citations

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 SO₄^2- counter ions for dissolving NiO into Ni²⁺ ions, while the subsequent reduction of Ni²⁺ ions to metallic nickel proceeds.

Original language	English
Pages (from-to)	101-104
Number of pages	4
Journal	Hydrometallurgy
Volume	102
Issue number	1-4
DOIs	https://doi.org/10.1016/j.hydromet.2010.02.005
State	Published - 2010.04

Keywords

Acidic solution
Hydrogen reduction
Nickel oxide slurry
Nickel powder
Nickel sulfate

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10.1016/j.hydromet.2010.02.005

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@article{3894701409754661971a749b9e5e91fd,

title = "Direct synthesis of nickel powders from NiO slurry by hydrothermal hydrogen reduction process",

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.",

keywords = "Acidic solution, Hydrogen reduction, Nickel oxide slurry, Nickel powder, Nickel sulfate",

author = "Ahn, \{Jong Gwan\} and Hai, \{Hoang Tri\} and Kim, \{Dong Jin\} and Park, \{Je Shin\} and Kim, \{Sang Bae\}",

year = "2010",

month = apr,

doi = "10.1016/j.hydromet.2010.02.005",

language = "English",

volume = "102",

pages = "101--104",

journal = "Hydrometallurgy",

issn = "0304-386X",

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TY - JOUR

T1 - Direct synthesis of nickel powders from NiO slurry by hydrothermal hydrogen reduction process

AU - Ahn, Jong Gwan

AU - Hai, Hoang Tri

AU - Kim, Dong Jin

AU - Park, Je Shin

AU - Kim, Sang Bae

PY - 2010/4

Y1 - 2010/4

N2 - 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.

AB - 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.

KW - Acidic solution

KW - Hydrogen reduction

KW - Nickel oxide slurry

KW - Nickel powder

KW - Nickel sulfate

UR - https://www.scopus.com/pages/publications/77949485816

U2 - 10.1016/j.hydromet.2010.02.005

DO - 10.1016/j.hydromet.2010.02.005

M3 - Journal article

AN - SCOPUS:77949485816

SN - 0304-386X

VL - 102

SP - 101

EP - 104

JO - Hydrometallurgy

JF - Hydrometallurgy

IS - 1-4

ER -

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

Abstract

Keywords

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