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Assessing the Influence of NaCl on the Reduction of a Siliceous Laterite Nickel Ore Under Caron Process Conditions

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Abstract

The reduction by hydrogen and the thermal decomposition of a siliceous nickel laterite ore in the presence of NaCl were studied using thermogravimetric analysis (TGA). Reduction tests on H2 atmosphere in rotary kiln were performed in the presence of NaCl and the product of the reaction was leached in ammoniacal solution. The presence of only 1 pct of NaCl in the furnace increased the nickel extraction values from ≈ 3 to ≈ 90 pct when the experiment was carried out at 850 °C. According to the results of X-ray diffractometry and TGA, the presence of NaCl in the system and the reducing atmosphere of H2 promote the segregation of nickel according to the following steps: (1) Nickel oxide reduction by hydrogen: NiO + H2(g) → Ni + H2O(g). (2) Formation of HCl: Al2SiO5 + 2NaCl + SiO2 + H2O → 2HCl(g) + 2NaAlSiO4. (3) Chlorination of metallic nickel by HCl: Ni + 2HCl(g) → NiCl2 + H2(g). (4) Reduction of nickel chloride by hydrogen: NiCl2 + H2(g) → Ni + 2HCl(g).

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Acknowledgments

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES)—Finance Code 001. Financial support from the brazilian agencies CNPq and FAPEMIG is also greatly appreciated.

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Authors and Affiliations

  1. Thermal Analysis Laboratory, Department of Metallurgical and Materials Engineering, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, CEP 35400-000, Brazil

    Victor de Alvarenga Oliveira

  2. Polymer Analysis Laboratory, Department of Chemistry, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, CEP 35400-000, Brazil

    Cláudio Gouvêa dos Santos

  3. Department of Chemical and Materials Engineering, PUC-Rio, Rio de Janeiro, CEP 22454900, Brazil

    Eduardo de Albuquerque Brocchi

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  1. Victor de Alvarenga Oliveira
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  2. Cláudio Gouvêa dos Santos
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Correspondence to Victor de Alvarenga Oliveira.

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Manuscript submitted September 6, 2018.

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de Alvarenga Oliveira, V., dos Santos, C.G. & de Albuquerque Brocchi, E. Assessing the Influence of NaCl on the Reduction of a Siliceous Laterite Nickel Ore Under Caron Process Conditions. Metall Mater Trans B 50, 1309–1321 (2019). https://doi.org/10.1007/s11663-019-01552-w

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  • DOI: https://doi.org/10.1007/s11663-019-01552-w

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