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

  • Victor de Alvarenga OliveiraEmail author
  • Cláudio Gouvêa dos Santos
  • Eduardo de Albuquerque Brocchi


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).



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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Victor de Alvarenga Oliveira
    • 1
    Email author
  • Cláudio Gouvêa dos Santos
    • 2
  • Eduardo de Albuquerque Brocchi
    • 3
  1. 1.Thermal Analysis Laboratory, Department of Metallurgical and Materials EngineeringUniversidade Federal de Ouro PretoOuro PretoBrazil
  2. 2.Polymer Analysis Laboratory, Department of ChemistryUniversidade Federal de Ouro PretoOuro PretoBrazil
  3. 3.Department of Chemical and Materials EngineeringPUC-RioRio de JaneiroBrazil

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