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

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 H 2 atmosphere in rotary kiln were performed in the presence of NaCl and the product of the reaction was leached...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2019-06, Vol.50 (3), p.1309-1321
Main Authors: de Alvarenga Oliveira, Victor, dos Santos, Cláudio Gouvêa, de Albuquerque Brocchi, Eduardo
Format: Article
Language:English
Subjects:
ALUMINIUM SILICATES
Aluminum silicates
ATMOSPHERES
Characterization and Evaluation of Materials
Chemistry and Materials Science
CHLORINATION
FURNACES
HYDROCHLORIC ACID
HYDROGEN
KILNS
LEACHING
MATERIALS SCIENCE
Metallic Materials
Nanotechnology
Nickel chloride
NICKEL CHLORIDES
NICKEL ORES
NICKEL OXIDES
PYROLYSIS
Reduction
SEGREGATION
Silicon dioxide
SILICON OXIDES
SODIUM CHLORIDES
Structural Materials
Surfaces and Interfaces
Thermal decomposition
THERMAL GRAVIMETRIC ANALYSIS
Thermogravimetric analysis
Thin Films
WATER
X-RAY DIFFRACTION
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Summary: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 H 2 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 H 2 promote the segregation of nickel according to the following steps: (1) Nickel oxide reduction by hydrogen: NiO + H 2(g)  → Ni + H 2 O (g) . (2) Formation of HCl: Al 2 SiO 5  + 2NaCl + SiO 2  + H 2 O → 2HCl(g) + 2NaAlSiO 4 . (3) Chlorination of metallic nickel by HCl: Ni + 2HCl (g)  → NiCl 2  + H 2(g) . (4) Reduction of nickel chloride by hydrogen: NiCl 2  + H 2(g)  → Ni + 2HCl (g) .
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-019-01552-w