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Optimal Combination of Calcination and Reduction Conditions as well as Na2SO4 Additive for Carbothermic Reduction of Limonite Ore

Guan-Jhou Chen, Jia-Shyan Shiau

2016enlimonitecalcinationreductionadditivenickel

Abstract

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The optimal carbothermic reduction parameters of limonite ore and the influence of calcining temperature on these were investigated. In addition, the impact of the addition of Na2SO4 on limonite ore which had been calcined before reduction at optimal carbothermic conditions was also examined. Various analytical techniques including XRD analysis, BET-specific surface area analysis, bromine methyl alcohol solution analysis, and chemical compositional analysis were utilized to derive the associated parameters. The study found that the best nickel grade and recovery rate of the 673 K-calcined limonite ore can achieve greater than 30 mass% and 90.2 mass%, respectively, under a reduction temperature of 1373 K, with a reduction time of 30 minutes, and a carbon-oxygen ratio of 0.6. This optimal performance is attributed to the 673 K-calcined limonite ore exhibiting the highest specific surface area of 46.8 m²/g with pore sizes of 29.7 Å. Moreover, the addition of 5 mass% Na2SO4 further enhanced the nickel grade to over 30 mass% and improved the recovery rate to 93.8 mass% at the same reduction conditions.

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Cite This Work

@article{c3958d5f-d5a8-4257-a208-2ff704ecd8c6,
  title={Optimal Combination of Calcination and Reduction Conditions as well as Na2SO4 Additive for Carbothermic Reduction of Limonite Ore},
  author={Guan-Jhou Chen and Jia-Shyan Shiau},
  year={2016},
  language={en}
}
TY  - JOUR
TI  - Optimal Combination of Calcination and Reduction Conditions as well as Na2SO4 Additive for Carbothermic Reduction of Limonite Ore
AU  - Guan-Jhou Chen
AU  - Jia-Shyan Shiau
PY  - 2016
LA  - en
ER  -

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