Dechromization Kinetics of Limonitic Laterite Ores by Alkali-Roasting Method Using Sodium Hydroxide

Abstract:

A novel process was proposed for the activation pretreatment of Cr-containing limonitic laterite ores by NaOH roasting. The dechromization kinetics of the laterite ores and the effect of particle size, NaOH-ore ratio, and roasting temperature on Cr extraction were studied in detail. Experimental results indicate that decreasing the particle size and increasing the NaOH-ore ratio and roasting temperature increase the Cr extraction rate. Approximately 96% Cr in the laterite ores could be extracted under the optimal alkali-roasting conditions. The results also indicate that the Avrami model is suitable for the dechromization process and that the apparent activation energy is calculated 11.12 kJ·mol^-1. The 99.5% Cr₂O₃ was obtained from Na₂CrO₄ leached in the alkali solution by liquid-phase reduction and then calcining at high temperature.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 798-804
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.798
• Online since: May 2011
• Authors: Qiang Guo, Jing Kui Qu, Bing Bing Han, Guang Ye Wei, Tao Qi
• Keywords: Activation Pretreatment, Alkali-Roasting, Cr-Containing Limonitic Laterite Ores, Dechromization Kinetics, Pressure Acid Leaching, Sodium Hydroxide (NaOH)

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