Abstract
(NH4)2SO4 roasting followed by water leaching to process nickel- chromium mixed metal oxidized (MO) ore was investigated. The optimal operating parameters were obtained after determining the influences of the molar ratio of (NH4)2SO4 to mixed oxidized ore, roasting temperature and roasting time on metal extractions. The extraction efficiencies of Ni, Fe, Mg, Al and Cr reached 94.02%, 87.87%, 84.14%, 74.00% and 41.49%, respectively. The transformation of mineral phases during roasting were identified by XRD analysis combining with TG-DTA curves and phases transformation analysis of analytic reagents with (NH4)2SO4. The phase transition process in experimental temperature range can be summarized as: MO to (NH4)2M(SO4)2 to MSO4 and M2O3 to (NH4)3M(SO4)3 to NH4M(SO4)2 to M2(SO4)3 (M is divalent and trivalent metallic element). The work demonstrates an effective process to treat nickel-chromium mixed metal oxidized ores. The reaction mechanism of Fe meets the chemical reaction control mechanism, while the reaction mechanism of Ni, Mg and Al follows the mixed control mechanism of the chemical reaction and diffusion controls.
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