| Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH |
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| 作者姓名： | Jian-zhi Sun Jian-kang Wen Bo-wei Chen Biao Wu |
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| 作者单位： | National Engineering Laboratory of Biohydrometallurgy, GRINM Group Corporation Limited, Beijing 100088, China |
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| 摘 要： | To inhibit the dissolution of Mg2+ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bioleaching factors on the dissolution of Mg2+ from olivine and serpentine was investigated and kinetics studies were carried out. The results indicated that the dissolution rate-controlling steps are chemical reaction for olivine and internal diffusion for serpentine. The most influential factor on the dissolution of Mg2+ from olivine and serpentine was temperature, followed by pH and particle size. A novel method of bioleaching at elevated pH was used in the bioleaching of Jinchuan ore. The results showed that elevated pH could significantly reduce the dissolution of Mg2+ and acid consumption along with slightly influencing the leaching efficiencies of nickel and cobalt. A model was used to explain the leaching behaviors of high-magnesium nickel sulfide ore in different bioleaching systems. The model suggested that olivine will be depleted eventually, whereas serpentine will remain because of the difference in the rate-controlling steps. Bioleaching at elevated pH is a suitable method for treating high-magnesium nickel sulfide ores.
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| 关 键 词： | olivine serpentine high-magnesium nickel sulfide ore bioleaching shrinking core model elevated pH |
Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH |
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| Jian-zhi Sun,Jian-kang Wen,Bo-wei Chen,Biao Wu.Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH[J].International Journal of Minerals,Metallurgy and Materials,2019,26(9):1069-1079. |
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