Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH
| Autor: | Biao Wu, Jiankang Wen, Sun Jianzhi, Bo-wei Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
Nickel sulfide Olivine Chemistry Magnesium Mechanical Engineering Metallurgy 0211 other engineering and technologies Metals and Alloys chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology chemistry.chemical_compound Nickel Geochemistry and Petrology Mechanics of Materials Bioleaching Materials Chemistry engineering Leaching (metallurgy) 0210 nano-technology Dissolution Cobalt 021102 mining & metallurgy |
| Zdroj: | International Journal of Minerals, Metallurgy, and Materials. 26:1069-1079 |
| ISSN: | 1869-103X 1674-4799 |
| DOI: | 10.1007/s12613-019-1823-8 |
| Popis: | To inhibit the dissolution of Mg2+ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bi-oleaching 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 bi-oleaching 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. |
| Databáze: | OpenAIRE |
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