Separation of copper and indium from zinc hydrometallurgy solution
| Autor: | Cunxiong Li, Deng Zhigan, Li Xingbin, Gang Fan, Li Minting, Chang Wei, Yu Zheng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Gypsum
Hydrometallurgy Chemistry General Chemical Engineering Inorganic chemistry 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology Zinc engineering.material 021001 nanoscience & nanotechnology Copper engineering 0210 nano-technology Indium 021102 mining & metallurgy |
| Zdroj: | International Journal of Chemical Reactor Engineering. 18 |
| ISSN: | 1542-6580 2194-5748 |
| DOI: | 10.1515/ijcre-2020-0082 |
| Popis: | The separation and recovery of copper and indium from a solution arising from the reductive leaching of a zinc leaching residue was studied. Copper was enriched into a copper precipitate produced by iron powder precipitation; indium was hydrolyzed and enriched into a gypsum indium precipitate produced by limestone adjustment of pH. Separation and recovery of both copper and indium were achieved. The results showed that precipitation of copper(II) and arsenic(III) as Cu2O and Cu3As is thermodynamically feasible by adding iron powder to the reductive leach of a zinc leaching residue. Increasing the iron powder addition and reaction temperature promoted the formation of Cu2O and Cu3As. In the process of neutralizing and precipitating indium by adjusting the pH using limestone, indium was mainly concentrated in the precipitate by hydrolytic precipitation. The pH of the neutralization endpoint plays a decisive role in this hydrolytic enrichment. The extent of indium precipitation exceeded 98%, and the indium content of the precipitate reached 3.6 kg/t. Addition of limestone balances the acid across the entire production process. The main phase in the gypsum indium precipitate was CaSO4·2H2O, the stable properties of which create favorable conditions for the recovery of indium in subsequent steps. |
| Databáze: | OpenAIRE |
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