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| Study on the reverse flotation separation behavior and mechanism of smithsonite and calcite using sodium isooctadecanoate as a collector |
| Received:July 11, 2024 Revised:July 16, 2024 |
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| DOI：doi：10.3969/j.issn.1671-9492.2024.08.017 |
| KeyWord:Smithsonite; calcite; reverse flotation; sodium isooctadecanoate; competitive adsorption |
| Author | Institution |
| Zhang Xiaoliang |
BGRIMM Technology Group; State Key Laboratory of Mineral Processing |
| Zhu Yangge |
BGRIMM Technology Group; State Key Laboratory of Mineral Processing |
| Zhao Zhiqiang |
BGRIMM Technology Group; State Key Laboratory of Mineral Processing |
| Zhao Jie |
BGRIMM Technology Group; State Key Laboratory of Mineral Processing |
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| Abstract: |
| Aimed at the issues of difficult flotation separation and high acid consumption during leaching caused by the high content of calcium and magnesium gangue minerals in zinc oxide ore, sodium isooctadecanoate with isomeric carbon chains was selected as flotation collector in this study. The reverse flotation separation behavior of smithsonite and calcite and the adsorption mechanism of collectors on the mineral surface were studied through micro-flotation tests, Zeta potential measurements, XPS analysis, and density functional theory calculation. The results indicated that increasing the pH value could effectively inhibit the flotation of smithsonite. Under strongly alkaline conditions, smithsonite and calcite showed a good tendency for reverse flotation separation. When the pH fixed was 11.5 and collector dosage was 1.25×10?3 mol.L?1, 62.1% of Ca in the artificial mixed ore was removed with a Zn loss rate of 11.9%. Smithsonite has significantly a stronger adsorption capacity for water molecules and OH? ions. There is a noticeable electron transfer between the calcite surface and the collector, with the mineral surface losing electrons and the electron density around the O atoms in the carboxyl group increasing. The amount of charge transfer between the smithsonite surface and the collector molecules is relatively small. |
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