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| Mechanism of Oxalic Acid Induced Dissolution of Dashuigou Tellurium Deposit |
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Received:April 17, 2023
Revised:April 26, 2023
Accepted:April 28, 2023
Published Online:July 10, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.08.010 |
| KeyWord:Dashuigou tellurium deposit; oxalic acid; computational simulation; combination mode; electron transfer mechanism |
| Author | Institution |
| ZHANG Qin |
西南科技大学 材料与化学学院 |
| BIAN Liang |
西南科技大学 环境友好能源材料国家重点实验室 |
| SONG Mian-xin |
西南科技大学 材料与化学学院 |
| NIE Jia-nan |
西南科技大学 环境与资源学院 |
| ZHANG Jin-mei |
西南科技大学 环境与资源学院 |
| ZHANG Peng |
西南科技大学 材料与化学学院 |
| XIE Xin |
西南科技大学 环境与资源学院 |
| ZHANG Jiao |
西南科技大学 环境与资源学院 |
| YANG Min |
西南科技大学 环境与资源学院 |
| LUO Wei-hui |
西南科技大学 环境与资源学院 |
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| Abstract: |
| With the development of society, the demand for tellurium is increasing, and the exploitation and utilization of low-grade Dashuigou tellurite deposit has attracted more and more attention. Oxalic acid was used to dissolve Dashuigou tellurium deposit under atmospheric pressure. The results show that the dissolution amounts of Fe, Mg, Ca, Al and Si is 662, 187, 610, 686 and 64 mg/L, respectively under the conditions of oxalic acid concentration of 0.25 mol/L, liquid-solid ratio of 15︰1 and reaction time of 15 d. Te is enriched in filter slag. The sequence of dissolution of mineral phases is dolomite, pyrrhotite and tetradymite. The binding mode and electron transfer mechanism between oxalic acid and dolomite, pyrrhotite and tetradymite were calculated and simulated. The results show that oxalic acid is adsorbed on the surface of mineral through the acid hydrolysis of hydrogen atom and the complexation of oxygen atom, and the electron transfer from oxalic acid to the surface of dolomite, while the opposite is true for pyrrhotite and tetradymite. |
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