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| Study on Reduction Reaction of Tellurium in Pt/Pd-Replaced Solution |
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Received:April 09, 2016
Revised:April 12, 2016
Accepted:April 13, 2016
Published Online:August 19, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.09.010 |
| KeyWord:Pt/Pd-replaced solution; tellurium; sulfur dioxide; reduction; catalysis; mechanism |
| Author | Institution |
| Hu Yiwen |
江西铜业集团公司 江西铜业技术研究院有限公司 |
| He Qiang |
江西铜业集团公司 江西铜业技术研究院有限公司 |
| Wang Ri |
江西铜业集团公司 江西铜业技术研究院有限公司 |
| Wang Qiu-yu |
江西铜业集团公司 江西铜业技术研究院有限公司 |
| Huang Shao-yong |
江西铜业集团公司 贵溪冶炼厂 |
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| Abstract: |
| Reduction reaction of tellurium in Pt/Pd-replaced solution was investigated with sulfur dioxide as reductant. The results show that tellurium reduction rate is 99% above with Te content in raw-tellurium powder of 90% above under the conditions including Cl- concentration of 1.0 mol/L by adding hydrochloric acid, reaction temperature of 75 ℃, and aeration of SO2 gas of 2 h. Reduction of Te rises with increase of reaction duration, temperature, and acidity of solution. Reduction reaction of Te is in accordance with pseudo-first-order reaction controlled by kinetics. Mechanism model for reduction reaction between SO2 and Te is proposed, in which Cl- and H are both regarded as catalytic species during transformation from tellurous acid to tellurium tetrachloride. |
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