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| Study on Settlement and Separation of Products in Hot Molten Salt during Process of Lead Smelting in Low-temperature Molten Salt |
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Received:May 14, 2020
Revised:May 19, 2020
Accepted:May 20, 2020
Published Online:July 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.08.003 |
| KeyWord:pyrometallurgy of lead; gravity settlement; sodium carbonate; hot separation |
| Author | Institution |
| HU Yu-jie |
湖南工业大学 冶金与材料工程学院 |
| CHEN Yi-feng |
湖南工业大学 冶金与材料工程学院 |
| WANG Yu-fei |
湖南工业大学 冶金与材料工程学院 |
| ZHOU Zheng-hua |
株冶集团股份有限责任公司 |
| TANG Zhi-bo |
株冶集团股份有限责任公司 |
| XIA Zhong-wei |
株冶集团股份有限责任公司 |
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| Abstract: |
| Gravity settlement regularity of solid particles and liquid lead beads in hot molten salt was studied and settlement and separation conditions of solid and molten salt were optimized. The results show that sequence of settling velocity about such solid particles, i.e., ZnS, ZnO and liquid lead beads, is Pb>ZnS>ZnO, and settling velocity rises with increase of temperature. Settling temperature should not be higher than 900 ℃ because trend for reaction between ZnS and Na2CO3 to produce ZnO will rise which is bad for sulfur-fixation of ZnO. More than 80 percent of ZnS and ZnO particles settle to bottom of reactor to realize hot separation from molten salt under the conditions including salt solid ratio of 2.8, temperature of 900 ℃, and heat preservation time of 3 h. More than 92 percent of liquid lead can be settled to bottom of reactor within a short time and less than 2 percent of lead remains on surface of molten salt. |
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