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| Clean Metallurgy for Lead Extraction from Lead-zinc Mixed Concentrate with Low-temperature Alkaline Smelting Process |
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Received:October 31, 2015
Revised:November 06, 2015
Accepted:November 09, 2015
Published Online:March 21, 2016
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| DOI：10.3969/j.issn.1007-7545.2016.04.006 |
| KeyWord:lead-zinc mixed concentrate; cleaning metallurgy; alkaline smelting at low temperature; thermodynamic; lead |
| Author | Institution |
| LIU Yong |
中南大学 冶金与环境学院 |
| TANG Chao-bo |
中南大学 冶金与环境学院 |
| TANG Mo-tang |
中南大学 冶金与环境学院 |
| CHEN Yong-ming |
中南大学 冶金与环境学院 |
| YANG Sheng-hai |
中南大学 冶金与环境学院 |
| YANG Jian-guang |
中南大学 冶金与环境学院 |
| and HE Jing |
中南大学 冶金与环境学院 |
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| Abstract: |
| A new technology of low-temperature alkaline cleaning smelting process was proposed. Thermodynamic analysis of low temperature alkaline system NaOH-C-PbS-ZnO for lead smelting was carried out. ΔGθ-T curves of this system were calculated and drown at 700~l 300 K. The results show that PbS is reduced to metal lead, sulfur is fixed in ZnS, and sodium salt is converted into Na2CO3 at 7 00~l 300 K. Stable phases of system are mainly composed of metal lead, ZnS and Na2CO3 at 1 133 K. With lead-zinc mixed concentrate as test material, NaOH as flux, secondary zinc oxide dusts as sulfur additives, and coke powder as reducing agent, the experiment results at 1 153 K show that grade of crude lead produced is 98.31 %, lead direct yield is 96.38 %, 97.65 % of sulfur embraced in raw materials can be fixed as ZnS with no emission of SO2 in the whole process, and most of NaOH turned into Na2CO3. Verification test results are in accordance with thermodynamic analysis results. |
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