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| Thermodynamic Analysis and Application of Na2CO3-NaCl-C-PbSO4-CuO System |
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Received:July 18, 2016
Revised:July 25, 2016
Accepted:July 26, 2016
Published Online:November 17, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.12.001 |
| KeyWord:metallurgy at low temperature; secondary lead; thermodynamic analysis |
| Author | Institution |
| Ping ZENG |
中南大学 冶金与环境学院 |
| Chao-bo TANG |
中南大学 冶金与环境学院 |
| Lei TANG |
中南大学 冶金与环境学院 |
| Yun LI |
中南大学 冶金与环境学院 |
| Yong LIU |
中南大学 冶金与环境学院 |
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| Abstract: |
| Thermodynamic analysis of Na2CO3-NaCl-C-PbSO4-CuO low temperature alkaline system for lead smelting was carried out. Curves between △GθT and reaction temperature (T) of different reactions at 600~1 200 K were obtained based on calculation. The results show that PbSO4 can be reduced to metal lead, sulfur can be fixed in CuS, and sodium salt can be converted into Na2CO3 at 600~1 200 K. The stable phases of the system are mainly composed of metal lead, CuS and Na2CO3 at 1 123 K. New process to smelt lead in Na2CO3-NaCl-C-PbSO4-CuO low temperature molten salt was proposed. Verification test was carried out at 1 123 K applying spent lead-acid battery colloid sludge as material, Na2CO3-NaCl as flux, CuO as sulfur additives, and coke powder as reducing agent. Grade of crude lead is 98.10% with lead direct yield of 93.27% and lead total yield of 99.25%. 93.81% of sulfur embraced in raw materials can be fixed as CuS without SO2 emission through whole process. The verification test results are in accordance with thermodynamic analysis results. |
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