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| Comprehensive Recovery of Valuable Metals from Waste Printed Circuit Boards by Low-temperature Alkaline Smelting in Na2CO3-NaOH-NaNO3 System |
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Received:March 06, 2014
Revised:March 10, 2014
Accepted:March 11, 2014
Published Online:August 21, 2014
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| DOI：10.3969/j.issn.1007-7545.2014.09.001 |
| KeyWord:Na2CO3-NaOH-NaNO3 molten salt system; alkaline smelting; waste printed circuit board; valuable metal |
| Author | Institution |
| Liu yang |
中南大学冶金与环境学院 |
| Liu Jing-xin |
中南大学冶金与环境学院 |
| Qin hong |
中南大学冶金与环境学院 |
| Guo Xue-yi |
中南大学冶金与环境学院 |
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| Abstract: |
| Valuable metals were recovered from multi-component metal powder (MMP) of waste printed circuit boards in alkaline oxide melt system of Na2CO3-NaOH-NaNO3. The effects of mass ratio of Na2CO3-NaOH, smelting temperature and time, mass ratio of alkaline medium-MMP on valuable metal extraction were investigated. The results show that composition of molten salt and optimum conditions include mass ratio of Na2CO3-NaOH of 5.3∶16, smelting temperature of 700 ℃, smelting time of 40 min, and mass ratio of alkaline medium-MMP of 5∶1. The transforming rate of tin, zinc, aluminum, and lead are 84.55%, 100%, 93.71%, and 73.72%, respectively. Copper is enriched in slag in form of CuO. |
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