2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 4: Recycling & Secondary Battery
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 498 pages |
| ISBN: | 978-1-987820-06-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Study of molten salts system in the treatment of waste printed circuit boards by low-temperature alkaline smelting
Jingxin Liu1; Xueyi Guo1; Dong Li1; Qinghua Tian1;1CENTRAL SOUTH UNIVERSITY, Changsha, China;
Type of Paper: Regular
Id Paper: 111
Topic: 5
Abstract:
In a special alkaline oxidizing smelting system, amphoteric metals Sn, Pb, Zn and Al in crushed metal enrichment (CME), originated from waste printed circuit boards (WPCB), were converted into soluble sodium salts that can be separated from other metals in a water leaching process efficiently. In this study, the effects of molten salt composition on the smelting conditions and valuable metal conversions were investigated in details to obtain the optimum system with high conversion efficiency but low energy consumption and material cost. The optimum composition of molten salts and smelting conditions were obtained as that mass ratio of CME-NaNO3-NaOH of 1:3.0:3.6, smelting temperature of 773K (500°C) and smelting time of 90min. The conversion percentages of amphoteric metals were as Sn 95.93%, Zn 96.63%, Pb 91.21%, while over 99.84% of Cu and all the precious metals in the CME were enriched in the water leaching residue and could be recovered by traditional metallurgical processes.