2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 8: Non-ferrous, Rotary Kiln, Ferro-alloys, Rare Earth, Coal
| Editors: | Kongoli F, Xueyi G, Shumskiy V, Kozlov P, Capiglia C, Silva AC, Turna T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 350 pages |
| ISBN: | 978-1-987820-50-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Reductive alkali-fusion of silver separated residue derived from copper anode slime
Dong Li1; Xueyi Guo1; Qinghua Tian1; Jing Zhang1; Zhipeng Xu1; Runze Xu1;1CENTRAL SOUTH UNIVERSITY, Changsha, China;
Type of Paper: Regular
Id Paper: 170
Topic: 6
Abstract:
Silver separated residue (SSR), a hydrometallurgical product derived from copper anode slime, which is abundant in valuable metals like Pb, Bi, Sb, Sn, Au, Ag and PGMs. In this paper, a novel method namely reductive alkali-fusion was employed to treat the SSR for the effective separation and enrichment of valuable metals. In the fused system of NaOH and Na2S, Pb and Bi sulfates were reduced to noble lead which also contains Au, Ag and PGMs, while the Sb and Sn were transformed into sodium oxysalts dissolved in fused salt. The results show that in the semi-industrialized experiment, the direct recovery of Pb reaches 87% and almost all Bi, Au, Ag and PGMs are enriched in noble lead under the suitable conditions as follows: 1:0.6:0.3 of SSR-NaOH-Na2S mass ratio, 700 oC of fusion temperature and 4 h of fusion time. For downstream treatments, the noble lead is favorable for vacuum distillation to separate valuable metals, and the molten salt can be treated by water leaching followed by H2O2 oxidation and Ca(OH)2 precipitation to recover Sb and Sn respectively.