2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 10: Battery, Recycling, Environmental, Mining
| Editors: | Kongoli F, Kumar V, Aifantis K, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 220 pages |
| ISBN: | 978-1-987820-54-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Recovery of zinc from high iron-bearing zinc calcines by alkaline leaching and precipitation process
Ning Peng1; Liyuan Chai1; Xiao-bo Min2; Hui Liu2;1CENTRAL SOUTH UNIVERSITY, Changsha, China; 2SCHOOL OF METALLURGY AND ENVIRONMENT, CENTRAL SOUTH UNIVERSITY, Changsha, China;
Type of Paper: Regular
Id Paper: 280
Topic: 7
Abstract:
A new method to recover zinc from high iron-bearing zinc calcines is developed. Zinc calcines was roasted to decompose zinc ferrite under the atmosphere of CO and CO2, then the roasted product was leached with alkaline solutions, in which zinc was selectively leached and iron was remained in leaching residues. Zinc extraction is as high as 98% after leaching in 5mol/L NaOH at 100oC for 60min. The leachate was purified using Na2S and Pb, Cu was removed as sulfide precipitates. The zinc was recovered from purified zinc pregnant solutions by pH adjustments using spent electrolyte as neutralizers. Nearly 99% of zinc were recovered as zinc hydroxide, and zinc oxide with high purity and good crystal structure was obtained from the zinc hydroxide after roasting at 250oC for 60min.