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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Cascade sulfidation and separation of copper and arsenic from acidic wastewater via gas-liquid reaction
Liyuan Chai1; Guomin Jiang1; 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: 279
Topic: 7
Abstract:
Copper and arsenic in acidic wastewater were separated by cascade sulfidation followed by replacement of arsenic in the precipitates by copper in the solution which was realized by recycling precipitates obtained in the first stage into the initial solution. The effects of time, temperature and sulfide dosage on copper and arsenic removal efficiency as well as the effects of solid to liquid ratio, time and temperature on replacement of arsenic by copper were investigated. With 20 mmol/L H2S at 50¡æ within 0.5 min, more than 80% copper and nearly 20% arsenic were precipitated. The separation efficiency of copper and arsenic was higher than 99% by the replacement reaction between As2S3 and copper ions when solid to liquid ratio was more than 10% at 20¡æ within 10 min. CuS was the main phases in precipitate in which copper content was 63.38% by weight.