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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Hydrogen Peroxide Catalytic Reduction of Selenate by Sulfur Dioxide and Formation Mechanism Research of Selenium Elementary Substance
Runze Xu1;1CENTRAL SOUTH UNIVERSITY, Changsha, China;
Type of Paper: Regular
Id Paper: 259
Topic: 6
Abstract:
Hydrogen peroxide catalyze reduce selenic acid by sulfur dioxide was discovered in this paper. The experimental conditions such as reaction temperature and acidity of solution have less influence on the catalytic reduction, and the reduction rates of selenate are all above 99.8%. This new method offered a solution of recovering selenate. Further research revealed the formation mechanism of selenium elementary substance under different reaction temperature. The analyses of solution concentration and characterizations of solid particles indicated that, under 25 oC, selenic can be directly catalytic reduced into red selenium, while reaction temperature is above 60 oC, the trigonal crystal selenium was formed by reaction between Se2- and Se4+, where the Se2- was produced by further reduction of red selenium, not a simple crystal form transformation as a result of temperature change.