2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 10: Mineral & Secondary Battery
| Editors: | Kongoli F, Silva AC, Arol AI, Kumar V, Aifantis K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 340 pages |
| ISBN: | 978-1-987820-33-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The Receiving of Scandium Rough Concentrate during the Processing of Red Mud in Alumina Production
Sergei Semenov1; Yulia Sokolova2; Elena Bogatyreva2;1LOMONOSOV MOSCOW STATE UNIVERSITY OF FINE CHEMICAL TECHNOLOGIES, Moscow, Russian Federation; 2NATIONAL UNIVERSITY OF SCIENCE AND TECHNOLOGY - MISIS, Moscow, Russian Federation;
Type of Paper: Regular
Id Paper: 138
Topic: 5
Abstract:
Red mud (RM) is a large-capacity waste of alumina production in the processing of bauxite by the Bayer process. Its productivity is 1.5 - 1.7 tons per 1 ton of alumina. Russia has accumulated hundreds of millions of tons of this waste.
This kind of waste, depending on raw materials and processing method, contains percentages: 17-46 Fe2O3, 8-24 Al2O3, 1,4-14 Na2O, 3-5 TiO2, 8-11 SiO2, and about 150 g/ton Sc2O3 and noticeable amounts of oxides of rare earth elements, but is currently being used in small quantities in the production of building materials (cement, ceramics). There are numerous developments in RM processing to obtain coagulants, additives for the ferrous metallurgy. In this case, RM is one of the most perspective raw sources of scandium.
We have developed a method of leaching of scandium from RM by sulfuric acid solution at 80A°C, and the optimal conditions under which the degree of leaching of the scandium is 92-96%. From the resulting solution with the composition, mg/l: Sc 10-13, Y 4-10, Al 7500 - 10000, Fe 29000 - 33000, Ti 2900-3300, Zr 100 - 120, Mg 500-700, V 48-65, Mn 310-430 we carried out extraction of scandium by kerosene solution of a mixture of TBP and DEHPA. The saturation of extractant by scandium is 450-850 mg/l. Reextraction was carried out with a solution of caustic soda and soda. As a result, we have obtained samples of concentrate containing 2.2 - 3.4% of scandium.