2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 2: Gudenau Intl. Symp. / Iron and Steel Making
| Editors: | Kongoli F, Kleinschmidt G, Pook H, Ohno K, Wu K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 340 pages |
| ISBN: | 978-1-987820-25-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Study of Chromium-Ore Elements Reducibility
Oleg Zayakin1; Vladimir Zhuchkov1;1INSTITUTE OF METALLURGY OF URAL DIVISION OF RAS, Ekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 136
Topic: 2
Abstract:
The degree estimation of chromium transfer into metal phase in the result of carbothermic reduction of components of poor ores of Saranovsk deposit (Russia) and rich ores of Kempirsaysk massif (Republic of Kazakhstan) is the goal of the present work.
Now, one of the most used and kindly deposit of chromium-ore raw in Russia is Saranovsk one. However, the production of ferrochrome with Cr content about 60-65 % is impossible due to low content of Cr2O3 (33-38 %) in the raw materials. Therefore, at the domestic ferroalloy plants a mixture of poor domestic ore and rich imported one are used, which will act to decrease the degree of chromium recovery into metal.
The relationship between the chromium reduction degree and the heating rates were determined experimentally by thermogravimetry technique at high-temperatures (900-1600°) with further identification of chemical composition of both oxide and metal phases.
The kinetic dependences of samples mixture mass change at ratio 50/50 of chromium raw from Saranovsk deposit and Kempirsaysk massif in the presence of carbon (small fraction coke) have been determined owing to proceeding of reduction processes. It was established that the increase of the heating rate of chromium-ore samples from 4 up to 11°/min will cause no change of chromium reduction degree. Testing experience revealed that the chromium reduction degree is over 95 % when the temperature reaches 1600°. The effect of further increase of the heating rate is to decrease the chromium reduction degree in progressive manner. For example, when the heating rate is 64°/min, the reduction degree of Cr is only 55%.
Keywords:
Ferrous; Metallurgy; Modeling; Process; Recovery; Temperature;References:
[1] http://www.rosnedra.gov.ru/article/7808.html[2] http://www.mineral.ru/Facts/russia/156/519/3_06_cr.pdf
[3] N.P. Lyakishev, M.I. Gasik. ELIZ, Metallurgiya chroma (Chromium Metallurgy), Moscow, 1999.