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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Physicochemical characteristics of oxide and metal systems formed in the result of production of chromium-containing alloys made of high-aluminous chromium ores
Oleg Zayakin1; Vladimir Zhuchkov1;1INSTITUTE OF METALLURGY OF URAL DIVISION OF RAS, Ekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 255
Topic: 12
Abstract:
The high-aluminous chromium ores containing about 15-18% of Al2O3 are widespread at Russian deposits, but their physicochemical and metallurgical characteristics are scantily known.
We have investigated the effect of initial raw material form on viscosity and crystallization temperature of oxide melts. Besides crystallization temperatures and density of produced metal alloys were studied. It was established that in the result of Russian high-aluminous ores the slags having reduced crystallization temperature are obtained. The crystallization temperature of traditional slags formed at high-carbon ferrochrome smelting is higher by ~95°C. The produced ferroalloy with reduced chromium content (55-57%) and increased silicon content (3-5%) have reduced temperature of solidification onset (~1560 instead of 1620 iÑ), density (7290 instead of 7790 kg*m-3), the alloys are qualified by more favourable functional characteristics of steel treatment in comparison with widespread ferrochromium grade (with 62-65 % of Cr).
Distinctive features of smelting technology of high-carbon ferrochrome made of poor high-aluminous raw materials were studied. It was discovered that in the result of high-aluminous ores application the residual content of total chromium content in the slag is increased up to ~7%. It was demonstrated the possibility of high-carbon ferrochrome grades production with the utilization of domestic high-aluminous chromium-ore raw materials. The finished alloy is suited to the requirements of FeCr60C70Si4LS grade of international standard ISO 5448-91.
Keywords:
Chrome; Ferro-Alloys; Metallurgy; Metals; Production; Slag;References:
[1] http://www.mineral.ru/Facts/russia/156/519/3_06_cr.pdf[2] I.J. Geldenhuys, Proceedings of the Efficient Technologies in ferroalloy industry: INFACON ХIII. Vоlume I. Karaganda, 2013. P.Dipner, CD-ROM, 31-47.
[3] E. Ringdalen, M. Rocha, J. Ramos, T. Malvik Proceedings of the Efficient Technologies in ferroalloy industry: INFACON ХIII. Vоlume I. Karaganda, 2013. P.Dipner, CD-ROM, 115-125.
[4] V.P. Chernobrovin, A.I. Pashkeev, G.G. Mikhailov, I.Yu. Pashkeev Study of viscosity and crystallization temperature of high-magnesia melts of MgO-Al2O3-SiO2 system with sodium and calcium oxides additives, Vestnik YuUrGU Series Metallurgy, 5 3 (2005), 36-41
[5] M. Somerville, S. Wright, S. Sun, S. Jahanshahi, Proceedings of VII International Conference on Molten Slags, Fluxes and Salts, The South African Institute of Mining and Metallurgy, 2004. 219-224.
[6] O.V.Zayakin, A.A. Akberdin, A.S. Kim, V.I. Zhuchkov, Proceedings of XIV Russian conference on Structure and properties of metal and slag melts. Ekaterinburg UrB RAS, 2015. 214-215