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LIGHT METALS, CARBON MATERIALS
ArticleName An investigation of a single-stage red mud reducing roasting process with the cast iron and aluminate slag production
DOI 10.17580/nfm.2018.01.04
ArticleAuthor Anisonyan K. G., Kopyev D. Yu., Goncharov K. V., Sadykhov G. B.
ArticleAuthorData

A. A. Baikov Institute of Metallurgy and Material Science of the Russian Academy of Sciences, Federal State Budgetary Science Institution:

K. G. Anisonyan, Senior Researcher, e-mail: grikar84@mail.ru
D. Yu. Kopyev, Researcher
K. V. Goncharov, Researcher
G. B. Sadykhov, Chief Researcher

Abstract

Red mud is a technogenic waste product, a result of alumina production. It is a fine-dispersed material containing up to 60% Fe2O3 and up to 20% Al2O3. For each ton of alumina produced of bauxites there is more than 1 ton of red mud. In the absence of effective recycling technologies, red mud is practically not used and is almost completely stored in special sludge deposits, which negatively affects the environment. Tens of millions of tons of red mud are sent to the dumps every year in the world. More than 100 million tons of red mud has been piled up in Russia. High content of iron and aluminium in red mud requires a processing which provides an effective separation of these components and obtaining original iron- and aluminium-bearing products. In this connection, the present paper is focused on developing a single-stage reducing roasting process with simultaneous generation of cast iron, a product for steel industry, and the aluminate slag suitable for alumina production. The main stage of the red mud complex processing technology under development is a single-stage reducing roasting process which results in the cast iron and aluminate slag obtaining; the latter is further treated by water leaching for aluminium precipitation from solution. The roast is carried out for the ferric oxides reduction to metal and simultaneous aluminium transfer to water-insoluble sodium aluminate, which is provided by adding Na2CO3 and CaCO3 to a furnace charge in definite proportions. This article considers the manner in which the reducing roasting conditions (temperature, consumption of a reducing agent, composition of the furnace charge) influence over the ferric oxides reduction to metal and obtaining of the aluminate slag with a definite phase composition. As a result, the optimal conditions of the slag and cast iron formation are determined.

The study was performed by a grant of the Russian Science Foundation (project No. 17-73-10414).

keywords Red mud, alumina production, pyrometallurgical processing, reducing roasting, pig iron, aluminate slag, recycling of wastes
References

1. Layner A. I., Eremin N. I., Layner Yu. A., Pevzner I. Z. Alumina production. Moscow : Metallurgiya, 1978. 344 p.
2. Trushko V. L., Utkov V. A., Bazhin V. Yu. Topicality and possibilities for complete processing of red mud of aluminous production. Journal of Mining Institute. 2017. Vol. 227. pp. 547–553.
3. Ogorodnikova E. N., Nikolaeva S. K. Red mud, issues of storage and usage. Engineering-geological problems of the present time, and methods of their solution: collection of proceedings of research and practice conference. Moscow, 2017. pp. 284–288.
4. Pepper R. A., Couperthwaite S. J., Millar G. J. Comprehensive examination of acid leaching behaviour of mineral phases from red mud: recovery of Fe, Al, Ti, and Si. Minerals Engineering. 2016. Vol. 99. pp. 8–18.
5. Davris P., Balomenos E., Panias D., Paspaliaris I. Selective leaching of rare earth elements from bauxite residue (red mud), using a functionalized hydrophobic ionic liquid. Hydrometallurgy. 2016. Vol. 164. pp. 125–135.
6. Pyagay I. N., Kozhevnikov V. L., Pasechnik L. A., Skachkov V. M. Processing of alumina production red mud with recovery of scandium concentrate. Journal of Mining Institute. 2016. Vol. 218. pp. 225–232.
7. Medvedev A. S., Khayrullina R. T., Kirov S. S., Suss A. G. Technical scandium oxide obtaining from red mud of Urals Aluminium Smelter. Tsvetnye metally. 2015. No. 12. pp. 47–52.
8. Liu Z., Zong Y., Li H., Jia D., Zhao Z. Selectively recovering scandium from high alkali bayer red mud without impurities of iron, titanium and gallium. Journal of rare earths. 2017. Vol. 35. No. 9. p. 896.
9. Zhu X., Li W., Tang S., Zeng M., Bai P., Chen L. Selective recovery of vanadium and scandium by ion exchange with D201 and solvent extraction using P507 from hydrochloric acid leaching solution of red mud. Chemosphere. 2017. Vol. 175. pp. 365–372.
10. Loginova I. V., Shoppert A. A., Kyrchikov A. V., Ordon S. F., Medyankina I. S. Red muds of alumina production as high-ferriferous raw material for ferrous metallurgy. Stal. 2016. No. 1. pp. 67–70.
11. Sheshukov O. Yu., Mikheenkov M. A., Lobanov D. A., Ovchinnikova L. A., Vyaznikova E. A. Working through a technology of ferric oxide in red mud pyrometallurgical reduction. Actual problems of modern science, engineering and education. 2016. Vol. 1. No. 1 pp. 99–102.
12. Zinoveev D. V., Grudinskiy P. I., Dyubanov V. G. Alumina production waste products usage for obtaining pig iron and alumina cement. Modern problems of mining and metallurgical complex. Science and production: collection of proceedings of research and practice conference. Staryy Oskol. 2016. pp. 76–79.
13. Samouhos M., Taxiarchou M., Pilatos G., Tsakiridis P. E., Devlin E., Pissas M. Controlled reduction of red mud by H2 followed by magnetic separation. Minerals Engineering. 2017. Vol. 105. pp. 36–43.
14. Fujii A. L., dos Reis Torres D., de Oliveira Romano R. C., Cincotto M. A., Pileggi R. G. Impact of superplasticizer on the hardening of slag Portland cement blended with red mud. Construction and Building Materials. 2015. Vol. 101, Part 1. pp. 432–439.
15. Glinskaya I. V., Podgorodetskiy G. S., Teselkina A. E., Gorbunov V. B. Analytical control of metallurgical refining process of red mud. Izvestiya Vysshikh Uchebnykh Zavedenii. Chernaya Metallurgiya. 2013. No. 9. pp. 17–21.
16. Podgorodetskiy G. S., Shiryaeva E. V., Gorbunov V. B., Kozlova O. N. A Problem of Efficient Red Mud Processing. Search for Solutions. Ekologiya i promyshlennost Rossii. 2015. Vol. 19. No. 12. pp. 46–53.

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