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SLAG FORMATION IN THE REDUCTION ZONE USING COKE DURING HIGH CARBON FERROMANGANESE PRODUCTION USING SOUTH AFRICAN MANGANESE ORES
Abstract
It has been observed that during high carbon ferromanganese using South African ores, some practices do not find an easy answer from the theory and vice-versa. It has therefore become important to study under different reducing conditions what paths does the slag go through while forming during reduction in order to better understand its formation while higher manganese oxides are being reduced. The carbon monoxide gas amount and availability in a specific zone albeit its origin is influential and explanatory toward the degree of reduction and the formation of phases. The current investigation focused on the slag formation with the use of coke. The initial basicity of 1.25 was decreased by adding Silica to lower to a value of 1. The flux and the manganese ore were milled together for 15 minutes to homogenise the head sample and ensure same behaviour of the feed throughout. Graphite crucible was used in a alumina tube for experiments. Argon was blown in the furnace from room temperature to 600oC and switched off to allow carbon to start reducing the manganese ore until the set temperature was reached. The sample was kept for two hours at the set temperature, then the furnace was switched off. Argon gas was switched on from 600 oC to room temperature. The temperatures used were 1200 oC and 1350 oC. XRF, XRD and SEM-EDS were used for characterization. Phases present in the slag that formed were therefore identified. A comparison was made between the slag quality obtained here and when only carbon monoxide was used for reduction means.
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Wa Kalenga M.K., Xiaowei P., Merete T., Manganese Alloys Production: IMPACT of Chemical compositions of raw materials on the energy and materials balance. The thirteenth International Ferroalloys Congress, June 9 - 13, 2013, Almaty, Kazakhstan pp 647 – 653
Coetsee T., Zietsman J. and Pistorius C., Predicted effect of ore composition on slag formation in manganese ore reduction, Journal of Mineral Processing and Extractive Metallurgy 123 (3), pp 141-147
Sitefane M., and Kalenga, M. On the Possibility of using manganese carbonates Ores in the Ferromanganese Industry. Journal Metallurgist. Volume 62 Number 1-2, pp. 23-29.
Ishak R. and Merete T., Degree of Prereduction without Coke consumption in Industrial Furnaces. International Ferroalloys Conference (Infacon XI), February 18 – 21, New Dheli/ India; Proceedings, pp 268-280, 2007.
Bambang S., Adi N., Deni F. and Fajar N., Effect of Basicity on Ferromanganese Production from Beneficiated Low-Grade Manganese Ore. Proceedings of the 1st International Process Metallurgy Conference (IPMC 2016), 1805, 040002 (2017); DOI: 10.1063/1.4974423
Olsen, S.E. & Tangstad, M. The importance of slag basicity in the production of high carbon ferromanganese: Proc. of the 53rd Electric Furnace Conf. (Orlando, Fl. November 12–15, 1995). P. 93–98
Olsen, S.E. The slag basicity concept in the HC FeMn process: Proc. of the Ninth International Congress on Ferroalloys INFACON 9 (Quebec City. June 3–6, 2001). P. 280–285.
Olsen, S.E. & Tangstad, M. The importance of slag basicity in the production of high carbon ferromanganese: Proc. of the 53rd Electric Furnace Conf. (Orlando, Fl. November 12–15, 1995). P. 93–98
Tang K. and Olsen, S., The effect of alumina in ferromanganese slag. International Ferroalloys Conference (Infacon XI), February 18 – 21, New Dheli/ India; Proceedings, pp 335-343, 2007.
Tang, K. and Olsen, S.E: Metallurgical and Materials Transactions, 2006, vol.37.B, pp. 599-606.
Makhubele, M., Singo, M., Kalenga, M. and Mulaba-Bafubiandi, A.F. FERROMANGANESE PRODUCTION: The use of biochar in the reduction of South African manganese ores, preliminary study. The Fifiteenth International Ferro Alloys Congress, 23-25 February 2018, Cape Town, South Africa. Proceedings under edition.
Olsen, S.E, Tangstad, M. and Lindstard T. Production of Manganese Ferroalloys. Pp.94 (2007)
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