微粉炭多量吹き込みを併用した高酸素濃度空気吹き竪型炉による高炭素フェロクロムの製造試験

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タイトル別名
  • Production Test of High-carbon Ferrochrome Using a Shaft Type Furnace with Coke Packed Bed Injected with Highly Oxygen Enriched Air and a Large Quantity of Pulverized Coal
  • ビフンタン タリョウ フキコミ オ ヘイヨウシタ コウ サンソ ノウド クウキ

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High-carbon ferrochrome has been produced by electric arc furnace in Japan. But its production cost has increased because of a speedy rising of electricity cost and Japanese ferrochrome has lost competitiveness in the international market. So, for the purpose of decreasing its production cost, high-carbon ferrochrome production tests (production rate = 50-110kg/ h) were performed using a melting test furnace with coke packed bed injected with highly oxygen enriched air and a large quantity of pulverized coal. Moreover the operation indices of a commercial plant of 35t/d in production capacity were estimated, and following results were obtained.<BR>1) It was confirmed that the reduction and melt down rate of chromium are sinter were superior to that of chromium ore pellet, and the favorable characteristics of chromium ore sinter were obtained as follows: CaO/SiO2 = 1.0-1.3, slag weight = 1100-1300kg/t-(Cr + Fe).<BR>2) It was confirmed that the fuel rate and productivity could be improved under the stable operation by using the chromium ore sinter.<BR>3)The fuel rate of the commercial plant of this process using chromium are sinter was estimated to be 1967kg/t in the case of [Cr] =52.2% with less net energy consumption than that of EAF.

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  • 鉄と鋼

    鉄と鋼 79 (4), 456-463, 1993

    一般社団法人 日本鉄鋼協会

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