1992 年 32 巻 10 号 p. 1058-1065
High-carbon ferrochrome has been produced by electric arc furnace, but its production cost is very high because of the high electricity cost in Japan. So, for the purpose of decreasing its production cost, experiments of high-carbon ferrochrome production (production rate=50-110 kg/h) were performed using an experimental melting furnace with coke packed bed injected with oxygen and a large quantity of pulverized coal and following results were obtained.
(1) In the experimental plant, high-carbon ferrochrome of [Cr]=40-60% was produced by this process.
(2) It was confirmed that sintering of chromium ore had the effects to improve the characteristics of the reduction and melt down of chromium ore and the favorable characteristics of chromium ore sinter were cleared as follows: CaO/SiO2=1.0-1.3, slag rate=1100-1300 kg/t-(Cr+Fe).
(3) It was confirmed that the fuel rate and productivity could be improved under the stable operation by using the chromium ore sinter as a material.
