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用7种还原剂对美国产的4种铬矿作了(1)未还原球团的熔融还原,(2)球团的预还原;(3)预还原球团的熔融还原的实验。熔融还原采用电孤炉,预还原采用回转窑。在未还原球团的熔融还原实验中,在用半成品焦炭作为还原剂,并根据平炉炼钢用埋孤工艺的场合,铬的回收率很好,Benbow铬矿的回收率达93％。半成品焦炭作还原剂与用他种还原剂相比,耗电可降低24％。其次,初期渣的碱度对铬回收牵影响很大,碱度越高,回收牵越低,(CaO+MgO)/SiO_2值从0.8～1.0最好。但是,如不问矿石种类,将条件限定在一个很小的范围,可生产铬铁。
Four kinds of chrome ore from the United States were made with seven kinds of reducing agents (1) the melting reduction of unreduced pellets, (2) the pre-reduction of pellets, and (3) the experiment of prereduction pellets melting reduction. Melting reduction using an arc furnace, pre-reduction using rotary kiln. In the unreduced pellet smelting reduction experiments, the recovery of chromium was good with semi-finished coke as a reductant and under an open burying process for open hearth steelmaking, with Benbow chrome recovery of 93%. Semi-finished coke as a reducing agent with his kind of reducing agent, the power consumption can be reduced by 24%. Secondly, the alkalinity of the initial slag has a great influence on the recovery of chromium. The higher the basicity, the lower the recovery and the lower the value of (CaO + MgO) / SiO 2 is from 0.8 to 1.0. However, if you do not ask the type of ore, the conditions are limited to a very small range, can produce ferrochrome.