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在直径为80mm的竖式预还原炉内设置带有多孔的隔板,以便将炉内区分为原料铬矿供给侧的氧化铁的优先还原区与预还原生成物排出侧的氧化铬的促进还原区。从还原炉的底部导入含有CO、N_2、H_2的高温流态化还原气体,通过气体分布板而使其上部的粉、粒状铬矿沸腾而形成沸腾层以便能够进行沸腾还原。铬矿在氧化铁优先还原区于1100℃下首先进行氧化铁的优先还原,然后一边沸腾一边
A separator having a porosity was provided in a vertical prereduction furnace having a diameter of 80 mm so as to separate the inside of the furnace into a preferential reduction zone of iron oxide on the feed chrome ore supply side and a reduction reduction of chromium oxide on the discharge side of prereductioned product Area. A high-temperature fluidized reducing gas containing CO, N 2, and H 2 is introduced from the bottom of the reduction furnace, and the upper portion of the powdery and granular chromium ore is boiled through the gas distribution plate to form a boiling layer for boiling reduction. Chromium ore is first preferentially reduced in iron oxide at 1100 ° C in the preferential reduction zone of iron oxide and then boiled sideways