In the laboratory test, a muffle furnace was used to simulate the condition of a rotary hearth furnace and carbon-containing pellets prepared with copper slag, reduction coal and limestone was roasted at 1 400 ℃, yielding granular iron and slag after the process of reduction and melting, which were then separated from each other by hand sorting. Based on the test, effects of roasting time, basicity, types and dosage of each fluxing agent on the reduction-melting process were studied. It is found that pellet with a basicity of 0.42 was roasted for 40 min by adding flux of CaF2 at an amount of 2%,resulted in a high-quality granular iron grading 95.22% TFe at recovery of 91.71%,with S content at 0.37%.%在实验室条件下使用马弗炉模拟转底炉,在1400 ℃下焙烧还原由铜渣、还原煤、石灰石等原料制备的含碳球团,还原熔分生成粒铁和渣,再通过人工挑选的方式实现渣和粒铁的分离.研究了焙烧时间、碱度、助熔剂种类和用量等因素对还原熔分效果的影响,结果表明,在焙烧时间40 min、球团碱度0.42、球团外配助熔剂CaF22%时,可获得铁回收率91.71%、TFe品位95.22%、S含量0.37%的高品质粒铁.
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