ABSTRACT

An iron sand concentrate was mixed with coal as the reductant and binder to produce a composite pellet by a mini rotating disc. The pellet was inserted into an alumina crucible and coal was added to maintain the reducing environment by covering the whole surface of the pellet. The reduction was carried out under the isothermal and temperature gradient profile in a muffle furnace where the starting temperature was isothermal at 1000°C, increased with a heating rate of 6.33°C min⁻¹ to a final temperature of 1380°C. The results show that the total iron content increased from 46.9% in the initial pellet to 72.5% in the reduced pellet. The iron nugget formed on the surface of the reduced pellet at 1380°C. The nugget primarily consisted of iron, and the slag mostly consisted of anatase or brookite. The titanium content increased from 4.8% in the initial pellet to 24.4% in the slag.

摘要

将铁砂精矿与作为还原剂和粘合剂的煤混合，通过微型转盘生产复合球团。将球团插入氧化铝坩埚中并加入煤以通过覆盖球团的整个表面来维持还原环境。在马弗炉中等温和温度梯度曲线下进行还原，其中起始温度在 1000°C 等温，以 6.33°C min ^-1的加热速率增加到 1380°C 的最终温度。结果表明，总铁含量从初始球团的 46.9% 增加到还原球团的 72.5%。在 1380°C 时，在还原球团的表面上形成了铁块。矿块主要由铁组成，炉渣主要由锐钛矿或板钛矿组成。钛含量从初始球团中的 4.8% 增加到炉渣中的 24.4%。