以新疆磁铁精矿为原料，采用一步法直接还原，研究高强度、高还原性预热球团的制备及煤基直接还原的工艺。研究了实验室转鼓模拟回转窑装置中直接还原铁的生产工艺。讨论了配碳比、反应温度、反应时间等工艺参数对金属化率、脱硫率等回转窑直接还原铁的主要质量指标的影响，提出了本试验原料条件下，回转窑生产直接还原铁的最佳工艺参数。研究结果表明，对于铁品位为6439%(质量分数，余同)的新疆磁铁精矿，将预热球团在1025℃还原70min，得到直接还原铁(DRI)的质量指标为：金属铁的质量分数大于93%，金属化率达到9548%~9725%，硫的质量分数小于0010%。与传统的预热-高温氧化-高温还原煤基回转窑直接还原工艺相比，“一步法”省去了高温氧化这一高能耗(1150~1300℃)工序，且还原所得产品结构完整。
Using Xinjiang magnetite concentrate, the process for preheated pellets with high strength and easy reduction, and coalbased direct reduction iron (DRI) were studied by novel onestep process for direct reduction. DRI production process of simulating tests of rotary in laboratory was studied. Influence of carbon capacity adding, reduction time, reduction temperature on the degree of metallization, sulphur content of rotary kiln DRI was analyzed. The best direct reduction process parameter of rotary kiln DRI production in this raw material conditions was proposed. The results show that for Xinjiang magnetite assaying with 6439%Fe, preheated pellets are directly reduced at 1025℃ for 70min, directly reduced iron (DRI) assaying 93% metallic iron and 9548% metallization degree are achieved. Compared with the traditional direct reduction of fired oxide pellets in coalbased rotary kilns, onestep process for direct reduction can avoid high temperature oxidation of pellets at 1150-1300℃, and possesses some advantages such as: greater economic profit, good quality of direct reduced iron.
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