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中文摘要：
以新疆磁铁精矿为原料,采用“一步法”直接还原,研究粘结剂种类和润磨方式对生球质量的影响,高强度、高还原性预热球团的制备及煤基直接还原的工艺.研究结果表明,对于铁品位为69.21%的新疆磁铁精矿,采用润磨工艺,并添加粘结剂XB能明显改善生球质量;干燥后的生球在800 ℃预热10 min后,球团抗压强度达到581 N/个,将预热球团在1 050 ℃还原80 min,得到直接还原铁（DRI）的质量指标为：总Fe含量为90.33%,金属铁含量为85.05%,金属化率达到94.15%.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（1 150～1 300 ℃）工序,且还原所得产品结构完整,外表光滑,无裂纹.
英文摘要：
Xinjiang magnetite concentrate was studied by novel one-step process for direct reduction. The effects of binder and damp mill on green balls, the process for preheated pellets with high strength and easy reduction, and coal-based direct reduction iron （DRI） were studied. The results show that for Xinjiang magnetite assaying with 69.21% Fe, damp milling and adding agent XB can improve the quality of green balls obviously. After drying, green balls are preheated at 800 ℃ for 10 min, pellets with compressive strength of 581 N/pellet are achieved. And preheated pellets were directly reduced at 1 050 ℃ for 80 min, directly reduced iron（DRI） assaying 90.33% total iron and 85.05% metallic iron and 94.15% metallization degree are achieved. Compared with the traditional direct reduction of fired oxide pellets in coal-based rotary kilns, one-step process for direct reduction can avoid high temperature oxidation of pellets at 1 150-1 300 ℃, and possesses some advantages such as： greater economic profit, good quality of direct reduced iron.
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