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以新疆蒙库高品位磁铁精矿为原料,采用预热球团一步法煤基直接还原工艺制取铁.考察了不同预热制度下预热球的质量,以研究预热工艺在磁铁精矿球还原中的作用效果,其中预热球的抗压强度和粉未率是衡量预热工艺作用效果的重要指标.通过链篦机预热处理生球以提高预热球强度,有效降低干球粉末率.由实验结果确定最佳预热制度.在预热温度800～850℃、预热时间15～18min、预热风速1.5～1.8m/s、料高100mm的预热条件下,得到的预热球团抗压强度为600N/个以上,比其他预热制度下得到的预热球团抗压强度有较大提高.由扩大型全流程实验可知,在该条件下得到的直接还原铁质量完全达到生产要求.
Taking Mongolian high-grade magnetite concentrate as raw material, a preheated pellet one-step coal-based direct reduction process was used to make iron.Preheating the mass of the preheated ball under different preheating conditions was investigated to study the effect of preheating process on magnetite concentrate Ball reduction in the role of effect, in which the preheat ball compressive strength and powder rate is a measure of pre-heating effect of an important indicator of the effect through the grate pre-heat treatment of raw balls to improve preheating the ball strength, effectively reduce the dry ball Powder rate.The optimum preheating system was determined from the experimental results.Under the preheating conditions of preheating temperature of 800 ~ 850 ℃, preheating time of 15 ~ 18min, preheating wind speed of 1.5 ~ 1.8m / s and material height of 100mm, Preheated pellets compressive strength of 600N / above, than other preheating system obtained preheated pellets compressive strength has been greatly enhanced by the full-scale experimental results show that under the conditions of the obtained direct reduction iron Quality fully meet the production requirements.