【摘要】 基于铁矿石还原热力学原理,研究了超细赤铁矿粉的还原温度.采用超级涡流磨,制得平均粒度为2μm的超细赤铁矿粉.实验中采用氢气与CO两种还原性气体分别对不同粒径的铁矿粉进行还原实验,粒度分别为0.2mm的赤铁矿粉和2μm的超细赤铁矿粉.研究发现,细磨的超细赤铁矿粉还原温度较低,在750℃左右即可全部还原.微米级的超细赤铁矿粉比毫米级的赤铁矿粉还原温度下降了100℃左右;同时氢气还原性能较CO要好,这是由于析碳反应的存在,CO还原过程中失重不稳定,而H2还原铁矿石则不会出现这种情况.这为下一阶段铁矿粉低温直接还原工业性试验奠定了基础.更多还原

【Abstract】 Based on the thermodynamic principle of iron ore reduction, the reduction temperature of ultra-fine hematite power was studied. The ultra-fine powder was prepared by super-eddy milling, leading to the average particle size of 2 μm. The reduction experiments were carried out using hydrogen and CO gas to treat the iron ore with different sizes, 0.2 mm and 2 μm. The results indicated that the milled ultra-fine hematite power could be reduced completely at a lower temperature about 750℃. The reduction temperature of micro-class iron ore was lower 100℃ than mm-class one, and the reducibility of hydrogen was better than CO due to the existence of carbon deposition. Weight loss was unstable in the reduction process with CO, this situation did not happen in the reduction process with H2. This may lay the foundation for industrial low-temperature experiment.更多还原