煤基铁矿粉催化还原试验研究

Experimental Research on Ore Fine Reduction by Coal With Addition of Catalyst

通过煤粉还原铁矿粉试验,研究了反应罐工艺模式下催化剂对煤基铁矿还原反应的催化规律。试验结果表明:通过配加催化剂的方式可以显著加快铁矿还原反应速度,其中向煤粉中加入催化剂的催化效果要好于加入矿中;增加催化剂配加量、降低反应温度和减小煤粉粒度均有利于改善催化剂的催化效果,适宜的催化剂配加量应小于5%,考虑到布料操作和反应效率的影响,煤粉粒度和添加催化剂后的反应温度应控制在0.074～0.15mm和1050～1100℃;此外,煤种对催化剂的催化效果也有较大影响,煤粉的固定碳含量越高越有利于催化剂发挥显著的作用。

The catalytic rule of coal-based iron ore reduction was investigated by experiments of iron oxide reduction under tunnel furnace pattern. The results indicate that the rate of reaction can be accelerated by addition of catalysts and the catalytic effect of adding catalysts to the coal is better than other adding modes; increasing the amount of catalysts and reducing the reaction temperature and the sizes of coal powder are favorable to the catalytic effect, the optimizing addition should be less than 5 %, considering of the influence of operation and the efficiency of reduction reaction, the optimizing particle size of coal powder and temperature of tunnel furnace after adding catalysts should be 0. 074-0.15 mm and 1050-1 100 ℃; at the same time, the catalytic effect to coals of the same catalyst is different and the more fixed carbon content the better catalytic effect.