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本文研究了微波加热铁矿石作为传统还原过程的替代方法以解决热传导缓慢问题。微波加热和还原试验是采用煤和磁铁矿精矿制作的组合生球(团矿)进行的。使用15KW的微波发生器对粉状球化的两种给料进行了实验室规模的试验。大大增加了还原速度。对于混料中超过20%化学当量的碳在温度约1000℃情况下,大约10分钟就能使90%以上的铁矿石还原。使用煤通过微波加热还原铁矿石能产生可以用于有关热力作业的一种纯洁、无尘、高Btu(英国热量单位)的烟气。根据纯度,还原的铁产品可直接给到电弧炉进行冶炼。在某些情况下可要求去除炉相,以消除过多的二氧化硅和铝土。
In this paper, microwave heating of iron ore as an alternative to the traditional reduction process to solve the problem of slow heat transfer. Microwave heating and reduction tests were conducted using a combination of pellets (pellets) made of coal and magnetite concentrate. Both feed powders were tested on a laboratory scale using a 15 kW microwave generator. Greatly increased the speed of reduction. More than 20% of stoichiometric amounts of carbon in the blend can reduce more than 90% of the iron ore in about 10 minutes at about 1000 ° C. The use of coal to reduce iron ore by microwave heating produces a pure, dust-free, high-volume Btu (British Thermal Unit) flue gas that can be used for thermal operations. Depending on the purity, the reduced iron product can be smelted directly to the electric arc furnace. In some cases it may be desirable to remove the furnace phase to eliminate excess silica and alumina.