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采用深度还原技术处理浸染微细粒度的复杂难选铁矿石,控制铁颗粒粒度是分选出合格产品的关键.根据深度还原物料中铁颗粒的球形特征,通过测量铁颗粒二维截面参数,求取了其累计粒度特性曲线,定性地描述了不同深度还原工艺对铁颗粒粒度的影响规律.结果表明:适当的提高还原温度、延长还原时间、增大配碳系数,都有利于铁颗粒的长大,但还原温度过高、配碳系数过大将阻碍铁颗粒长大;适宜的工艺条件为:还原温度1 225℃,还原时间30min,配碳系数2.0,获得铁颗粒的d50为278.88μm.
Depth reduction technology is applied to deal with complex refractory iron ore with fine grain size and iron particle size control is the key to select qualified products.According to the spherical features of iron particles in deep reduction material, by measuring the two-dimensional cross-section parameters of iron particles, The cumulative particle size characteristic curves of the iron particles were characterized qualitatively and the results showed that proper increase of the reduction temperature, , But the reduction temperature is too high, with the carbon coefficient is too large will impede the growth of iron particles; suitable process conditions: reduction temperature of 1 225 ℃, reduction time 30min, with a carbon factor of 2.0 to obtain iron particles d50 278.88μm.