铁矿石烧结中配加PMC粉试验研究

Experimental Study on Adding PMC Powder in Iron Ore Sintering

PMC粉是一种铜矿的尾矿,其铁品位相对较高,在烧结中具有一定的使用价值,为开发利用烧结用铁矿石新资源,首钢京唐对烧结配加PMC粉开展了烧结杯试验研究。研究结果表明:PMC粉全铁品位达到62.00%,属于磁铁精粉,其w(TiO_(2))高达2.22%,大量配加会导致烧结矿中TiO_(2)含量升高,不利于烧结矿低温还原粉化性能;配加PMC粉后混合料中核颗粒减少、黏附粉比例增加,会导致料层透气性变差,从而使垂直烧结速度呈现降低趋势;随着PMC粉配比的升高,烧结矿成品率呈现升高趋势,固体燃耗有所降低,当PMC粉质量配比为3%时达到最低水平,降低约2.3 kg/t;虽然配加PMC粉会降低垂直烧结速度,但是烧结矿成品率提高,因此烧结利用系数基本不变;配加PMC粉后,烧结矿平均粒径增加1~2 mm,粒度组成改善明显。

PMC powder is a tailings of copper ore with a relatively high iron grade,which has certain practical value in sintering.In order to develop and utilize new resources of iron ore for sintering,Shougang Jingtang conducted a sintering cup test on the addition of PMC powder in sintering.The research results show that the total iron grade of PMC powder reaches 62.00%,which belongs to magnetic refined powder.Its w(TiO_(2))content is as high as 2.22%,and a large amount of addition will lead to an increase in TiO_(2) content in the sintered ore,which is not conducive to the low-temperature reduction pulverization performance of the sintered ore.The addition of PMC powder reduces the number of core particles and increases the proportion of adhesive powder in the mixture,which leads to a decrease in the permeability of the material layer and a decrease in the vertical sintering speed.With the increase of PMC powder ratio,the yield of sintered ore shows an upward trend,and the solid fuel consumption decreases.When the PMC powder mass ratio is 3%,it reaches the lowest level,reducing by about 2.3 kg/t.Although adding PMC powder can reduce the vertical sintering speed,the yield of sintered ore increases,so the sintering utilization coefficient remains basically unchanged.After adding PMC powder,the average particle size of the sintered ore increased by 1~2 mm,and the particle size composition improved significantly.