【摘要】 用回转窑焙烧硫铁矿烧渣的磁化焙烧实验研究结果表明:硫铁矿烧渣与还原煤按一定比例混合,经回转窑磁化焙烧,在700℃下焙烧10min、物料填充率为11%时,能有效地将烧渣中弱磁性Fe2O3还原成强磁性Fe3O4,磁化率(ωTFe/ωFeO)可达2.38,接近理论值。通过球磨、磁选工艺,可以大幅度地提高精矿品位和金属回收率。同时,烧渣在回转窑内脱硫效果明显,回转窑倾角为0.8°、转速12r/min时,脱硫率可高达85%以上。更多还原

【Abstract】 The pyrite cinder was roasted by the rotary kiln in the experiment in order to recover iron and decrease sulfur content. When the pyrite cinder is mixed with reducible coal in a certain ratio, the weak magnetic Fe₂O₃ in pyrite cinder is effectively reduced to strong magnetic Fe₃O₄ by magnetic roasting with roasting time of 12 min and filling rate of 11% at 700 ℃ in the rotary kiln, and the magnetic rate is 2.38 which approaches the theory value. After ball-grinding and magnetic separating processes, concentrate grade and recovery percent of metal will be raised. Simultaneously, the effect of desulphurization is obvious and the desulphurization rate exceeds 85% when the inclination of the rotary kiln is 0.8°, and rotating speed is 12 r/min.更多还原