以TFe品位为30.71%的河南某焙烧氰化尾渣为原料，采用湿式强磁预选?磁化焙烧?磁选联合工艺制备铁精粉. 结果表明，当强磁预选的磁场强度为1511.54 kA/m时，得到TFe品位44.96%、回收率78.27%的粗精矿；以该粗精矿为磁化焙烧原料，配10wt%焦粉，于750℃下磁化焙烧45 min，焙烧样经二段磨矿、二段弱磁选，当二段磨矿细度小于0.028 mm占63.9%时，可得TFe品位61.71%、回收率68.66%的铁精粉；产率为16.79%的弱磁选尾矿不含氰化物，转化为一般工业固体废物. 焙烧温度低于700℃时，部分赤铁矿未还原；焙烧温度超过800℃时，生成的磁铁矿转化成镁铁矿、铁橄榄石和方铁矿，磁铁矿含量降低，导致铁损失；焙烧温度为750℃时，磁铁矿含量最高.

The combined process, high intensity magnetic preconcentration?magnetization roasting?magnetic separation, was used to prepare iron concentrate from roasted cyanide tailings with TFe grade of 30.71% in Henan province. The results showed that rough iron concentrate with TFe grade of 44.96% and recovery rate of 78.27% was obtained with high intensity magnetic separation at the magnetic field intensity of 1511.54 kA/m. The rough iron concentrate mixed with 10wt% coke powder was roasted at 750℃ for 45 min. The roasted product was further treated with two-stage grinding and two-stage magnetic separation. The iron concentrate with TFe grade of 61.71% and recovery rate of 68.66% was obtained at the grinding fineness of less than 0.028 mm of 63.9%. Magnetic separation tailings, with a yield of 16.79%, could be classified as common industrial solid wastes due to no residual cyanides. Some hematite was not reduced at the temperature of below 700℃,and reduced magnetite could be further transformed to magnesioferrite, fayalite and wustite at the temperature of above 800℃, which reduced the content of magnetite and resulted in loss of iron in the magnetic separation. As the roasting temperature was 750℃, the highest content of magnetite in roasted samples was achieved.