Abstract: With coking coal as reducing agent,the reduction roasting-magnetic separation process was adopted to recycle iron from the smelting slag which was produced by a gold smelter in Henan province.The smelting slag,total iron grade of which was 35.91%,had a high recycling value.But the particle size of the slag was very fine (-0.025mm 73.71%),and the chemical composition was complex.According to this characteristic,the effects of roasting temperature,time,amount of reducing agent,grinding fineness and magnetic field intensity on ore dressing indexes were discussed.The test showed that,the optimum conditions were as follows:the slag was roasted at 1150℃ for 60 minutes with coal consumption 13%,and then ground it to -0.045mm accounted for 74.55%,with magnetic field intensity 60kA/m.As the conditions,roasting-magnetic separation process obtained good indexes:the total iron grade of iron concentrate was 93.21% and the total iron recovery was 82.72%.