Recovery of iron from cyanide tailings with reduction roasting-water leaching- magnetic separation

摘要

Cyanide tailings have become one kind of the most hazardous solid waste. In order to recycle iron in the cyanide tailings, we present a technique using roasting- water leaching- magnetic separation. After analysis of the different parameters on recovery efficiency of iron, the optimum reaction parameters were proposed as the following: in reduction roasting process, weight ratios of cyanide tailings/activated carbon at 100:10, roasting at 750°C; the liquid to solid ratio is 15:1 (ml/g), leaching at 60°C for 5 min at water leaching. The grade of magnetic concentrate 53.8231%Fe and recovery rate of 76.5458% were obtained. Mineralography of roasted product, water-leached sample were studied by X-ray powder diffraction technique (XRD).