Leaching Characteristics and Utilization Risk of Heavy Metal Ferrochromium Slag

Open storage, landfill disposal and resource utilization of ferrochromium slag may have environmental risks because of containing heavy metals. The ferrochromium slag sample from a ferrochrome smelter in Chongqing city was taken as an example and the leaching experiment performed adopting national standard leaching methods. The results showed that the leaching concentrations of heavy metals such as V, Cr, Mn, Ni, Zn, As, Se of the water quenched slag, dry slag and old slag were much lower than the hazardous waste identification standards, among which the leaching concentration of Cr was 0.033 8, 0.012 2 and 0.027 8 mg/L, respectively for the three slags. Therefore, ferrochromium slag should belong to general industrial solid wastes, which means that ferrochromium slag can be disposed of in a landfill as general industrial solid waste and the environmental risk of the recycled products from it should be paid more attention to.