Orthogonal Experiments of Copper Slag Particles Direct Reduction by Carbon-Containing Solid Waste Reductant

Copper slag particles were prepared by rotary cup atomizer. Carbon-containing copper slag pellets were prepared by copper slag particles, carbon reductant, binder and slag former. The effects of six factors on reduction ratio of carbon-containing copper slag pellets were in accordance with the sequence of reaction temperature > the ratio of slag former > atmosphere > the types of reduction reductant > particle size of copper slag > the addition ratio of reductant, under experiment conditions. The optimum condition for direct reduction of carbon-containing copper slag pellets was that the reaction temperature was 1150℃, the ratio of slag former was 1∶0.4, atmosphere was CO₂(50%)+N₂(50%), the reductant was coal, particle size of copper slag was +0.425 mm and the addition ratio of reductant was 1.2∶1. On this condition, the reduction ratio of copper slag is 98.2%.