Abstract:Iron content in copper slag is 30%—45%, which is higher than grade of industrial recoverable iron ore. However, iron in copper slag mainly exists in fayalite, making it difficult to extract and recycle. Iron resources in copper slag were recovered by microwave reduction and magnetic separation process with copper slag as raw material and biomass carbon as reducing agent. The results show that iron grade in iron concentrate after magnetic separation is 85.9% with iron recovery of 89.1% under the optimal reduction condition of copper slag-biomass composite pellets including reduction temperature of 1 473 K, reduction time of 90 min, and CaO addition of 15% of mass of copper slag.