A Study on the Recovery of Iron from Copper Slag with Temperature

摘要

Copper smelting slag is an industrial by-product obtained from the process of smelting copper, and about 1.5 million tons of smelting slag is generated annually. Since the copper smelting slag contains high content of Fe, Cu and valuable metals, interest in recycling it is increasing. The high Fe content in the copper smelting slag can be used as a high-value element that can replace the foundry pig iron. Therefore, this study was intended to recover Fe-Cu alloy from the copper smelting slag by a high-temperature reduction method. To this end, the basic properties and thermodynamic reaction behaviors of the copper smelting slag were examined, and the recovery behavior of Fe and Cu from the copper smelting slag according to reaction temperature was observed. As a result, it was confirmed that the whole of the slag should smelted to recover the Fe-Cu alloy, and that slag smelting behavior became active with increasing reaction temperature. The whole of Fe in the slag was recovered at the reaction temperature of 1600°C and the recovery rate of Fe and Cu was increased with increasing reaction temperature.