A new process is proposed for recovering copper from smelting slag using waste cooking oil as a green reductant. More than 70% of waste cooking oil pyrolysis products is hydrogen. In this study, a 70% H_2-30% N_2 gas mixture was used to simulate pyrolysis products for copper slag reduction experiments. The equilibrium composition, oxygen potential, reduction degree of Fe_3O_4 and the content of copper dissolved in the slag were calculated using FactSage software. The experimental results show that the Fe_3O_4 in the slag is reduced from 12.9 to 2.9%, and the copper from 17.82 to 0.53%. The unrecovered copper is mainly dissolved in the slag.
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