In the process of extracting iron from copper slag, the iron obtained by reduction is difficult to use because of the high content of copper and sulfur. In this paper, the thermodynamics of CO_2 desulphurization of slag is simulated using FactSage 7.1. In tube furnace, the desulfurization of copper slag was investigated by changing the temperature and flow rate of CO_2. Thermodynamic simulation using FactSage 7.1 shows that increasing temperature and flow rate of CO_2 can promote the removal of sulfur, and the desulfurization rate can reach up to 54.97%. The experiment shows that the removal trend of sulfur in the slag is the same as that of the thermodynamic calculation, and the maximum removal rate is 56.64%. The utilization rate of CO_2 increased with the increase of temperature, but decreased with the increase of CO_2 flow rate. Compared with air, CO_2 is not easy to cause slag peroxidation.
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