Abstract: Aiming at the problem of low grade of copper concentrate in the process of copper-sulfur separation caused by the change of raw ore properties in Longqiao Mining Concentrator，an experimental study on the effect of activated carbon on copper-sulfur separation was carried out. Through laboratory flo‐ tation tests，the effects of coconut shell charcoal，wood charcoal and coal charcoal on the grade，recovery rate and separation efficiency of copper concentrate at different dosages were systematically investigated. The results show that activated carbon can effectively improve the grade of copper concentrate，and coco‐ nut shell carbon has the best effect. The industrial test of activated carbon addition point further verifies that the addition of activated carbon in the separation roughing stage can significantly improve the copper concentrate grade to more than 18%，and does not affect the copper recovery rate，which provides a reli‐ able basis for on-site process optimization.

Key words: activated carbon, copper-sulfur separation, coconut shell carbon