Abstract: According to the feature of a iron tailings after magnetic separation with copper thickness of inequality,high secondary copper sulfide, and part of chalcopyrite wrapped by pyrite, before the original process of Cu-S bulk flotation-Cu-S separation added speed flotation, and corried out the optimized research on regrinding of mixed concentrate and separation process. Using the closed circuit process of partical-differential flotation, can get the copper concentrate with 21.48% grade and 82.85% recovery, S concentrate with 48.34% grade and 84.43% recovery. The copper recovery of test 10 percent points higher than production.

Key words: Iron tailings of magnetic separation, Cu-S separation, Partial-differential flotation