Abstract:

A lead一zinc mine in Yunnan produces annually 100 000 t of flotation tailings.  Flotation tailings contains iron 8. 72%, sulfur 0. 94%，phosphorus 0. 14%  and other impurities. Direct storage  of tailings pile can lead to increase mine cost pressures and waste of resources. The rough concentrate was obtained by using weak magnetic-intensity magnetic separation-flotation desulfurization joint process, where in the flotation process uses a thick and sweep process. H₂SO₄ and MHH-1 are mixed as activating agent of pyrite.  Experimental studies joint process of weak magnetic separation showed that qualified iron concentrate could be obtained by a strong magnetic separation一flotation desulfurization，which the Fe content is 58.02%, the impurities content of sulfur, phosphorus are respectively 0.20% and 0.09%, and comprehensive recovery rate is 70. 81%.

Key words: lead一zinc tailings, iron separation, magnetic separation, flotation desulfurization