flotation (hematite flotation) or indirect flotation (quartz flotation) techniques depending upon the nature of the available ore bodies. In direct flotation, iron bearing mineral, mostly hematite, is floated using oleate as collector leaving siliceous gangue, usually quartz, in the tailings. Kick et al. 
Flotation Desulfuration Iron Ore Crusher USA. About flotation desulfuration iron orerelated information:a. abutment in coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abu.