Abstract
There was examined flotation method of ashes and slags materials’ treatment from power plants. There was proposed distinctive method for ash and slag waste’s preparation before their subsequent treatment by means of biological leaching. Principle of proposed method is following. Ash wastes that generated during the coal burning are mixed with obtaining of fine suspension, in which carbon-bearing reagent is added. Flotation treatment of water suspension is carrying out at mechanical flotation machine with flotation time 15-18 min and air flow 0, 7-0, 8 m3/min. Flotation tail in the form of cleaned ash suspension enters for separation in open hydro cyclone. In doing so thickened product in the form of ashen product with moisture about 85-90 per cents diverts at special storage yard, and drainage from hydro cyclone is treated by cation-active flocculate, for example “Praestol” type, and afterwards directs to cleaning and pressure flotation plant. There were positive results obtained with improved efficiency of rare earth metals extraction by means of biological leaching.
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