Mineral processing technologies used to obtain valuable components of the solid wastes from coal combustion in power plants

This paper presents mineral processing technologies used to achieve components from solid wastes of coal combusted in power plants. By combusting bituminous coal in smelting boilers, mineral novelties are formed which are separable by suitable mineral processing technologies. The separation of unburned coal residues is realized by flotation, using nonionic flotation agents such as Flotalex MR, Flotalex bio, Flotakol NX and others. The Fe component created by the mineral novelty of magnetite is obtained by wet and dry low-intensity magnetic separation. Optimal results were accomplished by the flotation process in which we obtained residues of unburned coal. The waste from the flotation was consequently separated by the wet low-intensity separation. The waste from the flotation and magnetic separation - subtilized fly ash, contained 0 – 2,5% LOI which can be used in architecture.