PROCESSING METHOD OF ASH-SLAG MATERIALS OF COAL-FIRED POWER STATIONS Russian patent published in 2014 - IPC C07F7/00 C01F7/02 B09B3/00 

FIELD: power industry.

SUBSTANCE: invention relates to power engineering, and namely to a processing method of ash-slag materials (ASM) of coal-fired power stations, and can be used when obtaining aluminous concentrate and belite slurry for purposes of the aluminuos and construction industry. The processing method of the ash-slag materials of the coal-fired power stations involves activation of the ash-slag materials and separation of processing products so that silica and alumina can be obtained. The method differs by the fact that hydraulic classification of th ash-slag materials is performed as per Class 45 mcm so that two fractions are obtained: +45 mcm and slightly magnetic fraction -45 mcm, fraction +45 is subject to magnetic separation so that magnetic concentrate and tail ends of magnetic separation are obtained; the magnetic separation tail ends are subject to flotation so that carbon concentrate and floatation tail ends are obtained; the floatation tail ends with classification of less than 45 mcm and slightly magnetic fraction -45 is combined into a common fraction with further dilution of the common fraction in a sodium hydroxide solution, separation of the obtained pulp into a cake rich in alumina, and a sodium silicate solution; after that, the cake is processed into alumina, and the sodium silicate solution is recovered by lime.

EFFECT: eliminating disadvantages of known technical solutions by changing implementation of the method and increasing full ASM processing owing to obtaining quality target products from them in the form of alumina and high-disperse silica, which are maximum cleaned from hazardous impurities limited by GOST (manganese, chrome, sulphur, zinc, iron, phosphorus, etc).

2 cl, 9 tbl, 2 ex