PROCESSING OF FLY ASH AND MANUFACTURE OF PRODUCTS CONTAINING COMPOSITIONS BASED ON FLY ASH Russian patent published in 2018 - IPC C04B35/16 C04B35/626 

FIELD: technological processes.

SUBSTANCE: composition based on fly ash is formed from a mixture based on fly ash, containing more than 70% of fly ash on a composition dry weight basis, a plasticiser used for binding particles of fly ash in the composition, and optionally, one or more ceramic additives. The mixture is ground so that the average particle size of the composition is less than 35 microns. A raw product of the desired shape, having a thickness of less than 40 mm, is formed from a mixture of water and the mentioned powdered composition based on fly ash and the plasticiser by pressing the mixture at a pressure of more than 200 kg/cm², after which the water content in the raw product is less than 12% of the total mixture weight, and the bending strength of the raw product is greater than 1.5 kg/cm². The method can optionally comprise a preliminary fly ash screening operation or a fly ash decarbonization operation, so that the fly ash has a value of POI (percentage of other impurities) less than 2%.

EFFECT: products have low water content and have sufficient strength in raw state, so that they can be transported and processed using industrial equipment.

17 cl, 1 ex, 2 tbl, 5 dwg