METHOD OF HYDROCHEMICAL PROCESSING OF NEPHELINE SLUDGE Russian patent published in 2017 - IPC C04B7/24 

FIELD: chemistry.

SUBSTANCE: method consists in hydrochemical processing og nepheline sludge for the production of portland cement clinker by the impact on the sludge with carbon dioxide in an aqueous medium at a temperature of 25-95°C for 2-6 h and subsequent treatment in an alkaline solution. Herewith the original flow of nepheline sludge is divided into two parts, one of which is subject to hydrochemical processing to obtain the product that meets a molar ratio CaO/SiO₂>3, and then mixed with the second part of nepheline sludge to achieve the composition of the raw mixture required to obtain alite clinker.

EFFECT: reduction of the flow of nepheline sludge entering the hydrochemical processing and materials entering the auxiliary technological operations for product separation and washing of the sludge, which results in a reduction in the costs of their implementation.

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