METHOD OF PROCESSING NEPHELINE CONCENTRATE Russian patent published in 2019 - IPC C01B39/14 C01B39/22 

FIELD: technological processes.

SUBSTANCE: invention relates to the preparation of zeolites from nepheline concentrate. method for processing nepheline concentrate, which is a waste of a processing plant for processing apatite-nepheline ores, is proposed. Nepheline concentrate is ground to a particle size of less than 250 microns, sintering of the concentrate with caustic soda is carried out at 300–340 °C for 2.5–4.0 hours, add the sodium silicate solution, alkaline solution and distilled water to obtain a reaction mixture for the synthesis of zeolites NaA or NaX. Hydrothermal synthesis is carried out for 12–36 h, the precipitate is filtered, washed with water until pH=8, dried and calcined, and the basic solution after filtration is returned to the stage of obtaining the reaction mixture.

EFFECT: technical result of the invention is to provide the possibility of obtaining type A and X zeolites from the waste of the beneficiation plant for processing apatite-nepheline ores.

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