METHOD FOR DRY GRAVITATIONAL-ELECTRIC COAL IMPROVEMENT Russian patent published in 2022 - IPC B07B13/00 B03C9/00 

FIELD: materials enrichment.

SUBSTANCE: the proposed invention relates to the field of materials enrichment using gas or air flows and can be used, in particular, for dry enrichment of coals and other minerals, the separated components of which differ in density and typically have close electrical conductivity. The method of dry gravity-electric coal dressing includes ore preparation, thermal processing and electrical separation of the raw material. Thermal treatment is carried out at a temperature of 200 to 300°C and simultaneous vibration exposure at a vibration frequency of 50 to 200 Hz, to obtain a specific heavy product which is sent to a tailing dump and a specific light product which is directed to triboelectrostatic separation with an electric field strength of 5 to 10 kV/cm to obtain a coal concentrate and tailings.

EFFECT: the technical result is an increase in the efficiency of separation and an increase in specific productivity.

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