METHOD OF CONCENTRATION OF COAL SLUDGES Russian patent published in 2007 - IPC B03B7/00 B03D3/00 

FIELD: concentration of minerals; coal concentrating plants for producing coal concentrate from coal sludge.

SUBSTANCE: proposed method consists in pulping the starting material followed by separating the grain coal part from rock component by hydraulic classification in vertical gravity-type hydraulic classifier where grain part is separated from rock component due to difference in size of grains and density of medium in ascending flow of water carrying the suspended rock part and entrapping the rock component in thickeners. Rock component is entrapped in thickener by means of polyfunctional material used as filtering, coagulating, flocculating, sorbing, draining and water-repellent layers; this material is subjected to regeneration at release of rock part. Water passed through water-repellent layer is returned to hydraulic classifier for washing-off the coal, thus completing the circulating cycle. Concentrated grain coal part obtained in hydraulic classifier is subjected to dehydration in centrifuge for separation of centrifuged effluent in circulating water storage tank and coal concentrate which is mixed with binder in mixer and is directed afterwards for granulation and subsequent drying.

EFFECT: enhanced efficiency of extraction of combustible mass from coal sludge.

1 dwg, 1 ex