COAL CONCENTRATION METHOD Russian patent published in 2007 - IPC B03B1/02 B03B7/00 

FIELD: processes for separating carbon-containing component of natural coal, coal slime or waste materials of coal concentration, possibly in coal, fuel and metallurgical industry branches for producing high-grade, high-calorie, low ash content coal.

SUBSTANCE: method for concentrating coal comprises steps of mixing initial coal raw material and water for receiving water-coal suspension; adding to said suspension agglomerating agent; separating carbon-containing component of coal raw material and ash in water-coal suspension; extracting carbon-containing component by flotation; in addition introducing frothing agent to water-coal suspension and separating carbon-containing component of coal raw material and ash by means of steam blown-in by separate streams for thinning ash-fraction component. Water-coal suspension includes 7.00 - 50.00 mass parts of water per 1 mass part of coal. Flow rate of steam is no more than 500 kg per ton of initial coal raw material. Flow rate values of agglomerating agent and frothing agent are in range 3 - 7 kg and 0.05 -0.15 kg respectively per 1 t of water-coal suspension.

EFFECT: reduced expenses for realization of method, less loss of yield of carbon-containing component, enhanced efficiency of removing ash from carbon-containing component.

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