Production process for concentrating water coal slurry by gasification in coal chemical industry and used device

The invention discloses a production process for concentrating water coal slurry by gasification in coal chemical industry and a used device. The production process comprises the following steps of: (1) putting steam coal with the particle size being less than or equal to 20mm into a plurality of rod grinder for grinding to obtain coarse water coal slurry, then entering rod-grinder buffering tanksafter carrying out primary sieving, and pumping to a slurry accumulating groove; (2) drawing 10%-20% of the coarse water coal slurry entering the slurry accumulating groove, conveying the drawn coarse water coal slurry and the steam coal with the particle size being less than or equal to 6mm into a ball grinder for grinding to obtain 325-mesh fine water coal slurry with the passing rate being 75%, then leading the fine water coal slurry to enter a ball-grinder buffering tank, and pumping to a mixing stirrer; pumping the other coarse water coal slurry entering the slurry accumulating groove tothe mixing stirrer; (3) m