Treatment device for coal slurry preparation tail gas

The utility model relates to a coal slurry preparation tail gas treatment device. The treatment device comprises at least one coal slurry preparation unit; a tail gas outlet of the coal slurry preparation unit is connected with a tail gas induced draft fan through a cooling dust removal unit, an acid washing tower and an alkaline washing tower in sequence; the cooling and dedusting unit comprises a venturi spray tower, a tail gas inlet of the venturi spray tower is connected with a tail gas outlet of the coal slurry preparation unit, a tail gas outlet of the venturi spray tower is connected with a tail gas inlet in the lower part of a cyclone separator, a cyclone separation demister is arranged at the middle upper part of the cyclone separator, and a tail gas outlet is formed in the top of the cyclone separator; volatile matters such as ammonia, methanol, methylamine and hydrogen sulfide contained in the tail gas generated in the coal slurry preparation process, odor and granular dust in the waste gas can be