Totally-closed alkali liquor recovery microfilter

A totally-closed type alkali liquor recovery microfilter comprises a rotary drum arranged in an upper protective cover, the two ends of the rotary drum are supported outside the upper protective cover and are supported through a small supporting wheel and a positioning supporting wheel on a machine base respectively, an alkali liquor inlet in one end of the rotary drum is provided with a liquor distribution groove, a large gear is arranged at the alkali liquor inlet, and a small gear is arranged at the other end of the rotary drum. The bottom of the upper protective cover is fixed to the machine base, a conical connector with a horn-shaped opening is fixed to the end, in the receiving hopper, of the rotary drum, and an annular outer water throwing disc is fixed to the position, close to the conical connector, of the outer side wall of the rotary drum. And an annular outer water baffle is fixed on the inner side wall of the material receiving hopper between the outer water throwing disc and the conical interfa