The invention provides a closed pit
coal mine acid old
kiln water outflow point pretreatment device, and belongs to the technical field of
solid-liquid separation, the closed pit
coal mine acid old
kiln water outflow point pretreatment device comprises a purification unit, a first telescopic piece and an
impurity conveying unit, the purification unit comprises a frame body, a screen drum, a water plugging sleeve, a
medicine injection
nozzle and a
medicine dispensing tank, the screen drum is connected to the frame body, and a first valve is installed at an outlet in the bottom of the screen drum; the water plugging sleeve is arranged on the periphery of the screen drum, the water plugging sleeve is in sliding connection with the screen drum, the
medicine injection
nozzle is arranged in the screen drum, and the medicine injection
nozzle is communicated with the medicine dispensing tank; the first telescopic piece stretches out and draws back along the axis of the screen drum, the fixed end of the first telescopic piece is fixedly connected with the frame body, and the telescopic end of the first telescopic piece is fixedly connected with the water plugging sleeve. The
impurity conveying unit comprises a first
impurity guiding
pipe and a first transferring
assembly, an opening of the first impurity guiding
pipe is in
butt joint with the outlet, and the first transferring
assembly is connected into the screen drum and used for conveying impurities in the screen drum into the first impurity guiding
pipe. The treatment efficiency of the old
kiln water is improved.