Device for improving purity of polyaluminum chloride

The invention discloses a device for improving purity of polyaluminum chloride. The device comprises a first tower body and a venturi device, wherein the venturi device comprises a shrinkage pipe, a throat pipe and a diffusion pipe; a sprayer is arranged in the throat pipe and connected with a liquid storage tank through a first liquid supply pipe; the shrinkage pipe is connected with an air outlet of a high-pressure fan; the diffusion pipe is connected with a liquid inlet of the first tower body; a spraying device is arranged at the inner top end of the first tower body and is connected with a liquid reagent pool through a second liquid supply pipe; a liquid inlet is located below the spraying device; a filtering device is arranged below the liquid inlet; a neutralizing pool is arranged below the filtering device; and the neutralizing pool is connected with an induced draft fan. According to the invention, polyaluminum chloride liquid is atomized and sprayed into the first tower body for a contact reaction w