Purification tank is a device used to extract useful materials after heating and other reactions inside the tank. Several materials are heated and soaked in the tank, and after the reaction is completed, the solid materials are intercepted in the tank through the bottom and side filters, and the liquid flows out into the next process. Sintered mesh often adopts perforated plate composite sintered plate mesh, which can be in the form of disc, cylinder, and conical filter element; The thickness of the sintered mesh is 2-6mm; the accuracy is mostly 150-250 microns.