According to physics, the nature of different media, the capacity, the purpose of selecting the appropriate stirrer stirring, to promote the chemical reaction rate, improve production efficiency can play a significant role. Type agitating porridge-like material generally used in mixing, stirring rotation number to 60-130r / min may be considered appropriate paddle stirrer deformation, its structure is relatively strong, a large quantity of materials agitated. If under such a stirrer and the bottom of the reactor head shape similar shape, often referred to as anchor agitator. Box-type agitator larger diameter, inside diameter and generally reactor 2/3 ~ 9 / 10,50 ~ 70r / min. Box-type agitator and vessel wall gap is small, is conducive to the heat transfer process, while rapidly rotating, agitator blades driven by the still liquid layer from the reactor walls brought down; slowly rotating, there scraper blender can produce good thermal conductivity. Such an agitator used in heat, stirring crystallization operation and high-viscosity liquids, high concentration slurry and slurry settling.