Pressure spray-dried polyaluminum chloride prepared by its indicators that the characteristics of pressure-spray-dried polyaluminum chloride is mainly determined by the working principle of the pressure atomizer, so that the drying system has its own characteristics. As the pressure spray-dried products are porous particles or hollow particles, the use of pressure spray-drying, and more to obtain a granular product for the purpose of the resulting granular product has excellent dust resistance and flow properties. Due to the larger contact area between product and water, wetting performance is better than powdered product, purifying water significantly faster than powdered product, and pressure spray-dried product has unique characteristics Well received by users. Spray granulation is the polyaluminium chloride is dried while atomized into tiny particles, this granule dosage form has good application performance. Polyaluminum chloride is a water-soluble substance, has good thermal stability and high solubility, in the drying process, the 40% -50% solid content of the polyaluminum chloride solution is introduced into the high-pressure pump, pressurized After entering the dryer atomizer, dispersed into tiny droplets, the droplets are dried to obtain a granular product, so that the drying and granulation at the same time completed. Pressure spray-drying products Features: 1) a large number of positively charged, stable multi-core aluminum complex, can effectively promote the flocculation, sizing. 2) The appearance of white, very low iron content, to meet the needs of manufacturing high-quality paper. 3) Polyaluminum chloride is a prehydrolyzate of aluminum chloride with a relatively low degree of hydrolysis and a smaller decrease in pulp pH than aluminum sulfate. 4) The use of aluminum chloride sizing, retention of the slurry, filter aid significantly improved. 5) In addition to the performance of the paper rupture length, the other indicators are improved to varying degrees.