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The features of pressure type spray dried method are determined by the operating principle of pressure type atomizer. The output product after pressure type spray dried process is porous fine particle or hollow fine particle, which shows the features of superior dustproof and flowing property. Owing to its bigger contact area between itself and surrounding water than other powder products, it shows better wet ability and quicker water purifying speed. Spray granulation is to dry poly-aluminum chloride and atomize to be minute particle simultaneously. Poly-aluminum chloride is water soluble substance and shows features of good thermal stability and high solubility. Poly-aluminum chloride solution with 40-50% solid content on drying is introduced to high pressure pump, atomized in atomizer of dryer to be minute fog drop which is the dried to be granular products. Dehydration and granulation are made simultaneously in this process.