Products [Chinese name] spray drying PAC (referred to as poly aluminum) [technical standards] product quality in line with the characteristics of pressure spray drying characteristics of the national standard spray drying PAC primarily by pressure atomizer The working principle of the decision, so that the drying system has its own characteristics. As the pressure spray drying the resulting product is a hollow porous particles or particulate form, using pressure spray dry, granular product for the purpose, resulting granular product with excellent dust and flow properties. Since a larger area of ??contact between the product and water, the better wetting properties than the powdered products, significantly higher than the velocity of water purified powdered products, the pressure of spray-dried product has a unique characteristic, so praised by users. Spray granulation is dried poly aluminum chloride while being atomized into tiny particles, the dosage form has a good application properties. Poly aluminum chloride is soluble substance having a high thermal stability and good solubility in the drying process, the 40% -50% solids solution of poly-aluminum chloride introduced into the high-pressure pump by pressing After entering the dryer atomizer atomized into tiny droplets dispersed droplet granular product was obtained after drying, the drying and granulation simultaneously. Spray drying PAC PAC product advantages contrast with the general paper sizing products as paper sizing agent is characterized by high purity aluminum chloride. By a series of different degree of polymerization of inorganic polymers composed mainly composed of highly charged polymeric chain polymeric aluminum ions. When a paper sizing PAC precipitant, water produced in the hydrolysis of hydrated ferric ion, and after a series of reactions in the negative charge of the fibers and filler particles, and at the isoelectric point precipitate began to gather at the adhered cellulose plays an important role in the sizing process, the sizing agent is a novel paper sizing precipitant. The early 1980s, some European and American countries have started the PAC for the paper. Our researchers are actively studying the PAC in neutral rosin sizing techniques. Although aluminum sulphate is widely used in paper sizing precipitation, however, in recent years, with the development of neutral sizing technology, some negative effects during use of aluminum sulfate is becoming increasingly prominent, such as corrosion of the equipment, paper strength decreased, anti-aging performance is poor, limiting inexpensive high quality calcium carbonate filler used and so on. Compared to aluminum sulfate, PAC has the following characteristics: 1) a large number of positively charged, form stable polynuclear hydroxy aluminum complexes, can effectively promote flocculation, sizing. 2) the appearance of white, low iron content, to meet the needs of manufacturing high-quality paper. 3) is a pre-hydrolyzate PAC aluminum chloride, a relatively low degree of hydrolysis, the pH of the pulp to decrease smaller than that of aluminum sulfate. 4) is only suitable for acidic aluminum sulfate sizing, sizing and PAC can in acidic and neutral environments, corrosion of the system significantly weakened, Whitewater handling easier. 5) Use PAC sizing, slurry retention, drainage function improved significantly. 6) In addition to breaking length of paper performance, other indicators have improved to varying degrees. The main technical indicators PAC spray of white spray drying PAC is a white powder with high purity aluminum hydroxide hydrochloric acid by spray drying processing of milk or milky-like fine powder, easily exposed in the air melting, color pure, clear water of the water after the product transparent, without any color, while the ordinary aqueous poly aluminum color yellow or brown. White uses a PAC products, mainly for drinking water, industrial water, oil field injection water, cooling water and a variety of water (such as municipal sewage, oily wastewater, wastewater dyeing, papermaking wastewater, sewage bleaching mills etc.) process. 2, paper sizing precipitating agent, clarifying sugar bleaching agent. 3, for a number of areas tanning, pharmaceutical, cosmetics and precision casting. In recent years, white aluminum chloride, aluminum sulfate was substituted as the paper industry the use of neutral sizing agent to precipitate the solid product is formulated as a 10% content of the liquid products to be applied in sizing 1.5-3.0 slurry % of the liquid product, and sufficiently stirred to be mixed with the slurry. Like its usage with aluminum sulfate, aluminum sulfate dosage is only one-third, according to absolutely dry paper calculated the amount of 2% to 3%. Spray PAC and protective packaging products inside and outside the double packaging, with plastic bags, bags for external use. 25 kg per package. Spray PAC precautions, this product is acidic products, the absolute prohibition of same alkaline substances (such as bleach, lime, etc.) along with storage, otherwise the product will fail. 2, the solid product is easy to absorb moisture, should be placed in a dry place for storage. 3, in the bags in good condition, shelf life of one year