The production process is simple, in the 1980s is a commonly used technology at home and abroad. Due to the poor acid-solubility of aluminum hydroxide, the acid-dissolving process needs to be heated and pressurized to react at a suitable temperature and pressure, and after ripening, polyaluminum chloride products, aluminum hydroxide gel and lime are prepared. This method to produce less product impurities. However, the high cost of raw materials for the production of aluminum hydroxide, the resulting products are mostly used for drinking water. However, this method to produce the product of the basicity of the salt is not high, usually in the range of 30% to 50%, there have been many studies to improve the basicity of the country, such as dosing aluminum, calcium carbonate, sodium aluminate to aluminum hydroxide As the raw material of aluminum hydroxide and hydrochloric acid and water by a certain percentage