Polyaluminum chloride production problems often appear 1. Insoluble matter National standards for commercial aluminum chloride insoluble content made a clear provision. As domestic enterprises generally use minerals as raw materials, and minerals and other raw materials in general complex components, and need to go through crushing and other additives powder. And the finer the powder, the higher the alumina dissolution rate. However, the more insoluble impurities such as the more difficult to precipitate. Therefore, how to effectively reduce insoluble matter is an urgent problem to be solved in the production of polyaluminum chloride.2.Product Purity Problem Alumina content is an important index of polyaluminum chloride products. Generally believed that the higher the content, the higher the purity, indicating that the quality is better, in China's PAC industry, with the exception of a few companies can produce some products and special products. Most companies are based on bauxite, calcium aluminate and byproduct of a single low-quality production of PAC products, small-scale production. Low technical content, the active ingredient of the product is low in alumina content and impurities, while the high efficient and cheap composite aluminum salt and high purity aluminum chloride product rarely meet the market demand, especially the paper industry can not meet the high purity Polyaluminium chloride product needs. 3. Dosage There are many ways to prepare polyaluminum chloride, but to achieve a certain scale of industrial production is acid-soluble and alkali-soluble method, which due to production costs, the dissolution rate of alumina and other issues. The acid-soluble method is more practical than the alkali-soluble method, while the acid-soluble involves the concentration, dosage and other issues. The higher the concentration, the greater the rate of dissolution of alumina, but the more volatility will be, it is necessary to configure the concentration. The mass fraction is usually about 20%; dosage is small, alumina dissolution rate is low. The dosage is large. Polyaluminum chloride prepared is low in basicity and corrosive. Transport difficulties, it is necessary to reasonable dosage.