Do water purification industry people all know that there are three important indicators of polyaluminum chloride: aluminum content, base degree and water insoluble matter, these three indicators are directly related to the quality of polyaluminum chloride products, now mainly for how to control the standard of polyaluminum chloride water insoluble matter to make a summary.

The main determinant of how to control the water insoluble polyaluminum chloride to reach the corresponding standard is the quality of raw materials and the difference in production technology. The traditional production process of polyaluminum chloride is produced by roller drying method, which is also the mainstream production technology. There are two ways to control the index of water insoluble polyaluminum chloride by using the traditional production process: First through the plate and frame press filtration process to make its water insoluble matter to reach the corresponding index, followed by the current polyaluminum chloride manufacturers more commonly used method: natural precipitation, in order to control water insoluble matter through natural precipitation method, in addition to strict control of the raw material, precipitation time is also very important, generally to precipitation 3-5 days to reach the standard.

In addition to the traditional production process, let's take a look at the more advanced production process spray drying method. The quality of polyaluminum chloride produced by this equipment process is very good, and the water insoluble content is also very low and the corresponding standard. However, due to the high investment cost, it has not been widely promoted and used in the market. In addition to the production process to control the water insoluble index, through the raw materials can also be controlled, the traditional raw materials of polyaluminum chloride are: aluminum hydroxide powder, calcium aluminate powder, bauxite, and hydrochloric acid. The use of aluminum hydroxide powder production of polyaluminum chloride can greatly reduce the water insoluble polyaluminum chloride, and the use of calcium aluminate powder and bauxite production of goods if the production process control is not good, water insoluble content is likely to exceed the standard.

Whether drinking water treatment or sewage treatment, the requirements for water insoluble matter or very strict, water insoluble matter seriously exceed the standard, the direct drawback is easy to sewage treatment pump blockage, resulting in equipment paralysis.