What indexes determine the quality of polyaluminium chloride

Polyaluminium chloride is an inorganic polymer coagulant. It is an inorganic polymer water treatment agent with large molecular weight and high charge produced due to the bridging effect of hydroxyl ions and the polymerization of multivalent anions. The main indicators of polyaluminium chloride include alumina content, salinity, water insoluble matter, etc. these indicators are directly related to the quality of polyaluminium chloride.

It is generally impossible for laymen to use chemical methods to detect the specific values of polyaluminium chloride content, alkalinity, water insoluble matter, etc., but what simple way to know the composition of polyaluminium chloride? That is the appearance. The appearance properties of polyaluminium chloride are related to the basicity, manufacturing method, impurity composition and alumina content. Pure liquid polyaluminium chloride is a light yellow transparent liquid when the basicity is in the range of 40% ~ 60%, and gradually becomes a colorless transparent liquid when it is more than 60%. When the basicity of solid polyaluminium chloride is less than 30%, it is a lens, when it is in the range of 30% ~ 60%, it is a colloid, and when it is more than 60%, it gradually becomes vitreous or resin. The color of solid polyaluminium chloride made of bauxite or clay ore is yellow or brown, and this kind of polyaluminum chloride is more in the market. It is necessary to elaborate. First, the smaller the base value, the larger the volume of the same kilogram of polyaluminum chloride. In addition, the alumina content and water insoluble matter complement each other. The high alumina content and water insoluble matter are low, The color is yellow (the one with high iron content is golden yellow, and the one with low iron content is light yellow), the content of alumina is low, the water insoluble matter is high, and the color is dark. Generally, this law is followed.