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The origin of polyaluminum chloride

Polyaluminum chloride (PAC) is an inorganic polymer coagulant, also known as polyaluminum chloride or polyaluminum, which developed from traditional aluminum salts in the late 1960s. Its origin and development process are roughly as follows:

In the late 1960s, Japan proposed the preparation process of using industrial aluminum hydroxide to produce active aluminum hydroxide, which was then dissolved in hydrochloric acid. This was an important turning point in the production of polyaluminum chloride. Subsequently, in the 1980s, the domestic production of polyaluminum chloride began to widely adopt the pressurized and heated reaction process of aluminum hydroxide and hydrochloric acid. The alkalinity of polyaluminum chloride produced by this process is generally between 40% and 50%, with low heavy metal content, and can be used for drinking water treatment.

In addition, the production raw materials for polyaluminum chloride are also different. Initially, polyaluminum chloride was mainly processed from aluminum ash, which was sourced from the scraps of electrolytic aluminum. Due to the gray black appearance of polyaluminum chloride produced from this raw material, which is significantly different from the yellow or white color of polyaluminum chloride produced from aluminum hydroxide, the former product is commonly referred to as alkaline aluminum chloride. With the development of technology and deeper understanding, it has been discovered that polyaluminum chloride is actually a transitional state between aluminum trichloride and aluminum hydroxide, which can also be referred to as "basic aluminum chloride" or "hydroxyl containing aluminum chloride". Later, this substance was assigned to the field of inorganic polymers and uniformly referred to as "polyaluminum chloride", that is, "inorganic polymer hydroxy aluminum chloride polymer".

Overall, the origin of polyaluminum chloride is a process of technological progress and deepening understanding. The continuous improvement and optimization of its production process and raw materials have made this inorganic polymer flocculant widely used in water and wastewater treatment and other fields.

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