The main materials of polyaluminum chloride include calcium aluminate powder, hydrochloric acid, bauxite, and aluminum hydroxide. Different types of polyaluminum chloride may use different raw material ratios:
Low content polyaluminum chloride mainly uses calcium aluminate powder, hydrochloric acid, and bauxite.
High content polyaluminum chloride uses calcium aluminate powder, hydrochloric acid, bauxite, and aluminum hydroxide.
Spray drying polyaluminum chloride mainly uses aluminum hydroxide and hydrochloric acid.
Basic aluminum chloride mainly uses aluminum ash and hydrochloric acid.
In addition, the production of polyaluminum chloride may also use aluminum containing raw materials such as metallic aluminum, waste aluminum shavings, gray aluminum, aluminum trichloride, coal gangue, and fly ash.
Polyaluminum chloride (PAC) is an inorganic substance, an emerging water purification material and inorganic polymer coagulant, abbreviated as polyaluminum. It is a water-soluble inorganic polymer between AlCl3 and Al (OH) 3, with the chemical formula [Al2 (OH) nCl6-n] m, where m represents the degree of polymerization and n represents the degree of neutrality of the PAC product. N=1-5 is a highly charged polymeric cyclic chain with Keggin structure, which has a high degree of electroneutralization and bridging effect on colloids and particles in water, and can strongly remove micro toxic substances and heavy metal ions, with stable properties. The inspection method can be carried out according to the national standard GB 15892-2003. Due to the bridging effect of hydroxide ions and the polymerization effect of multivalent anions, the produced polyaluminum chloride is an inorganic polymer water treatment agent with relatively high molecular weight and charge.
The color is yellow or light yellow, dark brown, or dark gray resin like solid. This product has strong bridging adsorption performance, and during the hydrolysis process, physical and chemical processes such as coagulation, adsorption, and precipitation occur. The fundamental difference between polyaluminum chloride and traditional inorganic coagulants lies in the fact that traditional inorganic coagulants are low molecular crystalline salts, while polyaluminum chloride's structure is composed of a variety of multi-carboxyl complexes with fast flocculation and precipitation speed, wide pH range, no corrosiveness to pipeline equipment, obvious water purification effect, and can effectively remove heavy metal ions such as SS, COD, BOD, arsenic, mercury, etc. in water. This product is widely used in drinking water Industrial water and sewage treatment sector