Analysis of key factors in the coagulation of metal salts based on the calculation of hydrolysis-precipitation distribution

Hydrolysis and precipitation are the key processes that determine coagulation performance of inorganic metal salts. The valence concentration salts, ligands, solution pH all influence performance. In order to get a full picture on pros cons various salts as coagulants, this paper conducted thermodynamic equilibrium calculations experiments analyze verify hydrolysis-precipitation areas speciation four (aluminum, iron, titanium, zirconium) in absence presence ligands. addition, contributions polynuclear hydrolysates hydrolysis ions were quantitatively described. Furthermore, underlying mechanisms effects common aquatic ligands discussed from perspective chemistry. above results provide theoretical basis for development application salt great significance understanding accurately.