Abstract
Diagrams for the concentration of complex ions pc-pH, the ratio of aluminum hydroxyl complex ions αn-pH, and conditional solubility product of their hydrates to pH in their system were drawn based on the thermodynamic equilibrium principle of complex chemistry. The relationship between the equilibrium concentration of total aluminum ions and pH was shown in Al3+-H2O system, when dissolution of Al (OH)3 is in equilibrium. The solubility of Al (OH)3 is the least when pH=5.69~8.00. The diagram for αn-pH shows that each hydroxyl complex ion existed in the system is dependent upon an optimized pH value. The diagram for the conditional solubility product pPS-pH indicates that the pPS reaches minimum when pH=5.0~8.0. The results can provide a theoretical basis for the technology on the flotation influenced by aluminum ions and removal of aluminum ions from the wastewater by neutralized method.
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