Study on Equilibrium of Hydroxyl Complex Ions in Al³⁺-H₂O System

Abstract:

Diagrams for the concentration of complex ions pc-pH, the ratio of aluminum hydroxyl complex ions α_n-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 α_n-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 pP_S-pH indicates that the pP_S 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.

• Periodical: Advanced Materials Research (Volume 997)
• Pages: 341-345
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.997.341
• Online since: August 2014
• Authors: Yi Wen Ma, Ying Hou, Wan Zhong Yin*, Ju Jian Zhu, Ya Zhuo Ding, Jin Yao, Yu Lian Wang
• Keywords: Al³⁺-H₂O System, Aluminum Wastewater, Coordination Chemistry, Neutralization Method

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