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Ionic Structure of AlCl3-FeCl3-FeCl2-HCl-H2O System in Acid Leaching Solution of Fly Ash
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Hanyang ZHANG1, 2, Xianwei HU1, 2, Hongguang KANG1, 2, Ruidong GUO1, 2, Murtadho MUHAMMAD1, 2, Fengyun YAN1, 2, Youjian YANG1, 2, Yaowu WANG1, 2, Zhaowen WANG1, 2
Hydrometallurgy of China | 2025, 44(4) : 440 - 447
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Hydrometallurgy of China | 2025, 44(4): 440-447
• Experiment Research •
Ionic Structure of AlCl3-FeCl3-FeCl2-HCl-H2O System in Acid Leaching Solution of Fly Ash
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Hanyang ZHANG1, 2, Xianwei HU1, 2, Hongguang KANG1, 2, Ruidong GUO1, 2, Murtadho MUHAMMAD1, 2, Fengyun YAN1, 2, Youjian YANG1, 2, Yaowu WANG1, 2, Zhaowen WANG1, 2
Affiliations
  • 1 School of Metallurgy,Northeastern University,Shenyang 110819,China
  • 2 Key Laboratory of Ecological Metallurgy of Multimetallic Mineral Resources,Ministry of Education,Shenyang 110819,China
Published: 2025-08-20 doi: 10.13355/j.cnki.sfyj.2025.04.002
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Preparation of alumina from fly ash by hydrochloric acid method is one of the processes with significant industrial application potential.Therefore,studying the ionic structure in acid leaching solution of fly ash is of great significance for iron removal process in the method.The ionic structure of the AlCl3-FeCl3-FeCl2-HCl-H2O system in hydrochloric acid leaching solution of fly ash at pH values of 1.0,1.5,and 2.0 was investigated by combining thermodynamic calculation,quantum chemical calculation,and Raman spectroscopy. The results show that at pH = 1.0,the main forms of Fe and Al complex ions in the system are [FeCl]+,[FeCl2]+ and [AlCl]2+;when the pH rises to 1.5 and 2.0,[FeCl]+,[FeCl2]+ and [AlCl]2+ transform into hydrolysis products such as [FeOH]+,[FeOH]2+ and [AlOH]2+ with hydroxyl ligands.The wave function analysis results indicate that at low pH,due to the high concentration of chloride ions,the chloride complexes are more stable.As the pH increases,the concentration of hydroxide ions increases,and the formation of high-coordination hydroxyl complexes becomes easier due to their higher metal-oxygen bond order and lower Gibbs free energy.

alumina  /  fly ash  /  complex ion  /  Raman spectroscopy  /  quantum chemical calculations
Hanyang ZHANG, Xianwei HU, Hongguang KANG, Ruidong GUO, Murtadho MUHAMMAD, Fengyun YAN, Youjian YANG, Yaowu WANG, Zhaowen WANG. Ionic Structure of AlCl3-FeCl3-FeCl2-HCl-H2O System in Acid Leaching Solution of Fly Ash[J]. Hydrometallurgy of China, 2025 , 44 (4) : 440 -447 . DOI: 10.13355/j.cnki.sfyj.2025.04.002
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Year 2025 volume 44 Issue 4
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Article Info
doi: 10.13355/j.cnki.sfyj.2025.04.002
  • Receive Date：2025-02-27
  • Online Date：2025-09-09
  • Published：2025-08-20
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  • Received：2025-02-27
Funding
Affiliations
    1 School of Metallurgy,Northeastern University,Shenyang 110819,China
    2 Key Laboratory of Ecological Metallurgy of Multimetallic Mineral Resources,Ministry of Education,Shenyang 110819,China
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https://castjournals.cast.org.cn/joweb/sfyj/EN/10.13355/j.cnki.sfyj.2025.04.002
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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