Thermodynamics Analysis on Hydrochloric Acid Leaching for Waste Ceria-Based Rare Earth Polishing Powder

Dong Shuo; Zhang Bangwen; Zhao Ruichao; Bulin Chaoke; Liu Fang

doi:10.3969/j.issn.1000-6532.2023.05.011

2023 No. 5

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Article navigation > Multipurpose Utilization of Mineral Resources > 2023 > 44(5): 58-62, 69

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Dong Shuo, Zhang Bangwen, Zhao Ruichao, Bulin Chaoke, Liu Fang. Thermodynamics Analysis on Hydrochloric Acid Leaching for Waste Ceria-Based Rare Earth Polishing Powder[J]. Multipurpose Utilization of Mineral Resources, 2023, 44(5): 58-62, 69. doi: 10.3969/j.issn.1000-6532.2023.05.011

Citation:

Dong Shuo, Zhang Bangwen, Zhao Ruichao, Bulin Chaoke, Liu Fang. Thermodynamics Analysis on Hydrochloric Acid Leaching for Waste Ceria-Based Rare Earth Polishing Powder[J]. Multipurpose Utilization of Mineral Resources, 2023, 44(5): 58-62, 69. doi: 10.3969/j.issn.1000-6532.2023.05.011

Thermodynamics Analysis on Hydrochloric Acid Leaching for Waste Ceria-Based Rare Earth Polishing Powder

1.
Instrumental Analysis Center, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia, China
2.
Materials and Metallurgy School, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia, China
3.
Inner Mongolia Jincai Mining Co., Ltd, Hohhot, Inner Mongolia, China

More Information

Corresponding author: Zhao Ruichao, wszrc7@126.com

Received Date: 07 April 2022

Publish Date: 25 October 2023

Abstract

Abstract

This is an essay in the field of metallurgical engineering. Thermodynamics of the reaction, hydrochloric acid leaching for waste ceria-based rare earth polishing powder, was studied in this work.The influences on the leaching rate of the waste polishing powder was respectively considered including hydrochloric acid concentration and leaching temperature in the experiment. The result of the Gibbs free energy of leaching reaction and leaching experiment showed, thermodynamics theoretical analysis was consistent with experiment date for CeO₂ and La₂O₃. CeO₂ could not be immersed in dissolution, and La₂O₃ was easy to get leached. However, the experiment result was quite opposite of theoretical thermodynamics calculation for Al₂O₃. The Gibbs free energy of leaching reaction for Al₂O₃ were always a positive value, and Al₂O₃ from the waste polishing powder couldn’t be immersed by hydrochloric acid, but experiment result indicated that the Al₂O₃ leaching rate can be stabilized above 91%. Amorphous forms Al₂O₃ had high reactive activity in the waste, but the thermodynamic parameter of inert Al₂O₃ crystal structure (corundum) was adopted in the Gibbs free energy calculation.
- Metallurgical engineering /
- Waste ceria-based rare earth polishing powder /
- Hydrochloric acid leaching /
- Thermodynamics of the reaction /
- Leaching rate

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References

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