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

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

doi:10.3969/j.issn.1000-6532.2023.05.011

Kuangchan zonghe liyong (Oct 2023)

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

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

Affiliations

Shuo Dong: Instrumental Analysis Center, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia, China
Bangwen Zhang: Instrumental Analysis Center, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia, China
Ruichao Zhao: Instrumental Analysis Center, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia, China
Chaoke Bulin: Materials and Metallurgy School, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia, China
Fang Liu: Inner Mongolia Jincai Mining Co., Ltd, Hohhot, Inner Mongolia, China

DOI: https://doi.org/10.3969/j.issn.1000-6532.2023.05.011
Journal volume & issue: Vol. 44, no. 5
pp. 58 – 62

Abstract

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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.

Published in Kuangchan zonghe liyong

ISSN: 1000-6532 (Print)
Publisher: Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.kczhly.com/indexen.htm

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