Thermodynamics of the decomposition of aluminum chloride hexahydrate to prepare alumina

Описание

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.1016/j.jmrt.2021.11.099

Ключевые слова: alumina, aluminum chloride hexahydrate, coal fly ash, decomposition atmosphere

Аннотация: High-alumina coal fly ash is a high-quality alternative to produce alumina as one of the raw materials for the production of aluminum. The extraction of alumina from coal fly ash with hydrochloric acid is a common treatment method. With this method, coal fly ash is leached with hydrochloric acid to obtain an aluminum chloride solutПоказать полностьюion which is then separated, purified, and concentrated to form aluminum chloride hexahydrate. Alumina is then prepared by calcining aluminum chloride hexahydrate. The decomposition processes of aluminum chloride hexahydrate significantly affect the physical and chemical properties of the alumina product. In this paper, the effects of temperature and decomposition atmosphere on the thermal decomposition reaction were studied by thermodynamic analysis. The crystal phase transformation and microscopic morphology of the decomposition products were studied by combining chemical analysis, XRD, and SEM techniques. The results showed that the chlorine content of the decomposition products obtained in the water vapor atmosphere was significantly lower than that obtained in the argon atmosphere. © 2021 The Author(s)

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Издание

Журнал: Journal of Materials Research and Technology

Выпуск журнала: Vol. 15

Номера страниц: 6640-6646

ISSN журнала: 22387854

Издатель: Elsevier Editora Ltda

Персоны

  • Yang Youjian (Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimetall Minerals, Shenyang 110819, Peoples R China)
  • Wang Ning (Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimetall Minerals, Shenyang 110819, Peoples R China)
  • Pang Xiaojuan (Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimetall Minerals, Shenyang 110819, Peoples R China)
  • Yasinskiy Andrey (Siberian Fed Univ, Lab Phys & Chem Met Proc & Mat, Krasnoyarsk 660025, Russia; Rhein Westfal TH Aachen, Inst Proc Met & Met Recycling, IME, D-52056 Aachen, Germany)
  • Tan Yajie (Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimetall Minerals, Shenyang 110819, Peoples R China)
  • Yu Jiangyu (Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimetall Minerals, Shenyang 110819, Peoples R China)
  • Wang Zhaowen (Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimetall Minerals, Shenyang 110819, Peoples R China)
  • Shi Zhongning (Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China)

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