Tomographic Imaging of Bauxite Grains Leached Using Hydrochloric Acid

X-ray computer tomography (XRT) is a three-dimensional, nondestructive, and thus reproducible examination method that allows for the investigation of internal and external structures of objects. Due to its characteristics, the XRT technique has increasingly established itself as an alternative exami...

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Bibliographic Details
Published in:Minerals (Basel) 2023-07, Vol.13 (7), p.884
Main Authors: Razavi, Anita, Stein, Alena, Quirmbach, Peter
Format: Article
Language:English
Subjects:
acid leaching
Aluminum
Aluminum compounds
Bauxite
Bayer process
Beneficiation
Chemical tests and reagents
Composition
Computed tomography
Design of experiments
Ferric oxide
Gibbsite
Grains
Hydrochloric acid
Hydrochloric acid leaching
Investigations
Iron
iron removal
Leaching
Mineral processing
Mineralogy
Minerals
Nondestructive testing
Porosity
Raw materials
Refractories
refractory grade
Tomography
X-ray computer tomography (XRT)
X-rays
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Summary:X-ray computer tomography (XRT) is a three-dimensional, nondestructive, and thus reproducible examination method that allows for the investigation of internal and external structures of objects. Due to its characteristics, the XRT technique has increasingly established itself as an alternative examination method and is also applied in the field of mineral processing. Within this work, XRT is used to investigate the influence of hydrochloric acid leaching of iron-rich bauxites on grain composition. Acid leaching is a promising method for the beneficiation of iron-rich bauxites for refractories. Many studies have already established that leaching with hydrochloric acid can reduce the Fe2O3 content in bauxites. However, apart from the influence of the leaching process on the composition of the bauxites, aspects such as the influence of the acid on the exact grain constitution or the porosity behavior have rarely been considered so far. To address these open questions, XRT analysis was used to examine and characterize various bauxites. By comparing identical grains before and after leaching, it was observed that in gibbsite bauxites the acid penetration is deeper, and the volume decreases significantly. In diasporic and boehmitic bauxites, clear leaching edges can be seen in which the iron content has been reduced.
ISSN:2075-163X
2075-163X
DOI:10.3390/min13070884