TY  - JOUR
A1  - Razavi, Anita
A1  - Stein, Alena
A1  - Quirmbach, Peter
T1  - Tomographic Imaging of Bauxite Grains Leached Using Hydrochloric Acid
T2  - Minerals
N2  - 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.
KW  - X-ray computer tomography (XRT)
KW  - bauxite
KW  - refractory grade
KW  - iron removal
KW  - acid leaching
Y1  - 2023
UR  - https://kola.opus.hbz-nrw.de/frontdoor/index/index/docId/2427
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:kob7-24271
SP  - 1
EP  - 15
ER  -