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Open AccessArticle

Synthesis of Calcium Aluminates from Non-Saline Aluminum Dross

1
Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda. Gregorio del Amo, 8, 28040 Madrid, Spain
2
ARZYZ, S.A. of C.V Avda, Don Mario Sergio Ramírez Morquecho 794, Pesquería River, 66632 Cd Apodaca, N.L., Mexico
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1837; https://doi.org/10.3390/ma12111837
Received: 14 May 2019 / Revised: 3 June 2019 / Accepted: 5 June 2019 / Published: 6 June 2019
(This article belongs to the Section Materials Chemistry)
The present work examines the synthesis of tricalcium aluminate (for use as a synthetic slag) from the non-saline dross produced in the manufacture of metallic aluminum in holding furnaces. Three types of input drosses were used with Al2O3 contents ranging from 58 to 82 wt %. Calcium aluminates were formed via the mechanical activation (reactive milling) of different mixtures of dross and calcium carbonate, sintering at 1300 °C. The variables affecting the process, especially the milling time and the Al2O3/CaO molar ratio, were studied. The final products were examined via X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The reactive milling time used was 5 h in a ball mill, for a ball/dross mass ratio of 6.5. For a molar relationship of 1:3 (Al2O3/CaO), sintered products with calcium aluminate contents of over 90% were obtained, in which tricalcium aluminate (C3A) was the majority compound (87%), followed by C12A7 (5%). View Full-Text
Keywords: aluminum; non-saline dross; tricalcium aluminate; calcium aluminates; reactive milling; sintering aluminum; non-saline dross; tricalcium aluminate; calcium aluminates; reactive milling; sintering
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MDPI and ACS Style

López, F.A.; Martín, M.I.; Alguacil, F.J.; Sergio Ramírez, M.; González, J.R. Synthesis of Calcium Aluminates from Non-Saline Aluminum Dross. Materials 2019, 12, 1837.

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