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- Title
Evaluation of the combined addition of aluminum lactate and calcium carbonate to alumina-based castables.
- Authors
Consonni, L. B.; da Luz, A. P.; Pandolfelli, V. C.
- Abstract
Calcium aluminate cement (CAC) can induce the development of high green mechanical strength to refractory castables in a short period of time (24 h). However, the production of this hydraulic binder is energy-intensive and releases a large content of carbon dioxide (CO2 ), which adds to global warming. Thus, aiming to develop an alternative binding system, this study investigated the combined addition of aluminum lactate (0.25-1.0 wt%) and calcium carbonate (3.2 wt%) to alumina castables. The prepared samples were analyzed using different experimental techniques, such as cold and hot modulus of rupture, hot elastic modulus, X-ray diffraction, and apparent porosity. According to the results, the lactate addition to the castables improved their green mechanical strength after drying at 110 °C/24 h (4.89 MPa) when compared to the one containing plain calcium carbonate (1.72 MPa). Furthermore, the carbonate-containing refractories presented cold and hot modulus of rupture similar or even superior to the castable containing cement in a wide temperature range (600-1500 °C).
- Subjects
CALCIUM carbonate; FLEXURAL strength; LACTATES; CALCIUM aluminate; ALUMINUM; CARBON dioxide; ALUMINA composites
- Publication
Ceramica, 2021, Vol 67, Issue 382, p196
- ISSN
0366-6913
- Publication type
Article
- DOI
10.1590/0366-69132021673823104