Evaluation of the combined addition of aluminum lactate and calcium carbonate to alumina-based castables

• Published in: Cerâmica
• Main Authors: L. B. Consonni, A. P. da Luz, V. C. Pandolfelli
• Format: Article
• Language: English
• Published: Associação Brasileira de Cerâmica 2021-05-01
• Subjects: alumina; refractory castables; sintering; calcium aluminate cement; calcium carbonate; aluminum lactate
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132021000200196&tlng=en

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).