Sintering of sepiolite-rich by-products for the manufacture of lightweight aggregatestechnological properties, thermal behavior and mineralogical changes

  1. J. M. Moreno-Maroto
  2. B. González-Corrochano
  3. J. Alonso-Azcárate
  4. C. Martínez-García
Revista:
Materiales de construcción

ISSN: 0465-2746

Año de publicación: 2021

Volumen: 71

Número: 341

Tipo: Artículo

DOI: 10.3989/MC.2021.05620 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Materiales de construcción

Resumen

A sepiolite mining by-product (SEP) has been studied as major component for lightweight aggregate (LWA) manufacture. Pellet bursting during firing was avoided by the addition of 2.5 wt% of thermoplastic waste (P) and 2.5 wt% P + 2.5 wt% carbon fiber residue (FC) in powder form. The mixtures were pelletized and then sintered at 1225º˚C for 4 minutes in a rotary kiln. Highly porous white LWAs with good mechanical strength were produced. A mineralogical study revealed the formation of amorphous phase ( > 50%) and minor proportions of enstatite, protoenstatite and diopside. Quartz was the only inherited mineral, appearing in the form of isolated phenocrysts within a general porphyritic texture. The result of this study suggests the promising use of sepiolite (whether or not in residue form) for the manufacture of high quality LWAs.

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Referencias bibliográficas

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