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Sintering of sepiolite-rich by-products for the manufacture of lightweight aggregates: technological properties, thermal behavior and mineralogical changes ; Sinterización de subproductos ricos en sepiolita para la fabricación de áridos ligeros: propiedades tecnológicas, comportamiento térmico y cambios mineralógicos

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  • معلومة اضافية
    • بيانات النشر:
      Consejo Superior de Investigaciones Científicas
    • الموضوع:
      2021
    • Collection:
      Materiales de Construcción (E-Journal)
    • نبذة مختصرة :
      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. ; Se ha investigado la fabricación de áridos ligeros (LWAs) a partir de subproductos de la extracción de sepiolita (SEP). Durante la cocción, el estallido de los pellets se evitó mediante la adición de 2.5 wt% de residuo de plástico (P) y 2.5 wt% de P + 2.5 wt% de residuos de fibra de carbono (FC), ambos en forma de polvo. Las mezclas fueron peletizadas y sinterizadas en horno rotatorio a 1225˚ºC durante 4 minutos. Se obtuvieron LWAs blancos, altamente porosos y con buena resistencia mecánica. Un estudio mineralógico reveló la formación de fase amorfa ( > 50%) y proporciones menores de enstatita, protoenstatita y diópsido. El único mineral heredado fue el cuarzo, apareciendo en forma de fenocristales aislados dentro de una textura porfídica. Los resultados obtenidos sugieren que la sepiolita (ya sea en forma de residuo o no) puede tener un uso prometedor en la fabricación de LWAs de alta calidad.
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    • Relation:
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    • الرقم المعرف:
      10.3989/mc.2021.05620
    • الدخول الالكتروني :
      https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2308
      https://doi.org/10.3989/mc.2021.05620
    • Rights:
      Copyright (c) 2021 Consejo Superior de Investigaciones Científicas (CSIC) ; https://creativecommons.org/licenses/by/4.0
    • الرقم المعرف:
      edsbas.2B5A23C8