Effects of firing temperature on the physical properties of a bauxite-based refractory castable


Goegtas C., Ünlü N. , ODABASI A., SEZER L., GUNER S., Göller G. , ...More

REFRACTORIES AND INDUSTRIAL CERAMICS, vol.53, no.1, pp.19-25, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 53 Issue: 1
  • Publication Date: 2012
  • Doi Number: 10.1007/s11148-012-9455-9
  • Title of Journal : REFRACTORIES AND INDUSTRIAL CERAMICS
  • Page Numbers: pp.19-25

Abstract

A self-flowing low-cement bauxite castable was prepared from 64 wt.% rotary Chinese bauxite and 10 wt.% Eczacibasi calcined alumina aggregates with additives of 5 wt.% Lafarge cement Secar 71, 8 wt.% Elkem microsilica 971U, and 0.05 wt.% dispersant Darvan 7S (D7S). Optimum self-leveling flowability was achieved using 5.6% water addition. As a function of the firing temperature, the physicomechanical and refractory properties of the self-flowing low-cement bauxite castable were characterized in terms of densification parameters such as apparent porosity (AP), bulk density (BD), water absorption (WA), and cold crushing strength (CCS). Phase analysis and microstructural-based evaluation were performed using x-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The present bauxite-based refractory castable heat treated at 1500A degrees C for 2 h exhibited the following properties: AP 13%, BD 2.93 g/cm(3), WA 4.4%, and CCS 1365 kg/cm(2).