Influence of Grog Size on the Performance of NSU Clay-Based Dense Refractory Bricks

Adindu C. Iyasara^1, , Ekenyem C. Stan², Okafor Geoffrey³, Moses Joseph², Nwabuna Nwokedi Patrick⁴ and Nnachi Benjamin³

¹Department of Ceramic and Glass Technology, Akanu Ibiam Federal Polytechnic, Unwana, Nigeria

²Department of Metallurgical Engineering Technology, Akanu Ibiam Federal Polytechnic, Unwana, Nigeria

³Department of Mechanical Engineering Technology, Akanu Ibiam Federal Polytechnic, Unwana, Nigeria

⁴Department of Architecture, Akanu Ibiam Federal Polytechnic, Unwana, Nigeria

Cite this paper:
Adindu C. Iyasara, Ekenyem C. Stan, Okafor Geoffrey, Moses Joseph, Nwabuna Nwokedi Patrick and Nnachi Benjamin. Influence of Grog Size on the Performance of NSU Clay-Based Dense Refractory Bricks. American Journal of Materials Science and Engineering. 2016; 4(1):7-12. doi: 10.12691/ajmse-4-1-2

Abstract

The suitability of using local kaolin (Nsu clay) and Nsu clay grog to enhance efficiency (reduce shrinkage, improve abrasion and reduce porosity) in the production of dense refractory bricks was studied. The chemical analysis, crystal structure examination and microstructural analysis were determined using the atomic absorption spectrophotometer (AAS), x-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The physical properties in terms of refractoriness, linear shrinkage, bulk density and apparent porosity as well as mechanical properties in terms of cold crushing strength (CCS) were carried out using American Society for Testing and Material (ASTM) stipulated standard methods. Test specimens (sample A = 20, sample B = 30 and sample C = 40 % grog sizes) were prepared and tested using the standard methods. The overall chemical and structural analysis of the raw Nsu clay showed that it is rich in SiO₂ (59.20 wt. %) and Al₂O₃ (26.30 wt. %) with trace amounts of MgO, Fe₂O₃ and K₂O, hence an alumino-silicate clay. The refractory properties measured showed acceptable and efficient results. Maximum apparent porosity (20.22 %) and CCS (61.77 MPa) were obtained at sample B = 30 % grog size.

Keywords:
Kaolin Grog Dense refractory X-ray diffraction Alumino-silicate

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