Characterization and Value Enhancementof Some Nigerian Refractory Materialsfor Thermal Insulation
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 3
Abstract
The characterization and value addition to some Nigerian clay deposits; Ijapo Estate, Akure in Ondo State, Ire Ekiti in Ekiti State and Ilesha in Osun State have been carried out. The characterization was done by employing four different techniques on the clays in the as-mined states. The relative proportions of the constituent elements, the morphology and the phase identification of the clays were determined by using X-Ray Fluorescence (XRF), Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS), X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) analyses. The clays were prepared for the analyses by using the standard procedures and the results obtained were compared to confirm the consistency and reliability of the different methods employed. The results obtained revealed the various desirable (CaO, SiO2 and Al2O3) and deleterious (Fe2O3, K2O and MgO) compounds contained in the clays, in the various proportions. The clays were then purified hydrometallurgically at a predetermined condition; 1.2 mol/dm3 at 30 °C for 30 min and 200 rev/min in order to remove the iron content which had been identified for being responsible for lowering the melting temperatures of the clays. The purified clays were again characterized using the TEM and XRF analyses to confirm the extent of iron removal. Purified Ire Ekiti clay which responded best to purification was formed into samples containing 5 – 40 % alumina cement, 1-5 % woodflour, fired at varying temperatures of 900 °C, 1100 °C, 1300 °C and 1500 °C and tested for some important insulating properties such as permanent linear change, modulus of rupture and permeability. Purified Ire Ekiti clay containing 10 % alumina cement and 3% woodflour exhibited a good combination of the required properties of a good thermal insulating material.
Authors and Affiliations
D. O. Folorunso
Keywords
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- EP ID EP437935
- DOI 10.9790/1684-1503037986.
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