The influence of bentonite on glass waste filled spent bleaching earth (SBE) composite

Nur Liyana, Mohd Daud (2014) The influence of bentonite on glass waste filled spent bleaching earth (SBE) composite. Project Report. UTeM. (Submitted)

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Abstract

The aim of this project is to investigate the influence of bentonite on spent bleaching earth (SBE) composite. The objectives of this project are to determine the suitable batch for glass composites and to evaluate the thermo-physical properties. Other than that, the objective of this project is to characterize the microstructure and the phases on the glass composites. Glass composites are used due to the combination of soda-lime glass (SLG) and borosilicate glass (BSG) powders with natural waste spent bleaching earth (SBE) and the specialty of it, is depending on the microstructure and its phases. The materials used in this project are SLG, BSG, SBE and bentonite which acting as the filler. The weight percent ratio for SLG and BSG have been fixed to 65% for the combinations of both glasses. The glass powders were supplied by Pusat Penyelidikan Mineral (PPM) in 75μm and were further sieved to 45μm in ceramic laboratory. The bentonite weight percent has been distinguished to 0wt%, 2wt%, 5wt%, 10wt%, 15wt% and 20wt%; sintered at 750°C and 850°C with the heating rate of 2°C/minute. The rest of the weight percent is SBE. The samples were pressed using the uniaxial dry pressing method. A few testing have been done like physical testing (optical observation, density and water absorption), mechanical testing (microhardness) and microstructure analysis (scanning electron microscope-SEM, energy dispersive X-ray spectroscopy-EDX and X-ray diffraction-XRD). The samples were rough after the sintering process. However, after reducing the bentonite weight percent ratio to 0 and 2wt%, the surface appearance has improved. 10% of bentonite have the highest hardness was 230kg/mm², which is very low and only can be used for simple soft application like indoor home decoration and jewelry. BSG is not suitable to be mixed in this composition because it caused the samples to be soft.

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