Enrichment of a Nigerian Calcite ore for Hydroxyapatite production
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Date
2016-10-20
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Publisher
Australian Ceramic Society
Abstract
In this study, Hydroxyapatite (HAp) powders have been prepared from Calcite ore of Nigerian origin using diammonium hydrogen phosphate as the Phosphorus source via hydrothermal method. The HAp powders formed is used to determine the chemical structure and nature of HAp crystals at different reaction temperature and time of operation were characterized by X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) coupled with Energy Dispersive X-ray (EDS) and Fourier Transform Infra-red (FT-IR) techniques. Using a set of experimental conditions, different morphology, crystallinity and stoichiometric ratios were obtained. At optimal conditions (1M (NH4)2HPO4, 850C, 6 hours reaction time), a rectangular, rod-like and layered HAp crystal formed yielded Ca/P molar ratio of 1.66 which is close to the stoichiometric HAp ratio of 1.67 required for biomedical applications.
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Keywords
Hydroxyapatite, Calcite ore, Nigeria, Hydrothermal method, Ca/P stoichiometric ratio.