Abstract
The comparative responses of three different clay deposits to iron removal by leaching, using oxalic acid have been studied. The sieve analysis of the clays was done to ensure uniform size distribution of grains. Different characterization techniques were thereafter employed on the raw clays, using X-ray Fluorescence Machine (ARL 8410), X-ray Diffraction Machine (Philips PW 3710 with PW 1752 graphite monocromator) and Scanning Electron Microscope (XL 30 ESEM/EDX) in order to ascertain the purity levels of the clays. The clays were then treated with oxalic acid of different concentrations (0.4, 0.8, 1.2, 1.6 and 2.0 mol/dm 3 ) at different temperatures (30, 50 and 70 °C), agitation speeds (120, 160, 200 and 240 rev/min) for periods of 30, 60, 90, 120 and 150 minutes to remove the impurities in them. XRF and Quantitative XRD were again repeated on the leached clay to know the extent of deferration of the clays. Filtrates of the chemical reactions were also taken at the different combinations of treatment parameters and analyzed, using the Atomic Absorption Spectrometer (AAS) to further ascertain the quantity of iron removed. The exercise revealed that: the iron contents reduced by 53.4, 80.61 and 48.27 % in Ifon, Ipetumodu and Iselin clays respectively. Keyword: Characterization,defferation, Filtrates,Leaching andPurity.
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