Abstract
Water Leach Purification (WLP) residue is a Naturally Occurring Radioactive Material (NORM) that is composed of iron phosphate. The Malaysian government has classified WLP residue as a radioactive material since the thorium (Th) concentration surpassed the 1000 Bq/kg standard. The sample has been chemically and physically characterized by using X-ray fluorescence (XRF), inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) and particle size distribution analysis (PSD). Based on XRF result, the sample is made up of Fe2O3 (32 %) and P2O5 (20.8 %). The rare earth analysis using the ICP-MS technique revealed a total quantity of rare earth (ΣRE) of 88367 ppm with gadolinium (Gd) as the most abundant element. This data and information from the characterization data will be used in the next process which is REE extraction process.
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