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HomeAgriculture & FoodFertilizersAnalytical ServicesParticulate TestingClay Identification & Analysis
XRD (X-ray diffraction) provides rapid identification of minerals and reveals detailed information about the chemical composition and crystallographic structure of your samples. It is useful for identifying fine grained phases which are difficult to identify optically, by Scanning Electron Microscope/Energy Dispersive Spectrometer (SEM/EDS) or Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN®).
XRD is the preferred method for clay speciation, particularly swelling clays such as smectites. Clay mineralogy can provide a critical indicator of the presence of mineralization. This technology has a number of important applications for clays:
Clay minerals identified by X-ray diffraction analysis will be reported and grouped into major (>30%), moderate (10-30%), minor (2-10%) and trace (<2%) amounts. Due to the poor crystallinity of clay minerals, the samples are separated using a centrifuge followed by a series of procedures (e.g. the addition of ethylene glycol and high temperature heating). This preparation is necessary to differentiate between clay species.
Clay minerals can be reported and grouped into major, moderate, minor and trace amounts. Mineral abundances for the bulk sample (in weight %) generated by RIR (or Rietveld) XRD analysis will be reconciled with a whole rock analysis plus the analysis of any other major elements contained in the sample and reported. Whole rock analysis by X-ray fluorescence spectroscopy includes SiO2, Al2O3, Na2O, K2O, CaO, MgO, Fe2O3, Cr2O3, MnO, TiO2, P2O5, V2O5 and LOI.
SGS is the industry leader in High Definition Mineralogy for the global minerals industry and other market sectors that need detailed material, product or residue characterizations. For quantitative mineralogical analysis and determination of clay technological properties, trust SGS.