Accuracy in quantitative X-ray mineralogy - Part 2

XRD Lab Report - Aluminous goethite mixed-crystal in bauxite and iron ore

Aluminous goethite mixed-crystal, Lab Report

X-ray diffraction (XRD) is a method for determining the mineralogy of ore. The combination of fast detectors integrated in the XRD intruments with TOPAS quantitative phase analysis (QPA) allows standard-less analysis within minutes. The typical accuracy of QPA for well crystalline samples can be better 1 wt-%. This is proved by comparing the bulk chemical composition calculated from the concentration of the minerals and their stoichiometry to chemical analysis.

The report shows how variable Al/Fe stoichiometry can be handled in TOPAS. This helps the minerals industry to identify severe recovery losses in bauxite and iron ore processing.