Fluorescent X-ray Analysis of T. Fe, SiO2 and CaO in Iron Ores by Glass Bead Technique
1985 Volume 25 Issue 3 Pages 183-189
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1985 Volume 25 Issue 3 Pages 183-189
There have been problems on fluorescent X-ray analysis of iron ores by the glass bead technique. Of these, the influence of combined water on the analysis of total iron content and that of coexistent elements on the analysis of SiO2 and CaO contents have been studied. In this investigation sodium tetraborate was used as fusing flux.
The results were as follows.
(1) The influence of the combined water on T.Fe content determination was theoretically studied. The FeKα intensity was calculated in the Fe2O3-H2O loss sample system which was produced when water escaped from Fe2O3-H2O binary sample by, fusing and heating. Its intensity was higher than in Fe-O binary system sample on the standard calibration curve, at the same T.Fe content.
From the calculated change of the FeKα intensity, correction factors were derived. Goethite which had 10.1% CW was analysed more by about 0.5% T.Fe.
(3) The influence of coexistent impurities (elements), on SiO2 and
CaO content determination was theoretically studied. The SiKα and CaKα intensities were calculated in SiO2 Fe2O3-impurity and CaO-Fe2O3-impurity systems, respectively. Further, correction factors were derived when calibration curves were for SiO2-Fe2O3 or CaO-Fe2O3 system samples. The influence of coexistent elements on the SiKα and CaKα intensities was little.
(3) Analytical experiments for JSS standard samples showed that the theoretical results of (1) and (2) described above agreed well with experimental ones.
