Cr2O3, FeO, CaO, SiO2, Al2O3 and MgO, P2O5 determination in chromium ore

The test method specifies mass content determination of MgO, Al2O3, SiO2, P, Cr2O3, CaO, FeO in powder samples of Chromium ore by X-ray fluorescence method with “SPECTROSCAN MAKC-GV” spectrometer. Semi quantitative sulfur determination is also specified.

The analysis procedure includes two measurements of the same material sample prepared for analysis. The sample material is dried and grinded to the particle size of 50 micron.
The sample material is pressed into a pellet in a boron acid cup.
Boron acid cup is pressed out with a shaped punch being at least 3 mm deep. Sample material is put into the cup and pressed with a flat punch into a pellet. The pellet put into the sample holder and then into spectrometer. Analysis is carried out automatically according to the chosen program. The program can determine all elements (oxides) listed in the test method or some of those elements by choice.
Mass content determination of all elements is obtained from one sample.

Mass content range of the oxides specified in the test method is given in the table below.

Determined component Concentration range of the component, %
FeO 13,0 – 20,0
Cr2O3 21,0 – 44,0
CaO 0,009 – 0,06
S* 0,005 – 0,01
P 0,002– 0,004
SiO2 4,0– 22,0
Al2O3 9,0 – 18,0
MgO 14,0 – 28,0

* – semi quantitative determination.