BS 6870-3:1989

Foreword
Committees responsible
Method
1 Scope
2 Principle
3 Preparation of the analysis sample
4 Reagents
5 Apparatus
6 Preparation of beads
7 Presentation of beads
8 XRF spectrometer
9 Ratio standard beads
10 Calibration standard beads
11 Alpha correction standard beads
12 Calibration
13 Line interference and background effects
14 Alpha corrections
15 Analysis
16 Correction for tungsten carbide contamination and
    loss on ignition
17 Reporting of results
18 Test report
Appendices
A Tungsten carbide corrections with cobalt or nickel
    binder
B Monitoring of background and sensitivity
C Typical alpha corrections for rhodium and window
    X-ray tubes
D Computation of third order equations
Tables
1 Ranges of content on the ignited basis
2 Maximum allowable detection limits
3 Composition of ratio standard beads
4 Silicon dioxide/aluminium oxide binaries
5 Minor constituents and silicon dioxide
6 Iron (III) oxide and minor constituents
7 Rhodium end window tube empirical alpha corrections
    (x 10 to the power 5)
Figure
1 Example of a fusion mould

Method using fused cast bead technique. General requirements for instrumentation and full details of calibration and determination of correction factors.

This Part of BS 6870 describes a method for the analysis of aluminium ores using wavelength dispersive X-ray fluorescence. It is applicable to materials containing not more than 40 % of iron (III) oxide (Fe2O3) on the ignited basis. The ranges of content of constituents covered by this standard are given in Table 1. Table 1 – Ranges of content on the ignited basis Oxide Range % (m/m) Silicon dioxide (SiO2) 0.5 to 30 Aluminium oxide (Al2O3) 20 to 100 Iron (III) oxide (Fe2O3) 0.05 to 40 Titanium oxide (TiO2) 0.05 to 8 Calcium oxide (CaO) 0.05 to 2 Magnesium oxide (MgO) 0.05 to 2 Phosphorus pentoxide (P2O5) 0.05 to 5 Gallium oxide (Ga2O3) 0.005 to 0.2 NOTE Other elements may be added as necessary, and in particular tungsten oxide (WO3) [0.02 % to 5 % (m/m)] where a material containing tungsten carbide is used for sample preparation. NOTE The titles of the publications referred to in this standard are listed on the inside back cover.