This Standard sets out two methods for the determination ofmineral matter in coal, and a method for determination of water ofconstitution.
The methods for mineral matter determination are as follows:
(a) Radio-frequency oxygen plasma oxidation.
(b) Air oxidation (370Â°C).
Both methods are known as low-temperature oxidation techniques.The radio-frequency method yields a residue that containsessentially the original unchanged mineral matter of the coal, andis suitable for semi-quantitative analysis of the mineral mattercomposition. Predictable alteration of some minerals occurs in theair oxidation process, and appropriate empirical corrections aremade.
1 For the applicability of this Standard to lower rank coals,reference should be made to Appendix A.
2 It is advisable to use the radio-frequency oxygen plasmaoxidation method for coals of high ash, due to significantirreversible loss of water of constitution in the air oxidationmethod.
SAA AS 1038.22
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