PD ISO/TR 18230:2015 pdf free.Iron ores一Determination of loss on ignition一Nonoxidised ores.
This Technical Report describes a gravimetric method for the determination of the loss in mass of non- oxidized iron ores, when ignited at 1 000 °C.
This method is applicable to a concentration range of a mass fraction of—3,0 % to 7,0% loss on ignition in natural iron ores, iron ore concentrates and agglomerates, and sinters.
The method is not applicable to the following:
a) processed ores containing metallic iron (direct reduced iron);
b) natural or processed ores in which the sulfur content is higher than a mass fraction of 0,2 %; c) internationally traded ores with combined water greater than 2,5 %.
NOTE I Loss on ignition can be used as an estimate ol combined water.
NOTE 2 This method is intended for in-house use and is not intended for referee purposes.
2 Principle
A test portion is heated in a muffle furnace at 1 000 °C for 60 mm and cooled in a desiccator. The decreased mass of the test portion is then measured.
3 Reagents
During the analysis, use only reagents of recognized analytical grade.
3.1 Silica gel, dried at 105 °C for 4 h.
4 Apparatus
Ordinary laboratory apparatus and the following:
4.1 Silica, porcelain or platinum crucibles, 15 ml to 25 ml capacity, with lids.
The crucibles should be pre-conditioned in the muffle furnace at 1 000 °C for 60 mm. Crucibles and lids should be stored in the desiccator 4A) prior to use.
If platinum crucibles used for LOl analysis are to be used for flux fusions, platinum ware should be thoroughly cleaned to prevent cross-contamination.
4.2 Balance, capable of reading to the nearest 0,1 mg at the mass load of the crucible.
4.3 Muffle furnace, capable of maintaining a temperature of 1 000 °C ± 25 °C, with provision for air circulation adequate to prevent water vapour retention.
4.4 Desiccator, of borosilicate glass, 150 mm to 250 mm internal diameter with a vacuum stopcock that will allow the evacuation of air.
The desiccator plate should be metal or ceramic or similar that will not break when in contact with a crucible at 1 000 °C. The rim of the desiccator should be lightly greased with silicon grease or petroleum jelly. 150 g to 200 g of silica gel (11) should be replaced daily.
If platinum crucibles are used, metal desiccator plates should not be used.
5 Sampling and samples
5.1 Laboratory sample
For analysis, use a laboratory sample of —100 pim particle size which has been taken and prepared in accordance with ISO 3082.
5.2 Preparation of test samples
Analyses may be performed using either predried test samples (prepared in accordance with ISO 7764).
6 Procedure
6.1 Number of determinations
Carry out the analysis at least in duplicate, using the procedure given in Annex A, independently, on each test sample.
NOTE The expression “independently means that the second and any subsequent result is not affected by the previous result(s). For this particular analytical method, this condition implies that the repetition of the procedure are to be carried out either by the same operator at a different time, or by a different operator, including appropriate recalibration in either case.
6.2 Test portion
Taking several increments, weigh to the nearest 0,000 1 g, approximately 2,0 g ± 0,2 g of the test sample (2).PD ISO/TR 18230 pdf free download.
Tags: Iron ores
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