Sampling and sample preparation procedures
The Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 1, Sampling, created ISO 3082:2017. The fourth version (ISO 3082:2009), which has been technically changed, is canceled and replaced by ISO 3082:2017.
The ISO 3082:2017 specification offers:
a) the underlying theory,
b) the basic principles for sampling and preparation of samples, and
c) the basic requirements for the design, installation and operation of sampling systems
The procedures outlined in ISO 3082:2017 are applicable to the loading and unloading of a lot using belt conveyors and other ore-handling machinery that can be fitted with a mechanical sampler or when manual sampling may be done in a safe manner.
Therefore, The techniques work with all types of iron ores, whether they are raw or processed (e.g. concentrates and agglomerates, such as pellets or sinters).
The following words and meanings, as well as those in ISO 11323, are applicable for the purposes of ISO 3082:2017
1. Lot
Discrete and defined quantity of iron ore or direct reduced iron for which quality characteristics are to be assessed.
2. Increment
Quantity of iron ore or direct reduced iron collected in a single operation of a device for sampling or sample division.
3. Sample
relatively small quantity of iron ore or direct reduced iron, so taken from a lot as to be representative in respect of the quality characteristics to be assessed.
4. Partial sample
Sample comprising of less than the complete number of increments needed for a gross sample.
5. Gross sample
Sample comprising all increments, entirely representative of all quality characteristics of a lot.
6. Test sample
Sample prepared from an increment, a partial sample or a gross sample to meet all specific conditions for a test.
7. Test portion
Part of a test sample that is actually and entirely subjected to the specific test.
8. Stratified sampling
Sampling of a lot carried out by taking increments from systematically specified positions. Also, in appropriate proportions from strata.
9. Systematic sampling
Sampling carried out by taking increments from a lot at regular intervals.
10. Mass-basis sampling
Sampling carried out so that increments are taken at equal mass intervals, increments being as near as possible of uniform mass.
11. Time-basis sampling
Sampling carried out so that increments are taken from free falling streams, or from conveyors, at uniform time intervals, the mass of each increment being proportional to the mass flow rate at the instant of taking the increment.
12. Proportional mass division
Division of samples or increments such that the mass of each retained divided portion is a fixed proportion of the mass being divided.
13 Constant mass divisions
Divisions of samples or increments such that the retained divided portions are of almost uniform mass, irrespective of variations in mass of the samples or increments being divided.
14. Split use of sample
Separate use of parts of a sample, as test samples for separate determinations of quality characteristics.
15. Multiple use of sample
Use of a sample in its entirety for the determination of one quality characteristic, followed by the use of the same sample in its entirety for the determination of one or more other quality characteristics.
16. Nominal top size
Particle size expressed by the smallest aperture size of the test sieve (from a square opening complying with the R20 or R40/3 series in ISO 565), such that no more than 5 % by mass of iron ore is retained on the sieve.
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