AS 4156.1.1:2018 pdf free

AS 4156.1.1:2018 pdf free.Coal preparation Part 1.1: Higher rank coal – Float and sink testing
When coals exhibit low yields in any fraction, to obtain sufficient sample for analytical requirements, the sample mass shall not be less than 20 g and not less than 10 particles in each relative density fraction.
If these requirements cannot be met, this fact shall be noted in the test report.
NOTE 1 This is particularly relevant to float and sink testing of bore core samples.
NOTE 2 Samples with different particle sizes will contain particles with different proportions of mineral matters and organic matters, which will produce different washabilty (different float and sink distribution).Consequently it is critical that a representative sample of the relevant size distribution is provided for float and sink testing.
NOTE 3 It is assumed that square-mesh particle sizes are used; if wedge-wire or round-hole sizes are used, this fact should be reported.
NOTE 4 The mass of the sample to be taken for any given purpose will determine to a large extent the accuracy of the test. In turn, the sample mass will be governed by the purpose for which the test is being carried out.
NOTE 5 When a bulk sample is being taken, it is better to over-sample than to have insufficient material. For testing on the top sizes shown in Table 1, the bulk sample mass may weigh up to 20 t, and for other sizes the amounts should be reduced according to the decrease in nominal topsize. The importance of sufficient sample mass and a method for the determination of the required mass of a bulk sample is given in Appendix B.
Where possible, sample preparation of relative density fractions from a float sink procedure shall be carried out according to ISO 13909-4. However, masses of relative density fractions from float and sink testing are often smaller than the minimum required for subdivision in accordance with ISO 13909-4, but subdivision prior to sample milling is still required to generate samples for caking tests, physical tests, or product composite testing.
Consequently, consideration shall be given to preserving as much sample at 4mm top size as possible to allow subsequent testing. Sample preparation instructions showing sub-division requirements at differing mass ranges shall be documented.AS 4156.1.1 pdf free download.