ISO 556-2020 pdf free download – Coke (greater than 20 mm in size) — Determination of mechanical strength.
lf necessary, continue to filter the coke on sieves of larger aperture, e.g. 120 mm, 150 mm, until lessthan 5 % of the total mass of coke remains on the sieve of largest aperture.
For a full Micum and full rsid test, each test portion shall consist of (50±0.5) kg of coke greater than20 mm (or greater than 40 mm or 60 mm for a full Micum test) and shall contain the same proportion ofcoke within the individual size fractions as determined from the size analysis of the gross sample.
For a half Micum and half Irsid test, each test portion shall consist of (25±0.25) kg of coke greater than20 mm (or greater than 40 mm or 60 mm for a half Micum test) and shall contain the same proportionof coke within the individual size fractions as determined from the size analysis of the gross sample(see 7.1).
The moisture content of the sample shall not exceed 3 %.If the moisture content of the sample exceeds3 %, the coke shall be oven-dried.
lf a sufficient amount of >20 mm coke (or >40 mm or >60 mm, Micum only) coke is produced froma carbonization test, duplicate determinations shall be made, each on a separate 50 kg test portionconstituted from the gross sample (see 9.1.1). If an insufficient amount of >20 mm (or >40 mm or>60 mm, Micum only) coke is produced from a carbonization test, a single determination shall be madeon a 25 kg test portion constituted from the gross sample (see 9.1.1).Micum and lrsid tests may beperformed on the same coke sample.
Note that in reporting coke Micum and/or Irsid results, it shall be specified if a single determination orduplicate determination was made and if a full or half Micum drum was used.
7 Procedure
7.1Test procedure
Specify which test will be executed (Micum, Irsid, half Micum, half lrsid,Micum and Ilrsid, or half Micumand half Irsid).
Table 4 lists conditions for conducting the tests.
For each of the determinations to be made, prepare a test portion from the amount given in Table 4 and charge it into the clean and empty drum, taking care to avoid breakage of the coke during charging.
Secure the cover to the opening on the drum. Rotate the drum at a constant rotational frequency of (25 ± 1) min −1 for the number of revolutions as given for the chosen test in Table 4. Allow the dust to settle for 1 min, remove the opening and empty all the contents of the drum into the tray.
Use the same set of test sieves as for the preparation of the sample, so that a full-size analysis from all contents of the tray will be obtained. In all cases, use at least the sieves of aperture diameter 10 mm, 20 mm and 40 mm. Cumulatively weigh the size fractions of 10 mm and above, noting the mass of each individual size fraction. Weigh separately the fraction of size less than 10 mm and add this fraction also to the cumulatively weighed fractions.
Micum and Irsid tests may be performed on the same coke sample. In this case the sample which is taken out after 100 revolutions, sieved into fractions and weighed shall be retained completely in the drum and treated with an additional 400 revolutions. Check the loss of the test portion after the Micum test is carried out. If it is larger than specified in 8.1, stop further testing. If this combined test (Micum and Irsid test) is executed, it shall be specified in the test report.ISO 556 pdf download.