IS0 1953:2015 pdf download.Hard coal —Size analysis by sieving.
6.2.2 Sample of maximum particle size between 4 mm and 22,4 mm—manual method The following procedure applies:
a) Weigh the sample to the nearest 0,1 % of the mass of the sample.
b) Position the largest aperture size sieve in the set (4JJ,) over an empty receiver (41.2). Move the sieve horizontally to and fro, with the displacement not exceeding 100 mm in either direction, so as to cause the pieces of coal to tumble or roll on the sieve.
c) Continue the sieving motion until eight movements in each direction (a total of 16 movements) have taken place after the last undersize piece passes through the sieve. Avoid any Impact when stopping the motion.
d) Place the coal remaining on the sieve in a weighed receiver and reweigh to obtain the mass of the size fraction.
e) Resieve the undersize by repeating the above process for each sieve down to and including the 4 mm aperture size sieve. If analysis of the undersize from the 4 mm aperture size sieve is required, proceed as described in 7.2.3.
NOTE When using square-hole sieves, the sides of the holes should be parallel to the direction of the sieving motion.
6.2.3 Sample of maximum particle size less than 4 mm—manual method The following procedure applies:
a) Weigh the sample to the nearest 0,1 % of the mass of the sample.
b) Place the smallest aperture size sieve in the set (4JJ) on a receiver (4,j), brush the sample onto the sieve, fit the lid (41) and sieve continuously for 5 mm, as described in Item c) below, to remove the undersize. If the sample is large, sieve it as separate portions so that not more than 75 % of the area of the sieve is covered at the end of each sieving operation.
a) Weigh the sample to the nearest 0,1 % of the mass of the sample.
b) Position the largest aperture size sieve in the set (4JJ,) over an empty receiver (41.2). Move the sieve horizontally to and fro, with the displacement not exceeding 100 mm in either direction, so as to cause the pieces of coal to tumble or roll on the sieve.
c) Continue the sieving motion until eight movements in each direction (a total of 16 movements) have taken place after the last undersize piece passes through the sieve. Avoid any Impact when stopping the motion.
d) Place the coal remaining on the sieve in a weighed receiver and reweigh to obtain the mass of the size fraction.
e) Resieve the undersize by repeating the above process for each sieve down to and including the 4 mm aperture size sieve. If analysis of the undersize from the 4 mm aperture size sieve is required, proceed as described in 7.2.3.
NOTE When using square-hole sieves, the sides of the holes should be parallel to the direction of the sieving motion.
6.2.3 Sample of maximum particle size less than 4 mm—manual method The following procedure applies:
a) Weigh the sample to the nearest 0,1 % of the mass of the sample.
b) Place the smallest aperture size sieve in the set (4JJ) on a receiver (4,j), brush the sample onto the sieve, fit the lid (41) and sieve continuously for 5 mm, as described in Item c) below, to remove the undersize. If the sample is large, sieve it as separate portions so that not more than 75 % of the area of the sieve is covered at the end of each sieving operation.
