ISO 728-2021 pdf download

ISO 728-2021 pdf download.Coke一Size analysis by sieving. 7.2 DivIsion of coke mInus 22,4 mm Divide the sample (minus 22,4 mm lraction from 71 e) to the required minimum mass in TablvJ. means of a suitable mechanical sample divider or riffle avoiding size degradation and loss of dust. Alternatively, for division. use either the flattened heap method or the strip mixing method described In ISO 13909-6 and ISO 18281 Determine the mass of all the coke not included is part of the test sample and retain It until all analyses and calculations are complete. 7.3 SlzI.g sample 01 maximum particle size between 224 and 4mm — Manual method a) Determine the mass (of the dwided minus 22,4 mm traction from 72) of the sample to the nearest 0,1 %. hI Position the largest aperture size sieve In the set over an empty receiver or hin Move the sieve horizontally to and [ro. with the displacement not exceeding 100 mm in either direction, to c.luse the pieces of coke to tumble or roll on the sieve. c) Continue the sieving motion until eight movements In each direction (a total or 16 movements) )save taken place after the last undersize piece passes through the sieve Avoid any impact when stopping the motion. d) Place the coke remaining on the sieve In a tired receiver and determine the mass of the size traction. e) Sieve the undersize again by repeating the above process for each sieve down to and Including the 4,0 inns aperture size sieve and redetermine the mass cii each size fraction including the inlnu 4.0mm fraction. Th. mass of the minus 4.0mm fraction from 7.3 r) may also he reduced in a similar faihism to 72 beFore proceeding to 7.4. 7.4 SIziag sample of particle size less than 4.0mm — Manual method a) Determine the mass lot the divided minus 4.0mm fraction from 7.3 e) to the nearest 0.1 %. b) Place the smallest aperture size sieve in the set on a receiver or bin. Brush the sample onto the sIeve. fit the lid and sieve continuously for a S mm (minute) period, as described in iteffi c), to remove the undersize. lithe sample Is large, sieve it as separate portions so that not more than 75% of the area nithe sieve Is covered at the end or each sieving operation. c) Hold the receiver, fitted with the sieve and Its...