BS ISO 4701:2017 pdf free
BS ISO 4701:2017 pdf free.Iron ores and direct reduced iron – Determination of size distribution by sieving
This procedure is applicable to round sieves with 200 mm and 300 mm diameters, using a single sieve or a sequence of individual sieves. In this size range, a sieve together with a lid and receiver pan shall be used.
a) Use an individual sieve with a receiver pan. When using a sequence of individual sieves, start with the largest aperture. Place it on a smooth platform (to minimize attrition).
b) Place the charge on the sieve and fit the lid.
c) Take the sieve in both hands and slide it back and forth on the platform at a frequency about 120 times per minute at an amplitude of about 95 mm for 1 min. The back and forth movement should be interrupted three times per minute, turn the sieve 90° and give a hard tap by hand against the sieve frame. A periodic vertical shake may be given. If the particles are difficult to sieve or when using fine sieves, the underside of the sieve medium shall be cleaned gently with a soft brush in order to loosen trapped particles. The resulting dust or particles released below the sieve are added to the undersize material.
d) Terminate sieving either on satisfying the end point rule or at completion of a fixed sieving time.See 4.8 and 7.6.
e) Weigh the separated particle size fractions individually.
This procedure is applicable to any size of iron ore and DRI using a single sieve or nest of sieves. The machine shall satisfy the criteria given in 5.2.
a) Assemble the nest of sieves with the largest aperture at the top and the receiver pan at the base.
b) Place the charge on the top sieve and fit the lid.
c) Attach the nest of sieves to the mechanical shaker.
d) Terminate sieving either on satisfying the end point rule or at completion of a fixed sieving time.See 4.8 and 7.6.
e) Weigh the separated particle size fractions individually.BS ISO 4701 pdf download.
