BS 5663-2:1987

National foreword
Committees responsible
Method
1 Scope
2 Field of application
3 References
4 Definitions
5 Apparatus
6 Derivation of size sample
7 Mass of sample used for sieving
8 Division of size sample
9 Effect of moisture content
10 Choice of dry or wet seiving
11 Procedure for drying iron ore
12 Determination of mass
13 Sieve loading for test sieving
14 Maximum particle size permitted on a sieve
15 Sieving time
16 General principles of sieving
17 Sieving procedures for coarse ores (sieve apertures
    11,2 mm and above)
18 Sieving procedure for fine ores (sieve apertures
    less than 11,2 mm)
19 Additional rules for wet sieving of coarse and fine
    ores
20 Report sheet and working log
21 Precision
Annexes
A Maximum mass of iron ore to be retained on a sieve
    at completion of batch sieving (m) in order to
    obtain good sieving efficiency
B Typical batch sieving apparatus
C Desirable features of mechanical sieving machines
D Sieve aperture sizes in the R20 series
E Determination of the sieving end-point
F Procedure for determining the minimum mass of sample
    used for sieving
G Examples of minimum mass of divided size gross
    sample in the division methods other than increment
    division method and division precision (beta DM)
Tables
1 Maximum particle size permitted on a sieve
2 Examples of sieving times, using batch methods, for
    stable ores
3 Values for P (percentage of specification size)
Figures
1 A simple arrangement of wet sieving apparatus
2 Derivation of the samples used for sieving
3 Typical decision tree for selecting size
    determination procedure
4 Alternative methods for use of individual sieves for
    iron ore of -11,2 mm + 1 mm
5 Example of suggested format for report of the
    determination of the size distribution of iron ore
6 Typical batch sieving apparatus
7 Suggested wet-sieving procedure for fine ores (-11,2
    mm)
8 One deck, one drive
9 Multi-deck, one drive
10 Multi-deck, multi-drive, coarse particles removed
    first
11 Multi-deck, multi-drive, fine particles removed
    first

Sets out methods to be employed for determining size distributions by sieving of iron ore, whether natural or processed (e.g. concentrates and agglomerates, such as pellets, sinters or briquettes), utilizing sieves with aperture sizes of 45 micron m and over. The sample is subjected to sieving procedures to determine the size distribution of the constituent particles. The size distribution is to be expressed in terms of mass and percentage mass, passed or retained on selected sieves. The methods described are suitable to size determination utilizing one, two or several sieves.