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AS 4932.4-2002
[Current]Representation of results of particle size analysis, Part 4: Characterization of a classification process
Specifies the mathematical background for the characterization of a classification process. This Standard is not limited to an application in particle size analysis, the same procedure may be used for the characterization of a technical classification process (e.g. air classification, centrifugal classification) or a separation process (e.g. gas or hydrocyclone). This Standard is identical with and has been reproduced from ISO 9276-4:2001.
Published: 20/06/2002
Pages: 17
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Symbols
2.1 Symbols for specific terms
2.2 Subscripts
3 Characterization of a classification process based on error-free distribution curves and mass balances
3.1 Density distribution curves representing a classification process
3.2 Mass and number balances
3.2.1 Mass and number balance in the size range from xmin to xmax
3.2.2 Mass and number balance in the size range from x to x + dx
3.2.3 Mass and number balance in the size range from xmin to x
3.2.4 The indirect evaluation of vr,f and vr,c
3.3 Definitions of cut size, xe
3.3.1 General
3.3.2 The equiprobable cut size, xe, the median of the grade efficiency curve
3.3.3 The analytical cut size, xa
3.4 Grade efficiency, T, the grade efficiency curve, T(x), (Tromp’s curve)
3.5 Measures of sharpness of cut
3.5.1 General
3.5.2 Parameters formed with characteristic particle sizes
3.5.3 Parameters derived from cumulative distribution curves
3.5.4 The total classification or separation efficiency, To
4 The influence of systematic errors on the determination of grade efficiency curve
4.1 General
4.2 Systematic error due to a splitting process in the classifier
4.3 Incomplete dispersion of the feed material
4.4 The influence of comminution of the feed in the classifier
Appendix A
A.1 General
A.2 The indirect evaluation of vr,f and vr,c
A.3 The evaluation of the grade efficiency curve, T(x), from erroneous cumulative size distributions
Bibliography
Amendment 1
Amendment control sheet
AS 4932.4—2002
Amendment No. 1 (2023)
Revised text amendment
Cited references in this standard
Content history
[Current]
[Current]
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AS 4932.4-2002 Rec:2016
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