1 - AS 4156.7:1999 COAL PREPARATION - COAL SIZE CLASSIFYING EQUIPMENT - PERFORMANCE EVALUATION
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
6 - 3 DEFINITIONS
6 - 3.1 General
6 - 3.1.1 Actual feed (F)
6 - 3.1.2 Reference size
6 - 3.1.3 Product
7 - 3.2 Performance parameters
7 - 3.2.1 Theoretical yield (sizing)
7 - 3.2.2 Material placement efficiency, coarser
7 - 3.2.3 Material placement efficiency, finer
7 - 3.2.4 Overall separation index
7 - 3.2.5 Sharpness of separation
7 - 4 PERFORMANCE CRITERIA
7 - 5 PERFORMANCE PARAMETERS
8 - 6 PERFORMANCE TEST PROCEDURES
9 - 7 ANALYTICAL PROCEDURES
9 - 8 EVALUATION AND PRESENTATION OF PERFORMANCE CHARACTERISTICS
9 - 8.1 General
10 - 8.2 Basic data
10 - 8.3 Reconstituted feed size distribution
10 - 8.4 Partition curve
10 - 8.5 Partition size
10 - 8.6 Sharpness of separation
10 - 8.7 Misplaced material curves
11 - 8.8 Misplaced material
11 - 8.9 Equal errors size
11 - 8.10 Theoretical yield
11 - 8.11 Material placement efficiency
12 - 8.12 Near-size material
12 - 8.13 Test and equipment data
12 - 9 TABULAR AND GRAPHIC PRESENTATION
19 - APPENDIX A - CALCULATION OF THE YIELD OF EACH PRODUCT OF A SIZE SEPARATION FROM SIZE ANALYSES OF FEED AND PRODUCT MATERIALS
19 - A1 INTRODUCTION
19 - A2 RECOMMENDED METHODS FOR THE CALCULATION OF YIELD VALUES FROM THE SIZE ANALYSES
19 - A2.1 Symbols
19 - A2.2 Calculation of yield from fractional size analyses
20 - A.2.3 Calculation of yield value from cumulative size analyses
21 - APPENDIX B - WORKED EXAMPLE-VIBRATING SCREEN
28 - APPENDIX C - WORKED EXAMPLE-CYCLONE
35 - APPENDIX D - WORKED EXAMPLE-DEDUSTER
42 - APPENDIX E - WORKED EXAMPLE-SIEVE BEND

Provides principles and methods for the expression of results of performance tests on sizing equipment used in coal preparation. This Standard is based on but not equivalent to ISO10752:1994 and includes an additional worked example in AppendixE.

This Standard sets out the principles and methods for the expression of results of performance tests on sizing equipment used in coal preparation, and includes methods for the evaluation of performance parameters. Performance test procedures and size measurement techniques are recommended. This Standard applies to all types of sizing equipment, categorized as follows:(a) Screens.(b) Classifiers.(c) Others.The procedure described in this Standard applies to two-product separations. Performance assessment of multiproduct separations can be achieved by consideration of a series of two-product separations.

First published as AS 1634-1974.Revised and redesignated AS 4156.7-1999.Reconfirmed 2013. Originated as AS 1634-1974. Revised and redesignated AS 4156.7-1999.