AS 2806.1-1994

1 - AS 2806.1-1994 ALUMINIUM ORES-SAMPLING - SAMPLING PROCEDURES
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPEThis
6 - 2 REFERENCED DOCUMENTS
6 - 3 DEFINITIONS
6 - 3.1 Bias
6 - 3.2 Constant-mass division
6 - 3.3 Cut
6 - 3.4 Divided increment
6 - 3.5 Division
7 - 3.6 Duplicate sampling
7 - 3.7 Fixed-rate division
7 - 3.8 Gross sample
7 - 3.9 Increment
7 - 3.10 Isolated lot
7 - 3.11 Lot
7 - 3.12 Manual sampling
7 - 3.13 Mass-basis sampling
7 - 3.14 Mechanical sampling
7 - 3.15 Nominal top size
7 - 3.16 Reduction (in particle size)
7 - 3.17 Replicate sampling
7 - 3.18 Sampling unit
7 - 3.19 Strata
7 - 3.20 Stratified random sampling
7 - 3.21 Subsample
7 - 3.22 Systematic sampling
7 - 3.23 Time- basis sampling
7 - 4 ESTABLISHING A SAMPLING SCHEME
7 - 4.1 General
8 - 4.2 Safety of operators
8 - 4.3 General procedure for sampling
9 - 4.4 Overall variance
10 - 5 NUMBER OF PRIMARY INCREMENTS AND SAMPLING UNITS
10 - 5.1 General
10 - 5.2 Calculation of the number of primary increments
13 - 5.3 Calculation of the number of subsamples
13 - 6 MASS OF GROSS SAMPLES AND SUBSAMPLES
13 - 6.1 Minimum mass of gross sample
13 - 6.1.1 General
13 - 6.1.2 Experimental technique
14 - 6.1.3 Fully-experimental technique
15 - 6.2 Minimum mass of subsamples
15 - 6.3 Minimum mass of crushed gross samples and subsamples
15 - 7 MASS OF INCREMENT
15 - 7.1 Minimum mass of primary increment
15 - 7.2 Actual mass of increment for sampling from moving streams
15 - 7.3 Subdivision of large primary increments
16 - 7.4 Minimum mass of crushed increments
16 - 8 MASS-BASIS SAMPLING
16 - 8.1 General
16 - 8.2 Sampling interval
16 - 8.3 Cutter
19 - 8.4 Taking of primary increments
19 - 8.5 Constitution of a gross sample or subsample
19 - 8.6 Methods of division
19 - 8.7 Division of increments
19 - 8.8 Division of subsamples
20 - 8.9 Division of gross samples
20 - 8.10 Number of cuts for division
20 - 9 TIME-BASIS SAMPLING
20 - 9.1 General
20 - 9.2 Sampling interval
20 - 9.3 Cutter
21 - 9.4 Taking of primary increments
21 - 9.5 Constitution of gross sample or subsample
21 - 9.6 Division of increments and subsamples
21 - 9.7 Division of gross samples
21 - 9.8 Number of cuts for division
22 - 10 STRATIFIED RANDOM SAMPLING- FIXED MASS OR TIME INTERVALS
22 - 10.1 Fixed mass intervals-General procedure
22 - 10.2 Fixed time intervals-General procedure
22 - 11 MECHANICAL SAMPLING FROM MOVING STREAMS
22 - 11.1 General
22 - 11.2 Design of the sampling system
22 - 11.2.1 Location of sampling equipment
22 - 11.2.2 Provision for duplicate sampling
22 - 11.2.3 System for checking the precision and bias
23 - 11.2.4 Minimizing bias in the sample
23 - 11.2.5 Arrangement of sampling system
23 - 11.3 Sample cutters
23 - 11.3.1 General
23 - 11.3.2 Falling-stream cutters
23 - 11.3.3 Cross-belt cutters
24 - 11.3.4 Cutter speeds
26 - 11.4 Mass of increments
26 - 11.5 Number of increments
26 - 11.6 Routine checking
26 - 12 MANUAL SAMPLING FROM MOVING STREAMS
26 - 12.1 General
26 - 12.2 Choosing the sampling location
26 - 12.3 Sampling implements
26 - 12.4 Mass of increments
26 - 12.5 Number of primary increments
26 - 12.6 Sampling procedures
26 - 12.6.1 Single operation of the ladle
26 - 12.6.2 Multiple operations of the ladle
27 - 13 STOPPED-BELT SAMPLING
28 - 14 SAMPLING FROM STATIONARY SITUATIONS
28 - 14.1 General
28 - 14.2 Uniformity of primary increment mass
28 - 14.3 Bias testing
28 - 14.4 Sampling implements for stockpiles, wagons and ships’ holds
28 - 14.4.1 Shovels
29 - 14.4.2 Augers
29 - 14.4.3 Ladles
29 - 14.5 Samples from stockpiles
29 - 14.5.1 General
30 - 14.5.2 Selection of sampling points
30 - 14.5.3 Method
30 - 14.6 Sampling from wagons or trucks
30 - 14.6.1 Sampling from the top
30 - 14.6.2 Sampling from wagons during bottom discharge or trucks during tailgate discharge
30 - 14.7 Sampling from ships’ holds
30 - 15 PACKING AND MARKING OF SAMPLES
31 - APPENDIX A - DERIVATION OF EQUATION FOR MINIMUM GROSS SAMPLE MASS
33 - APPENDIX B - MECHANICAL SAMPLING DEVICES
33 - B1 SCOPE
33 - B2 TYPES OF MECHANICAL SAMPLING DEVICES
38 - APPENDIX C - MANUAL SAMPLING IMPLEMENT-MOVING STREAMS
38 - C1 SCOPE
39 - APPENDIX D - MANUAL SAMPLING IMPLEMENT-STATIONARY SITUATIONS
39 - D1 SCOPE
39 - D2 SAMPLING FRAME
39 - D3 AUGER
39 - D4 SHOVELS

Sets out requirements for the sampling of aluminium ores from moving streams and stationary situations, including stopped-belt sampling, to provide subsamples or gross samples for sample preparation.

This Standard sets out requirements for the sampling of aluminium ores from moving streams and stationary situations, including stopped-belt sampling, to provide subsamples or gross samples for sample preparation.Although this Standard is intended to cover all aluminium ore sampling from moving streams, the procedures recommended may not be applicable in cases of extreme segregation, very wet ore due to its sticky nature, or very dry ore due to generation of dust. In such cases, it may be necessary to revert to stopped-belt sampling.NOTE: Stopped-belt sampling is the reference method for collecting ore samples against which other sampling procedures may be compared. Sampling from moving streams is the preferred method. Sampling from stationary situations should be considered only if sampling from moving streams is not possible. The procedures described in this Standard for sampling from stationary situations merely minimize some of the sampling errors.

First published in part as AS 2806.1-1985.
AS 2806.2 first published 1985.
AS 2806.1-1985 and AS 2806.2-1985 revised, amalgamated and designated AS 2806.1-1994.