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BS ISO 12743:2021

BS ISO 12743:2021

$215.11

Copper, lead, zinc and nickel concentrates. sampling procedures for determination of metal and moisture content

Published By Publication Date Number of Pages
BSI 2021 86
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This document sets out the basic methods for sampling copper, lead, zinc and nickel concentrates from moving streams and stationary lots, including stopped-belt sampling, to provide samples for chemical analysis, physical testing and determination of moisture content, in accordance with the relevant International Standards. Where the concentrates are susceptible to significant oxidation or decomposition, a common sample that is sufficiently representative, i.e. unbiased and sufficiently precise, is used for moisture determination and chemical analysis to eliminate bias (see ISO 10251). Any large agglomerates (>10 mm) present in the primary sample are crushed prior to further sample processing. Sampling of concentrates in slurry form is specifically excluded from this document.

Stopped-belt sampling is the reference method for collecting concentrate samples against which mechanical and manual-sampling procedures can be compared. Sampling from moving streams is the preferred method. Both falling-stream and cross-belt samplers are described.

Sampling from stationary lots is used only where sampling from moving streams is not possible. The procedures described in this document for sampling from stationary lots only minimize some of the systematic sampling errors.

PDF Catalog

PDF Pages PDF Title
2 National foreword
8 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
12 4 Sampling theory
4.1 General
4.2 Total variance
14 4.3 Sampling-stage method of estimating sampling and total variance
16 4.4 Simplified method of estimating sampling and total variance
17 4.5 Interleaved sample method of measuring total variance
20 5 Establishing a sampling scheme
25 6 Mass of increment
6.1 General
6.2 Mass of increment for falling-stream samplers
6.3 Mass of increment for cross-belt samplers
6.4 Mass of increment for manual sampling from stationary lots
6.4.1 Primary increments
26 6.4.2 Mass of secondary and subsequent increments
6.5 Mass of increment for stopped-belt reference sampling
7 Methods of sampling from concentrate streams
7.1 General
7.2 Mass-basis systematic sampling
7.2.1 General
7.2.2 Sampling interval
27 7.2.3 Sample cutter
7.2.4 Taking of primary increments
7.2.5 Constitution of subsamples and lot samples
28 7.2.6 Types of division
7.2.7 Division of increments
7.2.8 Division of subsamples
7.2.9 Division of lot samples
29 7.3 Time-basis systematic sampling
7.3.1 General
7.3.2 Sampling interval
7.3.3 Sample cutter
7.3.4 Taking of primary increments
30 7.3.5 Constitution of subsamples and lot samples
7.3.6 Types of division
7.3.7 Division of increments and subsamples
7.3.8 Division of lot samples
7.4 Stratified random sampling
7.4.1 Fixed mass intervals
7.4.2 Fixed time intervals
31 8 Mechanical sampling of concentrate streams
8.1 General
8.2 Design of the sampling system
8.2.1 Safety of operators
8.2.2 Location of sample cutters
8.2.3 Provision for interleaved sampling
8.2.4 Provision for stratified random sampling
32 8.2.5 Checking precision and bias
8.2.6 Avoiding bias
8.2.7 Minimizing bias
8.2.8 Configuration of the sampling system
8.3 Sample cutters
8.3.1 General
33 8.3.2 Design criteria
34 8.3.3 Cutter speed
8.4 Mass of increments
35 8.5 Number of increments
8.6 Sampling interval
8.7 Routine checking
36 9 Manual sampling of concentrate streams
9.1 General
9.2 Choosing the sampling location
9.3 Sampling implements
9.4 Mass of increments
9.5 Number of increments
9.6 Sampling interval
37 9.7 Sampling procedures
9.7.1 General
9.7.2 Full stream cut from a falling stream
9.7.3 Partial stream cuts from a falling stream
38 9.7.4 Sampling from moving conveyor belts
10 Stopped-belt reference sampling
39 11 Sampling from grabs
11.1 General
11.2 Mass of primary increments
11.3 Number of primary increments
11.4 Method of sampling
11.5 Constitution of subsamples and lot samples
40 12 Sampling from trucks, railway wagons and sampling hoppers
12.1 General
12.2 Mass of primary increments
12.3 Number of primary increments
12.4 Method of sampling
12.5 Constitution of subsamples and lot samples
43 13 Sampling of concentrate in bags or drums
13.1 General
13.2 Mass of primary increments
13.3 Number of primary increments
44 13.4 Method of sampling
13.4.1 General
13.4.2 Sampling during filling or emptying
13.4.3 Spear sampling
13.5 Constitution of subsamples and lot samples
45 14 Sampling of stockpiles
15 Methods of comminution, mixing and division
15.1 General
15.2 Comminution
15.2.1 General
15.2.2 Mills
46 15.3 Mixing
15.3.1 General
15.3.2 Methods of mixing
47 15.4 Division
15.4.1 Chemical analysis samples
48 15.4.2 Moisture samples
15.4.3 Number of increments for division
15.4.4 Minimum mass of divided sample
49 15.4.5 Rotary sample division
50 15.4.6 Cutter-type division
15.4.7 Manual increment division
15.4.8 Spear division
51 15.4.9 Fractional shovelling
52 15.4.10 Ribbon division
54 15.4.11 Riffle division
56 16 Sample requirements
16.1 Moisture samples
16.1.1 Mass of test portion
16.1.2 Processing of samples
16.2 Chemical analysis samples
57 16.3 Physical test samples
17 Packing and marking of samples
58 Annex A (normative) Sampling stage method of estimating sampling and total variance
65 Annex B (informative) Estimation of total variance — Barge unloading using a grab
69 Annex C (informative) Mechanical sample cutters
74 Annex D (informative) Checklist for mechanical sampling systems
78 Annex E (normative) Manual sampling devices
80 Annex F (informative) Apparatus for manual sampling of concentrates from stopped belts
81 Annex G (informative) Sampling of stockpiles
83 Annex H (normative) Increment division scoops for conducting manual increment division
84 Bibliography

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BS ISO 12743:2021
$215.11