ISO 16742:2014

DRAFT INTERNATIONAL STANDARD ISO/DIS 16742
ISO/TC 102/SC 1 Secretariat: JISC
Voting begins on Voting terminates on

2013-04-05 2013-07-05
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION  •  МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ  •  ORGANISATION INTERNATIONALE DE NORMALISATION

Iron ores — Sampling of slurries
Minerais de fer — Échantillonnage des schlamms

ICS 73.060.10
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©  International Organization for Standardization, 2013

ISO/DIS 16742
©  ISO 2013
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ii © ISO 2013 – All rights reserved

Iron Ores - Sampling of Slurries – DIS 16742 ISO/TC 102/SC 1 N 1079
Contents Page
Foreword .v
1 Scope.1
2 Normative references.1
3 Definitions .2
4 General considerations for sampling slurries.2
4.1 Basic requirements .2
4.2 Sampling errors.3
4.3 Establishing a sampling scheme.4
5 Fundamentals of sampling and sample preparation.6
5.1 Minimization of bias .6
5.2 Volume of increment for falling stream samplers to avoid bias .7
5.2.1 Linear cross-stream cutter .7
5.2.2 Vezin cutter .8
5.3 Volume of increment for manual sampling to avoid bias .8
5.4 Overall precision .9
5.5 Quality variation .10
5.6 Sampling precision and number of primary increments.11
5.7 Precision of sample preparation and overall precision .11
6 Minimum mass of solids in gross and partial samples.12
6.1 General .12
6.2 Minimum mass of solids in gross samples .12
6.3 Minimum mass of solids in partial samples .13
7 Time-basis sampling.13
7.1 General .13
7.2 Sampling interval.13
7.3 Cutters .13
7.4 Taking of increments .14
7.5 Constitution of gross or partial samples .14
7.6 Division of increments and partial samples .14
7.7 Division of gross samples.14
7.8 Number of cuts for division.14
8 Stratified random sampling within fixed time intervals.14
9 Mechanical sampling from moving streams .15
9.1 General .15
9.2 Design of the sampling system .15
9.2.1 Safety of operators.15
9.2.2 Location of sample cutters.15
9.2.3 Provision for duplicate sampling.15
9.2.4 System for checking the precision and bias .15
9.2.5 Minimizing bias.16
9.3 Slurry sample cutters.16
9.3.1 General .16
9.3.2 Falling-stream cutters.17
9.3.3 Cutter velocities.17
9.4 Mass of solids in increments .17
9.5 Number of primary increments .17
9.6 Routine checking.17
ISO/TC 102/SC 1 N 1079 Iron Ores - Sampling of Slurries – DIS 16742
10 Manual sampling from moving streams. 18
10.1 General. 18
10.2 Choosing the sampling location . 18
10.3 Sampling implements. 18
10.4 Volume of increments . 18
10.5 Number of primary increments . 18
10.6 Sampling procedures . 19
11 Sampling of stationary slurries. 19
12 Sample preparation procedures. 19
12.1 General. 19
12.2 Grinding mills. 20
12.3 Sample division. 20
12.4 Chemical analysis samples . 20
12.5 Physical test samples . 20
13 Packing and marking of samples. 20
Annex A (informative) Examples of correct slurry sampling devices . 21
Annex B (informative) Examples of incorrect slurry sampling devices . 23
Annex C (normative) Manual sampling implements . 26

iv © ISO 2003 — All rights reserved

Iron Ores - Sampling of Slurries – DIS 16742 ISO/TC 102/SC 1 N 1079
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
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established has the right to be represented on that committee. International organizations, governmental and
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International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75% of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
This Working Draft was prepared by Technical Committee ISO/TC 102/SC 1, Iron ores and direct reduced iron
- Sampling.
Iron Ores - Sampling of Slurries – DIS 16742 ISO/TC 102/SC 1 N 1079

Iron ores – Sampling of slurries
WARNING – This International Standard may involve hazardous materials, operations and
equipment, and does not purport to address all the safety issues associated with its use. It is the
responsibility of the user of this International Standard to establish appropriate health and safety
practices and determine the applicability of regulatory limitations prior to use.

1 Scope
This International Standard sets out the basic methods for sampling fine iron ore of nominal top size <1 mm
that is mixed with water to form a slurry. At very high ratios of fine solids to water when the material assumes
a soft plastic form (about 80% solids depending on the particle size distribution of the solids), the mixture is
correctly termed a paste. Sampling of pastes is not covered in this International Standard.
The procedures described in this International Standard apply to sampling of iron ore that is transported in
moving streams as a slurry. These streams may fall freely or be confined in pipes, launders, chutes, spirals or
similar channels. Sampling of slurries in pressurised pipes is not covered in thi
...