ISO 4701:2019
Iron ores and direct reduced iron — Determination of size distribution by sieving
This document specifies the methods to be employed for determination of size distributions by sieving of iron ore and direct reduced iron (excluding briquetted iron), utilizing sieves having aperture sizes of 36 µm or larger. The size distribution is expressed in terms of mass and percentage mass, passed or retained on selected sieves. The purpose of this document is to provide a basis for any testing of iron ore and direct reduced iron involving size determination for use by contracting parties in the sale and purchase of these materials.
When this document is used for comparative purposes, the concerned parties will agree on the selection of the detailed method to be employed in order to eliminate sources of subsequent controversy.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principles and planning
4.1 General
4.2 Purpose of the analysis
4.3 Impact of ore and DRI properties
4.3.1 Effect of moisture content
4.3.2 Degradation of material
4.3.3 Magnetic ores
4.4 Nature of sample
4.5 Choice of sieving method
4.6 Maximum particle size permitted on a sieve
4.7 Specified loading of sieves
4.7.1 General
4.7.2 Batch sieving with a single sieve or nest of sieves
4.7.3 Loading of continuous sieving machines
4.8 Sieving time
4.8.1 General
4.8.2 End point ruling
4.8.3 Retention time for continuous sieving machines
5 Apparatus
5.1 Sieve media
5.1.1 Shape of aperture
5.1.2 Size of aperture
5.1.3 Construction of sieve media
5.1.4 Sieve frames for hand or mechanical nest sieving
5.2 Sieving machines
5.3 Accessories for wet sieving
5.4 Drying equipment
5.5 Equipment for the determination of mass
6 Samples
6.1 Derivation of size sample
6.2 Mass of test sample(s) for sieving
6.2.1 General
6.2.2 Minimum mass
7 Procedures
7.1 Drying
7.2 Division
7.3 Preparation and maintenance of sieves for test or nest sieving
7.4 Sieving
7.4.1 General
7.4.2 Hand placing on individual sieves
7.4.3 Hand sieving in the −40 mm to +1 mm range
7.4.4 Hand sieving in the −1 mm range
7.4.5 Mechanical batch sieving
7.4.6 Wet sieving of coarse and fine samples
7.4.7 Continuous machine sieving
7.5 Determination of mass
7.5.1 General
7.5.2 Wet sieving — Determination of mass of solids-content in washings
7.6 Determination of sieving end point
7.6.1 Dry sieving
7.6.2 Wet sieving
8 Verification
8.1 General
8.2 Checking of division
8.3 Verification of sieve media
8.4 Verification of sieving machines
8.5 Verification of weighing devices
9 Results
9.1 Evaluation of results
9.2 Calculation and expression of results
9.3 Repeatability and acceptance of results
10 Test report and working log
11 Precision
11.1 Overall precision, βSPM
11.2 Precision of preparation and measurement, βPM
Annex A (informative) Steps for establishing operating conditions
Annex B (normative) Scheme of sample preparation and sieving procedure
Annex C (normative) Maximum mass to be retained at completion of batch sieving
Annex D (informative) Size apertures in R20 and R40/3 series
Annex E (informative) Typical batch sieving apparatus
Annex F (informative) Desirable features of mechanical sieving machines
Annex G (normative) Procedure for determining the minimum mass of sample used for sieving
Annex H (normative) Flowsheet of the procedure for the acceptance of analytical values for test portions
Annex I (informative) Additional information
Annex J (normative) Determination of the average particle size (APS)
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principles and planning
4.1 General
4.2 Purpose of the analysis
4.3 Impact of ore and DRI properties
4.3.1 Effect of moisture content
4.3.2 Degradation of material
4.3.3 Magnetic ores
4.4 Nature of sample
4.5 Choice of sieving method
4.6 Maximum particle size permitted on a sieve
4.7 Specified loading of sieves
4.7.1 General
4.7.2 Batch sieving with a single sieve or nest of sieves
4.7.3 Loading of continuous sieving machines
4.8 Sieving time
4.8.1 General
4.8.2 End point ruling
4.8.3 Retention time for continuous sieving machines
5 Apparatus
5.1 Sieve media
5.1.1 Shape of aperture
5.1.2 Size of aperture
5.1.3 Construction of sieve media
5.1.4 Sieve frames for hand or mechanical nest sieving
5.2 Sieving machines
5.3 Accessories for wet sieving
5.4 Drying equipment
5.5 Equipment for the determination of mass
6 Samples
6.1 Derivation of size sample
6.2 Mass of test sample(s) for sieving
6.2.1 General
6.2.2 Minimum mass
7 Procedures
7.1 Drying
7.2 Division
7.3 Preparation and maintenance of sieves for test or nest sieving
7.4 Sieving
7.4.1 General
7.4.2 Hand placing on individual sieves
7.4.3 Hand sieving in the −40 mm to +1 mm range
7.4.4 Hand sieving in the −1 mm range
7.4.5 Mechanical batch sieving
7.4.6 Wet sieving of coarse and fine samples
7.4.7 Continuous machine sieving
7.5 Determination of mass
7.5.1 General
7.5.2 Wet sieving — Determination of mass of solids-content in washings
7.6 Determination of sieving end point
7.6.1 Dry sieving
7.6.2 Wet sieving
8 Verification
8.1 General
8.2 Checking of division
8.3 Verification of sieve media
8.4 Verification of sieving machines
8.5 Verification of weighing devices
9 Results
9.1 Evaluation of results
9.2 Calculation and expression of results
9.3 Repeatability and acceptance of results
10 Test report and working log
11 Precision
11.1 Overall precision, βSPM
11.2 Precision of preparation and measurement, βPM
Annex A (informative) Steps for establishing operating conditions
Annex B (normative) Scheme of sample preparation and sieving procedure
Annex C (normative) Maximum mass to be retained at completion of batch sieving
Annex D (informative) Size apertures in R20 and R40/3 series
Annex E (informative) Typical batch sieving apparatus
Annex F (informative) Desirable features of mechanical sieving machines
Annex G (normative) Procedure for determining the minimum mass of sample used for sieving
Annex H (normative) Flowsheet of the procedure for the acceptance of analytical values for test portions
Annex I (informative) Additional information
Annex J (normative) Determination of the average particle size (APS)
Bibliography