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1、 Reference number ISO 4701:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 4701 Third edition 2008-10-01 Iron ores and direct reduced iron Determination of size distribution by sieving Minerais de fer et minerais de fer prrduits Dtermination de la granulomtrie par tamisage Copyright International Organi
2、zation for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT -,-,- ISO 4701:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed b
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5、se by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in
6、 any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22
7、 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT -,-,- ISO 4701:2008(E) ISO
8、 2008 All rights reserved iii Contents Page Foreword. v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 2 4 Principles and planning . 2 4.1 General. 2 4.2 Purpose of the analysis . 2 4.3 Impact of ore and DRI properties 2 4.4 Nature of sample. 4 4.5 Choice of sieving method 4 4.6 Maxi
9、mum particle size permitted on a sieve 5 4.7 Specified loading of sieves 5 4.8 Sieving time. 6 5 Apparatus 7 5.1 Sieve media . 7 5.2 Sieving machines 8 5.3 Accessories for wet sieving 8 5.4 Drying equipment . 8 5.5 Equipment for the determination of mass 8 6 Samples . 10 6.1 Derivation of size sampl
10、e. 10 6.2 Mass of test sample(s) for sieving 10 7 Procedures 11 7.1 Drying. 11 7.2 Division 12 7.3 Preparation and maintenance of sieves for test or nest sieving. 12 7.4 Sieving . 12 7.5 Determination of mass. 17 7.6 Determination of sieving end point. 17 8 Verification 18 8.1 General. 18 8.2 Checki
11、ng of division. 18 8.3 Verification of sieve media 18 8.4 Verification of sieving machines. 18 8.5 Verification of weighing devices. 18 9 Results. 19 9.1 Evaluation of results. 19 9.2 Calculation and expression of results 19 9.3 Repeatability and acceptance of results 20 10 Test report and working l
12、og 21 11 Precision 21 11.1 Overall precision, SPM 21 11.2 Precision of preparation and measurement, PM. 21 Annex A (informative) Steps for establishing the operating conditions for the determination of size distribution using a single sieve or a nest of sieves. 23 Annex B (normative) Scheme of sampl
13、e preparation and sieving procedure. 24 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT -,-,- ISO 4701:2008(E) iv ISO 2008 All rights reserved Annex C (normative) Maximum mass to be
14、retained on a sieve at completion of batch sieving (m) in order to obtain good sieving efficiency25 Annex D (informative) Size apertures in R20 and R40/3 series (taken from ISO 565).27 Annex E (informative) Typical batch sieving apparatus.28 Annex F (informative) Desirable features of mechanical sie
15、ving machines 29 Annex G (normative) Procedure for determining the minimum mass of sample used for sieving .33 Annex H (normative) Flowsheet of the procedure for the acceptance of analytical values for test portions36 Annex I (informative) Additional information.37 Annex J (normative) Determination
16、of the average particle size (APS)39 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT No reproduction or networking permitted without license from IHS ISO 4701:2008(E) ISO 2008 All ri
17、ghts reserved v 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 technical committees. Each member body interested in a subje
18、ct for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC
19、) 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 committe
20、es 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 h
21、eld responsible for identifying any or all such patent rights. ISO 4701 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 1, Sampling. This third edition cancels and replaces the second edition (ISO 4701:1999), which has been technically revised. Copyr
22、ight International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for
23、 Resale, 10/25/2008 05:32:50 MDT No reproduction or networking permitted without license from IHS INTERNATIONAL STANDARD ISO 4701:2008(E) ISO 2008 All rights reserved 1 Iron ores and direct reduced iron Determination of size distribution by sieving 1 Scope This International Standard specifies the m
24、ethods to be employed for determination of size distributions by sieving of iron ore and direct reduced iron (exclude briquetted iron), utilizing sieves having aperture sizes of 36 m or larger. The size distribution is expressed in terms of mass and percentage mass, passed or retained on selected si
25、eves. The purpose of this International Standard 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 International Standard is used for comparative purposes, agree
26、ment should be reached between the concerned parties on selection of the detailed method to be employed in order to eliminate sources of subsequent controversy. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, onl
27、y the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings ISO 2591-1, Test sieving Part 1: Methods using test s
28、ieves of woven wire cloth and perforated metal plate ISO 3082, Iron ores Sampling and sample preparation procedures ISO 3085, Iron ores Experimental methods for checking the precision of sampling, sample preparation and measurement ISO 3086, Iron ores Experimental methods for checking the bias of sa
29、mpling ISO 3087, Iron ores Determination of moisture content of a lot ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth ISO 3310-2, Test sieves Technical requirements and testing Part 2: Test sieves of perforated metal plate ISO 3852, Iron ores for bl
30、ast furnace and direct reduction feedstocks Determination of bulk density ISO 10835, Direct reduced iron and hot briquetted iron Sampling and sample preparation ISO 11323, Iron ore and direct reduced iron Vocabulary Copyright International Organization for Standardization Provided by IHS under licen
31、se with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT -,-,- ISO 4701:2008(E) 2 ISO 2008 All rights reserved 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 11323 apply. 4 Principles and planning 4.1 General T
32、he determination of size distribution of iron ores and direct reduced iron (DRI) may be carried out on a “dry” or “natural” (or “as-received”) basis. Before a particle size determination is carried out, it is necessary to plan the entire sequence of procedures to be followed. The basis for determina
33、tion and the sequence of procedures will depend on: a) the purpose of the size analysis; b) the properties of the iron ore and DRI to be evaluated; c) the form in which the iron ore and DRI is received, e.g. gross sample, increments or partial samples; d) the apparatus available. A typical decision
34、tree to determine the sequence of procedures necessary to perform size analysis is shown in Figure 1. The guidelines for practical application of this International Standard are provided in Annex A. General principles of sieving are given in ISO 2591-1. 4.2 Purpose of the analysis The principal purp
35、oses of particle size determination are as follows. a) To measure the mass and calculate the percentage mass of an ore or DRI passing or retained on one or more specification sieves. The choice of sieve aperture sizes shall be determined by the specification size(s) required together with the necess
36、ity for introducing intermediate aperture sizes to satisfy the maximum particle size and sieve loading constraints. See 4.6 and 4.7. b) To generate an overall size distribution curve. The choice of sieve apertures will depend on the resolution required for the curve and the need to satisfy sieve loa
37、ding constraints. 4.3 Impact of ore and DRI properties 4.3.1 Effect of moisture content The effect of the moisture content of the size sample on sample division and sieving should be assessed before the commencement of the size determination procedure. When it is difficult to conduct sample division
38、 due to sample being adhesive or excessively wet, the sample shall be dried to constant mass in accordance with 7.1. NOTE Partial drying of a sample for the purpose of size distribution analysis is not acceptable, as residual moisture might affect the effective separation of the individual size frac
39、tions. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT -,-,- ISO 4701:2008(E) ISO 2008 All rights reserved 3 Figure 1 Typical decision tree for selecting size determination procedure
40、 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT No reproduction or networking permitted without license from IHS ISO 4701:2008(E) 4 ISO 2008 All rights reserved 4.3.2 Degradation of
41、 material Certain iron ores, particularly lump ore, and DRI may be subject to significant degradation during the sampling and size analysis sequences. Furthermore, different sampling and size analysis processes can cause degradation of ores and DRI to different extents. Consequently this may lead to
42、 significant variation in results for the same lot. It is therefore essential that any degradation should be minimized through the correct design of handling, sampling and size analysis systems. Sampling systems should be designed in accordance with the guidelines set out in ISO 3082 and ISO 10835.
43、4.3.3 Magnetic ores For iron ores with pronounced magnetic properties and DRI that has been handled by magnets, it is desirable to ensure that the size sample be demagnetized or that the sieves are non-magnetic. 4.4 Nature of sample The sample may be received in the form of a gross sample, several p
44、artial samples or increments. The procedures for sampling of iron ores and direct reduced iron (ISO 3082 and ISO 10835) will generally provide quantities of material in excess of the requirements for sieving. If it is undesirable to sieve the entire mass, division of the following is permissible: a)
45、 gross sample; b) partial samples; c) increments; d) fractions obtained during sieving. Methods governing the division and the mass of sample to be sieved are provided in Clause 6. 4.5 Choice of sieving method 4.5.1 Two different sieving methods are available to perform particle size analysis (see A
46、nnex I): a) dry sieving, i.e. sieving without the application of water; b) wet sieving, i.e. sieving with a sufficient application of water to ensure the passage of undersize particles through the sieve apertures. A table summarizing the sample preparation and sieving procedure is given in Annex B.
47、4.5.2 The results of these methods may not be the same. No specific preference is given in this International Standard for either method when sieving iron ore samples. For DRI, dry sieving is recommended. 4.5.3 The choice of sieving method (see 4.5.5) for each part of a size determination shall be m
48、ade on the basis of attaining the defined precision of testing (see 11.1). Details on the procedure shall be recorded in the working log. 4.5.4 If a combination of any of the sieving methods is employed for different parts of the same overall size distribution, the changeover from dry to wet sieving shall be clearly indicated on the report sheet (see Clause 10). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 10/25/2008 05:32:50 MDT -,