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1、BRITISH STANDARD BS ISO 3085:2002 Iron ores Experimental methods for checking the precision of sampling, sample preparation and measurement ICS 73.060.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2
2、006, Uncontrolled Copy, (c) BSI BS ISO 3085:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 25 April 2002 BSI 25 April 2002 ISBN 0 580 395
3、97 9 National foreword This British Standard reproduces verbatim ISO 3085:2002 and implements it as the UK national standard. It supersedes BS ISO 3085:1996 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/58, Iron ores, which has the responsibilit
4、y to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Internationa
5、l Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British
6、 Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and E
7、uropean developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 21 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendm
8、ents issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 3085:2002(E) INTERNATIONAL STANDARD ISO 3085 Fourth edition 2002-03-01 Iron ores Experimental methods for checking the p
9、recision of sampling, sample preparation and measurement Minerais de fer Mthodes exprimentales de contrle de la fidlit de lchantillonnage, de prparation des chantillons et de mesurage Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3085:
10、2002(E) ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3085:2002(E) iii Contents Page Foreword.iv 1 Scope1 2 Normative references1 3 Definitions 1 4 Principle1 5 General conditions2 6 Method of experiment .3 7 Analysis of experimenta
11、l data7 8 Interpretation of results and action.12 9 Test report12 Annex A (informative) Example of experiment on periodic systematic sampling by method 1.14 Annex B (informative) Alternative method for analysis of experimental data20 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GM
12、T+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3085:2002(E) iv 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 commi
13、ttees. Each member body interested in a subject 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 I
14、nternational 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 3. The main task of technical committees is to prepare International Standards. Draft Internationa
15、l 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 International Stand
16、ard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3085 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 1, Sampling. This fourth edition cancels and replaces the third which h
17、as been technically revised. Annexes A and B of this International Standard are for information only. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 3085:2002(E) 1 Iron ores Experimental methods for checking the p
18、recision of sampling, sample preparation and measurement 1 Scope This International Standard specifies experimental methods for checking the precision of sampling, sample preparation and measurement of iron ores being carried out in accordance with the methods specified in ISO 3082 and the relevant
19、ISO standards for measurement. NOTE This International Standard may also be applied for the purpose of checking the precision of sampling, sample preparation and measurement separately. 2 Normative references The following normative documents contain provisions which, through reference in this text,
20、 constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recen
21、t editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 3082:2000, Iron ores Sampling and sample preparation procedures I
22、SO 3084:1998, Iron ores Experimental methods for evaluation of quality variation ISO 11323:1), Iron ore and direct reduced iron Vocabulary 3 Definitions For the purposes of this International Standard, the definitions given in ISO 11323 apply. NOTE The precision of sampling is defined mathematically
23、 in annex A of ISO 3082:2000. 4 Principle Sampling from twenty lots or more, preferably taking twice as many increments as specified in ISO 3082 and placing the increments alternately into two gross samples. If this is impracticable or the precision testing is carried out in conjunction with routine
24、 sampling, the normal number of increments specified in ISO 3082 may be used. Preparation of separate test samples from each gross sample and determination of relevant quality characteristics. Analysis of the experimental data obtained and calculation of the estimated value of the precision of sampl
25、ing, sample preparation and measurement for each selected quality characteristic. 1) To be published. (Revision of ISO 11323:1996) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3085:2002(E) 2 Comparison of the estimated precision with
26、that specified in Table 1 of ISO 3082:2000 and necessary action if the estimated precision does not attain these specified values. 5 General conditions 5.1 Sampling 5.1.1 General The sampling procedure to be followed shall be selected from the two methods of sampling, viz. periodic systematic sampli
27、ng or stratified sampling, depending on the method of taking increments from the lot in accordance with ISO 3082. 5.1.2 Number of lots To reach a reliable conclusion, it is recommended that the experiment be carried out on more than 20 lots of the same type of iron ore. However, if this is impractic
28、able, at least 10 lots should be covered. If the number of lots for the experiment is not sufficient, each lot may be divided into several parts to produce more than 20 parts in total for the experiment, and the experiment should be carried out on each part, considering each part as a separate lot i
29、n accordance with ISO 3082. 5.1.3 Number of increments and number of gross samples The number of increments required for the experiment shall preferably be twice the number specified in ISO 3082. Hence, if the number of increments required for routine sampling is n1 and one gross sample is made up f
30、rom these increments, the number of increments required for the experiment shall be 2n1 and two gross samples shall be constituted. Alternatively, if the experiment is carried out as part of routine sampling, n1 increments may be taken and two gross samples constituted, each comprising n1/2 incremen
31、ts. In this case the sampling precision obtained will be for n1/2 increments. The precision thus obtained must be divided by 2 to obtain the precision for gross samples comprising n1 increments (see clause 7). When the experiment is carried out with n1 increments and n1 is an odd number, an addition
32、al increment shall be taken in order to make the number of increments even. 5.2 Sample preparation and measurement Sample preparation shall be carried out in accordance with ISO 3082. The measurement shall be carried out in accordance with the relevant ISO standards for chemical analysis, moisture c
33、ontent and size analysis of iron ores. NOTE 1 For chemical analysis it is preferable to carry out a series of determinations on test samples for a lot over a period of several days, in order to maintain the independence of test results. NOTE 2 The method of determination of any quality characteristi
34、c should remain the same throughout the experiment. 5.3 Replication of experiment Even when a series of experiments has been conducted prior to regular sampling operations, the experiments should be carried out periodically to check for possible changes in quality variation and, at the same time, to
35、 control the precision of sampling, sample preparation and measurement. Because of the amount of work involved, it should be carried out as part of routine sampling, sample preparation and measurement. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy,
36、 (c) BSI ISO 3085:2002(E) 3 5.4 Record of the experiment For future reference and to avoid errors and omissions, it is recommended that detailed records of experiments be kept in a standardized format (see clause 9 and annex A). 6 Method of experiment 6.1 Sampling 6.1.1 Periodic systematic sampling
37、6.1.1.1 The number of increments, n1, shall be determined in accordance with ISO 3082. 6.1.1.2 When 2n1 increments are taken, the sampling intervals, m, in tonnes, shall be calculated by dividing the mass, mL, of the lot by 2n1, i.e. giving intervals equal to one-half of the sampling interval for ro
38、utine sampling. L 1 2 m m n = Alternatively, when the experiment is carried out as part of routine sampling and n1 increments are taken, the sampling interval, m, shall be calculated by dividing the mass, mL, of the lot by n1. L 1 m m n = The sampling intervals thus calculated may be rounded down to
39、 the nearest 10 t. 6.1.1.3 The increments shall be taken at the sampling interval determined in 6.1.1.2, with a random start. 6.1.1.4 The increments shall be placed alternately in two containers. Thus, two gross samples, A and B, will be constituted. EXAMPLE 1 See Figure 1. Suppose that a lot of 19
40、000 t is transferred by belt conveyors and the number of increments determined in accordance with ISO 3082 for routine sampling, n1, is 60. When 2n1 increments are taken, the sampling interval for the experiment, m, is given by the equation L 1 19 000 158150 2602 m m n = Thus, increments are taken a
41、t 150 t intervals. The point for taking the first increment from the first sampling interval of 150 t is determined by a random selection method. If the point for taking the first increments is determined as 20 t from the beginning of handling the lot, subsequent increments should be taken at the po
42、int 20 + im, where i = 1, 2, ., 2n1 (170 t, 320 t and so on). Since the whole lot size is 19 000 t, 126 increments shall be taken. The increments are placed alternately in two containers, and two gross samples, A and B, are constituted, each composed of 63 increments. Licensed Copy: sheffieldun shef
43、fieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3085:2002(E) 4 Key Solid circles indicate increments taken from stratum. Open circles indicate gross samples. Figure 1 Schematic diagram for example 1 6.1.2 Stratified sampling 6.1.2.1 The number of increments, n3, to be
44、 taken from each stratum shall be calculated from the number of strata, n4, forming one lot and the number of increments determined in accordance with ISO 3082, n1, using the equation 1 3 4 n n n = NOTE Examples of strata, based on time, mass or space, include production periods, production masses,
45、holds in vessels, wagons in a train or containers. The number of increments thus calculated shall be rounded up to the next higher whole number if 2n1 increments are taken, or to the next higher whole even number if n1 increments are taken. 6.1.2.2 When 2n1 increments are taken, 2n3 increments shall
46、 be taken from each stratum and shall be separated at random into two partial samples, each of n3 increments. Alternatively, when the experiment is carried out as part of routine sampling and n1 increments are taken, n3 increments shall be taken from each stratum and be separated at random into two
47、partial samples, each of n3/2 increments. 6.1.2.3 The two partial samples from each stratum shall be combined into two gross samples, A and B, respectively. NOTE If the mass varies from stratum to stratum, the number of increments to be taken from each stratum shall be varied in proportion to the ma
48、ss of ore in each stratum. This method is called “proportional stratified sampling”. EXAMPLE 1 See Figure 2. Suppose that a lot is divided in 11 strata each of 60 t and the number of increments, n1, determined for the entire lot (60 11 = 660 t) in accordance with ISO 3082 is 20. Thus, the number of
49、increments to be taken from each stratum is 1 3 4 20 1,82 11 n n n = Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:01:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3085:2002(E) 5 Key Boxes indicate strata. Solid circles indicate increments taken from stratum. Open circles indicate gross samples. Figure 2 Schematic diagram for example 2 When 2n1 increments are taken, four (2n3 = 2 2) increments are taken from each stratum and separated at random into two partial samples, each consisting of two increments. The two partial sam
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