1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58for determination of metal and moisture content ICS 73.060.99Copper, lead, zinc and nickel concentr
2、ates Sampling procedures BRITISH STANDARDBS ISO 12743:2006BS ISO 12743:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2007 BSI 2007ISBN 978 0 580 50464 8Amendments issued since publicationAmd. No. Date Commentscontract. Users ar
3、e responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of ISO 12743:2006. The UK participation in its preparation was entrusted to Technical Co
4、mmittee NFE/36, Copper, lead and zinc ores and concentrates.A list of organizations represented on NFE/36 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a Reference numberISO 12743:2006(E)INTERNATIONAL STANDARD ISO12743Second
5、edition2006-06-15Copper, lead, zinc and nickel concentrates Sampling procedures for determination of metal and moisture content Concentrs de cuivre, de plomb, de zinc et de nickel Procdures dchantillonnage pour la dtermination de la teneur en mtal et de lhumidit BS ISO 12743:2006ii iiiContents Page
6、Foreword vi 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Sampling theory 4 4.1 General. 4 4.2 Total variance 5 4.3 Sampling-stage method of estimating sampling and total variance. 6 4.4 Simplified method of estimating sampling and total variance 9 4.5 Interleaved sample method
7、 of measuring total variance . 10 5 Establishing a sampling scheme 12 6 Mass of increment 17 6.1 General. 17 6.2 Mass of increment for falling-stream samplers. 17 6.3 Mass of increment for cross-belt samplers . 17 6.4 Mass of increment for manual sampling from stationary lots . 18 6.4.1 Primary incr
8、ements 18 6.4.2 Mass of secondary and subsequent increments 18 6.5 Mass of increment for stopped-belt reference sampling 18 7 Methods of sampling from concentrate streams 18 7.1 General. 18 7.2 Mass-basis systematic sampling 18 7.2.1 General. 18 7.2.2 Sampling interval 19 7.2.3 Sample cutter 19 7.2.
9、4 Taking of primary increments . 19 7.2.5 Constitution of subsamples and lot samples 19 7.2.6 Types of division. 20 7.2.7 Division of increments . 20 7.2.8 Division of subsamples 20 7.2.9 Division of lot samples. 20 7.3 Time-basis systematic sampling. 21 7.3.1 General. 21 7.3.2 Sampling interval 21
10、7.3.3 Sample cutter 21 7.3.4 Taking of primary increments . 22 7.3.5 Constitution of subsamples and lot samples 22 7.3.6 Types of division. 22 7.3.7 Division of increments and subsamples 22 7.3.8 Division of lot samples. 22 7.4 Stratified random sampling . 22 7.4.1 Fixed mass intervals. 22 7.4.2 Fix
11、ed time intervals 23 8 Mechanical sampling of concentrate streams. 23 8.1 General. 23 8.2 Design of the sampling system. 23 8.2.1 Safety of operators . 23 8.2.2 Location of sample cutters 23 BS ISO 12743:2006iv 8.2.3 Provision for interleaved sampling . 23 8.2.4 Provision for stratified random sampl
12、ing. 24 8.2.5 Checking precision and bias . 24 8.2.6 Avoiding bias. 24 8.2.7 Minimizing bias . 24 8.2.8 Configuration of the sampling system . 24 8.3 Sample cutters. 24 8.3.1 General . 24 8.3.2 Design criteria . 25 8.3.3 Cutter speed 26 8.4 Mass of increments. 27 8.5 Number of increments 27 8.6 Samp
13、ling interval 27 8.7 Routine checking 27 9 Manual sampling of concentrate streams 28 9.1 General . 28 9.2 Choosing the sampling location 28 9.3 Sampling implements . 28 9.4 Mass of increments. 28 9.5 Number of increments 28 9.6 Sampling interval 28 9.7 Sampling procedures . 29 9.7.1 General . 29 9.7
14、.2 Full stream cut from a falling stream 29 9.7.3 Partial stream cuts from a falling stream . 29 9.7.4 Sampling from moving conveyor belts.30 10 Stopped-belt reference sampling 30 11 Sampling from grabs 31 11.1 General . 31 11.2 Mass of primary increments 31 11.3 Number of primary increments 31 11.4
15、 Method of sampling 31 11.5 Constitution of subsamples and lot samples 31 12 Sampling from trucks, railway wagons and sampling hoppers. 32 12.1 General . 32 12.2 Mass of primary increments 32 12.3 Number of primary increments 32 12.4 Method of sampling 32 12.5 Constitution of subsamples and lot samp
16、les 32 13 Sampling of concentrate in bags or drums 35 13.1 General . 35 13.2 Mass of primary increments 35 13.3 Number of primary increments 35 13.4 Method of sampling 36 13.4.1 General . 36 13.4.2 Sampling during filling or emptying . 36 13.4.3 Spear sampling . 36 13.5 Constitution of subsamples an
17、d lot samples 36 14 Sampling of stockpiles . 37 15 Methods of comminution, mixing and division 37 15.1 General . 37 15.2 Comminution . 37 15.2.1 General . 37 15.2.2 Mills 37 15.3 Mixing. 38 15.3.1 General . 38 BS ISO 12743:2006v15.3.2 Methods of mixing 38 15.4 Division 40 15.4.1 Chemical analysis sa
18、mples . 40 15.4.2 Moisture samples 40 15.4.3 Number of increments for division . 40 15.4.4 Minimum mass of divided sample 40 15.4.5 Rotary sample division. 41 15.4.6 Cutter-type division 42 15.4.7 Manual increment division. 43 15.4.8 Spear division . 43 15.4.9 Fractional shovelling 44 15.4.10 Ribbon
19、 division. 45 15.4.11 Riffle division 47 16 Sample requirements . 49 16.1 Moisture samples 49 16.1.1 Mass of test portion 49 16.1.2 Processing of samples. 49 16.2 Chemical analysis samples . 49 16.3 Physical test samples. 50 17 Packing and marking of samples 50 Annex A (normative) Sampling stage met
20、hod of estimating sampling and total variance 51 Annex B (informative) Estimation of total variance Barge unloading using a grab . 58 Annex C (informative) Mechanical sample cutters . 62 Annex D (informative) Checklist for mechanical sampling systems 67 Annex E (normative) Manual sampling devices 71
21、 Annex F (informative) Apparatus for manual sampling of concentrates from stopped belts 73 Annex G (informative) Sampling of stockpiles 74 Annex H (normative) Increment division scoops for conducting manual increment division 76 Bibliography . 77 BS ISO 12743:2006vi Foreword ISO (the International O
22、rganization 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 subject for which a technical committee has been estab
23、lished 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) on all matters of electrotechnical standardizat
24、ion. 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
25、. 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 p
26、atent rights. ISO 12743 was prepared by Technical Committee ISO/TC 183, Copper, lead, zinc and nickel ores and concentrates. This second edition cancels and replaces the first edition (ISO 12743:1998), which has been technically revised. The principal change is the extension of the scope to cover th
27、e sampling of nickel concentrates. BS ISO 12743:20061Copper, lead, zinc and nickel concentrates Sampling procedures for determination of metal and moisture content WARNING This International Standard may involve hazardous materials, operations and equipment. It is the responsibility of the user of t
28、his 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 copper, lead, zinc and nickel concentrates from moving streams and stati
29、onary 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, it is necessary to
30、 use a common sample for moisture determination and chemical analysis to eliminate bias (see ISO 10251). In such cases, the common sample must be sufficiently representative, i.e. unbiased and sufficiently precise, for chemical analysis and determination of moisture content. Any large agglomerates (
31、 10 mm) present in the primary sample should be crushed prior to further sample processing. Sampling of concentrates in slurry form is specifically excluded from this International Standard. Stopped-belt sampling is the reference method for collecting concentrate samples against which mechanical and
32、 manual-sampling procedures may 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 International
33、Standard, for sampling from stationary lots, only minimize some of the systematic sampling errors. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the lates
34、t edition of the referenced document (including any amendments) applies. ISO 10251, Copper, lead, zinc and nickel concentrates Determination of mass loss of bulk material on drying ISO 12744, Copper, lead, zinc and nickel concentrates Experimental methods for checking the precision of sampling ISO 1
35、3292, Copper, lead, zinc and nickel concentrates Experimental methods for checking the bias of sampling BS ISO 12743:20062 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 representative sample quantity of concentrate representing a larger mas
36、s of concentrate with both precision and bias within acceptable limits 3.2 lot quantity of concentrate to be sampled 3.3 lot sample quantity of concentrate representative of the lot 3.4 sub-lot subdivided parts of a lot which are processed separately, each of them producing a subsample which is anal
37、ysed separately, e.g. for moisture determination 3.5 subsample quantity of concentrate representative of the sub-lot 3.6 sampling sequence of operations aimed at obtaining a sample representative of a lot NOTE It comprises a series of sampling stages, each stage usually comprising operations of sele
38、ction and preparation 3.7 selection operation by which a smaller quantity of concentrate is taken from a larger quantity of concentrate 3.8 increment quantity of concentrate selected by a sampling device in one operation 3.9 increment selection selection process that consists of extracting from the
39、lot, or from an intermediate sample, successive increments which can be combined to constitute a sample 3.10 division operation of decreasing sample mass, without change of particle size, where a representative part of the sample is retained 3.11 constant-mass division method of division in which th
40、e retained portions from individual increments or subsamples are of uniform mass BS ISO 12743:200633.12 proportional division method of division in which the retained portions from individual increments or subsamples are a constant proportion of their original mass 3.13 preparation nonselective oper
41、ation without division such as sample transfer, drying, comminution or homogenization 3.14 sample processing whole sequence of selection and preparation operations which transforms a stage i sample into a test sample 3.15 comminution operation of reducing particle size by crushing, grinding or pulve
42、risation 3.16 stage i sample sample obtained at the ith stage of the sampling scheme 3.17 moisture sample representative quantity of concentrate from which test portions are taken for moisture determination NOTE Alternatively, the whole moisture sample may be dried to determine its moisture content
43、3.18 laboratory sample sample that is processed so that it can be sent to the laboratory and used for further processing and selection of one or more test samples for analysis 3.19 common sample representative quantity of concentrate which is dried to determine its mass loss and subsequently used fo
44、r further processing and selection of one or more test samples for chemical analysis 3.20 test sample representative quantity of concentrate obtained from a laboratory sample when additional preparation, such as drying or hygroscopic moisture determination, is needed prior to the selection of one or
45、 more test portions 3.21 test portion representative quantity of concentrate taken from a moisture sample, a laboratory sample or a test sample which is submitted to moisture determination or analysis in its entirety 3.22 systematic sampling selection of increments in which the concentrate being sam
46、pled is divided into equal strata and the first increment is taken at random within the first stratum, the interval between subsequent increments being equal to the stratum size 3.23 stratified random sampling selection of increments in which the concentrate being sampled is divided into equal strat
47、a, each increment being taken at random within each stratum BS ISO 12743:20064 3.24 homogenisation preparation operation which reduces the distribution heterogeneity of the concentrate 3.25 agglomerate cluster of particles that are held together by chemical or physical phenomena 3.26 nominal top siz
48、e aperture size of a test sieve that retains 5 % of the mass of concentrate 3.27 moisture determination quantitative measurement of the mass loss of the moisture test portion under the conditions of drying specified in ISO 10251 3.28 chemical analysis quantitative determination of the required chemi
49、cal constituents of the analysis test portion 3.29 error in any quantitative measurement, the difference between the true value and the value obtained for an individual measurement 3.30 bias statistically significant difference between the mean of the test results and an accepted reference value See also ISO 13292. 3.31 precision closeness of agreement between independent test results obtained under stipulated conditions See also ISO 12744. 3.32 interleaved samples samples constituted by placing consecutive primary increments al
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