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1、BRITISH STANDARD BS ISO 20904:2006 Hard coal Sampling of slurries ICS 73.040 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20904:2006 This British Standard was published under the authority of the Standards Policy and Strategy Com
2、mittee on 30 November 2006 BSI 2006 ISBN 0 580 49617 1 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 20904:2006. The UK participation in its preparation was entrusted to Technical Committee PTI/16, Solid mineral fuels. A list of organizations repres
3、ented on PTI/16 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued
4、 since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 20904:2006(E) INTERNATIONAL STANDARD ISO 20904 First edition 2006-10-01 Hard coal Sampling of slurries Houille chantillonnage des s
5、chlamms BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Contents Page Foreword. v 1 Scope . 1 2 Normative ref
6、erences. 1 3 Definitions . 1 4 Principles of sampling slurries . 2 4.1 General. 2 4.2 Sampling errors 3 4.3 Sampling and overall variance 6 5 Sampling schemes . 7 6 Minimization of bias and unbiased increment mass. 13 6.1 Minimizing bias. 13 6.2 Volume of increment for falling stream samplers to avo
7、id bias 14 6.3 Volume of increment for manual sampling to avoid bias. 14 7 Precision of sampling and determination of increment variance 15 7.1 Overall precision. 15 7.2 Primary increment variance. 15 7.3 Preparation and testing variance 16 8 Number of sub-lots and number of increments per sub-lot.
8、16 9 Minimum mass of solids in lot and sub-lot samples 17 9.1 General. 17 9.2 Minimum mass of solids in lot samples. 17 9.3 Minimum mass of solids in sub-lot samples . 17 9.4 Minimum mass of solids in lot and sub-lot samples after size reduction 17 10 Time-basis sampling 18 10.1 General. 18 10.2 Sam
9、pling interval 18 10.3 Cutters . 18 10.4 Taking of increments 18 10.5 Constitution of lot or sub-lot samples 19 10.6 Division of increments and sub-lot samples . 19 10.7 Division of lot samples. 19 10.8 Number of cuts for division. 19 11 Stratified random sampling within fixed time intervals 19 12 M
10、echanical sampling from moving streams 20 12.1 General. 20 12.2 Design of the sampling system. 20 12.3 Slurry sample cutters. 22 12.4 Mass of solids in increments. 23 12.5 Number of primary increments . 23 12.6 Routine checking 23 13 Manual sampling from moving streams. 23 13.1 General. 23 13.2 Choo
11、sing the sampling location. 23 13.3 Sampling implements. 24 13.4 Mass of solids in increments. 24 13.5 Number of primary increments . 24 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv 13.6 Sampling procedures .25 14 Sam
12、pling of stationary slurries .25 15 Sample preparation procedures25 15.1 General.25 15.2 Reduction mills .25 15.3 Sample division.25 15.4 Chemical analysis samples25 15.5 Physical test samples.26 16 Packing and marking of samples26 Annex A (informative) Examples of correct slurry devices27 Annex B (
13、informative) Examples of incorrect slurry sampling devices30 Annex C (normative) Manual sampling implements.34 Bibliography .35 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Foreword ISO (the International Organization
14、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 established has t
15、he 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 standardization. Interna
16、tional 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. Publicatio
17、n 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
18、. ISO 20904 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 4, Sampling. BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46
19、:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Hard coal Sampling of slurries 1 Scope This International Standard sets out the basic methods for sampling fine coal, coal rejects or tailings of nominal top size 20 Hz) ball mills shall not be used. The particle size of the output is influenced by th
20、e hardness of the coal, but the effect depends on the speed range. 15.3 Sample division After drying and particle size reduction (if necessary), division of lot and sub-lot samples shall be carried out in accordance with the requirements of ISO 13909-4 and the minimum sample mass requirements of Cla
21、use 9. Suitable dividers include rotary sample dividers and riffle dividers. 15.4 Chemical analysis samples Laboratory samples of typically 60 g to 300 g at 212 m nominal top size are extracted from lot and sub-lot samples for chemical analysis depending on the analysis requirements. BS ISO 20904:20
22、06 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 26 15.5 Physical test samples Laboratory samples for physical testing include samples for determination of size distribution and relative density. The samples should be prepared as specified
23、 in the applicable test procedure. 16 Packing and marking of samples Samples for further preparation and/or analysis should be placed in airtight containers, with relevant information shown on the label and on a card placed in the container. The following are examples of such information: a) identif
24、ication of the lot, e.g. shift; b) identification of sampler; c) type, quality and nominal top size of the solids content of the slurry; d) time duration of the lot or sub-lot; e) sample number or portion of the lot or sub-lot the sample represents; f) place and date of sampling; g) method of sampli
25、ng, e.g. mechanical or manual; h) any special purpose or test for which the sample is taken. BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 27 Annex A (informative) Examples of correct slurry devices Key 1 falling stream 2
26、 stream 3 increment a Hose trajectory. Figure A.1 Illustration of a correctly designed hose-type slurry cutter6 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 28 Key 1 stream 2 rotating axis 3 increment a Cutter trajectory
27、. Figure A.2 Correct layout of a circular path falling steam cutter, i.e. a vezin cutter6 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 29 Key 1 stream 2 increment Figure A.3 Illustration of a correctly designed falling s
28、team slurry cutter6 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 30 Annex B (informative) Examples of incorrect slurry sampling devices a) Three examples of tubular probes that always introduce a delimitation error b) Ho
29、mogenization of the stream with baffles positioned prior to a sampling probe (their effectiveness is questionable) Key 1 stream 2 sample 3 slot Figure B.1 In-steam probes Examples of incorrect sampling devices6 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:
30、00 2006, Uncontrolled Copy, (c) BSI 31 a) In-stream point sampling (always incorrect) b) By-line slurry sampling (always incorrect) Key 1 sample point 2 stream 3 increment 4 missing portion of the increment Figure B.2 Incorrect sample delimitation using an in-steam probe and by-line sampling6 BS ISO
31、 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 32 Key 1 stream 2 sample NOTE Increment delimitation and extraction correctness are questionable for liquids and non-existent for slurries6. Figure B.3 Illustration of a sampling sy
32、stem using a header tank BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 33 Key 1 on-stream idle, position 1 2 increment idle, position 2 3 falling stream 4 increment 5 missing portion of the increment Figure B.4 Flexible h
33、ose slurry sampler (always incorrect6) BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 34 Annex C (normative) Manual sampling implements a To exceed the depth of the falling stream. Figure C.1 Example of a manual sample cut
34、ter Figure C.2 Example of a ladle BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 35 Bibliography 1 ISO 13909-2, Hard coal and coke Mechanical sampling Part 2: Coal Sampling from moving streams 2 ISO 13909-3, Hard coal and
35、coke Mechanical sampling Part 3: Coal Sampling from stationary lots 3 ISO 13909-7, Hard coal and coke Mechanical sampling Part 7: Methods for determining the precision of sampling, sample preparation and testing 4 ISO 18283, Hard coal and coke Manual sampling 5 GY, P. 1982, Sampling of Particulate M
36、aterials Theory and Practice, 2nd Edition, Elsevier, Amsterdam 6 PITARD, F.F. 1993. Pierre Gys Sampling Theory and Sampling Practice, 2nd Edition, CRC Press, Boca Raton, USA 6 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
37、 BS ISO 20904:2006 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revision
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