ISO 6140-1991 Aluminium ores preparation of samples《铝土矿石 样品的制备》.pdf

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1、INTERNATIONAL STANDARD IS0 6140 First edition 1991-11-15 Aluminium ores - Preparation of samples Minerais alumineux - PrGparafion des khantillons Reference number IS0 6140:1991(E) Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduc

2、tion or networking permitted without license from IHS-,-,-IS0 6140:1991(E) Cohtents 1 Scope . 1 2 Normative references . 1 3 Definitions 1 4 Fundamentals of sample preparation . 1 5 Precision of sample preparation . 7. 6 Bias in sample preparation . 7 7 Preparation of samples for the determination o

3、f total moisture 7 6 Preparation of samples for chemical analysis . 7 9 Preparation of samples for physical testing 8 10 Packing and labelling of samples . 9 Page Annexes A Sample preparation diagrams 10 B Examples of mechanical mixers . 12 C Mechanical sample dividers . 14 D Manual sampling impleme

4、nts . 20 E Examples of riffles 22 F Particle size reduction equipment 23 0 IS0 1991 All rlghts reserved. No part of this publication may be reproduced or utlllzed In any form or by any means, electronic or mechanical, Including photocopying and microfilm, without permission In wrltlng from the publi

5、sher. internatlonal Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Prlnted in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from I

6、HS-,-,-IS0 6140:1991(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in

7、 a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commi

8、ssion (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75% of the member bodies casting a vote Internati

9、onal Standard IS0 6140 was prepared by Technical Committee ISO/TC 129, Aluminium ores, Sub-Committee SC 1, Sampling. Annex A forms an integral part of this International Standard. Annexes B, C, D, E and F are for information only. Copyright International Organization for Standardization Provided by

10、IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD IS0 6140:1991(E) Aluminium ores - Preparation of samples 1 Scope This International Standard specifies methods of treatment of gross samples and subsamples of alu- mini

11、um ores with a view to the preparation of sam- ples for the determination of moisture, chemical analysis and physical testing. The methods specified are applicable to all alu- minium ores. 2 Normative references The following standards contain provisions which, through reference in this text, consti

12、tute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent edition

13、s of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 565:1990, Test sieves - Melal wire cloth, per- forated metal plate and elecfroformed sheet - Nom- inal sizes of openings. IS0 6138:1991, AIuminium ores - Experimental de- t

14、ermination of fhe heterogeneity of constitution. IS0 8685:-l), Aluminium ores - Sampling pro- cedures. IS0 9033:1989, Aluminium ores - Deferminafion of the moisture content of bulk material. 3 Definitions For the purposes of this International Standard, the following definitions apply. 1) To be publ

15、ished. 3.1 chemical analysis sample: The sample crushed to pass a sieve aperture of 150 j.rm used for the de- termination of chemical characteristics of the ore. 3.2 division: The processPof decreasing the sample mass (without modification of the particle size of the constituent parts) where a repre

16、sentative part of the sample is retained while rejecting the remainder. 3.3 gross sample: The quantity of an ore consisting of all of the increments or divided increments or subsamples or divided subsamples taken from a lot. 3.4 moisture sample: A sample used for the deter- mination of moisture cont

17、ent of the lot or sampling unit. 3.5 nominal top size: The size of aperture of the finest sieve (complying with IS0 565) through which a minimum of 95 y0 of the mass of the material passes. 3.6 pass: The passage of the retained material once through a sample divider. 3.7 reduction: The process where

18、by a sample is reduced in particle size by crushing or grinding without a change in its mass or composition. 3.8 physical testing sample: A sample taken for the measurement of physical characteristics. 3,9 stage: A sequence of operations comprising reduction in particle size, mixing and culminating

19、in sample division. The number of stages in sample preparation is equal to the number of divisions made. 1 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6140:1991(E

20、) 4 Fundamentals of sample preparation 4.1 Introduction Sample preparation involves several distinct oper- ations, which are sometimes preceded by drying. These are as follows: a) reduction: b) mixing - to achieve homogeneity; c) division. These three operations are generally considered to constitut

21、e only one stage of sample preparation. As a general rule, reduction should always precede division. An exception occurs when high capacity streams are being sampled mechanically and it is permissible to divide large primary increments as specified in IS0 8685. The procedures of sample preparation s

22、hould be chosen to minimize errors of sample preparation without having to retain too large a mass. Examples of sample preparation schemes are given in annex A. 4.2 Minimum mass of sample to be retained after divislon The amount of sample to be retained depends upon the nominal top size of the ore a

23、t that stage. The recommended procedure for sample prep- aration should involve two or more stages, and the minimum mass of ore retained after each stage shall not be less than %, where q= -g ( 2 (7 go3 x 1oe where m, c, 4s e g 2 Is the minimum gross sample mass, in kilograms; is the coefficient of

24、variation between particles of the quality characteristic un- der investigation, determined in accord- ance with IS0 6138; is the required sampling error (standard deviation); is the density, in tonnes per cubic metre, of the ore particles (not bulk density); is the size range factor indicated in ta

25、ble 1; D is the nominal top size, in millimetres, of the ore in the lot. Table 1 - Size range factors Size range Value for g Large size range (D/U 4) 0,25 Medium size range (4 D/D 22) 0,50 Small size range (D/D - Motor - . i f/ -I7 (Sk I- l 39; I t t Divided sample Rotating Sample chute IS0 6140:199

26、1(E) Figure C.4 - Rotating chute 17 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6140:1991(E) bc -0 Cutting aperture of primary sampler Main ore flow Increment Tra

27、veling pass of primary sampler Figure C.5 - Diverter chute 18 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6140:1991(E) bc Cutting aperture of primary sampler - Ma

28、in ore flow -0 Increment -o-C Travelling pass of primary sampler Figure C.8 - Bottom dump cutter 19 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6140:1991(E) Annex

29、 D (informative) Manual sampling implements 0.1 Scope This annex describes implements suitable for the manual sampling of aluminium ores from stationary situ- ations. D.2 Scoops A recommended design of scoop is shown in figure D.l with the recommended dimensions given in table D.I. Scoops are not su

30、itable for sampling ore with a nominal top size larger than about 45 mm. Figure D.1 - Scoop Table D-1 - Recommended sizes of scoops Recommended Nominal top size Nominal mass of dimensions of ore increment mm mm 11,2 16,0 22,4 31,5 45,0 11,2 16,0 22,4 31,5 45,0 kg 0,14 0,40 I,10 3,00 8,70 I b h 0,14

31、0,40 I,10 3,00 8,70 75 35 30 -I 110 50 40 170 70 50 220 95 80 300 135 120 I b h 75 35 30 110 50 40 170 70 50 220 95 80 300 135 120 20 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license f

32、rom IHS-,-,-IS0 6140:1991(E) D.3 Shovels A recommended design of shovel is shown in figure D.2 with the recommended dimensions given in table D.2. Shovels are not suitable for sampling ore with a nominal top size larger than about 45 mm. Figure D.2 - Shovels Table D-2 - Recommended sizes of shovels

33、Nominal top size Nominal mass of of ore increment mm kg 11,2 0,14 16,0 0,40 22,4 1,lO 31,5 3,00 450 8.70 Recommended dimensions mm h 30 40 50 80 120 21 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted

34、 without license from IHS-,-,-IS0 6140:1991(E) Annex E (informative) Examples of riffles Figure E.1 - Riffles 22 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 6140:

35、1991 (E) Annex F (informative) Particle size reduction equipment Blake pattern jaw crusher Figure F.1 - Jaw crusher Double roll crusher with spring-loaded roller Figure F-2 - Roll crusher 23 Copyright International Organization for Standardization Provided by IHS under license with ISONot for Resale

36、No reproduction or networking permitted without license from IHS-,-,-IS0 6140:1991(E) A-A Showing plate detail Fixed plate Discharge .- Rotating grinding B-B Figure F.3 - Plate mill Top view of rings Rings -, r Lid Toggle clamp Vibrating table NOTE - Ore is placed in the spaces between the loose rin

37、gs, wall and centre disc. Milling is induced by a vibrating table on which the milling chamber is clamped. Figure F.4 - Ring mill 24 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license fr

38、om IHS-,-,-IS0 6140:1991(E) UDC 553.492:620.11 Descriptors: minerals and ores, alumlnium ores, sampllng, test specimens, specimen preparation. Price based on 24 pages Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-