1、BRITISH STANDARD BS 1016-110.2: 1996 ISO 2325:1986 Methods for Analysis and testing of coal and coke Part 110: Size analysis of coke Section 110.2 Nominal top size 20mm or less ICS:75.160.10 UDC 662.749.2:620.168.32BS1016-110.2:1996 This British Standard, having been prepared under the directionof t
2、he Sector Board for Materials and Chemicals, was published under the authority ofthe Standards Board and comesinto effect on 15 May 1996 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference SFI/3 Draft announced in BSI News January 1996 ISBN 0 580 25525 5
3、 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee SFI/3, Analysis and testing of coal and coke, upon which the following bodies were represented: British Cement Association British Coal Corporation British Gas plc British
4、Steel Industry Electricity Association GAMBICA (BEAMA Ltd.) Power Generation Contractors Association PGCA (BEAMA Ltd.) Amendments issued since publication Amd. No. Date CommentsBS1016-110.2:1996 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and fi
5、eld of application 1 2 References 1 3 Principle 1 4 Apparatus 1 5 Sample 1 6 Procedure 2 7 Expression of results 2 8 Test report 3 List of references Inside back coverBS1016-110.2:1996 ii BSI 07-1999 National foreword This British Standard has been prepared by SFI/3 and is identical to ISO2325:1986
6、Coke Size analysis (Nominal top size20mm or less), published by the International Organization for Standardization (ISO) and in the preparation of which the United Kingdom played a full part. In conjunction with BS 1016-110.1 this British Standard is a revision of BS1016-18:1981 which is withdrawn.
7、The main changes in this revision are the separation of the methods for “small” and “large” coke, and a more precise description of the sieving procedure. BS 1016-110.2 is part of a rationalized and restructured BS1016. The Parts numbered from 1 to 21 are gradually being withdrawn and replaced by Pa
8、rts in the new series. The full list of Parts in the new series, together with corresponding numbering of the old series and related ISO standards is given in BS1016 Analysis and testing of coal and coke Part100:1994 General introduction and methods for reporting results. The Technical Committee has
9、 reviewed the provisions of ISO565, ISO2309, and ISO3310 to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard related to ISO2309:1980 is BS1017 Sampling of coal and coke Part2:1994Methods for sampling of coke.
10、ISO2309 is being revised in conjunction with ISO1988 Hard coal Sampling, ISO9411Solid mineral fuels Mechanical sampling from moving streams Part1:Coal and Part2:Coke. This revision will be published in eight Parts, and it is intended to implement these Parts as identical British Standards, supersedi
11、ng BS1017. A British Started related to ISO3310-1 and ISO3310-2 is BS410:1986 Specification for test sieves. 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
12、Standard does not of itself confer immunity from legal obligations. Cross-references International standard Corresponding British Standard ISO 579:1981 BS 1016 Methods for analysis and testing of coal and coke Part 2:1973 Total moisture of coke (Technically equivalent) ISO 1953:1994 Part 109:1995 Si
13、ze analysis of coal (Identical) ISO 2591 a BS 1796 Test sieving (Identical) a ISO 2591:1973 has been superseded by ISO 2591-1:1988. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has be
14、en updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS 1016-110.2:1996 BSI 07-1999 1 1 Scope and field of application This International Standard specifies a method of determining the particle size distribu
15、tion of a sample of coke having a nominal top size of20mm or less. Two methods of operation are described: a) where a restricted size analysis is required, using two sieves only; b) where a complete size analysis is required. 2 References ISO 565, Test sieves Woven metal wire cloth, perforated plate
16、 and electroformed sheet Nominal sizes of openings. ISO 579, Coke Determination of total moisture. ISO 1953, Hard coals Size analysis. ISO 2309, Coke Sampling. ISO 2591, Test sieving. ISO 3310, Test sieves Technical requirements and testing Part1:Test sieves of metal wire cloth Part2:Test sieves of
17、metal perforated plate. 3 Principle A sample of coke is subjected to a process of size analysis by a specified procedure, and the results are expressed in terms of the cumulative percentage by mass of the coke remaining on sieves of different sized openings. 4 Apparatus 4.1 Perforated plate sieves,o
18、f round opening size respectively20mm and10mm. 4.2 Wire cloth test sieves, of the following opening sizes: 16, 8, 4, 2 and 1mm; 500, 250, 125 and 63 4m. These sieves are conveniently shaken by means of an appropriate mechanical shaking machine. The sieves (4.1 and4.2) shall comply, when selected and
19、 during use, with ISO565, ISO3310-1 and ISO3310-2. 4.3 Lightweight containers, of metal or plastic material, for the sample and the fractions sieved from it. The largest container shall be capable of holding20kg of sample. 4.4 Weighing machines, suitable for weighing a mass of up to30kg, such that t
20、he weighing error does not exceed0,1% of the maximum mass of sample or10g, whichever is the smaller. 5 Sample The sample shall be representative of the coke and shall be taken as specified in ISO2309. For coke containing appreciable quantities (over20%) above10mm, the mass of the sample shall be20kg
21、 and the whole of this sample shall be used for size analysis. For samples where the nominal top size is2,8mm or less, the mass of sample used for size analysis shall be not less than0,3kg and preferably not more than0,5kg. This quantity shall be taken from the primary sample using one of the follow
22、ing methods of sample division: cone divider; riffle splitter; coning and quartering. Intermediate masses for the test sample shall be taken according to the nominal top size of the coke.BS 1016-110.2:1996 2 BSI 07-1999 6 Procedure 6.1 Restricted size analysis on two sieves Before commencing the tes
23、t, dry the coke sample at a temperature of200 C (seeISO579). Weigh the sample to the nearest 10g. Place the two sieves(4.1) or two of the sieves(4.2) one above the other in a suitable frame, with the sieve of larger opening size uppermost. Place the receiving tray below the sieve of smaller opening.
24、 Transfer a quantity of the dry coke to the upper sieve, such that it is not choked by the coke. In general, this will mean that not more than75% of the sieve is covered by the coke. Shake the sieve by hand (see the note) until no more coke passes through the openings. Remove the top sieve, transfer
25、 the oversize to a container of known mass, and carry out the same procedure with the coke remaining on the lower sieve. Replace the empty sieves in the frame. Repeat the process until the whole sample has been treated in this manner, transferring the coke to the appropriate containers after each op
26、eration. Weigh each container with its contents to the nearest10g and calculate the total mass of coke which remains on each sieve after the sieving operations. Transfer the coke which has passed through the lower sieve into the tray to a container of known mass, and weigh. NOTEMechanical shaking ma
27、y be used, provided that its action does not break the coke and that the results are known to be not biased with respect to the results obtained by hand shaking. 6.2 Complete size analysis (using a mechanical sieving machine) NOTEWhere a mechanical sieving machine is not available, the procedure spe
28、cified in ISO1953 should be adopted. Before commencing the test, dry the coke sample at a temperature of200 C (see ISO579). Weigh the sample to an accuracy of0,1% It will probably be advisable to carry out the size analysis in two stages if a complete range of openings is to be covered, namely: usin
29、g sieves with16, 8, 4, 2 and1mm openings; using sieves with 500, 250, 125 and634m openings. The diameter of the sieves having openings of 1mm or more will generally be larger than that of sieves with smaller openings. When transferring from larger to smaller diameter sieves, it may be necessary to r
30、educe the mass of material to a known proportion and to sieve this known reduced mass on the smaller diameter sieves, repeating the same sieving procedure (see ISO2591). Assemble the appropriate sieves in a nest in descending order of size, and fit the receiver. Transfer the sample to the top sieve,
31、 fit the lid, and shake the nest of sieves for5min. At the end of this period, clean each sieve in turn, starting with the coarsest mesh sieve, by inverting it over a paper or tray, tapping the side and carefully brushing the uppermost surface of the sieve. Add any loose particles dislodged during b
32、rushing to the oversize on the tray or on the paper. Replace the sieve in the nest, and transfer the material in the tray or on the paper back to the sieve. Repeat the process of sieving for5min, transfer the oversize from each sieve to a container of known mass, adding any material dislodged by bru
33、shing, and determine the mass of each fraction. 7 Expression of results 7.1 Calculation Record the mass of each size fraction. Calculate the cumulative mass on each sieve, starting with the sieve of largest opening. The apparent loss, i.e.the difference between the total mass of the sample before an
34、d after the size analysis, shall be recorded. Loss in mass means loss of sample, and should not occur. If the loss is not more than1% of the original sample mass, it shall be added to the mass of the fraction of smallest size. If the loss is greater than1% of the original sample mass, the results of
35、 the size analysis shall be rejected. Convert each cumulative mass to a percentage of the total mass.BS 1016-110.2:1996 BSI 07-1999 3 If the sample of coke has been sub-divided during the size analysis, the results obtained on the sub-samples shall be multiplied by the ratio of the respective masses
36、 in order to relate these results to the original sample of coke. The results shall be reported to the nearest10g and0,1%(m/m). For all methods of sieving, the arithmetic mean size may be calculated, using the results of the size analysis of the coke in the following way: the symbols being allocated
37、 so that A=0%(m/m) and K=100%(m/m) (i.e.k =0mm). Then NOTE 1This formula is greatly simplified when a sieve series of constant intarval is used. It is essential that the openings of the sieves in any series be all round or all square. If openings of 1mm and above are sufficient for the size analysis
38、, a series with either round or square openings may be used. If openings smaller than 1mm are necessary, only a series of woven wire sieves with square openings shall be used. NOTE 2Alternative methods of calculation, or graphical methods, may lead to slightly different results; therefore, when comp
39、aring test results from different samples, it is important to adhere to the same method of calculation. 7.2 Precision of the method 7.2.1 Repeatability The results of duplicate determinations of size analysis carried out at different times in the same laboratory, by the same operator, with the same
40、apparatus on samples obtained by taking alternate increments from the same consignment of coke, shall not differ by more than the tolerances given in the table below. The precision is expressed in the table in terms of standard deviation and 95 % confidence limits of a single determination, together
41、 with an indication of the tolerance limit of duplicate determinations. 7.2.2 Reproducibility No tolerance is quoted for determinations carried out in different laboratories because the transport of a coke sample involves the risk of breakage and thus alteration of the size distribution. 8 Test repo
42、rt The test report shall include the following particulars: a) the identification of the product tested; b) the reference of the method used; c) the results and the method of expression used; d) the date of test; e) any operation not included in this International Standard or in the International St
43、andards to which reference is made, or regarded as optional. sieve openings: a, b, c, d, ., h, j, k cumulative percentages: A, B, C, D, ., H, J, K Cumulative percentagemass retained on sieve 95 Standard deviation 1,75 2,00 2,25 2,50 2,25 2,00 1,75 1,50 1,25 0,75 0,50 95 % limits 3,5 4,0 4,5 5,0 4,5
44、4,0 3,5 3,0 2,5 1,5 1,0 Tolerance 4,9 5,6 6,3 7,0 6,3 5,6 4,9 4,2 3,5 2,1 1,4 mean size 1 100 - = Bac ()Cbd ().Jhk ()100 j + 4 blankBS1016-110.2:1996 BSI 07-1999 List of references See national foreword.BS 1016-110.2: 1996 ISO 2325:1986 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsIns
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