1、BRITISH STANDARD BS ISO 10086-2:2004 Coal Methods for evaluating flocculants for use in coal preparation Part 2: Flocculants as filter aids in rotary vacuum filtration systems ICS 73.040 BS ISO 10086-2:2004 This British Standard was published under the authority of the Standards Policy and Strategy
2、Committee on 20 January 2004 BSI 20 January 2004 ISBN 0 580 43297 1 National foreword This British Standard reproduces verbatim ISO 10086-2:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PTI/16, Solid mineral fuels, wh
3、ich has the responsibility 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 Catalogue under the section entitle
4、d “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance w
5、ith a British 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 intern
6、ational and European 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 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when
7、 the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 10086-2:2004(E)NINRETOITALAN ADNATSDR OSI 168002- tide tsriFino -400251-10 Coal Methods for evaluating flocculants for use in coal preparation Part 2: Flocculants as filter aids in rotary v
8、acuum filtration systems Charbon Mthodes dvaluation des floculants utiliss dans la prparation des charbons Partie 2: Floculants comme aides la filtration dans des systmes rotatoires de filtration sous vide Referecne unbmer OSI -6800102:2)E(40INTERNATIONAL STANDARD ISO 10086-2 First edition 2004-01-1
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10、ed ifrtlitas noosu vied BSISO100862:2004 ii BSISO100862:2004 iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Principle . 1 4 Apparatus. 1 5 Materials. 2 5.1 Slurry 2 5.2 Water 2 6 Sampling 2 7 Preparation of flocculant solutions. 3 8 Test procedure 3 8.1 Preliminary. 3 8.2 Proced
11、ure. 4 8.3 Calculation of flocculant dosage rate . 5 8.4 Filtration test . 6 8.5 Analysis of cake sample. 7 9 Clarity of the filtrate 7 10 Recording of results . 8 11 Repeatability 8 12 Test report 8 Annex A (informative) Worked example. 9 Annex B (informative) Data recording sheet 11 Bibliography .
12、 12 BSISO100862:2004iv 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 committees. Each member body interested in
13、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 International Electrotechnical Commissi
14、on (IEC) on all matters of electrotechnical standardization. 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 c
15、ommittees 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 document may be the subject of patent rights. ISO shall n
16、ot be held responsible for identifying any or all such patent rights. ISO 10086-2 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 1, Coal preparation: Terminology and performance. ISO 10086 consists of the following parts, under the general title Coal Methods for
17、evaluating flocculants for use in coal preparation: Part 1: Basic parameters Part 2: Flocculants as filter aids in rotary vacuum filtration systems BSISO100862:2004INTENRATIONAL TSANDADR IS-68001 O2:(4002E)1Coal Methods for evaluating flocculants for use in coal preparation Part 2: Flocculants as fi
18、lter aids in rotary vacuum filtration systems 1 Scope This part of ISO 10086 specifies a method for the comparative evaluation of the performance of flocculants used as filter aids for rotary vacuum filtration applications on a given slurry. 2 Normative references The following referenced documents
19、are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 10086-1:2000, Coal Methods for evaluating flocculants for use in coal preparatio
20、n Part 1: Basic parameters 3 Principle The performance of different flocculants on a given slurry is determined by measuring the cake yield and moisture content. A flocculant solution is added to an aliquot of slurry in a beaker. A filter leaf is then applied to the flocculated sample and the cake t
21、hus produced on the apparatus is weighed wet, dried and reweighed. A measure of the efficiency of the flocculant is obtained from the cake yield and moisture content. 4 Apparatus Ordinary laboratory apparatus and the following. NOTE The apparatus is generally arranged as shown in Figure 1. 4.1 Labor
22、atory vacuum pump or piped vacuum system, capable of producing a vacuum better than that proposed for the plant equipment. 4.2 Vacuum gauge 4.3 Two-way valves, of at least 2 mm to 3 mm bore, manufactured in glass or plastics. 4.4 Buchner flask, with a minimum volume of 1 L. BSISO100862:20042 4.5 Fil
23、ter-leaf apparatus, consisting of a drainage plate and filter cloth in an assembly, as shown in Figure 4. 4.6 Vacuum tubing and glass/plastics tubing 4.7 Stirrers, motorized variable-speed stirrers, capable of speeds up to 1 000 r/min, one for flocculant preparation and one for sample homogenization
24、. 4.8 Syringes, having capacities of 1 ml, 2 ml, 5 ml, 10 ml and 50 ml. Key 1 vacuum pump/source 5 two-way valve 2 vacuum gauge 6 filter leaf 3 two-way valve 7 slurry in 800 mL beaker 4 buchner flask 8 vacuum tubing Figure 1 Laboratory vacuum filter-leaf apparatus 5 Materials 5.1 Slurry The slurry f
25、or evaluation shall be collected and divided by the method described in ISO 10086-1. The contents of each test cylinder shall then be poured into an 800 ml beaker for evaluation. 5.2 Water The water used for the preparation of flocculant solutions shall be collected by the method described in ISO 10
26、086-1. 6 Sampling The flocculant samples should be collected according to the recommendations described in ISO 10086-1. BSISO100862:2004 37 Preparation of flocculant solutions The flocculant, both powder and liquid grades, shall be prepared in accordance with the methods specified in ISO 10086-1. 8
27、Test procedure 8.1 Preliminary The test procedure shall simulate the operating conditions of a rotary vacuum filter on a plant (see Figures 2 and 3). Where the slurry is taken from a plant using such equipment, the immersion and drying times in the test procedure shall be the same as on the plant eq
28、uipment. Where these times are not known, or where no vacuum filtration system exists, the following times shall apply: immersion time: 1 min 10 s; drying time: 2 min. Key 1 filter bowl 2 filter drum 3 filter cloth 4 filter cake 5 filter cake aFilter leaf. bSlurry in 800 mL beaker. cVacuum tubing. F
29、igure 2 Diagram to show the immersion, drying and discharge sequences of a rotary vacuum drum filter BSISO100862:20044 Key 1 filter cake discharge chute 2 filter bowl 3 disk filter 4 filter cake 5 cake discharge aImmersion. bDrying. cDischarge. Figure 3 Diagram to show the immersion, drying and disc
30、harge sequences of a rotary vacuum disc filter 8.2 Procedure Prepare a 500 ml subsample of the slurry as described in ISO 10086-1. Place one subsample in an 800 ml beaker and homogenize the slurry for 1 min using the laboratory stirrer at a speed sufficient to create a vortex. Using a syringe, add t
31、he desired quantity of flocculant solution (see 8.3) to the surface of the slurry in the beaker and mix well by stirring until completely conditioned. Record the conditioning time. Excessive mixing should be avoided, to prevent degradation of the flocculant. BSISO100862:2004 58.3 Calculation of floc
32、culant dosage rate 8.3.1 Calculation of content of the flocculant solution Mass of water in the beaker = m WMass of flocculant dissolved in the water = m FTherefore, the content of the flocculant solution w Fis given by: F F W , m w m = in grams of flocculant per gram of water For the purpose of thi
33、s calculation, it is assumed that a volume of 1 ml of flocculant solution weighs 1 g. 8.3.2 Calculation of the quantity of solids in the test cylinder Volume of slurry suspension used in the test cylinder (V S ) = 500 ml (= 0,5 L) Solids concentration in the slurry, in g L 1(c S ) = c S(g L 1 ) Ther
34、efore, the mass of the solids in 500 ml of slurry = 0,5 c S(g) = 0,5 10 3c Skg of dry solids 8.3.3 Calculation of flocculant dosage rate Volume of flocculant solution used to dose a slurry suspension in the cylinder = V Fml = V Fg The mass of the flocculant used in the test cylinder = F F W m V m g
35、NOTE It is approximated that 1 ml of flocculant weighs 1 g. The flocculant dosage rate is given by: Mass of flocculant used : Mass of solids in the cylinder 3 F FS W :0,5 10 m Vc m = FF WS 2 000 mV mc = g of flocculant per kg of dry solids The units of the dosage rate may also be expressed as “kg of
36、 flocculant per tonne of dry solids”. BSISO100862:20046 8.3.4 Worked example Mass of water (m W ) = 201,2 g Mass of flocculant (m F ) = 0,23 g Solids concentration in the slurry (c S ) = 50,6 g per litre Volume of slurry used in the test = 500 ml Volume of flocculant solution used (V F ) = 3,0 ml Th
37、erefore, the flocculant dosage rate = FF WS 2 000 mV mc = 2 000 0,23 3,0 201,2 50,6 = 0,136 g of flocculant per kg of dry solids (or 0,136 kg of flocculant per tonne of dry solids, or 136 g of flocculant per tonne of dry solids) The procedure is repeated for other volumes of flocculant solution (V F
38、 ) used. 8.4 Filtration test With reference to Figure 1, switch on the vacuum supply, close one two-way valve (5) and adjust the other two-way valve (3) to give the desired level of vacuum for the test. Insert the filter leaf (see Figure 4) with the appropriate filter cloth into the flocculated susp
39、ension and start the stop watch. At the same time, fully open the two-way valve (5). During the period of time that the filter leaf is immersed in the flocculated suspension (1 min 10 s or as per plant conditions), gently move the filter leaf up and down to maintain the flocculated pulp in suspensio
40、n. After the completion of the immersion time, remove the filter leaf from the flocculated suspension. Commence the drying time (2 min or plant time) with the filter leaf facing downwards. After half the drying time has elapsed, invert the filter leaf to face upwards for the remainder of the drying
41、period. After completion of the drying period, close one two-way valve (5) and vent the other two-way valve (3) to the atmosphere. BSISO100862:2004 7Key 1 filter leaf head 2 filtrate drainage plate 3 filter cloth 4 head to be placed in the slurry aTo vacuum pump/source. Figure 4 Exploded section of
42、the filter leaf 8.5 Analysis of cake sample Measure the thickness d, in millimetres, of the cake on the filter leaf at least three times across the diameter of the cake by inserting a millimetre-graduated steel ruler through the cake until it reaches the filter cloth. The cake thickness can be read
43、from the lowest graduations visible on the steel ruler. Remove the cake sample produced on the surface of the filter medium on the filter leaf and transfer to a pre- weighed Petri dish for weighing to determine the wet cake yield (wet cake mass = m wet g). Place the Petri dish and sample in an oven
44、at 105 C until the mass of cake has decreased to a constant value, i.e. the cake has been dried (dry cake mass = m dry g). 9 Clarity of the filtrate Immediately after the cake thickness has been measured and the whole cake weighed, the clarity of the filtrate is evaluated according to ISO 100861. A
45、turbidity-measuring instrument can also be employed for the evaluation of the clarity of filtrate. BSISO100862:20048 10 Recording of results Record the results for the cake yield on a data sheet (see Table B.1.). The characteristics of the slurry and filtrate shall also be recorded on this sheet. Pl
46、ot the cake yield (mass of dry solids produced) as a function of flocculant dosage for each flocculant, as illustrated in Figure A.1. Plot the cake moisture content as a function of flocculant dosage for each flocculant, as illustrated in Figure A.1. 11 Repeatability Duplicate results of tests shoul
47、d not differ by more than 1,0 % cake moisture and 1 mm cake thickness. 12 Test report The test report shall include the following information: a) date on which the test was carried out; b) description of the flocculant under test; c) details of slurry used; d) reference to this part of ISO 10086; e)
48、 the cake yield; f) the clarity of the filtrate; g) the cake moisture content; h) the filter and dosage rate; i) the vacuum used and the vacuum rate; j) the filter cloth used; k) the stirring time of the slurry after adding the flocculant. l) the immersion time; m) the drying time. BSISO100862:2004
49、9Annex A (informative) Worked example A test was performed on a slurry with a commercial flocculant at a dosage of Y mg of flocculant per litre of slurry. The test procedure was carried out according to this part of ISO 10086 using fixed immersion and drying times of 1 min 10 s and 2 min, respectively. A.1 Calculation Mass of wet cake produced = m wg Mass of cake after drying = m dg Ther
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