1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12905:2012Products used for treatmentof water intended for humanconsumption ExpandedaluminosilicateBS EN 12905:2012 BRITISH STANDARDNational forewordThis British Standard i
2、s the UK implementation of EN 12905:2012. Itsupersedes BS EN 12905:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can beobtained on request to its
3、 secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 77569 7ICS 71.100.80Compliance with a British Standard can
4、not confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2012.Amendments issued since publicationDate Text affectedBS EN 12905:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12905 October
5、2012 ICS 71.100.80 Supersedes EN 12905:2005English Version Products used for treatment of water intended for human consumption - Expanded aluminosilicate Produits utiliss pour le traitement de leau destine la consommation humaine - Aluminosilicate expans Produkte zur Aufbereitung von Wasser fr den m
6、enschlichen Gebrauch - Expandierte Aluminiumsilikate This European Standard was approved by CEN on 9 September 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without an
7、y alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other langua
8、ge made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark,
9、 Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR
10、 STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12905:2012: EBS EN 12905:2012EN 12905:2012 (E)
11、 2 Contents Page Foreword . 3Introduction 41 Scope 52 Normative references 53 Terms, definitions and symbols 54 Description . 55 Physical properties . 56 Chemical properties 67 Test methods . 78 Labelling, transportation and storage . 7Annex A (informative) General information on expanded aluminosil
12、icate 9Bibliography . 12 BS EN 12905:2012EN 12905:2012 (E) 3 Foreword This document (EN 12905:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by public
13、ation of an identical text or by endorsement, at the latest by April 2013, and conflicting national standards shall be withdrawn at the latest by April 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall
14、 not be held responsible for identifying any or all such patent rights. This document supersedes EN 12905:2005. The significant technical difference between this edition and EN 12905:2005 is as follows: Updating of 8.2 in line with current legislation. According to the CEN/CENELEC Internal Regulatio
15、ns, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
16、 Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12905:2012EN 12905:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human co
17、nsumption caused by the product covered by this European Standard: a) this European Standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) it should be noted that, while awaiting the adoption of verifiable European
18、 criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. NOTE Conformity with this European Standard does not confer or imply acceptance or approval of the product in any of the Member States of the EU or EFTA. The use of the product cov
19、ered by this European Standard is subject to regulation or control by National Authorities. BS EN 12905:2012EN 12905:2012 (E) 5 1 Scope This European Standard is applicable to expanded aluminosilicate used for treatment of water intended for human consumption. It describes the characteristics of and
20、 specifies the requirements and the corresponding test methods for expanded aluminosilicate. It gives information on its use in water treatment. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application.
21、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12901:1999, Products used for treatment of water intended for human consumption Inorganic supporting and filtering materials Definitions
22、 EN 12902, Products used for treatment of water intended for human consumption Inorganic supporting and filtering materials Methods of test 3 Terms, definitions and symbols For the purposes of this document, the terms, definitions and symbols given in EN 12901:1999 apply. 4 Description 4.1 Identific
23、ation 4.1.1 Chemical name Aluminosilicate (AlxSiyOz). 4.1.2 Synonym or common names Expanded clay, expanded slate. 4.2 Commercial forms Expanded aluminosilicate according to this European Standard is available in different particle size ranges. 5 Physical properties 5.1 Appearance Grey-brown to red-
24、brown coloured granular material. Spherical or angular shape, crystalline structure, smooth or rough texture. The product shall be generally homogeneous and shall be visibly free of extraneous matter. BS EN 12905:2012EN 12905:2012 (E) 6 5.2 Particle size distribution The particle size distribution s
25、hall be determined on samples taken at the point of manufacture using the method of test given in EN 12902. NOTE 1 The particle size can decrease during transportation and handling. The particle size distribution shall be described by either: a) effective size: (d10) with a maximum deviation of 5 %;
26、 uniformity coefficient: (U) which shall be less than 1,5; minimum size: (d1) with a maximum deviation of 5 %. or b) by particle size range and by mass fraction of oversize and undersize particles according to application. The maximum contents of oversize and undersize shall be a mass fraction of 5
27、% for application of the product as a filtration layer in multi media filters and a mass fraction of 10 % for use in single media filters. For use as a support layer, maximum mass fractions of oversize and undersize of 15 % are acceptable. See A.2.3 for examples of available particle sizes that are
28、used. NOTE 2 Other values can be necessary for certain applications. 5.3 Density 5.3.1 Bulk density loose The bulk density loose shall be in the range of 300 kg/m3to 900 kg/m3. 5.3.2 Bulk density packed The bulk density packed shall be in the range of 320 kg/m3to 950 kg/m3. 6 Chemical properties Thi
29、s European Standard specifies the minimum purity requirements for expanded aluminosilicate used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities may
30、 be present and, if so, this shall be notified to the user and when necessary to relevant authorities. Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for treatment of water intended for human consumption, taking into account raw wa
31、ter quality, contents of other impurities and additives used in the products not stated in the product standard. Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the
32、production process or raw materials lead to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. The content of acid-soluble material shall be less than a mass fraction of 7 %. NOTE 1 The exact composition does not influence filtration pro
33、perties and is given in A.2.1. BS EN 12905:2012EN 12905:2012 (E) 7 After filling, washing and commissioning of a filter system producing drinking water, expanded aluminosilicates should not increase the concentrations of chemical parameters (see 1). NOTE 2 Water extractable substances, determined in
34、 accordance with the method for granular materials given in EN 12902, can be used to estimate the leaching of the chemicals specified in EN 12902. 7 Test methods 7.1 Sampling Prepare the laboratory sample(s) required by the relevant procedures described in EN 12902. 7.2 Analysis 7.2.1 Particle size
35、distribution The particle size distribution shall be determined in accordance with EN 12902. 7.2.2 Bulk density loose The bulk density loose shall be determined in accordance with EN 12902. 7.2.3 Bulk density packed The bulk density packed shall be determined in accordance with EN 12902. 7.2.4 Acid-
36、soluble material The content of acid-soluble material shall be determined in accordance with EN 12902. 8 Labelling, transportation and storage 8.1 Means of delivery Expanded aluminosilicates shall be delivered in bags, semi-bulk containers, or bulk. In order that the purity of the product is not aff
37、ected, the means of delivery shall not have been used previously for any different product or it shall have been specially cleaned and prepared before use. 8.2 Labelling in accordance with the EU legislation 1)Expanded aluminosilicates are not listed within Annex VI of Regulation (EC) No 1272/2008 a
38、t the date of publication of this European Standard. The legislation 2, and its amendments for the purposes of its adaptation to technical and scientific progress contains a list of substances classified by the EU. Substances not listed in this regulation should be classified on the basis of their i
39、ntrinsic properties according to the criteria in the regulation by the person responsible for the marketing of the substance. 1) See 2. BS EN 12905:2012EN 12905:2012 (E) 8 8.3 Transportation regulations and labelling Expanded aluminosilicates are not dangerous goods. 8.4 Marking The marking shall in
40、clude the following: name “expanded clay”, “expanded slate“ or “expanded aluminosilicate”, trade name and particle size range; net mass or volume; name and the address of supplier and/or manufacturer; statement “this product conforms to EN 12905“. 8.5 Storage (long term chemical stability) Expanded
41、aluminosilicates can be stored for an unlimited period of time. BS EN 12905:2012EN 12905:2012 (E) 9 Annex A (informative) General information on expanded aluminosilicate A.1 Origin A.1.1 Raw material Clay and slate. A.1.2 Manufacturing process Clay and slate are produced by quarrying. The material i
42、s then thermally treated in a special oven, and finally crushed and sieved. A.2 Typical properties A.2.1 Chemical composition The composition depends on the origin of the raw materials. Examples are given in Table A.1. Table A.1 Chemical composition Parameter Mass fraction in % SiO2range 55 to 75 Al
43、2O3range 10 to 25 Fe2O3range 2 to 15 CaO range 2 to 10K2O max 10 Na2O max 10 Mineralogical and petrological analyses give additional information. A.2.2 Mechanical strength The mechanical strength of aluminosilicates is high. Abrasion products consist of dust and small particles of material. They are
44、 formed during transportation, filling, and washing. Abrasion products are not completely removed by washing. The existing methods for determination of abrasion do not lead to exact results regarding behaviour of filter media during operation. They can be used only for comparison of different filter
45、 media. BS EN 12905:2012EN 12905:2012 (E) 10 A.2.3 Examples of particle size distribution Examples of particle size distribution described by different particle size ranges and a permissible mass fraction of oversize and undersize product are given in Table A.2. Table A.2 Examples of particle size r
46、ange Permissible mass fraction, % aParticle size range mm Undersize Oversize 0,6 to 1,6 5 5 1,4 to 2,5 1,6 to 2,5 2,0 to 3,15 2,0 to 4,0 2,5 to 4,0 10 10 aGenerally the maximum permitted mass fractions of undersize and oversize are 5 % for application of the product as a filtration layer in multi me
47、dia filters and 10 % for use in single media filters. Other particle size ranges can be specified. A.2.4 Density A.2.4.1 Absolute density The absolute density is generally in the range of 2,5 g/cm3to 2,8 g/cm3. A.2.4.2 Particle density dry The particle density dry is generally in the range of 0,6 g/
48、cm3to 1,5 g/cm3. A.2.4.3 Particle density wet The particle density wet is generally in the range of 1,3 g/cm3to 1,6 g/cm3. A.2.5 Porosity of particles The porosity of particles is generally in the range of volume fraction of 40 % to 75 %. A.3 Use A.3.1 Function Expanded aluminosilicates are used as
49、filtering materials and as a support for biofiltration. A.3.2 Specific amount The amount of expanded aluminosilicate used depends on the application. Filtration rate and filter media depth vary with the suspended matter content of the water to be filtered. BS EN 12905:2012EN 12905:2012 (E) 11 A.3.3 Means of application Expanded aluminosilicates are used in open or closed, single or multi media, filters. A.3.4 Secondary effects The product has no secondary effects. A.4 Hydraulic characteristics A.4.1 Inte
