1、BRITISH STANDARDBS EN 12905:2005Products used for treatment of water intended for human consumption Expanded aluminosilicateThe European Standard EN 12905:2005 has the status of a British StandardICS 71.100.80g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g5
2、0g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 12905:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 December 2005 BSI 20 December 2005ISBN 0 580 47442 9National forew
3、ordThis British Standard is the official English language version of EN 12905:2005. It supersedes BS EN 12905:1999 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee CII/59, Chemicals for drinking water treatment, which has the responsibility to: A list o
4、f organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Co
5、rrespondence 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 with a British Standard does no
6、t 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 UK interests informed; monitor related international and European developments
7、and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since
8、publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12905October 2005ICS 71.100.80 Supersedes EN 12905:1999 English VersionProducts used for treatment of water intended for humanconsumption - Expanded aluminosilicateProduits utiliss pour le traitement de leau destine l
9、aconsommation humaine - Aluminosilicate expansProdukte zur Aufbereitung von Wasser fr denmenschlichen Gebrauch - Expandierte AluminiumsilikateThis European Standard was approved by CEN on 4 August 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the cond
10、itions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three of
11、ficial versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, B
12、elgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOM
13、IT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12905:2005: EEN 12905:2005 (E) 2 Contents Foreword 3 Introduction4 1
14、 Scope5 2 Normative references5 3 Terms, definitions and symbols.5 4 Description.5 5 Physical properties .5 6 Chemical properties 6 7 Test methods .7 8 Labelling, transportation and storage7 Annex A (informative) General information on expanded aluminosilicate.9 Bibliography.12 EN 12905:2005 (E) 3 F
15、oreword This European Standard (EN 12905:2005) 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 publication of an identical text or by endorsement, at the
16、latest by April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. This European Standard supersedes EN 12905:1999. Significant technical difference between this edition and EN 12905:1999 is as follows: a) replacement of the reference to EU Directive 80/778/EEC
17、of 15 July 1980 with the latest Directive in force (see 1). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, G
18、ermany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12905:2005 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended
19、for human consumption, 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 verifi
20、able European 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 th
21、e product covered by this European Standard is subject to regulation or control by National Authorities. EN 12905:2005 (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 sp
22、ecifies the requirements and the corresponding test methods for expanded aluminosilicate. It gives information on its use in water treatment. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edit
23、ion 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 EN 12902, Products used for treatm
24、ent of water intended for human consumption - Inorganic supporting and filtering materials - Methods of test 3 Terms, definitions and symbols For the purposes of this European Standard, the terms, definitions and symbols given in EN 12901:1999 apply. 4 Description 4.1 Identification 4.1.1 Chemical n
25、ame 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-brown coloured granula
26、r 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. 5.2 Particle size distribution The particle size distribution shall be determined on samples taken at the point of manufa
27、cture using the method of test given in EN 12902. NOTE 1 The particle size can decrease during transportation and handling. EN 12905:2005 (E) 6 The particle size distribution shall be described by either: a) effective size: (d10) with a maximum deviation of 5 %; uniformity coefficient: (U) which sha
28、ll 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% for application of the product as a f
29、iltration 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 used. NOTE 2 Other values can be necessar
30、y 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 This European Standard specifies the minimum
31、 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 be present and, if so, this shall be not
32、ified to the user and when necessary to relevant authorities. NOTE 1 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 water quality, contents of other imp
33、urities 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 production process or raw material
34、s 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 2 The exact composition does not influence filtration properties and is given in A.2.1. NOTE
35、 3 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 4 Water extractable substances, determined in accordance with the method for granular materials given in EN 1
36、2902, can be used to estimate the leaching of the chemicals specified in EN 12902. EN 12905:2005 (E) 7 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 distribution The particle size distribution
37、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-soluble material The content of acid-soluble
38、 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 affected, the means of delivery shall not have
39、been used previously for any different product or it shall have been specially cleaned and prepared before use. 8.2 Risk and safety labelling in accordance with the EU Directives 1)Expanded aluminosilicates are not listed as dangerous substances at the date of publication of this European Standard.
40、NOTE Annex I of the Directive 67/548/EEC on Classification, packaging and labelling of dangerous substances and its amendments and adaptations in the European Union contains a list of substances classified by the EU. Substances not in this Annex I should be classified on the basis of their intrinsic
41、 properties according to the criteria in the Directive by the person responsible for the marketing of the substance. 8.3 Transportation regulations and labelling Expanded aluminosilicates are not dangerous goods. 1)See 2. EN 12905:2005 (E) 8 8.4 Marking The marking shall include the following: - nam
42、e “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 aluminosilicates c
43、an be stored for an unlimited period of time. EN 12905:2005 (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, then thermally treated in a special oven, and fi
44、nally 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 Al2O3range 10 to 25 Fe2O3range 2 to 15 CaO range 2
45、 to 10 K2O max. 10Na2O 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 formed during transportation, filling, and wa
46、shing. 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 media. EN 12905:2005 (E) 10 A.2.3 Examples of
47、 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 range Permissible mass fraction, %aParticle size range mm Und
48、ersize 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 media filters and 10 % for use in single media filters. Other p
49、article 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/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 filtering materials and a
