1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12910:2012Products used for treatmentof water intended for humanconsumption GarnetCopyright European Committee for Standardization Provided by IHS under license with CENNot
2、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12910:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12910:2012. Itsupersedes BS EN 12910:2005 which is withdrawn.The UK participation in its preparation was entrusted to
3、 TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication
4、. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77572 7ICS 13.060.20; 71.100.80Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Co
5、mmittee on 31 January 2013.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12910:2012EUROPEAN STANDARD NORME EUROPENNE
6、EUROPISCHE NORM EN 12910 November 2012 ICS 71.100.80 Supersedes EN 12910:2005English Version Products used for treatment of water intended for human consumption - Garnet Produits utiliss pour le traitement de leau destine la consommation humaine - Grenat Produkte zur Aufbereitung von Wasser fr den m
7、enschlichen Gebrauch - Granatsand 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 any alteration. Up-to
8、-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 language made by translat
9、ion 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, Estonia, Finland,
10、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 STANDARDIZATION CO
11、MIT 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 12910:2012: ECopyright European Committee for Standardization Pro
12、vided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 2 Contents Page Foreword 3Introduction . 41 Scope 52 Normative references 53 Terms, definitions and symbols . 54 Description . 55 Physical propertie
13、s 56 Chemical properties 67 Specific properties. 78 Test methods 79 Labelling, transportation and storage . 7Annex A (informative) General information on garnet . 9Bibliography 12Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or n
14、etworking permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 3 Foreword This document (EN 12910:2012) 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 st
15、andard, either by publication of an identical text or by endorsement, at the latest by May 2013, and conflicting national standards shall be withdrawn at the latest by May 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN
16、and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12910:2005. The significant technical difference between this edition and EN 12910:2005 is as follows: Updating 9.2 in line with current legislation. According to the CEN/CENELEC I
17、nternal Regulations, 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
18、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction
19、or networking permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption caused by the product covered by this European Standard: a) this European Standard provides no informat
20、ion 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 criteria, existing national regulations concerning the use and/or the characteristics of this product remain in
21、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 covered by this European Standard is subject to regulation or control by National Authorities. Copyright European Co
22、mmittee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 5 1 Scope This European Standard is applicable to garnet used for treatment of water intended for human consumption.
23、It describes the characteristics of garnet and specifies the requirements and the corresponding test methods for garnet. 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 indisp
24、ensable for its application. 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 fil
25、tering materials Definitions 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.
26、 4 Description 4.1 Identification 4.1.1 Chemical name(s) Almandite Fe3Al2(SiO4)3.Andradite Ca3Fe2(SiO4)3. NOTE Both forms can have other metals in partial substitution for the major constituents. 4.2 Commercial form Each of the two main types of garnet is available in different particle size grades.
27、 5 Physical properties 5.1 Appearance The product is a pink, red or brown to black coloured granular material. Cubic crystals; the particle shape can be angular to sub-angular to rounded depending on origin. The product shall be generally homogeneous and shall be visibly free of extraneous matter. C
28、opyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 6 5.2 Particle size distribution The particle size distribution shall be determined on samples ta
29、ken 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 %; uniformity coefficient : (U) w
30、hich 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 % for application of the prod
31、uct 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 used. NOTE 2 Other values can
32、 be necessary for certain applications. 5.3 Density 5.3.1 General The density of garnet varies with the mineralogical form. Garnet with absolute density lower than 3,8 g/cm3should not be used in multi media sand - garnet filters to prevent intermixing of media. 5.3.2 Bulk density loose Almandite: Th
33、e bulk density loose shall be in the range of 2 150 kg/m3to 2 250 kg/m3. Andradite: The bulk density loose shall be in the range of 1 850 kg/m3to 2 000 kg/m3. 5.3.3 Bulk density packed Almandite: The bulk density packed shall be in the range of 2 350 kg/m3to 2 400 kg/m3. Andradite: The bulk density
34、packed shall be in the range of 1 950 kg/m3to 2 250 kg/m3. 6 Chemical properties This European Standard specifies the minimum purity requirements for garnet used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on t
35、he raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking
36、permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 7 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 oth
37、er impurities and additives used in the products not stated in this 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 m
38、aterials lead to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. The chemical composition varies with the mineralogical form. Typical data are given in Table A.1. NOTE 1 Because of the nature of the occurrence and production of garnet
39、, a small proportion of other minerals, in particular silica sand and ilmenite, can be present in the commercial product. After filling, washing and commissioning of a filter system producing drinking water, garnet should not increase the concentrations of chemical parameters (see 1). NOTE 2 Water e
40、xtractable substances, determined in 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 Specific properties Garnet is a non-reactive high density filtration and support medium. It is used specifically be
41、cause of its high density. 8 Test methods 8.1 Sampling Prepare the laboratory sample(s) required by the relevant procedures described in EN 12902. 8.2 Analysis 8.2.1 Particle size distribution The particle size distribution shall be determined in accordance with EN 12902. 8.2.2 Bulk density loose Th
42、e bulk density loose shall be determined in accordance with EN 12902. 8.2.3 Bulk density packed The bulk density packed shall be determined in accordance with EN 12902. 9 Labelling, transportation and storage 9.1 Means of delivery Garnet shall be delivered in bags, semi-bulk containers, or bulk. In
43、order that the purity of the product is not affected, 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. Copyright European Committee for Standardization Provided by IHS under license with CENNot for Re
44、saleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 8 9.2 Labelling in accordance with the EU legislation 1)Garnet is not listed within Annex VI of Regulation (EC) No 1272/2008 at the date of publication of this European Standard. The legislatio
45、n 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 intrinsic properties according to the criteria in the regulation by
46、the person responsible for the marketing of the substance. NOTE Additional national regulations may apply to the labelling of this product. 9.3 Transportation regulations and labelling Garnet is not classified as dangerous product for road, rail, sea and air transportation. Garnet is not listed unde
47、r a UN Number 2). 9.4 Marking The marking shall include the following: name “Garnet“, trade name and grade; net mass; name and the address of supplier and/or manufacturer; statement “This product conforms to EN 12910“. 9.5 Storage (long term stability) Garnet can be stored for an unlimited period of
48、 time. 1) See 2. 2) United Nations Number. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12910:2012EN 12910:2012 (E) 9 Annex A (informative) General information on garnet A.1 Origin A.1.1 Raw material Garnet exists in nature in six main varieties of which only two forms are generally used as filtration and supporting materials: almandite garnet and andradite garnet. Both these varieti
