1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12914:2012Products used for treatmentof water intended for humanconsumption PowderedperliteBS EN 12914:2012 BRITISH STANDARDNational forewordThis British Standard is the UK
2、 implementation of EN 12914:2012. Itsupersedes BS EN 12914:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented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 secreta
3、ry.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 77575 8ICS 71.100.80Compliance with a British Standard cannot conf
4、er 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 12914:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12914 October 2012 ICS
5、 71.100.80 Supersedes EN 12914:2005English Version Products used for treatment of water intended for human consumption - Powdered perlite Produits utiliss pour le traitement de leau destine la consommation humaine - Perlite en poudre Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch
6、- Perlit, pulverfrmig 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-date lists
7、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 translation under th
8、e 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, Former Yugos
9、lav 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 COMIT EUROPEN
10、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 12914:2012: EBS EN 12914:2012EN 12914:2012 (E) 2 Contents Page Foreword 3Intr
11、oduction . 41 Scope 52 Normative references 53 Terms, definitions and symbols . 54 Description . 55 Physical properties 66 Chemical properties 67 Specific properties. 78 Test methods 79 Labelling, transportation and storage . 8Annex A (informative) General information on powdered perlite 10Bibliogra
12、phy 12BS EN 12914:2012EN 12914:2012 (E) 3 Foreword This document (EN 12914:2012) 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 publication of an identic
13、al 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 not be held respon
14、sible for identifying any or all such patent rights. This document supersedes EN 12914:2005. The significant technical difference between this edition and EN 12914:2005 is as follows: Updating of 9.2 in line with current legislation. According to the CEN/CENELEC Internal Regulations, the national st
15、andards 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, Latvia, Lithuania,
16、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12914:2012EN 12914:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption caused by
17、 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 criteria, existing
18、 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 covered by this Europe
19、an Standard is subject to regulation or control by National Authorities. BS EN 12914:2012EN 12914:2012 (E) 5 1 Scope This European Standard is applicable to powdered perlite used for treatment of water intended for human consumption. It describes the characteristics of powdered perlite and specifies
20、 the requirements and the corresponding test methods for powdered perlite and 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. For dated referen
21、ces, 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 EN 12902, Product
22、s used for treatment of water intended for human consumption Inorganic supporting and filtering materials Methods of test EN ISO 10058 (all parts), Chemical analysis of magnesite and dolomite refractory products (alternative to the X-ray fluorescence method) (ISO 10058) 3 Terms, definitions and symb
23、ols For the purposes of this document, the terms, definitions and symbols given in EN 12901:1999 apply. 4 Description 4.1 Identification 4.1.1 Chemical name Not applicable. 4.1.2 Synonym or common names Perlite, expanded perlite. 4.1.3 Chemical formula Not applicable. 4.1.4 CAS Registry number 1)Not
24、 available. 1) Chemical Abstracts Service Registry Number. BS EN 12914:2012EN 12914:2012 (E) 6 4.1.5 EINECS Reference 2)Not available. 4.2 Commercial form The product is available in white powder forms in grades differing in permeability. 5 Physical properties 5.1 Appearance White powder. 5.2 Partic
25、le size distribution 5.2.1 Particle size A mass fraction of at least 95 % shall have a particle size less than 1 000 m. NOTE Other values can be necessary for certain applications. The particle size distribution is commonly specified as a mass fraction of 95 % less than a given particle size. The pa
26、rticle size distribution shall be within the manufacturers declared values. 5.2.2 Uniformity coefficient Not relevant. 5.2.3 Oversize and undersize particles The proportion of oversize and undersize particles shall be within the manufacturers declared values. 5.3 Density The bulk density packed shal
27、l be in the range of 200 kg/m3to 700 kg/m3.6 Chemical properties This European Standard specifies the minimum purity requirements for powdered perlite used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw
28、 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. Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for treatment of wate
29、r intended for human consumption, taking into account raw water quality, contents of other 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 f
30、rom the current production process and raw materials. If the production process or raw 2) European Inventory of Existing Commercial Chemical Substances. BS EN 12914:2012EN 12914:2012 (E) 7 materials lead to significant quantities of impurities, by-products or additives being present, this shall be n
31、otified to the user. The composition of the commercial product shall conform to Table 1. Table 1 Composition of commercial product Parameter Limit in mass fraction in% of the product SiO2min 70Al2O3min 10 Na2O + K2O min 5Mass loss at 150 C max 5 After filling, washing and commissioning of a filter s
32、ystem producing drinking water, powdered perlite should not increase the concentrations of chemical parameters (see 1). NOTE Water extractable substances, determined in accordance with the method for powdered materials given in EN 12902, can be used to estimate the leaching of the chemicals specifie
33、d in EN 12902. 7 Specific properties The permeability shall be within 15 % of the manufacturers declared value and the cake density shall be within 5 % of the manufacturers declared value. 8 Test methods 8.1 Sampling Prepare the laboratory sample(s) required by the relevant procedures described in E
34、N 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 packed The bulk density packed shall be determined in accordance with EN 12902. 8.2.3 Content of silica The content of silica shall be determined
35、in accordance with EN 12902. 8.2.4 Content of aluminium oxide The content of Al2O3shall be determined in accordance with EN ISO 10058. BS EN 12914:2012EN 12914:2012 (E) 8 8.2.5 Content of sodium and potassium oxides The contents of Na2O and K2O shall be determined in accordance with EN ISO 10058. 8.
36、2.6 Mass loss at 150 C The mass loss at 150 C shall be determined using the method for water content described in EN 12902 using a temperature of (150 5) C. 8.2.7 Permeability The permeability shall be determined in accordance with EN 12902. 8.2.8 Cake density The cake density shall be determined in
37、 accordance with EN 12902. 9 Labelling, transportation and storage 9.1 Means of delivery Perlite shall be delivered in bags, big bags or in bulk. In 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 h
38、ave been specially cleaned and prepared before use. 9.2 Labelling according to the EU legislation 3)Powdered perlite is not listed within Annex VI of Regulation (EC) No 1272/2008 at the date of publication of this European Standard. The legislation 2, and its amendments for the purposes of its adapt
39、ation 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 the person responsible for the marketing of the subst
40、ance. NOTE Additional national regulations could apply to the labelling of this product. 9.3 Transportation regulations and labelling Powdered perlite is not listed under a UN Number 4). Powdered perlite is not classified as a dangerous product for road, rail, sea and air transportation. 9.4 Marking
41、 The marking shall include the following: name “Powdered perlite“, trade name and grade; 3)See 2. 4) United Nations Number. BS EN 12914:2012EN 12914:2012 (E) 9 net mass; name and the address of supplier and/or manufacturer; statement “this product conforms to EN 12914“. 9.5 Storage 9.5.1 Long term s
42、tability The product is stable but hygroscopic. The product can be stored for one or two years if kept dry and away from volatile materials which are adsorbed on the product. 9.5.2 Storage incompatibilities The product shall be kept away from volatile solvents, odorous products and moisture. BS EN 1
43、2914:2012EN 12914:2012 (E) 10 Annex A (informative) General information on powdered perlite A.1 Origin A.1.1 Raw material Industrial manufactured perlite is produced by mining and grinding (to particle size less than 1 mm) natural rhyolite. This product contains a mass fraction of 2 % to 5 % of wate
44、r as water of crystallisation. A.1.2 Manufacturing process Ground rhyolite is spread into the flame of a burner. At the same time, rhyolite loses its water and fuses; the water is instantly volatilised and the expansion of this steam blows the fused rhyolite into cenospheres which are rapidly cooled
45、 out of the flame. The next step is a careful grinding of cooled cenospheres and a selection by air stream to split the product into different grades according to permeability. As the cooling of cenospheres is very fast, there are no crystalline products such as quartz or cristobalite, and expanded
46、perlite remains vitreous. A.2 Typical properties A.2.1 Composition of commercial products The contents on a calcined basis are generally: SiO2: mass fraction of 75 %; Al2O3: mass fraction of 15 %; Na2O + K2O: mass fraction of 5 %. A.2.2 Density The absolute density of the product is 2,2 g/cm3. A.3 U
47、se Powdered perlite is used to remove solid contaminants from water. BS EN 12914:2012EN 12914:2012 (E) 11 A.4 Hydraulic characteristics A.4.1 Permeability The permeability is from 1 Darcy to 5 Darcy (1 Darcy = 0,987 x 10-12m2). A.4.2 Cake density The cake density is below 0,250 g/cm3for all products
48、. A.5 Rules for safe handling and use It is advised to avoid exposure to the dust which irritates the nose and throat when inhaled. A.6 Emergency procedures A.6.1 First aid In case of contact with skin there is no danger, it is recommended to wash with water. In case of contact with eyes, it is reco
49、mmended to flush with plenty of water. In case of inhalation, it is recommended to move to fresh air. A.6.2 Spillage It is recommended to sweep up and to discard in a refuse container or to repackage. A.6.3 Fire No special precautions are necessary. BS EN 12914:2012EN 12914:2012 (E) 12 Bibliography 1 98/83/EC, Council Directive of 3 November 1998 on the quality of water intended for human consumption
