1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12913:2012Products used for treatmentof water intended for humanconsumption Powdereddiatomaceous earthBS EN 12913:2012 BRITISH STANDARDNational forewordThis British Standar
2、d is the UK implementation of EN 12913:2012. Itsupersedes BS EN 12913:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented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
3、its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77574 1ICS 13.060.20; 71.100.80Compliance with a Britis
4、h Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationDate Text affectedBS EN 12913:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1
5、2913 November 2012 ICS 71.100.80 Supersedes EN 12913:2005English Version Products used for treatment of water intended for human consumption - Powdered diatomaceous earth Produits utiliss pour le traitement de leau destine la consommation humaine - Terre de diatomes en poudre Produkte zur Aufbereitu
6、ng von Wasser fr den menschlichen Gebrauch - Kieselgur, 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 stan
7、dard without any 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 a
8、ny other language 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 Rep
9、ublic, Denmark, 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. EUROPEA
10、N COMMITTEE FOR 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 12913:2012: EBS EN 12913:2012EN
11、 12913:2012 (E) 2 Contents Page Foreword 3Introduction . 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) Gener
12、al information on powdered diatomaceous earth . 10Annex B (normative) General rules relating to safety . 12Bibliography 13BS EN 12913:2012EN 12913:2012 (E) 3 Foreword This document (EN 12913:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by
13、 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 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 o
14、f the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12913:2005. The significant technical difference between this edition and EN 12913:2005 is as follows: Upda
15、ting of 9.2 in line with current legislation. According to the CEN/CENELEC Internal 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, Form
16、er 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 the United Kingdom. BS EN 12913:2012EN 12913:2012 (E) 4 Intro
17、duction 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 information as to whether the product may be used without restriction in any of the Member States of t
18、he 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 force. NOTE Conformity with this European Standard does not confer or imply acceptance or appr
19、oval 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. BS EN 12913:2012EN 12913:2012 (E) 5 1 Scope This European Standard is applicable to powdered diatomaceous earth use
20、d for treatment of water intended for human consumption. It describes the characteristics of powdered diatomaceous earth and specifies the requirements and the corresponding test methods for powdered diatomaceous earth and gives information on its use in water treatment. It also determines the rules
21、 relating to safe handling and use of powdered diatomaceous earth (see Annex B). 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 references, only the edition cited applies. For undat
22、ed 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 treatment of water intended for hum
23、an 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 Identification 4.1.1 Chemical name Not applicable. 4.1.2 Synonym or commo
24、n names Diatomite, Kieselguhr, Diatomaceous earth, Calcined diatomite, Flux calcined diatomite. 4.1.3 Chemical formula Not applicable. 4.1.4 CAS Registry numbers 1) 61 790-53-2 Dry and ground; 91 053-39-3 Diatomaceous calcined; 68 855-54-9 Flux calcined. 1) Chemical Abstracts Service Registry Number
25、. BS EN 12913:2012EN 12913:2012 (E) 6 4.1.5 EINECS reference 2)Calcined 293-303-4. 4.2 Commercial form The product is available in powder forms in many grades differing in permeability. 5 Physical properties 5.1 Appearance The product is a white (flux calcined), pink (calcined), or white to green (n
26、atural), powder. 5.2 Particle 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
27、given particle size. The particle 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 b
28、ulk density packed The bulk density packed shall be in the range of 150 kg/m3to 550 kg/m3. 6 Chemical properties This European Standard specifies the minimum purity requirements for powdered diatomaceous earth used for the treatment of water intended for human consumption. Limits are given for impur
29、ities 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 notified to the user and when necessary to relevant authorities. Users of this product should check the national regulations in order to clarif
30、y whether it is of appropriate purity for treatment of water 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
31、 these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw 2) European Inventory of existing Commercial Chemical Substances. BS EN 12913:2012EN 12913:2012 (E) 7 materials lead to significant quantities of impuriti
32、es, by-products or additives being present, this shall be notified 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 % SiO2min 85Mass loss at 150 C max 5 After filling, washing and commissioning
33、 of a filter system producing drinking water, powdered diatomaceous earth 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
34、of the chemicals specified 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
35、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 packed The bulk density packed shall be determined in accordance with EN 12902. 8.2.3 Content of silica The content of si
36、lica shall be determined in accordance with EN 12902. 8.2.4 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. 8.2.5 Permeability The permeability shall be determined in accordance with EN 12902. BS
37、 EN 12913:2012EN 12913:2012 (E) 8 8.2.6 Cake density The cake density shall be determined in accordance with EN 12902. 9 Labelling, transportation and storage 9.1 Means of delivery Diatomaceous earth shall be delivered in bags, big bags, or in bulk. In order that the purity of the product is not aff
38、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. 9.2 Labelling according to the EU legislation 3)The following labelling requirements shall apply to powdered diatomaceous earth at the date of p
39、ublication of this European Standard. Hazard pictogram Figure 1 GHS07 Signal word: Warning Hazard statements: H332: Harmful if inhaled NOTE Precautionary statements (P statements) should be provided by the company being responsible for the marketing of the substance. They should be indicated on the
40、packaging label and in the extended safety data sheet (eSDS) of the substance. The regulation 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 classifie
41、d on the basis of their intrinsic properties according to the criteria in the regulation by the person responsible for the marketing of the substance. 9.3 Transportation regulations and labelling Powdered diatomaceous earth is not classified as a dangerous product for road, rail, sea or air transpor
42、tation. 3) See 2. BS EN 12913:2012EN 12913:2012 (E) 9 Powdered diatomaceous earth is not listed under a UN Number 4). 9.4 Marking The marking shall include the following: name “Powdered diatomaceous earth“, trade name and grade; net mass; name and the address of supplier and/or manufacturer; stateme
43、nt “this product conforms to EN 12913“. 9.5 Storage 9.5.1 Long-term stability 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 kep
44、t away from volatile solvents, odorous products and moisture. 4) United Nations Number. BS EN 12913:2012EN 12913:2012 (E) 10 Annex A (informative) General information on powdered diatomaceous earth A.1 Origin A.1.1 Raw materials Powdered diatomaceous earths are produced by mining natural diatomite,
45、which is a deposit of monocellular algae. A.1.2 Manufacturing process Diatomite is dried and ground. Particles over 50 m in size are removed by cyclones or selectors, and then products are calcined in a kiln between 950 C and 1 200 C, depending on the product being manufactured. The increased temper
46、ature agglomerates the diatomaceous earths; this is very useful to get a wide range of products. If more agglomeration is needed, diatomaceous earths are activated with sodium carbonate between 1 000 C and 1 200 C. This gives coarser and white diatomaceous earths. As these treatments give a superfic
47、ial fusion of diatomaceous particles, the specific surface area of the calcined or flux calcined product is lower than the specific surface area of the raw material. A.2 Typical properties A.2.1 Composition of commercial product The content of silica (SiO2), on a calcined basis, should be not less t
48、han a mass fraction of 85 %. The main impurities are: Aluminium oxide Al2O3; Iron oxide Fe2O3; Titanium oxide TiO2; Calcium oxide CaO; Magnesium oxide MgO; Potassium oxide K2O; Sodium oxide Na2O. The total impurity content should be lower than a mass fraction of 15 %. In the case of diatomaceous ear
49、ths activated with Na2CO3, the mass fraction of sodium oxide is around 4 %. BS EN 12913:2012EN 12913:2012 (E) 11 A.2.2 Density The absolute density of the product is 2,2 g/cm3. A.3 Use Powdered diatomaceous earths are used to remove solid contaminants from water by retention. A.4 Hydraulic characteristics A.4.1 Permeability The permeability of calcined products is from 0,030 Darcy to 0,500 Darcy (1 Darcy = 0,987 x 10-12m2). The permeability of activated (or fl
