1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12912:2012Products used for treatmentof water intended for humanconsumption BariteCopyright European Committee for Standardization Provided by IHS under license with CENNot
2、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12912:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12912:2012. Itsupersedes BS EN 12912:2005 which is withdrawn.The UK participation in its preparation was entrusted to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 77573 4ICS 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 12912:2012EUROPEAN STANDARD NORME EUROPENNE
6、EUROPISCHE NORM EN 12912 November 2012 ICS 71.100.80 Supersedes EN 12912:2005English Version Products used for treatment of water intended for human consumption - Barite Produits utiliss pour le traitement de leau destine la consommation humaine - Baryte Produkte zur Aufbereitung von Wasser fr den m
7、enschlichen Gebrauch - Baryt 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
8、 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 translation u
9、nder 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, Forme
10、r 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 COMIT E
11、UROPEN 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 12912:2012: ECopyright European Committee for Standardization Provided
12、 by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12912:2012EN 12912:2012 (E) 2 Contents Page Foreword 3Introduction . 41 Scope 52 Normative references 53 Terms, definitions and symbols . 54 Description . 55 Physical properties 66
13、Chemical properties 77 Test methods 78 Labelling, transportation and storage . 9Annex A (informative) General information on barite 11Bibliography 15Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without li
14、cense from IHS-,-,-BS EN 12912:2012EN 12912:2012 (E) 3 Foreword This document (EN 12912:2012) 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
15、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 and/or CENELEC shall not be he
16、ld responsible for identifying any or all such patent rights. This document supersedes EN 12912:2005. The significant technical difference between this edition and EN 12912:2005 is as follows: Updating of 8.2 in line with current legislation. According to the CEN/CENELEC Internal Regulations, the na
17、tional 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, Latvia, L
18、ithuania, 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 or networking permitted wit
19、hout license from IHS-,-,-BS EN 12912:2012EN 12912:2012 (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 information as to whether the produ
20、ct 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 force. NOTE Conformity wit
21、h 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 Committee for Standardizatio
22、n Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12912:2012EN 12912:2012 (E) 5 1 Scope This European Standard is applicable to barite used for treatment of water intended for human consumption. It describes the character
23、istics of barite and specifies the requirements and the corresponding test methods for barite 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 applicatio
24、n. 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 Definitio
25、ns EN 12902, Products used for treatment of water intended for human consumption Inorganic supporting and filtering materials Methods of test EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696) 3 Terms, definitions and symbols For the purposes of this document,
26、 the terms, definitions and symbols given in EN 12901:1999 apply. 4 Description 4.1 Identification 4.1.1 Chemical name Barium sulfate. 4.1.2 Synonym and common names Barite, baryte, heavy spar, tiff, cawk. 4.1.3 Chemical formula BaSO4. 4.1.4 CAS Registry number 1)13462-86-7. 1) Chemical Abstracts Se
27、rvice Registry 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 12912:2012EN 12912:2012 (E) 6 4.1.5 EINECS reference 2) 236-664-5. 4.2 Commercial form Barite accordi
28、ng to this European Standard is available in different particle size ranges. 5 Physical properties 5.1 Appearance The product has various light shades, including white to yellow, with a vitreous lustre. The product has an angular shape and a crystalline structure. The product shall be generally homo
29、geneous 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 manufacture using the method of test given in EN 12902. NOTE 1 The particle size can decrease during transportation and handling.
30、 The particle size distribution shall be described by either: a) effective size: (d10) with a maximum deviation of 5%; 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 unders
31、ize 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 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 fra
32、ctions 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 necessary for certain applications. 5.3 Density 5.3.1 Bulk density loose The bulk density loose shall be in the range of 2 200 kg/m3to 2 400 kg/m3. 2)
33、 European Inventory of Existing Commercial Chemical Substances. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12912:2012EN 12912:2012 (E) 7 5.3.2 Bulk density packed The
34、bulk density packed shall be in the range of 2 500 kg/m3to 2 600 kg/m3. 6 Chemical properties This European Standard specifies the minimum purity requirements for barite used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. D
35、epending 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 clarify whether it is of appropriate purity fo
36、r 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 these are likely to be present in signi
37、ficant quantities from the current production process and raw materials. If the 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 composition of the commercial product shall conform to the
38、 requirements specified in Table 1. Table 1 Composition of commercial product Parameter Limit in mass fraction % Barium sulfate min 92 Acid-soluble material max 3 NOTE The contents of BaSO4and acid-soluble material do not influence filtration properties but give information about the source of barit
39、e After filling, washing and commissioning of a filter system producing drinking water, barite should not increase the concentrations of chemical parameters (see 1). NOTE Water extractable substances, determined in accordance with the method for granular materials given in EN 12902, can be used to e
40、stimate 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 distribution The particle size distribution shall be determined in accordance with EN
41、12902. 7.2.2 Bulk density loose The bulk density loose shall be determined in accordance with EN 12902. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12912:2012EN 12912:2
42、012 (E) 8 7.2.3 Bulk density packed The bulk density packed shall be determined in accordance with EN 12902. 7.2.4 Main product - barium sulfate 7.2.4.1 Principle Melting of mineral with sodium carbonate followed by disintegration in water and filtration to recover water insoluble carbonates. The so
43、lid is treated with hydrochloric acid solution and the acid insoluble fraction is filtered off. Barium sulfate is precipitated by addition of ammonium sulfate solution and gravimetrically determined. 7.2.4.2 Reagents All reagents shall be of recognised analytical grade and the water used shall confo
44、rm to grade 3 in accordance with EN ISO 3696. 7.2.4.2.1 Ammonium hydroxide solution, NH4OH = 0,9 g/ml. 7.2.4.2.2 Ammonium sulfate solution, (NH4)2SO4100 g/l solution. 7.2.4.2.3 Hydrochloric acid, HCl = 1,18 g/ml. 7.2.4.2.4 Sodium carbonate, Na2CO3.7.2.4.2.5 Sodium carbonate solution, (Na2CO3) 30 g/l
45、 solution. 7.2.4.2.6 Methyl red, 0,5 g/l solution. 7.2.4.3 Apparatus Ordinary laboratory apparatus and glassware together with the following. 7.2.4.3.1 Platinum crucible. 7.2.4.3.2 Electric furnace, capable of being controlled at (850 25) C. 7.2.4.3.3 Porcelain crucible. 7.2.4.3.4 Oven, capable of b
46、eing controlled at (105 2) C. 7.2.4.4 Procedure Weigh in the platinum crucible (7.2.4.3.1), to the nearest 0,1 mg, about 0,5 g of barite previously finely powdered and dried at 105 C (m1). Add about 3 g of sodium carbonate (7.2.4.2.4), mix and heat until the melt is clear. Cool and carefully disinte
47、grate the solid with hot water. Filter and wash thoroughly the crucible and solid with hot sodium carbonate solution (7.2.4.2.5). Transfer the filter paper and the filtered solid to a 250 ml beaker and acidify with hydrochloric acid (7.2.4.2.3). Wash the crucible with few millilitres of hydrochloric
48、 acid and add the liquid to the solution. Boil the solution for 5 min and filter into a 600 ml beaker. Carefully wash the filter and the 250 ml beaker with water. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12912:2012EN 12912:2012 (E) 9 Add to the filtrate a few drops of methyl red indicator solution (7.2.4.2.6) and ammonium hydroxide solution (7.2.4.2.1) until the colour turns to yel
