SIST EN 12948:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Materiali za apnjenje – Ugotavljanje porazdelitev velikosti pri suhem in mokrem sejanjuCalcium-/Magnesium-Bodenverbesserungsmittel - Bestimmung der Korngrößenverteilung durch Trocken- und NasssiebungAmendements minéraux basiques - Détermination de la distribution granulométrique par tamisage a sec ou a l'état humideLiming materials - Determination of size distribution by dry and wet sieving65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 12948:2002SIST EN 12948:2003en01-oktober-2003SIST EN 12948:2003SLOVENSKI
STANDARD



SIST EN 12948:2003



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12948May 2002ICS 65.080English versionLiming materials - Determination of size distribution by dry andwet sievingAmendements minéraux basiques - Détermination de ladistribution granulométrique par tamisage à sec ou à l'étathumideCalcium-/Magnesium-Bodenverbesserungsmittel -Bestimmung der Korngrößenverteilung durch Trocken- undNasssiebungThis European Standard was approved by CEN on 6 March 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions 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 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12948:2002 ESIST EN 12948:2003



EN 12948:2002 (E)2ContentspageForeword.3Introduction.41Scope.42Normative references.43Principle.54Apparatus.55Sampling.56Procedure.57Expression of results.78Precision.89Test report.9Annex A
(informative)
Results of an interlaboratory trial to determine the size distribution by dry andwet sieving.10Bibliography.11SIST EN 12948:2003



EN 12948:2002 (E)3ForewordThis document EN 12948:2002 has been prepared by Technical Committee CEN/TC 260, "Fertilizers and limingmaterials", the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latestby November 2002.Annex A is informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.SIST EN 12948:2003



EN 12948:2002 (E)4IntroductionThe dry sieving of powdered material containing individual particles can be carried out quite easily. This method issimple, quick, cheap and enables the determination of the particle size of water-soluble materials. Therefore the drysieving method should always be used first. However, the sieve apertures can become blocked by sampleparticles, a phenomenon known as blinding. Blinding is mainly caused by caking and the production of electrostaticcharges, particularly on sieves with small apertures. Dry sieving of very wet material can also lead to blinding.These difficulties are not encountered with the wet sieving method, which is applicable to any kind of material suchas powders (dry or wet), paste-like products or granules except those containing water-soluble constituents.In order to ensure the comparability of results, all masses of size fractions are expressed as dry matter.1 ScopeThis European Standard specifies two methods for the determination of the particle size distribution of limingmaterials.The dry sieving method (method A) is applicable to all liming materials except wet and paste-like products.Method A is not applicable, if blinding, caking, electrostatic charges or agglomeration occur after predrying.The wet sieving method (method B) is applicable to products which are susceptible to blinding, caking, electrostaticcharges or agglomeration after predrying.Method B can be used to determine the primary particle size distribution of granulated products.Method B is not applicable to burnt lime and liming materials containing water-soluble constituents.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 1235:1995, Solid fertilizers — Test sieving (ISO 8397:1988, modified).EN 1482, Sampling of solid fertilizers and liming materials.EN 12048, Solid fertilisers and liming materials — Determination of moisture content — Gravimetric method bydrying at (105 ± 2) °C (ISO 8190:1992, modified).ISO 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes ofopenings.ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth.SIST EN 12948:2003



EN 12948:2002 (E)53 Principle3.1 Method ADry sieving of a liming material with one or more test sieves by hand or using a mechanical sieving machine.3.2 Method BDispersion of agglomerated or granulated liming materials with water.Wet sieving of the dispersed liming materials under continuous water spraying by hand or using a mechanicalsieving machine. Drying of the different fractions retained on the sieves.4 ApparatusUsual laboratory apparatus and in particular the following.4.1 Balance, capable of weighing to the nearest 0,01 g.4.2 Mechanical shaker (sieving machine), capable of imparting both horizontal and vertical motion tomaterial inside a nest of sieves, fitted with a lid with a water intake and a receiver with a water outlet when used formethod B.NOTEHand sieving can be carried out instead of mechanical sieving.4.3 Stainless steel woven wire test sieves, conforming to ISO 3310-1 and of appropriate nominal aperturesizes.4.4 Stopwatch4.5 Soft brush4.6 Oven, capable of being control
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