BS ISO BRITISH STANDARD 10835:2007 Versioncorrectasof03/01/2015,(c)TheBritishStandardsInstitution2013 Direct reduced iron and hot briquetted iron - Sampling and sample preparation ICS 73.060.10 BSi 12 &23<,1*:,7+287%6, 3(50,66,21 (;&(37 $6 3(50,77(%<&23<5,*+7 /$: British Standards BS ISO 10835:2007 National foreword This British Standard is the UK implementation of IS0 10835:2007. The UK participation in its preparation was entrusted to Technical Committee ISE/58, Iron ores. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunityfrom legal obligations. Shau Kee Library,HKUST, This British Standard was Amendmentsissuedsincepublication published under the authority of the Standards Policy and Amd. No. Date Comments Strategy Committee copi on 30 November 2007 BSI 2007 icen ISBN 978 0 580 60937 4 BS ISO 10835:2007 ISO INTERNATIONAL STANDARD 10835 Second edition 2007-02-15 Direct reduced iron and hot briquetted iron Sampling and sample preparation Minerais de fer prereduits et fer briquete a chaud-Echantllonnage et preparationdeséchantllons Reference number ISO10835:2007(E) 4 ISO ii BS ISO 10835:2007 StandardsInstitution2013 Contents Page Foreword.. 1 Scope .. 2 Normative references. The British 3 Terms and definitions.. 4 Generalconsiderationsforsamplingandsamplepreparation 3 4.1 Basic requirements... 4.2 Establishinga sampling scheme ... 4.3 System verification .... 5 5 Fundamentalsofsamplingandsamplepreparation 5.1 Minimization of bias. asof03/01/2015, 5.1.1 General... 5.1.2 Minimizationof particle-sizedegradation... 5.1.3 Extractionof increments.... 5.1.4 Incrementmass. 5.2 Overall precision... 5.3 Quality variation... 9 5.4 Sampling precision and numberofprimary increments 5.4.1 Mass-basis sampling... 5.4.2 Time-basis sampling ... Versioncorrect 5.5 Precisionof samplepreparation and overall precision.... 5.5.1 General.... 11 5.5.2 Preparation and measurement of gross sample 5.5.3 Preparation and measurement of partial samples 5.5.4 Preparation and measurement of each increment 11 6 Methods of sampling 12 6.1 Mass-basis sampling.. 12 HKUST 6.1.1 Mass of increment.. 12 6.1.2 Quality variation. 13 6.1.3 Number of primary increments 13 6.1.4 Sampling interval. 6.1.5 Methods of taking increments. 13 6.2 Time-basis sampling . 14 6.2.1 Mass of increment.. 6.2.2 Quality variation. 14 6.2.3 Number of increments.. 14 6.2.4 14 6.2.5 Methods oftaking increments. 14 6.3 Stratified random sampling within fixed mass or time intervals 15 15 6.3.1 General..... 6.3.2 Fixed mass intervals... 6.3.3 Fixed time intervals ... 7 15 icensedcopy 7.1 General..... 15 7.2 16 7.3 Robustnessofsampling installation 7.4 Versatilityof samplingsystem 7.5 Primary samplers... 16 7.5.1 Location 16 7.5.2 Types of primary sampler ii BSISO10835:2007 7.5.3 General design criteria for primary cutters 7.5.4 Cutterapertureofprimarysampler.. 21 7.5.5 Cutter speed of primary sampler. 21 7.6 Secondary and subsequent samplers 22 7.7 7.7.1 Arrangement for samplepreparation. 22 7.7.2 Crushers.. 22 7.7.3 Dividers .22 7.7.4 7.8 Checking precision and bias 27 7.9 Cleaning and maintenance. 27 7.10 Exampleofaflowsheet 27 8 Sampling from stationary situations. 29 9 Stopped-belt reference sampling .29 10 Sample preparation.. 30 10.1 Fundamentals ... 10.1.1 General .... 30 10.1.2 Crushing and grinding. 30 10.1.3 10.1.4 Sampledivision 30 10.1.5 Mass of divided sample... 10.1.6 Split use and multiple use of sample.. 33 10.2 Method ofconstitutingpartial samples oragross sample 10.2.1 General... 33 10.2.2 Method ofconstitutionformass-basis sampling 33 10.2.3 Method of constitution for time-basis sampling... . 34 10.3 Mechanical methods of division... 10.3.1 Mechanical increment division 34 10.3.2 Other mechanical-division methods 35 10.4 Manual method