1、Designation:C184316Standard Test Method forDetermining Moisture Content in Uranium-Ore Concentrate1This standard is issued under the fixed designation C1843;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is used to determine compliance withSpecification C967 for the requirements of moisture in uraniumore concentrates(UOC).A
3、procedure is given to determine theapproximate temperature for drying the UOC;normally 110Cbut possibly 165C for uranyl peroxides.The dried uraniumore-concentrate resulting from this procedure is then used forperforming additional analyses described in SpecificationC967.1.2 The values stated in SI u
4、nits are to be regarded as thestandard.The values given in parentheses are mathematicalequivalents that are provided for information only and are notconsidered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of t
5、he user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C859 Terminology Relating to Nuclear MaterialsC967 Specification for Uranium Ore ConcentrateC1022 Test Meth
6、ods for Chemical and Atomic AbsorptionAnalysis of Uranium-Ore ConcentrateC1075 Practices for Sampling Uranium-Ore ConcentrateE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Except as otherwise defined herein,definitions of termsare as given in Terminology C859.4.Summ
7、ary of Test Method4.1 The need to establish an appropriate temperature fordrying may only occur once for a specific ore concentrate butmay be evaluated if the property of the ore is suspected to havechanged.An example of a UOC material that may requiredrying at 165C is uranyl peroxide.Other concentr
8、ates,such asU3O8,UO2,and UO3are generally dried at 110C.4.2 Aweighed portion of uranium ore concentrate sample isplaced into an oven that is capable of maintaining a tempera-ture of 110 or 165C.The sample is heated and weighedperiodically to a constant weight or an insignificant change inweight.4.3
9、A weight change that is insignificant would be definedby the sample size and the required precision.5.Significance and Use5.1 The test method within this standard is used to demon-strate uranium ore-concentrate material meets the moisturespecification defined in Specification C967 or other applicabl
10、erequirements.6.Safety Precautions6.1 Proper precautions should be taken to prevent inhalationor ingestion of uranium-ore concentrate during ore evaluation,sample preparation,sample analysis,and sample packaging.Precautions used to prevent inhalation or ingestion shouldinclude a ventilation system a
11、nd personal protective equip-ment.Generally the ventilation system is in the form oflaboratory hoods with a dust collection system.Personalprotective equipment used should be a respirator designed forparticulate matter.7.Apparatus7.1 Drying Oven,capable of maintaining 110 or 165C.7.2 Desiccator.7.3
12、Vacuum Pump,capable of reducing pressure by 34 kPa(5 psi)(25 cm of mercury).7.4 Weighing trays.7.5 Pulverizer.7.6 Blender.7.7 Balance,3000 g capacity,readable to at least 0.1 g.1This test method is under the jurisdiction ofASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of S
13、ubcommittee C26.05 on Methods ofTest.Current edition approved Dec.15,2016.Published January 2017.DOI:10.1520/C1843-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the
14、 standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.8 Sample Jars,glass with metal lids,able to hold 150 g oras agreed upon.7.9 Test Sieve,0.177 mm(U.S.Sieve 80 mesh).7.10 Test Sieve,0.149
15、 mm(U.S.Sieve 100 mesh).NOTE1See Specification E11.7.11 Flat Iron,able to heat sample jar lids to 82C.8.Reagents8.1 Anhydrous Calcium Sulfate or equivalent.9.Sample Size9.1 The sample size will be determined by the samplecollected from Practice C1075.This standard practice shouldgenerate a sample of
16、 at least 1300 g or 0.01%of the UOC bulkshipment,depending on which sampling method is used.NOTE2A smaller sample size may be used as long as the laboratorycan demonstrate performance characteristics agreed upon by the buyer andseller.10.UOC Evaluation10.1 The primary objective is to establish the relationshipbetween the UOC sample and the dry UOC.If Practice C1075was followed for sampling,then 7 UOC samples of approxi-mately 1300 g each will be provided from the secondarysample drum for the tes
