1、Designation:E150608Standard Test Methods forAnalysis of Acid-Grade Calcium Fluoride(Fluorspar)1This standard is issued under the fixed designation E1506;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These test methods cover the chemical analyses ofacid-grade calcium fluoride(fluorspar).These test methodsappear in the following sections:Sec
3、tionsVolatiles as Moisture6 13Silica14 22Assay as Calcium Fluoride(CaF2)23 32Soluble Chloride as NaC133 50Calcium Carbonate51 59Phosphorus60 69Arsenic70 78Mixed Oxides(R2O3)79 87Sulfide Sulfur88 961.2 The values stated in SI units are to be regarded as thestandard.No other units of measurement are i
4、ncluded in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior t
5、o use.1.4 Review the current Material Safety Data Sheet(MSDS)for each chemical used in this standard for detailed informationconcerning toxicity,first-aid procedures,handling,and safetyprecautions.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE180 Practice for Determ
6、ining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)3E300 Practice for Sampling Industrial Chemicals3.Significance and Use3.1 Calcium fluoride is available in nature in various formsand purities.A major use for it is in the manufacture of
7、hydrofluoric acid.The test methods listed in 1.1 provideprocedures for analyzing calcium fluoride to determinewhether it is suitable for this use.4.Reagents4.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform
8、 to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the det
9、ermination.4.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean Type II or Type IIIreagent water conforming to Specification D1193.5.Sampling5.1 Sampling of calcium fluoride is not within the scope ofthese test methods.See the appropriate sections of PracticeE
10、300 for sampling procedures.VOLATILES AS MOISTURE6.Scope6.1 This test method covers the determination of volatiles aspercent moisture.7.Summary of Test Method7.1 The sample is dried in an air oven at 105 to 110C,andthe mass loss is calculated as percent moisture.8.Apparatus8.1 Top-Loading Balance,ca
11、pable of weighing 1000 g tothe nearest 0.01 g.1These test methods are under the jurisdiction of ASTM Committee E15 onIndustrial and Specialty Chemicalsand are the direct responsibility of SubcommitteeE15.02 on Product Standards.Current edition approved Dec.15,2008.Published January 2009.Originallyap
12、proved in 1994.Last previous edition approved in 2003 as E1506 97(2003).DOI:10.1520/E1506-08.2For 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 standards Document Summa
13、ry page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see
14、Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box
15、 C700,West Conshohocken,PA 19428-2959.United States1 8.2 Sample Pan,stainless steel or borosilicate glass,152 by152 by 51 mm deep.8.3 Cooling Rack,wood or metal,able to allow circulationof air around the entire sample pan(for example,a“bakersrack”).8.4 Forced Air Oven,capable of maintaining temperat
16、uresof 105 to 110C.9.Hazards9.1 See 1.3 and 1.4.10.Procedure10.1 Tare a clean,dry sample pan to the nearest 0.01 g.10.2 Add approximately 1000 g of representative sample tothe pan and spread evenly.Wipe all external surfaces of the panfree of sample.Weigh again to the nearest 0.01 g.10.3 Place the pan containing the sample in an air oven at105 to 110C for a minimum of 12 h.10.4 Remove the pan from the oven and place on a coolingrack for 1 h.10.5 Weigh the cooled pan to the nearest 0.01 g.10.6 Re
