1、Designation: E382 12Standard Test Method forDetermination of Crushing Strength of Iron Ore Pellets1This standard is issued under the fixed designation E382; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、 A 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 describes a method for determining thecrushing strength of fired iron ore pellets. Cylindrical agglom-erates, briqu
3、ettes, and reduced pellets are not covered by thistest method.1.2 The values as stated in SI units are to be regarded as thestandards. The values in parentheses are given for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It
4、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 to use.2. Referenced Documents2.1 ASTM Standards:2E50 Practices for Apparatus, Reagents, and Safety Consid-erations for Chemical An
5、alysis of Metals, Ores, andRelated MaterialsE122 Practice for Calculating Sample Size to Estimate,With Specified Precision, the Average for a Characteristicof a Lot or ProcessE135 Terminology Relating to Analytical Chemistry forMetals, Ores, and Related MaterialsE389 Test Method for Particle Size or
6、 Screen Analysis atNo. 4 (4.75-mm) Sieve and Coarser for Metal-BearingOres and Related MaterialsE877 Practice for Sampling and Sample Preparation of IronOres and Related Materials for Determination of ChemicalComposition3. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod, r
7、efer to Terminology E135.3.2 Descriptions of Terms Specific to this Standard3.2.1 crushing strength, naverage compressive loadneeded to break the pellets in the test sample completely.4. Summary of Test Method4.1 A load is applied on a single pellet at a specified speedof the compressive platen unti
8、l the pellet is broken. Thisprocedure is repeated on all pellets of the test sample.5. Significance and Use5.1 The crushing strength aids the pellet producer in thedetermination of quality problems associated with the produc-tion of pellets.5.2 The crushing strength is often used by the pelletconsum
9、er as a quality indicator for performance in the blastfurnace.6. Apparatus6.1 Loading Unit:6.1.1 The loading capacity shall be 1000 kgf or more (1000kgf = 9.806 kN).6.1.2 The compressive platens shall be installed in parallelplanes. The surface of the platens that are in contact with thesample shall
10、 be made of surface-hardened steel.6.1.3 A device for setting the speed of the compressiveplaten at 0.25 mm/s 6 0.08 mm/s over the entire test periodshall be used.NOTE 1If the platen speed is not constant during the test cycle, resultsmay differ depending upon the test machine used.6.2 Indicating Un
11、it, consists of a load transfer device and aload indicator.6.2.1 Load Transfer Device:6.2.1.1 The transfer of the applied load to the load indicatorshall be by a load cell or by a lever.6.2.1.2 The capacity of the load cell shall be at least 1000kg.6.2.2 Load Indicator:1This test method is under the
12、 jurisdiction of ASTM Committee E01 onAnalytical Chemistry for Metals, Ores, and Related Materials and is the directresponsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-lurgical Materials.Current edition approved June 1, 2012. Published July 2012. Originally approvedin 1968
13、. Last previous edition approved in 2007 as E382 07. DOI: 10.1520/E0382-12.2For 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 Summary page onthe
14、 ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2.2.1 The applied load shall be indicated either by anelectric indicator (recording chart, meter with needle rider, orother suitable device) for the load cell type, or b
15、y a mechanicalindicator (gage equipped with needle rider or other suitabledevice) for the lever type.6.2.2.2 When using a load cell, the chart recorder responsetime shall be 1.0 s or less for a full-scale deflection.6.2.2.3 The minimum graduation shall be 1/100 of the fullscale.6.2.2.4 The testing m
16、achine shall be calibrated periodically.6.3 SievesSquare mesh sieves 12.5 mm (12 in.) and 9.5mm (38 in.) are recommended; however, others may be used inagreement between parties.7. Hazards7.1 For precautions to be observed in this method, refer toPractice E50.8. Sampling and Sample Preparation8.1 Th
17、e test sample for determining the crushing strengthshall be obtained at random by riffle division of a sample takenand prepared in accordance with Practice E877.8.2 Sixty or more pellets, or a number agreed upon betweenthe parties concerned, shall be tested for each sample.8.3 The size range of the
18、test sample shall be between 9.5mm and 12.5 mm (as determined in Test Method E389)oranysize range as agreed upon between the parties concerned.9. Procedure9.1 Place a single pellet of the sample at the approximatecenter of the surface-hardened portion of the lower platen.9.2 Apply the load at a cons
19、tant rate of 0.25 mm/s 6 0.08mm/s throughout the test period.9.3 Record the maximum load at which each test piecebreaks completely.10. Report10.1 The test report shall include the following:10.1.1 Crushing strength, expressed as the mean value, inkilogram-force, of all measurements.10.1.2 Standard d
20、eviation of the measurements.10.1.3 Size range of the pellets tested.10.1.4 Number of pellets tested.11. Precision and Bias11.1 PrecisionThe precision of this test method is depen-dent on the number of pellets selected for testing. The user isadvised to use the proper equation from Practice E122 toc
21、alculate the number of pellets to select for testing in order toachieve the desired precision.11.2 BiasNo information can be presented on the bias ofthis test method since no material having an accepted referencevalue is available.12. Keywords12.1 crushing strength; iron ore; pelletsASTM Internation
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23、own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be
24、addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards,
25、 at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E382 122
