ASTM_C_607_-_88_2016.pdf

Designation:C60788(Reapproved 2016)Standard Practice forCoking Large Shapes of Carbon-Bearing Materials1This standard is issued under the fixed designation C607;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.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 practice covers the preparation of coking ofcarbon-bearing material for subsequent testing such as modu-lus of rupture,slag testing,thermal conductivity,and thermalexpansion.Test Methods C831 is the specified method fortesting residual carbon.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 to use.2.Referenced Documents2.1 ASTM Standards:2C133 Test Methods for Cold Crushing Strength and Modu-lus of Rupture of RefractoriesC767 Test Method for Thermal Conductivity of CarbonRefractoriesC831 Test Methods for Residual Carbon,Apparent ResidualCarbon,and Apparent Carbon Yield in Coked Carbon-Containing Brick and ShapesC832 Test Method of Measuring Thermal Expansion andCreep of Refractories Under LoadC874 Test Method for Rotary Slag Testing of RefractoryMaterials3.Significance and Use3.1 This practice is useful for preparing coked specimensfor subsequent testing where the shapes desired cannot be fittedinto the coking box described in Test Methods C831.3.2 This practice can be very sensitive to heating rates incoking.Thus,strict adherence to the coking procedure isnecessary.4.Apparatus4.1 Furnace,gas-,oil-,or electric-fired,with heating cham-ber capable of receiving the coking box shown in Fig.1.4.2 Box,stainless steel,essentially as shown in Fig.1.5.Preparation of Samples5.1 Refer to the appropriate test method(s)or practice(forexample,Test Methods C133,Test Method C767,Test Meth-ods C831,Test Method C832,or Practice C874)for samplerequirements.6.Procedure6.1 Spread a 2-in.(51-mm)layer of dry metallurgical coke,passing a No.12(1.70-mm)sieve or a 10-mesh Tyler StandardSeries,over the bottom of the coking box.6.2 Push the sample tray through the coke until it rests onthe bottom.6.3 Set the specimens approximately 1 in.(25 mm)apart inthe tray,and uniformly spaced from the box sides.6.4 Place a protected thermocouple inside the box and nearthe center specimens for temperature control.6.5 Secure the lid on the box to prevent excessive leakage.6.6 Place the loaded box in the furnace heating chamberwith the nitrogen inlet,thermocouple,and outlet pipe extend-ing through a bricked-up door.6.7 Purge the coking box with nitrogen containing no morethan 10 ppm(10 mg/L)oxygen and maximum dew point of76F(60C).Thereafter,provide sufficient flow of 3 to 4 ft3/h(24 to 32 mL/s)to maintain positive pressure within the boxthroughout the entire heating and cooling period(Note 1).Ifdesired,the gases and liquids escaping from the coking boxthrough the outlet pipe may be ignited outside the furnace.NOTE1The purpose of the nitrogen is to prevent oxidation of thecarbonaceous residues within the brick.6.8 Heat the furnace so that the thermocouple within the boxregisters 250F(120C)after the first hour;then heat the1This practice is under the jurisdiction ofASTM Committee C08 on Refractoriesand is the direct responsibility of Subcommittee C08.04 on Chemical Behaviors.Current edition approved June 1,2016.Published June 2016.Originallyapproved in 1967.Last previous edition approved in 2010 as C607 88(2010)1.DOI:10.1520/C0607-88R16.2For 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 ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 furnace so that the box is heated at a rate of 400 6 20F(2206 11C)/h to 1800 6 20F(980 6 11C).6.9 Hold the temperature for 3 612h,starting from thetime 1780F(970C)is reached in the box.6.10 After completing the hold period,shut off the furnaceand allow the coking box to cool naturally within the furnace.6.11 Remove the samples from the coking box after the boxhas cooled sufficiently to handle.7.Keywords7.1 carbon yield;coking;loss of ignition;refractories;residual carbonASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validit