1、Designation:C87411aStandard Test Method forRotary Slag Testing of Refractory Materials1This standard is issued under the fixed designation C874;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 par
2、entheses 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 procedure for comparingthe behavior of refractories to the action of molten slag in arotating test furnace.Areference mater
3、ial should be included ineach test and run for comparison.No numeric results areobtained from this test method.Numeric evaluation of testresults is the responsibility of the test operator.The test andequipment are patterned after a method developed by ValleyDolomite Corporation2.1.2 The values state
4、d 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
5、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.Significance and Use2.1 This test method outlines a procedure which,whenappropriate evaluation methods are added,can be us
6、eful in thedevelopment of new products or in the selection of products tobe used in contact with a particular slag composition.2.2 A gradient exists through the test specimens that iscontrolled by the thermal conductivity of the specimens andbackup material.The slag is constantly renewed so that a h
7、ighrate of corrosion is maintained.The flow of the slag can causemechanical erosion of materials.The tilt and rotational speedof the furnace will affect the amount of mechanical erosion.2.3 Use caution in interpreting results when materials ofvastly different types are included in a single run.Care
8、must betaken to prevent oxidation of carbon-containing materialsduring heat up;failure to do so can result in highly erraticresults.A reference refractory specimen,or specimens,shouldbe used for comparison.3.Apparatus3.1 Furnace,consisting of a cylindrical shell,typically 18in.(456 mm)long and with
9、a 10 in.(254 mm)inside diameter,mounted on rollers and motor driven.Both the rotation and tiltof the furnace along its long axis should allow for adjustment.3.2 BurnerA gas-oxygen torch capable of heating thefurnace to 3200F(1760C).The burner should be equippedwith flowmeters to monitor gas and oxyg
10、en flows.3.3 Optical Pyrometer.3.4 Tools,for(1)a means of feeding slag pellets intofurnace,and(2)to assemble and dismantle the furnace.3.5 Gas Atmosphere Analyzer and Sampling Equipment.3.6 Mold,to form plastic,castable,and rammed samples.3.7 Molds,to form slag pellets.3.8 Abrasive Saws,to cut brick
11、 samples.3.9 Supply of Granular Refractory Backup Material.3.10 Safety Equipment.4.Test Specimens4.1 Test specimens should be 9 in.(228 mm)long and havea cross section as shown in Fig.1.The 1.75 by 9 in.(44 by 228mm)face should be an original surface.4.2 One or more reference samples should be inclu
12、ded ineach test run.5.Assembly5.1 Six test specimens,as described in Section 4,shallconstitute a test lining.This lining can be assembled around ahexagonal shaped mandrel with 1.75 in.(44 mm)faces andtaped or steel-banded for subsequent handling.The liningshould be positioned midway in the 18 in.(45
13、6 mm)length ofthe shell.Any suitable granular or refractory castable materialmay be installed behind the test lining.5.2 It has been found convenient to use precast plugs to fillthe two ends of the shell.These should be 4.5 in.(114 mm)thick by 10 in.(254 mm)in diameter to fit inside the shell.Thehex
14、agonal holes in the plug should match those of the test1This test method is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.04 on ChemicalBehaviors.Current edition approved Oct.1,2011.Published November 2011.Originallyapproved in 1977.
15、Last previous edition approved in 2011 as C874 11.DOI:10.1520/C0874-11A.2Cash,P.,“Measuring Refractory Resistance to Hot Slags,”Ceramic Age,August 1966,pp.2029.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 lining.For basic slags,the plu
16、gs should be formed using a98%MgO ramming or casting mix;for acid slags,the plugsshall be formed using a+90%Al2O3ramming or casting mix.The whole assembly should be held in place by retaining ringsbolted to each end of the shell.5.3 The shell,with the test specimens in place,shall then beplaced in its cradle and linkage made to the driving motor.5.4 The gas-oxygen torch mounting should be adjustable toa position 3 to 5 in.(76 to 127 mm)from the furnace openingso as to be able to fire axially thr
