. Transactions. W. Gordon, chief consulting engineer, the slag-tester described here. Fig. 1, was developed for the purpose of makingdeterminations of • slag-running temperatures that were accu-rate. The apparatus as designed proved neat and serviceable,and gave results directly applicable to large scale work. Round bars of Acheson graphite 4 in. in diameter were cutin lengths, with a narrow slot f in. wide and in. high ^ Tranmctions of the American Electrochemical Society, vol. v., p. 211 (April, 1904). THE EFFECT OF ALUMINA IN BLAST-FURNACE SLAGS. 141 cut in the bottom. A
. Transactions. W. Gordon, chief consulting engineer, the slag-tester described here. Fig. 1, was developed for the purpose of makingdeterminations of • slag-running temperatures that were accu-rate. The apparatus as designed proved neat and serviceable,and gave results directly applicable to large scale work. Round bars of Acheson graphite 4 in. in diameter were cutin lengths, with a narrow slot f in. wide and in. high ^ Tranmctions of the American Electrochemical Society, vol. v., p. 211 (April, 1904). THE EFFECT OF ALUMINA IN BLAST-FURNACE SLAGS. 141 cut in the bottom. A machined drilled 1-in. hole was made inthe top to the depth of 1 in. A gV^^- l^ole was continued to thenarrow slot. A horizontal 1-in. hole was drilled above the line of thelower slot so as to receive a Le Chatelier pyrometer at a pointas near as possible to the /^^n. dripping-hole. The upperhole was filled with small proportions of the formed slag orslag-making materials. The entire apparatus was placed in a. ^?ir-i—[ L 7/iD SECTION A-B SECTION C-D Fig. 1.—Slag-Tester. Plan and Sections. special oil-fired experimental reverberatory furnace, the hearthof which was covered with a layer of sand, and the pyrometerwas inserted through a hole in one side of the furnace. When the slag reached the dripping-point, and droppedor ran through the slot, depending on its viscosity, it could beviewed directly through the slot by means of an observing-holein the side of the furnace opposite the pyrometer-hole, and itsdripping- or running-point determined. The accuracy of the 142 THE EFFECT OF ALUMINA IN BLAST-FURNACE SLAGS. results was increased by the fact that the pyrometer couplewas so close to the slag at this critical temperature. Eventhough slag is a poor conductor of heat, Acheson graphite isso good a one that the temperature gradient is email. A check on the pyrometer was secured l)y boring a secondhole in. in diameter in the top, in which 5 g. of zinc wereput. The zinc was
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
