Génie chimique Ron ou autre métal qui ne se combinera pas avec le barbide dans la partie inférieure de la chambre du four. Dans ce cas, on dit que le molteniron purifie le carbure en retirant le silicium qui est l'un des impuritiséties normales du carbure, ce qui signifie que le fer est transformé en ferro-silicium. Le four est illustré en coupe verticale à la Fig.2. Il comprend un verticalSlack avec une Imdy i de matériau re-fractoire, telle asmagnésie ou siloxicon firelirick, entouré de ?.water-veste et supportedupon une plaque en acier moulé, avec chambre de refroidissement et terme électrique

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Chemical engineering . ron or other metal which will not combine with thecarbide in the lower part of the furnace chamber. The molteniron in that case is stated to purify the carbide by withdrawingthe silicon from it. which latter is one of the normal impuritiesin carbide, by which means the iron is converted into ferro-silicon. The furnace is shown in vertical cross-section in Fig.2. It comprises a verticalslack with a Imdy I of re-fractory material, such asmagnesia or siloxicon firelirick, surrounded by ?.water-jacket and supportedupon a cast-steel plate, with cooling chamber andelectric terminal. The up-per electrode is supportedupon this body and insu-lated from it by a layer ofnon-conducting refractorymaterial. It is constitutedby an iron ring, sur-mounted by a water-jacket, the inner snrf.iceof the ring being bare, inorder to insure contactwith the charge. Bell andhopper and outlet flue areprovided as usual, in aniron ring, vshich covers the top ofthe operation is started, themixture of lime and carbon. FIG. J.—PKICE C.KBlliE HKNAlE. the furnace. Whenfurnace is filled with auntil its upper portion liesin contact with the electrode ring, initial current pathsiKing provided if the charge is normally a poor conduc-tor. The conductivity of the charge may be increased byusing a mixture containing large pieces of coke, which liein contact with each other at various points, and thus furnishdirect paths for the current. A current of sufficient amperageis then passed, the temperature in the charge rising graduallydownwardly on account of the decreasing cross-section of thefurnace, down to a zone where the materials react to formcarbide and the latter is brought into a molten condition. Innormal operation the major portion of the body of iron willl)e maintained in a molten condition by the heat of the charge, the lower portion being pasty or solid, owing to the influenceof the cooling water. The molten carbide accumulating uponthe iron is intermittently or continuously

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