Chemical engineering . se tubes, whichis more or less granular according to the fineness of the rawmaterial used, may be smoothed down by progressively heat-ing it in the electric arc from end to end. The method forthe production of a plate or a slab of fused quartz consistsin the heating of a perforated plate of carbon, upon the faceof which a layer of granulated quartz has been placed, by aheavy current. After the mass has cooled, the plate of fusedquartz may be removed, and its smoothed off by theelectric arc. .\ series of devices are described in the specifica-tion for the product
Chemical engineering . se tubes, whichis more or less granular according to the fineness of the rawmaterial used, may be smoothed down by progressively heat-ing it in the electric arc from end to end. The method forthe production of a plate or a slab of fused quartz consistsin the heating of a perforated plate of carbon, upon the faceof which a layer of granulated quartz has been placed, by aheavy current. After the mass has cooled, the plate of fusedquartz may be removed, and its smoothed off by theelectric arc. .\ series of devices are described in the specifica-tion for the production of more complicated of Metallic Magnesium.—T. L. Roberts, New York. Patent December 27. 1904. .Application filed May 31, process is carried out in a vessel shown in cross-sectionin Fig. I. It consists of an iron pot A, which is set into a ,- n fit r, ir.(,i.,rv inntrrinl -uirl lifntcd from the outside bv ELECTKOCHKMICAL AXU METALLLRGICAL JNUUSTRY. [Vol. III. No. FIG. I.—.\PP.\R.\ FOR PRODUC- Tlnx OF MET.\LLIC M.\G- NESIUM. means ol a burner C. It is covered with a slab of slate with an opening E through which the anode rod Gof carbon is introduced. The vessel itself constitutes thecathode. An aperture H in the lid serves for feeding theelectrolyte, while a tube -V is provided for carrying off thegases generated during electrolysis. A draw-off tube O isused to remove the molten metal, which accumulates on thesurface of the bath. During this operation, of course, theheating arrangement has to be withdrawn. Another draw-offcock /, at the bottom of the vessel, serves for the withdrawalof the contents of the pot: the cock may be used for with-drawal of the metal, if the electrolyte is of such low specificgravity that the metal will sink to the bottom. .\ ring K. ofnon-conducting material, pref-erably porcelain, is used to keepthe magnesium, which risesalong the sides of the vessel,from coming into contact w
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
