Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 73
andcalamine (zinc carbonate, ZnCog). The ore is first roasted in order to drive off the carbonicacid and water, and in the case of blende to convert the sul-phides into oxides. Zinc is one of the few metals which areobtained by distillation. The process now almost universally 56 METAL-WORK adopted… … Fig. 16.—Zinc Distillation Furnace (Regenerative Type). about 40 pounds of the mixture. These retorts are made offireclay, and forty to sixty are accommodated in each furnace(Figs. 16 and 17). The furnace consists of a vertical chamber,open at the front, with an arched roof. The back of the…
Metal-work
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