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 35
st diameter is about 20 feet,and the height about 25 feet. Air is admitted through holesin the brickwork near the base, as shown in Fig. 2. The oreremains in the kiln from two to three days, and about 1 hun-dredweight of small coal is burnt to each ton of ore. Theeffect of calcination upon the ore… … SupportingPillars.—^1 Fig. 2.—Calcinator. matter in the ore. Moisture and carbon dioxide are alsoremoved by this treatment. Black-band ironstones oftencontain enough carbonaceous matter to effect calcinationwithout the application of any fuel other than that necessaryto start com±bustion. The…
Metal-work
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