Metallurgy a Brief Outline of the Modern Processes for Extracting the More Impo
Metallurgy a Brief Outline of the Modern Processes for Extracting the More Impo
W Wilhelm Borchers
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They are usually of trapezoidal cross-section with from 2 to 8 tuyeres on one side of the trapezoid. Of these furnaces the Stolberg furnace has been most widely adopted and was FIG. 144. Pilz-Freiberg. FIG. 145. Upper Harz. FIG. 146. Allis-Chalmers. also used until recently in Freiburg. They are still in operation at the lead plants in Stolberg and Mechernich. " HOCHOFEN. " Although the name is usually applied to blast furnaces having at least 13 ft. Between the tuyere level and throat, shorter... furnaces of this type are found in some lead plants. Modern blast furnaces are built with circular and rect- angular horizontal cross-sections (Figs. 144-147). The shaft is usually made of brick and the bosh and smelting zone are water-jacketed. The throat is open, except during blowing in and blowing out, when it is covered with a LEAD 129 hood. Downcomers start from the centre of the throat or from the side under the feed floor. They are usually FlG. 147. North American Water-jacket Furnace. Scale, i : 150.
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