A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . Fig. 229.—Coffee MillCracker. {See />. 712.) CEMENT MANUFACTURE 713 ground stone at this point is such that 90% to 95% or even a higher per-centage will pass a screen having 100 meshes to the linear inch. Finegrinding before burning is one of the secrets of successful manufacture., The best type of rotary kiln (see Fig. 231) used for calcining dry;-natetials, consists of an inclined steel tube from 60 to 200 feet diameter is generally 6 to 12 feet, thoug
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . Fig. 229.—Coffee MillCracker. {See />. 712.) CEMENT MANUFACTURE 713 ground stone at this point is such that 90% to 95% or even a higher per-centage will pass a screen having 100 meshes to the linear inch. Finegrinding before burning is one of the secrets of successful manufacture., The best type of rotary kiln (see Fig. 231) used for calcining dry;-natetials, consists of an inclined steel tube from 60 to 200 feet diameter is generally 6 to 12 feet, though occasionally smaller than thist the upper end and tapering to the larger size at a point about one-. FiG. 230.—Tandem Automatic Weighing Machine. (.Siy [>. 712.) third of its length from the upper end. The Uning may be of U-shapedfire-brick in order to present, as a non-conductor of heat, a hollow sur-face against the shell of the rotary. The lower end of the rotary isclosed by a stationary brick wall, and through the center of this passesa pipe which feeds the petroleum, or more frequently the powderedcoal which in a separate building is crushed to pea size and pulverized intube mills, or other pulverizing machines, so that about 90% passes a 100-mesh screen; the finer the coal the greater its efSciency. The ground stone may be fed into the upper end of the rotary by a spiralconveyor enclosed in a pipe which is water-jacketed so that the materialwill not cake. The degree of calcination is governed by the supply of rawmaterial, the speed of rotation of the rotary, which rests on rollers gearedto a speed-changing device, and the quantity of fuel. If coal is used forfuel, it is fe
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