Geology and Mineral Resources of Mississippi

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U.S. Government Printing Office, 1906 - 99 Seiten
 

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Seite 72 - F., and must therefore be carried on in kilns of special design and lining. During the burning, combination of the lime with silica, alumina, and iron oxide takes place. The product of the burning is a semifused mass called "clinker," which consists of silicates, aluminates, and ferrites of lime in certain fairly definite proportions.
Seite 73 - ... the amount of heat necessary to raise the temperature of 1 pound of water 1 degree Fahrenheit.
Seite 73 - The more important of these factors are: 1. Chemical composition of the material. 2. Physical character of the material. 3. Amount of material available. 4. Location of the deposit with respect to transportation routes. 5. Location of the deposit with respect to fuel supplies.
Seite 74 - A Portland cement plant running on dry raw materials, such as a mixture of limestone and shale, will use approximately 20,000 tons of raw material a year per kiln. Of this about 15,000 tons are limestone and 5,000 tons shale. Assuming that the limestone weighs 160...
Seite 73 - The almost infinite number of raw materials which are theoretically available are. however, reduced to a very few under existing commercial conditions. The necessity for making the mixture as cheaply as possible rules out of consideration a large number of materials which would be considered available if chemical composition was the only thing to be taken into account. Some materials, otherwise suitable, are too...
Seite 78 - SCHRADER, FC, and SPENCER, AC The geology and mineral resources of a portion of the Copper River district, Alaska.
Seite 24 - British thermal unit (BTU) is the amount of heat required to raise the temperature of 1 pound of water 1° F.
Seite 47 - Delta-plain of the Mississippi, but also higher up, perhaps as far as Memphis, and all along the gulf coast, at least from Mobile on the east to the Sabine river. Wherever circumstances allow, the overlying clay stratum No. 2, is also observed.
Seite 74 - ... year. As the shale or clay may be assumed to contain considerable water, a cubic foot will probably contain not over 125 pounds of dry material, SO that each kiln will also require about 80,000 cubic feet of shale or clay. A cement plant is an expensive undertaking, and it would be folly to locate one with less than twenty years' supply of raw material in sight.
Seite 73 - In certain localities deposits of argillaceous (clayey) limestone or "cement rock" occur in which the lime, silica, alumina, and iron oxide exist in so nearly the proper proportions that only a relatively small amount (say 10 per cent) of other material is required in order to make a mixture of correct composition. In the majority of plants, however, most or all of the necessary lime is furnished by one raw material, while the silica, alumina, and iron oxide are largely or entirely derived from another....