"The use of a rod mill for producing manufactured sand is not a recent application. A Marcy Open End Rod Mill has been operating at the plant of the Sun Sand Company, Thayer, West Virginia, since 1925. In early 1940 an 8' x 12' rod mill of the open end type was installed at Shasta. Dam, near Redding, California for sand production. In 1942 work began on Fontana Dam, a Tennessee Valley Authority Project on the Little Tennessee River. The flow sheet included two 9' x 12' high discharge rod mills driven by a single 800 H.P. motor. All of these installations involved the application of a standard piece of ore dressing equipment in a new field.
Various writers in technical and trade journals have urged that the sand and gravel industry adopt some of the tools used in ore dressing by the mining fraternity. A few of these tools have come into widespread use. These include the classifier, hydroseparator and the sizer. In the case of the rod mill, the need was apparent but the existing machines were not mechanically designed for the work.
As more stringent specifications for concrete sand went into effect after the war and as more large dams were planned in areas devoid of natural sand it became necessary for contractors to look for a new and more economical means of producing sand. The problem first became acute in 1946 when several large West Coast aggregate and sand producers had accumulated enormous stockpiles of several million tons of unsaleable pea gravel. It reached even more serious proportions in 1947 when three large government dams were approved for construction at sites where no natural sand was available and where the nearest sources clearly indicated an excessive freight rate.
Since The Mine and Smelter Supply Company had most of what little experience there was in sand manufacturing with rod mills, company engineers were consulted in 1946 by one of the large West Coast producer. This resulted in the application of the center discharge rod mill in the sand manufacturing field"--Introduction, pages 1-2.
Schlechten, Albert Wilbur
Materials Science and Engineering
Professional Degree in Metallurgical Engineering
Missouri School of Mines and Metallurgy
iii, 53 pages
© 1950 David Porter Hale, Jr., All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Milling machinery -- Design and construction
Sand and gravel industry -- United States
Size reduction of materials
Print OCLC #
Electronic OCLC #
Link to Catalog Recordhttp://laurel.lso.missouri.edu/record=b1068328~S5
Hale, David Porter, "Development, application and operating results of the center peripheral discharge rod mill" (1950). Professional Degree Theses. 131.