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Use of Torque Wrench to Determine Load in Roof Bolts
Anthony J. Barry
M. M. Fine
Donald W. Frommer
Rollien Raymond Wells
Louis Anthony Panek
John A. McCormick
其他書名
Slotted-type bolts
出版
U.S. Department of the Interior, Bureau of Mines
, 1953
URL
http://books.google.com.hk/books?id=7-HhxUeub80C&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
The investigation reported in this paper is one of several included in a broad program of developing new or improved concentration processes for the oxidized and partly oxidized deposits of lead and zinc. A sample from the Playter lease, Newton County, Mo., containing pyromorphite was successfully concentrated by fatty acid flotation to a grade of over 62 percent lead. Owing to the presence of a high content of slime-size values, the overall recovery of lead at that grade was limited to 44 percent.