登入
選單
返回
Google圖書搜尋
Electrothermal Fracture of Copper Shale
Carl F. Wingquist
Robert A. Lund
出版
U.S. Department of the Interior, Bureau of Mines
, 1976
URL
http://books.google.com.hk/books?id=ZV_4CHo_2M4C&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
Electrical resistance heating to effect thermal fragmentation of semiconductive rock was examined by the Bureau of Mines. Tests were carried out on copper-bearing ores of the Nonesuch Shale Formation in the laboratory and in the field at White Pine, Mich. Fieldwork included primary and secondary breakage tests. Heating tests on in situ rock failed to produce thermal damage to an extent considered useful; however, boulders up to 30 ft3 were effectively broken by the method. Power input to the test rock was taken from a 50-kV, 5-amp dc power supply.
