| 摘要 |
1,224,582. Mineral-mining. WOODS RESEARCH & DEVELOPMENT CORP. 15 April, 1969 [16 April, 1968], No 19262/69. Heading E1F. [Also in Divisions C5, C7 and H1] A mineral or a derivative of the mineral is recovered from an earth formation by directing a laser beam on to the formation to vaporize the mineral, controlling the atmosphere about, the face which the laser beam contacts, and recovering the. mineral or derivative from the controlled; atmosphere. The mineral, which may be pyrolized by the laser . beam, may be oil shale or low, grade coal, or petroleum or a metal ore and the laser beam. may be directed onto an exposed face or produce .a hole in the earth to reach the working face The controlled atmosphere may be an: inert gas, e.g. He, N 2 , A, Ne Kr, CO 2 , or a reactive one, e.g. NH 3 , Br, I, Cl, N 2 O, NO, and may be circulated by a pump throughan, enclosure constructed over the source of the laser beam The circuit includes, a separator, for recovering the mineral &c:; e.g'. a fractionation column. |
