Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1978-01-23
1979-10-16
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
299 4, E21B 4328, E21C 4110
Patent
active
041711467
ABSTRACT:
A fragmented permeable mass of formation particles containing oil shale and carbonates of calcium and magnesium is formed in an in situ oil shale retort. A combustion zone is advanced through the fragmented mass, whereby kerogen in oil shale in the fragmented mass is decomposed in a retorting zone on the advancing side of the combustion zone to produce gaseous and liquid products including shale oil, and particles containing retorted oil shale are combusted for converting magnesium values to more leachable form such as magnesium oxide. Magnesium values are leached from the combusted particles selectively with respect to calcium compounds and silicates with aqueous solutions of a purgeable, acid-forming gas such as carbon dioxide or sulfur dioxide. An enriched solution containing magnesium values is withdrawn from the fragmented mass and magnesia is recovered from such enriched solution.
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U.S. Dept. Interior, Bureau of Mines Tech. Paper 684, H. A. Dorner et al., 1946.
Occidental Research Corporation
Purser Ernest R.
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