Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1979-12-07
1982-03-23
Pate, III, William F.
Hydraulic and earth engineering
Earth treatment or control
Chemical
299 2, 299 11, 106100, 106103, E21C 4110
Patent
active
043209947
ABSTRACT:
A process for the preparation of grout from burned shale by treating the burned shale in steam at approximately 700.degree. C. to maximize the production of the materials alite and larnite. Oil shale removed to the surface during the preparation of an in-situ retort is first retorted on the surface and then the carbon is burned off, leaving burned shale. The burned shale is treated in steam at approximately 700.degree. C. for about 70 minutes. The treated shale is then ground and mixed with water to produce a grout which is pumped into an abandoned, processed in-situ retort, flowing into the void spaces and then bonding up to form a rigid, solidified mass which prevents surface subsidence and leaching of the spent shale by ground water.
REFERENCES:
patent: 2434815 (1948-01-01), Shaw
patent: 3459003 (1969-08-01), O'Neal
patent: 4131416 (1978-12-01), Watson et al.
patent: 4198097 (1980-04-01), Fondriest
"Effects of Gas Environment on Mineral Reactions in Colorado Oil Shale", Burnham et al., UCRL 81951, 12-7-1978.
"Disposal of Spent Shale Ash in In Situ Retorted Caverns" Nevens et al., May 1977.
Besha Richard G.
Carnahan L. E.
Denny James E.
Pate III William F.
The United States of America as represented by the United States
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