Preparation of grout for stabilization of abandoned in-situ oil shale retorts
- Livermore, CA
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4320994
- OSTI ID:
- 864159
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
grout
stabilization
abandoned
in-situ
oil
shale
retorts
process
burned
treating
steam
approximately
700
degree
maximize
production
materials
alite
larnite
removed
surface
retort
retorted
carbon
leaving
treated
70
minutes
ground
mixed
water
produce
pumped
processed
flowing
void
spaces
bonding
form
rigid
solidified
mass
prevents
subsidence
leaching
spent
shale retorts
ground water
situ oil
shale retort
oil shale
spent shale
void space
burned shale
situ retort
surface subsidence
prevents surface
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