Kinetics of decomposition of Colorado oil shale. II. Carbonate minerals

Technical Report · Mon Mar 13 04:00:00 EST 1978

OSTI ID:6869479

Campbell, J H

The kinetics of decomposition of nahcolite, dawsonite, dolomite, and calcite in oil shale have been investigated using heating rates expected during typical combustion retorting. Furthermore, the rates of decomposition of calcite and dolomite in shale have been studied over a range of heating conditions from 2 to 20/sup 0/C/min and CO/sub 2/ partial pressures of 0 to 1.0 atm. These results lead to the conclusion that, under typical combustion retorting conditions, most of the calcite reacts with SiO/sub 2/, rather than decomposing to CaO. Activation energies and preexponential factors characterizing the rate constants for the above reactions are also given; these ''engineering'' rate data are expressed in a form amenable for use in mathematical models of the retorting process. Also presented are x-ray data on the final product mineral phases in fully burned oil shale. These are found to be mainly members of the akermanite-gehlenite series and diopside. These products are formed from reactions in the solid state of the carbonates and/or their oxides with other minerals in the shale. A summary of enthalpy data for these reactions is given. Finally, the practical implications and limitations of these results for computational and experimental studies of large-scale shale combustion retorting processes are discussed. Included in this discussion are recent results showing the effects of steam on the mineral reactions in shale.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6869479
• Report Number(s): UCRL-52089(Pt.2)
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040402* -- Oil Shales & Tar Sands-- Surface Methods
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BITUMINOUS MATERIALS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
DAWSONITE
DECOMPOSITION
DOLOMITE
ENERGY SOURCES
ENTHALPY
FORMATION HEAT
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
NAHCOLITE
OIL SHALES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION HEAT
REACTION KINETICS
RESERVOIR ROCK
RETORTING
ROCKS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM MINERALS
STEAM
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES