Application of a geochemical model to the prediction of the chemistry of extracts from non-recarbonated and recarbonated spent shales

Technical Report · Fri Sep 01 04:00:00 EDT 1989

OSTI ID:6198290

Reddy, K J; Hasfurther, V R ^[1]; Drever, J I ^[2]

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1. Wyoming Univ., Laramie, WY (USA). Wyoming Water Research Center
2. Western Research Inst., Laramie, WY (USA)

The chemistry of extracts from spent shale disposal environments is controlled by a number of chemical processes including the formation of inorganic complexes and precipitation-dissolution reactions. The objectives of this study were (1) to alter the data base of a geochemical code by including data for different solution species and solid phases that are important to spent shale environments and (2) to predict the chemistry of extracts from non-recarbonated and recarbonated spent shales by evaluating the solid phases controlling the solubilities of major elements such as calcium and magnesium, and trace elements like fluorine and molybdenum. The geochemical code used for this study was the GEOCHEM model. The data base of this code was altered using updated association constants and solubility products for different elements that the authors and others have developed. Three spent shale samples (PPP3, PPP6, and Lurgi) were recarbonated under slightly elevated CO{sub 2} pressure in a specially designed chamber. The non-recarbonated and recarbonated samples were subjected to solubility studies. The total element concentrations and pH of extracts were used as input to the GEOCHEM code to predict the chemistry. The model predicted that silicate phases (produced during the heating process) initially buffered the pH and controlled Ca{sup 2+} and Mg{sup 2+} concentrations in extracts. The GEOCHEM model predicted that after recarbonation, the Ca{sup 2+} concentrations are controlled by calcite. The F{sup {minus}} concentrations in extracts from non-recarbonated and recarbonated spent shales are controlled by fluorite. Further, GEOCHEM predicted that powellite does not control the solubility of molybdenum in non-recarbonated recarbonated spent shale extracts. 27 refs., 1 fig., 2 tabs.

• Research Organization: Western Research Inst., Laramie, WY (USA)
• Sponsoring Organization: DOE/FE
• DOE Contract Number: FC21-86MC11076
• OSTI ID: 6198290
• Report Number(s): DOE/MC/11076-2887; ON: DE90015323
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
041000* -- Oil Shales & Tar Sands-- Environmental Aspects
ABSORPTION SPECTROSCOPY
ADSORPTION
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
BUFFERS
CALCITE
CALCIUM
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
COMPUTER CODES
DISPERSIONS
DISSOLUTION
ELEMENTS
EMISSION SPECTROSCOPY
ENVIRONMENTAL IMPACTS
FLUORIDES
FLUORINE
FLUORINE COMPOUNDS
FLUORITE
G CODES
GEOCHEMISTRY
GROUND DISPOSAL
GROUND WATER
HALIDE MINERALS
HALIDES
HALOGEN COMPOUNDS
HALOGENS
HYDROGEN COMPOUNDS
ION SELECTIVE ELECTRODE ANALYSIS
LEACHATES
LEACHING
LURGI-RUHRGAS PROCESS
MAGNESIUM
MANAGEMENT
METALS
MINERALS
MIXTURES
MOLYBDENUM
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARAHO PROCESS
PH VALUE
POTASSIUM
SEMIMETALS
SEPARATION PROCESSES
SILICATES
SILICON
SILICON COMPOUNDS
SODIUM
SOLUBILITY
SOLUTIONS
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SPENT SHALES
SURFACE PROPERTIES
TRACE AMOUNTS
TRANSITION ELEMENTS
WASTE DISPOSAL
WASTE MANAGEMENT
WATER