Extraction of inorganic chemical constituents from retorted oil shale by complexometric agents

Technical Report · Sun Sep 01 04:00:00 EDT 1985

OSTI ID:5597040

Essington, M E; Carroll, R B

Synthetic leachate solutions containing complexometric agents were used to simulate the long-term release of trace metals, carbonates, and sulfates from indirectly retorted (IH) and directly retorted (DH) oil shale. This approach was also taken to accelerate the leaching process in a lab scale/real time leach test which would approach the maximum potential release of chemical constituents. The complexometric agents examined were acetate, oxalate, and citrate ions, and EDTA and DTPA. Retorted oil shales were also extracted with distilled-deionized water. Leachate samples were analyzed for silver, arsenic, boron, barium, cadmium, chromium, copper, iron, mercury, molybdenum, nickel, lead, antimony, selenium, vanadium, zinc, fluorine, carbonate, and sulfate. For the indirectly retorted oil shale, maximum metallic element leachability was observed with EDTA and DTPA. In general, as the length of extraction period increased so did metal extractability. The DH sample, composed mineralogically of a number of high-temperature alteration products, produced higher leachate pH and electrical conductivity values. This was attributed to the instability of high-temperature mineral phases at low temperatures and pressures. Oxalate, in addition to EDTA and DTPA, was found to affect a high trace metal solubility. The extractability of trace metallic elements from DH, however, was lower than that for IH, thus illustrating the insolubility of metallic element-bearing minerals at high pH and the ability of ionic species released from DH to form sparingly soluble solids with trace metallic elements. 29 refs., 12 figs., 16 tabs.

• Research Organization: Western Research Inst., Laramie, WY (USA)
• DOE Contract Number: FC21-83FE60177
• OSTI ID: 5597040
• Report Number(s): DOE/FE/60177-2152; WRI-86-021M; ON: DE86014286
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040500 -- Oil Shales & Tar Sands-- Properties & Composition
040900* -- Oil Shales & Tar Sands-- Waste management
ACETATES
ALKALINE EARTH METALS
AMINO ACIDS
ANTIMONY
ARSENIC
BARIUM
BORON
CADMIUM
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMIUM
CITRATES
COPPER
DATA
DISPERSIONS
DISSOLUTION
DRUGS
DTPA
EDTA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
FLUORINE
HALOGENS
HYDROGEN COMPOUNDS
INFORMATION
IRON
LEACHATES
LEACHING
LEAD
MERCURY
METALS
MIXTURES
MOLYBDENUM
NICKEL
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALATES
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
RADIOPROTECTIVE SUBSTANCES
SELENIUM
SEMIMETALS
SEPARATION PROCESSES
SILVER
SOLUTIONS
SPENT SHALES
SULFATES
SULFUR COMPOUNDS
TRACE AMOUNTS
TRANSITION ELEMENTS
VANADIUM
WATER
ZINC