Development of environmentally attractive leachants. Volume 2. An experimental and theoretical study of uranium and pyrite dissolution kinetics. Open file report 5 June 1978-31 July 1983
This report describes the results of flow tests on the rate and ultimate yield of uranium and pyrite leaching under conditions representative of carbonate in situ uranium leaching. The effects of cation type, pH, carbonate and oxygen concentrations, and flow rate were investigated for uranium leaching. Leachant cation, pH, and carbonate concentration has little effect on uranium leaching, but the leaching rate depended on oxidant concentration to 1/2 order. The insensitivity to cation type led to a new process whereby the leach solution is preceded by a preflush containing the chloride of the leaching cation. This preflush prevented permeability losses associated with carbonate precipitation and clay swelling caused by certain cations. The effects of leachant cation, pH, carbonate and oxidant concentration, and particle size were also studied for pyrite leaching. The reaction products were elemental sulfur, thiosulfate, sulfate, and an unidentifiable sulfur species. The fate of iron was geothite, amorphous iron, oxyhydroxides, and lepidocrocite.
- Research Organization:
- Texas Univ., Austin (USA). Dept. of Petroleum Engineering
- OSTI ID:
- 6361997
- Report Number(s):
- PB-84-232669
- Resource Relation:
- Other Information: See also PB83-234997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kinetic study of pyrite oxidation in basic carbonate solutions
Soluble sulfur species extracted from coal by chemical leaching. [MS thesis; mineral and coal-derived pyrite; 114 references]
Related Subjects
PYRITE
DISSOLUTION
LEACHING
URANIUM
CARBONATES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
HYDROLOGY
MATHEMATICAL MODELS
OXIDATION
PERMEABILITY
PH VALUE
ACTINIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
IRON COMPOUNDS
IRON SULFIDES
KINETICS
METALS
MINERALS
OXYGEN COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
053000* - Nuclear Fuels- Environmental Aspects
050300 - Nuclear Fuels- Mining- (-1987)