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Schechter, Robert S.

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 had little effect on uranium leaching, but the leaching rate depended on oxidant concentration to one -half 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...
Tags: Pyrite, Uranium
This report describes the development and application of PHASEQ/FLOW, a geochemical flow simulator capable of describing the dynamic changes in chemical composition of an aqueous solution during flow in a permeable medium. The solution components can react through intraaqueous reactions, redox, precipitation, or dissolution. The assumption of local thermodynamic equilibrium ensures maximum generality with respect to the number of species and components possible; however, the fluid flow itself is limited to one - dimension. The report describes several applications: generic batch equilibria, flowing equilibria, uranium roll -front deposition, and roll-front leaching.
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