Abstract
Ion exchange waste solutions were treated on a pilot plant scale for the recovery of-thorium concentrates by solvent extraction with 5% di-tridecyl amine in kerosene, the extract being stripped with either sodium carbonate or sodium chloride. Recovery of thorium from solutions containing from 0.15 to 0.25 g Th02/1 was 95% or better. Extract loadings ranged from 2.0 to 2.5 g Th02/1. Final products analysing 98% Th02 or better were obtained, which were found acceptable for the production of alloying grade thorium metal by the calcium reduction process. Reagent costs, including solvent losses, varied from 39 cents per lb Th02 for the chloride strip procedure to 47 cents per lb Th02 for the carbonate strip procedure.
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