Abstract
The Amex processes use long-chain alkyl amines for solvent extraction separation of thoriuin and by-products from ore sulfate liquors. Because the extraction power for thorium, uranium, and rare earths depends on ainine class and alkyl structure, appropriate choice of amine allows separate recovery of these metals in multicycle operations. Chloride, nitrate. and carbonate solutions strip extracted metals from the amine. Thorium recovery was>99.8% with four stages of recovery. (auth)
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