Abstract
The reaction between thorium salts and certain dicarboxylic acids such as succinic, phthalic, and tetrachlorophthalic, proceeds extremely slowly in aqueous solution at room temperature. A visible precipitate does not form for many hours, whereas a gelatinous precipitate is obtained if the solutions are at or near boiling. When a clear solution of thorium and a dicarboxylic acid are warmed to 70 to 85/sup 0/C, with continuous stirring, a thorium salt slowly precipitates in a dense, crystalline, and readily filterable form. Tetrachlorophthalic acid is the only one studied which quantitatively precipitates thorium. Upon double precipitation at pH 1.0 to 1.2, this acid effects quantitative separation of thorium from the large amounts of rare earths normally found in monazite sand. This precipitation is accomplished by a relatively simple procedure. The precipitate is ignited to the oxide.
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