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Froth Flotation Processs Specifiions

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5. A froth flotation process according to claim 2, wherein at least three of R a, R b, R c, and R d are an alkyl group containing from 1 to 4 carbon atoms. 6. A froth flotation process according to claim 2, wherein at least two of R b, R c, and R d are linked to form a cyclic compound. 7.

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