Inhibiting leaching of metals from catalysts and sorbents and co

Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing

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106638, 210751, 210901, 210912, 405129, 423DIG20, C04B 202

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active

050282727

ABSTRACT:
During use in hydrocarbon conversion processes, sorbents, e.g. for carbon and metals, and catalysts become contaminated with metals, e.g. heavy metals such as vanadium, nickel and sodium. Leaching of heavy metals can be sharply reduced by treatment of such spent particulate materials with alkaline earth metal compound, e.g. lime, calcium fluoride, calcium sulfate, and barium chloride. Surprisingly, calcium chloride, calcium carbonate, sodium bicarbonate are relatively ineffective.

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