Process for removing heavy metals from paint chips
AssigneeCognis Corporation
InventorsWilliam E. Fristad, Michael J. Virnig, Jonathan M. Cassel, Dana K. Elliot
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Abstract
Heavy metals are removed from paint chips by leaching with an aqueous acid. Heavy metals are also efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution comprised of an aqueous solution of an acid and a salt. The heavy metals are recovered from the leachant by cementation.
Claims1
A process for removing copper, tin or lead, or combinations thereof from paint chips which comprises contacting the paint chips with an aqueous methanesulfonic acid leachant for a period of time sufficient to transfer at least a portion of one or more of copper, tin or lead from the paint chips to one or more soluble species in the leachant.
Dependencies are inferred from the claim text.