De-Zincing Zinc-Coated Metals
Corby G. Anderson, Gerard P. Martins, and Joseph Grogan
Summary: An electrochemical method to dezinc zinc-coated metals
Description: A process has been developed to dezinc zinc-coated metals. An electrochemical-
based technique has been developed to selectively remove the zinc coating from the substrate
metal. Novel hydrometallurgical-methods are subsequently employed for reagent recovery. A
closed loop flowsheet was utilized in order to accomplish near-zero discharge from the process.
The process produces a dezinced metal-scrap (typically steel) and a sellable zinc product.
Main Advantages of this Invention
 Does away with the current
practice of fuming zinc off and
creating a waste stream
 Zinc can be sold after recovery
 Zinc-coated scrap is cheaper than
the currently used black scrap
Potential Areas of Application
 Using recovered zinc as a micro-
nutrient for plants and animals
 Front end of iron foundry
ID number: 14012
Intel ectual Property Status: US utility patent pending (application #14/631,527)
Opportunity: We are seeking an exclusive or non-exclusive licensee for marketing,
manufacturing, and sale of this technology.
For more information contact:
William Vaughan, Director of Technology Transfer
Colorado School of Mines, 1500 Illinois Street, Guggenheim Hall Suite 314, Golden, CO 80401
Phone: 303-384-2555; e-mail: