Method for the recovery of metals from the membrane of electrochemical cells
AssigneeThe Dow Chemical Company
InventorGlenn A. Eisman
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Abstract
A method for rejuvenating a membrane or diaphragm from an electrochemical cell which comprises the steps of treating the membrane or disphragm with an inorganic acid at an elevated temperature so as to dissolve metallic particles and then optionally treating the membrane or diaphragm with a basic solution. Metals dissolved in the acid solution can be recovered by conventional methods.
Claims13
A method for rejuvenating a membrane or diaphragm having a metallic coating selected from the group consisting of a platinum group metal, platinum group metal oxide, an alloy of a platinum group metal and mixtures thereof from an electrochemical cell which comprises the steps of treating the membrane or diaphragm with an inorganic acid solution of aqua regia at a temperature of about 35.degree. to 70.degree. C. so as to dissolve metallic particles and then treating the membrane or diaphragm with a basic solution.
A method of rejuvenating a membrane or diaphragm having a metallic coating selected from the group consisting of a platinum group metal, platinum group metal oxide, an alloy of a platinum group metal and mixtures thereof from an electrochemical cell and recovering metallic particles therefrom comprising the steps of treating said membrane or diaphragm with an inorganic acid solution of aqua regia at temperatures of about 35.degree. to 70.degree. C. so as to dissolve metallic particles, separating said acid solution with dissolved particles from said diaphragm or membrane, filtering said acid solution and then recovering metallic particles from said acid solution.
Dependencies are inferred from the claim text.