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US 4,578,162 AGranted
Method for dissolving copper in the presence of iron
AssigneeThe Dow Chemical Company
InventorsJames A. McIntyre, Robert F. Phillips, Max R. Oswald
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Abstract
The invention is a method for dissolving copper in the presence of iron comprising: (a) contacting the copper with an oxidant solution; (b) dissolving at least a portion of the copper into the solution; (c) controlling the copper ion concentration in the solution below that required to cause a runaway oxidant decomposition reaction; (d) removing at least a portion of the dissolved copper from the solution; (e) adding additional oxidant to the solution; and (f) at least repeating steps (a) and (b).
Claims14
A method for dissolving copper in the presence of iron comprising:
- (a) contacting the copper with an oxidant solution containing a less-than-stoichiometric amount of oxidant necessary to dissolve all the copper;
- (b) dissolving a portion of the copper into the solution;
- (c) monitoring the copper ion concentration in the solution;
- (d) controlling the copper ion concentration in the solution below that required to cause a runaway oxidant decomposition reaction;
- (e) removing at least a portion of the dissolved copper from the solution;
- (f) adding additional oxidant to the solution;
- (g) at least repeating steps (a) and (b).
4 more elements
Dependencies are inferred from the claim text.