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US 10,494,696 B2Granted
Metal recovery
AssigneeAlpha Assembly Solution Inc.
InventorsNarahari Pujari, Siuli Sarkar, Bawa Singh, Daniel Goswami
Life of this patent
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Abstract
A method for recovering tin and/or tin alloy from a substrate comprising providing a substrate having tin and/or tin alloy thereon; contacting the tin and/or tin alloy with a stripping solution comprising an inorganic acid and a persulfate compound; recovering tin salt and/or tin alloy salt precipitated from the stripping solution; and recovering tin and/or tin alloy from the tin salt and/or tin alloy salt, respectively.
Claims17
A method for recovering tin and/or tin alloy from a substrate comprising:
- providing a substrate having tin and/or tin alloy thereon;
- contacting the tin and/or tin alloy with a stripping solution consisting essentially of an inorganic acid and a persulfate compound;
- adding a flocculant to the stripping solution;
- recovering tin salt and/or tin alloy salt precipitated from the stripping solution;
- and
- recovering tin and/or tin alloy from the tin salt and/or tin alloy salt, respectively,
- wherein the inorganic acid is selected from sulfuric acid, hydrochloric acid and alkane sulfonic acid;
- and
- wherein the persulfate compound is selected from ammonium persulfate, sodium
- persulfate, barium persulfate, lithium persulfate and combinations of two or more thereof;
- and
- wherein the persulfate compound is present in a concentration from about 100 to about 500 g/l.
9 more elements
A method of removing tin and/or tin alloy from a copper substrate comprising:
- providing a copper substrate having tin and/or tin alloy thereon;
- and
- contacting the tin and/or tin alloy with a stripping solution consisting essentially of an inorganic acid and a persulfate compound,
- wherein the inorganic acid is selected from sulfuric acid, hydrochloric acid and alkane sulfonic acid;
- and
- wherein the persulfate compound is selected from ammonium persulfate, sodium persulfate, barium persulfate, lithium persulfate and combinations of two or more thereof;
- and
- adding a flocculant to the stripping solution.
5 more elements
Dependencies are inferred from the claim text.