Production of lead monoxide from lead sulfate with acidic ammonium acetate
AssigneeN L Industries, Inc.
InventorsEugene Striffler, Jr., Michael A. Kolakowski
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Abstract
An efficient and inexpensive method for producing lead monoxide from impure lead sulfate bearing materials such as recycled battery mud is provided comprising: (a) reacting said material with an ammonium carbonate solution to convert lead sulfate to lead carbonate; (b) decomposing the lead carbonate to produce impure lead monoxide; (c) reacting said impure lead monoxide with an acidic ammonium acetate solution to form a lead acetate solution; (d) reacting ammonium hydroxide with the lead acetate solution to form lead hydroxide; and (e) dehydrating the lead hydroxide to produce lead monoxide.
Claims13
A process for producing lead monoxide from solid lead sulfate bearing material which comprises:
- (a) reacting said material with an ammonium carbonate solution to convert said lead sulfate to lead carbonate;
- (b) decomposing the lead carbonate by heating at temperatures from about 400.degree. to 650.degree. C. to decompose substantially all of said lead carbonate to impure lead monoxide;
- (c) reacting the impure lead monoxide with an effective amount of acidic ammonium acetate solution to convert said lead monoxide to a lead acetate solution;
- (d) reacting the lead acetate solution with ammonium hydroxide to form lead hydroxide;
- and
- (e) dehydrating said lead hydroxide to produce lead monoxide.
A process for producing substantially pure lead monoxide from solid lead sulfate bearing battery mud;
- which comprises:
- (a) reacting an aqueous dispersion of battery mud with an ammonium carbonate solution to form lead carbonate and an ammonium sulfate solution;
- (b) decomposing the lead carbonate by heating at temperatures from about 400.degree. to 650.degree. C. to decompose substantially all of said lead carbonate to impure lead monoxide;
- (c) reacting the impure lead monoxide with an effective amount of acidic ammonium acetate solution to convert said lead monoxide to a lead acetate solution;
- (d) reacting said impure lead monoxide with acidic ammonium acetate to form a soluble lead acetate solution and an insoluble residue;
- (e) separating said lead acetate solution from said insoluble residue;
- (f) adding ammonium hydroxide solution to said lead acetate solution to form insoluble lead hydroxide and ammonium acetate solution;
- (g) separating said lead hydroxide from said ammonium acetate solution;
- and
- (h) heating said lead hydroxide to form substantially pure lead monoxide.
Dependencies are inferred from the claim text.