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US 8,715,615 B2Granted
Recovery of high purity lead oxide from lead acid battery paste
AssigneeRetriev Technologies Incorporated
InventorsW. Novis Smith, Steven A. Kinsbursky
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Abstract
The invention relates to the low temperature recovery of lead oxide (PbO) from lead acid battery paste through the preparation of lead carboxylate from the battery paste and the conversion of the lead carboxylate to PbO.
Claims10
A low temperature process for recovering high purity lead oxide (PbO) from a lead acid battery paste which comprises the steps of:
- A) reacting lead acid battery paste with an alkali hydroxide to remove any sulfates and to form Pb3O4;
- B) reacting the Pb3O4 with a carboxylic acid having 1 to 3 carbon atoms and a reducing agent to form lead carboxylate;
- and
- C) reacting the lead carboxylate under an inert atmosphere at an elevated temperature with concentrated alkali hydroxide to form PbO.
1 more element
A process for recovery of high purity lead oxide (PbO) from lead acid battery paste which comprises the steps of:
- a) reacting lead acid battery paste with sodium hydroxide at a temperature of about 60-70° C. at a pH greater than 10 to form a first slurry;
- b) filtering the first slurry to form a filter cake;
- c) reacting the filter cake with acetic acid to form a first solution;
- d) treating the first solution with glyoxal to form a second slurry;
- e) filtering the second slurry to obtain a filtrate containing lead acetate;
- and then
- f) treating the filtrate with sodium hydroxide under a nitrogen atmosphere at a pH of about 12 to form a third slurry, and then
- g) filtering the third slurry to recover litharge PbO.
5 more elements
Dependencies are inferred from the claim text.