Process for the extended use of strip acid employed in the reclamation of battery acid fluid from expanded lead-acid batteries

Patent · Tue Apr 23 00:00:00 EDT 1991

OSTI ID:5850725

Spitz, R A; Bricker, M

This patent describes a method for recycling contaminated sulfuric acid from lead acid batteries to reclaimed sulfuric acid for reuse in the batteries by removing contaminating iron impurities. It includes diluting the contaminated sulfuric acid to a concentration between 150 and 230 grams per liter; filtering the sulfuric acid through a first filter means to remove solid impurities; oxidizing the sulfuric acid to assure that the iron contaminants are substantially in a ferric form; removing the iron contaminants from the sulfuric acid through liquid-liquid extracting using an extraction agent comprising mixture of a mono- or di-alkyl phosphoric acid and a metal chelation collector selected from the group consisting of a 8- hydroxyquinoline substituted in the No. 7 position with a long chain aliphatic hydrocarbon radical and an oil-soluble 2-hydroxy benzophenoneoxime, a modifier which maintains solubility of the phosphoric acid and the metal chelation collector and enhances phase disengagement, and a water immiscible carrier, the molar ratio of the 8-hydroxyquinoline and the phosphoric acid being between 1:1::1:4, respectively; wherein the ratio of extraction agent to water immiscible carrier is greater than 10:90; the extraction performed at a volumetric ratio between 4:1::1:4, and repeated until the contaminating iron impurities are substantially reduced.

• Assignee: East Penn Manufacturing Co., Inc., Lyon Station, PA (United States)
• Patent Number(s): US 5009868; A
• Application Number: PPN: US 7-454770
• OSTI ID: 5850725
• Resource Relation: Patent File Date: 21 Dec 1989
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
LEAD-ACID BATTERIES
MATERIALS RECOVERY
SULFURIC ACID
DEMETALLIZATION
IRON
PURIFICATION
RECYCLING
REMOVAL
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MANAGEMENT
METALS
PROCESSING
RECOVERY
SEPARATION PROCESSES
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
250903* - Energy Storage- Batteries- Materials
Components
& Auxiliaries