Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1991-04-09
1993-05-18
Maples, John S.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
429 49, 75725, 75743, 423 98, C25C 118
Patent
active
052118185
ABSTRACT:
A method and apparatus for recovering lead from scrap lead/acid batteries involves first mechanically breaking up the batteries into small pieces, then feeding the small pieces into a substantially vertical, upwardly diverging separation/leaching column through which ammoniacal ammonium sulphate solution (AAS) passes upwardly at a speed that allows the removal of metallic lead and lead alloys as sinks from the bottom of the column, with comminuted case material floating up and out of the column, while the lead compounds remain in suspension in the column for lead sulphate dissolution. The insoluble lead dirxide from the pastes is removed from the AAS downstream of the column and is slurried with sulphuric acid to convert the lead dioxide to lead sulphate, which is then returned to the separation/leaching column. The clarified AAS is fed to an electrowinning tank where metallic lead is plated out. Make-up anhydrous ammonia is fed into the bottom of the column, while ammonium sulphate being produced from sulphuric acid neutralization and lead sulphate reduction is recovered for fertilizer.
REFERENCES:
patent: 4096045 (1978-06-01), Ahonen et al.
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patent: 4118219 (1978-10-01), Elmore et al.
patent: 4460442 (1984-07-01), Ducati
patent: 4769116 (1988-09-01), Olper et al.
Bratt et al., "Production of Lead via AAS Leaching", Metallurgical Transactions, vol. 1, Aug. 1970, pp. 2141-2142.
Etsell Thomas H.
Moure, Jr. William B.
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