Title: Hydrometallurgical brass dust reclamation

Abstract: A process for winning copper and zinc from brass mill waste products containing oxidic copper and zinc, iron, nickel, or cobalt. The feed material is leached in sulfuric acid, neutralized to a pH between about 2.5 and 3.0, and treated with zinc metal to precipitate copper. After separation of the copper product, residual copper as well as iron and cobalt are removed in a second, oxygen-free, cementation on zinc metal. The liquor is then raised to about pH 4.0 or greater and flushed with oxygen to precipitate iron. Lastly, the purified electrolyte is subjected to zinc electrowinning wherein acceptably pure zinc cathode is produced and sulfuric acid is regenerated.

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Inventors: Kust, Roger N. (Acton, MA, US)

Application Number: 895919
Filing Date: 1978-04-13
Publication_date: 1979-04-17
Assignee: Kennecott Copper Corporation (New York, NY)
Primary Class(es): 205/608 75/724, 75/728, 75/738, 423/36, 423/99
Other Classes:
US Patent Ref:

2509918	May, 1950	Griffith et al.	75/120.
3691038	Sep, 1972	VON Roepenack et al.	75/120.
3826648	Jul, 1974	Bodson	75/109.
3905808	Sep, 1975	Bzura	75/101.
3933478	Jan, 1976	Moore	75/115.
3985857	Oct, 1976	Menendez et al.	423/106.
3994721	Nov, 1976	Bienvenu et al.	75/109.
4071421	Jan, 1978	Masters et al.	204/119.

Other Refs:
Primary Examiner: Ozaki, G.
Assistant Examiner:
Attorney: Sniado; John L., Lorusso; Anthony M.