Process for Separating Zinc and Copper

Details

• Personal Author:
  Borrowman, Samuel R. ; Churchward, Philip E.
• Description:
  A method is described for selectively separating zn and cu by solvent extraction and recovering the metals once separated. e.g., a leach solution containing 50 g of cu and 14.8 G zn/l was prepared by leaching a roasted cu concentrate. The ph of this solution was adjusted to approximately 3 to precipitate the bulk of the dissolved fe. An organic extractant was prepared from a kerosine solution containing 20 vol pct bis(2-ethylhexyl)phosphate and 10 pct isodecyl alcohol by contacting with milk of lime to produce the calcium salt. The zn was extracted countercurrently in 3 stages. The loaded organic was scrubbed with a small amount of dilute acid and the aqueous scrub solutuion fed to the extractors. The aqueous effluent or raffinate had a ph of 3.7 and contained 99.4 pct of the copper fed to the system and 3.4 pct of the zinc. The loaded organic extractant was stripped in 3 stages with 2.5N h2so4 containing 25 g zn/l. Of the zn, 96 pct was recovered in a solution containing 100 g zn and 1.5 G cu/l. The zn stripping solution was purified with zn powder and electrolyzed to produce zn metal at >90 pct current efficiency. The spent electrolyte can be recycled; it was successfully used for stripping the loaded organic in a second run. [Description provided by NIOSH]
• Subjects:
  Copper Occupational Health Safety Zinc Compounds
• Series:
  Mining Publications
• Document Type:
  Text
• Genre:
  Other
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SLRC - Salt Lake City Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  6 pdf pages
• NIOSHTIC Number:
  nn:10011826
• Citation:
  U S Pat 3 573 182 1971 Mar; :
• Federal Fiscal Year:
  1971
• Peer Reviewed:
  False
• Source Full Name:
  U.S. Pat. 3,573,182; March 30, 1971; Chem Abstr. 74:114,702P
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0d13a9816f4ed20d05a66e5ee2a287c756a92a972109385fc7f6187c3cef04777d894294c484a69939887421ff1795bdfdaeceb1eb15f94f0efa553cd064b03f
• Download URL:
  https://stacks.cdc.gov/view/cdc/236459/cdc_236459_DS1.pdf
• File Type:
  [PDF - 433.44 KB ]