Mineralogical considerations in leaching of primary copper sulfides at elevated temperatures and pressures

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The leaching characteristics of four different ores in sulfuric acid systems pressurized with oxygen are described. The variations in the leaching characteristics between different ores can be largely attributed to differences in mineralogy. Certain gangue mineral alteration phases produced during leaching may trap copper from solution, as well as reduce the porosity of the ore. In addition, the formation of secondary copper sulfides, digenite, and covellite may limit the extraction of copper if the supply of oxygen is restricted to chalcopyrite. Apparently, the key consideration for successful leaching is maximizing the rate of oxidation of the sulfides and, at the ... continued below

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Pages: 24

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Leach, D.L. October 15, 1975.

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Description

The leaching characteristics of four different ores in sulfuric acid systems pressurized with oxygen are described. The variations in the leaching characteristics between different ores can be largely attributed to differences in mineralogy. Certain gangue mineral alteration phases produced during leaching may trap copper from solution, as well as reduce the porosity of the ore. In addition, the formation of secondary copper sulfides, digenite, and covellite may limit the extraction of copper if the supply of oxygen is restricted to chalcopyrite. Apparently, the key consideration for successful leaching is maximizing the rate of oxidation of the sulfides and, at the same time, minimizing the rate of gangue mineral alteration. This can be accomplished at high oxygen pressures and moderate temperatures (70 to 90$sup 0$C) and low pH (less than or equal to 2.0). The ideal ore mineralogy is one that is low in carbonates and easily altered Fe-Mg minerals such as biotite and hornblende, and one that has acceptable pyrite/chalcopyrite ratios. (auth)

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Pages: 24

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Dep. NTIS

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  • Other Information: Orig. Receipt Date: 30-JUN-76

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  • Report No.: UCRL--77379
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/4195586 | External Link
  • Office of Scientific & Technical Information Report Number: 4195586
  • Archival Resource Key: ark:/67531/metadc875414

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  • October 15, 1975

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  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 18, 2016, 1:44 p.m.

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Leach, D.L. Mineralogical considerations in leaching of primary copper sulfides at elevated temperatures and pressures, report, October 15, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc875414/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.