Poor pain

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Poorness is the name for an ore with a primarily low metal content. By definition, the content below the industrial minimum salary ( English cut-off grade ), from which a deposit barely workable is. For payability Armerze need natural enrichment (. Eg lateritization ), large deposits that a reduction in surface mining permit (eg. Porphyry copper deposits ) or favorable treatment processes , such as in situ - leaching or bacteriological leaching .

Contents

There are no uniform limits as to the metal content from which an ore is designated as poor and are particularly dependent on the raw material . Iron ore with an Fe content of less than 20% was considered poor pain in the 1950s. Modern processing methods such as bacteriological leaching can make former poor ores economical, so that, for example, dumps from old mining can be reprocessed or abandoned stocks can be recovered. Fluctuations in world market prices also play a role.

industrial minimum content of various ores in the mid-1970s
metal industrial minimum content in%
lead 0.5-1.0
uranium 0.01-0.1
mercury 0.1-0.2
iron 20-25

See also

Individual evidence

  1. ↑ cut-off content . In: Lexicon of Geosciences . 1 (A-Edi). Spectrum, Heidelberg / Berlin 2000, p. 379 .
  2. ↑ Poor pain . In: Lexicon of Geosciences . 1 (A-Edi). Spectrum, Heidelberg / Berlin 2000, p. 125 .
  3. ↑ Collective of authors: Basic Geological Knowledge . Ed .: Horst Roschlau, Hans-Joachim Haberkorn. 2nd Edition. German publishing house for basic industry, Leipzig 1977, p. 123-124 .

literature

  • Poor pain . In: Lexicon of Geosciences . 1 (A-Edi). Spectrum, Heidelberg / Berlin 2000, p. 125 .
  • Erich Lewien, Peter Hartmann: Technology of mining . Ed .: University of the German Trade Unions "Fritz Heckert". Fachbuchverlag, Leipzig 1958, p. 19-23 .
  • WG Bachurow, SG Wetscherkin, IG Lutsenko: Underground leaching of uranium ores . Ed .: Chamber of Technology. Atomisdat , Moscow 1969 (150 p., Russian: Подземное выщелачивание урановых руд . Translated by Dr. Lothar Hartmann, Peter Fichtner).
  • Collective of authors: Basic geological knowledge . Ed .: Horst Roschlau, Hans-Joachim Haberkorn. 2nd Edition. German publishing house for basic industry, Leipzig 1977, p. 123-124 .