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  2. Leaching (metallurgy) - Wikipedia

    en.wikipedia.org/wiki/Leaching_(metallurgy)

    Leaching is a process widely used in extractive metallurgy where ore is treated with chemicals to convert the valuable metals within the ore, into soluble salts while the impurity remains insoluble.

  3. Pyrite - Wikipedia

    en.wikipedia.org/wiki/Pyrite

    The mineral pyrite (/ ˈ p aɪ r aɪ t / PY-ryte), [6] or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S 2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. [7] Pyrite cubic crystals on marl from Navajún, La Rioja, Spain (size: 95 by 78 millimetres [3.7 by 3.1 in], 512 grams [18.1 oz ...

  4. Extractive metallurgy - Wikipedia

    en.wikipedia.org/wiki/Extractive_metallurgy

    Extractive metallurgy is a branch of metallurgical engineering wherein process and methods of extraction of metals from their natural mineral deposits are studied. The field is a materials science, covering all aspects of the types of ore, washing, concentration, separation, chemical processes and extraction of pure metal and their alloying to suit various applications, sometimes for direct ...

  5. The controversial gold mine set to go before a planning inquiry

    www.aol.com/controversial-gold-mine-set-planning...

    The 'gold' veins here are iron pyrite, also known as fool's gold [BBC] ... Dalradian says the gold extraction process will no longer involve the use of cyanide, which it dropped as part of a ...

  6. Heap leaching - Wikipedia

    en.wikipedia.org/wiki/Heap_leaching

    The acid is recycled from the solvent extraction circuit (see solvent extraction-electrowinning, SX/EW) and reused on the leach pad. A byproduct is iron(II) sulfate, jarosite, which is produced as a byproduct of leaching pyrite, and sometimes even the same sulfuric acid that is needed for the process. Both oxide and sulfide ores can be leached ...

  7. Bioleaching - Wikipedia

    en.wikipedia.org/wiki/Bioleaching

    Bioleaching is the extraction or liberation of metals from their ores through the use of living organisms.Bioleaching is one of several applications within biohydrometallurgy and several methods are used to treat ores or concentrates containing copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt.

  8. Biomining - Wikipedia

    en.wikipedia.org/wiki/Biomining

    Biological pre-treatment utilizes the natural oxidation abilities of microorganisms to remove unwanted minerals that interfere with the extraction of the target metals. [16] This is not always necessary but is widely used in the removal of arsenopyrite and pyrite from gold (Au). [16] Adidithiobacillus spp. release the gold by the following ...

  9. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Iron(III) sulfate is used in settling minute sewage particles in tank water. Iron(II) chloride is used as a reducing flocculating agent, in the formation of iron complexes and magnetic iron oxides, and as a reducing agent in organic synthesis. [145] Sodium nitroprusside is a drug used as a vasodilator.

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