enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Leaching (chemistry) - Wikipedia

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

    Biological substances can experience leaching themselves, [2] as well as be used for leaching as part of the solvent substance to recover heavy metals. [6] Many plants experience leaching of phenolics, carbohydrates, and amino acids, and can experience as much as 30% mass loss from leaching, [5] just from sources of water such as rain, dew, mist, and fog. [2]

  3. Leaching (metallurgy) - Wikipedia

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

    Leaching is done in long pressure vessels which are cylindrical (horizontal or vertical) or of horizontal tube form known as autoclaves. A good example of the autoclave leach process can also be found in the metallurgy of zinc. It is best described by the following chemical reaction: [citation needed] 2 ZnS + O 2 + 2 H 2 SO 4 → 2 ZnSO 4 + 2 H ...

  4. Gold cyanidation - Wikipedia

    en.wikipedia.org/wiki/Gold_cyanidation

    Ball-and-stick model of the aurocyanide or dicyanoaurate(I) complex anion, [Au(CN) 2] − [12] Cyanide leaching "heap" at a gold mining operation near Elko, Nevada. The chemical reaction for the dissolution of gold, the "Elsner equation", follows: 4 Au + 8 NaCN + O 2 + 2 H 2 O → 4 Na[Au(CN) 2] + 4 NaOH

  5. Heap leaching - Wikipedia

    en.wikipedia.org/wiki/Heap_leaching

    Heap leaching is an industrial mining process used to extract precious metals, copper, uranium, and other compounds from ore using a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials.

  6. Hydrometallurgy - Wikipedia

    en.wikipedia.org/wiki/Hydrometallurgy

    After leaching, the leach liquor must normally undergo concentration of the metal ions that are to be recovered. Additionally, undesirable metal ions sometimes require removal. [1] Precipitation is the selective removal of a compound of the targeted metal or removal of a major impurity by precipitation of one of its compounds.

  7. Zinc smelting - Wikipedia

    en.wikipedia.org/wiki/Zinc_smelting

    The basic leaching chemical formula that drives this process is: + This is achieved in practice through a process called double leaching. The calcine is first leached in a neutral or slightly acidic solution (of sulfuric acid) in order to leach the zinc out of the zinc oxide.

  8. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    Cyanide leaching "heap" at a gold mining operation near Elko, Nevada. On top of the large mounds of ore, are sprinklers dispensing a solution of cyanide. Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, [1] and another 300 tons is produced from ...

  9. Tank leaching - Wikipedia

    en.wikipedia.org/wiki/Tank_leaching

    In tank leaching the ground, classified solids are already mixed with water to form a slurry or pulp, and this is pumped into the tanks. Leaching reagents are added to the tanks to achieve the leaching reaction. In a continuous system the slurry will then either overflow from one tank to the next, or be pumped to the next tank.