Leaching

In general, leaching is the extraction of certain materials from a carrier into a liquid (usually, but not always a solvent). Specifically, it may refer to:

  • Leaching (agriculture), the loss of water-soluble plant nutrients from the soil; or applying a small amount of excess irrigation to avoid soil salinity
  • Leaching (chemistry), the process of extracting minerals from a solid by dissolving them in a liquid
  • Leaching (metallurgy), a widely used extractive metallurgy technique which converts metals into soluble salts in aqueous media
    • Dump leaching, an industrial process to extract metals from ore taken directly from the mine and stacked on the leach pad without crushing
    • Heap leaching, an industrial process to extract metals from ore which has been crushed into small chunks
    • Tank leaching, a hydrometallurgical method of extracting valuable material from ore
    • In-situ leaching, a process of recovering minerals such as copper and uranium through boreholes drilled into the deposit
  • Leaching (pedology), the loss of mineral and organic solutes due to percolation from soil
  • Bioleaching, the extraction of specific metals from their ores through the use of bacteria
  • In cooking, leaching generally refers to Parboiling.

Other articles related to "leaching":

Tank Leaching - Extraction Efficiency Factors
... Retention time - refers to the time spent in the leaching system by the solids ... to a size that exposes the desired mineral to the leaching agent (referred to as “liberation”), and in tank leaching this must be a size that can be suspended by ... In vat leaching this is the size that is the most economically viable, where the recovery achieved as ore is ground finer is balanced against the ...
Leaching (metallurgy) - Chemistry
... There are a variety of leaching processes, usually classified by the types of reagents used in the operation ... A typical feed for leaching is either oxide or sulfide ... For material in oxide form, a simple acid leaching reaction can be illustrated by the zinc oxide leaching reaction ZnO + H2SO4 → ZnSO4 + H2O In this reaction solid ZnO dissolves, forming soluble zinc ...
Leaching (chemistry) - Leaching Processes For Biological Substances
... This separation process is called liquid-solid leaching or simply leaching ... Because in leaching the solute is being extracted from the solid this is also called extraction ... In leaching, when an undesirable component is removed from a solid with water, the process is called washing ...
Leaching (metallurgy)
... Leaching is a widely used extractive metallurgy technique which converts metals into soluble salts in aqueous media ... Compared to pyrometallurgical operations, leaching is easier to perform and much less harmful, because no gaseous pollution occurs ... Drawbacks of leaching are the highly acidic and in some cases toxic residual effluent, and its lower efficiency caused by the low temperatures of the operation, which dramatically affect ...