Lixiviant
A lixiviant is a liquid medium used in hydrometallurgy to selectively extract the desired metal from the ore or mineral.[1] The origin is the word 'lixiviate', meaning to leach or to dissolve out, deriving from the Latin lixivium.[2] A lixiviant assists in rapid and complete leaching, for example during in situ leaching. The metal can be recovered from it in a concentrated form after leaching.
Lixiviants may work by altering the redox state of an ore, or by altering the pH. Acidic lixiviants, such as sulfuric acid, are commonly used to leach base metals such as copper,[3] whereas basic lixiviants such as a solution of sodium cyanide are used to leach precious metals.[3]
In the United States, lixiviants which contact the environment are almost always oxidizers of neutral pH because this minimizes risk to the environment.[4]
References
- ^ American Institute of Mining Engineers (1917). Transactions of the American Institute of Mining Engineers, Volume 49. Princeton University: The Institute. p. 617.
- ^ The New English Dictionary
- ^ a b Mular, Andrew; Halbe, Doug; Barratt, Derek, eds. (2002), Mineral Processing Plant Design, Practice, and Control Proceedings, Vancouver, Canada: Society of Mining Engineers, p. 1631, ISBN 0-87335-223-8
- ^ Laughlin, Robert B. (2010). In Situ Leach (ISL) Mining of Uranium (PDF). Stanford University.
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