cyanide process


cyanide process
a process for extracting gold or silver from ore by dissolving the ore in an alkaline solution of sodium cyanide or potassium cyanide and precipitating the gold or silver from the solution.
[1885-90]

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or MacArthur-Forrest process

Method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide.

The process
invented in 1887 by the Scottish chemists John S. MacArthur, Robert W. Forrest, and William Forrest
includes contacting the finely ground ore with the cyanide solution, separating unwanted solids from the clear solution, and recovering the precious metals from the solution by precipitation with zinc dust.

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also called  Macarthur-forrest Process,  

      method of extracting silver (silver processing) and gold (gold processing) from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide. The process was invented in 1887 by the Scottish chemists John S. MacArthur, Robert W. Forrest, and William Forrest. The method includes three steps: contacting the finely ground ore with the cyanide solution, separating the solids from the clear solution, and recovering the precious metals from the solution by precipitation with zinc dust.

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Universalium. 2010.

Look at other dictionaries:

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  • cyanide process — noun an industrial process for extracting gold and silver by treating ore with a sodium cyanide solution • Hypernyms: ↑industrial process * * * noun : a method of extracting gold and silver from ores by treatment with a dilute solution of sodium… …   Useful english dictionary

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  • cyanide process — noun a) A method of extracting gold and silver from their ores with a solution of sodium cyanide b) A process of case hardening iron or steel by immersing it in molten cyanide and then …   Wiktionary

  • cyanide process — cy′anide proc ess n. mel a process for extracting gold or silver from ore by dissolving the ore in an alkaline solution of sodium cyanide or potassium cyanide and precipitating the gold or silver • Etymology: 1885–90 …   From formal English to slang

  • cyanide process — /ˈsaɪənaɪd ˌproʊsɛs/ (say suyuhnuyd .prohses) noun a process for extracting gold from its ores, by dissolving in potassium cyanide, reducing the resulting anion of gold and cyanide with zinc, filtering off the product and subjecting it to… …   Australian English dictionary

  • Cyanide (disambiguation) — Cyanide is a class of chemical compounds. Cyanide may also refer to: Cyanide and Happiness, a webcomic hosted on Explosm.net and written by four authors Cyanide poisoning, a form of poisoning that occurs when a living organism is exposed to a… …   Wikipedia

  • Cyanide — This article is about the class of chemical compounds. For other uses, see Cyanide (disambiguation). The cyanide ion, CN−. From the top: 1. Valence bond structure 2. Space filling model 3. Electrostatic potential surface 4. Carbon lone pair… …   Wikipedia

  • process — processual /pro sesh ooh euhl/ or, esp. Brit, /proh /, adj. /pros es/; esp. Brit. /proh ses/, n., pl. processes /pros es iz, euh siz, euh seez / or, esp. Brit., /proh ses , proh seuh /, v., adj. n. 1. a systematic series of actions directed to… …   Universalium

  • cyanide mill — noun : a mill in which the cyanide process is used …   Useful english dictionary


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