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Cyanide (CN), a single carbon atom triplebonded to a nitrogen atom, has proved extremely useful in extracting gold from ore. However, with a toxic reputation dating back to the Holocaust, its use in mining has been very controversial. Through a process called quot; gold cyanidation quot;, quot; the cyanide process quot;, or quot; cyanide leach mining quot;, cyanide is used to extract gold from the surrounding rock.
As we all know, cyanide gold extraction process is still the main gold extraction process used in most countries. In other words, most of the worlds gold today is made from cyanide. But as cyanide is more and more widely used in mines, some problems must be taken into consideration. The first is the acute toxicity of cyanide, which, if used
Abstract. Cyanide extraction of gold through milling of highgrade ores and heap leaching of lowgrade ores requires cycling of millions of liters of alkaline water containing high concentrations of potentially toxic sodium cyanide (NaCN), free cyanide, and metalcyanide complexes. Some milling operations result in tailings ponds of 150 ha and larger.
Toxic sodium cyanide has been used in gold mining since 1887, and it remains the primary reagent in use for gold processing today because it allows for efficient extraction of gold from lowgrade ore.
The conventional cyanidation gold extraction process is divided into two types according to the treatment materials: one is a cyanide plant that processes flotation gold concentrate or treats amalgam and reselects tailings. The other is to treat muddy oxidized ore, using a
The cyanide leaching of tellurides has a history of controversy, with some researchers maintaining that successful gold extraction could be achieved provided that certain conditions were met. Operationally, plant leaching proved to be not as successful as in the laboratory and certainly was not as robust as the leaching of free gold.
Process of Cyanide Gold Extraction
21/08/2020#0183;#32;The infrastructure for a processing plant that uses cyanidation typically costs 30 million, and is therefore, a barrier to entry for gold miners with smaller deposits that do not fit into the largescale economies of gold production. Gold recovery by cyanidation is also of environmental and safety concern as it relies on the use of toxic cyanide.
Gold extraction using cyanide was first introduced in 1880s. It is the most common and efficient method of extracting gold, especially for lowgrade ore. The process involves treating the ore with...
14/05/2013#0183;#32;The cyanide leaches the gold out, but the cyanide can seep into the ground, causing environmental problems and posing threats to human health. Researchers at
In recent years the use of cyanide in gold mining has become the dominant means by which gold is extracted from a body of ore. The mercury amalgamation process had previously been used but recovered only about 60 per cent of an ore bodys gold. In contrast, leaching finely ground ore with cyanide can recover up to 97 per cent of the ore body
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