Development history of cyanide extraction of gold by carbon
2020-08-28 09:42Introduction：Development history of cyanide extraction of gold by carbon slurry Carbon slurryis one of the processes for extracting dissolved target components from leached slurry by activated carbon. At present, it is mainly used in industry to adsorb
Development history of cyanide extraction of gold by carbon slurry
Carbon slurry is one of the processes for extracting dissolved target components from leached slurry by activated carbon. At present, it is mainly used in industry to adsorb and extract gold and silver from cyanide slurry.
In 1847 Russia, Nazovsky found that activated carbon could adsorb precious metals from solution. In 1880, Davis etc. used charcoal for the first time to adsorb and recover gold from gold-containing chlorinated solution. Because it is necessary to prepare gold containing clarification liquid and activated carbon can not be returned to use again, this process can not compete with the widely used zinc replacement gold precipitation process in industry.
In 1934, activated carbon was used for the first time to adsorb and extract gold and silver from leached slurry, but the activated carbon could not be used again. It was found by Zadra etc. of the United States in 1952 that the hot mixed solution of sodium hydroxide and sodium cyanide could successfully desorb gold from the gold-loaded carbon, which laid the foundation of the contemporary carbon slurry process and made the recycling of activated carbon come true.
In 1961, Carrington beneficiation plant in Corola, USA, first used the carbon slurry process in small-scale production, and the modern perfect carbon slurry process was first used in the Homs Tek Gold Mine beneficiation plant in South Dakota in 1973, with production capacity of 2250 tons per day. Since then in the United States, South Africa, the Philippines, Australia, Zimbabwe and other countries have established dozens of carbon slurry gold plants. At present, carbon slurry technology has become one of the main processes of cyanide recovery of gold and silver.
From the late 1970s, China began to study the process of extracting gold with carbon slurry. In 1985, a series of gold extraction plants were built in Linghu Gold Mine and Ciweigou Gold Mine. Since then, more than a dozen carbon pulp gold extraction plants have been put into operation, which has become the main process for recovering gold and silver in China.
The experimental results show that the carbon slurry process can be used to extract gold and silver from cyanide slurry as well as to recover gold and silver from leaching slurry of other gold soluble agents.
