What chemical is used in gold leaching?
sodium cyanide solution
A sodium cyanide solution is commonly used to leach gold from ore. There are two types of leaching: Heap leaching: In the open, cyanide solution is sprayed over huge heaps of crushed ore spread atop giant collection pads. The cyanide dissolves the gold from the ore into the solution as it trickles through the heap.
What is the leaching agent in cyanide process?
This is done to make soluble gold. This method of making soluble gold is known as leaching. In the process of leaching, a dilute form of sodium cyanide is added into the ore containing the gold.
How is gold ore concentrated by cyanide leaching?
Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. In a typical application, a slurry of the ground ore is mixed with cyanide in the presence of activated carbon.
What is cyanide leaching with example?
Cyanide leaching has been the industry standard for gold processing for more than 100 years. During the cyanide leach process, a cyanide solution, or lixiviant, is percolated through ore contained in vats, columns or heaps. Gold is dissolved by the cyanide and then removed from the heap or columns.
How is gold extracted by leaching?
Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction.
What are the key reactants for gold leaching?
It is known that gold can be efficiently leached from gold-bearing ores using a mixture of hydrochloric acid, ferric chloride, and manganese dioxide. 12 The chemical reaction involved during the dissolution of gold in this media is shown in Reaction 7.
Which metal is leached by cyanide process?
What is the process of leaching?
Leaching is the process by which constituents of a solid material are released into a contacting water phase. physical degradation of the solid matrix due to erosion or cracking, and. loss of matrix constituents due to the leaching process itself.
How is gold ore concentrated?
These deposits are mined, crushed and ground, and then concentrated first by gravity separation to recover coarse particles of native gold before being subjected to froth flotation to concentrate the sulfide mineral fraction that contains the gold.
How do you extract gold from a cyanide solution?
The two conventional processes for gold and silver recovery from cyanide leach solution are: The Carbon Adsorption Process and the Merrill–Crowe zinc dust cementation process. In the Carbon Adsorption Process, the precious metals are absorbed onto granules of activated carbon.
What is acid leaching give example?
Metallurgical process for dissolution of metals by means of acid solution. Examples include extraction of copper from oxide- or sulfide-bearing ore and dissolution of uranium from sandstone ores. Acid leaching can occur on heap-leach pads or in situ.
What is leaching for gold?