Gold cyanidation 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.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents ...
Gold cyanidation 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. Production of reagentsfor mineral processing to recover gold, copper, zinc and silver represents approximately 13% of cyanide consumption globally, with the remaining 87% of cyanide used in other i
Extraction of gold using cyanide Gold is found in very low concentrations in the ore from which it is mined. To collect the gold from the ore it needs to be separated from the other minerals in the ore. To do this the gold needs to be made into a soluble form so that it can be separated from the other minerals as gold is insoluble. To make gold soluble sodium cyanide is
The gold is mixed with the sodium cyanide which leads to the following Elseners equation and reaction. This is done to make soluble gold; Now the gold is soluble. 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. Since gold is soluble after the leaching process, it is free to move through the membrane while the rest of ore
The preparation of the ore for processing is similar to flotation. The ore must be ground to a specific size before it can be treated. But instead of being floated away from the rock, it is dissolved by the cyanide to form a liquid solution. As I mentioned for this process to work the ore is ground to a specific size, at a predetermined density. It is then put into a large holding area where the cyanide is added.
There are two commonly used gold cyanidation processes: one is the use of activated carbon to adsorb and recover gold from cyanide pulp, also known as the all slime zinc cyanide replacement method; the other One is to replace the gold with zinc powder after washing in the thickener, also known as the all slime cyanide carbon slurry method, or CIP.
Basically the process is supported by two facts, gold is soluble in dilute solutions of cyanide, and second, the pregnant solution can be processed successfully by using zinc powder or activated carbon and electrowinning. In other words, the process involves several steps from