C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 11/08 (2006.01) C22B 3/06 (2006.01)
Patent
CA 2340606
A method for controlling the extraction of gold from a gold ore by the cyanidation process in which a pre-leach including the addition of lead nitrate is used. In order to maintain stable conditions in the leaching process, and to use the leaching reagents efficiently, a potassium permanganate titration step is used to monitor the apparent concentration of thiocyanate in the cyanidation step. This value has been found to be directly related to the rate of addition of lead nitrate in the pre-leach step. Further, the rate of addition of lead nitrate is also directly related to both the time required for, and the efficiency of, the cyanidation step. By establishing a target value, and a preferred range for the apparent thiocyanate concentration based on the properties of the ore being processed, optimal extraction conditions can be established and maintained by monitoring the apparent thiocyanate concentration.
Deschenes Guy
Fulton Michael
Her Majesty In Right Of Canada As Represented By The Minister Of
Shapiro Cohen
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