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Heap Leaching of Gold
An alternative is employ heap leaching and activated carbon in columns (CIC) because the number of equipments is cheap and the flowsheet is very simple. In some cases, where there is a good quantity of silver in the pregnant solutions and the option of activated carbon is discarded because its efficiency will be low and won’t absorb all the gold and silver present in the solution. In this case the use of sodium sulphide could reduce the concentration of silver in the pregnant solution employing short times. See table 1.
Table 1. Effect of Sodium sulphide. Dosage 1.6 kg/t.
|
Time (sec) |
Au (ppm) |
Ag (ppm) |
Ag extracted (%) |
0 |
4.70 |
120 |
0.0 |
30 |
4.80 |
51 |
57.5 |
60 |
4.82 |
45 |
62.5 |
120 |
4.75 |
36 |
70.0 |