The slurry density is about 42%, the grinding size is about 200 mesh(80%), the pH value of slurry by lime adjustment is 10-11, and the concentration of leaching gold was 0.03%.Initially, taking into account various factors such as efficiency and cost, the plant manager ran a series of comparative tests on GDA and sodium cyanide.
Reagent |
Ore grade（g/t） |
ResidualGold grade（g/t） |
Tailing water gold grade（g/m3） |
Leaching rate(%) |
Gold adsorption(%) |
Recovery rate（g/t） |
GDA |
1.05 |
0.2 |
0.01 |
81 |
97.5 |
650 |
NaCN |
1.01 |
0.2 |
0.01 |
80.2 |
97.5 |
600 |
Note: the test data is the average of 80 hours of steady continuous operation.