During the whole leaching process, as the leaching time increases, the leaching rate of gold increases continuously, but the leaching speed is continuously decreasing, and the leaching rate gradually approaches a certain limit value.
The reason why the leaching speed of gold gradually decreases with time is as follows:
1. During the leaching process, the volume and number of gold particles are continuously decreasing due to the continuous dissolution of gold.
2. With the leaching of gold, the diffusion distance of the cyanide agent, dissolved oxygen and gold is increasing.
3. While the gold is dissolved, the impurity elements in the pulp are continuously increased and accumulated, and some impurities may form a harmful film on the surface of the gold particles.
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