Cyanide leaching is a mineral leaching is a process of that uses cyanide solution as a leaching agent to extract gold and silver from raw materials containing gold and silver.
The flow direction of the leached material and the leaching reagent is the same the leaching solution with high content of target components can be obtained by downstream leaching, and the consumption of leaching reagent is low, but its leaching speed is slow and the leaching time is long, so as to obtain a higher leaching rate.
The leached materials are leached by several new leaching reagents. The leaching solution obtained from each leaching is evenly sent to the subsequent operation for treatment. The leaching rate of cross-flow leaching is faster. The leaching time is short and the leaching string is high. But the volume of leaching solution is large. The residual reagent concentration in the leaching solution is high, so the reagent consumption is large and the content of target components in the leaching solution is low.
The movement direction of the leached material and the leaching reagent is opposite, that is, the depleted material after several leaching is in contact with the new leaching solution, while the original leached material is in contact with the leaching solution. The leaching solution with high content of target components can be obtained by countercurrent leaching, and the residual reagent in the leaching solution can be fully utilized. Therefore, the consumption of leaching agents is low, but its leaching speed is lower than the crossflow speed, and more leaching stages are needed to obtain a higher leaching rate.
The leaching process of percolation tank can be downstream, cross-flow, or countercurrent leaching; Heap leaching and in-situ leaching generally adopt the downstream circulating leaching process, and continuous stirring leaching generally adopts the downstream leaching process. If crossflow or countercurrent leaching is to be adopted, solid-liquid separation operation shall be added between all levels. The mixing leaching of intermittent operation is generally downstream leaching, but the crossflow or countercurrent leaching process can also be adopted. However, solid-liquid separation is required after each leaching, and the operation is complex. Less application in production. The clear leaching solution can be obtained directly by percolation leaching, and the slurry of stirring leaching can be obtained for subsequent operation treatment only after solid-liquid separation.
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