Multi-layer stacking method

This means that after the leaching of the leaching heap is completed, the mine is not unloaded, and the heap is continuously piled up and then leached. This method has an attractive prospect, first, it eliminates the cost and time of unloading ore; second, saving space; third, lower layer ore (ore leaching already) is useful in metal leaching continued . However, the following problems must be studied and solved: 1 how to maintain the stability of the heap under the pressure of increasing the multi-layer ore; 2 how to maintain sufficient permeability of the lower ore; 3 how to ensure that the metal ions or complexes in the leachate are not Chemical precipitation due to lack of oxygen or pH changes. There is currently debate about this approach, and the data obtained is sometimes contradictory. Obviously, this is related to specific objects and conditions. The research and comparison results of the Aligate Ridge Gold Mine in Nevada, USA, suggest that there is no problem with the stability of the ore under the specific or specific conditions of the mine (3m per layer, totaling up to 18m, ie 6 layers superimposed). The only condition is that the outer slope should be piled up as a step, and the slope angle of the outer slope should be controlled at 2.5:1 (horizontal: vertical). Although the permeability of the lower ore is reduced, the drainage in the lower layers of the ore can still meet the requirements, and there is no major problem in permeability. Their comparison also showed that the gold leaching rate did not decrease due to the addition of multiple layers of ore, or even slightly increased, which is probably due to the further leaching of the remaining useful gold in the lower heap.

Gold ore heap leaching is alkaline leaching. Unless there is a strong reducing agent or a highly active adsorbing substance in the lower heap, the gold ions in the leaching solution will not deposit in the lower layer. By sulfuric acid leaching uranium ore and copper ion concentration is somewhat different situation, acidity, iron leaching solution, such as aluminum, copper, uranium itself may lead to the valence of uranium and the like of the multilayer copper heap leaching is much more complex.

Storage Electricity Radiator