Use concentration of leaching agent

The concentration of the leaching agent in the solution is a very important parameter in the heap leaching process. Unlike the conventional agitation leaching, first, the concentration of the leaching agent during the heap leaching process is not constant, but varies; second, due to the heap Dipping can not apply external force, scaling is a common phenomenon in heap leaching, and scaling is closely related to the concentration of leaching agent. For example, in uranium heap leaching, the concentration of sulfuric acid is high, it is easy to produce calcium sulfate scaling (especially in ore). High fluorite content is more serious. If the acidity of sulfuric acid is low, it is easy to hydrolyze the Fe 3 + and Al 3 + in the lower part of the heap to produce hydroxide precipitation. Third, low acid is generally used in heap leaching. in order to achieve selective leaching, heap leaching, such as copper, using the low acid leaching of copper, most of the iron is not leached if the high acidity of sulfuric acid, it is leached with copper and iron, the impurity ions leach crossing multi give Subsequent processing is inconvenient. In summary, it can be seen that the concentration of the leaching agent has a great influence on the leaching.

As a rule of thumb, the concentration of the leaching agent in the heap leaching uses a higher concentration before the peak concentration occurs, a medium concentration in the middle stage, and a lower concentration in the latter stage. The gold heap leaching, the concentration of sodium cyanide generally corresponds to 0.1%, 0.05% to 0.07%. The later period is 0.02% to 0.03%. The experience of using sulphuric acid to leach uranium ore is also roughly the same. It should be pointed out that the concentration of ammonium carbonate used in the heap leaching of alkaline uranium ore must not be too high, otherwise calcium carbonate scale will be produced.

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