| 摘要 |
The present invention relates to a method for leaching secondary and primary sulphides of copper in a ferrous chloride medium with iron-oxidising bacteria adapted from the crushing of the mineral from the mine, comprising the steps of: mixing the mineral from the crushing with concentrated sulphuric acid; transporting the material mixed with sulphuric acid by means of a belt; adding a liquid leaching solution at an intermediate point during transport on the belt, said solution consisting of: iron (II) sulphate to reduce the redox potential of the solution-mineral mixture to values less than 550 mV Ag/AgCl; iron (III) sulphate; bacteria and archaea of the mesophile- and thermophile-type belonging to the genera Acidithiobacillus, Leptospirillum and Sulfulobos, previously adapted in an annexed bioreactor plant; and sodium chloride to produce a chlorinated environment in solutions. The method also comprises the subsequent steps of: heaping the material on heap pads to rest for a specific amount of time depending on the mineralogical composition of the material or the operating conditions of the plant; during the resting step, injecting air warmed by a liquid/air exchange system, said air being injected through the lower part of the heap by means of fans; and leaching the heaped material by means of a flow of solutions having a low sulphuric acid content, with ferric ion, which contribute to performing the second step of solubilising the copper sulphides. |
