Method for leaching chalcopyrite concentrate

摘要

A method for leaching chalcopyrite concentrate by means of an aqueous solution containing sulfuric acid and an oxygen feed at atmospheric pressure and a temperature between 75 ° C and the boiling point of the solution, characterized by the fact that leaching is carried out in two-phase countercurrent leaching form in which the particle size of the concentrate to be fed to a first phase (1) of leaching is in the region of 80% below 60-100 μm, the concentrate is leached in the first leaching phase (1) with a leaching solution (5) leaving a second leaching phase with acid concentration in the region of 40-70 g / l (2) to form a solution (6) of copper sulfate having a regulated acid concentration in the region of 5-15 g / l; a residue (7) of the first phase (1) of leaching is fed to the second phase (2) of leaching, in which the residue is leached with a refining (8) whose acid concentration is regulated to be 20- 90 g / l