| 摘要 |
<p>1. A method for the leaching of sulfidic, iron-bearing copper concentrate in a chloride milieu in order to achieve an essentially iron-free, alkali chloride-copper chloride solution, and the recovery of iron and elemental sulfur as solid matter precipitate, where the leaching is carried out continuously on the countercurrent principle and in several stages, characterized in that the copper concentrate is leached in atmospheric conditions at a temperature which at highest corresponds to the boiling point of the solution, and that a longer delay is arranged for the solid matter than the solution flow-through by returning part of said solid matter to leaching contrary to the main flow of the solid matter, wherein the iron is precipitated from the concentrate mainly as hematite. 2. A method according to claim 1, characterized in that the solid matter is returned, with regard to the direction of solid matter flow, to any previous stage reactors, so that the leaching time of the solid matter is prolonged by at least twice compared with leaching time without recycling. 3. A method according to claim 2, characterized in that at the end of every stage there is liquid-solid matter separation, of which the solid matter precipitate obtained as underflow is recycled to a reactor of any previous stage. 4. A method according to claim 2, characterized in that at the end of every stage there is liquid-solid matter separation, of which the solid matter precipitate obtained as underflow is recycled to the first reactor of any previous stage. 5. A method according to claim 1, characterized in that the solid matter is returned within the same stage, with regard to the direction of solid matter flow, to the previous reactors, so that the leaching time of the solid matter is prolonged by at least twice, compared with leaching time without recycling. 6. A method according to claim 5, characterized in that at the end of every stage there is liquid-solid matter separation, of which the solid matter precipitate obtained as underflow is recycled to any reactor of the same stage. 7. A method according to claim 5, characterized in that at the end of every stage there is liquid-solid matter separation, of which the solid matter precipitate obtained as underflow is recycled to the first reactor of the same stage. 8. A method according to claim 1, characterized in that the solid matter is recycled in the single reactor. 9. A method according to claim 1, characterized in that the amount of solid matter in the first reactor of the stage is at least 250 g/L. 10. A method according to claim 1, characterized in that leaching time of the solid matter is at least 10 h.</p> |
