Solvent extraction method for acquiring alloy with magnetic separation copper nickel matte

The invention relates to a leaching method for alloy obtained by magnetic separation nickel-copper bessemer matte. The invention is characterized in that two-stage atmospheric pressure leaching, pressurized leaching, pressurized deferrization and bluestone evaporation and crystal processes are adopted to obtain pressurized slag with higher noble metal concentration ratio, and the pressurized slagis delivered in the noble metal system directly. The method of the invention belongs to the metallurgical technology for treating the alloy (coarse grain alloy) material obtained by magnetic separation nickel-copper bessemer matte. Nickel, iron, and copper are leached out stage by stage, and the leached slag concentrated with noble metal can be sent for the noble metal processing. Leached lixivium solution including iron is pressurized for deferrization, and after the deferrization, the solution is nickel solution with less foreign impurities, which can be delivered in the nickel system. The lixivium solution includin