Method and system for comprehensive recovery and utilization of copper-nickel sulfide ore

A method for comprehensive recovery and utilization of copper-nickel sulfide ore, comprising the following steps:

• 1) selective leaching, comprising:
• obtaining a nickel-iron-cobalt-enriched leachate and a copper-enriched leaching slag by selective leaching, wherein
• the selective leaching is atmospheric non-oxidative leaching and is a method for recovering the main accompanying elements from copper-nickel sulfide ore, which comprises the following selective leaching steps:
• selectively leaching by continuously adding low-grade nickel matte obtained by matte smelting of copper-nickel sulfide ore and a leaching reaction solution to a reaction base liquid in a reaction vessel, and collecting gaseous hydrogen sulfide, a first leachate, and a first leaching slag respectively, wherein the reaction base liquid is a 20-60 wt % sulfuric acid solution, and the leaching reaction solution is a 60-95 wt % sulfuric acid solution;
• and adding water to dissolve the first leaching slag, and collecting a second leachate and a second leaching slag respectively,
• wherein the second leachate is a nickel-iron-cobalt-enriched leachate;
• and the second leaching slag is a copper-enriched leaching slag;
• 2) removing iron from the nickel-iron-cobalt-enriched leachate obtained in the step 1), and collecting an iron removed liquid and an iron residue respectively, wherein the iron removed liquid is used for the extraction of nickel and cobalt, and the iron residue is used for iron making;
• and/or
• smelting the copper-enriched leaching slag obtained in the step 1) in a copper smelting system to obtain copper and noble metals, respectively.