Preparation of copper(II)-ammonia complex ion sulfidization activator and sulfidization flotation method for copper oxide ore

A sulfidization flotation method for a copper oxide ore, comprising:

• a) dropwise adding an ammonia solution into a copper salt solution to produce a mixture;
• b) adjusting the mixture in step a) to pH 6-7.2 with dilute sulfuric acid to produce the copper(II)-ammonia complex ion sulfidization activator, wherein a molar ratio of NH3 to Cu2+ in an active ingredient of the copper(II)-ammonia complex ion sulfidization activator is 2-4:1;
• c) introducing the copper(II)-ammonia complex ion sulfidization activator to a slurry of the copper oxide ore followed by mixing uniformly to produce a mixture;
• and
• d) adding a sulfidizing agent solution to the mixture in step c) to perform sulfidization flotation to obtain a slurry;
• adding a mixed collector and a foaming agent to the slurry obtained in step d) followed by mixing uniformly and skimming to obtain concentrate and tailings.