Generally, a relatively simple process is adopted. After primary grinding, the fineness of -200 mesh accounts for about 50%~70%, 1 roughing, 2~3 cleaning and 1~2 scavenging. If the disseminated particle size of copper minerals is relatively fine, the staged grinding process can be considered. Most concentrator treating bornite adopt regrinding-cleaning stage grinding process of coarse concentrate, the essence of which is mixed preferential flotation process. First, after rough grinding, roughing and scavenging, the rough concentrate is reground and then cleaned to obtain high-grade copper concentrate and sulfur concentrate. Roughly grinding -200 mesh accounts for about 45%~50%, and regrinding -200 mesh accounts for about 90%~95%.

2. Flotation of dense copper ore

Because chalcopyrite and pyrite are dense, pyrite is often activated by secondary copper minerals, and the content of pyrite is high, so it is difficult to inhibit separation. It is required to obtain copper concentrate and sulfur concentrate simultaneously in the separation process. Usually, the tailings after copper separation are sulfur concentrates. If the gangue content in the ore exceeds 20%~25%, it needs to be separated again to obtain sulfur concentrate. Two-stage grinding or segmented grinding is often used to treat dense copper ore, which requires fine grinding fineness. The dosage of chemicals is also large, the dosage of xanthate is above 100g/(t raw ore), and the dosage of lime is 8~ 10kg(t raw ore).