Abstract:

The sulfur grade of the first-stage cyclone overflow in the concentrator of Wushan Copper

Mine is 8.46%，and the particle size is extremely fine. The yield of -10 μm particle size is 44.93%，and the

sulfur distribution rate is 44.20%. In order to improve the effect of on-site fine sulfur recovery，a beneficia⁃

tion test was carried out. The results show that the suitable diameters of the overflow pipe and the grit nozzle

of the secondary classification cyclone are 48 mm and 20 mm respectively，and the sulfur distribution rate of

the secondary classification grit is 73.40%，which is 2.13 percentage points higher than that of the on-site

cyclone parameters. The total amount of collector ethyl xanthate determined by the test was 140 g/t，and the

corresponding amounts of roughing 1，scavenging 1 and scavenging 2 were 80，40 and 20 g/t，respectively.

The cyclone grading grits of the sample were treated by one roughing two scavenging and middling merging

and returning process. Compared with the middling sequential returning process，the sulfur recovery rate

was increased by 1.7 percentage points under the condition of slightly lower sulfur grade of the concentrate.

The on-site fine-grained flotation two-time scavenging concentrate is combined into the coarse-grained sul⁃

fur flotation two-time scavenging operation，which can increase the sulfur recovery rate by 1.4 percentage

points，and the industrial test index is good.

Key words:

fine-grained pyrite, grading equipment, process parameters, process transformation, tailings reselection