Abstract:

In order to study the influence of subsequent flotation indexes on a low-grade copper ore in

China by high pressure grinding roller，single factor analysis method was used to carry out high pressure

grinding roller test，flotation optimization condition test and flotation open circuit comparison test. The re⁃

sults show that under the conditions of grinding fineness of 65% passing -0.074 mm，calcium oxide dosage

of 1 000 g/t，MAC-12 dosage of 20 g/t，butyl xanthate dosage of 10 g/t，MAC-12 dosage of 10 g/t，butyl

xanthate dosage of 5 g/t，one roughing and one scavenging flotation process，the coarse concentrate with cop⁃

per and sulfur grade of 4.31% and 22.46% respectively and copper and sulfur recovery of 74.382% and

79.053% respectively can be obtained by conventional crushing product flotation. The copper and sulfur

grades of the rough concentrate of the flotation of the high pressure grinding roller product are 4.76% and

23.06%，respectively，and the copper and sulfur recovery rates are 88.137% and 87.082%，respectively.

The grade of copper and sulfur increased by 0.45 and 0.6 percentage points respectively，and the recovery

rate of copper and sulfur increased by 13.755 and 8.029 percentage points respectively. It can be seen that

the copper and sulfur grade and recovery rate of the copper ore can be improved by high pressure grinding

roller operation.

Key words:

high pressure grinding roller, copper and sulfur flotation, selective dissociation