Research on Mineral Processing Technology of Pyrite Containing Pyrrhotite
A pyrite mine in Inner Mongolia contains 23.66% sulfur and 32.26% iron. In order to develop and utilize this mineral resource,the properties of raw ore and beneficiation technology were studied. The study on the properties of the raw ore shows that the main metal mineral of the ore is pyrite,followed by pyrrhotite and magnetite;gangue minerals are main-ly dolomite and calcite. The test determines that the principle process flow is the"flotation-magnetic separation"combined process. When the grinding fineness is 65%-0.074 mm,the amount of copper sulfate is 300 g/t,the amount of butyl xan-thate is 230 g/t,and the amount of 2# oil is 60 g/t,the raw ore is subjected to one roughing,one scavenging,and two cleanings to produce a sulfur concentrate. The closed-circuit test obtained a sulfur concentrate with a sulfur grade of 43.42% and a sulfur recovery rate of 85.46%. Under the condition that the magnetic field intensity of roughing is 1300 Oe and the magnetic field intensity of cleaning is 800 Oe,one roughing and one cleaning are carried out. Finally,the beneficiation in-dex of iron concentrate with iron grade of 53.76% and iron recovery of 17.55% is obtained.