Experimental Study on Copper Recovery from Micro-Fine Bismuth Concentrate
The raw ore of the Shizhuyuan tungsten tin molybdenum bismuth polymetallic mine in Hunan province contains a small amount of copper resources.During the process of molybdenum bismuth bulk flotation followed by separation,most of the copper is enriched in the bismuth concentrate(with Cu grade of about 3％).To improve resource utilization,process mineralogical analysis and copper recovery experiment were conducted on the copper bismuth concentrate.The results show that the main factor affecting copper recovery is the erosion of copper and bismuth mineral surfaces by a large amount of sodium sulfide during front-end operations,resulting in a significant decrease in the floatability of copper,bismuth,and sulfur minerals and a closer proximity.The particle size of each metal mineral in the bismuth concentrate is fine(-0.023 mm content is nearly 70％);The flotation process of"reagent residue(mud)removal,roughing to discard tailings,rough-cleaning,two cleaning and two clean-scavenging flotation"was adopted.CaO+CK-DB was used to suppress bismuth minerals,and Z-200+F6 for selective flotation of copper minerals.The laboratory locked-cycle test obtained a copper concentrate with yield of 7.22％,Cu grade of 23.41％,Bi content of 1.12％,and Cu recovery of 53.28％.The Bi loss rate in the copper concentrate was 0.27％,an effective recovery of low-grade associated copper was realized.The experiment results can provide technical basis for enterprises to further expand their product spectrum.
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