Experimental Study on Beneficiation of Fine-grained Copper-Zinc Sulfide Ore from Tengchong,Yunnan
The experimental study on copper-zinc sulfide ore in Tengchong,Yunnan province has been carried out.The results of X-ray fluorescence spectrum analysis and multi-element analysis show that the main valuable elements in the ore are Cu and Zn,and the grade of other metal elements is relatively low.The ore contains 0.38%copper and 1.45%zinc.Copper mainly exists in the form of copper sulfide,and zinc mainly exists in the form of zinc sulfide.The results of ore mineral composition show that the main ore minerals in the ore are chalcopyrite and sphalerite.The main gangue mineral is quartz,followed by sericite(white)mica,tremolite,chlorite,garnet,calcite,fluorite,and so on.The analysis results of dissemination characteristics of chalcopyrite and sphalerite show that the dissemination thickness of copper-zinc minerals is uneven.About 10.90%of copper minerals and 29.40%of zinc minerals are wrapped in gangue minerals in fine particles(particle size less than 30 μm),which is difficult to be recovered efficiently.The results of backscattered electron diagram and energy spectrum analysis of sphalerite show that sphalerite contains 32.21%S,9.14%Fe and 57.23%Zn,which belongs to iron sphalerite and is not conducive to the improvement of zinc concentrate grade.According to the properties of raw ore,under the condition of grinding fineness of-0.074 mm accounting for 92%,zinc sulfate and sodium sulfite was used as zinc inhibitor with the dosage of(2 000+1 000)g/t,Z-200 was used as copper collector with the dosage of 15 g/t,copper sulfate was used as zinc activator with the dosage of 100 g/t,and new high-efficiency selective reagent A2 was used as zinc collector with the dosage of 60 g/t.Through regrinding and reconcentration of zinc rough concentrate,it was determined that the regrinding fineness of zinc rough concentrate was-0.037 mm accounting for 90%.A copper concentrate with copper grade of 18.93%and copper recovery of 76.19%,a zinc concentrate with zinc grade of 40.85%and zinc recovery of 76.85%have been obtained by the whole process locked-cycle tests of"one roughing-one scavenging-two cleanings"for copper and"two roughing-one scavenging-three cleanings"for zinc.
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