Experimental Study on Beneficiation of a Fine-grained Copper Sulfide Ore in Yunnan
Copper is an important strategic mineral resource and an important basic raw material for national economic and social development.It is widely used in electric power,electronic equipment,transportation,air conditioning and refrigeration,construction,home appliances,fuel vehicles and other fields because of its excellent electrical conductivity,ductility and corrosion resistance.An open-pit copper mine in Yunnan has a copper grade of 1.43%and a sulfur grade of 10.62%.Because the ore is a surface ore with severe weathering,fine disseminated particle size,high content of secondary copper sulfide,high sulfur content and unreasonable reagent system,the grade and recovery of copper concentrate are low.In view of the problems of unreasonable on-site reagent system,strong pressure pulling,poor recovery of fine-grained secondary copper sulfide ore and the properties of the ore,multi-element analysis,phase analysis,particle size screening analysis,optimization test of beneficiation reagents and comparative test were carried out.Finally,the combination of lime and pyrite inhibitor STY was used to inhibit pyrite,sodium sulfide activated secondary copper sulfide ore,and butyl xanthate and chelating collector LS901 were combined to collect.Under laboratory conditions,it was proved that the reagent system could effectively improve the copper beneficiation index,and industrial tests were carried out on the basis of the laboratory.The ore in the industrial test was mixed evenly.The ore grade,oxidation rate,secondary copper sulfide content and disseminated particle size are basically the same.The industrial test results show that when the copper grade of the ore is 1.49%,the copper recovery of the new reagent system is increased by 5.13 percentage points,and the copper concentrate grade is increased by 3.57 percentage points.
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