Experimental study on sulfide flotation of skarn type gold and silver bearing copper oxide ore in Sankuanggou Mining Area,Nenjiang City

The skarn copper ore in Sankuanggou Mining Area of Nenjiang City contains 1.04% copper,and the associated gold and silver grades are 1.63 g/t and 55.5 g/t respectively,which can be comprehensively recovered.According to the results of copper phase analysis,the copper oxidation rate reaches 93.45%,and the copper share in the bonded copper oxide is 6.54%,which is difficult to recover by flotation method.The main ore type is mineral-bearing skarn,euhedral granular morphic structure,fissure filling structure,the content of metal minerals accounts for 2% to 3% of the total ore,the primary metal minerals mainly chalcopyrite,bornite,secondary metal minerals mainly limonite,malachite,azurite,gangue minerals are garnet,calcite,siliceous.Combined with the content of main metal minerals,the degree of oxidation and the characteristics of the ore,the beneficiation test of the ore is carried out by sulfide flotation.Copper concentrate with copper grade of 19.06% and recovery of 75.82% is obtained through the test flowsheet of closed circuit of one roughing,one cleaning and two scavenging.Gold and silver are enriched in copper concentrate with gold grade of 35.98 g/t and recovery of 89.31% and silver grade of 1 280 g/t and recovery of 87.83%.The test indexes are good.The test flow,reagent system and sorting index adopted in this paper can provide reference and basis for geological evaluation and mine development of the same type of mines.