Process Mineralogical Study and Selectability Analysis on a Polymetallic Copper Ore in Brazil
In order to better separate and recover copper minerals and iron minerals from a polymetallic copper ore in Brazil,a systematic study was conducted on the mineral composition,mineral occurrence state,mineral embedding characteristics,and dissociation characteristics of the raw ore using chemical multi-element analysis,optical microscopy,and multi-layered approach(MLA).The results show that the copper grade of the ore is 0.8％,and the iron grade is 25.39％.The copper minerals in the ore are mainly bornite and chalcopyrite,with a small amount of chalcocite malachite.The particle size of copper sulfide mineral aggregates in ores is uneven,but the proportion of fine particles is relatively high.The iron minerals are mainly magnetite,with small contents of hematite,siderite,and ilmenite.The particle size of magnetite is coarser,with+0.074 mm particle size accounting for 73.56％.Gangue minerals mainly include perillarite,mafic amphibole,biotite,plagioclase,magnesium-aluminum spinel,chlorite,grossular garnet,quartz,etc.When the grinding fineness is-0.074 mm accounting for 70％,the dissociation degree of the copper sulfide mineral aggregate is 66.94％and the single dissociation degree of magnetite is 81.97％.In summary,it is recommended to use the process of preferential copper separation and magnetic separation of tailings to recover iron for this ore to comprehensively recover copper and iron.
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