| With the growth of copper demand in China,copper resources are increasingly scarce,and the shortage of copper resources has seriously restricted the development of the national economy.The mining of copper mines is concentrated on copper resources with copper industrial grade ≥ 0.4%,but the copper-containing waste rock produced in the mining process is directly stored in the waste rock site,resulting in the loss and waste of resources.In order to improve the self-sufficiency rate of copper resources and alleviate the contradiction of shortage of copper resources,the efficient recovery of copper-containing waste rock resources is particularly critical.In this thesis,the copper-containing mining waste rock of Dapingzhang Copper Mine of Yunnan Simao Shanshui copper Company Limited was taken as the research object.The waste rock resources have been stacked in the dump for a long time,which undoubtedly brings many management,safety and environmental problems to the enterprises.Based on the research of process mineralogy of copper-containing waste rock in mining,this paper explores the feasibility of preconcentration of copper minerals.Aiming at the coarse size of-60mm+10mm copper-containing waste rock,chalcopyrite and gangue minerals are separated by photoelectric separation based on the difference of optical properties between minerals.Aiming at the fine size of-10 mm copper-containing waste rock,it is crushed to-3mm.chalcopyrite enrichment is achieved by high grads high intensity magnetic separation based on the magnetic differences among minerals,and the "resource recovery" of copper-containing waste rock is realized by the combined technology of photoelectric and magnetic preconcentration.This thesis draws the following conclusions through the experimental research:1.According to the study of process mineralogy: Chalcopyrite and pyrite are coarse in size and closely related to each other,chalcopyrite is agglomerated and granular distributed in quartz fractures and filled in the gap between pyrite and quartz and the gap between pyrite particles;both of them are weakly magnetic sulfide minerals,it is possible to apply the photoelectric and magnetic preconcentration technology to the waste rock.2.According to the preconcentration experimental study,the copper-containing waste rock has been successfully "transformed into mineral resources" by "photoelectric and magnetic preconcentration combined process" : The-60mm+10mm coarse particle photoelectric preconcentration process achieved an average copper grade of 0.42%,a recovery of 32.70%,and a discarding ratio of 54.44%.The-3mm fine particle magnetic preconcentration process achieved an average copper grade of0.51%,a recovery of 34.62%,and the preconcentration product had an average copper grade of 0.461%,and a recovery of 67.31%.3.According to the mineral processing test research,the combined process of "photoelectric and magnetic preconcentration-flotation" realizes the efficient recovery of copper-containing waste rock: Under the conditions of particle size of-0.074 mm accounted for 70%,quick lime and DF-341 were the adjusters,O-isopropyl-N-ethyl Thionocarbamate and butyl xanthate were the collectors,and terpineol was the frother,the preconcentrated products obtained copper concentrate with a copper grade of 19.11%and a copper recovery of 90.49% through the flotation process of "two roughing-three scavenging-two cleaning";The combined process of "photoelectric and magnetic preconcentration-flotation" is recommended to obtain copper concentrate with copper grade is 19.77% and the recovery of raw ore is 60.60%,which is higher than the fourthgrade product index requirements in the non-ferrous metal industry standard of the People’s Republic of China(YS/T 318-2007). |
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