Study On Flotation Process Of Refractory Copper Oxide Ore In Tibet

In order to explore the refractory reasons for the difficulty of copper oxide ore in Tibet,the problems of the use of toxic and irritating odor xanthate,the complex flotation process,and the inability to effectively recycle copper resources were solved in the sorting process.From the perspective of process mineralogy,this thesis analyzes the reasons for the difficulty of ore selection,develops efficient collectors,simplifies the process flow,and improves the recovery rate of copper.Firstly,the process mineralogy parameters such as mineral composition,element content and distribution,mineral linkage quantitative relationship and parcel relationship of raw ore and tailings were analyzed by using the automatic mineral analysis system(AMICS).The results showed that copper was mainly deposited in borniteite and chrysocolla,followed by malachite,chalcocite and chalcopyrite,of which copper oxide minerals accounted for 30.30%,and gangue minerals contained a variety of silicate minerals and carbonate minerals.The distribution rate of copper in chrysocolla with poor floatability reached 17.04%,and the continuous phenomenon of fine-grained chalcocite and chrysocolla was obvious,and the serious inclusion phenomenon of malachite and quartz was also a key factor that was difficult to separation.The main reason for the low metal recovery rate of copper is that there are coarse-grained chrysocolla particles in the tailings that have reached the degree of liberation,the force between the vulcanized film covering the mineral surface and the agent cannot bring it into the foam product,and the fine-grained bornite wrapped in the coarse-grained gangue mineral cannot produce a good adsorption effect with the agent.The combination test index of the original collector was compared by vulcanization flotation process,dimethyl diathioammonium hypophosphite was screened out as the main raw material,and the ratio of the combined collector dimethyl dithioammonium hypophosphonium,surfactant and hydroxamic acid was preliminarily determined by the five-factor four-level orthogonal test,and the four-factor three-level orthogonal test was carried out in order to optimize the synergistic effect of each factor.The optimal proportions of each factor in the collector were determined to be nitrogenous collector 5%,surfactant 3.4%,hydroxamic acid 3.6%,foaming agent 43%and dimethyldithioammonium hypophosphite 42%.Through the test of single factor influencing conditions,combined with the relationship between minerals,vulcanizing agent and collector,the flotation process was optimized and improved,and finally determined that the fineness of grinding was-0.0740 mm,accounting for 67%,the amount of lime was 750 g/t,the dosage of sodium hydrosulfide was 650 g/t,the reaction time was 5 min,the dosage of collector was 220g/t,the reaction time was 5 min,and the optimal stirring speed of the flotation machine was 1900 r/min.Finally,the open flotation test was carried out,and the flotation index of the new agent combination was obtained by the closed circuit test,the copper concentrate grade reached 19.33%,the recovery rate was 83.13%,compared with the original agent flotation index,the copper grade of the concentrate increased by 2.04 percentage points,and the copper recovery rate increased by 2.87 percentage points.In this thesis,the process mineralogy characteristics of a copper oxide mine in Tibet were analyzed,the reasons for the difficulty of ore selection were found.Using the synergy between surfactant,hydroxamic acid and dimethyldithioammonium hypophosphite,an efficient combination collector with good selectivity and strong collection ability was developed.To achieve the purpose of improving the recycling rate of copper resources,it has practical reference value for production.