| With the continuous development of society,the demand of lead and zinc,as a necessary for national economy development of nonferrous metals,is increasing.So,resources of easily sorted lead-zinc sulfide ore decreased rapidly and a large number of oxide lead-zinc mine for technical bottlenecks and is in a state of unused or low efficiency utilization.Therefore oxide lead-zinc mine resource effective development and utilization of the increasingly urgent.Cerusite and smithsonite are important components of lead-zinc oxide ore.A large number of production practices and experimental studies have found that sulfide flotation is the most commonly used method to recover lead-zinc oxide ore.However,the final flotation recovery is low due to the factors such as the dosage of sulfide agent is difficult to control in the process of curing and th resulting surface sulfide layer is weak and other factors,resulting in a low final recovery of flotation.Therefore,the development of new curing agent and the in-depth study of surface curing mechanism of lead-zinc oxide ore are of great significance to improve its recovery rate.In this paper,the main research object is cerusite and smithsonite,preliminary explore the feasibility of slow release organic sulfide agent in lead-zinc oxide sulfide flotation.Through the difference of flotation recovery,a highly efficient organic curing agent-trithiocyanate acid was selected from several commonly used curing agents.Trithiocyanate acid was used as sulfide agent to carry out single mineral flotation experiments in the laboratory,and the best flotation conditions of cerusite and smithsonite were obtained respectively.Combined with Zeta potential analysis,infrared spectrum analysis,X-ray p Hotoelectron spectroscopy(XPS)analysis,ultraviolet spectrum analysis and other methods,this paper studied the mechanism of triythiocyanate acid to enhance the flotation of oxidized lead-zinc ore,and revealed the slow release sulfidation mechanism of trithiocyanate acid.By comparing the sulfurization properties of seven sulfur-containing compounds,including trithiocyanuric acid,sodium sulfide,sodium thiocyanate,thiosemicarbazide,3-mercapto-1,2,4-triazole,thiomalic acid and sodium thioglycolate,it is found that trithiocyanuric acid and sodium sulfide significantly improve the flotation recovery of cerusite and smithsonite,while the flotation effect of other reagents is not obvious.Compared with sodium sulfide,excessive trithiocyanuric acid does not inhibit the flotation of lead-zinc oxide ore,and the flotation effect does not weaken with the increase of stirring time.Because of its small dosage and good curing effect,trithiocyanuric acid has been selected as a high efficient new organic curing agent for cerusite and smithsonite.Under the following conditions,the amount of trithiocyanuric acid is3.4625×10-6mol/L,the amount of collector butyl xanthate is 1.746×10-4mol/L,the flotation p H is natural p H,the amount of foaming agent 2#oil is 20mg/L,and the curing time is 4min,the flotation recovery of cerusite is up to 93.25%.When the pulp p H is natural p H,the dosage of trithiocyanuric acid is 6.925×10-7mol/L,the dosage of activated agent Cu SO4is 1.5×10-3mol/L,the dosage of collector butyl yellow is2.328×10-3mol/L,the dosage of foaming agent 2#oil is 20mg/L,and the sulfurization time is 5min,the flotation recovery of smithsonite is 91.8%.The results of Zeta potential analysis,infrared spectrum analysis and XPS analysis show that trithiocyanuric acid can chemisorb on the surface of cerusite.The active groups of chemisorb are S-H functional group,C=N functional group and C-N functional group.trithiocyanuric acid reacts with cerusite,one of the sulfhydryl groups in the trithiocyanuric acid molecule faces away from the surface of the mineral,making it difficult to react.A sulfhydryl group directly opposite the mineral surface replaces CO32-in the cerussite to form a sulfhydryl-Pb complex,and another sulfhydryl group combines with the corresponding sulfhydryl group of another trithiocyanuric acid molecule to form S-S bond,generating C6N6S6H2-Pb2network structure.This network structure covers the surface of the cerusite,increases the hydrop Hobic area of the cerusite surface,enhances the flotability of the cerussite surface,and strengthens the sulfide flotation of the cerussite.The results of Zeta potential analysis,infrared spectrum analysis and XPS analysis show trithiocyanuric acid does not react with Zn CO3.After adding Cu SO4,smithsonite surface elements of N,S,Cu,and zinc,O dropped sharply,activator of copper ion and trithiocyanuric acid the three thiol reaction of thiocyanate,generate C3N3S3-Cu3components,covering the surface of smithsonite,improves the flotability of smithsonite surface,for the adsorption of the sodium sulfide provides more active site,achieve the goal of the reinforcement smithsonite sulfide flotation.Trithiocyanuric acid because of the low solubility and constantly used up in the pulp at the same time can continue to dissolve and slowly release to come out,and the dissolution rate in water than in lead and zinc oxide on the surface of the adsorption rate,can keep the stable low concentration sulfide environment,meet the need for a long period of time in the process of sulfide flotation reduction atmosp Here,fully embodies the superiority of the slow release performance.The development of Trithiocyanuric acid,a new high efficiency sustained-release organic sulfide,can avoid the influence of the dosage of sulfide agent,and the sulfide layer generated is stable and not easy to fall off,improving the adverse effect of subsequent collectors on mineral flotation and providing theoretical support for the development and application of new sulfide agent in mineral processing. |
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