44 results about "Pyrrhotite" patented technology

The invention provides a beneficiation method for high-sulfur copper ore containing mud and pyrrhotite, and belongs to the technical field of ore separation processes. According to the method, the mineral processing technology of copper rapid flotation, enhanced flotation, copper rough concentrate differential regrinding, step-by-step concentration, copper tail sulfur flotation and sulfur tail magnetic separation and a CD-ND + CD-SD combined inhibitor are adopted for synchronously inhibiting argillaceous gangue and pyrite, ethionine ester, isopropyl xanthate and ethionine xanthate collect copper minerals step by step, interference of the argillaceous gangue to the preferential copper flotation process is reduced, and the copper flotation efficiency is improved. The effective inhibition on sulfur is realized under the condition of relatively low pH. The copper and sulfur separation technical scheme combining low-alkali-acid-free flotation and magnetic flotation is constructed, interference of argillaceous gangue on the sulfide ore flotation process is reasonably and effectively controlled, the technological process is short and stable, the copper and sulfur separation index is excellent, the copper and sulfur ore separation recovery rate and grade index are improved, and the method is suitable for industrial production. The method effectively solves the problem of clean and efficient beneficiation and recovery of high-sulfur copper ore containing mud pyrrhotite, and provides a new effective method for clean and efficient recovery of similar copper and sulfur resources.

The invention belongs to the technical field of metallurgy, and relates to a method for comprehensively recovering valuable elements from nonferrous smelting waste acid, which comprises the following steps: S1, mixing the waste acid with pyrrhotite, reacting in a sulfur dioxide atmosphere, and after the reaction, carrying out solid-liquid separation to obtain copper slag and copper removal liquid; and S2, H2S gas is introduced into the copper removal liquid obtained in the step S1, and after reaction, arsenic sulfide slag and arsenic removal liquid are obtained through solid-liquid separation. According to the method, FeS in the pyrrhotite selectively reacts with CuSO4 in the waste acid to generate indissolvable copper sulphide precipitates, meanwhile, under the protection of the sulfur dioxide atmosphere, the arsenic element in the waste acid is kept in a dissolved state and does not precipitate, the copper and arsenic elements in the waste acid can be effectively separated through the synergistic effect of the FeS and the CuSO4, and the separation steps are simple and efficient.

The invention relates to a synthetic standard sample suitable for in-situ pyrrhotite Fe-S isotope analysis and a preparation method and application thereof, and belongs to the technical field of geological analysis and material analysis. The particle size of the synthesized standard sample is 100-150 microns, and the interior of the particle is compact and free of holes; delta 34S is equal to-1.16 + / -0.22 per mill, and delta 56Fe is equal to 0.39 + / -0.03 per mill; the delta 34S in the synthesized standard sample is detected by SIMS, and the standard deviation 2SD of the delta 34S is 0.53%. The delta 56Fe in the synthesized standard sample is detected by LA-MC-ICPMS, and the standard deviation 2SD of the delta 56Fe is equal to 0.47 per mill. The method has the advantages that the pyrrhotite is synthesized in a laboratory, the reproducibility of the synthesized standard sample is realized, and the problems that the original in-situ pyrrhotite Fe-S isotope standard sample is natural in source, very few in available quantity and non-reproducible are solved.

The invention relates to the technical field of underground water remediation, in particular to a biochar-loaded pyrrhotite composite remediation agent as well as a preparation method and application thereof. The preparation method of the biochar-loaded pyrrhotite composite repairing agent provided by the invention comprises the following steps: S1, crushing, pyrolyzing, cooling, grinding and sieving carbon-based biomass to obtain a BC material; s2, dissolving ferric salt, ferrous salt, a sulfur source and a BC material, uniformly stirring, heating, cooling to room temperature, washing and drying to obtain a composite repairing agent; in the composite repairing agent, the molar ratio of Fe7S8 to BC is 1: (1-5). According to the method provided by the invention, Fe7S8 is uniformly dispersed and loaded on the surface of BC with a unique pore structure (agglomeration is effectively relieved) through a simple and convenient one-pot solvothermal synthesis method.

The invention discloses a flotation system for lead-zinc sulfide ore containing pyrrhotite, a technological method of the flotation system and a water treatment method, and belongs to the field of flotation and water treatment. Rough concentrate of the lead-sulfur mixed flotation tank is connected with the lead-sulfur concentration subsystem, tailings are connected with the lead-sulfur scavenging subsystem, lead-sulfur mixed flotation concentrate is connected with the thickener, overflow is connected with the buffer water pool, and underflow is connected with the lead-sulfur separation flotation tank. Lead rough concentrate is connected with the lead concentration subsystem, lead concentrate is connected with the filter press, and filtrate is connected with the buffer water pool. Roughing tailings are connected with a lead scavenging subsystem, sulfur concentrate is connected with a filter press, and filtrate is connected with a buffer water tank. Lead-sulfur mixed flotation tailings are connected with a zinc flotation roughing tank, zinc rough concentrate is connected with a zinc concentration subsystem, zinc concentrate is connected with a zinc concentrate filter press, and filtrate is connected with a buffer water pool. Roughing tailings are connected with the zinc scavenging subsystem and the sedimentation tank, and supernate is connected with the buffer water tank. The buffer pool is connected with ore grinding equipment. The problem that the pyrrhotite is difficult to inhibit after being activated in the zinc blende activation process is solved, the grade and the recovery rate of the zinc concentrate are improved, and the water treatment process is simplified.

The invention relates to the field of mineral processing, and provides a method for reducing the content of sulfur in iron ore concentrate, which comprises the following steps: preparing the iron ore concentrate into ore pulp with the mass fraction of 30-50%; s2, the ore pulp in the step S1 is pretreated, and the pretreatment mode is ultrasonic treatment or hydraulic cavitation treatment; the ore pulp pretreated in the step S2 is subjected to flotation operation, sulfur-containing foam is obtained through flotation, low-sulfur concentrate is obtained, and the remaining product is desulfurized iron ore concentrate; the flotation reagent comprises a conditioning agent, a collecting agent and a foaming agent, the conditioning agent comprises lime and copper sulfate, the collecting agent is amyl xanthate, and the foaming agent is methyl isobutyl carbine.According to the method, ultrasonic or hydraulic cavitation pretreatment is combined with the flotation reagent, the floatability of pyrrhotite in the iron ore concentrate is improved, and the flotation efficiency is improved; and the sulfur content in the iron ore concentrate is obviously reduced.

The application discloses a kind of iron wurtzite and sulphide iron ore mineral asynchronous flotation separation method, belong to nonferrous metal sulphide mineral flotation technical field;The application promotes the flotation of iron wurtzite by slurry aeration, realizes the asynchronous flotation of iron wurtzite, pyrite and pyrrhotite by means of high selectivity collector CTB-2 and oxidant calcium hypochlorite, solves the problem of difficult separation of iron wurtzite and pyrrhotite, and uses high concentration copper sulfate as depressor to rapidly improve the grade of zinc concentrate, uses ferrous sulfate to realize the sulfur-free flotation of sulfur concentrate, and finally obtains high-quality zinc concentrate, first sulfur concentrate (pyrite) and second sulfur concentrate (pyrrhotite) products.The application optimizes and simplifies the beneficiation process, cancels the magnetic separation step in the traditional process, and realizes efficient separation of zinc and sulfur through single flotation method.

The invention belongs to the technical field of mineral flotation, and particularly discloses a pyrrhotite magnesium-reducing flotation collecting agent and a preparation method and application thereof. The preparation method of the collecting agent for magnesium reduction flotation of the pyrrhotite comprises the following steps: mixing styrene, water and an emulsifier solution, and heating and stirring to react in an inert atmosphere; injecting styrene and a functional monomer into the reacted system, and continuously heating and stirring to react; and purifying the reacted system to obtain the collecting agent for magnesium reduction flotation of pyrrhotite. Wherein the functional monomer comprises at least one of 1-vinyl imidazole and 4-methyl-5-vinyl thiazole, and the functional monomer comprises at least one of 1-vinyl imidazole and 4-methyl-5-vinyl thiazole. According to the prepared novel collecting agent, the pyrrhotite in the high-magnesium mineral can be recycled, the maximum benefit recycling of Fe resources is achieved, and finally Fe concentrate which is high in grade and recycling rate and low in Mg content is obtained.

The present invention relates to a method for separating sphalerite and pyrrhotite by a cascade flotation process, and belongs to the field of mineral processing. The method aims at the problems that the X fluctuation in the pyrrhotite molecular formula causes the floatability of different types of pyrrhotite to fluctuate greatly, resulting in the difficulty of separating sphalerite from pyrrhotite, the low quality of zinc concentrate, and the large amount of copper sulfate. The present invention mixes and stirs the sphalerite and pyrrhotite slurry, and then performs cascade flotation to realize the cascade activation of pyrrhotite with different floatation activities, and then performs zinc-sulfur activation and zinc-sulfur separation in the third-stage flotation tailings to produce zinc concentrate and zinc tailings. The present invention greatly reduces the difficulty of separating sphalerite from pyrrhotite by the cascade flotation process, and the zinc concentrate produced contains Zn>49%. At the same time, the amount of copper sulfate consumed by zinc-sulfur separation is reduced by 95% compared with the traditional separation process, which greatly reduces the separation cost of sphalerite and pyrrhotite.

The utility model discloses a modified corncob synergistic pyrrhotite reactor, which relates to the field of sewage treatment equipment, and comprises a rack, the rack is placed in a rear-mounted denitrification filter tank, a plurality of layers of filter boxes are placed in the rack, filter holes are uniformly distributed on the filter boxes, and modified corncobs and pyrrhotite are mixed and stored in the filter boxes. According to the utility model, the rack and the filter box are matched to mix the modified corncobs and the pyrrhotite to serve as a filler layer of the rear-mounted denitrification tank, the corncobs are utilized to continuously provide a carbon source for the denitrification tank, and the pyrrhotite is utilized as a sulfur autotrophic denitrification electron donor, so that mixed nutrition denitrification is realized, and the denitrification efficiency is improved. The synchronous removal of nitrogen and phosphorus elements is realized in the denitrification process, and the cost of deep nitrogen and phosphorus removal treatment is effectively reduced by using the corncob and the pyrrhotite.

The invention relates to the technical field of synthesis of iron sulfide compounds, and discloses an iron sulfide compound and a preparation method thereof. The method comprises the following steps: in the presence of a surfactant, carrying out hydrothermal reaction on a mixed solution containing a sulfur source and an iron source to obtain a first material; the heating rate of the hydrothermal reaction is 4-7 DEG C / min, and the final temperature of heating is 120-220 DEG C; carrying out heat preservation treatment on the first material to obtain a second material; sequentially carrying out ultrasonic treatment and centrifugal treatment on the second material to obtain a ferrous sulfide compound; the ultrasonic treatment time is not less than 10min; the conditions of the centrifugal treatment are as follows: the rotating speed is 6000-9000 rpm, and the time is 8-20 minutes. The preparation method of the iron sulfide compound provided by the invention is simple in process, easy to implement and control and low in cost; the prepared iron sulfide compound is high in crystallinity, and the crystal structure of the iron sulfide compound is similar to that of single-crystal pyrite and pyrrhotite in the natural environment; and the iron sulfide compound is high in purity and high in yield.

The application relates to the field of mineral processing, and discloses a pyrrhotite collector, which comprises a mercaptan group collector, 5-30 parts, an amide group collector, 5-30 parts, a surfactant, 2-10 parts, an organic solvent, 20-50 parts, water, 20-60 parts, a collector aid, 1-15 parts, and a pH regulator, 1-10 parts. The pyrrhotite is efficiently collected by introducing the mercaptan group collector and the amide group collector into the collector. The collector molecules have high affinity with the active sites on the surface of the pyrrhotite, so that the collection efficiency of the mineral is greatly improved, and the technical purpose of significantly improving the ore recovery rate is achieved. Meanwhile, the amphiphilic molecules are used as the surfactant, including an anionic surfactant and a cationic surfactant. The surfactants can effectively adjust the properties of the mineral surface, and the selective separation of the pyrrhotite and other impurity minerals is realized.

The invention discloses a beneficiation method for intensively recovering tungsten and fluorite in sulphide ore flotation tailings, which comprises the following steps: aiming at the sulphide ore flotation tailings with high pyrrhotite content, before scheelite and wolframite flotation, intensively floating and recovering pyrrhotite which is difficult to float, reducing the sulfur content in floating tungsten feed to be about 0.05 percent, and recovering the tungsten and fluorite in the sulphide ore flotation tailings; the influence of sulfide minerals on the tungsten flotation process is eliminated, the obtained tungsten concentrate continues to be subjected to flotation, and in the flotation process, the flotation process aims at sulfide ore flotation tailings which are fine in fluorite dissemination particle size, low in flotation feeding fluorite dissociation degree, high in content of calcium gangue minerals, silicate minerals, mica and the like and extremely complex in gangue components. Fluorite minerals subjected to monomer dissociation are subjected to selective trapping and selective inhibition recovery, fluorite intergrowth minerals are subjected to reinforced flotation, selective ore grinding and reinforced gangue mineral inhibition separation, and tungsten concentrate and fluorite concentrate with high grade and high recovery rate can be obtained.

Nickel and cobalt-containing silicate feedstocks, e.g., ultramafic rock and mining tailings, are reacted with CO2-rich aqueous solutions at fluid: solid ratios below 10, and in the presence of reducing agents such as 1 wt% iron sulfides (pyrite, pyrrhotite, etc.), 5 wt% scrap metallic iron and / or aluminum, etc. The silicates in the feedstocks are dissolved, CO2 is sequestered into carbonates and graphite, and the reducing agents help prevent Ni sequestration in the carbonates and remaining silicates and avoid retention of unreacted Fe-rich sulfides in the final target reaction products. Control of the fluid: solid ratio of solution to feedstock is used to generate the desired target product. Thus, Ni and Co dissolved during carbon mineralization of silicate minerals are precipitated in newly formed Co-bearing, Ni-rich sulfides (rather than Fe-rich sulfides) and Fe-Ni alloy grains (Ni3Fe), some carbon is precipitated as graphite, and some CO2 in the reaction mixture is precipitated in carbonate minerals.

The present invention relates to a method for reducing the amount of sulfur generated in the tail gas from the acid hydrolysis of titanium concentrate. The method comprises the following steps: mixing the titanium concentrate with concentrated sulfuric acid, then adding water to initiate a reaction, and heating to perform a primary acid hydrolysis reaction, thereby producing an acid ore slurry; subjecting the acid ore slurry to a secondary acid hydrolysis reaction in an aerobic environment, thereby oxidizing the pyrrhotite in the titanium concentrate under acidic conditions into an intermediate product that adheres to the pyrrhotite surface, reducing the formation of elemental sulfur, and producing a slaking material; and leaching the slaking material to extract an acid hydrolysis titanium solution. This method solves the problem of sublimated sulfur generated in the existing titanium dioxide production process from titanium concentrate, which tends to remain in production pipelines, thereby clogging the pipelines and affecting the continuity and economic efficiency of production.

The application relates to a heat carrier circulating pyrite concentrate pyrolysis upgrading system, and aims at the problems existing in the prior pyrite concentrate pyrolysis process. The pyrite concentrate is directly contacted and heated by solid heat carriers (pyrolysis residues), the desulfurization efficiency is improved, and heat loss is reduced; circulating hot nitrogen gas is used in the system to heat and convey the materials, the purity and recovery rate of subsequent obtained pyrrhotite are ensured, and the safety of the pyrolysis process is ensured.

The invention belongs to the technical field of comprehensive utilization of coal gangue solid waste resources, and particularly relates to a coal gangue magnetization fluidized roasting and magnetic separation method. The method comprises the following steps: crushing, grinding and sieving coal gangue, treating the coal gangue in a manner of combining magnetization fluidized roasting and magnetization reduction, and then carrying out magnetic separation to obtain a low-iron active aluminum-silicon material and iron-rich phase tailings. According to the method, conversion of weakly magnetic minerals such as pyrite and hematite in the coal gangue to pyrrhotite, magnetite or zero-valent iron is effectively promoted, the magnetic difference is enhanced, the magnetic separation efficiency is improved, and the content of Fe2O3 in a non-magnetic phase is reduced. The low-iron active aluminum-silicon material prepared by the method is suitable for subsequently preparing aluminum oxide, aluminum-silicon alloy or high-performance filler, has the advantages of low energy consumption, thorough iron removal and high activity, and remarkably improves the comprehensive utilization value of the coal gangue.

The application relates to the field of environmental governance technology, in particular to a physicochemical-biological coupling method and device for removing heavy metal vanadium from soil, which comprises the following steps: adding soil contaminated by pentavalent vanadium [V(V)] into a reactor provided with magnetic pyrite particles and anaerobic sediment, then adding synthetic groundwater into the reactor and stirring uniformly to obtain a test water sample; curing the test water sample under anaerobic and light-shielded conditions for at least eight days, so that the microorganisms in the anaerobic sediment convert soluble pentavalent vanadium into tetravalent vanadium precipitate by taking the magnetic pyrite as an electron donor, and the tetravalent vanadium precipitate is attached to unreacted magnetic pyrite; obtaining a solid soil sample after reduction through mud-water separation, and recycling the metal vanadium in the soil through an external magnetic field, wherein the magnetic force strength of the external magnetic field is 1200-3000Gs.

The present invention discloses a flotation system for pyrrhotite-containing lead-zinc sulfide ores, a process method for the system, and a water treatment method, belonging to the fields of flotation and water treatment. The coarse concentrate of the lead-sulfur mixed flotation cell is connected to a lead-sulfur concentrator subsystem, the tailings are connected to a lead-sulfur scavenging subsystem, the lead-sulfur mixed flotation concentrate is connected to a thickener, the overflow is connected to a buffer tank, and the underflow is connected to a lead-sulfur separation flotation cell. The lead coarse concentrate is connected to the lead concentrator subsystem, the lead concentrate is connected to a filter press, and the filtrate is connected to a buffer tank. The rougher tailings are connected to the lead scavenging subsystem, the sulfur concentrate is connected to a filter press, and the filtrate is connected to a buffer tank. The lead-sulfur mixed flotation tailings are connected to a zinc flotation rougher cell, the zinc coarse concentrate is connected to the zinc concentrator subsystem, the zinc concentrate is connected to a zinc concentrate filter press, and the filtrate is connected to a buffer tank. The rougher tailings are connected to a zinc scavenging subsystem, the tailings are connected to a settling tank, and the supernatant is connected to a buffer tank. The buffer tank is connected to grinding equipment. The invention solves the problem that pyrrhotite is difficult to suppress after activation during sphalerite activation, improves the grade and recovery rate of zinc concentrate, and simplifies the water treatment process.

The application discloses a method for deep denitrification and phosphorus removal based on polylactic acid and pyrrhotite cooperation, which comprises the following steps: S1, activated sludge preparation; S2, activated sludge inoculation; S3, reaction component activation; S4, wastewater subsection treatment. In the method, polylactic acid is used as a heterotrophic denitrification solid carbon source, and pyrrhotite is used as an autotrophic denitrification electron donor for denitrification and phosphorus removal, a reaction component is built, and the activation method of the reaction component and the step parameters are defined in detail, so that the best treatment condition is obtained, and the polylactic acid-pyrrhotite composite filler is used for cooperation and denitrification, thereby realizing efficient wastewater denitrification and phosphorus removal.

This invention discloses a method and its application for regulating the oxidation and arsenic speciation transformation of arsenopyrite. The method involves sequentially adding arsenopyrite and pyrrhotite to an acidic, iron-free medium with an initial pH of 2.0 to form a protective galvanic cell coupling, followed by inoculation with *Thiobacillus ferrooxidans* and a shaking reaction. By adjusting the ratio of arsenopyrite to pyrrhotite and the addition of *Thiobacillus ferrooxidans*, the method achieves precise regulation of the oxidation of arsenopyrite and the arsenic speciation transformation through phased changes in arsenic release behavior and the As(III) / As(V) ratio. This method possesses dual application value in resource utilization and environmental remediation, and can be applied to the optimization of pretreatment processes for the biological oxidation of gold-bearing arsenic ores or the control of arsenic pollution migration and transformation in acidic mine wastewater, tailings heap leaching, and arsenic-containing sulfide ore coexisting scenarios.

This invention discloses a flotation method for sulfide ores, comprising the following steps: (1) grinding the sulfide ore to obtain a slurry; (2) adjusting the pH value of the slurry, and then sequentially adding a pyrite inhibitor, a collector, and a frother, and performing flotation to obtain a concentrate and tailings; the chemical structural formula of the pyrite inhibitor is shown in formula (I). The flotation method of this invention preferably uses a pyrite inhibitor, which can be widely used in the separation of copper and sulfur, lead and zinc and sulfur, and the separation of lead, antimony, molybdenum, bismuth and sulfur to inhibit pyrite, marcasite and pyrrhotite. It can produce a strong inhibitory effect on pyrite and pyrrhotite, and has the characteristics of small dosage, non-toxic and environmentally friendly, and can replace sodium cyanide. At the same time, it can effectively solve the problem of excessively high slurry pH value and low separation efficiency caused by the large use of lime, which is conducive to improving the grade of the target mineral concentrate and the flotation recovery rate.

The application provides a method and system for correcting pyrrhotite sulfur isotope measurement value based on SIMS, and belongs to the field of mineral geology element measurement and correction. The method comprises the following steps: preparing pyrite standard sample, first and second pyrrhotite standard samples and a to-be-measured sample into sample targets; measuring the standard sample analysis points and sample test points in the targets by using SIMS 34 S / 32 S ratio R M ; calculating the sulfur isotope measurement value according to R M ; calculating the average value of the pyrite standard sample measurement value, querying the recommended value, and subtracting the first fractionation value; similarly, the second fractionation value of each analysis point of the first and second pyrrhotite standard samples is obtained, and the difference between each second fractionation value and the first fractionation value is calculated; taking Δ IMF Std,j as the dependent variable y IMF Std,j / R M,j as the independent variable x , a regression equation y kx + b is constructed, and then the difference of the fractionation value of each test point is obtained by reverse solving, and the recommended value of each test point is calculated. The application improves the accuracy of the pyrrhotite sulfur isotope measurement value.​​​

This invention belongs to the field of metallurgical technology and relates to a method for the comprehensive recovery of valuable elements from waste acid in non-ferrous smelting. The method includes the following steps: S1, mixing waste acid with pyrrhotite and reacting under a sulfur dioxide atmosphere; after the reaction, copper slag and copper-removing liquid are obtained through solid-liquid separation; S2, introducing H2S gas into the copper-removing liquid obtained in step S1; after the reaction, arsenic sulfide slag and arsenic-removing liquid are obtained through solid-liquid separation. This invention utilizes the selective reaction of FeS in pyrrhotite with CuSO4 in the waste acid to form insoluble copper sulfide precipitate. Simultaneously, under the protection of a sulfur dioxide atmosphere, arsenic in the waste acid remains dissolved and does not precipitate. The synergistic effect of these two factors effectively separates copper and arsenic elements from the waste acid, and the separation steps are simple and efficient.

The invention discloses a composite inhibitor for inhibiting copper ion activated pyrrhotite and application of the composite inhibitor. The composite inhibitor is composed of sodium ethylene diamine tetramethylene phosphonate, soluble starch, modified sodium lignin sulfonate and sodium thiosulfate according to a specific mass percentage. The invention further provides a beneficiation method adopting the inhibitor. The beneficiation method comprises the steps of ore grinding, copper-lead bulk flotation, zinc flotation and concentration. The composite inhibitor can efficiently and selectively inhibit the pyrrhotite activated by Cu < 2 + >, especially monoclinic pyrrhotite through multiple synergistic action mechanisms of complexing stripping, shielding covering and hydrophilic film forming, and obviously reduces the entrainment of Cu < 2 + > in concentrates, so that the grade and recovery rate of copper, lead and zinc concentrates are improved. The inhibitor is environmentally friendly and high in applicability, can be directly embedded into an existing priority flotation process, and has important industrial application value.

The present invention discloses a method for pretreating sulfide polymetallic ores containing pyrrhotite. The method comprises: subjecting the raw ore to heavy medium separation to obtain a first mineral; the heavy medium separation comprises jig heavy medium separation and cyclone heavy medium separation; subjecting the first mineral to a first grinding and magnetic separation to obtain a magnetic concentrate; subjecting the magnetic concentrate to a second grinding and flotation separation to obtain a pyrrhotite concentrate; wherein the heavy medium separation uses the pyrrhotite concentrate as a heavy medium. This method pretreats the ore using a combination of heavy medium separation, magnetic separation, and flotation, and uses the pyrrhotite obtained within the process as the heavy medium in the heavy medium separation process. While ensuring the main metal recovery rate, this method significantly reduces the amount of ore selected, significantly improves the selected grade of sulfide polymetallic ores with a high pyrrhotite content, reduces ore processing costs, and improves the economic benefits of this type of ore.

The present invention discloses a combined activator for flotation desulfurization of high-sulfur magnetite and its application. The combined activator is composed of sodium sulfide, sulfuric acid, copper sulfate, sodium fluorosilicate, and ethylenediamine di-o-hydroxyphenyl sodium acetate (EDDHA-Na). The specific application is to first crush the raw ore into a ball mill for grinding, add the activator sodium sulfide during the grinding process, and achieve a grinding fineness of 200 mesh, accounting for 50% to 90%. The ore pulp concentration is adjusted and enters the flotation tank, and the combined activator is added for stirring and activation. A collector and a foaming agent are added for stirring and aeration, and the sulfur concentrate is collected. The ore pulp after flotation enters a drum magnetic separator for magnetic separation, achieving efficient separation of magnetite and gangue. The present invention adopts a combined activator + composite collector method, which can achieve an effect of 1+1 greater than 2, solves the problem of the existing technology in removing pyrrhotite from high-sulfur magnetite, and achieves efficient separation of magnetite and pyrrhotite. Satisfactory results are achieved.

The invention discloses a method for removing iron from molybdenum concentrate, and belongs to the technical field of impurity removal of molybdenum concentrate. The method comprises four procedures of roasting, ultrasonic pretreatment, magnetic separation and acid leaching, roasting needs to be carried out under the inert atmosphere / vacuum condition, pyrite in the molybdenum concentrate can be converted into pyrrhotite, ultrasonic pretreatment can carry out one wave to reduce the mineral granularity, magnetic substance impurities such as pyrrhotite can be separated out through magnetic separation, and non-magnetic iron impurities can be removed through acid leaching. According to the method, the iron removal rate can reach 97.50% or above, the molybdenum loss is extremely low, the acid consumption of the acid leaching procedure can be effectively reduced, and generation of acid wastewater is reduced.

The invention discloses a flotation reagent and method for sulfur and arsenic mineral activating agent and tin concentrate reverse flotation desulfurization and dearsenification, and belongs to the technical field of mineral processing. The sulfur-arsenic mineral activating agent comprises thiosulfate, soluble lead salt and soluble copper salt, can activate arsenic-sulfur minerals such as arsenopyrite (FeAsS2), pyrite (FeS2) and pyrrhotite (Fe1-xS) in a high-selectivity mode, enhances the flotation performance of the arsenic-sulfur minerals, and is used in cooperation with a cassiterite inhibitor, a sulphide ore collecting agent and a foaming agent, so that the flotation efficiency of the arsenic-sulfur minerals is improved, and the flotation efficiency of the arsenic-sulfur minerals is improved. The method is particularly suitable for flotation removal of arsenic-sulfur minerals in the tin concentrate, the tin loss can be remarkably reduced while the tin concentrate desulfurization and dearsenification efficiency can be greatly improved, and the environmental protection pressure of subsequent smelting is effectively relieved.

The invention discloses a beneficiation method for copper-zinc polymetallic ore containing pyrrhotite and a collecting agent, and belongs to the field of beneficiation. The collecting agent comprises 70%-85% of dithiophosphoric acid and / or dithiophosphate; 15% to 25% of mercaptobenzothiazole salt; and 1-5% of a cosolvent. The collecting agent is suitable for copper and zinc flotation of copper-zinc polymetallic ore at the same time. The beneficiation method for the copper-zinc polymetallic ore containing the pyrrhotite comprises the technological methods of ore grinding, copper flotation, magnetic separation and regrinding to remove the pyrrhotite and zinc flotation, and the same collecting agent is adopted for copper flotation and zinc flotation. According to the method, the pyrrhotite is physically removed before zinc flotation, the defect that the pyrrhotite is activated and floats upwards in the zinc flotation operation is fundamentally overcome, and the quality of the zinc concentrate is ensured. Meanwhile, copper flotation and zinc flotation adopt the same collecting agent and have the advantages of being convenient to operate, small in influence of flotation return water on indexes and the like, and the technological process is low in beneficiation reagent cost and high in recovery rate.