34 results about "Pyrrhotite" patented technology

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 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 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 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 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 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.

This invention discloses a denitrifying biological filter based on maifanite-based sulfur-iron composite packing material and its application, belonging to the field of wastewater treatment technology. The denitrifying biological filter established by this invention comprises, from top to bottom, an influent distribution system, a filter media layer, a support layer, an air-water distribution system, and an air distribution pipe system. The composite packing material is prepared by homogeneous mixing and granulation of pyrrhotite, sulfur, and maifanite in a volume ratio of 2-6:1-3:1-3. Based on the sulfur-iron composite autotrophic denitrification process using pyrrhotite and sulfur, and using maifanite, a natural mineral, instead of traditional calcium carbonate as a novel pH adjuster, it effectively maintains the pH of the system, ensuring long-term stable operation. The denitrifying biological filter established using this composite packing material exhibits high reaction efficiency and strong nitrogen and phosphorus removal effects in wastewater treatment applications.

The application discloses a preparation method of a ferrospinel floatation collector and application thereof, and belongs to the technical field of floatation collectors. First, ammonium halide is poured into water, and after being dissolved, nitrobenzene organic matter and a catalyst are added, and sufficient stirring is conducted to obtain a mixed solution A; an acyl halide compound, sodium carbonate and an organic solvent are sequentially added into the mixed solution A, and sufficient stirring is conducted, and reaction is carried out at a temperature of-20-20 DEG C to obtain the ferrospinel floatation collector. The preparation method of the ferrospinel floatation collector and application thereof have the advantages that the ferrospinel collector prepared by the application has good selective collecting effect on ferrospinel, can significantly reduce the content of pyrite and pyrrhotite in zinc concentrate, and improves the quality of the zinc concentrate.

The invention provides a method and system for correcting a pyrrhotite sulfur isotope measurement value based on SIMS, and belongs to the field of mineral geological element measurement and correction. The method comprises the following steps: preparing a sample target from a pyrite standard sample, a first pyrrhotite standard sample, a second pyrrhotite standard sample and a sample to be detected; measuring the 34S / 32S ratio RM of a standard sample analysis point and a sample test point in the target by adopting an SIMS; calculating a sulfur isotope measurement value according to the RM; calculating the average value of the pyrite standard sample measurement values, querying the recommended value, and subtracting to obtain a first fractionation value; similarly obtaining a second fractionation value of each analysis point of the first and second magnetite ore standard samples, and calculating a difference value between each second fractionation value and the first fractionation value; and constructing a regression equation y = kx + b by taking the delta IMFStd, j as a dependent variable y and taking delta IMFStd, j / RM, j as an independent variable x, reversely solving to obtain a fractionation value difference value of each test point, and inversely calculating a recommended value of each test point. According to the invention, the accuracy of the sulfur isotope measurement value of pyrrhotite is improved.

The application provides a method for pre-removing magnetic pyrite in a polymetallic sulfide ore, comprising the following steps: performing one-stage grinding and grading on the raw ore to obtain overflow products with a fineness of 75%-85% of the proportion of the-0.074 mm particle size; performing one-stage magnetic separation on the overflow products to obtain one-stage magnetic separation concentrate and one-stage magnetic separation tailings, which are fed into subsequent flotation operation; performing regrinding on the one-stage magnetic separation concentrate, controlling the fineness of the regrinding products to be 80%-90% of the proportion of the-0.043 mm particle size, and then performing two-stage magnetic separation to obtain two-stage magnetic separation concentrate and two-stage magnetic separation tailings, which are returned to the previous process for cyclic treatment. Through the synergistic regulation of stage grinding and gradient magnetic field strength, the application realizes efficient removal of magnetic pyrite, significantly reduces the entrainment loss of valuable metals in the magnetic products, and provides an efficient and feasible technical solution for solving the magnetic pyrite interference problem in the separation process of a complex polymetallic sulfide ore.

The invention provides a combined collecting agent and application of the combined collecting agent in mineral flotation. The combined collecting agent comprises a halogenated thiophenol compound and 1, 2, 3, 4,-tetrahydro-1-naphthylamine; the combined collecting agent is applied to mineral flotation, through the synergistic effect of the halogenated thiophenol compound and the 1, 2, 3, 4,-tetrahydro-1-naphthylamine, the flotation effect on sphalerite and pyrrhotite is effectively improved, the recovery rate of sphalerite and pyrrhotite in sulphide ore is increased, and then the utilization rate of metal mineral resources is increased.

The invention relates to the technical field of biochar materials, in particular to a pyrrhotite coupled biochar material and a preparation method thereof. Comprising the following components in percentage by weight: 20-30% of nitrogen-oxygen doped carbon skeleton modified charcoal, 8-15% of attapulgite, 21-28% of pyrrhotite and the balance of methyl methacrylate, the preparation method of the nitrogen-oxygen-doped carbon skeleton modified biochar comprises the following steps: S1, dissolving transition metal salt and an imidazole compound in a solvent, uniformly mixing, and carrying out co-pyrolysis to obtain a precursor; s2, crushing a biomass material, performing carbonization treatment, and performing acid pickling to obtain a biochar material; and S3, mixing and grinding the precursor, the biochar material and an activator, and carrying out an activation reaction in ammonia and oxygen atmospheres to obtain the nitrogen-doped carbon skeleton modified biochar.

The application discloses a method for preparing a self-sustaining simultaneous denitrification and phosphorus removal agent by mechanically and chemically activating iron sulfide and an application method thereof, and is characterized in that iron sulfide (including magnetite pyrite ore, low-sulfur fine powder and sulfur fine powder) is used as a main raw material, iron oxide and iron carbonate are used as accelerators, the two are compounded, mixed and ground, then a slurry is prepared by using water and is mechanically and chemically activated to obtain a slurry-shaped denitrification and phosphorus removal agent, or the activated product is vacuum dried and mixed with molten sulfur to obtain a granular denitrification and phosphorus removal agent. The method can greatly improve the biological reaction activity of the iron sulfide and greatly improve the efficiency of the simultaneous denitrification and phosphorus removal.

The invention relates to the technical field of mineral processing, and discloses a magnetic separation-flotation combined magnetite and pyrrhotite separation method which comprises the following steps: crushing and grinding high-sulfur magnetite ore to obtain ore pulp; carrying out ultrasonic treatment on the ore pulp, and carrying out magnetic separation and roughing to obtain a rough concentrate product; the rough concentrate product is subjected to pulsed electric field pretreatment; preparing a modifier aqueous solution with the concentration of 5%-10%, and mixing and blending the pretreated rough concentrate product and the modifier aqueous solution into ore pulp; performing magnetic separation on the ore pulp under a gradient magnetic field to obtain magnetic separation concentrate; and the magnetic concentrate is subjected to flotation treatment, and final pyrrhotite concentrate and high-quality iron concentrate are obtained. Through the synergistic effect of pulsed electric field pretreatment, modifier chemical modification and gradient magnetic field magnetic separation, the separation selectivity and separation efficiency of magnetite and pyrrhotite are remarkably improved, deep desulfurization of iron ore concentrate is achieved, the grade is greatly improved, and meanwhile the method has the advantages of being low in agent consumption and environmentally friendly.