18 results about "Pyrrhotite" patented technology

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 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 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 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.

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 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.

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 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.

The invention relates to a method for comprehensively recovering valuable elements from nonferrous smelting waste acid, and belongs to the technical field of metallurgical engineering. The method comprises the following steps: S1, pumping the waste acid into a first-stage reactor with the dissolved oxygen concentration controlled to be 2 mg / L or below, and adding zero-valent iron powder and pyrrhotite to carry out a reduction reaction, so that pentavalent arsenic in the waste acid is reduced into trivalent arsenic; after the reaction, carrying out solid-liquid separation to obtain copper sulfide slag and reduced liquid containing trivalent arsenic; s2, transferring the reduced liquid obtained in the step S1 to a second-stage reactor with an aeration or ventilation function, and blowing air, oxygen-enriched air or oxygen into the reduced liquid to carry out oxidation reaction, so that trivalent arsenic is oxidized and forms iron arsenate precipitate with iron ions; and after the reaction, carrying out solid-liquid separation to obtain iron arsenate slag and oxidized liquid. According to the method, high-selectivity and high-efficiency separation of copper and arsenic is realized through a valence oscillation strategy of first reduction and then oxidation. The average copper recovery rate is 98% or above, and the average arsenic removal rate is 99% or above.

The invention provides a process for extraction of nickel and copper values from a polymetallic sulfide concentrate, the process comprising: providing a slurry comprising a polymetallic sulfide concentrate in an aqueous leach solution, wherein the polymetallic sulfide concentrate comprises nickel, copper and iron present in a plurality of sulfide minerals and wherein the polymetallic sulfide concentrate comprises pyrrhotite in an amount greater than 5 wt.%; subjecting the slurry to pressure oxidation in one or more continuous oxidation stages to leach nickel and copper into the aqueous leach solution; separating one or more streams of pregnant leach solution from the slurry; and recovering nickel and copper from the one or more streams of pregnant leach solution, wherein at least nickel is leached into the aqueous leach solution in at least one low-intensity continuous oxidation stage conducted at a temperature of between 120°C and 150°C, an oxygen partial pressure of between 50 kPa and 500 kPa, and an oxidation-reduction potential of below 520 mV vs Ag / AgCl, and wherein at least a portion of sulfide in the polymetallic sulfide concentrate is oxidised to form elemental sulfur in the at least one low-intensity continuous oxidation stage.