64 results about "Pyrite" patented technology

A system for dynamic oxidation of a heap of copper ore includes a “process island” for formulating and dispensing oxidizing reactive mixtures having predetermined compositions, and irrigating the heap with the mixtures to progressively transform the ore and maintain conditions for enhanced recovery of metal by heap leaching, solvent-extraction and electrowinning. In embodiments, the system is adapted to obtain copper metal from the refractory copper mineral chalcopyrite.

The application discloses a gold leaching method for pyrite-containing gold ore, and comprises the following steps: after the pyrite-containing gold ore is finely ground, water is added to obtain a slurry; a gold leaching reagent solution is added into the slurry to obtain a mixed leaching solution; the pH value of the mixed leaching solution is adjusted to alkaline, and leaching treatment is performed; and after filtration, a gold-containing leaching solution is obtained; the gold leaching reagent solution comprises polyphosphate, copper salt and thiosulfate; in the gold leaching reagent, polyphosphate is added; under alkaline conditions, polyphosphate ions can be selectively adsorbed or complexed on the surface active sites of pyrite to form a physical or chemical masking layer, thereby effectively blocking the direct contact of pyrite with dissolved oxygen and thiosulfate in the solution, inhibiting the catalytic decomposition of pyrite, significantly reducing the invalid consumption of thiosulfate, stabilizing the pH value and potential of the leaching system, and guaranteeing the efficient leaching of gold.

The application discloses an acidification soil heavy metal passivation and acidification treatment integrated method, and aims to solve the pollution problem of karst pyrite mine area soil. The method comprises the following steps: S1, preparing an improving agent: S11, taking modified dolomite powder, modified rectorite, sulfonated asphalt powder-pullulan composite microspheres, modified chitosan quaternary ammonium salt, modified fly ash based pectin carrier and modified rice husk ash, and uniformly mixing the same to obtain a mixture; S12, adding hydroxyapatite-zeolite composite filler into the mixture, then adding water to adjust the water content of the system to 25%-40%, inoculating a jelly-like bacillus-paenibacillus complex inoculant, fully stirring and mixing, and preparing the improving agent. The method can effectively optimize soil structure, stabilize lead, zinc, cadmium, arsenic and other heavy metals, degrade sulfates, improve soil fertility and microbial activity, and is suitable for the environmental characteristics of karst area rainfall leaching, and can meet the treatment and application requirements of the compound contaminated soil.

The application discloses a method for lime-free and acid-free copper-sulfur flotation separation, wherein a combined inhibitor for copper-sulfur separation comprises ferrous sulfate and amygdalin, and is used as a pyrite inhibitor in flotation separation of chalcopyrite and pyrite.The combined inhibitor ferrous sulfate and amygdalin, a collector and a foaming agent are added to a raw ore after crushing and grinding to perform a copper flotation operation, and after the copper flotation operation, a combined activator sodium percarbonate and copper sulfate, a combined collector and a foaming agent are added to the ore pulp to perform a sulfur flotation operation.The combined inhibitor ferrous sulfate and amygdalin has a strong inhibiting effect on pyrite, and can effectively realize flotation of chalcopyrite; the combined activator sodium percarbonate and copper sulfate has a good de-inhibiting and activating effect on pyrite, and can effectively realize flotation of pyrite, thereby reducing the mineral processing cost while enhancing the copper-sulfur separation effect, and having a good application prospect.

This invention discloses a slow-release sulfurizing agent Fe x S y Its preparation method and application as a rhenium extraction material: Step 1: The pyrite-doped metal roasting product is subjected to an oxidation-reduction reaction, and the raw material is dried and roasted to obtain the product; Step 2: The product is ground and screened to obtain the slow-release sulfiding agent Fe. x S y The slow-release sulfurizing agent Fe x S y Its application, as a slow-release sulfide material, is used in metal corrosion protection, heavy metal-containing wastewater treatment, and soil sulfide replenishment; this invention achieves S 2 The slow release of the substance controls the local effective concentration and forms highly active iron-sulfur chemical bonds. At the same time, the crystal structure is a low-stability crystal system, thus exhibiting high chemical reactivity, which has obvious technical advantages over existing rhenium extraction materials.

This invention relates to a method for preparing nutrient soil based on coal gangue-induced gypsum crystallization and its application in saline-alkali land improvement. It belongs to the field of solid waste resource utilization technology and solves the technical problem of the lack of an integrated method for "coal gangue soil treatment, directional conversion of pyrite FeS2, and in-situ preparation of gypsum CaSO4·2H2O". The method includes the following steps: Step 1, crushing the coal gangue and activating the coal gangue powder; Step 2, mixing cow dung, straw, and FeS2 to obtain initial organic material, adjusting the carbon-nitrogen ratio, and performing aerobic fermentation on the initial organic material to obtain organic fermented material with peak sulfur-oxidizing bacteria abundance; Step 3, uniformly mixing the activated coal gangue powder and organic fermented material, and placing it in a fermentation tank for controlled maturation. The coal gangue-based nutrient soil produced by this method has excellent chemical properties, good porosity, and stable and abundant aggregates. Gypsum CaSO4·2H2O can be used as a core component for saline-alkali land improvement.

This invention discloses a flotation process for efficiently separating pyrite from a mixed concentrate containing molybdenum, bismuth, and pyrite, which relates to the field of metal beneficiation technology. Step A: Raw ore sample: concentration 40%-42%, fineness -0.074mm, content 85-90%; the raw ore sample is fed into the flotation tank. Step B: The raw ore sample is sequentially supplemented with 800-1200g / t quicklime, 10-40g / t DY, 100-500g / t water glass, and 0-30g / t kerosene to form a slurry for molybdenum-bismuth desulfurization roughing, yielding a roughing concentrate and roughing tailings. Step C: The roughing tailings from Step B are subjected to three blank scavenging processes. The middlings from Scavenging I are returned to Step B for roughing again; the middlings from Scavenging II are returned to Scavenging I for further scavenging; the middlings from Scavenging III are returned to Scavenging II for further scavenging; the tailings from Scavenging III are used as the final tailings. Step D: The roughing concentrate from Step B is subjected to three cleaning processes to obtain the final molybdenum-bismuth desulfurization concentrate. Each cleaning process involves adding 0-10g / t of quicklime. DY, 0-10g / t kerosene, and 0-100g / t water glass are used to solve the technical problem of separating pyrite from mixed concentrates, which requires large amounts of existing inhibitors and is difficult to separate.

This invention discloses a method for the comprehensive utilization of sulfide tailings, relating to the field of sulfide tailings treatment technology. This method uses lead-zinc tailings as raw material and innovatively employs a combined "two-stage acid leaching-gravity separation-flotation" process. First, two stages of acid leaching selectively leach calcite associated with barite in the tailings, reducing the influence of muddy calcite while activating pyrite. Subsequently, the acid leaching residue undergoes gravity separation to further separate undissolved calcite, quartz, and other silica-containing gangue minerals. The gravity concentrate is then subjected to flotation to achieve the separation of barite and pyrite, ultimately obtaining high-purity barite and pyrite products respectively. This invention features a reasonable process route and simple operation, effectively solving the separation problem of fine-grained, high-viscosity lead-zinc tailings, achieving full-component purification and utilization of lead-zinc tailings, significantly enhancing the economic value of tailings resources, and reducing the environmental pressure caused by tailings stockpiling, thus demonstrating good economic, environmental, and social benefits.

The application discloses a kind of composite photothermal film, the composite photothermal film is with hydrophilic filter membrane as carrier, carbon / iron sulfide is loaded on carrier;Wherein, the side of hydrophilic filter membrane loaded with carbon / iron sulfide is grafted with hydrophobic group.The application also discloses the preparation method of the above-mentioned composite photothermal film, comprising the following steps: (1) heat treatment is carried out to coal slime, and coal slime is carbonized;(2) carbonized coal slime is mixed with pyrite, after mixing, high-temperature calcination is carried out under inert atmosphere, and carbon / iron sulfide powder is obtained;(3) carbon / iron sulfide powder is dispersed in solvent, after ultrasonic treatment, it is loaded on hydrophilic filter membrane by vacuum filtration;(4) polyethylene glycol solution containing hydrophobic agent is used to carry out one side hydrophobic modification to the hydrophilic filter membrane obtained in step (3) by vacuum filtration, and the composite photothermal film with Janus structure of surface layer hydrophobic, lower layer hydrophilic is obtained;Wherein, the side loaded with carbon / iron sulfide is hydrophobic side.The application finally discloses a high-salinity wastewater treatment device containing the above-mentioned composite photothermal film.

The application discloses a method for improving zinc leaching rate in zinc residue, which is carried out according to the following steps: (1) mechanical activation pretreatment: zinc residue containing zinc ferrite and a reducing agent containing FeS2 are placed in sulfuric acid solution I for ball milling activation to obtain surface-activated ore slurry; (2) hot acid leaching: the obtained surface-activated ore slurry is transferred to sulfuric acid solution II for reaction leaching, and then the obtained reaction product is subjected to solid-liquid separation to obtain zinc leaching solution. The zinc residue is subjected to composite treatment through mechanical activation-pyrite reduction-hot acid leaching: on the one hand, the surface lattice of zinc ferrite is destroyed through mechanical chemical action to increase the reactive active site thereof; on the other hand, the reducing agent containing FeS2 releases reducing sulfur species H2S and S2 in an acid system to reduce Fe3+ in zinc ferrite to Fe2+. 2‑ Fe 3+ in zinc ferrite is reduced to Fe 2+ 2+. The application realizes selective extraction of zinc, effectively inhibits synchronous dissolution of iron, and makes the zinc leaching rate reach more than 96%.

The present application belongs to the technical field of arsenic-containing wastewater treatment, and particularly relates to a method for removing arsenic in water by using a natural polyphenol-mediated pyrite-sulfate system. The method mixes an As(III)-containing water body with a natural polyphenol, pyrite, Fe(II) salt and persulfate for reaction, promotes the Fe(III) / Fe(II) cycle at the interface of the pyrite by using the chelation-reduction characteristics of the polyphenol, rapidly activates the persulfate to generate free radicals, and removes As(III) by the synergistic effect of the oxidation to generate Fe2O3 flocs and the adsorption of the pyrite. The removal rate of As(III) is as high as 99.4% within 10 minutes of the mixed reaction. The method provided by the present application has the advantages of fast reaction speed and no secondary pollution, and is suitable for the treatment of arsenic-containing wastewater.

The present application relates to solid waste resource utilization technical field, specifically to a kind of resource utilization method for extracting kaolin from coal gangue, comprising the following steps: coal gangue raw material is carried out sample analysis and crushing treatment;The crushed coal gangue block is screened;The block with actual particle size size less than 5mm is sent into fluidized bed furnace, and building sand is obtained by roasting;The block with actual particle size size greater than 5mm is carried out wet self-milling treatment, and coal gangue slurry and pebble-like stone are separated;The obtained coal gangue slurry is treated by removing iron;The coal gangue slurry after removing iron is treated by removing sulfur, and pyrite is separated and collected by gravity separation;The coal gangue slurry after removing sulfur is filtered, dried, and then sent into fluidized bed furnace for roasting decarburization, and roasting kaolin is obtained after roasting.The present application realizes the recovery of kaolin, pebble-like stone, building sand, pyrite and other products, and improves the resource utilization rate.

This invention proposes a method for improving the quality of pyrite concentrate powder recovered from cyanide tailings, belonging to the field of slag resource utilization technology. The method includes: mixing raw cyanide tailings ore with water to form a cyanide tailings slurry; filtering the slurry through a fixed mesh screen to remove sand and gravel impurities; and conveying the slurry to an activation tank; adding concentrated sulfuric acid to the activation tank to convert cyanide ions into hydrogen cyanide gas, followed by the addition of alkali solution, a collector, and pine oil to obtain a slurry; agitating and aerating the slurry, causing FeS2-containing slurry particles to float to the surface and be scraped off; continuing agitation and aeration to enrich and purify the FeS2-containing slurry particles; further enrichment and purification followed by scraping off the FeS2 slurry particles to recover the FeS2 slurry particles, yielding concentrate and tailings slurries respectively; the concentrate and tailings slurries undergo solid-liquid separation under the action of a slurry pump, followed by pressure filtration; the filtrate is collected and discharged into a workshop circulating water tank for reuse; after unloading, the concentrate and tailings are collected separately. This invention produces high-quality pyrite concentrate powder with an FeS2 content of approximately 90%.

This invention relates to a low-temperature oxidative roasting pretreatment method and supporting equipment for gold-bearing pyrite. The method includes: raw material preparation; humidification and cooling; low-temperature oxygen-enriched roasting; and roasted sand collection. The supporting equipment includes a batching bin, the bin outlet of which is connected to the feed hopper inlet via an elevator, and the feed hopper outlet connected to the fluidized bed furnace inlet via a conveyor belt. A spraying device is mounted on the conveyor belt. Atomized temperature-regulating and water-replenishing device and a temperature sensor are installed in the upper and middle combustion spaces of the fluidized bed furnace. An online oxygen analyzer is installed on the flue gas duct at the top of the fluidized bed furnace, and is sequentially connected to a waste heat boiler, a cyclone dust collector, an electrostatic precipitator, and an acid production system. The air inlet at the bottom of the fluidized bed furnace is connected to a blower via an air duct. This invention achieves full oxidation of gold-bearing pyrite under low-temperature, oxygen-enriched, and low-gas-velocity conditions, resulting in loose and porous roasted sand and a significantly increased gold and silver exposure rate, providing important technical support for the comprehensive utilization of the valuable components of gold-bearing pyrite.

This application provides a bioleaching method for low-grade copper ore, comprising the following steps: crushing copper-bearing ore and pyrite separately, screening to obtain copper ore powder and iron ore powder, mixing the copper ore powder and iron ore powder and piling them in a heap leaching column, and burying vertical pipes in the heap to obtain a heap; spraying the heap with acid, then inoculating with leaching bacteria solution to carry out the heap leaching process; the leaching process uses raffinate for circulating leaching. The method of this application uses bioleaching to treat low-grade copper ore, which has the advantages of high leaching rate, low pollution, water conservation, and ease of operation. It overcomes the disadvantages of traditional flotation methods for separating low-grade copper ore, which are not only difficult to process but also have extremely low flotation yields, making it difficult to obtain high-grade copper concentrate.

Concentrated metal concentrates and metal products are produced at standard temperature and pressure by sequentially treating metal concentrates with chemical reducing agents such as vanadium (V(II)) and chromium (Cr(II)) and a chemical oxidizing agent (Ce(IV)). Naturally occurring ores such as pentlandite, pyrrhotite, and chalcopyrite contain certain concentrations of iron and sulfur that are preferentially leached out by reaction with chemical reducing agents. The resulting products are concentrated with target metals such as nickel and can be further reacted with chemical oxidizing agents to recover the metal leachate. Furthermore, high concentrations of copper metal products can be separated by leaching with ferric trivalent ions. As the demand for higher quality raw materials increases while the availability of these raw materials decreases, lower quality minerals can be converted into higher quality concentrates. Chemical reducing agents and chemical oxidizing agents can be electrochemically replenished to reuse additional metal concentrates, reducing overall costs and material waste.

The application discloses a preparation method of a pyrite particle electrode based on a mechanochemical method, and adopts a normal-temperature wet-type ball milling process to simultaneously perform particle size refining, surface defect construction and nitrogen-doped carbon coating on natural pyrite and defatted soybean powder in an organic solvent, so that the destruction of a crystal form caused by high-temperature treatment is avoided. Then, the obtained composite powder is mixed with acetylene black, and ion cross-linking forming is performed on sodium alginate and calcium chloride in a low-temperature environment, so that a particle electrode with a three-dimensional porous structure is prepared. The method solves the problems of easy agglomeration and loss of the powder and poor conductivity, and the prepared electrode exhibits excellent charge transfer performance and catalytic activity in a 3DERs-PS system, has high degradation efficiency on rhodamine B and good cycle stability, and realizes efficient treatment of organic wastewater.

The application discloses a kind of compound cement-based concrete of doping pyrite and wood ash, including the following weight parts of raw materials: cement 438 parts;Fly ash 27.35-82.05 parts;Rubble 1182 parts;Sand 430.1-480.7 parts;Pyrite fine sand 25.3-75.9 parts;Wood ash 27.35-82.05 parts;Water reducing agent 8.0-8.2 parts;Water 161 parts.The application is by simultaneously doping 15% pyrite in sand instead of sand, doping 15% wood ash in cement and fly ash instead of fly ash, the mechanical property of concrete is improved most, early strength, cubic compressive strength, tensile strength, elastic modulus can be greatly improved, it can be inferred that wood ash-pyrite improves the overall mechanical property of concrete, wood ash-pyrite can effectively improve the toughness, impact resistance and crack resistance of concrete.The mechanical property of the concrete of the application is obviously superior to the superposition of the concrete of doping wood ash alone and the concrete of pyrite fine sand, and reflects the effect of 1+1>2.

The utility model relates to a kind of electric field activation pyrite removal wastewater total nitrogen device, belong to sewage treatment technical field, the utility model includes water distribution tank, reaction tank and effluent tank;Anode cage, cathode tube are equipped in the reaction tank, and sulphur iron ore particles are filled between cathode tube and anode cage;The power supply is connected to the cathode tube and anode cage;Water distribution tank and reaction tank between being equipped with baffle A, and the bottom of baffle A remains water flow passage A;Reaction tank and effluent tank between being equipped with baffle B;Water flow passage B is left in the left side of baffle B;The structure of the utility model makes sewage contact with sulphur iron ore under the action of electric field, and nitrate nitrogen and nitrite nitrogen can be reduced to nitrogen without biological bacteria, and nitrogen removal rate is high.

This application relates to the technical field of environmental engineering and aquatic ecological restoration, specifically disclosing a method for simultaneous nitrogen and phosphorus removal suitable for slightly polluted water bodies. The method includes the following steps: Preparation of composite packing material: Pyrite powder, organic solvent, and dispersant are pre-prepared into a pyrite suspension, which is then added to a polyurethane foaming system to obtain a mixture. The mixture is injected into a foaming, curing, shaping, perforating, and cutting process to obtain the composite packing material; Biofilm formation: The composite packing material is first subjected to nitrifying bacteria adsorption and biofilm formation; Deployment: The biofilm-formed packing material is deployed in the river water for nitrogen and phosphorus removal, completing the treatment of the slightly polluted water body.

This invention discloses a method, apparatus, electronic device, and program product for predicting transverse and longitudinal wave velocities in rocks. The method includes: obtaining the porosity, density, and volume contents of quartz, clay, carbonate rocks, and pyrite in a marine-continental transitional shale rock; determining the equivalent matrix elastic modulus based on the porosity and the volume contents of quartz, clay, carbonate rocks, and pyrite; determining the volume modulus and shear modulus of the organic matter framework based on the volume modulus and shear modulus of the main phase material and the volume contents, volume modulus, and shear modulus of inclusions; obtaining the volume modulus and shear modulus of the shale matrix minerals based on the equivalent matrix elastic modulus, the volume modulus and shear modulus of the organic matter framework; and determining the volume modulus and shear modulus of the shale under saturated fluid conditions by mixing fluids, shale matrix minerals, and hard pores and fractures. This method can accurately predict transverse and longitudinal wave velocities.

The application relates to a sample pretreatment method for pyrite element analysis. First, a pretreatment agent is prepared: carboxymethyl chitosan is activated on the surface through NHS / EDC, and then reacts with phosphoethanolamine to obtain the pretreatment agent; secondly, a pyrite sample is crushed into particles, and is fully ground into powder together with NaOH, NaNO3 and the pretreatment agent; then, the temperature is increased to 180-250 DEG C and then to 350-450 DEG C for heat preservation; the sintered solid is transferred into a beaker, hot nitric acid solution is added, ultrasonic is used to dissolve the solid, and after cooling, filtration is carried out into a volumetric flask, and dilute nitric acid is used for constant volume to obtain a sample to be tested. The treatment method avoids the use of a large amount of concentrated acid and perchloric acid, the reagent consumption is small, and the method is environment-friendly; the treated sample is determined by an ICP-MS instrument and the like, and the recovery rate can be ensured to be above 95%; compared with a standard value, the RSD value is not more than 5%, and the accuracy is good.

This invention relates to a flotation depressant and flotation method for recovering copper from magnetically separated iron tailings, specifically in the field of mineral flotation technology. The flotation depressant comprises: sulfonated modified tannin, sodium cyanurate, carboxymethyl chitosan, and carbonates. The flotation depressant provided by this invention, through the synergistic effect of its components, achieves highly efficient selective inhibition of pyrite at a pulp pH of 8-9, while having no significant inhibitory effect on chalcopyrite. It is suitable for low-grade, fine-grained, disseminated magnetically separated iron tailings, yielding copper concentrate with a Cu grade ≥19.22% and a recovery rate ≥72.50%. This invention solves problems such as foaming and stickiness, equipment scaling, and difficulty in meeting alkalinity standards in traditional high-alkali lime processes. It has advantages such as low alkali content, high efficiency, and environmental friendliness, and has broad prospects for industrial application.

This utility model relates to inorganic synthesis and materials science, specifically to the production of FeS2 pyrite with trace impurities of Au, Ag, Te, and Cu for subsequent use as a reference sample in laser ablation-inductively coupled plasma mass spectrometry (LA-ICPMS). The technical result achieved is a pyrite-based material with homogeneously distributed trace impurities of Au, Ag, Te, and Cu. The sample is obtained in the following manner, with all annealing processes carried out in quartz ampoules sealed under vacuum: 1) pyrite synthesis by annealing precursors in the form of elemental substances Fe and S in stoichiometric ratios at 700°C; 2) mechanical homogenization of the matrix with trace elements in chalcogenide form in a planetary ball mill with a drum and balls made of zirconium oxide for 60 minutes with the addition of hexane; 3) pressing and annealing the resulting powder at 600°C for 12 hours. The proposed utility model enables the production of high-quality pyrite-based materials with trace amounts of Au, Ag, Te, and Cu, which can subsequently be used as reference samples in LA-ICP-MS.

The present application relates to the technical field of photo-thermal catalytic materials, and discloses a method for microwave-assisted synthesis of FeS2 / MoS2 composite materials and application of the FeS2 / MoS2 composite materials in photo-thermal catalytic reduction of CO2.The present application obtains FeS2 nanosheets by pretreating natural pyrite, and then adds a molybdenum source and a sulfur source to prepare MoS2 / FeS2 photo-thermal catalytic composite materials by microwave hydrothermal synthesis.The present application promotes in-situ growth of MoS2 on the surface of FeS2 by microwave heating, MoS2 and FeS2 both exist in the form of two-dimensional nanosheets, and there is a stable two-dimensional / two-dimensional heterojunction interface with an atomic-level Fe-S-Mo chemical bond.The structure not only widens the spectral absorption range, but also uses the interface chemical bond as an electron transport channel to improve the interface charge separation efficiency and photo-thermal conversion capacity, so that CO2 can be efficiently reduced to CO2, thereby providing a new technology for resource utilization of CO2.

This application provides a method for flotation separation of chalcopyrite and pyrite, relating to the field of mineral flotation. The method involves mixing and flotation of the minerals to be processed, including chalcopyrite and pyrite, with a chalcopyrite collector to obtain chalcopyrite concentrate and pyrite tailings. The general structural formula of the chalcopyrite collector is: [Formula omitted]. This chalcopyrite collector utilizes the high selective affinity of its propyne ester group for copper-active sites on the chalcopyrite surface and its inertness to iron sites on the pyrite surface, achieving precise identification and collection of chalcopyrite from the molecular structure of the reagent, significantly improving the grade and recovery rate of the copper concentrate. The R group is a hydrophobic group facing the pulp, significantly enhancing the surface hydrophobicity of the chalcopyrite particles, thereby enabling them to adhere to flotation bubbles and float.

This invention relates to a method for preparing sulfur concentrate powder using high-silica cyanide tailings, belonging to the field of gold cyanide tailings treatment, and includes the following steps: (1) adding water to the high-silica cyanide tailings to make a slurry, quickly adjusting the pH of the slurry to 1-2, and then adding a composite cyanide removal agent under stirring and dispersion aeration conditions; (2) acidifying the aerated slurry, adding an adjuster to adjust the pH of the slurry back to 7-8; (3) adding a collector and a frother to the pretreated material and performing flotation; (4) the pyrite-containing slurry particles float with the bubbles, are scraped off by a scraper, and after being carefully selected, sulfur concentrate slurry is obtained, and after pressure filtration and drying, sulfur concentrate is obtained; (5) the slurry after scavenging flows into the tailings slurry tank, and after pressure filtration and drying, tailings are obtained. The method of this invention has a good cyanide removal effect, and the cyanide content in the treated tailings and sulfur concentrate is less than 0.5 mg / kg, reducing the hazardous characteristics of tailings to general solid waste, and realizing the complete resource utilization of waste.