79 results about "Iron sulfide" patented technology

The invention discloses a tetracycline hydrochloride-containing wastewater treatment method in the field of wastewater treatment, which comprises the following steps: introducing tetracycline hydrochloride-containing wastewater into a reactor, adding a multilevel structure iron and iron sulfide composite carbon material, and adjusting the system to a nearly neutral condition; then adding potassium peroxymonosulfate composite salt, starting a direct current system, and carrying out catalytic degradation reaction under specific current density; and finally recovering the catalyst through magnetic field separation. The preparation method comprises the following steps: grinding pyrite and hematite, ball-milling and mixing the ground pyrite and hematite with orange peel powder and sodium hydroxide, and carrying out microwave pyrolysis, acid washing and drying, hydrogen peroxide surface treatment and the like to obtain a final product. According to the method, efficient degradation of tetracycline hydrochloride under the neutral condition is achieved, the catalyst can be magnetically recycled, secondary pollution is avoided, and the method has the advantages of being low in cost, easy and convenient to operate, environmentally friendly and the like.

A nanocomposite material including iron sulfide (FeS2) nanoparticles, iron oxide (α-Fe2O3) nanoparticles, titanium dioxide (TiO2) nanoparticles, and graphitic carbon nitride (C3N4) nanosheets and a method of its preparation. The nanocomposite is used in a method of forming oxygen gas from water using an applied voltage and photoirradiation, a method of forming hydrogen gas from water using an applied voltage and photoirradiation, and a method of photodegrading organic pollutants using visible light photoirradiation.

This disclosure relates to an arsenic fixation composition and its application method in a coal washing process. The arsenic fixation composition exhibits a good synergistic effect among dolomite powder, auxiliary absorbent, and catalyst, enabling the adsorption of arsenic from the coal washing process products after conversion. This reduces the arsenic content in the coal washing process products and improves arsenic removal efficiency. Using inexpensive, low-cost, and widely available dolomite powder as the main adsorbent reduces environmental pollution problems associated with traditional coal washing processes and improves their environmental performance. The use of a composition of petroleum sulfide and Fe-Mn composite oxides as the auxiliary absorbent allows for several advantages. First, the sulfur in petroleum sulfide converts trivalent arsenic in coal into pentavalent arsenic, facilitating absorption by the absorbent. Second, the Fe and Mn in the Fe-Mn composite oxides react with sulfur to form iron sulfide and manganese sulfide, preventing sulfur from entering the washing water and causing environmental pollution.

Disclosed herein are methods for controlling iron sulfide associated with a wellbore, downhole formation, reservoir or well, or infrastructure or equipment used in the extraction, production, processing, transportation, storage or disposal of a fluid, such as in pipelines and other infrastructure or equipment used in the oil and gas industries, as well as many other industries.

The application relates to the technical field of sodium ion battery negative electrode materials, and discloses a preparation method and application of a copper-iron sulfide / nitrogen-doped porous carbon composite material, which comprises the following steps: (1) mixing copper salt, potassium ferricyanide, a nitrogen source and polyethylene glycol, and obtaining a copper-iron Prussian blue precursor after ball milling; (2) pyrolyzing the copper-iron Prussian blue precursor under an inert atmosphere, washing and removing impurities, and drying to obtain an intermediate product; and (3) heat-treating the intermediate product and a sulfur source under an inert atmosphere to obtain a copper-iron sulfide / nitrogen-doped porous carbon composite material. Through the synergistic effect of the double-metal sulfide and the nitrogen-doped porous carbon composite, sodium ions with a larger ion radius can be more easily embedded and de-embedded in the interlayer spacing, meanwhile, abundant active sites are provided to enhance ion storage, so that the sodium ion battery has outstanding rate performance and stable cycle performance.

The application discloses a method for treating antibiotic wastewater by using a graphdiyne / ferrous indium sulfide nanocomposite to activate persulfate, and the method is characterized by using the graphdiyne / ferrous indium sulfide nanocomposite as a catalyst to activate persulfate for degrading and treating antibiotic wastewater, wherein the graphdiyne / ferrous indium sulfide nanocomposite comprises ferrous indium sulfide nanoparticles, and the nanoparticles are loaded with graphdiyne nanosheets. The method for treating antibiotic wastewater by using the graphdiyne / ferrous indium sulfide nanocomposite to activate persulfate uses the graphdiyne / ferrous indium sulfide nanocomposite as a catalyst, wherein the nanocomposite has many reactive sites, high catalytic activity and good stability, can efficiently activate persulfate with a smaller amount of catalyst, can efficiently remove antibiotics in wastewater, and has the advantages of low cost, high treatment efficiency, good removal effect, green environmental protection and the like, and therefore, the method has important significance for effectively purifying antibiotic wastewater, has high use value and good application prospect.

This application provides an iron-based thin-film probe, an in-situ analysis method for soil micro-interface pollutants, a screening method for iron-based materials for soil remediation, and a soil remediation method, belonging to the field of environmental analysis and testing technology. The iron-based thin-film probe, used to study the role of iron-containing mineral micro-interface pollutants in soil, is prepared from an iron sheet through in-situ surface modification; wherein the modified surface formed by the in-situ surface modification is selected from any one of nano-zero-valent iron, iron oxide, and iron sulfide; the iron-based thin-film probe is used to simulate the adsorption, distribution, and redox reactions of iron-containing mineral micro-interface pollutants in soil.

The application provides a preparation method of a sodium ferrous disulfide catalyst and application of the sodium ferrous disulfide catalyst in direct coal liquefaction, and relates to the technical field of coal liquefaction.The preparation method of the sodium ferrous disulfide catalyst comprises the following steps: mixing a ferric salt solution and a Na2S solution or a NaHS solution, performing a precipitation reaction, and obtaining a precipitation reaction system; and aging the precipitation reaction system, and performing solid-liquid separation to obtain the sodium ferrous disulfide catalyst.The preparation method of the NaFeS2 catalyst is simple in process, mild in preparation condition, does not need heating and pressurization, has a wide source of raw materials, is low in cost, and is easy to be industrialized.The obtained sodium ferrous disulfide has high catalytic activity as a catalyst for direct coal liquefaction, and the oil yield and conversion rate of direct coal liquefaction are higher than those of a catalyst used in the industry at present.

The invention relates to the field of water and soil pollution treatment, in particular to a method for reinforcing and fixing hexavalent chromium pollutants based on iron oxide in-situ vulcanization coupling organic matter, which comprises the following steps: step 1, injecting a vulcanizing agent into a hexavalent chromium polluted area, so that in-situ iron oxide minerals are subjected to vulcanization modification to generate modified minerals; 2, a natural organic acid solution is injected and reacts with the modified minerals, the fixing efficiency on hexavalent chromium is enhanced, and an iron sulfide oxide mineral-organic composite repairing material is generated in situ; and 3, the iron sulfide oxide mineral-organic composite repairing material reacts with hexavalent chromium, trivalent chromium precipitates are generated, and long-acting fixation of hexavalent chromium is achieved. The remediation efficiency and the application range of hexavalent chromium are remarkably improved, meanwhile, the method has the advantages of being simple and convenient in process, low in cost, environmentally friendly and the like, the method is particularly suitable for large-scale site remediation and practical engineering application, and a reliable technical means is provided for soil and underground water chromium pollution treatment.

This invention patent application addresses a system for the detection and quantification of mineralogical species via x-ray diffraction (XRD) of the concentrate of dry copper before it is injected into a converter or melting furnace. Specifically, it addresses a device that performs a mineralogical analysis, in line and in real time, of the concentrate of copper in the bath smelting furnace via x-ray diffraction (XRD), which allows for control over the ideal mixture for the optimal process for copper sulfide (Cu2S)-white metal, iron sulfide (FeS)-Slag and pyritic sulfur (S2)-temperature.

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 relates to the technical field of land pollution treatment, solves the problem that in the prior art, when a large-area medium polluted by hexavalent chromium is treated, the addition amount of ferrous sulfide is prone to being inaccurate, and consequently the remediation effect is not ideal, and provides ferrous sulfide particles with shells and a preparation method and application of the ferrous sulfide particles. The prepared ferrous sulfide particles with the shells can keep efficient removal of chromium within the pH value range of 5-9, the problem that the adsorption behavior of a traditional model in a low-chromium-concentration area is difficult to predict is effectively solved by means of a correction adsorption model with higher fitting precision, and therefore the actual demand quantity of target repairing liquid can be accurately predicted, and the application prospect is wide. The target repairing liquid can be injected more accurately, and excessive or insufficient injection is avoided. After hexavalent chromium is reduced into trivalent chromium by ferrous sulfide, the trivalent chromium and carboxymethyl cellulose can form a stable chelate, and zero-valent sulfur can also form a compact passivation layer on the surface of a polluted medium, so that the trivalent chromium is prevented from being reoxidized, and long-term stable repair of hexavalent chromium is realized.

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.

This application relates to the fields of petroleum processing catalysts and solid waste resource utilization technology, specifically disclosing an iron sulfide catalyst for heavy oil hydrocracking and its application. The active component of this iron sulfide catalyst for heavy oil hydrocracking includes non-stoichiometric iron sulfide Fe obtained from coal combustion dust through magnetic separation. 1‑x S, where x ≤ 0.2. The iron sulfide catalyst Fe for heavy oil hydrocracking of this application. 1‑x S has a unique hexagonal crystal structure and surface properties. When used as a catalyst for heavy oil hydrocracking, it has significantly better catalytic efficiency than traditional hydrocracking catalysts, lower cost, longer service life, and stronger resistance to carbon buildup.

The invention discloses a pyrite-based composite positive electrode material, a preparation method thereof and an application of the pyrite-based composite positive electrode material in an all-solid-state battery, the preparation method of the pyrite-based composite positive electrode material comprises the following steps: (1) carrying out oscillation ball milling treatment on pyrite square crystals to obtain iron sulfide fine powder; (2) mixing lithium sulfide and lithium iodide, and then carrying out high-energy ball milling treatment to obtain a lithium-iodine-sulfur amorphous mixture; and (3) mixing the iron sulfide fine powder and the lithium-iodine-sulfur amorphous mixture, and then carrying out high-energy ball milling treatment to obtain the pyrite-based composite positive electrode material. The pyrite-based composite positive electrode material is combined with a solid electrolyte membrane and a lithium-indium negative electrode, so that a high-capacity and low-attenuation pyrite composite positive electrode sulfide all-solid-state battery can be prepared, and high specific capacity and long circulation performance are shown.

The invention relates to a method for detecting effective heavy metal elements in soil, which comprises the following steps: (1) mixing and extracting a soil sample and a soil extracting agent to obtain an extracting solution; mixing the extracting solution and an oxidizing agent, and performing photolysis to obtain a to-be-detected sample; (2) mixing the iron sulfide nano-material modified paper base with the sample to be detected in the step (1), enriching and precipitating the available heavy metal elements, then detecting the enriched and precipitated iron sulfide nano-material modified paper base by adopting a laser-induced breakdown spectroscopy technology, and determining the content of the available heavy metal elements on the basis of a calibration curve of the available heavy metal elements. The content of the effective heavy metal elements in the soil is obtained. According to the method, the iron sulfide nano material modified paper base is used for enrichment and precipitation of the effective heavy metal elements in the soil leaching solution subjected to ultraviolet photolysis, then the LIBS technology is adopted for detection, and high-sensitivity and high-accuracy rapid detection of the effective heavy metal elements Cu, Cd and the like in the soil is achieved.

The invention discloses an impurity-reducing and quality-improving flotation method for arsenic-containing and lead-containing low-grade copper ore and application, and the flotation method is specifically used for separating and recycling pyrite minerals of the ore through primary ore grinding, two times of roughing, at least two times of scavenging, secondary ore grinding and at least five times of concentration. Two-stage roughing is matched with staged precise dosing, agent waste is avoided, it is guaranteed that slow-floating target minerals enter fine selection, gangue inclusion is reduced, and the grade and the recovery rate are improved; and a collecting agent hydrophobic membrane on the surface of the mineral is removed through secondary grinding, the monomer dissociation degree is improved, favorable conditions are created for impurity inhibition, and the separation precision is optimized. The high-selectivity copper collecting agent is matched with a lead and sulfur combined inhibitor, the problem that the effect of a single inhibitor is poor is solved, galena, iron sulfide and arsenopyrite are synergistically inhibited, and the content of lead and arsenic is greatly reduced. The agent is nontoxic and environment-friendly, equipment blockage and corrosion are reduced, the wastewater treatment cost and the environmental influence are reduced, and the unification of quality improvement, efficiency improvement, environmental protection and economy is realized.

The utility model discloses a treatment system for reducing the pressure difference of a solvent regeneration tower, which comprises a solvent regeneration tower, a first cooling device, a second cooling device and a regeneration tower top reflux tank, gasified hydrogen sulfide and acidic water are separated from the solvent regeneration tower, and the gasified hydrogen sulfide and acidic water are separated from the regeneration tower top reflux tank after passing through the first cooling device and the second cooling device. The acidic water is liquefied, hydrogen sulfide is discharged from the top return tank of the regeneration tower, the acidic water flows back into the solvent regeneration tower, a filter device is arranged between the top return tank of the regeneration tower and the solvent regeneration tower, impurities in the acidic water are purified after passing through the filter device, and the purified acidic water returns to the solvent regeneration tower. The method has the advantages that solid impurities such as iron sulfide mixed in the acidic water are removed, and the conditions of pressure drop of the solvent regeneration tower, poor desulfurization effect of the solvent regeneration tower and the like in the subsequent reaction process are effectively avoided.

This invention discloses a transition metal sulfide@wood charcoal self-supporting electrode material, its preparation, and its application. The invention involves carbonizing delignified wood in an inert gas atmosphere to obtain three-dimensional porous conductive wood charcoal; dispersing a nickel and iron source in a solvent to obtain a mixed solution A; subjecting the wood charcoal to a hydrothermal reaction in mixed solution A to obtain wood charcoal loaded with metal double hydroxides; dispersing a molybdenum and sulfur source in a solvent to obtain a mixed solution B; and subjecting the wood charcoal loaded with metal double hydroxides to a hydrothermal reaction in mixed solution B to obtain a wood charcoal electrode loaded with molybdenum sulfide and nickel-iron sulfide nanosheets, which is the transition metal sulfide@wood charcoal self-supporting electrode material. This invention utilizes a simple two-step hydrothermal method to synthesize the transition metal sulfide@wood charcoal self-supporting electrode material, constructing a heterostructure of molybdenum sulfide and nickel-iron sulfide nanosheets, thereby improving electrocatalytic activity and stability.

The application discloses a MOFs derived iron sulfide heterogeneous electro-Fenton catalyst, a preparation method thereof and application of the catalyst in degradation and removal of organic pollutants. The preparation method of the catalyst is as follows: iron metal organic framework material MOFs and sublimed sulfur are mixed, supercritical technology is used to make the sulfur easily enter the MOFs material channel, and then calcination is performed to make the MOFs framework collapse, and the sulfur element reacts with the metal iron element to generate iron sulfide, so that the electron transfer efficiency of the material is further improved, and the pH of the Fenton reaction is widened. The catalyst synthesis process is simple, convenient and controllable, the prepared granular catalyst is applied to a heterogeneous electro-Fenton system, has good catalytic effect, and overcomes the defect that a traditional electro-Fenton catalyst is difficult to recover. The method provides an innovative method for a heterogeneous electro-Fenton cathode.

A process for preparing a compound of formula (NaOH)x[Fe(OH)2]yFeS, may include: (a) mixing iron and sodium sulfide in equimolar amounts, in an NaOH aqueous solution; (b) heating the obtained mixture up to a temperature in a range of from 110 to 210° C. for a duration in a range of from 1 hour to 1 week; and (c) recovering the active material by filtering and drying in a neutral atmosphere.

The invention belongs to the technical field of environmental functional material preparation and heavy metal pollution control, and particularly relates to a method for preparing sulfurized nano zero-valent iron (S-nZVI) based on low-sulfite rheological phase reaction and application of the S-nZVI in heavy metal wastewater treatment. The method comprises the following steps: mixing and grinding an iron source and a low sulfite solid according to a certain molar ratio to form a rheological phase precursor; in the presence of inert atmosphere and trace water, heating in a closed reactor to perform rheological phase reduction reaction, so that S-S bonds in the low sulfite are broken to release electrons, iron ions are reduced into Fe (0) cores, iron sulfide layers are synchronously formed on the surfaces of the Fe (0) cores, and after the reaction is finished, cooling, washing and drying are performed to obtain the S-nZVI with the core-shell structure. The material has the characteristics that the specific surface area is high (greater than or equal to 85 m / g), the Fe (0) core size is 5-20 nm, and the outer layer is an amorphous iron sulfide layer, and has efficient adsorption capacity on heavy metal ions such as Cr (VI), As (III), Pb (II), Cd (II) and the like. The method is simple in process, green, efficient and low in cost, and a new scheme is provided for heavy metal wastewater treatment and recycling.

The application discloses an oxygen-doped cobalt-iron sulfide composite material and a preparation method and application thereof, wherein the oxygen-doped cobalt-iron sulfide composite material comprises: a conductive substrate and an oxygen-doped cobalt-iron sulfide grown on the conductive substrate. The conductive substrate can be directly used as an electrode while increasing the conductivity of the material, facilitating the electrocatalytic hydrogen evolution reaction of the catalyst; the introduction of the Fe element causes the electron transfer of Co to Fe, regulates the electronic structure of CoS2, improves the conductivity of the catalyst, the further doping of O causes the electron redistribution, increases the electron density of S, promotes the adsorption of H at the S site, and significantly reduces the S site of the catalyst H* , thereby reducing the energy barrier of HER and accelerating the hydrogen evolution reaction. Tests prove that the oxygen-doped cobalt-iron sulfide composite material has excellent HER catalytic activity and persistent electrochemical stability.

This invention relates to the field of biomedical technology, and in particular to a method for preparing and applying a nanomedicine for treating deep endometriosis. The method involves mixing ferrous ammonium sulfate, trisodium citrate, and polyethyleneimine, then adding thioacetamide and triethanolamine via a solvothermal reaction to obtain two-dimensional iron sulfide nanosheets. Dopamine hydrochloride is then added and stirred at room temperature in anhydrous ethanol to obtain polydopamine-coated iron sulfide (FP). FP is then mixed with larotrectinib and anhydrous ethanol to obtain the nanomedicine FPL for treating deep endometriosis. The synthesis method of this invention is simple and highly operable; the product is stable and reproducible; FPL exhibits good biocompatibility and biodegradability. After entering the microenvironment of deep endometriosis lesions, it can responsively release larotrectinib, effectively inhibiting the Trk signaling pathway and significantly reducing the degree of nerve infiltration; simultaneously, the anti-inflammatory effect of the FP carrier alleviates the local inflammatory response, jointly inhibiting lesion progression.

The invention relates to the technical field of petroleum processing catalysts and solid waste recycling, and particularly discloses an iron sulfide catalyst for heavy oil hydrocracking and application of the iron sulfide catalyst. The invention relates to an iron sulfide catalyst for hydrocracking heavy oil, the active component of the iron sulfide catalyst comprises non-stoichiometric iron sulfide Fe < 1-x > S obtained by magnetic separation from coal combustion dust, and x is less than or equal to 0.2. The iron sulfide catalyst Fe < 1-x > S for hydrocracking of heavy oil has a unique hexagonal crystal structure and surface properties, has the catalytic efficiency obviously superior to that of a traditional hydrocracking catalyst when being used as a catalyst for a hydrocracking reaction of heavy oil, and has the advantages of lower cost, longer service life and stronger carbon deposition resistance.

The invention discloses a method for enhancing denitrification of nano-iron adaptive microorganisms, and belongs to the technical field of water pollution control. The method comprises the following steps: preparing extracellular polymeric substance (EPS) and iron sulfide co-doped modified nano-iron (E (at) SnZVI) through a mechanical ball milling method or a liquid phase chemical reduction-co-precipitation method; the method comprises the following steps: adjusting the pH value of nitrate-containing wastewater to be treated to 5.0-7.0; (2) adding the E (at) SnZVI prepared in the step (1) into the wastewater according to the adding amount of 150 mg / L, inoculating domesticated denitrifying bacteria mixed liquor (MLSS is 3000 mg / L), and controlling the C / N ratio of the system to be 2-5; reacting under an anoxic condition, and monitoring the concentration change of nitrate, nitrite, ammonia nitrogen and nitrogen in the system until the reaction is balanced. In the wastewater with low carbon-nitrogen ratio (C / N = 2), the reaction period is shortened from more than 24 hours to 4-8 hours, and the method is suitable for a continuous flow treatment process. EPS is natural secreta of microorganisms, FeSx is low in toxicity, reaction products are iron oxide and nitrogen, and secondary pollution is avoided; no additional carbon source is needed, and the policy requirements of pollution reduction and carbon reduction are met.

A method may include introducing a metal sulfide mitigation package comprising a hydroxysultaine dispersing agent, a water-wetting surfactant, and a corrosion inhibitor into a wellbore; contacting a metal sulfide scale in the wellbore with the metal sulfide mitigation package; and dissolving at least a portion of the metal sulfide scale with the metal sulfide mitigation package.

The application discloses a non-acid scale dissolver for removing iron sulfide scale in a wellbore, which comprises the following components in mass ratio: a main agent, hexaazacyclic compound, 20-40%; an auxiliary agent, organic phosphonate, 15-35%; a penetrating agent, non-ionic surfactant, 1-5%; and water, the rest. The application also discloses a preparation method of the non-acid scale dissolver, which comprises mixing and stirring the raw materials and adjusting the pH value to obtain the non-acid scale dissolver. The scale dissolving rate of the scale dissolver to iron sulfide reaches more than 80%, which is close to the scale dissolving efficiency of an acid scale dissolver, and the scale dissolver is neutral, which is low in corrosion to the wellbore in the plugging removal process, and overcomes the serious corrosion problem caused by the traditional acid scale dissolver in the plugging removal process.

The application belongs to the field of sodium ion batteries, and discloses a preparation method of a carbon-confined tin-iron sulfide composite material and application thereof. The application prepares an iron hydroxyl stannate oxide precursor through a mechanical chemical reaction, realizes construction of a carbon composite structure through secondary ball milling, and finally obtains a tin-iron sulfide carbon composite material through gas phase sulfuration. The method has the advantages of simple preparation, solvent-free production in the preparation process, green environmental protection, high yield and the like. The tin-iron sulfide carbon composite material obtained finally has excellent cycle performance and rate performance when used as a negative electrode material of a sodium ion battery.