163results about "Iron sulfides" patented technology

The present application relates to the field of lithium-ion battery preparation, and provides a method for synthesizing a ferrous sulfide material from a pyrite raw material and an application. A pyrite raw material is crushed and then physically mixed with iron powder and carbon source powder, and is heated in an inert atmosphere to obtain ferrous sulfide powder; the ferrous sulfide powder is mixed with deionized water and then subjected to wet ball milling and high-speed fine grinding to obtain a ferrous sulfide suspension; then, the ferrous sulfide suspension is spray-dried to obtain a precursor of ferrous sulfide microspheres, and the precursor is annealed to obtain a ferrous sulfide material. In the present application, the ferrous sulfide material is applied to a lithium-ion battery to serve as an active material of a negative electrode. By introducing a reducing agent, the present application can solve the problem in conventional methods that pyrite cannot be directly used to synthesize ferrous sulfide due to the presence of an impurity phase. In addition, the present application involves low costs, a simple process and low energy consumption, and is environmentally friendly and easy to realize large-scale production.

The invention provides a preparation method of sulfurized zero-valent iron doped with sulfur in an iron body phase, which comprises the following specific steps: S1, adding zero-valent iron, ferrous sulfide and pyrite into alcohol, and uniformly stirring to obtain slurry to be ground; s2, a grinding tank of a wet-process ball mill is filled with grinding beads, the slurry to be ground is added into the wet-process ball mill to be ground, vulcanized zero-valent iron particles are obtained, the grinding time is 40-640 min, the rotating speed of the wet-process ball mill is 1800-2200 rpm, a stirrer is arranged in the grinding tank, and the rotating speed of the stirrer is 100-140 rpm; s3, taking out the sulfurized zero-valent iron particles from the wet ball mill, and putting the sulfurized zero-valent iron particles into magnetic separation equipment for separation; and S4, the separated sulfurized zero-valent iron particles are washed with ethyl alcohol and placed in a vacuum drying box to be dried at the temperature of 55-65 DEG C.

Methods of flash-within-flash (FWF) Joule heating and the systems thereof. The FWF Joule heating process subjects outer feedstock in an outer vessel to a flash Joule heating process, whereby the flash Joule heating process upon the outer feedstock results in the conversion of inner feedstock within an inner vessel (which inner vessel is within the outer vessel) to a converted material.

The invention discloses a process method for preparing high-spinning nano pyrite through physical field-chemical method coupling regulation and control, which comprises the following steps: dissolving bovine serum albumin in deionized water, adding an iron source, uniformly mixing, adjusting the pH value of the solution to 10.0-11.0, adding a sulfur source, and uniformly mixing, thereby obtaining the high-spinning nano pyrite. Carrying out a coupling regulation reaction of a physical field and a chemical method on the reaction system under the protection of inert gas, and then dialyzing and purifying to prepare the high-spin-state FeS2 nanosheet. The chemical method comprises one or more of a coprecipitation method, a solvothermal method and a hydrothermal method; the physical field comprises one or more of an alternating magnetic field, a static magnetic field and a rotating magnetic field. Through coupling regulation and control of a physical field and a chemical method, accurate conversion of the FeS2 nanosheet from a low spinning state to a high spinning state is realized, chemical doping can be effectively avoided, natural biological suitability of FeS2 is reserved, and the method has a good clinical conversion application prospect.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a composite positive electrode material for a lithium ion battery and a preparation method of the composite positive electrode material. The composite positive electrode material is composed of a positive electrode base material, a lithium supplementing material and a catalytic material. The preparation method comprises the following steps: (1) preparing a composite material of the positive electrode base material and the lithium supplementing material in situ; and (2) dispersing the catalytic material on the surface of the composite material of the positive electrode base material and the lithium supplementing material, and forming a stable interface layer between the catalytic material and the lithium supplementing material. According to the method disclosed by the invention, the lithium supplementing material has double functions of surface modification of a positive electrode base material and lithium supplementing of a negative electrode, and meanwhile, the first effect and the cycling stability of the battery are improved; a catalytic material is introduced to the surface of the lithium supplementing material, free O generated by the lithium supplementing material Li is fixed in situ, the bag expansion phenomenon of the battery is relieved, and the cycling stability and safety of the battery are further improved; the preparation process is simple, raw materials are cheap and easy to obtain, the production cost is low, and industrial production and popularization are easy.

The invention relates to the technical field of wastewater treatment, in particular to a method for recovering copper from industrial acid wastewater. The method comprises the following specific steps: sulfur concentrate activation: grinding, acid leaching, washing and drying blocky sulfur concentrate in sequence for later use; selective recovery of copper: taking a certain amount of copper-containing industrial acidic wastewater, adding the treated sulfur concentrate into the zinc industrial acidic wastewater, and uniformly stirring to obtain mixed slurry; and solid-liquid separation is conducted, specifically, a certain amount of flocculating agent is added into the obtained mixed slurry for solid-liquid separation, and supernate and copper-containing concentrate are obtained. The copper grade in the copper-containing concentrate is not lower than 10%, and the copper-containing concentrate can be directly sold or sold after simple flotation. The method has the advantages of simple and easy process, low equipment requirement, convenience in operation, wide application range and the like, and has good social benefits and economic values.

The invention provides a pretreated biomass charcoal loaded vulcanized nano zero-valent iron material as well as a preparation method and application thereof, and relates to the technical field of environmental functional materials. The preparation method comprises the following steps: firstly, dipping pretreated biomass in phosphoric acid, pyrolyzing, and then ball-milling and crushing to micro-nano scale; then, FeCl3 is used as a precursor, NaBH4 and Na2S2O4 are used as a reducing-vulcanizing agent, and S-nZVI is loaded through a one-step method. The composite modified material has high efficiency in heavy metal pollution in a water body, can simultaneously remove various pollutants, has a wide application prospect, and provides a new efficient material choice for the field of environmental restoration.

The invention provides copper-doped iron sulfide as well as a preparation method and application thereof, and the preparation method of the copper-doped iron sulfide comprises the following steps: S1, preparing a metal salt solution from iron nitrate and copper nitrate; wherein in the metal salt solution, the sum of the molar concentration of iron ions and the molar concentration of copper ions is 0.003 mol / 25 ml to 0.06 mol / 25 ml; s2, dissolving a sulfur source in a metal salt solution to obtain a mixed solution, heating the mixed solution to 120-180 DEG C under a high-pressure condition, carrying out heat preservation for 12 hours, and separating solids in the mixed solution to obtain copper-doped iron sulfide; the molar concentration of the sulfur source in the mixed solution is 0.01-0.1 mol / 50ml; or, the metal salt solution is heated to 120-180 DEG C under the high-pressure condition, heat preservation is conducted for 12 h, a precursor is obtained, the precursor and elemental sulfur are mixed and then heated to 400 DEG C, heat preservation is conducted for 2 h, and the copper-doped iron sulfide is obtained. The adsorption capacity of the ferric sulfide mercury is improved, and meanwhile, the method has a remarkable economic advantage in the aspect of HgO removal.

A method for recycling a copper-containing wastewater from a micro-etching is provided, including: modifying a FeS material with a monomer including both carboxyl and sulfhydryl, a crosslinking agent, and a stabilizing and dispersing agent to obtain a FeS-based pH-responsive material CMC-FeS@HS #SiO2 #COOH, adding the FeS-based pH-responsive material to weakly-acidic copper-containing wastewater from the micro-etching to allow a reaction, and conducting processes such as sulfide precipitation, exchange, adsorption complexation, and flocculation precipitation to finally obtain a precipitate with CuS as a main component. This method makes full use of the pH responsiveness and abundant surface active sites of the FeS-based pH-responsive material, and can control a recovery rate of copper ions in the wastewater at 99.8% or more merely by adjusting a pH value of the copper-containing wastewater from the micro-etching.

The utility model discloses a ferrous sulfide passivation device which comprises a passivation box and a movable door hinged to one side of the passivation box. The spraying mechanism is arranged in the passivation box and comprises a sieve plate fixedly mounted at the bottom of an inner cavity of the passivation box, and a placement frame is arranged at the top of the sieve plate; according to the scheme, the spraying assembly and the linkage assembly are matched with each other, the spraying area of the vulcanizing machine can be increased during passivation of ferrous sulfide, meanwhile, the fixing ring can be driven to rotate through meshing connection of an asymmetric gear and a linkage gear in the spraying process, ferrous sulfide moves during passivation, and the passivation efficiency of ferrous sulfide is improved. Therefore, the passivation uniformity of ferrous sulfide is further improved while the spraying area is increased.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

The application discloses a pyrite-based composite positive electrode material, a preparation method thereof and application of the pyrite-based composite positive electrode material in a full-solid-state battery, and relates to the technical field of battery materials. The preparation method of the pyrite-based composite positive electrode material comprises the following steps: (1) performing shock ball milling treatment on pyrite block crystals to obtain iron sulfide powder; (2) mixing lithium sulfide and lithium iodide, and then performing high-energy ball milling treatment to obtain a lithium iodine sulfur amorphous mixture; and (3) mixing the iron sulfide powder and the lithium iodine sulfur amorphous mixture, and then performing 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, and a pyrite composite positive electrode sulfide full-solid-state battery with high capacity and low attenuation can be prepared, and the pyrite composite positive electrode sulfide full-solid-state battery exhibits high specific capacity and long cycle performance.

The invention 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, and the preparation method comprises the following steps: (1) mixing copper salt, potassium ferricyanide, a nitrogen source and polyethylene glycol, and carrying out ball milling to obtain a copper-iron Prussian blue precursor; (2) pyrolyzing the copper-iron Prussian blue precursor in an inert atmosphere, washing to remove impurities, and drying to obtain an intermediate product; and (3) carrying out heat treatment on the intermediate product and a sulfur source in an inert atmosphere to obtain the copper-iron sulfide / nitrogen-doped porous carbon composite material. Through the synergistic effect of compounding of the bimetallic sulfide and the nitrogen-doped porous carbon, sodium ions with larger ion radiuses are more easily embedded and deembedded in interlayer spacing, and meanwhile, abundant active sites are provided to enhance the storage of the ions, so that the lithium ion battery has outstanding rate capability and stable cycle performance.

The invention discloses a method for degrading agricultural non-point source organic pollutants by utilizing a ferroferric sulfide-peracetic acid system and application of the method. The ferroferric sulfide adopted by the invention shows the efficient redox cycle characteristic of Fe (Fe < 2 + > / Fe < 3 + >) and S (S < 2-> / Sn < 2->), the cycle performance of the material is efficient, and the defects that the degradation of pollutants is not ideal and the pollutants are difficult to recover when the existing material is used for activating persulfate or peracetic acid in a water treatment technology are overcome; in addition, in the degradation process, the system has good anti-interference capability on common ions and organic matters in the environment. Peroxyacetic acid is used for adjusting the pH value, no extra acid or alkali needs to be added, and the application range is wide. The reaction can be carried out at normal temperature and normal pressure, and the method has a good application prospect in the field of water pesticide pollutant remediation.

This invention discloses a cubic spinel-structured sulfide composite gas-sensitive material, a gas sensor, its preparation method, and its application, belonging to the field of gas sensor technology. The preparation method of this composite gas-sensitive material involves using FeCl2, CdCl2, and InCl3 as metal sources, and thiourea as a sulfur source, placing them together in a solvent of water, adding citric acid or sodium citrate as a dispersant, and obtaining a precursor material through a hydrothermal reaction. After calcination and annealing, a cubic spinel-structured FeIn2S4 / CdIn2S4 heterojunction material powder is obtained. The two gold electrodes and the ceramic tube of the gas sensor are coated with the cubic spinel-structured sulfide composite gas-sensitive material. The gas sensor based on this invention, made from a cubic spinel-structured sulfide composite gas-sensitive material, has a simple manufacturing process, low production cost, and is suitable for industrial mass production. It has broad application prospects in the field of acetone detection in trace hazardous situations.

The invention relates to the technical field of electrochemical uranium extraction, in particular to a uranium extraction method based on electrochemical mediation FeS active site regeneration. According to the specific technical scheme, under the anaerobic condition, a nano FeS modified working electrode is prepared on a carbon-based material through in-situ deposition, and a corresponding electrochemical uranium extraction system is constructed. The system operates at room temperature and low energy consumption, and U (VI) is efficiently reduced into low-toxicity and indissolvable tetravalent uranium and enriched on the surface of an electrode through efficient adsorption and coordination effects of FeS active sites on uranyl ions and driving of cathode potential. According to the uranium extraction method of the nano FeS in-situ modified carbon cloth electrode provided by the invention, consumed FeS active sites are regenerated in situ by utilizing an electrochemical method, and the high activity and long-term stability of the electrode are maintained. The method shows high extraction capacity, high selectivity and excellent cycle performance for uranium in uranium mine wastewater and seawater, and provides a reliable way for efficient and sustainable uranium resource recovery.

The invention provides a method for preparing a sulfide heterogeneous foam carrier from foam metal and application, and the method comprises the following steps: placing a sulfur source in a porcelain boat, placing the foam metal in another porcelain boat, placing the two porcelain boats in a quartz tube, and placing the quartz tube in a tubular furnace, placing a porcelain boat filled with a sulfur source at the upstream, close to a gas inlet, of a tubular furnace, and placing a porcelain boat filled with foam metal at the center of the tubular furnace; sealing the tubular furnace, continuously introducing inert gas to keep inert atmosphere, and then heating the tubular furnace to 400-800 DEG C for reaction; and after the reaction is completed, continuously introducing inert gas, reducing the temperature of the tubular furnace to room temperature, and taking out a product, namely the sulfide heterogeneous foam carrier.

The present application belongs to the field of metallurgy, and relates to a method for producing antimony white by directly oxidizing crude antimony, comprising the following steps: S1, mixing crude antimony with crude antimony alloy, and reacting under an oxygen-containing atmosphere, to obtain oxidized slag and a melt after the reaction is completed; S2, adjusting the temperature of the melt, and then introducing compressed air to react, to produce antimony trioxide-containing flue gas, and to obtain antimony oxide slag after the reaction is completed. The present application makes full use of impurities such as sodium sulfide, sodium hydroxide and sodium thiosulfate contained in crude antimony, and innovatively uses these components for arsenic removal reaction, which not only avoids the cumbersome steps of adding various auxiliary materials in the traditional process, but also enables the original sodium sulfide, sodium hydroxide and sodium thiosulfate in the crude antimony to fully play a synergistic role, showing excellent performance in arsenic removal effect, thus simplifying the process flow, significantly reducing the production cost, and realizing the dual improvement of economic benefit and process efficiency.

A method for treating polluted acidic wastewater from smelting with an activated pyrite concentrate includes: drying and grinding a pyrite concentrate, and washing twice to produce a washed pyrite concentrate powder; mixing the washed pyrite concentrate powder with a Na2S powder to produce a mixed powder, and adding purified water; allowing a reaction for 3.5 h to 4.5 h; filtering to produce an activated pyrite concentrate; subjecting the activated pyrite concentrate to aeration and standing, drying, and grinding to produce an activated pyrite concentrate powder; adding a lime slurry to the wastewater to adjust a pH; adding the activated pyrite concentrate powder, and allowing an ultrasonic treatment, continuous stirring is conducted; allowing a settlement to produce a first supernatant; adding a lime slurry to the first supernatant to adjust a pH; further allowing a settlement to produce a second supernatant; and separating the second supernatant.

The present invention belongs to the field of the development of new adsorbents and comprehensive utilization of resources, and discloses a preparation method of an inorganic tin sulfide adsorbent and its application in cesium extraction. The adsorbent is synthesized by a hydrothermal method and has a lamellar structure. It has excellent ion exchange performance for alkali metal cesium ions in an aqueous solution and exhibits excellent adsorption selectivity. The adsorbed material can be regenerated, thus realizing the recycling of the adsorption material. The preparation process of the adsorption material provided by the present invention is simple and low in cost. Therefore, the adsorption material prepared by the present invention can be used for the extraction of cesium in geothermal water, salt lake brine, and underground brine, and can also be applied to the separation and extraction of cesium in solid cesium ore or associated ore leaching solutions.

The present invention relates to the technical field of electrocatalytic materials, and in particular to an OER electrocatalyst and a preparation method thereof, the preparation method comprising: adding an iron salt, a nickel salt, a nitrogen source and a foam nickel substrate to water to obtain a mixed solution; reacting the mixed solution under preset temperature conditions to obtain a precursor; and sulfurizing the precursor to obtain the OER electrocatalyst. In the present invention, the precursor with a nanoflower morphology formed in the hydrothermal process still retains the morphological characteristics of the nanoflowers in the high-temperature sulfurization process, which allows enough active sites to be fully exposed. The heterogeneous interface (Fe3S4 / Ni(OH)2) in the electrocatalyst has a synergistic effect, which improves the charge distribution on the catalyst surface, accelerates the electron transfer rate, and effectively improves the OER catalytic activity. In the stability test under high current density, the Fe3S4 / Ni(OH)2 / NF catalyst also showed excellent long-term stability. At a current density of 100mA cm ‑2 It can work stably for 100 hours.

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 invention provides a composite negative electrode material for an iron-nickel secondary battery as well as a preparation method and application of the composite negative electrode material. The composite negative electrode material for the iron-nickel secondary battery is prepared by adopting a method comprising the following steps: mixing iron salt, a sulfur source, polyvinylpyrrolidone and a solvent, and carrying out solvothermal reaction to obtain a precursor; and pyrolyzing the precursor in protective gas to obtain the catalyst. The method is simple and convenient in preparation process and controllable in reaction condition, and the obtained material has high specific capacity, excellent cycle life and rate capability and has a good industrial application prospect. The invention also provides the composite negative electrode material prepared by the method and application thereof.

The application relates to an artificial wetland filler and a preparation method and application thereof, and relates to the field of environmental treatment. The filler is composed of pyrite quantum dots PQD and carbon dots CDs. After the carbon dots CDs are made into powder, the powder is dissolved in distilled water, continuous magnetic stirring and boiling to 100 DEG C are carried out, immediately, pyrite quantum dots PQD with the same mass as the carbon dots CDs are added, stirring is carried out in dark conditions, after centrifugation, washing is carried out with distilled water, vacuum freeze-drying is carried out, and the PQD-CDs composite material is obtained. The filler can significantly enhance the pollutant removal efficiency, and has important significance for the treatment of farmland wastewater. The innovative method contributes to the improvement of the efficiency and sustainable development in the field of water treatment.

The invention discloses a method for preparing transition metal sulfides distributed in a sulfur-based composite material in a gradient manner, and belongs to the technical field of chemical power sources. When the sulfur-based composite material is prepared by a chemical reaction method, a self-assembly reaction occurs. Wherein the transition metal ions are continuously reduced along with the proceeding of the reaction, and the concentration is in a decreasing trend. The transition metal sulfide nanoparticles are distributed in the composite material in a gradient manner along with the proceeding of the reaction, so that the material core with slow dynamics can be compounded with more transition metal sulfides, and the gradient distribution catalyst can well fix sulfur and has very strong catalytic property on the conversion reaction of polysulfides; the shuttling of polysulfide is inhibited to a great extent. According to the technology, the negative influence of a polysulfide shuttle effect on battery circulation is greatly relieved, so that the performance of the battery is remarkably improved.

The embodiment of the invention relates to a transition metal sulfide graphite composite material as well as a preparation method and application thereof. The method comprises the following steps: dissolving a transition metal compound in a solvent, and mixing and stirring with a graphite raw material to obtain a mixture containing transition metal ions; performing heat treatment on the mixture at 700-1600 DEG C for 10-48 hours, so that a material with a cementite structure is formed in the heat treatment process of the mixture, transition metal ions are gradually diffused into the material, an onion carbon layer is formed on the outer layer of the material, and a primary carbonized material is obtained after crushing and grading; the primary carbonized material is subjected to heat preservation for 1-2 hours at the temperature of 600-2500 DEG C in a protective atmosphere environment, so that transition metal elements in the primary carbonized material escape through pore parts of the material, and a precursor material is obtained; and mixing the precursor material with sulfur powder, heating, and introducing a mixed gas containing a carbon source gas for chemical vapor deposition coating to obtain the transition metal sulfide graphite composite material.

The invention provides a three-dimensional self-supporting heterogeneous heterojunction electrocatalyst and a preparation method and application thereof.The three-dimensional self-supporting heterogeneous heterojunction electrocatalyst comprises a conductive substrate and a CoMoS3. 13 / FeS2 / Co3S4 heterojunction nanosheet growing on the conductive substrate, and the CoMoS3. 13 / FeS2 / Co3S4 heterojunction nanosheet is composed of three components including CoMoS3. 13, FeS2 and Co3S4. The three-dimensional self-supporting heterogeneous heterojunction electrocatalyst provided by the invention has relatively good water electrolysis catalytic activity and cycling stability under an alkaline condition.

The present invention relates to the field of biomedical technology, and particularly to a preparation method and application of an anti-hepatic fibrosis nano-drug. Ammonium ferrous sulfate, trisodium citrate and ethylene glycol are mixed to obtain solution A; solution A and a polyethyleneimine solution are mixed to obtain solution B; solution B and a thioacetamide solution are mixed to obtain solution C; solution C and triethanolamine are mixed and then reacted to obtain iron sulfide nanosheets; the iron sulfide nanosheets, SH-PEG-NH2 and absolute ethanol are mixed to obtain FP; FP, artemisinin and absolute ethanol are mixed to obtain the anti-hepatic fibrosis nano-drug. The synthesis method of FPA is simple and highly operable; the product is stable and has repeatability; FPA has good biocompatibility and biodegradability. After entering the hepatic fibrosis microenvironment, it responds to degrade highly expressed hydrogen peroxide, promotes the change of the hepatic fibrosis cell microenvironment, and then induces apoptosis.

The present invention relates to the use of iron- or zinc-based nanostructured compounds developed for use in water-based drilling fluids (WBDFs) and non-aqueous drilling fluids (NDFs). Furthermore, the present invention evaluates the H2S sequestration capacity of these nanostructured compounds and compares them to conventional metallic oxides and to other currently used sequestrants.