517 results about "Oxygen atmosphere" patented technology

The invention relates to the technical field of electro-catalysis oxygen evolution, and particularly discloses a nickel-molybdenum foam composite oxygen evolution electro-catalysis material with high-valence nickel induced by molybdate radicals and a preparation method of the nickel-molybdenum foam composite oxygen evolution electro-catalysis material aiming at the problem that an existing oxygen evolution electro-catalysis material is insufficient in comprehensive performance or poor in performance stability. Soaking in a NaCl aqueous solution, and taking out; s2, mixing the nickel-molybdenum alloy foam with a K3 [Fe (CN) 6] aqueous solution, heating, and carrying out a hydrothermal reaction; and S3, finally, the nickel-molybdenum alloy foam is placed in the air or oxygen atmosphere and heated to 350-450 DEG C, heat preservation treatment is conducted for 2 h, and the nickel-molybdenum foam composite oxygen evolution electro-catalysis material is obtained. Molybdate anions are adopted as a sustainable induction source to be coupled with a NixOy / Fe3O4 heterogeneous interface, integrated construction is achieved on a nickel-molybdenum foam framework, and the nickel-molybdenum foam composite material has the advantages of being low in overpotential, high in stability, high in activity, high in binding force and long-term in durability and meanwhile being simple in process, easy to amplify on a large scale and the like.

The invention relates to a method for preparing a hard carbon material from carbon dot heterogeneous cross-linked bituminous coal, a coal-based hard carbon material and application. The preparation method comprises the following steps: (1) soaking pretreated bituminous coal in an acid solution, washing to be neutral, and drying to obtain dry pulverized coal; (2) dispersing the carbon dots in an alcohol solvent for ultrasonic treatment to obtain a dispersion liquid; (3) mixing the dried pulverized coal obtained in the step (1) and the dispersion liquid obtained in the step (2), mechanically stirring, and drying to obtain a mixture; (4) performing low-temperature heating crosslinking on the mixture obtained in the step (3) in an oxygen-containing atmosphere so as to obtain a heterogeneous crosslinking product; and (5) performing high-temperature carbonization on the heterogeneous cross-linked product in an inert atmosphere to obtain the coal-based hard carbon material. The coal-based hard carbon material can be used as a sodium ion battery / potassium ion battery negative electrode, and has excellent sodium / potassium storage performance.

The invention relates to a method for recycling polyethylene plastic through catalytic oxidation cracking, and belongs to the technical field of plastic recycling. The method comprises the following steps: mixing a Co / Al2O3 catalyst, polyethylene plastic and water, and carrying out a catalytic reaction in an oxygen-containing atmosphere at a set temperature, so that the polyethylene plastic is converted into binary acid, thereby obtaining a reaction solution. The low-price Co / Al2O3 catalyst is applied to catalytic oxidation cracking of the polyethylene plastic, the polyethylene plastic is converted into the binary acid, the yield of the binary acid is stabilized at 70% or above and reaches 115% at most, and the Co / Al2O3 catalyst is low in price and low in cost. The low-cost and low-energy-consumption improvement of the yield of the binary acid converted from the polyethylene plastic through catalytic oxidation cracking is fully realized, and a new way is provided for the high-value conversion of the polyethylene plastic.

The invention provides sintering flue gas denitration activated carbon and a preparation method thereof.The preparation method comprises the steps that coal-based activated carbon raw material powder and an aqueous solution of a nitrogen-containing compound and a phosphorus-containing compound are evenly mixed, impregnated and dried, and a nitrogen-phosphorus co-doped precursor is obtained; blending the catalytic components to obtain raw material strips; primarily forming pores, and activating for the first time in a water vapor atmosphere; carrying out secondary loading and pore regulation, and carrying out secondary activation to obtain a secondary carbon body; and carrying out heat treatment on the secondary carbon body in an oxygen-containing atmosphere to convert the loaded metal precursor into a metal oxide. According to the invention, through a cascade catalytic network constructed by nitrogen and phosphorus doping and titanium, tungsten and vanadium oxides and an optimized pore channel formed by step-by-step activation of water vapor and carbon dioxide, the denitration efficiency of the catalyst breaks through 80% and is far higher than that of common activated carbon. The sintering flue gas denitration system has high activity and high stability, can greatly reduce the series number of denitration towers, obviously reduces the system resistance and operation energy consumption, and provides an efficient scheme for solving the problems of low sintering flue gas denitration efficiency and high cost.

The invention belongs to the field of battery materials, and particularly relates to a regenerated graphite fast charging material and preparation and application thereof.The preparation method comprises the steps that waste graphite is subjected to first-stage plasma treatment in an oxygen-containing atmosphere in advance and then subjected to second-stage plasma treatment in an ammonia-containing atmosphere, and first-stage modified graphite is obtained; performing ultrasonic treatment on the first-stage modified graphite in a modification liquid containing an N modifier to obtain second-stage modified graphite; performing first-stage polymerization on the second-stage modified graphite in a solution A containing a monomer 1 in a formula 1 and an initiator in advance, and then performing second-stage polymerization on the second-stage modified graphite in a solution B containing a monomer 2 and an oxidizing agent to prepare the regenerated graphite quick-charging material, the monomer 2 comprises at least one of a formula 2 and a formula 3. The method provided by the invention can strengthen ion and electron conduction pathways of the regenerated material, improve the transmission rate, remarkably strengthen the fast charging performance of the material, and further strengthen the stability and low-temperature performance of the material.

The invention belongs to the technical field of preparation of soft magnetic composite materials, and particularly relates to an insulation coating method and application of a soft magnetic powder material. The insulating coating method comprises the following steps: (1) uniformly mixing low-melting-point metal or alloy powder with silica sol, a silane coupling agent and a thermocuring resin glue solution to obtain coating slurry; and (2) uniformly mixing soft magnetic powder with the coating slurry obtained in the step (1), firstly performing hot-pressing curing molding at the temperature of 60-100 DEG C under a vacuum condition, and then performing hot-pressing sintering treatment at the temperature higher than the melting point temperature of low-melting-point metal or alloy powder and under an oxygen-containing atmosphere condition to obtain the insulated and coated soft magnetic powder material. According to the insulating coating method, the advantages of an organic material insulating coating method and an inorganic material insulating coating method are combined, the defects of the organic material insulating coating method and the inorganic material insulating coating method are overcome, and the stability and the insulating coating effect of the insulating coating layer are remarkably improved.

To provide a method for evaluating the degree of oxidation of an oxidized polymer material.SOLUTION: When a standard piece made of a non-oxidized polymer material is measured by a chemiluminescence method while being heated in an oxygen-containing atmosphere to obtain a first integrated emission amount A, and a specimen made of the oxidized polymer material is measured by the chemiluminescence method while being heated in an oxygen-containing atmosphere to obtain a second integrated emission amount B, the degree of oxidation of the specimen is evaluated on the basis of an emission change rate R=(A-B) / A.SELECTED DRAWING: None

The utility model provides refrigeration equipment. The oxygen adjusting device comprises an oxygen adjusting storage container and an electrolysis oxygen adjusting module, the oxygen adjusting module is arranged in the oxygen adjusting container so that the oxygen-rich atmosphere or the oxygen-poor atmosphere can be supplied to the oxygen adjusting container, the oxygen adjusting container comprises a first oxygen adjusting container body and a second oxygen adjusting container body, the first oxygen adjusting container body is arranged in the second oxygen adjusting container body, and the electrolysis oxygen adjusting module is arranged in the second oxygen adjusting container body. Or the second oxygen adjusting container is arranged in the first oxygen adjusting container. By means of the arrangement, the concentration of oxygen in the oxygen adjusting container can be adjusted, and meanwhile the equipment structure is more compact.

The invention discloses a non-noble metal ORR catalyst and a preparation method thereof, and belongs to the technical field of electro-catalysis. The method comprises the following steps: (1) adding 5, 10, 15, 20-tetra (4-cyanophenyl) porphyrin and nickel salt into an organic solvent, and synthesizing a supramolecular crystal precursor UPC-S7 through solvothermal reaction; (2) carbonizing the supramolecular crystal precursor UPC-S7 in an inert atmosphere to obtain a Ni-coated NC material; (3) oxidizing the Ni-coated NC material in an oxygen-containing atmosphere to obtain a Ni / NiO-coated NC material; and (4) sequentially soaking and etching the Ni / NiO-coated NC material by using a nitric acid solution and an ammonia water solution, and then washing and drying to obtain the non-noble metal ORR catalyst. The prepared catalyst does not contain precious metal such as platinum, the raw material cost is remarkably reduced on the basis of ensuring the ORR activity and stability of the catalyst, and a new scheme is provided for solving the cost bottleneck of a fuel cell.

The invention provides a method for co-processing multi-source copper-based waste through copper concentrate, and relates to the field of metal smelting. The copper concentrate and the copper-based waste are subjected to first mixing, and a mixture is obtained; under the oxygen-containing atmosphere, the mixture is smelted, and matte and smelting slag are obtained; the matte and the silicon-based slag former are subjected to first blowing to obtain first blowing slag; carrying out second mixing on the first converting slag and a reducing agent, and carrying out second converting to obtain crude copper; the copper concentrates comprise copper sulfide concentrates and copper oxide concentrates. Copper concentrate matte smelting and copper-based waste pyrogenic smelting are combined together, the problems that the copper-based waste smelting scale is small, and furnace burning is caused by overburning are solved, and the problem that a slag former is additionally added in copper concentrate matte smelting is solved. Through collaborative smelting, valuable metals such as copper, gold and silver enter matte, iron, aluminum and silicon in the copper-based waste enter smelting slag, and a silicon-based slag former and a reducing agent are added when the matte is blown, so that the slagging function is realized, and the valuable metals in the waste are recovered.

The invention relates to the technical field of sodium ion battery negative electrode materials, in particular to a method for preparing hard carbon from medium-temperature coal tar-based pitch, which comprises the following steps: (S1) hydrogenating the medium-temperature coal tar-based pitch and a hydrogen donor solvent at high temperature and high pressure to obtain hydrogenated pitch; (S2) mixing the hydrogenated asphalt with a Lewis acid catalyst, and oxidizing in an oxygen-containing atmosphere to obtain first oxidized asphalt; (S3) uniformly mixing the first oxidized asphalt and a modifier, and carrying out secondary oxidation crosslinking to obtain second oxidized asphalt; and (S4) uniformly mixing the second oxidized asphalt and a pore-forming agent, and carrying out heat treatment in an inert atmosphere to obtain the product hard carbon material. The hard carbon material prepared by the method disclosed by the invention is benefited from a specific preparation process, shows relatively high specific capacity and first coulombic efficiency, and also has excellent rate capability. The preparation method is simple, low in cost and easy for large-scale production, and lays a foundation for large-scale production of the sodium-ion battery negative electrode material.

The invention provides high-purity superfine titanium diboride and a preparation method thereof, and relates to the field of titanium diboride preparation. The method comprises the following steps: mixing boron oxide, titanium hydride, a carbon source, nano rare earth oxide and an organic solvent, and drying to obtain a mixture; in a vacuum environment, performing first roasting on the mixture to obtain a first roasted material; and in an oxygen-containing atmosphere, carrying out second roasting on the first roasting material to obtain the high-purity superfine titanium diboride. In the first roasting process, boron oxide, titanium hydride and a carbon source are completely melted and fully contacted, then further, the carbon source forms a carbon skeleton, the contact area between the melted boron oxide and titanium hydride and the carbon skeleton is further enlarged, liquid-liquid mixing and the increase of the contact area can reduce the reaction kinetic conditions, the reaction temperature is greatly reduced, and the reaction time is greatly shortened. The particle size of the generated titanium diboride is reduced, and the molten boron oxide and titanium hydride react on the porous carbon skeleton in a liquid-liquid form to generate the high-purity superfine titanium diboride.

The invention belongs to the technical field of third-generation semiconductor material defect control. According to the method for eliminating the silicon carbide small stacking fault based on high-temperature oxidation, a silicon carbide substrate is scanned and represented in a photoluminescence mode, and the target small stacking fault is accurately recognized and positioned; cleaning the substrate to remove surface impurities, performing high-temperature oxidation treatment in a dry oxygen atmosphere, and growing an oxide layer under control; constructing a composite interface stress field at an interface by utilizing thermal expansion coefficient mismatch and reaction molar volume expansion between the oxide layer and the substrate, and driving target stacking fault atom arrangement to generate directional reconstruction, so that the target stacking fault atom arrangement is converted into a matrix standard sequence; and finally, nitric oxide auxiliary annealing is carried out, and the reconstructed lattice configuration is solidified by utilizing a nitrogen passivation effect. The method is simple in process and high in compatibility, small stacking fault can be efficiently and stably eliminated, the silicon carbide substrate crystal quality is remarkably improved, and a guarantee is provided for preparation of a high-reliability power device.

The invention discloses an internal gettering process of a heavily boron-doped czochralski silicon epitaxial wafer, which comprises the following steps: 1) carrying out high-temperature pretreatment on a heavily boron-doped czochralski silicon wafer in an inert atmosphere, including high-temperature rapid heat treatment and high-temperature common heat treatment in sequence; 2) polishing the silicon wafer to eliminate a surface damage layer; and 3) depositing a lightly doped epitaxial layer or an intrinsic epitaxial layer to prepare the epitaxial wafer. After the epitaxial wafer is subjected to device manufacturing thermal process simulation in an oxygen atmosphere, gt can be formed on the near surface of the substrate; an inner gettering area with the BMD density larger than or equal to 5 * 10 < 9 > cm <-3 > is formed in the substrate body; the clean area guarantees the crystal quality of the epitaxial layer and prevents defects from extending to the active area; the inner gettering region enhances the inner gettering capability of the device on metal impurities, and reduces leakage current. The substrate of the epitaxial wafer formed by the method can be taken from any position of the self-weight boron-doped czochralski silicon single crystal ingot, so that the process is unified, the process integration complexity is reduced, and the waste of the crystal ingot is reduced.

The invention provides a volume photocuring three-dimensional printing method and device based on oxygen permeation interface dynamic oxygen inhibition control, and relates to the technical field of photocuring additive manufacturing. The volume photocuring three-dimensional printing method comprises the following steps that a resin cavity is prepared, the closed container is formed by compounding an oxygen permeable membrane and a transparent rigid material; establishing an oxygen inhibition layer: maintaining air or oxygen-containing atmosphere outside the closed container, so that oxygen continuously permeates into a resin boundary area through the oxygen permeation membrane to form the stable oxygen inhibition layer; volume light field projection: projecting a projection image generated by a computed tomography algorithm into the resin volume by adopting a calculation axial photoetching type multi-angle projection mode to realize multi-angle rotary projection exposure; edge curing is delayed through the boundary oxygen inhibition layer, the problem that the boundary light dosage of traditional volume printing is not uniform is solved, the final forming volume is enlarged by 1.5-3 times compared with the prior art, and the size bottleneck of volume light curing printing is effectively solved.

The invention belongs to the technical field of battery materials, and particularly relates to an asphalt-based hard carbon precursor, a hard carbon material and a preparation method and application of the asphalt-based hard carbon precursor and the hard carbon material. According to the method, protonic acid or lewis acid of a specific type and dosage is used as a catalyst to be mixed with the asphalt powder, and the reaction is carried out in an oxygen-containing atmosphere at a proper temperature, so that the synergistic promotion of oxidation and cross-linking is realized, the cross-linking activation energy of oxygen-containing functional groups is remarkably reduced, oxygen-containing active sites generated by asphalt oxidation are quickly and fully utilized, and the service life of the asphalt is prolonged. Therefore, the precursor with high oxygen content, stable cross-linked structure and good thermal stability is obtained. After the precursor is carbonized, the pitch-based hard carbon material with excellent electrochemical performance can be prepared, and the pitch-based hard carbon material is suitable for being used as a battery negative electrode material.

The invention discloses a doped modified ternary positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of batteries and ternary materials. The preparation method comprises the following steps: respectively weighing Ni0. 8Co0. 1Mn0. 1 (OH) 2, lithium hydroxide and a doping agent according to a molar ratio, mixing and grinding to form a mixture; and calcining the mixture in sections in an oxygen atmosphere, grinding and sieving to obtain the doped and modified ternary positive electrode material. The high-nickel ternary material is doped with a proper amount of Ti and V, and the Ti and V have a synergistic effect, so that the stability of the material structure is improved, the cation mixing degree is reduced, the reversible degree of the material and the reaction kinetics are improved, and the electrochemical performance of the material is improved.

The present invention relates to the technical field of waste catalyst treatment, and discloses a waste hydrogenation catalyst treatment method, a hydrogenation catalyst, and a heavy oil and / or residual oil hydrotreatment method, the method comprises: (1) in an oxygen-containing atmosphere, carrying out carbon burning treatment on the waste hydrogenation catalyst; (2) leaching part of metal in the catalyst obtained in the step (1) by adopting an acid solution to obtain a leaching solution and a leaching residual catalyst; wherein compared with the waste hydrogenation catalyst, the leaching rate of vanadium in the leaching residual catalyst in terms of oxide is 62-94%; (3) carrying out extraction treatment on the leaching solution to obtain an extraction solution containing V < 4 + > and a raffinate; and (4) dipping the leaching residual catalyst obtained in the step (2) by adopting the raffinate, and then carrying out high-temperature activation treatment at 600-800 DEG C. The hydrogenation catalyst obtained by the treatment method is applied to the hydrotreating process of heavy oil and / or residual oil, and has relatively good demetallization performance and relatively high desulfurization activity stability.

The invention discloses a preparation method of a catalyst for catalytic reduction of SO2 by CO in an oxygen-containing atmosphere, and belongs to the technical field of atmospheric pollution purification. According to the catalyst, base metals such as Fe and Cu are adopted to modify supported metal sulfide, active components of the supported metal sulfide comprise FeS, CoS2, CuS and the like, and common metal oxides such as cerium oxide, titanium oxide, aluminum oxide and the like are selected as carriers. The catalyst not only has strong SO2 catalytic reduction performance and high stability in an oxygen-containing atmosphere, but also is simple in preparation process, wide in raw material source and low in cost, has remarkable economical efficiency and environmental protection benefits, has a wide application prospect in the field of air pollution purification, and has important significance in reducing SO2 emission and improving air quality. The embodiment shows that when the oxygen volume content of the Fe elementary substance modified supported metal sulfide composite catalyst is 5%, the SO2 conversion rate is 97.9%, and the sulfur yield is 90.6%.

The invention discloses a vertical sintering method for improving EuBCO high-temperature superconducting target material component uniformity, and belongs to the field of superconducting target material preparation. The cylindrical EuBCO target blank is vertically fixed to the center of an alumina crucible, the axis of the cylindrical EuBCO target blank is made to be perpendicular to the bottom face of the crucible, and sintering is conducted in the oxygen atmosphere at the temperature of 900-950 DEG C. Traditional surface contact is replaced by point / line contact, the contact area is reduced by more than or equal to 80%, and the gas diffusion retardation effect of the contact surface is eliminated; meanwhile, oxygen permeation and CO2 diffusion are enhanced through the exposed side faces, and generation of impure phases such as BaCO3 and BaCuO2 is inhibited. The XRD contact ratio of the two end faces of the sintered target material is larger than 99%, and the problem of composition segregation caused by traditional horizontal sintering is solved. The method does not need a crucible coating or an isolating layer, and is low in cost and free of secondary pollution.

The invention relates to the technical field of hard carbon material manufacturing, in particular to a method for preparing a hard carbon negative electrode material from medium and low temperature coal tar based pitch, which comprises the following steps: (S1) uniformly mixing the medium and low temperature coal tar based pitch and a cross-linking modifier, and carrying out heat treatment to obtain cross-linked modified pitch; the cross-linking modifier is a compound of a copolymer and a compound A; (S2) mixing the cross-linked modified asphalt with sulfur-containing polyaldehyde, and oxidizing in an oxygen-containing atmosphere to obtain first oxidized asphalt; (S3) uniformly mixing the first oxidized asphalt and a modifier, and carrying out secondary oxidation crosslinking to obtain second oxidized asphalt; and (S4) uniformly mixing the second oxidized asphalt and a pore-forming agent, and carrying out heat treatment in an inert atmosphere to obtain the product hard carbon material. The hard carbon material prepared by the invention has excellent electrochemical performance, is suitable for a negative electrode material of a sodium-ion battery, and remarkably improves the first effect and cycling stability.

The invention discloses a method for preparing YAG transparent ceramic by two-step sintering, which comprises the following steps: 1) weighing yttrium oxide powder and aluminum oxide powder according to a stoichiometric ratio, mixing, and carrying out solid-phase reaction to synthesize YAG powder; 2) performing dry grinding and wet grinding on the obtained YAG powder to obtain mixed slurry; 3) drying the obtained mixed slurry to obtain powder, and performing compression molding and cold isostatic pressing to obtain a ceramic biscuit; and 4) pre-sintering the obtained ceramic biscuit in an oxygen-containing atmosphere, embedding the pre-sintered ceramic with oxide particles, and carrying out hot isostatic pressing sintering to prepare the YAG transparent ceramic. On the basis of obtaining the YAG transparent ceramic with high optical quality, a microstructure with a fine grain size can be obtained, and good mechanical properties are considered; the preparation method is simple, the equipment cost and energy consumption are low, the traditional annealing step can be omitted, and a new thought can be provided for preparation of the high-performance YAG transparent ceramic.

The invention belongs to the technical field of secondary battery materials, and particularly discloses a porous carbon material for an asphalt-based lithium ion battery silicon-carbon negative electrode and a preparation method thereof.The preparation method of porous carbon comprises the steps that S1, an asphalt material is heated in the air or oxygen atmosphere for pre-oxidation crosslinking, then pre-carbonization treatment is conducted in the protective atmosphere, and pre-carbonized asphalt is obtained; s2, dissolving alkali with deionized water, then adding the pre-carbonized asphalt and absolute ethyl alcohol, fully infiltrating, and then heating and drying to obtain an alkali-carbon mixture; and S3, activating the alkali-carbon mixture in a protective atmosphere to obtain the asphalt-based porous carbon for the silicon-carbon negative electrode of the lithium ion battery. The asphalt-based porous carbon for the silicon-carbon negative electrode of the lithium ion battery prepared by the method disclosed by the invention has extremely high specific surface area and particle strength, and the microporosity is adjustable.

The invention provides a method for removing phosphorus from a cobalt sulfate solution. The method comprises the following steps: providing a cobaltous sulfate solution to be treated; the method comprises the following steps: mixing a to-be-treated cobaltous sulfate solution, a composite polymer soluble ferric salt and a coagulant aid, carrying out precipitation reaction, and separating to obtain phosphorus-containing slag and cobaltous sulfate primary purified liquid; a deep phosphorus removal adsorbent is adopted to adsorb trace phosphorus in the cobalt sulfate primary purification liquid, then trace iron in the cobalt sulfate primary purification liquid generates precipitates in an oxygen-containing atmosphere, and after separation, a cobalt sulfate secondary purification liquid is obtained. According to the method, firstly, the synergistic effect of the composite polymer soluble ferric salt and the coagulant aid is adopted, and primary efficient removal of phosphorus is achieved; then, a deep phosphorus removal adsorbent is used for directionally adsorbing trace phosphorus in the cobalt sulfate primary purification liquid, so that deep removal of phosphorus is further realized; and finally, the residual trace iron is precipitated and separated in the oxygen-containing atmosphere, so that the purity of the secondary purified cobalt sulfate liquid is further guaranteed.

The invention belongs to the technical field of target materials, and discloses a multi-element doped indium germanium oxide ceramic target material and a preparation method thereof. The ceramic target material comprises indium oxide, germanium oxide and doped oxide, and the doped oxide is one or two of cerium oxide, hafnium oxide or titanium oxide; the preparation method comprises the following steps: mixing In2O3 powder, GeO2 and doped oxide powder, carrying out ball milling, drying, grinding and sieving on the mixed powder to obtain mixed oxide powder, sequentially carrying out compression molding and cold isostatic pressing on the mixed oxide powder to obtain a target material green body, putting the target material green body in an oxygen atmosphere, and carrying out sintering to obtain the target material. A multi-element doped indium germanium oxide ceramic target material is obtained by using a multi-stage sintering method; by adjusting the doping elements in the target material, the proportion of the doping elements and the staged sintering temperature and time, the density and the conductivity of the target material can be remarkably improved.

The invention provides a process method for producing ferrotitanium powder by reducing ilmenite, which comprises the following steps of: uniformly mixing ilmenite concentrate with a biomass-coal mixed reducing agent, a nanoscale additive and the like, reducing in a rotary kiln under a temperature-controlled and oxygen-controlled atmosphere, quenching and cooling a product by water, and performing multi-stage ore grinding magnetic separation to obtain metal iron particles and a titanium-rich material; and preparing the two into a ferrotitanium powder product. The process integrates innovative units of raw material homogenization pretreatment, biomass-coal mixed reducing agent dynamic proportioning, LIBS + Raman spectrum on-line monitoring closed-loop control, nano CaO-Na2O composite catalyst buffer addition, finished product multistage magnetic separation reforming and the like. The product composition fluctuation is obviously reduced, the TiO2 content fluctuation is controlled within + / -0.4%, the FeO content fluctuation is controlled within + / -0.5%, the metallization ratio is improved to 90% or above, the heat efficiency is improved by about 20%, and the energy consumption per unit yield is reduced by about 15%. The ilmenite is directly, efficiently and cleanly utilized, a high-quality titanium-rich raw material can be provided for production of titanium dioxide, titanium sponge and the like, meanwhile, the byproduct high-grade iron powder is used for steelmaking, and the comprehensive utilization benefit of resources is remarkable.

This invention discloses a method for preparing high rare-earth-doped low-loss boron-containing glass optical fibers. The steps are as follows: weigh glass raw materials containing rare-earth oxides and boron oxide, mix them uniformly, and place them in a high-temperature furnace. First, heat the mixture under a high-purity nitrogen atmosphere, then switch to a high-purity oxygen atmosphere or a high-purity air atmosphere for continued heating. The resulting glass melt is cooled and annealed to obtain a large glass block. The glass is then processed into a preform and placed in an optical fiber drawing furnace for fiber drawing under a high-purity oxygen atmosphere, thus achieving the preparation of high rare-earth-doped low-loss glass optical fibers. This invention eliminates the additional glass matrix absorption in the near-infrared region caused by boron in boron-containing glass optical fibers and also transforms the transition metal impurity ions from a low valence state with broad absorption in the near-infrared region to a high valence state with narrow low absorption in the near-infrared region. Both of these aspects significantly reduce the matrix absorption of boron-containing glass optical fibers, providing possibilities for the application of high rare-earth-doped low-loss glass optical fibers.

This invention belongs to the field of semiconductor optoelectronic device manufacturing technology and discloses a multi-stage annealing process for ITO thin films, including the following steps: Step 1: Under high vacuum protection, the furnace temperature is raised from room temperature to a first temperature T1 and held for a first time; Step 2: The furnace temperature is raised to a higher second temperature T2 and held for a second time, without the need for oxygen introduction during the second holding stage; Step 3: While maintaining the second temperature T2, a third holding stage is performed, and oxygen is introduced during the third holding stage; Step 4: A controllable cooling process is performed, which includes at least a slow cooling stage under the oxygen atmosphere and a rapid cooling stage under an inert gas or extremely low oxygen concentration atmosphere. This invention achieves precise staged control of the ITO thin film crystallization process, oxygen vacancy filling, and interfacial reactions by precisely controlling the oxygen partial pressure and cooling rate at different temperature stages.

The application discloses a treatment method for reducing carbon content of REBCO powder, and relates to the technical field of superconducting material preparation. The treatment method is that the REBCO powder is placed in an ozone-containing atmosphere for heat treatment. The core principle of the treatment method is that the strong oxidizing property of ozone and active oxygen atoms generated by the decomposition of ozone are used to directly oxidize carbon impurities in the REBCO powder into CO2 gas at a lower temperature, and meanwhile, the superconducting phase is avoided from being damaged. It is verified by a carbon analyzer that the carbon reduction efficiency of the powder after ozone heat treatment is several times higher than that of the powder after traditional oxygen atmosphere treatment.

The invention belongs to the field of sewage treatment, and particularly relates to a tencel production wastewater treatment process. Comprising the following steps: etching a carbon nanotube to obtain a porous carbon nanotube; carrying out amino functional modification on the porous carbon nanotube to obtain a modified carbon nanotube; loading cobaltosic oxide on the modified carbon nanotube, and then forming a nickel-cobalt composite oxide on the outer wall of the modified activated carbon by adopting nickel salt to obtain the catalyst, the method comprises the following steps: adding a catalyst into wastewater, heating a system to 70-90 DEG C, then stopping heating, and carrying out an illumination reaction in an oxygen-containing atmosphere; according to the process, through the synergistic effect of light, heat and oxygen, the reaction activity of active sites on the surface of the catalyst is enhanced, the reaction time is shortened, meanwhile, the interaction between amino and reactants is enhanced, and desorption and degradation of pollutants are accelerated.