50 results about "Manganese sulfide" patented technology

The invention discloses a method for synthesizing a Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst by adopting a solvothermal method, and belongs to the technical field of catalysts. The preparation method comprises the following steps: preparing copper molybdenum sulfide by using cuprous oxide as a template, synthesizing copper molybdenum sulfide with high purity and good crystallinity by combining a solvothermal method, preparing manganese cadmium sulfide by using manganese acetate, cadmium acetate, sodium hydroxide and thioacetamide as raw materials, adding copper molybdenum sulfide before a hydrothermal reaction, successfully modifying the manganese cadmium sulfide by constructing a heterojunction, and preparing the copper molybdenum sulfide modified manganese cadmium sulfide. The Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst is synthesized, and the photocatalytic hydrogen production rate of the cadmium manganese sulfide is improved. Moreover, the hydrogen production rate of the Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst prepared by the invention can reach 8233 mu mol / (g.h), which is 2.08 times of the hydrogen production rate of pure cadmium manganese sulfide, and 1.24 times of the hydrogen production rate of cadmium manganese sulfide loaded with 1% platinum.

The invention provides a photocatalyst based on sulfide homogeneous heterojunction and a preparation method and application thereof, and belongs to the technical field of photocatalysts. The photocatalyst based on the sulfide homogeneous heterojunction provided by the invention is a heterojunction formed by twin-crystal sulfur-cadmium-manganese and transition metal sulfide, has excellent structural stability, and can provide more photo-induced electrons. Therefore, when the photocatalyst provided by the invention is used for degrading H2S to produce hydrogen, the Schottky junction of the photocatalyst can reduce the hydrogen production overpotential, H2S is effectively decomposed to produce hydrogen, and meanwhile, a product Na2S2O3 with a high additional value is produced. The result of the embodiment shows that the photocatalyst based on the sulfide homogeneous heterojunction has excellent catalytic activity when being used for degrading H2S to produce hydrogen.

The application discloses an easy-to-cut steel with excellent plasticity and drilling performance and a preparation method thereof, and the preparation method comprises the following steps: converter smelting, LF refining, continuous casting, hot rolling and air cooling line cooling; in the continuous casting step, the water quantity of a crystallizer is 130-140 m 3 / h, and the secondary cooling water quantity is 0.8-1.0 L / kg; in the air cooling line cooling step, the cooling speed is 1-1.5 DEG C / s from the spinning temperature to greater than 650 DEG C, and the cooling speed is 2-4 DEG C / s in the range of 650 DEG C-500 DEG C; under the condition of not adding easy-to-cut elements and increasing production cost, the plasticity and drilling performance of the easy-to-cut steel are significantly improved by controlling the manganese sulfide inclusion size, hardness and structure of the rolled material.

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.

The application provides a method for comprehensive utilization of valuable metals in waste ternary lithium ion battery electrode powder, comprising the following steps: (1) mixing the waste ternary lithium ion battery electrode powder with concentrated sulfuric acid, and roasting under a mixed atmosphere of sulfur dioxide and air; (2) water immersion of the roasted material, and solid-liquid separation to obtain a lithium-containing cobalt-nickel-manganese sulfate solution and a graphite filter residue; (3) adding manganese sulfide to the lithium-containing cobalt-nickel-manganese sulfate solution to react, and solid-liquid separation to obtain a filtrate and a precipitate residue; (4) oxidizing and roasting the precipitate residue; (5) water immersion and acid immersion of the roasted product to obtain a nickel-cobalt sulfate solution, and impurity removal of the nickel-cobalt sulfate solution to obtain a battery-grade nickel-cobalt sulfate solution; and (6) sulfuration and manganese precipitation of the filtrate, solid-liquid separation after reaction, and obtaining of crude manganese sulfide and a lithium-rich solution. The method has low cost, high reduction rate of metals in the electrode powder, can realize recycling of sulfur, avoid pollution, and has high metal recovery rate.

The invention particularly discloses corrosion-resistant free-cutting steel based on manganese sulfide for promoting graphitization and a manufacturing method of the corrosion-resistant free-cutting steel. The corrosion-resistant free-cutting steel comprises the following chemical components in percentage by mass: 0.75%-1.35% of C, 1.85%-2.35% of Si, 0.10%-0.30% of Mn, 0.01%-0.04% of P, 0.010%-0.030% of S, 0.001%-0.003% of B, less than or equal to 0.002% of T [O], less than or equal to 0.005% of N, less than or equal to 0.008% of Al and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of converter smelting, LF refining, RH refining, continuous casting, hot rolling, constant-temperature salt bath treatment and tempering. Dispersion precipitation of the submicron MnS phase in the high-carbon high-silicon steel wire rod is achieved, precipitation and graphitization transformation of Fe3C in the tempering process are effectively promoted, and the corrosion resistance and the cutting performance of the high-carbon high-silicon steel wire rod tend to be excellent at the same time.

This invention discloses a method for preparing cobalt-manganese sulfide nanosheets@cobalt-copper sulfide nanowire arrays / nickel foam as a supercapacitor electrode material. The purpose of this invention is to design a core-shell structure composed of different components to improve the specific capacity and cycle performance of the electrode material. This invention mainly includes: 1. Hydrothermal preparation of cobalt-copper precursor / nickel foam (CoCu-pre / NF); 2. Hydrothermal sulfidation preparation of cobalt-copper sulfide nanosheet arrays / nickel foam (CuCo2S4 / NF); 3. Hydrothermal preparation of cobalt-manganese sulfide nanosheets@cobalt-copper sulfide nanowire arrays / nickel foam (MnCoS@CuCo2S4 / NF). This invention features a simple synthesis process, low cost, high yield, and no need for subsequent processing. The MnCoS@CuCo2S4 heterostructure exhibits stronger OH... ‑ The MnCoS@CuCo2S4 / NF electrode exhibits high capture capacity and excellent conductivity, thereby enhancing the efficiency of rapid redox processes. At 1 A g... ‑1 At that time, it obtained 1141.2 C g. ‑1 The specific capacitance at 10 A g ‑1 It exhibits excellent cycling performance of 90.7% over 10,000 cycles. (740.47 W kg) ‑1 At a power density of 64.38 Wh / kg, the hybrid supercapacitor (HSC) can provide 64.38 Wh / kg. ‑1 The electrode exhibits high energy density and can successfully light up LED bulbs. It has enormous application potential as a high-performance electrode material for supercapacitors.

The invention relates to double transition metal doped manganese sulfide-cyclodextrin (MnM1M2S3-CD) as well as a preparation method and an application of the double transition metal doped manganese sulfide-cyclodextrin (MnM1M2S3-CD). The preparation method comprises the following steps: suspending cyclodextrin in an ethanol solution containing Mn < 2 + >, transition metal M < 12 + > and transition metal M < 2 + >, and stirring and reacting for 2.0-24.0 hours at 0-60 DEG C in an N2 atmosphere; after stirring is completed, a reaction mixture is subjected to suction filtration and ethyl alcohol washing, and cyclodextrin solids adsorbing Mn < 2 + >, transition metal M < 12 + > and transition metal M < 2 + > are obtained. The method comprises the following steps: putting a cyclodextrin solid adsorbed with metal ions, thiourea and hexadecyl trimethyl ammonium bromide into a hydrothermal kettle, and carrying out hydrothermal reaction at 100-200 DEG C for 8.0-48.0 hours; and washing the obtained solid with ethanol and deionized water, and carrying out vacuum drying at 80 DEG C to obtain the double transition metal doped manganese sulfide-cyclodextrin (MnM1M2S3-CD). The invention discloses a method for preparing ethanol by reducing CO2 under driving of visible light. The method is carried out at room temperature, uses visible light as an energy source and water as a solvent and a hydrogen source, and has the characteristics of environmental protection, energy conservation and emission reduction.

The present invention discloses a method for processing waste lithium-ion battery powder, comprising ball-milling the waste lithium-ion battery powder to 20 to 500 meshes, and sequentially subjecting the waste lithium-ion battery powder to acid dissolution, filtration, copper recovery, oxidation, and sulfide precipitation; on the one hand, subjecting the nickel-cobalt-manganese sulfide filter residue to static oxidation, chemical oxidation, and precursor preparation; on the other hand, oxidizing a lithium iron-aluminum solution with hydrogen peroxide under acidic conditions and then adding sodium carbonate, thereby achieving the preparation of lithium carbonate; and evaporating, crystallizing, and drying the wastewater and washing water in the reaction process to obtain anhydrous sodium sulfate, and obtaining sodium sulfide by fully reacting anhydrous sodium sulfate with carbon at high temperature. The present invention aims to achieve the recovery of copper, iron, and aluminum through the coordinated design of multiple redox reactions, as well as the preparation of lithium carbonate and ternary battery material precursors, and also achieve the recycling of sodium sulfide, thereby improving the effective utilization rate of waste batteries.

The invention relates to manganese sulfide-cyclodextrin doped artificial synthetase as well as a preparation method and application thereof, and the stoichiometric general formula of the formula of the synthetase is MnMS2-CD, wherein M is selected from Pt, Pd or Ir, and CD is selected from one or a composition of more of alpha-cyclodextrin, beta-cyclodextrin and gamma-cyclodextrin; the preparation method comprises the following steps: S1, suspending CD in an ethanol solution containing Mn < 2 + > and M < 2 + >, carrying out a stirring reaction in an inert gas atmosphere, and after the reaction is finished, carrying out post-treatment to obtain a cyclodextrin component adsorbed with Mn < 2 + > and M < 2 + >; and S2, carrying out a hydrothermal reaction on the cyclodextrin component and thiourea in the presence of hexadecyl trimethyl ammonium bromide, and after the reaction is finished, carrying out post-treatment to obtain the double transition metal doped manganese sulfide-cyclodextrin biomimetic catalyst, the synthetase is applied to preparation of ethanol through photocatalytic reduction of carbon dioxide. The method has the effects of efficiently catalyzing CO2 reduction and directionally generating ethanol.

The invention provides a control method for manganese sulfide inclusions in the smelting process of low-alloy ultrahigh-strength steel. The control method comprises the following steps that the critical condition of MnS precipitation is calculated through a thermodynamic equation; calculating the quantitative relation between the MnS particle growth radius and the influence factors through a kinetic equation; in the electric furnace smelting stage, the content of residual elements in molten steel is regulated and controlled according to the critical condition of MnS precipitation; and in the vacuum consumable smelting stage, proper remelting parameters are designed according to the quantitative relation between the growth radius of MnS particles and influence factors, the solidification process of molten steel is accurately controlled, and growth of MnS inclusions is inhibited. According to the method, the precipitation thermodynamics of the electric furnace stage and the solidification dynamics of the vacuum self-consumption stage are subjected to combined modeling for the first time, the bottleneck of process splitting in a traditional process is broken through, primary precipitation and large secondary growth of MnS inclusions are accurately inhibited while high cost of deep desulfurization is avoided, and the average size of MnS is remarkably reduced and dispersed distribution is achieved.

The present application discloses a method and a statistical device for counting the number of inclusions, which are applied to counting manganese sulfide inclusions in free-cutting steel. The statistical method comprises: obtaining a first true number, a first area ratio, a first average area, a first average perimeter, a first average sphericity, and a first apparent number of manganese sulfide inclusions in multiple two-dimensional cross-sectional images of a training sample; constructing a statistical model based on the first true number, the first area ratio, the first average area, the first average perimeter, the first average sphericity, and the first apparent number; obtaining a second area ratio, a second average area, a second average perimeter, a second average sphericity, and a second apparent number of manganese sulfide inclusions in a metallographic image of a sample to be counted, and substituting these into the statistical model to obtain the number of manganese sulfide inclusions in the sample to be counted as output by the statistical model.

This invention discloses a method for preparing a carbon-coated manganese oxide / manganese sulfide composite cathode material. First, manganese dioxide nanotubes are prepared using a hydrothermal method. Then, the manganese dioxide nanotubes are completely or partially sulfided to obtain manganese oxide / manganese sulfide. Next, a conductive polymer is coated onto the surface of the manganese oxide / manganese sulfide nanoparticles. Finally, the resulting manganese oxide / manganese sulfide nanoparticles with the conductive polymer coating are placed in a tube furnace and treated at high temperature for a certain period of time to obtain the carbon-coated manganese oxide / manganese sulfide composite cathode material. This carbon-coated manganese oxide / manganese sulfide nanocomposite material, as a cathode material for zinc-ion batteries, avoids direct contact between the electrolyte and the active material due to the carbon coating, preventing material dissolution and improving cycle life. The heterogeneous structure of manganese oxide / manganese sulfide enhances the electrochemical activity of the material, solving the problem of poor conductivity in traditional manganese oxide materials.

This application discloses a sulfur-lead composite steel rod and its preparation method, as well as a steel pipe and soluble structural components, solving the technical problem that soluble bridge plugs in the prior art do not meet the high-pressure maintenance requirements of deep wells. The steel rod comprises the following chemical composition in parts by mass: Fe: 90-97.5 parts, C≤0.6 parts; S: 0.1-0.6 parts, Mn: 0.50-3.00 parts, Pb: 0.2-0.3 parts, O: 0.0010-0.0200 parts; the steel rod has composite inclusions; the composite inclusions include an inner core and a continuous or discontinuous outer shell distributed around the inner core, the inner core including manganese sulfide particles, and the outer shell including first lead particles; the steel rod includes a first region, a second region, and a third region arranged sequentially from the inside out; the average equivalent diameter of the composite inclusions in the first region is larger than that in the second region; the number of composite inclusions per square millimeter in any cross-section of the third region is greater than that in the second region. The sulfur-lead composite steel rod provided by this application has high strength and meets the high-pressure maintenance requirements of deep wells.

The application discloses a sulfur-selenium matched free-cutting steel bar and a manufacturing method thereof. The free-cuting steel bar comprises the following components: C: 0.35-0.50%, Si: 0.18-0.38%, Mn: 1.37-1.50%, P: less than 0.03%, S: 0.1-0.24%, Se: 0.02-0.20%, Cr: 0.16-0.23%, Mo: 0.15-0.20%, and the balance of Fe and inevitable impurities; wherein, the O content is in the range of 0.0065-0.0100%, and the selenium-sulfur ratio is controlled in the range of 0.08-2.00. By adjusting the element ratio of manganese, sulfur and selenium, and matching a certain content of oxygen, beneficial inclusions are precipitated in the steel smelting and solidification process and are dispersedly distributed in the steel, the inclusions prevent the sulfide manganese soft core structure from being elongated and deformed in the rolling process, the morphology of the inclusions is changed to a shape beneficial to cutting, and the cutting performance is improved.

The application discloses a sulfur-bismuth combined high-cutting-property bar and a production method thereof. The chemical components of the sulfur-bismuth combined high-cutting-property bar are as follows: C: 0.07-0.12%, Si: 0.06-0.1%, Mn: 0.9-1.03%, P: 0.01-0.1%, S: 0.15-0.3%, Bi: 0.04-0.17%, O: 0.0055-0.0075%, Bi / S: 0.14-1.13, Mn / S: 3-6.86, and the balance is iron and inevitable impurities, and the content is in percentage by weight. The sulfur-bismuth combined high-cutting-property bar is beneficial to the precipitation of inclusions and the dispersion distribution of the inclusions in the steel in the steelmaking and solidification process by optimizing the ratio of manganese, sulfur and bismuth and matching a certain content of oxygen, the inclusions prevent the elongation deformation of the manganese sulfide soft core structure in the rolling process, the morphology of the inclusions is changed into spindle-like or spherical shape which is beneficial to cutting, and the cutting performance is improved.

The application discloses a metal piece, a preparation method thereof and an electrical appliance. The metal piece comprises the following raw materials: an iron-based powder, a pre-alloyed steel powder, a copper powder, a graphite powder, manganese sulfide and zinc stearate. The pre-alloyed steel powder comprises the manganese sulfide, and the mass fraction of the manganese sulfide in the pre-alloyed steel powder is 0.2%-0.4% based on the mass of the pre-alloyed steel powder. Therefore, the metal piece has low carbon content, high tensile strength and high wear resistance, and simultaneously has excellent cutting performance, thereby meeting the efficient machining cycle and precision requirements of finish machining.

The invention discloses a manganese sulfide-based sodium storage electrode material, a preparation method and application, belongs to the technical field of sodium ion battery electrode materials, and solves the technical problems of volume expansion, cycle instability and poor specific capacity and rate capability of SIBs in the charging and discharging process in the prior art. The manganese sulfide and molybdenum sulfide hollow composite material rich in Mn-S-Mo bonds is obtained through electrostatic spinning and subsequent calcining treatment, the problem of volume expansion in the charging and discharging process is relieved by constructing a hollow structure, and the cycling stability is improved; due to the introduction of molybdenum sulfide MoS2, the specific capacity and rate capability of the sodium-ion battery are also improved while the conductivity of MnS is improved. The chemical formula of the manganese sulfide-based sodium storage electrode material prepared by the method is MnS (at) MoS2, and the manganese sulfide-based sodium storage electrode material is a composite material with a hollow structure; the preparation raw materials comprise 1.35 g of manganese acetylacetonate and 0.42 g of molybdenum acetylacetonate.

The application discloses a forging method for improving the manganese sulfide form in free-cutting steel, and comprises the following steps: uniformly heat treating and forging a free-cutting steel ingot to improve the manganese sulfide form in the free-cutting steel. The prepared free-cutting steel rod has good cutting performance, is suitable for manufacturing parts of automobile, high-speed rail, household appliances and office equipment industries to reduce machining cost, improve production efficiency and product competitiveness, and has a good application prospect.

The application discloses a process method for producing carbonyl iron powder from nickel-iron particles in the technical field of metal powder metallurgy, and the method comprises the following steps: grinding and screening nickel-iron particles and then performing vacuum drying pretreatment; dispersing the pretreated nickel-iron particles in anhydrous ethanol, adding an organic-inorganic hybrid manganese sulfide ammonium molybdate composite activator to perform surface modification, and obtaining modified nickel-iron particles; loading the modified nickel-iron particles into a reaction kettle, introducing carbon monoxide gas, performing a carbonylation reaction by heating, stopping heating, waiting for the reaction kettle to cool down, introducing nitrogen gas for purging, and introducing mixed gas phase into a two-stage condenser system; the mixed gas phase is sequentially cooled by a first-stage cooling to obtain a liquid of iron pentacarbonyl, and then the liquid of iron pentacarbonyl is cooled by a second-stage cooling to obtain a liquid of nickel tetracarbonyl; the liquid of iron pentacarbonyl is gasified after being subjected to vacuum rectification, and then is injected into a thermal decomposition tower for decomposition, so that carbonyl iron powder is obtained. The process is simple, raw materials are easy to obtain, the carbonylation reaction efficiency can be effectively improved, and the product has high purity.

The application belongs to the technical field of solid waste resource utilization in hydrometallurgy industry, and particularly relates to a method for preparing battery-grade manganese sulfate solution by synergistically treating manganese-iron alloy slag and manganese oxide slag, comprising the following steps: S1, obtaining manganese-iron alloy slag and manganese oxide slag as raw materials; S2, mixing and pre-adjusting the manganese-iron alloy slag, the manganese oxide slag, water and sulfuric acid to obtain a second slurry by acid leaching; S3, adding manganese powder into the second slurry to perform a first reaction, and filtering to obtain a first filtrate; S4, adding manganese sulfide slurry into the first filtrate to perform a second reaction, filtering to obtain a second filtrate, and obtaining a third filtrate after the second filtrate is refined and de-magnetized; S5, performing first high-temperature crystallization on the third filtrate to obtain first crystals, dissolving the first crystals in water, performing second high-temperature crystallization to obtain second crystals, dissolving the second crystals in water, and de-magnetizing to obtain battery-grade manganese sulfate solution. The application adopts a synergistic acid leaching process, consumes manganese-iron alloy slag and manganese oxide slag, and produces battery-grade manganese sulfate solution.

The invention provides free-cutting corrosion-resistant stainless steel and a preparation method thereof, and the free-cutting corrosion-resistant stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.12% of C, less than or equal to 1.0% of Si, 0.5%-2.0% of Mn, 13%-18% of Cr, less than or equal to 0.040% of P, less than or equal to 0.040% of S, less than or equal to The alloy comprises the following components in percentage by weight: 0.10%-0.40% of S, 1.5%-5.0% of Ni, 0.5%-3.0% of Mo, 0.001%-0.5% of Nb, 0.001%-0.5% of Ti, 0.0001%-0.02% of B, 0.1%-2.5% of Cu, 0.02%-0.08% of N and the balance of iron and inevitable impurities. The ferrite phase accounts for 10-50%, and the balance is the tempered sorbite phase; manganese sulfide in the free-cutting corrosion-resistant stainless steel is spherically separated out, and the problems that in the prior art, stainless steel is poor in transverse performance, corrosion resistance and cutting performance are solved.

This invention discloses a gear steel for automotive transmissions and its manufacturing method, comprising: C: 0.19%~0.21%, Si: 0.23%~0.28%, Mn: 0.95%~0.98%, Cr: 1.08%~1.12%, Ti: 0.05%~0.07%, S: 0.028%~0.035%, P≤0.015%, Als: 0.008%~0.025%, Ni≤0.05%, Cu≤0.05%, Mo≤0.01%, residual elements Sn≤0.01%, Pb≤0.005%, As≤0.02%, Bi≤0.008%, Sb≤0.008%, total oxygen content: 0.001%~0.002%, total nitrogen content ≤0.004%, with the balance being Fe and unavoidable impurity elements, and the Mn / S ratio ranging from 27 to 35. This application controls the carbon-oxygen product at the end of the converter smelting process, which helps reduce residual oxygen in the steel; the aluminum-containing modifier modifies the ladle top slag, which helps improve aluminum yield; the high-basicity slag operation in the early stage of refining effectively removes and controls oxygen in the molten steel, while the lower-basicity slag operation in the later stage of refining stabilizes the sulfur content and yield in the subsequent sulfur feeding line; the sulfides are mainly composed of single manganese sulfide sulfides, with a core of calcium aluminate and an outer layer of manganese sulfide composite sulfides, and are in a diffuse distribution state, which effectively ensures the machinability of gear steel.

The invention discloses a microalloyed iron-nickel-based precision alloy strip production process, and relates to the technical field of iron-nickel-based alloy preparation, and the process mainly comprises the steps of batching, vacuum induction melting, electroslag remelting, forging, hot rolling, cold rolling and heat treatment. On the basis of a traditional 4J42 alloy, a trace amount of ferrous sulfide is added, rare earth is added to serve as a nucleation center of manganese sulfide, MnS is controlled to be in a spherical shape, deformation is not likely to happen in the rolling process, transverse plasticity and toughness losses are reduced, and the material performance is more uniform; surface oxidation and defect inheritance in the heating process are inhibited through measures of coating the surface of the forging stock with an antioxidant, enhancing milling surface treatment and the like, the thermal expansion coefficient of spherical MnS is closer to that of a matrix, pitting sources are reduced, and corrosion resistance is improved; the rare earth is converted into high-melting-point rare earth oxysulfide, so that the corrosion resistance is enhanced; by controlling sulfur, the proportion of a shearing surface and a fracture surface of the strip in stamping and punching is increased, and the problems of peeling and cracking in the stamping and forming process are solved.

This application relates to a sulfur-containing soluble steel bar and its preparation method, as well as a steel pipe and soluble structural components, belonging to the field of petroleum extraction engineering technology. The soluble steel bar comprises the following chemical composition by mass fraction: S: 0.01%~0.60%, C: 0.20%~0.60%, O: 0.0010%~0.0200%, Mn: 0.50%~3.00%, Si: 0.06%~0.70%, P≤0.03%, with the remainder being Fe and unavoidable impurities. The microstructure of the soluble steel bar includes pearlite, ferrite bands, and manganese sulfide particles. The pearlite and ferrite bands extend along the axial direction of the soluble steel bar. Along the axial direction perpendicular to the steel bar, the pearlite and ferrite bands are alternately distributed. Along the circumferential direction of the soluble steel bar, the pearlite and ferrite bands are alternately distributed. In the microstructure composed of the pearlite and ferrite bands, the volume fraction of the ferrite bands is 40%~70%. The sulfur-containing soluble steel rod provided in this application has high strength under high temperature conditions in deep wells and a fast dissolution rate under hydrochloric acid conditions.

The invention relates to a preparation method and application of a gamma-manganese dioxide positive electrode material, and the preparation method comprises the following steps: dissolving potassium persulfate, manganese disulfide and potassium permanganate in deionized water, transferring into a hydrothermal kettle after the potassium persulfate, the manganese disulfide and the potassium permanganate are completely dissolved, putting into a drying oven, and carrying out hydrothermal synthesis at a certain temperature for a certain time to obtain gamma-manganese dioxide. And after the reaction is completed, taking out the hydrothermal kettle after cooling, washing and filtering the product for multiple times, and drying in a drying oven to obtain the finished product gamma-manganese dioxide. Manganese dioxide prepared by the method has a nano single-crystal structure and is different from a traditional material, and a sample does not contain K < + >. The problems of low specific capacity and poor cycling stability caused by low ionic conductivity and poor intercalation and deintercalation reversibility of gamma-manganese dioxide are solved.

The application relates to a manganese sulfide-based sodium storage electrode material, a preparation method and application, and belongs to the technical field of sodium ion battery electrode materials. The application solves the technical problems of volume expansion in the charging and discharging process, cycle instability, and poor specific capacity and rate performance of SIBs in the prior art. The application obtains a manganese sulfide and molybdenum sulfide hollow composite material rich in Mn-S-Mo bonds through electrostatic spinning and subsequent calcination, the volume expansion problem in the charging and discharging process is relieved through the construction of a hollow structure, and the cycle stability is improved; the introduction of molybdenum sulfide MoS2 improves the conductivity of MnS and also improves the specific capacity and rate performance of the sodium ion battery. The manganese sulfide-based sodium storage electrode material prepared by the method has a chemical formula of MnS@MoS2 and is a hollow structure composite material; the preparation raw materials include 1.35 g of acetylacetone manganese and 0.42 g of acetylacetone molybdenum.

This invention belongs to the field of iron and steel metallurgical technology and discloses a modification treatment process for manganese sulfide inclusions in heavy rail steel. The method of this invention includes the following steps: 1) Converter smelting: During the tapping process, low-alumina silicon barium calcium deoxidizing alloy and active lime are added to the molten steel to reduce the total oxygen content in the steel to ≤30ppm; 2) LF refining: Refining agent is added to the slag surface to control the slag basicity to 2.0~2.8, and the FeO+MnO in the slag to ≤0.8%, so that the total oxygen content in the steel is ≤10ppm and the sulfur content in the steel is ≤0.006%; 3) RH vacuum treatment: The vacuum degree during the vacuum treatment process is ≤30Pa, and the total vacuum treatment time is 20~28min; after vacuum treatment for 15~25min, calcium treatment is performed to control the Ca / S atomic ratio to 1.2~2.0, and vacuum circulation is maintained for 3~5min after treatment; then the vacuum is broken, and soft argon blowing is performed after breaking the vacuum, and then the steel is discharged from the station with a total oxygen content of ≤8ppm and a sulfur content of ≤0.005%. This method modifies sulfides to generate high-melting-point, low-plasticity CaS and (Ca,Mn)S, which are not elongated during hot rolling and remain spherical or spindle-shaped, thus achieving control over the size of inclusions.

The present invention belongs to the technical field of steelmaking, and specifically relates to a method for recycling solid waste from molten iron pretreatment, specifically a method for applying KR desulfurization slag produced by KR molten iron pretreatment to the smelting of sulfur-containing free-cutting steel. The present invention adds KR desulfurization slag during LF refining after deoxidation and alloying in normal converter smelting, fully utilizing the combined use of KR desulfurization slag, converter deoxidation products, and converter final slag, successfully recovering sulfur from KR desulfurization slag, realizing waste slag recycling, reducing the consumption of ferrosulfur in steelmaking, reducing smelting costs, reducing the pollution and harm of waste slag to the environment, and at the same time increasing the spindle rate of manganese sulfide. The method provided by the present invention does not require changing the smelting process flow of sulfur-containing free-cutting steel, is more convenient for handling desulfurization slag, and is easy to promote throughout the industry.

The invention discloses transition metal doped manganese sulfide-cyclodextrin mimic enzyme as well as a preparation method and application thereof. The method comprises the following steps: suspending cyclodextrin in an ethanol solution containing Mn < 2 + > and M < 2 + >, and carrying out a stirring reaction in an N2 atmosphere to obtain a cyclodextrin solid adsorbed with Mn < 2 + > and M < 2 + >; mixing the solid with thiourea, hexadecyl trimethyl ammonium bromide and absolute ethyl alcohol, stirring at room temperature in an N2 atmosphere, and performing hydrothermal reaction to obtain transition metal doped manganese sulfide-cyclodextrin mimic enzyme (MnMS2-CD); mnMS2-CD can be used for preparing ethylene by reducing CO2 driven by visible light, the reaction is carried out at room temperature, visible light is used as an energy source, water is used as a solvent and a hydrogen source, and the method has the characteristics of environmental protection, energy conservation and emission reduction; meanwhile, the reduction product generation efficiency is high, the ethylene selectivity is good, the practicability is high, and the method is a green and efficient CO2 resource utilization way with a practical application prospect.