77 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 discloses a modified sodium ferrous sulfate positive electrode material as well as a preparation method and application thereof, and relates to the technical field of sodium ion batteries. The modified sodium ferrous sulfate positive electrode material comprises a sodium ferrous sulfate matrix, and a carbon nanotube / iron-based MOF composite material and nickel manganese sulfide which are loaded on the sodium ferrous sulfate matrix. The structural stability and the electronic conductivity of the material can be remarkably improved by limiting the materials of the matrix and the load body, and the specific capacity and the cycle performance of the battery can be effectively improved by applying the positive electrode material to the sodium ion battery.

The invention relates to a manganese cadmium sulfur and manganese sulfide heterojunction composite photocatalytic material, which is composed of Mn < 0.7 > Cd < 0.3 > S and MnS. The invention also discloses a preparation method of the manganese-cadmium-sulfur-coated manganese sulfide heterojunction composite photocatalytic material. The preparation method specifically comprises the following steps: preparing the manganese-cadmium-sulfur-coated manganese sulfide heterojunction photocatalytic material through a one-step hydrothermal method; (CH3COO) 2Mn. 4H2O and (CH3COO) 2Cd. 2H2O are added, and the mixture is stirred and dissolved in water; adding the mixture into TAA and stirring for 30 minutes to obtain a fully mixed solution; and carrying out a hydrothermal reaction to obtain the final manganese-cadmium-sulfur-coated manganese sulfide heterojunction photocatalytic material. According to the invention, the photoresponse range is widened through the construction of the heterojunction, the transfer and separation efficiency of photo-induced electron holes is obviously improved, the compounding of photo-induced electron hole pairs is inhibited, and the efficiency of photocatalytic uranium reduction is improved.

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 invention belongs to the technical field of new energy materials, and discloses a sodium manganese sulfate sulfuration impurity removal method, which is divided into two stages of sulfuration, the first stage is that sodium sulfide reacts with manganese sulfate, the pH value is controlled to be 5-6, the second stage is that a small amount of sodium sulfide is added for continuous sulfuration, the pH value is controlled to be stabilized at 6.4-7.0, and the content of calcium, magnesium and other impurities in manganese sulfate is reduced as much as possible through secondary sulfuration. And the generated manganese sulfide is treated in the later stage to obtain manganese sulfate with low content of impurities such as calcium and magnesium. The quality of the refined manganese sulfate solution is improved by using a simple process, the impurity content is reduced, and the quality stability of the manganese sulfate product is improved, so that the market competitiveness of the high-purity manganese sulfate product is improved.

The invention relates to the technical field of environmental pollutant degradation and discloses a high-entropy alloy sulfide as well as a preparation method and application thereof. The metal elements in the high-entropy alloy sulfide are any five of molybdenum, iron, manganese, nickel, zinc and cobalt; according to the method, molybdenum disulfide, ferrous sulfide, manganese sulfide, trinickel disulfide, zinc sulfide and cobalt sulfide are used as raw materials, and the high-entropy alloy sulfide is prepared in one step through ball milling under the protection of argon atmosphere. The high-entropy alloy sulfide is mainly used for activating peroxymonosulfate to degrade organic pollutants in an aqueous solution. Experimental comparison shows that compared with a monometal sulfide, the high-entropy alloy sulfide prepared by the preparation method disclosed by the invention shows more efficient degradation capability on organic pollutants in an aqueous solution when cooperating with peroxymonosulfate. The preparation method disclosed by the invention is simple to operate, mild in reaction condition and capable of realizing large-scale production.

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.

The invention discloses a production method for improving the manganese sulfide form of a medium-carbon high-sulfur free-cutting steel wire rod and the medium-carbon high-sulfur free-cutting steel wire rod, and the production method comprises the following steps: adding a silicon-manganese alloy and a high-manganese alloy into molten steel for deoxidation alloying in the tapping process of a converter or an electric furnace, and adding lime, ferro-aluminum is not used in the tapping process, and the oxygen content of molten steel in an argon station behind the furnace is 20-40 PPm; lime, calcium carbide and ferrosilicon powder are adopted for slagging in the refining process, and aluminum-containing materials are strictly prohibited from being adopted; the refining outbound oxygen content is controlled to be 10-25 PPm; a weak cooling and slow drawing process is adopted for continuous casting, and the degree of superheat of molten steel is controlled to be 25-35 DEG C in the continuous casting process; during hot rolling, rolling is carried out by adopting 60-70% of large rolling reduction from initial rolling to 1080 DEG C; according to the method, the manganese sulfide form and distribution state of the medium-carbon high-sulfur free-cutting steel can be improved, the cutting performance of the medium-carbon high-sulfur free-cutting steel wire rod is improved, and the machining cracking rate is reduced.

The invention discloses an indium manganese sulfide-covalent organic framework MIS / BT50 composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. According to the preparation method, a solvothermal method synthesis strategy is adopted, indium manganese sulfide is introduced into a covalent organic framework, and the indium manganese sulfide-covalent organic framework MIS / BT50 composite photocatalyst is constructed; the composite photocatalyst has excellent visible light response capability, hydrogen peroxide can be efficiently prepared under visible light, and the yield of hydrogen peroxide in a pure water system reaches up to 3519 [mu] mol.g <-1 >. H <-1 >; meanwhile, under the condition that no extra iron source is added, the composite photocatalyst can rapidly inactivate escherichia coli in a water body, and the limitation that a traditional Fenton reaction depends on the iron source is broken through; the invention discloses a preparation method of the composite photocatalyst, and a solvothermal method is simple and controllable in preparation process, mild in reaction condition, high in raw material utilization rate and suitable for large-scale production.

The invention discloses a method for producing a silicon-manganese alloy by using electrolytic manganese sulfide slag. The method comprises the following steps: mixing the sulfide slag with coke or fine coal in proportion, calcining at high temperature, gradually heating in the process to remove crystal water, and carrying out decomposition, oxidation and reduction reactions. Sulfur dioxide gas generated in the calcining process is collected and converted into industrial sulfuric acid. And the calcined manganese-rich slag is used for producing the silicon-manganese alloy. The method has the beneficial effects that the valuable elements in the vulcanized slag are efficiently recycled, the environmental pollution is reduced, the economic benefit is improved, the sustainable development is promoted, the treatment efficiency is improved, the aims of comprehensive utilization and environmental protection of the vulcanized slag are achieved, and an effective solution is provided for industrial production.

The invention relates to the technical field of rare earth treatment, and in particular to a method for controlling the amount of rare earth added to a rare earth low alloy high-strength and tough steel. The invention obtains an optical image of a composite rare earth inclusion formed by interaction between aluminum oxide and manganese sulfide after adding a rare earth solution through testing. The optical image of the composite rare earth inclusion can accurately determine whether the anti-corrosion performance of the high-strength and tough steel meets the standard, thereby improving the accuracy of the amount of rare earth added to the high-strength and tough steel. The image of the segregated interface of rare earth ions, lanthanum ions and cerium ions can determine whether the wear resistance of the high-strength and tough steel meets the standard, further improving the accuracy of the amount of rare earth added to the high-strength and tough steel. According to the determined amount of rare earth added, an actual rare earth ion penetration quenching and tempering treatment operation is performed on the alloy steel, thereby further improving the accuracy of the amount of rare earth added to the high-strength and tough steel.

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.

The invention discloses an alloy with high yttrium content and a preparation method thereof, and relates to the field of alloys, and the alloy comprises the following raw materials by weight: 80-120 parts of yttrium oxide; 1-3 parts of chromium oxide; 10 to 20 parts of modified aluminum oxide; 1-5 parts of nickel oxide; 1-2 parts of graphite powder; 1-2 parts of zinc stearate; 0.5 to 1.5 parts of manganese sulfide; the modified aluminum oxide is prepared from the following raw materials: titanium dioxide, aluminum oxide, dilute sulphuric acid, sodium metaaluminate, maleic anhydride grafted polypropylene and a silane coupling agent. The method has the effect of improving the tensile strength of the alloy.

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.

To provide a method for producing high purity manganese capable of sufficiently reducing an oxygen concentration and a boron concentration.SOLUTION: There is provided a method for producing high purity manganese which comprises: a step of preparing a raw material manganese; a step of subjecting the raw material to a heat treatment of maintaining the raw material manganese in a temperature range of 40°C or more and 200°C or less for 1 hour or more and 48 hours or less in an atmosphere in which the partial pressure of oxygen is adjusted to 1.5×104 Pa or more and 8×104 Pa or less to oxidize the surface of the raw material manganese; and a step of heating the raw material manganese whose surface is oxidized to generate manganese vapor, followed by cooling the manganese vapor to obtain high purity manganese.SELECTED DRAWING: Figure 1

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 invention discloses a method for removing trivalent and pentavalent arsenic in sewage by generating iron and manganese sulfide in situ, which belongs to a sewage treatment technology, and is characterized by comprising the following operation steps: (1) adding soluble divalent manganese salt, soluble ferrous salt, sulfur ions and phosphate into a reactor containing sewage to be treated containing trivalent arsenic and pentavalent arsenic, and uniformly mixing; (2) stirring the reaction system to promote the production of the nano-state iron-manganese-sulfur composite colloid material and promote the generated nano-state iron-manganese-sulfur composite colloid material to form precipitates with trivalent arsenic and pentavalent arsenic ions; (3) carrying out solid-liquid separation on the precipitate, wherein supernate is sewage without arsenic element; the technology is simple in technological process, low in cost, good in arsenic removal effect and obvious in advantages in practical application, and has wide application prospects.

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 invention discloses a low-carbon, high-sulfur, bismuth-containing free-cutting steel and a manufacturing method thereof. The free-cutting steel is prepared by a certain ratio of manganese, sulfur and bismuth and a certain content of oxygen. Beneficial inclusions are precipitated during solidification and dispersed in the steel. The inclusions mainly include a manganese sulfide soft core structure, a manganese sulfide oxygen composite inclusion hard core structure, and a manganese sulfide bismuth composite inclusion hard core structure. The inclusions are dispersed in the steel, and during the rolling process, the manganese sulfide soft core structure is prevented from being elongated and deformed, so that the morphology of the inclusions changes to a spindle shape or a spherical shape that is beneficial to cutting, thereby achieving the purpose of improving the cutting performance and surface quality of the material.

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 invention provides a recovery method and application of metal in a nickel cobalt lithium manganate positive plate. The recycling method comprises the following steps: crushing a nickel cobalt lithium manganate positive plate disassembled from a waste battery, and screening to obtain positive powder; the positive electrode powder and ammonium persulfate are mixed and then calcined at the temperature of 500 DEG C or below, a solid product obtained after calcination is dissolved in water to obtain leachate, and ammonia gas generated after calcination is collected; an ammonia water solution with the concentration of 25-35 wt.% is added into the leachate to be mixed, the pH value is controlled to be 3.5-4.5 through sulfuric acid for a certain time, a first mixed solution is obtained, the first mixed solution is crystallized at the low temperature, then solid-liquid separation is conducted, and double salt crystals containing nickel and cobalt and a second mixed solution containing lithium and manganese are obtained; and adding ammonium sulfide into the second mixed solution containing lithium and manganese to obtain manganese sulfide precipitate and a lithium-containing solution, and evaporating the lithium-containing solution to obtain lithium sulfate and ammonia gas. According to the recovery method, the reaction product is recycled, the problem of waste liquid treatment does not exist, the leachate can be obtained through low-temperature calcination and water leaching, and the energy consumption is low.

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.