38 results about "Sodium sulphide" patented technology

The application provides a kind of sodium sulfide nine hydrate and activated olefin / acetylene preparation polyether and its method, belong to sulfur-containing polymer technical field.The structural formula of polyether in the application, R 1 And R 2 Independently be substituted or unsubstituted alkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl;The number of carbon atoms of the alkyl is 1-10, the number of carbon atoms of alkoxy is 1-10, the number of carbon atoms of aryl is 1-30, the number of carbon atoms of heteroaryl is 3-30;Substituted alkyl and substituted alkoxy independently are one or more;N is an integer of 2-4000.The application is used as sulfur source sodium sulfide nine hydrate, under the condition of no metal catalyst, polyether is synthesized by polymerization reaction;Reaction condition is mild, reaction is efficient, economic and environmental protection, meet the current green production concept and can avoid the use of dangerous reagent.

This invention relates to the field of mineral processing technology, specifically to an environmentally friendly copper-molybdenum separation inhibitor, its preparation method, and its application. The method includes: mixing starch and formamide, stirring at room temperature, cooling in an ice-water bath at -5°C, slowly adding chlorosulfonic acid at this temperature to initiate a sulfonation reaction, neutralizing to pH 7-8 with sodium hydroxide solution after the reaction, adding anhydrous methanol to precipitate the product, and washing and drying to obtain the sulfonated anionic starch polymer DGSS. The inhibitor is applied to the flotation separation of copper-molybdenum mixed concentrates, combined with a closed-circuit process of one roughing, one scavenging, and four cleaning stages, employing a gradient reagent reduction and staged kerosene replenishment system from roughing to cleaning. This allows for selective inhibition of copper sulfide minerals such as chalcopyrite at extremely low dosages, with minimal impact on the floatability of molybdenite. It completely avoids the use of toxic substances such as cyanide, Knox reagent, or sodium sulfide, exhibiting good selectivity, low reagent consumption, environmental friendliness, and a simple preparation process that is easy to industrialize.

The application discloses a kind of high oxidation rate lead-zinc oxide ore aerated sulphidation flotation and tailings discharge process, belong to mineral processing technical field.The method includes the following steps: grinding to lead-zinc oxide ore raw ore, obtain slurry;Sodium sulfide is added to slurry, and under the condition of aerated stirring, sulphidation reaction is carried out, and sulphidation slurry is obtained;Collector and foaming agent are added to sulphidation slurry, and flotation is carried out, and lead concentrate and zinc concentrate are obtained.The application introduces forced aerated stirring in the sulphidation process, strengthens the mass transfer process among gas-liquid-solid three phases, promotes the generation of dense, stable lead sulfide film on the surface of lead oxide minerals, solves the problem of low sulphidation efficiency of traditional sulphidation process.The application is used to treat refractory lead-zinc oxide ore containing Pb 5.59%, Zn 44.02%, oxidation rate more than 90%, and closed-circuit test can obtain qualified lead concentrate with lead grade of 60.72% and lead recovery rate of 79.53%, while lead flotation tailings directly become zinc concentrate with zinc grade of 46.33% and zinc recovery rate of 98.41%, realizing efficient separation of lead and zinc and tailings discharge.

This invention discloses a method for activated flotation of copper oxide ore, belonging to the field of mineral processing technology. The method includes: grinding and preparing the copper oxide ore into a pulp, then adding a small amount of sodium sulfide for catalytic oxidation to form an initial sulfide layer on the surface of the cuprite; subsequently adding sodium sulfide again to deeply activate the cuprite using the CuO layer as the reaction center, forming a stable and dense sulfide layer on the mineral surface; and then adding a collector and a frother for flotation. This invention, through the combination of catalytic oxidation and deep activation, significantly improves the sulfidation effect on the surface of cuprite and reduces the amount of sulfiding agent used, resulting in a significantly higher recovery rate of copper oxide ore, primarily cuprite, compared to direct sulfidation flotation. The copper oxide ore flotation method provided by this invention is simple, suitable for industrial production, and can achieve efficient recovery of refractory copper oxide ore, primarily cuprite.

This invention discloses a solidification and stabilization agent and treatment method for sieved humic soil in landfills. The agent comprises: a cementing component, a heavy metal stabilizing component, an organic matter passivating component, a pore-regulating component, and a process conditioning component. The cementing component includes steel slag, fly ash, and sulfoaluminate cement; the heavy metal stabilizing component includes calcium dihydrogen phosphate and sodium sulfide; the organic matter passivating component includes potassium permanganate; the pore-regulating component includes desulfurized gypsum and an air-entraining agent; and the process conditioning component includes a polycarboxylate superplasticizer and a triethanolamine early-strength agent. This invention provides core strength through a synergistic cementing system of steel slag-fly ash-sulfoaluminate cement, combines a phosphate-sodium sulfide dual stabilization mechanism to fix heavy metals, uses potassium permanganate to oxidize and passivate humic acids, and introduces desulfurized gypsum and an air-entraining agent to regulate the pore structure. The agent of this invention can significantly improve the mechanical properties of the solidified body, reduce permeability, and effectively inhibit the leaching of heavy metals and organic pollutants.

The invention discloses a method for enriching trace cobalt in ultra-low vanadium titano-magnetite iron ore concentrate, and belongs to the technical field of metallurgy. The invention provides a separation and enrichment method for enriching trace cobalt elements in ultralow-grade vanadium titano-magnetite iron concentrate, which comprises the following steps: by taking ultralow-grade vanadium titano-magnetite iron concentrate with the cobalt content of 0.01-0.03% as a raw material, grinding, dehydrating and drying; then carrying out oxidizing roasting at 890-905 DEG C; water is added into the roasted product for size mixing, and the pH is adjusted to 10-11; flotation is carried out with sodium sulfide as a vulcanizing agent, amyl xanthate as a collecting agent, terpenic oil as a foaming agent and water glass as an inhibitor, and cobalt rough concentrate is obtained; and amyl xanthate and terpenic oil are supplemented, fine selection and purification are carried out, and cobalt concentrate is obtained. According to the method, the high-grade cobalt concentrate is enriched from the ultralow-grade iron concentrate, the cobalt grade is 17-20%, and the recovery rate is 80-90%.

This invention belongs to the field of resin preparation technology, specifically relating to a polyphenylene sulfide resin and its preparation method. The preparation method includes the following steps: a composite stabilizer, anhydrous sodium sulfide, and a polar solvent are first mixed; the resulting first mixture undergoes a dehydration reaction to obtain a dehydrated reaction solution; the dehydrated reaction solution is then mixed with p-dichlorobenzene; the resulting second mixture undergoes prepolymerization and postpolymerization sequentially to obtain the polyphenylene sulfide resin; the composite stabilizer includes carbodiimide having the structure of formula I, lithium chloride, and sodium hydroxide; R 1 -(N=C=N) n -R 2 Equation I; n is an integer from 1 to 20; R 1 and R 2 The polymer is independently selected from substituted or unsubstituted alkyl, cycloalkyl, aryl, or aralkyl groups. The composite stabilizer in this invention effectively inhibits excessive hydrolysis by polar solvents, improves reaction efficiency, and controls the polymer molecular structure, thereby obtaining high molecular weight, high yield, and high whiteness PPS resin.

This application discloses a method for preparing anhydrous sodium sulfide, comprising: reacting sodium sulfide hydrate with hexamethyldisilazane to obtain ammonia gas and a reaction solution containing anhydrous sodium sulfide; performing solid-liquid separation on the reaction solution, collecting the solid, and obtaining anhydrous sodium sulfide. The method of this application can efficiently remove water of crystallization from sodium sulfide hydrate, achieving a water removal rate of 99.99%. The process is simple, easy to operate, and has low energy consumption, making it suitable for industrial production.

The application relates to the technical field of batteries, in particular to a positive electrode material and a preparation method and application thereof. The positive electrode material comprises a substrate and a coating layer coated on at least part of the surface of the substrate; the substrate comprises sodium pyrophosphate; the coating layer comprises carbon material and sodium sulfide; the carbon material comprises a doping element; and the doping element comprises S and F. Compared with the prior art, the application improves the electronic conductivity of the sodium pyrophosphate positive electrode material by doping the double coating layer with carbon and sodium sulfide in combination with sulfur and fluorine, and further applies the sodium pyrophosphate positive electrode material in a sodium ion battery to improve the electrochemical performance.

The utility model belongs to the technical field of recycling devices, and discloses a sodium sulfide waste alkali liquor resource recycling device which comprises a recycling box, a bottom cover is installed at the bottom of the recycling box through a thread structure, a feeding pipe is fixedly installed at the top of the recycling box, and a recycling mechanism is arranged in the recycling box. The recycling mechanism comprises a separation frame, a partition plate, a mounting plate, a mounting column and an extension piece, and the separation frame is fixedly mounted in the recycling box; according to the sodium sulfide waste alkali liquid recycling device, water vapor generated in the evaporation process of sodium sulfide waste alkali liquid in the recycling box can circularly flow in the recycling box through the first circulating groove and the second circulating groove by arranging the separation frame, so that the water vapor can be frequently in contact with the mounting columns on the outer side of the separation frame; and the water vapor crystal powder can be attached to the extension piece through the extension piece on the side wall of the mounting column, so that a medium with light mass can be recovered, and the recovery efficiency of the sodium sulfide crystals is higher.

The application discloses a kind of multistage recovery device of hydrogen sulfide in sulfuration dearsenification tail gas and process thereof, it is related to tail gas processing technical field, the four processes of desorption pretreatment of excess hydrogen sulfide gas, dirty acid stock solution exposure recovery, dirty acid spray recovery and sodium hydroxide solution spray recovery are included in the application;Among them, desorption tower desorbs hydrogen sulfide in sulfuration liquid, and pretreatment tank is contacted with arsenic-containing dirty acid and desorption tail gas and excess tail gas of sulfuration reaction, to realize first efficient recovery;Tail gas aeration stock solution tank completes secondary recovery while stirring dirty acid;Dirty acid stock solution spray process realizes third recovery;Sodium hydroxide solution is recycled by three-stage spraying to generate sodium sulfide solution, to achieve final recovery.The process through four recovery processes not only reduces the concentration of arsenic and heavy metals in arsenic-containing dirty acid, but also improves the utilization rate of hydrogen sulfide by more than 10%, reduces the consumption of sodium hydroxide by more than 70%, ensures that the tail gas meets the emission standard, and significantly reduces the production cost.

This invention provides a method for preparing sodium sulfide from industrial sodium sulfate, belonging to the field of metallurgical environmental protection technology. The method involves adding sodium sulfide powder obtained in a previous step to a mixture of sodium sulfate and activated carbon powder, followed by high-temperature calcination at 700-850℃ to efficiently obtain sodium sulfide; the conversion rate of sodium sulfate can reach 92%. Furthermore, the reaction temperature is reduced from over 950℃ in traditional methods to 700-850℃, significantly reducing energy consumption and production costs. This invention treats industrial sodium sulfate, achieving large-scale conversion of solid waste sodium sulfate, and has significant utilization value. In addition, the method for preparing sodium sulfide from industrial sodium sulfate is carried out at a temperature below the melting point of the reactants, solving the problems of melt corrosion and difficult discharge after solidification in traditional methods.

This invention relates to the field of electronic materials technology, and discloses a spherical shell copper sulfide powder material and its preparation process. The preparation process includes: mixing copper hydroxide with additives and grinding, followed by multi-stage temperature calcination to obtain copper oxide; dispersing copper oxide in water, adding a sulfur source solution to react and generate copper sulfide; and obtaining the spherical shell copper sulfide powder material through solid-liquid separation, washing, drying, and granulation. The additives are sodium sulfate or sodium chloride, added at 3%–10% of the mass of copper hydroxide; the sulfur source is sodium sulfide or sodium hydrosulfide, with a copper-sulfur molar ratio of 1:1 to 1:2; calcination is performed in multiple temperature zones below 200℃, 200–300℃, 300–400℃, and 450–500℃, followed by annealing; the solid content of copper oxide in the reaction is ≤20%, the concentration of the sulfur source is ≤20%, and the stirring speed is controlled in stages. This process is mild, uses safe raw materials, and has a simplified procedure. The obtained powder material has a hollow spherical shell structure and can be used to prepare infrared interference or shielding materials.

This invention discloses an enzymatic hair removal device and method for reducing hydrogen sulfide at the source. It aims to use a biological enzyme bath as the hair removal solution to avoid the malodorous smell of hydrogen sulfide and sulfide pollution in wastewater caused by traditional depilatory agents such as sodium sulfide or sodium hydrosulfide. The device includes a housing, a rotating drum, and a comb plate. The housing has a storage chamber and a hair discharge port on the front. The rotating drum is located within the storage chamber, with hair discharge grooves on its circumference, radially protruding protrusions on its inner side, and comb teeth on its outer circumference. The comb plate is inclined within the drum, with one side contacting the circumference of the drum and the other side extending from the hair discharge port to the outside of the housing. The side of the comb plate in contact with the drum has comb grooves corresponding to the comb teeth. During the hair removal process, the rotating drum and the comb plate work together to promptly collect and discharge shed animal hair, preventing it from tangling and forming balls, reducing the amount of hair retained in the storage chamber, and mitigating the problems of reduced enzyme concentration and decreased hair removal efficiency caused by hair adsorbing the hair removal solution.

This invention discloses a method for reducing lead loss in rare earth concentrates. The method includes the following steps: preparing a solution of dichlorvos at a certain concentration and adjusting its pH to 1-9 using hydrochloric acid; adding the dichlorvos solution to the lead-containing rare earth concentrate under specific temperature and acidity conditions, stirring thoroughly to react and selectively form lead complex precipitates; after the lead removal reaction, if the dichlorvos content in the concentrate exceeds the standard, adding magnesium chloride to remove the excess dichlorvos; and separating the solid and liquid phases to obtain a low-lead rare earth solution and lead slag, and analyzing their composition. Compared to the traditional sodium sulfide lead removal process using rare earth solutions, this invention avoids the precipitation loss of rare earth hydroxide and the generation of toxic hydrogen sulfide gas, and has the advantages of simple operation, low cost, and environmental friendliness, making it highly promising for industry promotion.

The application discloses a preparation method of a thio-carboxylic acid ester silane coupling agent, and comprises the following steps: S1: deionized water and an organic solvent are matched into a water-organic mixed solvent; sodium sulfide is added and stirred until no solid particles are generated, then a phase transfer catalyst is added and octanoyl chloride is added dropwise, after dropwise addition is completed, secondary stirring is carried out, and a sodium thio-octanoate water-organic mixed catalytic liquid is prepared; S2: chloromethylphenethyltriethoxysilane and chloropropyltriethoxysilane are added into the catalytic liquid obtained in S1; then the pH value of the system is adjusted to weak alkalinity, the stirring speed is increased, and after temperature is increased, constant-temperature stirring reaction is carried out; S3: the reaction liquid is allowed to stand and phase separation is carried out, the organic phase is taken and washed to neutral; the organic phase after water washing is subjected to gradient reduced-pressure rectification, and finally, the product is obtained. The preparation method realizes high-efficiency cooperation of directional thio-substitution of chloropropyltriethoxysilane and more than 99% retention of benzyl chlorine groups of chloromethylphenethyltriethoxysilane, the stability and batch consistency of the reaction are good, and the product is high in purity and good in stability.

This invention provides a method for preparing high-purity lithium sulfide using a modified solvent system and a metathesis method, comprising the following steps: S1: Under an inert atmosphere or air atmosphere, weigh lithium chloride and sodium sulfide in a molar ratio of 2:1 and dissolve them in a solvent system; S2: Stir the solution system obtained in S1 to generate lithium sulfide precipitate; S3: After the reaction is complete, separate the reaction system to remove the byproduct sodium chloride and unreacted raw materials, obtaining crude lithium sulfide; S4: Recover the solvent from the solution obtained in S3, and perform low-temperature heat treatment on the crude lithium sulfide under an inert atmosphere to obtain high-purity lithium sulfide. This invention uses an ethanol-isopropanol mixed solvent system, which effectively adjusts the solvent polarity, improves the solubility of LiCl and Na2S, and increases the reaction rate and conversion rate; the introduction of an ionic liquid-assisted solvent system further regulates the nucleation and growth process of Li2S, resulting in more uniform product particle size.

This invention provides a fly ash adsorbent, its preparation method, and its application, belonging to the technical field of fly ash reuse and dye-containing wastewater treatment. The invention mixes sodium sulfide with fly ash in water, causing the sodium sulfide to react with heavy metal ions (such as zinc, chromium, and lead) in the fly ash, forming insoluble sulfide precipitates. This stabilizes the heavy metal ions and prevents toxic heavy metal leaching during adsorbent use. Furthermore, the resulting fly ash adsorbent has a porous structure and a large specific surface area, providing more physical adsorption sites for adsorbing dye molecules via van der Waals forces. The resulting fly ash adsorbent remains weakly alkaline, and its surface hydroxyl groups can further bind with dye molecules through electrostatic attraction or hydrogen bonding, forming surface complexes for further decolorization.

The application discloses a method and system for preparing anhydrous flaky sodium sulfide by using industrial waste salt containing sodium sulfate, and can realize direct continuous sheeting of high-purity high-temperature sodium sulfide melt (about 1000 DEG C) to obtain anhydrous flaky sodium sulfide product by means of high-efficiency continuous reduction reaction technology and high-temperature melt synchronous cooling and sheeting solidification technology, so as to achieve the purpose of continuous treatment and high-value utilization of industrial waste salt containing sodium sulfate. The application can greatly reduce the process flow and improve the production efficiency under the premise of ensuring the purity of the product, and has the advantages of small equipment area, simple operation, high production efficiency, short process operation flow, low energy consumption, high product quality, wide market prospect and remarkable economic benefits, and provides a new technical idea for preparing anhydrous flaky sodium sulfide by using industrial waste salt containing sodium sulfate.

This invention discloses a ternary transition metal sulfide (CuCoNiS) x The preparation method of electrode materials and their performance in electrocatalytic sulfur oxidation (SOR) coupled hydrogen production. Ternary transition metal hydroxides were prepared by electrodeposition using copper nitrate (Cu(NO3)2), nickel nitrate (Ni(NO3)2), and cobalt nitrate (Co(NO3)2) as copper, nickel, and cobalt sources, respectively. Based on this, CuCoNiS was prepared by hydrothermal in-situ sulfidation using sodium sulfide as the sulfur source. x Compared to single-site copper sulfide (CuS), the introduction of Co and Ni effectively modulates the electronic structure of the catalyst, enhancing its conductivity and structural stability, and significantly improving its catalytic activity and resistance to sulfur poisoning in the electrocatalytic sulfur oxidation reaction (SOR). The catalyst prepared in this invention exhibits excellent electrocatalytic performance and long-term stability, and the synthesis process is relatively simple. It is suitable for energy conversion fields such as hydrogen sulfide decomposition to produce hydrogen, showing good prospects for industrial application.

The present application relates to a kind of method and system for removing COD and thallium in flue gas desulfurization wastewater, method includes: the water quality characteristics of flue gas desulfurization wastewater are pre-configured for removing COD and thallium in flue gas desulfurization wastewater coagulant and modified filler adsorbent, coagulant is compounded by sodium hypochlorite, sodium sulfide solution and powdered activated carbon, and modified filler adsorbent is prepared by diatomite, sodium sulfate solution and ferric chloride;Flue gas desulfurization wastewater is sent into coagulation sedimentation tank, and coagulant is added into coagulation sedimentation tank;The supernatant after being treated by coagulation sedimentation tank is sent into modified filler adsorption tower, and modified filler adsorption tower is filled with modified filler adsorbent.By the water quality characteristics of flue gas desulfurization wastewater configuration for removing COD and thallium in flue gas desulfurization wastewater coagulant, and modified filler adsorbent, after being treated, flue gas desulfurization wastewater can reach steel industry wastewater discharge standard, can be directly discharged, also can be reused according to demand.

This invention provides a method for extracting lithium from lepidolite using sodium sulfide, relating to the field of resource utilization technology. The method includes the following steps: Step S1, lepidolite is fed into a planetary ball mill for grinding and crushing; the crushed material is then screened to obtain screened material; Step S2, the screened material is uniformly mixed with anhydrous sodium sulfide at a weight ratio of 1:1 to 3; the mixture is then subjected to high-intensity grinding, and mechanical energy triggers a chemical reaction between the lepidolite and anhydrous sodium sulfide to obtain reactant material. When using a combination of mixed grinding and water leaching to extract lithium from lepidolite, sulfation and defluorination heat treatment are eliminated, effectively improving lithium extraction efficiency; and the lithium precipitation mother liquor is recycled back to the "sodium sulfide preparation" step, achieving resource recycling of sodium, which conforms to energy-saving and environmentally friendly development standards.

This invention discloses a wet-process phosphoric acid purification and arsenic removal system, arsenic removal process, and its application, relating to the field of wet-process phosphoric acid purification and impurity removal technology. The system includes a phosphoric acid feed tank, a Venturi jet reactor, a tubular scrubbing absorber, a reaction washing and ripening tank, and a hydrogen sulfide reactor connected in sequence. The hydrogen sulfide reactor is also connected to the Venturi jet reactor. An arsenic removal filter assembly is connected to the reaction washing and ripening tank, and this filter assembly is connected to the phosphoric acid feed tank. A purification and arsenic removal process and its application are also provided. The system has a compact design, reasonable layout, simple equipment structure, and low operation difficulty, effectively reducing the addition of sodium sulfide. The system is in a closed state, effectively controlling the safety risk of hydrogen sulfide leakage, resulting in high safety; the impurity removal efficiency is high. This solves the problem of existing arsenic removal systems having a large amount of sodium sulfide added, which easily leads to hydrogen sulfide leakage and low safety.

The application discloses a kind of wet-process phosphoric acid purification methods based on multistage centrifugal extraction, belong to the technical field of refined phosphoric acid.The method sequentially includes: sequential pretreatment, centrifugal extraction, centrifugal washing and centrifugal stripping.Said sequential pretreatment uses one-pot method, first add H2O2 decolorization, then add sodium carbonate, calcium carbonate, sodium sulfide with nine water for defluorination, desulfurization, arsenic removal.Said centrifugal extraction, centrifugal washing and centrifugal stripping all use 5-stage centrifugal extractor in series, and specific temperature and speed range are controlled respectively.The application is through the synergistic effect of "sequential pretreatment+multistage centrifugal+parameter adaptation", effectively solves the problems of emulsification, phase separation difficulty, large equipment and high energy consumption in traditional solvent extraction method, realizes the efficient, low-consumption purification of wet-process phosphoric acid, and the obtained purified phosphoric acid has very high purity, which can be directly used in high-value-added fields.

The invention provides a high-purity sodium sulfide preparation method based on homogeneous reaction, and belongs to the technical field of new energy battery materials, the preparation method comprises the following steps: S1, under the protection of inert atmosphere, dissolving thiourea and sodium alkoxide in an anhydrous alcohol organic solvent, and heating to a solvent reflux temperature for reaction; s2, after the reaction is finished, carrying out solid-liquid separation on a reaction solution under the protection of an inert atmosphere to obtain a sodium sulfide solid and a mother solution; and S3, washing the sodium sulfide solid with preheated absolute ethyl alcohol, and performing vacuum drying to obtain the high-purity sodium sulfide. By constructing a homogeneous reaction system, the reaction is more thorough, the product is precipitated in a single solid phase and is easy to separate, the purity of the prepared sodium sulfide product is more than or equal to 99%, the reaction condition is mild, the solvent can be recycled and reused, the green chemistry principle is met, and industrial production is easy.

This invention discloses a novel process for preparing feed-grade zinc sulfate from lead-zinc ore. The main steps include: 1) crushing the lead-zinc ore to obtain ore powder; 2) adding industrial sulfuric acid and a composite activator to the ore powder, stirring and leaching to obtain a leachate; 3) adding hydrogen peroxide to the leachate to carry out an oxidation reaction, and adjusting the pH to allow Fe to precipitate. 3+ 4) After complete precipitation and filtration, solution ① is obtained; 5) Active zinc powder is added to solution ① to carry out a displacement reaction; hydrogen sulfide gas is introduced or sodium sulfide solution is added; after filtration, solution ② is obtained; 6) Nanofiltration membrane separation technology is used to retain components in solution ② with molecular weights in the range of 200~500 Da; food-grade citric acid is added to adjust the pH to 5.0~5.5 to obtain solution ③; 7) Solution ③ is evaporated, crystallized and dried to obtain feed-grade zinc sulfate. Using the process flow of this invention, the zinc leaching rate is greater than 98.9%, and the obtained zinc sulfate product is excellent, superior to the feed-grade zinc sulfate standard, and has broad application prospects.

This invention belongs to the field of electrocatalytic material preparation technology, and discloses a method for preparing an electrocatalyst with a Fe and Mn co-doped Ni3S2 nanorod array structure. A simple one-step hydrothermal method is used to dissolve ferric chloride hexahydrate, manganese acetate tetrahydrate, and sodium sulfide nonahydrate in deionized water. After stirring and dissolving, the solution is transferred together with nickel foam to a high-pressure reactor. After hydrothermal reaction, the catalyst is washed and dried to obtain the electrocatalyst. This catalyst exhibits good performance in both alkaline freshwater and seawater, and possesses excellent stability and corrosion resistance. The electrocatalytic material prepared by this invention has a unique nanorod array structure, providing more active sites for the reaction, accelerating the electron transfer rate, and thus improving the electrocatalytic water splitting performance.

The present application belongs to the technical field of lithium iron phosphate battery recycling, and particularly relates to a method for removing aluminum from lithium iron phosphate black powder, comprising the following steps: (1) mixing lithium iron phosphate black powder with water to prepare a slurry; (2) mixing the slurry prepared in step (1) with an aluminum removal liquid, heating and reacting under stirring, and then performing solid-liquid separation to obtain a first filtrate and a filter residue, and washing the filter residue to obtain aluminum-removed lithium iron phosphate; the aluminum removal liquid is prepared by mixing a solute with a solvent, and the solute comprises sodium chloride, sodium sulfide, sodium phosphate and sodium oxalate.

The application belongs to the technical field of sodium sulfide preparation, and discloses a method and system for preparing sodium sulfide by electric heating reduction of sodium sulfate. The method comprises the following steps: adding by-product sodium sulfate as raw material into a rotary kiln, and preheating the raw material by using secondary flue gas; feeding the preheating product into an electric heating reduction furnace, heating the material in the furnace by using an electrode, and spraying a reducing agent into the furnace by using inert gas or nitrogen as carrier gas to perform a reduction reaction; sending the flue gas generated in the reaction into a re-combustion chamber, obtaining the secondary flue gas based on secondary combustion under hot air, and sending the secondary flue gas into the rotary kiln; sending the molten high-temperature sodium sulfide obtained in the reaction into a heat exchanger to perform non-contact heat exchange with air, obtaining cooled sodium sulfide product and the hot air, and sending the hot air into the re-combustion chamber. The application can improve the mixing condition in the furnace, strengthen the mass and heat transfer process, improve the reaction efficiency, and reduce energy consumption.

The application discloses a high-yield and low-energy-consumption sulfur-containing solid waste resource treatment process and system, and relates to the field of waste treatment.The process comprises the following steps: mixing and granulating sulfur-containing waste salt and waste carbon material, performing microwave-assisted reduction calcination to obtain a calcination product containing sodium sulfide; performing leaching and solid-liquid separation on the calcination product to obtain a sodium sulfide solution and solid residues; recycling the solid residues after treatment; performing double decomposition reaction on the sodium sulfide solution and a lithium salt solution under the action of a supported catalyst to generate lithium sulfide precipitation and by-product sodium salt solution; performing washing and drying on the lithium sulfide precipitation to obtain high-purity lithium sulfide product; and recycling by-product sodium salt through concentration and crystallization of the by-product sodium salt solution, and recycling the mother liquor.The application further discloses a sulfur-containing solid waste resource treatment system.The application reduces energy consumption through microwave-assisted reduction calcination, realizes catalyst recycling through a fixed bed of supported catalyst, and improves lithium yield through mother liquor recycling, and has the advantages of low energy consumption, high yield, green process, high product purity and the like.