401 results about "Sodium sulphide" patented technology

The invention relates to the technical field of sewage treatment, in particular to a wastewater recycling method which comprises the following steps: cyanide breaking: in an alkaline environment, adding an oxidizing agent to oxidize wastewater; first monitoring: monitoring the oxidation reduction potential and the free cyanide concentration in real time, and adjusting the adding proportion of sodium hypochlorite based on the ORP dynamic range and the cyanide concentration attenuation rate; precipitation: adding hydroxide, and carrying out heavy metal precipitation; second monitoring: acquiring component information in the sewage, and adding sodium hydroxide and sodium sulfide in a gradient compensation manner after triggering judgment; membrane treatment: performing filtration and degradation treatment through a biological membrane; 3, monitoring: dynamically adjusting the aeration intensity and the backwashing period according to the coupling relationship between the pressure difference slope and the sludge concentration; and 4, monitoring: calculating a process capability index, judging whether the process capability index is smaller than a third threshold value, and if so, adjusting the sodium sulfide dosage in the precipitation stage. The method has the effect of reducing resource waste in the wastewater treatment process.

The invention discloses a method for comprehensively recovering lithium beryllium resources in spodumene tailings, and belongs to the technical field of mineral separation. The method comprises the steps that after spodumene tailings are subjected to size mixing, amine and fatty acid serve as a combined collecting agent, flotation I is conducted, and mica concentrate and tailings I are obtained; after size mixing is conducted on the tailings I, sodium sulfide and phosphate serve as a combined inhibitor, a metal-hydroximic acid organic complex and fatty acid serve as a combined collecting agent, flotation II is conducted, and lithium beryllium bulk concentrate and tailings II are obtained; and after size mixing is conducted on the lithium beryllium bulk concentrate, flotation III is conducted with phosphate and EDTA as a combined inhibitor and fatty acid as a collecting agent, and beryllium concentrate and lithium-containing tailings are obtained. By means of the method, the beryllium concentrate with the BeO grade being 4.448% and the recovery rate being 64% can be obtained, meanwhile, the lithium concentrate with the Li2O grade being 4.8% and the recovery rate being 57.6% can be produced, deep comprehensive recovery of the lithium beryllium resources in the spodumene tailings is effectively achieved, and the economic benefit capacity is large.

The invention relates to the technical field of resource recycling of manganese-containing wastewater, in particular to a process for preparing industrial-grade manganese carbonate by using a recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, performs primary purification and impurity removal by using sodium sulfide and sodium fluoride, and performs secondary impurity removal by using iminodiacetic acid grafted chelating resin. According to the invention, the problems of poor adaptability and incomplete impurity removal of the manganese chloride solution in the prior art are solved, the purity of the product is obviously improved so as to meet the requirements of the industrial grade manganese carbonate, and the process flow is simple.

The present disclosure provides a polymetallic-ore beneficiation and separation reagent, a preparation method therefor and use thereof. The preparation method for a polymetallic-ore beneficiation and separation reagent, includes following steps: (1) mixing a substance A, caustic soda, soda ash and sodium polysulfide, and then heating the same and performing a catalytic reaction, to render an intermediate product B, wherein the substance A includes one or more of urea, glycine, urea peroxide, ammonium cyanate and isocyanic acid; and (2) mixing the intermediate product B with trichloroisocyanuric acid, dichloroisocyanuric acid and 2-amino-3-(4-imidazolyl)propanoic acid, to render the polymetallic-ore beneficiation and separation reagent.

The invention provides a process for preparing high-purity lithium sulfide based on industrial waste salt recycling, which comprises the following steps: S1, mixing sulfur-containing waste salt and a waste carbon material, granulating, reducing, calcining, separating and purifying to obtain solid sodium sulfide; s2, mixing and ball-milling the obtained solid sodium sulfide and lithium chloride, adding a mixture of a catalyst and ethanol, and performing catalytic reaction to obtain a lithium sulfide crude product; and S3, purifying and drying the obtained lithium sulfide crude product to obtain the lithium sulfide. The method not only can break through the bottleneck of the existing production route, but also can realize the strategic direction of high-value utilization of bulk solid wastes, and has far-reaching significance for promoting sustainable development and green transformation of the battery industry.

The invention relates to the technical field of catalyst processing, and discloses a high-activity transition metal phosphide electrolyzed water catalyst and a preparation method thereof, and the high-activity transition metal phosphide electrolyzed water catalyst comprises the following components by weight: 1-3 parts of cobalt chloride hexahydrate; 0.5 to 1.5 parts of ruthenium trichloride; 0.5 to 1.5 parts of iridium chloride (III) hydrate; 1-2 parts of copper sulfate pentahydrate; 2 to 4 parts of sodium hypophosphite; 1 to 2 parts of urea; 1 to 2 parts of glucose; 1-2 parts of sodium sulfide nonahydrate; 0.5 to 1 part of crystalline aluminum chloride; 50 to 100 parts of deionized water; and 0.1 to 0.5 part of hexadecyl trimethyl ammonium bromide. By introducing the plasma auxiliary treatment technology, the electronic structure of the catalyst is optimized, the conductivity and stability of the catalyst are improved, and the efficiency and durability of hydrogen production through water electrolysis are enhanced.

The invention relates to the technical field of high polymer materials, and discloses a synthesis method of low-chlorine polyphenylene sulfide nitrile, which comprises the following steps: carrying out pressurized prepolymerization reaction on a sodium sulfide solution and p-dichlorobenzene to obtain a first prepolymerization reaction product; carrying out copolymerization prepolymerization reaction on the first prepolymerization reaction product and 2, 6-dichlorobenzonitrile to obtain a second prepolymerization reaction product; carrying out heating polymerization reaction on the second prepolymerization reaction product and benzyl chloride to obtain a heating polymerization reaction product; and raising the temperature of the polymerization reaction product, and carrying out phase separation to obtain the low-chlorine polyphenylene sulfide nitrile. Under the condition of no auxiliary agent, the polymerization process of inert gas pressurization and phase separation is adopted, benzyl chloride is applied to adjust the end group, low-chlorine high-molecular-weight polyphenylene sulfide nitrile can be obtained in a short time, the production efficiency of synthesizing polyphenylene sulfide nitrile can be improved, the purification process of byproduct sodium chloride is shortened, auxiliary agent recovery is omitted, and the production cost is reduced. The engineering construction investment is reduced, and the production cost for manufacturing the polyphenylene sulfide nitrile is greatly reduced.

The invention discloses a polyphenylene sulfide oligomer separation method, which comprises: cooling a polyphenylene sulfide product synthesized by a sodium sulfide polymerization reaction, carrying out centrifugation, and carrying out solid-liquid separation to obtain polyphenylene sulfide and a mother solution; the preparation method comprises the following steps: putting polyphenylene sulfide into an aqueous solution of diethanol amine and 1, 3-dimethyl-2-imidazolinone for washing, and collecting a washing solution; mixing the washing solution and the mother solution, carrying out candle type filtration to obtain a filter cake, washing the filter cake with deionized water, and drying to obtain a polyphenylene sulfide oligomer; according to the method, the polyphenylene sulfide is washed in the aqueous solution of the diethanol amine and the 1, 3-dimethyl-2-imidazolinone, oligomer in the polyphenylene sulfide can be better washed out, meanwhile, the polyphenylene sulfide oligomer in the mother solution and the washing solution can be separated from other substances through the addition of the diethanol amine and the 1, 3-dimethyl-2-imidazolinone, and therefore the polyphenylene sulfide can be better washed out. The yield and the purity of the polyphenylene sulfide oligomer are improved.

The invention relates to a method for recovering platinum in nickel-platinum waste. The method comprises the steps of hot nitric acid dissolution, filtration, pH adjustment, selective precipitation and drying. The characteristic that hot nitric acid can completely dissolve Ni and partially dissolve Pt is utilized to achieve preliminary separation of NiPt, sodium sulfide is used as a precipitator, selective precipitation of platinum is achieved through the Ksp difference of platinum sulfide and base metal sulfide within the pH range of 1-2, the recovery rate of platinum is greatly increased, and energy consumption of the platinum recovery process is reduced. Emission of a large amount of volatile acid is avoided while economic benefits are improved, and the method is more suitable for actual production.

The invention provides a method for removing nitrate in water by using a modified zero-valent iron aerogel electrocatalyst, which comprises the following steps: preparing a mixed solution of ferrous sulfate and sodium sulfide, preparing a sodium borohydride solution, mixing and magnetically stirring the mixed solution and the sodium borohydride solution to obtain black colloid, and finally obtaining vulcanized zero-valent iron aerogel, dispersing the obtained sulfurized zero-valent iron aerogel and a Nafion solution in absolute ethyl alcohol to prepare a catalyst mixed solution; potassium nitrate and potassium hydroxide are dissolved in a pure water solution to serve as electrolyte, a sulfurized zero-valent iron aerogel electrode is used as a cathode, a platinum sheet is used as an anode, a mercuric oxide electrode is used as a reference electrode, and an electrocatalytic reduction reaction is carried out by using a three-electrode system. The technology not only can improve the efficiency of water nitrate pollution treatment, but also conforms to the concept of green and low-carbon development, and has a wide environment application prospect.

The invention relates to the technical field of cement preparation, and particularly discloses dry-process clinker cement and a preparation process thereof. The dry-process clinker cement comprises the following raw materials in parts by weight: 180-200 parts of limestone; 30-50 parts of iron tailing powder; 20 to 30 parts of coal gangue; 10 to 20 parts of fly ash; 5-8 parts of calcium fluoride; 5-8 parts of nano silicon dioxide; 1-5 parts of nano calcium carbonate; 1-5 parts of sodium sulfide; 1-5 parts of a charcoal-ferrous sulfate loading material; 100 to 200 parts of water; 5-20 parts of a sintering aid; the biochar-ferrous sulfate loading material is obtained by loading ferrous sulfate on biochar particles. According to the dry-process clinker cement disclosed by the invention, the reduction activity and chromium removal efficiency of the ferrous sulfate can be effectively enhanced through the charcoal-ferrous sulfate loading material, so that hexavalent chromium in the cement can be efficiently removed by using a relatively small amount of ferrous sulfate, and the cement can keep relatively good compressive strength while the cost is reduced.

The invention relates to the technical field of heavy metal adsorption, in particular to a preparation method and application of a heavy metal adsorption material based on lead-zinc tailings, and the preparation method comprises the following steps: S1, grinding the lead-zinc tailings until the particle size is less than 75 microns, and drying; s2, putting the lead-zinc tailings treated in the step S1 into a microwave reactor, and carrying out microwave thermal modification treatment for 5-15 minutes at the power of 600-1000W; s3, the lead-zinc tailings subjected to microwave treatment are soaked in a sodium sulfide solution with the mass concentration being 0.5%-2%, and surface vulcanization treatment is conducted; and S4, heating the lead-zinc tailings subjected to sulfuration treatment to 800-950 DEG C at the speed of 3-10 DEG C / min under the protection of nitrogen, calcining for 1-3 hours, cooling, washing and drying to obtain the heavy metal adsorption material. The adsorption material with a good heavy metal treatment effect is synthesized through microwave thermal modification assisted by surface vulcanization treatment and high-temperature sintering of the lead-zinc tailings.

The invention provides a synthesis method and application of a sulfuration modified palladium-iron bimetallic material. The method comprises the steps that potassium borohydride and sodium sulfide nonahydrate are dissolved in a solvent, sodium hydroxide is added into a sulfuration solution, the pH of the sulfuration solution is adjusted to be alkaline, and an alkaline solution is obtained. The method comprises the following steps: dropwise adding an alkaline solution into a mixed aqueous solution of FeSO4. 7H2O and sodium tetrachloropalladate at a speed of 10mL / min in a nitrogen atmosphere; and separating the precipitate from the mixed aqueous solution in a magnetic separation manner, and washing the precipitate for three times by using oxygen-free water and absolute ethyl alcohol to obtain the palladium iron sulfide bimetallic particles. Through a one-step reduction method of vulcanization and palladium doping, vulcanization modification and bimetal modification are combined to act on zero-valent iron, the stability of the zero-valent iron is enhanced through vulcanization, meanwhile, the reactivity of the zero-valent iron is improved through addition of bimetal, especially the selectivity to pollutants such as chlorinated paraffin and the reactivity after surface passivation are improved, and the stability of the zero-valent iron is improved. And the reliability and efficiency of the zero-valent iron in organic pollution remediation are greatly improved.

The invention relates to the technical field of battery materials, in particular to a preparation method of a lithium sulfide material. The preparation method of the lithium sulfide material comprises the following steps: S1, mixing lithium carbonate and sodium sulfide, heating to a first heating temperature to melt lithium carbonate and react with sodium sulfide, separating out a solid phase, and collecting a first solid; s2, the first solid is heated to a second heating temperature, the second heating temperature is higher than the melting point of sodium carbonate and lower than the melting points of lithium sulfide and sodium sulfide, a solid phase is separated out, and a second solid is collected; s3, the second solid is heated to a third heating temperature, the third heating temperature is higher than the melting point of lithium sulfide and lower than the melting point of sodium sulfide, a liquid phase is separated out, and a liquid lithium sulfide material is prepared; and S4, carrying out curing treatment on the liquid lithium sulfide material to prepare a solid lithium sulfide material. The preparation method improves the reaction conversion rate, simplifies the process flow, reduces the cost and improves the product purity.

The invention discloses a method for preparing raw material phosphoric acid for monopotassium phosphate by multi-stage synergistic purification of wet-process phosphoric acid, and relates to the technical field of wet-process phosphoric acid purification. The method specifically comprises the following steps: firstly, adding part of SiO2 into dilute phosphoric acid, and pumping the dilute phosphoric acid into a defluorination tower for stripping and defluorination; adding the rest SiO2, pumping into a flash chamber, and carrying out vacuum concentration and defluorination; pumping into a desulfurization reaction tank, adding phosphoric ore pulp according to a calcium-sulfur ratio, clarifying the slurry in a thickener after reaction, and filtering the upper overflow clear liquid to obtain desulfurized phosphoric acid; adding sodium sulfide, reacting at normal temperature, heating, continuously reacting, and carrying out solid-liquid separation to obtain dehydrophosphoric acid; and enabling the de-heavy phosphoric acid to sequentially pass through three activated carbon fiber filtering devices which are connected in series, so as to obtain the raw material phosphoric acid which can be directly used for producing the monopotassium phosphate after being purified. A gradient purification system is constructed through concentration defluorination, phosphoric ore pulp desulfurization, sodium sulfide heavy component removal and activated carbon fiber decoloration in a multi-stage process cooperation mode, and step-by-step efficient removal of fluorine, sulfur, heavy metal and pigment in wet-process phosphoric acid is achieved.

The present invention discloses a treatment agent for inhibiting microbial corrosion of carbon steel pipelines in circulating cooling water and a method for using the same, and belongs to the technical field of treatment agents for circulating cooling water. The treatment agent for inhibiting microbial corrosion of carbon steel pipelines in circulating cooling water comprises a first treatment agent and a second treatment agent, wherein the first treatment agent comprises the following components: sodium thiosulfate, a surfactant, dithiothiomethane, an oxidant, and a first precipitant, sodium sulfide; the second treatment agent comprises the following components: sodium thiosulfate, a surfactant, dithiothiomethane, an oxidant, and a second precipitant. The present invention can form an anti-microbial corrosion layer on the surface of a carbon steel pipeline, isolate the direct contact between the carbon steel pipeline and the circulating cooling water, protect the carbon steel pipeline, and inhibit the corrosion of the carbon steel pipeline by microorganisms in the circulating cooling water for a long time.

The invention discloses lithium sulfide and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out ball-milling mixing on iron powder, sodium sulfide and lithium sulfate in a first inert atmosphere to obtain a mixture; (2) calcining the mixture in a second inert atmosphere for the first time to obtain a reaction material; (3) stirring and washing the reaction material with an alcohol solvent in a third inert atmosphere, filtering to obtain filtrate and a filter cake, performing reduced pressure distillation on the filtrate to obtain a lithium sulfide crude product, washing the filter cake with deionized water, and filtering to obtain a solid by-product; and (4) carrying out secondary calcination on the lithium sulfide crude product in a fourth inert atmosphere to obtain lithium sulfide. The preparation method provided by the invention has the advantages of few synthesis steps, simple product purification and environmental protection.

The invention provides a preparation method of a sodium sulfide carbon confinement pre-sodium coating based on monatomic catalysis, and belongs to the technical field of sodium battery materials. Comprising the following steps: mixing cobalt phthalocyanine and melamine powder, performing ultrasonic-assisted mechanical stirring, drying and grinding to obtain composite powder; mixing with sodium sulfate and polyvinylpyrrolidone in proportion, stirring, drying and grinding to obtain precursor powder; the precursor powder is sintered in an argon atmosphere, so that sodium sulfate is converted into sodium sulfide in situ, cobalt atoms in cobalt phthalocyanine are dispersed in a carbon network in a monatomic state, and a monatomic cobalt catalysis-carbon confinement sodium sulfide composite material is prepared; mixing the composite material with a conductive agent, a first binder and a first organic solvent, and performing stirring and defoaming stirring to prepare slurry; and coating the surface of a positive electrode material with the slurry to form a sodium supplementing interface layer, and performing vacuum drying to obtain the positive electrode with the sodium pre-coating. The problems of initial cycle sodium loss and long-term cycle performance reduction of the sodium-ion battery, defects of traditional sodium salt supplementation and the like are solved.

The invention discloses a compound cadmium-reducing conditioner based on radix puerariae residue and wormcast and an application method. The cadmium-reducing conditioner comprises the following components in parts by mass: 35-40 parts of oyster shell powder, 30-45 parts of radix puerariae residue and wormcast, 3-5 parts of zinc fulvic acid, 8-10 parts of sodium sulfide and 3-5 parts of manganese sulfate. The cadmium-reducing conditioner is applied to soil before plowing of rice, plowing is performed after standing, and then the rice is transplanted; the earthworm cast is used for activating organic matter components in the radix puerariae residues, the earthworms are used for removing cadmium in the radix puerariae residues, active components in the radix puerariae residues and the earthworm cast and active components such as amino acid in the oyster shell powder act together with zinc fulvic acid, manganese fertilizer and sodium sulfide, and the oyster shell powder and the radix puerariae residues and the earthworm cast are adsorbed and degraded, so that the cadmium-rich organic fertilizer is obtained. The content of cadmium in the brown rice can be synergistically reduced to about 0.1 mg / kg; the operation is simple, and the raw materials are solid wastes and are easily available.

The invention belongs to the technical field of metallurgy, and relates to a comprehensive recovery method for antimony-containing gold concentrate, which comprises the following steps: S1, mixing antimony-containing gold concentrate and an antioxidant, carrying out size mixing, then adding sodium sulfide and sodium hydroxide to obtain a size, and reacting to obtain a leaching solution and leaching residues; s2, the leachate obtained in the step S1 is subjected to electrodeposition, and crude antimony and barren liquor are obtained; wherein in the step S1, the antioxidant is a mixture of sodium ascorbate and ethylenediamine tetraacetic acid disodium salt. According to the method, the antimony-containing gold concentrate is subjected to antimony leaching through Na2S under the alkaline condition, in order to avoid gold loss caused by the fact that S < 2-> is oxidized into S < x > < 2-> and then the S < x > < 2-> and Au generate AuSx dissolved in an alkaline solution in the leaching process, an antioxidant is added in the leaching process, leaching of gold in the antimony-containing gold concentrate can be remarkably reduced, and the recovery rate of gold is increased.

The invention discloses a papermaking method taking waste grape branches as raw materials. The papermaking method comprises the following steps: (1) cutting back branches: cutting back all sections of annual grape branches; (2) peeling: soaking the cut-back branches in alkali liquor for 48 hours, then taking out the branches, cleaning the branches with clear water, and peeling off barks to obtain peeled branches; (3) cooking: cooking the peeled branches in a reaction kettle containing sodium sulfide and sodium hydroxide liquid, and taking out a softened material after cooking is completed. And (4) pulping and papermaking: washing the boiled softened material to be neutral, and then pulping and papermaking to prepare paper. According to the method, the cooking temperature is controlled through a sulfate cooking method, resource reutilization of waste in the vineyard is achieved, and the method has important significance in promoting healthy and sustainable development of the grape and wine industry.

The invention discloses a green synthesis method of 4, 6-dimethoxy-2-(methylthio) pyrimidine, which comprises the following steps of: synthesizing 4, 6-dimethoxy-2-(methylthio) pyrimidine; according to the method, 4, 6-dihydroxypyrimidine-2-sodium sulfide is taken as a raw material, low-toxicity and harmless dimethyl carbonate is taken as a methylation reagent, lewis acid is added to serve as a catalyst, a reaction is performed in a phase transfer catalyst, and a 4, 6-dimethoxy-2-methylthio pyrimidine solid is prepared. The synthesis method disclosed by the invention has the advantages of cheap raw materials, simple synthesis method and high yield, toxic and harmful reagents in a fractional step method are avoided, the used phase transfer catalyst can be recycled and reused, and the synthesis method is suitable for commercial production.

The invention discloses a method for preparing high-purity lithium sulfide based on a solution double decomposition method, and belongs to the technical field of battery materials, and the method comprises the following steps: adding lithium chloride and sodium sulfide into ethanol, mixing, and reacting in the mixing process to generate lithium sulfide; performing solid-liquid separation on the reaction system to obtain a solid product; washing the solid product with tetrahydrofuran and drying; and continuously introducing inert gas into the heat treatment chamber to purge a solid product in the heat treatment chamber, carrying out heat treatment on the solid product under the conditions of 200-300 DEG C and 10-1000 Pa, and removing complex impurities in the solid product to obtain the high-purity lithium sulfide. Compared with the prior art, the method has the advantages that the Li2S.EtOH impurity in the lithium sulfide is removed, the lithium carbonate impurity generated by the reaction of the impurity at high temperature is reduced, and the risk of electrolyte and battery performance is further reduced.

The invention relates to the field of hydrometallurgy, and particularly discloses a technological method for extracting antimony from antimony sulfide through a wet method. A process method for wet extraction of antimony from antimony sulfide comprises the following steps: S1, mixing an antimony sulfide-containing material with a tetrafluoroborate ionic liquid, and adding water for slurrying to obtain ore pulp; s2, the ore pulp is added into a leaching tank with a two-way reaction structure, and leaching treatment is conducted under the nitrogen protection atmosphere; the lower part in the leaching tank is an ore pulp phase; during leaching, sodium sulfide, sodium hydroxide, modified chitosan microspheres and a catalyst are added into an ore pulp phase; s3, the organic phase obtained after leaching treatment is completed is eluted and filtered, and an antimony-containing solution is obtained; and S4, the antimony-containing solution is fed into an electrolytic bath to be subjected to electrodeposition treatment, and antimony is collected. By means of the method, the antimony leaching efficiency can be improved, and then the antimony recovery rate can be improved.

The preparation process comprises the following steps: connecting an aluminum alloy with an anode of a micro-arc oxidation alternating current power supply, and immersing the aluminum alloy in an electrolytic solution in a stainless steel electrolytic bath; the stainless steel electrolytic bath is connected with a cathode of the micro-arc oxidation alternating current power supply; the surface of the aluminum alloy is subjected to micro-arc oxidation treatment, and an Al2O3 / MoS2 / CePO4 composite ceramic film layer is constructed on the surface of the aluminum alloy in situ; wherein the electrolytic solution comprises a solvent, which is deionized water; the solute comprises the following components in parts by mass in each liter of solvent: 15 parts of sodium hexametaphosphate, 10 parts of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 5 parts of sodium molybdate, 10 parts of sodium sulfide and 5-12.5 parts of cerium acetate. According to the preparation process of the high-wear-resistance and high-corrosion-resistance micro-arc oxidation composite film layer, the high-wear-resistance and high-corrosion-resistance composite ceramic film layer is constructed on the surface of the aluminum alloy in situ, and the wear resistance and the corrosion resistance of the surface of the aluminum alloy are improved.

The invention relates to the related technical field of crushing machinery, discloses a crushing machine for large-block materials after sodium sulfide calcination and a crushing process of the crushing machine, and aims to solve the problem that sodium sulfide which does not conform to the particle size is accumulated on a filter plate. The rotating power generated by the driving crushing roller can drive the filter plate to swing up and down in a fan shape, so that large-particle sodium sulfide filtered by the filter plate is thrown upwards, passes through the material returning cavity part and the material screening cavity part and finally returns to the space between the driving crushing roller and the driven crushing roller again for secondary crushing, accumulation of sodium sulfide on the filter plate is reduced, and the service life of the sodium sulfide is prolonged. The sodium sulfide filtered by the filter plate is subjected to secondary crushing treatment, so that the particle size of the output sodium sulfide meets the actual production requirement, and finally, the effects of throwing and returning the material by the filter plate and realizing secondary crushing are achieved.

The invention relates to the field of silane coupling agents, and discloses a preparation method of a sulfur-containing silane coupling agent, which comprises the following steps: step 1, mixing alkali metal sulfide with sulfur, stirring, and reacting to obtain a sodium polysulfide solution; step 2, adding a pH regulator, a hydrolysis inhibitor and a phase transfer catalyst into the sodium polysulfide solution, dropwise adding 3-halogen propyl trialkoxysilane, and stirring for condensation reaction to obtain a crude product reaction solution; 3, the crude product reaction liquid is sequentially subjected to distillation, decolorization with a decolorizing agent and filtration, and the sulfur-containing silane coupling agent is prepared after the steps are completed. The crystal water contained in the raw materials is used as a reaction medium, so that additional addition of an organic solvent and pre-drying and dehydration treatment are not needed, the spontaneous combustion risk of sodium sulfide is avoided, raw material pretreatment and solvent recovery procedures are omitted, and the whole technological process is simplified, so that the operation is simple and convenient, and the cost is low. The method is suitable for large-scale industrial production.

The invention provides a process for preparing high-purity lithium sulfide through layer interface induction strengthening, which comprises the following steps: dissolving lithium chloride and sodium sulfide in N-methyl pyrrolidone, and stirring to form uniform slurry; pumping the obtained slurry into a fixed bed reactor filled with a molybdenum disulfide catalyst layered module, and reacting to obtain turbid liquid; performing temperature-controlled crystallization on the turbid liquid, filtering and separating to obtain sodium chloride crystals; performing reduced pressure distillation on the filtrate to obtain a lithium sulfide crude product; and dissolving the lithium sulfide crude product in absolute ethyl alcohol for washing, and carrying out suction filtration and drying to obtain lithium sulfide. According to the method disclosed by the invention, fixed bed catalytic reaction and programmed cooling crystallization separation are integrated, and process parameters are optimized, so that the core pain points of high energy consumption, poor safety, difficulty in separation, easiness in catalyst deactivation and the like in a traditional method are successfully solved; a green closed loop of the whole process flow is realized, and a reliable technical path is provided for industrial production of the high-performance lithium sulfide material.

The invention relates to a nano bismuth agent for preventing and / or treating gastritis infection as well as a preparation method and application thereof, the preparation method comprises the following steps: respectively dissolving soluble bismuth salt and a sulfur-containing compound, mixing, and reacting to obtain the nano bismuth agent after the reaction is finished, the sulfur-containing compound is any one or a combination of at least two of thioamino acid, vitamin B1, thioacetamide, sodium sulfide, sodium thiosulfate, bovine serum albumin, whey protein, ovalbumin or metallothionein. The prepared nano bismuth agent has efficient antibacterial performance, shows an excellent curative effect which is two orders of magnitude higher than that of an existing bismuth complex on clinically separated drug-resistant helicobacter pylori, and does not further induce increase of drug resistance of the helicobacter pylori.

The invention discloses a modification method of end-group-modified polyphenylene sulfide, which comprises the following steps: mixing polyphenylene sulfide prepared by a sodium sulfide method, an organic solvent, a sulfydryl modifier and an organic tin catalyst, and reacting for 1-4 hours at the temperature of 200-300 DEG C to obtain the end-group-modified polyphenylene sulfide, the chemical structural formula of the end group modified polyphenylene sulfide is shown as a formula I, wherein n is greater than 0. According to the invention, isocyanate and a terminal group react under the catalysis of dibutyltin dilaurate to generate thiocarbamate, and the terminal group of polyphenylene sulfide is accurately regulated and modified from the molecular level, so that the solution fluidity of polyphenylene sulfide is improved, and the processability is obviously improved.