524 results about "Sulfite" patented technology

The invention relates to the technical field of oilfield chemistry, and discloses a graft modified cellulose filtrate reducer and a preparation method thereof.The preparation method comprises the following steps that modified hydroxyethyl cellulose, 2-acrylamide-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, alkenylated cardanol and N, N '-methylene bisacrylamide are added into deionized water, stirring is conducted, and a mixture is obtained; the preparation method comprises the following steps: adding cellulose into a reaction kettle, stirring for 10-15 minutes at the temperature of 40-60 DEG C at the speed of 300-400 rpm, dropwise adding ammonium persulfate and sodium hydrogen sulfite into a system, and continuously reacting for 4-6 hours to obtain the grafted modified cellulose filtrate reducer. The filtrate reducer disclosed by the invention has good high temperature resistance and salt resistance.

The invention provides a system and a method for treating coexisting new pollutants in drinking water, and the system and the method are characterized in that firstly, ozone microbubble water with small volume and large specific surface area and magnetized superfine activated carbon are used for carrying out oxidation treatment on the coexisting new pollutants and adsorbing pollutants with small molecular weight and relatively high activity; the purpose of removing part of new pollutants is achieved; then, under the irradiation of an ultraviolet lamp tube, the reducing agent catalyzes sulfite to generate reducing free radicals such as hydration electrons [eaq-],. H and SO3., and under the substitution action of iodide ions, reductive dehalogenation and iodine substitution reaction of the halogenated organic matter difficult to degrade are achieved, and reduction removal of new pollutants difficult to degrade is achieved. The system is simple and compact in structure, is a treatment device integrating filtration, oxidation, adsorption and reduction, reduces the occupied area, can realize effective removal of coexisting new pollutants with different molecular characteristics and different reaction activities through multiple actions of physical interception, oxidation, adsorption, reduction and the like, and has a wide application prospect.

The invention belongs to the technical field of biology, and particularly relates to a reagent combination and a kit for extracting nucleic acid through a paramagnetic particle method and application of the reagent combination and the kit. The reagent combination or the kit does not adopt beta-mercaptoethanol with pungent smell or dithiothreitol needing to be stored at low temperature as an antioxidant, but adopts tris (2-formylethyl) phosphine hydrochloride and / or metabisulfite as an antioxidant, belongs to common salt chemical reagent powder, can be stored at normal temperature, and can be used for preparing a reagent for the first time. Manual addition by experimenters before an experiment is not needed, so that nucleic acid (RNA) released by splitting decomposition can be effectively prevented from being oxidized and denatured, and the integrity of extracted nucleic acid (total RNA) fragments is ensured; especially, the metabisulfite is commonly used in food additives, does not cause harm to the body, and is non-toxic and non-volatile.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of ethylene sulfate and derivatives thereof, which comprises the following steps: S1, taking an aprotic solvent as a reaction solvent, adding urea peroxide, and stirring until the urea peroxide is dissolved; s2, dropwise adding ethylene sulfite or an ethylene sulfite derivative, stirring for reaction, and purifying to obtain ethylene sulfate or an ethylene sulfate derivative; the method has the advantages of reducing the catalyst cost and reducing the wastewater amount.

The invention discloses a high-efficiency purification process for removing COD (Chemical Oxygen Demand) of desulfurization wastewater by an electrocatalytic oxidation method, and relates to the technical field of environmental protection, and the high-efficiency purification process comprises the following steps: reducing initial COD of wastewater through sulfite oxidation pretreatment, removing heavy metal ions through heavy metal chemical precipitation, and degrading organic matters through electrocatalytic oxidation advanced treatment. Ozone is used for synergistically strengthening and realizing cyclic utilization of oxygen resources; according to the method, the current density of electrocatalytic oxidation is dynamically regulated and controlled, a matching section group is determined by constructing a current density-COD change curve, dividing sections and constructing a section matching model, then a current density group is constructed, a benefit stable value and an efficient judgment value are obtained through quantitative analysis, and the optimal current density is determined; and an electrode prediction model is constructed to predict the expected service life of the electrode by using a long-short-term memory network algorithm. The desulfurization wastewater OD can be efficiently purified, the current density is optimized, and the service life of the electrode is predicted.

The invention relates to a non-aqueous electrolyte and a lithium secondary battery. In order to solve the problems of poor cycle performance, high impedance and serious gas production of a lithium secondary battery, the invention provides a non-aqueous electrolyte, the non-aqueous electrolyte comprises an organic solvent, a lithium salt and additives, the additives comprise a first additive, a second additive and a third additive, the first additive is selected from one or more of compounds shown in a formula I, and the third additive is selected from one or more of compounds shown in a formula II; the formula I is # imgabs0; the second additive is selected from a compound shown in a formula II and / or a formula III; the formula II is # imgabs 1 #, the formula III is # imgabs 2 #, and the third additive is selected from one or more of double-bond-containing cyclic carbonate, halogen-containing cyclic carbonate, sulfonate, sulfate, sulfite, anhydride, a benzene compound, a fluorobenzene compound, a nitrile compound, phosphate, phosphite, a boron compound, an amine compound, a silicon-containing compound and a heterocyclic compound. Through the synergistic effect of the three additives, the cycle performance of the battery is improved, the impedance of the battery is reduced, and the gas production of the battery is reduced.

The invention discloses a method for comprehensively treating zinc-containing sulfuric acid slag and blast furnace cloth bag ash, which comprises the following steps of: uniformly mixing the zinc-containing sulfuric acid slag, the blast furnace cloth bag ash, a calcium additive and a carbonaceous reducing agent according to the weight ratio of 10: (3-5): (2.5-4): (1.5-3); smoke dust generated by roasting is subjected to oxidation dust removal, cooling separation and desulfurization treatment, and zinc-containing oxide, sulfuric acid and sulfite are obtained; and cooling the roasted material with water, crushing and grinding, and sequentially carrying out high-intensity magnetic separation and low-intensity magnetic separation to obtain high-valued reduced iron powder. The final iron grade can reach 95% or above, and the content of sulfur and zinc is lower than 0.1%. According to the method, the industrial solid waste sulfuric acid slag and the blast furnace cloth bag ash can be converted into the high-valued reduced iron powder, comprehensive recycling of resources is achieved, and environmental and soil pollution caused by stacking is avoided.

To provide a composition for oil or gas well formation, and a method of producing the composition, and a method of forming an oil or gas well.SOLUTION: Provided is a composition for an oil or gas well formation, containing a viscoelastic surfactant and a modified nanomaterial. The modified nanomaterial optionally contains a nanocellulose. The modified nanomaterial optionally has, on its surface, a sulfate group, a sulfite group, a carboxy group, an ethylene oxide chain, an amino group, an ester group, a silane group, a tertiary ammonium group or a mixture thereof.SELECTED DRAWING: None

The invention discloses a method for passivating soil arsenic by using a ferrous sulfide and sulfite conjugate, and belongs to the technical field of soil pollution remediation. The method is carried out in a heterogeneous system, a ubiquitous sulfur conversion intermediate product sulfite (SO32-) is taken as a research object, and a passivation mechanism of the sulfite to trivalent arsenic (As (III)) after the sulfite is coupled with ferrous sulfide is researched. The kinetic process of oxidizing and passivating As (III) under the coexistence of FeS and sulfite is analyzed, and after As (III) is oxidized into pentavalent arsenic (As (V)) in the process, the pentavalent arsenic (As (V)) is adsorbed and passivated on the surface of FeS, so that the removal of total arsenic in the soil is realized. As (V) mainly exists in a form of forming coprecipitation with Fe ions on the surface of FeS, the passivation long-term effect is relatively good, and the As (V) is not easily activated again. Therefore, a new thought is provided for research and development of farmland soil arsenic pollution control measures, and wide application prospects are shown.

The invention discloses a preparation method of sodium polyacrylate, which belongs to the technical field of food processing, and comprises the following steps: weighing a certain amount of acrylic acid, diluting with deionized water, adding into a multi-neck flask, preparing a NaOH solution with a certain concentration, stirring, adding into the flask until a neutralization reaction is completed to obtain a sodium acrylate solution, and adding the sodium acrylate solution into a reaction kettle for reaction; taking a certain amount of activated carbon for adsorption treatment, carrying out suction filtration to obtain a sodium acrylate refined solution, and repeatedly vacuumizing for multiple times; according to the method, on the basis of a redox initiator (ammonium persulfate-sodium hydrogen sulfite), a high-efficiency chain extender dimethylaminopropionitrile is added to form a composite initiation system, and the influence of the addition amount of the composite initiator, the monomer concentration, the reaction time and the reaction temperature on the viscosity of the prepared sodium polyacrylate is discussed respectively. Then, optimal preparation process conditions are determined through an orthogonal test, and the performance of the prepared sodium polyacrylate is measured, so that the practical application effect of the whole method is greatly improved.

The invention provides a dimethyl sulfone extraction device and method, and relates to the technical field of dimethyl sulfone preparation. The dimethyl sulfone extraction device comprises a mixing box, a first feeding hopper and a second feeding hopper; the blocking mechanism comprises sliding columns arranged on the side walls of the two ends of the fixed box in a sliding mode, a sealing plate arranged at the ends, away from the fixed box, of the sliding columns, and a driving assembly arranged in the fixed box and used for driving the two sliding columns to move in the same direction so as to intermittently block discharging ports of the first feeding hopper and the second feeding hopper. The wall scraping mechanism can scrape off part of crystals attached to the surfaces of the stirring blades while the stirring blades rotate. According to the invention, sulfite and methanol can be intermittently put into the mixing box in sequence, so that the sulfite and the methanol are doped together to improve the reaction speed of a solution, and part of crystals which are separated out and attached to the surfaces of the stirring blades can be scraped off while the stirring blades rotate; the solution can react thoroughly, and resource waste caused by the fact that crystals cannot be collected subsequently can be avoided.

The preparation method comprises the following steps: adding a sodium hydrogen sulfite aqueous solution and a catalyst into a reaction container, heating, dropwise adding resorcinol diglycidyl ether after the temperature reaches a set value, titrating with an iodine standard solution until the content of sodium hydrogen sulfite is basically unchanged, and ending the reaction. And carrying out reduced pressure suction filtration on the reaction solution to obtain a product, washing the product with ethyl acetate and ethanol, removing resorcinol diglycidyl ether, drying to obtain a crude product, dissolving the crude product in a hydrochloric acid solution, heating in a constant temperature water bath, evaporating SO2, continuously adding a NaOH alcoholic solution, adjusting the pH to alkalescence, filtering to obtain a solid, and drying to obtain the resorcinol diglycidyl ether. According to the invention, sodium hydrogen sulfite and epoxy are subjected to ring-opening reaction to generate the novel hydrophilic chain extender with hydroxyl and sulfonic acid functional groups. Compared with a traditional production mode, the method is simple in reaction condition, rapid in reaction and high in conversion rate, and has a great prospect in hydrophilic chain extension application.

The invention discloses a method for preparing erythritol bicyclic ethylene sulfate through efficient catalysis, which comprises the following steps: reprocessing a commercially available titanium silicalite molecular sieve, and reacting intermediate erythritol bicyclic ethylene sulfite (BES) and hydrogen peroxide under the action of a self-made catalyst to obtain the target product erythritol bicyclic ethylene sulfate (BDTD), the yield is 88%; and the obtained product is recrystallized to obtain the product with the purity of more than 99.5%, and the solvent and the catalyst used in the process can be recycled. The raw materials and auxiliary materials are commercially available, low in price and easy to obtain, the reaction yield is high, the product purity is high, the process cost is low, and the method is environmentally friendly, suitable for industrialization and extremely high in social use value and application prospect.

The invention relates to the technical field of sewage treatment, in particular to a metal sulfide nanoparticle slow-release activator for sewage treatment and a preparation method of the metal sulfide nanoparticle slow-release activator for sewage treatment. The surface of the core layer is coated with the porous silicon dioxide membrane shell layer; the citric acid modifier is loaded on a core-shell interface; according to the invention, metal sulfide (such as FeS, MoS2, WS2 and the like) micro-nano particles are used as a solid-phase slow-release activator, so that the core problem of a traditional homogeneous activation system is radically solved. Firstly, the metal sulfide exists in the form of a solid phase and can directly contact and react with permanganate without an additional dissolving step, so that the problem of complicated process operation caused by poor solubility of activating agents such as sulfite is thoroughly avoided, and the process of reclaimed water treatment is simplified. The problem of poor continuous oxidation effect of a traditional homogeneous system is thoroughly solved.

The invention provides a control method and device of an oxidation fan, equipment and a storage medium. The method comprises the steps that sulfite to-be-removed amount data and unit operation data of slurry in a previous time period are obtained; based on the to-be-desulfurized sulfite amount data and the unit operation data, the unit operation load and the to-be-desulfurized total amount in the current time period are predicted; determining the working condition level of the current time period based on the unit operation load and the to-be-desulfurized total amount in the current time period; and based on the working condition level of the current time period, the blast volume of the oxidation fan is controlled. According to the method disclosed by the invention, the blast volume of the oxidation fan can be automatically adjusted according to the working condition level of the current time period, so that the power consumption of the oxidation fan can be effectively reduced while the over-discharge risk can be avoided under various working conditions.

The invention belongs to the technical field of fine chemical organic synthesis, and discloses a synthesis method of 1, 3-propane sultone without generation of three wastes. The synthesis method comprises the following steps: by taking allyl alcohol, sulfite and hydrosulfite as raw materials, generating 3-hydroxy propanesulfonate; then removing part of water, adding a solvent A to separate out sulfite, filtering, and adding sulfuric acid into filtrate for acidification; and adding a solvent B to separate out sulfate, filtering and separating out the sulfate, and adding a dehydrating agent to carry out dehydration cyclization reaction to prepare the 1, 3-propane sultone. According to the synthesis method provided by the invention, a 1, 3-propane sultone product with the yield not lower than 95% and the purity reaching 99.9% or above and a sulfate byproduct with the purity reaching 99.6% or above can be obtained; no waste gas, waste solid or waste water is generated in the reaction process, the catalyst sulfite can be repeatedly used, and the used solvent is easy to recover and can be repeatedly used.

The invention discloses a synthesis method of methyl 4-formylbutyrate, and belongs to the technical field of chemical synthesis, methyl acrylate and nitromethane are subjected to a Michael addition reaction under the action of a catalyst to prepare methyl 4-nitrobutyrate, and the excessive undissolved catalyst can be recycled after being filtered; the method comprises the following steps: under the action of sodium tert-butoxide and potassium permanganate, carrying out hydrolytic oxidation reaction on methyl 4-nitrobutyrate, adding a sodium hydrogen sulfite aqueous solution and a sulfuric acid solution after the reaction is completed, consuming excessive potassium permanganate oxidant, reducing by-products, and carrying out purification treatment to obtain high-purity methyl 4-formyl butyrate. The synthesis method provided by the invention has the advantages of cheap and easily available raw materials, simple operation, easily controllable conditions, high total yield and easy realization of industrial production.

The invention belongs to the technical field of battery materials, and particularly relates to a lithium ion battery electrolyte containing a cyano sulfonamide compound and a lithium ion secondary battery, the lithium ion battery electrolyte containing the cyano sulfonamide compound comprises an organic solvent, a lithium salt and an additive, the additive comprises at least one substance of fluoroethylene carbonate, ethylene sulfate, ethylene sulfite, 1, 3-propane sultone, 1, 3-propenyl sultone, vinylene carbonate and vinylethylene carbonate, and a cyano sulfonamide compound, and the additive comprises at least one substance of fluoroethylene carbonate, ethylene sulfate, ethylene sulfite, 1, 3-propane sultone, 1, 3-propenyl sultone, vinylene carbonate and vinylethylene carbonate; the invention relates to a lithium ion secondary battery which comprises a battery cell, a battery shell and electrolyte, the electrolyte additive, the organic solvent and the lithium salt of specific types are matched, so that the cycle performance of the lithium ion battery under high voltage can be effectively improved, and the lithium ion battery prepared from the lithium ion battery electrolyte has excellent cycle performance under high voltage.

The invention discloses a composition for improving the stability of 4-butylresorcinol, application of the composition and an external skin preparation, and belongs to the technical field of cosmetics. The composition is prepared from the following components in parts by weight: 0.01 to 5 parts of 4-butyl resorcinol, 0.005 to 0.195 part of sodium pyrosulfite, 0.005 to 0.195 part of sodium hydrogen sulfite, 0.005 to 3 parts of ergothioneine and 0.003 to 0.2 part of troxerutin. The composition can maintain the 4-butylresorcinol not to change color for a long time, and especially can maintain the original color under the conditions of ultraviolet irradiation and light irradiation for 3 months. The composition is used for preparing the external skin preparation, so that the external skin preparation also has better color stability, and the product quality of the external skin preparation is improved.

The invention discloses an intelligent monitoring system of a desulfurization absorption tower, which relates to the technical field of desulfurization absorption tower monitoring and comprises a data acquisition unit, an operation analysis unit, a desulfurization analysis unit, a comprehensive analysis unit and an abnormal alarm unit, through comprehensive evaluation of the pH value, chloride ion concentration and sulfite concentration of the slurry, desulfurization reaction effectiveness can be quantified, and dynamic adjustment of limestone dosage can be guided, so that desulfurization process parameters are optimized, the service life of the slurry is prolonged, and by fusing a stable operation index, a desulfurization reaction index and sulfur dioxide absorption data, the desulfurization efficiency is improved. The comprehensive absorption index model of the desulfurization absorption tower is constructed, global evaluation of the desulfurization efficiency is realized, the accuracy of the monitoring result is improved, the limitation of traditional single index evaluation is avoided through multi-factor correlation analysis, and finally, through the real-time early warning function of the abnormity alarm unit, the safety of the desulfurization absorption tower is improved. When the desulfurization system is unstable in operation or low in absorption efficiency, a worker can be quickly notified to intervene.

The invention relates to a desulfurization slurry sulfite monitoring system and monitoring method. The monitoring system comprises a sample extraction device, a developing pool, a detection device, a liquid storage device and a control center, a light source, a sample pool and a detector are arranged in the detection device, and light emitted by the light source penetrates through a solution in the sample pool to reach the detector; the control center is in communication connection with the detector; desulfurization slurry is added into the sample extraction device, an extracting solution in the liquid storage device is added into the sample extraction device and the color developing pool, a shielding agent, a reaction solution and a color developing solution are added into the color developing pool, and the detector transmits absorption spectrum information to the control center. Compared with the prior art, the method has the advantages that the sulfite is fixed by the extracting solution, the measurement error caused by slurry oxidation is reduced, the content of the sulfite in the slurry is measured by adopting a spectrophotometric method after the sulfite reacts with the color developing agent, a measurement result can be directly obtained, characterization through a parameter relation is not needed, the operation is convenient, and the accuracy is high. And the measurement accuracy is high.

The present invention discloses a large-particle multi-level pore TS-1 molecular sieve for catalytic oxidation reaction in the field of molecular sieve catalytic materials, and its preparation method and use. When preparing the TS-1 molecular sieve, a silicon source, a titanium source, a template, a seed crystal and water are used to form a mixed dispersion, and a one-step hydrothermal crystallization is adopted. After filtering, washing, drying and roasting, a large-particle multi-level pore TS-1 molecular sieve is obtained. The molecular sieve has a cross-shaped long strip, a particle size of 6 to 10 μm, and a specific surface area of ​​≥370 m 2 / g, pore volume ≥0.4ml / g, average pore size 2-3nm. The present invention provides a large-particle multi-level pore TS-1 molecular sieve with excellent catalytic activity and stability, which can be used in the reaction of oxidizing vinyl sulfite to vinyl sulfate using dichloromethane as solvent and hydrogen peroxide as oxidant, has a long service life, is easy to recycle, has good product selectivity and high conversion rate.

The invention discloses a method for high-selectivity synthesis of ethylene sulfate from ethylene sulfite. An organosilane functional group is introduced to the surface of a TS-1 molecular sieve, the hydrophilic and hydrophobic degree of TS-1 is regulated and controlled, water is effectively prevented from being enriched around TS-1, and DTD hydrolysis side reaction is reduced, so that the stability and oxidation performance of the catalyst are improved, and the dispersity of TS-1 in a system is improved. The TS-1 treated by octadecyl trichlorosilane has moderate-strength hydrophobicity, so that the adsorption of substrates ES and H2O2 on the surface of the catalyst can be ensured, the aggregation of H2O molecules on the surface can be reduced, and the hydrolysis of DTD on the surface of the catalyst is inhibited. When the modified TS-1 molecular sieve catalyzes an ES oxidation reaction, DTD selectivity can reach 95% or above, and the modified TS-1 molecular sieve has good stability and reusability. The method is simple to operate, low in cost and suitable for large-scale industrial production.

The invention belongs to the technical field of scale inhibitors, and particularly relates to a slow-release scale inhibitor and a preparation method thereof.The preparation method comprises the steps that 3, 4, 5-allyl trihydroxybenzoate, itaconic acid, sodium hydrogen sulfite, methacryloyloxyethyl-n-hexadecyl-dimethyl ammonium bromide and deionized water are mixed, after water bath heating, an ammonium persulfate aqueous solution is slowly added, and the scale inhibitor is obtained after reaction; the preparation method comprises the following steps: dissolving agar in deionized water, adding polyethylene glycol modified sodium alginate and a scale inhibitor into the deionized water, stirring, dropwise adding into edible oil to obtain gel microspheres, adding the gel microspheres into a calcium chloride aqueous solution, slowly stirring, cross-linking, cleaning and drying to obtain the slow-release scale inhibitor. The hydrogel microspheres swell to slowly release the scale inhibitor, meanwhile, the released scale inhibitor is hydrolyzed in water, ester groups are slowly broken, polycarboxylic acid, 3, 4, 5-trihydroxybenzoic acid and hydroxyethyl-n-hexadecyl-dimethyl ammonium bromide are slowly released, and good scale inhibition and corrosion inhibition effects are achieved.

The invention discloses a method for preparing vinyl sulfate by continuously oxidizing vinyl sulfite. In a fixed bed reactor, vinyl sulfite is used as a raw material and hydrogen peroxide is used as an oxidant. Under the condition of continuous introduction of carrier gas at 5-100°C, a high conversion rate of 98% of the raw material and a product selectivity of 88% are achieved. The catalyst is not deactivated after 300 hours of reaction and has good stability. The invention removes the reaction product in time and reduces product hydrolysis by continuously introducing carrier gas into the fixed bed reactor, thereby improving product selectivity. The fixed bed reactor is adopted to solve the problems of complex operation of intermittent reactors, difficult catalyst separation, discontinuous reaction, etc. The method for continuously preparing vinyl sulfate provided by the invention is simple, efficient, and has low energy consumption. The cheap titanium silicon molecular sieve reduces the reaction cost and is easy to industrialize, providing a new route for the efficient and green conversion of vinyl sulfite to prepare vinyl sulfate.

The invention discloses a preparation method and application of lignin, and relates to the technical field of preparation of natural organic compounds. The preparation method comprises the following steps: mixing a plant raw material containing lignin with a solution containing sulfurous acid and / or sulfite, reacting at the temperature of 100-180 DEG C under the pressure of 0.4-0.8 MPa, and performing solid-liquid separation to obtain lignin filtrate. The lignin and cellulose obtained through the preparation method are easy to separate, the lignin content in the lignin filtrate is high, the lignin filtrate is applied to zinc smelting oxygen pressure leaching, commercially available lignin can be completely replaced, the proportion of flotation tailings cannot be increased, sulfur recovery is more facilitated, and the TOC content and the chloride ion content of the oxygen pressure leaching liquid can be reduced.

The invention provides a method for preparing high-purity acrylate by removing trace impurity aldehyde, which comprises the following steps: mixing crude acrylate with a polymerization inhibitor to form an organic phase; adding an aqueous solution of a dealdehyding agent into the organic phase to form an oil-water two-phase system; the oil-water two-phase system is forcibly stirred for 0.1-2.0 hours at the temperature of 20-40 DEG C, so that the impurity aldehyde and the dealdehyding agent are subjected to nucleophilic addition reaction, and a generated aldehyde-dealdehyding agent addition product is dissolved in a water phase; standing and layering the reacted material, separating and removing a water phase to obtain an organic phase without impurities; carrying out reduced pressure rectification on the organic phase after impurity removal to obtain a high-purity acrylate product with the total aldehyde content lower than 50ppm; wherein the aldehyde removing agent is sodium hydrogen sulfite, potassium hydrogen sulfite, calcium hydrogen sulfite, ammonium hydrogen sulfite or a mixture of any two or more of the sodium hydrogen sulfite, the potassium hydrogen sulfite, the calcium hydrogen sulfite and the ammonium hydrogen sulfite. The method is efficient, economical, free of solid deposition and easy for industrial continuous operation.

In one aspect, a preparation method of iron phosphate includes: mixing pyrite cinder and an sulfite evenly in water to obtain a first mixed system; adding phosphoric acid and a buffer to the first mixed system to perform a leaching reaction; performing a first solid-liquid separation on a slurry obtained from the leaching reaction to obtain a first filtrate and a first residue; introducing air into the first filtrate and then performing a first stirring reaction on the first filtrate; performing a second solid-liquid separation on a slurry obtained from the first stirring reaction to obtain a second filtrate and a second residue; and calcining the second residue to obtain iron phosphate.

The invention discloses a non-aqueous electrolyte for a sodium ion battery. The non-aqueous electrolyte comprises the following components in parts by weight: 70-85 parts of an organic solvent, 10-20 parts of an electrolyte, 0.5-5 parts of a first film-forming additive and 0.5-5 parts of a second film-forming additive, the first film-forming additive is selected from any one or more of 1, 3-propene sultone, 1, 3-propane sultone, methylene methanedisulfonate and 1, 4-butane sultone, and the second film-forming additive is selected from any one or more of 1, 3-propene sultone, 1, 3-propane sultone, methylene methanedisulfonate and 1, 4-butane sultone; the second film-forming additive is selected from any one or more of fluoroethylene carbonate, vinylene carbonate, ethylene sulfate, vinylene sulfate and ethylene sulfite; the electrolyte is composed of sodium hexafluorophosphate, sodium bis (oxalato) borate, sodium bis (fluorosulfonyl) imide and sodium tetrafluoroborate according to the weight ratio of (14-24): (0-1): (0-1): (0-1). By adding the first film-forming additive and the second film-forming additive, the battery film formation is facilitated, the cycle performance is improved, the service life of the sodium battery can be more effectively prolonged, and the sodium battery can be better applied to the fields of energy storage, low-speed vehicles and passenger vehicles.

The invention discloses low-loss superfine soft magnetic alloy powder and a manufacturing method and application thereof, belongs to the technical field of soft magnetic materials, and particularly relates to a method for preparing superfine alloy powder by smelting iron, nickel, manganese, aluminum, silicon and chromium into alloy and adopting an evaporation condensation method. Then coating the surface of the superfine alloy powder with a phosphating film by using a medium-temperature zinc-manganese phosphating solution and a phosphating auxiliary agent, and then coating with a silicon dioxide layer to obtain coated low-loss superfine soft magnetic alloy powder; wherein the phosphating auxiliary agent at least comprises a sodium sulfonate derivative, and in the preparation of the sodium sulfonate derivative, azelaic acid dichloride and 1-octylene-3-alcohol are subjected to a reaction, and then sodium hydrogen sulfite is added for a reaction to obtain the sodium sulfonate derivative. The D50 particle size of the prepared low-loss superfine magnetically soft alloy powder ranges from 100 nm to 3000 nm; the resistivity is high, and the resistivity reaches 9.0 omega.cm or above; and the power loss is low and is lower than 320.3 mW / cm < 3 >, and the method can be used for preparing a high-performance inductor.