321 results about "Iron sulfate" patented technology

The invention discloses a biomass-inorganic-organic ternary composite flocculant and a preparation method and application thereof, and belongs to the field of coking wastewater treatment.The preparation method comprises the steps that chitosan serves as a substrate material, glutaraldehyde serves as a cross-linking agent, and polyferric sulfate (PFS) and chitosan are subjected to chemical cross-linking to generate an intermediate product PFS and chitosan composite particles; then potassium persulfate is used as an initiator, graft copolymerization of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride is initiated through hydroxyl on the surface of PFS-chitosan, a cationic branched chain is introduced, and a final product is obtained. Through multi-component cooperation and structural design, the defects that a traditional flocculating agent is not thorough in demulsification, large in sludge amount, unstable in floc combination and the like in coking wastewater treatment are overcome, and the flocculating agent is particularly suitable for treating oil pollutants in coking wastewater.

The invention discloses a positive electrode material formed by compounding polyanionic sodium ferric sulfate and a layered transition metal oxide, and a preparation method and application thereof, and the preparation method comprises the following steps: preparing a sodium ferric sulfate positive electrode material, preparing a layered transition metal oxide positive electrode material, and mechanically mixing the sodium ferric sulfate and the layered transition metal oxide material, the composite material is obtained. The production process of the two materials is easy for large-scale production, has high similarity with the existing battery industrial equipment, is simple in method for compounding the two materials, and has large-scale industrial application value. The composite material has the stability of a polyanionic material and the high energy density of a layered oxide material, and has more excellent comprehensive electrochemical performance.

The present application relates to the technical field of sodium‑ion batteries, and provides a sodium iron sulfate-based composite positive electrode material, and a preparation method therefor and a use thereof. The sodium iron sulfate-based composite positive electrode material has a porosity of 0.1%-10% and a compacted density of 2.1-3 g / cm3; in addition, the sodium iron sulfate-based composite positive electrode material has a specific surface area of 5-12 m2 / g, and a sodium-rich impurity phase in the sodium iron sulfate-based composite positive electrode material has a mass percentage content of 0.1%-1%. The present application helps to improve the performance of batteries, such as the charge / discharge capacity and the initial coulombic efficiency.

The invention belongs to the technical field of electrochemistry, and particularly provides a lanthanum-cerium double-doped sodium ferric sulfate positive electrode material and a preparation method thereof. The material is composed of a matrix and a carbon coating layer coating the matrix, the matrix has a chemical expression of Na6Fe4-x-yLaxCey (SO4) 7, x is greater than or equal to 0.01 and less than or equal to 0.1, and y is greater than or equal to 0.01 and less than or equal to 0.1. The material is prepared through spray drying and high-temperature sintering treatment in sequence, the particle morphology is regular, and the particle size distribution is uniform; the electronic conductivity and Na < + > diffusion rate of the material are remarkably improved by rare earth doping, so that the material has more excellent low-temperature cycle performance, sodium storage performance and the like.

The invention discloses a carbon-coated sodium ferric sulfate positive electrode material, a preparation method thereof and a battery, and the preparation method comprises the following steps: dissolving anhydrous sodium sulfate and ferrous sulfate heptahydrate in a solvent according to a preset proportion, and adding a preset amount of inorganic carbon dispersion liquid to form a uniform suspension; carrying out spray drying on the turbid liquid to obtain a primary coating precursor; dispersing a conductive carbon black material in the solution to obtain a carbon dispersion liquid; putting the primary coated precursor into an aerial fog coating machine, pumping a carbon dispersion liquid into a nozzle, and coating through two-phase flow injection and collision with primary coated precursor powder to obtain a secondary coated precursor; and sequentially calcining, grinding and screening the precursor to obtain the carbon-coated sodium ferric sulfate positive electrode material. The preparation method disclosed by the invention adopts two common industrial treatment modes of spray drying and fluidization coating for preparation, and has the characteristic of easiness in amplification. The fluidization coating can effectively improve the coating uniformity of the solid-phase inorganic carbon on the particle surface.

The invention discloses a preparation process of berberine hydrochloride, and belongs to the technical field of berberine production. The invention relates to a berberine hydrochloride preparation process, which comprises: S1, mixing a ferric sulfate-aluminum sulfate composite salt, sodium chloride, zinc chloride and anhydrous formic acid, pre-activating, adding N-2, 3-dimethoxybenzyl homopiperony lamine hydrochloride, dropwise adding a glyoxal mixed solution, and carrying out a reflux reaction. And S2, cooling the reaction liquid until a solid is separated out, filtering, adding a filter cake and diatomite into purified water, stirring, adjusting alkali, heating, and continuously stirring for 0.5-1 hour. Cooling and filtering, and reserving filtrate; s3, adjusting the acidity of the filtrate, cooling and growing crystals; and filtering, rinsing a filter cake, and carrying out vacuum drying on the filter cake to obtain berberine hydrochloride. The berberine hydrochloride prepared by the method is high in yield and purity, and the preparation process is safe, short in flow and friendly to human bodies and environment.

The invention belongs to the technical field of positive electrode materials, and particularly relates to an anion-doped sodium ferric sulfate positive electrode material for a sodium ion battery as well as a preparation method and application of the anion-doped sodium ferric sulfate positive electrode material. The invention provides an anion-doped sodium ferric sulfate positive electrode material for a sodium ion battery as an electrode modification material, and the anion-doped sodium ferric sulfate positive electrode material comprises an anion-doped sodium ferric sulfate material with a general formula of Na < 6-2a > Fe (SO4) < 3-b > (BOx) , and is used for preparing a sodium ion battery positive electrode. The material is simple in preparation process, mild in reaction condition, low in cost and relatively high in reaction efficiency, the problems of relatively poor sodium storage capacity, cycle performance and water resistance of a sodium ferric sulfate material under high magnification in the prior art are solved, and the intrinsic conductivity of the sodium ferric sulfate material is remarkably improved; and the sodium-ion battery composite positive electrode material prepared from the composite positive electrode material has excellent rate capability and cycling stability.

The invention discloses an advanced treatment method of tungsten beneficiation wastewater, which is characterized in that a composite flocculant is adopted to flocculate the tungsten beneficiation wastewater, and the composite flocculant is mainly composed of cationic polyacrylamide, a flocculant A and lignocellulose, the flocculant A comprises at least one of polyferric sulfate, polyaluminum chloride, polyaluminum ferric chloride, polyaluminum ferric sulfate, ferric sulfate, ferrous sulfate and aluminum chloride. According to the advanced treatment method for the tungsten beneficiation wastewater, under the action of the composite flocculant, the cost of a treatment agent can be reduced to about 0.16-0.20 yuan / m < 3 >, the cost reduction amplitude is as high as 80% or above, the treatment time can be shortened to be within 10 min, the precipitation time is greatly shortened, meanwhile, suspended solids in the wastewater can be effectively removed, actual production requirements are met, and the method is suitable for industrial production. The method has the advantages of low treatment cost, high treatment efficiency, good removal effect, good adaptability and the like, can realize advanced treatment of the tungsten beneficiation wastewater, and is high in use value and good in application prospect.

The invention relates to the technical field of sodium ion battery positive electrode materials, in particular to a composite sodium ferric sulfate positive electrode material, a sodium ion battery and a preparation method. The preparation method comprises the following steps: preparing a group IIIA metal doped composite sodium ferric sulfate precursor; mixing with a solution containing a sodium source, an iron source and a phosphorus source; and performing staged heat treatment under a protective atmosphere to form a pyrophosphate ferric phosphate sodium coating layer. The particle size D50 of the composite sodium ferric sulfate positive electrode material is 3-5 [mu] m, and the composite sodium ferric sulfate positive electrode material can inhibit iron dissolution and enhance structural stability through bulk phase doping and surface coating cooperation, can prolong the cycle life of a battery and reduce gas production, and is suitable for a high-performance sodium ion battery.

The invention relates to a process for preparing pure iron by using red mud, which is characterized in that the red mud is Bayer process red mud, i.e., solid waste residue formed by solid-liquid separation after aluminum oxide is dissolved out from bauxite through high temperature, high pressure and strong alkali in the process of producing aluminum oxide by adopting a Bayer process, so that the environmental burden caused by the Bayer process red mud can be solved; the method is beneficial for reducing carbon emission in the aspect of iron element extraction and promoting development of a green metallurgical technology, and is characterized by comprising the following steps: taking Bayer process red mud as a raw material, carrying out acid leaching on the Bayer process red mud to obtain a ferrous oxalate extract, calcining the ferrous oxalate to obtain iron oxide, and recycling the iron oxide. And dissolving the ferric oxide into a sulfuric acid solution to obtain a ferric sulfate solution, taking the ferric sulfate solution as an electrolyte in an electrolysis device, and obtaining electrolytic iron through the electrolysis device, so that the pure iron is prepared from the red mud.

The invention relates to the technical field of low-carbon building materials, and particularly discloses a high-strength super-retarding super-sulfate cement material as well as a preparation method and application thereof. The cement material comprises the following raw materials in parts by weight: 75-85 parts of a slag gelling component, 10-20 parts of gypsum, 0.5-5 parts of an alkali activator, 1-5 parts of a composite retarder, 0.35-1 part of a water reducing agent and 0.2-1 part of a defoaming agent. Wherein the composite retarder is prepared from the following components in parts by weight: 2-3 parts of fluosilicate, 8-10 parts of sulphoaluminate cement and ferric sulfate, and the content of the ferric sulfate is 1.2-1.5 times that of the fluosilicate. The composite retarder disclosed by the invention not only has better stability, but also can effectively prolong the setting time of the super-sulfate cement material in a high-temperature environment, and greatly improves the mechanical strength of the super-sulfate cement material in the whole age.

The invention relates to the technical field of knowledge maps, in particular to a ferric sulfate knowledge map construction method based on multi-modal heterogeneous data, which comprises the following steps: acquiring multi-modal heterogeneous data in a ferric sulfate production process; taking a mechanical operation rhythm obtained by analyzing the multi-axis high-frequency vibration signal data as a main time reference to form a public time reference; performing alignment and association on the tomography data and the acoustic emission data based on public time reference to obtain an instantiation process normal form entity in the knowledge graph; analyzing the time sequence of the process normal form entity according to a predefined ontology relationship type, establishing a directed relationship with a state transition probability attribute, and forming a probability state machine data structure traversed by a graph query language in a knowledge graph; filling structured attributes are defined for process normal form entities in the knowledge graph. According to the method, the construction of the ferric sulfate knowledge graph is realized by fusing multi-modal data and state analysis.

The invention provides a composite sodium ferric sulfate positive electrode material and a preparation method thereof, a sodium ion battery positive plate and a sodium ion battery, and relates to the technical field of batteries. According to the preparation method of the composite sodium ferric sulfate positive electrode material, boron is doped in the preparation process of the conductive agent, so that the conductivity of the conductive agent can be improved, and the dosage of the conductive agent is reduced; the conductive agent is added in the preparation process of the positive electrode material, so that the dispersion uniformity of the conductive agent can be improved; through high-temperature sintering, the contact between the conductive agent and the active material is firmer, and the dry-method pole piece prepared from the material has lower pole piece resistance.

The invention discloses a multi-band high-stability ferrite magnetic material composite formula and a preparation process, and relates to the technical field of magnetic materials. The ferrite magnetic material composite formula comprises 38-42 parts of ferric oxide powder, 37-41 parts of ferroferric oxide powder, 6-12 parts of graphene nanosheets, 5-7 parts of hydroxypropyl methyl cellulose, 6-9 parts of lanthanum oxide, 4-6 parts of scandium oxide, 1-3 parts of nano titanium dioxide, 4-6 parts of bismuth magnesium boron, 9-13 parts of ferric sulfate, 3-5 parts of manganese sulfate, 4-6 parts of zinc sulfate, 2-4 parts of copper sulfate and 2-3 parts of samarium sulfate. By utilizing a physical vapor deposition gradient doping process, the problems that an existing ferrite magnetic material is single in electromagnetic performance, cannot stably and efficiently work in a multi-frequency-band complex electromagnetic environment and cannot meet the requirements of the fields of communication, radar, electronic countermeasure and the like for wide-frequency-band and high-performance magnetic materials can be solved.

The invention discloses a method for preparing lithium iron manganese phosphate by obtaining a high-performance precursor from waste lithium iron phosphate. According to the method disclosed by the invention, the chelating effect of phytic acid and ferric ions is utilized, so that an organic carbon source is introduced into hydrated iron phosphate precipitated from the waste lithium iron phosphate leaching solution, the fusion growth of iron phosphate particles is effectively prevented in the subsequent high-temperature roasting process, and the high-performance lithium manganese iron phosphate precursor is obtained from the waste lithium iron phosphate. The method comprises the following steps: dissolving waste lithium iron phosphate powder in a sulfuric acid solution, then adding a small amount of a phytic acid solution and ferric sulfate with a corresponding molar weight, precipitating and calcining at a high temperature to obtain dehydrated iron phosphate (FP-PA) with a limited particle size; when the material is applied to synthesis of a lithium manganese iron phosphate positive electrode material, the particle size of the positive electrode material can be effectively controlled, and the specific capacity and cycle performance of a battery are improved. The method is easy to operate and high in repeatability, and a new way is provided for treating waste lithium iron phosphate with economic benefits and excellent performance.

This invention discloses a rare-earth metal gradient-doped polyanionic cathode material, its preparation method, and its application. The molecular formula of the rare-earth metal gradient-doped polyanionic cathode material is Na. 2+2x‑y RE y Fe 2‑x (SO4)3, in the rare earth metal gradient-doped polyanionic cathode material, rare earth metal elements enter the crystal lattice of the polyanionic cathode material in the form of rare earth metal ions, and the doping content of the rare earth metal ions decreases in a gradient along the direction from the crystal lattice surface to the bulk phase. The polyanionic cathode material is an Alluaudite-type sodium iron sulfate cathode material. This invention effectively solves the kinetic mismatch problem of "fast ions but slow electrons" in rate performance by simultaneously optimizing the electronic structure and sodium ion channels through rare earth doping, significantly improving the structural stability of the material under long-cycle and fast-charge-discharge conditions. Simultaneously, the assembled sodium-ion battery exhibits excellent wide-temperature performance.

The invention discloses a desert steppe grass interspecific synergistic agent and a preparation method and application thereof, and relates to the technical field of synergistic agents, the synergistic agent comprises the following raw materials by weight: 30-40 parts of modified cyanobacteria charcoal, 10-15 parts of a microbial fertilizer, 20-30 parts of an organic fertilizer, 10-20 parts of an inorganic fertilizer, 1-2 parts of a plant growth regulator, and 2-5 parts of a water-retaining agent; the modified blue-green algae charcoal is prepared from the following raw materials in parts by weight: 15-30 parts of ferrous sulfate heptahydrate, 15-30 parts of ferric sulfate hydrate, 200-400 parts of water and 10-20 parts of blue-green algae powder. The synergist provided by the invention can effectively improve the growth efficiency of desert grassland grass planting and effectively improve the treatment effect of degraded grassland.

This invention relates to the field of industrial wastewater treatment technology, specifically a highly efficient treatment method for methionine wastewater, comprising the following steps: Step 1: pH adjustment, adjusting the pH of the methionine wastewater to 6.0-7.0; Step 2: Polyferric sulfate coagulation and sedimentation, adding polyferric sulfate and polyacrylamide to the pH-adjusted wastewater; Step 3: Pre-stage ozone oxidation, passing the supernatant obtained in Step 2 through ozone-containing gas for oxidation treatment; Step 4: Biochemical treatment, subjecting the effluent from Step 3 to a biochemical reaction, sequentially passing through anoxic and aerobic stages; Step 5: Post-stage ozone oxidation, passing the biochemical effluent obtained in Step 4 again through ozone-containing gas for deep oxidation treatment; Step 6: Activated carbon adsorption. The methionine wastewater treated by this invention can significantly reduce TOC concentration and improve COD removal rate. The pH pre-adjustment step effectively reduces the quenching effect of alkalinity on hydroxyl radicals, ensuring the efficiency of subsequent advanced oxidation processes.

This invention provides a method for removing impurities and recovering nickel anolyte from electrolytic nickel. The method includes the following steps: (1) mixing the electrolytic nickel anolyte with liquid alkali, separating the solid and liquid components to obtain nickel hydroxide and filtrate, evaporating the filtrate to obtain sodium sulfate; mixing the electrolytic nickel anolyte with a nickel source to obtain a mixed solution; (2) mixing the mixed solution with barium salt for lead removal; (3) adjusting the pH of the material obtained after lead removal with nickel hydroxide to obtain an arsenic removal solution, mixing the arsenic removal solution with polyferric sulfate for arsenic removal; (4) mixing the material obtained after arsenic removal with an oxidant to obtain an iron removal solution, performing solid-liquid separation on the iron removal solution to obtain lead-, arsenic-, and iron-removed cathode liquid and iron-containing slag, adding sodium sulfate to the lead-, arsenic-, and iron-removed cathode liquid, and reusing it in the electrolytic nickel process. The method of this invention can efficiently and quickly remove lead, arsenic, and iron from electrolytic nickel anolyte and reuse it.

The invention discloses a defluorination agent suitable for defluorination of electronic industrial wastewater as well as a preparation method and a defluorination method of the defluorination agent. The defluorination agent comprises 9-10 wt% of aluminum salt, 0.1-0.2 wt% of ferric salt, 0.6-1.1 wt% of an alkaline regulator and the balance of water, the aluminum salt is selected from one or more of polyaluminum chloride and aluminum sulfate, and the ferric salt is selected from one or more of ferric trichloride, ferric sulfate and polyferric sulfate. The fluorine removal agent provided by the invention can realize that the fluorine concentration of discharged water is lower than 1mg / L through one-stage / two-stage fluorine removal under a low-fluorine, medium-fluorine or high-fluorine water inlet condition, the optimal pH condition of reaction is reduced, the acid-base and agent use cost is saved, and meanwhile, the fluorine removal agent is simple in preparation method and can be applied to large-scale popularization and production.

Provided is a novel method for producing an adsorbent comprising an iron compound and having a large adsorption capacity. An adsorbent having a specific surface area of 200 m2 / g or more, a primary particle size of 10 nm or less, an iron content of 450 g / kg or more, and a moisture content of 100 g / kg to 300 g / kg can be obtained by the method for producing an adsorbent, the method including: a first step for adding a polyferric sulfate aqueous solution to an alkali aqueous solution to form a slurry; a second step for adjusting the pH of the slurry to 5.0 to 9.0; and a third step for subjecting the slurry to solid-liquid separation, washing the obtained cake, and adjusting the moisture content of the washed cake.

The invention discloses a metal oxide composite sodium ferric sulfate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The metal oxide composite sodium ferric sulfate positive electrode material comprises the following raw materials in parts by mass: 1-20 parts of sodium sulfate, 2-40 parts of ferrous sulfate, 0.05-1 part of an antioxidant, 0.05-1 part of a carbon source and 0.01-2 parts of metal oxide, the metal oxide is at least one of ferrous oxide, ferric oxide, ferroferric oxide, manganese oxide, manganese dioxide, cobalt oxide, cobaltosic oxide, cobaltic oxide, vanadium monoxide, vanadium dioxide, vanadium trioxide, vanadium pentoxide, nickel oxide and copper oxide. The invention also discloses a preparation method and application of the metal oxide composite sodium ferric sulfate positive electrode material. The method provided by the invention can solve the problems of low conductivity and specific capacity of the existing sodium ferric sulfate positive electrode material, and has the advantages of low cost, strong process adaptability and wide application prospect.

The present solution provides a hybrid coagulant based on aluminum-iron silicate, where the molar concentration of silicon is in the range of 0.1 to 0.5 mol∙l-1, the molar ratio of the sum of aluminum and iron to silicon is in the range of 1:0.5 to 1:1.5, the molar ratio of aluminum to iron is in the range of 0.5:1 to 5:1, and a method of its preparation by mixing hydrated aluminum sulfate, hydrated iron sulfate and an acidic solution of silicon dioxide.

This invention belongs to the field of solid waste resource recycling technology in the metallurgical industry. It discloses a process for preparing iron oxide red and extracting titanium dioxide from high-iron red mud. The process involves mixing high-iron red mud with an alkaline agent, followed by water leaching to obtain a water-leached solution and a water-leached residue. The water-leached solution undergoes desilication and carbon removal treatment to obtain aluminum hydroxide and sodium carbonate solutions. The water-leached residue is then acid-leached with sulfuric acid; silicon is recovered as silica gel, while aluminum and iron enter the solution and undergo polymerization to prepare a water purification agent. The acid-leached residue is treated with a high-temperature heap leaching-water leaching process using concentrated sulfuric acid to achieve efficient dissolution and separation of titanium. The titanium-iron mixed solution is subjected to stepwise crystallization control, successively precipitating ferric sulfate and ferrous sulfate crystals, which are then pyrolyzed to generate high-purity iron oxide red. Finally, the mother liquor is subjected to titanium precipitation and pyrolysis to obtain titanium dioxide. This invention achieves efficient separation and high-value utilization of all components of iron, titanium, aluminum, and silicon in red mud. The process flow is rationally cyclical, resulting in high-value-added products with low energy consumption and no secondary pollution.

The application belongs to the field of sodium ion battery materials, and mainly relates to a gel-free high-stability positive electrode slurry as well as a preparation method and application thereof. The positive electrode slurry raw materials comprise: 90-96 parts of sodium iron sulfate, 1-4 parts of a conductive agent, 2-6 parts of a binder, and 0.1-0.5 parts of a combined dispersant; the combined dispersant comprises: a monoester phosphate and a diester phosphate; wherein R in the ester group is one or more of dodecyl, phenyl, octyl, oleyl, polyethylene glycol group, and aminopropyl. The mixed system of the monoester phosphate and the diester phosphate is used as the dispersant, that is, the mixed system has high affinity with iron ions, locks the active metal ions on the particle surface, blocks the side reaction with the solvent, the short chain of the monoester quickly anchors the particle surface, the long chain of the diester extends into the solvent to form steric hindrance, and the double mechanism inhibits agglomeration, thereby improving the dispersibility and stability of the slurry.

The invention provides a method for removing and recovering vanadium in alumina seed precipitation mother liquor, which comprises the following steps: mixing the alumina seed precipitation mother liquor, a calcium-containing precipitator and a settling aid, carrying out vanadium precipitation reaction, and carrying out solid-liquid separation to obtain vanadium-containing solid and vanadium-precipitated liquid; wherein the calcium-containing precipitant comprises an activated calcium-based compound; the settling agent comprises polymeric ferric sulfate. The method provided by the invention is high in vanadium removal efficiency, simple in condition and easy to operate, simple in process flow, free from influence on recovery of rare metals, high in high-value resource utilization rate of vanadium and wide in application prospect.

The utility model relates to the technical field of material dissolving, in particular to a dissolving tank for producing polymeric ferric sulfate, which is capable of uniformly mixing materials. According to the technical scheme, the stirring device comprises a bottom plate, a base plate and a tank body, the tank body is arranged on the upper surface of the bottom plate, the base plate is arranged at an opening of the tank body in a lifting mode through a lifting assembly, a first-stage stirring assembly and a second-stage stirring assembly are arranged on the base plate, the first-stage stirring assembly is rotationally connected with the second-stage stirring assembly, and the second-stage stirring assembly is rotationally connected with the first-stage stirring assembly. The first-stage stirring assembly is located at the bottom of the tank body, and the second-stage stirring assembly is located in the middle of the tank body. According to the utility model, materials in different areas in the tank body can be effectively stirred at the same time through the matching of the structures, so that the overall material dissolving efficiency is improved, the working intensity of the motor can be adjusted according to actual requirements, and unnecessary energy consumption waste is avoided.

The present invention discloses a controlled-release type polymeric ferric sulfate water treatment agent and its preparation method, belonging to the technical field of water treatment functional materials. The water treatment agent consists of polymeric ferric sulfate, an iron ion color indicator, a gel matrix, a cross-linking calcium agent, amino diatomaceous earth, a pore-forming agent and an inert filler. The preparation method includes: first preparing a network gel, then preparing soft materials, and finally obtaining the product through pill-making and drying. The present invention realizes the slow release and controllability of polymeric ferric sulfate, and the color indicator can directly reflect the consumption state of polymeric ferric sulfate, facilitating storage, transportation, dosing and recovery.

This invention discloses an apparatus and process for removing sulfur dioxide from flue gas using siderite slurry, relating to the field of environmental protection technology. The apparatus comprises six major components: desulfurization, slurry circulation, slurry replenishment, oxidation, defoaming emission, and spent slurry treatment. The components are interconnected by pipelines. The process includes siderite pretreatment slurry preparation, slurry replenishment, flue gas desulfurization, sulfite oxidation, flue gas defoaming emission, and spent slurry treatment. Siderite is crushed and ground into a slurry with a specific particle size and solids content, which is then contacted countercurrently with sulfur-containing flue gas. Utilizing ferric carbonate, magnesium carbonate, and calcium carbonate in the slurry as desulfurizing agents, combined with the oxidation effect of air and ferric ions, sulfur dioxide is converted into ferric sulfate and calcium sulfate, achieving desulfurization. This invention has high desulfurization efficiency, with the sulfur dioxide content in the purified flue gas below 50 mg / Nm³. 3 It makes full use of low-grade siderite resources, and the desulfurization by-products can be utilized as resources. The process is simple and has no secondary pollution, resulting in significant economic and environmental benefits.

The invention discloses a liquid polyferric sulfate reducing substance rapid detection reagent and a preparation method thereof, and belongs to the technical field of reducing substance detection.According to the liquid polyferric sulfate reducing substance rapid detection reagent, qualitative judgment on the content of reducing substances can be directly achieved through solution color changes, complex titration operation and professional instrument analysis are not needed, and the detection accuracy is high. And the detection process is obviously simplified. Due to the rapid detection capability, the content of reducing substances in a product in the reaction kettle can be monitored in real time in the production process, the reaction process can be mastered in time, and time delay caused by detection in a sample feeding laboratory is avoided, so that invalid consumption of a catalyst and unnecessary prolonging of reaction time are effectively reduced, and the overall production efficiency is improved. Meanwhile, the qualitative judgment result of the reagent can directly correspond to the limit value requirement specified by the national standard, the requirement for rapidly screening the product quality in the production process is met, and convenient technical support is provided for ensuring that the final product meets the standard.