859 results about "Ferric salts" patented technology

The invention provides a nano enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: adding a stabilizer into a preheated solvent, and carrying out ultrasonic treatment; then adding ferric salt and cobalt salt, and adding alkali to adjust the pH value of the solution; then transferring the solution into a reaction kettle for reaction; and after the reaction, washing and separating to obtain the product. The obtained nano-enzyme is appropriate and uniform in particle size and good in dispersity, the enzyme activity is as high as 9.56 U / mg, and the application of the nano-enzyme in immunochromatography detection and plant canker prevention and treatment is widened. When the immunochromatography detection card prepared from the nano enzyme is used for detecting human hemoglobin, the detection limit can reach 0.05 ng / mL and is at least 10 times lower than that of a commercially available kit. When the nano-enzyme suspension is used for preventing and treating the kiwifruit canker, the nano-enzyme suspension with the concentration larger than or equal to 0.1 mg / mL is used, and the plant canker can be well controlled.

The invention discloses a composite electrode material for removing uranium through photoelectrocatalysis and a preparation method and application of the composite electrode material, and belongs to the technical field of catalytic materials and wastewater treatment.The preparation method of the composite electrode material comprises the following steps that a ZIF-8 material, copper salt and ferric salt are mixed, and a first metal composite material is prepared; reacting the first metal composite material with a KOH solution to prepare a second metal composite material; carrying out carbonization treatment on the second metal composite material, and then carrying out acid treatment by using acid to obtain a bimetallic atom catalytic material; the preparation method comprises the following steps: dispersing a bimetallic atom catalytic material and a g-C3N4 material in a mixed solution containing phytic acid and a Nafion solution to obtain catalyst ink; and coating the catalyst ink on a substrate, and carrying out illumination drying to obtain the composite electrode material. According to the composite electrode material, under the synergistic effect of the bimetallic single atomic cluster catalyst and g-C3N4, respective advantages are fully exerted, and efficient deposition removal of uranium is achieved.

The invention discloses a salt leaching-extraction method for recycling lithium iron phosphate and ternary lithium battery powder through cascade circulation, and belongs to the technical field of waste lithium battery recycling. According to the method, ferric salt is adopted as a leaching agent, a circulation mechanism is constructed through iron ion valence state conversion, and cascade leaching circulation of waste lithium iron phosphate and nickel cobalt lithium manganate battery powder is achieved. A concentrated enrichment liquid containing lithium, nickel, cobalt and manganese, iron phosphate and a graphite crude product can be obtained through multiple leaching cycles. In the leaching circulation process, a mixed solvent is developed as an extraction agent of iron ions, and after extraction and hydrochloric acid reverse extraction are carried out on a leaching solution containing iron salt, the leaching agent and the extraction agent can be recycled. According to the method, the valuable metal in the waste battery powder is efficiently leached under the milder reaction condition, consumption of chemicals such as acid and alkali, a leaching agent, an oxidizing agent and an extracting agent is effectively reduced through research of a circulation mechanism, the cost is remarkably reduced, and good environmental benefits and economic benefits are achieved.

The invention discloses a CoFeCuMn LDH nanosheet, a confinement catalytic membrane and a preparation method of the CoFeCuMn LDH nanosheet. The preparation method of the CoFeCuMn LDH nanosheet comprises the steps that A1, cobalt salt, ferric salt, copper salt and manganese salt are dissolved in pure water according to a preset proportion to prepare a first solution, sodium hydroxide is dissolved in pure water to prepare a second solution, and sodium carbonate is dissolved in pure water to prepare a third solution; a2, adding the first solution and the second solution into the third solution, and stirring to obtain a mixed solution; a3, carrying out hydrothermal reaction on the mixed solution; a4, centrifugally washing the product obtained in the step A3 to obtain a precipitate; and A5, the sediment is dried, and the CoFeCuMn LDH nanosheet is obtained. According to the CoFeCuMn LDH nanosheet, the confinement catalytic membrane and the preparation methods of the CoFeCuMn LDH nanosheet and the confinement catalytic membrane, the degradation efficiency and the degradation rate of new pollutants are remarkably improved.

The invention discloses a preparation method and application of monatomic iron-doped carbon quantum dot nano enzyme, and the preparation method comprises the following steps: fully dispersing citric acid, urea and iron salt, and fully reacting in a closed container; the ferric salt is any one of ferric citrate, iron methionine or ferrous lactate. The monatomic iron-doped carbon quantum dot nano-enzyme provided by the invention is good in dispersity, excellent in water solubility and uniform and stable in structure, has efficient antioxidant enzyme activity, can be easily absorbed by plants, can remarkably improve the antioxidant capacity and stress resistance of the plants after being applied, can remove excessively accumulated active oxygen of the plants, and also can effectively inhibit the growth of the plants. The soil heavy metal pollution control agent can control soil heavy metal pollution, also can improve the removal efficiency of antioxidant enzymes in plants, reduce heavy metal absorption and increase the plant yield, has the characteristics of small dosage, low cost, high efficiency, high environmental safety and easy use, and provides a new technology and product choice with practical application value for treatment of soil heavy metal pollution.

The invention discloses a high-efficiency sulfur-iron-based nitrogen and phosphorus removal and autotrophic denitrification composite filler and a preparation method thereof. The high-efficiency sulfur-iron-based nitrogen and phosphorus removal and autotrophic denitrification composite filler is characterized by comprising the following raw material components in percentage by mass: 1-60% of activated pyrite powder, 30-95% of sulfur, 1-10% of trivalent iron salt and 1-10% of limestone powder. And forming through a thermal compounding process. The preparation method comprises the following specific steps: firstly, activating the pyrite and the magnetic pyrite at high temperature under the protection of protective gas; sulfur is heated to be in a molten state; uniformly mixing the activated pyrite powder, trivalent iron salt and limestone powder to obtain a powdery mixed material; adding the powdery mixed material into molten sulfur, raising the temperature to 125-145 DEG C, and fully and uniformly mixing; and finally, cooling and curing the obtained material to obtain the autotrophic denitrification composite filler. According to the high-efficiency sulfur-iron-based autotrophic denitrification nitrogen and phosphorus removal composite filler prepared by the preparation method, pyrite is calcined and activated, ferric iron salt is used as an oxidizing agent to promote decomposition of the activated pyrite, and the electron donor release capability of the pyrite is improved, so that the high-efficiency nitrogen and phosphorus removal effect of the filler is realized.

The invention discloses a method for recovering lithium, nickel cobalt manganese composite hydroxide and aluminum copper powder from a waste ternary lithium ion battery pole piece. The method comprises the following steps: treating waste pole pieces of a ternary plant or a mixture of positive and negative pole pieces by using a Fenton technology, leaching by using a mixed ferric salt solution, and filtering to obtain lithium-containing leachate and slag; adjusting the pH value of the leachate, oxidizing and filtering to obtain a purified solution and ferric hydroxide precipitate, and adding the purified solution and a lithium hydroxide solution into a reactor for coprecipitation to obtain a deeply purified solution and the nickel-cobalt-manganese composite hydroxide. And dissolving the ferric hydroxide precipitate with dilute acid, adding a reducing agent to generate a ferrous salt solution, and returning the ferrous salt solution for Fenton reaction and leaching reaction. And adding the sodium carbonate saturated solution into the deep purification solution, and crystallizing and precipitating to obtain the battery-grade lithium carbonate. And performing hydrodynamic screening on the leaching residues to obtain an aluminum-copper mixture and graphite residues, and performing grinding and specific gravity separation on the aluminum-copper mixture to obtain high-purity aluminum powder and copper powder. According to the method, the iron salt is directly leached from the pole piece, the used iron salt can be recycled, and the method is suitable for large-scale recovery of the waste ternary lithium ion battery.

This invention discloses a method for leaching lithium iron phosphate mixed powder with iron salts and recovering all components, belonging to the field of battery recycling. The invention uses an iron salt solution to leach the mixed powder, obtaining a lithium-containing leachate and leaching residue. Ferrous ions in the leachate are regenerated into ferric iron through acidification and oxidation, and recycled for leaching the next batch of mixed powder. After reaching a preset number of cycles, the leachate is used for re-leaching multiple batches of leaching residue to improve the lithium leaching rate. Ultimately, a enriched solution containing Li, Fe, Cu, and Al and graphite-containing iron phosphate residue are obtained. Copper is recovered from the enriched solution through iron powder replacement, and a high-purity lithium chloride solution is obtained through extraction and separation, while ferric chloride (recycled) and aluminum chloride crystals are also recovered. The leaching residue is treated with hydrochloric acid to obtain regenerated graphite, and the pH is adjusted with alkali to obtain high-purity iron phosphate. This method achieves full component recovery under mild conditions, reducing separation steps and chemical consumption through a "leaching-regeneration-leaching" cycle mechanism, thus achieving both environmental and economic benefits.

The invention provides a preparation method of a lithium manganese iron phosphate composite material containing an MXene coating layer, and the method comprises the following steps: uniformly dispersing manganese salt, ferric salt, phosphorus salt and lithium salt solutions and an antioxidant in a dispersing agent respectively, and mixing to obtain a mixed solution; carrying out ultrasonic treatment on the mixed solution in a protective atmosphere to obtain a lithium manganese iron phosphate dispersion liquid; carrying out solid-liquid separation on the lithium manganese iron phosphate dispersion liquid, washing with water, and drying in a drying oven at a set temperature; calcining the lithium manganese iron phosphate solid, and cooling to room temperature to obtain a lithium manganese iron phosphate body material; the preparation method comprises the following steps: preparing a dispersion liquid from a lithium manganese iron phosphate body material, uniformly mixing the dispersion liquid with an MXene dispersion liquid, coating the outer surface of the lithium manganese iron phosphate body material with MXene under ultrasonic waves, and then filtering and freeze-drying to obtain the lithium manganese iron phosphate composite material. According to the lithium manganese iron phosphate composite material prepared by the invention, the conductivity of the material is effectively improved, and meanwhile, dissolution of manganese ions in the material can also be inhibited.

The invention provides aluminum-doped hematite, a preparation method of the aluminum-doped hematite and application of the aluminum-doped hematite in catalyzing peroxides to degrade organic pollutants or remove pathogenic bacteria. The preparation method of the aluminum-doped hematite comprises the following steps: adding ferric iron salt and aluminum salt into deionized water, reacting, precipitating to separate out a product, washing, drying and grinding to obtain a precursor; calcining the precursor, and then washing and drying to obtain the aluminum-doped hematite. The preparation method is simple, cheap and easily available in raw materials, low in cost, green, safe and environment-friendly; the aluminum element is introduced into the hematite, so that the catalytic activity of the hematite is improved, and the catalytic condition is easy to realize; the aluminum-doped hematite disclosed by the invention has excellent capability of activating peroxide, so that the aluminum-doped hematite shows excellent performance in the aspects of removing environmental organic pollutants and sterilizing.

The invention belongs to the technical field of supercapacitor electrode materials, and discloses a NiCoMoMnM-LDH high-entropy material and preparation and application thereof.The preparation method comprises the steps that a nickel salt, a cobalt salt, a manganese salt, an M salt and an ethanol water solution form a solution A; forming a solution B from molybdate, 2, 5-dihydroxy terephthalic acid and an organic solvent; mixing the solution A and the solution B, and performing hydrothermal reaction to obtain a precursor; dispersing the precursor in a sodium hydroxide solution, stirring, carrying out solid-liquid separation, washing, and drying to obtain a NiCoMoMnM-LDH high-entropy material; m salt is any one of zinc salt, ferric salt and copper salt. The preparation method disclosed by the invention not only avoids phase separation and element aggregation in the forming process of the high-entropy material, but also is high in universality, and the high-entropy hydroxide can be efficiently synthesized on a large scale; and the prepared high-entropy material is high in specific capacitance and good in rate capability and cycling stability, and can be applied to a positive electrode material of a supercapacitor.

The invention discloses a recovery method for extracting lithium, copper and aluminum from waste lithium iron phosphate batteries. The method comprises the following steps: firstly, pretreating the lithium iron phosphate waste battery to obtain a sheet-shaped positive and negative pole piece mixture, then leaching the pole piece mixture by taking a ferric iron salt solution as a leaching agent, and filtering to obtain a lithium-containing leachate and ferrophosphorus slag containing copper and aluminum current collectors; and oxidizing the lithium-containing leaching solution, adjusting the pH value, filtering and separating to obtain a lithium-containing purified solution and ferric hydroxide precipitate. Continuously increasing the pH value of the lithium-containing leachate to remove impurities, adding a sodium carbonate saturated solution, and precipitating and crystallizing to obtain lithium carbonate; and dissolving the ferric hydroxide precipitate with dilute acid to prepare a ferric salt solution which is circularly used as a leaching agent. Comprising ferrophosphorus slag of copper and aluminum current collectors, a copper and aluminum current collector mixture and the ferrophosphorus slag are obtained through separation of hydrodynamic screening equipment, the copper and aluminum current collector mixture is dried, ground and then separated through a specific gravity separator, and copper powder and aluminum powder are obtained. According to the method, the technological process is shortened, the project investment and the production cost are relatively low, and the method is suitable for large-scale recycling treatment of the waste lithium iron phosphate batteries.

The invention provides a method for preparing battery-grade lithium iron manganese phosphate from lithium iron phosphate lithium extraction slag and application of the battery-grade lithium iron manganese phosphate. The preparation method comprises the following steps: carrying out acid leaching on the ferrophosphorus slag to obtain a leaching solution and leaching slag; adding a manganese salt and an iron salt into the leachate to supplement manganese and iron, and then mixing with a precipitant solution and a complexing agent solution to carry out coprecipitation reaction to obtain a ferromanganese phosphate precursor; carrying out hydrothermal reaction on the ferromanganese phosphate precursor and a lithium source to obtain a lithium ferromanganese phosphate precursor; and sintering the lithium manganese iron phosphate precursor to obtain the battery grade lithium manganese iron phosphate, wherein acid adopted in the acid leaching process comprises phosphoric acid. According to the preparation method provided by the invention, the recovery rate of phosphorus and iron in the waste residues can reach 96% or above, the obtained lithium manganese iron phosphate material is high in purity, small in particle size and uniform in distribution, and the electrical property can reach the level of battery-grade lithium manganese iron phosphate; in addition, the preparation method is short in technological process, high in production efficiency and suitable for large-scale production.

The invention discloses a high-entropy layered double hydroxide with a strong strain effect and a preparation method of the high-entropy layered double hydroxide. The preparation method comprises the following steps: firstly, preparing ferric salt, cobalt salt, nickel salt, copper salt and zinc salt into a mixed aqueous solution of five metal salts; preparing sodium hydroxide and sodium carbonate into an alkali source aqueous solution; then mixing and stirring the mixed aqueous solution of the five metal salts and the alkali source aqueous solution to gradually form yellowish-brown precipitates, then transferring the yellowish-brown precipitates into a polytetrafluoroethylene reaction kettle, and further reacting in a drying oven; and finally, carrying out centrifugal separation, deionized water and absolute ethyl alcohol washing and freeze drying on the fully reacted precipitate to obtain brown powdery solid, namely the high-entropy layered double hydroxide. The high-entropy layered double hydroxide can be used for advanced oxidation catalytic degradation of tetracycline antibiotic wastewater, the strong strain effect of the high-entropy layered double hydroxide enhances the benefit of activating peroxymonosulfate to generate active free radicals, the efficiency of degrading water pollutants is improved, and the high-entropy layered double hydroxide has good application prospects.

The invention discloses a method for synthesizing ferric phosphate pyrophosphate and preparing a sodium ferric phosphate pyrophosphate positive electrode material. The method comprises the following steps: S1, preparing a raw material solution; s2, adding the ferric salt solution, the phosphate radical solution and the pyrophosphate radical solution into the reaction base solution, controlling the pH value, and carrying out coprecipitation reaction; s3, filtering and washing, adding water, and pulping again; s4, heating and crystallizing; s5, filtering and drying; s6, sintering to obtain ferric pyrophosphate Fe6 (PO4) 2 (P2O7) 3; s7, adding ferric pyrophosphate, a sodium source and a carbon source into water, pulping, and sanding; s8, spray drying; and S9, sintering is carried out, such that Na4Fe3 (PO4) 2 (P2O7) / C is obtained. According to the method, a precursor Fe6 (PO4) 2 (P2O7) 3 is synthesized firstly, long-range ordered mixing of Fe and P elements on the atomic scale is achieved, the morphology and particle size of the precursor are controllable, the problem of generation of inactive impure-phase NaFePO4 in the synthesis process of ferric sodium pyrophosphate can be effectively solved, the raw material utilization rate is high, and the synthesized positive electrode material is large in tap density and compaction density and excellent in electrochemical performance.

The invention discloses a high-compaction-density ferromanganese phosphate precursor and a preparation method thereof, and belongs to the technical field of lithium batteries, and the provided preparation method comprises the following steps: step 1, respectively dissolving a manganese source, an iron source and a phosphorus source in water to form solutions; 2, adding a complexing agent into the iron source solution to form a complexing iron salt solution; step 3, mixing the complexing ferric salt solution, the manganese source solution and the phosphorus source solution, adding an oxidizing agent and alkali liquor, keeping the pH value of the system to be 5.5-8, heating and stirring for reaction, and synchronously introducing oxygen for bubbling during reaction; and 4, after the reaction is finished, carrying out solid-liquid separation, and drying and roasting to obtain the ferromanganese phosphate precursor. According to the method, under the action of the complexing agent, the homogeneity of iron-manganese coprecipitation is improved, oxygen is introduced for bubbling in the reaction process, and excessive growth of crystals is inhibited while the oxidation condition is ensured, so that the ferromanganese phosphate precursor is proper in particle size and uniform in distribution, and the positive electrode material prepared from the precursor has high compaction density and excellent electrochemical performance.

The invention relates to an electrochemical cleaning method for removing organic matters on the surface of a silicon carbide wafer, which comprises the following steps of: immersing the silicon carbide wafer with the polluted surface into electrolyte containing bivalent and / or trivalent ferric salt, applying voltage or current between a cathode material and an anode material, and carrying out electrochemical reaction to remove the organic matters on the surface of the silicon carbide wafer. The surface of the silicon carbide wafer is subjected to organic matter removal. According to the method, an electrochemical oxidation method technology is adopted, the strong oxidation effect of hydroxyl free radicals is utilized, organic residues on the surface of the silicon carbide wafer are oxidized and decomposed into short-chain organic matter, water, carbon dioxide and other products, and the purpose of removing the organic residues is achieved. The method provided by the invention is simple and efficient, can quickly remove organic pollutant residues on the surface of the silicon carbide wafer, does not use high-concentration chemicals and organic component cleaning agents which are difficult to degrade in the cleaning process, is safe and reliable to operate, reduces the consumption of the chemicals, avoids secondary pollution, and is more environment-friendly.

The invention belongs to the technical field of new materials, and particularly relates to a PEDOT electromagnetic shielding polymer film, a preparation method and application, a substrate coated with an oxidizing agent solution is subjected to a polymerization reaction in steam containing an EDOT monomer, then an oxidizing agent is removed, drying is performed, and the PEDOT electromagnetic shielding polymer film is obtained; the oxidant solution comprises ferric salt, an additive and water, and the additive is one or more of polyvinyl alcohol, polyvinylpyrrolidone, starch, polyethylene glycol and a polyoxypropylene polyoxyethylene copolymer; the PEDOT electromagnetic shielding polymer film provided by the invention has relatively high density and lower resistance, and can improve the electromagnetic shielding effect.

The utility model relates to the technical field of iron phosphate production, and discloses iron solution reaction equipment for iron phosphate production, the iron solution reaction equipment comprises a reaction kettle body, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively communicated with the top and the bottom of the reaction kettle body, a stirring mechanism is arranged in the reaction kettle body, and a heating mechanism is arranged on the outer side of the reaction kettle body. The stirring mechanism comprises a driving motor, a connecting rod, a stirring plate, a supporting ring and a filter screen. According to the iron solution reaction equipment for iron phosphate production, when an iron salt solution and a phosphate solution react in the reaction kettle body, the connecting rod drives the stirring plate to rotate to stir the iron salt solution and the phosphate solution, so that the iron salt and phosphate are mixed more thoroughly, and the iron phosphate production rate is increased; meanwhile, ferric phosphate precipitated to the bottom of the reaction kettle body is shielded and filtered by the filter screen, so that the ferric phosphate is not easy to float upwards to influence the reaction of ferric salt and phosphate solution, and the reaction rate of ferric salt and phosphate solution is further improved.

The invention discloses a preparation method of a carbon-coated single-crystal sodium ferric pyrophosphate positive electrode material, which is specifically implemented according to the following steps: step 1, dissolving sodium salt, ferric salt and phosphate in deionized water in proportion, then adding a carbon source into the solution, and uniformly stirring to obtain a mixed solution; step 2, fully drying the mixed solution obtained in the step 1 to obtain precursor powder; and 3, carrying out heat treatment on the precursor powder in a protective atmosphere, and cooling to obtain the carbon-coated single-crystal sodium ferric pyrophosphate positive electrode material. The invention also discloses a coating prepared by the method, a single-crystal structure is combined with uniform carbon coating, grain boundary defects are eliminated, conductivity is improved, high specific capacity and long cycle life are realized, single-crystal growth and carbon layer in-situ coating are synchronously realized by a synthesis process, and structural integrity and efficient conductive network construction can be ensured.

The invention relates to a sunken porous magnetic alloy ball wave-absorbing material and a preparation method and application thereof.The wave-absorbing material is prepared through the following steps that S1, citric acid, soluble ferric salt, soluble cobalt salt and soluble nickel salt are dissolved in a mixed solvent of ethylene glycol and water, and the mixture is fully stirred to form a uniform mixed solution; and S2, the mixed solution obtained in the step S1 is subjected to spray drying, obtained precursor powder is placed in the air atmosphere to be calcined to remove the carbon source, then the precursor powder is placed in the H2 / Ar atmosphere to be subjected to heating reduction, and the porous FeCoNi alloy balls with the surface pits are obtained and are the target product. The surface of the prepared alloy microsphere has an obvious concave structure, magnetic anisotropy and magnetic performance are enhanced, a small number of pores are generated in the reduction process, impedance matching of the material is optimized, and effective high-frequency electromagnetic absorption is achieved; and due to the synergistic effect of the recesses and the pores, the obtained alloy microspheres have obvious lightweight characteristic, and have good application prospects in the field of electromagnetic absorption.

The invention belongs to the technical field of organic solid waste resource utilization, and particularly relates to iron modified waste residue biochar as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing lignin-rich waste residues with a specific ferric salt solution, obtaining a carbon precursor by virtue of an impregnation method, and promoting biomass pyrolysis to form a graphitized structure by virtue of pyrolysis calcination, so as to obtain the Fe-loaded modified waste residue biochar. The obtained iron-modified waste residue biochar is added into an anaerobic digestion system with organic waste as a substrate, the stability of the anaerobic system can be enhanced by means of the high adsorption and buffering capacity of the biochar, Fe loaded on the surface of the iron-modified waste residue biochar can serve as an electronic mediator, the activity of related enzymes in the anaerobic system is enhanced, and the anaerobic digestion efficiency is improved. Meanwhile, the electrochemical performance of the biochar is enhanced, microelements required by growth can be provided for microorganisms, and the digestion efficiency of the system is improved, so that the total yield of methane subjected to anaerobic digestion is increased, and harmless treatment and resource utilization of organic wastes can be realized.

The invention belongs to the technical field of flow battery energy storage, and more specifically relates to a near-neutral total iron flow battery negative electrode electrolyte and a preparation method thereof, the negative electrode electrolyte is prepared from an iron salt, a chelating agent, a stabilizing agent, a supporting electrolyte and water at a certain temperature, the total iron concentration is 0.1-1.0 M, the molar ratio of the chelating agent to the iron salt is 1.2-2.0, the molar ratio of the stabilizing agent to the supporting electrolyte is 1.2-2.0, and the total iron concentration is 0.1-1.0 M. The molar ratio of the stabilizer to Fe is 0.25-1.0, the supporting electrolyte concentration is 0-2.0 mol / L, and the pH value is 7.0-8.5. The near-neutral negative electrode electrolyte for the total-iron flow battery is high in stability, can effectively inhibit generation of ferric hydroxide precipitates under a neutral condition, improves the stability of iron ions, greatly prolongs the cycle life of the total-iron flow battery, and can be widely applied to various aqueous flow batteries.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

A phosphogypsum harmless agent and an engineering application method therefor. The agent is composed of a powder component and a liquid component, wherein the powder component is composed of an alkaline component and talcum powder, the alkaline component being at least one of calcium oxide, magnesium oxide, calcium hydroxide and magnesium hydroxide; and the liquid component is an aqueous solution of at least one of a soluble ferric salt, aluminum salt and calcium salt. The engineering application method therefor comprises: S1, crushing and sieving phosphogypsum until the particle size is 1-5 mm, while adjusting the moisture content of attached water to 5-10%; S2, uniformly mixing the phosphogypsum with a powder component; S3, adding a liquid component, and adjusting the moisture content of attached water to 12-20%; and S4, maintaining same for test. In the agent, multiple components are compounded and divided into a powder component and a liquid component, so as to fully utilize the synergistic effect of the components; the mixing is performed by adding the powder agent and the liquid-phase agent stepwise, thereby adjusting the water content stepwise, regulating and controlling the mixing uniformity, controlling flying dust during the engineering implementation process, and achieving more environmentally friendly and more efficient engineering application.

The invention relates to the technical field of wastewater treatment, in particular to a preparation method and application of iron modified montmorillonite. The preparation method comprises the following steps: adding montmorillonite into water, carrying out ultrasonic treatment, and then centrifuging to obtain supernate; centrifuging the supernate, and freeze-drying the obtained precipitate to obtain pretreated montmorillonite; dispersing the pretreated montmorillonite in water, adjusting the pH value of the solution to be acidic, and stirring; then adding ferric iron salt, stirring and centrifuging; dispersing precipitates obtained by centrifugation into a ferric iron salt solution, stirring and centrifuging; repeating the steps of dispersing the precipitate obtained by centrifugation into the ferric iron salt solution, stirring and centrifuging; and washing the precipitate obtained by the last centrifugation, and then freeze-drying to obtain the iron modified montmorillonite. The iron-modified montmorillonite can effectively degrade the triazine herbicide simazine, is simple to prepare, wide in raw material source and low in price, and has important significance in removal of refractory pollutant triazine herbicides.

The invention discloses a mine water fluorine removal agent and a preparation method and application thereof, and belongs to the technical field of wastewater treatment.The preparation method of the fluorine removal agent comprises the following steps that aluminum salt, calcium salt, magnesium salt and ferric salt are added into water to be stirred, then a chelating agent, a hydroxy carboxylic acid compound and a dispersing agent are added, the mixture is heated to 40-60 DEG C to be stirred and dispersed, and heat preservation is conducted. The preparation method gets rid of the constraint of traditional calcium salt, introduces the chelating agent, the hydroxy carboxylic acid compound and the dispersing agent on the basis of controlling the compatibility of the materials and the synthesis reaction process, and utilizes the excellent fluorine ion adsorption performance and flocculation settling performance of the aluminum-calcium-magnesium-iron-based quaternary metal material to improve the fluorine ion adsorption performance of the aluminum-calcium-magnesium-iron-based quaternary metal material. Quaternary metals are assembled into a long-chain porous structure through chelation, the specific surface area and the pore volume are further increased, the contact area with fluorine ions in mine water is increased, and the porous structure adsorbs complexing groups to achieve the purposes of rapid coordination, strong adsorption, precise chelation, flocculating settling and efficient removal of fluoride in mine water.

The invention discloses a preparation method of red-mud-based artificial soil, which comprises the following steps: A, mixing and stirring red mud, calcium-based solid waste, industrial ferric salt, manganese slag and water according to a mass ratio, and fully stirring to fully react to obtain dealkalized red mud; wherein the mass ratio of the red mud to the calcium-based solid waste to the industrial ferric salt to the manganese slag to the water is 100: (1-5): (0.1-1): (0.1-1): (10-50); b, mixing the dealkalized red mud with the fly ash, the biomass and the stable organic solid waste, and fully and uniformly stirring to obtain a mixture; and C, naturally stacking the mixture and fertilizing. The method can accelerate the red mud harmlessness and soil treatment process, and reduces the environmental pollution risk of the storage yard.

The invention discloses a metal organic framework catalyst as well as preparation and application thereof in viscosity reduction of super heavy oil, and belongs to the technical field of catalytic pyrolysis. The metal organic framework catalyst provided by the invention is prepared from transition metal salt, an organic ligand and a solvent, wherein the transition metal salt is at least one of ferric salt, nickel salt, copper salt and titanium salt; the organic ligand is a carboxylic acid compound with carboxylic acid or a nitrogen-containing heterocyclic ring compound. The catalyst disclosed by the invention has an ultrahigh specific surface area and sufficient active sites, can realize in-situ catalytic modification of the super-heavy oil at an oil reservoir temperature, and effectively reduces the viscosity of the super-heavy oil.

The invention belongs to the field of sewage treatment, and discloses a two-phase mud film efficient synchronous nitrogen and phosphorus removal process. By integrating biological denitrification and chemical phosphorus removal technologies and adopting a two-phase treatment unit, efficient and synchronous removal of nitrogen and phosphorus in sewage is realized. According to the process, a biological treatment procedure of denitrifying bacteria and nitrifying bacteria under an anaerobic and aerobic alternating condition is utilized, and ammonia nitrogen and nitrate nitrogen in sewage are effectively removed by controlling reaction conditions and formation of a mud film. Meanwhile, ferric salt and polyaluminum chloride flocculants are used for chemical precipitation, phosphate ions form insoluble precipitates by adjusting the pH value and the adding amount, and activated carbon or a zeolite adsorption material is combined for adsorption, so that phosphorus is further removed. The method has the advantages of high treatment efficiency, low operation cost, simplicity and convenience in operation and wide applicability, and an efficient, economic and environment-friendly solution is provided for sewage treatment.