130 results about "Sulfate radicals" patented technology

To provide a method for producing coated particles that, when used as a positive electrode active material for non-aqueous electrolyte secondary batteries, including lithium-ion secondary batteries, result in non-aqueous electrolyte secondary batteries exhibiting excellent charge / discharge capacity, electrical resistance, and cycle characteristics. [Solution] The manufacturing method according to the present disclosure comprises an addition step of adding a boron-containing additive compound to a lithium metal composite oxide to obtain a mixture, and a heat treatment step of applying heat treatment to the mixture to obtain coated particles, wherein in the heat treatment step, the sulfate ion concentration in the mixture before heat treatment is 1200 ppm or more and 5000 ppm or less, and the amount of sulfate ions relative to the amount of boron (SO4 / B) is 0.1 (mol / mol) or more and 1.0 (mol / mol) or less.

The application provides a method for separating magnesium and lithium in brine, comprising the following steps: pretreating the brine to obtain pretreated brine; performing primary nanofiltration, secondary nanofiltration and reverse osmosis concentration on the pretreated brine; the nanofiltration membrane selected for the primary nanofiltration is a carboxylated MOF modified nanofiltration membrane; and the raw materials for preparing the carboxylated modified nanofiltration membrane comprise a support, piperazine, carboxylated ZiF-8 and carboxylated Uio-66. The application reduces the risk of nanofiltration membrane pollution by pretreating the brine, pumps the pretreated brine into a nanofiltration system, generates a cut-off liquid rich in magnesium and sulfate ions and a high-lithium permeate liquid, performs secondary nanofiltration on the cut-off liquid to recover lithium, the secondary cut-off liquid can be used as a resource, the permeate liquid enters a reverse osmosis membrane, the lithium content is concentrated, the concentrated lithium liquid enters a lithium precipitation process, and the method for separating magnesium and lithium in the nanofiltration process realizes the impurity removal process for lithium recovery.

This disclosure relates to a desulfurization method for sulfur-containing wastewater, comprising the following steps: the sulfur-containing wastewater is introduced into an anaerobic biological unit for sulfate reduction treatment to obtain reduced wastewater; the reduced wastewater and oxygen-containing gas are introduced into a hydrogen sulfide stripping unit for stripping treatment to obtain hydrogen sulfide gas products and stripped water; the stripped water is introduced into a water quality stabilization unit for activated carbon adsorption treatment to obtain purified water; the hydrogen sulfide gas products and air are introduced into a biological oxidation unit for hydrogen sulfide oxidation treatment to obtain elemental sulfur and tail gas; the tail gas obtained from the biological oxidation unit is introduced into a tail gas treatment unit, where it undergoes sequential water vapor removal treatment, activated carbon adsorption treatment, and photocatalytic oxidation treatment to obtain purified tail gas. This disclosure enables efficient treatment of high-concentration sulfate wastewater and the recovery of elemental sulfur.

The present application relates to a method for reducing the content of sulfur in aluminum fluoride, which comprises the following steps: uniformly mixing crude aluminum fluoride powder containing sulfate impurities with ammonium hydrogen fluoride powder to obtain a mixture; placing the mixture in a reactor and performing programmed temperature calcination under a protective atmosphere; discharging the sulfur and fluorine-containing volatile gas generated by calcination after treatment by an absorption system; cooling the calcined material to room temperature; washing the cooled material with water or blowing inert gas to remove residual ammonium salt or dust, and then drying to obtain a low-sulfur aluminum fluoride product. The in-situ HF generated by the decomposition of NH4HF2 is used for gas-solid reaction, which can effectively attack and convert stable sulfate impurities existing in various forms, has high desulfurization efficiency and is deep and thorough; the reaction conditions are mild, the main phase of the product is stable, the process flow is simple, and the energy consumption is low.

The utility model relates to a wastewater denitrification and desulfurization treatment device which is characterized in that a water distributor is arranged at the lower part of an anaerobic reaction tank of an anaerobic reactor, a three-phase separator is arranged at the upper part of the anaerobic reaction tank of the anaerobic reactor, and a stirrer is arranged on an anoxic reaction tank of an anoxic reactor; an overflow port of the anaerobic reaction tank is connected and communicated with the anoxic reaction tank, a reflux port of the anaerobic reaction tank is connected and communicated with the anaerobic reaction tank through a wastewater reflux pipe, an aerator is arranged at the bottom of an aerobic reaction tank of the aerobic reactor, the anoxic reaction tank is connected and communicated with the aerobic reaction tank, a partition plate is arranged in the settling pond, a water inlet area is arranged on one side of the partition plate, and a settling area is arranged on the other side of the partition plate. A clear liquid outlet pipe is arranged at the upper part of the inclined plate of the sedimentation tank, a communicated clear liquid return pipe is arranged at the front part of the clear liquid valve of the clear liquid outlet pipe, and the clear liquid return pipe is communicated with the anoxic reaction tank. According to the device, the sulfate radical removal rate is high, nitrate in the wastewater can be simultaneously removed while sulfate radicals in the wastewater are removed, and the equipment investment and the treatment cost are reduced.

This invention relates to the field of hydrometallurgical technology, specifically disclosing a molybdenum removal extractant suitable for sulfuric acid-based waste acid systems and its preparation method. The method includes: S1. Dehydrating aromatic kerosene to obtain a dehydrating diluent; S2. Sequentially adding tri-n-butyl phosphate, di(2-ethylhexyl)phosphoric acid, and a phase modifier to the dehydrating diluent, stirring to obtain a pre-extractant; S3. Pre-equilibrium liquid prepared with sulfuric acid and sodium sulfate, mixing the pre-extractant and the pre-equilibrium liquid by vibration, separating to obtain an organic phase, controlling the TBP·H₂SO₄ addition ratio in the organic phase to obtain an activated organic phase; S4. Adding an antioxidant to the activated organic phase, filtering, aging, to obtain the finished product. This invention, by controlling the preparation process of the molybdenum removal extractant, can obtain a finished extractant with stable phase behavior and high molybdenum removal selectivity under high acid / high sulfate conditions, facilitating continuous industrial operation.

The application discloses a kind of heavy metal wastewater continuous treatment methods rich in sulfate, belong to environmental management technical field.The method relies on adjusting tank, reaction tank, oxidation tank, sedimentation tank, transfer tank and filter press equipment, and uses calcium aluminate crystal lattice solidification method to treat wastewater: first, wastewater pH is adjusted to 7.0~8.0 by alkaline compound, then calcium source heavy metal removal agent A, oxidizing agent heavy metal removal agent B and aluminum source heavy metal removal agent C are added respectively, the pH of wastewater after reaction is controlled to 9.0~11.0, and the solid-liquid separation is carried out by filter pressing after 0.5h~1.5h continuous reaction.The method permanently fixes heavy metal ions in calcium aluminate crystal lattice through ion exchange, solves the problems of low efficiency, secondary pollution of sulfide and large amount of hazardous waste sludge in traditional chemical precipitation method, and realizes continuous and cooperative deep removal of sulfate and heavy metals.The filtrate meets the discharge standard, and the filter residue has no leaching toxicity, which can be used as foundation cushion and mine soil covering for secondary utilization.The method is efficient, low in cost, and suitable for industrial continuous treatment.

Disclosed is a wastewater treatment method capable of selectively separating and highly purifying a low-molecular-weight valuable substance. The present invention is a wastewater treatment method including a step of separating a wastewater containing a low-molecular-weight valuable substance having a molecular weight of less than 100 and a cation using a nanofiltration membrane, characterized in that the nanofiltration membrane has a SO4 2‑ rejection rate of 90% or more when a 2000 mg / L aqueous MgSO4 solution is treated at 25°C under an operating pressure of 0.76 MPa, and the wastewater treatment method includes a step of adding a sulfate ion component to the wastewater.

This invention relates to the field of electrode materials technology, specifically to a high-entropy layered double hydroxide electrode material, its preparation method, and its application. The electrode material includes a metal substrate and a layered double hydroxide with a high-entropy structure grown in situ on the surface of the metal substrate. The layered double hydroxide consists of a main layer and intercalated anions filling the spaces between the main layers. The main layers include Ni, Co, Fe, Cu, and Al elements, and the intercalated anions are any one of phosphate, carbonate, or dodecyl sulfate. The high-entropy layered double hydroxide electrode material of this invention uses phosphate, carbonate, or dodecyl sulfate intercalation to adjust the interlayer structure, effectively expanding the interlayer spacing of the high-entropy layered double hydroxide to form an interlayer microenvironment more conducive to ion migration and interfacial reactions during electrochemical hydrodechlorination.

This application relates to the field of polymer materials, specifically disclosing a resin for removing nitrate nitrogen from high-concentration sulfate solutions and its preparation method. The preparation method includes the following steps: S1, dispersing an oil-phase solution containing styrene, divinylbenzene, a porogen, and an initiator in an aqueous solution, polymerizing, and then washing with a solvent to obtain porous polymer spheres; S2, subjecting the obtained porous polymer spheres to chloromethyl ether for chloromethylation treatment to obtain a pre-modified resin; S3, subjecting the pre-modified resin to an amination reaction with an amination reagent to obtain a nitrate-removed resin; the nitrate-removed resin has a pore size of 2-10 nm accounting for 50-90%; this application also discloses the nitrate-removed resin prepared by the above preparation method. This application has the characteristic of achieving the removal of nitrate nitrogen from high-concentration sulfate wastewater.

This invention provides a method for quantitatively assessing the degree of sulfate attack on concrete, relating to concrete attack assessment technology, including: plotting SO4... 2‑ Concentration standard curve; determination of free SO4 in the sample. 2‑ Content, denoted as C （游离） Determine the total SO4 content of the same mass of test samples from the same source. 2‑ Content, denoted as C （总） C （总） With C （游离） The difference is the content of bound sulfate ions in the sample to be tested, denoted as C. （AFt，AFm） ; Calculate the bound sulfate content C per gram of the sample to be tested. 1 （AFt，AFm） :;C 1 （AFt，AFm） The value represents the amount of ettringite and monosulfide-type hydrated calcium sulfoaluminate formed. Using the formation of ettringite and monosulfide-type hydrated calcium sulfoaluminate as an evaluation index, the degree of sulfate attack on concrete is assessed. This method achieves a quantitative assessment of the degree of sulfate attack on concrete from the perspective of the chemical nature of the attack, and features accurate quantification, simple operation, and the ability to distinguish SO4. 2‑ Advantages such as shape.

This invention relates to the field of lithium-ion battery technology, specifically to a method for recycling aluminum metal from high-aluminum cathode material black powder in waste lithium batteries. The method includes: dry mixing the black powder with anhydrous sodium sulfate, acidifying with concentrated sulfuric acid, spraying with an aqueous sodium sulfate solution and adding sodium bisulfate monohydrate to obtain a pretreated material; after staged acidification and roasting, lithium is extracted by water leaching; the water leaching residue is leached under low-acid conditions; the low-acid leachate is precipitated with sodium fluoride to obtain cryolite; the post-aluminum precipitate is then treated with iron removal and pH adjustment to prepare a nickel-cobalt-manganese extraction pre-liquid. This invention, by controlling the distribution of sulfate ions on the aluminum surface and staged roasting, reduces the gas production and aluminum load during low-acid leaching, combined with the directional precipitation of aluminum using low-pH cryolite. This achieves efficient lithium recovery while significantly reducing the loss of nickel, cobalt, and manganese with the aluminum slag. Aluminum is recovered in the form of cryolite for high-value recovery, greatly improving resource utilization and process safety.

This invention relates to the field of wastewater treatment technology, and in particular to a bimetallic doped self-supporting electrode, its preparation method, and its application. Constructed via a two-step chemical vapor deposition method, the bimetallic doped self-supporting electrode MN-SnO2 / GF / NF comprises a foamed nickel substrate GF / NF coated with foamed graphite, and a bimetallic doped SnO2 layer MN-SnO2 grown in situ on the foamed nickel substrate GF / NF, wherein M and N are any two of Sb, In, Fe, Co, and Mn. This invention, employing the aforementioned bimetallic doped self-supporting electrode, its preparation method, and its application, possesses advantages such as tight interfacial bonding and fast electron transport, and can efficiently drive sulfate radical-mediated pollutant degradation reactions.

The application discloses a closed-loop electrochemical alkali production method and system based on seawater decalcification and dechlorination pretreatment and sulfate migration regeneration, and comprises the following steps: S1, making seawater pass through a cation exchange resin unit and an anion exchange resin unit in sequence to remove Ca 2+ and Cl ‑ in the seawater, and obtaining sulfate-containing seawater; S2, introducing the sulfate-containing seawater into a middle cabin of a three-tank electrochemical device, applying an electric field, and forming an acid solution containing sulfuric acid in an anode cabin; and S3, taking the acid sulfate-containing solution as a regeneration liquid, and recycling the regeneration liquid to regeneration of the cation exchange resin and the anion exchange resin in the step S1, and making the regenerated cation exchange resin and the anion exchange resin perform the step S1 again. The application removes Ca 2+ in seawater in advance before electrochemical alkali production, avoids the Ca ‑ from forming deposition in a high OH ‑ environment, reduces membrane pollution and electrode scaling problems, and improves the continuous operation stability of the system.

This invention discloses a method for determining the concentration of sulfated glycosaminoglycans using fluorescence spectroscopy. The fluorescent probe carries a certain number of arginine residues. Utilizing the electrostatic interaction between the amino groups on the arginine residues and the sulfate ions on the sugar chains, a series of fluorescent probe molecules can align neatly along the sugar chains to form a stable fluorescent complex. Due to the small spatial distance between the fluorescent chromophores in the complex, the original fluorescence emission band shifts. By calculating the ratio of the fluorescence intensities at two points, the concentration of sulfated glycosaminoglycans can be determined. This invention provides accurate detection results, good reproducibility, and high sensitivity; the experimental materials are simple, saving a significant amount of time.

The application relates to a hydrochloric acid-sulfuric acid mixed acid supporting electrolyte and application thereof in a tin-iron liquid flow battery. The mixed acid supporting electrolyte is an acidic mixed aqueous solution containing chloride ions and sulfate ions, and the molar concentration ratio of the chloride ions to the sulfate ions is 5-7:1. On the basis of the mixed acid supporting electrolyte, tin sources and iron sources are dissolved to serve as negative and positive active materials respectively. The tin-iron liquid flow battery adopting the mixed acid supporting electrolyte of the application can be stably operated for more than 500 hours under an 80 mA cm −2 Current density. The deposited tin in the system presents uniformly distributed polyhedral particles, forms a dense and continuous covering layer on the surface of carbon fibers, has high nucleation density and uniform deposition. The application provides the mixed acid supporting electrolyte for the tin-iron liquid flow battery, the specific molar ratio of the chloride ions to the sulfate ions is accurately constructed, the coordination of the two at the electrode interface is realized, and thus the performance bottleneck is broken through.

A hydraulic binder including (in % by dry weight); A. at least 50 of at least one ground and granulated blast-furnace slag; B. more than 5 of at least one calcium aluminate cement and / or of at least one calcium sulfoaluminate cement; C. more than 5 of at least one source of sulfate ions; D. between 1 and 5 of Ca(OH)2 and / or Portland cement; E. between 0.01 and 1 of at least one alkali metal carbonate; F. and at least one alkalifying reagent consisting of at least one alkali metal carbonate and / or bicarbonate, different from E; under the following conditions: (i) amount of C allows sulfate ions of C to react with B and A; (ii) the amount of F sufficiently causes a reaction with D in water resulting in a wet formulation with a pH not less than 12, for a water-to-mortar mixing rate between 10 and 35% by weight.

Provided is a method for producing lithium hydroxide, comprising the steps of: introducing a lithium salt solution into a salt solution compartment, and introducing water into an acidic solution compartment and a basic solution compartment; discharging, from the acidic solution compartment, a sulfuric acid solution including sulfuric acid ions separated from the lithium salt solution by an anion-selective ion exchange membrane and hydrogen ions generated by decomposing water through electrodialysis in a first bipolar membrane; discharging, from the basic solution compartment, a lithium hydroxide solution including lithium ions separated from the lithium salt solution by a cation-selective ion exchange membrane and hydroxide ions generated by decomposing water through electrolysis in a second bipolar membrane; and adding an additive to the lithium hydroxide solution discharged from the basic solution compartment to precipitate impurities and remove same.

Disclosed in the present invention are a wastewater adsorbent, and a preparation method therefor and the use thereof. The method comprises: mixing a carbon black powder and an ammonium salt solution, heating same for a hydrothermal reaction, followed by filtering, and washing the obtained filter residues with acid to obtain an ammonium-salt-modified carbon black; mixing and grinding a nickel-cobalt-manganese mixed salt and a sodium salt to obtain a mixture, mixing the mixture with an organic acid solution, evaporating same to remove water, subjecting same to a heating reaction in an inert atmosphere, and subjecting the reacted material to acid pickling to obtain a nickel-cobalt-manganese-sodium mixed salt; and mixing the nickel-cobalt-manganese-sodium mixed salt, the ammonium-salt-modified carbon black and a binding agent, and compacting, drying and heating same to obtain a multimetal-carbon-based adsorbent. The prepared multimetal-carbon-based adsorbent in the present invention has specific adsorption capacities for sodium, ammonium radicals and sulfate radicals; the carbon black powder serving as a substrate carbon material can adsorb multiple ions such as calcium, iron, manganese and cobalt all at the same time, such that diversified adsorption is achieved; in addition, the adsorbent can be reused after a desorption treatment and has a repeat adsorption capacity.

A battery cell, its preparation method, battery, and power-consuming device are disclosed. The battery cell includes a positive electrode sheet, which comprises a positive current collector and a positive active material layer and a coating disposed on at least one surface of the positive current collector. The positive active material layer is disposed on the current collector, and the coating is disposed on the positive active material layer. The positive active material layer comprises sulfate ions, and the coating comprises a metal salt. The solubility product K of the inorganic salt formed by the sulfate ions and the metal cation of the metal salt is... sp ≤10 ‑6 The technical solution of this application is beneficial to reducing the sulfate ion content in the electrolyte of battery cells and improving the cycle performance of battery cells.

The application discloses a sulfate-based sodium battery positive electrode material, a preparation method and a sodium ion battery. The sulfate-based sodium battery positive electrode material has a composite sandwich structure and has the following general formula: Na2Fe 1+x (SO4) 2+x ·(MPO4) y C z ; wherein x is a sulfate excess coefficient, the value range of x is 0<=x<=1; y is a phosphate metering coefficient, 0.01<=y<=0.3; z is the mass fraction of carbon material, 1<=z<=5; M is selected from one or more of Mg, Ca, Al, Mn, Fe, Co, Ni, Cu, Zn, Ti or Zr; [MPO4] forms the core of the composite sandwich structure, [Na2Fe 1+x (SO4) 2+x ] forms the filling layer of the composite sandwich structure, and [C z ] is distributed at least in the interior of the composite sandwich structure to form the inner layer conductive framework of the composite sandwich structure. The application can fundamentally inhibit the iron ion disproportionation side reaction and the generation of impurities, and guarantee the high purity of the sodium ferric sulfate main crystal phase at the source of the synthesis reaction.

The purpose of the present invention is to provide, inter alia, an oil composition that comprises an aromatic edible oil and in which deterioration of the aroma of the aromatic edible oil is suppressed. The present invention relates to an oil composition that contains an aromatic edible oil and a sulfate and / or carbonate, wherein the sum total of the content of the sulfate in terms of sulfate ions and the content of the carbonate in terms of carbonate ions is 0.110 mg / mL or more.

The invention belongs to the technical field of marine polysaccharides, and relates to an anti-hypoxia urechis unicinctus body cavity fluid sulfated polysaccharide as well as a preparation method and application thereof. The weight-average molecular weight of the polysaccharide is 1000-50000 Da, the mass fraction of sulfate radicals is 10.0%-30.0%, and monosaccharide is prepared from galactose, ribose, fucose, glucosamine, mannose and glucose. The preparation method comprises the following steps: inducing controlled degradation of a main chain through high-temperature hot water extraction, carrying out proteolysis deproteinization, carrying out graded ethanol precipitation interception and carrying out anion exchange chromatography purification. The polysaccharide shows a remarkable protective effect in a nerve cell hypoxia simulation model, has excellent free radical scavenging activity, and can be used for preparing medicines, antioxidants, functional foods and the like for preventing or treating hypoxia-related diseases.

This invention relates to a process for treating acidic mine wastewater (AMD). The process includes the following steps: adjusting the pH of the AMD to a range of 3 to 5; adding magnetite nanoparticles to form a slurry; and a) aerating the slurry obtained in step 3), or b) simultaneously heating and mixing the slurry obtained in step 3). The magnetite nanoparticles loaded with one or more metals and sulfate ions and precipitated metals are then separated from the slurry.

This liquid quick-setting agent contains (A) smectite, (B) sulfate ions, (C) aluminum ions, and (D) water, and the mass ratio (A) / (B) of the content of the component (A) and the content of the component (B) is 3 or less.

The application belongs to the technical field of secondary batteries, and particularly relates to a preparation method of a double-fluorosulfonylimide alkali liquid salt. First, crude double-fluorosulfonylimide acid is added into a low-temperature melting and crystallization device for purification, and the purified double-fluorosulfonylimide acid is obtained through crystallization, sweating and other processes; then the purified double-fluorosulfonylimide acid is reacted with an alkali metal chloride salt in a good solvent at low temperature, and a double-fluorosulfonylimide alkali liquid salt is prepared by using positive pressure filtration. The moisture content of the liquid salt is within 15 ppm, the acidity is within 20 ppm, the chloride ion content is within 2 ppm, the sulfate ion content is within 5 ppm, the sulfamate ion is within 50 ppm, the fluoride ion content is within 12 ppm, and the purity of the liquid salt is above 99.6%. The preparation method of the liquid salt in the application is simple, has low energy consumption and high purity, is suitable for large-scale production, and can be adjusted according to the solvent type of the electrolyte, and is simple and efficient.