171 results about "SULFATE ION" patented technology

The invention discloses a cementing material for a solid waste-based road of a coal-fired power plant and a preparation method of the cementing material. The cementing material mainly comprises a cementing component, an alkali-activated component and a reinforcing component, the gelling component is a mixture of coal-fired power plant fly ash and furnace slag; the alkali-activated component is a mixture of alkali residues, red mud, blast furnace slag and coal-fired power plant desulfurized gypsum; the reinforcing component is rice hull ash or peanut hull ash. The mass ratio of the gelling component to the alkali-activated component is (4 / 1)-(10 / 1); and the addition amount of the reinforcing component is 1-3% of that of the main body material. The coal-fired power plant solid waste fly ash, the furnace slag and the desulfurized gypsum are used as main bodies, a small amount of other industrial solid waste is added, and the cementing material belongs to a full-solid-waste low-carbon cementing material and can be applied to a road base, a subbase or a base layer. The invention has the characteristics of low carbon emission, high solid waste consumption, simple production process and strong pavement performance, and in addition, the invention has a good stabilization effect on the problem that part of solid waste heavy metals and sulfate ions in a coal-fired power plant exceed the standard.

The invention discloses modified biogas residue-based hydrothermal carbon, a preparation method thereof and a dry digestion method for kitchen waste, and belongs to the technical field of waste organic matter recycling. The preparation method comprises the following steps: soaking biogas residues in a phosphoric acid solution to obtain pretreated biogas residues; mixing the pretreated biogas residues, transition metal salt, biochar loaded with vitamin B12 and water with the mass being 8-15 times that of the pretreated biogas residues, and performing hydrothermal reaction for 1-4 hours under the conditions that the temperature is 180-250 DEG C and the pressure is 1.5-4 MPa to obtain a hydrothermal product; and activating the hydrothermal product for 1-2 hours under the protective atmosphere of 300-400 DEG C to obtain the modified biogas residue-based hydrothermal carbon. The surface Fe-Cu composite oxide sequentially catalyzes and oxidizes H2S into elemental sulfur and sulfate ions, the vitamin B12-loaded biochar can promote MA directional proliferation, the sulfate ions can competitively inhibit SRB substrate uptake, the quantity ratio of MA to SRB is increased, and the methane production efficiency is effectively improved.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

The present application relates to the technical field of manganese industry wastewater treatment device, and particularly discloses a comprehensive treatment method for electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen, which comprises the steps of removing manganese, solid-liquid separation of manganese removal wastewater, adding a precipitant for precipitation reaction, etc.; according to the characteristics of electrolytic manganese production wastewater containing manganese, ammonia nitrogen, calcium, magnesium, sulfate ions, etc., by fully utilizing the magnesium ions in water, more than 95% of the manganese ions and all the phosphate radicals in water can be selectively removed by using slurry of quicklime, without introducing excessive calcium ions, effectively reducing the dosage of magnesium salt and phosphoric acid reagent, reducing the treatment cost, so that the electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen with ammonia nitrogen > 50 mg / L can be completely treated to reach the standard by using the ammonium magnesium phosphate precipitation method, and the indexes of manganese, ammonia nitrogen, phosphate radical and pH value after treatment can all reach the first standard limit value requirement of the Comprehensive Sewage Discharge Standard (GB 8978-1996), and the manganese, ammonia nitrogen and magnesium resources in the wastewater can be recovered.

The present application relates to the technical field of health, environmental management and resource development, and discloses an alkaline-sulfur oxidizing bacteria and its application in water pollution treatment and bioleaching. The alkaline-sulfur oxidizing bacteria is named 381-2, which has been preserved in the China General Microbiological Culture Collection Center on December 23, 2024, and the preservation number is CGMCC No. 33017; the microbial classification name is Stutzerimonas sp. The present application isolates a new species of Stizolobium strain from a deep-sea hydrothermal area Stutzerimonas sp. . The strain has strong and rapid oxidation ability of thiosulfate ions, and also has the characteristics of producing alkali, so it can be applied to the fields of water pollution treatment and bioleaching.

Methods for photocatalytic water splitting of produced waters may comprise introducing a photocatalyst comprising a semiconductor to a produced water comprising ions of sodium, chloride, calcium, magnesium, potassium, sulfate, barium, iron, lithium, strontium, or any combination thereof; in the presence of sunlight, allowing the photocatalyst to facilitate a reduction-oxidation reaction of a plurality of water molecules from the produced water; and obtaining hydrogen and oxygen.

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.

The invention relates to the field of combined application of MOF (Metal Organic Framework) crystal material synthesis and a sonodynamic antibacterial technology, in particular to an Eu-TCPP-SO4 crystal as well as a preparation method and application thereof. The rare earth-porphyrin complex Eu-TCPP-SO4 crystal with a specific crystal structure is constructed by virtue of coordination and self-assembly of europium nitrate pentahydrate, meso-tetra (4-carboxyl phenyl) porphyrin (TCPP) and sulfate ions. The Eu-TCPP-SO4 crystal disclosed by the invention as a sound-sensitive agent has high sound-sensitive activity and good stability, overcomes the limitations of low efficiency and poor stability of the sound-sensitive agent in the prior art, and can provide a safer and more effective solution for actual antibacterial application.

The invention belongs to the technical field of sewage treatment, and provides a filter material, a filter unit and a filter system.According to the filter material, the filter unit and the filter system for manganese ion-containing sewage treatment, a filter plate is provided with water through holes in the filter direction so that manganese-containing sewage can smoothly pass through the filter plate, and the filter plate is provided with water through holes in the filter direction; meanwhile, sufficient contact of sewage and filter plate materials is guaranteed, the forming direction of the water through holes is consistent with the sewage flowing direction, and sewage flowing resistance can be reduced. Through the synergistic effect of the porous structure of the adsorption foam concrete and various adsorption materials, synchronous and efficient removal of manganese ions and sulfate ions is realized, and the limitation of single pollutant treatment in the prior art is solved; due to the loose porous structure and reasonable raw material ratio, the adsorption efficiency is ensured, and the problem of secondary pollution caused by a chemical precipitation method is avoided; the material of the filter plate has adsorbability and structural strength, and is suitable for complex terrains and working conditions of multi-mountain mineral areas.

The invention discloses a green liquid salt and a production process thereof, and relates to the technical field of liquid salts.The production process comprises the steps that a metal organic framework is taken and added into a Tris-HCl buffer solution, uniform mixing is conducted, dopamine hydrochloride is added, stirring, centrifuging, washing and drying are conducted, and the metal organic framework of a core-shell structure is obtained; the preparation method comprises the following steps: adding sulfonated polysulfone, a core-shell structure metal organic framework and polyvinylpyrrolidone into N-methyl pyrrolidone, stirring until the materials are completely dissolved, and carrying out ultrasonic treatment to obtain a membrane casting solution; taking the membrane casting solution, pouring on a glass plate, and performing blade coating, water bath, phase inversion and soaking to obtain a nanofiltration membrane; taking brine, adding modified charcoal, adsorbing, and performing ultrafiltration through an ultrafiltration membrane to obtain ultrafiltration filtrate; and carrying out nanofiltration on the ultrafiltration filtrate through a nanofiltration membrane to obtain liquid salt. Sulfonic acid groups introduced into the nanofiltration membrane are negatively charged, and the interception rate of the nanofiltration membrane on sulfate ions, calcium ions and magnesium ions is improved through electrostatic interaction and size screening.

The application discloses a method for removing impurities from a lithium-containing solution, application and system thereof, and belongs to the technical field of lithium ion battery materials. The method provided by the application comprises the following steps: reacting the lithium-containing solution with a calcium compound, and then performing solid-liquid separation; the calcium compound comprises at least one of calcium oxide and calcium hydroxide; the lithium-containing solution further contains magnesium ions and sulfate ions; and the mass ratio of the one with a larger amount in the magnesium ions and the sulfate ions to the calcium compound is 1:1.05-1.3. The method provided by the application can remove most of calcium, magnesium and sodium impurities in the lithium-containing solution through one-step method, and the impurity removal step is simple and low in cost. The application also provides application of the method and a system for implementing the method.

The invention provides a coastal environment salt mist corrosive component concentration intelligent detection system, which comprises a dust removal device, a filter chamber, an air outlet mechanism and a control system, and a salt mist collection device can collect salt mist particles in air passing through the dust removal device into a monitoring device; the monitoring device can monitor the weight of salt mist particles in air flowing through the filter chamber and the content of internal components, and comprises a salt mist dissolving device, a component detection device and a bottom plate; the component detection device comprises a chloride ion detection box, a second gravity sensor, a first water pipe, a second water pipe, a first water pump, a second water pump, a transfer box and a third gravity sensor, and the weight of sulfate ions is obtained by subtracting the weight of chloride ions measured by the second gravity sensor from the weight of salt mist particles measured by the first gravity sensor; therefore, the corrosive components in the salt mist can be intelligently classified and analyzed, and protection measures are specifically applied to the concrete structure.

The invention relates to the technical field of corn soaking water treatment, in particular to a process method for preparing two liquid protein products and recovering potassium chloride by taking corn soaking water as a raw material, which comprises the following steps: adsorbing supernate obtained by standing and settling the corn soaking water by using a resin column, filtering collected effluent, concentrating collected filtrate, and concentrating the concentrated filtrate. Respectively collecting a concentrated solution and a permeate solution; carrying out vacuum concentration on the collected concentrated solution, cooling, carrying out suction filtration, respectively collecting a filter cake and a filtrate, combining the collected filter cake with a leacheate obtained by leaching the filter cake, carrying out concentration treatment, adding ethanol, cooling, and carrying out suction filtration, so as to obtain the collected filtrate, namely a first liquid protein product; and concentrating the collected permeate, adding ethanol, stirring, cooling, carrying out suction filtration, and drying the collected filter cake to obtain the potassium chloride product. According to the process method, the first liquid protein product and the second liquid protein product which are low in magnesium ion content and sulfate ion content can be obtained, and potassium chloride is recycled.

Relates to a positive active material and a preparation method thereof, a positive pole piece, a battery and electric equipment, the positive active material comprises Na4-aAbFe3-cBd (PO4) 2-eDf (P2O7), A comprises at least one of Li or K, B comprises a metal element, D comprises at least one of halogen anions, silicate ions, sulfate ions or borate ions,-0.12 < = a < = 0.12, b > = 0, 0 < = c < = 0.3, d > = 0, f > 0, and 0 < e < = 0.1.

This invention discloses a method for preparing organic sulfates, comprising the following steps: using persulfate as the sulfate source, and achieving the functional group transformation of a free radical precursor compound through the free radical anion of the sulfate ion, thereby preparing the organic sulfate. This invention uses persulfate as the source and, through a free radical addition mechanism, acts on the free radical precursor substrate. Persulfate, as a sulfate free radical anion, participates in the functional group transformation of the organic compound, resulting in the efficient synthesis of organic sulfates.

The wastewater treatment system according to an embodiment of the present invention is used for treating wastewater containing a sodium sulfate solution, and comprises: an electrodialysis device for separating the sodium sulfate solution of the wastewater into a first solution containing sulfate ions, a second solution containing sodium ions, and circulating wastewater from which sodium sulfate has been removed; a first membrane distillation device that extracts purified water from the first solution in order to concentrate the first solution; and a second membrane distillation device that extracts purified water from the second solution in order to concentrate the second solution. According to the wastewater treatment system disclosed by the embodiment of the invention, salt compounds and other harmful ions in the wastewater can be selectively separated through the electrodialysis device so as to effectively separate a high-concentration ionic solution. Therefore, not only can substances after wastewater treatment be recycled to the maximum extent, but also the environmental harmfulness of salt compounds can be greatly reduced.

A process method for flue gas desulfurization wastewater zero discharge treatment, comprising a pretreatment section, a concentration section and a salt separation section; the pretreatment section comprises a hardness removal adjusting tank, a heavy metal removal tank, a coagulation sedimentation tank, an aeration biochemical tank, an ozone catalytic oxidation device, a sludge concentration and dehydration unit and a sludge drying unit; the concentration section comprises a tubular microfiltration, a medium-high pressure reverse osmosis, a low pressure reverse osmosis, an electrodialysis and a biological reactor; the salt separation section comprises a nanofiltration I, a nanofiltration II, a nitrate crystallizer and a salt crystallizer; wherein the electrodialysis adopts a modified anion exchange membrane, which is modified by a polyanion modifier and beta-cyclodextrin together, so that the anti-pollution ability of the membrane is greatly increased, and the selective permeability of sulfate ions is increased; in the process method, the wastewater is not only zero discharged, but also high-purity sodium chloride and sodium sulfate are obtained, and the process method has the advantages of mild operation condition, simple operation, low energy consumption and the like.

The utility model belongs to the field of water treatment, and particularly relates to a wastewater hardness removal system for nanofiltration coupling induced crystallization. The wastewater hardness removal system comprises a nanofiltration unit, a gypsum reactor and an ettringite reactor. Wherein the nanofiltration unit is configured to add a scale inhibitor into the wastewater, so that calcium ions and sulfate ions are supersaturated, and divalent salt is intercepted, so that the divalent salt is enriched on a nanofiltration concentrated water side; the gypsum reactor is communicated with a nanofiltration concentrated water liquid outlet of the nanofiltration unit and is configured to add an agent for destroying a scale inhibitor, so that calcium ions and sulfate ions are combined to produce calcium sulfate crystals; the ettringite reactor is communicated with the liquid outlet of the gypsum reactor, and is configured to add alkali and aluminum salt, further remove hardness of the liquid discharged from the gypsum reactor, and produce ettringite. Therefore, the consumption of the chemical agent is low, the subsequently added sodium carbonate can be reduced, meanwhile, the increase of ion concentration caused by adding the chemical softening agent is reduced, and the treatment pressure of a subsequent water treatment system is reduced.

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.

The present application relates to a lithium extraction method from sulfate-type salt lake brine, comprising the following steps: step 1, dividing the sulfate-type salt lake brine to be treated into several portions; step 2, performing first nanofiltration treatment on one portion of the sulfate-type salt lake brine, collecting first concentrated water and first dilute water; step 3, mixing the first concentrated water and a chlorine salt solution, performing second nanofiltration treatment, and collecting second dilute water; step 4, mixing the first dilute water and the second dilute water, performing third nanofiltration treatment, and collecting third concentrated water and third dilute water; step 5, mixing the third concentrated water and another portion of the sulfate-type salt lake brine, repeating steps 2-4 until the mass percentage of sulfate ions in the third dilute water accounts for less than or equal to 10% of the total anions, and the concentration of lithium ions is between 0.05 g / L and 5 g / L; and step 6, extracting lithium ions in the third dilute water obtained in step 5 by using an adsorption method. The above method can overcome the difficulty of low adsorption capacity of adsorbents for lithium ions in the original brine, and improve the applicability of the adsorption method in lithium extraction from sulfate-type salt lake brine.

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.

The invention discloses a reverse osmosis membrane front crystal nucleus inhibition device which comprises a pH adjusting mechanism, a calcium sulfate crystallization reactor, a crystal separation mechanism and an adjusting mechanism which are sequentially arranged in the water flow direction, and the pH adjusting mechanism comprises a metering and adding device and an ultrasonic disperser which are sequentially arranged in the water flow direction; the calcium sulfate crystallization reactor is arranged beside the ultrasonic disperser, a stirring mechanism is arranged in the calcium sulfate crystallization reactor, concentration sensors are arranged at an inlet and an outlet of the calcium sulfate crystallization reactor respectively and used for monitoring calcium ions and sulfate ions, and the crystal separation mechanism comprises a microfiltration membrane assembly and a filter. The microfiltration membrane assembly is connected with an outlet of the calcium sulfate crystallization reactor and used for receiving a solid-liquid mixture, the filter is connected with the microfiltration membrane assembly, and the adjusting mechanism comprises a controller, a front online pH sensor array, a rear online pH sensor array and a concentration sensor. The controller is electrically connected with the front on-line pH sensor array, the rear on-line pH sensor array, the concentration sensor, the ultrasonic disperser, the metering and adding device and the stirring mechanism. The device for inhibiting the crystal nucleus in front of the reverse osmosis membrane has the advantages of eliminating scaling on the membrane surface and improving the recovery rate of raw water.

The invention provides a road alkali residue engineering soil curing agent and an alkali residue engineering soil material cured by the curing agent, and belongs to the technical field of comprehensive utilization of alkali residue engineering soil. The curing agent provided by the invention comprises a gelling component and an alkali excitation component, the curing agent is used for curing the alkaline residue engineering soil, the mechanical strength of the alkaline residue engineering soil is remarkably improved, and the leaching concentration of chloride ions and sulfate ions is reduced. The curing agent can effectively improve the pavement performance and environmental safety performance of the alkaline residue engineering soil, and solves the problem that the alkaline residue engineering soil is difficult to be used as a road filler.

The present invention relates to: [1] a method for manufacturing silica microcapsules, the silica microcapsules having a shell containing silica as a constituent component and a core containing one or more organic compounds, the manufacturing method comprising the following steps: in the presence of one or more sulfur-containing ions selected from sulfate ions, sulfite ions and sulfonic acid ions, an emulsion is supplied to a sol-gel reaction to form silica microcapsules, wherein the emulsion is obtained by emulsifying an aqueous phase component containing a cationic surfactant and an oil phase component containing one or more organic compounds and a silica source; [2] an aqueous dispersion containing silica microcapsules, the silica microcapsules having a shell containing silica as a constituent component and a core containing one or more organic compounds, the total content of sulfate ions, sulfite ions and sulfonic acid ions in the aqueous dispersion being 10 to 500 ppm.

The invention provides a method for separating magnesium and lithium in brine, which comprises the following steps: pretreating the brine to prepare pretreated brine; carrying out primary nanofiltration, secondary nanofiltration and reverse osmosis concentration on the pretreated brine; a nanofiltration membrane selected by the first-stage nanofiltration is a carboxylated MOF (Metal Organic Framework) modified nanofiltration membrane; the carboxylation modified nanofiltration membrane is prepared from the following raw materials: a support body, piperazine, carboxylation ZiF-8 and carboxylation Uio-66. According to the method, brine is pretreated, so that the risk of pollution of the brine to a nanofiltration membrane is reduced, the pretreated brine is pumped into a nanofiltration system, and trapped fluid enriched with magnesium and sulfate ions and high-lithium permeate liquid are generated; the trapped fluid is subjected to secondary nanofiltration to recover lithium, the secondary trapped fluid can be subjected to resource utilization, the permeate liquid enters a reverse osmosis membrane to concentrate the lithium content, and the concentrated lithium liquid enters a lithium precipitation process; magnesium and lithium are separated in the nanofiltration process, and meanwhile, the impurity removal process of lithium recovery is realized.

The application discloses a preparation method of a functional material with the functions of chlorine fixation and cement hydration promotion, and belongs to the field of building material manufacturing.The application is aimed at solving the problems that the high content of LDH affects the mechanical properties of cement-based materials, and that sulfate ions and carbonate ions compete with chlorine ions for adsorption and displace the adsorbed chlorine ions.The method comprises the following steps: stirring a certain volume of ethanol and ammonia water in a water bath, adding TEOs to obtain solution A;mixing ethanol and deionized water, adding LDH, and ultrasonic dispersing for ten minutes to obtain solution B;pouring solution B into solution A, filtering and drying, drying, grinding into powder, and heating at 500 DEG C for 5 hours to further grind, so as to obtain the functional material.The composite material prepared by the method has better dispersity, the adsorption performance of chlorine ions is promoted, the negative influence of CLDH on the mechanical properties of cement can be offset, and the release of chlorine ions in the LDH can be prevented to a certain extent.

A method for treating fluorinated water, comprising: adding a flocculant to a dispersion liquid containing calcium fluoride and water to obtain a suspension liquid containing calcium fluoride aggregates and water; allowing the calcium fluoride aggregates to settle in the suspension liquid containing calcium fluoride aggregates and water, separating into a supernatant and deposits; adding a liquid containing calcium ions and a portion of the separated deposits to a liquid containing fluoride ions and water to precipitate calcium fluoride in the presence of sulfate ions to obtain the dispersion liquid containing calcium fluoride and water;and adjusting the amount of sulfate ions, upon adding the calcium ion-containing liquid and the portion of the separated deposits to the liquid containing fluoride ions and water, to no more than 35% by mass relative to the amount of fluorine element contained in the liquid containing fluoride ions and water, and adjusting the concentration of sulfate ions in the supernatant to 100 mg / l or more. A device for treating fluorinated water, designed to carry out the process.

This invention belongs to the field of wastewater treatment, specifically relating to a method for deep denitrification of wastewater via autotrophic denitrification. Modified sulfur and sodium thiosulfate are used as electron donors, and an adsorbent is used to adsorb sulfate ions. A sulfur solution is used as the solvent phase; oligodextrose and polyethylene glycol are dissolved in water as the antisolvent phase; the antisolvent phase and solvent phase are mixed, ultrasonically dispersed, and dried to obtain modified sulfur; silica is loaded onto the surface of hydrotalcite, etched with organic acid, and heat-treated to obtain the adsorbent. The method of this invention yields elemental sulfur with higher solubility and dispersion, less loss, and effective adsorption of sulfate ions. It achieves good denitrification effect with a shorter hydraulic retention time and low denitrification cost.

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.