423 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 provides a method, a device and equipment for predicting corrosion current and corrosion of steel bars in concrete in a low-pressure environment, and belongs to the technical field of engineering simulation modeling. The method comprises the following steps: establishing a coupling transmission model in concrete considering oxygen concentration, sulfate ion diffusion behavior and chloride ion diffusion behavior; building a reinforcement corrosion current density and corrosion depth prediction model for predicting the number of charges at different positions of the reinforcement in the concrete, and calculating the corrosion depth and the corrosion product content based on the corrosion current density; and establishing a linear elastic damage model for simulating concrete damage evolution caused by steel bar corrosion according to the corrosion product content output by the steel bar corrosion current density prediction model so as to realize accurate prediction of corrosion and damage. According to the method, oxygen concentration changes under low air pressure are considered, oxygen diffusion is described, output of a transmission model serves as a dynamic variable to be introduced into the corrosion current calculation process, and the accuracy of corrosion current and steel bar corrosion prediction is improved.

The invention relates to a micro-nano aggregate based on silanized calcium sulfate whisker in-situ polymerization, the main component of the micro-nano aggregate is acrylate copolymerized CSW / NS-GO, and the preparation method comprises the following steps: loading nano silicon dioxide on the surface of calcium sulfate whisker to obtain CSW / NS; carrying out silanization modification on CSW / NS; preparing graphene oxide by a Hummers method; and carrying out in-situ polymerization to prepare the acrylate copolymerized CSW / NS-GO. Calcium sulfate whiskers are loaded and bonded with epoxy modified nano silicon dioxide and then subjected to in-situ polymerization with graphene oxide in an acrylic monomer, a polymer chain is tightly combined with a functional group of CSW / NS-GO, good interface bonding is formed, and the strength and toughness of the composite material are improved. The acrylate copolymerized CSW / NS-GO has a microscopic three-dimensional network structure and excellent stability, so that the internal structure of the concrete is more compact, the porosity is reduced, the permeation of water is prevented, and the invasion of harmful substances such as chloride ions and sulfate ions into channels is reduced, thereby reducing the structural damage caused by environmental factors such as dry-wet cycle and freeze-thaw cycle; the durability of the concrete is improved.

The invention discloses space-time process simulation of concrete sulfate erosion concentration based on an NAS-PINN-GPR algorithm. The space-time process simulation comprises the following steps: determining a control equation of a sulfate erosion process and collecting sample data; optimizing the PINN structure by using a neural architecture search (NAS) technology; setting a loss function of the PINN according to the control equation, the sample set, the boundary condition and the initial value condition; according to the loss function, training the optimized PINN structure based on the sample set, and simulating the time-space process of the concrete sulfate erosion concentration by using the trained PINN structure to obtain sulfate ion concentration point prediction; the trained PINN structure generates sufficient prediction data as training data of a Gaussian process regression (GPR) algorithm, and a trained GPR model is utilized to simulate and predict an uncertainty probability interval of the concrete sulfate erosion concentration. According to the method, the PINN algorithm and the GPR algorithm are combined, reliable interval estimation is provided on the basis of obtaining high-precision sulfate ion concentration point estimation, and the prediction capability of the model is improved.

The invention discloses a deep fluorine removal agent and application thereof in wastewater in the photovoltaic industry, and belongs to the technical field of fluorine-containing wastewater treatment.The deep fluorine removal agent is obtained by conducting coordination on cross-linked hybrid chitosan microspheres and lanthanum ions to obtain composite microspheres and then synthesizing zirconium-based MOF on the composite microspheres through a hydrothermal synthesis method. The pore channels of the MOF facilitate the passing of fluorine ions but not the passing of sulfate ions, play a certain barrier role, facilitate the enrichment of the fluorine ions on the surfaces of the composite microspheres and the selective adsorption of the lanthanum ions on the fluorine ions, so that the fluorine ions are fixed, and the combination stability of the fluorine ions and the lanthanum ions is greater than that of the sulfate ions. The sulfate ions are in disadvantage when competitive adsorption with the fluorine ions, the selectivity of the deep fluorine removal agent to the fluorine ions is improved, the magnesium ions can be combined with the fluorine ions to generate complexes and can be combined with the sulfate ions to generate soluble magnesium sulfate, and interference of the sulfate ions is reduced through cooperation of the magnesium ions and the sulfate ions.

The invention relates to the technical field of concrete crack repairing agents, in particular to a triggered precipitation type concrete crack repairing agent as well as a preparation method and application thereof. The repairing agent is prepared from the following raw materials: sulphoaluminate cement, nano anhydrite with a core-shell structure, fluorine-phosphorus composite seed crystal, magnesium oxide, metakaolin and a water reducing agent, wherein the core-shell structure nano anhydrite is prepared by coating mesoporous silica with nano anhydrite, and the fluorine-phosphorus composite seed crystal is prepared from calcium fluoride and monocalcium phosphate through a hydrothermal reaction. According to the trigger precipitation type concrete crack repairing agent prepared by the invention, sulfate ions are slowly released through the core-shell structure nano anhydrite, the crystal form of ettringite is regulated and controlled through the fluorine-phosphorus composite seed crystal, the problems that a traditional repairing agent shrinks and falls off in the later period, the high-temperature strength is suddenly reduced, and the binding power is insufficient are solved, and the trigger precipitation type concrete crack repairing agent is suitable for concrete structure crack repairing and high-temperature environment engineering.

The invention relates to a method for extracting lithium from a salt lake and synchronously removing silicon and boron. The method comprises the following steps: pre-treating and filtering lithium-containing brine; carrying out reverse osmosis concentration treatment to concentrate lithium to be more than 2.5 g / L; carrying out nanofiltration treatment to remove magnesium, calcium and sulfate ions; treating by adopting an electrodialysis system to obtain a high-silicon and high-boron desalted solution and a low-silicon and low-boron lithium concentrated solution; the low-silicon and low-boron lithium concentrated solution is treated with chelating resin and boron removal resin, so that magnesium and calcium ions are smaller than or equal to 2 mg / L, boron is smaller than or equal to 20 mg / L, and the refined lithium concentrated solution is obtained; concentrating by an evaporation system, adding a precipitant, precipitating, filtering, washing, crushing and demagnetizing to obtain a low-silicon low-boron battery-grade lithium carbonate product. The invention further discloses a system for extracting lithium from the salt lake and synchronously removing silicon and boron, the complex and low-efficiency boron removal and silicon removal nanofiltration process is adopted, and concentration of lithium and efficient removal of silicon and boron are synchronously achieved; silicon scaling pollution caused by membrane separation and heat exchanger tube nests is avoided, and deep removal of silicon and boron is realized.

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.

A use method of the test device for simulating ion erosion of the PCCP protective layer comprises the following steps: S1, region division: selecting a test object, and firstly dividing the test object into four regions, namely a region I, a region II, a region III and a region IV; dividing each subarea into three test areas, namely a test area A, a test area B and a test area C; s2, making a test plan: executing sulfate ion erosion comparison in a partition I, executing chloride ion erosion comparison in a partition II, executing protective measure comparison in a partition III, and executing a mixed comparison test in a partition IV; s3, making a comparison scheme; s4, making a dry-wet cycle scheme; s5, preparing test conditions; s6, liquid filling is executed; s7, executing a dry-wet cycle; s8, judging whether the dry-wet cycle needs to be ended or not: if Seq is equal to L, ending the dry-wet cycle, and continuing S9; otherwise, indicating that all times of dry-wet cycle treatment is not completed, and returning to S6; s9, extracting a sample; and S10, analyzing a result.

The utility model discloses a slaked lime powder on-line feeding and efficient magnesium removal and desulfurization reaction device which comprises a dissolution reaction tank, a slaked lime feeding assembly, a reaction flocculation tank, an overflow pipe, a liquid level meter and a frequency conversion material transfer pump. A water inlet pipe and a powder feeding opening are formed in the top of the dissolving reaction tank; the slaked lime adding assembly is used for adding slaked lime powder into the dissolving reaction tank; the reaction flocculation tank is communicated with the dissolution reaction tank through an overflow port, a feed liquid discharge port is formed in the bottom, and a flocculant filling port and a coagulant aid filling port are formed in the top; the bottom of the overflow pipe extends below the liquid level of the dissolving reaction tank, the top of the overflow pipe is communicated with the overflow port, and the liquidometer is used for monitoring the liquid level value of the reaction flocculation tank in real time; and the variable-frequency transfer pump is used for performing variable-frequency adjustment according to the liquid level value monitored by the liquid level meter. According to the utility model, the problem that only low-concentration magnesium ions, sulfate ions and desulfurization wastewater of suspended matters can be treated by the existing triple box treatment process is solved, and the automation degree is improved.

The invention provides a novel D-A-D type fluorescent probe material as well as a preparation method and application thereof. The fluorescent probe material has good stability, the preparation process is simple, and the synthesis condition is mild. Moreover, the D-A-D type fluorescent probe material has good solubility and stability, and a complex of the D-A-D type fluorescent probe material and zinc ions can identify pyrophosphate ions with high selectivity and high sensitivity. The interference of phosphate ions, hydrogen phosphate ions, dihydrogen phosphate ions, fluorine ions, chloride ions, nitrate ions, acetate ions, sulfate ions and carbonate ions is avoided; after the zinc ion complex of the D-A-D type fluorescent probe material is combined with PPi, the fluorescence intensity is remarkably enhanced, the D-A-D type fluorescent probe material has a higher signal-to-noise ratio, in-situ imaging detection of a target object in living cells or tissues is realized, the defects of a traditional molecule and ion detection method are overcome, and the D-A-D type fluorescent probe material is suitable for being widely applied to the field of biological imaging. # imgabs0 #

The invention provides a method for recycling battery-grade manganese sulfate from manganese-containing feed liquid. The method comprises the following steps: (1) carrying out resin adsorption on a manganese-containing feed liquid to obtain a nickel-cobalt adsorbate and an adsorbed feed liquid; (2) sequentially carrying out extraction treatment and reverse extraction treatment on the adsorbed feed liquid to obtain a solution containing manganese sulfate and an organic phase after reverse extraction; (3) carrying out evaporative crystallization on the solution containing manganese sulfate to obtain battery-grade manganese sulfate; positive ions in the manganese-containing feed liquid comprise manganese ions, nickel ions, cobalt ions, calcium ions and magnesium ions, and negative ions in the manganese-containing feed liquid comprise sulfate ions; an extraction agent adopted in the extraction treatment process comprises an HBL116 extraction agent. According to the method disclosed by the invention, metal oxidation hydrolysis cannot be caused to generate a third phase, the extraction process is stable, enrichment of a high-concentration manganese sulfate solution is realized, high-purity manganese sulfate crystals with qualified impurities are obtained, and efficient recovery of manganese in a high-calcium-magnesium feed liquid system can be realized; and a complicated recovery process is not needed, so that the cost is lower.

The invention discloses a wastewater treatment and recovery process in the production process of a layered oxide positive electrode material of a sodium-ion battery, and belongs to the field of environmental protection, the wastewater treatment and recovery process comprises the following steps: S1, respectively carrying out pH regulation on mother liquor and washing water, and respectively carrying out MF microporous filtration on the mother liquor and the washing water after pH regulation; s2, the filtered mother liquor and washing water are subjected to pH adjustment respectively, and the mother liquor and washing water subjected to pH adjustment are subjected to UF ultrafiltration respectively; s3, carrying out first-stage RO membrane treatment on the washing water UF produced water subjected to UF ultrafiltration; carrying out second-stage RO membrane treatment on mother liquor UF produced water and first-stage RO concentrated water after UF ultrafiltration; s4, carrying out resin defluorination on the concentrated water treated by the second-stage RO membrane; the produced water after the second-stage RO membrane treatment is returned to the first-stage RO membrane treatment in the step S3; and S5, treating the wastewater subjected to resin defluorination through a bipolar membrane, and recovering to obtain sodium hydroxide and sulfuric acid, so that the problem that sodium ions and sulfate ions cannot be recovered in the prior art is solved.

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 invention provides a BDO (1, 4-butanediol) wastewater treatment process with high sulfate content, which comprises the following steps: carrying out electrochemical oxidation treatment on BDO (1, 4-butanediol) wastewater with high sulfate content; introducing the obtained BDO wastewater into an anaerobic reaction device for anaerobic reaction to reduce sulfate ions into hydrogen sulfide and oxidize organic matters to reduce COD (Chemical Oxygen Demand); effluent sequentially flows back to the circulating desulfurization device and the air floatation device; carrying out aeration treatment in the circulating desulfurization device so as to oxidize hydrogen sulfide into elemental sulfur; elemental sulfur is recycled in the air flotation device, and part of effluent of the air flotation device and part of effluent of the anaerobic reaction device flow back to inlet water of the anaerobic reaction device; part of effluent of the air floatation device and part of effluent of the anaerobic reaction device are combined and then are sequentially introduced into an aerobic activated sludge tank with a membrane bioreactor and an ozone catalytic oxidation tank. Effluent can enter a subsequent ultrafiltration reverse osmosis membrane system to be purified, and water produced by the membrane system is recycled as reclaimed water.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a supported electrolyte of all-vanadium redox flow battery positive and negative electrolyte and a preparation method thereof, and the supported electrolyte comprises an aqueous solution containing vanadium ions, sulfonate ions, sulfate ions and phosphonic acid groups. The sulfonic acid group (-SO3H) has strong polarity and high ionization degree, after the sulfonic acid group (-SO3H) is mixed with the phosphonic acid group (-PO3H2) and sulfuric acid, the ionic environment of the electrolyte can be optimized, the activation energy of V (II) / V (III) and V (IV) / V (V) electricity on electron transfer is reduced, and compared with an existing sulfuric acid supported electrolyte, the reversibility of electrochemical reaction is remarkably improved, and the electrochemical activity of the electrolyte is enhanced; meanwhile, phosphonic acid groups have high complexing ability, can form stable chelates with vanadium ions and can form complexing-dispersing synergy with sulfonic acid groups, the solubility of the vanadium ions is improved, and agglomeration and crystallization of the vanadium ions are inhibited.

Provided are a positive electrode active material and a preparation method therefor, a positive electrode sheet, a battery, and an electric device. The positive electrode active material comprises Na4-aAbFe3-cBd(PO4)2-eDf(P2O7), wherein A comprises at least one of Li and K, B comprises a metal element, D comprises at least one of a halogen anion, a silicate ion, a sulfate ion, or a borate ion, -0.12≤a≤0.12, b≥0, 0≤c≤0.3, d≥0, f>0, and 0<e≤0.1.

The invention discloses a carbon quantum dot material as well as a preparation method and application thereof, and particularly relates to the field of battery materials. Comprising the following steps: placing terephthalaldehyde and p-trifluoromethyl cyanophenyl acetonitrile in a sodium methoxide solution for hydrothermal reaction to obtain a carbon quantum dot material; mixing PAN powder with DMF (Dimethyl Formamide) to obtain a PAN spinning solution; dispersing the carbon quantum dot material in the PAN spinning solution to obtain a mixed spinning solution; and spinning the mixed spinning liquid on the surface of the zinc foil in an electrostatic spinning manner to obtain the modified zinc foil. The carbon quantum dot material rich in various types of zinc-philic functional groups is synthesized through a hydrothermal method strategy, the surface electric field distribution of zinc metal can be improved, then the zinc ion deposition and nucleation process is homogenized, zinc dendrite formation is avoided, the modified zinc foil serves as the negative electrode material of the water-based zinc ion battery, and the service life of the water-based zinc ion battery is prolonged. The carbon quantum dot material with rich electronegative functional groups can repel sulfate ions in the electrolyte, so that the formation of byproducts is inhibited.

The invention belongs to the technical field of heat-engine plant unit circulation component surface corrosion prevention, and discloses a high-temperature-corrosion-resistant coating material, a coating and a preparation method and application thereof.The preparation method comprises the steps that by mass, 10%-20% of Cr, 1%-5% of Ni, 2%-10% of Fe, 10%-30% of molybdenum, 20%-40% of copper and 10%-20% of silicon are mixed to be uniform, a pipeline is embedded, heat treatment is conducted, and an initial chromium-rich infiltrated layer is formed; and then nitriding treatment is conducted on the initial chromium-rich nitriding layer, and the high-temperature-corrosion-resistant chromium-nitrogen composite coating is formed. The added silicon can form silicides in the coating, and the silicides can prevent the corrosion medium from permeating, so that the corrosion process is slowed down or prevented; the added molybdenum can effectively improve the stability of the composite coating in a corrosion medium rich in sulfate ions; and the added copper can form a protective layer consisting of copper sulfide or copper oxide on the surface of the steel, so that the corrosion of a corrosive medium is effectively prevented.

The invention provides a process for recovering sodium sulfate, sodium carbonate and glaserite in alkali ash and removing chloride ions. The process specifically comprises the following steps: dissolving the alkali ash; sodium sulfate and sodium carbonate in the alkali ash solution are separated through hot crystallization; cooling, crystallizing and separating glaserite in the alkali ash solution; sulfate ions and carbonate ions in the alkali ash solution are separated from chloride ions; and further separating sodium sulfate, sodium carbonate, glauberite and the like in the alkali ash solution. Meanwhile, the invention provides a system for implementing the process. The system comprises an alkali ash dissolving unit, a main crystallization unit, a glaserite crystallization unit, a nanofiltration unit and other elements. According to the process and the system provided by the invention, on one hand, sodium sulfate and sodium carbonate in the alkali ash solution can be extracted, glaserite can be extracted at the same time, chloride ions in the solution are removed at the same time, and the discharge amount of mother liquor is reduced.

The invention relates to the technical field of natural polymer material processing, in particular to a high-strength cellulose membrane and a preparation method thereof.The preparation method comprises the following steps that a solvent is prepared from an alkaline aqueous solution and a stabilizer to dissolve cellulose, and a cellulose solution is obtained after filtering and defoaming; the cellulose solution is regenerated in a salting-out bath after being extruded through a slit, and a carbonate solution or a mixed salt solution of carbonate and sulfate is selected as the salting-out bath; and washing, drafting and drying the regenerated product to obtain the high-strength cellulose membrane. Carbonate and sulfate ions in the salting-out bath can polarize hydrated water molecules around cellulose molecular chains, destroy hydrogen bond interaction between the cellulose molecular chains and water and water molecules and interfere hydrophobic interaction of the cellulose molecular chains, so that the water molecules are discharged from the cellulose molecular chains; the interaction among hydroxyl groups on a cellulose skeleton is enhanced, compact and uniform nanofibers are formed, and the mechanical property of the film is remarkably improved.

The utility model belongs to the technical field of strong brine treatment, and particularly relates to a treatment device for removing sulfate radicals in water through combination of membrane concentration and a calcium sulfate crystallization device, the input end of the calcium sulfate crystallization device is provided with a raw water inlet, and the output end of the calcium sulfate crystallization device is connected with a drainage pipe. According to the utility model, high-concentration calcium ions and sulfate ions in high-salinity raw water can be precipitated through the calcium sulfate crystallization device, suspended matters generated by calcium sulfate crystallization are removed through the filtration treatment device, output filtered produced water enters the membrane concentration device, concentrated water is separated by utilizing the salt separation effect of the membrane concentration device, and the concentrated water is recycled. And then the membrane concentration concentrated water is introduced into the calcium sulfate crystallization device through the concentrated water discharge pipe, so that the effect of removing sulfate radicals from the membrane concentration concentrated water is realized, and the investment cost can be saved.

The present application discloses a method and device for determining the reaction intensity of TSR in a reservoir, which belongs to the technical field of oil and gas reservoirs. The method comprises: obtaining sulfate ions SO4 in the formation water of the target reservoir; 2‑ The concentration of chloride ions Cl ‑ Calculate the concentration of SO4 in the formation water of the target reservoir 2‑ The concentration value and Cl ‑ The ratio of the concentration values ​​of SO4 in the formation water of the target reservoir; 2‑ The concentration value and Cl ‑ The reaction intensity of the thermochemical sulfate reduction reaction TSR in the target reservoir is determined by the ratio of the concentration values ​​of . The present application can more accurately determine the reaction intensity of the TSR in the reservoir.

The invention provides a treatment method and a treatment system for high-salinity mine water, and belongs to the technical field of mine water treatment. The treatment method comprises the following steps: S1, filtering and separating the high-salinity mine water through a filtering unit to remove suspended matters, so as to obtain filtered produced water; s2, the filtered produced water is subjected to nanofiltration separation through a nanofiltration unit, and nanofiltration concentrated water rich in divalent salt and nanofiltration produced water rich in monovalent salt are obtained; s3, introducing the nanofiltration concentrated water into a first reactor, and adding an agent to remove magnesium ions in the nanofiltration concentrated water, so as to obtain first produced water containing calcium ions and sulfate ions; the medicament comprises a softening agent; s4, introducing the first produced water into a second reactor, and enabling calcium ions and sulfate ions in the first produced water to react to obtain second produced water and calcium sulfate dihydrate; and returning the second produced water to the filtering unit for continuous treatment. The technological process has the advantages of being easy and convenient to operate, small in occupied area, low in system operation cost and the like.

The invention belongs to the technical field of recycling of lithium precipitation mother liquor, and particularly relates to a lithium carbonate separation process for freezing, evaporating, thermally crystallizing and decarburizing liquid after lithium precipitation, which is technically characterized by comprising the following operation steps: evaporating impurity-removed lithium liquid to precipitate lithium for the first time; freezing liquid after lithium precipitation to separate sodium sulfate; carrying out heating crystallization on the frozen filtrate, and simultaneously evaporating a part of water to obtain lithium carbonate crystals and crystallized filtrate; decarburization; performing evaporation; depositing lithium for the second time; the secondary lithium precipitation solution and the decarbonized solution are mixed and jointly enter an evaporation process; the lithium-containing solution comprises sulfate ions, sodium ions, potassium ions and lithium ions; the lithium-containing solution comprises sulfate ions, sodium ions, potassium ions and lithium ions. According to the method, the filtrate is directly heated, residual lithium carbonate in the solution is further separated out, the yield of lithium carbonate is improved, and meanwhile the phenomenon that in the presence of sulfate radicals, lithium ions, sodium ions and potassium ions generate the same ion effect, and the purity of lithium carbonate is affected is avoided.

The invention discloses a high-flux nanofiltration membrane suitable for iodide ion separation as well as a preparation method and application of the high-flux nanofiltration membrane. The nanofiltration membrane is prepared by taking an ultrafiltration membrane or an ultrafiltration membrane modified by a porous MOF material as a base membrane, taking an ethylene derivative as a membrane preparation monomer and adopting an ultraviolet radiation grafting method. The maximum removal rate of the nanofiltration membrane to 100 mg / LI <-> reaches 95% or above, even if chloride ions or sulfate ions exist in a solution, the removal rate of the membrane to iodide ions is good, the flux is far larger than that of a reverse osmosis membrane, the maximum removal rate can reach about 45 L / m < 2 >. H under 0.6 MPa, the flux is large, water is used as a solvent in the whole preparation process, and the nanofiltration membrane is environmentally friendly and free of pollution. The method is suitable for removing iodide ions in wastewater containing radioactive iodide ions and water areas with high iodide ion content, and has a good application prospect.

The invention belongs to the field of resource utilization of fly ash water washing liquid, and discloses a high-calcium mother liquid purification method of fly ash water washing liquid, which comprises the following steps: purifying heavy metal ions of the fly ash water washing liquid, and then evaporating and concentrating filtrate after heavy metal purification to separate sodium chloride and potassium chloride; finally, in the process of removing the potassium salt in the mother liquor, original sulfate ions in the solution are utilized, a small amount of ferric salt is added to achieve the purposes of purifying and removing potassium and purifying the calcium chloride concentrated solution, then evaporative crystallization is conducted, and an industrial calcium chloride product meeting the GB / T26520-2021 requirement is produced. The method is simple in process and low in cost, and green and efficient resource utilization of the fly ash washing liquid is achieved.

The invention relates to the technical field of scale inhibitors, in particular to a scale inhibitor, a preparation method and application. The scale inhibitor is prepared from the following raw materials in parts by weight: 30 to 35 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 6 to 10 parts of polyepoxysuccinic acid, 5 to 8 parts of polyethylene oxide fatty alcohol ether, 5 to 8 parts of sodium dodecyl benzene sulfonate, 4 to 6 parts of nano zinc oxide, 6 to 9 parts of metakaolin hybridization regulated filling agent, 5 to 7 parts of modified nano titanium dioxide agent, 4 to 6 parts of silane coupling agent KH560 and 30 to 35 parts of deionized water. According to the scale inhibitor, raw materials are blended, the scale inhibition effect of calcium carbonate and calcium sulfate ions of a product system is enhanced, the corrosion rate and the antibacterial effect of a product are optimized, the performance coordination balance of the product is excellent, and meanwhile the temperature-resistant stability effect of the product is remarkable.

The invention discloses subsea tunnel hole slag aggregate, a preparation method thereof and concrete containing the subsea tunnel hole slag aggregate, and belongs to the technical field of building materials. The preparation method of the modified subsea tunnel hole slag aggregate comprises the following steps: S1, soaking the subsea tunnel hole slag aggregate in a barium hydroxide solution, taking out the subsea tunnel hole slag aggregate, then soaking the subsea tunnel hole slag aggregate in a sodium silicate solution, and taking out the subsea tunnel hole slag aggregate and drying the subsea tunnel hole slag aggregate; s2, soaking in an ethyl cellulose solution, taking out, drying, soaking in an ion exchange chitosan gel solution, taking out, and drying, so as to obtain a finished product; the ion exchange chitosan gel solution is prepared from nitrate radical intercalation Mg-Al-LDHs (layered double hydroxides) and chitosan hydrogel. The subsea tunnel hole slag aggregate is sequentially subjected to modification treatment of weakening sulfate ion competition, blocking micro-cracks, wrapping controlled-release chloride ions and ion exchange curing chloride ions, so that the influence of double defects of high chloride ion content and multiple cracks of the subsea tunnel hole slag aggregate on the performance of the concrete is weakened; the service life of an engineering structure is prolonged, and high-value utilization of solid waste is achieved.

The invention discloses an electrolyte for an electrolytic copper foil, a method for preparing the copper foil and the copper foil, and the electrolyte for the electrolytic copper foil comprises copper ions, sulfate ions, chloride ions, collagen peptide, polyethylene glycol, hydroxyethyl cellulose, sodium dithiodipropane sulfonate and 0.25-0.55 mg / L of N, N-dimethyl dithioformamide sodium propane sulfonate. The copper foil generated by the electrolyte has relatively high elongation.