1541 results about "Sulfate radicals" patented technology

The invention relates to an aluminum oxide CMP polishing solution for rough polishing of silicon carbide wafers and a polishing method of the aluminum oxide CMP polishing solution, and the aluminum oxide CMP polishing solution comprises the following components in percentage by weight: 2-10wt% of nano aluminum oxide abrasive; 0.2 to 2 wt.% of a dispersant; 0.001 to 0.01 wt% of a pH regulator; the concentration of the oxidizing agent is 1-5wt.%. By adopting the compound oxidant, potassium permanganate is utilized to oxidize a reduction product manganese dioxide on the surface of the silicon carbide wafer to activate potassium persulfate, so that a large amount of sulfate free radicals are generated in the polishing solution, the oxidability of the sulfate free radicals is extremely high, the polishing solution can be promoted to generate chain oxidation reaction, and the surface of the silicon carbide wafer is further oxidized; and an oxide layer with low hardness is formed on the surface of the silicon carbide and is finally removed under the mechanical action of the aluminum oxide abrasive, so that the ultra-smooth and damage-free surface of the silicon carbide wafer is formed. The surface roughness of the obtained optimal silicon carbide wafer is 0.125 nm, and the material removal rate is 3.5 [mu] m / h. Compared with an existing aluminum oxide polishing solution, the polishing solution has the advantage that the surface quality and the polishing efficiency of the silicon carbide wafer are remarkably improved.

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 concrete admixture with sulfate corrosion resistance and rust resistance functions. The concrete admixture is prepared from the following raw materials in parts by weight: 50-65 parts of fly ash, 8-12 parts of barium carbonate, 8-12 parts of barium hydroxide, 8-12 parts of mineral powder, 5-8 parts of modified hydrotalcite or hydrotalcite, 1-3 parts of nano silicon dioxide and 1-3 parts of calcium nitrite. Nano silicon dioxide is adopted as a compact component, the porosity of the material is reduced, the compactness of concrete is improved, sulfate in the environment is inhibited from being transmitted into the concrete, meanwhile, hydrotalcite is modified by polymaleic acid serving as a scale inhibition component, and the scale inhibition effect is improved through the dual effects of high adsorbability and slow release of the scale inhibition component of hydrotalcite. The preparation method has the advantages that generation of ettringite and gypsum in a sulfate radical environment is inhibited, calcium nitrite is added as a corrosion-inhibiting component, a protective film is formed on the surface of a reinforcing steel bar, the corrosion phenomenon of the reinforcing steel bar in a concrete structure is inhibited, and finally, the concrete admixture with sulfate corrosion resistance and corrosion-inhibiting functions is formed through compounding.

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention relates to a preparation method of a high-hardness and high-sulfate-radical water quality scale inhibitor, and belongs to the technical field of water treatment.The preparation method comprises the steps that sodium carboxymethyl cellulose-sulfur quantum dots are prepared by using carboxymethyl cellulose as a stabilizer and then subjected to a copolymerization reaction with 2-acrylamido-2-methylpropanesulfonic acid and itaconic acid, and the high-hardness and high-sulfate-radical water quality scale inhibitor is obtained. The preparation method comprises the following steps: carrying out a reaction on sodium carboxymethyl cellulose and sulfur quantum dots to obtain modified sodium carboxymethyl cellulose-sulfur quantum dots, and carrying out a reaction on polysuccinimide, 4-amino phthalic acid and 2-aminoethanesulfonic acid to obtain a polyaspartic acid derivative; the modified sodium carboxymethyl cellulose-sulfur quantum dots and the polyaspartic acid derivative are mixed to serve as the scale inhibitor, the scale inhibition rate of the scale inhibitor is remarkably increased through the synergistic effect of the modified sodium carboxymethyl cellulose-sulfur quantum dots and the polyaspartic acid derivative, and meanwhile, due to the fact that a large number of new hydrogen bonds are generated between the modified sodium carboxymethyl cellulose-sulfur quantum dots and the polyaspartic acid derivative, the scale inhibition rate of the scale inhibitor is increased. The stability of a polymer structure is improved, so that the temperature resistance of the scale inhibitor is improved. The scale inhibitor is green and environment-friendly, and has excellent scale inhibition efficiency on high-hardness and high-sulfate-radical water.

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 the technical field of solid waste treatment, in particular to a method for removing antibiotics and resistance genes in aerobic composting of chicken manure. Comprising the following steps: adding a composting auxiliary material into chicken manure to enable the carbon-nitrogen ratio to be (25-30): 1, and adjusting the initial moisture content to 55-65% to obtain an initial composting material; adding persulfate and zero-valent iron into the initial compost material, and uniformly mixing; loading the mixed material into a container for composting; during the composting period, stirring is performed regularly, and the aerobic composting time is 30-40 days. The method has the advantages that the persulfate advanced oxidation technology and the aerobic composting technology are combined, the potassium persulfate and the zero-valent iron are added to serve as the aerobic composting additive, the zero-valent iron can continuously activate the potassium persulfate, persulfate free radicals and hydroxyl free radicals are generated, and removal of antibiotics and antibiotic resistance genes is promoted; high-concentration oxytetracycline, sulfamethoxazole and ciprofloxacin in the chicken manure are effectively removed; and the abundance of antibiotic resistance genes with high risk levels is obviously reduced.

The invention provides a succinic acid composition as well as polyester and a polyester composite material prepared from the succinic acid composition. The succinic acid composition comprises succinic acid, a compound containing sulfate radicals and a phosphorus compound, the mass content of sulfate radicals in the succinic acid composition is 240 to 500 ppm; the mass content of the phosphorus element in the succinic acid composition is 0.5 to 40 ppm. According to the present invention, by compounding the sulfate radical-containing compound and the phosphorus compound with the specific content, the polyester is prepared by using the succinic acid composition as the raw material, such that the production efficiency of the polyester can be ensured, the polyester with characteristics of low acid value and high viscosity can be obtained, and the corrosion of the polyester or the composition thereof on the metal equipment can be reduced during the polyester composite material extrusion process; the quality of the polyester composite material is ensured.

The invention relates to pseudo-boehmite and a preparation method thereof, and belongs to the technical field of porous alumina preparation. The method comprises the following steps: carrying out neutralization reaction on aluminum sulfate and an alkali source to obtain pseudo-boehmite colloidal particle slurry; aging the pseudo-boehmite colloidal particle slurry to obtain aged slurry with a set pH value; carrying out solid-liquid separation on the aged slurry to obtain a solid-phase substance; and washing the solid-phase substance for multiple times by using an alkaline solution containing ammonium ions so as to remove sulfate radicals carried by the solid-phase substance, thereby obtaining the pseudo-boehmite. Through the synergistic effect of the aging slurry with the set pH value and the alkaline solution containing ammonium ions, the content of sulfate radicals in the pseudo-boehmite is specifically reduced.

The invention discloses a concrete multi-ion transmission evaluation method considering saturation and porosity. The method comprises the following steps: constructing a concrete internal moisture transmission model; constructing a concrete internal calcium corrosion model under the influence of water saturation; constructing a transmission reaction model of sulfate ions in the concrete under the influence of water saturation and calcium corrosion; and constructing a concrete internal chloride ion transmission reaction model under the coupling action of water saturation, calcium corrosion and sulfate ions. According to the concrete multi-ion transmission evaluation method considering the saturation and the porosity provided by the invention, the influence of the moisture saturation, the porosity change and the ion chemical reaction on the ion transmission process in the long-term service concrete in the marine environment is comprehensively considered; and establishing a chloride ion transmission model in the concrete under the combined action of chlorine-sulfur coupling erosion and calcium corrosion, and revealing the durability degradation rule of the concrete structure in the marine environment.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a composite material as well as a preparation method and application thereof. According to the composite material, blended hydrogel of sodium alginate and polyvinyl alcohol is used as a matrix, zeolite molecular sieves, activated charcoal and zero-valent iron particles are embedded into the matrix to form microspheres, sulfate reducing bacteria are immobilized on the surfaces of the microspheres, the composite material is directly added into a mine water anaerobic reactor, the sulfate radical removal rate exceeds 92%, and the sulfate radical removal rate exceeds 92%. Heavy metals such as Cu, Pb and Cr in the mine water can be synchronously precipitated, and the treatment efficiency and stability of the anaerobic system are remarkably improved.

The invention discloses a nano-carbon supported ruthenium cluster nano-catalyst as well as a preparation method and application thereof. According to the present invention, the synthesis process of the catalyst is simple and easy to perform, the reaction process is controllable, the nanocarbon with characteristics of rich defects and large specific surface area is adopted as the carrier, the ruthenium cluster is loaded on the surface of the nanocarbon, and the nanometer catalyst with characteristics of high specific surface area and high atom utilization rate is synthesized. The catalyst can catalyze persulfate (PDS) to generate products with strong oxidation activity, namely sulfate free radicals (SO4.-), hydroxyl free radicals (. OH) and singlet oxygen (1O2), so that effective inactivation of bacteria is realized. In the invention, the reaction of activating the persulfate to disinfect by the catalyst is carried out at room temperature under neutral conditions, and in a mild reaction environment, the nanocarbon-loaded ruthenium cluster nanocatalyst shows good capability of catalyzing the persulfate to inactivate bacteria, and has huge potential in practical application of water disinfection.

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 a softening treatment method for high-calcium and high-sulfate radical sewage. By adding the seed crystal, calcium sulfate is crystallized to achieve the purpose of removing calcium ions, so that the generation of chemical sludge is avoided, and the cost of treating the chemical sludge is further reduced; according to the invention, the seed crystal is selected according to the saturation degree of the sewage, and the dosage of the seed crystal is determined, so that the selection of the optimal seed crystal type and dosage is achieved, the cost is saved, and the purpose of softening water is achieved.

The invention discloses a self-template synthesized linear biochar-based bimetallic material as well as a preparation method and application thereof, and belongs to the technical field of carbon materials. The method comprises the following steps: pretreating ganoderma lucidum residues, and pyrolyzing in a nitrogen atmosphere to prepare charcoal; and mixing the prepared biochar with cobalt nitrate and sodium molybdate to prepare CoMoO4 nanoparticles with in-situ growth of the biochar, and then washing and drying to obtain the BC-coated CoMoO4 linear biochar-based bimetallic material. Heterojunctions formed by binding sites of cobalt-molybdenum bimetal and biochar in the material form more defect sites, the synergistic effect of the metal and the micro-nano fibrous biochar is exerted, the degradation rate in the application of catalytic degradation of bisphenol A can reach 98.18% or above, a multiple reaction mechanism with sulfate free radicals is jointly shown, and the photocatalytic degradation of bisphenol A is realized. And the method has higher adaptability and effectiveness for complex pollutants.

The invention provides an efficient chloramphenicol degradation method based on Co-Cu-carbon composite nano-catalyst activated peroxymonosulfate, which comprises the following steps: regulating the Co / Cu molar ratio in a bimetal organic framework precursor, and performing pyrolysis to prepare the Co-Cu-carbon composite catalyst with an optimized pore structure, graphitization degree and metal dispersity; peroxymonosulfate is activated by utilizing the synergistic effect of Co / Co and Cu / Cu redox pairs to generate sulfate free radicals, hydroxyl free radicals, singlet oxygen and superoxide free radicals, and direct oxidative degradation of chloramphenicol is promoted by taking a catalyst as an electron transfer bridge; the method realizes rapid and efficient removal of chloramphenicol, high mineralization rate, excellent cycle stability and strong anti-interference capability, and solves the technical problems of low removal efficiency, high cost and easy secondary pollution in the prior art.

The invention relates to the field of sewage treatment, in particular to a sewage treatment system capable of recycling sulfur based on sulfur autotrophic denitrification, which comprises a pretreatment tank, an aerobic tank, a sulfur autotrophic denitrification reactor, an anaerobic tank and a secondary sedimentation tank which are sequentially connected, and the part of the secondary sedimentation tank containing supernatant mixed liquor is communicated with the aerobic tank; the anaerobic tank contains sulfate reducing bacteria, and sulfate radicals (SO4 < 2->) in the sewage discharged from the sulfur autotrophic denitrification reactor are reduced into S < 2-> by the anaerobic tank under the action of the sulfate reducing bacteria; water containing S < 2-> in the anaerobic tank enters a secondary sedimentation tank, and supernatant mixed liquor in the secondary sedimentation tank flows back to the aerobic tank; sulfur oxidizing bacteria are contained in the aerobic tank, and S < 2-> in the liquid flowing back from the secondary sedimentation tank is oxidized into S < 0 > and S2O3 < 2-> by the aerobic tank under the action of the sulfur oxidizing bacteria. According to the scheme, the problem that more SO4 < 2-> is generated in the current sulfur autotrophic denitrification process is solved, meanwhile, the consumption of electron donors is reduced, and the cost is reduced.

The invention discloses a carnallite recycling device and a carnallite recycling method. The carnallite recycling device comprises a crushing, screening and dissolving system, a hardness, silicon and fluorine removal system, a primary filter pressing system, an organic matter adsorption system, a secondary filter pressing system, a sand filtering system, a freezing crystallization system, a filtering system, a sodium chloride evaporative crystallization system and a sodium nitrate cold separation crystallization system which are connected in sequence. According to the carnallite recycling device and method, the problem that nitrate radicals are difficult to remove can be solved, and a high-purity sodium nitrate product is obtained, so that dissolved carnallite enters the freezing crystallization device, the sulfate radical concentration of frozen clear liquid can be controlled, then the carnallite enters the nanofiltration system, and the purity of sodium chloride can be guaranteed; and high-purity sodium nitrate can be separated from the finally enriched sodium nitrate through a cold separation method, so that multi-component carnallite can be recycled to the maximum extent.

The invention discloses a preparation method of straw composite nutrient soil, and the straw composite nutrient soil comprises the following components in parts by weight: 40-60 parts of pretreated straw, 15-30 parts of animal manure, 10-30 parts of an inorganic filler and 0.5-2 parts of a microbial agent. The pretreated straw is obtained by carrying out hydrothermal treatment on straw and acid liquor containing sulfate radicals. The straw and the animal manure are comprehensively utilized, the problem of environmental pollution caused by improper disposal of waste can be solved, waste can be turned into wealth, non-renewable resources such as turf are prevented from being added, and the use amount of the fertilizer is reduced. The straw composite nutrient soil is high in water and fertilizer retention performance, the compatibility of all the components is good, the survival rate of plants can be increased, and plant growth can be promoted.

The invention belongs to the technical field of inter-cooling water treatment, and relates to a system and method for cooperatively treating inter-cooling water through multi-stage bypasses. Comprising a gradient filtering unit, a modified adsorption unit and a composite adsorption unit which are sequentially connected, a bottom outlet of the gradient filtering unit is connected with a bottom inlet of the modified adsorption unit; a top outlet of the modified adsorption unit is connected with a top inlet of the composite adsorption unit; the gradient filtering unit sequentially comprises a manganese sand layer and a quartz sand layer from top to bottom; the modified adsorption unit is filled with a coal gangue modified straw biochar material; the composite adsorption unit is internally filled with a microcapsule-embedded calcium alginate-vinasse biochar composite material. According to the invention, three-stage cooperative treatment of iron suspended matter interception, sulfate radical adsorption and iron ion chelation is realized, and low-cost, green and sustainable indirect cooling water deep purification is realized by using the solid waste-based functional material.

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 method for recycling iron phosphate from chemical nickel-plating waste liquid, which belongs to the technical field of industrial wastewater treatment and recycling, and comprises the following steps: S1, chemical nickel-plating waste liquid pretreatment: putting the chemical nickel-plating waste liquid into an electrolytic bath for electrolytic treatment, adding calcium salt into the electrolyzed waste liquid to remove sulfate ions, adding a sodium hydroxide solution to further remove nickel ions to obtain nickel-removed waste liquid; s2, Fenton oxidation: adding hydrogen peroxide and a surface-modified coated nano zero-valent iron Fenton catalyst into the nickel-removed waste liquid, and carrying out Fenton oxidation to obtain iron phosphate precipitate; s3, separating the iron phosphate precipitate from the wastewater; s4, electro-Fenton oxidation: finally, carrying out electro-Fenton oxidation on the cleaning wastewater and the wastewater subjected to filter pressing to obtain iron phosphate precipitate. The efficiency and purity of recovering iron phosphate from the chemical nickel-plating waste liquid are improved, and the problems of low iron phosphate recovery rate and insufficient catalyst stability in the prior art are solved.

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 provides a method and system for recovering phosphate radicals, fluorine ions and sulfate radicals from phosphogypsum washing water step by step, and belongs to the technical field of industrial wastewater resourceful treatment. The method comprises the following steps: (1) adjusting the pH value of the wastewater to 3.0 + / -0.5, adding ferric sulfate according to the molar ratio of Fe to PO4 < 3-> of (1.0-1.5): 1, and selectively precipitating phosphate radicals to generate iron phosphate with the purity of more than or equal to 97%; (2) adjusting the pH value of the first filtrate to 4.7 + / -0.5, adding calcium fluoride seed crystals with the particle size of 50-200mm and CaCl2 (the molar ratio of Ca to F <-> is 0.5: 1-0.6: 1), and carrying out induced crystallization to recover calcium fluoride with the purity of more than or equal to 96%; and (3) adding Ca (OH) 2 (Ca: SO4 < 2-> molar ratio of 1.0: 1-1.2: 1) into the second filtrate, and directionally precipitating sulfate radicals to generate calcium sulfate dihydrate with the purity of more than or equal to 98%. According to the method, the pH and the precipitation sequence are controlled step by step, so that the problem of polyanion competition is solved, the recovery rates of phosphate radical, fluorine ion and sulfate radical respectively reach 98.8%, 96.3% and 97.5%, the content of PO4 < 3-> in purified water is less than or equal to 10 mg.L <-1 >, the content of F <-1 > is less than or equal to 5 mg.L <-1 >, and the content of SO4 < 2-> in purified water is less than or equal to 100 mg.L <-1 >, and the purified water can be directly recycled.

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.

The invention belongs to the technical field of industrial wastewater recycling and lithium ion battery positive electrode material preparation, and relates to a method for recycling phosphorus and nickel resources in chemical nickel plating wastewater and synthesizing high-purity iron phosphate through a paired electrolysis method. The method comprises the steps that a double-chamber diaphragm electrolytic cell is adopted, a diaphragm is an anion exchange membrane, an anode is iron, a cathode is at least one of a metal electrode, an alloy electrode and a graphite electrode, an anolyte is a solution containing sulfate radicals, a catholyte is chemical nickel-plating wastewater, a paired electrolysis method is adopted, phosphorus resources are recycled from the anode, and high-purity iron phosphate is synthesized. And nickel resources are recovered through cathode electrodeposition of nickel. According to the method, phosphorus and nickel are recycled through an electro-deposition method, and the current efficiency is greatly improved; the method is high in recovery rate, low in cost and simple in process, industrial large-scale production can be realized, and the recovered iron phosphate has very high purity and can be used as a precursor raw material for synthesizing lithium iron phosphate serving as a positive electrode material of a lithium ion battery.

The invention relates to the technical field of sewage treatment, in particular to a composition for degrading triazole bactericides and application of the composition. The invention provides a composition for degrading triazole bactericides. The composition comprises persulfate and a catalyst, the catalyst takes foamed nickel as a carrier and is loaded with a cobalt-nickel layered bimetallic oxide. The cobalt-nickel layered bimetallic oxide is rich in oxygen vacancies, and has a larger specific surface area, higher stability and a higher oxidation reduction rate. In the process of activating sulfate by the cobalt-nickel layered bimetallic oxide, a large amount of free radical sulfate free radical # imgabs0 # superoxide free radical # imgabs1 # and non-free radical singlet oxygen (1O2) are generated, and triazole bactericides are synergistically degraded based on a free radical path and a non-free radical path.

The invention discloses a lithium adsorbent and a preparation method and application thereof. According to the preparation method of the lithium adsorbent provided by the invention, Al < 3 + > and Mg < 2 + > are subjected to complexing and coprecipitation in the presence of a complexing agent to obtain the magnesium-doped aluminum adsorbent. According to the preparation method of the lithium adsorbent provided by the invention, Al < 3 + > and Mg < 2 + > are co-precipitated under the action of the complexing agent by adding the complexing agent, the magnesium element is uniformly distributed in the adsorbent, the prepared magnesium-doped aluminum lithium adsorbent can improve the tolerance of the magnesium-doped aluminum lithium adsorbent to high-sulfate salt lake brine, chemical components in the magnesium-doped aluminum lithium adsorbent product are uniformly distributed, and the stability of the magnesium-doped aluminum lithium adsorbent product is improved. And the cost is lower.