240 results about "Sodium persulfate" patented technology

The invention discloses a method for recovering lithium phosphate from lithium iron phosphate black powder. The method comprises the following steps: mixing black powder recovered from waste lithium iron phosphate batteries with sodium persulfate, and calcining; adding water into the obtained calcined product, dissolving, filtering to obtain water extract A and leaching residues, washing the leaching residues with water, and calcining at high temperature to obtain battery-grade iron phosphate; adding a sodium hydroxide solution into the water extract A, and reacting to obtain a water extract B; adding a trisodium phosphate solution into the water immersion liquid B, fully reacting, performing suction filtration to obtain lithium phosphate and filtrate, and cleaning and drying the lithium phosphate to obtain battery-grade lithium phosphate; and freezing and denitrifying the filtrate to obtain a denitrified solution, and adding the denitrified solution into the sodium hydroxide solution for recycling. The method does not generate wastes, recycles the filtrate in the whole process, theoretically realizes zero loss of the lithium element, prevents the iron element from entering the solution, simplifies the preparation steps of the lithium phosphate, and has the advantages of cost reduction and environmental protection.

A low-carbon near zero emission process of industrial waste water, comprising: S1: entering industrial waste water into a pre-oxidation system to improve biodegradability of organics; S2: after treatment in the pre-oxidation unit, entering the waste water into an anaerobic biological treatment system, sodium chloride and sulfate is deeply removed and carbon sources in the waste water can be used to remove the sulfate and nitrate; S3: entering water output from the anaerobic biological treatment system into a membrane concentration system and membrane concentrated solution enters a nano-filtration salt fractionation system for salt fractionation; and S4: refluxing nano-filtration concentrate solution generated by the nano-filtration salt fractionation system to the anaerobic biologic treatment system for biological desulfurization, or synthesizing the nano-filtration concentrate solution to be sodium persulfate by electro chemical methods, and refluxing proportionately to a waste water pre-oxidation system for use in-situ.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a pretreatment method for improving the leaching rate and the carbon adsorption rate of high-sulfur-arsenic gold ore. Comprising the following steps that the high-sulfur-arsenic gold ore is ground and then prepared into ore pulp; a green oxygen activating agent and hydrogen peroxide are sequentially added into the ore pulp, oxidation pretreatment is conducted on the high-sulfur-arsenic gold ore, ore pulp activating liquid is formed, and the green oxygen activating agent is a mixture of calcium oxide, sodium persulfate and soluble bivalent iron salt; and adding a gold leaching agent into the ore pulp activation solution, adjusting the pH value of the ore pulp to 9-12, carrying out stirring gold leaching treatment, filtering to obtain a leaching solution, and then adding activated carbon to adsorb and extract gold. According to the method, a stronger oxidation environment is provided, meanwhile, the residual concentration of arsenate radicals in the solution is effectively reduced, the leaching rate of gold and the adsorption rate of activated carbon are greatly increased, excellent oxidation performance and environment friendliness are shown, and a more sustainable high-sulfur-arsenic gold ore pretreatment process is provided.

The invention relates to the technical field of lithium adsorbents, in particular to a preparation and application method of a porous microsphere adsorbent for extracting lithium, and the preparation method comprises the following steps: preparing a water phase solution containing methacrylic acid, water and an emulsifier; the preparation method comprises the following steps: preparing an oil phase solution containing a fluorinated methacrylate monomer containing beta-diketone, cyclohexyl methacrylate, methoxyethyl methacrylate, N, N-bis (acryloyl) cystamine, ethylene glycol dimethacrylate, azodiisobutyronitrile and a solvent; dropwise adding the oil-phase solution into the water-phase solution for gradient emulsification, adding sodium persulfate to initiate polymerization, and performing centrifugal drying to obtain porous microspheres; and immersing the porous microspheres into a NaOH solution for hydrolysis activation, and drying to obtain the porous microsphere adsorbent for selective adsorption of lithium ions. Wherein the beta-diketone can enhance the targeted adsorption effect of the adsorbent on lithium ions and has relatively high selectivity and adsorption capacity, and the strong electron-withdrawing property of CF3 further polarizes carbonyl and enhances the coordination ability of the lithium ions.

The invention discloses a method for deeply removing arsenic from a nickel sulfate solution, which comprises the following steps: adjusting the pH value by using nickel hydroxide to form colloid to preliminarily remove arsenic, oxidizing by using sodium sulfate, and adding polyferric sulfate to form ferric hydroxide colloid to deeply adsorb and remove arsenic, and is simple in process, convenient to implement in the production process, capable of greatly reducing the cost and reducing the environmental pollution, and suitable for industrial production. The method comprises the following steps: adjusting the pH value of a low-pH leaching solution / anolyte / crude nickel sulfate dissolving solution to 4.0 or more by using nickel hydroxide, carrying out filter pressing to remove slag, adding arsenic ions in a sodium persulfate oxidation solution, reacting for 30 minutes, adding polyferric sulfate, reacting for 30 minutes, and carrying out filter pressing to obtain a nickel sulfate solution which is almost free of arsenic, and the method is efficient, safe and environment-friendly.

The invention belongs to the field of coalification wastewater membrane concentrated solution treatment, and discloses a coalification wastewater membrane concentrated solution treatment agent and a preparation method thereof. The coalification wastewater membrane concentrated solution treating agent is prepared from the following raw materials in parts by weight: 20 to 40 parts of sodium persulfate, 1 to 5 parts of polyacrylamide, 30 to 50 parts of modified diatomite and 10 to 30 parts of modified starch. Wherein the modified diatomite is obtained by carrying out ring-opening reaction on silanized modified diatomite and beta-cyclodextrin, and the modified starch is obtained by carrying out oxidation ring-opening reaction on starch after being pretreated by Na2S. Through dual modification and synergistic effect of the modified diatomite and the modified starch, efficient removal of organic matters and heavy metal ions in coalification wastewater is realized. Wherein hydroxyl and siloxane groups on the surface of the modified diatomite and beta-cyclodextrin have an inclusion effect, so that multiple types of organic pollutants can be adsorbed at the same time, carboxyl on the surface of the modified starch is used for complexing heavy metal ions, and the treatment efficiency is improved.

The utility model relates to the technical field of soil remediation, and discloses a circulating chemical injection system for contaminated soil, which comprises a sodium persulfate dissolving and activating tank, a solution tank stirrer is arranged at the top of the sodium persulfate dissolving and activating tank, and a small-flow metering pump is arranged at the output end of the sodium persulfate dissolving and activating tank. One side of the small-flow metering pump is connected to the input end of a sodium persulfate solution storage tank through a chemical conveying pipe, a solution tank stirrer is arranged at the top of the sodium persulfate solution storage tank, and a large-flow metering pump is arranged at the output end of the sodium persulfate solution storage tank; the output end of the pressurization system is evenly connected with adjusting valves through chemical conveying pipes. According to the utility model, by introducing an innovative small-tooth-mouth steel sheet pile waterproof curtain technology, the environmental safety and efficiency of the repair work are remarkably improved, the small-tooth-mouth steel sheet piles are unique in design, so that the installation process is rapid and efficient, and the exchange between peripheral underground water and underground water in a repair area can be cut off to prevent secondary diffusion of pollution.

The invention discloses a method for preparing battery-grade lithium phosphate and iron phosphate by recycling waste lithium iron phosphate batteries, and belongs to the technical field of lithium ion battery recycling. The method comprises the following steps: mixing and calcining black powder recovered from the waste lithium iron phosphate battery and sodium persulfate; adding water for dissolving, filtering to obtain a water leaching solution A and leaching residues, washing the leaching residues with water, and calcining at high temperature to obtain battery-grade iron phosphate; adding a sodium hydroxide solution into the water extract A, and reacting to obtain a water extract B; adding a trisodium phosphate solution into the water immersion liquid B, performing suction filtration after reaction to obtain lithium phosphate and filtrate, and cleaning and drying the lithium phosphate to obtain battery-grade lithium phosphate; and freezing and denitrifying the filtrate to obtain a denitrified solution, and adding the denitrified solution into the sodium hydroxide solution for recycling. The filtrate is recycled in the whole production process, zero loss of the lithium element is theoretically realized, the iron element is prevented from entering the solution, the preparation steps of the lithium phosphate are simplified, and the method has the advantages of economy and environmental protection.

The invention relates to the technical field of textile chemicals, in particular to an electrolyte-resistant printing thickening agent for improving the coloring effect and a preparation method thereof.The electrolyte-resistant printing thickening agent is prepared from, by weight, 10-20 parts of methacrylic acid, 15-30 parts of triethanolamine, 0.1-0.5 part of N, N '-methylene bisacrylamide, 4-8 parts of functional monomers and 2-5 parts of organic modified nano bentonite. 3-6 parts of an emulsifier, 0.1-0.6 part of sodium hydrogen sulfite, 0.1-0.6 part of sodium persulfate, 8-15 parts of an oil-phase solvent, 2-5 parts of a reverse-phase emulsifier and 30-50 parts of water; the functional monomer is prepared from p-styrene propanesulfonic acid, 2-acrylamide-2-methyl propanesulfonic acid and triphenylethyl phenol polyoxyethylene ether methacrylate according to the weight ratio of (3 to 5) to (1 to 2) to 1. According to the electrolyte-resistant printing thickening agent capable of improving the coloring effect, through matching and combination of the raw materials, the electrolyte resistance of the thickening agent can be improved, and the coloring effect in textile printing is improved.

The invention relates to the technical field of agriculture, in particular to a soil conditioner for degrading soil fertilizer and pesticide residues and a preparation method thereof, and aims to solve the problems that although an existing soil conditioner can reduce the fertilizer and pesticide residues to a certain extent, secondary pollution is often caused, the cost is high, and the effect of degrading the soil fertilizer and pesticide residues is limited. According to the soil conditioner, humic acid, plant ash, corn straw, kieselguhr, polyglutamic acid and potassium fulvic acid are reasonably compounded, the physical and chemical properties of soil can be improved, the fertility of the soil can be improved, and after the complex microbial inoculants, the loaded pore-increasing charcoal and the coated sodium persulfate are added into the soil conditioner, under the synergistic effect of the three, the soil conditioner can improve the soil fertility. The efficient and long-acting degradation of fertilizer and pesticide residues in the soil is realized, the soil quality, the soil structure and the fertility can be improved, the healthy growth of crops can be promoted, the yield and the quality of the crops can be improved, the sustainable development of agriculture is guaranteed, and finally the comprehensive improvement of the soil is realized.

The invention belongs to the technical field of uranium mining, and particularly relates to a sodium persulfate acid oxidation green in-situ leaching uranium mining method. The method comprises the following steps: (1) exploring and pretreating an ore bed; (2) arranging an injection well and an extraction well; (3) preparing an acidic leaching solution; (4) injecting a leaching solution; (5) in-situ leaching circulation and monitoring; and (6) post-harvest treatment. The novel green acid in-situ leaching uranium mining method is developed, the oxidation rate of tetravalent uranium can be greatly increased, the uranium leaching rate is increased, and compared with an existing acid leaching method, the uranium leaching rate is remarkably increased, and environmental protection is achieved.

The invention provides a sodium-rich ferric sodium pyrophosphate positive electrode precursor and a preparation method and application thereof.The preparation method comprises the following steps that a ferrite solution, a phosphoric acid source solution, a pyrophosphoric acid source solution, an alkaline solution and a sodium persulfate solution are injected into a base solution in a parallel flow mode for a co-precipitation reaction, the sodium-rich ferric sodium pyrophosphate positive electrode precursor is obtained; wherein the base solution is pure water. The method disclosed by the invention is simple to operate, the sodium-rich ferric sodium pyrophosphate positive electrode precursor with high sodium content, uniform element distribution and uniform phase can be prepared, the sodium-rich ferric sodium pyrophosphate positive electrode precursor is low in gas production rate in the subsequent sintering process, and the sodium-rich ferric sodium pyrophosphate positive electrode material with high compaction density can be prepared.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a zero-discharge treatment system and method for polycrystalline silicon wastewater. Comprising a pretreatment system, a membrane treatment system and an evaporative crystallization system which are sequentially connected along a water flow direction, the pretreatment system comprises a sodium sulfate softening and precipitating unit, a dual-alkali softening and precipitating unit, an enhanced hardness and silicon removal unit, a ceramic membrane filtering unit, a decarburization unit and an ion exchange unit; the membrane treatment system comprises a COD (Chemical Oxygen Demand) purification membrane unit and a two-stage nanofiltration unit; the evaporative crystallization system comprises an evaporation unit, a circulating evaporative crystallization unit, a separation unit and a mother liquor drying unit. According to the method, high-value industrial byproduct gypsum is generated through sodium sulfate softening precipitation in the pretreatment stage, meanwhile, the cost of a softening agent is reduced, sodium sulfate generated by a membrane treatment system is recycled, the investment cost of an evaporative crystallization system is reduced, and resource utilization of wastewater treatment byproducts and sustainable development of the environment are achieved.

The utility model discloses a pesticide wastewater advanced treatment device which comprises a first-stage oxidation tower, a second-stage main reaction tower and a third-stage delay reaction tower which are sequentially arranged, a water outlet of the first-stage oxidation tower is communicated with a water inlet of the second-stage main reaction tower, and a water outlet of the second-stage main reaction tower is communicated with a water inlet of the third-stage delay reaction tower; the primary oxidation tower comprises a first tower body, a water inlet pipe, a first hydrogen peroxide adding pipe and an ozone jet device, the water inlet pipe is communicated with the first tower body, the first hydrogen peroxide adding pipe is communicated with the water inlet pipe, and the ozone jet device is mounted on the first tower body to introduce ozone into the first tower body; the secondary main reaction tower comprises a second tower body, a sodium persulfate dosing pipe and an ozone aeration disc; the sodium persulfate dosing pipe is communicated with a water inlet of the second tower body; the ozone aeration disc is arranged at the bottom in the second tower body; the third-stage delay reaction tower comprises a third tower body and a second hydrogen peroxide adding pipe, and the second hydrogen peroxide adding pipe is communicated with a water inlet of the third tower body.

Embodiments herein relate to recycling of used lithium battery materials. In some aspects, a method may include suspending a lithium source in a solvent containing an oxidizing agent to extract lithium, forming an extracted lithium solution, separating the extracted lithium solution from residual solids of the lithium source, purifying the extracted lithium solution by precipitating and filtering impurities, and precipitating lithium in the purified lithium solution to produce lithium carbonate (Li2CO3). In some embodiments, the method may also include pre-treating the lithium source to improve the kinetics of the lithium extraction. In some embodiments, the pretreatment may include a cutting or comminution step to reduce the size of the lithium source. In some embodiments, the lithium source may include lithium ion battery waste. In some embodiments, the oxidizing agent may include sodium persulfate (Na2S2O8), potassium persulfate ((NH4) 2S2O8), ammonium persulfate (NH4) 2S2O8, hydrogen peroxide (H2O2), ozone (O3), and / or nitrous oxide (N2O).

The invention relates to the technical field of switch valves, in particular to a switch valve for sodium persulfate production, which comprises a gas source, a valve body assembly and a sealing assembly, the valve body assembly comprises a valve body, the valve body comprises a hollow cylinder and a connecting rod, and the connecting rod is vertically connected to the outer wall of the hollow cylinder; a transmission channel and an airflow channel are arranged in the connecting rod and penetrate through the outer wall of the hollow cylinder; the sealing assembly comprises a second air source valve and a sealing ring, and the sealing ring is made of an elastic material; a plurality of cavities are formed in the sealing ring and are communicated with the airflow channel; the second air source valve is communicated with the air source, the outside and the airflow channel; by additionally arranging the additional airflow channel, intermittent inflation and deflation can be carried out by utilizing an air source when medium flow is generated in a discharging state, and sodium persulfate crystallized on the surface of the sealing ring is repeatedly extruded and stretched by combining with an elastic material, so that the sodium persulfate is crystallized and broken and then is taken away by a medium flow; and an emergency leaking stoppage effect can also be achieved.

The invention provides an organic solderability preservative and a preparation method for forming a protective film on the surface of copper, the organic solderability preservative comprises the following components in parts by weight: 3.0-4.5 parts of 2-(3, 4-dichlorobenzyl) benzimidazole, 52.5 parts of acetic acid, 0.75 part of n-heptanoic acid, 0.25-0.5 part of zinc acetate, 0.25-0.5 part of copper sulfate, 0.2 part of citric acid modified nano cerium oxide, and the balance of deionized water and a pH regulator; the preparation method for forming the protective film on the copper surface comprises the following steps: oil removal treatment: treating a circuit board in a sodium hydroxide solution; pickling treatment: treating in a sulfuric acid solution; micro-etching treatment: treating in a solution of sodium persulfate and sulfuric acid; pickling treatment: treating in a sulfuric acid solution; film forming treatment: dipping in an organic solderability preservative at 45 DEG C;

A process for the production of iron phosphate, comprising the following steps: (1) Mixing an iron phosphide waste, an acidic liquid, an oxidizing agent and an adsorbent with stirring, heating to leaching and subjecting the resulting mixture to solid-liquid separation to obtain a first filtrate and a first filter residue; (2) Adding an alkaline liquid to the first filtrate to adjust the pH of the first filtrate, maintaining a temperature of the resulting mixture, and subjecting the resulting mixture to solid-liquid separation to obtain a second filter residue and a second filtrate; and subjecting the second filter residue to heat treatment to obtain iron oxide; (3) Subjecting the iron oxide to high-energy ball milling and adding a surfactant for activation to obtain a slurry; (4) Adding an extraction agent and an acidic liquid to the second filtrate obtained in step (2), carrying out an extraction and separation on a resulting mixture and subjecting a resulting organic phase to back-extraction to obtain phosphoric acid; and (5) Mixing the slurry obtained in step (3) with the phosphoric acid, heating to enable a reaction, subjecting the resulting mixture to solid-liquid separation to obtain a solid, and washing and sintering the solid to obtain the iron phosphate; where in step (1) the iron phosphide waste comprises a mixture of FeP and Fe2P; in step (1) the acidic liquid contains at least two from the following group: nitric acid, sulfuric acid and hydrochloric acid; In step (1) the oxidizing agent is at least one selected from the group consisting of hydrogen peroxide, oxygen, nitric acid and sodium persulfate; wherein in step (2) the alkaline liquid is at least one selected from the group consisting of a NaOH solution, a KOH solution, ammonia water, a urea solution, NH4Cl, NH4HCO3, Na2CO3 and NaHCO3; In step (2) the pH of the first filtrate is adjusted to 2.5 to 5; and In step (5) the molar ratio of Fe in the slurry to P in the phosphoric acid is 1:1–2; heating to enable a reaction is carried out at a temperature of 50 °C to 80 °C for 20 to 60 min; and the iron phosphate has a D 50 from 2 µm to 6 µm, a tapped density of 0.80 g / cm³ 3 up to 1.30 g / cm³ 3 , and a specific surface area of ​​4 m² 2 / g up to 8 m 2 / g indicates.

The invention discloses a treatment agent for kitchen waste deodorization and a deodorization process, and belongs to the technical field of waste treatment. The treatment agent for kitchen waste deodorization comprises ZIF-8 (at) TiO2 / Fe2O3 and a coated sodium persulfate material, titanium dioxide, ferric oxide and sodium persulfate are taken as active components, diatomite in the ZIF-8 and the coated sodium persulfate material is taken as an adsorption material, odor substances in kitchen waste treatment odor are adsorbed and enriched, and the odor substances in the kitchen waste treatment odor are adsorbed and enriched. Under the photocatalysis effect, the active components are matched to generate free radicals, so that the photocatalytic oxidation degradation of odor substances is realized. The treatment agent for kitchen waste deodorization is combined with charcoal loaded with tea polyphenol to design a deodorization process, NH3, H2S and VOCs are efficiently degraded and removed through coupling of photocatalytic oxidation and chemical adsorption, double guarantee of degradation and adsorption is achieved, multi-stage treatment is achieved, and the treatment agent is suitable for complex component treatment of kitchen waste odor.

The present application relates to the technical field of combustible substance detection in ammonium nitrate, and provides an automatic device for detecting combustible substance in ammonium nitrate, which comprises a reagent storage unit for storing ammonium nitrate sample, sodium persulfate reagent and phosphoric acid reagent; a CO2 infrared analyzer is connected with the reagent storage unit, the CO2 infrared analyzer can receive the reagent supplied by the reagent storage unit and determine the content of CO2 after the combustible substance in the ammonium nitrate sample is oxidized by the sodium sulfate reagent to form CO2; a controller controls the reagent storage unit to supply the reagent to the CO2 infrared analyzer, and receives and analyzes the content information of CO2 determined by the CO2 infrared analyzer to obtain the content of combustible substance in ammonium nitrate. The automatic device for detecting combustible substance in ammonium nitrate provided by the present application realizes efficient detection of combustible substance by using wet oxidation-infrared quantitative technology.

Disclosed in the present invention are an acrylate emulsion for a polymer cement waterproof coating, a raw material composition thereof, a preparation method therefor, and a use thereof. The raw material composition comprises the following components in parts by weight: 3-4.5 parts of sodium dodecyl diphenyl ether disulfonate, 1.5-2.5 parts of acrylamide, 2-4 parts of fatty alcohol polyoxyethylene ether, 2-4 parts of polyethylene glycol dimethacrylate, 1-2 parts of acrylic acid, 0.5-1 part of titanium triisostearoylisopropoxide, 40-60 parts of acrylate, 0.5-1 part of sodium persulfate, 50-60 parts of deionized water, and 0.1-0.3 parts of a 10% sodium hydroxide solution. The acrylate emulsion prepared by the present invention has excellent performance and good dispersibility, and a polymer cement waterproof coating prepared by using the emulsion of the present invention has lower viscosity and better workability.

The invention discloses a dechlorination method of a wet-process phosphoric acid process, and belongs to the technical field of dechlorination of wet-process phosphoric acid. The method comprises the following steps: adding ground phosphorite into a reaction tank A, carrying out decomposition reaction on the phosphorite and high-temperature slurry to obtain slurry a, pumping the slurry a into a reaction tank B, adding concentrated sulfuric acid and a sodium persulfate solution, activating sodium persulfate in the inherent high temperature, strong acid and Fe2 environment, carrying out oxidation dechlorination reaction, and carrying out solid-liquid separation to obtain low-chlorine phosphoric acid and phosphogypsum; finally, the reaction tank B is connected with a tail gas washing system, water is used for circulating washing, then alkali liquor is used for countercurrent washing, and the pollution discharge standard is met. The oxidation dechlorination process is integrated in the wet-process phosphoric acid production process for the first time, chloride ions are efficiently oxidized into chlorine to be removed by utilizing the strong oxidizing property of sodium persulfate, the dechlorination rate can reach 95% or above, the chlorine content in phosphoric acid is remarkably reduced, equipment corrosion is relieved, the product quality is improved, and the method is simple in process, low in energy consumption, low in cost, green, environmentally friendly and suitable for industrial production. The method is suitable for industrial application.

The invention provides an electrochemical degradation method for benzene series volatile organic waste gas. The method comprises the following steps: introducing benzene series VOCs into an electrolyte, respectively connecting a cathode and an anode with a negative electrode and a positive electrode of a power supply, and electrolyzing the electrolyte to degrade the benzene series VOCs, the electrolyte is a sodium persulfate solution; according to the electrochemical degradation method for the volatile organic waste gas of the benzene series, the volatile organic waste gas of the benzene series is oxidized and degraded by adopting the electro-activated persulfate; compared with other persulfate (PDS) activation methods, the electrochemical activation technology (E / PDS) has the unique advantage that the degradation performance of benzene series VOCs is superior to that of an anodic oxidation method due to the generation of reactive oxides (ROS) (mainly. SO4 <-> and. OH). According to the benzene series VOCs degradation method disclosed by the invention, by controlling process parameters, the benzene series VOCs have relatively high conversion rate and mineralization rate.

The present application relates to the technical field of water treatment, and particularly relates to a coal chemical industry reverse osmosis concentrated water treatment method, wherein the coal chemical industry reverse osmosis concentrated water is adjusted in pH value, and then sequentially filtered by a positively charged HCRNF membrane and a negatively charged NF245 membrane to realize acid nanofiltration desalting; the concentrated water obtained by the positively charged membrane and the negatively charged membrane is treated by a sodium persulfate system activated by ultraviolet light, and then returned to a front-end RO concentrated water treatment unit; the water produced by the positively charged membrane is desalted by RO1 reverse osmosis membrane deep treatment, and the produced water meets the discharge / recycle standard; and the concentrated water of the reverse osmosis membrane enters an evaporation crystallization unit. The present application takes into account efficient removal of COD and effective separation of salt, reduces energy consumption, significantly inhibits the risk of irreversible membrane surface pollution, and provides core technical support for improving the treatment efficiency and system stability of the nanofiltration unit.

The invention relates to the technical field of sewage treatment, in particular to a high-fluorine desulfurization wastewater resourceful treatment method and device.The treatment method comprises the steps that S1, preliminary fluorine removal is conducted, specifically, metal salt and coagulant aids are added into wastewater under the acidic condition for a reaction; s2, performing ultrafiltration treatment; s3, deep fluorine removal: carrying out deep adsorption on ultrafiltration effluent by using Fe / Al modified resin; s4, primary electrolysis; s5, acidification reaction: adding sulfuric acid into the system, adjusting the pH to be acidic, and controlling the temperature for reaction; s6, primary low-temperature salt extraction: performing vacuum negative-pressure evaporative crystallization, and performing centrifugal drying to obtain a sodium persulfate solid; s7, secondary electrolysis: carrying out secondary electrolysis on the centrifugal mother liquor in the step S6; and S8, secondary low-temperature salt extraction: performing vacuum negative-pressure evaporative crystallization, and performing centrifugal drying to obtain a sodium persulfate solid. According to the treatment method, the produced water can be recycled, high-value resource utilization of salt in the wastewater is realized, and the treatment cost is reduced.

The invention provides a reagent for treating steel industry membrane concentrated water and a water treatment method, and relates to the technical field of waste liquid treatment.The steel industry membrane concentrated water treatment reagent is prepared from, by mass, 0.8-4.5 parts of a first oxidizing agent, 0.5-3.5 parts of a second oxidizing agent and the balance auxiliary reagents, the first oxidizing agent is composed of 0.3-2.5 parts of sodium peroxide and 0.5-3.5 parts of ozone, the second oxidizing agent is 0.5-3.5 parts of sodium persulfate, and the dosage of the reagent is 3-15 g / L. Ozone is introduced by adopting an ultra-fine bubble technology; when the reagent is used for a water treatment process, ozone and sodium peroxide have a synergistic effect, so that the effect of reducing the COD value in membrane concentrated water is enhanced; an ozone ultra-fine bubble technology is adopted, so that addition of an additional catalyst can be avoided; according to the technology, the COD value of the membrane concentrated water can be effectively reduced, other suspended solids and heavy metal ions are treated, and reuse water meeting the standard is obtained.

The invention relates to the technical field of environmental protection, in particular to application of an ethylene waste alkali solution to preparation of sodium carbonate, the ethylene waste alkali solution is used as a raw material, and an ethylene waste alkali solution treatment device is used for preparing a sodium carbonate product with the purity of 99% or above. The method comprises the following steps: providing a sodium sulfate solution through a sodium sulfate supply device by taking ethylene waste alkali liquor as a raw material; according to the method, sodium ion exchange resin is used as a raw material, an ammonium bicarbonate solution and a sodium chloride solution are supplemented into the sodium ion exchange resin at the same time, the ethylene waste alkali liquid is used as the raw material, and NH4HCO3, NaCl and Na2SO4 are input at the same time when Na < + > ions in the sodium ion exchange resin are insufficient, so that exchange of the Na < + > ions and the NH4 < + > ions is accelerated, and sodium carbonate with the purity being 99% or above is prepared. The problems that in the prior art, sodium carbonate prepared by taking ethylene waste alkali liquor as a raw material contains sodium sulfate and the purity of sodium carbonate is not high are solved.

The invention provides a sulphoaluminate cement composite thickening time control agent and application thereof, and relates to the technical field of building materials. The sulphoaluminate cement composite thickening time control agent is prepared by mixing the following raw materials in parts by weight: 11-48 parts of sodium sulfate or calcium nitrate and 1-8 parts of citric acid. According to the invention, through the synergistic effect of the sodium sulfate-citric acid system and the calcium nitrate-citric acid system on the sulphoaluminate cement, the fluidity of the sulphoaluminate cement is improved, the setting time is prolonged, and the sulphoaluminate cement has high early strength.

A process for producing a nitrogen-doped peony-shaped molybdenum oxide, comprising the following steps: (1) adding a regulator to a molybdenum-containing solution for reacting, concentrating and thermally treating to obtain a peony-shaped molybdenum oxide; and (2) dissolving the peony-shaped molybdenum oxide in a conditioning agent and adding an amine source for standing, centrifuging, washing, and heat-treating, thereby obtaining the nitrogen-doped peony-shaped molybdenum oxide; wherein the regulator is at least one of the following: nitric acid, ammonium nitrate, sodium persulfate, ammonium persulfate, concentrated sulfuric acid, H2O2, ozone, sodium hypochlorite, wherein in step (2), the conditioning agent is at least one of the following: sodium acetate, ammonium acetate, sodium formate, diaminoethane, sodium oxalate, ammonium benzoate, sodium phenylacetate, sodium propionate, sodium tartrate, sodium citrate, ammonium citrate; and wherein in step (2) the amine source is at least one of the following: aniline, dimethylamine, trimethylamine, benzylamine, phenethylamine, ethylamine, diethylamine, propylamine, phenylenediamine, xylylenediamine, amphetamine.

A low-carbon near zero emission process of industrial waste water, comprising: S1: entering industrial waste water into a pre-oxidation system to improve biodegradability of organics; S2: after treatment in the pre-oxidation unit, entering the waste water into an anaerobic biological treatment system, sodium chloride and sulfate is deeply removed and carbon sources in the waste water can be used to remove the sulfate and nitrate; S3: entering water output from the anaerobic biological treatment system into a membrane concentration system and membrane concentrated solution enters a nano-filtration salt fractionation system for salt fractionation; and S4: refluxing nano-filtration concentrate solution generated by the nano-filtration salt fractionation system to the anaerobic biologic treatment system for biological desulfurization, or synthesizing the nano-filtration concentrate solution to be sodium persulfate by electro chemical methods, and refluxing proportionately to a waste water pre-oxidation system for use in-situ.