694 results about "Sodium nitrate" patented technology

The invention discloses a corrosion-resistant polypropylene edge band material and a preparation method thereof, and belongs to the technical field of preparation of edge band materials. The corrosion-resistant polypropylene edge sealing strip material is prepared from, by weight, 50-75 parts of polypropylene, 2-5 parts of an antioxidant, 3-6 parts of a corrosion-resistant agent, 2-4 parts of a composite flame retardant, 8-15 parts of calcium carbonate and 2-4 parts of dye, the corrosion-resistant agent is prepared from 2, 6-dichlorobenzonitrile, 1, 2, 4-triazole, a sulfuric acid solution, sodium nitrite and parachloroaniline, and the corrosion-resistant agent is prepared from 2, 6-dichlorobenzonitrile, 1, 2, 4-triazole, a sulfuric acid solution, sodium nitrite and parachloroaniline. The composite flame retardant is prepared from 3-glycidyl ether oxypropyl trimethoxy silane, diphenyl silanediol, barium hydroxide and boric acid. The edge band material prepared by the method has excellent corrosion resistance, flame retardance, heat resistance and mechanical properties.

The invention relates to a low-temperature graphite negative electrode material and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the prepared low-temperature graphite negative electrode material, firstly, the surface of graphite is pre-oxidized through potassium persulfate, phosphorus pentoxide and concentrated sulfuric acid, and then under the action of sodium nitrate, potassium permanganate and hydrogen peroxide, graphite oxide is prepared; then, ammonium molybdate hydrate and thioacetamide are used as a molybdenum source and a sulfur source, graphite oxide is used as a supporting material, a molybdenum disulfide-graphite compound is synthesized, and the conductivity and the cycling stability are improved; secondly, the surface of the negative electrode is coated with amorphous resin carbon / nickel oxide, so that the ion diffusion efficiency of the low-temperature graphite negative electrode material is enhanced, and the electrochemical lithium storage performance is improved in a low-temperature environment; and finally, the surface of the amorphous resin carbon / nickel oxide is coated with a layer of polythiophene film, so that the rate capability of the negative electrode material is improved due to large surface area and high pores.

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 and application of a Co-doped FeOOH catalyst, and the preparation method comprises the following steps: adding ferric trichloride and cobalt chloride hexahydrate into an organic solvent, and ultrasonically mixing and dissolving to form a uniformly mixed solution; adding sodium nitrate into the mixed solution, and stirring at room temperature to obtain a uniform mixed solution; dropwise adding a hydrochloric acid solution into the mixed solution, transferring the mixed solution into a high-pressure reaction kettle with a polytetrafluoroethylene lining, and carrying out hydrothermal reaction; after the reaction is finished, cooling to room temperature, centrifuging the obtained precipitate with ethanol and ultrapure water, washing, and carrying out vacuum drying; and cooling the product obtained after drying to room temperature to obtain the product Co-doped FeOOH catalyst. The invention provides a catalyst suitable for high-performance electrochemical ammonia synthesis for the first time, preferably a 6% Co-FeOOH catalyst, and the optimal ammonia catalysis effect is achieved.

The invention discloses a high-entropy P2-O3 composite system sodium ion positive electrode material, a preparation method thereof and a sodium battery, and belongs to a new energy material technology. The method comprises the steps that a first reactant, metal oxide and solid powder of a sodium source are blended, sintered and cooled, the component of the first reactant is NiyFezMn (1-3y-z) (OH) (2-4y), and the particle size of the first reactant is 1-20 micrometers; the metal oxide is any two of TiO2, MgO, Co3O4, SnO2, ZrO2, La2O3 and CeO2, and the particle size D50 of the metal oxide is less than or equal to 5 microns; the sodium source is selected from any one of sodium carbonate, sodium bicarbonate, sodium nitrate and sodium acetate, and the particle size D50 is less than or equal to 10 microns; the particle size of the first reactant is larger than the particle size D50 of the metal oxide, and the particle size D50 of the sodium source is larger than the particle size D50 of the metal oxide.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment method of high-concentration ammonia-nitrogen wastewater. The treatment method comprises the following treatment steps: (1) pretreatment of high-ammonia-nitrogen wastewater: adding an acidic solution into to-be-treated high-ammonia-nitrogen wastewater, adjusting the pH value of the system to 3 or below, then adding a regulating agent NaNO2, and uniformly mixing; and (2) high-temperature hydrothermal treatment: putting the mixed wastewater pretreated in the step (1) into a closed hydrothermal reactor, heating to 120-180 DEG C, carrying out high-temperature hydrothermal reaction, cooling after the reaction is completed, obtaining treated produced water, and collecting produced nitrogen. According to the treatment method, the hydrothermal reaction is regulated and controlled based on cooperation of acid and sodium nitrite, the method is carried out under high-temperature and high-pressure conditions, the reaction rate can be increased, the treatment time can be shortened, and the treatment efficiency can be improved. The problems that in an existing high-ammonia-nitrogen wastewater treatment technology, the ammonia nitrogen treatment concentration is low, the process technology is complex, and secondary pollution is generated are solved.

The present invention relates to a method for treating a bacterial infection by using Paracoccus wg1 T The invention relates to a method for treating wastewater containing high concentration of inorganic nitrogen, which belongs to the technical field of waste resource utilization and water environment treatment. T The seed liquid after culture is used to treat nitrogen-containing wastewater, and the Paracoccus wg1 of the present invention T , has a very high tolerance to high concentrations of inorganic nitrogen, and has excellent denitrification capabilities under conditions of high concentrations of inorganic nitrogen. Specifically, sodium nitrate is used as the nitrogen source, sodium propionate is used as the carbon source, NO3 ‑ When the ‑N concentration is 6258.85 mg / L‑N, 97.68 mg / L‑N of NO3 can be degraded in 48 hours ‑ -N; ammonium sulfate as nitrogen source, sodium propionate as carbon source, NH4 + When the ‑N concentration is 9326.28 mg / L‑N, 92.28 mg / L‑N of NH4 can be degraded in 48 hours + ‑N. paracoccus wg1 T Biological denitrification treatment of high-concentration inorganic nitrogen wastewater has great application prospects.

The invention discloses a compatible molybdenum-aluminum mixed acid etching solution which comprises the following components in percentage by mass: 4%-7% of nitric acid, 55%-65% of phosphoric acid, 17%-28% of acetic acid, 0.5%-3% of an oxidizing additive, 0.05%-5% of a metal corrosion inhibitor and 10%-20% of deionized water, and the oxidizing additive is ceric nitrate and at least one selected from sodium nitrate, potassium nitrate and ammonium nitrate; the etching liquid does not contain other organic components except for organic carboxylic acid and organic carboxylate. According to the compatible molybdenum-aluminum mixed acid etching solution, on the basis that ceric nitrate is introduced, the content of nitric acid is reduced, the nitrate ion concentration is increased by adding nitrate, the overall oxidation performance of an etching solution system is improved, the etching rate ratio of different metals is adjusted, CD-Bias is reduced, the etching dip angles of a molybdenum single layer and a molybdenum-aluminum laminated layer are controlled to be kept at 20-50 degrees, and the problem of aluminum thorns is solved. The invention further discloses a molybdenum-aluminum etching method based on the compatible molybdenum-aluminum mixed acid etching solution.

The invention discloses a preparation method of a porous metastable state iridium oxide composite catalyst, which comprises the following steps: uniformly mixing iridium salt, inorganic salt, metal salt, a dispersant and pre-ground sodium nitrate in a solvent, and adjusting the pH value of the solution to 1-3 to obtain a uniformly mixed solution; removing the solvent from the mixed solution to obtain a uniform powder mixture; uniformly grinding the powder mixture, and performing high-temperature roasting in a muffle furnace to obtain a composite metal oxide; and fully washing and drying the composite metal oxide to obtain the porous metastable iridium oxide composite catalyst. The iridium oxide is doped and compositely modified by adopting the inorganic salt, the metal salt and the pore-forming agent, the internal lattice structure, the electronic state and the void structure of the iridium oxide are adjusted, the catalytic activity and the stability are improved, and the method is simple, easy to implement, high in yield, capable of achieving large-scale mass production and beneficial to industrial application.

The invention discloses a nano phase change heat storage material with high decomposition temperature as well as a preparation method and application thereof, and belongs to the technical field of mixed molten salt energy storage materials. The nanometer phase change heat storage material is composed of 99 wt% of low-melting-point mixed molten salt and 1 wt% of SiO2 nanometer particles. The low-melting-point mixed molten salt is composed of potassium nitrate, sodium nitrite and sodium nitrate according to the mass ratio of 53: (10-30): (17-37). The low-melting-point and high-decomposition-temperature nanometer phase change heat storage material with the melting point being 150-175 DEG C and the decomposition temperature being 660-723 DEG C is prepared by combining the mixed molten salt composed of potassium nitrate, sodium nitrite and sodium nitrate according to the specific dosage ratio with SiO2 nanoparticles, the melting point of the phase change material is low, energy consumption can be effectively reduced, and the energy consumption is reduced. And the composition has good decomposition temperature, melting latent heat and other thermophysical properties.

The invention discloses a synthesis method of 2, 4, 5-trifluorophenylacetic acid, which comprises the following steps: by taking cheap and easily available o-chloronitrobenzene as a raw material, reacting with sodium nitrate in a sulfuric acid and trifluoroacetic acid system, separating generated 2, 4-dinitrochlorobenzene through melt crystallization, and continuing to synthesize 2, 4-dinitrochlorobenzene in methyl chloroacetate to obtain 2, 4, 5-trifluorophenylacetic acid. The method comprises the following steps: carrying out indirect aromatic nucleophilic substitution reaction on 2, 4-dinitrophenylacetic acid under the condition of sodium hydride to generate 5-chloro-2, 4-dinitrophenylacetic acid methyl ester, separating, carrying out fluorination reaction on the 5-chloro-2, 4-dinitrophenylacetic acid methyl ester and potassium fluoride under the action of a phase transfer catalyst, carrying out rectification separation to obtain 2, 4, 5-trifluorophenylacetic acid, and carrying out hydrolytic acidification on the 2, 4, 5-trifluorophenylacetic acid in a sodium hydroxide aqueous solution to obtain 2, 4, 5-trifluorophenylacetic acid. And the process route is safer, more environment-friendly, more efficient and lower in cost.

The invention belongs to the technical field of fire-extinguishing building materials, and particularly relates to a fire-extinguishing microcapsule and a preparation method thereof and a building material.The preparation method of the fire-extinguishing microcapsule comprises the following steps that 1, a monoethylenic bond compound, a polyethylenic bond compound, a fire extinguishing agent, an oxidizing agent and a stabilizer are mixed in sequence, and an oil phase A is obtained; adding a dispersing agent and salt into deionized water, heating, stirring, cooling, adding sodium nitrite, and uniformly stirring to obtain a water phase B; 2, adding the oil phase A into the water phase B, and stirring to obtain white dispersion liquid C; adding a reducing agent, an accelerant and a polyethylenic bond compound into the water phase B in which the emulsifier is dissolved, and stirring to obtain a white emulsion D; and step 3, dropwise adding the emulsion D into the dispersion liquid C, and removing a water phase to obtain the fire extinguishing microcapsule M. The preparation method has the beneficial effects that the obtained fire extinguishing microcapsule can be softened and broken at a certain temperature, a vaporized fire extinguishing agent is released, and active fire extinguishing is achieved in the early stage of a fire; safety and environmental protection.

The application relates to a method for one-step synthesis of strong magnetic hydrophobic Fe3O4 nanoparticles at low temperature and the Fe3O4 nanoparticles and application, and belongs to the technical field of nano material preparation. The method comprises the following steps: adding a ferrous sulfate solution into a mixed solution of sodium hydroxide and sodium nitrate, heating and stirring to react, adding oleic acid in the reaction process, and obtaining black Fe3O4 crystals after the reaction is completed. The saturation magnetization of the obtained strong magnetic hydrophobic Fe3O4 nanoparticles can reach 85.69 emu / g at most, and the water contact angle can reach 148.95 DEG. The one-step synthesis reaction only needs to use oleic acid as a regulator, avoids an extreme high-temperature and high-pressure environment, does not need to use a toxic chemical solvent, the condition is mild, the process is simple, the operation condition is easy to control, and the method has a wide application prospect.

The invention relates to the technical field of overhead conductors, and provides a high-conductivity overhead conductor which sequentially comprises a reinforcing core, an inner aluminum wire layer and an outer aluminum wire layer from inside to outside, each of the inner aluminum wire layer and the outer aluminum wire layer is formed by twisting a plurality of aluminum wires, and the reinforcing core is formed by twisting a plurality of galvanized steel wires; the preparation method of the reinforced core comprises the following steps that a steel wire is sequentially subjected to alkali washing, acid pickling, plating assisting, hot-dip galvanizing, passivation and twisting to obtain the reinforced core; during passivation, a passivation solution is prepared from, by weight, 20-25 parts of waterborne polyurethane, 15-20 parts of sodium silicate, 4-8 parts of sodium nitrate, 5-10 parts of modified graphene oxide, 3-5 parts of polyethylene glycol, 0.2-0.4 part of glacial acetic acid and 70-80 parts of water, and the modified graphene oxide is prepared from graphene oxide, a silane coupling agent and 3-aminopyrazine-2-carboxylic acid methyl ester. The problem of poor corrosion resistance of the overhead conductor in the prior art is solved.

The invention discloses a negative-electrode-free sodium ion battery, which comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the positive plate comprises a positive current collector, the surface of the positive current collector is coated with a positive active material, a positive conductive agent and a positive binder, the negative plate comprises a negative current collector, the surface of the negative current collector is coated with a carbon nanotube and polyvinylidene fluoride, the negative electrode current collector is a copper foil, the electrolyte comprises sodium salt and an organic solvent, the sodium salt is sodium nitrate, and the organic solvent comprises fluoroethylene carbonate, 1, 3-propane sultone and dimethyl sulfoxide. The negative-electrode-free sodium ion battery has the beneficial effects that the negative electrode does not use active materials and only uses CNT and PVDF, so that more positive electrode active substances can be accommodated in the battery, more electric energy can be stored under the same volume, and the energy density of the negative-electrode-free sodium ion battery is improved. No negative electrode active material is introduced, so that the cost is reduced and the manufacturing process is simplified. And meanwhile, by optimizing an electrolyte system, the growth of sodium dendrites is effectively inhibited, and the cycle life of the battery is prolonged.

The invention provides a preparation method of a chlorine salt conversion film with high corrosion resistance, which comprises the following steps: dissolving manganese chloride and calcium chloride in water, then adding ammonium dihydrogen phosphate, sodium nitrate and EDTA (Ethylene Diamine Tetraacetic Acid), and carrying out conversion treatment at 50-60 DEG C for 10-15 minutes to obtain a conversion film solution; placing the conversion film solution in a water bath kettle with the temperature of 50-60 DEG C for heating and heat preservation; the magnesium alloy is put into the conversion film solution to form a film for 10-15 min at the film forming temperature of 50-60 DEG C, and a conversion film is formed on the surface of the magnesium alloy; and taking out the magnesium alloy, washing and drying the conversion film, and characterizing. According to the preparation method of the chlorine salt high-corrosion-resistance conversion film, the preparation cost is low, and the prepared film layer is thick and uniform.

The invention belongs to the technical field of microalgae culture, and particularly provides a haematococcus pluvialis culture medium and a preparation method thereof.The haematococcus pluvialis culture medium is prepared from 1-3 mg / L of sodium acetate, 0.01-1 mg / L of cobalt nitrate hexahydrate, 0.01-1.6 mg / L of copper sulfate, 0.1-1.2 mg / L of zinc sulfate heptahydrate, 1-3 mg / L of manganese chloride tetrahydrate, 1-10 mg / L of boric acid, 1-30 mg / L of sodium carbonate, 1100-1500 mg / L of sodium nitrate, 0.01-6 mg / L of EDTA, 20-50 mg / L of calcium chloride, 70-100 mg / L of magnesium sulfate heptahydrate, 40-100 mg / L of monopotassium phosphate trihydrate and 0.02 g of inorganic phosphorus; the method comprises the following specific steps: S1, culturing haematococcus pluvialis to a stable phase by a conventional method, inoculating haematococcus pluvialis species into a haematococcus pluvialis culture medium, and culturing; s2, shaking table; s3, culturing for 45 hours; s4, inoculating the seed solution into a haematococcus pluvialis culture medium, and continuously culturing in the shaking table for 6-15 days; the culture medium disclosed by the invention has a good promotion effect on the growth of haematococcus pluvialis and the accumulation of astaxanthin.

The invention provides treatment equipment for ethanol and water mixed mother liquor and a sodium nitrate and potassium nitrate purification method, and relates to the technical field of waste liquid treatment, the treatment equipment comprises a flocculation box, a flocculation frame and a driving mechanism; a mounting plate is mounted at the top of the flocculation frame through bolts, the driving mechanism comprises a mounting frame mounted on the upper surface of the mounting plate, and a top plate and a bottom plate are fixedly arranged on the inner wall of the mounting frame. According to the scheme, in the overflowing and liquid discharging process, the water body in the flocculation box can be changed, flocculation groups with small sizes can turn over upwards, and the inclined plate with large initial inclination can block and capture the flocculation groups which turn over upwards, so that the flocculation groups are prevented from overflowing along with water flow through the inclined plate; meanwhile, the linkage plate can be adopted to control the multiple inclined plates to synchronously turn over in a linkage mode to change the inclination, flocculation groups captured on the inclined plates are shaken to be precipitated downwards, and it is guaranteed that overflowing and liquid discharging can be fast, so that waste liquid can be well flocculated, efficient and stable flocculation is guaranteed, and follow-up discharging or recycling is facilitated.

The invention provides an iridium-ruthenium oxide composite catalyst, a preparation method thereof and a proton exchange membrane water electrolysis device, and relates to the field of hydrogen production through water electrolysis. The preparation method of the iridium-ruthenium oxide composite catalyst comprises the following steps: mixing sodium nitrate, ruthenium chloride and water to prepare a mixed solution, and then drying and grinding to obtain a mixture; placing the mixture on the surface of nickel foil, carrying out first heating by using Joule heating equipment, and then cooling to obtain ruthenium oxide; mixing ruthenium oxide, hexadecyl trimethyl ammonium bromide and ethylene glycol, and performing ultrasonic dispersion to obtain a ruthenium oxide solution; and mixing the ruthenium oxide solution, H2IrCl6 and potassium hydroxide, adjusting the pH value of the system to be alkaline, then carrying out second heating until reflux and constant-temperature reaction, carrying out solid-liquid separation on the reaction product, and washing to obtain the iridium-ruthenium oxide composite catalyst. The iridium-ruthenium oxide composite catalyst provided by the invention has high activity, high stability and high water electrolysis efficiency.

The invention discloses a special low-conductivity cooling liquid for an electric vehicle and a preparation method thereof, and the special low-conductivity cooling liquid comprises ethylene glycol, sodium nitrate, octanoic acid, butyl phosphate, benzotriazole, a polyether modified organic silicon defoamer, triethanolamine, imidazole, pigment blue and limonin. The high-temperature-resistant and corrosion-resistant coating is prepared from the following components in percentage by mass: 95 to 100 percent of ethylene glycol, 0 to 0.05 percent of sodium nitrate, 0.2 to 0.4 percent of octanoic acid, 0 to 0.01 percent of butyl phosphate, 0.1 to 0.4 percent of benzotriazole, 0.05 to 0.1 percent of polyether modified organic silicon defoaming agent, 0.5 to 2 percent of triethanolamine, 0 to 0.3 percent of imidazole, 0.02 to 0.06 percent of pigment blue and 0.05 to 0.1 percent of limonin. On the basis of meeting the new national standard of the electric vehicle cooling liquid, the electric vehicle cooling liquid has low conductivity, fire caused by leakage of the cooling liquid can be effectively prevented, and the cooling liquid can effectively provide protection for a new energy electric vehicle system.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a sodium salt composition, a sodium-ion battery electrolyte and application thereof, and a sodium-ion battery. The sodium salt composition provided by the invention comprises any five or more of sodium bis (trifluoromethanesulfonyl) imide, sodium hexafluorophosphate, sodium difluoro (oxalato) borate, sodium fluoborate, sodium nitrate, sodium perchlorate and sodium difluorophosphate, and the solvation configuration of the sodium ion battery electrolyte prepared from the sodium salt composition is an aggregate with a multi-polar solvation shell layer, and a positive electrode surface solid electrolyte interface film (CEI) and a negative electrode surface solid electrolyte interface film (SEI) which are rich in inorganic matters can be formed, so that the positive electrode and the negative electrode are effectively protected, and the cycling stability and the rate capability of the sodium ion battery are improved.

The invention relates to the technical field of nano materials, and provides a preparation method and application of a NaxCoO2 nano thermoelectric material synthesized by combining a self-propagating method and a cold pressing method. The invention aims to solve the problems of low production yield, complex process, low orientation degree, poor crystallinity and high cost of the conventional NaxCoO2 preparation method and improve the application of the NaxCoO2 in heat energy collection in a high-temperature area. According to the main scheme, the preparation method comprises the following steps: dissolving sodium nitrate and cobalt nitrate hexahydrate in a citric acid solution in proportion, heating to self-propagating combustion to obtain precursor powder, calcining, tabletting to obtain a NaxCoO2 polycrystalline block, and annealing to improve the compactness; the preparation method is used in the fields of thermoelectric power generation in a high-temperature area, refrigeration, medical treatment, sensing and the like, has the advantages of simple process, high preparation speed, high yield, low cost, good crystallinity and high thermoelectric performance, realizes quick preparation of the high-temperature thermoelectric material with high thermoelectric performance and high crystallinity, and has relatively high commercial and practical values.

The invention belongs to the field of water electrolysis hydrogen production electrode materials, and particularly relates to a local amorphous porous iridium oxide, preparation thereof and application of the local amorphous porous iridium oxide in OER catalyst.The preparation method of the local amorphous porous iridium oxide comprises the steps that a mixed raw material of an iridium source, an organic-inorganic synergistic regulator and sodium-based composite salt is subjected to roasting treatment, and the local amorphous porous iridium oxide is obtained; and then carrying out quenching treatment to obtain the local amorphous porous iridium oxide. The organic-inorganic synergistic regulator comprises a La inorganic substance and an organic substance shown as a formula 1 (# imgabs0 #) in a weight ratio of (1-10): (10-50); the sodium-based composite salt comprises sodium nitrate and sodium chloride; in the formula 1, R is H, alkyl or substituted alkyl. The material prepared by the preparation method disclosed by the invention is excellent in performance under a high-temperature condition, and can stably operate under the conditions of frequent start and stop and large current.

The invention belongs to the field of textile dyeing and finishing, and relates to a dyeing method capable of regulating and controlling in-situ assembly of dye molecules through cellulose fiber graft modification. The dyeing method comprises the following steps: soaking a cellulosic fiber textile in a 4-beta-hydroxyethylsulfonyl sulfate aniline-2-sulfonic acid aqueous solution for reaction, washing with water, drying, soaking in a hydrochloric acid aqueous solution, adding a sodium nitrite aqueous solution for reaction, adding urea, washing with water, and drying to obtain the cellulosic fiber textile. Soaking in a coupling component aqueous solution containing a coupling component, sodium hydroxide and sodium carbonate for reaction, alternately washing with hot water and cold water, and drying to obtain the dyed textile. The dyeing method is mild in condition, dye hydrolysis is avoided, the dye uptake and the dyeing fastness are improved, and the dye utilization rate is high; high temperature and a large amount of inorganic salt or auxiliaries are not needed, the dye is directly generated and fixed in the fiber, energy consumption is remarkably reduced, and waste water treatment pressure is reduced.

The invention relates to a part and an electrophoretic coating process and application thereof, and belongs to the technical field of electrophoretic coating. The zirconium treatment liquid provided by the invention comprises hexafluorozirconic acid, aluminum nitrate, nitric acid, hydrogen fluoride and sodium nitrite; wherein aluminum nitrate can reduce the concentration of free fluorine in the treating fluid and promote hydrolysis of hexafluorozirconic acid, so that the generation speed of a zirconium film is increased; and the sodium nitrite can prevent the part base material from rusting, so that the anti-rust treatment after zirconium treatment is omitted. A part only needs to be subjected to zirconium treatment in the zirconium treatment liquid for 120 s, a zirconium film with the film weight being 48 mg / m < 2 > can be obtained, anti-dry spraying or anti-rust agent spraying does not need to be carried out after zirconium treatment to prevent the part from being rusted, and compared with the prior art, the efficiency of the electrophoretic coating process is improved; the parts subjected to electrophoretic coating are still free of corrosion after being subjected to a salt spray test for 1000 hours, and compared with the prior art, the performance is greatly improved.

The utility model discloses a coal chemical industry wastewater crystal salt resource recycling system which comprises a pretreatment softening device, a waste water recycling device and a waste water recycling device, an evaporation concentration device; a first evaporative crystallization system; a first freezing crystallization device; a second evaporative crystallization system; and a second freezing crystallization device. According to different properties of sodium sulfate, sodium chloride and sodium nitrate, the sodium sulfate, the sodium chloride and the sodium nitrate are crystallized and separated through the pretreatment softening device, the evaporation concentration device, the first evaporation crystallization system, the first freezing crystallization device, the second evaporation crystallization system and the second freezing crystallization device, so that the obtained sodium sulfate, the sodium chloride and the sodium nitrate reach industrial recycling standards; therefore, zero discharge and resource utilization of the wastewater are realized.

The utility model provides a tail gas treatment device for sodium nitrate production equipment by a neutralization method, which comprises a tail gas air pipe (20), an induced draft fan (2) and an exhaust funnel (6), a primary absorption tower (3) and a secondary absorption tower (4) which are connected in series with a reaction kettle (1) are communicated by the tail gas air pipe (20), an upper air outlet of the secondary absorption tower (4) is connected with the exhaust funnel (6), and the upper side of the exhaust funnel (6) is communicated with the atmosphere. And a sodium bicarbonate solution is sprayed in the first-stage absorption tower (3) and the second-stage absorption tower (4). The induced draft fan (2) is used for generating negative pressure in the reaction kettle (1), tail gas is sucked out, and the tail gas can be prevented from leaking from the sampling opening (11) and the simple manhole (12). The first-stage absorption tower (3) and the second-stage absorption tower (4) are used for spraying sodium bicarbonate to neutralize tail gas generated in the neutralization reaction, the treated tail gas does not contain nitric oxide any more, the treatment process is simple, consumed materials are few, and the cost is low.

The invention discloses a nitric acid-hydrofluoric acid type stainless steel pickling waste liquid resource utilization method, and belongs to the technical field of waste water resource utilization. The method comprises the steps of precipitation reaction, manganese sand filtration, electrodialysis, reverse osmosis and evaporative crystallization. Firstly, mixed precipitates are obtained through precipitation reaction; concentrating the obtained filtrate by adopting an electrodialysis technology, and recovering by adopting an evaporative crystallization mode to obtain a sodium nitrate product; and the produced water can meet the requirement of make-up water (GB / T 19923-2024) of a circulating cooling water system through a reverse osmosis technology. According to the method, the technologies of chemical precipitation, membrane separation, evaporative crystallization and the like are comprehensively adopted to extract and recover iron ions, fluorine ions, nitrate ions and the like in the stainless steel pickling waste liquid in the form of inorganic matters, and meanwhile, produced water in the recovery process reaches the standard of circulating cooling water. According to the method, the stainless steel pickling waste liquid can be recycled, meanwhile, produced water is recycled, and pollution to the environment is reduced.

The invention relates to a microcrystalline plate produced on the basis of hazardous waste incineration ash, which comprises fly ash, bottom slag, silica sand, anhydrous sodium carbonate, sodium nitrate, anhydrous potassium carbonate, sodium fluosilicate, stannic oxide, nickel oxide, cobalt oxide, anhydrous borax, cerium dioxide, manganese dioxide and lanthanum oxide, an all-electric melting glass kiln is adopted for vitrification, a crystallization process adopts a one-step method for crystallization, and the crystallization process adopts a one-step method for crystallization. The fly ash and the bottom slag are obtained by incinerating medical wastes belonging to hazardous wastes in a rotary kiln, and are belonging to hazardous wastes; the method not only helps to solve the problem of disposal of the medical waste incineration ash, but also can promote development of the green building material industry, and conforms to the strategic target of sustainable development.

The application belongs to the technical field of metallurgy, and relates to a method for efficiently purifying and directionally removing oxygen and impurities from a precious antimony alloy, which comprises the following steps: S1, after the precious antimony alloy is melted, an arsenic-tellurium removal agent is added, and smelting is performed at 600-610 DEG C to obtain a pre-impurity removal alloy melt and an arsenic-tellurium residue; the arsenic-tellurium removal agent is a mixture of sodium hydroxide and sodium nitrate; S2, the pre-impurity removal alloy melt obtained in step S1 is heated to 620-640 DEG C, a reducing agent is added, and smelting is performed to obtain an arsenic alkali residue and a refined antimony alloy; the reducing agent is a mixture of antimony sulfide and sodium hydroxide; S3, the arsenic-tellurium residue obtained in step S1 and the arsenic alkali residue obtained in step S2 are ball milled, leaching and filtration are performed to obtain a filtrate and a filter residue; S4, the filtrate obtained in step S3 is mixed with sulfuric acid, and after reaction, a neutralization residue and a neutralization liquid are obtained. By introducing the efficient arsenic-tellurium removal agent and the reducing agent, the content of antimony in the arsenic alkali residue is significantly reduced, and the direct recovery rate of antimony and the recovery rate of tellurium are effectively improved.