90 results about "Hydrogen Sulfate" patented technology

The invention discloses a composite browning liquid for a printed circuit board and a preparation method of the composite browning liquid. The composite browning liquid comprises the following components: 60-85 g / L of 98 wt% concentrated sulfuric acid, 12-20 g / L of 30 wt% hydrogen peroxide, 1-2 g / L of a modified corrosion inhibitor, 8-14 g / L of a silane coupling agent, 1.5-3 g / L of 1-butyl-3-methylimidazolium hydrogen sulfate, 4-8 g / L of an impregnating compound, 5-8 g / L of a dispersing agent and the balance of deionized water. The modified corrosion inhibitor prepared by a specific method, the silane coupling agent, the ionic liquid and the compound surfactant are scientifically compounded, so that the copper surface treatment effect is remarkably improved, and the inherent contradiction between binding force improvement and over-etching prevention of a traditional browning liquid is solved; the browning liquid has the advantages of stable treatment effect, long service life, reduction of waste liquid output and the like, and is suitable for industrial production requirements of high-density printed circuit boards.

The invention relates to a method for comprehensively recycling a positive electrode material of a waste lithium iron phosphate battery, which comprises the following steps of: (1) discharging the waste lithium iron phosphate battery: providing a power supply by the waste lithium iron phosphate battery, and electrolyzing a lithium precipitation mother solution by using a three-chamber diaphragm electrolytic bath; (2) crushing and sorting; (3) two-stage leaching: leaching the lithium iron phosphate positive electrode powder with a sulfuric acid solution generated by electrolysis of a lithium precipitation mother solution, and adding an aeration disc at the bottom of a reaction kettle for aeration; adding a dilute sulfuric acid solution generated by electrolysis of lithium precipitation mother liquor into first-section leaching residues for leaching; (4) two-stage impurity removal; and (5) preparing lithium carbonate. According to the method, the lithium precipitation mother liquor for the waste lithium iron phosphate battery is discharged to prepare the sulfuric acid and sodium hydroxide-lithium hydroxide mixed solution for production, so that residual electricity is utilized, a production reagent is saved, and the problems of high energy consumption, large lithium loss and poor sale of a byproduct sodium sulfate in evaporative crystallization of sodium sulfate are solved; and the aim of circularly and comprehensively utilizing the waste lithium iron phosphate battery is fulfilled.

The present application belongs to the technical field of flue gas purification, and discloses a kind of automatic adjusting device of denitration ammonia injection gate, including wind pressure sensing element, pressure regulating opening device, temperature feedforward regulating device on ammonia injection head, according to mechanical mode automatic adjusting ammonia injection gate opening, realize according to flue gas volume automatic adjusting the ammonia injection amount of each ammonia injection gate;Device realizes the automatic control and adjustment of on-site equipment, both meets the national environmental protection to thermal power plant NO x The emission requirement, also reduces the consumption of ammonia injection of power plant, for sulfur-containing coal, reduces the generation of sulfuric acid hydrogen ammonium, avoids the plugging and hardening problem of air preheater, dust collector and tail flue, does not increase flue resistance, does not increase the specific consumption of induced draft fan, and does not cause the problem of unit load limitation.

The application discloses a preparation and by-product recycling process of acesulfame potassium, and belongs to the technical field of food additive production and processing. Amino sulfonic acid is added into N-butyl pyridine hydrogen sulfate ionic liquid and triethylamine in batches to obtain a homogeneous mixed solution; secondly, the mixed solution and diketene are introduced into a micro-channel reactor to perform a condensation reaction; and the discharge liquid is introduced into a polystyrene sulfonic acid resin loaded SO3 fixed bed reactor to perform a cyclization reaction; subsequently, the cyclization product is subjected to hydrolysis, decolorization, potassium salt crystallization and drying to obtain the acesulfame potassium product; and the crystallization mother liquor is separated through a nanofiltration membrane, and the intercepted liquid is an ionic liquid and triethylamine mixture, which is directly reused. The application inhibits the self-polymerization of diketene through the micro-channel reactor, replaces concentrated sulfuric acid with solid acid to avoid waste acid pollution, and realizes efficient recycling of by-products by combining nanofiltration membrane separation and catalytic depolymerization technology, and has the characteristics of green environmental protection and economic efficiency.

The present application relates to the technical field of catalyst regeneration, and discloses a regeneration method of deactivated denitration catalysts. The regeneration method comprises the following steps: (1) performing at least one heat treatment on the deactivated denitration catalyst monomer; (2) placing the deactivated denitration catalyst monomer after heat treatment in an electrolyte solution for electrochemical treatment, and then performing rinsing; (3) placing the deactivated denitration catalyst monomer after rinsing in a mechanical reinforcement solution and an active component supplement solution in sequence for impregnation; and (4) performing oxidation calcination on the deactivated denitration catalyst monomer after impregnation, and then performing reduction. The method can perform overall regeneration on the deactivated denitration catalysts caused by metal elements such as Fe, Pb, Cu and As, organic matters such as COD, and hydrogen sulfate ammonium type miscellaneous salts, the regenerated denitration catalyst obtained can maintain the integrity of the structure, has higher mechanical strength and catalytic activity, and can be directly put into use.

The utility model relates to the technical field of powder packaging, in particular to a powder dredging structure of potassium hydrogen persulfate compound powder filling equipment, which comprises filling pipes arranged at the lower ends of filling barrels and supplementing barrels, and the filling pipes are fixedly connected with the respective filling barrels or supplementing barrels through connecting parts; a scraping plate is slidably connected to the inner wall of the filling pipe, the top of the scraping plate is arranged in the connecting part, and a driving mechanism is further arranged in the connecting part and used for driving the scraping plate to rotate along the inner wall of the filling pipe. And a scraping plate is arranged in the filling pipe and is in sliding connection with the inner wall of the filling pipe. After filling is completed every time, the scraping plate rotates by a circle along the inner wall of the filling pipe, so that the potassium hydrogen sulfate compound powder remaining on the inner wall of the filling pipe can be effectively scraped off, and the potassium hydrogen sulfate compound powder falls into a potassium hydrogen sulfate compound powder packaging box. Not only is waste avoided, but also the problem of residual potassium hydrogen sulfate compound powder in the filling pipe is effectively solved, and meanwhile, the residual potassium hydrogen sulfate compound powder is prevented from drifting everywhere.

Disclosed is an alkali metal ion conductor which behaves as a liquid at a low temperature. The alkali metal ion conductor of the present disclosure is an alkali metal ion conductor comprising a salt, wherein the salt comprises a first cation, a second cation, and a first anion, the first cation is a tetraalkylammonium ion having an alkyl chain length of 5 or more, the second cation is an alkali metal ion, and the first anion is at least one anion selected from the group consisting of a bromine ion, a chlorine ion, and a hydrogen sulfate ion.

The invention relates to the technical field of superconducting material surface treatment, and particularly discloses an electrochemical polishing solution for a superconducting niobium material and application of the electrochemical polishing solution. The polishing solution is formed by mixing 98wt% of concentrated sulfuric acid, 40wt% of hydrofluoric acid and absolute ethyl alcohol according to the volume ratio of 5: 1: 1. Compared with a traditional 9: 1 binary system, absolute ethyl alcohol is introduced to serve as a key third component, the acid-base ratio is optimized, and a ternary synergistic system is constructed. The absolute ethyl alcohol plays multiple functions of inhibiting pitting corrosion, improving the wettability and mass transfer process, controlling reaction kinetics and the like in a system, and has a synergistic effect with the adjusted acid proportion, so that the problems that pitting corrosion is easy to generate, the surface uniformity is poor and a process window is narrow in a traditional formula are effectively solved. The polishing solution is particularly suitable for carrying out 30-second short-time efficient polishing on the superconducting niobium plate under the condition of 15V direct-current voltage, and a pitting-corrosion-free and low-roughness ultra-smooth surface can be stably obtained.

The application relates to a preparation method of esconazole sulfate. The method comprises realizing esconazole salt type conversion through nanofiltration in the presence of sulfate and / or hydrogen sulfate ions, and obtaining esconazole sulfate of formula I. The esconazole salt type conversion method is short in steps, simple in operation, low in cost, high in purity and yield, and easy to realize industrial production.

This invention provides a method for recovering lithium from lithium-containing aluminum electrolyte waste, relating to the field of lithium-containing waste resource utilization. The lithium-containing aluminum electrolyte waste is mixed with a calcium-containing substance and roasted. The calcium-containing substance includes a first calcium-containing substance and a second calcium-containing substance. The first calcium-containing substance is at least one selected from calcium sulfate, calcium bisulfate, calcium carbonate, or calcium bicarbonate. The second calcium-containing substance is at least one selected from calcium carbonate, bicarbonate, sulfate, bisulfate, hydroxide, oxide, or chloride. The molar ratio of calcium in the calcium-containing substance to aluminum in the lithium-containing aluminum electrolyte is controlled at 1-4:1. The molar amount of calcium in the carbonate, bicarbonate, sulfate, and bisulfate is 40%-80% of the total molar amount of calcium in the calcium-containing substance. After roasting, the roasted clinker is mixed with an acidic leachate for lithium extraction. This method significantly improves the lithium leaching rate and effectively and selectively recovers high-value lithium from lithium-containing aluminum electrolytes.

The utility model relates to potassium hydrogen sulfate composite powder processing technical field, concretely relates to a kind of potassium hydrogen sulfate composite powder premixing mechanism, including support seat, the potassium hydrogen sulfate composite powder premixing mechanism further includes: cradle is rotationally arranged on the support seat, mixing tank is rotationally arranged in the cradle, the drive part for driving mixing tank autorotation, several helical blades are fixed in the mixing tank inside circumferentially uniformly, and the mixing area is formed by surrounding between adjacent two helical blades.The utility model can autorotate mixing tank under the driving of drive part after raw material is filled and tightened can cover, and cradle is reciprocatingly deflected along mixing tank axial under the driving of reciprocating driving element, so that raw material flows, rolls mixing in mixing tank, greatly weaken the collision, vibration degree in mixing process of raw material, improve mixing effect.

The present disclosure relates to an improved method to produce hydrofluoric acid from an aqueous sulfuric acid–hydrofluoric acid solution. Aspects of the disclosure are directed to a method where forced circulation under pressure is used to generate a hot liquid stream that is vaporized to produce a hydrofluoric acid vapor–water vapor stream comprising essentially only water and HF. Additionally, there may be a liquid recycle.

This application provides a method for recycling lithium-aluminum-silicon glass waste, relating to the field of solid waste resource utilization. The method includes: mixing lithium-aluminum-silicon glass waste powder with additives, calcining to obtain a calcined material, wherein the additives include sodium and calcium salts, the sodium salt including at least one of sodium sulfate and sodium bisulfate, and the calcium salt including at least one of calcium sulfate and calcium bisulfate. The molar amount of calcium in the additives is more than 0.4 times the molar amount of aluminum in the lithium-aluminum-silicon glass waste, and the molar amount of sodium is more than 0.9 times the molar amount of aluminum in the lithium-aluminum-silicon glass waste. The calcined material is then mixed with a leaching agent for leaching. The lithium-containing leaching solution of this application contains few types and amounts of impurities, and high-purity lithium compounds can be prepared after simple impurity removal treatment. This enables efficient recovery and reuse of valuable elements in low-value lithium-aluminum-silicon glass waste, solving the environmental pollution problem caused by glass waste stockpiling and reducing space occupation.

The invention relates to a molecular resist composition and a pattern forming method. The present invention addresses the problem of providing: a molecular resist composition having excellent sensitivity, resolution, and LWR in optical lithography using high-energy rays; and a pattern forming method using the molecular resist composition. The present invention is a molecular resist composition characterized by containing a sulfonium salt represented by the following formula (1) or (2), a salt containing a cation represented by the following formula (1-1) and a halide ion, a nitrate ion, a hydrogen sulfate ion, a bicarbonate ion, a tetraphenylborate ion or an anion represented by any one of the following formulae (1-2)-(1-8), and an organic solvent, and no base polymer is contained.

The invention belongs to the technical field of ion detection, and particularly relates to a preparation method of a long-wavelength emission fluorescent probe for rapidly detecting bisulfite, which comprises the following steps: dissolving isophorone and malononitrile in ethanol to obtain a product 1; 3-bromoquinoline and 5-formyl-2-thiopheneboronic acid are dissolved in a mixed solvent of dry methanol and dry toluene, and a product 2 is obtained; dissolving the product 2 in dichloromethane, and adding methyl trifluoromethanesulfonate to obtain a product 3; and dissolving the product 1 and the product 3 in ethanol, and adding piperidine to obtain the required fluorescent probe LSQ. Dissolving the obtained fluorescent probe LSQ in DMSO to prepare mother liquor A; a target product is obtained. The fluorescent probe provided by the invention has the advantages of high-selectivity rapid response to bisulfite, long-wavelength emission, no organic solvent detection, simple synthesis route and simple and convenient detection equipment and method, and can be used for qualitative and quantitative detection of bisulfite in food and biological systems.

This invention proposes a method for recycling waste lithium titanate anode materials, comprising the following steps: S1: The recycled lithium titanate anode material is calcined once, and the resulting calcined material is mixed with a mixture containing an acidic salt and an additive under pressure. After the reaction, solid-liquid separation is performed to obtain a lithium extraction solution and a leaching residue; wherein, the acidic salt is at least one of a hydrogen sulfate or an ammonium salt; the additive is at least one of barium chloride or calcium chloride; the reaction pressure is 0.3~0.6 MPa. After pressurized selective leaching of the lithium titanate anode material, the lithium extraction solution can be purified to obtain battery-grade lithium carbonate products, and the leaching residue can be used to prepare high-value-added titanium-based adsorbent precursors.

The invention discloses a micromolecular oil-based gel breaker as well as a preparation method and application thereof, and belongs to the technical field of product oil pipeline maintenance. The micromolecular oil-based gel breaker is selected from one or two of the following effective components in parts by weight: 1-10 parts of triethanolamine, 1-10 parts of sodium persulfate, 1-10 parts of sodium hydrogen sulfate and 1-10 parts of sodium sulfite, and 80-100 parts of water is used as a solvent. Compared with the existing gel breaker, the small molecule oil-based gel breaker has the advantages that the gel breaking time is shortened by 30-50%, and the shortest time can reach 15 minutes; by using weak acid and weak base, the corrosion to the carbon steel pipeline is low; meanwhile, the gel breaker mainly aims at phosphate aluminum salt gel and alkyl phosphate gel left in the pipeline, depends on the acid-base effect and the oxidation-reduction effect to act respectively or achieve the chemical synergistic effect, the formula of the gel breaker can be selected according to actual requirements, and the pertinence is high; the gel breaker provided by the invention also has the advantages of excellent environmental friendliness and controllable cost.

A method for producing ammonium nitrate includes a nitrogen dioxide recovery step of bringing nitrogen dioxide in a cement exhaust gas into contact with water to obtain an NOx-containing solution, a reduction reaction step of producing ammonia by bringing a reducing catalyst into contact with the NOx-containing solution, an ammonia recovery step of vaporizing the ammonia with a waste heat gas, a solid-liquid separation step of separating a residue after the ammonia recovery into iron hydroxide and an unused residue of NOx, a neutralization step of bringing the separated nitrate / nitrite nitrogen-containing solution and the NOx-containing solution into contact with the ammonia vaporized and recovered to prepare ammonium nitrate, and a catalyst production step in which magnetite used in the reduction reaction step is obtained by reacting iron sulfate with a sodium hydroxide aqueous solution and separating the mixture into solid and liquid, the sodium sulfate aqueous solution in the solid-liquid separation is separated into sodium hydroxide and sulfuric acid by electrodialysis, and the sodium hydroxide is used in a circulatory manner for preparing the magnetite, where the nitrogen dioxide in the cement exhaust gas is treated simply and efficiently while reducing environmental burden.

Disclosed is a synthetic method of sulfamerazine, relating to the technical field of drug preparation. Acetone and methyl formate are used as initial raw materials, and subjected to condensation reaction to obtain a compound 2; the compound 2 is subjected to addition reaction in a medium of methyl hydrogen sulfate to obtain a compound 3; the compound 3 is subjected to cyclization reaction in a medium of sulfaguanidine to obtain a compound 4; and the compound 4 is subjected to acidification in an acidic medium to obtain the sulfamerazine.

The present application relates to a kind of lignocellulose efficient pretreatment method, lignocellulose is loaded into stirred tank, after adding calcium bisulfite stirring uniformly, it is sent to reactor by feeder.Low-pressure steam is introduced to carry out steam explosion, and material is separated by cyclone separator and is sent to hydrolysis kettle for hydrolysis.After steam is sprayed, it is recycled by steam return air duct, and is used for the heating of pipeline and hydrolysis kettle.The present application can significantly improve the pretreatment effect of lignocellulose using calcium bisulfite as accelerator: reaction temperature is low, energy is saved, and the generation of enzymatic hydrolysis and fermentation inhibitor is reduced;The solid content of pretreatment liquid is high, more conducive to large-scale production;And calcium bisulfite is converted into calcium sulfate precipitate after pretreatment, and additional detoxification treatment is not needed.Lignocellulose raw material pretreated using the method is used for simultaneous saccharification and fermentation to produce lactic acid, and the lactic acid concentration in fermentation broth can reach 98 g / L, and the lactic acid yield can reach 42.4 g / 100g lignocellulose.

The present disclosure introduces a method for recycling the acid, base, and salt reagents required in Li recovery processes. A membrane electrolyzer containing oxygen-depolarized cathodes is implemented to produce the required chemicals on-site. The system can utilize a portion of the salt marsh brine or other lithium-containing brines or solid waste to produce hydrochloric or sulfuric acid, sodium hydroxide, and carbonate salts. The simultaneous production of acid and base enables the utilization of both chemicals in conventional processes for Li recovery from brines and mineral rocks. Desalted water can also be used in washing steps in the recovery process or returned to the evaporation ponds. The process can also be used to convert lithium salts directly to the high-value LiOH product. The process does not produce any solid effluents, which makes it easy to implement in existing industrial Li recovery facilities.

The invention discloses a waste liquid treatment method for preparing O-methylisourea hydrogen sulfate by a urea method, which aims at overcoming the defects of an organic acid-containing waste liquid treatment method which is high in organic matter content, low in moisture content, high in acid content, high in temperature and explosive, adopts a combined treatment method of alkali and a dispersing agent, and gasifies the dispersing agent through heat generated in a neutralization process; according to the present invention, the heat in the whole reaction process is removed so as to ensure the safety of the reaction process, and the presence of the dispersant reduces the viscosity of the system, simplifies the by-product preparation steps, improves the by-product quality, has advantages of high resource utilization rate, low equipment requirement, low waste liquid component requirement, and effective hazardous waste amount reduction; meanwhile, the dispersing agent can be repeatedly used, the treatment method is simple, the treatment time is short, the treatment efficiency is high, and the method has good environmental benefits and is suitable for large-scale popularization and application.

This invention discloses a method for the zero-carbon resource utilization of phosphogypsum and desulfurized gypsum to prepare acids, bases, and highly active calcium, relating to the field of phosphogypsum and desulfurized gypsum recycling technology. The process involves thoroughly washing phosphogypsum and desulfurized gypsum, reacting them with sodium carbonate, followed by flotation, solid-liquid separation, multi-stage membrane filtration, chelating resin adsorption, and bipolar membrane electrodialysis to produce sulfuric acid, sodium hydroxide, and circulating purified water. The floated material undergoes solid-liquid separation, drying, calcination, and fluidized bed reaction to produce calcium hydroxide, while simultaneously enriching and separating heavy metals. The fluidized bed waste heat is used for cascaded power generation, and the tail gas from the electromagnetic rotary kiln is treated with sodium hydroxide absorbent to generate sodium carbonate, achieving full element recovery, zero new waste emissions, and zero carbon emissions in the production process. The process is highly efficient and energy-saving, producing high-purity products suitable for industrial applications.

The application discloses graphene oxide / nano-carboxyl chitosan in-situ grafting fabric and a preparation method thereof. Graphene oxide is dissolved in N-methyl imidazole hydrogen sulfate ionic liquid ([Hmim]HSO4), and under the action of ultrasonic waves, nano-carboxyl chitosan dispersion liquid is added dropwise to react with graphene oxide sheet layers to obtain graphene oxide / nano-carboxyl chitosan composite. Then, the graphene oxide / nano-carboxyl chitosan composite is subjected to in-situ grafting reaction with fabric in N-methyl imidazole hydrogen sulfate ionic liquid through microwave radiation to obtain graphene oxide / nano-carboxyl chitosan in-situ grafting fabric. The application has the advantages of simple preparation process, controllable reaction condition, fast in-situ grafting reaction rate, no use of chemical cross-linking agent and additive, and the like. The prepared modified fabric has the advantages of significantly enhanced antibacterial activity, ultraviolet resistance and wrinkle resistance, good function durability, green environmental protection, and wide market prospect.

The invention relates to a preparation process of high-durability toughened glass with an anti-fingerprint function, which comprises the following steps: inserting glass into a toughened frame, and ultrasonically cleaning the glass; putting the tempering frame into a tempering cage and preheating, transferring the tempering cage to a tempering furnace for tempering after preheating, annealing after tempering the glass, transferring into a clear water tank for water decomposition treatment, and then carrying out ultrasonic cleaning to obtain tempered glass; after the tempered glass is preheated, the tempering cage is moved to a secondary tempering furnace to be tempered, annealing is conducted after tempering, the tempered glass is transferred into a clear water tank to be subjected to water decomposition treatment, and then ultrasonic cleaning is conducted to obtain secondary tempered glass; the formula of the secondary tempering molten salt comprises 88 wt%-94 wt% of potassium nitrate, 5 wt%-10 wt% of sodium nitrate, 0.8 wt%-1.5 wt% of fluoropolyether trimethoxy silane and 0.3 wt%-2.0 wt% of sodium hydrogen sulfate. According to the invention, fluoropolyether trimethoxysilane is introduced into a secondary tempering molten salt formula, and is chemically bonded with the glass surface to form a silicon-oxygen covalent bond, so that the hydrophobic and oleophobic properties and fingerprint adhesion resistance of the glass surface are enhanced, the weather resistance and durability of an anti-fingerprint layer are improved, and the synchronous improvement of the anti-fingerprint function and high durability is realized.

The present invention provides: a novel additive containing an ionic liquid that can be used for a composition for forming a cathode catalyst layer of a polymer electrolyte fuel cell; a novel composition for forming a cathode catalyst; and a novel cathode catalyst layer formed using the same.　The present invention relates to a composition for forming a cathode catalyst layer of a polymer electrolyte fuel cell, the composition containing an ionic liquid represented by formula (1). In the formula, X represents an atomic group containing a nitrogen atom or a phosphorus atom; Y represents a hydrogen atom, a carboxy group, or a sulfonic acid group; Z-represents a hydrogen sulfate anion, a trifluoromethanesulfonate anion, a bis(trifluoromethylsulfonyl)imide anion, a halogen anion, a tetrafluoroborate anion, a hexafluorophosphate anion, a bis(fluorosulfonyl)imide anion, or a nonafluorobutanesulfonate anion; and n represents an integer of 2-4.

A coating for a medical device is described. The coating comprises: a surface layer; and optionally a base layer; wherein the surface layer comprises a polymer chain attached to an anti-clotting group, wherein the anti-clotting group is selected from a sulfonic acid group, a sulfonamide group, a sulfamic acid group, a hydrogen sulfate group and a conjugate base thereof. Also described is a medical device comprising the coating, and uses and methods involving the coating and the medical device.

A wire electric discharge machining device according to an aspect of the present disclosure is for electric discharge machining of an aluminum-based material, wherein a machining fluid used in electric discharge machining contains at least one kind of cation from among potassium ions, calcium ions, sodium ions and magnesium ions and at least one kind of anion from among sulfate ions, sulfite ions, disulfite ions, hydrogen sulfite ions, hydroxide ions, nitrate ions and nitrite ions.

The invention provides a method for recovering magnesium and lithium in brine. The method comprises the following steps: performing pretreatment and nanofiltration on the brine; collecting a permeate and a concentrated solution after nanofiltration, and performing magnesium recovery on the concentrated solution; eluting the permeate after the permeate is adsorbed, and collecting a lithium-containing solution; an adsorbent selected for adsorption is modified manganese oxide; the modified manganese oxide is prepared from the following preparation raw materials: phosphorus modified carbon nitride, silane, 1-butyl-3-methylimidazole bis (trifluoromethanesulfonyl) imide salt, 1-sulfobutyl-3-methylimidazole hydrogen sulfate and an aluminum-nickel co-doped manganese lithium oxide. According to the method, brine is pretreated, so that the risk of pollution of the brine to a nanofiltration membrane is reduced, the pretreated brine is pumped into a nanofiltration system, and trapped fluid enriched with magnesium and sulfate ions and high-lithium permeate liquid are generated; by utilizing the selectivity of the nanofiltration membrane on monovalent / divalent ions, crude separation of magnesium and lithium is realized, and the load of a subsequent adsorption unit is greatly reduced; and fine extraction is carried out through adsorption, so that the purity of a final lithium product is improved.

This invention relates to a method for preparing a nitric oxide absorbent for flue gas from a coal-fired power plant and its application, comprising the following steps: preparing tridentate aldehyde through a multi-step organic synthesis reaction; preparing triangular prism cage-like molecules; preparing a nitric oxide absorbent stock solution; and formulating the nitric oxide absorbent. The beneficial effects of this invention are: employing the principle of physical adsorption, the triangular prism cage-like compound captures NO through physical adsorption, and through desorption, high-purity nitric oxide gas can be obtained and reused for NO molecule absorption. This method is safer than traditional chemical methods, effectively avoiding the environmental hazards caused by ammonia escape and the impact of byproducts such as ammonium bisulfate on the normal operation of the unit, and also features high recycling rate and long service life.