722 results about "Bromine" patented technology

The invention provides a preparation method of an acid-resistant and chlorine-corrosion-resistant porous composite electrode and a device constructed on the basis of the electrode and used for preparing hydrogen and chlorine by electrolyzing a sodium chloride solution, two cavities are provided, an acid or neutral saturated sodium chloride solution is filled in the cavities, the cavities are separated by a proton exchange membrane or a diaphragm, and the proton exchange membrane or the diaphragm is filled in the cavities. And in the electrolysis process, the cathode generates high-purity hydrogen, the anode generates high-purity chlorine, the chlorine is absorbed by sodium hydroxide in the gas collection bottle and generates sodium hypochlorite, or the chlorine is introduced into a sodium bromide / sodium iodide solution to replace bromine / iodine elementary substances, and the chlorine is discharged from the gas collection bottle. The sodium hypochlorite solution and the bromine / iodine water are used for disinfection and sterilization experiments. The corrosion-resistant porous composite electrode for electrolysis of an acidic or neutral saturated sodium chloride solution is prepared, the electrolysis voltage of the corrosion-resistant porous composite electrode is further reduced by loading a cathode / anode catalyst, and an acidic or neutral saturated sodium chloride solution electrolysis device constructed based on the electrode can be used for preparing high-purity hydrogen and chlorine.

The invention belongs to the technical field of halide solid-state electrolyte, and relates to a high-conductivity and high-lithium-stability modified halide solid-state electrolyte material constructed by solid source plasma, and a preparation method and application of the high-conductivity and high-lithium-stability modified halide solid-state electrolyte material. According to the preparation method, a halide solid electrolyte is taken as a matrix, halogenated ammonium salt is taken as a solid source, and the halide solid electrolyte is subjected to synergistic doping modification of elements such as nitrogen, fluorine / chlorine / bromine and the like by utilizing a plasma technology, so that the modified halide solid electrolyte material is obtained. The modified halide solid electrolyte material shows excellent conductivity and lithium-lithium symmetrical battery performance, and has a wide market application prospect. Meanwhile, the preparation method provided by the invention is simple, rapid, efficient and convenient, is easy to control, and contributes to promoting the development and application of the high-performance halide solid electrolyte material.

The invention provides a surface-modified sulfide electrolyte and a preparation method thereof, and an all-solid-state battery, the surface-modified sulfide electrolyte comprises a sulfide electrolyte and a modification layer coated on the surface of the sulfide electrolyte, the chemical general formula of the modification layer is LiaMbNcXd, 0 < = a < = 3, 0 < = b < = 1, 0 < = c < = 1, 0 < = d < = 6, and 0 < = c < = 1. M is at least one element of magnesium, aluminum, calcium, iron, zirconium, niobium, tantalum, tungsten, gadolinium, yttrium, indium, hafnium, lanthanum and ytterbium, and X is at least one element of oxygen, sulfur, fluorine, chlorine, bromine and iodine. According to the surface-modified sulfide electrolyte, the modification layer with high ionic conductivity and high oxidation potential is coated outside the sulfide electrolyte, so that when the surface-modified sulfide electrolyte is applied to a positive electrode of an all-solid-state battery, the modification layer can improve the oxidation potential of the electrolyte on the premise of not reducing the ionic conductivity of the electrolyte; the effects of improving the interface stability between the positive electrode active material and the sulfide electrolyte and further improving the cycle performance of the battery are achieved.

The invention relates to the technical field of seawater bromine extraction, in particular to a seawater bromine extraction method which comprises the following steps: an acidification process, an oxidation process, a blowing and sucking process and a distillation and condensation process so as to prepare industrial bromine. Preparing an acid raw material and an alkali raw material by using a bipolar membrane device; acidifying the seawater with an acid raw material to form a first mixed solution; oxidizing the first mixed solution by using chlorine gas to form a second mixed solution, and enabling the second mixed solution to enter a blow-off tower; blowing free bromine in the second mixed solution into the absorption tower through a blow-off tower, and remaining blown solution; reacting the free bromine in the absorption tower to obtain a finished solution; the finished liquid enters a distillation tower and is reduced by chlorine to obtain gaseous bromine simple substance, and the gaseous bromine simple substance is condensed, separated and rectified to obtain industrial bromine. The technical problem of low bromine extraction efficiency in traditional construction is solved, and the efficiency of extracting bromine from low-concentration seawater is improved.

Metal recovery and separation systems and methods, more particularly electrothermal chlorination (ETC) and electrothermal carbochlorination (ETCC) methods and systems for selective metal extraction, such as extraction of key metals from waste streams. Alternatively, other oxidizing agents, such as fluorine, bromine or iodine, may be used in place of or in combination with chlorine. Further, or other reducing agents, such as a metal (0), such as tin (0), and H2 (H2 included in argon, such as 1% to 5% by volume of H2 in argon, may be used in place of or in combination with carbon. Embodiments of the invention may utilize ETC to selectively recover In from ITO-containing waste, and utilize ETC in combination with ETCC to recover Ta from capacitor waste.

The invention relates to a preparation method of a cardanol compound 2. The reaction is as follows: # imgabs0 # R'is selected from H, carboxyl, halogen or halogen substituted C1-4 alkyl, and halogen is selected from fluorine, chlorine, bromine and iodine; comprising the following steps: (1) reacting a compound of formula 1 in the presence of sodium ethanethiol and inorganic base to obtain a compound 2; the preparation method provided by the invention is mild in process condition, simple and convenient to operate, high in yield, simple in post-treatment and suitable for industrial large-scale production.

The utility model discloses a seawater concentration bromine extraction system based on deep waste heat recovery and new energy driving, and belongs to the technical field of salt chemical industry and new energy. On the basis of an existing seawater concentration bromine extraction system, a new energy mode is adopted for process heating, and heat exchange jackets are arranged on the outer walls of a sulfur combustion furnace 1 and a high-temperature SO2 flue 3; low-temperature air is sequentially fed into a heat exchange sleeve 26 and a heat exchange sleeve 20 through an air feeder 21 and exchanges heat with high-temperature and high-corrosion flue gas in a flue and higher-temperature flue gas in a sulfur combustion furnace, then the low-temperature air is fed into a miniature high-temperature waste heat hot water boiler 10, water is fed into a heating furnace, and cooled flue gas is subjected to circulating heat exchange through the air feeder 21. High-temperature water of the miniature high-temperature waste heat hot water boiler 10 is fed into the flash tank 23 and generates flash steam, and after the temperature of outlet water is reduced, the outlet water returns to the flash tank 23 for circulating heat exchange. Flash steam of the flash tank 23 is mixed with steam produced by the high-temperature heat pump steam producing device 37 and the new energy electric heating steam furnace 38, and then the mixture is sent to the liquid chlorine water bath 51 and the like for process heating.

The main object of the present invention is to provide an organic EL display that has excellent light emission characteristics to enable low voltage driving and has light emitting elements with high reliability, thereby serving to realize a desired current density. Provided is a display device including a substrate, a first electrode, a second electrode, a pixel separation layer, and an organic layer containing a light emitting layer, wherein the pixel separation layer contains a colorant (D-DL), has an optical density of 0.5 to 3.0 in the visible light wavelength range per μm of the thickness of the pixel separation layer, and has a plurality of pixel parts in a plan view. The detection intensity of the sulfur ion (S−), the detection intensity of the chlorine ion (Cl−), the detection intensity of the bromine ion (Br−), and the sum of the detection intensity of the chlorine ion (Cl−) and the detection intensity of the bromine ion (Br−), all measured by time-of-flight secondary ion mass spectrometry at a position 3 nm deep in each pixel part from the surface of the first electrode, the surface being in contact with the organic layer containing a light emitting layer, satisfy relationships represented by specific general formulas.

Provided are an electrolyte, a battery, and an energy storage device, for use in solving the problem in existing batteries of poor high-voltage cycling stability and safety of electrolytes. The electrolyte comprises a lithium salt, a solvent, and additives. The additives include a first additive and a second additive. The first additive is one or more of compounds as shown in formula I, and the second additive is one or more of compounds as shown in formula II. R1-R6 are each independently selected from F, a C6-C26 fluoro-substituted phenoxy group, and a C1-C20 fluoro-substituted alkoxy group, R7-R12 are each independently selected from halogen, a C1-C20 fluoro-substituted alkyl group, a cyano group, and an amino group, at least one of R7-R12 is selected from the cyano group, and the halogen includes one or more of fluorine, chlorine, bromine and iodine.

The invention relates to the technical field of flow batteries, in particular to a bromine-chromium flow battery system. According to the invention, one or more of hydrobromic acid, hydrochloric acid and hydroiodic acid are used as additives, and Br2 and the additives in the electrolyte are complexed to form Br2X <-> to exist in the electrolyte, so that battery performance reduction caused by overflow and precipitation of bromine gas in the positive electrolyte is avoided, and the efficiency of the bromine-chromium flow battery is improved; meanwhile, the flow battery system further relieves battery part aging caused by bromine overflow and capacity fading caused by bromine loss through the gas conveying device, so that the service life of the bromine-chromium flow battery is prolonged.

The invention discloses a gold leaching process using a high-safety bromine-containing substance, and belongs to the technical field of gold extraction. According to the method, the dibromo dimethyl hydantoin and the calcium bromide are prepared into the leaching solution according to a certain proportion, efficient gold leaching is achieved by adjusting parameters such as the pH value and the leaching time under the condition of the metal ion catalyst, and the gold can be effectively adsorbed, analyzed and recycled through the leached pregnant solution. Meanwhile, bromine in the leachate is recycled through an electrochemical method, bromine is prevented from permeating into the environment, the dosage of chemicals is reduced, a complete gold leaching and chemical circulating system is constructed, the gold leaching efficiency is improved, the environmental risk is reduced, the technical applicability is expanded, and the defects that traditional liquid bromine gold leaching is large in toxicity, low in leaching rate and leaching efficiency and the like are overcome.

In order to solve the problem that an electrolyte in an existing battery is poor in high-voltage cycling stability and safety, the invention provides an electrolyte, a battery and an energy storage device, the electrolyte comprises a lithium salt, a solvent and an additive, the additive comprises a first additive and a second additive, the first additive is one or more of compounds shown in the formula I, and the second additive is one or more of compounds shown in the formula II; the second additive is one or more of compounds as shown in a formula II; wherein R < 1 > to R < 6 > are respectively and independently selected from F, fluorine-substituted phenoxy of C < 6 > to C < 26 > and fluorine-substituted alkoxy of C < 1 > to C < 20 >, R < 7 > to R < 12 > are respectively and independently selected from halogen, fluorine-substituted alkyl of C < 1 > to C < 20 >, cyano and amino, at least one of R < 7 > to R < 12 > is selected from cyano, and halogen comprises one or more of fluorine, chlorine, bromine and iodine.

The invention relates to the technical field of synthesis of metal organic complexes, in particular to a preparation method of a metal organic complex, and aims to solve the problems that the metal organic complex is tedious to prepare, low in yield, high in cost, incapable of meeting industrial production requirements and the like in the prior art. The preparation method of the metal organic complex comprises the following steps: carrying out Grignard reaction on a Grignard reagent and (dimethylamino) acetone to prepare a first product; wherein the Grignard reagent comprises R-MgX, R is selected from any one of C1-C2 alkyl groups, and X is selected from any one of chlorine, bromine and iodine; the general formula of the first product is as shown in the following formula (I): # imgabs0 # (I); carrying out a complexation reaction on the first product and a salt of a first metal M to prepare a metal organic complex; the general formula of the metal organic complex is as shown in the following formula (II): # imgabs1 # (II); m is selected from any one of copper and nickel.

The invention discloses a PTA wastewater ozone-biochemical coupling deep treatment method for inhibiting bromine oxidation. The method comprises pretreatment, pre-ozone oxidation-biological membrane coupling treatment, secondary coagulating sedimentation, post-ozone-BAC filter coupling treatment and an online monitoring control system. According to the process, ozone oxidation is limited in a direct oxidation stage by controlling the ozone dosage and optimizing the reflux ratio, so that oxidation of bromide ions is reduced to the greatest extent while the biodegradability of the wastewater is improved. The front ozonation unit and the rear ozonation unit both adopt high reflux ratio design, so that the direct contact concentration of ozone and raw water is reduced. The online monitoring control system adjusts the ozone adding amount and the reflux ratio in real time, so that the treatment effect is ensured, and meanwhile, generation of bromate is inhibited. The process can effectively remove refractory organic matters and ammonia nitrogen in the PTA wastewater, meanwhile, the bromate content is controlled at a lower level, and the process has a good treatment effect, economical efficiency and environmental friendliness.

The invention discloses soldering paste added with iodine and capable of reducing voidage and a preparation method of the soldering paste. The soldering paste is prepared from the following raw materials in percentage by mass: 85-90% of lead-free soldering powder; 9%-14% of a soldering flux; 0.1%-2% of an iodine element additive; the soldering flux is composed of the following raw materials in percentage by mass: 35%-45% of rosin; 8%-12% of a thixotropic agent; 8%-10% of an active agent; 2%-4% of an antioxidant; 2%-3% of a corrosion inhibitor; and the balance solvent. By adding the iodine additive with a specific content, the iodine additive can effectively reduce the surface tension of the soldering paste, improve the wetting effect and accelerate the diffusion and escape speed of gas, so that the purpose of reducing voidage is achieved, a special vacuum furnace is not needed, the equipment cost is effectively reduced, and the production efficiency is improved. And meanwhile, the product does not contain bromine or chlorine, so that harmful gas is not generated during welding, and the product is very environment-friendly.

An in situ protective coating is deposited on surfaces of chamber components of a reaction chamber at high temperatures. The in situ protective coating may be deposited at a temperature greater than about 200° C. to provide a high quality coating that is resistant to certain types of halogen chemistries, such as fluorine-based species, chlorine-based species, bromine-based species, or iodine-based species. Subsequent coatings or layers may be deposited on the in situ protective coating having different etch selectivities than the underlying in situ protective coating. The in situ protective coating may be deposited throughout the reaction chamber to deposit on surfaces of the chamber components, including on chamber walls.

A solid electrolyte according to one aspect of the present invention is a solid electrolyte containing lithium, phosphorus, sulfur, aluminum, nitrogen, bromine, and iodine as constituent elements and having a crystal structure, wherein the solid electrolyte satisfies conditions (a), (b), or (c) below when a molar ratio of the lithium to the phosphorus is represented by r1, a molar ratio of a sum of the bromine and the iodine to the phosphorus is represented by r2, and a molar ratio of a sum of the bromine and the iodine to the nitrogen is represented by r3. 3.00≤r1−r2≤3.60and1.5≤r3≤100 2.80≤r1−r2<3.00and2.0≤r3≤100 2.60≤r1−r2<2.80and2.5≤r3≤100

The present invention relates to a growth inhibitor for forming a thin film, a method of forming a thin film using the growth inhibitor, and a semiconductor substrate fabricated by the method. More specifically, the growth inhibitor for forming a thin film of the present invention is a compound represented by Chemical Formula 1: AnBmXoYiZj. In Chemical Formula 1, A is carbon or silicon; B is hydrogen or an alkyl group having 1 to 3 carbon atoms; X includes one or more of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I); Y and Z independently include one or more selected from the group consisting of oxygen, nitrogen, sulfur, and fluorine and are different from each other; n is an integer from 1 to 15; o is an integer greater than or equal to 1; m is 0 to 2n+1; and i and j are integers from 0 to 3.

The invention discloses a high-entropy polyanion halide solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage. The chemical general formula of the high-entropy polyanion halide solid electrolyte is AxMyNzXmOn, A is any one or more of Li, Na, K, Cu and Ag, M is any one or more of Ta, Zr and Nb, N is composed of P, Si, B, C and S, and X is one or more of fluorine, chlorine, bromine and iodine. According to the solid electrolyte, eight polyanion radicals (PO4 < 3->, SiO4 < 4->, CO3 < 2->, BO < 2->, SO4 < 2->, P2O74 <->, ClO4 <-> and B4O74 <->) are introduced into an A-M-Cl frame structure, so that the solid electrolyte can be used for preparing the high-entropy polyanion halide solid electrolyte. The polyanion radicals are connected with the adjacent [MCl] polyhedrons in a cluster form through common edges and common vertexes, so that a chain structure is formed. According to the halide solid electrolyte disclosed by the invention, the torsion resistance of an amorphous structure is increased through a special connection mode, a free space is expanded, and efficient transmission of lithium ions is facilitated. The example conductivity of the halide electrolyte material at room temperature exceeds 20 mS cm <-1 > at most.

The invention discloses a mixed fire extinguishing agent and a testing method thereof, and the mixed fire extinguishing agent comprises 2-bromo-3, 3, 3-trifluoropropene and perfluoro-2-methyl-3-pentanone; the test method comprises the following steps: S100, mixing the 2-bromo-3, 3, 3-trifluoropropene and the perfluoro-2-methyl-3-pentanone according to a preset mass ratio, and adding the 2-bromo-3, 3, 3-trifluoropropene and the perfluoro-2-methyl-3-pentanone into the mixture, s200, controllable flames are generated; s300, a mixture of the 2-bromine-3, 3, 3-trifluoropropene and the perfluoro-2-methyl-3-pentanone is adopted to carry out fire extinguishing on the controllable flame, and a mixture of the 2-bromine-3, 3, 3-trifluoropropene and the perfluoro-2-methyl-3-pentanone is adopted to carry out fire extinguishing on the controllable flame And S400, the minimum fire extinguishing concentration of the mixture is measured. The mixed fire extinguishing agent and the testing method thereof have the advantage that the mixed fire extinguishing agent capable of effectively extinguishing fire and the testing method thereof are provided.

There is provided a method for manufacturing graphene, the method comprising: forming graphene on a non-metallic surface of a substrate by CVD in a CVD reaction chamber, wherein the step of forming graphene comprises introducing a precursor in a gas phase and / or suspended in a gas into the CVD reaction chamber; wherein the precursor consists of one or more compounds selected from a C4-C10 organic compound; wherein the organic compound is branched such that the organic compound has at least three methyl groups; and wherein the organic compound consists of carbon and hydrogen and, optionally, oxygen, fluorine, chlorine and / or bromine.

The invention belongs to the technical field of inorganic matter preparation methods, and particularly provides a method for extracting bromine in brine, which comprises the following steps: S1, acidification and oxidation pretreatment of brine; s2, bromine molecules are blown out through air; s3, absorbing sulfur dioxide and fresh water; s4, distilling and purifying bromine; s3, a method for adjusting the bromine concentration C in the finished liquid in the absorption process of sulfur dioxide and fresh water is included, and S300, a high-pressure atomization nozzle array with the pore diameter being 1.0-2.0 mm is adopted, the distance between nozzles is matched with the sectional area of a blowing and suction tower, and a three-dimensional atomization field is formed; s301, controlling the volume flow ratio of gas to liquid in the absorption tower; s302, the high-pressure atomization nozzle is provided with a high-pressure pump set, and the high-pressure pump set can establish a dynamic pressure compensation model; and S303, monitoring the bromine concentration C in the finished liquid in real time through an online concentration meter, and adjusting the fresh water flow in real time according to the bromine concentration C in the finished liquid so as to control the bromine concentration in the finished liquid.

The present disclosure provides various characteristics for treating tail brine extracted from a bromine plant, when said brine contains residual bromine and chlorine with low pH and high ORP values that will be used in a lithium extraction production facility. The method conditions the extracted tail brine by adding either sodium hydroxide or ammonium hydroxide to bring its pH levels to between 5.5 and 6.5. The conditioned tail brine then gets pre-treated with hydrazine in either less than 70 ppm if used in combination with sodium hydroxide; or 195 ppm if used with ammonium hydroxide until the ORP levels have reached to below 100 mV. The extracted tail brine is then processed through DLE processing device having four groups of adsorption columns filled with lithium adsorption resins that, after treating the extracted tail brine, discharges the raw eluate solution to an effluent tail brine tank using an effluent tail brine pump connected to the DLE processing device.

The invention discloses a high-voltage-resistant brominated flame-retardant polyamide composition and a preparation method thereof, and belongs to the technical field of flame-retardant materials. The composition comprises the following components in percentage by mass: 30-80 wt% of aliphatic polyamide, 10-30 wt% of a brominated flame retardant, 0.5-10 wt% of an antimony-based synergist, 0.5-10 wt% of aromatic zinc carboxylate, 0.5-5 wt% of hydroxyapatite, 0.1-50 wt% of a reinforcing agent and 0-5 wt% of other auxiliaries, the sum of the contents of all the components is 100 wt%, and the raw material components are subjected to melt blending processing through a single-screw or double-screw extruder. The invention provides the high-voltage-resistant brominated flame-retardant polyamide composition, the relative tracking index (CTI) of the high-voltage-resistant brominated flame-retardant polyamide composition is greater than 400V, and the high-voltage-resistant brominated flame-retardant polyamide composition has high-level flame retardance and cost effect.

The utility model discloses a two-stage rectifying tower for bromine extraction, which comprises a base, two groups of fixing frames arranged on the upper end face of the base, a rectifying tower body arranged inside the top ends of the fixing frames, a reflux inlet arranged at the bottom end of the rectifying tower body, a reflux pipe arranged at the bottom end of the reflux inlet, and a delivery pump arranged at one end of the reflux pipe. And a first flow guide pipe is arranged at the output end of the conveying pump. The finished product discharge pipe is arranged at the bottom end of the rectifying tower body, the reflux inlet is formed in the bottom end of the finished product discharge pipe, and the reflux pipe is arranged at the output end of the reflux inlet, so that liquid at the bottom end of the rectifying tower body flows back into the reboiler by the reflux pipe through the first flow guide pipe, and the phenomenon that the liquid flows back into the reboiler during distillation is avoided; and the residual bromine in the cooled liquid is discharged and discarded as a prepared liquid, so that the resource waste is caused.

The invention discloses a method for removing bromine ions in a salt water body. The method comprises the steps of pretreatment before electrolytic oxidation, primary precise directional electrolysis, primary split-pole separated air real-time air stripping, secondary precise directional electrolysis, secondary split-pole separated air real-time air stripping, deep removal of bromine ions Br <-> by a reverse osmosis membrane, separation of bromine carrier airflow containing Br2 and the like. According to the method, the problems of environmental friendliness, economical efficiency, relatively good adaptability, directivity of a bromine ion Br <-> removal standard and how to deeply remove the bromine ion Br <-> in the prior art can be solved, and the Br <-> in the salt water body can be reduced to 10 ppm or below; the unit operation in the process path is basically conventional operation or universal operation, and has a good engineering feasibility foundation and an economic feasibility foundation.

The present invention relates to a coating for the surface of a household item comprising a decoration (a) that comprises a thermochromic pigment compound of formula BiOA1-xBx (I) where: - A and B are selected from the group consisting of iodine, fluorine, chlorine and bromine; A and B are different from one another; and - x is between 0 and 1, the decoration (a) being in the form of a layer that exhibits a reversible variation in its optical and / or colorimetric properties when the coating comprising it is subjected, in whole or in part, to a variation in temperature between a cold temperature and a hot temperature, the cold temperature being between 0°C and 40°C and the hot temperature being between 80°C and 400°C.

The present invention discloses a pyridone azo dye and a preparation method thereof, belonging to the field of fine chemical technology. The general structural formula of the pyridone azo dye is as follows: wherein X1, X2, X3, X4, and X5 are each independently selected from one of nitro, hydrogen, fluorine, chlorine, bromine, cyano, and substituted or unsubstituted phenyl; the R substituent is selected from one of the following structures: By introducing an R substituent at the N position of pyridone, the problem of low solubility of pyridone azo dye in organic solvents can be effectively solved. The solubility of the pyridone azo dye disclosed in the present invention in organic solvents is between 5-9 g / 100 mL, and the molar absorption coefficient of this type of dye is between 20,000-120,000 L·mol ‑1 cm ‑1 It has excellent light and heat stability within the range and is feasible for preparing optical devices and full-color high-stable display materials.

The polycarbonate composition comprises a linear homopolycarbonate and an optional styrene-containing copolymer; a poly (carbonate-siloxane) comprising from about 10 wt% to less than about 30 wt% siloxane present in an amount effective to provide from about 1 to about 6 wt% siloxane based on the total weight of the composition; an ultra-high molecular weight polydimethylsiloxane present in an amount effective to provide from greater than about 0.3 to less than about 0.9 wt% siloxane based on the total weight of the composition; a flame retardant; and optionally, an additive composition. Molded samples of the polycarbonate composition have a UL94 burn test rating or V-0 at a thickness of 1.5 mm, exhibit anti-drip properties, and may be substantially halogen free, i.e., the polycarbonate composition includes about 900 parts per million (ppm) of each of chlorine, bromine, and optionally fluorine, and further includes a total chlorine, bromine, and fluorine content of about 1500 ppm or less.

The invention relates to a waste circuit board resourceful treatment technology, in particular to a method for recovering sodium fluoride, sodium chloride and sodium bromide from smelting flue gas absorption liquid, which comprises the following steps: (1) carrying out primary evaporative crystallization on the absorption liquid, and separating after the bromine content reaches a first target value to obtain sodium fluoride, primary crystallization mother liquor and condensed water, (2) dissolving sodium bromide in the primary crystallization mother liquor for phase equilibrium blending; (3) carrying out secondary evaporative crystallization on the blended liquid, and separating after the bromine content reaches a second target value to obtain sodium chloride, secondary crystallization mother liquor and condensed water; and (4) carrying out tertiary evaporative crystallization on the secondary crystallization mother liquor, and separating to obtain sodium bromide, tertiary crystallization mother liquor and condensed water. According to the method, high-value sodium fluoride, sodium chloride and sodium bromide can be separated and recycled from the waste circuit board smelting flue gas absorption liquid, condensate water is recycled, no waste liquid is discharged, and good economic and environment-friendly benefits are achieved.