1364results about "Electrodialysis" patented technology

Air flows across an air-liquid interface such that liquid desiccant flowing through the interface absorbs water from the air and is thereby diluted to form an output stream. The output stream is circulated through an electrodialytic stack having a central ionic exchange membrane and first and second outer ionic exchange membranes. A redox shuttle loop circulates around the first and second outer ionic exchange membranes. A voltage is applied across the electrodialytic stack, which regenerates the liquid desiccant.

The present disclosure relates to an electrochemical device for extracting copper from copper-containing wastewater and an extraction method using the same. Cu-based chalcogenide, as an electrode material, forms an electrochemical device with other electrodes. The device is an electrocatalytic coupling deionization system with electrochemical oxidative decomplexing performance, and has a good selective removal effect of Cu2+ from organic complex copper-containing wastewater, strongly acidic wastewater, and wastewater interfered by high concentration salt ions and heavy metal ions. With this device, the organic complex pollutant Cu-EDTAn can be effectively decomplexed to complete the extraction of Cu2+.

The utility model discloses an electrodialysis device with an automatic hydraulic station, and belongs to the field of electrodialysis devices. The hydraulic cylinder is connected with the electrodialysis assembly; an oil tank; one end of the pump body is communicated with the oil tank; the inlet end of the one-way valve is communicated with the other end of the pump body, and the outlet end of the one-way valve is communicated with the hydraulic cylinder; one end of the pressure sensor is communicated with the oil tank, and the other end of the pressure sensor is communicated between the outlet end of the one-way valve and the hydraulic cylinder; one end of the electromagnetic valve is communicated with the oil tank, and the other end of the electromagnetic valve is communicated between the outlet end of the one-way valve and the hydraulic cylinder; and the controller is electrically connected with the pressure sensor and the electromagnetic valve. The utility model has the technical effects that the pressure can be automatically controlled conveniently, and the pressure can be prevented from being too large or too small.

Provided is a two-membrane eluent generator and a chromatography detection apparatus. The two-membrane eluent generator includes a stock solution channel; an eluent channel, a first ion-exchange membrane set being arranged between the eluent channel and the stock solution channel, the first ion-exchange membrane set including at least one ion-exchange membrane; a regenerant solution channel, a second ion-exchange membrane set being arranged between the eluent channel and the regenerant solution channel, the second ion-exchange membrane set including one bipolar membrane, wherein hydrogen ions or hydroxide ions generated at the bipolar membrane from electrolysis of a regenerant solution respectively enter different sides of the bipolar membrane, and impurity ions are prevented from entering the eluent channel through the bipolar membrane. The chromatography detection apparatus provided in present disclosure includes the two-membrane eluent generator. The present disclosure applies a bipolar membrane between the regeneration channel and the eluent channel, and is thus capable of supplying corresponding hydrogen ions or hydroxide ions for the eluent channel while preventing impurity ions in the regenerant solution from entering the eluent channel, thereby increasing the purity of the eluent.

The invention relates to the technical field of membrane separation, and discloses a double-side-chain anion exchange membrane as well as a preparation method and application thereof. The anion exchange membrane comprises a plurality of polyphenyl ether molecular chains, the polyphenyl ether molecular chain has a structure as shown in a formula I; # imgabs0 # Q1, Q2, Q3 and Q4 are each independently a group represented by formula II, a group represented by formula III, Br or H; at least two of Q1, Q2, Q3 and Q4 are a group as shown in a formula II and a group as shown in a formula III; at least two polyphenyl ether molecular chains of # imgabs 1 # are connected through a structure Ar from a cross-linking agent; according to the double-side-chain anion exchange membrane, two long-chain hydrophobic alkyl side chains are introduced into a polyphenyl ether molecular chain, so that the content of an active ion exchange matrix in the anion exchange membrane is remarkably increased, and the performance of the anion exchange membrane is improved.

This lithium recovery device 10C is provided with a processing tank 1 that is partitioned into a supply tank 11 and a recovery tank 13 by a lithium ion-conducting electrolyte membrane 2. In order to selectively move Li+ to an aqueous solution RS in the recovery tank 13 from an aqueous solution SW in the supply tank 11, the aqueous solution SW containing Li+ and other metal ions Mn+, this lithium recovery device 10C is also provided with: a first power supply 51 which is connected between a first electrode 31 that has a porous structure and is arranged so as to be in contact with a supply tank 11-side surface of the electrolyte membrane 2 and a second electrode 32A that is arranged within the recovery tank 13, in such a manner that the first electrode 31 functions as the positive electrode; and a sub power supply 53 which is connected in series to the positive electrode of the first power supply 51, while having the positive electrode thereof connected to a sub electrode 41 that is arranged within the supply tank 11 at a distance from the electrolyte membrane 2.

The invention provides an alkali metal group ion selective permeable membrane, a preparation method and a lithium, rubidium and cesium extraction method and system, and the membrane is prepared by taking polyphenylene sulfide, Zr (HPO4) 2 and a high-molecular polymer adhesive as raw materials through mixing, fibration treatment and compression molding processes. Based on the weak dipole adsorption characteristic between the sulfur position of high-crystallization polyphenylene sulfide and alkali metal cations, efficient screening of monovalent alkali metal ions (Li < + >, Rb < + > and Cs < + >) and multivalent impurity ions (Mg < 2 + >, Al < 3 + > and Fe < 2 + >) is achieved, and the method can be used for extracting rubidium and cesium. The ion selective permeable membrane has excellent mechanical properties, high separation efficiency and corrosion resistance, and is low in production cost; and finally, the multiple targets of lepidolite leaching liquid impurity removal and lithium rubidium cesium synergistic extraction are achieved.

The application discloses a bipolar membrane electrodialysis device, which comprises an outer box body and further comprises a liquid inlet mechanism, a plurality of electrodialysis mechanisms and a plurality of filtering mechanisms. The filtering mechanism comprises a filtering box, a driving filtering assembly and a liquid feeding assembly. The driving filtering assembly comprises a motor installed on the top of the filtering box, the output shaft of the motor is fixedly connected with a threaded rod, the outer periphery of the threaded rod is threadedly connected with a filtering plate slidingly connected to the inner wall of the filtering box, and the bottom inner wall of the filtering box is fixedly connected with a plurality of plug rods matched with filtering holes of the filtering plate. Raw water is delivered to the inside of the filtering box through the liquid inlet mechanism, is actively filtered without turbulence through the driving filtering assembly, is delivered to the corresponding electrodialysis mechanism through the liquid feeding assembly and is further subjected to electrodialysis treatment. The filtering plate and other components are arranged to filter out the solid impurities mixed in industrial glucose acid salt, so that the bipolar membrane electrodialysis process and the bipolar membrane body are not affected.

The invention relates to a method for simultaneously preparing lithium hydroxide and sulfuric acid. The invention provides a method for simultaneously preparing lithium hydroxide and sulfuric acid, which comprises the following steps: preparing a bipolar membrane electrodialysis device which comprises a first bipolar membrane, an anion exchange membrane, a cation exchange membrane and a second bipolar membrane, and forming an acid chamber between the first bipolar membrane and the anion exchange membrane, a salt chamber is formed between the anion exchange membrane and the cation exchange membrane, and an alkali chamber is formed between the cation exchange membrane and the second bipolar membrane; a lithium sulfate aqueous solution is added into a salt chamber of the bipolar membrane electrodialysis device, a sulfuric acid aqueous solution is added into an acid chamber, and a lithium hydroxide aqueous solution is added into an alkali chamber; and discharging the desalted solution formed in the salt chamber of the bipolar membrane electrodialysis device, discharging the sulfuric acid aqueous solution formed in the acid chamber, and discharging the lithium hydroxide aqueous solution formed in the alkali chamber.

The invention relates to a method for removing thermally stable salt by electrodialysis, which comprises the following steps: i) providing an electrochemical reaction membrane stack which comprises a cathode plate, an anode plate and at least one repeatable unit arranged between the two polar plates, an electric field exists between the cathode plate and the anode plate, each repeatable unit comprises a pure water channel, a desalination channel and an alkali liquor channel in the direction from the cathode plate to the anode plate, the pure water channel is limited by an anion exchange membrane and a cation exchange membrane, the desalination channel is limited by the cation exchange membrane and the anion exchange membrane, and the alkali liquor channel is limited by the anion exchange membrane and the anion exchange membrane; ii) introducing pure water into the pure water channel, introducing raw water into the desalination channel, introducing alkali liquor into the alkali liquor channel, and iii) withdrawing a product stream from the desalination channel; wherein the raw water contains an organic amine compound and a heat-stable salt. The method provided by the invention realizes removal of thermally stable salts by using an electrochemical reaction membrane stack.

The present invention relates to a system for capturing carbon dioxide from an air stream. The system includes a carbon dioxide capturing unit that includes a humidity / temperature adjusting unit with an evaporative cooling unit and a CO2 adsorbing unit. The CO2 adsorbing unit includes a sorbent column made of polyamine-Cu (II) complex resin. The humidity / temperature adjusting unit receives air stream from ambient atmosphere and process the air stream to obtain a humidity-adjusted air stream. The CO2 adsorbing unit receives the humidity-adjusted air stream to pass through the sorbent column. The sorbent column selectively adsorbs the CO2 from the humidity-adjusted air stream. The sorbent column is regenerated using an alkaline stream to separate the adsorbed CO2 from the sorbent column.

The invention relates to an electrodialysis device for the desalination of water for oil and gas applications comprising: a membrane stack comprising alternating cation- and anion-exchange membranes (2.1, 2.3) and a plurality of spacers (2.2, 2.4), each spacer being arranged between two successive membranes; wherein at least one of the spacers (2.2, 2.4) comprises a recessed area (3.2) and a non-recessed area (3.3), a central opening (3.1) within the recessed area (3.2); the spacer (2.2, 2.4) is provided with at least four orifices (3.4, 3.5) within the non-recessed area (3.3); and with respective channels (3.6) which connect at least two of the orifices (3.4) with the central opening (3.1); and one membrane (2.1, 2.3) is accommodated in the recessed area (3.2).The invention also relates to a water desalination process using the electrodialysis device mentioned above.

The invention relates to a method for extracting lithium from a salt lake and synchronously removing silicon and boron. The method comprises the following steps: pre-treating and filtering lithium-containing brine; carrying out reverse osmosis concentration treatment to concentrate lithium to be more than 2.5 g / L; carrying out nanofiltration treatment to remove magnesium, calcium and sulfate ions; treating by adopting an electrodialysis system to obtain a high-silicon and high-boron desalted solution and a low-silicon and low-boron lithium concentrated solution; the low-silicon and low-boron lithium concentrated solution is treated with chelating resin and boron removal resin, so that magnesium and calcium ions are smaller than or equal to 2 mg / L, boron is smaller than or equal to 20 mg / L, and the refined lithium concentrated solution is obtained; concentrating by an evaporation system, adding a precipitant, precipitating, filtering, washing, crushing and demagnetizing to obtain a low-silicon low-boron battery-grade lithium carbonate product. The invention further discloses a system for extracting lithium from the salt lake and synchronously removing silicon and boron, the complex and low-efficiency boron removal and silicon removal nanofiltration process is adopted, and concentration of lithium and efficient removal of silicon and boron are synchronously achieved; silicon scaling pollution caused by membrane separation and heat exchanger tube nests is avoided, and deep removal of silicon and boron is realized.

The invention discloses a method for converting lithium hydroxide into lithium carbonate. The method comprises the following steps: S1, preparing or taking a lithium hydroxide solution and a carbonate solution; s2, putting the lithium hydroxide solution and the carbonate solution into electrodialysis equipment, and carrying out electrodialysis treatment; and S3, after electrodialysis is finished, collecting a lithium carbonate solution, and sequentially carrying out lithium precipitation and solid-liquid separation on the lithium carbonate solution to obtain the battery-grade lithium carbonate. According to the method for converting lithium hydroxide into lithium carbonate disclosed by the invention, CO2 is replaced by carbonate, so that the generation of lithium bicarbonate is avoided, the lithium carbonate and the byproduct alkali liquor are directly obtained, the raw material source is wide, the preparation condition is mild, the production cost is greatly reduced, and the method has huge potential economic benefits.

The present invention relates to a monovalent selective cation exchange membrane and a preparation method thereof, belonging to the technical field of cation exchange membranes. The specific steps are: weighing DA and ammonium persulfate and adding them to a buffer solution to obtain a PDA coating solution, pouring the PDA coating solution on the surface of a base membrane for soaking, depositing a PDA coating on the surface of the activated base membrane to obtain membrane I; dissolving zirconium tetrachloride and 2-aminoterephthalic acid in DMF, then solvent-thermally synthesizing an amino-functionalized MOF (UIO-66-NH2) under acidic conditions, weighing PEI and MOF (UIO-66-NH2) powders and adding them to a buffer solution, then pouring them on the surface of membrane I, depositing a PEI-MOF composite coating to obtain membrane II, and air-drying membrane II to obtain a monovalent selective cation exchange membrane. It can be seen that the present invention can prepare a low-cost, highly selective, and stable-performance monovalent selective cation exchange membrane by modifying the cation exchange membrane through a simple and easy-to-operate method.

The invention belongs to the technical field of impurity separation, and particularly discloses a method for separating and purifying impurities in a process for preparing glyoxylic acid through oxalic acid electrolysis, a crystallization kettle is included, an isolation device is arranged in the crystallization kettle, and the isolation device comprises a conical top cover, a conveying pipe, an annular filter screen, a directional conveying assembly and a sealing assembly; the conical top cover is arranged at the axis of the crystallization kettle, an opening of the conical top cover faces downwards, and a plurality of fixing rods are fixedly connected between the top of the conical top cover and the inner wall of the side face of the crystallization kettle. According to the method, glyoxylic acid product solutions with different concentration specifications and the high-purity glyoxylic acid crystal can be obtained after the electrolyte is sequentially subjected to pre-evaporation, electrodialysis, secondary evaporation, cooling crystallization, solid-liquid separation, washing and drying and other procedures, so that the prepared high-purity glyoxylic acid crystal can be popularized and applied in the field of high-end medicine.

A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.

The invention relates to a method for separating and purifying a liquid system, the liquid system comprises an ionic liquid with the concentration ranging from 0.05 mol / L to 6.0 mol / L and a metal salt with the concentration ratio of the ionic liquid to the metal salt ranging from 2: 1 to 1: 2, and the method comprises the following steps: carrying out first-stage electrodialysis on the liquid system at the first current density ranging from 0.1 mA / cm < 2 > to 50 mA / cm < 2 >, and carrying out second-stage electrodialysis on the liquid system at the second current density ranging from 0.1 mA / cm < 2 > to 50 mA / cm < 2 >; an ionic liquid primary product and a metal salt primary product are obtained; evaporating the ionic liquid primary product and the metal salt primary product to obtain an ionic liquid concentrated solution and a metal salt concentrated solution; and performing second-stage electrodialysis on the ionic liquid concentrated solution and the metal salt concentrated solution at a second current density of 0.1-50mA / cm < 2 > to obtain an ionic liquid product and a metal salt product. According to the method disclosed by the invention, all process links are properly joined and organically coupled, and the method is operated at normal temperature and normal pressure, has relatively high production efficiency, is easy for large-scale development, is an additive-free, basically secondary-waste-free and green method, and has industrial application value.

An electrochemical apparatus comprising: an anode; a bipolar membrane; an anion exchange membrane; a cation exchange membrane; and a cathode; wherein: the anode at least partially defines a first fluid flow path; the anode and / or the first fluid flow path is in contact with the anion exchange membrane of the bipolar membrane; a second fluid flow path is defined between the cation exchange membrane of the bipolar membrane and the anion exchange membrane; a third fluid flow path is defined between the anion exchange membrane and the cation exchange membrane; the cathode at least partially defines a fourth fluid flow path; and the cation exchange membrane is in contact with the cathode and / or the fourth fluid flow path.

Provided is a method of recovering valuable materials that is a method of recovering lithium carbonate from a lithium-ion secondary battery, where the lithium carbonate has a boron content of less than 1 ppm and a calcium content of 100 ppm or less. The method includes a heat treatment step, a crushing and classification step, a slurry formation step, a wet magnetic separation step, an acid leaching step, a neutralization step, a neutralized cake solid-liquid separation step, a calcium carbonate crystallization step, a calcium carbonate solid-liquid separation step, and a calcium adsorption and removal step.

Systems and methods for a catalyzed asymmetric bipolar membrane are described. The catalyzed asymmetric bipolar membrane can maintain a desired current density over a long period of time at a low operating voltage. The catalyzed asymmetric bipolar membrane can be implemented in an electrodialysis cell for various applications such as carbon capture.

The invention provides a COF (at) POC composite film and a preparation method and application thereof. The preparation method comprises the following steps: a) dissolving a COF aldehyde monomer and a POC aldehyde monomer in an organic solvent to obtain a first solution; meanwhile, dissolving a COF amine monomer and a POC amine monomer in an organic solvent to obtain a second solution; b) mixing the first solution, the second solution and an acetic acid solution to obtain a homogeneous membrane casting solution; and c) dispensing the homogeneous casting membrane liquid, and reacting to obtain the COF (at) POC composite membrane. Compared with the prior art, the preparation method provided by the invention has the advantages that specific raw materials are matched with specific process steps and conditions, the overall better interaction is realized, and the prepared COF-POC composite membrane is good in mechanical strength and has high ion flux and excellent ion selectivity for monovalent and divalent ion separation; the method has a wide application prospect in the fields of seawater desalination, salt lake lithium extraction, drug separation and the like.

The invention discloses a preparation and application method of a modified ion exchange membrane for electrodialysis, aiming at the problems of poor selectivity, low mechanical strength, high energy consumption and the like of the existing ion exchange membrane, the high-performance modified membrane is prepared by a base membrane pretreatment-functional grafting-gradient curing synergistic process. The preparation method specifically comprises the following steps: performing ultrasonic cleaning and acid-base activation on a polyethersulfone or sulfonated polystyrene-based membrane, soaking the polyethersulfone or sulfonated polystyrene-based membrane in a modification solution containing an amino / carboxyl / sulfo functional monomer, a cross-linking agent and an initiator, and performing gradient heating curing to form a stable cross-linked network; the grafting rate of the modified membrane is 15-35%, the ion exchange capacity is 1.8-2.5 mmol / g, the water content is 25-40%, and the membrane surface resistance is less than 3 omega.cm < 2 >. When the membrane is applied to an electrodialysis device, the membrane runs under the conditions of 10-30V direct-current voltage, 5-15cm / s flow velocity and 25-45 DEG C, the high-salinity wastewater desalination rate is greater than or equal to 95%, and the monovalent ion selectivity coefficient reaches 5.8-7.2; when the catalyst is used for acid-base recovery, the H < + > migration number is 0.92-0.96, and the energy consumption is reduced by 18-25%.

A lithium recovery device includes a processing tank partitioned into an acid recovery chamber, a lithium supply chamber, an alkali recovery chamber, a lithium recovery chamber in this order, the lithium recovery chamber and the alkali recovery chamber separated by a lithium ion-conductive electrolyte membrane, the acid recovery chamber, the lithium supply chamber, and the alkali recovery chamber separated by ion exchange membranes, and includes power supplies between electrodes provided in each of the alkali recovery chamber and the lithium recovery chamber, and between the electrodes provided in each of the acid recovery chamber and the alkali recovery chamber respectively, with their lithium recovery chamber sides set negative, in order to migrate Li+ selectively from an aqueous solution in the lithium supply chamber containing Li+, other metal ions, and anions such as SO42− to an aqueous solution in the lithium recovery chamber.

The invention discloses a method for separating lithium and boron in a solution with a high boron-lithium ratio. The separation method comprises the following steps: carrying out primary homogeneous electrodialysis concentration separation on a solution with a high boron-lithium ratio under an alkaline condition to prepare primary lithium-rich concentrated water; diluting the first-stage lithium-rich concentrated water to prepare first-stage diluted lithium-rich concentrated water; performing high-pressure RO concentration on the primary diluted lithium-rich concentrated water under an acidic condition to prepare lithium-rich RO concentrated water; performing first-stage homogeneous phase electrodialysis concentration separation on the lithium-rich RO concentrated water under an acidic condition to prepare first-stage lithium-rich concentrated water; carrying out adsorption boron removal and desorption treatment on the first-stage lithium-rich concentrated water by adopting boron removal adsorption resin under an alkaline condition to prepare mixed lithium-rich concentrated water and boron-containing desorption liquid; carrying out MVR (mechanical vapor recompression) evaporation on the mixed lithium-rich concentrated water for preparing battery-grade lithium carbonate; and mixing the secondary boron-rich fresh water with the boron-containing desorption solution, and carrying out MVR evaporation to obtain a boric acid product. According to the method, a reasonable boron removal process combination is adopted, and boron in the solution with the high boron-lithium ratio is removed.

The invention discloses a method for determining operating parameters of an electrodialysis device, which belongs to the technical field of electrodialysis, and comprises the following steps: calculating the resistance of an ion exchange membrane, and if the resistance of the ion exchange membrane is smaller than the resistance of the ion exchange membrane in the specification of an ion exchange membrane product, carrying out subsequent steps; in the first mode, the required operation time is estimated according to the concentration of the solution to be treated, the set flow rate, the volume of the solution to be treated and the selected operation voltage, and the volume of the solution to be treated is estimated according to the concentration of the solution to be treated, the set operation time and the selected operation voltage. In the second mode, the required operation time is estimated according to the concentration of the to-be-treated solution, the set flow rate, the volume of the to-be-treated solution and the selected operation current, and the volume of the to-be-treated solution is estimated according to the concentration of the to-be-treated solution, the set operation time and the selected operation current. Therefore, the problems that an existing electrodialysis mass transfer model is too complex and operation parameters of an electrodialysis device cannot be rapidly determined are solved.

The utility model discloses a membrane stack with a self-cleaning device and electrodialysis equipment, and belongs to the field of electrodialysis equipment, and the membrane stack with the self-cleaning device comprises a membrane stack body, the positive water distribution plate and the negative water distribution plate are respectively propped against two sides of the membrane stack body; the spraying assembly comprises a grating plate, a water supply unit and a plurality of nozzles, the nozzles are connected to the periphery of the grating plate and all communicated with the water supply unit, the grating plate is located in the membrane stack body, and the water supply unit and the nozzles are all located outside the membrane stack body. The utility model has the technical effects that not only is the cleaning comprehensiveness good, but also the occupied space of the nozzle supporting part is small.

An anion exchange membrane obtainable by curing a curable composition comprising: (a) a monomer of formula (I) (a) AR1-(CH2) n-N + (RaRb)-(CH2) n-AR2 wherein: each n independently has a value of 1 or 2; (i) Ra and Rb are each independently an optionally substituted C1-3 alkyl group or an optionally substituted C2-3 alkenyl group; or (ii) Ra and Rb together with the positively charged nitrogen atom to which they are attached form an optionally substituted 5 or 6 membered ring; or (iii) one of Ra and Rb is an optionally substituted C1-3 alkyl group or an optionally substituted C2-3 alkenyl group, and the other of Ra and Rb together with a group of formula AR1-(CH2) n-N + forms an optionally substituted 5 or 6 membered ring; or (iv) Ra together with a group of formula AR1-(CH2) n-N + forms an optionally substituted 5 or 6 membered ring, and Rb together with a group of formula N +-(CH2) n-AR2 forms an optionally substituted 5 or 6 membered ring; x-is an anion; and AR1 and AR2 each independently comprise an aromatic group; wherein: (I) at least one of AR1 and AR2 comprises a curable ethylenically unsaturated group; (II) the monomer (a) of formula (I) comprises at least two curable ethylenically unsaturated groups; and (III) the anion exchange membrane has an ion exchange capacity (IEC) of less than 1.65 meq / g dry membrane.

The invention discloses an organic amine absorption liquid treatment method and device, and the method is as follows: organic amine absorption liquid enters an ion exchange tower or an electrodialysis device after impurities are removed from the organic amine absorption liquid through a pretreatment unit, and the organic amine absorption liquid entering the ion exchange tower and anion exchange resin are subjected to a replacement effect; returning to the desulfurization and decarburization device after the absorption liquid component is recovered, and enabling the water washing liquid to enter an amine deep recovery unit; anions and cations in the organic amine absorption liquid entering the electrodialysis device are removed, a neutral organic amine molecular solution serves as an absorption liquid component and returns to the desulfurization and decarbonization device, and an anion and cation solution carrying organic amine enters an amine deep recovery unit; the amine deep recovery unit is used for separating water vapor and organic amine through a distillation effect; and the separated water vapor and organic amine enter the bottom of a regeneration tower of the desulfurization and decarbonization device. By using the method disclosed by the invention, the hazardous waste treatment capacity can be greatly reduced, so that the loss of organic amine of a desulfurization and decarbonization device is lower than 2wt%; compared with a traditional mode, steam consumption can be saved by about 20%.

The invention discloses a phosphoric acid production process which comprises the following steps: S1, mixing phosphoric acid and phosphorite in a reactor for reaction, and filtering and washing reaction liquid to obtain monocalcium phosphate filtrate; s2, the monocalcium phosphate filtrate enters a bipolar membrane electrodialyzer, the bipolar membrane electrodialyzer is formed by sequentially arranging a cation exchange membrane, an anion exchange membrane and a bipolar membrane, and an acid chamber, a salt chamber and an alkali chamber are formed respectively; the monocalcium phosphate is converted into phosphoric acid and calcium hydroxide under the action of the electrodialyzer. According to the method, phosphoric acid with relatively high purity can be directly prepared, and phosphogypsum is not generated. Compared with the traditional wet-process phosphoric acid, the produced solid waste amount is sharply reduced and is about one tenth to one twentieth of that of the traditional wet-process phosphoric acid, and the phosphoric acid is rich in silicon, magnesium, iron and the like and can be used as a fertilizer additive.