242results about "Hydrogen fluoride" patented technology

In one embodiment, an anhydrous hydrogen fluoride generator vessel (also referred to herein as the “AHF generator vessel”) is provided. In several embodiments, an AHF generator vessel may include a container assembly, one or more shelves, and a center pipe assembly. The container assembly may include a lid assembly that may be removably coupled to the wall, and one or more feet. The center pipe assembly may include a base adapter, a center pipe, and a bottom adapter. In one embodiment, sodium bifluoride is loaded onto the one or more shelves which are positioned perpendicular to the center pipe and stacked upon one another. An external heat source may provide the heat to the vessel to thermally degrade the sodium bifluoride into HF and sodium fluoride (NaF). In various embodiments, the HF may be carried by a carrier gas out of the AHF generator vessel via the lid assembly.

The invention discloses a purification device for producing electronic-grade hydrofluoric acid, which relates to the technical field of hydrofluoric acid production, and comprises a rectifying tower body, tower plates movably connected in the rectifying tower body at equal intervals, overflow weirs fixedly connected on the tower plates, a rotating speed convenient regulation and control mechanism and a state monitoring feedback mechanism, the follow-up rod and the tower plates installed on the outer surface of the follow-up rod can be driven to synchronously rotate in the rectifying tower body, so that the gas-liquid contact area is increased, the gas-liquid contact time is prolonged, the mass transfer process between gas and liquid phases is promoted, in the rectifying process, the separation efficiency and purity can be improved, impurities in raw materials can be removed more easily, and the product quality is improved. And the rotation of the tower plate can enhance the mixing of the liquid on the tower plate, so that the liquid is more uniformly distributed on the tower plate, the residence time and dead zone of the liquid on the tower plate are favorably reduced, and the separation efficiency is further improved.

The invention discloses a method for recovering mixed acid waste liquid containing hydrofluoric acid, which comprises the following steps: reacting raw materials with sodium salt or potassium salt, and filtering to obtain filtrate; the raw material is mixed acid waste liquid containing hydrofluoric acid; feeding the filtrate into a diffusion dialysis device for treatment, wherein the diffusion dialysis device comprises a homogeneous anion exchange membrane; the recovery liquid obtained through treatment of the diffusion dialysis device is fed into a membrane separation device, the membrane material of the membrane separation device is an acid-resistant metal ion removal membrane, and the recovered mixed acid is obtained on the permeation side of the membrane separation device. According to the method, impurities and metal ions in the low-concentration waste acid solution can be effectively removed, the product reaches the electronic-grade recycling standard, the resource recycling rate is increased, the technological process is simple, energy consumption is low, and the method is suitable for industrial application and popularization.

The invention discloses a method for purifying and recycling hydrofluoric acid waste liquid in the electronic industry, which comprises the following steps: rectifying the hydrofluoric acid waste liquid to remove moisture, performing membrane separation treatment on the material liquid to remove most of metal ions in the material liquid, and performing adsorption treatment on the material liquid to remove a small amount of metal ions in the material liquid. And finally, carrying out membrane separation treatment to remove trace metal ions and particulate impurities in the feed liquid. Through a specific combined process, impurities and metal ions in the hydrofluoric acid waste liquid in the electronic industry are effectively removed, the product reaches the electronic-grade recycling standard, and the resource recycling rate is increased.

The invention provides an electronic-grade hydrofluoric acid rectification heat exchange device, and relates to the field of heat exchange devices.The electronic-grade hydrofluoric acid rectification heat exchange device comprises a cold recovery box, the surface of the cold recovery box is provided with a hot backflow pipe and a hot circulation box, a plurality of mass transfer boxes are arranged above the cold recovery box, a plurality of mass transfer bottles are fixedly connected to the interiors of the mass transfer boxes, and the tops of the mass transfer boxes are fixedly connected with a top plate; a plurality of adjusting holes are uniformly formed in the surface of the top plate, adjusting boxes are arranged in the mass transfer boxes, high-corrosion-resistance air bags are symmetrically arranged on the surfaces of the adjusting boxes, adjusting blocks are arranged in the adjusting boxes, rotating pipes are arranged in the mass transfer bottles, and stirring paddles are arranged on the surfaces of the rotating pipes. The efficiency and the stability of the hydrofluoric acid rectification heat exchange device are improved, the adaptability of the device to the production scale and different raw materials is improved, and the energy consumption is reduced.

The invention relates to a method for recovering hydrogen fluoride gas, which is used for recovering hydrogen fluoride gas in NF3 produced by an electrolytic method, and the method comprises the following steps: mixed gas discharged from a cathode of an electrolytic bath flows into a gas buffer tank; ammonium hydrogen fluoride in the mixed gas is condensed in the gas buffer tank, the residual hydrogen and hydrogen fluoride flow into the micro-channel unit, the hydrogen fluoride is condensed in the micro-channel unit, the condensed hydrogen fluoride flows back to the gas buffer tank, and the uncondensed hydrogen fluoride and hydrogen flow into the falling film absorption unit; the hydrogen fluoride is absorbed by an absorber in the falling film absorption unit, the hydrogen fluoride is recovered as a hydrofluoric acid solution, and the residual hydrogen and the residual hydrogen fluoride flow into a three-waste treatment pond; and residual hydrogen fluoride in the three-waste treatment tank is completely absorbed. According to the invention, the single-tube parallel micro-channel condenser is adopted as a condensation unit, and the tube diameter is as small as 10-1000 microns, so that the heat exchange area is greatly increased, the hydrogen fluoride gas can be more effectively condensed and recovered, and the recovery efficiency is remarkably improved.

The invention relates to a phosphorite wet processing method, and belongs to the technical field of chemical engineering. The phosphorite wet processing method comprises the following steps: A, phosphorite acid leaching: carrying out acidolysis leaching on a phosphorite raw material, and carrying out solid-liquid separation to obtain wet-process phosphoric acid; b, removing metal ions from wet-process phosphoric acid; and C, wet-process phosphoric acid defluorination: extracting fluosilicic acid in wet-process phosphoric acid at 10-70 DEG C by adopting a wet-process phosphoric acid defluorination extraction agent, and carrying out phase splitting to obtain defluorinated purified phosphoric acid and an organic phase loaded with fluosilicate. According to the invention, high-value utilization of low-grade phosphorite resources is realized. According to the method, impurities can be fully removed, the loss rate of phosphoric acid is low, the purity of the finally obtained phosphate product reaches 97% or above, the product quality is high, and the requirements of different fields for high-quality phosphate can be met. The method is simple in process, low in energy consumption and low in cost.

The invention discloses a method for recovering valuable metals and fluorine from waste ternary lithium battery black powder. The method comprises the following steps: sulfating roasting: mixing the waste ternary lithium battery black powder with sulfuric acid, curing, and roasting the black powder; the roasted product is subjected to water leaching, and fluorine in water leaching liquid is complexed through boric acid; acidizing and evaporating the water immersion liquid, and collecting hydrofluoric acid; cooling and crystallizing the evaporation mother liquor and collecting boric acid; boric acid is recycled from crystallization mother liquor; precipitating lithium phosphate in the boron extraction raffinate; carrying out acid leaching on the water leaching residues to recover other valuable metals; and anions are extracted from the pickle liquor to realize element circulation. According to the method, through internal circulation of fluorine, boron, sulfur and other elements in the system, resource recycling of fluorine and high-selectivity and high-recovery-rate separation of lithium and other valuable metals can be achieved, and the method has the remarkable advantages of being high in valuable element recycling efficiency, small in environmental pollution and the like and is suitable for complex ion system application scenes.

The invention provides a device for producing anhydrous hydrogen fluoride, which comprises a coarse cooler communicated with a gas outlet of a desulfurizer, a gas outlet of the coarse cooler is communicated with a gas inlet of a primary condenser, and a liquid outlet of the coarse cooler is communicated with a coarse distillation tower; the coarse coolers comprise the first coarse cooler and the second coarse cooler, and the first coarse cooler and the second coarse cooler are connected in series. The anhydrous hydrogen fluoride production device has the beneficial effects that the crude hydrogen fluoride gas is primarily cooled in the production process, so that the content of high-boiling-point substances in crude hydrogen fluoride condensed liquid is reduced, the operation cycle of an anhydrous hydrogen fluoride device production system is prolonged, and the quality of the product anhydrous hydrogen fluoride in a rectification system is improved.

The invention discloses a method and a system for recovering solid residues in titanium dioxide production by a fluorination method. The recovery method comprises the following steps: mixing and reacting solid residues obtained after titanium dioxide is produced by a fluorination method with concentrated sulfuric acid with the concentration of 95-100wt% at the temperature of 25 DEG C or above, so as to obtain ferric sulfate and hydrogen fluoride. According to the method for recycling the solid residues in the titanium dioxide produced through the fluorination method, FeF3 in the solid residues can be converted into Fe2 (SO4) 3 and HF to be recycled, waste is turned into wealth, H2SO4 used in the recycling method is wide in source, the requirement for technological conditions is low, pollution to the environment is small, and the method is suitable for industrial production. And clean production can be realized while the process energy consumption is reduced.

The present invention relates to the technical field of waste resource utilization, and in particular to a method for recycling perfluorocarbon waste. Perfluorocarbon waste is pre-treated, and then mixed with auxiliary materials at a mass ratio of 1:1-5 for perfluorocarbon waste: auxiliary materials to obtain a solid material to be treated; the solid material to be treated is mixed with cement raw material, and sintered at 1400-1500°C to obtain a clinker as a cement raw material; wherein the physical form of the perfluorocarbon waste is liquid or solid; and the auxiliary materials are selected from at least one of coal powder, quicklime powder, charcoal powder, slaked lime powder and cement clinker powder. The recycling method of the present invention can convert perfluorocarbon waste into primary minerals such as calcium fluoride as components in clinker, with low recycling cost and high efficiency.

The invention belongs to the field of inorganic chemical industry, and particularly relates to a method and a system for efficiently utilizing a phosphate fertilizer byproduct, the method comprises the following steps: carrying out acidolysis on fluosilicic acid with the concentration of more than or equal to 45% wt and concentrated sulfuric acid to generate a mixed solution of silicon tetrafluoride gas and fluorosulfonic acid; the mass ratio of the fluosilicic acid to the concentrated sulfuric acid is controlled to be 1: (4-15); pyrolyzing the obtained fluorosulfonic acid to generate dilute sulphuric acid, hydrogen fluoride and water vapor, forming 98% concentrated sulphuric acid from part of dilute sulphuric acid and fuming sulphuric acid, drying hydrogen fluoride to obtain crude hydrogen fluoride gas, and condensing and rectifying to obtain anhydrous hydrogen fluoride; the rest dilute sulphuric acid is partially compounded and then returned for acidolysis, and the rest dilute sulphuric acid is used for producing white carbon black and flows back to a wet-process phosphoric acid system; and circularly absorbing the obtained silicon tetrafluoride gas by using secondary concentrated fluosilicic acid to obtain fluosilicic acid with the mass concentration of more than or equal to 45%, recycling the fluosilicic acid for acidolysis reaction, and modifying the concentrated by-product silicon dioxide to obtain the high-activity white carbon black. The problems of energy consumption and cost are solved, and efficient circulation and poly-generation of fluorine and silicon resources are achieved in the whole process.

Disclosed in the present application is a hydrofluoric acid regeneration method for photovoltaic waste acid. The method comprises the following steps: S1, light component removal, involving: introducing a liquid containing hydrofluoric acid to be treated into a light component removal tower, wherein the tower bottom temperature of the light component removal tower is 100-105°C, and the tower top temperature is 70-80°C, subjecting the liquid to be treated to a light component removal treatment by means of the light component removal tower, discharging the water vapor, which is generated by means of light component removal, via the tower top of the light component removal tower, discharging the generated light component removal liquid, which is generated by means of light component removal, via the tower bottom of the light component removal tower, and introducing same into a first rectification tower; and S2, rectification, involving: the tower bottom temperature of the first rectification tower being 110-115°C, and the tower top temperature being 98-105°C, rectifying the generated light component removal liquid by means of the first rectification tower, discharging HF and water vapor, which are generated by means of rectification, via the tower top of the first rectification tower, condensing same to form hydrofluoric acid, and discharging the distillate, which is generated by means of rectification, via the tower bottom of the first rectification tower. By means of the present application, hydrofluoric acid in the hydrofluoric acid waste liquid can be recycled, and compared with the prior art, the situation where fluorine resources are wasted is effectively avoided.

The invention relates to the technical field of fluorine-containing waste acid treatment, and in particular to a method for comprehensively utilizing fluorine-containing waste acid to recover hydrofluoric acid, which is used to solve the problem that a large amount of fluorine resources are converted into sludge without economic utilization value in the existing fluorine-containing waste acid treatment method, which not only causes waste of fluorine resources, but also has the risk of secondary pollution. The method is to strip the fluorine-containing waste acid with ultrafine bubbles, and subject a part of the stripped gas to low-temperature water spray treatment to obtain aqueous hydrofluoric acid, and subject the other part of the stripped gas to temperature control to remove water vapor, and then subject it to chemical dehydration and condensation to obtain industrial anhydrous hydrogen fluoride, and subject residual liquid remaining after the ultrafine bubbles are stripped to reaction treatment, and acid solution and fluorosilicate are recovered. Through the reuse of the fluorine-containing waste acid, not only the resource utilization rate is improved, but also the impact on the environment is reduced. In addition, the process flow of the invention is simple and easy to implement, and is suitable for large-scale industrial production.

The present invention relates to the technical field of hydrogen fluoride preparation, and particularly to a method for separating a mixed solution containing hydrogen fluoride and sulfuric acid. The separation method includes: A) Concentrated fluorosilicic acid and concentrated sulfuric acid react in a reaction device to generate silicon tetrafluoride gas and a sulfuric acid solution containing hydrogen fluoride; B) The first part of the sulfuric acid solution containing hydrogen fluoride is subjected to two-stage separation to obtain hydrogen fluoride gas; the second part of the sulfuric acid solution containing hydrogen fluoride is heated and recycled to the reaction device. The present invention adopts two-stage separation; another path of the sulfuric acid solution containing hydrogen fluoride led out after the main reaction enters the reaction device again after being heated, with relatively low energy consumption. Therefore, the separation method provided by the present invention separates hydrogen fluoride from the sulfuric acid solution with relatively low energy consumption and can reduce fluorine loss.

The invention provides a calcium fluoride forming method and a calcium fluoride forming body, and belongs to the technical field of calcium fluoride preparation.The calcium fluoride forming method comprises the following steps that calcium fluoride raw powder is subjected to dispersion pretreatment, and pretreated powder is obtained; mixing the pretreated powder with hydroxypropyl methyl cellulose, a binder and water, and performing extrusion molding to obtain a preform; and drying and roasting the preformed body to obtain the calcium fluoride formed body. The calcium fluoride forming method provided by the invention does not need high temperature and high pressure, and is mild in process condition, low in cost, short in reaction time, low in energy consumption and high in production efficiency; the calcium fluoride forming body prepared by the method has a larger specific surface area, provides more action sites for water absorption in HCl and HF gases, does not need to be modified, is safer and more environment-friendly, and has higher mechanical strength.

The invention discloses a fluorine-containing mixed acid treatment method and system, and relates to treatment of fluorine-containing mixed acid after rare earth kiln tail gas is absorbed, and the fluorine-containing mixed acid treatment system comprises a pipeline assembly, a heater, a separator, a fluorine acid condenser, a fluorine acid collecting tank, a sulfuric acid condenser and a sulfuric acid collecting tank; a multi-effect concentration rectifying tower is connected to the pipeline assembly, mixed acid at the bottom of the front-effect concentration rectifying tower overflows into the rear-effect concentration rectifying tower, a heater is arranged in the concentration rectifying tower, and the heater is horizontally arranged in the concentration rectifying tower; a separator is arranged at the top of the concentration rectifying tower; the fluorine acid condenser is vertically arranged, and fluorine acid passing through the fluorine acid condenser enters the fluorine acid collecting tank; the sulfuric acid condenser is arranged at the tower bottom of the last-effect concentration rectifying tower; and the sulfuric acid passing through the sulfuric acid condenser enters the sulfuric acid collecting tank. The heater is horizontally arranged in the concentration rectifying tower, and the fluorine acid condenser is vertically arranged, so that sulfur separated by condensation of fluorine acid can be prevented from blocking the heater, and the fluorine-containing mixed acid treatment system can stably operate for a long time.

The invention belongs to the technical field of chemical engineering, and particularly relates to a preparation method of electronic-grade hydrofluoric acid. The method comprises the following steps: 1) arranging an electrolytic cell, filling a cathode region with a fluorine raw material solution, filling an anode region with an acidic raw material solution, and separating the anode region from the cathode region by an anion exchange membrane; 2) electrifying the electrolytic cell for electrolysis, and collecting gas in an anode region to obtain mixed feed gas; and (3) sequentially filtering, mixing, absorbing, cooling and recovering the mixed raw material gas to obtain the electronic-grade hydrofluoric acid. According to the method, synthesis and preliminary separation of hydrogen fluoride are achieved in one step through an electrolytic method, high-purity hydrogen fluoride can be effectively and stably obtained, ultra-high-purity electronic-grade hydrofluoric acid is rapidly prepared through aftertreatment, and the preparation process is relatively low in energy consumption, safe and environmentally friendly.

There is provided a method for producing iodine heptafluoride in which iodine heptafluoride having a low content of iodine gas can be produced with high yield. The method for producing iodine heptafluoride includes: a preparation step of preparing a liquid mixture containing iodine pentafluoride and hydrogen fluoride in which a content of the hydrogen fluoride is 0.1% by mass or more and 20% by mass or less with respect to a content of the iodine pentafluoride; a vaporization step of obtaining raw material mixed gas containing iodine pentafluoride gas, hydrogen fluoride gas, and fluorine gas by mixing fluorine gas with the liquid mixture to vaporize the liquid mixture; and a reaction step of producing iodine heptafluoride by causing the raw material mixed gas to react in a presence of a catalyst.

The invention provides novel azeotrope-like compositions and separation processes utilizing the same. An azeotrope-like composition comprising 1,2-difluoroethylene (HFO-1132) and hydrogen fluoride. An azeotrope-like composition comprising 1,1,2-trifluoroethylene (HFO-1123) and hydrogen fluoride. A separation process for a composition comprising at least one member selected from the group consisting of trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), and 1,1,2-trifluoroethylene (HFO-1123) and hydrogen fluoride.

Provided is a method for producing iodine heptafluoride with which it is possible to produce iodine heptafluoride having a low iodine gas content at a high yield. This method for producing iodine heptafluoride comprises: a preparation step for preparing a liquid mixture containing iodine pentafluoride and hydrogen fluoride, the hydrogen fluoride content being 0.1-20 mass% of the iodine pentafluoride content; a gasification step in which fluorine gas is mixed into the liquid mixture and the liquid mixture is gasified to obtain a raw material mixed gas containing iodine pentafluoride gas, hydrogen fluoride gas, and fluorine gas; and a reaction step in which the raw material mixed gas is reacted in the presence of a catalyst to produce iodine heptafluoride.

The invention relates to a preparation process of electronic-grade hydrofluoric acid, and belongs to the technical field of hydrofluoric acid preparation, and the method comprises the following steps: introducing anhydrous hydrofluoric acid into a precision filtering system for preliminarily filtering particulate matters, conveying the filtered anhydrous hydrofluoric acid to a reboiler, heating and gasifying to form gaseous hydrofluoric acid, conveying the gaseous hydrofluoric acid to a multi-stage condenser for stage-by-stage cooling, injecting an oxidizing agent, mixing with the liquid anhydrous hydrofluoric acid, heating and gasifying in a reboiler to form gaseous hydrofluoric acid, conveying the gaseous hydrofluoric acid to a particle filter to remove microparticles so as to form pure gaseous hydrofluoric acid, conveying the pure gaseous hydrofluoric acid to a mixing and cooling device, mixing with low-temperature ultrapure water, and cooling, forming electronic grade hydrofluoric acid; the device has the advantages that impurities with boiling points close to that of hydrofluoric acid can be conveniently removed, and the purity can be conveniently improved.

The invention provides a hydrogen fluoride production system and method, and belongs to the technical field of hydrogen fluoride production, the hydrogen fluoride production system comprises a reaction unit, a purification unit and a rectification unit which are arranged in sequence, and the rectification unit comprises a rectification tower, a first cooler, a second cooler and a cold crude acid tank; the first cooler is provided with a first cooling medium channel and a first working medium channel, and an inlet of the first working medium channel communicates with an outlet of the purification unit; the second cooler is provided with a second cooling medium channel and a second working medium channel, an inlet of the second working medium channel is communicated with an outlet of the first working medium channel, an outlet of the first working medium channel is communicated with an inlet of the second working medium channel, and an outlet of the first cooling medium channel is communicated with the rectifying tower; according to the invention, the liquid hydrogen fluoride is stored in the cold crude acid tank, so that the liquid hydrogen fluoride cools the gaseous hydrogen fluoride in the first cooler, a coolant does not need to be purchased or supplemented, and the production cost is reduced.

The invention relates to the technical field of hydrofluoric acid filtering, in particular to a filtering device for purifying electronic-grade hydrofluoric acid, which comprises an upper shell and a lower shell, and the upper shell and the lower shell are connected through a plurality of bolts; a filtering mechanism; the invention also relates to a filtering method for purifying electronic-grade hydrofluoric acid, which comprises the following steps: S1, adding hydrofluoric acid liquid into two filtering boxes through two liquid inlet pipes, then driving a motor to rotate clockwise, at the moment, driving two cams to rotate by a first one-way bearing, and at the moment, sliding two first plates back and forth, hydrofluoric acid liquid in the two filtering boxes is subjected to filter pressing, and flowing-out of hydrofluoric acid is accelerated. The filtering mechanism and the adjusting mechanism are arranged, the distance between the side wall of a triangular plate and the inner walls of a plurality of triangular filtering holes can be adjusted, the size of a filtering opening can be adjusted when hydrofluoric acid is purified and filtered, corresponding adjustment can be conducted according to the size of impurities in hydrofluoric acid liquid, and the purification effect on hydrofluoric acid is improved.

The invention discloses a system and a method for separating and purifying hydrogen chloride and hydrofluoric acid, belongs to the technical field of mixed gas separation, and aims to overcome the defects that a large amount of alkali liquor is consumed and the environment is influenced in the treatment of mixed gas of hydrogen chloride and hydrofluoric acid. The device comprises a sulfuric acid injection vacuum unit, a sulfuric acid absorption device and a sulfuric acid separation device, wherein sulfuric acid and mixed gas of hydrogen chloride and hydrofluoric acid are mixed in the sulfuric acid injection vacuum unit to absorb hydrofluoric acid to form mixed acid; mixed gas discharged from the sulfuric acid injection vacuum unit enters a sulfuric acid absorption device to be further mixed with sulfuric acid to absorb hydrofluoric acid to form mixed acid, and hydrogen chloride is separated and recycled; the sulfuric acid separation device separates the mixed acid to obtain sulfuric acid and hydrofluoric acid, the sulfuric acid flows back to the sulfuric acid injection vacuum unit and the sulfuric acid absorption device to be recycled, and the hydrofluoric acid is recycled. The hydrochloric acid and the hydrofluoric acid are recycled, so that the production cost is reduced, and no harmful waste is generated in the separation process.

Provided is a fluorine gas production method, which makes it possible to re-use a byproduct hydrogen fluoride, which is a byproduct produced during the production of a fluoride, i.e., a desired component, by reacting a raw material compound with a fluorine gas to fluorinate the raw material compound, as a raw material for the production of a fluorine gas by an electrolysis method. The fluorine gas production method comprises: a fluorination step of producing a reaction mixture comprising a main product fluoride, which is a desired component produced by fluorinating a raw material compound, and a byproduct hydrogen fluoride, which is produced as a byproduct; a separation step of separating the reaction mixture to produce a main product component containing the main product fluoride and a byproduct component containing the byproduct hydrogen fluoride; a purification step of purifying the byproduct component to produce such a recycled hydrogen fluoride component that the concentration of an organic substance contained in the byproduct component is decreased and the concentration of the byproduct hydrogen fluoride is increased; an electrolysis step of carrying out an electrolysis procedure using the recycled hydrogen fluoride component as at least a portion of an electrolyte solution to produce a fluorine gas; and an introduction step of introducing the fluorine gas produced in the electrolysis step into a reaction field for fluorination in the fluorination step.

Hydrofluoric acid-specific recovery system for the refining of industrial raw materials, comprising: a wastewater collection channel which receives hydrofluoric acid-containing wastewater, and an activated carbon filter system which filters out the organic substances and the oxidizing substances from the hydrofluoric acid-containing wastewater and then produces a first wastewater, and a capacitor-based deionization system which transports the ions of the first wastewater to an electrode of opposite charge and then produces a low-concentration fluorine wastewater, and also causes the ions to detach from the electrode and then produces a high-concentration fluorine wastewater, and a low-concentration collection channel which serves to receive the low-concentration fluorine wastewater, at least one filtration unit which filters the low-concentration fluorine wastewater and then produces recovery water for internal plant use, and a high-concentration collection channel.which serves to receive the highly concentrated fluorinated wastewater, and a reaction plant which produces a cryolite through a reaction of an added aluminum-containing sodium compound with the highly concentrated fluorinated wastewater.

The invention relates to the technical field of AHF purification, and provides an AHF purification method which comprises the following steps: step 1, pretreatment; step 2, multi-stage filtration; step 3, ultrasonic-assisted adsorption; 4, membrane separation and purification; step 5, freezing crystallization; 6, rectifying and refining; and 7, tail gas treatment. According to the AHF purification method, through a series of fine operations such as multi-stage filtration, ultrasonic-assisted adsorption, membrane separation purification, freezing crystallization and rectification refining, the purity of AHF is remarkably improved to 99.99% or above, and the requirements of high-purity products are met. The impurity removal effect is enhanced through multi-stage filtration and ultrasonic-assisted adsorption, the purification efficiency is improved through membrane separation purification and freezing crystallization, and the separation effect is further improved through combination of rectification refining and a novel tower plate structure and filler. Tail gas treatment realizes environment-friendly emission through multi-stage absorption and catalytic reaction, and product stability and consistency are ensured through quality detection and adjustment.

The invention discloses a method for recovering mixed acid waste liquid containing hydrofluoric acid, comprising reacting a raw material with a sodium salt or a potassium salt, and then filtering to obtain a filtrate; the raw material is a mixed acid waste liquid containing hydrofluoric acid; the filtrate is sent to a diffusion dialysis device for treatment, the diffusion dialysis device includes a homogeneous anion exchange membrane; the recovered liquid obtained by the treatment of the diffusion dialysis device is sent to a membrane separation device, the membrane material of the membrane separation device is an acid-resistant metal ion removal membrane, and the recovered mixed acid is obtained on the permeation side of the membrane separation device. The invention can effectively remove impurities and metal ions in low-concentration waste acid solutions, so that the products meet the electronic grade reuse standard, improve the resource recovery rate, and have a simple process flow and low energy consumption, which is suitable for industrial promotion and application.

The application discloses a vulcanization system and method for silicone rubber based on SF6 waste gas plasma reduction treatment. In the system, a mixed gas chamber, a discharge system, a vulcanization system, a separation gas chamber and a collection gas bottle are sequentially connected by gas paths, the separation gas chamber is connected with the mixed gas chamber through a dilution gas chamber, flow meters and electromagnetic valves are arranged between the mixed gas chamber and the discharge system, between the mixed gas chamber and the dilution gas chamber, and between the separation gas chamber and the dilution gas chamber, and an ultraviolet light source is used for providing light for the discharge system and the vulcanization system, wherein a catalyst is arranged in the discharge system, SF6 waste gas, hydrogen and dilution gas can be introduced into the mixed gas chamber. The application can efficiently utilize S elements in SF6 waste gas, degrades SF6 through catalysis, realizes vulcanization treatment of silicone rubber base material in real time by taking S as a vulcanizing agent while depositing S in the form of an element, finally converts S elements in SF6 waste gas into vulcanized silicone rubber in the form of vulcanization crosslinking, and achieves the purpose of resource utilization of S elements in SF6 waste gas.