20results about "Fluorine" patented technology

The invention provides a directional recovery method of pickling wastewater. According to the treatment method disclosed by the invention, a decomplexing agent is used for promoting a complex of fluorine, iron, chromium and nickel to be dissociated into free fluorine, then nanofiltration is adopted for realizing separation of the free fluorine, the iron, the chromium and the nickel, and a fluorine removal agent is added into the separated fluorine-rich solution for realizing fluorine recovery, so that the problem that the complex fluorine is difficult to recover is solved; meanwhile, according to the treatment method, a reducing agent is added into a separated solution rich in iron, chromium and nickel to promote ferric ions to be reduced into ferrous ions, then ion exchange resin is used for preferentially adsorbing chromium and nickel, the ion exchange resin containing chromium and nickel is subjected to desorption treatment, and then graded recovery of chromium and nickel is achieved through gradient pH regulation and control. And finally, pH regulation and control are carried out on the effluent obtained after ion exchange resin adsorption, iron recovery can be achieved, and therefore the problem that separation is difficult due to the fact that the pH of iron and chromium precipitates is close is solved.

To provide a manufacturing method of a hydrogen fluoride remover unlikely to cause deterioration nor cause a necessity of replacement.SOLUTION: A manufacturing method of a hydrogen fluoride remover manufactures a hydrogen fluoride remover configured to remove hydrogen fluoride from a crude fluorine gas being a fluorine gas containing hydrogen fluoride. The manufacturing method includes a sintering step of sintering a molded body of the sodium fluoride at a temperature of 700°C to 900°C to obtain a sintered body.SELECTED DRAWING: None

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.

The present disclosure relates to a method for removing fluoride from an acidic solution that involves a series of precipitation steps that selectively increase the pH using a neutralizing agent.

Disclosed is a solid argyrodite electrolyte doped with fluorine (F). In some embodiments, the argyrodite electrolyte has a formula (I), Li7-nPS6-nHan-xFx (I), wherein Ha is a halogen element other than fluorine (F), 0.02 ≤ x < 0.1, and 1.0 < n < 2.0. In some embodiments, 1.2 ≤ n ≤ 1.6. In some embodiments, 0.02 ≤ x ≤ 0.08. In some embodiments, the ASSB comprising the solid argyrodite electrolyte exhibits an increased CCD and an improved electrochemical performance.

The invention discloses a production method of high-purity fluorine-nitrogen mixed gas, and belongs to the technical field of fluorine chemical industry. The method comprises the following steps: mixing high-purity nitrogen trifluoride and high-purity nitrogen according to a molar ratio of 1: (5.5-10), introducing the mixture into a cracker, reacting at the reaction temperature of 1000-1250 DEG C under the pressure of 0.2-0.7 Mpa until the pressure is not changed any more, cooling the reacted gas through a condenser, introducing the cooled gas into a buffer tank 1, compressing the cooled gas through a compressor, introducing the compressed gas into a de-heavy rectifying tower to remove heavy component impurities, and recovering the heavy component impurities to obtain the high-purity nitrogen trifluoride. And gas extracted from the top of the rectifying tower is introduced into the buffer tank 2, compressed by the compressor and then filled into a steel cylinder. The nitrogen is introduced into the cracking reaction, so that the safety of the reaction can be ensured, meanwhile, the production links of purifying fluorine gas and removing nitrogen impurities after the nitrogen trifluoride is cracked are reduced, the fluorine-nitrogen mixed gas with the preset concentration can be directly produced, the production cost is reduced, the production links are reduced, and the 20% fluorine-nitrogen mixed gas can be directly prepared.

Disclosed is a method for efficiently removing fluorine from a spent lithium battery. The method comprises: mixing aluminum and a sodium hydroxide solution for reaction to obtain a sodium metaaluminate solution; introducing sulfuric acid into the sodium metaaluminate solution, and stirring to react at a certain temperature to obtain a fluorine removal agent; adding a sodium fluoroaluminate seed crystal and the fluorine removal agent into an impurity-removed battery powder leaching solution, introducing a sodium carbonate solution at the same time, performing reaction at a certain temperature, controlling the pH value of a reaction endpoint, and performing solid-liquid separation after the reaction is finished to obtain a fluorine-removed liquid and filter residues; and adding the sodium hydroxide solution into the filter residues for reaction, and performing solid-liquid separation to obtain a filtrate containing fluorine and aluminum, and insoluble residues. According to the present invention, fluorine removal is induced by adding the sodium fluoroaluminate seed crystal; and during fluorine removal, the seed crystal sodium fluoroaluminate is firstly added into the battery leaching solution, and by means of induction of the seed crystal, combination of fluorine and aluminum in the solution can be accelerated to generate sodium hexafluoroaluminate, the reaction time is shortened, the fluorine removal efficiency is improved, and fluorine in the solution can be removed to be lower than 20 mg / L, thereby achieving the purpose of deep fluorine removal.

The utility model relates to the technical field of wet-process phosphoric acid concentration production equipment, in particular to a device for improving the fluorine recovery rate in the wet-process phosphoric acid concentration process, which comprises a demister, a first washing tower connected to one end of the demister, a second washing tower connected to one end of the first washing tower, and a heat exchanger connected to one end of the second washing tower. The bottom end of the heat exchanger is connected with a condensation water tank, one side of the top of the condensation water tank is connected with a gas exhaust pipe, the other side of the top of the condensation water tank is provided with a liquid inlet pipe, and one side of the bottom of the condensation water tank is connected with a condensation water pipe. According to the device for improving the fluorine recovery rate in the wet-process phosphoric acid concentration process, the problems of fluorine escape and loss in the wet-process phosphoric acid concentration process are effectively solved through optimization design and integration of key components. According to the device, a series structure of the demister, the first washing tower, the second washing tower and the heat exchanger is utilized, so that multi-stage washing and efficient recovery of fluorine-containing gas are realized.

Disclosed is an apparatus for honeycomb ceramic-based plasma degradation of SF6 in the technical field of sulfur hexafluoride degradation, including a DBD reactor, where a gas supply unit is arranged on a left side of the DBD reactor, a power supply unit is arranged at a bottom of the DBD reactor, a treatment unit is arranged on a right side of the DBD reactor, and the DBD reactor is connected to the gas supply unit via a gas pipe and electrically connected to the power supply unit. The apparatus breaks away from the conventional single-tube structured inner electrode by adopting a novel detachable honeycomb ceramic structure as the inner electrode of the reactor; its porous structure provides good channels for gas flow and distribution; the porous channels facilitate the adsorption of catalysts and decomposition products, effectively promoting the degradation process.

The utility model discloses a device for removing hydrogen fluoride in fluorine gas, which comprises a hydrogen fluoride condensing tower, the upper part of the hydrogen fluoride condensing tower is provided with a nitrogen back-blowing gas inlet pipeline and an F2 gas outlet pipeline, and the lower part of the hydrogen fluoride condensing tower is provided with an F2 gas inlet pipeline and a nitrogen gas outlet pipeline; the F2 gas inlet pipeline is used for enabling F2 to be treated to enter the hydrogen fluoride condensing tower; a blow-off pipeline is arranged at the bottom of the hydrogen fluoride condensing tower; a jacket is arranged on the outer wall of the hydrogen fluoride condensing tower, a refrigerating fluid filling port is formed in the upper part of the jacket, a refrigerating fluid discharging port is formed in the lower part of the jacket, and refrigerating fluid is filled in the jacket; the hydrogen fluoride condensation temperature control device can well control the hydrogen fluoride condensation temperature, avoids overlarge temperature fluctuation caused by direct liquid nitrogen cooling and difficulty in stable control of the hydrogen fluoride condensation temperature, and simultaneously avoids the safety problem caused by fluorine liquefaction due to overlow hydrogen fluoride condensation temperature caused by difficulty in temperature control.

The application provides a directional recovery method of pickling wastewater. The treatment method of the application uses a complexing agent to cause the complex of fluorine and iron, chromium and nickel to be dissociated into free fluorine, and then uses nanofiltration to realize the separation of free fluorine and iron, chromium and nickel, and adds a fluorine removal agent to the fluorine-rich solution after separation to realize fluorine recovery, thereby solving the problem that the complex state fluorine is difficult to recover. Meanwhile, the treatment method adds a reducing agent to the solution rich in iron, chromium and nickel after separation to cause the trivalent iron ion to be reduced to divalent iron ion, and then uses ion exchange resin to preferentially adsorb chromium and nickel, desorbs the ion exchange resin containing chromium and nickel, and realizes the graded recovery of chromium and nickel through step-by-step pH regulation. Finally, the effluent after the adsorption of the ion exchange resin can also realize iron recovery through pH regulation, thereby solving the problem that iron and chromium are difficult to separate due to the close pH of the precipitation.

The invention discloses a preparation method and application of a sodium-ion battery positive electrode material, and belongs to the technical field of sodium-ion battery positive electrode materials, and the preparation method comprises the following steps: (1) adding an iron source, a manganese source, a sodium source, a phosphorus source and a carbon source into deionized water, and stirring until a uniform solution without suspended precipitates is obtained; (2) performing spray drying on the solution to obtain precursor powder; (3) calcining the precursor powder under protective gas; and (4) calcining the material in an NF3 atmosphere to obtain the sodium ion battery positive electrode material. The Mn element and the fluorine element are doped by adopting a fractional step method, the fluorine element is doped by adopting a vapor deposition method, high-activity fluorine free radicals are generated by decomposing NF3, and fluorine doping is realized by replacing oxygen atoms or embedding crystal lattices, so that the stability of a crystal structure is optimized, sodium ion migration is accelerated, and the electrochemical performance is improved.

The invention discloses a method and system for comprehensive utilization of liquid lithium hexafluorophosphate production tail gas, and the method comprises the following steps: compression and condensation: pressurizing the liquid lithium hexafluorophosphate production tail gas to 1-2 Mpa, and condensing the compressed tail gas at 10-20 DEG C to respectively obtain a first condensate and a first uncondensed gas; fluorine recovery: the first uncondensed gas is rectified in a rectifying tower, the kettle bottom temperature of the rectifying tower is 80-95 DEG C, gas at the top of the rectifying tower is condensed at 30-40 DEG C after being extracted, and second condensate and second uncondensed gas are obtained through separation; and hydrogen chloride recovery: contacting the second uncondensed gas with a defluorination agent in a defluorination tower for defluorination, and carrying out multi-stage absorption of hydrochloric acid on the defluorinated gas to obtain a high-purity hydrochloric acid product. The method has the advantages of low energy consumption, high quality of by-product hydrochloric acid and recyclability of fluorine resources.

The application discloses a method for recycling F in fluorite waste residue, and belongs to the technical field of fluorite recycling. The method comprises the following steps: mixing and reacting phosphorite slurry doped with fluorite waste residue with a first phosphoric acid solution and an acid solution containing sulfuric acid, then performing crystal growing treatment, and performing solid-liquid separation to obtain phosphogypsum and finished product phosphoric acid; the mass ratio of the fluorite waste residue contained in the phosphorite slurry to the phosphorite powder is 0.01:100 to 4:100. The phosphogypsum and the finished product phosphoric acid obtained by the method both contain F, and the effect of recycling F in fluorite is achieved.

The utility model provides industrial equipment for producing fluorophosgene, which comprises a reactor, a reactor, a gas inlet pipe, a gas outlet pipe and a gas outlet pipe, the first gas inlet mechanism comprises a first gas inlet pipe, a distributor and a plurality of groups of nozzles with different lengths, the distributor is arranged in the reaction cavity, the first gas inlet pipe is communicated with the distributor, the distributor is sequentially provided with a plurality of annular gas inlet areas from outside to inside, and the length of the nozzles arranged on the gas inlet area on the outer side is smaller than that of the nozzles arranged on the gas inlet area on the inner side; the second gas inlet mechanism is communicated with the reaction cavity; and the exhaust mechanism is communicated with the reaction cavity. According to the equipment provided by the utility model, the length of the nozzles arranged on the outer side gas inlet area is smaller than that of the nozzles arranged on the inner side gas inlet area, the longer nozzles are arranged at the high-pressure position of the distributor, and the shorter nozzles are arranged at the periphery of the low-pressure position of the distributor, so that the temperatures of the reaction are relatively balanced; the generation of a by-product CF4 due to overhigh local temperature or local excessive fluorination caused by violent reaction is avoided.

The application belongs to the technical field of fluorine chemical industry, and particularly relates to a preparation method of a fluorinated salt adsorbent for fluorine gas purification and application thereof, aiming to solve the problems of low porosity, small adsorption capacity, low structural strength, and serious pulverization rate of the fluorinated salt adsorbent in the prior art, which are not conducive to industrialized continuous generation. The fluorinated salt adsorbent has a large specific surface area, high adsorption capacity, high strength, and good fluorine gas purification effect. The preparation method is simple, has small equipment corrosion, and can be popularized for industrialized production. The application adopts alkali solution reaction, fluorination etching, and calcination decomposition steps, can completely convert fluorosilicate powder into the fluorinated salt adsorbent, and is helpful to the pore-forming effect of the fluorinated salt adsorbent. The application does not need to add an organic binder, can realize granulation and molding by using the reaction of the fluorosilicate powder and the alkali solution, and has good structural strength in the preparation of the fluorinated salt adsorbent.

The present application relates to the field of comprehensive utilization of wet-process phosphoric acid resources and preparation of new energy materials, and discloses a method for selectively recovering fluorine from wet-process phosphoric acid and preparing lithium difluorophosphate. By adding boric acid to the wet-process phosphoric acid, the fluorine species is converted, and tri-octylamine organic extraction system is used to selectively separate fluorine and phosphorus, and then lithium fluoroborate is prepared by back extraction, and further reacts with anhydrous oxalic acid to generate lithium difluorophosphate, and after recrystallization, battery-grade lithium difluorophosphate with a purity of 99.7% or above is obtained. The method realizes efficient recovery and high-value conversion of by-product fluorine resources in wet-process phosphoric acid, has the advantages of simplified process, high extraction selectivity, high resource utilization rate and significantly improved product added value, and can be used for preparation of lithium ion battery electrolyte.

Direct Board-to-Board Bonding Method. The invention relates to a method for directly bonding a first microelectronic device (100) to a second microelectronic device (200), comprising supplying a first device having a first flat surface (110) and a second device having a second flat surface (210), treating at least the first and second surfaces with a plasma gas comprising at least a first fluorinated gas having an atomic percentage F of fluorine, transferring the first and second devices to bonding equipment, immersing the first and second surfaces in a bonding atmosphere (1), and bonding the first and second surfaces under the bonding atmosphere. The atomic percentage F of fluorine and the relative humidity RH are controlled synergistically so that a bonding velocity Vc is less than or equal to 15 mm / s and more specifically less than 10 mm / s.Figure for the abridged version: Fig.4.

The invention relates to the technical field of sulfur hexafluoride degradation and discloses a honeycomb ceramic plasma degradation device for SF6, comprising a DBD reactor, a gas supply unit being arranged on the left side of the DBD reactor, a power supply unit being arranged at the bottom of the DBD reactor, and a processing unit being arranged on the right side of the DBD reactor, wherein the DBD reactor and the gas supply unit are connected via a gas pipe, and the DBD reactor and the power supply unit are electrically connected; the device breaks away from the traditional single-tube structure of the inner electrode and adopts a novel detachable honeycomb ceramic structure as the inner electrode of the reactor; the porous structure thereof provides a good channel for the flow and distribution of gas, and the porous channel facilitates the adsorption of catalysts and decomposition products, and can effectively promote the degradation process; at the same time, the honeycomb ceramic is used as the inner electrode in a detachable design, and the inner electrode tube is inserted into a slightly larger hole in the middle of the honeycomb ceramic, which facilitates the installation, cleaning and maintenance of the device and reduces the operating cost.

The invention relates to a liquid fluorine purification rectifying tower which comprises a tower top condenser, a rectifying tower kettle and a rectifying tower body arranged on the rectifying tower kettle, the rectifying tower kettle and the rectifying tower body are both made of titanium steel alloy materials, and the tower top of the rectifying tower body is connected with the input end of the tower top condenser. The tower top of the rectifying tower body is provided with a tower top temperature measuring port, the tower top temperature measuring port is provided with a temperature measuring piece, and the temperature measuring piece is interlocked with a refrigerant inlet valve and a refrigerant outlet valve of a tower top condenser. The rectifying tower is made of a titanium steel alloy material, so that the service life of the tower can be prolonged, the maintenance cost is reduced, and major safety and environmental protection hidden dangers caused by improper material selection are solved; the efficiency and stability of the rectifying tower are greatly improved, energy consumption and emission are reduced, and the safe, environment-friendly and efficient effects are achieved.