183results about "Fluorine/hydrogen-fluoride" patented technology

The invention discloses a big data-driven hydrogen fluoride purification risk entropy assessment and multi-parameter monitoring system, which relates to the technical field of chemical process monitoring, comprises a multi-mode heterogeneous sensor network, and realizes high-precision detection and three-dimensional monitoring by using a nanowire FET (Field Effect Transistor) and the like. The space-time tensor decomposition module extracts features and identifies a causal relationship; the risk entropy manifold learning module evaluates the risk; the self-adaptive twin network monitors the abnormity and simulates and disposes the abnormity; and a knowledge graph-reinforcement learning system decision making subsystem and a plurality of subsystems such as an optical monitoring subsystem and a multi-scale modeling subsystem are also provided, so that whole-process risk management and control are realized. The hydrogen fluoride purification monitoring level is greatly improved, the detection sensitivity and the anomaly detection accuracy are remarkably improved, risk early warning is more timely, decision response is accelerated, the production efficiency is improved, energy consumption is reduced, the system has self-repairing and self-power-supply capabilities, data are safe and traceable, reliable operation of the system is guaranteed, and economic losses and potential safety hazards are reduced.

The invention discloses a preparation method of hydrogen fluoride, hydrogen fluoride and a battery material. The preparation method comprises the following steps: reacting a fluosilicic acid solution with a sulfuric acid solution to obtain mixed gas and fluorine-containing sulfuric acid; the content of hydrogen fluoride in the mixed gas is 10%-20%, and the content of hydrogen fluoride in the fluorine-containing sulfuric acid is 90%-80%; treating the mixed gas with concentrated sulfuric acid to obtain absorbed sulfuric acid; performing falling film evaporation treatment on fluorine-containing sulfuric acid to obtain a hydrogen fluoride-containing gas phase; and absorbing sulfuric acid to wash the hydrogen fluoride-containing gas phase to obtain hydrogen fluoride gas. The preparation method of hydrogen fluoride provided by the invention is beneficial to improving the recovery rate of hydrogen fluoride.

The invention discloses hydrogen fluoride, a preparation method thereof and a battery material. The preparation method of hydrogen fluoride comprises the steps that fluosilicic acid and first sulfuric acid react to generate mixed gas and first mixed sulfuric acid, the first mixed sulfuric acid is a sulfuric acid solution containing hydrogen fluoride, and the mixed gas comprises silicon tetrafluoride gas and hydrogen fluoride gas; washing the mixed gas with second sulfuric acid to obtain second mixed sulfuric acid and washed silicon tetrafluoride gas; the second mixed sulfuric acid is obtained by absorbing the hydrogen fluoride gas by second sulfuric acid; washing the water-containing hydrogen fluoride with second mixed sulfuric acid to obtain crude hydrogen fluoride gas; and purifying the crude hydrogen fluoride gas to obtain anhydrous hydrogen fluoride. According to the preparation method of the hydrogen fluoride, through washing treatment of the second sulfuric acid and washing treatment of the second mixed sulfuric acid, the recovery rate of the hydrogen fluoride is remarkably increased.

The invention discloses an in-kettle environment pressure stabilizing structure applied to an anhydrous hydrogen fluoride arsenic removal process, relates to the technical field of arsenic removal processes, and provides an improvement process about a rubber isolation pad and a lower supporting table on the basis of an oxidation reaction process in the anhydrous hydrogen fluoride arsenic removal process and on the basis of not changing the reaction process. The basic content is as follows: the reaction volume in the reaction cavity is changed by utilizing the elastic deformation of the rubber isolation pad and the supporting effect of the lower supporting table, so that the effect of preliminarily adjusting the environmental pressure in the reaction cavity is achieved; a combined or independent regulation and control process is carried out mainly aiming at a low-pressure state and an overpressure state, a pressure difference and pressure balance transfer principle is further utilized, and the environment pressure stabilizing effect in a container is achieved through the simplest and effective structure.

The invention discloses a BOE waste liquid treatment method and device. The method comprises the following steps: replacing hydrogen fluoride in BOE waste liquid with sulfuric acid, evaporating, fractionating and recovering hydrofluoric acid, neutralizing evaporated residual liquid with ammonia to obtain a fluorine-containing ammonium sulfate solution, defluorinating with fluorgypsum slurry to obtain a low-fluorine ammonium sulfate solution, and concentrating and crystallizing to obtain an ammonium sulfate product. The BOE waste liquid is treated by adopting the scheme, the bottleneck of the market capacity of ammonium bifluoride is avoided, the hydrofluoric acid product and the ammonium sulfate product with huge market capacity are produced, the value orientation of turning waste into wealth, circular economy and environmental protection is really realized, and the method is suitable for industrial popularization and application.

The present application provides a method for comprehensive recycling of aluminum electrolysis waste cathode water leaching and pressurized purification, which relates to the field of solid waste recycling. The method comprises: mixing raw materials including aluminum electrolysis waste cathode, water and hydrogen peroxide, heating for water leaching, and then performing solid-liquid separation to obtain filtrate and water-leached material; mixing the water-leached material with concentrated sulfuric acid for a first high-pressure closed acid leaching, and performing solid-liquid separation on the reaction system to obtain filtrate residue; mixing the filtrate residue, concentrated sulfuric acid, concentrated hydrochloric acid, hydrogen peroxide solution and water, and performing a second high-pressure closed acid leaching, and performing solid-liquid separation on the reaction system to obtain artificial graphite. The method is simple to operate, has little corrosion to the equipment, and can not only obtain a graphite particle product with a fixed carbon content of more than 97%, but also recover the fluorine in the waste cathode in the form of hydrofluoric acid. On the basis of effectively solving the problem of fluoride pollution in the waste cathode, it also realizes the high-quality utilization of fluoride and graphite in the waste cathode.

The utility model discloses an electronic-grade hydrofluoric acid production system, industrial hydrofluoric acid is input into the system to obtain high-purity electronic-grade hydrofluoric acid, and the system comprises a graphite evaporator, a rectifying tower and a condenser, the graphite evaporator is provided with a feeding pipeline and a condensed water outlet, and the feeding pipeline is used for inputting industrial hydrofluoric acid into the graphite evaporator; a steam pipeline is further arranged on the graphite evaporator, the other end of the steam pipeline is connected with the rectifying tower, the steam pipeline is used for conveying gas heated by the graphite evaporator into the rectifying tower, and the rectifying tower is used for rectifying and separating hydrofluoric acid gas produced by the graphite evaporator; industrial hydrofluoric acid is added into the graphite evaporator to be heated to obtain hydrofluoric acid, then the hydrofluoric acid is fed into the rectifying tower with a certain height to be distilled, backflow is conducted in proportion, the product quality meets the requirement, and continuous production can be achieved through combination of the graphite evaporator and the rectifying tower; liquid hydrofluoric acid is used as a raw material, high risk of anhydrous hydrogen fluoride gas is avoided, and safety of the system is improved.

The invention provides a calcium fluoride sludge purification method, calcium fluoride fine powder and application thereof, and belongs to the field of calcium fluoride sludge treatment.The calcium fluoride sludge purification method comprises the following steps that calcium fluoride sludge and water are mixed to form a first mixed solution, a phosphate conversion agent is added, heating and stirring are conducted, and then filtering is conducted to obtain a first solid mixture; adding an acid solution into the first solid mixture, heating, stirring and filtering to obtain a second solid mixture; and water, an inhibitor, a collecting agent and a foaming agent are sequentially added into the second solid mixture to form a third mixed solution, flotation is conducted, and calcium fluoride fine powder is obtained. Impurity elements can be removed through combination of phosphate conversion and a flotation method, and compared with a method for removing calcium phosphate and calcium sulfate through a chemical treatment method, the reagent dosage is greatly reduced, the temperature needed by conversion is low, the conversion time is short, and the cost is low.

The invention discloses a molybdenum disulfide acid leaching purification process, relates to the technical field of molybdenum disulfide purification, and aims to solve the problems of waste acid recycling, wastewater treatment and equipment corrosion in the molybdenum disulfide purification process. The molybdenum disulfide acid leaching purification process comprises the following steps: S1, acid purification: adding a molybdenum concentrate raw material into a reaction kettle; adding reaction acid into the reaction kettle according to a certain solid-to-liquid ratio, heating the reaction kettle to react for a period of time, and cooling to dissolve impurities in the molybdenum concentrate; s2, filter pressing and cleaning: conveying the acid-washed material to a plate frame for filter pressing to form a filter cake, cleaning the filter cake with clear water for 2-4 times until the wastewater is neutral, and conveying the filter cake to the plate frame for filter pressing again; s3, repeating acid purification and filter-pressing cleaning for several times until various acids are used up in the process; and S4, drying: putting the cleaned filter cake into a drying system for drying to obtain the high-purity molybdenum disulfide with the purity of more than or equal to 99%. According to the acid leaching purification process, impurities in molybdenum disulfide are selectively dissolved, the purity of molybdenum disulfide is remarkably improved, and the industrial application requirement is met.

The utility model discloses an ultra-clean high-purity electronic-grade hydrofluoric acid efficient purification device, comprising a distillation tower, a condensation box fixedly installed on the top of the distillation tower, a cavity opened inside the condensation box, an inflation tube installed on the top shell wall of the condensation box, the inflation tubes are evenly distributed on the top outer wall of the condensation box and are connected with the inside of the condensation box, an air bag is arranged on the top of the inflation tube, the air bag is connected with the inflation tube, the air bag is in a flat state in the initial state, a folding hose is connected between every two air bags, and the folding hose is connected with the air bag. With the increase of the amount of hydrogen fluoride gas in the condensation box, the hydrogen fluoride gas enters the air bag and gradually inflates the air bag. The gas will automatically flow to other air bags with less gas through the folding hose, balancing the air pressure in each air bag, and producing a pressure relief buffer effect. Moreover, the air bag changes from flat to full, which can remind the staff that there is too much high-purity hydrogen fluoride gas in the condensation box and collect it in time.

The invention relates to a high-temperature acidolysis reaction defluorination method, and belongs to the technical field of phosphorus chemical resource recycling. The technical problem to be solved by the invention is to provide a high-temperature acidolysis reaction defluorination method which is simple to operate and high in defluorination rate. According to the method, phosphorite powder / white fertilizer is subjected to high-temperature acidolysis, fluoride in the phosphorite powder / white fertilizer reacts with strong acid, fluorine is separated from a reaction system in a gas form, and hydrofluoric acid is obtained through condensation. The method is simple, is simple and convenient to operate, and is easy to realize technologized large-scale production. Meanwhile, due to the destructive effect of the strong acid on the lattice structure of the phosphorus-calcium compound, citrate-soluble phosphorus can be converted into soluble phosphate, subsequent phosphorus recovery is facilitated, comprehensive utilization of phosphorite and elimination of white fertilizer output are achieved, meanwhile, the problems of material accumulation and resource waste of enterprises are solved, and the method conforms to the circular economy concept of green development.

The utility model relates to the technical field of chemical production equipment, and particularly discloses a chlorine-containing hydrogen fluoride separation system which comprises a condensing tower and an absorption separation tower which are sequentially connected, an absorption separation device comprises a tower body, a distribution disc and a filler section are sequentially arranged in the tower body from top to bottom, and a liquid inlet and a gas outlet are formed in the upper end of the tower body; a liquid outlet and an air inlet are formed in the lower end of the tower body, the air inlet and the liquid inlet are both formed in the radial direction of the tower body, and the liquid outlet and the air outlet are both formed in the axial direction of the tower body; dilute sulfuric acid is introduced into the liquid inlet. The utility model aims to solve the problem that the absorption and separation effect of chloride ions in fluosilicic acid of a separation system is not ideal in an existing production system for preparing hydrofluoric acid by a fluosilicic acid method.

The utility model discloses an anhydrous hydrofluoric acid rectification device which comprises a spray tower and a material storage tank, a liquid inlet pipe is arranged on one side wall of the spray tower, two groups of rectification assemblies are arranged on the side wall, far away from the liquid inlet pipe, of the spray tower through liquid outlet pipes, the rectification assemblies are connected with the material storage tank, and the spray tower is provided with a spray assembly through a rotary cleaning mechanism. A collecting box is arranged at the bottom end of the spraying tower, a filtering assembly is arranged in the collecting box through a mounting mechanism, and a liquid discharging pipe is arranged at the bottom end of the collecting box. According to the utility model, produced anhydrous hydrofluoric acid can be firstly sprayed and washed to ensure full and uniform spraying, so that the washing effect is ensured, a small amount of impurities are removed, then rectification and condensation operation is carried out, the purity of the anhydrous hydrofluoric acid can be effectively ensured, and the inner wall of the spray tower can be scraped when the inner wall needs to be cleaned and scraped, so that the inner wall of the spray tower can be cleaned and scraped. And the inner cleanliness is ensured, the situation that the service life and the spraying and washing effect are affected due to corrosion is avoided, and the spraying device is connected with the spraying connecting pipe after cleaning is completed, so that follow-up spraying and washing are facilitated.

The utility model discloses an energy-saving rectifying tower for producing electronic grade hydrofluoric acid and capable of preventing external pollution, and particularly relates to the technical field of rectifying towers, the energy-saving rectifying tower comprises a tower drum, a tower plate and air holes, the top end of the tower drum is provided with a leakage-proof discharging assembly and a discharging pipe, the top end of the discharging pipe is provided with an external pipe, and the external pipe is provided with an air inlet and an air outlet. And a sealing cover is arranged on the outer side of the discharging pipe, a purifying box is installed on one side of the sealing cover, and an activated carbon filter plate is installed on one side in the purifying box. The sealing cover and the purifying box are arranged, the sealing cover covers the outer side of the discharging pipe, the side end of the sealing cover is communicated with the purifying box, the draught fan in the purifying box is started, gas in the sealing cover can be assisted to enter the purifying box, if materials leak, the activated carbon filter plate can be used for assisting purification treatment, and then the materials are discharged after treatment; and the leakage pollution prevention of the rectifying tower in use is realized.

The invention discloses a method for preparing anhydrous hydrogen fluoride, anhydrous hydrogen fluoride and application, and the method comprises the following steps: mixing first fluorine-containing sulfuric acid with water for reaction to obtain a reaction solution containing hydrogen fluoride; evaporating the reaction liquid containing hydrogen fluoride to obtain an evaporated liquid phase and an evaporated gas phase; washing the evaporated gas phase to obtain a washed gas phase; and condensing the washed gas phase to obtain anhydrous hydrogen fluoride. The method is low in cost and high in economic benefit, the yield of the by-product sulfuric acid is about 1.5 times lower than that of a fluosilicic acid method, the application channel of the by-product sulfuric acid is wider than that of the by-product sulfuric acid of the fluosilicic acid method, and the environmental protection pressure in the preparation process is low. Meanwhile, anhydrous hydrogen fluoride is prepared from the by-product fluorine-containing sulfuric acid, so that recycling of resources is realized.

The application relates to a method and a preparation system for preparing hydrogen fluoride from fluosilicic acid, which comprises a reaction kettle, a hydrogen fluoride absorption tower, a condenser and a silicon tetrafluoride absorption tower which are sequentially communicated; a gas outlet of the reaction kettle is communicated with a gas inlet of the hydrogen fluoride absorption tower, and a gas outlet of the hydrogen fluoride absorption tower is communicated with a gas inlet of the condenser; the generated fluorosulfonic acid in the reaction kettle is introduced into a stripping tower, fluorosulfonic acid generated in a side reaction is re-generated into hydrogen fluoride, the generation of intermediate products is reduced, the process route of the application is free of waste residues and waste gas, and fluosilicic acid is effectively utilized.

The invention discloses a method for producing anhydrous hydrofluoric acid from photovoltaic fluorine-containing waste materials. The waste materials are fluorine-containing solid press filter residues or filter cake biscuits obtained through solid-liquid separation after photovoltaic fluorine-containing waste liquid treatment. The method comprises the following steps: drying, crushing and screening the waste until the waste is matched with the fluorite powder in particle size, returning the oversize product to the crushing, closed-loop granulating and homogenizing; continuously metering and uniformly mixing the homogenized waste and fluorite powder according to a mass ratio of 20: 1 to obtain a mixed fluorine-containing raw material, and continuously feeding the mixed fluorine-containing raw material into a rotary reaction furnace; fuming sulfuric acid and concentrated sulfuric acid are mixed into mixed acid, the mixed acid is continuously added into a reaction furnace, the mixed acid reacts at the temperature of 300-350 DEG C to generate a fluorine-containing gas phase, and reaction heat is indirectly provided by circulation of high-temperature gas in a jacket of the reaction furnace; the crude product gas enters a degassing tower to remove SO2 and SiF4 after being subjected to dust removal, washing, cooling, condensation, rectification, deacidification and dehydration, and an anhydrous hydrofluoric acid product is obtained. According to the method, waste recycling is achieved, and fluorite consumption and waste disposal amount are reduced.

The invention discloses a method for preparing hydrogen fluoride and co-producing fumed silica from low-concentration fluosilicic acid, which belongs to the technical field of inorganic chemical industry and comprises the following steps: concentrating low-concentration fluosilicic acid under reduced pressure; mixing concentrated sulfuric acid with system circulating sulfuric acid, reacting with concentrated fluosilicic acid, and performing gas-liquid separation to obtain mixed liquid of silicon tetrafluoride gas, hydrogen fluoride and sulfuric acid; and washing the separated silicon tetrafluoride gas and / or silicon tetrafluoride gas generated by a wet-process phosphoric acid process with concentrated sulfuric acid, reacting with water vapor, hydrogen and oxygen, and dedusting to obtain the fumed silica. The method has the advantages of simple process flow, low production cost, high product quality, low three-waste output and the like. Besides, low-grade and low-concentration fluosilicic acid is used as a raw material, fluorine and silicon elements are efficiently separated, high-value fumed silica and high-quality hydrogen fluoride are prepared, and good social and economic values are embodied; and cyclic utilization of byproducts such as sulfuric acid reduces environmental pollution and three-waste treatment pressure, and has good environmental protection benefits.

The invention belongs to the technical field of rare earth secondary resource recycling and reusing, and particularly relates to a short-process method for recycling rare earth in rare earth molten salt slag. According to the method, the rare earth molten salt slag is firstly subjected to crushing and wet grinding treatment, the treated rare earth molten salt slag is roasted to remove fluorine, 99% of fluorine in the rare earth molten salt slag in the roasting process can be recycled to become hydrofluoric acid after being removed, meanwhile, the fluorine-removed rare earth molten salt slag is obtained, and then the rare earth oxide is obtained through the procedures of acid leaching, precipitation and firing. And the rare earth recovery rate is greater than 98%. According to the method provided by the invention, the rare earth and the fluorine in the rare earth molten salt slag can be separated through a simple roasting process under the condition that other materials are not added, the purpose of separating the rare earth from the fluorine is achieved, resource recycling of the rare earth and the fluorine is realized, the technological process is simple, and industrial production is easy.

A degassing tower for preparing hydrogen fluoride relates to the field of hydrogen fluoride preparation, and is characterized in that a cylindrical mesh cage (2) is arranged in the middle of an inner cavity of a tower body (1), an auxiliary assembly (5) is arranged below the cylindrical mesh cage (2), a spraying assembly (3) is arranged above the cylindrical mesh cage (2) in the inner cavity of the tower body (1), and a driving assembly (4) is arranged at the top of the spraying assembly (3); according to the invention, the cylindrical mesh cage which can float and is used for more sufficient contact between the to-be-treated gas and the gathered liquid is arranged in the middle of the tower body, and the spraying assembly used for assisting adsorption of substances except hydrogen fluoride is arranged above the cylindrical mesh cage; the top of the spraying assembly is provided with the driving assembly which is used for rotating the spraying assembly to enable the spraying area of the spraying assembly to be more uniform and providing driving force for the auxiliary assembly, so that non-condensable gases such as sulfur dioxide and silicon tetrafluoride in a hydrogen fluoride gas mixture are removed; and the hydrogen fluoride gas is condensed to obtain a qualified anhydrous hydrogen fluoride product.

The utility model belongs to the technical field of resource recovery, and particularly relates to an efficient fluorine recycling device which comprises a mixing tank, the top of the mixing tank is connected with a feeding pipe and a fluorine overflowing agent tank, a discharging port of the mixing tank is connected with a mixed feed liquid delivery pump, the mixed feed liquid delivery pump is connected with the bottom of an inner jacket of a jacket defluorination reaction kettle, and the inner jacket of the jacket defluorination reaction kettle is connected with a fluorine overflowing agent tank. The top of the jacket defluorination reaction kettle is connected with a feed port of a water circulation cooler, a discharge port of the cooler is connected with a fan, and the fan is connected to the next process; and the outer jacket of the jacket defluorination reaction kettle is connected with a medium-pressure steam pipe. The fluorine recovery device has the beneficial effects that fluorine in fluorine-containing feed liquid is recovered by adopting the device, and the recovery rate is up to more than 85%; the device does not generate other wastes, is green and environment-friendly, and realizes an integrated process of heating and steam stripping.

The invention discloses a method for recovering HF (hydrogen fluoride) from hydrofluoric acid waste liquid obtained in an aromatic fluoride industrial synthesis process. According to the HF recovery method provided by the invention, sodium fluoride is taken as a carrier, excessive sodium fluoride reacts with hydrogen fluoride in the hydrofluoric acid waste liquid to generate sodium bifluoride, and HF is released through suction filtration, drying and thermal liberation. The HF is subjected to adsorption-desorption circulation through NaF, so that the purpose of recycling HF without discharging three wastes is achieved; meanwhile, the filtrate returns to the aromatic fluoride industrial synthesis process to be recycled as an absorbent of diazonium salt pyrolysis tail gas; the obtained sodium fluoride is recycled as an HF adsorbent, so that the effect of recycling multiple resources is achieved.

The utility model discloses a continuous arsenic removal device for anhydrous hydrogen fluoride, which is characterized in that a product tank is connected with a primary rectifying tower, the primary rectifying tower is in pipeline connection with a heat exchanger, the heat exchanger is respectively in pipeline connection with a first finished product tank, a second finished product tank and a third finished product tank, and the first finished product tank, the second finished product tank and the third finished product tank are respectively connected with a secondary rectifying tower; and the secondary rectifying tower is connected with the product tank. According to the utility model, the first finished product tank, the second finished product tank and the third finished product tank are connected with the existing rectifying tower by adding corresponding pipelines at the outlet of the circulating submerged pump for real-time switching use of arsenic removal oxidation, acid feeding and acid discharging, so that continuous arsenic removal production is realized, and the influence on normal production of the device is avoided.

The utility model discloses a sealing device of a hydrogen fluoride reaction furnace, which belongs to the technical field of hydrogen fluoride processing and particularly comprises a hot air jacket and a furnace tail, and a graphite block sealing mechanism is arranged at the joint of the hot air jacket and the furnace tail. The graphite block further comprises an elastic pressing mechanism, the elastic pressing mechanism comprises fixing frames, a longitudinal elastic piece and a transverse elastic piece, the fixing frames are fixedly connected to the hot air jacket, one end of each fixing frame is located above the graphite block body and fixedly connected with the graphite block body, a pressing plate is movably connected between every two adjacent fixing frames, and the longitudinal elastic piece is fixedly connected with the transverse elastic piece. The pressing plate is connected with the two adjacent fixing frames through a longitudinal elastic piece, and the pressing plate is connected with a hot air jacket through a transverse elastic piece; through the arrangement of the transverse elastic piece, elastic force pointing to the section of the hot air jacket can be provided for the graphite block body, and the possibility that gas leaks between the graphite block body and the section of the hot air jacket is further reduced.

The invention provides an anhydrous hydrogen fluoride desulfurization reaction device, and relates to the technical field of anhydrous hydrogen fluoride preparation, the device comprises a reaction container, the reaction container is internally provided with a first accommodating cavity, and the reaction container is provided with a first feed port, a second feed port and a discharge port which are communicated with the first accommodating cavity; wherein the first feeding hole is used for conveying a liquid catalyst for sulfur removal into the first accommodating cavity, and the second feeding hole is used for outputting sulfur-containing hydrogen fluoride gas from the bottom of the first accommodating cavity; and the height of the discharge port is greater than that of the first feed port so as to discharge the sulfur-removed hydrogen fluoride gas. The method can deeply remove sulfur in anhydrous hydrogen fluoride production, and can avoid influence on production continuity and safety.

The utility model relates to the technical field of production capacity of hydrogen fluoride evaporation systems, in particular to hydrogen fluoride evaporation equipment which comprises a shell pass, a tube pass upper tube box and a tube pass lower tube box, the shell pass comprises a shell pass saturated evaporation section and a shell pass superheat section which are communicated, heat exchange tubes are arranged in the shell pass saturated evaporation section and the shell pass superheat section, and the shell pass upper tube box and the shell pass lower tube box are communicated. The tube pass upper tube box and the tube pass lower tube box are communicated through the heat exchange tube; a hydrogen fluoride inlet is formed in the bottom of the shell pass saturation evaporation section; and a hydrogen fluoride gas outlet is formed in the top of the shell pass overheating section. The hydrogen fluoride evaporation tank overcomes the defects of a traditional hydrogen fluoride evaporation tank, provides a safer and more efficient mode to improve the evaporation and supply capacity of hydrogen fluoride, meets the requirements of an existing process, reduces the storage amount of hydrogen fluoride, reduces steam consumption, improves the production efficiency and reduces the safety risk level.

This application discloses a method for extracting fluorine from a nickel-cobalt-manganese sulfate solution, relating to the field of wastewater treatment. The method comprises the following steps: mixing the nickel-cobalt-manganese sulfate solution with concentrated sulfuric acid for activation, subjecting the activated solution to multi-stage countercurrent extraction using an organic phase comprising tributyl phosphate, isooctyl alcohol, and a diluent, subjecting the fluorine-containing organic phase to multi-stage countercurrent washing, and subjecting the washed fluorine-containing organic phase to multi-stage countercurrent stripping. This application, directed to the extraction of fluorine from a nickel-cobalt-manganese sulfate solution, employs tributyl phosphate as an extractant, while isooctyl alcohol is added in a mixing and settling tank to improve phase separation. The process is simple, and the extraction rate is as high as over 90%.

The application discloses a method for recovering fluorine and triethylamine from fluorine-containing organic wastewater, and belongs to the technical field of fluoride preparation. The method adopts the synergistic effect of an organic phase of an extractant A and an extractant B under the condition that the pH is 0.5-4, realizes selective extraction of fluorine ions and inhibition of extraction of metal impurity cations under the premise that water-soluble triethylamine is not extracted through a one-step liquid-liquid extraction process, thereby realizing efficient and low-loss recovery of fluorine and triethylamine, and further preparing high-purity fluorides and triethylamine. The method has the advantages of short process, no need of complicated impurity removal process, high fluorine recovery rate, low production cost and the like.

The utility model provides a crude distillation tower for preparing hydrogen fluoride, which comprises a crude distillation tower I and a crude distillation tower II, and further comprises a fixed shell I, and the fixed shell I is arranged on the upper side and the lower side of the crude distillation tower I and the crude distillation tower II. An electric push rod drives a first push rod and a second push rod to move, the first push rod and the second push rod move a blocking frame to move, blocking and opening of a first coarse distillation tower and a second coarse distillation tower are facilitated, and therefore conversion of coarse distillation working areas between the first coarse distillation tower and the second coarse distillation tower is well carried out; the coarse distillation tower is plugged through the plugging frame and the plugging block, so that the plugging effect of the plugging structure on the coarse distillation tower is better, the coarse distillation tower I and the coarse distillation tower II can be switched between coarse distillation working areas, the coarse distillation work of the whole coarse distillation tower is not influenced while the maintenance work is better and conveniently carried out, and the maintenance efficiency is improved. And the overall working efficiency is improved.

A gas inlet pipeline is arranged at the left lower end of a processing tank, a gas outlet pipeline is arranged at the upper end of the processing tank, the gas outlet pipeline is connected with a gas inlet of a condenser a through a compressor, a non-condensable gas outlet is formed in the right side of the upper end of the condenser a, and a condensate outlet is formed in the lower end of the condenser a. The condensate outlet is externally connected with a collecting tank; the left side of the light component removal tower is communicated with a collecting tank through a feeding hole, the lower part is communicated with a reboiler through a connecting hole, the upper part is connected with a reflux condenser through an exhaust pipeline, a hydrogen fluoride extraction pipeline is arranged below the reboiler, and a gas outlet of the reflux condenser is externally connected with a buffer tank; the pressurized distillation kettle comprises a kettle body and a kettle cover, a discharge pipeline is arranged below the kettle body, a material injection pipeline is arranged between the lower end of the left side surface and the buffer tank, a stirring paddle is rotationally arranged in the center of the kettle cover, a discharge pipeline and a pressurized pipeline are arranged on the right side of the upper end, and the stirring paddle is externally connected with a stirring motor; the utility model has the advantages of reasonable structural design and good use effect.