41results about "Ammonium fluoride" patented technology

The invention discloses a device and a method for co-producing ammonium chloride by recycling rare earth wastewater. The device for co-producing ammonium chloride by recycling rare earth wastewater comprises an air floatation tank, an inclined plate sedimentation tank, filtering equipment, disc tube type reverse osmosis equipment, a high-density sedimentation tank, a first sand filter, an MVR (mechanical vapor recompression) evaporator, a triple-effect evaporator and reverse osmosis equipment. The method for recycling the rare earth wastewater and co-producing the ammonium chloride is carried out by adopting the device. According to the method, two ammonium chloride products can be produced at low cost and low energy consumption, and cyclic utilization of the rare earth wastewater is realized.

The invention provides a method for treating waste water containing fluorine and aluminum, which comprises the following steps: S1, first treatment: reacting a first mixed solution, and carrying out solid-liquid separation to obtain a first treated solution and first treated slag; wherein the first mixed solution comprises waste water containing fluorine and aluminum and ammonia water, and the pH value of the first mixed solution is 7-8; s2, second treatment, wherein the second treatment comprises the steps S2'and S2 ''; s2 ', the first treatment slag and a hydrofluoric acid solution are mixed for acid dissolution, and an acid solution is obtained; mixing an acid solution and sodium fluoride, and carrying out precipitation treatment to obtain cryolite; s2 '', mixing the first treatment liquid with calcium chloride, performing defluorination treatment, and performing solid-liquid separation to obtain calcium fluoride and defluorination waste liquid. By the treatment method, cryolite with high yield and high purity can be prepared, and meanwhile, the low-aluminum and low-fluorine discharge requirements can be met.

The invention belongs to the technical field of chemical production, and particularly discloses a preparation method of high-purity silicon dioxide, which comprises the following steps: S1, grinding: crushing and grinding minerals or waste residues containing silicon dioxide or silicate; s2, leaching: mixing with a leaching agent according to a ratio, carrying out a leaching reaction, and carrying out solid-liquid separation to obtain a fluorine ion complex solution containing fluosilicic acid; s3, extraction: separating fluosilicic acid from fluorine ion complex impurities by adopting an extraction method to obtain a high-purity fluosilicic acid or fluosilicate solution; s4, pH adjustment: carrying out a double decomposition reaction by adjusting the pH, and carrying out solid-liquid separation to obtain a silicic acid solid and soluble fluoride; and S5, obtaining high-purity silicon dioxide. The preparation method of the high-purity silicon dioxide is suitable for most silicon-containing raw materials, the content of impurities in the silicon slag is effectively reduced, and the purity of the prepared high-purity silicon dioxide can reach 99.99%.

The invention relates to a multi-effect evaporation process and device for preparing ammonium bifluoride from waste HF acid. Comprising the following steps: performing a falling film absorption process on HF-containing gas in cathode tail gas of a nitrogen trifluoride electrolytic cell to obtain a hydrofluoric acid solution; adding liquid ammonia into the hydrofluoric acid solution, and reacting to obtain an ammonium bifluoride solution; heating the ammonium bifluoride solution and the centrifuged mother liquor to obtain mixed mother liquor; carrying out heating reduced pressure distillation on the mixed mother liquor, and then carrying out primary cooling to obtain ammonium bifluoride crystal mush; secondary steam generated in the evaporation process can be pressurized and then heated to heat the ammonium bifluoride solution; performing centrifugal separation on the ammonium bifluoride crystal slurry to obtain ammonium bifluoride solid, and recycling mother liquor; according to the method, the problem that the additional value is low when hydrofluoric acid serves as a by-product is solved, a complete heat energy cycle is established through the steam compressor, and high-quality ammonium bifluoride is produced with low energy consumption and high efficiency.

The invention relates to a method for green recovery of lithium and fluorine in lithium-rich aluminum slag and preparation of battery-grade lithium dihydrogen phosphate and electronic-grade ammonium fluoride, and belongs to the technical field of comprehensive utilization of mineral resources. The method comprises the following steps: crushing and levigating lithium-rich aluminum slag obtained by electrolytic aluminum, adding deionized water, and then carrying out wet ball milling to obtain lithium-rich aluminum slag slurry; adding the lithium-rich aluminum slag slurry into a eutectic solvent for leaching, and carrying out suction filtration to obtain a leaching solution and insoluble slag; slowly dropwise adding ammonia water into the leachate, and filtering to obtain a neutralized solution and a precipitate; injecting the neutralization solution into a selective ion exchange column to obtain selective exchange resin enriched with lithium ions and ion exchange effluent; and eluting the lithium-rich resin with an H2C2O4 solution and preparing battery-grade lithium dihydrogen phosphate, and preparing electronic-grade ammonium fluoride from ion exchange effluent. According to the method, the production cost is effectively reduced through the modes of optimizing the process, reducing the energy consumption and the like, and maximization of economic benefits is achieved while the product competitiveness is improved.

This invention provides a method for producing high-purity aluminum-niobium-tantalum master alloys and co-producing ammonium fluoride, belonging to the fields of metallic materials and inorganic chemicals. The invention involves mixing fluoroniobic acid, fluorotantalic acid, and ammonia water for a precipitation reaction to obtain a precipitate and an ammonium fluoride solution. The ammonium fluoride solution is then concentrated, cooled for crystallization, dehydrated, and dried sequentially to obtain ammonium fluoride. The precipitate is then dried and oxidized and calcined sequentially to obtain an oxide. The oxide, aluminum powder, potassium chlorate, and calcium fluoride are mixed and subjected to a vacuum aluminothermic reaction to obtain the high-purity aluminum-niobium-tantalum master alloy. This invention, considering both broadening the range of raw material selection and optimizing the production process, reacts fluoroniobic acid, fluorotantalic acid, and ammonia water to produce niobium hydroxide and tantalum hydroxide precipitates, which are then oxidized and calcined to form niobium and tantalum oxides. The high-purity aluminum-niobium-tantalum alloy is then prepared using a vacuum aluminothermic reaction. Simultaneously, ammonium fluoride can be co-produced, resulting in high raw material utilization.

The invention discloses a method for recovering ammonium fluoride from semiconductor photovoltaic wastewater. The method comprises the following steps: adjusting pH in a pretreatment stage, and adding sodium citrate to complex metal ions; a composite extraction agent composed of diisooctyl phosphate, trialkyl phosphine oxide and methyl trioctyl ammonium chloride is adopted for multi-stage counter-current extraction; sequentially carrying out washing and two-stage gradient ammonia water reverse extraction to improve the selectivity and inhibit silicon-boron co-dissolution; the strip liquor is subjected to calcium and magnesium salt impurity removal, reduced pressure evaporation, graded cooling crystallization and vacuum drying, an ammonium fluoride product with the purity larger than or equal to 94% and the water content smaller than or equal to 0.5% is finally obtained, the extracting agent can be recycled, mother liquor and washing liquor are recycled, and the process is closed, environmentally friendly, economical and suitable for industrial application.

The present application relates to a kind of fluorine ammonium salt solution impurity removal method, fluorine ammonium salt preparation method, belong to fluorine chemical technology field.The fluorine ammonium salt solution impurity removal method of the present application, first fluorine ammonium salt solution and fluorine silicic acid solution are mixed, the mixed solution with pH 2~3 is obtained, then lead compound and mixed solution are mixed, lead compound produces lead ion in liquid environment, and then lead ion and phosphate ion and sulfate ion in mixed solution occur precipitation reaction, then excess lead ion is removed using lead adsorbent, finally solid-liquid separation is carried out, and impurity removal liquid is obtained.The fluorine ammonium salt solution impurity removal method of the present application is simple to operate, can efficiently remove phosphate ion and sulfate ion in fluorine ammonium salt solution and / or fluorine silicic acid solution, without introducing other impurity ions.

The invention firstly relates to a method for respectively extracting and producing uranium and, where appropriate, heavy metals and rare earths from phosphato-calcium mineral matrices comprising the steps of a) treatment of said phosphato-calcium mineral matrices with a source of fluoride anions; b) heat treatment of said mixture of fluorides in the presence of calcium metal; and c) separation followed by the individual collection of uranium metal and, where appropriate, of heavy metals and rare earths initially present in the starting material. The invention also relates to a series of methods derived from the implementation of the aforementioned and leading, depending on the pathways followed, to the production, respectively, of phosphoric acid, sulfuric acid, ammonium sulfate or NPK fertilizers and more particularly, respectively, of phosphoric acid, sulfuric acid, ammonium sulfate or NPK fertilizers free of metal contaminants. The invention is defined in the claims. Other objectives of the invention will become apparent over the course of the following description, in particular with reference to the reaction schemes illustrated by the figures below.

The invention provides a method for preparing trifluoromethanesulfonamide, which comprises the following operation steps: S1, adding an acetone solvent into a reactor, and starting stirring; s2, cooling liquid is introduced into the reactor jacket, and the reactor is cooled; s3, introducing trifluoromethanesulfonyl fluoride gas into the reactor; s4, introducing ammonia gas into the reactor, controlling the temperature, and reacting while introducing gas; s5, discharging the materials in the reactor, and filtering; and S6, introducing the filtered solution into a distillation kettle, and recovering the acetone solvent under reduced pressure to obtain a product. The method for preparing trifluoromethanesulfonamide comprises the following steps: reacting trifluoromethanesulfonyl fluoride and ammonia gas in the presence of acetone serving as a solvent, filtering, and carrying out reduced pressure distillation to obtain trifluoromethanesulfonamide with the purity of 99.99%. The method is simple in process, the yield can reach 95% or above, and large-scale production and application are easy to achieve.

Disclosed herein are fluoride-containing ammonium salts and methods of production and uses thereof. For example, methods of producing ammonium fluoride by combining a material comprising a fluorosilicate with an amine are disclosed. In some examples, the material comprising a fluorosilicate comprises a waste product, such as a waste product from ore processing (e.g., phosphate ore processing), fertilizer production, and / or aluminum production and / or refinement.

The invention provides a multi-stage condensation recovery and closed-loop fluorinating agent regeneration process. The process comprises the following steps: introducing ammonia gas, ammonium fluoride and hydrogen fluoride volatilized from a titanium-containing compound in fluorination, sublimation and hydrolysis processes into a condensing tower; the condensing tower is used for recovering ammonium bifluoride residues in a first condensing stage, collecting ammonium fluoride and hydrogen fluoride in a second condensing stage and condensing ammonia gas in a third condensing stage; introducing the condensed ammonia gas and ammonium fluoride into an absorption tower, absorbing with a hydrofluoric acid solution, and reacting to generate an ammonium bifluoride solution; and the ammonium bifluoride solution is regenerated into solid ammonium bifluoride through vacuum evaporative crystallization.

The present invention provides a device for preparing high-purity ammonium chloride by evaporating low-concentration ammonia water by utilizing waste heat, comprising a waste heat recovery box, a reactor, and a separation and purification component, wherein the waste heat recovery box is provided with an air inlet and a first air outlet, the interior of the reactor is provided with a mixing chamber and a heating chamber, the first air outlet is connected to the heating chamber through a first air outlet pipe, the top of the heating chamber is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe, a heat energy recovery area and a heat energy exchange area are provided inside the waste heat recovery box, the heat energy recovery area is connected to the air inlet through the air inlet pipe, an end of the air inlet pipe away from the air inlet is connected to a chemical equipment with waste heat, and the heat energy exchange area is tightly fitted with the heat energy recovery area; the separation and purification component comprises an evaporator, a crystallizer, and a purifier, the discharge end of the evaporator is connected to the crystallizer, and the discharge end of the crystallizer is connected to the purifier. Through this design, the utilization of waste heat resources can be maximized and resource waste can be avoided.

The invention discloses an electrolyte slag treatment method which comprises the following steps: pretreatment: grinding electrolyte slag into powder, and then carrying out combustion treatment to obtain residual slag; mixing: grinding the residues into powder, adding the treated medicine powder, and uniformly mixing to obtain mixed powder; heating reaction: heating the mixed powder, collecting generated tail gas, adding water for dissolving after the reaction is finished, and filtering to obtain aluminum-containing precipitate; the treatment powder is acidic powder and contains ammonium ions. The electrolyte slag treatment method provided by the invention has the effects of high treatment efficiency, low cost and simplicity and convenience in operation.

This invention provides an integrated process for processing ammonium fluorosulfate, a by-product generated in the production of bis(fluorosulfonyl)imides. [Solution] A process for processing ammonium fluorosulfate byproducts includes providing an ammonium fluorosulfate byproduct mainly comprising ammonium fluorosulfate and smaller amounts of fluorosulfonic acid and bis(fluorosulfonyl)imide; mixing the ammonium fluorosulfate byproduct with water; reacting the mixture of ammonium fluorosulfate byproducts and water at a hydrolysis reaction temperature to hydrolyze ammonium fluorosulfate, fluorosulfonic acid and bis(fluorosulfonyl)imide to form ammonium bicarbonate and an aqueous hydrogen fluoride solution; and separating ammonium bicarbonate from the aqueous hydrogen fluoride solution.

The present invention belongs to the technical field of aluminum electrolysis hazardous waste treatment, and specifically relates to a method for recovering carbonaceous materials from carbon-containing waste in aluminum electrolysis. The high-temperature ball milling device is used to assist in recovering the carbonaceous materials contained in the carbon-containing hazardous waste in aluminum electrolysis. The mixing treatment, high-temperature activation roasting, and high-pressure activation leaching are all carried out in the high-temperature mechanical activation device. By constructing an oxidation-fluorination roasting system and an HF-HCl / H2SO4 / HNO3 mixed acid purification system, on the one hand, the safe dissociation of cyanide / fluorine toxic substances can be achieved, and on the other hand, the effective separation of complex and poorly soluble aluminosilicates can be realized. The fixed carbon content of the recovered carbonaceous materials is ≥99.0%. On the other hand, in view of the physical and chemical properties of the roasting flue gas and the acid leaching waste liquid, the treatment processes such as pH value regulation, seed addition, and cooling crystallization are innovatively coupled to realize the recycling of solid reaction reagents, with a recovery rate of ≥85% and no risk of secondary pollution.

The invention provides a cyclic treatment process of tantalum-niobium wet smelting alkaline wastewater, and belongs to the technical field of tantalum-niobium wet smelting wastewater treatment.The low-fluorine pure water and ammonia-containing recycled water used in the treatment process are recycled wastewater of the tantalum-niobium wet smelting alkaline wastewater; the alkaline wastewater is recycled to the maximum extent, and the water consumption of new water in the alkaline wastewater treatment process can be greatly reduced; in the whole treatment process of the process, a small amount of chemically pure hydrofluoric acid is added, other chemical substances are not additionally added, no waste residues are discharged, the operation cost is remarkably reduced, the high-purity and high-value ammonium fluoride product can be produced, and the purity of the ammonium fluoride product can reach 98% or above. According to the treatment process disclosed by the invention, fluorine and ammonia in the wastewater can be effectively recycled through resource treatment, zero discharge of the tantalum-niobium wet smelting alkaline wastewater is basically realized, and the treated low-fluorine pure water meets first-grade standard requirements of a table 1 and a table 4 in Integrated Wastewater Discharge Standard (GB 8978-1996). According to the treatment process disclosed by the invention, the condensate water and the reuse water subjected to the multi-stage membrane concentration treatment are subjected to quality and retention treatment for reuse according to different ammonia nitrogen concentrations in the condensate water and the reuse water subjected to the multi-stage membrane concentration treatment, so that the dosage of ammonia and hydrofluoric acid can be greatly reduced, and the production cost is remarkably reduced.

The present application relates to a kind of removal methods of phosphate in fluorine salt solution, belong to fluoride dephosphorization technical field.The removal method of phosphate in fluorine salt solution of the present application, it includes the following steps: mixing in fluorine salt solution metal Zn and / or Zn-containing compound is reacted, after reaction, if system pH is 5.0~8.0, then the system is carried out solid-liquid separation, if system pH <5.0 or >8.0, then add pH regulator to adjust the pH of system to 5.0~8.0 to carry out reaction, then carry out solid-liquid separation;The fluorine salt is ammonium hydrogen fluoride and / or ammonium fluoride, and the pH value of the fluorine salt solution is <5.0 or >8.0.The removal method of phosphate in fluorine salt solution of the present application, while removing phosphate, does not reduce the content of fluoride ion in fluorine salt solution, and the dephosphorization effect is good.

The present invention relates to a method for comprehensive utilization of sulfur dioxide tail gas, comprising the following steps: 1) adding excessive fluorine gas to the tail gas containing sulfur dioxide for reaction to obtain a mixed gas containing sulfuryl fluoride; 2) adding excessive ammonia gas to the mixed gas for reaction to obtain a mixture, and performing gas, solid, and liquid three-phase separation on the mixture to respectively obtain solid ammonium fluoride, liquid bis(fluorosulfonyl)imide, and residual tail gas, and the residual tail gas is absorbed by acid solution and discharged up to the standard. In the present invention, harmful impurities in the hydrogen fluoride process tail gas are removed and all converted into reusable resources, without generating waste gas or waste residue; the treatment process is simple and easy to implement industrially.

This invention belongs to the field of chemical production technology, specifically disclosing a method for preparing high-purity silica, comprising the following steps: S1, grinding: crushing and grinding minerals or waste containing silica or silicates; S2, leaching: mixing with a leaching agent in a certain proportion to carry out a leaching reaction, followed by solid-liquid separation to obtain a fluoride ion complex solution containing fluorosilicic acid; S3, extraction: separating fluorosilicic acid from fluoride ion complex impurities using an extraction method to obtain a high-purity fluorosilicic acid or fluorosilicate solution; S4, pH adjustment: performing a metathesis reaction by adjusting the pH, followed by solid-liquid separation to obtain solid silica and soluble fluorides; S5, obtaining high-purity silica. This invention, employing the above-mentioned method for preparing high-purity silica, is applicable to most silicon-containing raw materials, effectively reducing the impurity content in silicon slag, and preparing high-purity silica with a purity of up to 99.99%.

The invention relates to a waste power battery black powder in-situ pyrolysis PVDF (Polyvinylidene Fluoride) fluorine fixation method, which comprises the following steps: performing pyrolysis treatment on waste power battery black powder in a mixed atmosphere of ammonia gas and oxygen; gas generated in the pyrolysis treatment process is absorbed, and fluorine fixation is achieved; the temperature of the pyrolysis treatment is 260 DEG C to 350 DEG C. According to the method provided by the invention, the mixed gas of ammonia gas and oxygen is used, so that the pyrolysis treatment temperature can be effectively reduced to 260-350 DEG C, and the energy consumption is reduced; the ammonia gas can be combined with HF generated by pyrolysis treatment to generate NH4F, so that the purpose of fixing fluorine is achieved; the produced NH4F has high industrial utilization value, and the economical efficiency of fluorine fixation is improved.

The invention provides a method for preparing white carbon black with a high specific surface area from fluorosilicone raw materials, and belongs to the technical field of chemical product preparation. The preparation method of the white carbon black with the high specific surface area comprises the following steps: adding a dispersing agent into a fluorosilicone raw material, reacting with ammonia water, always keeping the pH value of the system at 9.3-9.4 in the reaction process, carrying out solid-liquid separation after the reaction, drying the solid to obtain the white carbon black with the high specific surface area, and concentrating and drying the filtrate to obtain an ammonium fluoride product. The specific surface area of the prepared white carbon black is greater than 300 m < 2 > / g, and the oil absorption value is gt; the concentration of F <-> is less than 50 ppm, and the yield of the obtained ammonium fluoride is greater than 95%. The preparation method is low in raw material cost, simple and environment-friendly in process and suitable for industrial production.

The invention relates to a treatment method and device system for recycling nickel from nitrogen trifluoride electrolysis waste residues. The device system comprises an electrolytic bath stirring device, a conveying device, a first centrifugal device, a first drying device, a smelting device, a tail gas treatment device and an electrolyte recycling unit. The device system provided by the invention is simple in structure and convenient to operate, can run safely and stably, can recover ammonium bifluoride and crude nickel ingots with the nickel content of 95 wt% or above from the electrolytic bath waste residues, reduces pollutant discharge, greatly reduces the production cost, and has remarkable economic benefits and environmental benefits.

The present invention discloses an apparatus and method for recycling rare earth wastewater and co-producing ammonium chloride. The apparatus comprises a flotation tank, an inclined plate sedimentation tank, a filtration device, a disc-tube reverse osmosis device, a high-density sedimentation tank, a first sand filter, an MVR evaporator, a triple-effect evaporator, and a reverse osmosis device. The method for recycling rare earth wastewater and co-producing ammonium chloride utilizes the aforementioned apparatus. The present invention can produce two ammonium chloride products at low cost and low energy consumption, and achieves the recycling of rare earth wastewater.

The invention discloses a preparation method of potassium bicarbonate, and belongs to the technical field of chemical raw material preparation. A preparation method of potassium bicarbonate comprises the following steps: mixing a water phase and an extraction agent, adding potassium chloride, uniformly mixing, introducing carbon dioxide gas, and stirring for reaction; crystallizing to obtain crystallized potassium bicarbonate and a mixed phase liquid, and standing the mixed phase liquid 1 for phase splitting; washing and separating the solid potassium bicarbonate with water, pre-melting the material with water, heating and cooking, and crystallizing a barren solution to obtain a finished product potassium bicarbonate; ammonium chloride is added into the ammonia water mother liquor to enable the mother liquor to be saturated, then the mother liquor is mixed with a solvent, liquid ammonia is introduced, the reaction is closed and stirred, crystallized solid ammonium chloride and mixed-phase liquid 2 are obtained, and the mixed-phase liquid 2 is subjected to standing layering; and adding ammonia mother liquor and the water pre-melting material into solid ammonium chloride, and concentrating and crystallizing the cooked solution to obtain the finished product ammonium chloride. The problems of low generation rate, high energy consumption, difficulty in solvent recovery and difficulty in application and popularization are solved.

A process for treating an ammonium fluorosulfate byproduct includes providing an ammonium fluorosulfate byproduct including primarily ammonium fluorosulfate and lesser amounts of fluorosulfonic acid and bis(fluorosulfonyl) imide, mixing the ammonium fluorosulfate byproduct with water, reacting the mixture of the ammonium fluorosulfate byproduct and the water at a hydrolysis reaction temperature to hydrolyze the ammonium fluorosulfate, the fluorosulfonic acid and the bis(fluorosulfonyl) imide to form ammonium bisulfate and aqueous hydrogen fluoride; and separating the ammonium bisulfate from the aqueous hydrogen fluoride.

The present application relates to a kind of phosphorus removal in system when fluorosilicic acid is used to prepare fluorinated salt, belong to inorganic fluoride preparation technical field.The present application removes phosphorus in system when fluorosilicic acid is used to prepare fluorinated salt, first the solution containing ferrous fluorosilicate and fluorosilicic acid is ammoniated, obtain the ammoniated treatment liquid with pH 1.5~3, can avoid the precipitation of silicon dioxide when ammoniated and subsequent ammoniated treatment liquid and oxidant mixed reaction, then ammoniated treatment liquid and oxidant are mixed, divalent iron in ammoniated treatment liquid is oxidized into trivalent iron and reacts with phosphorus to generate iron phosphate precipitate, finally through solid-liquid separation, iron phosphate precipitate is dried and can be sold as iron phosphate product.The present application removes phosphorus in system when fluorosilicic acid is used to prepare fluorinated salt under the premise of not introducing impurity ion, can make each element in system be utilized to maximum limit, and wide application range.

The invention belongs to the technical field of batteries, and particularly relates to a method for regulating and controlling reconstruction of spinel on the surface of a lithium-rich manganese oxide positive electrode material and application. The chemical formula of the lithium-rich manganese oxide positive electrode material is Li1. 2Ni0. 132Co0. 172Mn0. 492 O2. The preparation method comprises the following steps: firstly, mixing lithium acetate dihydrate, nickel acetate tetrahydrate, cobalt acetate tetrahydrate, manganese acetate tetrahydrate, ammonium fluoride and citric acid monohydrate, adding the mixture into deionized water to prepare a precursor solution, and then preparing the ammonium fluoride modified lithium-rich manganese-based positive electrode material in one step by utilizing a spray drying method. The original structure is not damaged, the peak of (003) moves towards the low-angle direction, the interlayer spacing of the crystal face of (003) is enlarged, meanwhile, the particle size can be reduced, the content of specific spinel on the surface can be regulated and controlled, and lithium ion transportation is facilitated. The first discharge specific capacity of the lithium-rich manganese oxide positive electrode material prepared by the method is up to 289.77 mAh / g under the current density of 20 mA / g, and the capacity retention rate is up to 81.84% after 300 cycles under the current density of 200 mA / g.

The application discloses a resource utilization method of fluorinated aluminum silicon slag. The resource utilization method comprises the following steps: adding the fluorinated aluminum silicon slag into an alkali solution to react, and then performing solid-liquid separation to obtain a solid and a liquid; the solid is recycled; the pH of the liquid is adjusted to 1.5-3.0 to obtain a fluorosilicate solution; ammonia water and a template agent are added into the fluorosilicate solution to obtain a silica sol; a fluorotitanate solution is prepared and added into the silica sol to obtain a precursor solution; after static crystallization of the precursor solution, solid-liquid separation is performed; the obtained solid is stirred in water overnight, and then suction filtration is performed to obtain a liquid phase and a solid phase; after water removal, the liquid phase is used to prepare ammonium fluoride; the solid phase is dried to obtain a precursor; and the precursor is calcined to obtain TS-1 molecular sieve. The application uses the fluorinated aluminum silicon slag as a silicon source, uses various different fluorotitanate as a titanium source, and combines a template agent to synthesize the TS-1 molecular sieve, and meanwhile, the fluorinated aluminum and the ammonium fluoride can be recycled, thereby providing a new idea for processing of industrial fluorosilicic acid by-products.

The invention relates to the technical field of wastewater treatment and resource recycling, in particular to a process for removing ammonia nitrogen and synchronously recycling ammonium fluoride by a circulating air stripping method. Comprising the following steps: adjusting the pH value of the ammonia-nitrogen-containing wastewater to 11.5-13.0 to obtain alkaline wastewater; the method comprises the following steps: introducing the alkaline wastewater into an ammonia nitrogen stripping tower, and stripping by taking air as carrier gas, so that ammonia nitrogen in the wastewater is converted into gaseous ammonia; the stripped waste gas enters an ammonia gas absorption tower and is sprayed and absorbed by adopting a hydrofluoric acid solution with the concentration of 5-15% to generate an ammonium fluoride solution; tail gas discharged by the ammonia gas absorption tower enters an acid mist absorption tower, and a potassium hydroxide solution is adopted to spray and absorb residual hydrofluoric acid to generate a potassium fluoride solution; and adjusting the pH value of the stripped wastewater to 6-9, and discharging the wastewater after reaching the standard. The invention provides a circulating stripping process system integrating efficient removal of ammonia nitrogen, synchronous recovery of fluorine resources and deep purification of wastewater, and synergistic interaction of pollution treatment and recycling is realized through directional conversion of gaseous ammonia and cooperative control of acid mist.