12 results about "Sodium fluoride product" patented technology

A method for recovering a lithium from a spent cathode of aluminum electrolysis according to an embodiment of the disclosure includes: crushing the spent cathode, then washing and filtering the spent cathode to obtain a first filtrate and a first filter residue, respectively; evaporating and crystallizing the first filtrate to obtain a sodium fluoride product; adding a binder into the first filter residue, and mixing and shaping the first filter residue and the binder, and then calcining and collecting shaped first filter residue to obtain a graphite product and a dust collection powder; lithium-salt leaching the dust collection powder with pure water and filtering to obtain a second filtrate and a second filter residue; washing the second filter residue, and then drying the second filter residue to obtain a cryolite product; and adding the second filtrate into a carbonas solution to perform a lithium precipitation reaction to obtain a lithium carbonas product.

The invention relates to the field of tantalum powder mixed salt utilization, and discloses a method for recycling a byproduct fluorine-chlorine-sodium-potassium-containing mixed salt in tantalum powder production. The method comprises the following steps: (1) leaching fluorine, chlorine, sodium and potassium-containing mixed salt in the presence of a leaching agent to obtain a solid mixture A and a salt solution B; (2) sorting the solid mixture A obtained in the step (1) to obtain a tantalum pentoxide crude product and a sodium fluoride product; (3) reacting the salt solution B obtained in the step (1) with a composite fluorine removal agent to obtain a fluorine-containing solid and a salt solution C; and (4) crystallizing the salt solution C obtained in the step (3) to obtain a potassium chloride product and a salt solution D. The method can realize separation and recovery of valuable elements to the greatest extent.

The invention discloses a resource recycling method for electrolytic aluminum overhaul slag, and relates to the technical field of resource recycling. The recovery method comprises the following steps: crushing the overhaul slag, stirring with water, washing, and separating to obtain water washing liquid and washing slag; washing residues are leached by adopting an acid solution in a synergistic heating manner, cryolite and other substances in the washing residues are efficiently dissolved, and leached residues are mainly carbon materials. And hydrogen fluoride gas generated in the leaching process is introduced into alkaline water washing liquid, aluminum salt is added for impurity removal, and a sodium fluoride product is obtained through evaporative crystallization. And adding ammonia water into the leachate to adjust the pH value, cooling and crystallizing to obtain an aluminum ammonium sulfate product for recovering aluminum. And the separated mother liquor is subjected to impurity removal, alkalization, evaporation and concentration, ammonia gas is recovered, and a lithium-rich concentrated solution is obtained. Extracting lithium from the concentrated solution, and evaporating raffinate to obtain a sodium sulfate product; and the lithium-loaded organic phase is subjected to reverse extraction by phosphoric acid, and a lithium dihydrogen phosphate product is directly obtained after reverse extraction liquid is subjected to pH-controlled evaporation. According to the invention, collaborative recovery and high-value utilization of fluorine, aluminum, sodium and lithium resources are realized.

A method for the resource utilization of potassium chloride and potassium fluoride mixed salts, byproducts of polyfluorinated nitrobenzene (PFN) reactions, belongs to the field of resource utilization of potassium salts byproducts of fluorination reactions. The method is characterized by the following preparation steps: 1) removing organic pollutants from the mixed salts through heat treatment to obtain inorganic mixed salts; 2) dissolving the inorganic mixed salts in a solvent to obtain an inorganic mixed salt solution, evaporating and concentrating the solution, cooling and crystallizing, and filtering to separate primary potassium chloride solid and a mixed filtrate; 3) adding a defluorinating agent to the mixed filtrate to obtain precipitated sodium fluoride product and potassium chloride solution; 4) preparing a potassium chloride solution by dissolving the primary potassium chloride solid in distilled water and performing bipolar membrane electrodialysis to obtain a dilute KOH solution; 5) concentrating the KOH solution and then introducing HF gas to prepare potassium fluoride. This invention obtains sodium fluoride, potassium fluoride, and potassium chloride products through salt separation technology and bipolar membrane electrodialysis technology, realizing the separation, purification, and recycling of potassium and fluorine resources.

The spherical sodium fluoride seed crystal is prepared under the action of the crystallization aid; in the preparation process of the sodium fluoride, the sodium fluoride can be uniformly crystallized and grown on the surface of the spherical seed crystal, and adhesion of silicon dioxide and sodium fluosilicate particles on the seed crystal is hindered, so that the phenomenon that the sodium fluoride is coated with silicon dioxide and sodium fluosilicate is avoided, the content of impurity silicon in a sodium fluoride product is reduced, and the purity of the sodium fluoride is improved.

This invention relates to the field of chemical production technology, and particularly to a continuous recovery system for fluorinated silicon slag. The continuous reaction module, from front to back, includes a preliminary digestion device, a multi-stage reaction device, and a circulating sedimentation device. The preliminary digestion device is used to hydrothermally treat the fluorinated silicon slag with sodium carbonate to obtain a mixed solution. The multi-stage reaction device is located at the rear of the preliminary digestion device and has multiple overflow chambers, ultimately generating overflow liquid and sodium fluoride solid phase. The circulating sedimentation device is located at the rear of the multi-stage reaction device to receive the overflow liquid from the multi-stage reaction device. A filtration module is located at the slag outlets of both the multi-stage reaction device and the circulating sedimentation device to filter and separate the solid phases discharged from both devices. The continuous recovery system for fluorinated silicon slag provided by this invention converts fluorinated silicon slag into high-value-added silica and sodium fluoride products, achieving dual recovery of silicon and fluorine resources, and has significant industrial value.

The invention belongs to the field of chemical technology, and specifically relates to a method for recovering sodium fluoride from waste solids generated by the production of hexafluoroacetone. The method for recovering sodium fluoride from waste solids generated by the production of hexafluoroacetone can efficiently recover and utilize the fluorine element in the waste solids, and the obtained sodium fluoride product meets the industry standard YS / T517-2009. The method does not require an organic solvent, does not generate waste liquid, is simple to operate, has low cost, is easy to realize large-scale industrial production, and has great environmental and economic significance.

The invention provides a fluorine-containing waste acid resourceful treatment method, which is applied to the technical field of waste acid resourceful recovery, and specifically comprises the following steps: S1, adding a sodium source into fluorine-containing waste acid, fully reacting, and adjusting the pH value of the solution to 6-7; s2, carrying out heat preservation and aging on the adjusted solution in a continuous stirring state, and carrying out solid-liquid separation on the obtained turbid liquid to obtain a first solid matter and a primary mother solution; s3, collecting and drying the first solid matter to obtain a sodium fluoride product, adding a calcium source into the primary mother liquor, and performing solid-liquid separation after full reaction to obtain a second solid matter and secondary mother liquor; s4, collecting and drying the second solid matter to obtain a calcium fluoride product, and evaporating and concentrating the secondary mother liquor to obtain sodium nitrate crystals and distillate water; and S5, mixing the residual mother liquor after evaporation and concentration with the fluorine-containing waste acid raw material, and reusing. By adopting the method, the total recycling of most anions in the waste acid solution can be realized.

The invention relates to the technical field of sodium fluoride preparation devices, in particular to a preparation device and process of an optical-grade sodium fluoride product, and the preparation device comprises a first guide transmission structure, a production processing structure, a toothed belt and a second guide transmission structure, the front end of the first guide transmission structure is communicated with the production processing structure; the side end of the second guide conveying structure communicates with the production treatment structure, the first guide conveying structure comprises a first communication control pipe, a butt joint guide base, a protective top disc, a first motor, a first protective base, a first sealing disc base and a first butt joint guide discharging pipe, and the lower end of the first communication control pipe communicates with the first sealing disc base through the butt joint guide base; the upper end of the first sealing disc seat is sealed through a protective top disc, and a first motor is installed at the upper end of the protective top disc. And through the arrangement of the first guide transmission structure, the production treatment structure and the second guide transmission structure, the preparation work of sodium fluoride is facilitated.

The invention relates to a method for preparing sodium fluoride based on precipitated hydrated white carbon black waste liquid. The method comprises the following steps: step 1, treating waste liquid; step 2, primary filtration; step 3, precisely filtering; step 4, concentrating and thickening; step 5, centrifugal separation; and step 6, drying and packaging. According to the method, the waste liquid for producing the precipitated active hydrated white carbon black is fully utilized, waste is turned into wealth by physical and chemical methods through the processes of flocculation modification, filtration and impurity removal, concentration, crystallization, centrifugal filtration, flash drying, packaging and the like, a sodium fluoride product with relatively high purity is produced, and meanwhile, silicon dioxide filter residues obtained by filtration can also be used as a defluorination agent.

The invention provides a method for preparing sodium fluoride from calcium fluoride sludge, and belongs to the technical field of recycling of fluorine resources in fluorine-containing solid waste. Comprising the following steps: S1, mixing pretreated calcium fluoride sludge with concentrated sulfuric acid in a corrosion-resistant reactor, and carrying out a thermochemical conversion reaction to generate hydrogen fluoride and carbon dioxide mixed gas and solid residues; s2, hydrogen fluoride gas generated in the reaction in the step S1 is captured and absorbed, a sodium fluoride product is obtained, and tail gas containing carbon dioxide is generated in the absorption process; s3, collecting and treating carbon dioxide-containing tail gas generated in the reaction process to obtain a sodium carbonate solution, and further separating out a sodium carbonate solid by cooling; and S4, carrying out post-treatment on solid residues after the reaction in the step S1 to obtain a solid by-product. According to the method, the fluorine element in the fluorine-containing sludge is efficiently recycled, meanwhile, residues are converted into building materials with utilization value, and harmlessness and recycling of the fluorine-containing sludge are achieved.

This invention relates to the field of fluorinated silica gel utilization, and in particular to a high-yield method for fluorine recovery from fluorinated silica gel, comprising the following steps: adding fluorinated silica gel byproducts to an alkaline solution in a specified proportion, heating and stirring to react; after the reaction is complete, cooling the solution to room temperature, adding sodium salt for salting out; filtering, the filtrate being a high-modulus water glass product; the filter cake, after washing and drying, being a high-purity sodium fluoride product. This invention uses a simple and feasible operation to effectively recover and harmlessly treat fluorine resources from fluorinated silica gel, recovering fluorine elements for use in the preparation of high-purity sodium fluoride, while simultaneously producing high-modulus water glass. This avoids the large-scale landfilling of fluorinated silica gel slag, reduces environmental pollution, and creates industrial value.