8 results about "Sodium bifluoride" patented technology

The present invention relates to the field of sodium ion battery technology and provides sodium tetrafluoroborate, a preparation method, and applications thereof. The method comprises the following steps: introducing a gas into a sodium bifluoride solution, mixing, and concentrating the solution to obtain the sodium tetrafluoroborate. The method utilizes a one-step method to synthesize the sodium tetrafluoroborate, which is low-cost, simple, fast, and thorough, shortening the process time. No water is produced as a by-product, and the product yield reaches 92.2%. The resulting sodium tetrafluoroborate has a purity of 99.9%.

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 invention provides an AG glass etching method and equipment thereof, and relates to the technical field of glass etching. A sodium hydrogenfluoride solution is stored in the etching pool, a motor is fixedly mounted outside the etching pool, a driving chain wheel is arranged on a driving shaft of the motor, and a short chain is connected outside the driving chain wheel; a transmission shaft is connected outside the etching pool, a driven chain wheel is arranged at the end of the transmission shaft, and the driving chain wheel is in transmission connection with the driven chain wheel through a short chain. Two long chains are connected to the exterior of the transmission shaft, and two rotating frames are symmetrically mounted in the etching pool. When AG glass at one station is subjected to soaking etching operation, feeding and discharging operation can be carried out on AG glass at the other station, etching treatment can be carried out on the AG glass continuously, and the etching treatment efficiency of the AG glass is greatly improved. The problems that in the actual application scene of existing AG glass etching processing equipment, time consumed in the feeding and discharging links is long, the proportion is large, and the production efficiency of AG glass etching is greatly restricted are solved.

The application discloses a preparation method of sodium tetrafluoroborate and an electrolyte, and the preparation method comprises the following steps: S1, preparation of an ionic raw material solution: mixing a boron source compound and a sodium source compound according to a stoichiometric ratio to obtain a raw material mixture, and dissolving the raw material mixture to form the ionic raw material solution; S2, preparation of sodium tetrafluoroborate crude product: performing a hydrothermal reaction on the ionic raw material solution obtained in the step S1, crystallizing, and vacuum drying to obtain the sodium tetrafluoroborate crude product; S3, purification of sodium tetrafluoroborate: dissolving and filtering the sodium tetrafluoroborate crude product obtained in the step S2, and crystallizing to obtain the final sodium tetrafluoroborate; and the sodium source compound is sodium fluoride and / or sodium hydrogen fluoride. The preparation method of the sodium tetrafluoroborate has the characteristics of low safety risk, green environmental protection, high product yield and strong process operability.

The application provides a method for preparing sodium hexafluorophosphate for sodium batteries from sodium bifluoride, which comprises the following steps: taking electronic-grade sodium hydroxide and electronic-grade hydrofluoric acid as raw materials to generate an intermediate product sodium fluoride, and then reacting the intermediate product with phosphorus pentafluoride to obtain high-purity sodium hexafluorophosphate for sodium batteries. The particle size distribution and yield of sodium fluoride crystals are controlled by adjusting the stirring rate and cooling conditions, and then the purity and yield of sodium hexafluorophosphate are controlled, so that the purity of the finally obtained sodium hexafluorophosphate can reach more than 99.8%, the yield can reach more than 85%, the sodium hexafluorophosphate has the advantages of low cost and high yield, and is beneficial to industrialized production.

The application relates to a preparation method of sodium bisfluorosulfonimide, which comprises the following steps: carrying out fluorination reaction on bischlorosulfonimide acid and sodium fluoride in a weak polar solvent under microwave-induced catalysis to generate sodium bisfluorosulfonimide, wherein the weak polar solvent is an ester solvent. In the application, sodium fluoride is used as a fluorination reagent and a sodium reagent, bischlorosulfonimide acid can be directly converted into sodium bisfluorosulfonimide, the synthesis steps and the discharge of three wastes are reduced, the production efficiency is improved, and the production cost is reduced.

The invention discloses a resource recycling process of a sodium hydrogenfluoride mother liquor byproduct, and belongs to the technical field of fluorine chemical industry waste liquid treatment. The process comprises the following three steps: firstly, preparing a sodium fluoride crystal by regulating the molar ratio of Na to F to be (1.05-1.08): 1, optimizing a feeding mode and adding a seed crystal; secondly, regulating the molar ratio of F to Si to be (6-9): 1 by using the sodium fluoride mother liquor, and adding white carbon black to prepare sodium fluosilicate; and finally, treating the F-containing waste liquid by compounding quick lime and slaked lime, regulating the molar ratio of Ca to F to be (2.1-2.5): 1, and reacting for 1-2 hours under the conditions of 50-70 DEG C and 300-400 r / min, so that the F content in the wastewater is less than or equal to 10 mg / L and the ammonia nitrogen content is less than or equal to 15 mg / L. According to the process, the total fluorine recovery rate is larger than or equal to 99%, the silicon recovery rate is larger than or equal to 95%, the main content of prepared sodium fluoride is larger than or equal to 98%, the main content of sodium fluosilicate is larger than or equal to 98%, and efficient resource utilization of sodium hydrogenfluoride mother liquor byproducts is achieved.

This invention discloses a method for preparing sodium difluorophosphate, comprising the following steps: reacting phosphorus pentachloride, phosphorus pentoxide, and sodium hydrogen fluoride as raw materials in an organic solvent; after the reaction, purging with inert gas, filtering, concentrating and crystallizing, washing, and drying to obtain sodium difluorophosphate. This method features low raw material cost, simple process, rapid reaction, few by-products, no water introduction, high product purity, and is environmentally friendly.