78 results about "Salt fluoridation" patented technology

The invention discloses a method for manufacturing a refractory material by innocent treatment of secondary aluminum ash, and belongs to the field of aluminum industry. The method comprises the following steps: further grinding the secondary aluminum ash until 80% of the secondary aluminum ash passes through a screen with the pore diameter of 74 microns; and calcining the secondary aluminum ash for 0.5-4 hours at the temperature of 1150-1550 DEG C in an oxidizing atmosphere with the oxygen content of 12%-18% to convert metal aluminum, aluminum nitride and aluminum carbide in the secondary aluminum ash into aluminum oxide and volatilize the fluoride salt and chloride salt in the secondary aluminum ash, thereby producing a calcined oxide; cooling the waste flue gas containing fluoride salt and chlorate produced in the calcining process for recovery, and denitrifying and discharging the flue gas. The calcined oxide is independently prepared or mixed with an additive, and the aluminum-magnesium refractory material is prepared after electric arc melting. The preparation method can be used for preparing the refractory material with high purity.

The invention relates to a method for manufacturing a refined high cleanliness Al-Ti-B alloy, comprising the following steps of: (1) melting an aluminum ingot, and adding potassium fluotitanate and potassium fluoborate for alloying; (2) pouring a reaction by-product floating on the surface of aluminum liquid, and neutralizing with alumina powder; (3) raising the temperature of the aluminum liquid, and scattering an alumina powder layer; (4) introducing argon or nitrogen with a pipe so that a residue solution coated in the aluminum liquid floats and is neutralized; (5) measuring the hydrogen content after the solution is treated by utilizing a small bubble rotation and degassing refining technology; (6) scattering a special high temperature anti-oxidation covering agent layer in the hot state of more than 800 DEG C; (7) raising the temperature of the aluminum liquid, introducing the aluminum liquid to a filtering box body filled with an alumina ceramic filter, and carrying out online filtering treatment on the alloy aluminum liquid; and (8) finally, reducing the temperature of the aluminum liquid, discarding scruff scum, and molding by casting to produce Al-Ti-B filaments. The method can effectively separate fluoride salt and other impurities in the Al-Ti-B alloy liquid so that the impurities in an Al-Ti-B alloy refining agent are reduced, and the cleanliness is greatly improved.

The invention discloses an environment-friendly low-resilience low-alkaline liquid setting accelerator and a preparation method thereof. The environment-friendly low-resilience low-alkaline liquid setting accelerator is prepared from, by mass, 50-60% of a modified polyaluminium sulfate solution, 1-5% of modified fluoride salt, 1-4% of modified alcohol amine, 1-3% of a dispersant and 30-42% of water. The preparation method specifically includes the following steps that 1, the a modified polyaluminium sulfate solution is prepared; 2, modified fluoride salt is prepared; 3, modified alcohol amine is prepared; 4, the dispersant and the balance water are added, stirring is carried out for 1-4 h at 40-70 DEG C, and the finished product is obtained. As for the total alkali amount of the prepared low-alkaline liquid setting accelerator, Na2O+K2O<3%, the pH ranges from 3 to 5, and harm to the skin is small; when applied to spraying concrete, the low-alkaline liquid setting accelerator guarantees construction safety and has the advantages of being low in resilience, capable of significantly improving later-stage strength and the like.

The invention discloses a method for preparing white carbon black from silicon slag containing fluorine. The method comprises the steps of: adding silicon slag containing fluoride and measured alkaline solution according to the proportion into a reaction kettle provided with a stirrer and a heating device; heating the mixture to 40-80 DEG C under fully stirring condition for maintaining for 20-50 min, so that the fluosilicic acid in the silicon slag containing fluoride is reacted completely to prepare a mixed solution of silicon dioxide and fluoride salt; heating or cooling the prepared liquid-solid mixture of silicon dioxide and fluoride salt to 50 DEG C or less, then filtering or centrifuging the mixture for liquid-solid separation so as to prepare a wet cake of silica and a filtrate of fluoride salt; backwashing the prepared wet cake of silica for 4-6 times, merging the first washing solution with fluoride salt to prepare a fluoride salt solution for other uses, and putting the second to the sixth washing solution into the first to the fifth washing solution tank respectively for the next first to fifth washing; drying the wet filter cake of silica to obtain white carbon black products. The method has the advantages of simplicity in processing, less equipment, simplicity and convenience in operation, and low production cost, and is convenient to realize industrial production.

The invention provides a liquid quick-setting agent and a preparation method thereof. The liquid quick-setting agent adopts aluminum sulfate as a main material, and is low in alkaline content, good in quick-setting effect and high in stability. The preparation method comprises the following steps of: uniformly mixing the following materials in percent by weight: 45%-60% of aluminium sulfate, 5%-15% of alcohol amine, 0.5%-5% of solubilizing agent, 0-5% of setting accelerator and the balance of water, thus obtaining the liquid quick-setting agent; the content of Al2O3 of the aluminium sulfate is 14%-17%; the solubilizing agent is phosphoric acid and/or hydroxy carboxylic acid with the number of carbon atoms being not more than 6; the setting accelerator is at least one of water-soluble nitrate, nitrite, sulfate, fluoride salt, carbonate and carboxylate-sulfonate-nonionic terpolymer. The liquid quick-setting agent obtained by the preparation method is used for jetting concrete, the doping amount is generally 5%-8% of the mass of cement, the quick setting effect is good, the stability is high and the stable period reaches more than 180 days.

The invention relates to a fluorine gas purifying filler and a preparation method and application thereof, the filler is a fluoride salt filler, and the fluoride salt is a mixture of one or more of sodium fluoride, potassium fluoride, calcium fluoride, magnesium fluoride, lithium fluoride. The filler is prepared from the fluoride salt and hydrofluoric acid with a concentration of no less than 5% by mixing, reaction, curing, molding, air-drying and roasting, the internal porosity of the filler is 40%-60%, has the characteristics of large porosity and strong skeleton, and has the characteristics of strong adsorption and good purification effect when used in fluorine gas purification, and the preparation method of the fluorine gas purifying filler is simple and easy to implement.

A method for recovering fluoride salt from aluminum electrolysis overhaul slag through pressurized alkaline leaching comprises the steps that waste cathodes and waste tank linings are subjected to two-stage crushing, NaOH solutions are added for wet ball milling, and waste cathode slurry and waste tank lining slurry are obtained; the waste cathode slurry and the waste tank lining slurry are respectively added into NaOH solutions to carry out pressurized alkaline leaching, and a cyanide breaking agent H2O2 which is 0.2-0.4% of the volume of a leaching solution is added in the pressurized alkaline leaching process to carry out cyanide breaking treatment; the pressure is released after pressurized alkaline leaching is completed, and the discharged ammonia gas is washed with sulfuric acid to form ammonium sulfate which can be used as a chemical fertilizer; the extract is filtered to obtain a leaching solution and leaching residues, countercurrent washing is connducted on the leaching residues, and then the leaching residues are dried to be used as an additive for smelting iron and steel, preparing cement and preparing a refractory material; the leaching solution is filtered after neutralized and precipitated, and filter residues are calcinated to form aluminum fluoride; and a filtrate is frozen and crystallized to obtain mirabilite. According to the method, the waste cathode carbon blocks and the waste tank linings can be subjected to harmless treatment and comprehensive resource utilization, and fluoride salt is obtained through recovery.

An apparatus for prepairng the regenerated fluoride salt and alumina from the waste generated by aluminium electrolysis is an improvement to the patent ZL96115111.0, and features that an additional crush-screen system composed hammer crusher and sieve set is used in the front of the said apparatus. Its advantages are low consumption of electric energy, no secondary pollution, high recovery rate and high quality of products.

The invention belongs to the technical field of aluminum smelting solid waste recycling and reusing, and particularly relates to a method for recycling fluoride salt from complex aluminum electrolyte. According to the method for recovering the fluoride salt from the complex aluminum electrolyte, the complex aluminum electrolyte and the aluminum sulfate are used as raw materials, the processes of roasting, acid pickling dissolution, alkaline leaching, lithium removal, potassium removal, sodium removal and the like are sequentially carried out, a pure fluoride product (aluminum fluoride/sodium fluoride) is prepared, the whole process flow is simple and green, and the yield is high. According to the method, the fluorine element, the lithium element and the like in the complex aluminum electrolyte are recycled at the same time, HF is not generated, the resource utilization efficiency and economic benefits are improved, and stable production of electrolytic aluminum enterprises is promoted.

The invention discloses a preparation method of an adsorbent for fluorine gas purification. The method comprises the following steps: proportionally mixing a fluoride salt raw material with a binder and a solvent, and performing concentrating, granulating, sintering and post-treatment to obtain the adsorbent for fluorine gas purification. The post-treatment method comprises the following steps: mixing a product obtained after sintering with fluorine gas or fluorine-nitrogen mixed gas with the volume fraction of 5%-10%, standing and reacting, wherein the use amount of the fluorine gas with the volume fraction of 5%-10% is 0.5-1.0 wt% of the adsorbent. The adsorbent for fluorine gas purification prepared by the method is large in porosity, strong in adsorption capacity, remarkably improved in mechanical property and good in use stability, can improve the fluorine gas purification efficiency in the fluorine preparation process, and has good practicability and wide utilization value. The preparation method disclosed by the invention is simple in process, universal in equipment, low in corrosivity and easy to realize automatic control. The raw materials used in the preparation method are commercially available products, and are low in price and easy to obtain.

The invention discloses a liquid-solid dual-fuel space nuclear reactor power supply. A reactor core comprises UC solid fuel rods, a fluoride salt coolant, a reactor core spectral shift absorber material, a reflecting layer material, a control drum and a reactor pressure vessel; the reactor core active area comprises a plurality of UC solid fuel rods, wherein coolant guide pipes are arranged in the UC solid fuel rods; a fluoride salt coolant is arranged in the coolant guide pipe, a cavity filled with helium buffer fission gas is formed in the end of the UC solid fuel rod, and the reflecting layer material and the control drum are arranged on the outer side of the reactor core active area. According to the invention, the residual reactivity, compactness and miniaturization of the reactor core are further improved while the heat of the reactor core is timely brought out, and the safety requirements of the reactor core are met in the service life operation process of the reactor core and under accident conditions.

A method for preparing aluminum fluoride and aluminum oxide by decarburization and sodium removal of an aluminum electrolysis carbon residue is disclosed. The method includes: crushing the aluminum electrolysis carbon residue into fine particles not larger than 3 mm, adding decarburization agent into the carbon residue, mixing to obtain first mixture, adding the first mixture into a high-temperature furnace, conducting I-stage heating treatment in air atmosphere to obtain crude fluoride salt A; adding sodium removal agent into the crude fluoride salt A, mixing to obtain second mixture, adding the second mixture into high-temperature furnace, and conducting

II-stage heating treatment to obtain crude fluoride salt B; adding the crude fluoride salt B into stirring tank, adding industrial pure water, dissolving a sodium salt into water, and conducting solid-liquid separation to obtain precipitate C and sodium salt solution D; drying the precipitate C to obtain aluminum fluoride and aluminum oxide.

The invention is applicable to the technical field of frosting etching, and provides a frosting etching solution and a preparation method and a use method thereof. The frosting etching solution comprises the following formula components in parts by mass: 10-15 parts of ammonium bifluoride, 3-5 parts of a sodium fluoride solution, 1-3 parts of other fluoride salts, 4-7 parts of sulfate, 5-8 parts of an alkaline pH regulator, and 6-9 parts of water. The frosting etching solution provided by the invention is strong in frosting etching capability, does not need to add an additional acidic pH regulator, and can be used for many times; glass treated by the frosting etching solution has a moderate frosting effect and has a diffuse reflection or light scattering function, so that the glare effect of an electronic screen or a lamp is reduced or avoided; the width value and the depth value of pits formed in the surface of the glass are both moderate, no burr feeling or rough feeling is generated, and the flash point effect is avoided; and the etched glass also has a visual effect similar to that of paper, accords with the watching habit of human eyes, and reduces visual fatigue.

The invention discloses a bismuth oxyfluoride photocatalyst and a preparing method of the bismuth oxyfluoride photocatalyst. The preparing method comprises the following steps of adding glacial acetic acid into water, wherein the volume ratio of the glacial acetic acid to the water is 1:2-5:1, stirring the glacial acetic acid and the water, adding bismuth nitrate and soluble fluoride salt into glacial acetic acid solution, stirring in thermostatic waterbath of 75 DEG C to 85 DEG C for 20 to 40 minutes to dissolve the bismuth nitrate and the fluoride salt, making mixed solution with the bismuth nitrate concentrate as 0.95mmol/30ml to 1.05mmol/30ml and the mole ratio of bismuth element to fluorine element as 1:1.9 to 1:2.1, adding the mixed solution into a polytetrafluoroethylene lining to be subjected to thermal reaction for 10 to 13 hours in constant-temperature water of 120 DEG C to 160 DEG C, and obtaining the bismuth oxyfluoride photocatalyst after centrifuging, washing and drying. The preparing method is simple, practical, easy to popularize in large scale, suitable for making the bismuth oxyfluoride photocatalyst with high catalytic activity and applied to catalytic degradation of organic pollutants.

The invention discloses a hydrothermal preparation method of a nano-titania coating on surface of a magnesium alloy intravascular stent. The preparation method comprises the following steps: uniformly mixing absolute ethyl alcohol and hydrofluoric acid, and then adding tetrabutyl titanate for blending to obtain solution A, wherein the concentration of hydrofluoric acid in the solution A is 0.1-0.4 mol/L, and the concentration of tetrabutyl titanate is 0.1-0.3 mol/L; dissolving fluoride salt in deionized water to obtain solution B, wherein the concentration of fluoride salt in the solution B is 0.1-0.4 mol/L; then uniformly mixing the solution A and the solution B to obtain solution C; placing the magnesium alloy intravascular stent after processing into the solution C, and taking out after a hydrothermal reaction so as to obtain the nano-titania coating. The method has the advantages of being environment-friendly, convenient to process, easily-obtained, low in price, and the like; the bonding force of the obtained sheet nano-titania coating and the magnesium alloy intravascular stent is high, and the nano-titania coating has good corrosion resistance and blood compatibility, the coating is large in porosity and specific area, the dimensions are uniform and controllable, and the nano-titania coating is suitable for intravascular stent medicine carrying.

The invention provides a method for etching MXene based on electrochemical etching, MXene turbid liquid and application of the MXene turbid liquid, an organic solvent of fluoride salt is used as an electric etching solution, an MAX electrode is used as a working electrode, and MXene is obtained under the action of electrochemical etching. According to the method provided by the invention, the powdery or turbid liquid MXene can be prepared according to the post-treatment step of the etching liquid. In addition, by-product metal fluoride can be removed in an environment-friendly manner through post-treatment, few-layer MXene can be directly obtained, and the technological process is simplified.

The invention relates to the technical field of glass deep processing, and particularly discloses a forming process with an anti-fingerprint, anti-scratch and wear-resistant glass substrate etching effect, which is mainly applied to chemical etching of a glass mobile phone back cover. A honeycomb-like particle layer is formed on the surface of the glass mobile phone back cover to disperse lines of fingerprints as much as possible, so that an anti-fingerprint effect is achieved; meanwhile, the honeycomb-like particle layer is good in wear resistance and can be used for a long time without falling off. Besides, organic acid such as p-toluenesulfonic acid and methanesulfonic acid is adopted as acid in the etching solution and combined with fluoride salt (ammonium hydrogen fluoride and sodium fluoride) to form effective components in the etching solution, production is stable during frosting, and waste liquid obtained after frosting is environmentally friendly; in addition, the etching liquid is low in price, the etching process is easy to control, the production yield is high, and the product quality is stable.

The invention belongs to the field of building materials, and particularly relates to an accelerator as well as a preparation method and an application thereof. The accelerator is mainly prepared by mixing water and the following raw materials in parts by mass: 35-50 parts of aluminum salt, 1-3 parts of silicate, 3-10 parts of fluoride salt, 5-10 parts of a neutralizer and 5-10 parts of a stabilizer. The aluminum salt, the silicate, the fluoride salt, the neutralizer and the stabilizer are introduced into the accelerator, so that the accelerating effect is remarkable, and the stability of the accelerator can be obviously enhanced.

The present disclosure provides systems and methods for thermal molten salt reactor fuel-salt preparation. In one implementation, the method may comprise providing fuel assemblies having fuel pellets, removing the fuel pellets and spent fuel pieces from the fuel assemblies, processing the spent fuel pellets and fuel pieces into a fluoride salt by ultimate oxidation, reduction, and fluorination of uranium and its associated fuel constituents, and filtering water vapor formed during the reduction and fluorination operations.

The invention discloses a lithium hexafluorophosphate tail gas comprehensive utilization method, which comprises: (1) phosphorus pentafluoride recovery: introducing lithium hexafluorophosphate process tail gas into a washing tower, washing with an organic solvent, carrying out heating desorption on the obtained washing liquid, carrying out condensation impurity removal on the desorbed gaseous substance to obtain a phosphorus pentafluoride gas, and recycling the phosphorus pentafluoride gas, the desorbed organic solvent and the condensed organic solvent are mixed and cyclically used for tail gas washing; the organic solvent is carbon tetrachloride or benzene; (2) fluorine recovery: introducing the tail gas washed in the step (1) into a chlorate solution to react to remove fluorine, enabling hydrogen fluoride in the tail gas to react with the chlorate in the solution to generate fluoride salt, precipitating, then filtering, washing and drying to obtain fluoride salt, supplementing the chlorate into filtrate, and then circularly using the filtrate for removing fluorine from the tail gas; and (3) hydrogen chloride recovery: carrying out multi-stage absorption on the tail gas in the step (2) by using water to obtain industrial-grade concentrated hydrochloric acid.