27 results about "Fluorosilicate salt" patented technology

The invention provides aerogel for sewage treatment and a preparation method thereof.The preparation method comprises the steps that a fluosilicate solution and a silicon source material are mixed, then a metal ion targeting polymer is added for a reaction, and fluosilicate modified silica sol is obtained; adding a titanium-based photocatalyst into the fluosilicate modified silica sol, and uniformly mixing to obtain a mixed solution; transferring the aerogel sol into a mold, keeping a constant temperature for gelatinization for 24 hours, putting into a freezing environment of-40 DEG C for freeze-drying, heating to 300 DEG C, and keeping the temperature for 3 hours to obtain the aerogel. Therefore, the adsorption capacity of the aerogel and the degradation effect on pollutants are improved.

The invention relates to a method for preparing high-purity fluosilicate by taking industrial fluorine-containing sludge as a raw material. Comprising the following steps: slurrying calcium fluoride sludge, acidifying with inorganic acid, adding an adsorbent, and filtering; adding soluble salt into the filtrate to carry out crystallization reaction and adjusting the pH value; and cooling, filtering, washing and drying to obtain a target product. Solid waste resource utilization is achieved, the product purity is larger than or equal to 98%, and energy consumption is reduced by 60% or above compared with a traditional process.

This invention discloses a method for recovering fluoride from white fertilizer while simultaneously preparing slow-release nitro fertilizer, belonging to the field of clean processing and utilization technology of phosphorus resources. This invention uses nitric acid to perform staged acid hydrolysis of white fertilizer. The phosphorus-containing filtrate after preliminary acid hydrolysis has a low impurity content and can be used to prepare water-soluble ammonium phosphate. The remaining acid hydrolysis residue undergoes complete acid hydrolysis to completely leach phosphorus and fluoride elements, followed by defluorination. Fluorine precipitates as fluorosilicates, which can be further separated to obtain fluorosilicate products. The defluorinated liquid is neutralized and dried to obtain the slow-release nitro fertilizer product. This method comprehensively utilizes the phosphorus and fluoride resources in white fertilizer, achieving clean processing and utilization of phosphorus resources. The overall process of the method described in this invention is simple to implement, has low production costs, and fully utilizes the phosphorus and fluoride resources in white fertilizer.

The invention relates to a method for extracting lithium through gradient microwave activation-fluorosilicate synergistic selection. The invention relates to a gradient microwave activation-fluosilicate cooperative selection lithium extraction method, which comprises: adding an activator fluosilicate to lepidolite concentrate, carrying out pretreatment, and carrying out gradient microwave activation treatment to obtain activated lepidolite concentrate powder; the lepidolite concentrate powder, a composite acid leaching agent, a configuration regulator and a stabilizer are mixed and subjected to acid leaching, and a lithium-rich solution is obtained; the composite acid leaching agent at least comprises phosphoric acid. The method solves the problems of low total yield of lithium, complicated subsequent purification treatment and high cost caused by high impurity content of the existing lepidolite lithium extraction lixivium, also solves the problem of difficult separation of lithium and aluminum, reduces the impurity content, improves the recovery rate and purity of lithium, and reduces the treatment cost at the same time.

The invention discloses a regeneration method of silicon oxide polishing waste liquid and application thereof. The regeneration method comprises the following steps: S1, collecting crystallized or agglomerated silicon oxide polishing waste liquid; s2, adding a hydrofluoric acid aqueous solution into the waste liquid, uniformly mixing for reaction, eroding bonding points on the surfaces of the agglomerated silicon oxide particles by utilizing hydrofluoric acid, converting part of silicon oxide into movable fluosilicate ions, and combining the fluosilicate ions with metal cations in the waste liquid to generate fluosilicate precipitates; s3, performing primary filtration on the mixed solution treated in the step S2 through a first filter medium to remove particles with the particle size greater than a first threshold value so as to obtain a primary filtrate; s4, the primary filtrate is subjected to secondary filtration through a second filter medium, particles with the particle size larger than a second threshold value are removed, fine filtrate is obtained, and the pore diameter of the second filter medium is smaller than that of the first filter medium; and S5, collecting the fine filtrate as a regenerated silicon oxide polishing solution. The invention aims to reduce the chemical mechanical polishing processing cost of the silicon carbide substrate.

This invention provides a method for improving the adhesion between a TGV product and a circuit layer, comprising the steps of surface treating the TGV product with a surface treatment solution, wherein the surface treatment solution contains a solute and water by weight, the solute comprising 5-30 parts of acid, 8-35 parts of fluoride, 5-25 parts of fluorosilicate, 3-25 parts of fluorine-free soluble metal salt, and 0.3-2.0 parts of surfactant, the chemical formula of the fluoride being M1F or M2F2, where M1 is selected from K, Na, or NH4, and M2 is selected from NH4H, Mg, Ba, or Ca; and a circuit layer is formed on the surface of the TGV product after step (1). This method can improve the adhesion strength between the TGV product and the circuit layer, thereby providing a high-performance chip packaging structure.

The invention belongs to the technical field of luminescent functional materials, and discloses a fluorosilicate fluorescent single crystal material with high Mn < 4 + > content as well as a preparation method and application thereof, and the chemical composition of the fluorosilicate fluorescent single crystal material is A2Si1-nMnnF6, wherein A is one or a combination of two of alkali metals Rb and Cs, n is a molar ratio of Mn < 4 + > ions to the total amount of Mn < 4 + > and Si < 4 + > ions, and n is more than 0 and less than or equal to 1. The red light single crystal material is prepared through a component regulation and control single crystal method, the method is simple and easy to implement and mild in condition, the obtained red light single crystal material is complete in single crystal morphology and controllable in size, 20-60% high manganese content solid solution is achieved, the disadvantage that the quenching concentration of typical fluorides is low is broken through, the red light single crystal material can be well matched with various LED devices such as ultraviolet light, purple light and blue light, and the red light single crystal material has good application prospects. The external quantum efficiency is obviously improved to 40-80%, and the color gamut of a packaged LED device reaches 106% NTSC.

The invention discloses a method for recovering fluorine in a white fertilizer and preparing a slow-release nitro fertilizer at the same time, and belongs to the technical field of clean processing and utilization of phosphorus resources. The white fertilizer is subjected to fractional acidolysis by using nitric acid, and the phosphorus-containing filtrate subjected to preliminary acidolysis is low in impurity content and can be used for preparing water-soluble ammonium phosphate. And the residual acidolysis residues are subjected to complete acidolysis, phosphorus and fluorine elements are completely leached and then defluorination is performed, fluorine is precipitated in the form of fluosilicate, and a fluosilicate product can be obtained through further separation. According to the method, phosphorus and fluorine resources in the white fertilizer are comprehensively utilized, and clean processing and utilization of the phosphorus resources are achieved. The method is simple in whole process implementation method and low in production cost, and phosphorus and fluorine resources in the white fertilizer are fully recycled.

The invention discloses a method for recovering fluorosilicate from high-purity quartz sand pickling wastewater, and belongs to the field of fluorosilicate recovery technology. The method of the present invention comprises the following steps: S1 high-purity quartz sand is pickled with hydrofluoric acid (ultrapure);S2 pickling is press-filtered to pickling solution after the pickling is completed to obtain fine quartz sand solid and fluorosilicic acid filtrate;S3 fluorosilicic acid filtrate is stirred and heated up and concentrated and then continues to add inorganic alkali solution for sedimentation, until the mixed solution pH is 7.2-7.5 and stops adding inorganic alkali solution;S4 carries out press-filtration to the mixed solution after sedimentation, collects filter cakes to dryness and obtains fluorosilicate. The fluorosilicate purity obtained by applying this method to reclaim is high and the recovery rate is high, and it is achieved that waste resources can be reused, and environmental protection is achieved, with the characteristics of green environmental protection economy.

The invention relates to the technical field of TFT-LCD (Thin Film Transistor Liquid Crystal Display) glass, in particular to TFT-LCD glass surface micro-defect repairing liquid medicine which comprises fluosilicate, silicate, a calcium sulfate polymerizing agent and water. According to the invention, a silicate / fluosilicate chemical buffer system is used for pretreatment before thinning of a TFT-LCD (Thin Film Transistor-Liquid Crystal Display), and micro-defects on the surface of the glass are filled, so that the micro-defects on the surface of the glass are eliminated.

The invention belongs to the technical field of concrete admixtures, and discloses an anti-mud agent based on artificial sand mud powder surface in-situ modification as well as a preparation method and application of the anti-mud agent. The anti-mud agent is prepared from the following raw materials in parts by mass: 1 to 10 parts of fluosilicate, 0.1 to 10 parts of silane coupling agent, 0.1 to 1 part of cationic surface active agent, 0.1 to 0.5 part of sodium lignin sulfonate and 0.5 to 1 part of polyethylene glycol. According to the invention, fluosilicate reacts with active Al < 3 + >, Ca < 2 + > and the like in the mud powder in the artificial sand to generate an insoluble fluoroaluminate inorganic membrane, and the insoluble fluoroaluminate inorganic membrane tightly wraps the surfaces of mud powder particles, so that the adsorption characteristic of the mud powder is essentially changed. The water reducing agent further comprises the silane coupling agent, the silane coupling agent is hydrolyzed and then condensed with hydroxyl on the surface of the mud powder to form a hydrophobic organic silicon film, water absorption and expansion are inhibited, adsorbed water is released, adsorption of the mud to the water reducing agent is reduced, and meanwhile the mechanical property of an interface transition area can be improved.

The application relates to the technical field of building materials, and discloses a structural compactness self-waterproof material for underground engineering concrete and application thereof, raw materials of which include, in terms of weight parts, 10-14 parts of konjak dry gel, 20-25 parts of modified expansive agent, 10-15 parts of fluorosilicate, 2-5 parts of aluminum sulfate, 10-12 parts of porous powder, 7-9 parts of dispersant and 8-10 parts of water reducing agent. The structural compactness self-waterproof material can realize good self-waterproof function and structural compactness of the concrete, the konjak dry gel and the modified expansive agent can make the concrete slurry moderately expand in the plastic and hardening stages, can compensate early shrinkage and later self-generated volume change, and can improve the volume stability; the modified expansive agent can also serve as a reinforcing phase, effectively plays a skeleton support and reinforcing role, improves the compressive strength of the concrete, and further improves the waterproofness of the concrete.

The invention relates to the technical field of catalyst preparation, in particular to a bifunctional molecular sieve catalyst for coproduction of ethylbenzene by hydrogenation of carbon dioxide and a preparation method thereof. The preparation method comprises the following steps: 1) modifying a molecular sieve; 2) preparing a bifunctional molecular sieve catalyst; and 3) molding the molecular sieve catalyst. In the preparation process of the bifunctional molecular sieve catalyst, a fluorosilicate modified molecular sieve is used as a catalyst precursor, copper salt, zinc salt and a silicon source are loaded by accurately controlling a coprecipitation method, and carbon dioxide hydrogenation is performed on the outer layer (Cu / Zn / Si main part) of the catalyst to obtain methanol; and methanol further reacts with toluene in the inner layer (the main body part of the molecular sieve) of the catalyst to obtain a target product ethylbenzene, so that the bifunctional molecular sieve catalyst with excellent physical and chemical properties is finally realized. The stability of the catalyst prepared by the technology is remarkably improved, the yield of a target product is relatively high, and a new way is provided for resource utilization of carbon dioxide.

This application relates to a system and method for the resource utilization of fluoride-containing wastewater. The system includes: a pretreatment unit for removing impurities and filtering fluoride-containing waste acid; a silicon source addition unit connected to the pretreatment unit for adding a silicon source to convert hydrofluoric acid in the fluoride-containing waste acid into fluorosilicic acid to obtain a pretreatment solution; an acid-base adjustment unit connected to the pretreatment unit for adjusting the pH value of the pretreatment solution by adding waste alkali to obtain a concentrated solution; a multi-stage evaporation, concentration, and crystallization unit connected to the acid-base adjustment unit for multi-stage evaporation, concentration, and crystallization of the concentrated solution to obtain a silicate sol; and a crystallization and drying unit connected to the multi-stage evaporation, concentration, and crystallization unit for cooling, crystallizing, and drying the silicate sol to obtain fluorosilicates. This system can achieve efficient and deep purification of fluoride-containing waste acid and synergistically utilize waste gas and waste alkali from the photovoltaic industry. Through multi-stage concentration and purification, it produces high-purity, low-moisture fluorosilicates, reducing energy consumption and reagent costs.

The present application relates to a kind of low energy consumption conversion phosphorite by-product hydrogen fluoride, fluorosilicic acid method, belong to fine chemical industry technical field.The new low energy consumption conversion phosphorite by-product hydrogen fluoride, fluorosilicic acid method includes: a, extraction;B, inorganic base back extraction;Or inorganic salt back extraction;C, remove water to obtain fluorosilicate solid from the aqueous phase fluorosilicate solution;D, pyrolysis;Or acidolysis.The present application is compared with the process for preparing anhydrous hydrogen fluoride and silicon tetrafluoride using phosphorite by-product dilute fluorosilicic acid currently, with wide application range, the difficulty of fluorosilicic acid preparation process is reduced, and energy consumption is greatly reduced;The economic value of the present application is that high-value fluorination product, high-purity silicon tetrafluoride gas and anhydrous hydrogen fluoride gas can be obtained simultaneously, and the final obtained product is recycled or can be sold as product, without by-product and waste to be treated again.

The application belongs to the technical field of fluorine chemical industry, and particularly relates to a preparation method of a fluorinated salt adsorbent for fluorine gas purification and application thereof, aiming to solve the problems of low porosity, small adsorption capacity, low structural strength, and serious pulverization rate of the fluorinated salt adsorbent in the prior art, which are not conducive to industrialized continuous generation. The fluorinated salt adsorbent has a large specific surface area, high adsorption capacity, high strength, and good fluorine gas purification effect. The preparation method is simple, has small equipment corrosion, and can be popularized for industrialized production. The application adopts alkali solution reaction, fluorination etching, and calcination decomposition steps, can completely convert fluorosilicate powder into the fluorinated salt adsorbent, and is helpful to the pore-forming effect of the fluorinated salt adsorbent. The application does not need to add an organic binder, can realize granulation and molding by using the reaction of the fluorosilicate powder and the alkali solution, and has good structural strength in the preparation of the fluorinated salt adsorbent.

The application discloses a composite rust conversion film forming liquid, which is configured from a certain amount of ethanol, tannic acid, concentrated H3PO4, HEDP, manganese iron phosphate, fluorosilicate, a composite film forming accelerator, a surfactant and an antifreezing agent. The application discloses a quick repair process of the composite rust conversion film forming liquid for the rusted parts of special equipment, which comprises the following steps: configuration of the conversion liquid, pretreatment of the rusted parts, alcohol cleaning, application of the conversion liquid, drying and repair painting. The application solves the problem that the rust of the steel and aluminum alloy parts of the weapon equipment in the production and service period affects the battle index and service life, and ensures the tactical index and application performance of the weapon equipment in the whole life cycle, so as to meet the national security and defense requirements.

The invention provides a propylene dimerization catalyst and a preparation method and application thereof.The propylene dimerization catalyst comprises a carrier and elemental alkali metal loaded on the carrier, and the carrier is prepared by drying and roasting a pasty mixture of silicon dioxide, metal fluoride, carbonate, hexafluorosilicate and water; the propylene dimerization catalyst is obtained by carrying out ball milling on the raw materials by using a ball milling technology and then carrying out molding treatment. The preparation method of the propylene dimerization catalyst is simple, the production scale is controllable, and large-batch preparation of the propylene dimerization catalyst can be effectively realized; compared with alkali carbonate, the carrier has higher lateral pressure strength and lower abrasion rate, so that when the propylene dimerization catalyst is applied to preparation of 4MP1 by propylene dimerization, the preparation of 4MP1 by propylene dimerization has higher conversion rate and product yield, and can be used for preparing 4MP1 by propylene dimerization. And adverse effects caused by low mechanical strength of alkali carbonate can be overcome.

The invention relates to the technical field of water treatment, in particular to a scale inhibitor for a wet-process phosphoric acid production device and a preparation method and application of the scale inhibitor. The invention discloses a scale inhibitor for a wet-process phosphoric acid production device as well as a preparation method and application of the scale inhibitor. The scale inhibitor comprises the following components in parts by weight: 40 parts of ammonium citrate, 2 parts of sodium alkyl benzene sulfonate and 5-15 parts of a carbon dot scale inhibitor. The problems that a traditional scale inhibitor is prone to inactivation in a strong acid environment and is difficult to deal with silicon-fluorine scale are solved. Experimental results show that the maximum scale inhibition rate of the scale inhibitor to calcium sulfate and fluosilicate scale in a simulated wet-process phosphoric acid system can reach 96%, equipment scaling can be effectively prevented, and long-period stable operation of the device is guaranteed.

This invention relates to the field of TFT-LCD glass technology, specifically to a micro-defect repair solution for TFT-LCD glass surfaces, comprising fluorosilicate, silicate, calcium sulfate polymerizing agent, and water. This invention utilizes a silicate / fluorosilicate chemical buffer system for pretreatment before TFT-LCD thinning to fill and eliminate micro-defects on the glass surface.

This invention belongs to the field of chemical production technology, specifically relating to a method for controlling the endpoint of an alkaline hydrolysis reaction of fluorosilicates. The method includes the following steps: gradually adding a strong alkali solution to the fluorosilicate for alkaline hydrolysis; near the reaction endpoint, adding an alkali metal carbonate to continue the reaction until the endpoint is reached. This method is simple and convenient to operate, allows adjustment of the reaction endpoint to a predetermined value, avoids affecting the quality of silica due to excessive addition of strong alkali, and ensures complete alkaline hydrolysis of fluorosilicates.

The invention belongs to the field of wastewater treatment processes, and particularly relates to silanized silicon dioxide and a preparation method thereof, and a corresponding process for treating phosphogypsum slag field wastewater through chemical precipitation coupled membrane concentration. A silane coupling agent containing sodium carboxylate or potassium carboxylate is used for carrying out silanization modification on the surface of hydrophilic vapor-phase silicon dioxide, and modified silicon dioxide particles and K2S or Na2S, sodium polyacrylate or potassium polyacrylate are used as fluosilicic acid precipitation inducers; fluorosilicate which is easy to cause membrane scaling in the waste water of the phosphogypsum slag field is separated by the inducer before entering a separation membrane system, so that the problem that a filtering membrane is easy to block is fundamentally solved. And meanwhile, the purity of phosphorus in the concentrated water generated by multi-stage reverse osmosis is remarkably improved, and high-value recovery of phosphorus resources is realized. In addition, the scaling risk of a membrane system is reduced, stable operation can be realized under a wider pH condition, the service life of the membrane is prolonged, and the chemical cleaning frequency is reduced, so that the operation cost and the membrane depreciation cost are reduced.

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 a method for recovering valuable elements from a lithium-containing acid solution, and solves the problems of difficulty in product recycling, low lithium recovery rate and the like in a traditional purification process. The method comprises the following steps: firstly, precipitating silicon and aluminum in the lithium-containing acidic leaching solution step by step to obtain fluosilicate and fluoroaluminate products, then precipitating lithium in the solution to obtain a lithium phosphate product, and carrying out evaporative crystallization on the precipitated solution to obtain a product which can be returned to the impurity removal step. The core of the method is that silicon and aluminum impurities are produced in the form of high-purity byproducts and efficient closed-loop recovery of lithium is realized by utilizing the coordination state difference of silicon, aluminum and fluorine ions in an acid solution. The method provided by the invention has the characteristics of short process flow, high product purity and appreciation in the process.

The present invention provides an anode foil and its preparation method and application. The pore-forming solution of the anode foil, by weight, comprises the following components: 3-4 parts of aluminum salt, 30-35 parts of sulfuric acid, 4-5 parts of hydrochloric acid, and 0.01-0.5 part of a metal surface treatment agent; the metal surface treatment agent is composed of one or more of polyoxyethylene ether, phosphate ester, and fluorosilicate. On the one hand, the metal surface treatment agent in the pore-forming solution of the anode foil can form more exposed aluminum bases on the crystal plane, reduce its pitting potential, obtain more uniform pore-forming points, and avoid the phenomenon that the pore-forming points gather at the grain boundary part while the pores are sparse in the crystal plane part; on the other hand, the metal surface treatment agent slows down the formation of the aluminum sulfate film to a certain extent, which is beneficial to the deepening and expansion of pores and reduces the proportion of fine and shallow ineffective pores. The number of pores on the surface of the anode foil prepared by the pore-forming solution provided by the present invention is ≥10<supgt;7< / supgt; / cm<supgt;2< / supgt>, and the pore diameter size is 1.15-1.19 μm. The pore uniformity on the surface of the anode foil prepared by the present invention is improved, and the electrostatic specific capacitance of the anode foil is significantly increased.

The utility model discloses a washing system for wet-process phosphoric acid tail gas, and belongs to the technical field of phosphorus chemical industry. The system comprises a venturi scrubber, a scrubbing tower, a horizontal scrubbing spraying device, a tail gas fan and a chimney which are connected in sequence, the venturi scrubber and the scrubbing tower share a first circulating tank in the scrubbing tower; a water replenishing port of the first circulating tank is connected with a process water storage tank through a pipeline, and a water discharging port is connected with a dissolving tank of a fluosilicate production system through a pipeline; a water replenishing port of the horizontal washing and spraying device is connected with the ardealite backwater storage tank through a pipeline, and a water outlet of the horizontal washing and spraying device is connected with the wastewater treatment system through a pipeline. The Venturi scrubber and the scrubbing tower are additionally arranged, process water is adopted for water supplementing, scrubbing liquid is conveyed to the dissolving tank, fluorine and silicon can be recycled, the fluorine content in tail gas is reduced, and the horizontal scrubbing spraying device is prevented from being blocked; the horizontal washing and spraying device adopts ardealite backwater to supplement water, so that the consumption of the ardealite backwater is realized, and the treated tail gas meets the emission standard.

The invention provides a semiconductor pre-cleaning method, relates to the technical field of semiconductor processing, and aims to solve the problem of large fluorine residual amount in a silicon-titanium interface. The semiconductor pre-cleaning method is used for removing an oxide layer on the surface of a silicon layer or a germanium-silicon layer of a wafer. The method comprises the following steps: an etching step: providing a fluorine-containing etching agent, and enabling the fluorine-containing etching agent to react with a surface oxide layer to generate a solid by-product; the solid by-product comprises a fluorosilicate; an annealing step: adjusting the surface temperature of the wafer, decomposing the fluosilicate to form a gaseous by-product, and discharging the gaseous by-product; the gaseous by-product comprises a fluorosilicone compound; and a fluorine removal step: providing neutral hydrogen atoms or neutral hydrogen-containing free radicals, enabling the neutral hydrogen atoms or the neutral hydrogen-containing free radicals to react with the fluorine-silicon compound to generate hydrogen fluoride, and discharging the hydrogen fluoride. The fluorine residual amount in the silicon-titanium interface can be reduced.