28 results about "High fluoride" patented technology

A treatment agent for acidic fluorine-containing wastewater and a method for using the same. The treatment agent for acidic fluorine-containing wastewater of the present invention comprises an agent A and an agent B; the agent A comprises carbonate minerals and silicate minerals; the agent B is mainly aluminum salt. The method for using the treatment agent for acidic fluorine-containing wastewater of the present invention comprises the following steps: (1) pretreatment: sedimentation filtration to remove suspended solids; (2) pH adjustment: adding agent A to the acidic fluorine-containing wastewater to make the solution pH 6.5-7.5; (3) coagulation precipitation: adding agent B to the solution, standing and precipitating after reaction, and the supernatant is discharged. The use of the treatment agent for acidic fluorine-containing wastewater of the present invention can effectively improve the acid-base buffering capacity of the water quality, and spontaneously stabilize the pH to 6.5-7.5, with high fluorine removal efficiency. It can also improve the sedimentation efficiency of the fluorine removal alum flower, avoid the use of polyacrylamide, and the treatment process is simple and low-cost.

This disclosure provides processes for reforming hydrocarbons by using a series of adiabatic reactors and catalysts, in which the catalyst(s) in at least one front or upstream catalyst bed or reactor includes a higher fluoride concentration, higher chloride concentration, or both than the respective halide concentrations in the catalysts in one or more downstream catalyst beds or reactors, which has been unexpectedly discovered to extend the useful life and / or the selectivity of the catalyst system.

The invention discloses an ammonium fluosilicate modified molecular sieve preparation method, which comprises: (1) contacting active carbon with a fluorocarbon surfactant aqueous solution to carry out modification treatment so as to obtain modified active carbon; (2) mixing the modified activated carbon obtained in the step (1), a molecular sieve and an ammonium fluosilicate solution for reaction, and separating a reaction product to obtain waste activated carbon and a modified molecular sieve precursor; and (3) washing, drying and roasting the modified molecular sieve precursor obtained in the step (2) to obtain the modified molecular sieve. The method has the advantages of simplicity and convenience in operation, low cost, high fluoride removal efficiency, high modified molecular sieve product yield and the like.

This invention belongs to the field of waste acid treatment technology, specifically disclosing a zeolite-like molecular sieve membrane for removing fluoride and chlorine from waste acid and its preparation method. The molecular sieve membrane comprises a dispersed phase and a continuous phase. The dispersed phase is zeolite-like molecular sieve nanoparticles, and the continuous phase is formed by dissolving PVDF monomer particles. The zeolite-like molecular sieve nanoparticles are prepared by dissolving a metal compound in a first solvent under ultrasonic conditions, then dissolving it in a second solvent to form a mixed solution I, followed by drying. The preparation method includes a blending method to prepare a PVDF molecular sieve blend membrane, and a surface coating modification step for the PVDF molecular sieve blend membrane. This invention prepares a zeolite-like molecular sieve membrane for waste acid systems through a blending method, allowing fluoride and chlorine ions to permeate while retaining sulfate ions, thereby removing fluoride and chlorine and reducing the loss rate of sulfate ions, achieving the recycling of sulfuric acid resources. It features high fluoride and chlorine removal rate, high sulfate retention rate, good corrosion resistance, and high water flux.

Provided is a solid electrolyte material for fluoride ion batteries which has high fluoride ion conductivity. The solid electrolyte material for fluoride ion batteries includes a metal composite fluoride that includes, as its main phase, a crystal structure containing, in a fluorite structure containing a fluoride ion, a lanthanoid metal ion, and an alkali earth metal ion, an adduct ion having an ion radius larger than that of the alkali earth metal ion. The metal composite fluoride has a composition in which a ratio of a number of moles of the fluoride ion to a total number of moles of the lanthanoid metal ion, the alkali earth metal ion, and the adduct ion is greater than 1.87 and is smaller than 3, and a ratio of a number of moles of the adduct ion to a number of moles of the alkali earth metal ion is smaller than 1.

The invention discloses a lanthanum-enhanced fluorine removal agent and a production and recovery method and application thereof, and belongs to the technical field of industrial wastewater treatment.The lanthanum-enhanced fluorine removal agent takes cellulosic fibers as an adhesive, alkaline earth metal salt inorganic powder as a basic adsorption component, and a compound of rare earth element lanthanum is additionally added as an active ingredient; the production process comprises three steps of mixing and stirring, forming and drying. The fluorine-containing wastewater is contacted with the fluorine removal agent, alkaline earth metal reacts with fluorine to generate insoluble fluoride, lanthanum compounds synchronously form a stable fluorine-lanthanum complex, and the fluorine ion concentration is reduced to 5 mg or below under the dual action; during fluorine recovery, a formed body adsorbing fluorine is separated, and a high-purity alkaline earth metal fluoride and lanthanum oxide mixed product is obtained after drying, sintering and cellulose removal, so that collaborative recovery of fluorine and rare earth resources is realized; the fluorine removal agent is good in raw material compatibility, controllable in preparation cost, high in fluorine removal efficiency and recovery rate and suitable for various fluorine-containing industrial wastewater treatment scenes.

The present invention provides an application of lactobacillus in the preparation of a medicine for preventing and / or treating liver and / or kidney and / or bone damage caused by excessive intake of fluoride, and relates to the technical field of lactobacillus application. The present invention achieves the purpose of preventing and / or treating damage to the liver and / or kidney and / or bone by reducing the accumulation of fluoride in the liver and / or kidney and / or bone, and the lactobacillus is Lactobacillus johnsonii BS15. Lactobacillus johnsonii BS15 is used to reduce the accumulation of fluoride in the body, especially in the liver, kidney and bone during high fluoride exposure, improve the damage to organs caused by high fluoride exposure, promote the excretion of fluoride from the body, promote the excretion of fluoride from the kidney, promote the excretion of fluoride in feces and urine, and improve the damage to the liver, kidney, lung and nerve center of mice. It is safe and effective to use, has no toxic side effects, and has a wider application.

This invention discloses a method for preparing ammonium fluorosilicate modified molecular sieves. The method includes the following steps: (1) contacting activated carbon with an aqueous solution of a fluorocarbon surfactant to modify it, thereby obtaining modified activated carbon; (2) mixing the modified activated carbon and molecular sieve obtained in step (1) with an ammonium fluorosilicate solution for reaction, and separating the reaction products to obtain waste activated carbon and modified molecular sieve precursors; (3) washing, drying, and calcining the modified molecular sieve precursors obtained in step (2) to obtain modified molecular sieves. The method has the advantages of simple operation, low cost, high fluoride removal efficiency, and high yield of modified molecular sieve products.

The utility model discloses a waste water defluorination device, which belongs to the technical field of waste water treatment and comprises a water inlet, a PH adjusting chamber and a defluorination reaction chamber, the water inlet is arranged at the PH adjusting chamber, an acid liquor inlet is further arranged in the PH adjusting chamber, and the PH adjusting chamber is communicated with the defluorination reaction chamber through a first connecting pipe, so that before the defluorination process starts officially, the acid liquor inlet is communicated with the defluorination reaction chamber through a second connecting pipe. According to the method, the pH value of the wastewater can be adjusted, so that silicate is replaced, then a fluorine removal agent is added, a full reaction is performed, and a fluosilicic acid complex system is destroyed, so that a relatively high fluorine ion removal rate is obtained, and the problem that silicate and fluoride contained in the lepidolite beneficiation wastewater can form a fluosilicic acid complex in the prior art is solved. The precipitation of fluorine ions and calcium ions in the wastewater is influenced, so that the fluorine removal efficiency is relatively low.

The present invention relates to a low-molecular-weight organic acid grafted modified forward osmosis composite membrane, its preparation method, and application. The composite membrane comprises a support layer and a separation layer that has been grafted twice. The grafted modified raw materials include polyethyleneimine and / or a low-molecular-weight organic acid. The preparation method comprises the following steps: preparation of the separation layer: on the support layer, interfacial polymerization is carried out using a solution of m-phenylenediamine and a solution of trimesoyl chloride to obtain a polyamide separation layer; primary modification of the separation layer: coating an aqueous solution of polyethyleneimine on the polyamide separation layer to obtain a primary grafted modified composite membrane; and secondary modification of the separation layer: coating an aqueous solution of a low-molecular-weight organic acid on the primary grafted modified composite membrane to obtain a secondary grafted modified low-molecular-weight organic acid grafted modified forward osmosis composite membrane. The composite membrane is used for forward osmosis treatment or recovery of fluorine-containing wastewater systems. Compared with the prior art, the present invention has the advantages of higher water flux and higher fluoride ion rejection rate during the forward osmosis process.

The invention relates to a method for detecting the content of aluminum and potassium in cesium-containing aluminum brazing flux, and belongs to the technical field of chemical detection and analysis. The detection method provided by the invention comprises the following steps: S1, adding water into a cesium-aluminum-containing brazing flux sample, uniformly mixing, then adding concentrated nitric acid with the volume of V1 and perchloric acid with the volume of V2, boiling to concentrate the total volume to V2, cooling, diluting, and filtering to obtain a to-be-detected solution; and S2, respectively analyzing the concentration of the aluminum element and the concentration of the potassium element in the to-be-detected liquid at the wavelength of 396.150-396.154 nm and the wavelength of 766.488-766.494 nm by adopting an inductively coupled plasma emission spectrometry to obtain the aluminum content and the potassium content in the cesium-containing aluminum soldering flux sample. The detection method provided by the invention solves the problems of instrument corrosion caused by high fluorine in the aluminum soldering flux, serious cesium matrix interference and low determination accuracy, and is high in accuracy, good in precision and high in sensitivity.

This invention belongs to the field of industrial wastewater treatment and industrial solid waste resource utilization technology, specifically a method for the co-treatment of lithium smelting slag and tungsten smelting wastewater with high fluoride, phosphorus, and arsenic content. The method includes the following steps: S1, mixing lithium smelting slag with dilute acid, followed by stirring, filtration, washing, drying, and grinding to obtain activated slag; S2, mixing the activated slag with dilute alkali, followed by hydrothermal reaction, filtration, washing, and drying to obtain modified slag; S3, adding the modified slag to the acid-adjusted tungsten smelting wastewater, followed by stirring and filtration to obtain fluoride, phosphorus, and arsenic-free wastewater. This invention innovatively transforms lithium smelting slag into a highly efficient adsorption-precipitation material through "acid activation-alkali modification," solving the environmental risks of lithium slag stockpiling and realizing the high-value utilization of lithium slag into environmentally friendly materials, while avoiding the secondary pollution problems caused by the use of chemical agents in traditional processes.

The present disclosure provides a process for reforming hydrocarbons by using a series of adiabatic reactors and catalysts, wherein the catalyst in the at least one front or upstream catalyst bed or reactor comprises a fluoride concentration higher than the corresponding halide concentration in the catalyst in the one or more downstream catalyst beds or reactors, a chloride concentration higher than the corresponding halide concentration in the catalyst in the one or more downstream catalyst beds or reactors, or both, the process has unexpectedly been found to extend the service life and / or selectivity of the catalyst system.

The present invention discloses a treatment process for alkaline fluorine-containing wastewater, and relates to the technical field of wastewater treatment. The process comprises the following steps: adjusting the pH value of fluorine-containing wastewater to 3-6 to obtain pre-treated wastewater; adding a multi-level adsorbent to the pre-treated wastewater, wherein the dosage of the multi-level adsorbent is 3.5-6g / L, and after shearing treatment for 60-150min at a shear rate of 5400-5600r / min, precipitation and water outlet are obtained to obtain a first-level water outlet; the multi-level adsorbent includes the following components in parts by weight: 90-120 parts of goethite, 30-60 parts of A-type zeolite molecular sieves containing sodium ions, and 5-10 parts of nano-hydroxyapatite; adding activated diatomaceous earth and / or fly ash to the first-level water outlet, stirring evenly, mixing with polyacrylamide, precipitation, water outlet, and obtaining a second-level water outlet; after the second-level water outlet is adsorbed by an ion exchange resin, water outlet is obtained to complete the treatment. The treatment efficiency of fluorine-containing wastewater with a high fluoride content is improved.

The invention discloses a treatment system for FPSO pipeline chemical cleaning waste liquid and application of the treatment system. The system comprises a nitrous nitrogen reduction and removal device, a chemical precipitation defluorination device, a chemical deep precipitation defluorination device, a stripping ammonia nitrogen removal device, an ammonia gas absorption device, a circulating adsorption defluorination water tank, a first electrolytic circulating water tank and a second electrolytic circulating water tank which are sequentially connected, and the circulating adsorption defluorination water tank is connected with the adsorption defluorination device to synergistically remove fluorine. The first electrolytic circulating water tank is connected with the first electrochemical unit to synergistically degrade COD and ammonia nitrogen, the second electrolytic circulating water tank is connected with the ion exchange nitrate nitrogen removal device to synergistically secondarily degrade COD and ammonia nitrogen, and the ion exchange nitrate nitrogen removal device is connected with the ion resin reclaimed water-second electrochemical treatment unit. Through optimal combination of physical air stripping, chemical reduction, multi-stage precipitation, electrochemical oxidation and ion exchange, collaborative and deep removal of specific pollutants such as high ammonia nitrogen, high fluoride, high organic matters and high nitrogen-containing salts is realized, and the effluent of the system is stable and reaches the standard.

This invention discloses a method for preparing a denitrifying mineralization functional strain-calcium-rich biochar composite agent and its application in fluoride pollution remediation, belonging to the field of wastewater treatment and soil improvement technology. The preparation method includes: (1) targeted screening of strains: through the gradient increase of nitrogen source and fluoride stress and the control strategy of trace elements, strains with high fluoride tolerance, strong denitrification and efficient mineralization are screened; (2) preparation of calcium-rich carrier: using waste animal bones as raw materials, calcium-rich biochar carriers with slow-release calcium, pH buffer and high specific surface area are prepared; (3) construction of composite agent: the bacterial suspension is mixed with the carrier to form a high-density active biofilm. The composite agent is used for the remediation of fluoride-containing groundwater, and the effluent meets the Class III standard of groundwater; when used for the remediation of modified phosphogypsum backfill, the fluoride concentration of leachate is less than 1.0 mg / L. This invention achieves stable remediation of fluoride pollution through the synergistic effect of bacteria and biochar, and has the advantages of being green and low-carbon, low cost and outstanding engineering potential.

This disclosure provides processes for reforming hydrocarbons by using a series of adiabatic reactors and catalysts, in which the catalyst(s) in at least one front or upstream catalyst bed or reactor includes a higher fluoride concentration, higher chloride concentration, or both than the respective halide concentrations in the catalysts in one or more downstream catalyst beds or reactors, which has been unexpectedly discovered to extend the useful life and / or the selectivity of the catalyst system.

This application relates to the field of fluoride-containing wastewater treatment technology, and particularly to a system and method for recovering fluorides from fluoride-containing wastewater. The system includes a raw material zone, a sedimentation zone, and a detection zone. The raw material zone includes a first feeding unit for storing the fluoride-containing wastewater and a second feeding unit for storing a precipitant solution. The sedimentation zone includes a sedimentation chamber, and the detection zone includes a detection chamber, the bottom of which is connected to the top of the sedimentation chamber. Fluoride seed crystals are present in the sedimentation chamber. The first feeding unit delivers the fluoride-containing wastewater to the bottom of the sedimentation chamber, and the second feeding unit delivers the precipitant solution to the bottom of the sedimentation chamber. The fluoride-containing wastewater and the precipitant solution mix to form a mixed solution, which then reacts on the surface of the fluoride seed crystals to form fluoride crystals. The detection chamber is used by an operator to detect the fluoride content and turbidity in the mixed solution and to discharge the supernatant. When the reaction is complete, the fluoride crystals in the sedimentation chamber are removed. This system for recovering fluorides from fluoride-containing wastewater exhibits high fluoride recovery efficiency and quality.

Improvement of the light emission characteristics of fluoride phosphors, specifically improvement of the external quantum efficiency. 【Solution means】 Fluoride phosphor particles having a composition represented by the general formula (1): A2M (1-n) F6:Mn 4+ n In the general formula (1), element A is one or more alkali metal elements containing K, element M is Si alone, Ge alone, or a combination of one or more elements selected from the group consisting of Si and Ge, Sn, Ti, Zr, and Hf, and 0 < n ≤ 0.1. For these fluoride phosphor particles, using an electron probe microanalyzer manufactured by JEOL Ltd., product number: JXA-8230 and the attached software, with an acceleration voltage of 15 kV, an irradiation current of 5 × 10 -8 A, the value Pc of the Mn level near the center of the fluoride phosphor particles, determined from cross-sectional elemental analysis under the conditions of a measurement time of 30 ms, a measurement area size of 160 × 160 μm, and 400 × 400 pixels of the number of measurement points, is 36 to 58.

This application belongs to the field of wastewater treatment technology, specifically relating to a recycling and treatment process for organic fluoride-containing wastewater. The invention employs a stepped treatment process: Fenton pre-oxidation treatment—anaerobic biological treatment—aerobic biological treatment—deep adsorption with mixed metal oxides, efficiently and systematically removing fluoride ions from organic fluoride-containing wastewater. Using magnesium-aluminum composite oxides or lanthanum-zirconium-doped magnesium-aluminum composite oxides as adsorbents allows for precise removal of fluoride ions, unaffected by interference from other ions, effectively improving the fluoride ion removal rate. The use of lanthanum and zirconium-doped magnesium-aluminum composite oxides ensures that the resulting lanthanum-zirconium-doped magnesium-aluminum composite oxides maintain high fluoride removal activity over a wide pH range of 3-9, effectively reducing the cost of wastewater treatment.

The present invention discloses a chlorine-nitrogen co-coordinated single-atom zirconium adsorbent and its application in selective fluoride removal in high-salt wastewater, belonging to the technical field of fluoride-containing wastewater treatment. The present invention self-assembles melamine and cyanuric acid to obtain a supramolecule, and then ball-mills the supramolecule with zirconium chloride and pyrolyzes it twice to obtain a chlorine-nitrogen co-coordinated single-atom zirconium adsorbent. The adsorbent selectively captures low-concentration fluoride ions in high-salt wastewater by applying a strong electrostatic repulsion to oxygen-containing acid radicals by negatively charged nitrogen ligands and a strong coordination effect to fluoride ions by positively charged zirconium atoms. The adsorbent prepared by the present invention not only has the advantages of high fluoride removal capacity and strong salt tolerance compared with traditional adsorbents, but also can overcome the defects of conventional chemical precipitation, coagulation and flocculation methods such as large dosage of reagents, high hazardous waste output, and high treatment cost, and has broad application prospects.

The invention relates to the technical field of water treatment, and discloses a reinforced coagulation method for synergistically removing fluorides and high-toxicity disinfection byproducts in polluted underground water. The method comprises the following steps: (1) taking a water sample to be treated from underground water to be treated, detecting the initial fluorine ion concentration and the initial DOC content of the water sample to be treated, and adjusting the pH value to 4.5-5.5 to obtain a treated water sample; (2) adding a zirconium salt coagulant into the treated water sample, carrying out pre-coagulation treatment, and detecting the pH value of the pre-coagulated effluent; (3) adding lime milk or calcium oxide into the water sample obtained in the step (2) to adjust the pH value of the water sample obtained in the step (2), and recording the addition amount of the lime milk or calcium oxide; and (4) adding the zirconium salt coagulant and the slaked lime solution into the underground water to be treated, and performing coagulation treatment. The method provided by the invention has the advantages of easily available raw materials, high fluoride removal rate, good toxicity reduction effect of high-toxicity disinfection byproducts, high DOC removal rate and good UV254 removal effect.

This disclosure provides a method for reforming hydrocarbons using a series of adiabatic reactors and catalysts, wherein the catalyst in at least one upstream or front-end catalyst bed or reactor comprises a higher concentration of fluorides, a higher concentration of chlorides, or both than the corresponding halide concentrations in the catalysts of one or more downstream catalyst beds or reactors. It has been unexpectedly found that the method extends the lifespan and / or selectivity of the catalyst system.

The application provides a scale inhibitor for fluoride scale and a preparation method thereof, characterized by the following raw material components in percentage by weight: sodium ethylenediaminetetramethylene phosphonate: 15-30%; diethylenetriamine pentaformal phosphonic acid: 15-20%; acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer: 15-20%; maleic anhydride-styrene sulfonic acid copolymer: 1-5%; vinylbenzoic acid-methyl methacrylic acid polyethylene glycol monomethyl ether ester copolymer: 5-10%; cetyl sulfobetaine: 1-5%; isothiazolinone: 1-3%; and water: the balance. The scale inhibitor has good chelation with Al 3+ , Ca 2+ , and can inhibit the combination of the scale inhibitor with crystalline anions (such as CO3 2‑ , SO4 2 , F ‑ ) into solids. Under the synergistic effect of multiple components, the scale inhibitor has good scale inhibition and dispersion effect on high fluoride water quality, and will not cause secondary pollution to a membrane system.

The present invention discloses a catalyst for fluorine-containing groundwater purification and a preparation method thereof, that is, a cordierite honeycomb ceramic is used as a matrix, γ-Al2O3 formed after calcining hydroxyapatite and pseudo-boehmite with a higher specific surface area is used as a carrier, La, Ag and Ce are used as the main active components, and one or more oxides or composite oxidations of Cu, Fe, Mn and Ba are used as co-catalysts. The preparation method of the catalyst is as follows: pseudo-boehmite powder, hydroxyapatite powder, one or more of the auxiliary agents, and deionized water are mixed into a slurry in a certain proportion, and sodium hydroxide or calcium hydroxide solution is used to adjust the pH to 9-11, the ceramic matrix is ​​immersed in the slurry, and the catalyst required for the present invention is obtained after drying and roasting. The catalyst of the present invention has high fluoride ion removal efficiency and durability, and silver ion doping can inhibit microbial growth and reproduction.

The utility model provides a device for treating sewage high fluoride, which relates to the technical field of sewage treatment, and comprises a reaction furnace, the top of the reaction furnace is fixedly connected with a furnace cover, the top of the furnace cover is fixedly connected with a blanking hopper, the inner side of the blanking hopper is rotatably connected with a blanking plate, and the inner side of the blanking plate is rotatably connected with a feeding hopper. A hopper cover is slidably connected to the top of the discharging hopper, a closed sliding plate is slidably connected to the inner side of the hopper cover, a supporting frame is fixedly connected to the top of the furnace cover, a second motor is fixedly connected to the inner side of the supporting frame, and a connecting rod is fixedly connected to the output end of the second motor. The outer side of the connecting rod is rotationally connected to the inner side of the hopper cover. According to the utility model, the stirring plate on the connecting rod rotates in the reaction furnace to stir the medicament to be combined with the sewage, so that the medicament and the sewage are more uniform until the value in the reaction furnace reaches the emission standard, the quantitative medicament feeding is realized, the waste is avoided, and the cost is saved.

The invention discloses a fluorine ion solid electrolyte material which is gamma-type NH4Sn2F5, and a preparation method of the fluorine ion solid electrolyte material comprises the following steps: S1, in an inert atmosphere, mixing SnF2 and NH4F, and grinding in a mortar to obtain a material before reaction; and S2, under the inert atmosphere condition, putting the pre-reaction material obtained in S1 and grinding balls into a ball mill, and carrying out ball milling to obtain the fluorine ion solid electrolyte material. The fluorine ion solid electrolyte provided by the invention has relatively high fluorine ion conductivity and can be used for an all-solid-state fluorine ion battery at room temperature. The preparation method has the advantages that the production cost is low, the production safety is high, the ionic conductivity can reach 10 <-3 > S.cm <-1 > at the room temperature, and an all-solid-state fluorine ion battery can be used at the room temperature.

The invention discloses a process and a system for deeply treating high-concentration fluorine-containing wastewater. The process comprises a first-stage defluorination reaction process section, a second-stage defluorination reaction process section and a third-stage defluorination reaction process section which are arranged in sequence, the first-stage defluorination reaction process section adopts a chemical precipitation method to perform first-stage defluorination, the second-stage defluorination reaction process section adopts a coagulation precipitation method to perform second-stage defluorination, and the third-stage defluorination reaction process section adopts an electric flocculation method to perform third-stage defluorination. According to the method, the chemical precipitation method is used for primary fluorine removal, so that the high-fluorine-content wastewater is changed into the low-concentration fluorine-containing wastewater, then the coagulating precipitation method is used for further removing fluorine ions, and finally the electric flocculation method is used for deep fluorine removal, so that the problem that the fluorine ion concentration of the effluent is difficult to reach 1.5 mg / L or below after the high-fluorine-content wastewater is treated in the prior art can be solved. The amount of sludge generated by the electric flocculation method is relatively small, no coagulant aid needs to be additionally added, and the content of Al ions in effluent can be obviously reduced.