9 results about "High fluoride" patented technology

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 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 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 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 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.