69results about "Magnesium fluorides" patented technology

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

The invention belongs to the technical field of sodium-ion battery positive electrode material preparation, and particularly discloses a double-modified sodium-ion battery layered oxide positive electrode material and a preparation method thereof, and the preparation method comprises the following steps: S1, synthesizing a P2-type sodium-ion battery nickel-manganese-based layered oxide by using a high-temperature solid-phase method; s2, uniformly mixing two or more of lithium fluoride, sodium fluoride, calcium fluoride or magnesium fluoride in proportion to prepare a multi-element fluoride coating material; and S3, uniformly mixing the P2-type sodium-ion battery nickel-manganese-based layered oxide and the multi-fluoride coating material according to a ratio, and then carrying out high-temperature quenching treatment to obtain the surface fluoride-coated and near-bulk-phase-doped dual-modified sodium-ion battery layered oxide positive electrode material. According to the dual-modified layered oxide positive electrode material for the sodium-ion battery and the preparation method, surface fluoride coating and near bulk phase doping are cooperatively utilized, so that the high-voltage cycle performance of the layered oxide positive electrode material for the sodium-ion battery is improved.

The objective of the present invention is to provide a method for producing a core-shell particle without requiring the synthesis of a core particle and the adjustment of the electric charge of the surface of the core particle, and to provide a method for producing a hollow particle without requiring thermal energy in a hollowing step of the core-shell particles. The method for producing the core-shell particle according to the present invention includes a step for forming a shell by directly fluorinating the surface layer of a core particle consisting of a magnesium inorganic salt. Next, the method for producing a hollow particle of a fluoride includes a step for removing only the core particle with an acid from the core-shell particle obtained by the above-mentioned producing method.

To provide a fluoride ion battery that can achieve a high charge-discharge capacity.SOLUTION: A fluoride ion battery of the present disclosure has a positive electrode active material layer, a negative electrode active material layer, and an electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer. In the fluoride ion battery of the present disclosure, the negative electrode active material layer contains magnesium metal, magnesium fluoride, and calcium barium fluoride, and the mass ratio of the magnesium metal to the magnesium fluoride is 0.1-10.0.SELECTED DRAWING: Figure 1

The present invention provides a method for recovering and preparing high-purity magnesium fluoride from fluorine-containing solid waste, comprising: mixing the fluorine-containing solid waste with magnesium sulfate and then performing a wet ball milling process, putting the obtained wet-milled conversion residue into a sodium hydroxide solution for alkali leaching and then filtering to obtain an alkali-leached conversion residue and an alkali-leached conversion solution; performing acid leaching on the alkali-leached conversion residue to obtain an acid leached solution, performing a magnesium ultrasonic extraction process on the acid leached solution, and performing a magnesium ultrasonic back extraction process on the obtained magnesium-loaded organic phase to obtain a magnesium-free organic phase and a magnesium sulfate solution; acidifying the alkali-leached conversion solution and then filtering to obtain an acidified solution, performing a fluorine extraction process on the acidified solution to obtain a fluorine-loaded organic phase, and using the magnesium sulfate solution as an anti-extraction agent to perform a fluorine back extraction process on the fluorine-loaded organic phase to obtain magnesium fluoride. The method adopted by the present invention can efficiently separate calcium and magnesium in the fluorine-containing solid waste, convert the fluorides in the fluorine-containing solid waste into high-purity magnesium fluoride, and realize the recycling of fluorine and magnesium resources in the fluorine-containing solid waste.

The present invention provides a post-treatment method for improving the purity of K / NaMgF3 particles, particularly relating to the field of chemistry. The method comprises the following specific steps: (1) placing K / NaMgF3 particles in an aqueous solution and stirring and dissolving them thoroughly; (2) adding a fluoride salt and a buffer to the solution treated in step (1) and stirring thoroughly; (3) adding a magnesium salt and a chloride salt to the solution treated in step (2) and stirring thoroughly; and (4) pouring out the residual solution treated in step (3) and drying the residual solid in step (4). The K / NaMgF3 of the present invention remains unchanged and does not introduce new impurities. The method can remove MgF2 impurities while neither destroying the structure of K / NaMgF3 nor introducing new impurities. The steps are closely related, and no intermediate rinsing or treatment is required. The process is simple, and while ensuring efficient impurity removal, energy conservation and environmental protection are also taken into account. The method is applicable to various K / NaMgF3 preparation methods, does not use toxic and hazardous substances, and has low waste liquid treatment costs.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

This invention relates to the field of co-processing and resource utilization of fluorine- and silicon-containing solid waste, specifically disclosing a high-quality, tiered resource utilization process for fluorosilicone slag. This process uses fluorosilicone slag as raw material, sequentially undergoing alkali dissolution activation, acidification polymerization, primary defluorination crystallization, secondary deep defluorination, and salt resource recovery steps to produce washed silica, magnesium fluoride, cryolite, and sodium sulfate, while simultaneously achieving mother liquor recycling and wastewater reduction. This invention features a short process flow, closed-loop material circulation between units, and a SiO2 recovery rate of over 95% in the fluorosilicone slag. The silica, magnesium fluoride, cryolite, and sodium sulfate products meet relevant national or industry standards, achieving high-quality, tiered resource utilization and overall wastewater reduction for fluorosilicone slag.

An apparatus for treating a fluid including an organofluorine compound, the apparatus including: a vessel that contains a liquid with a fluoride bonding agent; a combustion chamber in fluid communication with the vessel via an outlet submerged in the liquid; an inlet configured to introduce the fluid into the combustion chamber; and a flame source configured to produce a flame in the combustion chamber to at least partially break down the organofluorine compound to form a gaseous combustion product bearing fluoride, wherein the gaseous combustion product passes from the outlet of the combustion chamber through the liquid so that the fluoride in the gaseous combustion product is at least partially bound by the fluoride bonding agent.

The invention discloses a method for recovering valuable elements in liquid obtained after bauxite wet desulphurization, and relates to the technical field of bauxite resource utilization. Comprising the following steps: carrying out ceramic membrane filtration pretreatment on the bauxite wet desulfurization liquid to remove impurities; the silicon element is recycled in a targeted manner through a compound flocculation-calcination process to obtain the white carbon black; the iron element is recycled through ozone oxidation-ammonium bicarbonate precipitation, and high-purity iron oxide is prepared; separating and purifying an aluminum element through a seed crystal induction-calcination process to obtain metallurgical-grade aluminum oxide; a fluorine-containing precipitant is used for selectively precipitating and recovering magnesium element to obtain a high-quality magnesium salt product; and neutralizing the tail liquid, and discharging after reaching the standard. According to the method, accurate separation and high-valued utilization of four elements of aluminum, iron, silicon and magnesium are realized through a synergistic process of targeted recovery of silicon, gradient separation of iron and aluminum and selective precipitation of magnesium, and the problems of silicon resource waste, low element separation efficiency, insufficient product purity, secondary pollution and the like in a traditional process are thoroughly solved; all-component resource comprehensive utilization of desulfurized liquid resources is achieved.

The invention relates to the technical field of fluorine-containing and silicon-containing solid waste co-processing and resource utilization, and particularly discloses a fluorine-silicon slag gradient high-quality recycling process. According to the process, the fluorine-silicon slag is used as a raw material and is sequentially subjected to the steps of alkali dissolution activation, acidification polymerization, first-stage fluorine removal crystallization, second-stage deep fluorine removal and salt resource recovery, products such as washed white carbon black, magnesium fluoride, cryolite and sodium sulfate are prepared, and meanwhile mother liquor recycling and wastewater reduction are achieved. According to the method, the technological process is short, closed-loop circulation of materials is achieved among the units, the recovery rate of SiO2 in the fluorosilicon slag can reach 95% or above, white carbon black, magnesium fluoride, cryolite and sodium sulfate products meet relevant national or industrial standard requirements respectively, and gradient high-quality recycling and whole-process reduction of the fluorosilicon slag are achieved.

To provide a positive electrode active material for a lithium secondary battery, which has excellent cycle characteristics under high voltage and can reduce impedance.SOLUTION: A positive electrode active material for a lithium secondary battery is composed of a mixture of aluminum-containing lithium cobalt composite oxide particles and inorganic fluoride particles, and the aluminum-containing lithium cobalt composite oxide particles have aluminum present in a solid solution at least inside the aluminum-containing lithium cobalt composite oxide particles, and the inorganic fluoride particles are compounds containing MgF2, Al, and F.SELECTED DRAWING: Figure 1

The invention relates to a method for treating aluminum electrolysis hazardous waste by using magnesium oxide, which comprises the following steps: carrying out pretreatment such as crushing and screening on the aluminum electrolysis hazardous waste, and then mixing with a proper amount of magnesium oxide; and adding ammonia water into the prepared alkaline solution, selectively leaching the mixed material, and filtering to obtain a lithium-containing leachate and a magnesium fluoride product. An alkaline solution serves as a leaching agent, magnesium oxide serves as a fluorine trapping agent, ammonia water serves as a magnesium ion activating agent, efficient treatment of fluorine and lithium resources in the waste aluminum electrolyte is achieved, lithium enters a liquid phase to be recycled, magnesium, fluorine and the like enter a slag phase in the form of magnesium fluoride, the purity is high after weak acid washing, and the waste aluminum electrolyte can be directly sold.

The invention relates to the field of industrial environmental protection and resource circulation, in particular to a method for co-processing perfluorinated / polyfluoroalkyl compound polluted water based on an industrial high-temperature process and an industrial symbiotic treatment system. The method comprises the following steps: taking the polluted water containing perfluoro and / or polyfluoroalkyl compounds as a water source of an original process in an industrial high-temperature production process, and introducing the polluted water into a raw material system in the industrial high-temperature production process through a liquid adding process node so as to mix the polluted water with raw materials; and feeding the raw material mixed with the polluted water into a high-temperature treatment process section of an industrial high-temperature production process for pyrolysis treatment. The PFAS polluted water is seamlessly embedded into the production process of the main product by searching and utilizing inherent process conditions of high temperature, alkali metal / alkaline earth metal and acceptable liquid which can be shared in the existing high-energy-consumption industrial process, so that the PFAS polluted water is seamlessly embedded into the production process of the main product on the premise of no negative influence on the quality of the main product. The efficient removal of PFAS pollutants and the in-situ fixation of fluorine elements are synchronously realized.

A ceramic-like structure includes: a transparent substrate; an ink layer; and a ceramic-like film layer. The ceramic-like film layer is disposed between the transparent substrate and the ink layer, and includes a first high-refractive-index material layer, a first low-refractive-index material layer, a second high-refractive-index material layer, and a second low-refractive-index material layer that are stacked on each other. Refractive indexes of the first high-refractive-index material layer and the second high-refractive-index material layer are greater than about 2.3, and refractive indexes of the first low-refractive-index material layer and the second low-refractive-index material layer are less than about 1.6.

The invention belongs to the technical field of optical crystal preparation, and provides a magnesium fluoride crucible descending type directional crystallization purification method for ultraviolet optical crystal manufacturing. Magnesium fluoride raw materials are placed in a vacuum furnace to be subjected to desorption pretreatment, then the raw materials are fused, subjected to heat preservation and homogenized, first-process directional crystallization is achieved through descending displacement of a crucible relative to a hot area, a first ingot body is obtained, impurities are enriched towards the tail end along with the crystallization process, and only a local section of the enriched end is heated and remelted to form a controlled molten pool; the middle-section main body is kept in a solid state; the temperature gradient direction is reversed by switching the power ratio of a heating area, the molten pool is subjected to second-process directional crystallization in the opposite direction to form a second ingot body, the second ingot body is axially cut in a segmented mode, a middle purification section is reserved to serve as a high-purity raw material, and the middle purification section can be repeatedly executed in the same furnace to obtain a raw material section; according to the method, segregation enrichment and reverse ending are completed in a clean atmosphere, and the method is suitable for manufacturing magnesium fluoride crystals for ultraviolet optical elements.

A pseudo-ceramic structure includes a transparent substrate material, a pseudo-ceramic film layer, and an ink layer, the pseudo-ceramic film layer being disposed between the transparent substrate material and the ink layer, the pseudo-ceramic film layer being made from a first high refractive index material layer, a first low refractive index material layer, a second high refractive index material layer, and a second low refractive index material layer, the first high refractive index material layer, the first low refractive index material layer, the second high refractive index material layer, and the second low refractive index material layer being stacked in this order. Additionally, the present application further discloses a method for manufacturing the pseudo-ceramic structure and an electronic device housing including the pseudo-ceramic structure.

To provide a method for producing a metal fluoride by which the metal fluoride can be produced while suppressing the generation of corrosive gas, and to provide a composition.SOLUTION: A method for producing a metal fluoride, comprising a step (1) of mechanochemically treating a fluorine-containing compound and a basic metal compound containing at least one member selected from the group consisting of alkali metals and alkaline earth metals to obtain a composition containing the fluorine-containing compound and the basic metal compound, and a step (2) of heat-treating the composition to obtain a metal fluoride containing at least one member selected from the group consisting of alkali metals and alkaline earth metals.SELECTED DRAWING: None

The application discloses a closed loop process for synchronously increasing the value of silicon and fluorine components in silicon tetrafluoride, and belongs to the technical field of fluorine-containing silicon byproduct resource utilization. The steps are as follows: 1) mixing anhydrous alcohol with triethylamine, and introducing silicon tetrafluoride gas at 0-30 DEG C to generate alkyl orthosilicate and triethylamine monohydrofluoride; 2) distilling the reaction liquid to recover alcohol, performing vacuum rectification to obtain alkyl orthosilicate product, and separating to obtain triethylamine monohydrofluoride; 3) adding triethylamine monohydrofluoride into water, and performing heating reflux reaction with inorganic alkali or basic oxide to separate to obtain triethylamine crude product and fluorinated metal salt; 4) after dehydration rectification, the triethylamine crude product is recycled to step 1) with recovered alcohol; and the fluorinated metal salt is post-treated to obtain high-purity fluorinated metal salt. The process has low reaction temperature, high alkyl orthosilicate yield, recyclable triethylamine, all fluorine solidified into high-value-added products, no three-waste emissions, and can be continuously industrialized.

An optical system includes a bulk material including a fluorine (F)-containing optical material. The bulk material is exposed to an environment at a pressure ranging from atmospheric to vacuum when the bulk material is under extreme ultra-violet (EUV), vacuum ultra-violet (VUV), deep ultra-violet (DUV) and / or UV radiation. The environment includes at least one type of gas or vapor. The at least one type of gas or vapor includes polar molecules.

To provide a positive electrode active material for a lithium secondary battery, which has excellent cycle characteristics under high voltage and can reduce impedance.SOLUTION: A positive electrode active material for a lithium secondary battery is composed of a mixture of aluminum-containing lithium cobalt composite oxide particles and inorganic fluoride particles, and the aluminum-containing lithium cobalt composite oxide particles have aluminum present in a solid solution at least inside the aluminum-containing lithium cobalt composite oxide particles, and the inorganic fluoride particles are compounds containing MgF2, Al, and F.SELECTED DRAWING: Figure 1

One embodiment of the present invention relates to a porous silicon composite, a porous silicon carbon composite containing the same, and an anode active material, in which the porous silicon composite and the porous silicon carbon composite each contain both silicon particles and a magnesium compound, and have a molar ratio (O / Si) of oxygen (O) atoms to silicon (Si) atoms that satisfies a specific range, and by applying the porous silicon composite and the porous silicon carbon composite to the anode active material, it is possible to realize an excellent capacity retention rate, and to significantly improve the discharge capacity and initial efficiency.

The application discloses a method for preparing magnesium fluoride from household garbage incineration fly ash. The household garbage fly ash is subjected to acid washing / water washing to obtain aqueous fly ash slurry. The slurry is subjected to solid-liquid separation to obtain calcium and magnesium-containing crude salt water. The solid is subjected to a subsequent process. The calcium and magnesium-containing crude salt water is subjected to a heavy component removal process, and is subjected to static sedimentation. The clear liquid is subjected to a denitrification process, an oxidation process and a neutralization process, and is subjected to solid-liquid separation to obtain calcium and magnesium-containing refined salt water. The calcium and magnesium-containing refined salt water is subjected to a calcium removal process, and is subjected to solid-liquid separation to obtain refined magnesium water. The refined magnesium-containing refined salt water is subjected to a magnesium removal process by adding alkali to obtain magnesium hydroxide. The magnesium hydroxide is configured into slurry with a certain concentration, is slowly added into pretreated waste hydrofluoric acid solution, is fully stirred, is subjected to solid-liquid separation, and is subjected to three-stage countercurrent oxidation washing and then thermal desorption to obtain magnesium fluoride products.

The present invention belongs to the technical field of resource utilization of fluoride in electrolytic aluminum overhaul slag as solid waste, and specifically discloses a method for preparing aluminum-doped tubular magnesium fluoride from electrolytic aluminum overhaul slag. In the method, the overhaul slag is ground and sieved, subjected to a water bath reaction, and then filtered to obtain the magnesium fluoride; the magnesium fluoride is mixed with sodium fluoride and a solution containing aluminum ions under a chelating reaction of a chelating agent and a magnesium salt and ultrasonic conditions, and subjected to a hydrothermal reaction in a reactor for 1 to 2 hours. The magnesium fluoride is then dried in an oven and ground, and finally calcined in a tubular furnace to obtain a metal magnesium fluoride catalyst for catalytic reaction, the specific surface area of ​​which is greater than 180 m 2 / g, the prepared magnesium fluoride can be used for catalytic reactions such as dehydrochlorination reaction, fluorine-chlorine exchange reaction, hydrogenation reaction, and removal of nitrogen oxides. The specific surface area of ​​the prepared tubular magnesium fluoride is larger than that of the block magnesium fluoride, and the corresponding catalytic active sites are more, the catalytic activity is high, and the stability is strong.

The invention discloses a method for recovering ammonium and nitrogen from ardealite leachate and co-producing magnesium fluoride, which comprises the following steps: uniformly mixing the ardealite leachate and magnesium salt, then adding first ethanol, adjusting the pH value to be less than or equal to 2.5, and carrying out first stirring reaction and first solid-liquid separation to obtain a solid mixture; washing the solid mixture with water until the pH value is 6-7, and carrying out second solid-liquid separation to obtain magnesium fluoride solid and crude magnesium ammonium sulfate filtrate; and uniformly mixing the crude magnesium ammonium sulfate filtrate with second ethanol, adjusting the pH value to be less than or equal to 2.5, and carrying out second stirring reaction and third solid-liquid separation to obtain a magnesium ammonium sulfate solid. According to the composition characteristics of the ardealite leachate, ammonium nitrogen, fluorine ions, sulfate ions and magnesium salt in the ardealite leachate are directly utilized to react under an acidic condition to generate magnesium ammonium sulfate and magnesium fluoride; the method has the characteristics of simple process, strong adaptability, convenience in operation, mild reaction conditions, low treatment cost, high recovery rate of valuable components, high added value of products and the like.

The invention relates to the technical field of magnesium fluoride production, and discloses a semi-continuous high-purity magnesium fluoride synthesis device and process, the semi-continuous high-purity magnesium fluoride synthesis device comprises a first barrel body, and further comprises a second barrel body fixedly mounted at the bottom of the first barrel body; the main shaft is rotationally mounted in the first barrel body, the surface of the main shaft is rotationally sleeved with a conical disc, the interior of the conical disc is hollow, a rotary disc is rotationally mounted at the bottom in the conical disc, the rotary disc fixedly sleeves the surface of the main shaft, and the surface of the main shaft is slidably sleeved with a stirring shaft through a spline; and the mixing assembly is arranged in the first barrel body, and the mixing assembly is used for mixing the magnesite and the hydrofluoric acid. The interior of the first barrel can be in a high-pressure and low-pressure circulation state, magnesite and hydrofluoric acid liquid in the first barrel can be further mixed in an accelerated mode, and then the using effect of the equipment is improved.

A container for storing hydrogen in a solid state, having a storage body (34) made of metal for storing hydrogen in the form of metal hydride, a casing (35), which contains the storage body ((3344)) and has aann opening (36) for hydrogen injection and extraction in gaseous form, and at least one heating band (37) arranged in the thickness of the casing (35) or around the casing (35) for heating the storage body (34) so aass to allow a chemical capture rreeaaccttiioonn and a chemical rreelleeaassee reaction of the hydrogen by the storage body (34). The storage body (34) is made of magnesium doped with magnesium fluoride and has a lattice structure (38) defined by a plurality of elementary cells (39) having the same shape as a three-dimensional gyroid.

This invention provides magnesium fluoride nanomaterials and their preparation method. The preparation method includes: adding hydrofluoric acid solution in batches to a magnesium salt solution, and reacting at a temperature of 10-70°C to obtain magnesium fluoride nanomaterials. The preparation method provided by this invention uses hydrofluoric acid as the fluorine source, which can produce magnesium fluoride nanomaterials with excellent sphericity. Furthermore, the preparation method has mild reaction conditions, is simple to operate, and is suitable for industrial production. In some preferred embodiments, by controlling the reaction conditions, magnesium fluoride nanomaterials with good sphericity, dispersibility, uniformity, and relatively large particle size can be obtained.

The application provides a positive electrode material, a preparation method thereof, a positive electrode sheet, a secondary battery and an electric device. The positive electrode material comprises an inner core, a first coating layer covering at least part of the outer surface of the inner core, and a second coating layer covering at least part of the outer surface of the inner core with the first coating layer. The material of the first coating layer comprises lithium and an X element. The material of the second coating layer comprises the X element and a Z element. By forming the first coating layer, residual lithium on the surface of the inner core can be eliminated. The first coating layer has a high oxygen vacancy formation energy, which can reduce or even avoid oxygen dissolution in the inner core, reduce or even avoid the side reaction between oxygen and electrolyte due to oxygen dissolution, and improve the cycle life and safety of the secondary battery. By forming a uniform protective film on the surface of the inner core with the first coating layer, the overflow of oxygen from the position without the first coating layer can be reduced or even avoided.

The invention relates to a recovery method of glass etching waste liquid. The method comprises the following steps: (1) crystallizing and desiliconizing; (2) crystallizing to synthesize magnesium fluoride; (3) calcining magnesium fluoride at high temperature; (4) removing fluorine; and (5) crystallizing ammonium sulfate. The method aims at the glass etching waste liquid with high content of fluosilicate and sulfate, white carbon black with low water content and high purity can be prepared, magnesium fluoride and ammonium sulfate products with good filtering performance and high purity can be obtained, and the method is simple and efficient in process, low in energy consumption, environmentally friendly, high in recovery rate and suitable for industrial application.