90 results about "Iron fluoride" patented technology

The invention discloses a separation and purification method of electrolytic aluminum scraps, characterized by comprising the following steps of: crushing electrolytic aluminum scraps in a wet type, floating and magnetically separating, firstly removing iron and silicon and separating to obtain carbon powder and another raw material A; and putting the raw material A in an electric furnace, electrifying to dissolve fluoride salt, restoring harmful impurities in the scraps into an elementary substance metal state by utilizing metal aluminum, precipitating at the bottom of the electric furnace and secondarily removing the iron and the silicon to obtain an electrolyte B. The invention has the advantages that metal aluminum particles in electrolytic aluminum scraps in the electric furnace is utilized as a low-cost reducing agent to restore and precipitate iron, silicon and other harmful impurities at the bottom of the furnace when the fluoride salt is in a dissolved state so as to solve the problem that iron fluoride with high stability is hard to remove, and the reducing agent is utilized in the floatation process to improve the magnetic separation effect. For a product obtained in an electric furnace melting system, an acid-method process is adopted to convert alumina into cryolite, thirdly remove silicon and obtain a byproduct of ammonium bicarbonate.

The invention provides an interface protection structure and a preparation method thereof and a battery comprising the interface protection structure. The interface protection structure comprises a metal fluoride and a binder. The metal fluoride is one or more of nickel fluoride, manganese fluoride, iron fluoride, titanium fluoride, copper fluoride, tin fluoride, and the like. The structure can form a protective layer containing lithium fluoride during the cycle process of lithium metal batteries to protect lithium metal electrodes. The interface protection structure is prepared by the following method: (1) providing a mixed slurry comprising a metal fluoride, a binder, a solvent and/or a carbon material; (2) coating one side of a diaphragm with the mixed slurry to obtain a diaphragm containing a first coating; and (3) baking the diaphragm containing the first coating to obtain the interface protection structure.

The invention discloses a method and an apparatus for preparing fumed silica from coal gangue. The method comprises: performing pressurized reaction, in microwave fields, on activated coal gangue powder and hydrofluoric acid, converging the generated silicon tetrafluoride gas with water vapor to obtain a mixture and introducing the mixture into a micorwave-absorbing agent packed column under microwave irradiation, and performing high-temperature pyrohydrolysis reaction on the mixture to generate gas silicon dioxide and hydrogen fluoride; performing shock chilling, gathering, separating, acid-removing and purging on the generated gas silicon dioxide and hydrogen fluoride as well as unreacted water vapor to prepare a fumed silica product; separating the hydrogen fluoride gas and the water vapor from a cyclone separator and the top of an acid removing furnace, and adding the water to prepare hydrofluoric acid for recycling, wherein the fumed silica product can be used as a thickening agent, a rubber reinforcing agent and a washing assistant agent, and the like; by-products are aluminum fluoride, iron fluoride and magnesium fluoride and the like; the microwave-absorbing agent in the present invention can significantly improve the direct hydrolysis efficiency of silicon tetrafluoride; the pressurized microwave reaction can significantly increase the reaction rate and conversion rate of silicon dioxide and hydrofluoric acid; and the microwave-absorbing agent is recycled and easy to regenerate, and has a high utilization rate, a simple process and low preparation cost.

The invention discloses a high-capacity fluoride/porous carbon composite positive electrode material and a preparation method thereof. A nano iron fluoride/porous carbon composite material is obtainedby taking iron fluoride and porous carbon as raw materials through steps of firstly mixing to prepare an iron fluoride/porous carbon compound; then carrying out no less than one time of solvent spraying-vacuumizing-drying treatment on the iron fluoride/porous carbon compound. By controlling the pore diameter of the porous carbon, a compounding ratio and the number of times of treating, the embedding mount of iron fluoride can be flexibly adjusted, so that the nano iron fluoride/porous carbon composite material prepared by the preparation method has the characteristics of simplicity and high efficiency; special experiment equipment and devices are not needed and amplified production is easy to generate; the high-capacity fluoride/porous carbon composite positive electrode material has a wide application prospect in the field of lithium-ion batteries. Meanwhile, after the fluoride/porous carbon composite positive electrode material designed and prepared by the preparation method is subjected to 200 circles of charging-discharging circles under the current density of 200mA/g, the reversible specific capacity is greater than or equal to 116mAh/g.

The invention relates to a preparation method for a yttrium iron fluoride doped lithium manganese phosphate--carbon composite cathode material. The chemical formula of the yttrium iron fluoride doped lithium manganese phosphate is LiMn1-x-y FexYyP1-zFzO4, wherein the x equals to 0.2-0.3; the y equals to 0.01-0.025; the z equals to 0.05-0.15.The preparation method comprises the following steps: (1) preparing the yttrium iron fluoride doped lithium manganese phosphate; (2) preparing conductive carbon dispersion; mixing ytterbium magnesium doped lithium manganese phosphate precursor with the conductive carbon dispersion to obtain a mixture; after ball milling and drying, placing the mixture in a mixed atmosphere of argon and acetylene; sintering and obtaining the yttrium iron fluoride doped lithium manganese phosphate-carbon composite cathode material; according to the invention, rare earth element Y and transitional element Fe are doped in the lithium manganese phosphate composite material, so as to replace part of M n; F is doped to replace part of P for modification and improvement to the electronic conductivity and physical activity; then, coating carbon black and a carbon nanotube mixed carbon network wrap the surface of the lithium manganese phosphate composite cathode material so as to further improve the electrical conductivity and cycling stability.

The invention discloses a method for one-step synthesis of iron fluoride/C, and belongs to the technical field of lithium ion batteries. The method disclosed by the invention comprises the following steps of fully mixing and grinding ferrous oxalate and excessivepowdered polytetrafluoroethylene, loading a uniform mixture in an aluminum oxide crucible, and roasting the uniform mixture in an argon environment, wherein the roasting temperature is 500-650 DEG C, and the temperature is maintained for 1-3 hours; cooling the uniform mixture with a furnace to a room temperature after roasting to obtain a roasted product, namely iron fluoride/C; and taking out the product, and grinding the product to obtain fine nanometer iron fluoride/C powder. The nanometer iron fluoride/C prepared according to the method has the advantages that the particle size is small and uniform, and iron fluoride is closely wrapped by carbon; and the heat preservation time in the roasting process is relatively short, and uniform and fine particles are ensured and are prevented from growing up.

The invention relates to a silver vanadate-lithium iron phosphate composite anode material preparation method. The method comprises the following steps: (1) preparing silver vanadate; (2) mixing lithium acetate and ammonium phosphate, using water to dissolve the mixture, sequentially adding citric acid and acetone, stirring to be sol, adding glucose into the sol, adding ferric hydroxide of which the molar amount is equal to the lithium molar amount and a reducing agent, namely lamp black, uniformly mixing the mixture, performing vacuum drying on the mixture, and performing ball milling on the mixture to prepare a lithium iron phosphate precursor coated by carbon; and (3) mechanically mixing the silver vanadate and the lithium iron phosphate precursor uniformly to be placed into a vacuum reaction furnace for sintering, then performing cooling, and obtaining a product after ball milling. According to the vanadate-lithium iron phosphate composite anode material for a lithium ion battery, a ferric fluoride material with high discharge capacity is subjected to cobalt doping modification to improve the conductivity of the ferric fluoride material, then is compound with a silicon doping graphene material with good conductivity and stability, so that the vanadate-lithium iron phosphate composite anode material has the characteristics of high capacity and high cycle stability.

The invention belongs to the field of preparation of functional materials, and especially relates to a method for preparing an outer wall-fluorinated multi-walled carbon nanotube containing an iron fluoride intercalated substance. The problems of too low electric conductivity and volume expansion of multi-walled carbon nanotubes with the polarization in the charge and discharge process are solved.The end caps of a multi-walled carbon nanotube are opened, the multi-walled carbon nanotube is purified, iron fluoride is used to carry out intercalation in a heating reactor which can be vacuumized,hydrogen fluoride is sued to convert the iron chloride into iron fluoride, and fluorine gas is used to properly fluorinate the multi-walled carbon nanotube in order to finally form a compounded multi-walled carbon nanotube with the outer wall being fluorinated to a certain degree, the interlayer being iron fluoride and the inner layer having a certain electric conductivity. The method enables theabove material to provide a high output voltage and a theoretical specific capacity through the outer wall fluorination and the iron fluoride interlayer, and keeps the electric conductive of the inner wall of the material as possible, so the material is suitable for being used as a novel lithium battery positive electrode material.

The invention relates to a hydrofluoric acid wastewater treatment method for treating wastewater after etching glass substrates. According to the invention, acid, calcium salt and calcium hydroxide are added to the wastewater in order to deposit fluoride ions and form calcium fluoride deposit. Coagulant aids containing salt and aluminum salt are added together with acid to form iron fluoride and aluminum fluoride deposit, and the result solution is naturalized. Polymer coagulant aids are added to form slug and the result solution is filtered to reduces the concentration of fluoride ion in the wastewater to a few hundredth. The method is environmental friendly and lowers wastewater treatment cost.

The invention relates to a lithium ion battery anode composite material, which comprises a plurality of iron fluoride particles and a plurality of carbon nanotubes. The plurality of iron fluoride particles and the plurality of carbon nanotubes form a three-dimensional conductive network, wherein the plurality of carbon nanotubes are uniformly dispersed among the plurality of iron fluoride particles, and at least parts of the iron fluoride particles are connected through the carbon nanotubes. The invention also provides a preparation method of the anode composite material. The method comprises the steps of: providing a carbon nanotube raw material and an HF solution; dispersing the carbon nanotube raw material in the HF solution to form a first suspension solution; providing an FeCl3 solution, and mixing the FeCl3 solution with the first suspension solution to obtain a precipitate FeF3.3H2O-CNTs; and subjecting the precipitate to separation and purification, and carrying out heat treatment on the precipitate, thereby obtaining the lithium ion battery anode composite material.

It was found that a refrigerant mainly containing a carbon-carbon double bond-containing hydrofluoroolefin has a function to suppress abrasive wear, compared to conventional HFC-based refrigerants, because the hydrofluoroolefin generates iron fluoride especially on the surface of the vane and piston, where sliding force is severe, from hydrogen fluoride, even if it is generated in reaction with water and oxygen. It is possible to reduce abrasive wear, by using a refrigerant containing as the base component a hydrofluoroolefin as operating refrigerant and a refrigeration oil 3 miscible with the refrigerant and a vane 10 made of a high-speed tool steel and sintered and quenched, because hydrogen fluoride generated by decomposition of the refrigerant in the region of a vane tip region 10a and a piston 9 peripheral surface, where sliding force is severe is converted to iron fluoride. It is also possible to obtain a hardened structure containing carbides of W, Mo, Cr and V dispersed in a fine martensite matrix and produces the rotary compressor more cost-effectively by quenching and sintering the vane 10.

The invention discloses an iron fluoride/carbon composite positive electrode material, a preparation method thereof and a lithium ion battery. The method comprises the following steps of: (1) reacting steam of a fluorine source and steam of a carbon-containing organic matter with an iron source to prepare a precursor; and (2) carrying out heat treatment on the precursor to obtain the iron fluoride/carbon composite positive electrode material. A fluorine source and a carbon source are introduced through gas-phase reaction, the powder morphology is controlled, and the high-performance iron fluoride positive electrode material is obtained. The lithium ion battery positive electrode material provided by the invention has the advantages of high reversible specific capacity and good cycling stability.

The invention discloses an iron lithium fluoride battery anode material prepared by a nitrogen-doped silicon carbide-assisted solid phase one-step process and a preparation method. The preparation method is characterized in that nitrogen-doped silicon carbide is adopted as a ball milling auxiliary, a conductive agent and a surface modifier at the same time in a preparation process; after the ball milling of a certain period of time and thermal treatment by a high-energy ball mill, the raw material is directly supplied to a battery production enterprise for coating production, thereby greatly reducing the intermediate steps, lowering the production cost and avoiding any waste liquid; the prepared FeF3 anode material has a stable capacity over 200mAh.g<-1> and a good multiplying power feature; iron salt containing crystal water and ammonium fluoride at a molar ratio of 1.0:(3.0-3.6), 3-15% of nitrogen-doped silicon carbide by weight and 0.5-3.0% of auxiliary by weight are subjected to normal-temperature ball milling for 5-20 hours under the atmosphere protection in the high-energy ball mill; then the material is taken out and heated to 300-450 DEG C under the protection of the mixed gas of 5% of hydrogen and 95% of argon, and the temperature is kept for 2-10 hours before cooling to obtain the FeF3 anode material which can be directly applied to slurry coating.

The invention relates to a Cu<2+>, Ce<4+>, Ag<+> doping modified iron fluoride positive pole material and a preparation method thereof. The method comprises the following step: performing ball milling on copper salt, cerium salt, silver salt and synthesis raw materials in a high-energy ball mill for a certain time, and performing heat treatment to obtain the FeF3 positive pole material. The Cu<2+> partially occupies iron ions of FeF3 for coordination, thereby being beneficial to increase the discharge potential and improve the energy density; the high-valence Ce<4+> is doped, thereby being beneficial to increase the specific capacity of the material; and the Ag<2+> is doped, thereby reducing the conversion reaction activation energy during charge. Thus, the invention is beneficial to improve the rate characteristic and energy density, thereby improving the comprehensive electrochemical property of the material.

The invention discloses a carboxyl carbon, titanate and doped titanium lithium phosphate three-component surface modified iron fluoride cathode material and a preparation method thereof. The preparation method is characterized by comprising the following steps: ball-milling carboxyl carbon, titanate and silicon/aluminum-doped titanium lithium phosphate Li1.3Al0.1Ti1.9Si0.2P2.8O12 as well as a synthetic raw material in a high-energy ball mill for a period of time, and carrying out heat treatment to obtain the FeF3 cathode material. Carboxyl carbon coordinates with FeF3 iron ions through carboxyl to form firm bonding; carboxyl carbon is a good electron conductor and is helpful for forming a complete conductive link; Li1.3Al0.1Ti1.9Si0.2P2.8O12 is a good lithium ion conductor; a complete lithium ion conductive link is formed for guaranteeing Li1.3Al0.1Ti1.9Si0.2P2.8O12 to be closely contacted with the FeF3 material through lone pair electrons; the electron conductor-carboxyl carbon and the lithium ion conductor-Li1.3Al0.1Ti1.9Si0.2P2.8O12 are bonded on the FeF3 particle surface by coordinating and bonding reactive groups-fluorine ions of titanate with titanium ions, hydrolyzing alkoxy into hydroxy and bonding hydroxy with Li1.3Al0.1Ti1.9Si0.2P2.8O12, so that a complete electron and ion conductive link is formed, the ion conductivity and the electron conductivity of the FeF3 material are greatly improved, and the electrochemical performance of the material is improved.