8 results about "Ferric fluoride" patented technology

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

The invention relates to the field of thermal batteries, and discloses a FeF3 / FeOF composite positive electrode material with a heterostructure and a preparation method of the FeF3 / FeOF composite positive electrode material. The preparation method comprises the following steps: dissolving ferric salt in an alcohol reagent added with an additive, then dropwise adding an ammonium fluoride or ammonium bifluoride aqueous solution to prepare an iron trifluoride hydrate compound, and further preparing the FeF3 / FeOF thermal battery positive electrode material with a heterostructure through a roasting method. Wherein the appearance of FeOF can introduce out-phase energy level, the FeOF and FeF3 form a Schottky heterojunction, a built-in electric field of a compound interface is formed, the migration rate of electrons and ions in a material body phase is promoted, and the instantaneous discharge power is improved. In addition, the interface of the FeF3 / FeOF compound is also an important active site for storing ions, so that the specific capacity of the material is improved.

This invention discloses a method for preparing high-purity terbium-iron alloy, utilizing ferric fluoride as a chemical decalcification agent in the refining stage. Compared with existing technologies that rely solely on high-temperature volatilization and physical adsorption for calcium removal, this method provides a clear chemical driving force, converting calcium dissolved in the alloy melt into an insoluble calcium fluoride slag phase through a displacement reaction, thereby achieving efficient calcium removal. This invention can reduce the calcium content in terbium-iron alloy from 0.011-0.015% in traditional processes to 0.002-0.004%, a reduction of 70-85%. This method requires no special equipment; only the addition of ferric fluoride in the refining stage is needed, resulting in low process modification costs and good industrial applicability.

The invention relates to a method for producing a cathode active material, comprising at least partially dissolving iron fluoride trihydrate (IFH) in a polar solvent, thereby obtaining a solution; adding water to the solution, thereby precipitating a compound comprising pyrochlore hydrated iron hydroxyfluoride (Pyr-IHFH); separating the precipitated compound from the solution; and heating the separated precipitated compound to a temperature of 50-400 DEG C, thereby obtaining a cathode active material comprising pyrochlore iron hydroxyfluoride (Pyr-IHF) wherein water is added to the solution to convert the IFH into Pyr-IHFH. The invention further relates to a cathode active material comprising Pyr-IHF, a cathode comprising the cathode active material and a battery comprising the cathode.

The invention discloses a preparation method of a carbon nano island modified ferric trifluoride hydrate positive electrode material. The carbon nano island modified ferric trifluoride hydrate material is produced by adopting a wet chemical reaction-continuous anhydrous oxygen-free fluorination-oxygen-free high-speed ball milling process, and the method comprises the following steps: carrying out continuous fluorination on ferric hydroxide obtained by reacting a positive ferric ion-containing metal salt raw material with a hydroxyl-containing alkali solution by using anhydrous oxygen-free fluorine; the iron trifluoride hydrate obtained after cooling and sieving and conductive carbon are subjected to sufficient oxygen-free high-speed ball milling, the iron trifluoride hydrate material modified by the carbon nano island is obtained, the size of the material is within the range of 1-20 microns, the material is of a mottle layered structure, the size of the carbon nano island is within the range of 50-200 nm, and the material is of an island-shaped structure. The method is simple in preparation flow, controllable in process, good in stability, capable of achieving batch production and suitable for macro preparation.

Catalysts and processes for the production of 1,2-difluoroethene from 2-chloro-1,1-difluoroethane. The present application provides a supported catalyst comprising a first catalytic component selected from the group consisting of aluminum fluoride, chromium fluoride, cobalt fluoride, ferrous fluoride and ferric fluoride supported on a support, and a second catalyst component selected from the group consisting of potassium fluoride, cesium fluoride, magnesium fluoride and calcium fluoride. The present application also provides a process for the production of 1,2-difluoroethene by catalytic cracking of 2-chloro-1,1-difluoroethane using the catalyst. The technical solution of the present application can greatly improve the conversion rate of HCFC-142, which is an industrial byproduct of no value, and obtain high-value target product 1,2-difluoroethene with high selectivity.

The invention discloses a method for rapidly and harmlessly treating ardealite, and particularly relates to the technical field of harmless treatment of industrial solid wastes. The method comprises the following steps: mixing raw materials with an alkaline neutralizer, a capturing agent and an activating agent, adding a phosphorus fixing agent and a fluorine fixing agent, mixing, carbonating and aging to obtain the harmless phosphogypsum. The alkaline neutralizer is adopted to quickly neutralize free acid, so that the pH value of the system is increased; the capturing agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form insoluble iron oxide gel or precipitate; the phosphorus fixing agent and the fluorine fixing agent are subjected to deep chemical precipitation, and a stable iron-calcium-phosphate / fluoride composite solidified body is formed. All the agents are clear in function and have a synergistic effect, the curing effect on high-water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simple compound agent system, and the leaching concentration can be reduced to be far lower than the national standard level.