30results about "Vanadium halides" patented technology

The invention relates to a preparation method of magnetic graphene, in particular to a chemical preparation method of magnetic graphene. The preparation method aims at solving the problems of the existing synthesis method that the reaction process is toxic and harmful to the environment, large-scale production cannot be realized, the morphology, size and magnetism of magnetic nanoparticles in the magnetic graphene are not controllable and the magnetic graphene cannot be dispersed in water. The chemical preparation method comprises the steps of: 1) preparing aminated Fe3O4 magnetic nanoparticles; 2) preparing graphene; and 3) preparing magnetic graphene through chemical reaction. The chemical preparation method of the magnetic graphene has the advantages that the high temperature and the high pressure are not required, the equipment is simple, the process cost is low, the environment is protected, no pollution is caused, the grain size of the synthesized magnetic nanoparticles is uniform, the controllable growth of the magnetic nanoparticles can be realized by changing reaction conditions, the solubility of the synthesized magnetic graphene is 0.8-1.2mg/ml, the magnetic graphene can be stably dispersed in water and sediment does not occur within 1-2 months. The graphene prepared by adopting the method can be used in biomedical, energy, electronic fields and the like.

The invention discloses a preparation method based on a solid-phase reaction for a capacitor electrode material. The preparation method comprises the following steps of: 1) adequately mixing and grinding cobalt acetate, oxalic acid and oxidized graphene to obtain an cobalt oxalate-oxidized graphene mixture; and 2) calcining the cobalt oxalate-oxidized graphene mixture aforementioned to obtain a cobaltosic oxide-graphene electrode material, wherein the dosage ratio by mole of cobalt acetate to oxalic acid is 1: 1, and the dosage of oxidized graphene is 5-30% of the mass of the finally obtained cobaltosic oxide; additionally, the selected ligand can also be citric acid and hexamethylenetetramine except oxalic acid; a solvent is not used in the solid-phase reaction of the preparation method disclosed by the invention, so that the side reactions generated in a water-phase reaction are avoided, the yield and the purity are increased, the reaction conditions are easy to control, and the operation is simple and practicable; and moreover, via the introduction of the graphene material, a novel way is provided for an oxide material with bad electrical conductivity, good energy storage property, and high theoretical specific capacitance in the field of capacitors, and the graphene material has important theoretical and practical application significance.

The present invention provides a system and method for purifying vanadium pentoxide. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to plasma oxidation, thereby obtaining a high-purity vanadium pentoxide product and chlorine gas. The chlorine gas is returned for low temperature chlorination. The system and method have advantages of favorable adaptability to raw material, no discharge of contaminated wastewater, low energy consumption and chlorine consumption in production, stable product quality, etc.

The present invention provides a system and method for purifying and preparing vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to fluidized gas phase ammonification, thereby obtaining ammonium metavanadate, and further obtaining a high-purity vanadium pentoxide powder product through fluidized calcination. The system and method have advantages of favorable adaptability to a raw material, no discharge of contaminated wastewater, low energy consumption and chlorine consumption in production, stable product quality and so on.

The invention discloses a method for preparing vanadic fluoride. The method comprises the following steps: (i) the pretreatment is performed to a reactor, vanadium is put in the reactor, and is preheated to 100 to 200 DEG C, and the reactor is evacuated to 0.1 below zero to 0.08 below zero MPa; (ii), the synthetic reaction is carried out, fluorine gas is fed into the reactor slowly, and fluorine gas and vanadium are in synthetic reaction in the reactor to generate vanadium tetrafluoride; (iii), the dismutation reaction is carried out, and vanadium tetrafluoride is in dismutation reaction in the reactor to obtain crude products of vanadic fluoride; (iv) impurities in the crude products of vanadic fluoride are removed; and (v) vanadic fluoride is purified. The invention has the advantages that equipment is simple, the operation is convenient, the content of impurities is low, the rate of conversion of intermediate by-products can be improved effectively, and the product purity can reach more than 95 percent.

The invention provides a production method and a production device of a metal halide. The production method of the metal halide comprises the following steps: 1, mixing a halogen source and a metal element source; 2, putting the mixture into a reactor, and introducing protective gas into the reactor for 1-5 hours; 3, under the protection of a protective atmosphere, heating the mixture to 100-400 DEG C, and carrying out heat preservation for 0.5-10 hours; and 4, under the protection of a protective atmosphere, continuously heating to 500-1000 DEG C, and carrying out heat preservation for 1-50 hours to obtain the metal element halide. The production method of the metal halide is simple in step and easy to implement, no toxic or harmful substances are generated, and harm of high-corrosivity and high-toxicity halogen to human beings and the environment is avoided or reduced.

The invention belongs to the field of purifying titanium tetrachloride with organic substances, and particularly relates to a compound organic substance for efficiently removing vanadium from crude titanium tetrachloride. The organic substance comprises: organic base oil, aromatic hydrocarbon oil, silicone oil, graphene and metal chloride, wherein the mass ratio of the components is (40-70):(2-10):(10-30):(5-10):(2-10), successively. The organic base oil is mixed white oil; the aromatic hydrocarbon oil is dimethylaniline; the silicone oil is dimethyl silicone oil; the graphene is copper-loadedgraphene oxide; the metal chloride is zinc chloride. The organic substance is easy to catalyze and crack, the vanadium removal efficiency is high, and the vanadium removal dosage is low.