30results about "Vanadium halides" patented technology

The present invention provides a system and method for producing high-purity 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 hydrolyzation and fluidized calcination, thereby producing a high-purity vanadium pentoxide product and a by-product of hydrochloric acid solution. The system and method have advantages of favorable adaptability to raw material, no discharge of contaminated wastewater, low energy consumption in production, low operation cost, stable product quality, etc.

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.

In a non-aqueous electrolyte secondary battery, in order to adjust a cathode active material in which guest cation such as Na and Li is included, alkaline metal fluoride which is expressed by a general formula AF and transition metal fluoride which is expressed by a formula M′ F2 are subjected to a mechanical milling process to produce metal fluoride compound AM′ F3. The mechanical milling process desirably uses a planetary ball mill.

The invention provides a method and a system for recycling vanadium-containing mud generated in a vanadium removal process of crude titanium tetrachloride. The vanadium-containing mud contains titanium tetrachloride liquid and VOCl2 solid. The method comprises the steps of adding the vanadium-containing mud into a molten salt furnace, evaporating, and collecting titanium tetrachloride in the vanadium-containing mud; introducing chlorine into the vanadium-containing mud to ensure that chlorine is reacted with VOCl2 in the vanadium-containing mud, and obtaining mixed gas containing VOCl3 gas and chlorine; condensing the mixed gas to obtain VOCl3 liquid and chlorine, wherein molten salt is filled in the molten salt furnace, and the temperature of the molten salt furnace is kept at 600-750 DEG C. The recycling system is used for implementing the method, and comprises the molten salt furnace, an air supply pipe, a TiCl4 gas collecting unit and a condenser. The recycling method and recycling system, provided by the invention, are used for realizing one-time recovery of valuable elements namely titanium and vanadium in the vanadium-containing mud, and are high in yield of vanadium and titanium, and high in purity of obtained products.