10 results about "Titanium hydroxide" patented technology

This invention provides a manufacturing method that allows for the production of a single phase of rutile-type titanium dioxide even under manufacturing conditions where the molar ratio of Ti to Sn (Ti / Sn) is high (i.e., the Sn content is low). [Solution] A method for producing rutile-type titanium dioxide comprising the following steps. (1) A gelatinization step in which hydrogen peroxide is added to an aqueous dispersion of titanium hydroxide gel, and the molar ratio of Ti to hydrogen peroxide (H2O2 / Ti) is adjusted to 15 or more to obtain a gelatinization solution. (2) A tin addition step in which a tin source is added to the gelatinizing solution and the molar ratio of Ti to Sn (Ti / Sn) is adjusted to 16 to 80 in order to obtain a hydrothermal treatment precursor. (3) Crystallization step of hydrothermally treating the hydrothermal treatment precursor to obtain rutile-type titanium oxide

The present application relates to the technical field of dielectric ceramic powder preparation, and particularly relates to a multilayer ceramic capacitor and a method for preparing high-performance nano-barium titanate powder used for the multilayer ceramic capacitor, the method comprising the following steps: high-purity titanium hydroxide precursor and solid-state barium source are mixed under the condition of deep cold medium at low temperature, so as to form an amorphous composite precursor with high reactivity, and finally, the nano-barium titanate powder is generated through a hydrothermal synthesis reaction. The present application realizes the forced mixing of the titanium hydroxide precursor and the solid-state barium source at the solid state through the low-temperature cryogenic grinding, so as to physically ensure that the Ba / Ti ratio is highly consistent in each micro area, and the problem of the out-of-control stoichiometric ratio is solved from the source. Meanwhile, the high activation of the precursor shortens the hydrothermal reaction time, greatly reduces the calcination temperature, effectively inhibits the abnormal growth of the crystal grains, and makes the product particle size distribution narrower and the performance better.

The disclosed method for manufacturing barium titanate particles comprises: a process (i) for preparing titanium hydroxide by simultaneously neutralizing an aqueous titanium halide solution and an alkaline substance under predetermined conditions; a process (ii) for preparing a slurry of the titanium hydroxide; a process (iii) for preparing a titanium compound by adding a predetermined amount of inorganic acid and an organic acid to the slurry and then maintaining the slurry at a temperature in the range of 40 to 90°C; and a process (iv) for synthesizing barium titanate particles by hydrothermal synthesis using a raw material containing the titanium compound. The titanium compound contains amorphous titanium hydroxide and anatase-type titanium dioxide. The specific surface area of ​​the titanium compound is 250 m² / g or more.

A preparation method of a digestion solution for corrosion of tantalum-niobium-containing alloy waste comprises the following synthesis steps: taking a certain amount of halogenated iron salt, adding the halogenated iron salt into dilute halogen acid under high-speed stirring until the halogenated iron salt is completely dissolved, then adding hexafluorotitanic acid and titanyl sulfate solids according to a certain proportion to be completely dissolved, then adding excessive newly-prepared titanium hydroxide to react for a period of time, and finally adding a catalyst to react for a period of time; and filtering and adding graphite powder for later use. The decomposition method comprises the following steps: shearing and crushing the tantalum-niobium alloy-containing waste material to obtain the result; and adding the digestion solution into a small section with the diameter of 50 mm, heating to 40-70 DEG C, dropwise adding hydrogen peroxide, cooling the discharged gas, and enabling the condensed water to flow back to the system. Filtering after sampling and detecting that no metal exists, adjusting the filtrate to an initial state after analyzing components, adding a proper amount of sulfuric acid and hydrofluoric acid into a filter cake to adjust and dissolve until the filter cake meets the extraction requirement, and entering an extraction process line.

The invention relates to substituted Ti and N co-doped manganese dioxide prepared based on a solid phase method and application thereof, and the preparation method comprises the following steps: (1) dissolving a soluble titanium salt in an aqueous solution containing a divalent manganese salt, and adding a sodium carbonate solution into the solution while stirring until a mixed precipitate (Ti (HO) 4 / MnCO3) of titanium hydroxide and manganese carbonate is generated; (2) adding KMnO4 powder into the prepared Ti (HO) 4 / MnCO3 precipitate, fully grinding, putting the ground mixture into a muffle furnace, and carrying out heat treatment; (3) collecting the powder in the step (2), cleaning the powder with deionized water, placing the powder in a KOH solution for ultrasonic treatment, and washing and drying the treated powder to obtain Ti-doped manganese dioxide (Ti-MnO2); (4) adding NH2Na powder into the Ti-MnO2 powder, fully grinding, putting the ground mixture into a muffle furnace, and carrying out heat treatment; and (5) collecting the powder subjected to heat treatment in the step (4), and washing and drying to obtain the alternative Ti and N co-doped manganese dioxide (Ti / N-MnO2).

The disclosed method for manufacturing barium titanate particles includes: step (i), preparing titanium hydroxide by simultaneously neutralizing an aqueous solution of titanium halide and an alkaline substance under specified conditions; step (ii), preparing a slurry of the aforementioned titanium hydroxide; step (iii), preparing a titanium compound by adding specified amounts of inorganic acid and organic acid to the aforementioned slurry and maintaining the slurry at a temperature in the range of 40–90°C; and step (iv), synthesizing barium titanate particles by hydrothermal synthesis using raw materials containing the aforementioned titanium compound. The titanium compound contains amorphous titanium hydroxide and anatase titanium dioxide. The specific surface area of ​​the titanium compound is 250 m² / s. 2 / g or more.

The present application relates to the technical field of surface treatment, in particular to a preparation method of titanium oxychloride solution for cadmium-titanium plating test. In order to solve the technical problem that it is difficult to effectively prepare cadmium-titanium plating bath liquid meeting the requirements of navigation marks in the research and development stage, the present application uses industrial-grade titanium oxysulfate as raw material, adopts semi-quantitative analysis, and conveniently and effectively prepares the titanium oxychloride solution required in the research stage without complicated calibration process. By adjusting the addition amount of hydrochloric acid and the dissolution time of titanium hydroxide precipitation, the problem of easy turbidity of the plating bath liquid after adding the titanium oxychloride solution into the cadmium-titanium plating bath liquid is solved, thereby improving the stability of the cadmium-titanium plating bath liquid. Based on the preparation method, the difficulty of researchers in the development stage of cadmium-titanium plating technology is reduced, and the foundation for the effective development of subsequent electroplating process and electroplating parameter research is laid.

The invention discloses a porous composite photocatalytic material and a preparation method thereof, and belongs to the technical field of photocatalytic materials.The preparation method comprises the steps that a titanium source is added into water to obtain a titanium-containing aqueous solution, and an alkaline solution is added for a reaction to obtain a titanium hydroxide colloidal solution; adding an organic acid stabilizer into the titanium hydroxide colloidal solution for reaction to prepare a titanium hydroxide solid, repeatedly washing with deionized water, dispersing the titanium hydroxide solid into the deionized water and fully stirring, adding microfibers with a three-dimensional network structure and a hydrogen peroxide solution, heating for reaction, and then cooling to 4-6 DEG C through heat exchange to obtain the titanium hydroxide / microfiber composite material. And drying in vacuum, and calcining to obtain the titanium dioxide-loaded photocatalytic material. According to the preparation method disclosed by the invention, loading can be realized while titanium dioxide is generated, the adhesive force of titanium dioxide is greatly enhanced, the distribution uniformity of titanium dioxide is good, and the catalytic performance is effectively improved while raw materials are saved.

This method for producing a positive electrode active material for secondary batteries is characterized by including: an oxidation step of adding at least one hydroxide selected from the group consisting of aluminum hydroxide, strontium hydroxide, titanium hydroxide, bismuth hydroxide, zirconium hydroxide, and barium hydroxide to an Ni-containing compound, and performing oxidation treatment by heating the mixture; a firing step of mixing an oxide obtained in the oxidation step with an Li-containing compound, and firing the mixture; a water-washing step of mixing a fired product obtained in the firing step with water or an aqueous solution, and washing the mixture with water; and a drying step of drying the wet powder obtained in the water-washing step to obtain a lithium transition metal composite oxide, wherein the heating temperature in the oxidation step is 250°C-650°C inclusive.

The present invention provides a titanium dioxide dispersion, a method for producing the same, a titanium dioxide film, and a titanium dioxide electron transport layer, all of which have a low environmental impact and can reduce manufacturing costs. [Solution] The present invention provides a method for producing a titanium dioxide dispersion, comprising: a first step of obtaining titanium hydroxide by hydrolysis of a titanium compound; a second step of preparing a peroxotitanic acid complex solution with the titanium hydroxide using hydrogen peroxide and ammonia; a third step of adding a primary hydroxycarboxylic acid to the peroxotitanic acid complex solution to obtain a water-soluble titanium complex solution; and a fourth step of hydrothermally treating the water-soluble titanium complex solution to obtain a primary titanium dioxide dispersion.