36results about How to "Good crystal morphology" patented technology

The invention relates to a preparation method of polyhedral nano oxide for catalyzing. The preparation method comprises the following steps: preparing nano polyhedral copper oxide powder by a salt melting method taking a potassium source and a sodium source as melted salt; dissolving copper salt into water to prepare a solution; dropping an alkali source into the solution until the pH of the solution is 6-8; putting the solution into a constant-temperature magnetic stirrer to be stirred at constant temperature of 60 DEG C; filtering and washing for two to three times after sediment is generated and putting the product into a drying oven to be dried; putting a dried precursor, sodium salt and potassium salt into a ball milling tank to be milled; drying the milled mixed solution and transferring the solution into a crucible to be calcined; then cooling in the air to room temperature; and filtering, washing and drying to prepare the nano polyhedral copper oxide powder. The preparation method has the advantages of low synthesis temperature, simplicity in operation, uniform chemical components of the synthesized powder, good crystal appearance and the like; and a Rhodamine B degrading experiment shows that compared with commodity nano copper oxide, the catalyzing performance is greatly improved.

The invention relates to a process for recovering zinc from hot-dip coating zinc ash. The process comprises the following steps of: separating the hot-dip coating zinc ash after dry grinding and screening to obtain an oversize product and an undersize product; removing bound water and a small amount of zinc chloride from the oversize product under the condition that the temperature is between 400and 500 DEG C and the vacuum degree is 10 to 50 Pa; performing vacuum distillation on the oversize product under the condition that the temperature is between 650 and 800 DEG C and the vacuum degree is 10 to 30 Pa to obtain zinc; and performing alkali cleaning on the undersize product to remove chlorine, and then performing vacuum thermal reduction on the undersize product to obtain the zinc fromzinc oxide by using ferrosilicon as a reducing agent and calcium oxide as a slagging agent under the condition that the vacuum degree is 10 to 30 Pa and the temperature is between 1,050 and 1,200 DEGC. The process has a high recovery rate for recovering the zinc from the hot-dip coating zinc ash, and the obtained zinc has a good crystallized shape.

The invention provides a high-temperature-resistant and high-humidity-resistant fluoride red fluorescent powder and a preparation method thereof. The fluorescent powder has a general chemical formula of KmAnM1-xF6: xMn<4+>. In the general chemical formula, A is one or two selected from the group consisting of Cu, Ba and Zn; M is at least one selected from the group consisting of Ti, Si and Ge; m + 2n are equal to 2; n is no less than 0.05 and no more than 0.2; m is no less than 1.6 and no more than 1.9; x is more than 0 and less than 0.2; and the surface of the fluorescent powder is coated with a mixture of potassium silicate, carboxymethyl cellulose sodium and polyethylene glycol. The fluorescent powder provided by the invention can be effectively excited by light with the excitation wavelength being in a range of 300 to 500 nm, so red light with a peak wavelength of 610 to 650 nm and a half-peak breadth of only 2 to 9 nm is generated, and high color purity is obtained. The preparation method provided by the invention has simple flow, can prepare target products at low temperature and under normal pressure, and facilitates to large-scale industrial production; and a special coating technology is adopted in the invention, and a coating reagent is utilized to change the surface state of fluorescent powder particles, so the problem of agglomeration of solid particles can be effectively solved, and a fluorescent powder product with good dispersion properties and high-temperature-resistant and high-humidity-resistant performances can be obtained.

The invention discloses a preparation method and application of cubic molybdenum nitride, belonging to the field of lithium-ion battery electrode materials. The preparation method is as follows: S1, the ethanol solution of urea, the ethanol solution of melamine and ammonium molybdate tetrahydrate The ethanol solution is mixed, stirred to obtain a mixed solution; the mass ratio of ammonium molybdate tetrahydrate, urea, and melamine in the mixed solution is 5-11:100:3-6; S2, aging the mixed solution at room temperature, Forming a sol / gel, then freeze-drying to form a solid; S3, pre-calcining the obtained solid, and then performing heat treatment to obtain a precursor powder; S4, roasting the obtained precursor powder under a nitrogen atmosphere, After cooling to room temperature, the molybdenum nitride electrode material is obtained; the present invention obtains nano-scale molybdenum nitride powder products through a simple process. Excellent cycle performance and high specific capacity.

The invention discloses a preparation method of M-position doped vanadium-based MXene. Metal powder, aluminum powder, carbon powder and molten salt are mixed in a certain proportion to prepare powder; then the powder is placed in a mortar and a grinding liquid is added. After grinding under air conditions for 3-8min to make preliminary mixing, then transfer to a ball milling tank for ball milling for 3-6h to obtain powder, and then place the powder in a magnetic boat for high-temperature atmosphere sintering to obtain M-position doped MAX phase powder body, mix it with the etchant according to a certain proportion, and then magnetically stir it at 20-35 ℃ for 12-36 h, after cleaning, centrifugation and drying to obtain M-position doped V 2 CT x MXenes. The MXene powder material prepared by the invention has the characteristics of high purity, many hybridization sites, etc., the structure can be fine-tuned according to the requirements of working conditions, and has wide application prospects in the field of isoelectrochemistry.