3245results about How to "Small particles" patented technology

The invention provides a method and equipment using organic adhesive mixed solvent and powder to manufacture three-dimensional workpieces. The work principle is as follows: the raw materials are stirred into slurry, which is laid as a green compact thin layer that can disintegrate in disintegrant; the green compact thin layer can form a workpiece thin layer that does not disintegrate in the disintegrant after scanned by an energy beam; in such a cycle, the steps of laying the thin layer and energy beam scanning are repeated, and then the three-dimensional workpiece can be formed; and the disintegant is used for separating the green compact not scanned by the energy beam from the workpiece, thus remaining the needed three-dimensional workpiece. The invention is widely applicable to manufacturing plastic, metallic, ceramic and compound workpieces, can avoid the defects of a selective laser sintering method, can use fine and very thin powder and therefore, can manufacture a finished product which is better than that made in the traditional selective laser sintering method in surface roughness and texture fineness, in addition, through subsequent densified sintering, the metallic and ceramic workpieces can have the strength superior to that in the traditional selective laser sintering method.

The invention provides a preparation method of a metal monatomic site catalyst. According to the synthetic strategy, a porous complex composite material coated with an acetylacetone metal salt is formed from a zinc compound and an imidazole organic ligand through coordination in a methanol solution of the acetylacetone metal salt, and then a porous carbon support doped with nonmetal heteroatomic nitrogen is formed from the imidazole organic ligand through a high-temperature pyrolytic reaction in an inert gas atmosphere, wherein metal atoms interact with surrounding nonmetal heteroatomic nitrogen and exist in the form of single atoms. The method is simple, safe, low in cost and applicable to synthesis of various noble metal and non-noble metal monatomic site catalysts, and the obtained metal monatomic site catalyst is high in metal concentration and good in heat stability, can be applied to the fields of energy, catalysis, medicine, biology and the like and has quite broad market prospect.

A polycrystalline LiFePO4 powder with olivine structure is prepared from Fe(Ac)2, FeSO4.7H2O, Ba(Ac)2 and organic acid by the sol-gel method. Its advantages are short period, low burning temp., low energy consumption, high purity and electric conductivity, and high granularity uniformity. It is suitable for making Li-ion battery.

A water-base and elastic heat insulation coating and the preparation method are provided. The invention adopts the elastic pure emulsion and the silicone-acrylate emulsion as the film former and also adopts the materials such as insulating materials and rutile type titanium pigment talc. The preparation process is that water is added with a dispersant, an antifoamer A, a pH regulator with right amount, propylene glycol and titanium pigment in turns under the stirring speed of 500r / min; the rotary speed is adjusted to 1500r / min and the dispersive degree below 25Mum; then an antifoulant, a mildewproof agent, an antifoamer B, silicone-acrylate emulsion, elastic emulsion and a film forming additive are added to stirred for 10min under the rotary speed of 500r / min and then the rotary speed is adjusted to 300r / min, and two third of the insulating materials are added to stir for 20min; at last, the remaining insulating materials are added to stir for 20min under the rotary speed of 300r / min, and the thickeners A, B are added to stir for 15min; the pH value is adjusted to 7.5 to 9 and a preservative is added to stir for 10min to produce the coating of the invention.

A composite proppant having a proppant substrate such as a porous ceramic or silica sand coated with magnetic particles and a method of propping a subterranean formation using a composition consisting essentially of the composite proppant.

A composition for a plug for wellbores undergoing plugging and abandonment operations is described. Methods of setting the plug are also described.

The invention relates to a nano lithium iron phosphate material and a preparation method thereof. A lithium source, an iron source, a phosphate radical source and a doped element compound are dissolved in water solution containing a complexing agent according to a stoichimetric proportion and added with high-conductive carbon nano tubes scattered by assistant to form a cladding material, the obtained solution is sintered in an inert atmosphere furnace, the reaction temperature is between 500 and 900 DEG C, and the reaction time is 3 to 16 hours. The method effectively controls the chemical components, phase components and grain diameters of LiFePO4; and the obtained lithium iron phosphate is the nano lithium iron phosphate clad by the carbon nano tubes, has fine and even grains with high purity, high charge / discharge capacity, good multiplying power performance and good cycle performance, and is an ideal material for manufacturing lithium ion batteries.

The invention relates to a hydrothermal synthesis method for lithium ferromanganese phosphate anode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. The method has the following processing steps of: step 1, preparing LiMnxFe1-xPO4 through a hydrothermal synthesis reaction: mixing an aqueous lithium hydroxide solution, an aqueous ferrous sulfate solution and phosphoric acid under a stirring condition, after sealing, heating to 150 DEG C to 180 DEG C within 0.5 to 2 h, reacting for 0.5-4 h under the pressure of 0.48-1.0 Mpa, cooling to less than 80 DEG C, and filtering; step 2, mixing with organic matters and drying: mixing a wet filter cake with a soluble carbon source organic matter, and carrying out spray drying or expansion drying; and step 3, carrying out carbon-coated processing: roasting LiMnxFe1-xPO4 carbon source compound powder at a temperature between 600 DEG C and 750 DEG C for 4-6 h under an insert gas condition, and cooling to less than 150 DEG C to obtain a carbon-coated lithium ferromanganese phosphate anode material of the lithium ion battery. The hydrothermal synthesis method disclosed by the invention has the advantages of simple and controllable technology, convenience for operation, low cost, high crystallization degree of products, uniform dispersion, high specific capacity, high conservation rate of the cycling capacity, and the like.

The invention discloses a kind of preparation method of silica sol of high activity. For this kind of silica sol, the particle is tiny and grain size of it is distributed narrowly. It is characterized in that it takes sodium silicate as raw material, natrium ion is took out using method of exchanging ion and then get active silicic acid solution, prepare silica sol of high activity whose grain size is 6-12 nm, content of silicon dioxide is accounting for 10-30%,content of sodium monoxide is accounting for 0.2-0.3%, and PH value is between 8.5 and 10.5,through controlling proportion, pH value of reaction and heating temperature of active silicic acid solution. Silica sol prepared using this method can satisfy needs of spinning sizing, organic polymerization catalysis and modifying technology. Compared to common ion-exchanging method, preparation method of the invention has advantages of tiny particle, equal granularity, synchronizing dehydration and purification and low energy wasting, and it can control size of particle according to needs of actual utilization.

The invention discloses smoke processing technology, which belongs to the technical filed of environment protection. The smoke processing technology at least comprises the following steps: a. smoke cooling: introducing smoke into a quench tower to be cooled; b. half-dry deacidification: introducing cooled smoke into an absorber provided with an alkaline material injection device; c. dust removal: introducing the smoke processed by the second step into a bag type dust remover; d. denitration: introducing the smoke processed by the third step into a denitration device provided with an ammonia spraying device; e. wet type deacidification: introducing the smoke processed by the fourth step into a wet type absorption tower provided with an alkaline liquid spraying device, wherein the alkaline material in the second step is a mixture of active slaked lime and active carbon. The invention has high purification efficiency on acid gas, saves the technical area, and saves the cost. Proper adjustment can also be carried out according to the actual smoke ingredients and the technical requirements, the flexibility is high, and the applicable range is wide.

The invention relates to preparation and application of a BiOBr / BiOCl compound photocatalyst, belonging to the technical field of photocatalysis water treatment in environmental chemical engineering. In the invention, the preparation method comprises the following steps: hydrolyzing BiCl3 and BiBr3 which are used as raw materials, precipitating, carrying out solid-liquid separation, drying and the like to obtain the BiOBr / BiOCl compound photocatalyst. The BiOBr / BiOCl compound photocatalyst can be used for degrading organic substances in water, and especially for treating trace amounts of toxic and harmful nondegradable organic substances in water. The BiOBr / BiOCl compound photocatalyst prepared by the invention has the advantages of simple technique, low cost, high photocatalysis activityand the like, is safe to operate, and has wide industrial application prospects.

The invention relates to a wafer edge protection ring and a method for reducing particles at a wafer edge. The protection ring is located in a reaction cavity of a plasma processing device, the protection ring can cover the wafer edge in the process that a wafer is processed so that processing byproducts including polymers can be borne, and the protection ring can move in the process that the wafer is released and take the collected polymers off the wafer. The wafer edge protection ring is simple in structure, convenient to control and capable of effectively reducing the particles at the wafer edge and guarantees quality of a chip on the wafer edge.

The invention provides a method for in-situ growth of CoP nanoparticles on a g-C3N4 surface and application. The method is mainly characterized in that in-situ growth of Co(OH)2 on carbon nitride is performed according to an in-situ loading method, and then sodium hypophosphite is decomposed under the protection of an inert atmosphere to release PH3 gas to generate CoP. By adoption of the method, the CoP nanoparticles can be uniformly loaded on carbon nitride, and a composite CoP / g-C3N4 photocatalyst is obtained finally. Easiness in raw material acquisition and simplicity in operation are realized, and the composite photocatalyst is innovatively applied to photocatalysis production of hydrogen peroxide; as an auxiliary catalyst, CoP is capable of enhancing visible light absorbability, and owing to the metalloid property of CoP, quick separation of electrons and holes can be realized, and absorbed light can be used more efficiently, and finally catalysis activity of carbon nitride being a main catalyst in photocatalysis production of hydrogen peroxide is effectively improved.