31results about How to "Control sedimentation rate" patented technology

The invention discloses a method for producing a grinding electroplated diamond wheel. The method comprises the steps of: 1, preparing an electroplating bath; 2, pre-treating before plating; 3, pre-plating, wherein the current density is 1.2-1.8A/dm<2>, and the thickness of a pre-plating layer is 7-10micrometers; 4, magnetically sand feeding, namely applying magnetic induction intensity of 400-1000mT on a plating surface of a grinding wheel base body so as to absorb a diamond abrasive through the plating surface of the grinding wheel base body, and depositing an electroplating layer through electrifying, wherein the sand feeding current density is 0.5-0.8A/dm<2>, and the thickness of the plating layer is 15% of the average particle size of the diamond abrasive; 5, thickening, wherein the current density is 1.6-2.0A/dm<2>, and the thickness of the thickened plating layer is 65% of the average particle size of the diamond abrasive; and 6, treating after the plating so as to obtain the grinding electroplated diamond wheel. By utilizing the method for producing the grinding electroplated diamond wheel, the abrasive with fine granularity can be uniformly solidified on the plating surface, and the produced grinding wheel has good shape retention performance and satisfies grinding requirements on high precision and high efficiency.

The invention discloses an aluminum-doped spinel manganese-based material and a preparation method thereof. The method comprises the steps of respectively putting configured manganese source compound solution, or a nickel source compound, aluminum salt compound solution and a precipitator solution into a reactor according to the flow rate being 0.5-2L/h, stirring to control the pH value of a system to be 7-8.5 and the heating temperature of the system to be 30 DEG C-60 DEG C, heating and then curing for 10h-20h to obtain a spherical precipitate precursor, washing and drying the spherical precipitate precursor; forging the dried precipitate for 5-20h under the temperature being 600-900 DEG C; and sufficiently mixing oxidizing materials and a lithium source compound according to a proportion that the stoichiometric ratio exceeds the lithium source compound by 1-10%, and forging for 5-20h under the temperature being 600-900 DEG C to obtain the modified spinel manganese-based material. According to the method disclosed by the invention, the feature of the precursor and the distribution uniformity of an Al element can be improved effectively; due to the reasonable high forging temperature and doping proportion, the structure stability of the aluminum-doped spinel manganese-based material can be improved greatly, and the circulation performance and high-temperature and low-temperature performances of the material can be improved; and the process is simple, and the repeatability is good.

The invention belongs to the technical field of catalytic material, and discloses a core-shell structure nanometer copper cerium composite oxide catalyst, and a preparation method and applications thereof. The core-shell structure nanometer copper cerium composite oxide catalyst can be used for ammonia selective catalytic oxidation reaction. Catalyst synthetic conditions are adjusted, so that control on copper oxide particle surface local hydrolysis reaction is realized, regulation and control on cerium oxide outer wall generation and copper oxide particle etching degree are realized, and at last, the CuO@CeO2 core-shell structure composite material taking mesoporous structure CeO2 as the shell is obtained. The catalyst possesses excellent ammoxidation activity and N2 selectivity, and highreaction stability; the preparation method is simple, reliable, and high in efficiency; the raw materials are easily available; and the preparation method is convenient for large scale preparation.

The invention belongs to the technical field of quartz sand processing, and specifically discloses a method for sorting quartz sand. The method comprises the following steps that clear water is continuously fed into a sorting box, and clear water flows upwards; quartz sand particles and clear water are mixed into a sand-water mixture, and the sand-water mixture is introduced into the sorting box from the side wall of the sorting box at a flow rate of 100 M<3>/H to 300 M<3>/H; ultrasonic force is applied to the quartz sand particles in the sorting box through an ultrasonic generator, and the frequency of the ultrasonic generator is 28 KHz to 42 KHz; and the quartz sand particles in the sorting box are discharged and collected after sorting is completed. By adopting the process, the quartz sand can be cleaned while being sorted, and the production process of quartz sand is shortened.

The invention discloses a method for preparing a finishing liquid for improving the anti-electrostatic property of a fabric and relates to the field of fabric finishing. The method specifically comprises the following steps: firstly, dissolving manganese nitrate and zirconium acetate into ethanol, adding sodium chloride and citric acid, precipitating with an alkali liquid, and mixing with porous silica gel and carbon nanotubes so as to obtain mixed powder; dispersing the mixed powder into deionized water so as to obtain a dispersion liquid, further putting into a sticky liquid prepared after sodium alginate is dissolved into an alkali liquid, finally reacting with butyl acrylate and potassium peroxodisulfate, further adding a thickening agent, a defoaming agent and a leveling agent, and uniformly stirring and mixing, thereby obtaining the finishing liquid. The finishing liquid prepared by using the method is high in stability, high in wettability with a fabric, and capable of effectively improving the anti-electrostatic property and the weather resistance of the fabric.

The invention belongs to the technical field of catalysts, and provides a preparation method of nano hydrated iron oxide. According to the preparation method, the mixed solution containing the water-soluble ferric salt and the precipitant is firstly prepared, then the mixed solution containing the precipitant is dropwise added into the mixed solution containing the water-soluble ferric salt for the hydrothermal precipitation reaction, nanoscale ferric oxide hydrate FeOOH is obtained, the particle size uniformity and catalytic activity of the catalyst are guaranteed, the preparation process is simple, and the cost is low; citric acid and ethanol are respectively added as dispersing agents in the process of preparing two mixed solutions and are used for dispersing particles in the hydrothermal reaction process, so that the precipitation speed is controlled, rapid growth of the particles is avoided, and the nano-catalyst with smaller particles is obtained. The result of the embodiment shows that the particle size of the hydrated iron oxide prepared by the preparation method provided by the invention is 15-25nm; when the catalyst is used for catalytic conversion of ortho-parahydrogen, the concentration of parahydrogen is 49.7%, and the conversion rate is 99.3%.

The invention discloses a preparation method of a high-capacity secondary alkaline zinc-nickel battery. The method comprises the following steps that firstly, a Ni3(BTC)2 DMF precursor is prepared with nickel salt and BTC as raw materials; secondly, the precursor is subjected to pre-carbonization to obtain a pre-carbonized Ni3(BTC)2 DMF precursor; thirdly, pre-carbonized powder and sulfur powder are mixed and sulfurized to prepare a Ni3S2/C composite material; a positive plate is prepared; fourthly, zinc oxide is prepared through a co-precipitation method; fifthly, zinc oxide, zinc powder andsodium phytate are mixed and ground and then mixed with polytetrafluoroethylene emulsion to prepare negative slurry, then the surface of a collector material is coated with the negative electrode slurry, drying and rolling are conducted, and a negative plate is prepared; the positive plate, a diaphragm and the negative plate are laminated together and wound into a core to be placed into a batteryshell, then an electrolyte is injected, tabs are subjected to spot welding, sealing and formation are conducted, and the secondary alkaline zinc-nickel battery is prepared. The battery prepared through the method is good in cycling stability and large in capacity.

The invention discloses a method for reducing secondary osmium absorption liquid, which comprises the following steps: adjusting the pH value of the secondary osmium absorption liquid to 5-7, and controlling the concentration of the secondary osmium absorption liquid to be 25-30g/L; and heating the secondary osmium absorption liquid to 55-65 DEG C, adding an ethanol solution, reacting for 1-2 hours at the constant temperature of 55-65 DEG C, filtering and washing to obtain the metal osmium. The ethanol solution is used for replacing hydrazine hydrate reduction osmium secondary absorption liquid, so that the cost is reduced. According to the method, the pH of the osmium secondary absorption liquid is adjusted before the ethanol solution is added, so that the osmium precipitation rate of the osmium absorption liquid can be effectively controlled; hydrazine hydrate is replaced with an ethanol solution, and due to the fact that hydrazine hydrate is a strong reducing agent and has certain dangerousness, the safety risk is reduced; according to the method, the osmium absorption liquid is heated to 55-65 DEG C before the ethanol solution is added for reduction, the reduction efficiency is effectively improved, the osmium reduction rate is larger than or equal to 99%, and the content of osmium in the liquid after reaction is smaller than or equal to 0.01 g/L.

The invention discloses a simple preparation method for nano-grade tungsten-copper precursor powder. The method comprises the steps that a corresponding solution is prepared by taking tungstic acid sodium salt dihydrate and copper nitrate hydrate as raw materials, then a sodium tungstate solution is dropped into a copper nitrate solution containing copper complexing ions with the speed of 1-10 drops per second, then the pH value of the mixed solution is adjusted by using ammonia water or nitric acid, and then the mixed solution is directly put into a vacuum drying oven to generate thermochemical reaction, so that the nano-grade tungsten-copper precursor powder is prepared. By utilizing the method, the tungsten-copper precursor powder which is uniform in mixing, fine in particle and high inpurity can be prepared, and compared with a hydrothermal method, the method has the significant characteristics that the production period is short, a reaction kettle is not needed, and the preparation cost is reduced.

The invention relates to the field of multifunctional glass preparation, and provides abrasion-resistance glass based on a micro-nano array structure coating. A plasma spraying technology is adopted for preparing a silicon nitride coating with the thickness of 100-200 nm on the surface of the abrasion-resistance glass; a zinc fluoride micro-nano array layer with the thickness of 80-150 nm grows onthe surface of the silicon nitride coating, and zinc fluoride is hollowed and grows perpendicularly on the surface of the silicon nitride coating; polymer macromolecular chains are grafted on the surface of the zinc fluoride micro-nano array and are carboxymethyl chitosan. The invention further discloses a preparation method of the abrasion-resistant glass. According to the prepared abrasion-resistance glass, a membrane layer and a glass substrate are good in bonding performance, the abrasion resistance of the glass can be improved effectively, and mechanical properties are excellent.