8results about How to "Precise particle size control" patented technology

The present application belongs to the field of refractory material resource utilization, and particularly relates to a comprehensive treatment process for resource utilization of used refractory materials, which comprises: pretreatment, wherein the used refractory materials are sorted, surface cleaned and impurities removed to obtain raw materials for recycling; the raw materials are sequentially subjected to primary coarse crushing, secondary medium crushing, tertiary fine crushing and matched closed circuit screening to obtain crushed materials with target particle size; the qualified particle size materials are sent into a hydration and drying integrated equipment, and after hydration in a water vapor environment, vacuum drying is performed; the dried materials are sent into a wheel milling equipment through a quantitative feeder set, and selective crushing of pseudo-particles is performed under an applied pressure of 15-25 MPa, and finally, classification screening is performed to obtain regenerated materials with different particle size specifications. The process has the advantages that: the step-by-step accurate refinement from large waste materials to target particle size is realized, the particle size is accurately controlled, and the aggregate loss rate is effectively reduced. Compared with traditional single-stage or two-stage crushing, the over-crushing phenomenon is effectively controlled, and the aggregate recovery rate is improved.

The utility model is suitable for the technical field of ore grinding equipment, and provides a phosphate ore raw material grinding device which comprises an equipment body, the equipment body comprises a workbench, a material containing disc and a dustproof cover, and the dustproof cover is arranged on the upper end face of the material containing disc; the material containing disc is provided with a material containing cavity, a mounting cavity, a first discharging hole and a moving groove. The discharging structure comprises a rotating ring, a connecting plate, a worm and a worm gear, the rotating ring is provided with a connecting column, and the rotating ring is provided with a second discharging hole; according to the feeding device, a worker rotates the worm, the worm gear and the connecting plate rotate synchronously, and a gap is formed between the second discharging hole and the first discharging hole; the material containing disc rotates, and under the action of centrifugal force, the phosphate ore with the granularity meeting the gap size is thrown into the discharging cavity; and the steps are repeated until all the ground phosphate ores meeting the granularity are thrown into the discharging cavity through the gaps, so that the existence of a part of too large or too small particles is avoided, and stable and accurate granularity control is realized.

The application belongs to the technical field of catalyst material preparation, and provides a single-atom porous material catalyst, a preparation method thereof and application of the single-atom porous material catalyst in a methane aerobic conversion reaction. The application introduces reaction gas containing a gaseous metal precursor, a carbon source and a nitrogen source into a plasma reaction chamber, and uses plasma for chemical vapor deposition to obtain the single-atom porous material catalyst. The preparation method provided by the application can select gaseous, liquid or solid raw materials as a source of the gaseous metal precursor. The application can prepare various types of single-atom porous material catalysts, and enriches the application range of the single-atom porous material catalysts. The application realizes control of the particle size, morphology and distribution of the single-atom porous material catalyst by adjusting reaction parameters, and the prepared single-atom porous material catalyst can be used in the methane aerobic conversion reaction. Therefore, the preparation method provided by the application is simple in operation, strong in universality and has a good industrial application prospect.

The application provides a method for in-situ combustion synthesis of high-purity nanometer silicon carbide powder, and belongs to the technical field of inorganic nanometer material preparation, and comprises the following steps: placing water-soluble saccharide substances, gel monomers, water-soluble solutions of a crosslinking agent and an initiator into ion exchange columns respectively for filtration purification, then mixing the water-soluble saccharide substances, the gel material and high-purity silicon powder to form a sol, further carrying out in-situ gel solidification and pre-carbonization treatment to obtain a Si / C composite material block; carrying out combustion synthesis reaction on the obtained Si / C composite material, grinding the obtained block-shaped product to obtain the high-purity nanometer silicon carbide powder. The high-purity carbon source and the silicon source are fixed by the gel network, the silicon powder is uniformly embedded in the carbon skeleton, uniform dispersion and close combination of the two are realized, and the in-situ combustion synthesis reaction is efficiently promoted. The raw material cost in the application is low, the preparation process is simple, the environment is friendly, and the application is suitable for industrialized large-scale production of high-purity nanometer silicon carbide powder.

This invention discloses a method for producing high-quality nano-calcium carbonate from desulfurization ash, comprising the following steps: magnetic separation of the desulfurization ash; mixing the magnetically separated desulfurization ash with water to obtain a first desulfurization ash slurry; adding a mixed solution of sodium acetate and hydrochloric acid to the first desulfurization ash slurry, reacting to obtain a second desulfurization ash slurry with an acidic pH, and collecting the CO2 generated during the reaction; performing solid-liquid separation on the second desulfurization ash slurry to obtain the byproduct calcium sulfite and a mixed solution of calcium acetate and sodium chloride; adding sodium hydroxide to the mixed solution of calcium acetate and sodium chloride to adjust the pH to alkaline, and then performing solid-liquid separation to obtain metal hydroxide slag and a mixed solution of calcium acetate and sodium chloride; statically mixing the mixed solution of calcium acetate and sodium chloride with a sodium carbonate solution containing sodium tripolyphosphate using a peristaltic pump, and separating to obtain solid nano-calcium carbonate. This invention achieves the resource utilization of desulfurization ash and also prepares high-quality nano-calcium carbonate.

The utility model provides a kind of oil-in-water suspension preparation device, it is related to oil-in-water suspension preparation field, including stirrer body and stirring motor, the upper of stirrer body is equipped with syringe pump, the output end of syringe pump is movably connected with liquid injection pipe, the output end of stirrer body is equipped with transmission pipe by transmission pump, the output end of transmission pipe is connected with homogenizer, the utility model in liquid injection process, liquid level is detected in real time by liquid level sensor on liquid injection pipe, and electric push rod can correspondingly adjust the height of liquid injection pipe, and the controllable precision injection of cooperation syringe pump and pinhole syringe, so as to control oil phase dispersion rate, avoid agglomeration, keep stirring in the process of injection, oil phase is dispersed into micron level droplet by shear force, after transmission pump starts, emulsion preliminarily dispersed in stirrer body is transferred to homogenizer by transmission pipe, cooperates the synergistic effect of high pressure homogenization of homogenizer, realizes precision control to oil drop particle size, further improves stability.

This utility model discloses an ultrafine grinding disc suitable for high-fiber straw raw materials. The disc includes a disc rotor and a disc stator rotatably connected to the disc rotor. The disc rotor is circumferentially provided with multiple first and second gear teeth for grinding raw materials. At least two second gear teeth are located between two adjacent first gear teeth. The first gear teeth extend along the axial direction of the disc rotor and have guide portions. A grinding space is provided between the disc stator and the disc rotor. A discharge port for discharging the ground raw materials is provided on the outer side of the disc stator. The discharge port is connected to a grading mechanism for screening the particle size of the raw materials. This technical solution can achieve efficient grinding of high-fiber straw raw materials and maintain the uniformity of the raw material particle size.

The invention provides a preparation method and device of a high-dispersity metal nano material. The preparation method comprises the following steps: taking a metal material as an anode, and evaporating the metal anode through plasma working gas and arc discharge in a vacuum reaction chamber to form metal nano vapor; introducing quenching gas above the metal anode to form a quenching area, and quenching the metal nano steam to obtain initial metal nano particles; and introducing a form guide gas at a preset angle to form a guide gas flow, completing condensation, solidification and form determination of the initial metal nanoparticles in the moving guide gas flow, and introducing the initial metal nanoparticles into a collector communicated with the vacuum reaction chamber for deposition to obtain the high-dispersity metal nanomaterial. The device comprises a reaction chamber, a quenching gas pipe, a form guiding gas pipe, a collector, a metal anode and a cathode. The method and the device can be used for preparing the metal nano material with good dispersion and uniform particle size distribution.