34results about How to "Large particle size range" patented technology

The invention discloses a median type tailing damming method utilizing mold bags. The median type tailing damming method has the advantages that the grouted mold bags 7 are piled up to build a downstream dam body 2, the downstream dam body 2 is kept clean and smooth by the sand consolidation effect of the mold bags 7, and the environmental problems such as dust flying, gullying and coarse sand loss are solved well; tailing pulp with the content of tailing particles, smaller than 0.05mm in size, not larger than 40% (by weight) is taken as mold bag filling pulp for the mold bags 7, so that the particle size range of tailing sand available for damming is widened, sand quantity available for the median type tailing damming method is increased, water drainage of the mold bags 7 can be accelerated, solidification can be speeded up, and grouting efficiency of the mold bags 7 is improved; in addition, the action of gravity is fully utilized for grouting, and the mold bags 7 can be grouted by multiple branch ore drawing pipes 92 at the same time, so that cost and energy consumption are reduced, and damming efficiency is improved.

A preparation method of ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid belongs to the technical field of ultraviolet cured aqueous paint. The preparation method of the invention comprises: mainly using diisocyanate compounds, polyether polyol, polyhydroxycarboxylic acid and hydroxyl acrylate monomer as main raw materials to prepare a urethane acrylate prepolymer through an acetone process; adding amine compounds and water for salt formation and emulsification, introducing aqueous silicon dioxide sol in the emulsification process to obtain the ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid. The invention introduces the aqueous nanometer-sized silicon dioxide in situ in the synthesis of the aqueous urethane acrylate dispersoid to obtain the silica sol modified aqueous urethane acrylate dispersoid. The introduction of the inorganic nanometer-sized silicon dioxide obviously improves the mechanical property of a light-cured coating. The dispersoid can be widely applied to the surface coating field of woodware, metal and plastic rubber and the like with high scratch resistance and wearing resistance.

The invention discloses a synthesis method of hydroxylated polyvinyl chloride copolymer resin. The synthesis method comprises the following steps of: adding hydroxyethyl methacrylate (HEMA) and an initiator II in a mixture of a composite emulsifying agent, an initiator I, water, a pH regulation agent, seed emulsion and a vinyl chloride monomer in a fluid mode, conducting polymerization reaction, and conducting spray drying on prepared emulsion to obtain the hydroxylated polyvinyl chloride copolymer resin, wherein the composite emulsifying agent is composed of an emulsifying agent I and an emulsifying agent II; the emulsifying agent I is sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium lauryl sulfate, nonyl aryl polyether alcohol, ammonium laurate, polyoxyethylene nonyl phenyl ether or polyoxyethylene octylphenol ether; and the emulsifying agent II is tetradecyl alcohol, setanol, stearyl alcohol, dodecanoic acid, tetradecanoic acid, tetradecanoic acid, octadecanoic acid, hexadecane or octodecane. The synthesis method is simple in equipment, solves the problems of low reaction conversion rate, large HEMA homopolymerization rate, low HEMA content in polymer and the like, and is low in cost, saving in energy consumption and less in pollution discharge.

The invention provides a method for preparing a mesoporous theta-aluminum oxide spherical carrier. The method is characterized by comprising the following steps: adding a template agent and a molding agent into aluminum sol, and generating a great number of mesoporous structures from alumina spheres in the sol-gel molding and aging process of the aluminum soil in the presence of the template agent. The specific surface area of the mesoporous spherical aluminum oxide is 50-200m<2> / g, the granular diameter of the mesoporous spherical aluminum oxide is 0.4-5mm, the pore volume of the mesoporous spherical aluminum oxide is 0.3-1.6cm<3> / g, the aperture of the mesoporous spherical aluminum oxide is 10-35nm, and the crushing strength of the mesoporous spherical aluminum oxide is 25-200N / granule. The spherical aluminum oxide prepared by using the method has the advantages of high pore volume, large aperture, high strength and the like.

The invention discloses a concentration measuring device and method for dust in large diameter range. Aiming at the shortcoming that scattering integration method in the prior art is not applicable when the particle size is smaller than 10 microns, the measuring device uses a multistep neutral density filter to attenuate transmission light and scattered light to a same light intensity level, realizes simultaneous shooting of transmission light and scattered light in a measurement system of a single digital area-array camera, and has the advantages of high sensitivity, fast response and simple and compact optical system. According to the obtained information of scattered light and transmission light, the distribution of particle size can be acquired; with the known particle size distribution, a method combined scattered light with scattering integration can be used to measure dust concentration of micron level, and a method combined transmission light with light extinction can be used to realize the measurement of dust concentration of submicron and nanometer levels. The invention successfully realizes the measurement of dust concentration of micron, submicron and nanometer levels, covers large particle size range, and has great market advantage.

The present invention relates to foaming equipment for preparing a foamed ceramic slurry. According to the foaming equipment, the foaming device comprises a fixed part and a rotary part, the outer stirring tooth group comprises outer stirring tooth sheets and outer separation rings, the inner stirring tooth group comprises inner stirring tooth sheets and inner separation rings, the outer stirring tooth sheets and the outer separation rings are fixed on the inner side of the outer housing, the upper cover is provided with a slurry outlet hole, the base is provided with a gas inlet hole and a slurry inlet hole, a shaft penetrates through the center of the base, one end of the shaft extends into the foaming device housing, the inner stirring tooth sheets and the inner separation rings are fixed on the outer side of the shaft, the outer stirring tooth sheets and the inner stirring tooth sheets are alternately arranged up and down, the internal of the foaming device housing is divided into at least three material mixing chambers, the bottom portion forms the primary section material mixing chamber relying on the base, the top portion forms the terminal end material mixing chamber relying on the upper cover, and the middle forms the middle material mixing chamber. The present invention provides the completely-new foaming equipment for preparing the foamed ceramic slurry.

The invention relates to an energy-saving low-carbon environment-friendly European-type grinding machine comprising an analytical machine on the upper part of a host machine, wherein the lower part of the host machine comprises an upper machine body, a middle machine body and a lower machine body; a discharge hole is formed in the top end of the upper part of the main machine; an airflow isolation loop is arranged on the lower part of the host machine; fine powder sending space is formed between the airflow isolation loop and the machine bodies of the lower part of the host machine; a feeding hole is installed in the outer side of the middle machine body; an air inlet is arranged in the lower machine body; a main shaft transmission device is installed in the middle machine body; the main shaft transmission device comprises a host machine belt wheel and a belt wheel transmission shaft; the host machine belt wheel is installed at the outside of the middle machine body; one end of the belt wheel transmission shaft is connected with the host machine belt wheel; the other end of the belt wheel transmission shaft is engaged with the other conical gear of the main shaft; a combined-type grinding roller lifting frame is installed on the main shaft; a cross arm shaft is installed on the combined-type grinding roller lifting frame; the upper end of a long-arm grinding roller shaft assembly is suspended on the cross arm shaft to form a movable fulcrum; a grinding roller capable of performing autogiration is installed at the lower end of the long-arm grinding roller shaft assembly; and a grinding ring with the position corresponding to that of the grinding roller is installed on the lower machine body. The energy-saving low-carbon environment-friendly European-type grinding machine is high in grinding efficiency, convenient to examine and repair and install, and long in service life, and a finished product produced by the energy-saving low-carbon environment-friendly European-type grinding machine is wide in particle size range.

A highly uniform sulphide microsphere with precisely controllable particle size and a preparation method therefor. The present method is based on the idea of a core-shell-shell structure, and comprises the two processes of primary "core" growth and secondary "layer-layer" growth. In the first growth step, sulphide nanospheres with stable particle size are obtained by means of stable reaction conditions; in the subsequent steps, the particle size of the nanospheres can be precisely controlled by means of controlling the timing and amount of the addition of the metal and sulphur source. According to said synthesis method, by means of a preset target particle size and precisely designing the experiment steps, sulphide nanospheres of the target particle size can be obtained; in addition, the adjustable particle size range of the present method is significantly increased, the adjustable range being 100 nm-1000 nm.

The invention discloses a rapid calculation method for mie scattering applied to dust particulate matter online monitoring. The method comprises the following steps that a particle scattering system is calculated, and a scattering coefficient table is formed; a particle size distribution mathematic model is built, and a reasonable initial value of a model parameter in an optimization algorithm is selected; particulate matter size distribution is subjected to inversion, and the particulate matter concentration is calculated. The particle theory scattering system is calculated in advance, a table look-up method is adopted for model parameter optimization calculation, repeated loop computation is avoided, and the calculation time is greatly shortened; a grid method is adopted in the algorithm for searching for a reasonable model parameter initial value for performing the first-time optimization algorithm, so that the global minimum value of a target function is accurately obtained; the model parameter initial value not measured at the first time is set as the model optimal parameter calculated the last time, iterations are reduced, and the operating speed is increased; the method has the advantages that the dust particulate matter size application range is large, and concentration change speed is large, and the method is used for a measuring system for performing real-time measurement of the dust particulate matter concentration.

The invention discloses a powder feeding mechanism, a powder feeding device and spraying equipment. The powder feeding mechanism includes a powder storage cavity (1), and a powder inlet (10) and a heating gas inlet are arranged above the powder storage cavity (1). (11), the powder storage cavity (1) is provided with a stucco, and the stucco includes a rotating body (3) and a brush body (2) fixed on the rotating body (3); Driven by the drive, it rotates along the rotation axis (4); there is a screen (5) under the paint, and the screen (5) is connected to the powder storage cavity (1); the brush body (2) protruding from the paint surface touches the powder storage The inner surface of the cavity (1) is matched with different brush body materials for powders of different particle sizes. The present invention can precisely control the powder feeding rate, realize a small amount of uniform powder feeding, and increase the range of powder feeding particle sizes. There is no requirement for fluidity, and it is suitable for the transportation of various powders.

The invention discloses a coal mine dust-removing device based on ultrasonic atomization and condensation. The coal mine dust-removing device comprises a negative pressure pipeline composed of an airblower, a vacuum pump and a connecting pipeline. The negative pressure pipeline is provided with a cyclone separator, an ultrasonic atomizer, a pressure valve and a condensation chamber sequentially.The cyclone separator is connected with the air blower. The vacuum pump is further connected with a dust collector. The condensation chamber is internally provided with an ultrasonic oscillator. A sound absorption sponge is further arranged at an outlet of the condensation chamber. The coal mine dust-removing device is easy to implement and high in efficiency, the content of coal dust in air in acoal mine roadway is effectively decreased, vicious accidents such as coal dust explosion are avoided, and safe conducting of the coal mine roadway exploiting process is ensured.

The invention discloses a highly uniform zinc oxide submicron sphere with controllable particle size and a preparation method thereof, belonging to the field of preparation of photonic crystal materials. The method adopts an alcohol-water system, reduces the temperature and pressure required for the synthesis of zinc oxide microspheres, and synthesizes zinc oxide polycrystalline submicron spheres with good monodispersity more cleanly. During the nucleation process, the nucleation process can be carried out rapidly by adjusting the temperature, the initial rotation speed, the zinc source and the amount of deionized water. During the growth process, the mass transfer is further controlled by introducing polyol to control the viscosity of the system, and zinc oxide submicron spheres with stable particle sizes can be obtained in one step. According to the above synthesis method, zinc oxide submicron spheres with a specific target particle size can be obtained only by changing the amount of zinc source and the type and amount of polyol. The adjustable particle size range of zinc oxide submicron spheres prepared by this method is significantly increased, and the controllable range is 100nm-800nm, and the monodispersity of zinc oxide submicron spheres is good.

The invention relates to a device and a method for determining parameters of a hydraulic engineering material and particularly relates to a device and a method for determining the permeability characteristic of coarse-grained soil with super large grain size (the d85 is larger than or equal to 60mm and smaller than or equal to100mm), and the IPC (International Patent Classification) codes of the device and the method are respectively E02D1 / 04 and E02D33 / 00. The device comprises a testing drum, an automatic compression system 11 and a pressure determining tube 12, wherein a plurality of pressure determining holes are formed in the wall of the testing drum, the pressure determining holes in the wall of the testing drum can be used as air discharge holes when air is discharged out of soil body from saturation, and the pressure determining holes and air discharge holes in the drum top and the drum bottom jointly accelerate air discharge, so that a sample can be saturated rapidly. Proven by a large number of experiments, the method has the advantages that hot water at the temperature of 25-40 DEG C is used, the sample with super large grain size cab be saturated rapidly and the influences on the chemical and physical stability of the sample are minimized.