95 results about "Particle segregation" patented technology

The present invention concerns a method for separating at least one species of biological entities from a sample solution, by contacting the sample with a matrix of magnetic particles formed on a substrate such as a sheet a gel, etc. The particles in the matrix are coupled to entities capable of specifically binding to the species of biological entities to be separated. The separation is carried out either for detection purposes for obtaining separately each species of biological entities or for synthesis purposes. The invention further concerns matrices of magnetic particles formed on various substrates and kits for use in the method.

A method and apparatus for separating nanometer-sized particles of a powder. The method includes (a) feeding the powder particles into a pressurized gas stream which carries the particles into a first stage filter device of a multiple-stage separator system; (b) operating the first stage filter device to remove and collect coarse particles and a filter device in at least another stage to remove and collect finer particles of the powder; the filter device having a dynamic filter which is composed of (b1) a mesh of a multiplicity of openings with the opening size at least two times larger than the average size of the particles, (b2) vibration devices or shakers to shake off the particles that may otherwise clog up the mesh openings, (b3) size sensors to measure the sizes of the particles collected by the filter devices, and (b4) a controller to regulate the operations of the shakers and sensors in order to form desired dynamic mesh holes for the purpose of filtering out the coarse particles in the first stage or the finer particles in another stage; and (c) operating a dust collector to exhaust the residual gas, allowing the finest particles of the powder to be separated and collected.

The invention provides a method and a device for reducing and baking for high-valent manganese minerals. The method comprises the following steps: (1) combusting combustible gas and air in a hot blast furnace through a nozzle, controlling coefficient of excess air to ensure that the gas of the hot blast furnace is required reduction atmosphere and temperature, and introducing a fluidized roaster; (2) finely grinding manganese minerals, feeding the manganese minerals into a suspension preheat assembly for sufficient heat exchange in several times, separating gas and mineral powder granules, and feeding the granules into the fluidized roaster for a reduction reaction; and (3) controlling the CO content and solid-gas ratio in the fluidized roaster; reducing manganese mineral powder in the fluidized roaster into acidsoluble manganous oxide, and discharging the manganous oxide from a solid material outlet of a cyclone preheater in the last stage. The device comprises a feed assembly, the suspension preheat assembly, the fluidized roaster, a dust-removal exhaust assembly, a gas feed assembly and a combustion assembly. The method and the device have the advantages of simple and compact structure, low cost, simple and convenient operation, good reduction effect, low energy consumption and the like.

Apparatus and methods for size-specific detection of particles entrained in fluids are provided. A particle size selector separates particles entrained in a sample fluid stream using a curved channel. Shroud fluid streams are interposed between the sample fluid stream and walls of the channel. Centrifugal forces arising from fluid flow through the curved channel separate differently-sized particles into different transverse sections of the channel. A detector downstream from the particle size selector specifically detects particles in one or more transverse sections of the channel.

Methods for controlling particulate segregation comprising providing a mixture of an aqueous tackifying composition with a treatment fluid; slurrying the mixture with a first type of solid particulates and a second type of solid particulates and wherein the first type of solid particulates have a tendency to segregate from the second type of solid particulates when slurried into a liquid; and, placing the slurry into a portion of a subterranean formation. Methods for controlling particulate segregation comprising providing a treatment fluid; at least partially coating with an aqueous tackifying composition: a first type of solid particulates and a second type of solid particulates and wherein the first type of solid particulates have a tendency to segregate from the second type of solid particulates when slurried into a liquid; slurrying the two types of particulates into the treatment fluid; and, placing the slurry into a portion of a subterranean formation.

A system to facilitate separation and concentration of particles based on centrifugal force on suspended particles, including biological matter, which are made to flow in a vortex structure is provided. The centrifugal force urges larger particles to collect along outer portions of the vortex flow. Conversely, within a vortex structure, a radial hydrodynamic pressure drop is also amplified to urge smaller particles toward inner portions of the vortex flow. This force created by the pressure can reach magnitudes that encourage a sharp cut-off and improved resolution discrimination between particle sizes. Thus, separated streams of particles can be collected with both increased concentration and purification.

A method is provided for detection of an airborne contaminant in a atmospheric environment. The method comprises capturing an air sample from the atmospheric environment; separating candidate particles of interest from particles of non interest in the air sample; generating an image of the candidate particles; identifying a contaminant from among the candidate particles by comparing the image of candidate particles with a plurality of stored reference images, each of which reflects a respective identified contaminant; and notifying a remote third party in response to detecting a contaminant from among the candidate particles.

A method of making particles of either spherical or cylindrical geometry with a characteristic diameter less than 50 nanometers by mixing at least one structure directing agent dissolved in a solvent with at least one amphiphilic block copolymer dissolved in a solvent to make a solution containing particles, where the particles can be subsequently separated and dispersed in a solvent of choice.

Methods and apparatuses for separating metal values, such as nickel and nickel compounds, from mineral ores, including lateritic ores are disclosed. The method includes providing a mixture of particles (e.g., crushed and sized ore) that is composed of at least a first group of particles and a second group of particles. Group members have similar chemical composition, while particles belonging to different groups have dissimilar chemical compositions. The mixture of particles is exposed to microwave/millimeter wave energy in order to differentially heat the first and second group of particles, thereby increasing differences in magnetic susceptibility between the first and second group of particles. The mixture of particles is then passed through a magnetic field gradient, which causes the particles to separate into magnetic and non-magnetic fractions.

The invention provides a method for preparing rare earth oxide doped tungsten and molybdenum spherical powder for 3D printing, and belongs to the technical field of powder metallurgy powder preparing.According to the specific preparing method, a low-temperature solution combustion synthesizing method is adopted for preparing rare earth oxide/tungsten oxide (molybdenum oxide) composite powder, then, hydrogen reduction is conducted to obtain rare earth oxide doped nano tungsten (molybdenum) powder, then, atomizing granulation equipment is used for granulating nano powder, and after the nano powder is roasted, ground and screened, the spherical tungsten (molybdenum) powder for 3D printing can be obtained. Raw materials are simple and easy to obtain, the equipment is simple, the technology israpid, a large number of products can be prepared within the short time, and the method is suitable for large-scale production. The rare earth oxide in the prepared tungsten and molybdenum sphericalpowder can be evenly scattered, particles are fine, oxide particle segregation cannot happen, and the rare earth oxide adding amount can be adjusted through the low-temperature solution combustion synthesizing process. The prepared tungsten and molybdenum spherical powder is excellent in sphericity degree and mobility and is extremely suitable for the 3D printing technology.

The invention discloses a method and an apparatus for exact metering and volumetric filling of dry powder medicament doses into preformed containers, which are adapted for administration by means of a dry powder inhaler (DPI). The filling apparatus of the invention includes at least a bulk powder source (401), a feeding chamber (134) and a receptacle (110) providing the volume for a specified load mass (202) of dry powder. The bulk powder source releases a portion of powder discontinuously to the feeding chamber, but is disconnected from the feeding chamber and receptacle during the filling operation. The filling apparatus further presents a plane surface (103) in contact with the movable feeding chamber and provides a hard-wearing, low friction coating for reducing dynamic friction and powder retention.

Apparatus and process for separating particles of wollastonite ore and other aspect ratio materials into a relatively high aspect ratio constituent and a relatively low aspect ratio constituent includes an initial step of either size reducing ( 2 ) the material into particles of the aspect ratio material having a size less than a preselected maximum size or alternatively providing such particles of the aspect ratio material. The particles of the aspect ratio material are then separated ( 4 ) into a plurality of particle streams based on particle size such that each particle stream is formed substantially from particles within a particular range of particle sizes. Then, the particles in at least one particle stream are sorted ( 6 ) based on particle shape into the relatively high and relatively low aspect ratio constituents. The particle separation step ( 4 ) is preferably performed using mesh screening apparatus. The shape sorting step ( 6 ) is preferably performed using apparatus for separating grain.

The invention discloses a method for distributing raw materials with high zinc content in a blast furnace with a bell-less top, which comprises the following steps of: (1) controlling ore batch weight to be greater than a critical value, and ensuring that the average thickness of ore at the furnace throat is 8 to 10 percent of the diameter of the furnace throat; (2) adopting a material distribution mode from a small angle to a large angle increasingly at distributor chutes on the furnace top, and ensuring that small particle burden and powder caused by mass flow particle segregation are distributed from the center of the blast furnace to a part 1/3 away from the edge of the furnace wall when a material tank discharges materials; (3) selecting double-ring single pile top large-angle distribution for ore and coke gears, distributing outer-ring ore according to the maximum angle, ensuring that the ore and coke angular difference is -2 degrees and the angular difference of the inner and outer rings of the ore and the coke is 6 degrees, controlling the materials distributed in the inner ring to account for 50 to 60 percent of the total burden, making the ring number of the outer ring distribution at least two, and ensuring that the outer-ring distribution pipe top covers the inner-ring distribution pipe top; (4) adopting a positive packaging and ore-coke unequal line packaging method; and (5) regularly performing tank turning operation on tank-combined blast furnace with the bell-less top, and controlling 4 to 5 tank turning cycle periods in a material column.

The invention belongs to the technical field of ultrasonic non-destructive testing of composite materials, and in particular relates to a comparative test block for ultrasonic testing of structure uniformity of the composite materials and a preparation method of the comparative test block. The comparative test block is formed through internally placing the composite materials which are different in volume fractions with body materials in different areas of particle reinforced metal matrix composite body materials, and mainly prepared by adopting cold isostatic pressing, hot isostatic pressingand machining; an ultrasonic detector is used for testing the test block, so that testing waveform diagrams in different volume fraction areas of particles can be obtained, in the actual composite material testing, a testing result is compared with a comparative test block map and combined with the theoretical calculation, and the particle segregation degree inside the composite materials can be known; the comparative test block provided by the invention provides true and effective contrast and evaluation standards for ultrasonic testing of the structure uniformity of the composite materials to improve the testing efficiency.

The invention discloses a preparing method of sulfur dioxide to sinter troilite through circulated bed in the chemical raw material preparing technological domain, which is characterized by the following: adopting ferric oxide with 40-50 um even particle diameter as bed material; making inner bed material lie rapid fluidization condition through adjusting fluidization wind quantity; heating bed material at 845-855 deg.c; improving evenness of inner bed temperature and composite gas-solid as well as one-set product; guaranteeing enough reacting time for fine particle separated from circulated fluidization bend reactor; allocating separating system and return system; separating fine particle from gas; sending the separated material to reactor continuously.