摘要:
Described are microparticle fractionating apparatus and methods of fractionating microparticles. Multiple electrodes may be used to charge droplets when separating and collecting microparticles based on a result analyzed by an optical methodologies. A first electrode may be used to charge a sample fluid, and a second electrode used to apply additional charge near a droplet break-off point.
摘要:
There is provided a microparticle sorting device that automatically optimizes a fluid stream.There is provided a microparticle sorting device that includes a voltage supply unit that supplies a driving voltage to a vibratory element that applies vibration to an orifice that produces a fluid stream, a charge unit that imparts charge to at least some droplets ejected from the orifice, deflecting plates, arranged opposing each other with the fluid stream S therebetween, that vary a travel direction of the droplets, and a first image sensor that acquires an image of the droplets passing between the deflecting plates. The microparticle sorting device is equipped with a controller that detects the droplets in the image, sets a standard band corresponding to a width of the droplets before imparting the charge, and controls the driving voltage of the voltage supply unit so as to further decrease a quantity of the droplets detected in areas within a designated number of pixels from the standard band from among the droplets after imparting the charge.
摘要:
A method and a device for electrostatically separating polyvalent granular insulating materials that have good properties, are energy efficient, and easily adapt to ambient atmospheric conditions and to physiochemical properties of the granules to be separated. The method includes: a) injecting a current of air between two electrodes in a separation chamber defined by walls and having an air inlet and outlet; b) placing the granule mixture, made of different materials, into the air current; c) controlling the air current so that the granules levitate in the air current in a turbulent mode and become electrically charged by contact therebetween and/or by contact with the walls of the separation chamber; d) generating an electric field between two electrodes, substantially perpendicular to the direction of the air current, such that the charged granules in c) move, either in the direction of the electric field if the granules are positively charged or in the opposite direction if the charge thereof is negative; e) adhering the charged granules to the surface of the electrodes; and f) discharging and collecting the granules adhering to each electrode.
摘要:
A method of classifying fine particles includes: introducing a fine particle dispersion containing the fine particles to a micro flow channel having an inlet part and a collection part from the inlet part; moving the fine particles to an inner upper side of the micro flow channel by an electric field applied in a gravitational direction; and delivering the fine particle dispersion in a laminar flow state to the collection part. The delivering step includes classifying the fine particles according to differences in settling velocity among the fine particles.
摘要:
A system for transporting and selectively sorting particles includes a first wall and a traveling wave grid extending along the first wall. The system includes a second wall having a passage extending therethrough and a gate operatively associated with the passage. A controller is adapted to output a multi-phase electrical signal. The controller is in communication with the traveling wave grid and the gate. A method of using the system is also provided.
摘要:
An apparatus for the electrostatic separation of a mixture of particles that exhibit difference in electrical conductivity comprising: a rotating roll with a conductive surface to which conducting particles lose their charge; feeding means for feeding the mixture of particles onto the conductive surface; an ionising electrode for ionising individual particles in the mixture of particles; a first static electrode having the same polarity as the ionising electrode and which serves to generate a static electric field, the first static electrode being located sufficiently close to the ionising electrode that the static field acts on the particles immediately after they are ionised; and splitter comprising a leading edge over which a conductor fraction stream flung from the rotating roll following charge decay in these particles passes, wherein the leading edge of the splitter is positioned beneath the first static electrode so that the conductor fraction remains under the influence of the static electric field as it is collected.
摘要:
A process for separating organic and inorganic particles from a dry mixture by sizing the particles into isolated fractions, contacting the sized particles to a charged substrate and subjecting the charged particles to an electric field to separate the particles.
摘要:
An electrostatic separation apparatus or system is provided for separating a particle mixture into two constituent species. The system includes a distributor for differentially tribocharging the particle species forming the mixture and supplying the charged mixture to a plurality of electrostatic separation cells. Each cell includes at least one separator having an inlet, a separation chamber having an electric field zone for drawing selected charged particles from the particle mixture, a collector, and a transition outlet. The length of the electric field zone is selectively adjustable for varying the charged particle drawing action. A curtain gas flow introduced into the separation chamber carries the selected charged particles drawn from the particle mixture in the electric field zone to the collector. Flow vanes or straighteners are provided for both the particle mixture flow and the curtain gas flow to reduce turbulence in the separation chamber and improve separation efficiency. The collector includes a discharge outlet for discharging the selected charged particles to a first collection bin. The transition outlet receives the remaining particle flow and delivers it to a second collection bin for recovery or to a second separator to collect any remaining selected charged particles. The transition outlet reforms the flow to create turbulence to further tribocharge the particles prior to entering the second separator. A related method of particle separation is also disclosed.
摘要:
The invention concerns a process as well as an apparatus for separating broken goods, consisting of broken nibs or beans and their shells and especially the separation of broken cacao beans (nibs) from the cacao shells in an electrostatic manner. In this connection the broken goods are electrostatically charged in fractionated configuration within a charging area between two differently charged electrodes and thereafter the beans and shells are differently deflected on downfalling within a homogeneous electrical field generated by two other electrodes defining the downfall section. The broken beans and shells then separated by means of a mechanical separator into two different product streams, consisting essentially of a stream of broken nibs and a stream of shells, which product streams are then removed. Excellent results in separating the above mentioned particles are gained using a relatively small and inexpensive equipment, when such results could up to now only be received by means of costly winnowing machines.
摘要:
An apparatus and a process for subjecting a free falling stream of particles to an electrostatic field, between two rows of oppositely charged electrostatic rotating electrodes to effect a separation between particles of different electrostatic properties; the electrodes and cleaning brushes being suspended vertically and driven from their upper ends and having free lower ends. The electrode bearings are gently flushed with air from inside the electrodes and brushes to minimize the accumulation of dust thereon. The feed stream is baffled to minimize any lateral movement of the feed particles. The electrodes are fitted with commutator mechanisms to permit efficient and unchanging electrical charging of the electrodes without a separate connection from the power source to each electrode, i.e., the charging is from one to the next adjacent electrode.