84 results about "Particulate media" patented technology

The invention belongs to the technical field of part processing, and provides a multi-harmonic excitation conformal polishing and grinding device and method for ring parts, the device adopts a double-mass double-excitation four-machine reverse split driving mechanical vibration system, high-frequency large-amplitude compound vibration of a conformal container is realized, and the polishing and grinding efficiency is improved. Therefore, the particle medium is driven to perform efficient longitudinal spiral motion around the ring part; the rotary motion of the ring part cooperates with the geometric constraint of the conformal container, so that the relative motion between the particle medium and the ring part is improved, an alternating stress flow field is formed in the ring part, and the problem that the inner surface machining efficiency and the outer surface machining efficiency are inconsistent due to the splitting effect of the ring part on the particle flow field is successfully solved. By means of the method, the problems of low machining efficiency, uneven machining and poor surface quality existing in a traditional finishing machining method for the ring parts with the cartridge receiver and the flame tube as typical parts can be solved, and the machining cost is reduced while the machining precision and the surface quality of the ring parts are improved.

A method of forming a component utilizing material extrusion includes the steps of (1) delivering a hopper of particulate media formed of a primary material into an extruder, (2) selectively providing an infill material into the primary material within the extruder, (3) delivering a filament of the primary material and the infill material downstream to a nozzle where it is then deposited to form the component, and (4) a control associated with the nozzle selectively delivering the infill material into the primary material, or blocking a delivery of the infill material into the primary material dependent on an area in the component which is being formed.

The invention discloses a wet particle medium mechanical property numerical calculation method based on CFD-DEM multiphase flow coupling, and relates to the technical field of discrete element simulation technology and computer fluid dynamics, and the method comprises the following steps: firstly, obtaining initial information of a wet particle medium; secondly, establishing a geometric model of wet particles through a DEM solver; then, on the basis of the JKR theory, interaction parameters of the wet particles are obtained; then, on the basis of the geometric model and the interaction parameters of the wet particles, a fluid dynamics and discrete element method CFD-DEM coupling simulation model is built through a VOF coupling interface, and analogue simulation is conducted on the movement process of the robot foot paddle on the wet particle medium ground. Therefore, by adopting the numerical calculation method for the mechanical properties of the wet particle medium based on CFD-DEM multiphase flow coupling, the interaction among the wet particles can be accurately simulated, the simulation analysis precision and reliability of the wet particle medium are improved, and the dynamic simulation of the behavior of the wet particle medium is realized.

A device configured to be disposed within a granular medium to raise a layer thereof, the device having: a flexible envelope forming an internal volume; an inflatable element in the internal volume, interposed between the envelope's upper and lower surfaces, the element's inflation and deflation varying the internal volume; an injection device for filling the inflatable element with a fluid; the device being switchable from a first configuration having the inflated inflatable element occupy a first volume to a second configuration having the inflated inflatable element occupy a second volume greater than the first to deform the upper surface vertically to raise the granular medium's layer, and vice versa; the device further being switchable from the first or second configuration to a third configuration having the envelope's lower surface deform vertically to allow the device to ascend through the granular medium. Also, a method of deforming a granular medium layer.

The utility model discloses a magnetic drive pump under the condition of containing granular media, which is characterized in that an impeller is arranged at the front end of a pump shaft, an inner magneton is arranged at the rear end of the pump shaft, a first thrust plate, a first radial bearing, a second radial bearing and a second thrust plate are sequentially sleeved on the pump shaft between the impeller and the inner magneton from front to back, a bearing bush is fixedly sleeved on the pump shaft, and the first radial bearing, the second radial bearing and the second thrust plate are fixedly sleeved on the bearing bush. The first radial bearing and the second radial bearing are sleeved outside the bearing bush, a front boss is arranged at a front opening of the impeller, a rear boss is arranged at a rear opening of the impeller, a front outer opening ring and a front inner opening ring are fixedly sleeved on the front boss, the front outer opening ring is sleeved outside the front inner opening ring in a clearance mode, and the front outer opening ring and the rear outer opening ring are fixed on the pump body. The front inner opening ring is fixedly sleeved on the front boss of the impeller, the rear outer opening ring and the rear inner opening ring are fixedly sleeved on the rear boss, the rear outer opening ring is sleeved outside the rear inner opening ring in a clearance mode, and the rear inner opening ring is fixedly sleeved on the rear boss of the impeller.

The invention relates to a chromatography concentration method and device for a macromolecular dilute sample, belongs to the field of molecular chromatography concentration, and overcomes the inconvenience of laboratory instrument operation. When the macromolecular dilute sample mobile phase and the dry hydrogel particle stationary phase generate directional relative movement, the mobile phase solvent on the two-phase interface is continuously absorbed by the relatively excessive stationary phase, so that macromolecular solute with the particle size larger than that of the hydrogel particles is continuously subjected to concentration polarization enrichment on the interface; the concentration of macromolecular solutes on the interface is submerged and diluted by continuous supplementation of the relatively excessive mobile phase solvent following the interface to the interface; after passing through a chromatography path with enough length, the concentration of the macromolecular solute on the continuously moving interface is close to or reaches a highest equilibrium value under the superposition of two effects of enrichment and dilution, and the initial interface component of the mobile phase collected at the outlet of the chromatography column is a macromolecular concentrated solution close to or with the highest concentration multiple. The invention also discloses a macromolecular dilute sample chromatography concentration device consisting of the dry hydrogel particle medium and the chromatographic column.

There is a scent delivery device and method of manufacture thereof wherein a scent delivering granular media is disposed within an airtight or textile container. The granular media includes: free-flowing non-silica, non-garnet, and non-staurolite glacial remnant sand mixed in a drum with powdered orris root fixative physically bonded to the free-flowing non-silica non-garnet, and non-staurolite glacial remnant sand and a fragrance fixed to the orris root fixative. The airtight container is a clear glass jar with a lidded top in functional communication with a heating lamp such that heat from the lamp is directed to the container and thereby to the scent delivering granular media.

The utility model discloses a quick opening and closing type safety valve, which relates to the technical field of safety valves and comprises a valve seat and a valve cover, the valve cover is positioned on the valve seat, a valve rod is arranged in the valve cover, an adjusting nut is arranged at the upper end of the valve rod, and an electromagnetic coil mounted in the valve cover is arranged on the lower side of the adjusting nut. A spring located in the valve deck is arranged on the peripheral side of the valve rod, a guide sleeve is arranged in the valve seat and installed in the valve deck, and the lower end of the valve rod penetrates through the guide sleeve. Millisecond-level opening and closing of the valve clack and precise graded pressure relief are achieved through magnetic force driving, sudden drop of system pressure is avoided, the multi-stage stepped valve element is combined with the spiral flow channel to form centrifugal vortex, the surface of the valve element is actively washed, particulate matter deposition is effectively removed, flow resistance is reduced, the self-cleaning and wear-resisting characteristics are achieved, kinetic energy is buffered in cooperation with the damping ring, and the service life is prolonged. And the sealing structure is suitable for high-pressure, corrosive and particle-containing medium scenes.

The invention belongs to the technical field of tube plate expanded connection, and discloses a solid particle medium tube plate expanded connection method and device. By means of cooperation of the stud and the nut, when the nut is rotated, the plunger moves upwards, solid particle media are compressed under limiting of the pressing plate, then pressure is applied to the high-pressure-resistant rubber ring wrapped in the pipe blank, the pipe blank is deformed through rubber, the pipe blank is tightly embedded into an annular groove formed in a plate hole, and a firm mechanical lock catch is formed; and the expanded connection process is completed. The invention solves the problems that the pipe wall is easy to damage and the surface quality is poor when the traditional pipe expander is used for connecting; the problem that the low-plasticity metal tube blank is difficult to deform due to expansion joint is solved, and the connection quality of the tube plate and the tube is effectively improved. The solid particle medium is used, and the high-pressure-resistant rubber is sleeved on the inner surface of the pipe blank, so that the wall thickness of the pipe blank is uniformly distributed during plastic deformation, the stress distribution is reasonable, and the connection quality is further improved.

The invention relates to the technical field of magnetic pumps, in particular to a magnetic pump capable of conveying a particle-containing medium, which comprises a pump body, an impeller, a magnetic power mechanism and a medium separation mechanism, the medium separation mechanism is provided with a first medium inlet, a second medium inlet, a first medium outlet and a second medium outlet, the medium separation mechanism is used for separating a first particle-containing medium at the first medium inlet into a second particle-containing medium and a particle-free medium, and the magnetic power mechanism is provided with a medium channel communicating with the second medium outlet and the pump cavity; the particle-containing medium is separated to form a particle-free medium, then the particle-free medium enters the magnetic power mechanism, the medium flowing effect of the magnetic power mechanism towards the direction of the pump cavity is achieved, particles in the medium in the pump cavity are prevented from entering the magnetic power mechanism, and meanwhile the particle-free medium is separated according to the characteristics of the particle-free medium. And the magnetic power mechanism can be additionally cooled, lubricated and the like.

Provided is a method for industrially advantageously producing an organic acid salt from which a perovskite-type composite oxide having a small particle diameter and a high crystallinity can be obtained, the method comprising mixing and reacting a solution (solution A) containing any one component of an organic acid, an A-site element compound, and a B-site element compound with a solution (solution B) containing two components of the organic acid, the A-site element compound, and the B-site element compound to produce an organic acid salt, wherein the two components are not contained in the solution A. The method for producing the organic acid salt is characterized by firstly feeding, into a reaction vessel, either one of the solution A and the solution B and a granular medium in an amount of 5.0-95.0 vol% relative to the volume of the one solution, and then stirring the solution and the granular medium in the reaction vessel and therewhile mixing and reacting the solution in the reaction vessel with the other of the solution A and the solution B.

This invention discloses a variable stiffness tactile detection sensor for marine weld joints based on luminous flux modulation, belonging to the field of industrial inspection and tactile sensing technology. It includes: an integrally molded silicone body, a circular circuit board, a top rigid support, and an optical modulation assembly. The silicone body has an integrally molded central optical cavity, with a clamping cavity area formed outside the central optical cavity. The central optical cavity is surrounded by side walls and a lower wall, with the side walls connected to the outer wall of the silicone body via connecting sections. The circular circuit board is mounted at the lower part of the central optical cavity and has a light-emitting unit and multiple photosensitive units disposed thereon. The optical modulation assembly includes at least two polymer-dispersed liquid crystal films, which are arranged in the optical path area between the light-emitting unit and some of the photosensitive units to modulate the luminous flux distribution within the central optical cavity. The clamping cavity area is filled with particulate medium to form a particulate clamping variable stiffness structure. The top rigid support is mounted on the upper part of the central optical cavity and has a negative pressure connection interface communicating with the clamping cavity area. This enables the detection of multi-dimensional tactile features of the weld joints.

System for measuring the moisture content of a granular medium. This description relates to a system (1) for measuring the moisture content of a granular medium (2) comprising a collection element (3) intended to be placed in the granular medium (2) in contact with the granular medium (2), and configured to collect water present in the granular medium (2), a reservoir (14) for receiving the collected water, moisture sensors (16) in regions at least partially distinct from the granular medium (2), at least one temperature sensor (24), at least one conductivity sensor (26) configured to measure the conductivity of the water received in the reservoir (14), and transport means (18, 21) configured to transport water from the reservoir (14) to the conductivity sensor (26). Figure for the abstract: Fig. 1

The invention belongs to the technical field of chemical equipment, and relates to an orifice flow disc type liquid distributor suitable for a high-viscosity or granular medium and a use method. The orifice flow disc type liquid distributor comprises an orifice flow disc, an outer cylinder is arranged on the orifice flow disc, air rising holes and liquid distribution holes are evenly formed in the orifice flow disc, the liquid distribution holes are distributed around the air rising holes, air rising pipes are arranged on the air rising holes, liquid baffles are arranged on the air rising pipes, the liquid distribution holes are of an inverted-cone-shaped structure, rib plates are arranged below the liquid distribution holes, and the rib plates are arranged on the outer cylinder. Liquid distribution plates are arranged at the lower ends of the rib plates. The liquid distribution holes of the inverted-cone-shaped structure are adopted, liquid flowing resistance can be reduced, the diameter of the upper end is large and can rapidly receive liquid in the liquid distribution groove, the diameter of the lower end contracts, local acceleration can be formed, kinetic energy is more stable when the liquid flows out, and uneven liquid outlet caused by flow fluctuation is avoided.

The present invention provides a short-process particulate medium forming method and device for a dissimilar alloy multi-layer honeycomb composite plate. The specific steps are as follows: surface pretreatment of the alloy plate; laying out the alloy plates; performing metallurgical bonding on the pre-prepared dissimilar alloy composite plate by diffusion bonding: placing the dissimilar alloy composite plate in a resistance furnace and heating the resistance furnace to the preset temperature for diffusion bonding in an equal-gradient manner; pressing the left punch and the right punch into the first cavity and the second cavity respectively, and controlling the current frequency by changing the press to perform pulsed pressure on the pressing plate, the die, the punch in the forming device and the contact area with the surface of the dissimilar alloy composite plate; performing heat preservation and pressure holding treatment on the dissimilar alloy composite plate; forming the dissimilar alloy composite plate with solid particles; cooling in a gradient manner and unloading to obtain the dissimilar alloy multi-layer honeycomb composite plate. The present invention integrates the forming preparation and the diffusion bonding of adjacent metal layers. The metallurgical bonding effect of the diffusion bonding is uniform and the forming efficiency is relatively high.

The invention discloses a method and system for designing a targeted structure of a thin-walled ring vibrating polisher wall, and relates to the technical field of surface rolling and finishing processing, wherein the method comprises: initializing container parameters of a thin-walled ring vibrating polisher; constructing an EDEM simulation model, performing discrete element simulation on the initialized container parameters, and obtaining simulation results; establishing a targeting capability index based on the energy state density of a granular medium; obtaining optimal container motion parameters based on the dynamic behavior of the energy state density of the granular medium and the targeting capability index; obtaining the sensitivity of the container wall targeting structure using the targeting capability index as a response value, and obtaining design variables based on a sensitivity threshold; fitting an objective function based on the targeting capability index using the design variables as constraints, obtaining optimal design parameters of the container wall targeting structure by solving the design variables, and completing the design of the thin-walled ring vibrating polisher wall targeting structure in combination with the optimal container motion parameters.

The utility model discloses a shield pump for conveying granular media, which comprises a connecting seat, the front end of the connecting seat is connected with a pump shell through a flange, the rear end of the connecting seat is fixedly connected with a machine shell, a shaft sleeve is rotatably arranged in the middle of the connecting seat in a penetrating manner, and one end, facing the pump shell, of the shaft sleeve is fixedly connected with a baffle ring. The baffle ring is located in the pump shell, a plurality of arc-shaped grooves are formed in the end face, facing the shaft sleeve, of the baffle ring, a rotating shaft fixedly penetrates through the shaft sleeve and the baffle ring jointly, and the end, located in the pump shell, of the rotating shaft is fixedly connected with an impeller. In the process of conveying granular media, the rotor can drive the baffle ring to rotate in the pump shell, so that fine particles entering the gap between the baffle ring and the connecting seat can be thrown out of the baffle ring under the action of the arc-shaped groove, and the fine granular media entering the shielding cover from the fit gap between the shaft sleeve and the connecting seat are reduced; therefore, the probability that the shaft sleeve is stuck and the shielding sleeve is damaged is reduced, and the use effect is good.

The present invention relates to a low-noise three-screw waste oil pump with a mortise and tenon joint structure. A driving screw and two driven screws are housed within a screw bushing. The screw bushing covers the spiral sections of the driving screw and the two driven screws, forming a spiral sealing chamber. The axial length of the screw bushing is greater than the spiral meshing portion formed by the driving screw and the driven screws, forming a screw bushing inlet cavity and a screw bushing inlet cavity. When liquid enters and exits the spiral sealing chamber, a buffer zone is formed with the pump inlet and outlet cavities, thereby reducing vibration and noise. The driving screw and the driven screw adopt a split structure and a mortise and tenon joint. The spiral sections and the axial force balancing portion are made of different materials, achieving low cost and high wear resistance. The present invention is very suitable for use in environments with limited space, low-noise transportation of gaseous and particulate media, rapid maintenance and replacement, and high requirements for overall size and weight. It has very important market economic value.

An enhanced activated sludge system for removing PFAS from a flow of wastewater and / or landfill leachate includes at least one bioreactor configured to receive a flow of wastewater and / or landfill leachate and configured to promote growth of biological flocs. The at least one bioreactor mixes the biological flocs with a particulate media to form biological flocs enmeshed with the particulate media which adsorb and remove a majority of the PFAS from the flow of wastewater and / or landfill leachate and outputs a flow of biological flocs enmeshed with the particulate media having the majority of PFAS adsorbed thereto and treated wastewater and / or landfill leachate having a majority of the PFAS removed. A separation subsystem separates the biological flocs enmeshed with the particulate media having the majority of PFAS adsorbed thereto from the treated wastewater and / or landfill leachate and outputs a flow of treated wastewater and / or landfill leachate having a majority of the PFAS removed.

The invention provides a forming and forming method and mold for a solid particle integrated fiber-reinforced metal laminate, and relates to the technical field of composite board processing, and the forming and forming method comprises the following steps: paving a pretreated metal board and a fiber-reinforced prepreg to obtain a fiber-reinforced metal laminate sample in a semi-cured state; the sample is positioned and installed in the forming female die, and the center of the sample coincides with the axis of the punch in the forming process; the edge pressing charging barrel and the forming female die are connected through a disc spring, the edge pressing charging barrel is filled with quantitative solid particle media, and a guide ring and a forming punch are assembled; the mold is heated to a prepreg forming temperature interval, and the punch compacts the medium to achieve plastic forming; and synchronously raising the temperature to a curing temperature to complete curing of the prepreg. Forming and curing processes are integrated in a single mold, the problems of interface pollution and thermal stress accumulation of traditional step-by-step manufacturing are solved by utilizing the flexible pressure transfer characteristic of granular media, and high-precision forming and interface combination strengthening machining of complex curved surface components are achieved.

The invention discloses a three-dimensional particle medium force chain identification method, which comprises the following steps: traversing all particles in a three-dimensional particle medium, and calculating the stress tensor of each particle to obtain the minimum principal stress of each particle; the average value of the minimum principal stress of all the particles is calculated, and the particles with the minimum principal stress larger than the average value of the minimum principal stress of all the particles in absolute value are screened out to serve as high-stress particles; any one high-stress particle is selected as an initial particle of a force chain; taking the direction vector of the minimum principal stress of the initial particles as the extension direction of a force chain; particles meeting the collimation requirement are searched from the particles adjacent to the initial particles to serve as potential force chain particles; selecting the particles with the minimum principal stress from the potential force chain particles as effective force chain particles; and taking the effective force chain particles as initial particles, and repeating the steps until the effective force chain particles do not exist, thereby obtaining a force chain with a certain length. According to the method, the three-dimensional particle medium force chain can be quickly and accurately obtained.

The invention belongs to the technical field of barreling finishing machining of blisk parts, and aims to solve the problems that air inlet and exhaust edges of blisk parts are over-polished, blade roots are under-polished, and machining is not uniform. The invention provides a particle medium flow field regulation and control method for blisk spiral vibration composite polishing and grinding. A multi-target evaluation model of a blisk wear depth average value and a variable coefficient is constructed based on an entropy weight method and a subjective assignment method; optimal process parameters are selected through orthogonal simulation of container size parameters and motion parameters; a container wall configuration optimization method is provided for non-uniformity of the area from the blade root to the blade tip, and optimization design is conducted on container wall configuration through a response curved surface, a neural network, a genetic algorithm and the like; in order to solve the problem of excessive polishing of air inlet and exhaust edges, a blade expansion configuration regulation and control method is provided, and the machining uniformity and consistency of the blisk are comprehensively achieved. According to the invention, high surface integrity and uniform consistency polishing and grinding of the blisk are realized.

The invention relates to a method for filtering water by means of a filter (10, 10'') comprising at least one granular medium forming a layer of granular media (14), which is submerged and placed in a tank (18), the filtering method comprising: - at least two steps of cleaning (2) the filter, the filtering method being characterised in that it comprises at least one step of unclogging (4) the granular media, comprising the following steps: - stopping the filtering of the water; - at least once, placing the grains forming the granular media in suspension by means of at least one injection of at least one unclogging fluid into the layer of granular media (14); - returning the granular media to the state in which it forms a layer of granular media (14) of the suspended material previously retained in the layer of granular media (14); and - resuming the filtering.

The invention discloses a tri-eccentric U-shaped metal butterfly valve suitable for particle media, and relates to the technical field of butterfly valves, the tri-eccentric U-shaped metal butterfly valve comprises a valve body, a driving assembly, an adjusting assembly, a valve assembly and a driving rod, the driving assembly is fixedly connected with the valve body, and the driving assembly comprises a fixing plate and a support. In the process that the butterfly valve is put into use, the motor is started, along with continuous operation of the motor, the first friction ring continuously rotates, so that the second friction ring continuously bears force, that is, the threaded pipe can always keep a tightening state on the bolts on the two sides under the action of friction force, and through the continuous tightening state of the bolts, the safety of the butterfly valve is improved. The two sets of first sealing flanges and second sealing flanges can be always kept in a stable pressing and tightening state, so that the sealing state of the connecting position of the butterfly valve is stable, leakage caused by loosening of the connecting position of the butterfly valve in the using state of high-speed particle medium fluid for a long time is avoided, and the using stability of the butterfly valve is effectively improved.

The utility model relates to the field of air suspension blast pumps, in particular to an exhaust assembly for an air suspension blast pump, which comprises a fixed-range plate, a valve plate and a valve seat, the fixed-range plate, the valve plate and the valve seat are all positioned in the blast pump, the blast pump comprises a cylinder cover and a cylinder body, and the fixed-range plate, the valve plate and the valve seat are matched between the cylinder body and the cylinder cover in an abutting manner. A first installation groove is formed in the valve seat, the range plate and the valve block are both located in the first installation groove, the valve block is installed between the bottom end face of the range plate and the bottom end face of the first installation groove in an abutting mode, a ventilation hole used for ventilation is formed in the valve seat, an airflow hole is formed in the valve block, and an airflow groove is formed in the bottom end face of the first installation groove. The airflow hole, the vent hole and the airflow groove are communicated with one another, and in the working process of the valve block, the valve block guides particle media to enter the airflow groove, so that the particle media are deposited, and the effect of cleaning gas is achieved.

The present invention provides a device (100) for moving on a particulate medium comprising one or more ramps. The device comprises: a body (104) having a front portion (A) and a rear portion (B) in a longitudinal direction; and one or more rotatable members (102, 102a, 102b), each rotatable member for rotational movement relative to the body (104) about a respective axis of rotation having a component aligned with the longitudinal direction and externally exposed to adjacent portions of a particulate medium on which the device (100) is to be disposed. The one or more rotatable members (102, 102a, 102b) each include one or more helical fins (106) extending outwardly from the axis of rotation such that rotation of the one or more rotatable members (102, 102a, 102b) is configured to move the device (100) on the particulate medium. A first longitudinal distance between a center of mass of the device (100) and the front portion (A) of the body (104) is less than a second longitudinal distance between an expected center of contact between the device (100) and the particulate medium and the front portion (A) of the body (104) when the device (100) is located on a flat portion of the particulate medium.

The invention provides an impeller for a granular medium delivery pump and the granular medium delivery pump. The impeller comprises blades and a cover plate, and a plurality of short back ribs are arranged on the side face of the periphery of the cover plate at intervals in the rotating direction. According to the impeller, the short back ribs are arranged on the cover plate of the impeller, particulate matter entering the cavity between the cover plate and the protective plate can be effectively reduced, the particulate matter is prevented from entering the cavity along with centrifugal force brought by rotation of the impeller, and a flow passage component is effectively protected.

The utility model discloses a piston sealing assembly which comprises a piston head body, a sealing groove is formed in the circumferential face of the piston head body, an O-shaped ring tightly connected with the sealing groove is embedded in the sealing groove in a sleeved mode, and the highest point of the O-shaped ring protrudes out of the circumferential face of the piston head body. Scraping lips are arranged on the circumferential face of the piston head body and close to the top edges of the two side end faces, and the highest points of the scraping lips protrude out of the circumferential face of the piston head body. The highest points of the scraping lips on the two sides of the piston head body protrude out of the circumferential face of the piston head body, and the scraping lips on the two sides of the piston head body make contact with fine particles attached to the inner wall of a plunger rod cylinder barrel earlier than the piston head body. The scraping lip protruding out of the piston head body can scrape away fine particles attached to the inner wall of the cylinder barrel, the fine particles are prevented from remaining on the inner wall of the cylinder barrel, then the influence of the fine particles on the piston and the cylinder barrel is reduced, the sealing performance of the plunger type cylinder in the working environment with particle media is improved, energy loss is reduced, and the service life of the plunger type cylinder is prolonged.

A process for reforming the fly ash by heating a raw fly ash powder that contains the unburned carbon and thereby decreasing the content of the unburned carbon, characterized in that (a) as means for heating the raw fly ash powder, use is made of a heating unit that heats the raw fly ash powder by passing it through a heated medium-fluidized bed, (b) a high-temperature gas stream is passed through the heating unit to form the heated medium-fluidized bed and to fluidize and convey the raw fly ash powder that is thrown into the medium-fluidized bed, (c) the flow rate of the high-temperature gas stream is so set that the raw fly ash powder thrown into the heating unit is all heated in the medium-fluidized bed and is taken out from a take-out port provided at an upper part of the heating unit but that the particulate medium forming the medium-fluidized bed is not discharged from the take-out port, (d) the fly ash powder after heated and discharged from the take-out port of the heating unit is introduced into an air classifier where it is separated into a fine powder and a coarse powder, (e) the fine powder separated by the air classifier is recovered as the reformed fly ash, and (f) the coarse powder separated by the air classifier is measured for its content of the unburned carbon and when the measured value is larger than a predetermined threshold value, the coarse powder is introduced again into the heating unit so as to be heated again and when the measured value is smaller than the threshold value, the powder is recovered as the reformed fly ash.