81results about How to "Improve powder selection efficiency" patented technology

The invention discloses a vertical grinding mill, wherein a vertical grinding mill body is fixed on a concrete foundation; a grinding table is driven by a rotary power source and horizontally placed at the bottom of the vertical grinding mill; a discharging clearance exists between the grinding table and the inner wall of the vertical grinding mill; a non-grinding region in the center of the grinding table is of an upwards-raised cone; an edge grinding region is of an arc surface which is gradually raised upwards; and a grinding roller extends from the side of the vertical grinding mill to the upside of the grinding region of the grinding table and obliquely fixed downwards. The vertical grinding mill provided by the invention has the advantages of small grinding table diameter, high grinding table rotating sped, high work efficiency, low energy consumption and the like.

The invention disclose a separator of a coal mill which includes a motor, an inner cone, an outer cone and a cover body; the cone ends of the inner cone and the outer cone face to the lower side; the inner cone is arranged in the outer cone; the cover body is covered on the outer cone; static vanes are arranged between the upper side of the upper edge of the inner cone and the cover body; the static vanes are longitudinally arranged and arranged in a circle along the upper edge of the inner cone; the insides of the static vanes surrounded in a circle are provided with rotary impellers which are driven by the motor; the axes of the rotary impeller, the inner cone and the outer cone are concurrent; the upper sides of the rotary impellers are provided with discharge openings. In the invention, the accuracy during the separation of grains can be greatly improved by arranging the rotary impellers inside the static vanes; besides, the adjusting performance is good; the grains of the coal powder are uniform; the powder selecting efficiency is greatly improved as well.

The invention relates to a process for preparing carbon forming powder, in particular to a new process for preparing carbon forming powder by adopting an air swept type ball milling system. In the invention, equipment mainly comprises a raw material bin, an air swept type ball mill, a high-efficiency rotor type grader, a gas tank pulse bag type dust collector, a main exhaust fan and a finished powder bin. In the main work process of the invention, a raw material is fed and added to the air swept type ball mill through a feeder and is subjected to rough and fine powder grading through the high-efficiency rotor type grader, rough particles are returned to the ball mill for pulverizing once again, and fine particles enter the gas tank pulse bag type dust collector for collection. The invention has the technological performance advantages of high systemic force supply, low power consumption for unit product, high finished powder purity, and good uniformity and stability, and completely eliminates the phenomena of air leakage and ash flying in the traditional process because of the operation in a negative pressure state. The process is not only suitable for the optimization and technological improvement on the traditional process in the production process of the carbon forming powder, but also suitable for new projects of a carbon forming powder preparation system.

The invention relates to an up feeding and down feeding double-grading type high-efficient powder concentrator, which mainly consists of an upper case, a middle case, a lower case, a transmission support frame, a baiting collection pipe, a grading rotor, a main shaft sleeve, a main shaft, a material spreading disc, a grading blade, a speed reducer, an electric motor and the like, wherein the speed reducer and the electric motor are arranged on the transmission support frame. The invention is characterized in that the upper part of the middle case is connected with the upper case, the center position of the upper case is connected with an air outlet large bent pipe, the top of the upper case is connected with a material inlet pipe, the lower part of the middle case is connected with the lower case, the lower case is provided with a material and gas inlet vertical pipe, and the material and gas inlet vertical pipe is provided with a regulation air valve. The upper case is formed by a plane cross-section hollow cone and a hollow cylinder through up and down butt joint split welding, the middle case is a reverse plane cross-section hollow cone, and the lower case is formed by an inclined cross-section hollow cylinder and an eccentric inclined cylindrical baiting tube body through connection. The invention has the advantages o large material processing capability, good dispersivity, high powder concentration efficiency, low air resistance and the like.

The invention provides an efficient powder selecting machine with a power material scattering device. A lower part power material scattering device (10) is arranged at the lower part of the powder selecting machine; the lower part power material scattering device (10) is composed of a material scattering disc (16), a supporting device (17) connected with the material scattering disc (16), and a second transmission device (18) connected with the supporting device (17). The efficient powder selecting machine has the following technical effects that the power material scattering device is arranged at the lower part so that powder materials to be selected are sufficiently dispersed, and a stable and uniform flow field is provided for rotor grading the next step; the powder selecting efficiency is improved by 10%-15%; feeding is carried out at a lower part: the power selecting concentration of a rotor of the powder selecting machine is greatly reduced and the power consumption of the rotor is reduced by 15%-20%; discharging is carried out at the lower part: large-particle materials and iron blocks are directly discharged from the lower part of a discharging opening, the upper part sealing is not blocked, and the abrasion of an upper guide blade is small.

The invention relates to a cement outer-circulating semi-finish grinding system of a vertical mill. The cement outer-circulating semi-finish grinding system comprises a belt conveyor, a magnetic separator, a metal detector, a three-way valve, the vertical mill, a bucket elevator, a powder concentrator, a dust collector, an air blower, a tube grinder and a chute, wherein the vertical mill is an outer-circulating vertical mill, and no powder concentrator is arranged in the outer-circulating vertical mill; the powder concentrator is formed by connecting a coarse powder V-shaped powder concentrator and a fine powder concentrator in series, and fine powder obtained from the coarse powder V-shaped powder concentrator enters the fine powder concentrator for concentration again; the fine powder obtained from the fine powder concentrator is served as a cement product A and collected through the dust collector and the air blower, and separated coarse powder is divided into two ways, wherein one way enters the tube grinder, and one way returns to the vertical mill for circulating grinding; and the powder which enters the tube grinder is ground into a cement product B by the tube grinder. The cement outer-circulating semi-finish grinding system disclosed by the invention achieves relatively high grinding efficiency by sufficiently exerting the high-efficiency crushing and grinding functions of the vertical mill and the high-efficiency grinding function of the tube grinder on the fine powder, thereby reducing the grinding energy consumption.

The invention relates to a radial efficient powder selecting machine. The radial efficient powder selecting machine comprises a powder selecting machine shell, a finished product outlet formed in theupper part of the powder selecting machine, an intake port and a feed port connected to the powder selecting machine shell, a thick powder collecting cone positioned at the lower end of the powder selecting machine shell, a powder selecting machine rotor mounted in the powder selecting machine shell, movable blades arranged above and below the powder selecting machine rotor, and static blades mounted on the powder selecting machine shell and opposite to the movable blades; the movable blades comprise outer wind fin sections and inner wind fin sections; and the outer wind fin sections and the inner wind fin sections are in arc transition. The invention further provides the radial efficient powder selecting machine and a design method of the powder selecting machine. The technical effects ofthe radial powder selecting machine synthesize CFD theoretical analysis, laboratory tests and industrial application production data, and mainly embody on such aspects as low resistance, high powderselecting efficiency and high selecting clearness.

The invention relates to a powder concentrator integrating the functions of scattering, drying and grading into a whole, which mainly comprises a drying area casing, a scattering area casing, a raw material splitting tube, a splitting device, a volute body, a grading rotor, a main shaft and a main bearing bracket. The powder concentrator is characterized in that the drying area casing is in a V-shaped structure, one side of the drying area casing is joined with the volute body, the upper part of the other side of the drying area casing is connected with the scattering area casing which is slantways arranged, and the upper part of the scattering area casing is connected with the raw material splitting tube in which the splitting device is arranged. An eccentric position in the volute body is vertically provided with the grading rotor which is in a conical structure, and a cantilever of the main shaft of the grading rotor is supported on a bearing pedestal on the main bearing bracket. The invention has the advantages of good material adaptability, strong drying and scattering capabilities, high powder concentration efficiency, low pressure loss of a system, small maintenance quantity of equipment, compact and reasonable structure, large adaptability to materials and the like.

The invention relates to the field of air-swept efficient vertical roller mill. The air-swept efficient vertical roller mill comprises a mill body; a powder selecting mechanism comprising a stator and a rotor is arranged on the upper part of the mill body; the powder selecting mechanism is connected with a discharge port; the side of the mill body is provided with a feeding pipe at the lower part of the powder selecting mechanism; the lower part of the mill body is provided with a discharge pipe corresponding to the powder selecting mechanism; the lower part of the discharge pipe is provided with a roller mechanism corresponding to the feeding pipe; and the roller mechanism is provided with a blowing device, which is a wind ring arranged on the lateral part of the roller mechanism. The wind ring arranged in the present invention enables the materials entering the feeding tube to be blown upward; and then vortex flow is formed through disturbance on the airflow by the rotor; solid particles with large granularity gather into the center of the airflow and fall down continuously; at the same time, the air bumps against an inner wall of the powder selecting mechanism shell and a guide vane to settle down the solid particles with large granularity. Therefore, the present invention has advantages of high powder selecting efficiency, easily adjustable the particle granularity and small granularity range.

The invention discloses a high dispersion type vortex powder selecting machine which comprises a shell, a feeding pipe, a coarse powder collection cone, a motor, a reduction box, a transmission shaft, a material scattering plate, guide fan blades and a cage rotor, and further comprises a cyclone dust collector, a feeding cone, a material dropping pipe, a material passing device, a lower material scattering plate and a cleaning device. The feeding cone is positioned in the shell; a lower opening of the feeding cone is connected with an upper opening of the material dropping pipe; the material passing device is positioned between the cage rotor and the material scattering plate, and is arranged on the inner wall of the shell; a material passing hole is formed in the center part of the material scattering plate; the lower material scattering plate is arranged at the lower end of the transmission shaft; an unloading cone is positioned between the material scattering plate and the lower material scattering plate, and is arranged on the inner wall of the shell; an air inlet pipe is arranged at the lower part of the shell; the cleaning device is positioned above the coarse powder collection cone, and is arranged on the inner wall of the shell; the cyclone dust collector comprises an air inlet, an air outlet and a feed outlet; an air outlet pipe is arranged on the side surface of the upper part of the shell; and the air outlet pipe is connected with the air inlet of the cyclone dust collector.

The invention discloses a roll type vertical mill which comprises mill shell. A grinding disc and grinding rolls are arranged in the mill shell. A nozzle ring is arranged between the outer circumference of the grinding disc and the mill shell. An air inlet is further arranged at the position, on the lower portion of the nozzle ring, of the mill shell. Air enters the air inlet to enter the mill shell to form annular airflow. A material blocking ring is arranged on the edge of the grinding disc and is circumferentially and evenly provided with material stirring plates. Louver air guide blades are annularly and evenly distributed in the nozzle ring. Annularly-distributed impact plates are arranged on the upper portions of the louver air guide blades. A discharging opening used for dischargingis further connected to the bottom of the shell. Annularly-distributed vortex plates are arranged on the inner wall of the middle upper portion of the mill shell, tangential air inlets are arranged at the positions of the mill shell, and air is supplied to the tangential air inlets through an air supplementary annular air flue. According to the roll type vertical mill, the air volume of lifting materials on the nozzle ring can be balanced and adjusted, the material grading efficiency of the nozzle ring can be improved, the air volume of the airflow of the lifting materials can be reduced, thepressure difference can be reduced, energy can be saved, and meanwhile the powder selection efficiency can be improved.

The invention discloses a screening and winnowing machine for sand and stone, which comprises a screening machine, a winnowing bin, a blower, an air inlet channel and an exhaust channel, wherein the screening machine is mounted at the upper part of the winnowing bin; the winnowing bin communicates with the air inlet channel and the exhaust channel; a plurality of collecting hoppers are arranged at the lower part of the winnowing bin; a turning plate is mounted at the lower part of the winnowing bin; in the screening machine, a screening frame does not vibrate; the screening frame of the screening machine is directly and rigidly connected with the winnowing bin; the screening machine adopts a suspended structure; the mounting angle of the screening machine can be adjusted within the range of 35-40 degrees; and side air inlet channels are arranged on the side wall of the winnowing bin. The screening and winnowing machine can carry out screening and powder selection of materials at the same time to obtain products in different particle sizes, improves the screening efficiency and optimizes machine-made sand grading.

The invention discloses a high-dispersibility vortex powder selecting machine. The high-dispersibility vortex powder selecting machine comprises a shell, a cage-shaped rotor, a motor, a speed reduction box, a transmission shaft, a feeding pipe, an air outflow pipe, a scattering plate, air guiding blades and a coarse powder collecting cone and further comprises a medium coarse powder collecting cone, an upper collecting cone, a middle collecting cone, a lower collecting cone, an outer barrel, an air inflow pipe and a powder passing pipe. The medium coarse powder collecting cone is located below the cage-shaped rotor. The lower end of the transmission shaft extends to the inner lower portion of the shell and is installed in a bearing pedestal. The scattering plate is arranged at the lower end of the transmission shaft. The upper collecting cone, the middle collecting cone and the lower collecting cone are sequentially arranged on the inner lower portion of the shell from top to bottom. An upper opening of the outer barrel is connected with the lower end of the powder passing pipe. A lower opening of the outer barrel is connected with an upper opening of the coarse powder collecting cone. The air inflow pipe is located in the outer barrel. A coarse powder channel is reserved between the air inflow pipe and the inner wall of the outer barrel, and a coarse powder channel is reserved between the air inflow pipe and the inner wall of the powder passing pipe. The feeding pipe is arranged on the shell in a penetrating mode. A discharging port of the feeding pipe is located in the shell and above the scattering plate. The air outflow pipe is located on the upper portion of the shell.

The invention discloses a method for treating steel slag tailings subjected to magnetic separation. By the method, steel slag micro-powder of which the specific surface area is more than 400m<2> / kg can be produced in a treatment mode of drying the steel slag tailings, carrying out powder selection and magnetic separation, adding abrasive dust for milling and circulating repeatedly, the recovery rate of iron resources in recovered slag can be improved and the powder milling cost of the steel slag micro-powder can be effectively reduced.

The invention discloses a material dispersing device for a vertical grinder. The material dispersing device comprises a positive cone ring and a negative cone ring which are arranged in an annular space between a grinder shell of the vertical grinder and a grinding barrel of the vertical grinder; and the positive cone ring and the negative cone ring are distributed axially at a certain interval along the grinder shell. Due to the adoption of the material dispersing device for the vertical grinder, the falling time of a ground material ground with a roller mill in the falling process can be prolonged, the material is fully dispersed in the rolling processes of the positive cone ring and the negative cone ring and can be repeatedly impacted, dispersed and separated by rising air flow, the powder selecting efficiency is increased, and the yield of the grinder is remarkably increased. The invention further discloses a material dispersing device for a vertical grinder. The material dispersing device comprises dispersing plates obliquely arranged in an annular space between the grinder shell and the grinding barrel; a plurality of layers of dispersing plates are arranged at intervals along the axial direction of the grinder shell; and each layer of dispersing plates consists of a plurality of dispersing plates which are arranged at intervals along the circumference of the grinder shell.

A double-wheel different composite powder concentrator consists of nested inner and outer shell, the lower part of inner shell is divided into two sections having guide blades to form ventilation fence way, centrifugal wheel in shell, multi-layer rotary disc composed of classifying wheel and material tray. Centrifugal wheel and classifying wheel are driven by different axle. The material classified through inlet, material spraying tray, classifying wheel, centrifugal wheel, finally settled, to obtain the classified powder.

The invention relates to a single driving synchromesh corrugated-surface roller press which is used for smashing material, wherein the driving synchromesh corrugated-surface roller press comprises a main rack; two dentate extruding rollers, which is arranged on the main rack, wherein one of the rollers is a corrugated fixed roller, the other is a corrugated movable roller, the extrusion surfaces of the corrugated fixed roller and the corrugated movable roller are respectively provided with a multiple of mutually matched corrugated fixed roller grinding units and corrugated movable roller grinding units, a material extruding channel is formed between the corrugated fixed roller grinding units and the corrugated movable roller grinding units, and material enters the material extruding channel to perform extruding; a dual-output synchronous reduction gear, which is connected with the two dentate extruding rollers; and a motor, which is connected with the dual-output synchronous reductiongear, wherein the motor controls the two dentate extruding rollers to synchronously rotate by the dual-output synchronous reduction gear. The single driving synchromesh corrugated-surface roller presseffectively avoids abrasion of the roller surface caused by relative sliding due to unequal linear velocity of the roller surfaces of the dentate extruding rollers and reduces the energy consumption,and the powder selecting efficiency is promoted.

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.

The present invention relates to the field of steel tailings micro-powder utilization, particularly to a smelting steel tailings micro-powder production method and an apparatus thereof. The method comprises steps such as material feeding and weighing, and is characterized in that weighed raw materials sequentially form process connections with a magnetic device, a static separator, a dynamic powder selection device, a high pressure roller press and a finished product warehouse, wherein a material outlet of the high pressure roller press is connected with a material feeding port of the magnetic device through a bucket elevator so as to achieve multiple material external circulations, multiple material magnetic separations, and efficient roller pressing crushing. Compared with the method and the apparatus in the prior art, the method and the apparatus of the present invention have the following beneficial effects that: 1) with the magnetic device, it can be effectively ensured that magnetic substances can be separated at the same quality; 2) with the static separator, half finished products are primarily separated, such that powder selection efficiency of the follow-up dynamic powder selection device is increased, and the condition that a specific surface area of the finished product is more than or equal to 450 m<2> / kg is met; 3) the high pressure roller press has characteristics of high operation rate and low power consumption so as to substantially improve steel tailings powdering efficiency; and 4) influence on the high pressure roller press service life by the magnetic substances is reduced.

The invention discloses a cement semi-final powder milling vertical mill. Based on the traditional vertical mill, static blades 1, static blades 2, a rotor and a discharge pipe are separately arranged at the upper part of a vertical mill shell from outside to inside; the static blades 1 and the static blades 2 are separately fixed on an internal shell from outside to inside; the lower parts of the static blades 1 and the static blades 2 are separately connected with a discharge cone 1 and a discharge cone 2; a cone part of the discharge cone 1 is connected with a discharge port; a cone part of the discharge cone 2 is connected with a semi-finished product discharge port; the discharge pipe communicates with the discharge cone 1 after penetrating through the discharge cone 2 to form a mixing cavity; the rotor includes a series of movable blades distributed in the radial direction of the discharge pipe; and a space in the rotor communicates with an air outlet. The invention further discloses a combination system including the vertical mill. According to the combination system, multiple times of separation in the vertical mill can be realized to improve the powder milling efficiency of the vertical mill and the powder separation efficiency of a powder concentrator, and the fineness of semi-finished materials can be controlled to facilitate improvement of the cement quality.

The invention discloses a low-resistance and high-efficient powder concentrator which is a novel low-resistance and high-efficiency powder concentrator that is formed by scientifically combining two classification mechanisms together according to vortex classification and inertia centrifugal classification principles on the basis of comprehensively absorbing a classification principle of a third-generation high-efficient powder concentrator in the world and further carrying out improvement and development. The invention has high powder-concentration efficiency, reliable rotor seal, simple structure, small device size, light weight and flexible arrangement, can improve the yield of a mill by a large margin, does not need large-size castings or machining and is convenient for mounting and maintaining.

The invention discloses an activity excitation type grinding aid used for vertical mill grinding mineral slag, and belongs to the technical field of mineral slag additive. The activity excitation typegrinding aid used for vertical mill grinding mineral slag is composed of a material A and a material B; the material A is composed of, by weight, 15-30 parts of polypropylene-based amine salt, 10-15parts of diisopropylethanolamine, 5-10 parts of triglycol, 3-10 parts of ethylene glycol butyl ether acetate, and 50-75 parts of water; the material B is composed of, by weight, 5 to 8 parts of redispersible latex powder, 10 to 20 parts of ultrafine aluminum silicate, 10 to 20 parts of an activator, and 40 to 70 parts of limestone powder. According to the invention, a plurality of chlorine-free components are adopted, optimization of design composition is adopted so as to obtain the activity excitation type grinding aid used for vertical mill grinding mineral slag; in the activity excitation type grinding aid used for vertical mill grinding mineral slag, the synthetic effect of the components is achieved, so that problems of conventional grinding aid such as poor grinding air effect on vertical mill grinding mineral slag are solved, and at the same time, mineral powder activity is excited effectively.

The invention discloses a novel vertical mill with a lower air inlet function and a built-in combined high-efficiency powder selection function. The novel vertical mill comprises a powder selecting unit and a grinding unit; the powder selecting unit comprises a first-stage powder selecting part and a second-stage powder selecting part, the first-stage powder selecting part includes a central chamber located under the second-stage powder selecting part and edge chambers equidistantly distributed in the circumferential direction of the central chamber at equal intervals, the outer end of each edge chamber is provided with a feeding opening and an air inlet, the upper end of the second-stage powder selecting part is provided with a fine powder discharge port, and the lower end of the second-stage powder selecting part is provided with a coarse powder discharge port; and the grinding unit is fixed to the lower end of the central chamber, and the coarse powder discharge port is downwards inserted into the grinding unit. The novel vertical mill is more compact and reasonable in structure, smaller in occupied space, high in powder selection efficiency and lower in cost, and the novel vertical mill and a mill can be assembled together.

The invention relates to a high-efficiency dynamic and static separator, comprising a body, wherein a separation mechanism composed of a stator and a rotor is arranged in the body; a discharge port is connected to the upper part of the separation mechanism; a charge tube located on the lower part of the separation mechanism is arranged on the side part of the body; and a discharge port arranged corresponding to the separation mechanism is arranged on the lower part of the body. The dynamic and static separator disclosed by the invention forms a vortex airflow mainly by virtue of the disturbance of the rotor on the airflow, large-granularity solid particles are concentrated towards the centre of the airflow and continuously drop, simultaneously, the large-granularity solid particles are settled due to air impact on the inner wall of a separator shell and guide vanes, and the deflection angles of the guide vanes of the separator can be freely adjusted. Therefore, the dynamic and static separator disclosed by the invention has the advantages of being high in separation efficiency, easy in adjustment for the granularities of materials, small in granularity range, high in grading accuracy and the like; and products with various granularity requirements can be produced by using one separator.

The invention discloses a method for preparing a magnetization based surfactant and application. The method comprises the following steps of: (1) isomer combination, namely uniformly combining more than three or less than six of triethanolamine, sodium sulfate, ethylene diamine tetraacetic acid, sulfite yeast distiller wort, calcium dodecy and sodium oxalate; and (2) magnetization, namely magnetizing the isomer by using a permanent magnetic field to obtain the magnetization based surfactant. The method is simple and has convenient operation. The surfactant is used for producing conventional portland cement, portland slag cement, portland fly ash cement, portland-pozzolan cement and composite portland cement to effectively consume industrial waste residue, volcanic ash and other mixed materials, reduce environmental pollution, effectively solve the problems that doping of the mixed materials causes early-strength reduction, hardening slowdown, label reduction and the like of the cement, greatly improve yield and performance of the cement, reduce consumption of energy and resources, and provide powerful technical guarantee for low-carbon cement production.

The invention relates to a powder concentrator. The powder concentrator comprises a cylinder and a bracket, wherein an upper shell is arranged at the top of the cylinder; a lower shell is arranged atthe bottom of the cylinder; the cylinder comprises a fixed shell, a centrifugal cylinder and a material plate; a first driving piece for driving the centrifugal cylinder to rotate is arranged at the external part of the centrifugal cylinder; a feed pipe and a discharge pipe are arranged on the side wall of the upper shell; an intake pipe and a coarse material outlet are arranged on the side wall of the lower shell; a rotating pipe with a closed bottom is vertically and rotationally inserted in the top center of the upper shell; the rotating pipe extends into the lower shell; the rotating pipeis rotationally sleeved with a ventilation pipe out of the upper shell; a second driving device for driving the rotating pipe to rotate is arranged at the top of the upper shell; a scattering device is arranged at the external part of the rotating pipe above the centrifugal cylinder; a first air blowing scattering device is arranged at the external part of the rotating pipe below the centrifugal cylinder and communicating with the rotating pipe; and a second air blowing scattering device is arranged below the first air blowing scattering device and communicating with the rotating pipe. The powder concentrator is simple in structure, improves the powder scattering efficiency, and improves the powder concentration efficiency.

The invention relates to an ultrafine fly ash production technology, which comprises the following steps of: (1) placing a raw material fly ash from a raw material warehouse into an air skewed slot of a grinding head; (2) conveying the raw material by the air skewed slot of the grinding head into a grinding head elevator, and lifting by the grinding head elevator into a bowl mill; (3) grinding the material into a semi-finished product in the bowl mill, and sending the semi-finished product into a grinding tail elevator through an air skewed slot of a grinding tail; (4) entering into a powder choosing machine through the grinding tail elevator, screening, absorbing an iron powder from the raw material by a magnetic separator, conveying a finished product, which accords with the standard and is the finished product with R32 sieve residue being less than 8% and the specific surface area being greater than 700m<2> / kg, into a finished product warehouse, and allowing a substandard semi-finished product to return to the grinding head elevator and enter into the bowl mill so as to repeat the grinding process and repeat the step (3) and the step (4). By the adoption of the ultrafine fly ash production technology, the production efficiency is high, and the finished product satisfies the ultrafine requirements that the R32 sieve residue is less than 8% and the specific surface area is greater than 700m<2> / kg.

The invention discloses a double-layer scattering plate structure of a three-separation powder selecting machine. The double-layer scattering plate structure is high in powder selection efficiency and comprises a main shaft. An upper wheel disc is arranged at the lower end of the main shaft and provided with a plurality of upper-level scattering blades, a lower wheel disc is arranged at the lower end of the upper wheel disc through a connection pipe and is provided with a plurality of lower-level scattering blades, and the upper end of the connection pipe is connected with the upper wheel disc through bolts. The double-layer scattering plate structure has the advantages that intermediate coarse powder can be raised again and enter a powder selection area for powder selection one more time so as to reduce the content of fine powder in the coarse powder, and the powder selection efficiency of the three-separation powder selecting machine can be improved.

The invention discloses a low-resistance and high-efficient powder concentrator which is a novel low-resistance and high-efficiency powder concentrator that is formed by scientifically combining two classification mechanisms together according to vortex classification and inertia centrifugal classification principles on the basis of comprehensively absorbing a classification principle of a third-generation high-efficient powder concentrator in the world and further carrying out improvement and development. The invention has high powder-concentration efficiency, reliable rotor seal, simple structure, small device size, light weight and flexible arrangement, can improve the yield of a mill by a large margin, does not need large-size castings or machining and is convenient for mounting and maintaining.