CN113680462B - Production process of spherical silicon micropowder - Google Patents
Production process of spherical silicon micropowder Download PDFInfo
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- CN113680462B CN113680462B CN202111251306.0A CN202111251306A CN113680462B CN 113680462 B CN113680462 B CN 113680462B CN 202111251306 A CN202111251306 A CN 202111251306A CN 113680462 B CN113680462 B CN 113680462B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
- B07B1/55—Cleaning with fluid jets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
Abstract
The invention relates to the technical field of silicon micropowder production, and particularly provides a production process of spherical silicon micropowder, which comprises S1 and material selection; s2, crushing; s3, grinding into powder; s4, acid washing to remove impurities; s5, flotation; s6, dehydrating; s7, drying, namely conveying the granular materials prepared in the step S6 into a drying cylinder, wherein a crushing device is arranged in the drying cylinder, the granular materials are scattered into powder raw materials through rotation of a transverse pipe and an air outlet pipe on the crushing device, and an air supply device arranged on the drying cylinder provides hot air for the air outlet pipe; s8, calcining, drying the raw material through a drying cylinder in the production process of the spherical silicon micropowder, wherein a crushing device and an air supply device are arranged in the drying cylinder, in the drying process, the wet agglomerated powder raw material is scattered through the crushing device and dried through the air supply device, and airflow blown out by the air supply device firstly flows into an air outlet pipe of the crushing device and then flows into the drying cylinder from the air outlet pipe to dry the powder raw material.
Description
Technical Field
The invention relates to the technical field of silicon micro powder production, in particular to a production process of spherical silicon micro powder.
Background
The spherical silicon micropowder is an amorphous quartz powder material with spherical particle individuals and the main component of silicon dioxide, and has the advantages of small particle size to submicron or nanometer level, uniform particle distribution, no agglomeration and the like. The method is widely applied to the fields of CCL, EMC, electronic glue, plastics, films, polishing, special ceramics, ink paint, cosmetics and the like. The spherical silicon micro powder is used as a filling material, so that the rigidity, the wear resistance, the weather resistance, the impact resistance, the pressure resistance, the tensile resistance, the flame resistance, the arc insulation resistance and the ultraviolet radiation resistance of electronic products can be greatly improved.
The preparation method of the spherical silicon micro powder mainly comprises a gas combustion flame method: firstly, high-purity quartz sand is subjected to pretreatment such as crushing, screening, purification and drying, then quartz micropowder is sent into a high-temperature field generated by fuel gas-oxygen for high-temperature melting and cooling to form spherical high-purity silicon micropowder, and finally high-purity spherical silicon micropowder is formed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problem that raw materials are easy to agglomerate in the production process of spherical silicon powder, the invention provides a production process of spherical silicon powder to solve the problem.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production process of spherical silicon micropowder comprises the following steps:
s1, selecting materials, selecting quartz minerals, cleaning and primarily removing impurities;
s2, crushing, namely crushing the cleaned quartz mineral by a crusher to prepare a sand-shaped material;
s3, grinding, namely grinding the sandy materials into powder by adopting a horizontal ball mill;
s4, removing impurities by pickling, conveying powder into a pickling tank through a powder pipeline, conveying a pickling solution into the pickling tank through a water inlet pipe, stirring and mixing through a stirring rod arranged in the pickling tank, then introducing clean water, discharging wastewater in the pickling tank through a wastewater pipe in an overflow mode, continuously adding clean water into the pickling tank through the water inlet pipe, stirring and cleaning, and discharging the wastewater generated by cleaning from the wastewater pipe;
s5, performing flotation, namely adding a flotation agent and clear water into the pickling tank, stirring, standing and precipitating after stirring is completed, forming upper-layer impurities and lower-layer slurry after the impurities are completely reacted and float upwards, overflowing the upper-layer impurities out of the pickling tank through the waste water pipe, and discharging the lower-layer slurry out of the pickling tank through the discharge pipe;
s6, dewatering, namely conveying the slurry in the S5 to a centrifugal dehydrator for dewatering to form granules;
s7, drying, conveying the granules prepared in S6 into a drying cylinder through a feeding pipeline, arranging a crushing device in the drying cylinder, scattering the granules into powder raw materials through rotation of a transverse pipe and an air outlet pipe on the crushing device, arranging an air inlet and an air outlet on the air outlet pipe, abutting the air outlet with a filter plate arranged at the bottom of the drying cylinder, supplying hot air to the air outlet pipe through an air supply device arranged on the drying cylinder in the moving process of the air outlet pipe, drying the powder when air is blown into the drying cylinder from the air inlet, preventing the powder from being wet and blocking again, impacting the filter plate when air is blown into the drying cylinder from the air outlet, enabling the powder to rapidly pass through the filter plate, simultaneously lifting the granules accumulated on the filter plate, preventing the granules from blocking the filter plate, and scattering the lifted granules into powder raw materials through the transverse pipe again, the powder raw materials are sieved by the filter plate at the bottom of the drying cylinder and then fall into a collecting cylinder;
and S8, calcining the powder raw material prepared in the S7 to obtain the spherical silicon micro powder.
Preferably, in S7, the crushing device further includes a motor, a main shaft and a vertical pipe, the motor is fixed to the bottom of the drying cylinder, the main shaft penetrates through the filter plate, an output shaft of the motor is connected to the main shaft through a coupler, the vertical pipe is fixed to the main shaft, two ends of the vertical pipe are respectively communicated with the horizontal pipe and the air outlet pipe, the motor drives the main shaft to rotate, and the main shaft rotates to enable the horizontal pipe and the air outlet pipe to rotate.
Preferably, in S7, still be provided with the regulating plate in the air-out pipe, the regulating plate is located the below in air-out pipe, still be provided with three guide post perpendicularly on the regulating plate, it is three the guide post is followed the length direction of regulating plate evenly lays, the guide post runs through the upper surface of air-out pipe and with air-out pipe sliding connection, the regulating plate can move towards the air-out mouth slides, works as when the jam takes place for the filter plate, the regulating plate upwards moves under the atmospheric pressure effect and blocks up the air-out mouth, makes the hot-air that air supply arrangement provided is whole to be followed the wind gap blows off down, promotes right the clearance effect of filter plate, also can continue simultaneously to dry the powder in the stoving section of thick bamboo.
Preferably, in S7, the maximum value of the sum of the areas of the meshes of the filter sheet located directly below the air outlet pipe is smaller than the sum of the air outlet areas of the air inlets.
Preferably, in S7, the air supply device includes an air inlet pipe, a filter cartridge, a cartridge cover, an annular air box, and an annular baffle, the annular air box is fixed to a cartridge wall of the drying cartridge, the annular baffle is slidably mounted on the annular air box and located inside the drying cartridge, the annular baffle and the annular air box are coaxial and can rotate around an axis thereof, an annular channel is formed between the annular baffle and the annular air box, the horizontal pipe is mounted on the annular baffle and is communicated with the annular channel, the cartridge cover is covered outside the filter cartridge and is communicated with the air inlet pipe, and the filter cartridge is fixed to the annular air box and is communicated with the annular channel.
Preferably, in S4, a stirring motor is disposed on the top of the pickling tank, an output shaft of the stirring motor is connected to the stirring rod, and the powder pipeline and the water inlet pipe are disposed on the top of the pickling tank.
Preferably, in S5, the wastewater pipe is disposed at a position near the top of the pickling tank, and the discharge pipe is disposed at the bottom of the pickling tank.
Preferably, in S6, the centrifugal dehydrator includes a feed port, a drain port, and a discharge port, the discharge port is communicated with the drying drum, the discharge pipe is connected to the feed port, and the discharge pipe is provided with a transfer pump.
The drying device has the advantages that the raw materials are dried through the drying cylinder in the spherical silicon micro powder production process, the crushing device and the air supply device are arranged in the drying cylinder, in the drying process, wet and caked powder raw materials are scattered through the crushing device and dried through the air supply device, airflow blown out by the air supply device firstly flows into the air outlet pipe of the crushing device and then flows into the drying cylinder from the air outlet pipe, the filter plate is arranged at the bottom of the drying cylinder to screen the powder raw materials, when the filter plate is blocked, the filter plate is cleaned through the airflow provided by the air supply device, the blockage of the filter plate is avoided, and simultaneously, caked raw materials accumulated on the filter plate are lifted and hit again, so that caked raw materials are dispersed, and the drying effect of the powder raw materials is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flow chart of a process for producing spherical fine silica powder according to the present invention;
FIG. 2 is a schematic structural diagram of a process for producing spherical fine silica powder according to the present invention;
FIG. 3 is a schematic structural view of a pulverizing apparatus in the production process of spherical fine silica powder according to the present invention;
FIG. 4 is an exploded view of a pulverizing apparatus of a process for producing spherical fine silica powder according to the present invention;
FIG. 5 is a schematic structural view of a filter cartridge of a process for producing spherical fine silica powder according to the present invention;
FIG. 6 is a sectional view of a filter cartridge of a process for producing spherical fine silica powder according to the present invention;
FIG. 7 is a sectional view of an air outlet pipe of the process for producing spherical fine silica powder according to the present invention;
FIG. 8 is a schematic view of a first viewing angle structure of an air outlet pipe of the process for producing spherical fine silica powder according to the present invention;
fig. 9 is a second view angle structure diagram of the air outlet pipe of the production process of spherical silica micropowder of the invention.
In the figure, 1, a pickling tank, 2, a water inlet pipe, 3, a powder pipeline, 4, a stirring motor, 5, a waste water pipe, 6, a discharge pipe, 7, a centrifugal dehydrator, 8, a feed inlet, 9, a water outlet, 10, a discharge outlet, 11, a drying cylinder, 12, a conveying pump, 13, a feed pipeline, 14, a transverse pipe, 15, an air outlet pipe, 16, a main shaft, 17, a vertical pipe, 18, a filter plate, 19, an upper air inlet, 20, a lower air inlet, 21, a regulating plate, 22, a guide column, 23, an air inlet pipe, 24, a filter cylinder, 25, a cylinder cover, 26, an annular air box, 27, an annular baffle, 28 and a collecting cylinder are adopted.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 to 9, the present invention provides an embodiment of a production process of spherical fine silica powder, including the following steps:
s1, selecting materials, selecting quartz minerals, cleaning and primarily removing impurities;
s2, crushing, namely crushing the cleaned quartz mineral by a crusher to prepare a sand-shaped material;
s3, grinding, namely grinding the sandy materials into powder by adopting a horizontal ball mill, so that the materials are convenient to transport and process;
s4, removing impurities by pickling, conveying powder into a pickling tank 1 through a powder pipeline 3, conveying a pickling solution into the pickling tank 1 through a water inlet pipe 2, arranging the powder pipeline 3 and the water inlet pipe 2 at the top of the pickling tank 1, arranging a stirring motor 4 at the top of the pickling tank 1, connecting an output shaft of the stirring motor 4 with a stirring rod, driving the stirring rod to rotate by the rotation of the stirring motor 4, stirring and mixing the materials in the pickling tank 1, then introducing clean water, discharging wastewater in the pickling tank 1 through a wastewater pipe 5 in an overflow mode, continuously adding clean water into the pickling tank 1 through the water inlet pipe 2, stirring and cleaning, and discharging the wastewater generated by cleaning from the wastewater pipe 5;
s5, flotation, adding a flotation agent and clear water into the pickling tank 1 and stirring, standing and precipitating after stirring, forming upper-layer impurities and lower-layer slurry after the impurities completely react and float, overflowing the upper-layer impurities out of the pickling tank 1 through a waste water pipe 5, adding clear water required in the overflowing process into the pickling tank 1 through a water inlet pipe 2, discharging the lower-layer slurry out of the pickling tank 1 through a discharging pipe 6, arranging the waste water pipe 5 at a position, close to the top, of the pickling tank 1, and facilitating overflow operation, arranging the discharging pipe 6 at the bottom of the pickling tank 1, and facilitating discharging the slurry out of the pickling tank 1;
s6, dehydrating, namely conveying the slurry in the S5 to a centrifugal dehydrator 7 for dehydrating to form particles, so as to realize dry-wet separation and facilitate subsequent transportation and processing of the materials, wherein the centrifugal dehydrator 7 is provided with a feed inlet 8, a water outlet 9 and a discharge outlet 10, the discharge outlet 10 is communicated with a drying cylinder 11, so that the dehydrated particles can directly enter the drying cylinder 11 for drying operation, a discharge pipe 6 is connected with the feed inlet 8, the discharge pipe 6 is provided with a conveying pump 12, the slurry prepared in the pickling tank 1 is conveyed into the centrifugal dehydrator 7 for dehydrating through the conveying pump 12, the centrifugal dehydrator 7 adopts a horizontal centrifugal dehydrator, the structure of the centrifugal dehydrator is provided with a spiral conveying mechanism, and the materials can be continuously conveyed to the discharge outlet;
s7, drying, conveying the granules prepared in the step S6 into a drying cylinder 11 through a feeding pipeline 13, wherein a crushing device is arranged in the drying cylinder 11, the particle materials are broken up into powder raw materials through the rotation of a transverse pipe 14 and an air outlet pipe 15 on the crushing device, the crushing device also comprises a motor, a main shaft 16 and a vertical pipe 17, the motor is fixed at the bottom of the drying cylinder 11, the main shaft 16 penetrates through a filter plate 18, the output shaft of the motor is connected with the main shaft 16 through a coupling, the vertical pipe 17 is fixed on the main shaft 16, the two ends of the vertical pipe 17 are respectively communicated with the transverse pipe 14 and the air outlet pipe 15, the motor drives the main shaft 16 to rotate, the main shaft 16 rotates to enable the transverse pipe 14 and the air outlet pipe 15 to rotate, an upper air inlet 19 and a lower air inlet 20 are formed in the air outlet pipe 15, the lower air inlet 20 is abutted to a filter plate 18 arranged at the bottom of the drying cylinder 11, and the maximum value of the sum of the areas of meshes on the filter plate 18 located right below the air outlet pipe 15 is smaller than the sum of the air outlet areas of the upper air inlet 19;
in the moving process of the air outlet pipe 15, hot air is provided for the air outlet pipe 15 through an air supply device arranged on the drying cylinder 11, materials in the drying cylinder 11 are dried, an adjusting plate 21 is further arranged in the air outlet pipe 15, the adjusting plate 21 is positioned below an upper air inlet 19, three guide columns 22 are further vertically arranged on the adjusting plate 21, the three guide columns 22 are uniformly distributed along the length direction of the adjusting plate 21, the guide columns 22 penetrate through the upper surface of the air outlet pipe 15 and are in sliding connection with the air outlet pipe 15, the adjusting plate 21 can slide towards the upper air inlet 19, when the filter plate 18 is not blocked, air flow in the vertical pipe 17 flows in a transition section of the air inlet pipe 15 and the air outlet pipe 15 and is divided into two air flows with the same air volume by the adjusting plate 21, one air flow is blown out from the upper air inlet 19 to dry particles and powder in the drying cylinder 11, the other air flow is blown out from a lower air inlet 20 to enable the powder to rapidly pass through the filter plate 18, when the filter plate 18 is not blocked, the maximum value of the sum of the areas of the meshes on the filter plate 18 right below the air outlet pipe 15 is smaller than the sum of the air outlet areas of the upper air inlet 19, namely the actual air outlet area of the lower air inlet 20 is smaller than the actual air outlet area of the upper air inlet 19, under the condition that the air quantity is unchanged, the air flow rate and the air outlet area are in inverse proportion, namely the air flow rate at the upper air inlet 19 is smaller than the air flow rate at the lower air inlet 20, so that the pressure above the adjusting plate 21 is greater than the pressure below the adjusting plate 21, the adjusting plate 21 cannot deviate from the upper air inlet 19, and meanwhile, the air outlet area of the upper air inlet 19 is not too large, so that the air flow is ensured to have higher flow rate when flowing out from the upper air inlet 19, and the drying effect on the powder is improved; when the mesh on the filter plate 18 right below the air outlet pipe 15 is partially blocked, the actual air outlet area of the lower air inlet 20 is reduced due to the fact that the lower air inlet 20 is abutted to the filter plate 18, under the condition that the air volume is not changed, the air flow rate at the lower air inlet 20 is accelerated, the air speed flowing to the filter plate 18 is increased, the cleaning effect on the filter plate 18 is improved, at the moment, downward supporting force generated by air pressure difference above the adjusting plate 21 is balanced with the pulling force provided by the guide columns 22, and the adjusting plate 21 is prevented from falling to block the lower air inlet 20; when the mesh on the filter plate 18 directly under the air outlet pipe 15 is completely blocked, and under the condition that the air volume is not changed, the air flow in the vertical pipe 17 just enters the air outlet pipe 15, can only be blown out from the upper air inlet 19, and can not be blown out from the lower air inlet 20, so that the air flow rate of the upper air inlet 19 is greatly increased, the air pressure above the adjusting plate 21 is reduced, the air flow rate below the adjusting plate 21 is relatively small, at the moment, the upward supporting force generated by the air pressure difference is greater than the self gravity of the adjusting plate 21, so that the adjusting plate 21 is pushed upwards, the upper air inlet 19 is blocked by the adjusting plate 21, the adjusting plate 21 is made of a light and thin metal material, the adjusting plate 21 can rapidly move upwards, after the upper air inlet 19 is blocked, the air in the vertical pipe 17 continuously flows into the air outlet pipe 15, so that the air pressure in the air outlet pipe 15 is increased, the air can only be discharged by breaking the blocked filter holes, at the lower air inlet 20 of the air outlet pipe 15, the pressure applied to the filter plate 18 is increased, therefore, the blocked part of the blocked filter plate 18 is flushed away, the filter plate 18 is prevented from being blocked, when gas flows out from the lower air inlet 20, the particles accumulated on the filter plate 18 are lifted, the particles are prevented from blocking the filter plate 18, the lifted particles are scattered into powder raw materials through the transverse pipe 14 again, and meanwhile, the gas blown out from the lower air inlet 20 can also enter the drying cylinder 11 to dry the materials in the drying cylinder 11;
the air supply device comprises an air inlet pipe 23, a filter cartridge 24, a cartridge cover 25, an annular air box 26 and an annular baffle 27, wherein the annular air box 26 is fixed on the wall of the drying cartridge 11, the annular baffle 27 is slidably mounted on the annular air box 26 and is positioned in the drying cartridge 11, the annular baffle 27 and the annular air box 26 are coaxial and can rotate by taking the axis as a rotation center, an annular channel is formed between the annular baffle 27 and the annular air box 26, a transverse pipe 14 is mounted on the annular baffle 27, the transverse pipe 14 is communicated with the annular channel, the cartridge cover 25 is covered outside the filter cartridge 24, the cartridge cover 25 is communicated with the air inlet pipe 23, the filter cartridge 24 is fixed on the annular air box 26 and is communicated with the annular channel, the annular baffle 27 can be driven to rotate together when the transverse pipe 14 rotates, in the rotation process of the transverse pipe 14, air can continuously and sequentially flow into the cartridge cover 25, the filter cartridge 24 and the annular channel from the annular channel into the air inlet pipe 14, and then flows into the annular channel 14, The vertical pipe 17 and the air outlet pipe 15 finally flow out from the upper air inlet 19 and the lower air inlet 20, the arrangement of the annular channel enables the horizontal pipe 14 and the air outlet pipe 15 to continuously introduce air for drying in the rotating process, meanwhile, the air outlet pipe 15 continuously exhausts air in the rotating process to enable high-temperature air to be uniformly distributed in the inner space of the whole drying cylinder 11, so that the temperature of each part in the drying cylinder 11 is relatively balanced, the drying effect on powder is improved, the powder is prevented from being wetted and agglomerated again, and the powder raw material falls into the collecting cylinder 28 after being screened by the filter plate 18 at the bottom of the drying cylinder 11;
and S8, calcining, namely feeding the powder raw material prepared in the S7 into a high-temperature furnace for calcining to obtain the spherical silicon micro powder.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. The production process of the spherical silicon micropowder is characterized by comprising the following steps:
s1, selecting materials, selecting quartz minerals, cleaning and primarily removing impurities;
s2, crushing, namely crushing the cleaned quartz mineral by a crusher to prepare a sand-shaped material;
s3, grinding, namely grinding the sandy materials into powder by adopting a horizontal ball mill;
s4, removing impurities by pickling, conveying powder into a pickling tank through a powder pipeline, conveying a pickling solution into the pickling tank through a water inlet pipe, stirring and mixing through a stirring rod arranged in the pickling tank, then introducing clean water, discharging wastewater in the pickling tank through a wastewater pipe in an overflow mode, continuously adding clean water into the pickling tank through the water inlet pipe, stirring and cleaning, and discharging the wastewater generated by cleaning from the wastewater pipe;
s5, performing flotation, namely adding a flotation agent and clear water into the pickling tank, stirring, standing and precipitating after stirring is completed, forming upper-layer impurities and lower-layer slurry after the impurities are completely reacted and float upwards, overflowing the upper-layer impurities out of the pickling tank through the waste water pipe, and discharging the lower-layer slurry out of the pickling tank through the discharge pipe;
s6, dewatering, namely conveying the slurry in the S5 to a centrifugal dehydrator for dewatering to form granules;
s7, drying, conveying the granules prepared in S6 into a drying cylinder through a feeding pipeline, arranging a crushing device in the drying cylinder, scattering the granules into powder raw materials through rotation of a transverse pipe and an air outlet pipe on the crushing device, arranging an air inlet and an air outlet on the air outlet pipe, abutting the air outlet with a filter plate arranged at the bottom of the drying cylinder, supplying hot air to the air outlet pipe through an air supply device arranged on the drying cylinder in the moving process of the air outlet pipe, drying the powder when air is blown into the drying cylinder from the air inlet, preventing the powder from being wet and blocking again, impacting the filter plate when air is blown into the drying cylinder from the air outlet, enabling the powder to rapidly pass through the filter plate, simultaneously lifting the granules accumulated on the filter plate, preventing the granules from blocking the filter plate, and scattering the lifted granules into powder raw materials through the transverse pipe again, the powder raw materials are sieved by the filter plate at the bottom of the drying cylinder and then fall into a collecting cylinder;
and S8, calcining the powder raw material prepared in the S7 to obtain the spherical silicon micro powder.
2. The production process of spherical silica micropowder according to claim 1, characterized by: in S7, the smashing device further comprises a motor, a main shaft and a vertical pipe, wherein the motor is fixed to the bottom of the drying cylinder, the main shaft penetrates through the filter plate, an output shaft of the motor is connected with the main shaft through a coupler, the vertical pipe is fixed to the main shaft, two ends of the vertical pipe are respectively communicated with the transverse pipe and the air outlet pipe, the motor drives the main shaft to rotate, and the main shaft rotates to enable the transverse pipe and the air outlet pipe to rotate.
3. The production process of spherical silica micropowder as claimed in claim 2, characterized in that: in S7, still be provided with the regulating plate in the air-out pipe, the regulating plate is located the below in air-out mouth, still be provided with three guide post perpendicularly on the regulating plate, it is three the guide post is followed the length direction of regulating plate evenly lays, the guide post runs through the upper surface of air-out pipe and with air-out pipe sliding connection, the regulating plate can move towards the air-out mouth slides, works as when the filter plate takes place to block up, the regulating plate upwards removes under the atmospheric pressure effect and blocks up the air-out mouth makes the hot-air that air supply arrangement provided is whole to be followed the air-out mouth blows out down, and it is right to promote the clearance effect of filter plate, also can continue simultaneously right powder in the section of thick bamboo of drying is dried.
4. A process for producing spherical fine silica powder according to claim 3, wherein: in S7, the maximum value of the sum of the areas of the meshes on the filter plate located directly below the air outlet pipe is smaller than the sum of the air outlet areas of the air inlets.
5. The production process of spherical silica micropowder according to claim 4, characterized by: in S7, the air supply device comprises an air inlet pipe, a filter cartridge, a cartridge cover, an annular air box and an annular baffle, wherein the annular air box is fixed on the cartridge wall of the drying cartridge, the annular baffle is slidably mounted on the annular air box and located in the drying cartridge, the annular baffle and the annular air box are coaxial and can rotate by taking the axis of the annular air box as a rotation center, an annular channel is formed between the annular baffle and the annular air box, the transverse pipe is mounted on the annular baffle, the transverse pipe is communicated with the annular channel, the cartridge cover is covered outside the filter cartridge, the cartridge cover is communicated with the air inlet pipe, and the filter cartridge is fixed on the annular air box and is communicated with the annular channel.
6. A process for producing spherical fine silica powder according to claim 5, wherein: in S4, the top of the pickling tank is provided with a stirring motor, an output shaft of the stirring motor is connected with the stirring rod, and the powder pipeline and the water inlet pipe are arranged at the top of the pickling tank.
7. The production process of spherical silica micropowder according to claim 6, characterized by: in S5, the wastewater pipe is disposed near a top of the pickling tank, and the discharge pipe is disposed at a bottom of the pickling tank.
8. The production process of spherical fine silica powder according to claim 7, wherein: in S6, centrifugal dehydrator is last to have feed inlet, outlet and bin outlet, the bin outlet intercommunication the section of thick bamboo of drying, the discharging pipe with the feed inlet is connected, be provided with the delivery pump on the discharging pipe.
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