CN114505152A - Superfine production process of alpha-alumina micropowder - Google Patents
Superfine production process of alpha-alumina micropowder Download PDFInfo
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- CN114505152A CN114505152A CN202210056166.XA CN202210056166A CN114505152A CN 114505152 A CN114505152 A CN 114505152A CN 202210056166 A CN202210056166 A CN 202210056166A CN 114505152 A CN114505152 A CN 114505152A
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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
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
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Abstract
The invention discloses an alpha-alumina micropowder ultra-fining production process, aiming at solving the technical problem that the technology can not ensure the accuracy of ultra-fine powder. The method mainly comprises the following three steps: firstly, putting an alpha-alumina raw material into a crusher for crushing to obtain alpha-alumina particles with the diameter of 25-35 mm; secondly, putting the material obtained in the first step into a ball mill with a sieve for crushing, filtering, screening and grading the crushed material through a filter screen, feeding the material with the particle size of 0-5 micrometers into the subsequent step, and returning the material with the particle size of more than 5 millimeters to the ball mill with the sieve for crushing again; and thirdly, putting the materials obtained in the second step into a continuous ball mill for crushing, inspecting and classifying the crushed materials through a classifier, conveying the materials with the particle size of 0.5-0.8 micron to a bagging machine for bagging, and returning the materials with the diameter of more than 0.8 micron to the continuous ball mill for crushing again. The invention improves the precision of the alpha-alumina superfine powder through the design of inspection and classification.
Description
Technical Field
The invention relates to the technical field of alpha-alumina production, in particular to an alpha-alumina micropowder ultra-fine production process.
Background
The crystal form is alpha-type alumina, namely alpha-alumina, the alpha-alumina (commonly called corundum) is the most stable phase in all the alumina, has uniform particle size distribution, high purity, high dispersion and low specific surface, has high temperature resistance and inertia, does not belong to active alumina, and almost has no catalytic activity; the nano alumina has strong heat resistance, good formability, stable crystalline phase, high hardness and good dimensional stability, so the nano alumina is widely applied to reinforcement and toughening of various products such as plastics, rubber, ceramics, refractory materials and the like, and particularly has remarkable improvement on compactness, smoothness, cold and hot fatigue property, fracture toughness, creep resistance and wear resistance of high polymer material products. Because the alpha-alumina is also a far infrared emission material with excellent performance, the alpha-alumina is used as a far infrared emission and heat insulation material to be applied to chemical fiber products and high-pressure sodium lamps. In addition, the alpha-alumina has high resistivity and good insulating property, and can be applied to main accessories of YGA laser crystal and integrated circuit substrates.
The ultrafine powder alpha-alumina has excellent physical properties and is widely applied to various technical fields; the alpha-alumina powder is generally prepared by grinding alpha-alumina raw materials, but the existing grinding production process and equipment thereof can not ensure that the alpha-alumina powder product can reach the required fineness and reasonable particle gradation, have low production efficiency and high energy consumption, and can generate a large amount of dust in the production process to pollute the environment.
Disclosure of Invention
The invention aims to provide an alpha-alumina micropowder ultra-refining production process, which aims to solve the technical problem that the existing grinding production process is difficult to ensure that the alpha-alumina micropowder reaches sufficient fineness and reasonable gradation.
In order to solve the technical problems, the invention adopts the following technical scheme:
an alpha-alumina micropowder ultra-fining production process is designed, which mainly comprises the following steps:
(1) feeding the alpha-alumina raw material into a crusher for coarse crushing to obtain a material with the diameter of 25-35 mm;
(2) putting the material obtained in the step (1) into a ball mill with a sieve for crushing, filtering, screening and grading the crushed material through a filter screen, feeding the material with the particle size of 0-5 microns into the subsequent step, and returning the material with the particle size of more than 5 millimeters to the ball mill with the sieve for crushing again;
(3) and (3) feeding the alpha-alumina powder obtained in the step (2) into a continuous mill for crushing, inspecting and classifying the crushed material through a classifier, conveying the material with the particle size of 0.5-0.8 micrometer to a bagging machine for bagging, and feeding the material with the diameter of more than 0.8 micrometer back to the continuous ball mill for secondary crushing.
Preferably, in the step (1), the α -alumina raw material is a high-temperature α -alumina lump material fired at 1400 to 1500 ℃.
Preferably, the crusher is a jaw crusher.
Preferably, in the step (3), the diameter of the continuous ball mill is 1.5-2 m, and the length is 7-8 m.
Preferably, the submicron powder continuous production line includes jaw crusher, area sieve ball mill, continuous ball mill and the chartered plane that connects gradually, jaw crusher with be provided with first storage silo between the area sieve ball mill, be provided with the second storage silo between area sieve ball mill and the continuous ball mill, be provided with the third storage silo between continuous ball mill and the chartered plane.
Preferably, the materials crushed by the jaw crusher enter the first storage bin through a first plate chain type elevator, and the materials in the first storage bin enter the ball mill with the screen through a vibrating feeder.
Preferably, the ball mill with the sieve can crush materials to 0-5 microns, a 5-micron vibrating screen for classification is additionally arranged between the ball mill with the sieve and the second plate-chain type elevator, the materials with the diameter larger than 5 microns return to the ball mill with the sieve through a conveying pipeline, and the materials with the diameter smaller than 5 microns enter the second plate-chain type elevator.
Preferably, a 0-0.8 micron classifier is additionally arranged between the continuous ball mill and the third storage bin, qualified materials enter the third storage bin through the first spiral conveyor, and unqualified materials return to the continuous ball mill through the conveying pipeline.
Preferably, a wind catcher and a dust collecting bin connected with the wind catcher are arranged between the classifier and the first screw conveyor, so that qualified materials can be collected conveniently.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the alpha-alumina superfine powder is prepared by coarsely crushing the alpha-alumina raw material by using a crusher, further crushing the coarsely crushed material by using a ball mill with a sieve, and finally completely crushing by using a continuous ball mill, wherein the diameter of the alpha-alumina superfine powder can reach the nanometer level, so that the superfine production of the alpha-alumina superfine powder is realized.
2. The invention improves the fineness of the alpha-alumina superfine powder by screening and grading the materials crushed by the ball mill with the screen and the continuous ball mill.
3. The invention is based on the organic integration and arrangement of various devices, and the procedures are in seamless butt joint, thereby realizing continuous high-efficiency production and saving energy consumption.
Drawings
FIG. 1 is a process flow diagram of one embodiment of the present invention.
FIG. 2 is a schematic view of the structure of the production line of the present invention.
FIG. 3 is a schematic view of the structure of a second ball mill in the production line of the present invention.
In the figures, 1 is a jaw crusher, 2 is a first plate chain type elevator, 3 is a first storage bin, 4 is a vibrating feeder, 5 is a ball mill with a screen, 6 is a vibrating screen, 7 is a second plate chain type elevator, 8 is a second storage bin, 89 is a screw feeder, 9 is a continuous ball mill, 10 is a grader, 11 is a third storage bin, and 12 is a bagging machine.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
Reference herein to "first," "second," etc., is used to distinguish between similar items and not to limit the particular order or sequence.
The components and parts of the units and structures in the following examples are all conventional and commercially available products unless otherwise specified.
Example 1: an alpha-alumina micropowder ultra-fining production process, referring to figure 1, comprises the following steps:
(1) firing the alpha-alumina to obtain blocky alpha-alumina with the temperature of 1400-1500 ℃, putting the high-temperature blocky alpha-alumina into a jaw crusher to crush to obtain alpha-alumina particles with the diameter of 25-35 mm;
(2) putting the material obtained in the step (1) into a first ball mill for crushing to obtain 0-5 micron alpha-alumina powder; and (4) the first ball mill is a ball mill with a sieve, the materials crushed by the ball mill with the sieve are filtered, inspected and classified through a filter screen, the materials with the diameter of 0-5 micrometers can be subjected to the step (3), and the materials with the diameter of more than 5 millimeters are sent back to the ball mill with the sieve for secondary crushing.
(3) Putting the material obtained in the step (2) into a second ball mill for crushing to obtain alpha-alumina superfine powder of 0.5-0.8 micron; the second ball mill is a continuous ball mill, the diameter of the continuous ball mill is 1.8 meters, the length of the continuous ball mill is 7.5 meters, the materials crushed by the continuous ball mill are inspected and classified by a classifier, the materials with the diameter of 0.5-0.8 micrometers are conveyed to a bagging machine for bagging, and the materials with the diameter larger than 0.8 micrometers are conveyed back to the continuous ball mill for secondary crushing.
The alpha-alumina micropowder superfine production line mainly comprises a jaw crusher 1, a ball mill 5 with a sieve, a continuous ball mill 9 and a bagging machine 12 which are connected in sequence, wherein a first storage bin 3 is arranged between the jaw crusher 1 and the ball mill 5 with the sieve, a second storage bin 8 is arranged between the ball mill 5 with the sieve and the continuous ball mill 9, a third storage bin 11 is arranged between the continuous ball mill 9 and the bagging machine 12, the jaw crusher 1 has a simple structure, a large crushing ratio, a good crushing effect and uniform crushing, materials crushed by the jaw crusher 1 enter the first storage bin 3 through a first plate chain type elevator 2, the capacity of the first storage bin 3 is 100t, the materials in the first storage bin 3 enter the first ball mill 5 through a vibration feeder 4, and the vibration feeder 4 provides a power source through a vibration motor, for the inclined conveyor belt type feeding machine, a vibrating motor is arranged at the lower side of a conveyor belt, the vibration of the conveyor belt is driven by the vibration of the motor, so that materials are conveyed to the ball mill with a sieve 5 through the inclined conveyor belt, the ball mill with the sieve 5 can crush the materials to 0-5mm, the materials crushed by the ball mill with the sieve 5 enter the second storage bin 8 through a second plate chain type lifting machine 7, a 5mm vibrating screen 6 for classification is additionally arranged between the ball mill with the sieve 5 and the second plate chain type lifting machine 7, the materials with the diameter larger than 5mm return to the ball mill with the sieve 5 through a conveying pipeline, the materials with the diameter smaller than 5mm enter the second plate chain type lifting machine 7, and the accuracy of material crushing and the uniformity of needed superfine powder materials are improved through the arrangement of the vibrating screen 6; the materials in the second storage bin 8 enter the continuous ball mill 9 through a screw feeder, the diameter and the length of the continuous ball mill 9 are respectively 1.8m and 7.5m, a 0-0.8 micron classifier 10 is additionally arranged between the continuous ball mill 9 and the third storage bin 11, qualified materials enter the third storage bin 11 through the first screw conveyor, unqualified materials return to the continuous ball mill 9 through a conveying pipeline, further, the crushed materials are classified through the classifier 10, and the materials which do not reach the superfine powder are conveyed back to the continuous ball mill 9 again for re-crushing, so that the crushing precision is improved; grader 10 with be provided with between the first screw conveyer wind-force trapper and with the dust collecting bin that the wind-force trapper is connected to do benefit to and collect qualified material, utilize the wind-force trapper is collected the submicron powder material, can improve collection efficiency and collection effect, just first screw conveyer with add between the third storage silo 11 and be equipped with the 500kg storage tank that plays the buffer memory effect, the storage tank is connected with the fan, be used for with the material of storage tank is carried extremely third storage silo 11, works as when material in the storage tank spills over, then passes through the fan will the material is carried extremely third storage silo 11, material in the third storage silo 11 is delivered to via the second screw conveyer bagging machine 12 carries out the bagging-off.
While the invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes in the form and details may be made therein without departing from the spirit and scope of the invention, and equivalents of the related apparatus and method steps may be substituted to form more specific embodiments than are presently considered to be within the scope of the invention.
Claims (9)
1. An alpha-alumina micropowder ultra-fining production process is implemented based on an ultra-micropowder continuous production line, and comprises the following steps:
(1) feeding the alpha-alumina raw material into a crusher for coarse crushing to obtain a material with the diameter of 25-35 mm;
(2) putting the material obtained in the step (1) into a ball mill with a sieve for crushing, filtering, screening and grading the crushed material through a filter screen, feeding the material with the particle size of 0-5 microns into the subsequent step, and returning the material with the particle size of more than 5 millimeters to the ball mill with the sieve for crushing again;
(3) and (3) feeding the alpha-alumina powder obtained in the step (2) into a continuous mill for crushing, inspecting and classifying the crushed material through a classifier, conveying the material with the particle size of 0.5-0.8 micrometer to a bagging machine for bagging, and feeding the material with the diameter of more than 0.8 micrometer back to the continuous ball mill for secondary crushing.
2. The ultrafine production process of α -alumina micropowder according to claim 1, wherein in the step (1), the α -alumina raw material is a high-temperature α -alumina lump material fired at 1400 to 1500 ℃.
3. The ultrafine production process of α -alumina micropowder according to claim 1, characterized in that the crusher is a jaw crusher.
4. The ultrafine production process of α -alumina micropowder according to claim 1, characterized in that in the step (3), the continuous ball mill has a diameter of 1.5 to 2 m and a length of 7 to 8 m.
5. The alpha-alumina micropowder ultra-refining production process according to claim 1, characterized in that the ultra-fine powder continuous production line comprises a jaw crusher, a ball mill with a sieve, a continuous ball mill and a bagging machine which are connected in sequence, wherein a first storage silo is arranged between the jaw crusher and the ball mill with the sieve, a second storage silo is arranged between the ball mill with the sieve and the continuous ball mill, and a third storage silo is arranged between the continuous ball mill and the bagging machine.
6. The superfine α -alumina micropowder production process according to claim 1, wherein the material crushed by the jaw crusher is fed into the first storage silo by means of a first plate and chain elevator, and the material in the first storage silo is fed into the ball mill with a screen by means of a vibratory feeder.
7. The ultrafine α -alumina micropowder production process according to claim 1, wherein the ball mill with a sieve can pulverize a material to 0 to 5 μm, and a 5 μm vibrating screen for classification is additionally provided between the ball mill with a sieve and the second plate chain elevator, a material having a diameter of more than 5 μm is returned to the ball mill with a sieve through a transfer pipe, and a material having a diameter of 5 μm or less is introduced into the second plate chain elevator.
8. The superfine α -alumina micropowder production process according to claim 1, wherein a 0-0.8 μm classifier is additionally provided between the continuous ball mill and the third storage silo, and wherein the materials having satisfactory particle size and grade enter the third storage silo via the first screw conveyor, and the materials having unsatisfactory particle size and grade return to the continuous ball mill via the transfer pipe.
9. The ultrafine production process of alpha-alumina micropowder according to claim 1, characterized in that a wind catcher and a dust collecting bin connected with the wind catcher are provided between the classifier and the first screw conveyor, so as to facilitate collection of qualified materials.
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| CN202210056166.XA CN114505152A (en) | 2022-01-18 | 2022-01-18 | Superfine production process of alpha-alumina micropowder |
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| CN202210056166.XA CN114505152A (en) | 2022-01-18 | 2022-01-18 | Superfine production process of alpha-alumina micropowder |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102249236A (en) * | 2011-06-02 | 2011-11-23 | 江苏大阳微粉科技有限公司 | Production process for silicon carbide micropowder |
| CN102814222A (en) * | 2012-08-06 | 2012-12-12 | 东海县晶盛源硅微粉有限公司 | Continuous dry ball milling device |
| CN111484016A (en) * | 2020-04-13 | 2020-08-04 | 宁夏和兴碳基材料有限公司 | Production process of silicon carbide fine powder (70F) |
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- 2022-01-18 CN CN202210056166.XA patent/CN114505152A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102249236A (en) * | 2011-06-02 | 2011-11-23 | 江苏大阳微粉科技有限公司 | Production process for silicon carbide micropowder |
| CN102814222A (en) * | 2012-08-06 | 2012-12-12 | 东海县晶盛源硅微粉有限公司 | Continuous dry ball milling device |
| CN111484016A (en) * | 2020-04-13 | 2020-08-04 | 宁夏和兴碳基材料有限公司 | Production process of silicon carbide fine powder (70F) |
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