CN111545157B - Silicon micropowder modification device and production process thereof - Google Patents
Silicon micropowder modification device and production process thereof Download PDFInfo
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- CN111545157B CN111545157B CN202010478971.2A CN202010478971A CN111545157B CN 111545157 B CN111545157 B CN 111545157B CN 202010478971 A CN202010478971 A CN 202010478971A CN 111545157 B CN111545157 B CN 111545157B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000010703 silicon Substances 0.000 title claims abstract description 41
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 41
- 230000004048 modification Effects 0.000 title claims description 16
- 238000012986 modification Methods 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000003756 stirring Methods 0.000 claims abstract description 94
- 239000003607 modifier Substances 0.000 claims abstract description 61
- 239000000428 dust Substances 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 28
- 150000003376 silicon Chemical class 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 29
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000005303 weighing Methods 0.000 claims description 17
- 230000001804 emulsifying effect Effects 0.000 claims description 15
- 239000000377 silicon dioxide Substances 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 238000009775 high-speed stirring Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 239000010419 fine particle Substances 0.000 claims description 4
- 230000033001 locomotion Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000008213 purified water Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000013019 agitation Methods 0.000 description 11
- 239000000126 substance Substances 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004100 electronic packaging Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010902 jet-milling Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- 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
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses a silicon micropowder modifying device, which comprises a high-stirring modifying machine, wherein a feeding hole of the high-stirring modifying machine is respectively communicated with a silicon micropowder feeding device and a modifier feeding device, and a discharging hole of the high-stirring modifying machine is sequentially connected with a collecting hopper, a pulse dust collector and a high-efficiency air screen device for screening modified silicon micropowder through pipelines.
Description
Technical Field
The invention relates to equipment and a process for modifying and classifying silica powder, in particular to a silica powder modifying device and a modifying process thereof, which can realize large-particle classification particle filtration under the condition of modifying and agglomerating the silica powder added with an auxiliary agent, and belong to the technical field of silica powder modification.
Background
The silicon micropowder is micropowder processed from natural quartz or fused quartz (amorphous SiO2 of natural quartz after high-temperature melting and cooling) by multiple processes such as crushing, ball milling (or vibration and jet milling), flotation, acid washing purification, high-purity water treatment and the like.
The silicon micropowder has excellent performances of high temperature resistance, acid and alkali corrosion resistance, poor thermal conductivity, high insulation, low expansion, stable chemical property, large hardness and the like, and is widely used in fields of chemical industry, electronics, integrated Circuits (ICs), electrical appliances, plastics, coatings, high-grade paint, rubber, national defense and the like, and the modified silicon micropowder has more excellent properties.
The prior art modifies the silicon micro powder by adopting a high-temperature baking mode, and uses a high-temperature steam modifier to carry out condensation reaction modification on the silicon micro powder and the modifier under the stirring of a high-temperature high-speed kneader, wherein the modification mode has unsatisfactory modification effect due to uneven mixing of the silicon micro powder and the modifier, and the modifier and the silicon micro powder are unevenly mixed to easily generate agglomerated large particles, thereby influencing the quality of a finished product of the modified silicon micro powder.
Disclosure of Invention
The invention aims to solve the main technical problem of providing a silicon micro powder modifying device capable of realizing large-particle grading particle filtration under the condition of modifying and agglomerating by adding an auxiliary agent into silicon micro powder.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a silica powder modifying apparatus, includes high stirring modifying machine, and high stirring modifying machine's feed inlet communicates respectively has silica powder feed arrangement and modifier feed arrangement, and high stirring modifying machine's discharge gate has connected gradually through the pipeline and has collected hopper, first pulse dust remover and has the high-efficient air sieve device that is used for carrying out the screening to the modified silica powder.
The following is a further optimization of the above technical solution according to the present invention:
the feeding device comprises a weighing bin, and a discharge port of the weighing bin is communicated with a feed port of the high-stirring modifying machine through a pipeline.
Further optimizing: the modifier feeding device comprises a modifier tank and a metering pump which are sequentially communicated through a communication pipeline, wherein the modifier tank is filled with a modifier, and the modifier is a silane coupling agent KH-560.
Further optimizing: the high stirring modifier comprises a stirring tank, a high-speed stirring device is rotationally arranged in the stirring tank, a heating tank is sleeved outside the stirring tank, a heating device is arranged between the heating tank and the stirring tank, and an automatic cover opening device for automatically opening or closing the upper part of the stirring tank is arranged above the stirring tank.
Further optimizing: the high-speed stirring device comprises a plurality of stirring paddles which are rotatably arranged in a stirring tank, the stirring paddles are driven to rotate by a driving assembly, and ceramic plates which are resistant to 800 ℃ are bonded on the stirring paddles.
Further optimizing: the feed inlet of the collecting hopper is communicated with the discharge outlet of the discharge pipe of the high-stirring modifier through a pipeline, and the discharge outlet of the collecting hopper is communicated with the feed inlet of the first pulse dust collector through a first emulsifying tank.
Further optimizing: the high-efficiency air screen device comprises an FL vertical classifier, wherein a feed inlet of the FL vertical classifier is sequentially communicated with a second emulsifying tank and a buffer hopper through a pipeline, and a feed inlet of the buffer hopper is communicated with a discharge outlet of the first pulse dust collector.
Further optimizing: the discharge port of the FL vertical classifier is sequentially communicated with a cyclone collector and a second pulse dust collector through a pipeline, a spiral conveyer for outputting finished silica powder is arranged below the second pulse dust collector, and a fan is communicated with the second pulse dust collector.
The invention also provides a production process of the silicon micro powder modifying device, the silicon micro powder is used as the raw material, the density is 2.2g/cm, the apparent density is 0.5-0.6g/cm, the surface D50 of the particle size distribution is 7-8 mu m, the coating rate of the modifying agent silane coupling agent KH-560 in the product obtained after modification and classification is 95-98%, and the injection amount of the silane coupling agent KH-560 is 0.5-1% of the weight of the silicon micro powder.
The following is a further optimization of the above technical solution according to the present invention:
the production process specifically comprises the following steps:
1) The silane coupling agent KH-560 is hydrolyzed and clarified: metering a silane coupling agent KH-560 and purified water, then injecting into a modifier tank, then injecting acetic acid to adjust the pH value to 4.5-5, and clarifying;
2) Raw material metering: the silicon micro powder is accurately weighed from a weighing bin and then is injected into a high-stirring modifier, a silane coupling agent KH-560 is accurately metered and injected into the high-stirring modifier through a metering pump, and the injection amount of the silane coupling agent is 0.5-1% of the weight of the silicon micro powder;
3) Modification: the high-stirring modifier controls the temperature to be 120-130 ℃, and the silicon micro powder and the silane coupling agent KH-560 are adsorbed in the cavity of the high-stirring modifier for 50-70 minutes under the high-speed mixing motion to finish the coating process;
4) And (3) material conveying: the modified silicon micro powder falls into a collecting hopper, is connected with a first emulsifying tank, is subjected to gas-solid separation by a first pulse dust collector and is then conveyed to a buffer hopper;
5) Filtering: the modified material enters the FL vertical classifier through a second emulsifying tank, agglomerated particles are filtered by utilizing centrifugal force generated by an impeller of the vertical classifier rotating at a high speed, and the particles are uniformly distributed by utilizing high-efficiency wind screening and deagglomeration;
6) And (3) collecting: the fine particle material enters a fine material discharging part through centrifugal force generated by an impeller of the vertical classifier, then enters a cyclone collector for further gas-solid separation, and the solid is discharged from the lower part and is the majority of the product, and dust-containing gas in the cyclone collector enters a second pulse dust collector for further gas-solid separation.
The invention filters the silicon micropowder agglomerated large particles in a grading way, has uniform particles and high performance, and is better applied to the fields of rubber, paint coating, electronic packaging materials, silicon-based substrates, functional chemical fibers, functional plastics, advanced ceramics, special refractory materials, sealants, adhesives, chemical industry, medicines, pesticides, high polymer composite materials, glass fiber reinforced plastics, cosmetics, printing ink, agricultural seed treatment agents, dry powder extinguishing agents for fire fighting and the like.
The high-stirring modifier adopts an electric heating oil heating controller to control the modification temperature, so that compared with steam heating, the high-stirring modifier is energy-saving and environment-friendly, and resources are saved; the top cover is opened automatically by using the air cylinder and the limiting device, and the operation is convenient, safe and reliable. The machine body and the stirring paddle are protected by the ceramic plate to prevent metal from contacting materials, so that the service life of the equipment is prolonged; pneumatic three-way discharging, automatic discharging and no residue on the machine body.
The classifier has the advantages of effective filtering function, large particle removal, high utilization rate, energy conservation, environmental protection, simple structure, easy manufacture, low failure rate, safety and reliability.
The invention will be further described with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a top view of a high agitation modifier in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of the general structure of a high-agitation modifying machine in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of the FL vertical classifier according to the embodiment of the present invention.
In the figure: 1-a high stirring modifier; 101-an electric motor; 102, an uncapping cylinder; 103-stirring paddles; 104-a limiting device; 105-deflector; 16-an electric heating device; 107-a discharge cylinder; 108-heating the tank; 109-a stirring tank, 111-a top cover; 112-discharge tube; 2-a weighing bin; 3-a modifier tank; 4-a metering pump; 5-a collecting hopper and 6-a first emulsifying tank; 7-a first pulse dust collector; 8-Roots blower; 9-a buffer hopper; 10-a second emulsification tank; 11-FL vertical classifier; 201-a fine material discharging part; 202-a vertical classifier impeller; 203-a vertical classifier upper body; 204-a lower body of the vertical classifier; 205-feeding pipe; 206-coarse material discharge valve; 207-high-efficiency wind screen; 208-diversion cone; 209-a second flow cone; 12-cyclone collector; 13-a second pulse dust collector; 14-a fan; 15-screw conveyor.
Description of the embodiments
Examples: as shown in fig. 1, the silicon micro powder modifying device comprises a high-stirring modifying machine 1, wherein a feeding hole of the high-stirring modifying machine 1 is respectively communicated with a silicon micro powder feeding device and a modifying agent feeding device, and a discharging hole of the high-stirring modifying machine 1 is sequentially connected with a collecting hopper 5, a first pulse dust collector 7 and a high-efficiency air screen device for screening modified silicon micro powder through pipelines.
The feeding device comprises a weighing bin 2, and a discharge port of the weighing bin 2 is communicated with a feeding port of the high-stirring modifier 1 through a pipeline.
The silicon micro powder to be modified is contained in the weighing bin 2, and a weighing meter for accurately weighing the silicon micro powder in the weighing bin 2 is arranged in the weighing bin 2.
The modifier feeding device comprises a modifier tank 3 and a metering pump 4 which are communicated sequentially through a communication pipeline, wherein a liquid inlet of the metering pump 4 is communicated with a liquid outlet of the modifier tank 3, and a liquid outlet of the metering pump 4 is communicated with a feeding port of the high-stirring modifier 1 through the communication pipeline.
The modifier tank 3 is filled with a modifier, and the modifier is a silane coupling agent KH-560 (commercially available).
Chemical name of the silane coupling agent KH-560: gamma-glycidoxypropyl trimethoxysilane.
As shown in fig. 1-3, the high-agitation modifying apparatus 1 comprises an agitation tank 109, a high-speed agitating device is rotatably disposed in the agitation tank 109, a heating tank 108 is sleeved outside the agitation tank 109, a heating device is disposed between the heating tank 108 and the agitation tank 109, and an automatic cover opening device for automatically opening or closing the upper part of the agitation tank 109 is disposed above the agitation tank 109.
The automatic cover opening device comprises a top cover 111 movably arranged above the stirring tank 109, a cover opening cylinder 102 is fixedly arranged on the machine body of the high-stirring modification machine 1, and the telescopic end of the cover opening cylinder 102 is fixedly connected with the top cover 111.
The power output by the cover opening cylinder 102 can enable the telescopic end to extend or retract, the telescopic end of the cover opening cylinder 102 can drive the top cover 111 to move upwards when extending to open the upper port of the stirring tank 109, and the telescopic end of the cover opening cylinder 102 can drive the top cover 111 to move downwards when retracting to enable the top cover 111 to be pressed on the upper port of the stirring tank 109 and be used for closing the upper port of the stirring tank 109.
A limiting device 104 for limiting the moving position of the top cover 111 is fixedly arranged on the machine body of the high-agitation modifying machine 1.
The limiting device 104 is a prior art, and may directly use a telescopic rod, and the movement distance and position of the top cover 111 are limited by the telescopic length of the telescopic rod.
The top cover 111 is provided with a material feed inlet and a modifier feed inlet which are respectively communicated with the stirring cavity of the stirring tank 109.
The high-speed stirring device comprises a plurality of stirring paddles 103 rotatably arranged in a stirring tank 109, the stirring paddles 103 are rotatably connected with the stirring tank 109 through stirring shafts, and the stirring paddles 103 are driven to rotate by a motor 101 arranged outside the stirring tank 109.
The motor 101 drives the stirring shaft to rotate through belt transmission, so that the stirring paddle 103 is driven to rotate in the stirring tank 109, and the stirring paddle is used for stirring the silicon micro powder at a high speed, so that the silicon micro powder can be fully mixed with the modifier.
The stirring paddle 103 is bonded with a ceramic plate resistant to 800 ℃ through ceramic glue, and the ceramic plate is used on the stirring paddle 103, so that the stirring paddle can be used for protection and preventing metal from being in direct contact with the silicon micropowder and the modifier.
A plurality of guide plates 105 are fixedly arranged on the inner wall of the stirring tank 109, and the guide plates 105 are used for guiding the silica micropowder and can be matched with the stirring paddles 103 to break up large agglomerated particles generated when the silica micropowder is mixed with the modifier.
The inner wall of the heating tank 108 and the outer wall of the stirring tank 109 are arranged at intervals, and a heating cavity is arranged between the heating tank 108 and the stirring tank 109.
The heating device comprises heating oil filled in a heating cavity between a heating tank 108 and a stirring tank 109, and an electric heating device 106 is fixedly arranged on the inner wall of the stirring tank 109.
The electric heating device 106 can work by being connected with an external power supply through a temperature controller and a conductive wire.
The electric heating device 106 is operable to heat the heating oil, and the heating oil is warmed up to transfer the heat to the stirring tank 109, thereby heating the stirring tank 109.
The three-way discharging device for outputting materials is arranged at a position, close to the lower part of the heating tank 108, and comprises a discharging pipe 112, the whole structure of the discharging pipe 112 is in a three-way pipe shape, and a feeding hole of the discharging pipe 112 penetrates through the heating tank 108 and the stirring tank 109 and is communicated with a stirring cavity of the stirring tank 109.
The discharging pipe 112 is fixedly provided with a discharging cylinder 107, and a plug for controlling the opening or closing of the discharging opening is fixedly connected to the telescopic end of the discharging cylinder 107.
The telescopic end of the discharging cylinder 107 can be driven to extend or retract by the output power of the discharging cylinder 107, and when the telescopic end of the discharging cylinder 107 extends, the plug can be driven to move and approach to the discharging opening, so that the discharging opening is closed.
The telescopic end of the discharging cylinder 107 can drive the plug to move and away from the discharging opening when retracting, so as to open the discharging opening.
As shown in fig. 1, the feed inlet of the collecting hopper 5 is communicated with the discharge outlet of the discharge pipe 112 of the high-agitation modifying machine 1 through a pipeline.
The discharge port of the collecting hopper 5 is communicated with a first emulsifying tank 6 for accelerating pneumatic conveying of modified silica powder through a pipeline, and the discharge port of the first emulsifying tank 6 is communicated with the feed port of a first pulse dust collector 7 through a pipeline.
The first pulse dust collector 7 is communicated with a Roots blower 8, the first pulse dust collector 7 is used for carrying out solid-gas separation on modified silica powder, the silica powder is discharged from the lower part, and gas is pumped to the outside of the first pulse dust collector 7 through the Roots blower 8.
The lower part of the first pulse dust collector 7 is provided with a buffer hopper 9, and a feed inlet of the buffer hopper 9 is communicated with a discharge outlet of the first pulse dust collector 7 through a pipeline.
The discharge port of the buffer hopper 9 is communicated with a second emulsifying tank 10 through a pipeline.
As shown in fig. 1 and 4, the high-efficiency air screen device comprises a FL vertical classifier 11 for filtering large particles of modified silica micropowder, and a feed inlet of the FL vertical classifier 11 is communicated with a discharge outlet of a second emulsifying tank 10 through a pipeline.
The discharge port of the FL vertical classifier 11 is sequentially communicated with a cyclone collector 12 and a second pulse dust collector 13 through pipelines.
A spiral conveyer 15 for outputting finished silica powder is arranged below the second pulse dust collector 13 and at the discharging outlet of the second pulse dust collector.
The second pulse dust collector 13 is communicated with a fan 14, the fan 14 is an induced draft fan, and the fan 14 is provided with an induced draft fan air outlet pipe.
The FL vertical classifier 11 comprises a lower vertical classifier body 204, a feed pipe 205 is fixedly arranged on the side wall of the lower vertical classifier body 204, and a high-efficiency air screen 207 for screening falling materials again is fixedly welded in the lower vertical classifier body 204.
The lower body 204 of the vertical classifier is detachably and fixedly connected with a diversion cone 208 through bolts.
The feeding pipe 205 is detachably and fixedly connected with a second diversion cone 209 through bolts.
The lower end of the lower body 204 of the vertical classifier is provided with a coarse material discharge valve 206 for outputting coarse material.
The upper end of the vertical classifier lower body 204 is provided with a vertical classifier upper body 203.
The vertical classifier impeller 202 is arranged in the vertical classifier upper body 203, and the vertical classifier impeller 202 is connected with a driving device.
The upper part of the upper body 203 of the vertical classifier is provided with a fine material discharging part 201.
After the FL vertical classifier 2 introduces the material through the feed pipe 205, the FL vertical classifier 2 makes the material rise to the classification area through the ascending air flow from the classified feed pipe 205, and then makes the coarse and fine materials separate through the strong centrifugal force generated by the high-speed rotation of the vertical classifier impeller 202, and the material meeting the particle size requirement is collected by the cyclone collector 12 and the second pulse dust collector 13 through the fine material discharging part 201.
Coarse particles fall through the high-efficiency air screen 207 at the middle end of the cylinder of the lower body 204 of the vertical classifier, external natural air is rotationally cut into the cylinder of the lower body 204 of the vertical classifier through the high-efficiency air screen 207, rotating air flow is formed, and centrifugal force is generated by the rotating air flow to separate coarse and fine materials again.
Fine particles rise into the flow guiding cone region, the sectional area of the flow guiding cone region is reduced, the flow speed is improved, the rotating air flow drives the particles to collide at a high speed, and the particle size of the particles is reduced. The material continues to rise to the classification zone for classification and coarse particles are discharged through discharge valve 206.
As shown in fig. 1-4, a production process of a silica micropowder modifying device comprises the following steps: the raw material is silicon micropowder with density of 2.2g/cm, apparent density of 0.5-0.6g/cm, and particle size distribution surface D50 of 7-8um.
The modifier adopts a silane coupling agent KH-560 (commercially available), and the chemical name is: gamma-glycidoxypropyl trimethoxysilane.
Detection instrument: mastersizer 3000 laser particle size analyzer.
The modification method comprises the following steps: injecting a silane coupling agent KH-560 into purified water for hydrolysis, wherein the injection amount is 50% of that of the silane coupling agent, then injecting acetic acid to adjust the pH value to 4.5-5, and clarifying.
The silicon micro powder and the silane coupling agent KH-560 are injected into a high-stirring modifier for surface modification, the injection amount of the silane coupling agent KH-560 is 0.5-1% of the weight of the silicon micro powder, and the injection ratio is realized by a weighing bin and a modifier metering pump.
When the high stirring modifier is used for modifying the mixture of the materials and the modifier, the temperature is controlled to be 120-130 ℃, and the mixture is stirred for 60 minutes.
The coating rate of the silica micropowder after the modification is finished reaches 95% -98%; the modified silica micropowder has reduced oil absorption, strong hydrophobicity, high activation index, agglomeration phenomenon of the silica micropowder and uneven particle size distribution.
The production process specifically comprises the following steps:
1. the silane coupling agent KH-560 is hydrolyzed and clarified:
the silane coupling agent KH-560 and purified water are injected into a modifier tank 3 after being metered, then acetic acid is injected into the modifier tank to adjust the pH value to 4.5-5, and the mixture is clarified.
2. Raw material metering:
the silicon micro powder is accurately metered and injected into the high-stirring modifier 1 from the weighing bin 2 through a weighing sensor, the silane coupling agent KH-560 is accurately metered and injected into the high-stirring modifier 1 through the metering pump 4, and the injection amount of the silane coupling agent is 0.5-1% of the weight of the silicon micro powder.
3. Modification:
the high-stirring modifier controls the temperature to be 120-130 ℃, and the silicon micro powder and the silane coupling agent KH-560 are adsorbed in the cavity of the high-stirring modifier 1 for 50-70 minutes under the high-speed mixing motion with high dispersion to finish the coating process.
4. And (3) material conveying:
the modified silicon micro powder falls into a collecting hopper 5, is connected with a first emulsifying tank 6, is subjected to gas-solid separation by a first pulse dust collector 7 and is then conveyed to a buffer hopper 9.
5. Filtering:
the modified material enters the FL vertical classifier 11 through the second emulsifying tank 10, agglomerated particles are filtered out by the centrifugal force generated by the high-speed rotating vertical classifier impeller 202, and the particles are uniformly distributed by depolymerization of the high-efficiency air screen 207.
6. And (3) collecting:
the fine particle material enters the fine material discharging part 201 through the centrifugal force generated by the impeller 202 of the vertical classifier, then enters the cyclone collector 12 for further gas-solid separation, and the solid is discharged from the lower part and is the majority of the product.
The dust-containing gas in the cyclone collector 12 enters the second pulse dust collector 13 for further gas-solid separation, the solid is collected as a product, and the gas is pumped out by the induced draft fan 14 for exhausting.
Claims (1)
1. A production process of a silicon micropowder modification device is characterized in that: the silicon micropowder modifying device comprises a high-stirring modifying machine (1), wherein a feeding port of the high-stirring modifying machine (1) is respectively communicated with a silicon micropowder feeding device and a modifier feeding device, and a discharging port of the high-stirring modifying machine (1) is sequentially connected with a collecting hopper (5), a first pulse dust remover (7) and a high-efficiency air screen device for screening modified silicon micropowder through pipelines;
the feeding device comprises a weighing bin (2), and a discharge port of the weighing bin (2) is communicated with a feed port of the high-stirring modifier (1) through a pipeline;
the modifier feeding device comprises a modifier tank (3) and a metering pump (4) which are sequentially communicated through a communication pipeline, wherein the modifier tank (3) is internally filled with a modifier, and the modifier is a silane coupling agent KH-560;
the high-stirring modifier (1) comprises a stirring tank (109), a high-speed stirring device is rotationally arranged in the stirring tank (109), a heating tank (108) is sleeved outside the stirring tank (109), a heating device is arranged between the heating tank (108) and the stirring tank (109), and an automatic cover opening device for automatically opening or closing the upper part of the stirring tank (109) is arranged above the stirring tank (109);
the high-speed stirring device comprises a plurality of stirring paddles (103) rotatably arranged in a stirring tank (109), the stirring paddles (103) are driven to rotate by a driving assembly, and ceramic plates resistant to 800 ℃ are adhered to the stirring paddles (103);
the feed inlet of the collecting hopper (5) is communicated with the discharge outlet of the discharge pipe (112) of the high-stirring modifier (1) through a pipeline, and the discharge outlet of the collecting hopper (5) is communicated with the feed inlet of the first pulse dust collector (7) through the first emulsifying tank (6);
the high-efficiency air screen device comprises an FL vertical classifier (11), wherein a feed inlet of the FL vertical classifier (11) is sequentially communicated with a second emulsifying tank (10) and a buffer hopper (9) through a pipeline, and a feed inlet of the buffer hopper (9) is communicated with a discharge outlet of a first pulse dust collector (7);
the discharge port of the FL vertical classifier (11) is sequentially communicated with a cyclone collector (12) and a second pulse dust collector (13) through a pipeline, a spiral conveyer (15) for outputting finished silica powder is arranged below the second pulse dust collector (13) and below the discharge port of the second pulse dust collector, and a fan (14) is communicated with the second pulse dust collector (13); the raw materials in the production process are silicon micropowder, the density is 2.2g/cm, the apparent density is 0.5-0.6g/cm, the surface D50 of the particle size distribution is 7-8 mu m, the coating rate of the modifier silane coupling agent KH-560 in the product obtained after modification and classification is 95-98%, and the injection amount of the silane coupling agent KH-560 is 0.5-1% of the weight of the silicon micropowder;
the production process specifically comprises the following steps:
1) The silane coupling agent KH-560 is hydrolyzed and clarified: metering a silane coupling agent KH-560 and purified water, then injecting the mixture into a modifier tank (3), then injecting acetic acid to adjust the pH value to 4.5-5, and clarifying;
2) Raw material metering: the silicon micro powder is accurately weighed from a weighing bin (2) and then is injected into a high-stirring modifier (1), a silane coupling agent KH-560 is accurately metered and injected into the high-stirring modifier (1) through a metering pump (4), and the injection amount of the silane coupling agent is 0.5-1% of the weight of the silicon micro powder;
3) Modification: the high-stirring modifier controls the temperature to be between 120 and 130 ℃, and the silicon micro powder and the silane coupling agent KH-560 are adsorbed in the cavity of the high-stirring modifier (1) for 50 to 70 minutes under the high-speed mixing motion to finish the coating process;
4) And (3) material conveying: the modified silicon micro powder falls into a collecting hopper (5), is connected with a first emulsifying tank (6), is subjected to gas-solid separation by a first pulse dust collector (7) and is then conveyed to a buffer hopper (9);
5) Filtering: the modified material enters the FL vertical classifier (11) through the second emulsifying tank (10), agglomerated particles are filtered by utilizing centrifugal force generated by a vertical classifier impeller (202) rotating at high speed, and the agglomerated particles are uniformly distributed by utilizing the depolymerization of a high-efficiency air screen (207);
6) And (3) collecting: the fine particle material enters a fine material discharging part (201) through centrifugal force generated by an impeller (202) of the vertical classifier, then enters a cyclone collector (12) for further gas-solid separation, the solid is discharged from the lower part and is the majority of the product, and dust-containing gas in the cyclone collector (12) enters a second pulse dust collector (13) for further gas-solid separation.
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| CN114505148B (en) * | 2022-02-08 | 2023-02-28 | 苏州锦艺新材料科技股份有限公司 | Production device for surface modification of silicon micropowder |
| CN115275119B (en) * | 2022-08-23 | 2024-07-30 | 浙江省建筑材料科学研究所有限公司 | Preparation device and preparation method of silicon micropowder composite coated anode material |
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