CN111545157A - Silicon micropowder modification device and production process thereof - Google Patents
Silicon micropowder modification device and production process thereof Download PDFInfo
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- CN111545157A CN111545157A CN202010478971.2A CN202010478971A CN111545157A CN 111545157 A CN111545157 A CN 111545157A CN 202010478971 A CN202010478971 A CN 202010478971A CN 111545157 A CN111545157 A CN 111545157A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 230000004048 modification Effects 0.000 title claims description 39
- 238000012986 modification Methods 0.000 title claims description 39
- 239000010703 silicon Substances 0.000 title claims description 39
- 229910052710 silicon Inorganic materials 0.000 title claims description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000003756 stirring Methods 0.000 claims abstract description 82
- 239000000428 dust Substances 0.000 claims abstract description 37
- 238000012216 screening Methods 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 53
- 239000003607 modifier Substances 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 33
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 28
- 239000000843 powder Substances 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000000377 silicon dioxide Substances 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 17
- 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
- 239000007787 solid Substances 0.000 claims description 10
- 230000001804 emulsifying effect Effects 0.000 claims description 9
- 150000003376 silicon Chemical class 0.000 claims description 9
- 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
- 238000004945 emulsification Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000010419 fine particle Substances 0.000 claims description 6
- 238000009775 high-speed stirring Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims 2
- 230000008020 evaporation Effects 0.000 claims 2
- 239000010409 thin film Substances 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 239000011863 silicon-based powder Substances 0.000 abstract 2
- 238000005457 optimization Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000013019 agitation Methods 0.000 description 3
- 239000007788 liquid Substances 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
- 239000008187 granular material Substances 0.000 description 2
- 239000002184 metal Substances 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
- 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
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 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
- 238000005520 cutting process Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004100 electronic packaging Methods 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
- 238000004898 kneading 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
- 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
- 239000012498 ultrapure water Substances 0.000 description 1
Images
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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses a silicon powder modifying device, which comprises a high-stirring modifying machine, wherein a feed inlet of the high-stirring modifying machine is respectively communicated with a silicon powder feeding device and a modifying agent feeding device, and a discharge outlet 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 powder through pipelines.
Description
Technical Field
The invention relates to equipment and a process for modifying and grading silicon micropowder, in particular to a silicon micropowder modifying device and a modifying process thereof, which can realize large-particle graded particle filtration under the condition that auxiliary agents are added to the silicon micropowder for modification and agglomeration, and belongs to the technical field of silicon micropowder modification.
Background
The silicon micropowder is prepared from natural quartz or fused quartz (amorphous SiO2 obtained by melting and cooling natural quartz at high temperature) by crushing, ball milling (or vibration and jet milling), flotation, acid cleaning and purification, high-purity water treatment and other processes.
The silicon micropowder has excellent performances of high temperature resistance, acid and alkali corrosion resistance, poor thermal conductivity, high insulation, low expansion, stable chemical performance, high hardness and the like, and is widely applied to the fields of chemical industry, electronics, Integrated Circuits (IC), electric appliances, plastics, coatings, high-grade paint, rubber, national defense and the like, and the modified silicon micropowder has more excellent properties.
The existing method for modifying the silicon micropowder adopts a high-temperature baking mode to modify, a high-temperature steam modifying machine is used for carrying out condensation reaction modification on the silicon micropowder and a modifier under the stirring of a high-temperature high-speed kneading machine, the modification mode has an unsatisfactory modification effect due to the uneven mixing of the silicon micropowder and the modifier, and agglomerated large particles are easily generated due to the uneven mixing of the modifier and the silicon micropowder, so that the finished product quality of the modified silicon micropowder is influenced.
Disclosure of Invention
The invention aims to solve the main technical problem of providing a silica powder modification device capable of realizing large-particle classification particle filtration under the condition of adding an auxiliary agent into silica powder for modification and agglomeration.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a silica powder modification device, includes that the height stirs the modification machine, and the feed inlet that the height stirred the modification machine communicates respectively has silica powder feed arrangement and modifier feed arrangement, and the discharge gate that the height stirred the modification machine has connected gradually through the pipeline and has collected hopper, pulse dust collector and have and be used for carrying out the high-efficient air screen device that sieves to the silica powder of modifying the completion.
The following is a further optimization of the above technical solution of the present invention:
the feeding device comprises a weighing bin, and a discharge port of the weighing bin is communicated with a feed inlet of the high-stirring modifying machine through a pipeline.
Further optimization: the modifier feeding device comprises a modifier tank and a metering pump which are sequentially communicated through a communication pipeline, wherein a modifier is contained in the modifier tank, and the modifier is a silane coupling agent KH-560.
Further optimization: the high stirring modification machine comprises a stirring tank, a high-speed stirring device is arranged in the stirring tank in a rotating mode, 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 used for automatically opening or closing the upper portion of the stirring tank is arranged above the stirring tank.
Further optimization: the high-speed stirring device comprises a plurality of stirring paddles which are rotatably arranged in the stirring tank, the stirring paddles are driven to rotate by the driving assembly, and the stirring paddles are bonded with temperature-resistant ceramic plates.
Further optimization: the feed inlet of collecting the hopper passes through the pipeline and stirs the discharge gate intercommunication of the discharge tube of modification machine with high, and the discharge gate of collecting the hopper passes through the feed inlet intercommunication of first emulsification tank and pulse dust collector.
Further optimization: the high-efficiency air screening device comprises an FL vertical classifier, a feed inlet of the FL vertical classifier is sequentially communicated with a second emulsifying tank and a buffer hopper through pipelines, and a feed inlet of the buffer hopper is communicated with a discharge outlet of the pulse dust collector.
Further optimization: the discharge port of the FL vertical classifier is sequentially communicated with a cyclone collector and a pulse dust collector through a pipeline, a spiral conveyor for outputting finished silicon micropowder is arranged below the pulse dust collector at a discharge outlet of the pulse dust collector, and the pulse dust collector is communicated with a fan.
The invention also provides a production process of the silicon micropowder modification device, the raw materials are silicon micropowder, the density is 2.2g/cm, the loose loading density is 0.5-0.6g/cm, the grain size distribution surface is D507-8um, the coating rate of the modifier silane coupling agent KH-560 in the product obtained by 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 following is a further optimization of the above technical solution of the present invention:
the production process specifically comprises the following steps:
1) hydrolyzing and clarifying a silane coupling agent KH-560: measuring a silane coupling agent KH-560 with purified water, injecting into a modifier tank, then injecting acetic acid to adjust the pH value to 4.5-5, and clarifying;
2) raw material metering: silicon micropowder is precisely weighed from a weighing bin and then injected into a high-stirring modifying machine, and a silane coupling agent KH-560 is accurately metered and injected into the high-stirring modifying machine through a metering pump, wherein the injection amount of the silane coupling agent is 0.5-1% of the weight of the silicon micropowder;
3) modification: the control temperature of the high-stirring modifier is between 120 ℃ and 130 ℃, and the silicon micropowder and the silane coupling agent KH-560 are adsorbed in the cavity of the modifier for 50-70 minutes under the high-dispersion and high-speed mixing motion to finish the coating process;
4) material conveying: the modified silicon micropowder falls into a collecting hopper, is connected with a first emulsifying tank, is subjected to gas-solid separation by a pulse dust collector and is conveyed to a buffer hopper;
5) filtering: the modified material enters an FL vertical classifier through a second emulsification tank, agglomerated particles are filtered by centrifugal force generated by an impeller of the vertical classifier rotating at high speed, and the particles are uniformly distributed by deagglomeration through a high-efficiency air screen;
6) collecting: the fine particle materials enter a fine material discharging part through centrifugal force generated by an impeller of the vertical classifier, then enter a cyclone collector for further gas-solid separation, and the gas containing dust in the cyclone collector enters a bag type dust filter for further gas-solid separation because the gas is discharged from the lower part and is the majority of the product.
The invention filters the agglomerated large particles of the silicon micropowder by classification, has uniform particles and high performance, and is better applied to the fields of rubber, paint coating, electronic packaging material, silicon-based substrate, functional chemical fiber, functional plastic, high-grade ceramic, special refractory material, sealant, binder, chemical industry, medicine, pesticide, high-molecular composite material, glass fiber reinforced plastic, cosmetics, printing ink, agricultural seed treating agent, fire-fighting dry powder extinguishing agent and the like.
The modification machine adopts an electric heating oil heating control instrument to control the modification temperature, and compared with steam heating, the modification machine is energy-saving and environment-friendly, and saves resources; the top cover is automatically opened by using the air cylinder and the limiting device, and the automatic opening device is convenient to operate, safe and reliable. The machine body and the stirring paddle use ceramic plates for protection to prevent metal from contacting with materials, so that the service life of the equipment is prolonged; the pneumatic tee joint is used for discharging, the discharging is automatic, and the machine body has no residue.
The grader uses effective filtering function, gets rid of the large granule, improves the energy-concerving and environment-protective of rate of utilization, grader simple structure, easily manufacturing, the fault rate is low, safe and reliable.
The invention is further illustrated with reference to the following figures 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 modification machine in an embodiment of the present invention;
FIG. 3 is a cross-sectional view showing the overall structure of a high agitation modification machine in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an FL vertical classifier in an embodiment of the present invention.
In the figure: 1-high stirring modifying machine; 101-a motor; 102-a decapping cylinder; 103-stirring paddle; 104-a limiting device; 105-a deflector; 16-an electric heating device; 107-a discharge cylinder; 108-a heating tank; 109-stirring tank, 111-top cover; 112-a discharge pipe; 2-weighing a stock bin; 3-modifier tank; 4-a metering pump; 5-a collection hopper, 6-a first emulsification tank; 7-a pulse dust collector; 8-Roots blower; 9-a buffer hopper; 10-a second emulsification tank; 11-FL vertical grader; 201-fine material discharge part; 202-vertical classifier impeller; 203-vertical grader upper body; 204-a lower body of the vertical classifier; 205-feed pipe; 206-coarse material discharge valve; 207-high efficiency air screen; 208-a guide cone; 209-a second guide cone; 12-a cyclone collector; 13-a pulse dust collector; 14-a fan; 15-screw conveyor.
Detailed Description
Example (b): as shown in fig. 1, a silica powder modification device, including high modification machine 1 that stirs, the feed inlet that high modification machine 1 was stirred to the height communicates respectively has silica powder feed arrangement and modifier feed arrangement, the discharge gate that high modification machine 1 was stirred through the pipeline connect gradually collect hopper 5, pulse dust collector 7 and have and be used for carrying out the high-efficient air screen device that sieves to the silica powder of modifying the completion.
The feeding device comprises a weighing bin 2, and a discharge hole of the weighing bin 2 is communicated with a feed inlet of the high-stirring modifying machine 1 through a pipeline.
The weighing bin 2 is filled with silica powder to be modified, and the weighing bin 2 is internally provided with a weighing meter for accurately weighing the silica powder in the weighing bin 2.
The modifier feeding device comprises a modifier tank 3 and a metering pump 4 which are sequentially communicated through a communicating pipeline, 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 feed inlet of the high-stirring modifier 1 through the communicating pipeline.
The modifier tank 3 is filled with a modifier, and the modifier is a silane coupling agent KH-560 (commercially available).
The chemical name of the silane coupling agent KH-560 is as follows: gamma-glycidoxypropyltrimethoxysilane.
As shown in fig. 1-3, the high-speed stirring modification machine 1 includes a stirring tank 109, a high-speed stirring device is rotatably disposed in the stirring tank 109, a heating tank 108 is sleeved outside the stirring tank 109, a heating device is disposed between the heating tank 108 and the stirring tank 109, and an automatic cover opening device for automatically opening or closing the upper portion of the stirring tank 109 is disposed above the stirring 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 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 uncovering cylinder 102 can enable the telescopic end to extend out or retract, the telescopic end of the uncovering cylinder 102 can drive the top cover 111 to move upwards when extending out, so that the upper port of the stirring tank 109 can be opened, and the telescopic end of the uncovering cylinder 102 can drive the top cover 111 to move downwards when retracting, so that the top cover 111 is pressed on the upper port of the stirring tank 109 and used for closing the upper port of the stirring tank 109.
And a limiting device 104 for limiting the moving position of the top cover 111 is fixedly arranged on the machine body of the high-stirring modifying machine 1.
The limiting device 104 is a device of the prior art, which can directly adopt a telescopic rod, and the telescopic length of the telescopic rod is used for limiting the moving distance and position of the top cover 111.
And the top cover 111 is respectively provided with a material feeding hole and a modifier feeding hole which are communicated with the stirring cavity of the stirring tank 109.
The high-speed stirring device comprises a plurality of stirring paddles 103 which are rotatably arranged in the 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 which is 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 is used for stirring the silica powder at a high speed, and the silica powder can be fully mixed with the modifier.
The stirring paddle 103 is bonded with a 800 ℃ resistant ceramic chip through ceramic glue, and the ceramic chip is used on the stirring paddle 103 and can be used for protection to prevent metal from directly contacting with the silicon micro powder and the modifier.
Fixed a plurality of guide plates 105 that are provided with on agitator tank 109's the inner wall, guide plate 105 is used for carrying out the water conservancy diversion to silica powder to can cooperate the stirring rake 103 to be used for smashing the reunion large granule that produces when silica powder mixes 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 mounted 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 conducting wire.
The electric heating device 106 can heat the heating oil when working, and the heat can be transferred to the stirring tank 109 by heating the heating oil, so that the stirring tank 109 can be heated.
The utility model discloses a material mixing device, including heating tank 108, agitator tank 109 and agitator tank 109, the position department of being close to its below is provided with the tee bend discharge apparatus who is used for the material of output on the heating tank 108, tee bend discharge apparatus includes discharge tube 112, discharge tube 112's overall structure is tee bend tubulose, the feed inlet of discharge tube 112 runs through heating tank 108 and agitator tank 109's stirring chamber intercommunication.
The discharging pipe 112 is fixedly provided with a discharging cylinder 107, and the telescopic end of the discharging cylinder 107 is fixedly connected with a plug for controlling the opening or closing of the discharging opening.
The output power of the discharging cylinder 107 can drive the telescopic end to extend out or retract, and the telescopic end of the discharging cylinder 107 can drive the plug to move and approach the discharging opening when extending out, so that the discharging opening can be closed.
When the telescopic end of the discharging cylinder 107 retracts, the plug can be driven to move and be far away from the discharging opening, and the discharging opening is opened.
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 modification machine 1 through a pipeline.
The discharge port of the collecting hopper 5 is communicated with a first emulsifying tank 6 used for accelerating pneumatic conveying of modified silicon micropowder through a pipeline, and the discharge port of the first emulsifying tank 6 is communicated with the feed inlet of a pulse dust collector 7 through a pipeline.
The pulse dust collector 7 is communicated with a Roots blower 8, the pulse dust collector 7 is used for carrying out solid-gas separation on the modified silicon micropowder, the silicon micropowder is separated from the lower part, and the gas is pumped to the outside of the pulse dust collector 7 through the Roots blower 8.
And a buffer hopper 9 is arranged below the pulse dust collector 7, and a feed inlet of the buffer hopper 9 is communicated with a discharge outlet of the pulse dust collector 7 through a pipeline.
And a discharge hole 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 screening device comprises a FL vertical classifier 11 for filtering large particles of the modified fine silica powder, and a feed inlet of the FL vertical classifier 11 is communicated with a discharge outlet of the second emulsification tank 10 through a pipeline.
And a discharge port of the FL vertical classifier 11 is sequentially communicated with a cyclone collector 12 and a pulse dust collector 13 through pipelines.
And a screw conveyor 15 for outputting the finished silicon micropowder is arranged below the pulse dust collector 13 at a discharge outlet of the pulse dust collector.
The pulse dust collector 13 is communicated with a fan 14, the fan 14 is a draught fan, and a draught fan air outlet pipe is arranged on the fan 14.
The FL vertical classifier 11 comprises a vertical classifier lower body 204, a feeding pipe 205 is fixedly arranged on the side wall of the vertical classifier lower body 204, and a high-efficiency air screen 207 for re-screening falling materials is fixedly welded inside the vertical classifier lower body 204.
The lower body 204 of the vertical classifier is detachably and fixedly connected with a guide cone 208 through a bolt.
The feeding pipe 205 is detachably and fixedly connected with a second guide cone 209 through a bolt.
The lower end of the lower body 204 of the vertical classifier is provided with a coarse material discharge valve 206 for outputting coarse materials.
The upper end of the lower body 204 of the vertical classifier is provided with an upper body 203 of the vertical classifier.
The vertical classifier impeller 202 is arranged in the upper body 203 of the vertical classifier, and the vertical classifier impeller 202 is connected with a driving device.
The upper part of the upper machine 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 feeding pipe 205, the FL vertical classifier 2 causes the material to rise to the classification region through the ascending air current from the classified feeding pipe 205, and then causes the coarse and fine materials to be separated 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 pulse dust collector 13 through the fine material discharging part 201.
The coarse particles fall through a high-efficiency air screen 207 at the middle end of the cylinder of the lower body 204 of the vertical classifier, external natural air enters the cylinder of the lower body 204 of the vertical classifier in a rotary cutting mode through the high-efficiency air screen 207 to form rotary air flow, and the rotary air flow generates centrifugal force to separate coarse materials from fine materials again.
The fine particles rise to enter the diversion cone area, the sectional area of the diversion cone area is reduced, the flow speed is improved, the rotating airflow drives the particles to collide at high speed, and the particle size of the particles is reduced. The material continues to rise to the classification zone for sorting and the coarse particles are discharged through discharge valve 206.
As shown in fig. 1 to 4, a production process of a fine silica powder modification apparatus: the raw material is silicon micropowder, the density is 2.2g/cm, the loose loading density is 0.5-0.6g/cm, and the grain size distribution surface is D507-8 um.
The modifier adopts a silane coupling agent KH-560 (commercially available), and the chemical name: gamma-glycidoxypropyltrimethoxysilane.
A detection instrument: mastersizer 3000 laser particle size analyzer.
The modification method comprises the following steps: injecting pure water into the silane coupling agent KH-560 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.
Injecting the silicon micropowder and a silane coupling agent KH-560 into a high-stirring modifying machine for surface modification, wherein the injection amount of the silane coupling agent KH-560 is 0.5-1% of the weight of the silicon micropowder, and the injection proportion is realized by a weighing bin and a modifier metering pump.
When the high-stirring modifying machine is used for mixing the material and the modifying agent for modification, the temperature is controlled at 120 ℃ and 130 ℃, and the stirring is carried out for 60 minutes.
The coating rate of the silicon micro powder after the modification is 95-98%. The oil absorption of the modified silicon micropowder is reduced, the hydrophobicity is strong, the activation index is high, the agglomeration phenomenon of the silicon micropowder occurs, and the particle size distribution is not uniform.
The production process specifically comprises the following steps:
1. hydrolyzing and clarifying a silane coupling agent KH-560:
measuring silane coupling agent KH-560 with purified water, injecting into modifier tank 3, then injecting acetic acid to adjust pH to 4.5-5, and clarifying.
2. Raw material metering:
the silicon micropowder is precisely metered and injected into the high-stirring modifying machine 1 from the weighing bin 2 through the weighing sensor, and the silane coupling agent KH-560 is precisely metered and injected into the high-stirring modifying machine 1 through the metering pump 4, wherein the injection amount of the silane coupling agent is 0.5-1% of the weight of the silicon micropowder.
3. Modification:
the control temperature of the high-stirring modifier is between 120 ℃ and 130 ℃, and the silicon micropowder and the silane coupling agent KH-560 are adsorbed in the cavity of the modifier 1 for 50-70 minutes under the high-dispersion and high-speed mixing motion to finish the coating process.
4. Material conveying:
the modified silicon micropowder falls into a collecting hopper 5, is connected with a first emulsifying tank 6, is subjected to gas-solid separation by a pulse dust collector 7 and then is conveyed to a buffer hopper 9.
5. Filtering:
the modified material enters an FL vertical classifier 11 through a second emulsification tank 10, agglomerated particles are filtered by centrifugal force generated by a vertical classifier impeller 202 rotating at high speed, and the particles are uniformly distributed by depolymerization through a high-efficiency air screen 207.
6. Collecting:
the fine particle material enters the fine material discharging part 201 through the centrifugal force generated by the vertical classifier impeller 202, and then enters the cyclone collector 12 for further gas-solid separation, and the fine particle material is discharged from the lower part and is the majority of the product.
The dust-containing gas in the cyclone collector 12 enters a bag type dust filter 13 for further gas-solid separation, the solid is collected into a product, and the gas is pumped out by an induced draft fan 14 for exhaust.
Claims (10)
1. A silica micropowder modification device is characterized in that: the high-efficiency air screen device comprises a high-stirring modifying machine (1), wherein a feed inlet of the high-stirring modifying machine (1) is respectively communicated with a silicon micropowder feeding device and a modifier feeding device, and a discharge outlet of the high-stirring modifying machine (1) is sequentially connected with a collecting hopper (5), a pulse dust collector (7) and a high-efficiency air screen device for screening modified silicon micropowder through pipelines.
2. A fine silica powder modifying apparatus according to claim 1, characterized in that: the feeding device comprises a weighing bin (2), and a discharge hole of the weighing bin (2) is communicated with a feed inlet of the high-stirring modifying machine (1) through a pipeline.
3. A fine silica powder modifying apparatus according to claim 2, characterized in that: the modifier feeding device comprises a modifier tank (3) and a metering pump (4) which are sequentially communicated through a communication pipeline, wherein a modifier is contained in the modifier tank (3), and the modifier is a silane coupling agent KH-560.
4. A fine silica powder modifying apparatus according to claim 3, characterized in that: high stirring modification machine (1) is including agitator tank (109), and agitator tank (109) internal rotation is provided with high-speed agitating unit, and the outside cover of agitator tank (109) is equipped with heating tank (108), is provided with heating device between heating tank (108) and agitator tank (109), and the top of agitator tank (109) is provided with the automatic device of uncapping that is used for automizing to open or close agitator tank (109) top.
5. A fine silica powder modifying apparatus according to claim 4, characterized in that: the high-speed stirring device comprises a plurality of stirring paddles (103) which are rotatably arranged in a stirring tank (109), the stirring paddles (103) are driven to rotate by a driving component, and ceramic plates resistant to the temperature of (800) DEG C are bonded on the stirring paddles (103).
6. A fine silica powder modifying apparatus according to claim 5, characterized in that: the feed inlet of the collection hopper (5) is communicated with the discharge outlet of a discharge pipe (112) of the high-stirring modifying machine (1) through a pipeline, and the discharge outlet of the collection hopper (5) is communicated with the feed inlet of the pulse dust collector (7) through a first emulsifying tank (6).
7. A fine silica powder modifying apparatus according to claim 6, characterized in that: the high-efficiency air screening device comprises an FL vertical classifier (11), a feed inlet of the FL vertical classifier (11) is sequentially communicated with a second emulsifying tank (10) and a buffer hopper (9) through pipelines, and a feed inlet of the buffer hopper (9) is communicated with a discharge outlet of a pulse dust collector (7).
8. A fine silica powder modifying apparatus according to claim 7, characterized in that: the discharge port of the FL vertical classifier (11) is sequentially communicated with a cyclone collector (12) and a pulse dust collector (13) through a pipeline, a spiral conveyor (15) for outputting finished silicon micropowder is arranged at the discharge outlet of the pulse dust collector (13), and a fan (14) is communicated with the pulse dust collector (13).
9. The production process of the fine silica powder modifying apparatus according to any one of claims 1 to 8, characterized in that: the raw material is silicon micropowder, the density is 2.2g/cm, the loose loading density is 0.5-0.6g/cm, the grain size distribution surface D507-8um is obtained by carrying out thin film evaporation and thin film evaporation, the coating rate of a modifier silane coupling agent KH-560 in the product obtained by 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.
10. The production process according to claim 9, characterized in that: the production process specifically comprises the following steps:
1) hydrolyzing and clarifying a silane coupling agent KH-560: measuring a silane coupling agent KH-560 with purified water, injecting into a modifier tank (3), then injecting acetic acid to adjust the pH value to 4.5-5, and clarifying;
2) raw material metering: silicon micropowder is precisely weighed from a weighing bin (2) and then injected into a high-stirring modifying machine (1), a silane coupling agent KH-560 is accurately metered and injected into the high-stirring modifying machine (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 micropowder;
3) modification: the control temperature of the high-stirring modifier is between 120 ℃ and 130 ℃, and the silicon micropowder and the silane coupling agent KH-560 are adsorbed in the cavity of the modifier (1) for 50-70 minutes under the high-dispersion and high-speed mixing motion to complete the coating process;
4) material conveying: the modified silicon micropowder falls into a collecting hopper (5), is connected with a first emulsifying tank (6), is subjected to gas-solid separation by a pulse dust collector (7) and is conveyed to a buffer hopper (9);
5) filtering: the modified material enters an FL vertical classifier (11) through a second emulsification tank (10), agglomerated particles are filtered by centrifugal force generated by a vertical classifier impeller (202) rotating at high speed, and the particles are uniformly distributed by depolymerization through a high-efficiency air screen (207);
6) collecting: the fine particle materials enter a fine material discharging part (201) through centrifugal force generated by an impeller (202) of the vertical classifier, then enter a cyclone collector (12) for further gas-solid separation, and the dust-containing gas in the cyclone collector (12) enters a bag type dust filter (13) for further gas-solid separation because the fine particle materials are discharged from the lower part and are the majority of products.
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