CN103183324A - Unit for preparing silicon nitride product by silica powder recovered from crystalline silicon processed waste mortar - Google Patents
Unit for preparing silicon nitride product by silica powder recovered from crystalline silicon processed waste mortar Download PDFInfo
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- CN103183324A CN103183324A CN2013100241342A CN201310024134A CN103183324A CN 103183324 A CN103183324 A CN 103183324A CN 2013100241342 A CN2013100241342 A CN 2013100241342A CN 201310024134 A CN201310024134 A CN 201310024134A CN 103183324 A CN103183324 A CN 103183324A
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- silicon nitride
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- nitrogen
- silica flour
- waste mortar
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 52
- 229910052581 Si3N4 Inorganic materials 0.000 title claims abstract description 49
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910021419 crystalline silicon Inorganic materials 0.000 title claims abstract description 35
- 239000002699 waste material Substances 0.000 title claims abstract description 35
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 34
- 239000000843 powder Substances 0.000 title claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 86
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 40
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 235000013312 flour Nutrition 0.000 claims description 46
- 238000006243 chemical reaction Methods 0.000 claims description 31
- 238000012545 processing Methods 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 9
- 238000012856 packing Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000011863 silicon-based powder Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 238000003860 storage Methods 0.000 abstract description 4
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 17
- -1 Silicon imide Chemical class 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000006227 byproduct Substances 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 238000010574 gas phase reaction Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 229910052572 stoneware Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Images
Abstract
A unit for preparing a silicon nitride product by silica powder recovered from crystalline silicon processed waste mortar comprises an entrained-flow reactor 1, a nitrogen plasma igniter 13, a pressure controller 2, a tunnel kiln 3, a kiln car 4, a dryer 5, a silica powder storage bin 6, a silica powder pneumatic conveyer 7, an Si3N4 pneumatic conveyer 8, an Si3N4 storage bin 9, a product measurement packaging device 10, an air-separation nitrogen-making device 11, an automatic control system 12, and related pipelines, valves and instruments, wherein the entrained-flow reactor 1, the pressure controller 2, the tunnel kiln 3 and the kiln car 4 are core or key equipment of the unit, and others are equipment capable of being matched with mature technologies in the market; and the silica powder and nitrogen recovered by the crystalline silicon processed waste mortar are taken as the raw materials, and the nitrogen is taken as the raw material and a heat transfer carrier to produce a silicon carbide ceramic material combining silicon nitride micro powder and silicon nitride.
Description
Technical field
The present invention relates to a kind ofly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, belong to solar-energy photo-voltaic cell crystalline silicon processing waste comprehensive utilization field.
Background technology
Silicon nitride is a kind of advanced person's engineering ceramic material, have high room temperature and hot strength, high rigidity, resistance to abrasion, oxidation-resistance and good heat shock resistance and mechanical shock performance, thought high comprehensive performance in the structural ceramics field, be hopeful to substitute nickel-base alloy obtains widespread use in high-tech, high temperature field a kind of novel material most by material supply section educational circles.
The beta-silicon nitride powder synthesis technique is generally:
The direct nitrogenize 3Si+2N of silica flour
2=Si
3N
4
Silicon imide gas-phase reaction 3SiCl
4+ 4NH
3=Si
3N
4+ 12HCl
Carbothermal reduction-nitridation 3SiO
2+ 6C+2N2=Si
3N
4+ 6CO
Wherein the direct nitrogenize of silica flour is the technology that the preparation beta-silicon nitride powder develops the earliest, also is a kind of method that is most widely used at present, and this method is relatively simple, low price uses raw material to be crystalline silicon, belongs to intermittenceization production, product is block, must just can obtain micro mist through ball milling; The silicon imide gas-phase reaction needs special initial feed, and expensive, reaction process produces a large amount of hydrogenchloride, and equipment is had particular requirement, manufacturing cost height, but product purity height, fine size and even; Carbothermal reduction-nitridation reaction process, raw material are easy to get, the energy consumption height, pollute heavy, the apparatus and process complexity;
Crystalline silicon processing waste mortar be form in the solar-energy photo-voltaic cell process of manufacture be mixed with 40～50%PEG (polyoxyethylene glycol cutting liquid), 45～30%SiC (cutting abrasive material), 1～3% iron powder (line of cut wearing and tearing), the quaternary mixture of 14～17%Si powder (crystalline silicon abrasive dust) is.
The applicant paid close attention to the handling problem of solar-energy photo-voltaic cell crystalline silicon processing waste mortar, the optimized recovery and utilization technology of exploratory development since 2006.The application for a patent for invention of application number 201110101064.7 " photovoltaic cell crystalline silicon processing waste mortar comprehensive treating process novel method " was proposed on April 22nd, 2011, proposed the application for a patent for invention of application number 201110238197.9 " photovoltaic crystalline silicon processing waste mortar comprehensive treatment technique " on 08 12nd, 2011, carried out replenishing perfect to previous patent application.On June 26th, 2012 again application number 201110238197.9 " photovoltaic crystalline silicon processing waste mortar comprehensive treatment technique " for right of priority proposed application number be 201210207989.4 " crystalline silicon of no sewage and solid waste discharging is processed the waste mortar comprehensive treatment techniques " proposed with contain SiC, Si binary sand is raw material, utilizes the air flow bed nitrogenize to synthesize the technical scheme of nano-silicon nitride; Afterwards the suitability for industrialized production technology of this scheme is furtherd investigate, invention has designed " utilizing crystalline silicon processing waste mortar to reclaim the unit that silica flour prepares silicon nitride product "
Summary of the invention
The present invention is on the basis of silicon nitride production technique systems such as the direct nitrogenize of synthetic study silicon nitride silica flour, silicon imide gas-phase reaction, to replenishing with perfect of the synthetic nitride process of air flow bed nitrogenize of the application for a patent for invention of application number 201210207989.4 " the crystalline silicon processing waste mortar comprehensive treatment technique of no sewage and solid waste discharging ".
The purpose of this invention is to provide a kind of advantage that combines the direct nitrogenize of silica flour and two Technologies of silicon imide gas-phase reaction, eliminated simultaneously they separately defective reclaim the unit that silica flour is made the feedstock production silicon nitride product with crystalline silicon processing waste mortar.
The object of the present invention is achieved like this: produce unit by air flow bed reactor, nitrogen gas plasma lighter for ignition, pressure controller, tunnel furnace, kiln car, drying machine, silica flour feed bin, silica flour air conveyor, Si
3N
4Air conveyor, Si
3N
4Feed bin, ganging of products packing plant, nitrogen-making device, robot control system(RCS) and relevant ducts, valve, instrument constitute; The silica flour and the nitrogen that reclaim with crystalline silicon processing waste mortar are raw material, are delivery vehicles with nitrogen, produce silicon nitride powder and silicon nitride combined silicon carbide stupalith.
Raw material for the production of silicon nitride powder is the silicon powder that utilizes crystalline silicon processing waste mortar to reclaim, and its composition is Si 〉=80-95%, SiC≤20-5%, Fe
2O
3≤ 0.1%.
Raw material for the production of silicon nitride powder is to contain N
298～99.99% nitrogen, output pressure 0.1～1.0MPa, the throughput of supporting nitrogen-making device is 2～8 times of actual nitrogenize consumption, to satisfy unit raw material and heat delivery needs.
Silicon nitride powder synthetic is to finish in nucleus equipment-air flow bed reactor at unit; Air flow bed operating pressure 0.1～1.6MPa, aspect ratio 3～10: 1.
Raw material for the manufacture of silicon nitride combined silicon carbide stupalith blank is the binary sand that crystalline silicon processing waste mortar reclaims, and the tool composition is Si=40--20%, SiC=60--80%, Fe
2O
3≤ 0.1%.
Provide for the production of the reaction nitrogen that the energy of silicon nitride combined silicon carbide stupalith sintering and nitrogen are that the air flow bed reactor is discharged, temperature 1200--1600 ℃, pressure 0.01--0.10MPa contain a small amount of silicon nitride powder.
The reaction sintering of silicon nitride combined silicon carbide stupalith is to finish in the key equipment-tunnel furnace of this unit; Tunnel furnace operating pressure≤0.1MPa, working sections is long-pending be the air flow bed sectional area 0.5--4 doubly, length be air flow bed height 5--20 doubly; Be combined to form the tunnel like sintered channels with supporting kiln car.(separate case application)
The nitrogen transmitting device that connects air flow bed reactor and tunnel furnace is pressure controller, its front end is equipped with according to the air flow bed reactor process requirement and carries out pressure controlled automatically controlled valve, the rear end is provided with the air distributor with tunnel kiln sintering technology coupling, the pressure controller shell is metal shell, and liner can bear 1200--1600 ℃ lagging material.
Except said flow bed bioreactor, tunnel furnace, kiln car, the necessary specialized designs manufacturing of pressure controller, all the other comprise nitrogen gas plasma lighter for ignition, drying machine, silica flour feed bin, silica flour air conveyor, Si
3N
4Air conveyor, Si
3N
4Feed bin, ganging of products packing plant, nitrogen-making device, robot control system(RCS) and relevant ducts, valve, instrument all can select for use the market-ripe Device element supporting according to the unit designed capacity.
Now in conjunction with the accompanying drawings and embodiments the present invention is further specified.
Description of drawings
Ordering-the figure reclaims silica flour with crystalline silicon processing waste mortar to prepare silicon nitride product unit layout diagram.
Arrow represents to connect the pipeline of production line relevant device among the figure, the material of carrying in the character representation pipeline of its top, and arrow is represented the material traffic direction, is equipped with corresponding by-pass valve control on the pipeline; Circle is illustrated in the instrument of installing on the production line, and P is that pressure detection instrument, TT are temperature instrument, and what be connected with two dot chain line with robot control system(RCS) 11 is teletransmission control detecting instrument, no line be on-the-spot installation instrument; Figure number 1 is this unit nucleus equipment---air flow bed reactor (separate case application), 2 is that pressure controller, 3 is the unit key equipment---, and tunnel furnace (separate case application), 4 is that the supporting kiln car of tunnel furnace (separate case application), 5 is that silica powder drying machine, 6 is that silica flour feed bin, 7 is that silica flour air conveyor, 8 is Si
3N
4Air conveyor, 9 is Si
3N
4Feed bin, 10 ganging of products packing plants, 11 are that nitrogen-making device, 12 is that robot control system(RCS), 13 is that plasma igniter, 14 pressure controllers control flashboard, 15 are the silicon nitride combined silicon carbide ceramic component of tunnel kiln sintering under meter, 16.
Embodiment
Below be specific embodiments of the invention, but method of the present invention and not exclusively being limited, the those skilled in the art can be as required changes or omits wherein step.
Embodiment 1:
Shown in the unit layout diagram for preparing silicon nitride product with crystalline silicon processing waste mortar recovery silica flour: nitrogen-making device 11 is nitrogen output 2000Nm processed
3/ h, purity N
299.9%, the making nitrogen by pressure swing adsorption device of output pressure 0.6MPa, the nitrogen of producing is regulated flow through under meter 15, enter silica flour air conveyor 7, contain Si84%, SiC16% silica flour to what be stored in silica flour feed bin 6 by 1: 1 ratio of mixture of gas-solid mass ratio with the speed of 1t/h, in the spray people reaction gas flow bed bioreactor 1, by nitrogen gas plasma 13 igniting, trigger the N in the reactor
2, Si, SiC form from spreading the nitrogenize building-up reactions, reaction is according to 3SiC+2N
2=Si
3N
4+ 3C+62000KJ and 3Si+2N
2=Si
3N
4Two nitrogenizing reaction equations of+751570KJ carry out, and exothermic heat of reaction can reach 2220kw, can make temperature of reaction reach 2680 ℃; For working temperature in the control air flow bed reactor is being reacted 1300--1450 ℃ of optimum operating condition, react required 2～8 times nitrogen along reactor wall side direction spray people, in reactor 1, form eddy flow, protect air flow bed reactor 1, guarantee the complete reaction of Si, SiC simultaneously; Synthetic Si
3N
4Accumulate in the reactor bottom water cooler, be cooled to 600～800 ℃; With pressurized air with 1: 50 ratio of mixture of gas-solid mass ratio by Si
3N
4Air conveyor 8 is transported in the product feed bin 9, utilizes airborne oxygen simultaneously, and with the carbon reaction of SiC nitrogenize by-product, C is taken off in gasification, by ganging of products packing plant 10 metering packings, puts in storage for sale; Reaction residue nitrogen carries energy and a small amount of reaction product process pressure controller 2 of 500--700kw with 1300--1450 ℃ high temperature, by regulating the keying amplitude adjusted air flow bed reactor pressure of pressure-controlling flashboard 14, enter in the tunnel furnace 3, utilize high temperature N
2Finish the nitrogenizing reaction sintering that is contained in the three-dimensional foam strainer of using SiC, the preparation of Si binary sand on the kiln car 4 in the tunnel furnace, and utilize the remaining nitrogen of nitrogen-making device to cool at the tunnel furnace cooling section, form silicon nitride combined silicon carbide three-dimensional foam porcelain filter 16; The waste gas that tunnel furnace is discharged is temperature at 300～600 ℃ nitrogen, enter silica flour filtration cakes torrefaction machine 5 by pipeline, be used for dry silica flour filter cake from the waste mortar treatment system, dried silica flour enters silica flour feed bin 6, isolates nitrogen and water vapour emptying and discharges.
Nitrogen production by air separation device 11 preparation contain N
2Nitrogen more than 99.9% is the important factor of keeping the normal operation of unit, bearing provides reactive material, carry reaction raw materials, derive multitasks such as heat of reaction, dry reaction raw material, this unit adopts the making nitrogen by pressure swing adsorption device, and the nitrogen power consumption is low, and start-up period is short, the level of automation height can be realized unmanned; Self-con-tained unit 12 is responsible for the automatization control and operation of whole production line production, safety.
Embodiment 2:
Shown in the unit layout diagram for preparing silicon nitride product with crystalline silicon processing waste mortar recovery silica flour: nitrogen-making device 11 is nitrogen output 3000Nm processed
3/ h, purity N
299.5%, the compression air separation facility of pressure 0.6MPa is being produced 3000Nm
3Can the nearly 800Nm of by-product in the time of/h nitrogen
3/ h oxygen is used for export trade, can eat up part of part nitrogen cost processed; The passing nitrogen of producing is regulated flow through under meter 15, advance silica flour air conveyor 7, be stored in the dried Si92% of containing, the SiC8% silica flour of silica flour feed bin 6 with the speed handle of 1.51t/h by 1: 1 ratio of mixture of gas-solid mass ratio, in the spray people air flow bed reactor 1, by nitrogen gas plasma 13 igniting, N2, the Si, the SiC that trigger in the reactor form the nitrogenize building-up reactions, according to 3SiC+2N
2=Si
3N
4+ 3C+62000KJ and 3Si+2N
2=Si
3N
4Two nitrogenizing reaction equations of+751570KJ form from spreading thermopositive reaction, exothermic heat of reaction can reach 3450kw, temperature of reaction is reached about 2680 ℃, for working temperature in the control air flow bed reactor is being reacted 1300--1450 ℃ of optimum operating condition, react required 3～5 times nitrogen along reactor wall side direction spray people, in reactor, form eddy flow, protect air flow bed reactor 1, guarantee the complete reaction of Si, SiC simultaneously; The Si that reaction is synthetic
3N
4Be deposited in the reactor bottom water cooler, being cooled to 600～800 ℃ is transported in the product feed bin 9 through product air conveyor 8 with 1: 30 ratio of mixture of gas-solid mass ratio with pressurized air, utilize oxygen and the reaction of SiC nitrogenize by-product carbon in the pressurized air, C is taken off in gasification, by ganging of products packing plant 10 metering packings, put in storage for sale; Reaction residue nitrogen carries the energy and a small amount of reaction product process pressure controller 2 of 800--1000kw with 1300--1450 ℃ temperature, regulate pressure-controlling flashboard 14 to regulate the air flow bed reactor pressure, enters in the tunnel furnace 3, utilizes high temperature N
2Finish the nitrogenizing reaction sintering that is contained in the three-dimensional foam chemical stoneware filler of using SiC, the preparation of Si binary sand on the kiln car 4 in the tunnel furnace, form silicon nitride combined silicon carbide three-dimensional foam chemical stoneware filler 16; The waste gas that tunnel furnace is discharged is temperature at 300～600 ℃ nitrogen, enters silica flour filtration cakes torrefaction machine 5 by pipeline, dry silica flour filter cake from the waste mortar treatment system, and dried silica flour enters silica flour feed bin 6, isolates nitrogen and water vapour emptying and discharges.
The nitrogen of nitrogen production by air separation device 11 preparations is important factors of keeping the normal operation of unit, bearing provides reactive material, carry reaction raw materials, derive heat of reaction, multitasks such as dry reaction raw material, this unit adopts the compression air separation facility to produce nitrogen, can by-product high-purity oxygen supply the market, comprehensive power consumption is low, and under the commercioganic condition of oxygen, its comprehensive cost is lower than making nitrogen by pressure swing adsorption; Need Attended mode; Self-con-tained unit 12 is responsible for the automatization control and operation of whole production line production, safety.
Claims (9)
1. reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: produce unit by air flow bed reactor, nitrogen gas plasma lighter for ignition, pressure controller, tunnel furnace, kiln car, drying machine, silica flour feed bin, silica flour air conveyor, Si
3N
4Air conveyor, Si
3N
4Feed bin, ganging of products packing plant, nitrogen production by air separation device, robot control system(RCS) and relevant ducts, valve, instrument constitute; The silica flour and the nitrogen that reclaim with crystalline silicon processing waste mortar are raw material, with the nitrogen delivery vehicles, produce silicon nitride powder and silicon nitride combined silicon carbide stupalith.
2. according to claim 1ly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: the raw material for the production of silicon nitride powder is the silicon powder that utilizes crystalline silicon processing waste mortar to reclaim, and its composition is Si 〉=80--95%, SiC≤20--5%, Fe
2O
3≤ 0.1%.
3. according to claim 1ly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: the raw material for the production of silicon nitride powder is to contain N
2The nitrogen of 98--99.99%, output pressure 0.1--1.0MPa, the throughput of supporting nitrogen gas generating system is 2--8 times of actual nitrogenize consumption, to satisfy unit raw material and heat delivery needs.
4. according to claim 1ly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: silicon nitride powder synthetic is to finish in nucleus equipment-air flow bed reactor at unit; Air flow bed operating pressure 0.2--1.6MPa, aspect ratio 3--10: 1.(separate case application)
5. according to claim 1ly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: the raw material for the manufacture of silicon nitride combined silicon carbide stupalith blank is the binary sand that crystalline silicon processing waste mortar reclaims, and its composition is Si=40--20%, SiC=60--80%, Fe
2O
3≤ 0.1%.
6. according to claim 1ly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: provide for the production of the reaction nitrogen that the energy of silicon nitride combined silicon carbide stupalith sintering and nitrogen are that the air flow bed reactor is discharged, temperature 1200--1600 ℃, pressure 0.01--0.10MPa contain a small amount of silicon nitride powder.
7. according to claim 1ly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: the reaction sintering of silicon nitride combined silicon carbide stupalith is to finish in the key equipment-tunnel furnace of this unit; Tunnel furnace operating pressure≤0.1MPa, working sections is long-pending be the air flow bed sectional area 0.5--4 doubly, length be air flow bed height 5--20 doubly; Be combined to form the tunnel like sintered channels with supporting kiln car.(separate case application)
8. according to claim 1ly reclaim the unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: the nitrogen transmitting device that connects air flow bed reactor and tunnel furnace is pressure controller, its front end is equipped with according to the air flow bed reactor process requirement and carries out pressure controlled automatically controlled valve, the rear end is provided with the air distributor with tunnel kiln sintering technology coupling, the pressure controller shell is metal shell, and liner can bear 1200--1600 ℃ lagging material.
9. according to claim 1ly reclaim the production unit that silica flour prepares silicon nitride product with crystalline silicon processing waste mortar, it is characterized in that: except said flow bed bioreactor, tunnel furnace, kiln car, the necessary specialized designs manufacturing of pressure controller, all the other comprise nitrogen gas plasma lighter for ignition, drying machine, silica flour feed bin, silica flour air conveyor, Si
3N
4Air conveyor, Si
3N
4Feed bin, ganging of products packing plant, nitrogen-making device, robot control system(RCS) and relevant ducts, valve, instrument all can select for use the market-ripe Device element supporting according to the unit designed capacity.
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|---|---|---|---|
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|---|---|---|---|
| CN201310024134.2A CN103183324B (en) | 2013-01-23 | 2013-01-23 | Unit for preparing silicon nitride product by silica powder recovered from crystalline silicon processed waste mortar |
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| CN103183324B CN103183324B (en) | 2014-12-31 |
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|---|---|---|---|---|
| CN103539459A (en) * | 2013-09-28 | 2014-01-29 | 南昌大学 | Method for preparing alpha-phase-rich silicon nitride-silicon carbide composite powder from recycled silicon wafer fret saw dust powder |
| CN103553647A (en) * | 2013-10-08 | 2014-02-05 | 常州工程职业技术学院 | Method for preparation of silicon nitride bonded silicon carbide refractory material by using silicon cutting waste mortar |
| CN110423118A (en) * | 2019-07-24 | 2019-11-08 | 洛阳市科创绿色建材研究院 | A kind of copper chute composite ceramics phase antiseep wear-resisting material produced with polycrystalline silicon wastes |
| CN113003549A (en) * | 2021-03-08 | 2021-06-22 | 昆明理工大学 | Fast preparation of beta-Si by gas-solid reaction3N4And method thereof |
| CN113003551A (en) * | 2021-03-19 | 2021-06-22 | 尹克胜 | New technology for synthesizing aluminum nitride powder by melting and atomizing aluminum ingot and production unit thereof |
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| CN200985280Y (en) * | 2006-12-07 | 2007-12-05 | 浙江大学 | Fluid-bed direct producing silicon nitride device |
| US20110212011A1 (en) * | 2008-09-16 | 2011-09-01 | Sunnyside Technologies, Inc. | Reactor and method for producing high-purity granular silicon |
| CN102787011A (en) * | 2011-08-12 | 2012-11-21 | 尹克胜 | Comprehensive treatment technology of waste mortar processing by crystalline silicon with no sewage and solid waste discharge |
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2013
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1792774A (en) * | 2005-12-07 | 2006-06-28 | 北京科技大学 | Process for ordinary pressure continuous synthesizing silicon nitride powder by fluidized bed tech. |
| CN200985280Y (en) * | 2006-12-07 | 2007-12-05 | 浙江大学 | Fluid-bed direct producing silicon nitride device |
| US20110212011A1 (en) * | 2008-09-16 | 2011-09-01 | Sunnyside Technologies, Inc. | Reactor and method for producing high-purity granular silicon |
| CN102787011A (en) * | 2011-08-12 | 2012-11-21 | 尹克胜 | Comprehensive treatment technology of waste mortar processing by crystalline silicon with no sewage and solid waste discharge |
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| CN103539459A (en) * | 2013-09-28 | 2014-01-29 | 南昌大学 | Method for preparing alpha-phase-rich silicon nitride-silicon carbide composite powder from recycled silicon wafer fret saw dust powder |
| CN103553647A (en) * | 2013-10-08 | 2014-02-05 | 常州工程职业技术学院 | Method for preparation of silicon nitride bonded silicon carbide refractory material by using silicon cutting waste mortar |
| CN103553647B (en) * | 2013-10-08 | 2015-06-17 | 常州工程职业技术学院 | Method for preparation of silicon nitride bonded silicon carbide refractory material by using silicon cutting waste mortar |
| CN110423118A (en) * | 2019-07-24 | 2019-11-08 | 洛阳市科创绿色建材研究院 | A kind of copper chute composite ceramics phase antiseep wear-resisting material produced with polycrystalline silicon wastes |
| CN113003549A (en) * | 2021-03-08 | 2021-06-22 | 昆明理工大学 | Fast preparation of beta-Si by gas-solid reaction3N4And method thereof |
| US11602725B2 (en) | 2021-03-08 | 2023-03-14 | Kunming University Of Science And Technology | Device for rapidly preparing beta-Si3N4 by gas-solid reaction, and method thereof |
| CN113003551A (en) * | 2021-03-19 | 2021-06-22 | 尹克胜 | New technology for synthesizing aluminum nitride powder by melting and atomizing aluminum ingot and production unit thereof |
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