CN109052408A - Continuous smelting method and equipment for diamond wire cutting silicon powder - Google Patents
Continuous smelting method and equipment for diamond wire cutting silicon powder Download PDFInfo
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- CN109052408A CN109052408A CN201811205680.5A CN201811205680A CN109052408A CN 109052408 A CN109052408 A CN 109052408A CN 201811205680 A CN201811205680 A CN 201811205680A CN 109052408 A CN109052408 A CN 109052408A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000003723 Smelting Methods 0.000 title claims abstract description 52
- 239000011863 silicon-based powder Substances 0.000 title claims abstract description 51
- 238000005520 cutting process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910003460 diamond Inorganic materials 0.000 title claims abstract 10
- 239000010432 diamond Substances 0.000 title claims abstract 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000006698 induction Effects 0.000 claims abstract description 22
- 239000002699 waste material Substances 0.000 claims abstract description 20
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 37
- 239000010703 silicon Substances 0.000 claims description 37
- 238000002844 melting Methods 0.000 claims description 28
- 230000008018 melting Effects 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 28
- 238000006243 chemical reaction Methods 0.000 abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000000377 silicon dioxide Substances 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005429 filling process Methods 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 description 12
- 238000007499 fusion processing Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000002146 bilateral effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000004484 Briquette Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 229910003978 SiClx Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000004523 agglutinating effect Effects 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
- 239000011230 binding agent Substances 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000013632 homeostatic process Effects 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- -1 smelting furnace Chemical compound 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
-
- 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
- C01B33/02—Silicon
- C01B33/037—Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention relates to a metallurgical smelting technology, in particular to a method and equipment for recovering and smelting silicon powder waste. The continuous smelting method for the diamond wire-electrode cutting silicon powder adopts a direct current arc smelting technology, improves the temperature of a main reaction zone by introducing argon, is beneficial to full reaction of silicon dioxide and a reducing agent, can reduce oxidation of the silicon powder in the filling process, further improves the efficiency of the smelting process by a bottom induction discharging mode, and realizes continuous discharging. The invention also provides continuous smelting equipment for the diamond wire-electrode cutting silicon powder, which comprises a smelting furnace, electrodes and a power supply control system and has the advantages of reasonable structure, good purification effect, high smelting efficiency and the like.
Description
Technical field
The present invention relates to metallurgical smelting technologies, and in particular to a kind of recycling method of smelting of Buddha's warrior attendant wire cutting silicon powder waste material and
Equipment.
Background technique
The fossil energy contained in the earth is limited, and a large amount of combusts fossil energy will cause very serious environmental pollution,
Therefore the following people to can the demand of the raw energy can be increasing.Solar energy is as a kind of inexhaustible clear
The clean energy can play important role in the raw energy.Wherein solar photovoltaic industry development is swift and violent, has become complete
One of steady and fast-developing rising industry within the scope of ball.In recent years, crystal silicon solar batteries are always in solar battery
In remain 90% or more occupation rate of market, be undisputed mainstream technology, and will occupy within many decades leading
Status.Primary raw material of the silicon as solar battery, the fast development of photovoltaic industry will increase dramatically to solar-grade polysilicon
Demand, can achieve 400,000 tons by the end of the polycrystalline silicon raw material consumed every year at present, it is contemplated that in the year two thousand thirty whole world crystal silicon demand
Amount than is now doubled.
Crystal silicon solar batteries slice mainly uses Buddha's warrior attendant line cutting technology at present, due to that can generate joint-cutting loss, quality
Nearly half high-purity silicon powder and cutting additive and coated metal impurity blend together into cutting waste material.Currently, cutting waste material master
It is used for the deoxidier of smelting iron and steel, also there is the smelting for alloy.But due to effect be not it is highly desirable, it is big there is no realizing
Sizable application.Due to the quantity cumulative year after year of cutting waste material, and purposes exploitation is less, and price declines from 1100 yuan/ton before
To current 700 yuan/ton.From the perspective of crystal silicon solar batteries industry entirety, growing cutting waste material is made again
Solar energy level silicon is caused, realizes that large-scale application is of great significance to for reducing solar battery totle drilling cost.
For metallurgy method, solution Buddha's warrior attendant wire cutting silicon powder scrap recovery considerations, which have altogether, can be divided into three steps: the first step is
The pre-treatment of silicon powder waste material, second be silicon powder waste material melting, third portion is the purification of metalluragical silicon.Not with cutting technique
Disconnected to improve, the impurity content in silicon powder waste material can be fewer and fewer, therefore it is super to solve the problems, such as that the key of silicon powder recycling seeks to solve
The melting problem of fine powder.Wherein, the purity of the yield in fusion process and product is to determine recycling silicon potential value
Key factor.
According to investigations, industrially attempted directly to carry out silicon powder waste material induction melting, but due to Buddha's warrior attendant wire cutting silicon powder compared with
Carefully, generally less than 0.5 micron, induction melting temperature is lower in addition, and superfine silica powder is easily with carbon atmosphere etc. during melting
Irreversible chemical reaction occurs, therefore general yield is no more than 70%.Wherein there are one very important the disadvantage is that silicon powder
Filling rate it is very low, since silicon powder surface is attached with organic additive, the silicon powder after drying is more fluffy, and stacking density is general
For 0.3 g/cm3, actual charging efficiency is no more than 10%.In view of the consumption of crucible, this mode economic feasibility is poor, because
There is no expanded for this.Another way is slag making melting, and disadvantage is still that yield is lower, due to the oxygen during filler
Change problem, yield is general less than 60%, and can introduce a large amount of slag agent impurity.Currently, it is useless to be directed to Buddha's warrior attendant wire cutting silicon powder
The recycling research of material is less.The document delivered includes: hot plasma melting, induction melting, ball milling into nano particle system
Directly prepare solar battery, bromine hydrogenation and aerosol reaction etc..The application and offer of silicon powder have been widened in these researchs of forefathers
Necessary theory support, but be not dedicated to fundamentally solving the practical problem of current silicon powder waste recovery.
Summary of the invention
To solve problems of the prior art, the present invention provides a kind of continuous smelting sides of Buddha's warrior attendant wire cutting silicon powder
Method cooperates bottom induction discharging and argon gas protection using electric arc melting mode, effectively increases the yield and melting effect of silicon
Rate reduces the impurity in silicon.In addition, having the present invention also provides a kind of continuous smelting equipment of Buddha's warrior attendant wire cutting silicon powder
Structurally reasonable, the advantages that refining effect is good, smelting efficiency is high.
To achieve the above object, the technical solution adopted by the present invention are as follows: propose a kind of the continuous of Buddha's warrior attendant wire cutting silicon powder
Method of smelting, comprising the following steps:
Step 1: filling up silico briquette in the discharging runner of bottom of furnace body, fire grate is then covered, by hollow negative electrode to furnace body
Inside is continually fed into argon gas, starts electric arc melting system power supply control system, is preheated using low-power to furnace body, Zhi Daojia
Thermocurrent tends towards stability；
Step 2: normal power needed for improving the output power to melting of electric arc melting system, passes through pair being arranged on bell
Claim feed opening that the bulk silicon powder waste material for having configured reducing agent is added into furnace body；Need to guarantee holding for argon gas in entire fusion process
It is continuous to be passed through, while negative electrode gos deep into and is stably inserted into silicon powder waste material, and heated current and voltage stabilization；
Step 3: when the intracorporal fusing silicon liquid rise upper critical height of furnace, to the induction coil being arranged on discharging runner
It is powered, induction heating is carried out to discharging runner, when reactor effluent stream channel temp reaches the fusing point of silicon, the silicon that loads in the runner that will discharge
Block fusing, the intracorporal silicon liquid of furnace is flowed into the rewinding container being pre-placed by discharging runner, under silicon liquid drops in furnace body
When portion's critical altitude, stop being powered to induction coil, reactor effluent stream channel temp reduces, and the voluntarily condensation of silicon liquid will discharging runner envelope
Extremely；
Step 4: repeating second and third described step, the continuous smelting of silicon powder is realized.
The discharging runner is the v-shaped structure of upper-wide and lower-narrow type, and the tilt angle of v-shaped structure is 3 ° -8 °.
The electric arc melting system use direct current supply, and positive electrode and negative electrode be all made of Bilateral Symmetry disengaging connect electricity
Mode.
A kind of continuous smelting equipment of Buddha's warrior attendant wire cutting silicon powder, including smelting furnace, electrode and electric power supply control system, it is described molten
Furnace includes bell, furnace body and the discharge system that bottom of furnace body is arranged in, and is provided with feed opening, observation window and furnace on the bell
Interior smoke outlet, the bell are closed together at the top of the furnace body, and the discharge system includes porous fire grate, discharging runner and sense
Heating coil is answered, the porous fire grate is arranged in the top of discharging runner, is wound with the induction heating on the discharging runner
Coil；The electrode includes positive electrode and negative electrode, and the positive electrode is arranged in the furnace body close to bottom position, described
Negative electricity extremely hollow electrode, negative electrode are mounted on bell and extend in furnace body；The electric power supply control system includes successively connecting
Power supply, transformer and the rectifier connect, the rectifier output negative pole pass through the short net of cathode and transmission system and the negative electrode
Electrical connection, the negative electrode are connect with electrode automatic lifting system, and the rectifier output cathode passes through just extremely short net and electrode
Communication apparatus is electrically connected with the positive electrode.
The discharging runner is the v-shaped structure of upper-wide and lower-narrow type, and the tilt angle of v-shaped structure is 3 ° -8 °.
It is provided with water cooling on the bell and tightly plugs with molten metal circle.
The bell is closed together at the top of the furnace body using sand seal.
Water cooled furnace body is provided on the furnace body outer wall.
It is put forward for the first time in method of smelting of the invention with the method for direct-current arc melting and solves current silicon powder waste material melting
The critical issue of effect difference.Electric arc melting is (theoretical much larger than reaction temperature required for silicon powder waste material due to its smelting temperature height
> 1800 DEG C), and under conditions of argon gas protection, the temperature of main reaction region can further increase, and more have compared to conventional arc melting
It is sufficiently reacted conducive to silica with reducing agent, argon gas is continually fed into entire fusion process, and electrode can be effectively prevented
The oxidation of oxidation and silicon powder during filler in warm, to reduce reducing agent proportion save the cost；Pass through conjunction
The redox equilibrium and continuous production technology of the control reaction process of reason, theoretically the yield of silicon is greater than 90%, in conjunction with
The mode of bottom induction discharging, can be further improved the efficiency of fusion process；Meanwhile using the method for smelting discharging time
Short, binder furnace body covers and argon gas protection technique, and the content of the oxygen in silicon, nitrogen and field trash can be made to be reduced, had
Conducive to obtaining more high-grade silicon materials.
Smelting equipment of the invention uses electric arc melting mode, since the loss of direct-current arc cathode is only alternating current arc
30%-50%, scintillation effect only have the 50%-70% exchanged, and arc-covering slag operation noise is lower, and natural power factor is up to 0.94-0.96,
Electrode centers temperature high heat is concentrated, and deep buried electrode is easy to, and furnace bottom is not easy to go up, and it is higher melting-point to be particularly suitable for silicon powder waste material etc.
Product is smelted.Therefore the power supply system of this set electric arc melting device uses direct current, and connects electric mode by what Bilateral Symmetry passed in and out
(that is: the positive grade of rectifier output or cathode is all made of a conducting wire and is divided into two-way, two-way is symmetrically then connected to positive electrode
Or the two sides of negative electrode) carry out inclined arc phenomenon of the effective solution direct-current arc in fusion process, argon gas is led to by hollow electrode
Method come improve smelting efficiency and reduce silicon powder oxidation, be conducive to obtain more high-grade silicon materials；The smelting equipment bell
Flue gas is avoided to reveal using sand seal between furnace body；The smelting equipment incudes continuous discharge system using bottom, since silicon is solidifying
Gu during, volume can be expanded, therefore the runner that discharges is designed to down that narrow wide structure, tilt angle are 3 ° -8 °, material path
Length be subject to silicon liquid and can voluntarily solidify sealing, the design of discharging material path part has load coil, can be at any time to material
Road is heated, and realizes continuous blowing function；Simultaneously because the area of water cooled furnace body can increase to 90% using bottom discharge
Left and right is conducive to expand furnace melting and reduces the consumption of refractory material.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of smelting equipment of the present invention；
Fig. 2 is the working state schematic representation of smelting equipment of the present invention；
In figure:380V power supply,Transformer,Rectifier,Just extremely short net,Negative electrode,Ar gas passage,It is defeated
Electric system and electrode automatic lifting control system,The short net of cathode,Smoke outlet in furnace,First feed opening,Second adds
Material mouth,Observation window,Bell,Sand sealing device,The area Si Liao,Cryogenic reaction zone,High temperature reaction zone,Furnace charge
Preheating zone,Water cooling tightly plugs with molten metal circle,Low temperature insulation,High-temperature refractory,Water cooled furnace body,Positive electrode,Furnace
Grate,Coil protects mud,Electrode communication apparatus,Induction coil,Discharge runner,Silicon liquid.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Embodiment one:
A kind of continuous smelting method of Buddha's warrior attendant wire cutting silicon powder, comprising the following steps:
Step 1: filling up silico briquette in the discharging runner 28 of bottom of furnace body, fire grate 24 is then covered, passes through hollow negative electrode 5
After being continually fed into argon gas to furnace interior, start electric arc melting system power supply control system, furnace body is carried out using low-power pre-
Heat, until heated current tends towards stability；
Step 2: normal power needed for improving the output power to melting of electric arc melting system, by being arranged on bell 13
The bulk silicon powder waste material for having configured reducing agent is added into furnace body for first feed opening 10 and the second feed opening 11；Entire fusion process
Middle needs guarantee needs to guarantee being continually fed into for argon gas, while negative electrode 5 gos deep into and is stably inserted into silicon powder waste material, and adds
Thermocurrent and voltage stabilization, the electric arc sound is droning and stablize in furnace.Moment pays close attention to the state of furnace charge, and furnace charge is made to guarantee have well
Gas permeability, charge level it is loose and have certain agglutinating property；
Step 3: when the intracorporal fusing silicon liquid rise upper critical height of furnace, to the line of induction being arranged on discharging runner 28
Circle 27 is powered, and carries out induction heating to discharging runner 28, will be in discharging runner when 28 temperature of runner that discharges reaches the fusing point of silicon
The silico briquette of filling melts, and the intracorporal silicon liquid 29 of furnace is flowed into the rewinding container being pre-placed by discharging runner, when silicon in furnace body
When liquid drops to lower critical height, stop being powered to induction coil 27, discharging 28 temperature of runner reduces, the voluntarily condensation of silicon liquid
Discharging runner is shut；
Step 4: repeating second and third described step, the continuous smelting of silicon powder is realized.
Electric arc melting system in above-mentioned method of smelting uses direct current supply, and positive electrode and negative electrode are all made of bilateral pair
Claim disengaging connects electric mode, helps to improve inclined arc phenomenon of the direct-current arc in fusion process.
Embodiment two:
A kind of continuous smelting equipment of Buddha's warrior attendant wire cutting silicon powder as shown in Figure 1, including smelting furnace, electrode and power supply control system
System.
Smelting furnace includes bell 13, furnace body and the discharge system that bottom of furnace body is arranged in, and first is provided on bell 13 and is added
Material mouth 10, the second feed opening 11, two feed openings are symmetrical arranged, and smoke outlet 9 in observation window 12 and furnace is additionally provided on bell 13,
Bell 13 is closed together at the top of furnace body, sand sealing device 14 is provided between bell and furnace body, flue gas is avoided to reveal, set on bell
It is equipped with water cooling and tightly plugs with molten metal circle 19.Oven body part is built in the part close to bottom positive electrode 23 using high-temperature refractory 21, external
The masonry of low temperature insulation 20 can be used since temperature is lower, refractory material requires have good compactness, sets on furnace body outer wall
It is equipped with water cooled furnace body 22, furnace shell delays the service life of furnace insulation using water cooling.Discharge system includes porous fire grate 24, discharging
The top of discharging runner 28 is arranged in runner 28 and induction coil 27, porous fire grate 24, and discharging runner is the V-arrangement of upper-wide and lower-narrow type
Structure, the tilt angle of v-shaped structure are 3 ° -8 °, and the length of discharging runner 28, which is subject to silicon liquid, can voluntarily solidify sealing, out
It is wound with induction coil 27 on stream road 28, coil protection mud 25 is covered with outside induction coil 27.To setting reactor effluent stream road 28
It is powered in induction coil, discharging runner 28 can be heated at any time, realize continuous blowing function.
Electrode includes positive electrode 23 and negative electrode 5, and positive electrode 23 is arranged in furnace body close to bottom position, negative electrode 5
It is mounted on bell 13 and extends in furnace body, negative electrode 5 is hollow electrode, and the argon gas in through furnace is offered in the middle part of electric grade
Channel 6.
Electric power supply control system includes sequentially connected 380V power supply 1, transformer 2 and rectifier 3,3 output negative pole of rectifier
It is electrically connected by the short net 8 of cathode and transmission system with negative electrode 5, negative electrode 5 is connect with electrode automatic lifting system, rectifier 3
Output cathode is connected to bottom of furnace body by just extremely short net 4 and electrode communication apparatus 26, and is electrically connected with positive electrode 23.By whole
Stream device 3 converts alternating current to direct current as electric arc furnaces power supply, and positive electrode and negative electrode are all made of connecing for Bilateral Symmetry disengaging
Electric mode, the i.e. output cathode of rectifier 3 and output negative pole are all made of a conducting wire and are divided into two-way, then respectively symmetrically by two-way
Ground is connected to the two sides of positive electrode 23 or negative electrode 5, this, which connects electric mode, can be effectively improved inclined arc of the direct-current arc in fusion process
Phenomenon.
When smelting equipment in the present embodiment works, as shown in Fig. 2, the furnace charge in furnace should normally divide according to temperature difference
For four big regions: the area Si Liao 15, charge preheating area 18, cryogenic reaction zone 16 and high temperature reaction zone 17.Wherein 15 temperature of the area Si Liao
It is minimum, it is not involved in entire fusion process substantially, is mainly distributed on close to thermal insulation material side, plays main reaction region in isolation furnace
Effect avoids polluting brought by thermal insulation material and plays certain heat-blocking action.Charge preheating area 18 is mainly distributed on the bed of material
Top, with being carried out continuously for melting, which can constantly sink, and temperature gradually rises and is transitioned into low-temp reaction
Area, the process are a homeostasis processes, maintain balance and stability by continuous filler.Carbon mainly occurs for cryogenic reaction zone 16
With reacting for silicon monoxide and silica, a certain proportion of silicon carbide is generated, and since the regional temperature is higher, a part of silicon
Powder can preferentially melt, and form the droplet of a large amount of silicon and be evenly dispersed in the bed of material, therefore the layered material face has certain burning
Knot property and charge level is fluffy has good gas permeability.The temperature highest of high temperature reaction zone 17, it is main with silica and carbon
The reaction of SiClx and a large amount of thawings of silicon powder theoretically match and provide sufficiently high reaction by using suitable reducing agent
The furnace charge of temperature, addition can be completely converted into liquid-state silicon.Remove the area Si Liao furnace charge, the yield of silicon can achieve 90% with
On.
Claims (8)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119370851A (en) * | 2024-10-28 | 2025-01-28 | 青岛阿莫斯资源科技有限公司 | A method and device for producing high-purity quartz sand by liquid phase discharge method |
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| CN209178002U (en) * | 2018-10-17 | 2019-07-30 | 大连颐和顺新材料科技有限公司 | Continuous smelting equipment for diamond wire-electrode cutting silicon powder |
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| CN119370851A (en) * | 2024-10-28 | 2025-01-28 | 青岛阿莫斯资源科技有限公司 | A method and device for producing high-purity quartz sand by liquid phase discharge method |
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