CN110243177A - A kind of more monocrystalline silicon cutting slag method of smelting - Google Patents

A kind of more monocrystalline silicon cutting slag method of smelting Download PDF

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Publication number
CN110243177A
CN110243177A CN201910384800.0A CN201910384800A CN110243177A CN 110243177 A CN110243177 A CN 110243177A CN 201910384800 A CN201910384800 A CN 201910384800A CN 110243177 A CN110243177 A CN 110243177A
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CN
China
Prior art keywords
silicon
slag
smelting
graphite plate
monocrystalline silicon
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Pending
Application number
CN201910384800.0A
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Chinese (zh)
Inventor
羊实
庹开正
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Limited Co Of Development And Utilization Of Waste Residue In Yongping County Of Teda
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Limited Co Of Development And Utilization Of Waste Residue In Yongping County Of Teda
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Application filed by Limited Co Of Development And Utilization Of Waste Residue In Yongping County Of Teda filed Critical Limited Co Of Development And Utilization Of Waste Residue In Yongping County Of Teda
Priority to CN201910384800.0A priority Critical patent/CN110243177A/en
Publication of CN110243177A publication Critical patent/CN110243177A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00Crucible or pot furnaces
    • F27B14/06Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • F27B14/061Induction furnaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00Crucible or pot furnaces
    • F27B14/08Details peculiar to crucible or pot furnaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00Crucible or pot furnaces
    • F27B14/08Details peculiar to crucible or pot furnaces
    • F27B14/20Arrangement of controlling, monitoring, alarm or like devices

Abstract

The invention discloses a kind of more monocrystalline silicon to cut slag method of smelting, the furnace roof for solving existing silicon cutting slag melting induction furnace is naked, can be because silicon powder is taken away the oxidation of silicon or air extractor and the problem of non-uniform temperature be easy to cause silicon melt to splash etc. the yield of melting silicon is caused to reduce when melting by oxygen.The present invention is fed intake the following steps are included: opening lid, closes lid, and graphite plate height is adjusted, and induction heating and bottom lead to inert gas, and melting plays furnace discharge.The present invention has many advantages, such as that can effectively prevent slag crust, silicon oxidation and silicon powder is taken away by dust exhaust apparatus, refines silicon high income.

Description

A kind of more monocrystalline silicon cutting slag method of smelting
Technical field
The present invention relates to silicon melting induction furnace technical fields, and in particular to a kind of more monocrystalline silicon cutting slag method of smelting.
Background technique
Silicon cutting slag can be used to melt down recrystallize, purify, present silicon material it is in short supply, it is expensive.
Existing silicon cutting slag often carries out melting with induction furnace, and in fusion process, since the silicon face of melting is easy Slag is formed, it is not oxidized that slag plays protection melt in fusion process, but slag is cold slag, i.e., will not incude generation The temperature of heat, slag is maintained by the heat that silicon melt provides, when the exothermic temperature of slag is higher than the biography of silicon melt body When hot, slag will be in the surface crust of silicon melt.If skull is melted not in time or is beaten by external force, skull lower space shape At confined space, the gas that melting generates cannot discharge in time, will explode after reaching certain pressure, and silicon melting sprays, Security risk is caused, on the other hand, non-uniform temperature when melting, it is also possible to cause a part of silicon melt to splash out, therefore, in order to The generation of this negative consequence is prevented, open design is traditionally arranged to be at the top of induction furnace, and dust suction is arranged in the top of furnace roof Device is evacuated.
On the one hand existing open design will lead to the oxygen in air and oxidation reaction occur into silicon melt, another Aspect, dust exhaust apparatus can take the silicon powder not melted partially away in pumping process, and these two aspects can reduce the yield of silicon melting, How to guarantee in melting process the uniformity of temperature and reduce oxidation and raw material to be pumped be anxious on silicon cutting slag melting technique Problem to be solved.
Summary of the invention
It, can be because the technical problems to be solved by the present invention are: the furnace roof of existing silicon cutting slag melting induction furnace is naked Silicon powder is taken away by the oxidation of silicon or air extractor for oxygen and non-uniform temperature be easy to cause silicon melt to fly when melting It splashes etc. and the yield of melting silicon to be caused to reduce.
The present invention provides a kind of more monocrystalline silicon cutting slag method of smelting to solve the above problems.
The present invention is achieved through the following technical solutions:
A kind of more monocrystalline silicon cutting slag method of smelting, include the following steps:
Step 1: starting lifting device lifts lid, and silicon is added into crucible and cuts slag;
Step 2: starting lifting device makes its decline, contacts graphite plate on cover cap, is adjusted with the crucible;
Step 3: opening induction coil and carry out induction heating, open bottom air valve, start logical inert gas;
Step 4: melting 1.5-2.0h under conditions of smelting temperature is 1500-1700 DEG C;
Step 5: stopping induction coil heating and ventilation, play furnace discharge.
Design principle of the invention are as follows: graphite plate is set above crucible, and graphite plate move down by lifting device It is dynamic, before silicon cutting slag melting, graphite plate is first moved to the position contacted with crucible, in this way, in induction heating, graphite Energy induction heating forms comprehensive induction heating, and heating speed is fast, and after silicon is melt into liquid, can be in silicon melt body Surface forms slag, and slag can crust when temperature difference occur in top and bottom, thus easily causes the safety of lower section contained explosion Graphite plate is arranged in hidden danger above, and graphite plate energy induction heating reduces the temperature difference of slag top and bottom to a certain extent, The crust situation of silicon melt surface slag can be slowed down;On the other hand, it is just passed through inert gas before cutting silicon melting, it can To exclude the partial air in crucible, reduce oxygen content, so that the amount that silicon is oxidized after temperature raising is reduced, and when cutting After silicon melting, the inert gas that bottom is passed through can be moved up, and have certain stirring action to silicon melt, promote silicon melting The temperature uniformity of liquid, and inert gas can rise to silicon melt surface and form bubbling, be bubbled rupture to silicon melt surface Slag has the function of that destroying its crusts, and the present invention effectively prevent slag from temperature difference above and below temperature uniformity and slag surface Crust prevents contained explosion in crucible, the generation of the safety accidents such as silicon melt splashing, and cuts slag sense by covering progress silicon Melting is answered, the silicon amount for reducing oxidation and being taken away by dust exhaust apparatus improves the yield of silicon.
Preferably a kind of more monocrystalline silicon of the present invention cut slag method of smelting, and the bottom of the graphite plate in the step 2 is vertically set Nose bar is set, when graphite plate touches crucible, the nose bar is extend under the silicon melt position in the crucible.
Preferably a kind of more monocrystalline silicon of the present invention cut slag method of smelting, and the upper end of connecting column connects driving motor, the drive Dynamic motor is mounted on spreader.
Preferably a kind of more monocrystalline silicon cutting slag method of smelting of the present invention are in the fusion process of the step 4, interval starting Lifting device, so that graphite plate interval rise and fall, disturb the slag of molten silicon surface.
Preferably a kind of more monocrystalline silicon of the present invention cut slag method of smelting when graphite plate decline penetrates in silicon melt, Open driving motor, driving graphite plate rotation.
When silicon cutting slag is heated as molten condition, in order to further prevent slag to crust, driven by lifting device Graphite plate moves up and down, and intermittence penetrate being pierced by silicon melt surface, prevents slag in surface crust, and in nose bar After being inserted into below the silicon melt, starting driving motor makes graphite plate rotation to drive nose bar to rotate, and nose bar turns Dynamic one side can be stirred homogenization temperature to silicon melt, on the other hand stir to the slag on silicon melt surface, It prevents from crusting.
Preferably a kind of more monocrystalline silicon of the present invention cut slag method of smelting, and the nose bar includes graphite mandrel and aluminium oxide ceramics Shell, graphite rod are easy brittle failure, and graphite rod is arranged in the inside of nose bar, and outer layer is wrapped up with aluminium oxide, and graphite rod can incude life Heat, and multiple nose bars are located at the different location of silicon melt, it can while being heated, and can. while heating Stirring, increases the temperature uniformity of silicon melt.
Preferably a kind of more monocrystalline silicon of the present invention cut slag method of smelting, and the inert gas is argon gas or helium.
Preferably a kind of more monocrystalline silicon of the present invention cut slag method of smelting, and 10-15min closes air valve before playing furnace discharge, stops Only it is passed through inert gas.
Equipment used in the method for the present invention, a kind of silicon cutting slag melting induction furnace, including furnace body, lid and lifting device, Connecting column passes through the lid and connect with the lifting device above the lid, and the other end of the connecting column connects graphite plate, The graphite plate is located at the top in the furnace body and being in crucible, and blowning installation is arranged in the bottom of the furnace body.
The blowning installation includes tracheae, air nozzle, and crucible bottom is run through in one end of the air jet pipe, the tracheae it is another One end connects air accumulator, and preheater is additionally provided on tracheae, for being preheated to the gas of penetrating, the insertion of the tracheae End is provided with nozzle, and the nozzle is bottoms that are multiple and being evenly arranged on crucible.
The upper end of connecting column connects driving motor, and the driving motor is connect with the lifting device.
The bottom of the graphite plate is vertically installed with nose bar, and lifting device will drive on nose bar during up and down motion Lower movement prevents its crust so that the slag to molten silicon surface is abolished.
The nose bar is multiple.
Sharp portion is arranged in the end of the nose bar, and sharp portion can be easy to when being passed down through slag surface because pressure is big It penetrates.
Multiple through-holes are set on the graphite plate, and through-hole is conducive to the gas generated in material in fusion process discharge.
Link is arranged in the top of the lid, and the link is detachably connected with the lifting device, when needing to take off lid, It can be increased by lifting device and lift lid, facilitate the operation such as fed, discharged.
The link is two, and is located at the two sides of the connecting column Yu the lid junction, is being promoted in this way Be not in offset when lid, it is made to rise or decline along its axis direction always.
Exhaust outlet is set on the lid, furnace gas is discharged in time prevents explosion etc..
The lifting device includes spreader, the vertical column and hydraulic cylinder connecting with the spreader, the connecting column and institute Spreader connection is stated, the hydraulic cylinder controls vertical column and goes up and down that the spreader is driven to move up and down, the laborsaving section of hydraulic cylinder Can, it is easy to operate.
The present invention have it is following the utility model has the advantages that
1. the present invention reduces molten silicon by graphite plate induction heat by the way that liftable graphite plate is arranged on induction furnace The temperature difference of the upper and lower surfaces of surface slag, to prevent from crusting.
2. nose bar is arranged in the bottom of graphite plate in the present invention, in the process that lifting device control graphite plate rises or falls In, nose bar can be penetrated and be pierced by molten silicon surface, and nose bar may be rotated, to the agglomeration of molten silicon surface into Row is abolished, and effectively prevent exploding.
3. through-hole is arranged in the present invention on graphite plate, exhaust outlet is set on lid, enable the gas generated in furnace and When be discharged, effectively prevent exploding.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is positive structure diagram of the present invention.
Label and corresponding parts title in attached drawing:
1- lid, 2- furnace body, 3- crucible, 4- graphite plate, 5- connecting column, 6- nose bar, 7- spreader, the vertical column of 8-, 9- link, 10- exhaust outlet, 11- observation window, 12- lanyard, 13- driving motor, 14- nozzle, 15- tracheae, 16- preheater, 17- air valve.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made For limitation of the invention.
Embodiment 1
A kind of more monocrystalline silicon cutting slag method of smelting, include the following steps:
Step 1: starting lifting device lifts lid 1, and silicon is added into crucible 3 and cuts slag;
Step 2: starting lifting device makes its decline, and lid 1 is covered, and adjusts graphite plate 4 and contacts with the crucible 3;
Step 3: opening induction coil and carry out induction heating, open bottom air valve 17, start logical inert gas helium;
Step 4: melting 1.5-2.0h under conditions of smelting temperature is 1500-1700 DEG C;
Step 5: stopping induction coil heating, play furnace discharge.
The bottom of the graphite plate 4 is vertically arranged nose bar 6, and when graphite plate 4 touches crucible 3, the nose bar 6 is extend into Under silicon melt position in the crucible 3.
The upper end of connecting column 5 connects driving motor 13, and the driving motor 13 is mounted on spreader 7.
In the fusion process of the step 4, start lifting device at interval of 15min, so that under graphite plate 4 intermittently rises Drop, disturbs the slag of molten silicon surface, and residence time of the nose bar 6 in silicon melt is 10-12min.
Embodiment 2
The present embodiment the difference from embodiment 1 is that, the inert gas being passed through be argon gas, nose bar 6 be inserted into silicon melt Open driving motor 13 afterwards below, driving graphite plate 4 rotates, and the time rotated every time is 10-12min.
On the one hand the rotation of nose bar 6 can be stirred homogenization temperature to silicon melt, on the other hand to silicon melt surface Slag stirred, prevent from crusting.
Embodiment 3
As shown in Figure 1, equipment used in the method for the present invention, a kind of silicon cutting slag melting induction furnace, including furnace body 2, lid 1 And lifting device, connecting column 5 pass through the lid 1 and connect with the lifting device above the lid 1, the connecting column 5 it is another One end connects graphite plate 4, and the graphite plate 4 is located in the furnace body 2 and is in the top of crucible 3, and the bottom of the furnace body 2 is set Set blowning installation.
The blowning installation includes tracheae 15, air nozzle, and 3 bottom of crucible, the tracheae are run through in one end of the tracheae 15 15 other end connects air accumulator, and preheater 16 is additionally provided on tracheae 15, described for preheating to the gas of penetrating The insertion end of tracheae 15 is provided with nozzle 14, and the nozzle 14 is 5 and is evenly arranged on the bottom of crucible 3.
The upper end of connecting column 5 connects driving motor 13, and the driving motor 13 is connect with the lifting device.
The bottom of the graphite plate 4 is vertically installed with nose bar 6, and lifting device will drive nose bar 6 during up and down motion It moves up and down, so that the slag to molten silicon surface is abolished, prevents its crust.
The nose bar 6 is multiple bottoms for being evenly arranged on the graphite plate 4.
Sharp portion is arranged in the end of the nose bar 6, and sharp portion can be because pressure be big and easy when being passed down through slag surface In penetrating.
Multiple through-holes are set on the graphite plate 4, and through-hole is conducive to the gas generated in material in fusion process discharge.
Link 9 is arranged in the top of the lid 1, and lanyard 12 is fixedly connected on the lifting device and is located at 12 end of lanyard Hook, it is described to be hooked on link 9, link up with as existing elastic opening hook, i.e., can be open in hook, and connecting Cheng Hou, closure of openings prevent hook from falling off from link 9, when needing to take off lid, can be increased by lifting device and lift lid 1, facilitate the operation such as fed, discharged.
The lanyard 12 is soft steel wire, can bear centainly hot and solid.
The link 9 is two, and is located at the two sides of the connecting column 5 and 1 junction of lid, the lanyard 12 be two, and is located on spreader 7 position of the vertical top in the link 9, in this way will not when promoting lid 1 It deviates, it is made to rise or decline along its axis direction always.
Exhaust outlet 10 is set on the lid 1, and furnace gas is discharged in time prevents explosion etc..
Observation window 11 is also set up on the lid 1, for observing the situation in furnace body 2.
The lifting device includes spreader 7, the vertical column 8 and hydraulic cylinder connecting with the spreader 7, the connecting column 5 It is connect with the spreader 7, the hydraulic cylinder controls vertical column 8 and goes up and down that the spreader 7 is driven to move up and down, hydraulic cylinder Lowering energy-saving, it is easy to operate.
Induction coil, insulating layer etc. are the prior art, are not shown in attached drawing of the present invention.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include Within protection scope of the present invention.

Claims (8)

1. a kind of more monocrystalline silicon cut slag method of smelting, which comprises the steps of:
Step 1: starting lifting device lifts lid (1), cuts slag to silicon is added in crucible (3);
Step 2: starting lifting device makes its decline, and lid (1) is covered, and adjusts graphite plate (4) and contacts with the crucible (3);
Step 3: opening induction coil and carry out induction heating, open the air valve (17) of bottom, start logical inert gas;
Step 4: melting 1.5-2.0h under conditions of smelting temperature is 1500-1700 DEG C;
Step 5: stopping induction coil heating and ventilation, play furnace discharge;
Multiple through-holes are set on the graphite plate (4).
2. a kind of more monocrystalline silicon according to claim 1 cut slag method of smelting, which is characterized in that in the step 2 The bottom of graphite plate (4) is vertically installed with nose bar (6).
3. a kind of more monocrystalline silicon according to claim 2 cut slag method of smelting, which is characterized in that connecting column (5) it is upper End connection driving motor (13), the driving motor (13) are mounted on spreader (7).
4. a kind of more monocrystalline silicon according to claim 2 or 3 cut slag method of smelting, which is characterized in that in the step 4 Fusion process in, interval starting lifting device so that graphite plate (4) interval rise and fall, to the slag of molten silicon surface into Row disturbance.
5. a kind of more monocrystalline silicon according to claim 4 cut slag method of smelting, which is characterized in that in the graphite plate (4) it when decline is penetrated in silicon melt, opens driving motor (13), driving graphite plate (4) rotation.
6. according to the described in any item a kind of more monocrystalline silicon cutting slag method of smelting of claim 2,3 or 5, which is characterized in that institute Stating nose bar (6) includes graphite mandrel and aluminium oxide ceramics shell.
7. -3 or 5 described in any item a kind of more monocrystalline silicon cutting slag method of smelting according to claim 1, which is characterized in that institute Stating inert gas is argon gas or helium.
8. -3 or 5 described in any item a kind of more monocrystalline silicon cutting slag method of smelting according to claim 1, which is characterized in that 10-15min closes air valve (17) before playing furnace discharge, and stopping is passed through inert gas.
CN201910384800.0A 2019-05-09 2019-05-09 A kind of more monocrystalline silicon cutting slag method of smelting Pending CN110243177A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1676237A (en) * 2005-04-05 2005-10-05 北京交通大学 Vacuum mechanical dual-stirring casting method for preparing granule reinforced aluminium-base composite material
CN102976332A (en) * 2012-12-13 2013-03-20 青岛隆盛晶硅科技有限公司 Method and equipment for directional solidification and purification of polycrystalline silicon through taking tailing by quartz tube
CN104556048A (en) * 2014-12-25 2015-04-29 大连理工大学 Equipment and separating method for separating high metal impurity region in polycrystalline silicon orientated solidification and purification
CN105568373A (en) * 2016-03-14 2016-05-11 常州兆晶光能有限公司 Polycrystalline silicon ingot furnace protection gas circulation system
CN106482514A (en) * 2016-12-09 2017-03-08 永平县泰达废渣开发利用有限公司 A kind of induction furnace based on electron beam gun melts silicon and plays furnace apparatus and technique
CN109133068A (en) * 2018-11-19 2019-01-04 成都斯力康科技股份有限公司 Metallurgy method removal of impurities prepares the device and method of solar-grade silicon ingot

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1676237A (en) * 2005-04-05 2005-10-05 北京交通大学 Vacuum mechanical dual-stirring casting method for preparing granule reinforced aluminium-base composite material
CN102976332A (en) * 2012-12-13 2013-03-20 青岛隆盛晶硅科技有限公司 Method and equipment for directional solidification and purification of polycrystalline silicon through taking tailing by quartz tube
CN104556048A (en) * 2014-12-25 2015-04-29 大连理工大学 Equipment and separating method for separating high metal impurity region in polycrystalline silicon orientated solidification and purification
CN105568373A (en) * 2016-03-14 2016-05-11 常州兆晶光能有限公司 Polycrystalline silicon ingot furnace protection gas circulation system
CN106482514A (en) * 2016-12-09 2017-03-08 永平县泰达废渣开发利用有限公司 A kind of induction furnace based on electron beam gun melts silicon and plays furnace apparatus and technique
CN109133068A (en) * 2018-11-19 2019-01-04 成都斯力康科技股份有限公司 Metallurgy method removal of impurities prepares the device and method of solar-grade silicon ingot

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