CN106219550B - A kind of method and production system preparing industrial silicon using industrial waste SILICA FUME - Google Patents
A kind of method and production system preparing industrial silicon using industrial waste SILICA FUME Download PDFInfo
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- CN106219550B CN106219550B CN201610588751.9A CN201610588751A CN106219550B CN 106219550 B CN106219550 B CN 106219550B CN 201610588751 A CN201610588751 A CN 201610588751A CN 106219550 B CN106219550 B CN 106219550B
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- 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
- C01B33/021—Preparation
- C01B33/023—Preparation by reduction of silica or free silica-containing material
- C01B33/025—Preparation by reduction of silica or free silica-containing material with carbon or a solid carbonaceous material, i.e. carbo-thermal process
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2006/80—Compositional purity
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Abstract
The present invention relates to a kind of methods preparing industrial silicon using industrial waste SILICA FUME, include the following steps：S1 is first encrypted industrial waste SILICA FUME, and mixed ingredients are then carried out with reducing agent and are stirred, mixed material is obtained；Water is added into mixed material and is stirred by S2, is handled through balling-up after stirring and SILICA FUME pelletizing is made；S3 19 21min of reducing and smelting at a temperature of 1,600 2000 DEG C by SILICA FUME pelletizing, you can obtain industrial silicon.The invention also includes a kind of production system preparing industrial silicon using industrial waste SILICA FUME, which includes SILICA FUME storing encryption storehouse, reducing agent storage bin, double imperial stirring mixers, two pairs of rollers pressurization nodulizer and reducing and smelting stove；The primary raw material that the present invention is reduced smelting can be all waste material SILICA FUME, and the reduction rate of recovery of SILICA FUME is more than 85%, not only solve the problems, such as that SILICA FUME overall availability was low and pollutes environment, but also produce relatively high industrial silicon product.
Description
Technical field
The invention belongs to nonferrous metallurgy production technical fields, and in particular to a kind of dust using the recycling of Environmental-protecting dust-removing device is useless
Expect the method and production system of the high-quality industrial silicon of production.
Background technology
The method of the industrial silicon of China's production at present mainly uses river mine or mountain mine silica as raw material, is used after adding reducing agent
Mineral hot furnace carries out pyrolytic semlting production.And it is unfavorable for the impurity of also original production in the silica of mountain mine or river mine containing there are many, if not
Add processing that will reduce the quality of finished product, in order to improve product quality, needs first to carry out oxygen supply removal in smelting process mostly.
Industrial silicon will produce a large amount of waste material accompaniment-SILICA FUME in process of production simultaneously, often produces 1 ton of industrial silicon according to statistics and accompanies someone
There is 0.4 ton or so of SILICA FUME.In SILICA FUME dioxide-containing silica be more than 95% or more, remaining insufficient 5% predominantly carbon with
And other trace impurities, it is very suitable for smelting high-quality industrial silicon, but due to SILICA FUME very light weight, and when generating
The transformation of form, if directly being applied in metallic silicon smelting as raw material, will face charging and material restore this two
A problem.Therefore SILICA FUME is used generally as additive, but dosage is seldom, can all have a large amount of SILICA FUME to accumulate every year,
Since SILICA FUME spends small, light specific gravity, blowing and raining is met, which will float through wind-force forms haze to aerial, or through rainwater
It washes away into underground and directly affects water quality, environment is caused seriously to pollute, need the later stage that a large amount of fund is spent to go to maintain
The management of SILICA FUME.In addition the SILICA FUME of a large amount of associations also results in the decline of industrial silicon production enterprise production capacity, and production cost becomes
Height greatly reduces the competitiveness of China's industrial silicon industry.Therefore the comprehensive utilization of SILICA FUME has become industrial silicon production
One problem of enterprise, up to the present, there are no ripe process synthesis to utilize SILICA FUME, is returned to the life of industrial silicon
In production.
Application No. is CN201210327693.6 to disclose a kind of method of reduction melting SILICA FUME, mainly comprises the following steps stone
English mine, charcoal, bituminous coal and bonding agent sodium metasilicate are crushed to certain granularity according to the requirement of technique, broken material with
SILICA FUME is mixed, while bonding agent sodium metasilicate is added, and water is slowly added in mixed process, mixture is put into mold
It is pressed, release obtains the suitable SILICA FUME pelletizing of shape size, and SILICA FUME pelletizing is put into atmosphere furnace and is roasted
It burns, the SILICA FUME pelletizing after roasting is put into smelting furnace and carries out reduction melting.The invention is using SILICA FUME as production industrial silicon
Part material, solve the pollution problem of dust in silicon metallurgical industry to a certain extent, but the SILICA FUME for reduction exists
Proportion is less than 50% in entire raw material, and the process is more complicated, it is necessary first to by be originally used for solid block quartz mine,
Charcoal, bituminous coal are broken for 20-300 μm of fine particle, then again with the SILICA FUME of light specific gravity through adding water to be combined, finally also
Repressed, roasting is needed to obtain to carry out melting after compression strength and density all meet the SILICA FUME pelletizing of reduction requirement and obtaining into
Product are extremely spent human and material resources, and are not suitable for industrial production.
Invention content
In view of this, utilizing the micro- silicon of industrial waste it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of
Powder prepares the method and production system of industrial silicon, and preparation process of the present invention is simple, safe and efficient, raw materials used other than reducing agent
It can be all waste material SILICA FUME, and the reduction rate of SILICA FUME is more than 85%, and it is low and dirty to efficiently solve SILICA FUME overall availability
Contaminate the problem of environment.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A method of industrial silicon being prepared using industrial waste SILICA FUME, is included the following steps：
S1：Industrial waste SILICA FUME is encrypted first, mixed ingredients are then carried out with reducing agent and is stirred, is obtained
Mixed material；
S2：Water is added into the mixed material to be stirred, is handled through balling-up after stirring and SILICA FUME pelletizing is made；
S3：By the SILICA FUME pelletizing at a temperature of 1600-2000 DEG C reducing and smelting 19-21min, you can obtain industry
Silicon.
Preferably：The parts by weight of SILICA FUME described in S1 are 90-110, and the parts by weight of the reducing agent are 36-60.5, S2
Described in water parts by weight be 9-11.
Using the SILICA FUME of above-mentioned parts by weight, reducing agent and water hybrid reaction, it can be achieved that 85% or more the reduction rate of recovery.
Preferably：The reducing agent is one or more of coke blacking, petroleum coke or raw coal, if it is several when, to appoint
Meaning ratio mixes.
Further：Reducing agent described in S1 is the petroleum coke and/or raw coal that iron-holder is respectively less than 1.5%, if iron content
When amount is respectively less than 0.15% petroleum coke and raw coal, the two is mixed with arbitrary proportion.
When reducing agent is that iron-holder is respectively less than 0.15% petroleum coke and/or raw coal, production cost is told somebody what one's real intentions are, and can be reduced
Iron content in finished industrial silicon, to obtain the industrial silicon of high-quality.
Further：The grain size of petroleum coke described in S1 and/or raw coal is respectively less than 5mm.
Coke blacking of the preferable particle size of the present invention less than 10mm avoids crushed in process of production as reducing agent
Journey reduces human cost, simplifies preparation process.Simultaneously when grain size is less than 10mm, it can be sufficiently mixed with SILICA FUME uniformly,
Convenient for subsequent reducing and smelting.In addition to selecting SILICA FUME that petroleum coke or raw coal also can be selected as reducing agent, when the oil of selection
When burnt or raw coal is blocky, petroleum coke or raw coal need to be crushed to the particle for being less than 10mm for grain size.
Preferably：Encryption described in S1 is to be encrypted the industrial waste SILICA FUME using the pneumatic encryption equipment of SILICA FUME
To 700-900kg/m3Density.
Preferably：The grain size of SILICA FUME pelletizing described in S2 is 50-80mm.
It is made as SILICA FUME pelletizing after mixing SILICA FUME, reducing agent and water in the present invention to carry out smelting again being because through adding
SILICA FUME density after close is larger, and internal voids are smaller, can have confined space if being added directly into smelting furnace and smelt
The potential danger of interior moment anoxic explosion, and the size controlling of SILICA FUME pelletizing had not only been eliminated into this harm in 50-80mm, but also
Automatic blanking can be achieved, smelted to greatest extent, shorten the duration of heat, reduce energy consumption.
A kind of production system using the above method, including SILICA FUME storing encryption storehouse, reducing agent storage bin, double dragon stirrings
Mixing machine, two pairs of rollers pressurization nodulizer and reducing and smelting stove；The discharge port in SILICA FUME storing encryption storehouse is stirred with double dragons
SILICA FUME measuring belt conveyer is equipped between the entrance of mixing machine, the discharge outlet in SILICA FUME storing encryption storehouse is equipped with micro-
Silica flour measures feed valve, after the encrypted processing of industrial waste SILICA FUME in SILICA FUME storing encryption storehouse, through micro- silicon
Powder metering feed valve control discharging is simultaneously delivered to through the SILICA FUME measuring belt conveyer in double imperial stirring mixers；Institute
It states and is equipped with reductant metering belt conveyor between the discharge port of reducing agent storage bin and the entrance of double imperial stirring mixers,
The discharge outlet of the reducing agent storage bin is equipped with reductant metering feed valve, and the reducing agent in the reducing agent storage bin is through institute
It is delivered to double dragons after stating the control discharging of reductant metering feed valve through the reductant metering belt conveyor and is stirred
In machine；It is equipped with mixed material belt between the discharge port and the entrance of two pairs of rollers pressurization nodulizer of double imperial stirring mixers
Conveyer, industrial waste SILICA FUME and the reducing agent for entering double imperial stirring mixers are mixed through double imperial stirring mixers
Close dispensing and form mixed material, the mixed material by the mixed material belt conveyor enter two pairs of rollers pressurization at
In ball machine；It is equipped with SILICA FUME pelletizing belt between the discharge port and the entrance of the reducing and smelting stove of the two pairs of rollers pressurization nodulizer
Conveyer, the mixed material form SILICA FUME pelletizing, the SILICA FUME pelletizing warp after the two pairs of rollers pressurize formed by balling machine
The SILICA FUME pelletizing belt conveyor, which enters, carries out reducing and smelting in the reducing and smelting stove.
Preferably：It is equipped with Environmental-protecting dust-removing device dust hood right over the entrance of double imperial stirring mixers.
Preferably：The inlet of the two pairs of rollers pressurization nodulizer is equipped with mixed material hopper, and the mixed material belt is defeated
It send machine that the mixed material is delivered to after the mixed material hopper to enter in two pairs of rollers pressurization nodulizer；The SILICA FUME
Mobile feeding vehicle is equipped between pelletizing belt conveyor and the reducing and smelting stove, the discharge outlet of the mobile feeding vehicle is equipped with
Pneumatic discharge valve, the SILICA FUME pelletizing pass through institute after the SILICA FUME pelletizing belt conveyor is delivered to mobile feeding vehicle
Pneumatic discharge valve is stated to put into the reducing and smelting stove.
Preferably：The reducing and smelting stove is medium-frequency induction furnace, and the surface of the medium-frequency induction furnace, which is equipped with, eliminates smoke
Dedusting range hood, the discharge outlet of the medium-frequency induction furnace are equipped with industrial silicon product ingot mould, described in the SILICA FUME pelletizing warp
Enter the industrial silicon product ingot mould after medium-frequency induction furnace reducing and smelting to be molded.
Medium-frequency induction furnace is a kind of power supply that power frequency 50HZ alternating currents are changed into intermediate frequency (300HZ is with up to 1000HZ)
Three-phase main-frequency alternating current is become direct current by device after rectification, then direct current is become adjustable electric current of intermediate frequency, supply by
The intermediate frequency alternating current flowed through in capacitance and induction coil, generates the highdensity magnetic line of force, and cut induction coil in induction coil
In the metal material that holds, prodigious vortex is generated in metal material.Medium-frequency induction furnace compared with other Casting Equipments,
With the thermal efficiency is high, smelting time is short, alloying element scaling loss is few, melting material is wide, environmental pollution is small, can accurately control metal
The advantages that temperature and ingredient of liquid.
The reaction equation of reducing and smelting process is：
Beneficial effects of the present invention：
The primary raw material that industrial silicon is produced in the present invention is SILICA FUME, instead of river mine or mountain mine usual in traditional mode of production
Silica raw material overcomes since SILICA FUME spends small, light specific gravity, if directly applying to hardly possible in metallic silicon smelting as raw material
With the technical barrier for feeding and restoring；
The present invention meets the raw material that reduction requires to make SILICA FUME become compression strength and density, first uses SILICA FUME
The pneumatic encryption equipment of SILICA FUME is encrypted, and (the waste material SILICA FUME density of usually production industrial silicon institute association is 100-
150kg/m3Left and right reaches 700kg/m after encrypted machine encryption3More than) it is not necessary that the quartz mine, charcoal, bituminous coal of solid block are broken
Broken to be mixed again with SILICA FUME after fine particle, the SILICA FUME volume of phase homogenous quantities reduces at this time, convenient for storage and dispensing, will add
SILICA FUME after close is changed into stirred type mixed material after mixing with reducing agent and water, which obtains aqueous
Amount is 5.1-8.0%, and SILICA FUME pelletizing, obtained SILICA FUME ball can be directly prepared into nodulizer it is not necessary that binder is added
Group can carry out melting continuously without sintering directly in medium-frequency induction furnace, save the time, and medium-frequency induction furnace is opposite
Favorable sealing property, the SILICA FUME pelletizing in it after carrying out reduction will not be aoxidized again, and recycling reduction rate is high, flue gas emission
It is few；It is only SILICA FUME additionally, due to the raw material being reduced, and the dioxide-containing silica in SILICA FUME is more than 95% or more, remaining is not
The 5% of foot predominantly carbon and other trace impurities, cooperation reducing agent carry out reducing and smelting, and obtained industrial silicon quality can reach
3303 trade mark standards below (according to the content of iron, aluminium, calcium in metallic silicon, metallic silicon can be divided into 553,441,411,421,
3303, the different trade mark such as 3305,2202,2502,1501,1101, concrete meaning is by taking 1101# as an example：First digit 1 represents
Content≤0.1% of Fe, second digit 1 represent content≤0.1% of Al；Afterwards two digits 01 represent the content of Ca≤
0.01%, so referred to as 1101)；
The waste material SILICA FUME recycled by Environmental-protecting dust-removing device is rationally utilized in the present invention, enhances each smelting industrial silicon enterprise
The enterprise of outlying mountain area of supervision is negligent of in great attention to Environmental-protecting dust-removing device, especially part environmental protection administration, makes Environmental-protecting dust-removing device
Fame follows merit；The economic value for improving industrial waste SILICA FUME simultaneously, it is few to take full advantage of all kinds of objectionable impurities in SILICA FUME
The advantages of, produce the industrial silicon product of high-quality；Pollution of the waste material SILICA FUME to environment is reduced, in addition the present invention is making
Pollution of the SILICA FUME to air is strictly controlled by rational production system during standby, such as SILICA FUME ball is being made in SILICA FUME
It is run under totally-enclosed state before group, and installs smoke abatement and dust control range hood above the fire door of smelting furnace, and smelting furnace is discharged
Flue gas administered, qualified discharge is realized.
Description of the drawings
Fig. 1 is the production system figure of the present invention.
In figure：1, SILICA FUME storing encrypts storehouse；2, reducing agent storage bin；3, SILICA FUME measures feed valve；4, reducing agent meter
Measure feed valve；5, Environmental-protecting dust-removing device dust hood；6, SILICA FUME measuring belt conveyer；7, reductant metering belt conveyor；8、
Double dragon stirring mixers；9, mixed material belt conveyor；10, mixed material hopper；11, two pairs of rollers pressurization nodulizer；12, micro- silicon
Sphere of powder group's belt conveyor；13；Mobile feeding vehicle；14, pneumatic discharge valve；15, smoke abatement and dust control range hood；16, reducing and smelting stove；
17, industrial silicon product ingot mould.
Specific implementation mode
Below by attached drawing and 4 specific embodiments, technical scheme of the present invention will be described in further detail, at this
In invention, if not refering in particular to, all parts, percentage are unit of weight, and all equipment and raw material etc. are commercially available
Or the industry is common.Method in following embodiments is unless otherwise instructed the conventional method of this field.
Embodiment 1
As shown in Figure 1, the present invention provides a kind of method preparing industrial silicon using industrial waste SILICA FUME, original used
Material includes SILICA FUME 90kg；Iron-holder is less than 0.15% petroleum coke 36kg；Water 9kg.
The specific steps are：
In the production system of the present invention, the SILICA FUME of above-mentioned parts by weight is encrypted through pneumatic encryption equipment, encryption is extremely
700kg/m3Density after be sent into SILICA FUME storing encryption storehouse 1 in, through SILICA FUME storing encrypt 1 lower part of storehouse SILICA FUME measure to
Material valve 3 automatically controls feed, and the SILICA FUME of gained is delivered to through SILICA FUME conveyer 6 in double imperial stirring mixers 8, same with this
When, the reductant metering feed valve 4 for opening 2 lower part of reducing agent storage bin passes through reducing agent conveyer after calculating feed automatically
7 are delivered in double imperial stirring mixers 8 and are mixed with SILICA FUME, air are polluted in whipping process in order to prevent, double
Imperial stirring mixer 8 is arranged above Environmental-protecting dust-removing device dust hood 5, when the mixed material of the two gained after mixing is through mixed
It closes material belt conveyor 9 and is delivered to mixed material hopper 10, above-mentioned parts by weight are added into mixed material hopper 10 at this time
Water is stirred, and is entered after stirring in two pairs of rollers pressurization nodulizer 11, it is 50mm SILICA FUME pelletizings that several grain sizes, which are made, wherein micro-
Silica flour in all operations before SILICA FUME pelletizing is made is run under totally-enclosed state, and the SILICA FUME pelletizing of gained is through micro- silicon
Sphere of powder group's belt conveyor 12 is delivered to mobile feeding vehicle 13, and reduction is put into through the pneumatic discharge valve 14 on mobile feeding vehicle 13
In smelting furnace 16 (medium-frequency induction furnace), smelting 19min is carried out at a temperature of 1600 DEG C, in order to avoid the pollution to air,
It is arranged above smoke abatement and dust control range hood 15 in medium-frequency induction furnace, the product after smelting is after industrial silicon product ingot mould 17
, the reduction rate of recovery through analyzing SILICA FUME is 85.03%.
Embodiment 2
As shown in Figure 1, the present invention provides a kind of method preparing industrial silicon using industrial waste SILICA FUME, original used
Material includes SILICA FUME 100kg；Iron-holder is less than 0.15% 40 parts of coke blacking；10 parts of water.
The specific steps are：
In the production system of the present invention, the SILICA FUME of above-mentioned parts by weight is encrypted through Pneumatic fluidized bed encryption equipment,
It encrypts to 750kg/m3Density after be sent into SILICA FUME storing encryption storehouse 1 in, through SILICA FUME storing encrypt 1 lower part of storehouse SILICA FUME
Metering feed valve 3 automatically controls feed, and the SILICA FUME of gained is delivered to through SILICA FUME conveyer 6 in double imperial stirring mixers 8, with
This opens the reductant metering feed valve 4 of 2 lower part of reducing agent storage bin simultaneously, defeated by reducing agent after calculating feed automatically
It send machine 7 to be delivered in double imperial stirring mixers 8 to be mixed with SILICA FUME, pollutes air in whipping process in order to prevent,
It is arranged above Environmental-protecting dust-removing device dust hood 5 in double imperial stirring mixers 8, when the mixed material of the two gained after mixing
It is delivered to mixed material hopper 10 through mixed material belt conveyor 9, above-mentioned weight is added into mixed material hopper 10 at this time
The water of part is stirred, and is entered after stirring in two pairs of rollers pressurization nodulizer 11, and it is 65mm SILICA FUME pelletizings that several grain sizes, which are made,
Middle SILICA FUME in all operations before SILICA FUME pelletizing is made is run under totally-enclosed state, the SILICA FUME pelletizing warp of gained
SILICA FUME pelletizing belt conveyor 12 is delivered to mobile feeding vehicle 13, is put into through the pneumatic discharge valve 14 on mobile feeding vehicle 13
In reducing and smelting stove 16 (medium-frequency induction furnace), 20min is smelted at a temperature of 1700 DEG C, in order to avoid the pollution to air,
It is arranged above smoke abatement and dust control range hood 15 in medium-frequency induction furnace, the product after smelting is after industrial silicon product ingot mould 17
, the reduction rate of recovery through analyzing SILICA FUME is 86.94%.
Embodiment 3
As shown in Figure 1, the present invention provides a kind of method preparing industrial silicon using industrial waste SILICA FUME, original used
Material includes 110 parts of SILICA FUME；Iron-holder is less than 0.15% 55 parts of raw coal；11 parts of water.
The specific steps are：
In the production system of the present invention, the SILICA FUME of above-mentioned parts by weight is encrypted through pneumatic encryption equipment, encryption is extremely
800kg/m3Density after be sent into SILICA FUME storing encryption storehouse 1 in, through SILICA FUME storing encrypt 1 lower part of storehouse SILICA FUME measure to
Material valve 3 automatically controls feed, and the SILICA FUME of gained is delivered to through SILICA FUME conveyer 6 in double imperial stirring mixers 8, same with this
When, the reductant metering feed valve 4 for opening 2 lower part of reducing agent storage bin passes through reducing agent conveyer after calculating feed automatically
7 are delivered in double imperial stirring mixers 8 and are mixed with SILICA FUME, air are polluted in whipping process in order to prevent, double
Imperial stirring mixer 8 is arranged above Environmental-protecting dust-removing device dust hood 5, when the mixed material of the two gained after mixing is through mixed
It closes material belt conveyor 9 and is delivered to mixed material hopper 10, above-mentioned parts by weight are added into mixed material hopper 10 at this time
Water is stirred, and is entered after stirring in two pairs of rollers pressurization nodulizer 11, it is 70mm SILICA FUME pelletizings that several grain sizes, which are made, wherein micro-
Silica flour in all operations before SILICA FUME pelletizing is made is run under totally-enclosed state, and the SILICA FUME pelletizing of gained is through micro- silicon
Sphere of powder group's belt conveyor 12 is delivered to mobile feeding vehicle 13, and reduction is put into through the pneumatic discharge valve 14 on mobile feeding vehicle 13
In smelting furnace 16 (medium-frequency induction furnace), 21min is smelted at a temperature of 2000 DEG C, in order to avoid the pollution to air, in
Frequency electric induction furnace is arranged above smoke abatement and dust control range hood 15, the product after smelting after industrial silicon product ingot mould 17 to obtain the final product.
The reduction rate of recovery through analyzing SILICA FUME is 85.73%.
Embodiment 4
As shown in Figure 1, the present invention provides a kind of method preparing industrial silicon using industrial waste SILICA FUME, original used
Material includes 110 parts of SILICA FUME；It is less than 0.15% coke blacking, petroleum coke and raw coal 60.5 with equal proportion mixing and iron-holder
Part；11 parts of water.
The specific steps are：
In the production system of the present invention, the SILICA FUME of above-mentioned parts by weight is encrypted through pneumatic encryption equipment, encryption is extremely
900kg/m3Density after be sent into SILICA FUME storing encryption storehouse 1 in, through SILICA FUME storing encrypt 1 lower part of storehouse SILICA FUME measure to
Material valve 3 automatically controls feed, and the SILICA FUME of gained is delivered to through SILICA FUME conveyer 6 in double imperial stirring mixers 8, same with this
When, the reductant metering feed valve 4 for opening 2 lower part of reducing agent storage bin passes through reducing agent conveyer after calculating feed automatically
7 are delivered in double imperial stirring mixers 8 and are mixed with SILICA FUME, air are polluted in whipping process in order to prevent, double
Imperial stirring mixer 8 is arranged above Environmental-protecting dust-removing device dust hood 5, when the mixed material of the two gained after mixing is through mixed
It closes material belt conveyor 9 and is delivered to mixed material hopper 10, above-mentioned parts by weight are added into mixed material hopper 10 at this time
Water is stirred, and is entered after stirring in two pairs of rollers pressurization nodulizer 11, it is 80mm SILICA FUME pelletizings that several grain sizes, which are made, wherein micro-
Silica flour in all operations before SILICA FUME pelletizing is made is run under totally-enclosed state, and the SILICA FUME pelletizing of gained is through micro- silicon
Sphere of powder group's belt conveyor 12 is delivered to mobile feeding vehicle 13, and reduction is put into through the pneumatic discharge valve 14 on mobile feeding vehicle 13
In smelting furnace 16 (medium-frequency induction furnace), 20min is smelted at a temperature of 1900 DEG C, in order to avoid the pollution to air, in
Frequency electric induction furnace is arranged above smoke abatement and dust control range hood 15, the product after smelting after industrial silicon product ingot mould 17 to obtain the final product.
The reduction rate of recovery through analyzing SILICA FUME is 85.43%.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, 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 (7)
1. a kind of method preparing industrial silicon using industrial waste SILICA FUME, includes the following steps：
S1:Industrial waste SILICA FUME is encrypted first, the encryption is will using the pneumatic encryption equipment of SILICA FUME
The industrial waste SILICA FUME is encrypted to 700-900kg/m3Density, then with reducing agent mixed ingredients and stir, obtain
The parts by weight of mixed material, the SILICA FUME are 90-110, and the parts by weight of the reducing agent are 36-60.5, and the reducing agent is
Iron-holder is respectively less than 0.15% petroleum coke and/or raw coal；
S2:Water is added into the mixed material to be stirred, the parts by weight of water are 9-11, are made micro- through balling-up processing after stirring
Silica flour pelletizing；
S3:By the SILICA FUME pelletizing at a temperature of 1600-2000 DEG C reducing and smelting 19-21min, you can obtain industrial silicon.
2. according to the method described in claim 1, it is characterized in that, the grain size of petroleum coke described in S1 and/or raw coal is respectively less than
5mm。
3. according to the method described in claim 1, it is characterized in that, the grain size of SILICA FUME pelletizing described in S2 is 50-80mm.
4. a kind of production system of application such as any one of claim 1-3 the methods, which is characterized in that stored up including SILICA FUME
Material encryption storehouse (1), reducing agent storage bin (2), double imperial stirring mixers (8), two pairs of rollers pressurization nodulizer (11) and reducing and smelting stove
(16)；
It is equipped with micro- silicon between the discharge port of SILICA FUME storing encryption storehouse (1) and the entrance of double imperial stirring mixers (8)
The discharge outlet of powder measuring belt conveyer (6), SILICA FUME storing encryption storehouse (1) is equipped with SILICA FUME metering feed valve (3),
After the encrypted processing of industrial waste SILICA FUME in SILICA FUME storing encryption storehouse (1), feed valve is measured through the SILICA FUME
(3) control discharges and is delivered in double imperial stirring mixers (8) through the SILICA FUME measuring belt conveyer (6)；
It is equipped with reducing agent meter between the discharge port of the reducing agent storage bin (2) and the entrance of double imperial stirring mixers (8)
Belt conveyor (7) is measured, the discharge outlet of the reducing agent storage bin (2) is equipped with reductant metering feed valve (4), the reduction
Reducing agent in agent storage bin (2) is after the reductant metering feed valve (4) control discharging through the reductant metering belt
Conveyer (7) is delivered in double imperial stirring mixers (8)；
It is equipped with mixture between the discharge port and the entrance of two pairs of rollers pressurization nodulizer (11) of double imperial stirring mixers (8)
Expect belt conveyor (9), industrial waste SILICA FUME and the reducing agent for entering double imperial stirring mixers (8) are imperial through described pair
Stirring mixer (8) mixed ingredients formed mixed material, the mixed material by the mixed material belt conveyor (9) into
Enter into two pairs of rollers pressurization nodulizer (11)；
It is equipped with SILICA FUME ball between the discharge port and the entrance of the reducing and smelting stove (16) of the two pairs of rollers pressurization nodulizer (11)
Group's belt conveyor (12), the mixed material form SILICA FUME pelletizing, institute after the two pairs of rollers pressurize nodulizer (11) balling-up
It states SILICA FUME pelletizing and is entered in the reducing and smelting stove (16) through the SILICA FUME pelletizing belt conveyor (12) and restored
It smelts.
5. a kind of production system as claimed in claim 4, which is characterized in that the entrance of double imperial stirring mixers (8) is just
Top is equipped with Environmental-protecting dust-removing device dust hood (5).
6. a kind of production system as claimed in claim 4, which is characterized in that the inlet of the two pairs of rollers pressurization nodulizer (11)
Equipped with mixed material hopper (10), the mixed material is delivered to the mixture by the mixed material belt conveyor (9)
Expect that hopper (10) enters in two pairs of rollers pressurization nodulizer (11) afterwards；The SILICA FUME pelletizing belt conveyor (12) and it is described also
Mobile feeding vehicle (13) is equipped between former smelting furnace (16), the discharge outlet of the mobile feeding vehicle (13) is equipped with pneumatic discharge valve
(14), the SILICA FUME pelletizing passes through after the SILICA FUME pelletizing belt conveyor (12) is delivered to mobile feeding vehicle (13)
In pneumatic discharge valve (14) input to the reducing and smelting stove (16).
7. a kind of production system as claimed in claim 4, which is characterized in that the reducing and smelting stove (16) is Medium frequency induction electricity
The surface of stove, the medium-frequency induction furnace is equipped with smoke abatement and dust control range hood (15), the discharge outlet of the medium-frequency induction furnace
Equipped with industrial silicon product ingot mould (17), the SILICA FUME pelletizing enters the industry after the medium-frequency induction furnace reducing and smelting
Silicon product ingot mould (17) is molded.
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| CN108017064B (en) * | 2017-12-27 | 2021-05-11 | 昌吉吉盛新型建材有限公司 | Method and device for impurity removal and activation of industrial silicon micro-silicon powder |
| CN108163860A (en) * | 2018-03-02 | 2018-06-15 | 邱清余 | A kind of industrial silicon rectification systems and refinery practice |
| CN108862279A (en) * | 2018-05-30 | 2018-11-23 | 江苏佳宇资源利用股份有限公司 | A kind of metallic silicon formula and preparation method thereof |
| CN108840339A (en) * | 2018-07-18 | 2018-11-20 | 大连理工大学 | A kind of high-efficient treatment method of Buddha's warrior attendant wire cutting silicon powder |
| CN109705944A (en) * | 2019-02-13 | 2019-05-03 | 新疆西部合盛硅业有限公司 | A kind of coal briquette bond of industrial silicon furnace, moulded coal and preparation method thereof |
| CN111807369B (en) * | 2020-07-21 | 2022-11-01 | 昆明理工大学 | Pelletizing method for silicon wafer cutting waste for smelting and recycling regenerated silicon |
| CN113697814A (en) * | 2021-09-17 | 2021-11-26 | 兰州理工大学 | Production method of carbon-silicon composite pellets for industrial silicon and silicon-series ferroalloy production |
| CN113896202B (en) * | 2021-11-16 | 2023-05-09 | 宁夏海盛实业有限公司 | Efficient industrial silicon smelting equipment and method |
| CN114538449A (en) * | 2022-02-10 | 2022-05-27 | 贵州理工学院 | Method for preparing industrial silicon refining slag agent by using micro silicon powder as raw material |
| CN116023069A (en) * | 2022-12-22 | 2023-04-28 | 杭州星科元祥能源有限公司 | Silica particle binder, preparation method, application and preparation method of silica spheres |
| CN116425164A (en) * | 2023-03-03 | 2023-07-14 | 成都易态科技有限公司 | Method for producing polycrystalline silicon |
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| CN101112986B (en) * | 2007-06-29 | 2010-07-28 | 商南中剑实业有限责任公司 | Method for producing industrial silicon by using petroleum coke as reducing agent |
| CN102627281A (en) * | 2012-04-27 | 2012-08-08 | 羊实 | Method for smelting metal silicon by using recycled silicon fines |
| CN104098099A (en) * | 2014-06-25 | 2014-10-15 | 中国科学院过程工程研究所 | Method utilizing waste carbon-containing pellets to smelt silicon |
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