CN106744970B - aluminum ingot furnace drawing process for melting silicon by induction furnace - Google Patents
aluminum ingot furnace drawing process for melting silicon by induction furnace Download PDFInfo
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- CN106744970B CN106744970B CN201611129946.3A CN201611129946A CN106744970B CN 106744970 B CN106744970 B CN 106744970B CN 201611129946 A CN201611129946 A CN 201611129946A CN 106744970 B CN106744970 B CN 106744970B
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- silicon
- furnace
- induction furnace
- melting
- aluminum ingot
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B2014/002—Smelting process, e.g. sequences to melt a specific material
Abstract
The invention discloses an aluminum ingot furnace lifting process for melting silicon by using an induction furnace, which comprises the steps of putting a silicon block or silicon powder into the induction furnace, starting the induction furnace, heating to 700-800 ℃, melting the aluminum ingot to form molten aluminum, continuously heating to 1700-1800 ℃, melting the silicon block or the silicon powder to form molten silicon, gradually adding the silicon block or the silicon powder into mixed liquid to improve the content of silicon in the mixed liquid of silicon and aluminum, pouring 85-90% of the mixed liquid when the mixed solution in the induction furnace is full, and adding the silicon block or the silicon powder gradually again to ensure that the silicon content in the mixed solution reaches the standard, thereby completing furnace lifting.
Description
Technical Field
The invention relates to the field of recycling and processing of silicon slag, in particular to aluminum ingot furnace drawing processes for melting silicon by using an induction furnace.
Background
The silicon slag is the remainder of raw ore after extraction, and contains quantitative silicon, silicon slag is various, such as industrial silicon slag, solar silicon slag, semiconductor silicon slag and the like, the silicon slag can be recycled for recrystallization and purification, the silicon slag is in short supply of silicon materials and is not expensive, the silicon-manganese slag is also called silicomanganese smelting slag, is industrial waste slag discharged during smelting silicomanganese alloy, is loose in structure and light green in appearance, and consists of porous amorphous particles with irregular shapes, the silicomanganese slag is brittle and fragile, large blocks of silicomanganese slag can be crushed into small blocks by a crusher, then the coarse crushed materials are crushed by a fine crusher in the step , the material entering a storage bin can be ensured to be dissociated to a monomer degree, then the material is uniformly fed into a trapezoidal jigging machine for separation by a vibrating conveyor, the crushed main purpose is to break the connected structure, the jigging purpose of breaking is to recover manganese silicomanganese alloy from the silicomanganese slag, the silicon slag and the silicon slag are separated from a trapezoidal jigging machine by a dewatering screen, and metal tailings with a dewatering effect of a dewatering screen.
The induction furnace is an electric furnace which heats or melts materials by using the induction heating effect of the materials. The induction furnace adopts 3 kinds of alternating current power supplies, namely, a power frequency (50 or 60 Hz), a medium frequency (150-10000 Hz) and a high frequency (higher than 10000 Hz). The main components of the induction furnace are an inductor, a furnace body, a power supply, a capacitor, a control system and the like. Under the action of the alternating electromagnetic field in the induction furnace, eddy currents are generated in the material, so that the heating or melting effect is achieved. Induction furnaces are generally classified into induction heating furnaces and melting furnaces. The smelting furnace is divided into a cored induction furnace and a coreless induction furnace. The core induction furnace is mainly used for smelting and heat preservation of various metals such as cast aluminum and the like, can utilize waste furnace materials, and is low in smelting cost. The coreless induction furnace is divided into a power frequency induction furnace, a frequency tripling induction furnace, a generator set intermediate frequency induction furnace, a silicon controlled intermediate frequency induction furnace and a high frequency induction furnace. Induction furnaces are divided according to frequency: 50 Hz power frequency furnace, 150-10000 Hz intermediate frequency furnace and 10000Hz high frequency furnace.
The main equipment of the current silicon smelting is a crucible, the technology of silicon smelting by using the crucible is mature, but the maximum defects of the crucible are that the capacity is too small, the single smelting amount is small, and the bottleneck of difficult mass production directly restricts the development of silicon.
Disclosure of Invention
The invention aims to provide aluminum ingot drawing processes for melting silicon by using an induction furnace, and processes are established to improve the silicon melting efficiency, so that the yield of silicon is greatly improved, and the aim of reducing the mass production cost is fulfilled.
The invention is realized by the following technical scheme:
A process for pulling out aluminum ingot by using induction furnace to melt silicon, comprising the following steps:
(a) putting a silicon block or silicon powder into an induction furnace, and adding an aluminum ingot into the induction furnace;
(b) starting an induction furnace, heating to 700-800 ℃, and melting an aluminum ingot to form molten aluminum;
(c) continuously heating to 1700-1800 ℃, and melting the silicon blocks or the silicon powder into silicon liquid;
(d) gradually adding silicon blocks or silicon powder into the mixed liquid prepared in the step (c) to improve the content of silicon in the silicon-aluminum mixed liquid, pouring 85-90% of the mixed liquid when the mixed solution in the induction furnace is full, and adding the gradually added silicon blocks or silicon powder again;
(e) and (d) repeating the step (d) to enable the silicon content in the mixed solution to reach the standard, and finishing the furnace starting.
The invention discloses a furnace lifting process, which is actually the most important part in a silicon melting process, and the applicant finds that the existing silicon melting technology is performed by using a crucible, the size of the crucible cannot be too large due to the shape and physical properties of the crucible, the yield is limited due to the smaller size, the applicant researches an induction furnace in the melting technology in detail, the induction furnace is used for melting metal, silicon is a non-metal material, and the induction furnace cannot be used, in order to melt silicon by using the induction furnace, the applicant improves the process, the technical prejudice is overcome, the temperature is heated to 700-800 ℃ by adding an aluminum ingot into a silicon block when the furnace is lifted, the temperature reaches the melting temperature of aluminum, the aluminum ingot is melted to form aluminum water, the aluminum ingot is used as a heat generating component of the induction furnace to generate a large amount of heat, the temperature is continuously raised to 1700 ℃, the silicon block reaches the melting temperature and is melted to form silicon water after absorbing the heat, the weak conductivity of the silicon water can generate heat, the purpose of melting the silicon block is achieved, the purpose of mixing the silicon block is achieved by using the aluminum and the liquid, the silicon liquid, the crucible is diluted by using the principle of the crucible, the crucible can be quickly diluted silicon melting furnace, the yield can be increased, and the yield can be increased by using the crucible for producing process, compared with the crucible, the crucible can be increased by using the crucible.
The induction furnace is an intermediate frequency furnace, and the working frequency of the induction furnace is 100-140 HZ. The applicant has carried out a number of thousands of experiments on existing induction furnaces and has experimentally found the type of induction furnace that can be used for silicon smelting: the intermediate frequency furnace is not used by all intermediate frequency furnaces, the intermediate frequency furnaces have the frequency of 150-10000 HZ in the prior art, although the structure of the intermediate frequency furnace is adopted in the invention, the operation parameters of the intermediate frequency furnace are greatly adjusted to be 100-140 HZ, at the moment, the intermediate frequency furnace actually belongs to an abnormal working interval of the intermediate frequency furnace, silicon is smelted by using a morbid working state, the cognitive range of technicians in the field is greatly exceeded, meanwhile, the condition of silicon smelting is also met, unexpected advantages are obtained, and the intermediate frequency furnace has breakthrough progress for the field of silicon smelting, greatly improves the mass production of silicon smelting, and promotes the development of the industry.
The working frequency of the intermediate frequency furnace is 110-120 HZ. optimal, more optimal ranges are finally determined by continuously adjusting and revising parameters of the intermediate frequency furnace, and in the ranges, the silicon smelting speed is high and the efficiency is high.
In the step (a), the weight ratio of the silicon block or silicon powder to the aluminum ingot is 1.2-2: 1. in the process of blowing out, the weight ratio of the aluminum ingot to the weight of the silicon is researched, if the weight ratio of the aluminum ingot is too large, the utilization rate of heat energy is low, and if the weight ratio of the aluminum ingot is too small, the time of blowing out is prolonged, so that the rapid blowing out production is not facilitated.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention relates to an aluminum ingot furnace-starting process for melting silicon by using an induction furnace, which comprises the steps of adding an aluminum ingot into a silicon block during furnace starting, heating the silicon block to 700-800 ℃, wherein the temperature reaches the melting temperature of aluminum, the aluminum ingot is melted to form molten aluminum, the aluminum ingot is used as a heat generating component of the induction furnace to generate a large amount of heat, the temperature is continuously increased to 1700-1800 ℃, the silicon block absorbs the heat and then reaches the melting temperature and is melted to form molten silicon, the weak conductivity of the molten silicon can be used for inducing heat to achieve the purpose of melting the silicon block, the aluminum and the silicon are melted into mixed liquid, the high conductivity of the mixed liquid is used for rapidly melting the silicon, and then the dilution is carried out for multiple times by using the dilution principle of dilution to obtain the silicon water meeting the requirements, so that the furnace is rapidly started, and the requirement of quantitative production is met, and compared with the maximum capacity of 20KG of a crucible, the invention uses the induction furnace for silicon melting, the mode of melting, which can increase the amount of monomer to 5 tons, and greatly improves the yield and the production efficiency compared with the;
2. the aluminum ingot drawing process for melting silicon by using the induction furnace has the advantages that the operation parameters are greatly adjusted to be 100-140 HZ, at the moment, the process actually belongs to the abnormal working interval of the intermediate frequency furnace, silicon is melted by using the ill-state working state, the cognitive range of technicians in the field is greatly exceeded, the silicon melting condition is met, unexpected advantages are obtained, the process is a breakthrough progress in the field of silicon melting, the mass production of silicon melting is greatly improved, and the development of the industry is promoted.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in with reference to the following examples, which are only used for explaining the present invention and are not used as limitations thereof.
Examples
The aluminum ingot furnace drawing process for melting silicon by using an induction furnace is carried out according to the following steps:
(a) putting a silicon block or silicon powder into an intermediate frequency furnace, and adding an aluminum ingot into the intermediate frequency furnace, wherein the weight of the silicon block and the weight of the aluminum ingot are 2: 1;
(b) starting the induction furnace, adjusting the working frequency of the intermediate frequency furnace to 120HZ, starting to heat the aluminum ingot to 700-800 ℃, and melting the aluminum ingot to form aluminum water;
(c) continuously heating to 1700-1800 ℃, and melting the silicon blocks or the silicon powder into silicon liquid;
(d) gradually adding silicon blocks or silicon powder into the mixed liquid prepared in the step (c) to improve the content of silicon in the silicon-aluminum mixed liquid, pouring 85-90% of the mixed liquid when the mixed solution in the induction furnace is full, and adding the gradually added silicon blocks or silicon powder again;
(e) and (d) repeating the step (d) to ensure that the silicon content in the mixed solution reaches the standard, finishing the furnace starting, adding silicon powder or silicon blocks into the silicon water to start silicon smelting, pouring out silicon liquid after the completion of the single smelting, and simultaneously reserving part of the silicon liquid in the intermediate frequency furnace for the next times of smelting.
In this embodiment, the single capacity of intermediate frequency furnace is 3.5 tons, according to the specification and prior art of intermediate frequency furnace, can improve the capacity to 5 tons, and single time of drawing the stove is 12 to 15 minutes, and single time of smelting is 80 ~ 100 minutes, for the production mode of crucible, has improved production efficiency greatly.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention have been described in , it should be understood that the above-mentioned embodiments are only illustrative and not intended to limit the scope of the present invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1, aluminum ingot furnace drawing process for melting silicon by using induction furnace, which is characterized by comprising the following steps:
(a) putting a silicon block or silicon powder into an induction furnace, and adding an aluminum ingot into the induction furnace;
(b) starting an induction furnace, heating to 700-800 ℃, and melting an aluminum ingot to form molten aluminum;
(c) continuously heating to 1700-1800 ℃, and melting the silicon blocks or the silicon powder into silicon liquid;
(d) gradually adding silicon blocks or silicon powder into the mixed liquid prepared in the step (c) to improve the content of silicon in the silicon-aluminum mixed liquid, pouring 85-90% of the mixed liquid when the mixed solution in the induction furnace is full, and gradually adding the silicon blocks or the silicon powder again;
(e) repeating the step (d) to ensure that the furnace drawing is finished when the silicon content in the mixed solution reaches the standard; the induction furnace is an intermediate frequency furnace, and the working frequency of the induction furnace is 100-140 Hz.
2. The kind of aluminum ingot pulling process using induction furnace for melting silicon as claimed in claim 1, wherein the operating frequency of the IF furnace is 110-120 Hz.
3. The kind of aluminum ingot furnace-starting process for melting silicon by using an induction furnace, as claimed in claim 1, wherein in step (a), the weight ratio of the silicon block or powder to the aluminum ingot is 1.2-2: 1.
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| CN106744970B true CN106744970B (en) | 2020-01-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008031229A1 (en) * | 2006-09-14 | 2008-03-20 | Silicium Becancour Inc. | Process and apparatus for purifying low-grade silicon material |
| CN103080387A (en) * | 2010-06-16 | 2013-05-01 | 山特森西特股份有限公司 | Process and apparatus for manufacturing polycrystalline silicon ingots |
| CN105296810A (en) * | 2015-10-15 | 2016-02-03 | 远东电缆有限公司 | Continuous casting and continuous rolling production process of high-strength aluminum alloy rod |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008031229A1 (en) * | 2006-09-14 | 2008-03-20 | Silicium Becancour Inc. | Process and apparatus for purifying low-grade silicon material |
| CN103080387A (en) * | 2010-06-16 | 2013-05-01 | 山特森西特股份有限公司 | Process and apparatus for manufacturing polycrystalline silicon ingots |
| CN105296810A (en) * | 2015-10-15 | 2016-02-03 | 远东电缆有限公司 | Continuous casting and continuous rolling production process of high-strength aluminum alloy rod |
Non-Patent Citations (1)
| Title |
|---|
| 4343A 铝合金扁锭生产工艺研究;巩建国等;《轻合金加工技术》;20131231;第41卷(第6期);第28页左栏第19-33行 * |
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Effective date of registration: 20171110 Address after: 610000 No. 1, unit 1, No. 57, No. 2, community street, Chengdu Town, Tianfu District, Sichuan Applicant after: Chengdu Sili Kang Polytron Technologies Inc Address before: Su Tun Cun 672600 Yunnan Autonomous Prefecture of Dali Bonan town Applicant before: Limited company of development and utilization of waste residue in Yongping County of TEDA |
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