CN1598017A - Smelting technology for producing silicon strontium alloy by outer furnace oxygen reducing aluminium calcium - Google Patents
Smelting technology for producing silicon strontium alloy by outer furnace oxygen reducing aluminium calcium Download PDFInfo
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- CN1598017A CN1598017A CN 200410059118 CN200410059118A CN1598017A CN 1598017 A CN1598017 A CN 1598017A CN 200410059118 CN200410059118 CN 200410059118 CN 200410059118 A CN200410059118 A CN 200410059118A CN 1598017 A CN1598017 A CN 1598017A
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Abstract
A smelting technics of reducing Al&Ca and producing Si&Sr with oxygenfilling out of furnace, passing through ferrosilicon, which is set in intermediate frequency inductedelectric furnace to melt, after melting adding scorification slag former as 2% weight percent asferrisilicon, fishing out the residues and coming out the furnace when the temperature rises to1550-1600deg.C, then pouring the solution into alloy bag to fill oxygen, the filling time is 3-8min, filling pressure is 0.02-0.05MPa, at the same time of filling process aluminium and calcium happen oxidation reaction, the oxidation outcome and slag former combine to form silicate sinter, making the aluminium content decrease to 0.5% and calcium content decrease to under 0.1%, afterfishing out residues, adding strontium according to weight percent, waiting until strontiummelting, after stirring symmetrically, then irrigating into mold.
Description
Technical Field
The invention belongs to an alloy smelting process, and particularly relates to a smelting process for producing a silicon-strontium alloy by reducing aluminum calcium through external oxygenation.
Background
The silicon-strontium alloy is mainly used as an inoculant for casting production. At present, the ferrosilicon or metallic silicon containing less aluminum and calcium is generally used for producing the silicon-strontium alloy by a method of remelting and mixing strontium in a medium-frequency induction furnace. In the production, the requirements for aluminum and calcium in the raw material ferrosilicon are strict, the aluminum content is required to be less than 0.5 percent, and the calcium content is required to be less than 0.1 percent. The ferrosilicon with low aluminum and low calcium has higher price and few manufacturers; the common ferrosilicon has sufficient source and low price, but because the content of aluminum and calcium is high and the ferrosilicon can not be directly used for production, the ferrosilicon or metallic silicon with high price and low content of aluminum and calcium can only be used for producing the strontium-silicon alloy at present.
Disclosure of Invention
The invention mainly solves the technical problem of providing a smelting process for producing the silicon-strontium alloy by reducing aluminum calcium through oxygen charging outside a furnace. According to the production process, the common ferrosilicon with the aluminum content of less than 1.5 percent and the calcium content of less than 1.0 percent can be adopted, and the production cost of the alloy can be obviously reduced on the premise of meeting the requirements of chemical components of the product.
The invention mixes materials according to the chemical components needed by theproduct, adopts a medium-frequency induction furnace to melt ferrosilicon, adopts an oxygenation method outside the furnace to reduce the content of aluminum and calcium in the ferrosilicon, and has the following smelting process:
placing ferrosilicon in a medium-frequency induction furnace for melting, adding a slag former with the weight of 2 percent of that of the ferrosilicon after furnace charge is melted, fishing out the slag when the temperature is raised to 1550-; pouring the melt into an alloy bag, then oxygenating for 3-8 minutes under the oxygenating pressure of 0.02-0.05Mpa, simultaneously adding a slagging agent which is 2-3% of the weight of the ferrosilicon, carrying out oxidation reaction on aluminum and calcium in the oxygenating process, combining the oxidation product with the slagging agent to form silicate slag, reducing the aluminum content in the ferrosilicon to 0.5% and the calcium content to below 0.1%, removing the slag out of the alloy bag, then adding metal strontium according to the weight proportion, stirring uniformly after the metal strontium is melted, and pouring the molten slag into a casting mold.
The raw material of the slag former is 80-90% of quartz sand, and the granularity is 0.5-1 mm; 10-20% fluorite with a particle size of 0-5 mm.
The oxidation reaction equation is as follows:
the oxidation product is combined with slag former to form stable silicate slag, and the oxygen charging time and pressure are regulated according to the content of aluminum and calcium in the ferrosilicon during production, so that the content of aluminum is reduced to 0.5%, and the content of calcium is reduced to below 0.1%.
The common ferrosilicon with less than 1.5 percent of aluminum and less than 1.0 percent of calcium can be adopted for producing the strontium-silicon alloy according to the invention, and the production cost of the strontium-silicon alloy can be obviously reduced because the ferrosilicon has sufficient supply and low price; the method can effectively reduce the content of aluminum and calcium in the common ferrosilicon, the chemical composition of the product meets the requirement, and the produced strontium-silicon alloy has stable quality.
Detailed Description
Smelting process for producing silicon-strontium alloy by adopting 0.5T medium-frequency induction furnace
The main components of the product are as follows: si 74-76%, Al less than or equal to 0.6%, Ca less than or equal to 0.10%, Sr0.8-1.1% and Fe the rest.
Adding 150kg of raw material No. 75 ferrosilicon into a medium-frequency induction furnace, adjusting the power to 180KW to melt furnace charge, adding 3kg of slag former after the furnace charge is melted, wherein the slag former is 80% of quartz sand with the granularity of 0.5-1mm, and 20% of fluorite with the granularity of 0-5 mm; and when the temperature reaches 1500-1600 ℃, fishing out the molten slag. Pouring the melt into an alloy bag, then oxygenating for 4-6 minutes under the oxygenating pressure of 0.02-0.05Mpa, adding 4kg of the slagging agent again, combining the oxidation product and the slagging agent to form silicate slag, removing the slag from the alloy bag, adding 2kg of metal strontium, stirring uniformly after melting, pouring into a casting mold, cooling and crushing according to the requirement of product granularity.
The package of the metal strontium is opened 2 minutes before the oxygenation is finished, so as to prevent oxidation.
Through inspection, all technical indexes meet the technical requirements of product quality.
According to the smelting process of the invention, other series of silicon-strontium alloys with different components can be produced by adjusting different proportions of raw materials and smelting process parameters.
Claims (2)
1. A smelting process for producing a silicon-strontium alloy by reducing aluminum calcium through external oxygenation is characterized in that ferrosilicon is placed in a medium-frequency induction furnace to be melted, a slag former accounting for 2% of the weight of the ferrosilicon is added after furnace burden is melted, and slag is taken out after the temperature is raised to 1550-; pouring the melt into an alloy bag, then oxygenating for 3-8 minutes under the oxygenating pressure of 0.02-0.05Mpa, simultaneously adding a slagging agent which is 2-3% of the weight of the ferrosilicon, carrying out oxidation reaction on aluminum and calcium in the oxygenating process, combining the oxidation product with the slagging agent to form silicate slag, reducing the aluminum content in the ferrosilicon to 0.5% and the calcium content to below 0.1%, removing the slag out of the alloy bag, then adding metal strontium according to the weight proportion, stirring uniformly after the metal strontium is melted, and pouring the molten slag into a casting mold.
2. A smelting process for producing Si-Sr alloy with outside oxygen to reduce Al-Ca content as claimed in claim 1, wherein the raw material of the slag former is 80-90% quartz sand with a particle size of 0.5-1 mm; 10-20% fluorite with a particle size of 0-5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410059118 CN1598017A (en) | 2004-08-10 | 2004-08-10 | Smelting technology for producing silicon strontium alloy by outer furnace oxygen reducing aluminium calcium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410059118 CN1598017A (en) | 2004-08-10 | 2004-08-10 | Smelting technology for producing silicon strontium alloy by outer furnace oxygen reducing aluminium calcium |
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| Publication Number | Publication Date |
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| CN1598017A true CN1598017A (en) | 2005-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410059118 Pending CN1598017A (en) | 2004-08-10 | 2004-08-10 | Smelting technology for producing silicon strontium alloy by outer furnace oxygen reducing aluminium calcium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109082494A (en) * | 2018-09-14 | 2018-12-25 | 商洛市德新冶金材料有限公司 | A method of utilizing high purity ferrosilicon powder production silicon strontium alloy |
-
2004
- 2004-08-10 CN CN 200410059118 patent/CN1598017A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109082494A (en) * | 2018-09-14 | 2018-12-25 | 商洛市德新冶金材料有限公司 | A method of utilizing high purity ferrosilicon powder production silicon strontium alloy |
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