CN112375874A - Refining slag composition for ferrosilicon external furnace refining with aluminum content less than 0.1% - Google Patents
Refining slag composition for ferrosilicon external furnace refining with aluminum content less than 0.1% Download PDFInfo
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- CN112375874A CN112375874A CN202011149012.2A CN202011149012A CN112375874A CN 112375874 A CN112375874 A CN 112375874A CN 202011149012 A CN202011149012 A CN 202011149012A CN 112375874 A CN112375874 A CN 112375874A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to the field of ferrosilicon refining, in particular to a refining slag composition for ferrosilicon external refining with the aluminum content lower than 0.1 percent, which is prepared from raw materials of quartz sand, fluorite and lime in a specific ratio, has the characteristics of low melting point, good fluidity and good aluminum and calcium reduction effects, and can ensure that the removal rate of aluminum reaches 85 percent, the removal rate of calcium reaches 95 percent and the aluminum content of ferrosilicon can be controlled below 0.1 percent when the refining slag composition is applied to the external refining of the ferrosilicon.
Description
Technical Field
The invention relates to the field of ferrosilicon refining, in particular to a refining slag composition for ferrosilicon external refining, wherein the aluminum content of the refining slag composition is lower than 0.1%.
Background
The ferrosilicon is a steelmaking deoxidizer, a casting inoculant, a metal reducing agent and the like, and is continuously produced by smelting silica, steel scraps (or iron oxide) and a reducing agent metallurgical coke in an ore smelting furnace. With the development of science and technology and material industry, higher and higher requirements are put on the quality of steel, and ferrosilicon with extremely low impurity content such as aluminum, calcium, phosphorus, sulfur and the like is required to be provided. Ferrosilicon containing high aluminum content is not beneficial to steel-making pouring, and especially for certain types of steel, the excessive consumption of ferrosilicon in deoxidation in certain types of steel can cause abnormal structures of the steel and promote the graphitization tendency of the steel; in ferritic and pearlitic steels, when aluminum is contained in them, they have low high-temperature strength and toughness, and cause several difficulties in smelting and casting. Aluminum in ferrosilicon is a harmful impurity; the high aluminum content in the ferrosilicon alloy can lead to alloy pulverization, and the melting point of the ferrosilicon is reduced, so that aluminum is enriched in a low melting point region in the casting process of the ferrosilicon to form a flash. Therefore, in the ferrosilicon production industry, it is generally necessary to perform dealumination of ordinary ferrosilicon by means of external refining. The main refining modes include oxidation refining and chlorination refining.
Chlorination refining has great environmental pollution and high investment cost and is gradually eliminated; the oxidation refining method has the advantages of simple and convenient operation, low investment cost and small environmental pollution, and is adopted by a plurality of enterprises. The operation of oxidation refining is often matched with the auxiliary operation of refining slag.
The prior domestic external refining method adopts fluorite, quartz sand and iron concentrate powder as refining slag to carry out external refining. The method has the advantages that the removal rate of aluminum is about 75 percent, the removal rate of calcium is about 85 percent, and the production of the ferrosilicon product with the aluminum content of less than 0.2 percent can be met.
Chinese patent CN110218836A discloses a ferrosilicon dealuminization purification method, refining dealuminization is carried out by adopting refining slag, and the chemical components of the first refining slag meet the following ranges in percentage by weight: 75-85% of SiO2(ii) a 10% -15% of CaO; 3% -5% of Al2O3The balance being alkali metal oxides, including Li2O、Na2O、K2One or more of O, and the particle state is hollow sphere with the diameter of 2-5 mm. The chemical components of the second refining slag satisfy the following ranges in percentage by weight: 60% -80% of CaF2(ii) a 10% -30% of CaO; 10% -15% of SiO2The granule state is 50-100 mesh powder. By using the method for external refining, the content of ferrosilicon aluminum can be reduced to 0.3-0.5%, but ferrosilicon with the aluminum content lower than 0.1% cannot be obtained.
Chinese patent CN110157860A discloses a refining slag for purifying and dealuminizing ferrosilicon and a preparation method thereof, and the components are as follows by mass percent: 40-60% of cyclone well silt, 10-20% of converter fly ash, 15-30% of quartz sand and 8-15% of borax. Wherein the mass percent of CaO in the cyclone well sediment is 5-10%, SiO2 is 15-30%, the total content of alkali metal oxides is less than 5%, and Fe2O320 to 40 percent. Fe in converter fly ash according to mass percentage2O360 to 80 percent; SiO in quartz sand285-95% of borax, B2O360 to 75 percent. When the refining slag is used for ferrosilicon smelting, the aluminum content of ferrosilicon can be reduced to 0.5-0.6%, but ferrosilicon with the aluminum content lower than 0.1% cannot be obtained.
The inventor finds that if the ferrosilicon product with the aluminum content of less than 0.1 percent is produced, the adding amount of the refining slag needs to be increased, but the phenomenon of ladle sticking in a ladle is serious due to the large adding amount of the refining slag, the slag skimming is difficult, the slag iron ratio is more than 20 percent, the production waste is caused, the time for external refining is long, and the refining time needs to be more than 45 minutes. Is not suitable for producing products with the aluminum content of less than 0.1 percent.
Disclosure of Invention
The invention aims to provide a refining slag composition for ferrosilicon external refining with the aluminum content lower than 0.1%, and solves the problems of large dosage of refining slag, serious phenomenon of in-ladle adhesion and long time of external refining in the ferrosilicon external refining process with the aluminum content lower than 0.1% in the related technology.
The object of the present invention is achieved by the following means.
The invention provides a ferrosilicon external refining slag composition with aluminum content lower than 0.1%, which comprises the following components in parts by weight:
60-70 parts of quartz sand,
20-30 parts of lime,
10-30 parts of fluorite.
Further, the composition comprises the following components in parts by weight:
65 portions of quartz sand,
21 portions of lime,
14 parts of fluorite.
Furthermore, the content of silicon dioxide in the quartz sand is more than or equal to 97%, and the content of titanium element is less than 0.1%.
Further, the content of calcium oxide in the lime is more than 85%.
Further, the content of calcium fluoride in the fluorite is more than 80%.
In another aspect, the present invention provides a method for refining ferrosilicon having an aluminum content of less than 0.1% using the composition, the method comprising the steps of:
1) mixing silica, petroleum coke and silicon steel sheets and smelting;
2) quartz sand, lime and fluorite are mixed to prepare refining slag;
3) adding the refining slag in the step 2) for secondary refining during tapping;
4) and finishing slag adding operation until tapping is finished, and casting and forming.
Further, in the step 3), the refining slag is added by adopting a continuous small-amount slag adding method, the adding amount is 8-12% of the total mass of the ferrosilicon smelting raw materials, and the whole refining time is 15-25 minutes.
The compositions are proportioned according to parts by weight, can be increased or reduced according to corresponding proportions during production, and the units can be g, kg, t and other weight units known by the technical personnel in the field, and the weight can be increased or reduced, but the proportion of the weight proportions among the compositions is not changed.
The main advantages of the invention are:
1) quartz sand, fluorite and lime are used as refining slag to carry out external refining treatment. Fluorite can lower the melting point of the slag and enhance the fluidity of the slag, so that the oxidation reaction of the aluminum element is accelerated to be carried out towards the positive direction. However, the addition proportion of fluorite is too high, which causes the formed refining slag to be rather rare, so that the slag is not easy to crust, and the cast ferrosilicon wraps the slag to influence the product quality.
2) The quartz sand, lime and aluminum form an aluminum-gehlenite slag system to play roles in reducing aluminum and calcium.
3) The invention adds lime and fluorite. The heat released by lime oxidation can balance the heat loss in the refining process, fluorite can reduce the melting point of slag and enhance the fluidity of slag iron, so that the ladle sticking condition of the ladle is improved, and if the input amount of the refining slag is increased, the aluminum content can be reduced to 0.04 percent.
4) The refining slag provided by the invention can enable the removal rate of aluminum to reach 85% and the removal rate of calcium to reach 95% in the external refining process, and can improve the removal rate by 10% compared with the existing external refining method.
5) The refining slag provided by the invention can shorten the refining time, reduce the addition of the refining slag, reduce the production cost and reduce the specific energy of the slag iron from the original 20% to 12% in the external refining.
6) In the process of producing ferrosilicon by using a smaller furnace type, if molten iron produced by one furnace is only 3.5-4 tons, at the moment, the temperature of the molten iron is quickly lost in the refining process, so that the ladle sticking phenomenon is caused in the refining process, and the refining effect is influenced.
Drawings
FIG. 1: a process flow chart of a ferrosilicon smelting method.
Detailed Description
The materials used in the present invention are all commercially available sources unless otherwise specified, wherein,
the silicon content in the silica is more than 98 percent, and the aluminum element content is less than 0.5 percent;
the fixed carbon content of the petroleum coke is more than 84 percent;
the carbon element content in the silicon steel sheet is less than 0.1%;
the content of silicon dioxide in the quartz sand is more than 97 percent, and the content of titanium element is less than 0.1 percent;
the content of calcium oxide in lime is more than 85 percent;
the content of calcium fluoride in fluorite is more than 80 percent.
Example 1
Method for smelting ferrosilicon with aluminum content lower than 0.1%
1) Mixing the silicon iron smelting raw materials of silica, petroleum coke and silicon steel sheets, and smelting;
2) mixing 65 parts of quartz sand, 21 parts of lime and 14 parts of fluorite to prepare refining slag;
3) and (3) adding the refining slag obtained in the step 2) during tapping for secondary refining, wherein the refining slag is added by adopting a continuous small-amount slag adding method, the adding amount is 10% of the total mass of the ferrosilicon smelting raw materials, and the whole refining time is 20 minutes.
4) And finishing slag adding operation until tapping is finished, and casting and forming.
The refined ferrosilicon aluminum element content is lower than 0.1 percent, the silicon element content is more than 75 percent, and the titanium element content is lower than 0.015 percent, which meets the requirement of the brand FeSi75Al0.5-A in the national Standard GB/T2272-2009 of the people's republic of China.
Example 2
Method for smelting ferrosilicon with aluminum content lower than 0.1%
1) Mixing the silicon iron smelting raw materials of silica, petroleum coke and silicon steel sheets, and smelting;
2) 70 parts of quartz sand, 28 parts of lime and 25 parts of fluorite are mixed by ingredients to prepare refining slag;
3) and (3) adding the refining slag obtained in the step 2) during tapping for secondary refining, wherein the refining slag is added by adopting a continuous small-amount slag adding method, the adding amount is 8% of the total mass of the ferrosilicon smelting raw materials, and the whole refining time is 25 minutes.
4) And finishing slag adding operation until tapping is finished, and casting and forming.
The refined ferrosilicon aluminum element content is lower than 0.1 percent, the silicon element content is more than 75 percent, and the titanium element content is lower than 0.015 percent, which meets the requirement of the brand FeSi75Al0.5-A in the national Standard GB/T2272-2009 of the people's republic of China.
Example 3
Method for smelting ferrosilicon with aluminum content lower than 0.1%
1) Mixing the silicon iron smelting raw materials of silica, petroleum coke and silicon steel sheets, and smelting;
2) 60 parts of quartz sand, 28 parts of lime and 30 parts of fluorite are mixed to prepare refining slag;
3) and (3) adding the refining slag obtained in the step 2) during tapping for secondary refining, wherein the refining slag is added by adopting a continuous small-amount slag adding method, the adding amount is 12% of the total mass of the ferrosilicon smelting raw materials, and the whole refining time is 15 minutes.
4) And finishing slag adding operation until tapping is finished, and casting and forming.
The refined ferrosilicon aluminum element content is lower than 0.1 percent, the silicon element content is more than 75 percent, and the titanium element content is lower than 0.015 percent, which meets the requirement of the brand FeSi75Al0.5-A in the national Standard GB/T2272-2009 of the people's republic of China.
Comparative example 1
The difference from example 1 is that lime is replaced by fine iron powder.
Smelting method of ferrosilicon
1) Mixing the silicon iron smelting raw materials of silica, petroleum coke and silicon steel sheets, and smelting;
2) mixing 65 parts of quartz sand, 21 parts of fine iron powder and 14 parts of fluorite to prepare refining slag;
3) and (3) adding the refining slag obtained in the step 2) during tapping for secondary refining, wherein the refining slag is added by adopting a continuous small-amount slag adding method, the adding amount is 10% of the total mass of the ferrosilicon smelting raw materials, and the whole refining time is 20 minutes.
4) And finishing slag adding operation until tapping is finished, and casting and forming.
Although the refined ferrosilicon meets the requirement of the mark FeSi75Al0.5-A in the national Standard GB/T2272-2009 of the people's republic of China, the content of the aluminum element is higher than 0.1 percent and the requirement that the content of the aluminum element in the ferrosilicon is lower than 0.1 percent cannot be met.
The present invention focuses on the step of external refining of ferrosilicon, and therefore, in the production for the purpose of producing ferrosilicon, the conventional steps employed prior to the step of external refining in combination with the method of external refining of the present invention are within the scope of the present invention.
Claims (8)
1. The ferrosilicon external refining slag composition with the aluminum content lower than 0.1 percent comprises the following components in parts by weight:
60-70 parts of quartz sand,
20-30 parts of lime,
10-30 parts of fluorite.
2. The composition of claim 1, consisting of, in parts by weight:
65 portions of quartz sand,
21 portions of lime,
14 parts of fluorite.
3. The composition of claim 1, wherein the silica content of the silica sand is 97% or more and the titanium content is less than 0.1%.
4. The composition of claim 1, wherein the lime has a calcium oxide content greater than 85%.
5. The composition of claim 1 wherein said fluorite has a calcium fluoride content greater than 80%.
6. A method of refining ferrosilicon having an aluminum content of less than 0.1% using the composition of claim 1, the method comprising the steps of:
1) mixing silica, petroleum coke and silicon steel sheets and smelting;
2) quartz sand, lime and fluorite are mixed to prepare refining slag;
3) adding the refining slag in the step 2) for secondary refining during tapping;
4) and finishing slag adding operation until tapping is finished, and casting and forming.
7. The method of claim 6, wherein in the step 3), the refining slag is added by a continuous small-amount slag adding method.
8. The method of claim 6, wherein the addition amount of the refining slag is 8-12% of the total mass of the ferrosilicon smelting raw materials, and the total refining time is 15-25 minutes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304523A (en) * | 2020-03-31 | 2020-06-19 | 西安宏信矿热炉有限公司 | Production process of low-aluminum ferrosilicon |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR870007295A (en) * | 1986-01-22 | 1987-08-18 | 한국과학기술원 | Manufacturing method of high purity ferrosilicon |
| CN105063280A (en) * | 2015-08-24 | 2015-11-18 | 宁夏太阳镁业有限公司 | Slagging medium and preparation method thereof |
| CN108715972A (en) * | 2018-06-19 | 2018-10-30 | 青海百通高纯材料开发有限公司 | A kind of low-phosphorous silicon iron product and its smelting process |
| CN108754143A (en) * | 2018-06-13 | 2018-11-06 | 鄂尔多斯市西金矿冶有限责任公司 | A method of producing Antaciron using metallurgical white residue |
| CN110157860A (en) * | 2019-05-14 | 2019-08-23 | 鞍钢股份有限公司 | Refining slag for purification and dealumination of ferrosilicon and preparation method thereof |
| CN111304523A (en) * | 2020-03-31 | 2020-06-19 | 西安宏信矿热炉有限公司 | Production process of low-aluminum ferrosilicon |
-
2020
- 2020-10-23 CN CN202011149012.2A patent/CN112375874A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR870007295A (en) * | 1986-01-22 | 1987-08-18 | 한국과학기술원 | Manufacturing method of high purity ferrosilicon |
| CN105063280A (en) * | 2015-08-24 | 2015-11-18 | 宁夏太阳镁业有限公司 | Slagging medium and preparation method thereof |
| CN108754143A (en) * | 2018-06-13 | 2018-11-06 | 鄂尔多斯市西金矿冶有限责任公司 | A method of producing Antaciron using metallurgical white residue |
| CN108715972A (en) * | 2018-06-19 | 2018-10-30 | 青海百通高纯材料开发有限公司 | A kind of low-phosphorous silicon iron product and its smelting process |
| CN110157860A (en) * | 2019-05-14 | 2019-08-23 | 鞍钢股份有限公司 | Refining slag for purification and dealumination of ferrosilicon and preparation method thereof |
| CN111304523A (en) * | 2020-03-31 | 2020-06-19 | 西安宏信矿热炉有限公司 | Production process of low-aluminum ferrosilicon |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304523A (en) * | 2020-03-31 | 2020-06-19 | 西安宏信矿热炉有限公司 | Production process of low-aluminum ferrosilicon |
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