CN109880960B - Environment-friendly slag modifier and preparation method thereof - Google Patents
Environment-friendly slag modifier and preparation method thereof Download PDFInfo
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Abstract
An environment-friendly slag modifier and a preparation method thereof, the environment-friendly slag modifier comprises the following components by mass percent: 30-40% of Al, 18-27% of CaO, 4-14% of Mn, 27-36% of Fe and the balance of inevitable impurities. The invention has no smoke and dust, no pollution to environment, improved slag alkalinity, and adsorption inclusion to create favorable conditions for smelting clean molten steel. According to the invention, the aluminum strip is adopted to replace the scrap aluminum particles, the manganese powder and the iron powder are added, and the passivated lime powder is added, so that the problems of large smoke dust, operation environment pollution and low aluminum utilization rate of the original product are effectively solved, and efficient deoxidation modification is realized; the passivated lime powder is added to improve the alkalinity of the molten slag, enhance the adsorption and inclusion capacity of the molten slag and effectively solve the problem that the molten steel inclusion affects the quality of steel; the core wrapping machine and the shearing machine are used for wrapping, shearing and compacting the materials, so that the forming target can be realized without adding a binding agent, the impurity carrying amount is reduced, and the production of clean steel is facilitated.
Description
Technical Field
The invention relates to an auxiliary material in the field of steelmaking, in particular to an environment-friendly slag modifier and a preparation method thereof.
Background
In recent years, with the increasing demand for high-performance and high-quality steel materials in various industries, there has been an increasing demand for molten steel cleanliness, particularly in the development of high-quality steel materials such as IF steel, line steel, and automotive steel O5 plates. In order to smelt clean molten steel meeting requirements, the elimination and control of high-oxidizing slag are one of key links, and are also one of key technologies for refining high efficiency. In order to control and eliminate highly oxidizing slag, steel mills generally adopt slag-stopping tapping to control the amount of slag discharged, but part of the slag enters the ladle from the converter along with the molten steel, and these slag productsThe entrained slag contains up to 25% of oxides, such as: FeO, MnO, etc., are sources of molten steel reoxidation. When smelting high-quality steel products, ladle slag is modified by using a ladle slag modifier, namely a slag modifier, so as to reduce the oxidability of the slag. There are 3 common slag modifiers: CaO + CaF2A base modifier; ② CaC2A base steel slag modifier; ③ Al-based ladle slag modifier. The preparation method comprises the steps of mixing the raw materials in proportion, conveying the mixture to a ball press, and pressing the mixture into elliptical particles. Due to the different materials and the characteristics of the product particles, the different defects are respectively shown in the using process, and the summary is as follows: CaO + CaF2The problem of high oxidability of slag cannot be fundamentally solved, and the slag cannot be adopted in smelting high-quality steel materials; ② CaC2The recarburization phenomenon of molten steel occurs in the use of the base, and the base is not suitable for low-carbon and ultra-low-carbon steel grades; the traditional Al-based ladle slag modifier has small Al material adding granularity, is greatly influenced by the rising of hot airflow on a molten steel surface, has low utilization rate, short reaction time and violent reaction, causes concentrated removal of smoke and aggravates environmental pollution; fourthly, the product density is low due to the composition of the raw materials, most of the added steel ladle slag floats on the surface of the steel slag, so that more aluminum is contacted with air, the loss is serious, and the resource waste is caused; raw materials are mostly raw materials, pre-melting treatment is not carried out, the content of substances generating gas is high, a large amount of smoke and dust are generated during use, the environment is seriously polluted, and the requirement of environmental protection cannot be met.
Disclosure of Invention
The invention aims to provide an environment-friendly slag modifier and a preparation method thereof, and the slag modifier is free of smoke and dust, does not pollute the environment, improves the alkalinity of slag and creates favorable conditions for smelting clean molten steel by adsorbing impurities.
In order to achieve the purpose, the invention adopts the following technical scheme:
an environment-friendly slag modifier comprises the following components in percentage by mass: 30-40% of Al, 18-27% of CaO, 4-14% of Mn, 27-36% of Fe and the balance of inevitable impurities.
A preparation method of an environment-friendly slag modifier comprises the following steps:
1) mixing manganese powder and iron powder in proportion by a spiral stirrer, uniformly mixing and loading into a charging bucket;
2) filling the passivated lime powder into another material tank;
3) placing the two material tanks at the core material blanking position of the core-spun yarn machine, and adding the materials to the pre-deformed aluminum strip in proportion;
4) the material is coated, pressed, molded and transmitted to a shearing machine through a core-spun yarn machine, and is sheared and compacted into finished particles according to specifications.
The cross section size phi of the finished product particles is 9-15 mm, and the length of the finished product particles is 30-40 mm.
Mn in the manganese powder is more than or equal to 99 wt%; the granularity of the manganese powder is less than or equal to 2 mm; the adding proportion of the manganese powder is 4-14 wt%;
fe in the iron powder is more than or equal to 90 wt%; the particle size of the iron powder is less than or equal to 2 mm; the adding proportion of the iron powder is 30-40 wt%;
CaO in the passivated lime powder is more than or equal to 90 wt%, and S is less than or equal to 0.05 wt%; the particle size of the passivated lime powder is less than or equal to 3 mm; the adding proportion of the passivated lime powder is 20-30 wt%;
the Al content of the aluminum strip is more than or equal to 99 wt%; the specification thickness is 0.8-1.2 mm, and the width is 45-60 mm; the adding proportion is 30 wt% -40 wt%.
The invention overcomes the defects of the traditional slag modifier, has the characteristics of high efficiency, environmental protection and resource waste reduction, overcomes the defects of the original slag modifier by using the product, solves the problem of low aluminum utilization rate, obviously improves the problem of large smoke dust in the operating environment and obviously enhances the deoxidation modification effect. According to the invention, the metal aluminum strip with the thickness of (0.8-1.2) mm, (45-60) mm and (50-70) mm is used for replacing aluminum scraps in the traditional product and aluminum in aluminum ash, so that the reaction speed can be effectively slowed down, the problem of low aluminum utilization caused by concentrated overflow of heated gas and impact of hot gas on scrap powder metal aluminum with too small particle size is avoided, the aluminum utilization rate is improved, and the operation environment is improved; the addition of the iron powder and the manganese powder improves the density of the product, increases the proportion of the product immersed into the steel slag, improves the utilization rate of aluminum and reduces the resource waste to a certain extent; the aluminum and manganese elements exist simultaneously, so that the deoxidizing capacity can be enhanced when the aluminum and manganese elements exist independently, and the modification efficiency is improved. The addition of manganese element reduces the addition of manganese alloy in the refining link and reduces the refining cost; adding passivated lime to improve the alkalinity of molten slag, purifying molten steel to improve the slag adsorption and inclusion capacity, improving the desulfurization condition, realizing the forward movement of a refining function and shortening the smelting time; the clinker is used to reduce smoke dust, which is beneficial to environmental protection; the core wrapping machine and the shearing machine are used for wrapping, shearing and compacting the materials, so that the forming target without adding a binding agent is realized, and the impurity carrying amount is reduced.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to an environment-friendly slag modifier and a preparation method thereof, and the slag modifier is free of dust and environment pollution, improves the alkalinity of slag and creates favorable conditions for smelting clean molten steel by adsorbing impurities.
According to the invention, the aluminum strip is adopted to replace the scrap aluminum particles, the manganese powder and the iron powder are added, and the passivated lime powder is added, so that the problems of large smoke dust, operation environment pollution and low aluminum utilization rate of the original product are effectively solved, and efficient deoxidation modification is realized; the passivated lime powder is added to improve the alkalinity of the molten slag, enhance the adsorption and inclusion capacity of the molten slag and effectively solve the problem that the molten steel inclusion affects the quality of steel; the core wrapping machine and the shearing machine are used for wrapping, shearing and compacting the materials, so that the forming target can be realized without adding a binding agent, the impurity carrying amount is reduced, and the production of clean steel is facilitated.
Detailed Description
The present invention will be described in detail below, but the scope of the present invention is not limited to the following embodiments.
An environment-friendly slag modifier comprises the following components in percentage by mass: 30-40% of Al, 18-27% of CaO, 4-14% of Mn, 27-36% of Fe and the balance of inevitable impurities.
A preparation method of an environment-friendly slag modifier comprises the following steps:
1) mixing manganese powder and iron powder in proportion by a spiral stirrer, uniformly mixing and loading into a charging bucket;
2) filling the passivated lime powder into another material tank;
3) placing the two material tanks at the core material blanking position of the core-spun yarn machine, and adding the materials to the pre-deformed aluminum strip in proportion;
4) the material is coated, pressed, molded and transmitted to a shearing machine through a core-spun yarn machine, and is sheared and compacted into finished particles according to specifications.
The cross section size phi of the finished product particles is 9-15 mm, and the length of the finished product particles is 30-40 mm.
Mn in the manganese powder is more than or equal to 99 wt%; the granularity of the manganese powder is less than or equal to 2 mm; the adding proportion of the manganese powder is 4-14 wt%;
fe in the iron powder is more than or equal to 90 wt%; the particle size of the iron powder is less than or equal to 2 mm; the adding proportion of the iron powder is 30-40 wt%;
CaO in the passivated lime powder is more than or equal to 90 wt%, and S is less than or equal to 0.05 wt%; the particle size of the passivated lime powder is less than or equal to 3 mm; the adding proportion of the passivated lime powder is 20-30 wt%;
the Al content of the aluminum strip is more than or equal to 99 wt%; the specification thickness is 0.8-1.2 mm, and the width is 45-60 mm; the adding proportion is 30 wt% -40 wt%.
Example 1:
a preparation method of an environment-friendly slag modifier comprises the following steps:
1) mixing manganese powder and iron powder in proportion by a spiral stirrer, uniformly mixing and loading into a charging bucket;
2) filling the passivated lime powder into another material tank;
3) placing the two material tanks at the core material blanking position of the core-spun yarn machine, and adding the materials to the pre-deformed aluminum strip in proportion;
4) the material is coated, pressed, molded and transmitted to a shearing machine through a core-spun yarn machine, and is sheared and compacted into finished particles according to specifications.
The cross section size phi of the finished product particles is 10mm, and the length of the finished product particles is 35 mm.
99 wt% of Mn in the manganese powder; the granularity of the manganese powder is less than or equal to 2 mm; the adding proportion of the manganese powder is 6 wt%;
93.2 wt% of Fe in the iron powder; the particle size of the iron powder is less than or equal to 2 mm; the adding proportion of the iron powder is 33 wt%;
CaO 92.8 wt% and S0.0038 wt% in the passivated lime powder; the particle size of the passivated lime powder is less than or equal to 3 mm; the adding proportion of the passivated lime powder is 28 wt%;
99.6 wt% of aluminum strip Al; the specification thickness is 0.8mm, and the width is 45 mm; the proportion of addition was 33%.
The finished product modifier comprises the following components in percentage by mass: 32.86% of Al, 25.98% of CaO, 5.94% of Mn, 30.76% of Fe, and the balance of inevitable impurities.
Example 2:
a preparation method of an environment-friendly slag modifier comprises the following steps:
1) mixing manganese powder and iron powder in proportion by a spiral stirrer, uniformly mixing and loading into a charging bucket;
2) filling the passivated lime powder into another material tank;
3) placing the two material tanks at the core material blanking position of the core-spun yarn machine, and adding the materials to the pre-deformed aluminum strip in proportion;
4) the material is coated, pressed, molded and transmitted to a shearing machine through a core-spun yarn machine, and is sheared and compacted into finished particles according to specifications.
The cross section size phi of the finished product particles is 13mm, and the length of the finished product particles is 40 mm.
99 wt% of Mn in the manganese powder; the granularity of the manganese powder is less than or equal to 2 mm; the adding proportion of the manganese powder is 8 wt%;
94.7 wt% of Fe in the iron powder; the particle size of the iron powder is less than or equal to 2 mm; the adding proportion of the iron powder is 32 wt%;
CaO 91.68 wt% and S0.004 wt% in the passivated lime powder; the particle size of the passivated lime powder is less than or equal to 3 mm; the adding proportion of the passivated lime powder is 25 wt%;
99.6 wt% of aluminum strip Al; the specification thickness is 1mm, and the width is 55 mm; the addition ratio was 35%.
The finished product modifier comprises the following components in percentage by mass: 34.86% of Al, 22.92% of CaO, 7.92% of Mn7, 30.3% of Fe3% and the balance of inevitable impurities.
Example 3:
a preparation method of an environment-friendly slag modifier comprises the following steps:
1) mixing manganese powder and iron powder in proportion by a spiral stirrer, uniformly mixing and loading into a charging bucket;
2) filling the passivated lime powder into another material tank;
3) placing the two material tanks at the core material blanking position of the core-spun yarn machine, and adding the materials to the pre-deformed aluminum strip in proportion;
4) the material is coated, pressed, molded and transmitted to a shearing machine through a core-spun yarn machine, and is sheared and compacted into finished particles according to specifications.
The cross section size phi of the finished product particles is 15mm, and the length of the finished product particles is 40 mm.
99 wt% of Mn in the manganese powder; the granularity of the manganese powder is less than or equal to 2 mm; the adding proportion of the manganese powder is 9 wt%;
fe92.8wt% in iron powder; the particle size of the iron powder is less than or equal to 2 mm; the adding proportion of the iron powder is 30 wt%;
CaO 92.1 wt% and S0.0045 wt% in the passivated lime powder; the particle size of the passivated lime powder is less than or equal to 3 mm; the adding proportion of the passivated lime powder is 23 wt%;
99.6 wt% of aluminum strip Al; the specification thickness is 1mm, and the width is 60 mm; the proportion of addition was 38%.
The finished product modifier comprises the following components in percentage by mass: 37.84% of Al, 21.18% of CaO, 8.91% of Mn and 27.84% of FeI, and the balance of inevitable impurities.
Claims (3)
1. The preparation method of the environment-friendly slag modifier comprises the following components in percentage by mass: 30-40% of Al, 18-27% of CaO, 4-14% of Mn, 27-36% of Fe and the balance of inevitable impurities;
the preparation method is characterized by comprising the following steps:
1) mixing manganese powder and iron powder in proportion by a spiral stirrer, uniformly mixing and loading into a charging bucket;
2) filling the passivated lime powder into another material tank;
3) placing the two material tanks at the core material blanking position of the core-spun yarn machine, and adding the materials to the pre-deformed aluminum strip in proportion;
4) the material is coated, pressed, molded and transmitted to a shearing machine through a core-spun yarn machine, and is sheared and compacted into finished particles according to specifications;
the environment-friendly slag modifier is applied to smelting slag systems of IF steel, pipeline steel and steel converters for automobiles;
the metal aluminum strip replaces aluminum in aluminum scraps and aluminum ash, so that the reaction speed can be reduced, the heated gas is prevented from overflowing concentratedly, the scrap powder metal aluminum with too small granularity is prevented from being impacted by hot gas flow, and the utilization rate of aluminum is improved;
the core wrapping machine and the shearing machine are used for wrapping, shearing and compacting the materials, so that the forming target can be realized without adding a binding agent, the impurity carrying amount is reduced, and the production of clean steel is facilitated.
2. The preparation method of the environment-friendly slag modifier according to claim 1, wherein the cross-sectional dimension phi of the finished product particles is 9-15 mm, and the length of the finished product particles is 30-40 mm.
3. The method for preparing the environment-friendly slag modifier according to claim 1 or 2,
mn in the manganese powder is more than or equal to 99 wt%; the granularity of the manganese powder is less than or equal to 2 mm; the adding proportion of the manganese powder is 4-14 wt%;
fe in the iron powder is more than or equal to 90 wt%; the particle size of the iron powder is less than or equal to 2 mm; the adding proportion of the iron powder is 30-40 wt%;
CaO in the passivated lime powder is more than or equal to 90 wt%, and S is less than or equal to 0.05 wt%; the particle size of the passivated lime powder is less than or equal to 3 mm; the adding proportion of the passivated lime powder is 20-30 wt%;
the Al content of the aluminum strip is more than or equal to 99 wt%; the specification thickness is 0.8-1.2 mm, and the width is 45-60 mm; the adding proportion is 30 wt% -40 wt%.
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| CN104846150A (en) * | 2014-02-19 | 2015-08-19 | 宝山钢铁股份有限公司 | Method for smelting low-aluminium moulded steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104986373B (en) * | 2015-07-01 | 2017-10-13 | 杜先奎 | The process units of metallurgic auxiliary materials cored clamp dog |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05222428A (en) * | 1992-02-06 | 1993-08-31 | Nippon Steel Corp | Method for reforming slag |
| CN1084894A (en) * | 1992-09-29 | 1994-04-06 | 刘铁岭 | Purification of molten steel heating line feeding purifying method and purification heating cored-wire |
| CN101423880A (en) * | 2007-10-31 | 2009-05-06 | 鞍钢股份有限公司 | Modifier for ladle deoxidation and slag formation and method for producing the same |
| CN102146518A (en) * | 2011-04-02 | 2011-08-10 | 钢铁研究总院 | Refining agent for atmosphere protected electro-slag re-melting |
| CN103374642A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
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