CN102994768B - Electro-slag re-melting slag and preparation method thereof - Google Patents
Electro-slag re-melting slag and preparation method thereof Download PDFInfo
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- CN102994768B CN102994768B CN201210285609.9A CN201210285609A CN102994768B CN 102994768 B CN102994768 B CN 102994768B CN 201210285609 A CN201210285609 A CN 201210285609A CN 102994768 B CN102994768 B CN 102994768B
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Abstract
The invention provides electro-slag re-melting slag, consisting of the following components in percentage by weight: 20%-25% of fluorite, 35%-40% of bauxite, 30%-35% of high-calcium lime, 3%-8% of fused magnesite and 5%-10% of silica. A preparation method of the electro-slag re-melting slag comprises the following process steps of checking, finely grinding, proportioning, balling, drying, electrically smelting, deslagging, cooling, crashing, checking, packaging and storing. The electro-slag re-melting slag provided by the invention can be used for reducing the introduction of hydrogen, oxygen and nitrogen, and has the advantages of ensuring the surface smoothness of cast ingots and low power consumption.
Description
Technical field
The invention belongs to metallurgic auxiliary materials technical field, relate to a kind of electro slag remelting slag, the invention still further relates to the preparation method of this electro slag remelting slag.
Background technology
At present, at metallurgy industry, conventional electro slag remelting slag is binary slag system and ternary slag system.Binary slag system is molten is CaF
2-TiO
2slag, it represents that composition is CaF
270%+Al
2o
330%.This slag for comprehensive processing performance is better, adapts to different technology conditions, has certain desulfurization and goes to be mingled with ability, is applicable to remelting ball bearing stee, structural alloy steel, rapid tool steel, die steel and stainless refractory steel etc.But this slag exists some shortcomings, if slag ingredient is not on low melting eutectics point, fusing point is higher; The specific conductivity of slag is high, and remelting power consumption is high; CaF in slag
2content is high, easy contaminate environment in melting; Steel inclusion be take fragility aluminate and corundum as main, affects the plasticity of steel and toughness etc.For fear of CaF
2-Al
2o
3the above-mentioned shortcoming of slag system, has developed CaF in recent years
2-CaO-Al
2o
3ternary slag system, CaF
2-CaO-Al
2o
3-MgO quaternary slag system and CaF
2-CaO-Al
2o
3-MgO-SiO
2five yuan of slag systems etc.The composition of these slag systems is chosen on ternary eutectic line substantially, and the fusing point of slag is lower, and when slag crust solidifies, segregation phenomena is slighter, and slag ingredient is stable, ingot casting any surface finish, and moulding is good.And these slag systems have lower specific conductivity, improved electrical efficiency, because of CaF in slag
2reduce, the pollution causing also alleviates to some extent, contains a small amount of MgO or SiO in slag
2, prevented that molten steel is air-breathing, make ingot casting any surface finish.The shortcoming of these slag systems is to contain CaO, is easy to water suction, therefore must pay close attention to and keep the dry of slag charge, to prevent the oxygenation of molten steel suction hydrogen.
Summary of the invention
Technical problem to be solved by this invention is to provide that a kind of remelting slag system is stable, ingot casting smooth surface, product ingredient stability homogeneous, electro slag remelting slag that current consumption is low, and another technical problem to be solved by this invention is to provide the preparation method of this electro slag remelting slag.
For solving the problems of the technologies described above, to be designed electro slag remelting slag be comprised of the raw material of following weight percent the technical solution used in the present invention:
Fluorite 20-25%, bauxitic clay 35-40%, high calcium lime 30-35%, electrosmelted magnesite clinker 3-8%, silica 5-10%;
In above-mentioned each raw material, C in fluorite
af
2content>=95%, S
io
2content≤2%, P content≤0.05%, S content≤0.05%, granularity is 15-20mm; Al in bauxitic clay
2o
3content>=97%, granularity≤0.5mm; C in high calcium lime
ao content>=90%, S
io
2content≤2.5%, P content≤0.05%, S content≤0.05%, granularity is 10-50mm; M in electrosmelted magnesite clinker
go content>=95%, S
io
2content≤2%, P content≤0.01%, S content≤0.01%, granularity is 3-5mm; S in silica
io
2content>=95%, granularity is 1-5mm.
The preparation technology of electro slag remelting slag of the present invention is:
(1). check: every kind of starting material are checked out to satisfactory starting material by the requirement of moiety content separately;
(2). fine grinding: it is fine powders more than 100 orders that satisfactory each starting material of check are made to granularity by crusher, Raymond mill;
(3). proportioning: above-mentioned each fine powder is mixed by composition and ratio;
(4). ball processed: mixed raw material is made to the ball that granularity is 10-30mm through dry-pressing apparatus for making pearl ball;
(5). dry: the ball that is 10-30mm to the above-mentioned granularity making toasts;
(6). electric smelting: to putting into Medium Frequency Induction Heating Furnace high temperature melting through the ball of overbaking, make it form homogeneous, stable Composite burden;
(7). slag tap:
(8). cooling: to pour above-mentioned Composite burden in furnace charge basin naturally cooling;
(9). fragmentation: cooled furnace charge is broken, sub-sieve, make the product that granularity is 2-8mm;
(10). check: the said products is tested;
(11). packing: the product being up to the standards is packed;
(12). warehouse-in: the product warehousing after packing is deposited.
The advantage of electro slag remelting slag product performance of the present invention:
(1) this slag is through special processing, and moisture resistance is strong, is difficult for hydration occurs, thereby has reduced bringing into of hydrogen, oxygen;
(2) this slag is pressed proportioning, fritting after first homogenizing, and physics, Chemical Composition are stablized, and ventilation property is little, has reduced bringing into of nitrogen;
(3) different according to steel grade, make suitable electrical conductivity materials, reduce power consumption, save steel-making cost.
Embodiment
Electro slag remelting slag of the present invention is comprised of the raw material of following weight percent:
Fluorite 20-25%, bauxitic clay 35-40%, high calcium lime 30-45%, electrosmelted magnesite clinker 3-8%, silica 5-10%.
In each raw material of the electro slag remelting slag that the present invention makes, moiety content and the granularity requirements of every kind of raw material are as shown in the table:
Embodiment 1
Electro slag remelting slag of the present invention is comprised of the raw material of following weight percent:
Fluorite 20%, bauxitic clay 40%, high calcium lime 30%, electrosmelted magnesite clinker 5%, silica 5%.
Its preparation method is:
(1). check: every kind of starting material are checked out to satisfactory starting material by the requirement of moiety content separately;
(2). fine grinding: it is fine powders more than 100 orders that satisfactory each starting material of check are made to granularity by crusher, Raymond mill;
(3). proportioning: above-mentioned each fine powder is mixed by composition and ratio;
(4). ball processed: mixed raw material is made to the ball that granularity is 10-30mm through dry-pressing apparatus for making pearl ball;
(5). dry: the ball that is 10-30mm to the above-mentioned granularity making toasts;
(6). electric smelting: to putting into Medium Frequency Induction Heating Furnace high temperature melting through the ball of overbaking, make it form homogeneous, stable Composite burden;
(7). slag tap;
(8). cooling: to pour above-mentioned Composite burden in furnace charge basin naturally cooling;
(9). fragmentation: cooled furnace charge is broken, sub-sieve, make the product that granularity is 2-8mm;
(10). check: the said products is tested;
(11). packing: the product being up to the standards is packed;
(12). warehouse-in: the product warehousing after packing is deposited.
Embodiment 2
Electro slag remelting slag of the present invention is comprised of the raw material of following weight percent:
Fluorite 20%, bauxitic clay 35%, high calcium lime 30%, electrosmelted magnesite clinker 5%, silica 10%.
Its preparation method is with embodiment 1.
Embodiment 3
Electro slag remelting slag of the present invention is comprised of the raw material of following weight percent:
Fluorite 25%, bauxitic clay 35%, high calcium lime 30%, electrosmelted magnesite clinker 5%, silica 5%.
Its preparation method is with embodiment 1.
Embodiment 4
Electro slag remelting slag of the present invention is comprised of the raw material of following weight percent:
Fluorite 20%, bauxitic clay 35%, high calcium lime 35%, electrosmelted magnesite clinker 5%, silica 5%.
Its preparation method is with embodiment 1.
Embodiment 5
Electro slag remelting slag of the present invention is comprised of the raw material of following weight percent:
Fluorite 22%, bauxitic clay 36%, high calcium lime 32%, electrosmelted magnesite clinker 3%, silica 7%.
Its preparation method is with embodiment 1.
Electro slag remelting slag of the present invention is with lime, bauxitic clay, fluorite, electrosmelted magnesite clinker, wollastonite raw material, adopt homogenization installation to be fully mixed and made into pelletizing to the raw material of different varieties, and melt in electromagnetic induction furnace, make the abundant physical reaction that occurs between raw material, the product composition produced is more stable, homogeneous, and has suitable specific conductivity, fusing point, viscosity, surface tension etc.Commercial test results shows: 1. it is resistance heat electric energy conversion, and metal electrode relies on the resistance heat of slag to melt, and meets the needs of smelting temperature; When 2. in reflow process, molten metal forms metal drop through slag bath, slag and molten drop contact area increase, utilize the chemical property of slag can effectively remove harmful element sulphur, phosphorus etc. in steel, remove obnoxious flavour hydrogen, oxygen, nitrogen etc., absorb, dissolve the non-metallic inclusion at molten metal and slag interface, make metal be purified, purify; 3. it forms one deck slag crust between ingot casting and crystallizer, this layer of slag crust played insulation, heat insulation, lubrication, metal is not directly contacted with crystallizer, prevented electric shunting, hot-fluid is mainly conducted to end water tank direction, crystallization tends to y direction, and is conducive to the relative movement of ingot casting and crystallizer wall.In addition, the melting slag bath above metal pool makes molten metal avoid directly contacting with atmosphere, has played and has prevented burning and store hot insulation effect.In esr process, metal melts, solidifies all the time under slag coated.Steel purity through esr is high, sulfur-bearing is low, non-metallic inclusion is few, surface of steel ingot is smooth, clean even compact, metallographic structure and chemical composition even.
Claims (1)
1. an electro slag remelting slag, is characterized in that being comprised of the raw material of following weight percent:
Fluorite 20%, bauxitic clay 40%, high calcium lime 30%, electrosmelted magnesite clinker 5%, silica 5%;
In above-mentioned each raw material, CaF in fluorite
2content>=95%, SiO
2content≤2%, P content≤0.05%, S content≤0.05%, granularity is 15-20mm; Al in bauxitic clay
2o
3content>=97%, granularity≤0.5mm; CaO content>=90% in high calcium lime, SiO
2content≤2.5%, P content≤0.05%, S content≤0.05%, granularity is 10-50mm; MgO content>=95% in electrosmelted magnesite clinker, SiO
2content≤2%, P content≤0.01%, S content≤0.01%, granularity is 3-5mm; SiO in silica
2content>=95%, granularity is 1-5mm;
Described electro slag remelting slag is to adopt following methods preparation:
(1). check: every kind of starting material are checked out to satisfactory starting material by the requirement of moiety content separately;
(2). fine grinding: it is fine powders more than 100 orders that satisfactory each starting material of check are made to granularity by crusher, Raymond mill;
(3). proportioning: above-mentioned each fine powder is mixed by composition and ratio;
(4). ball processed: mixed raw material is made to the ball that granularity is 10-30mm through dry-pressing apparatus for making pearl ball;
(5). dry: the ball that is 10-30mm to the above-mentioned granularity making toasts;
(6). electric smelting: to putting into Medium Frequency Induction Heating Furnace high temperature melting through the ball of overbaking, make it form homogeneous, stable Composite burden;
(7). slag tap:
(8). cooling: to pour above-mentioned Composite burden in furnace charge basin naturally cooling;
(9). fragmentation: cooled furnace charge is broken, sub-sieve, make the product that granularity is 2-8mm;
(10). check: the said products is tested;
(11). packing: the product being up to the standards is packed;
(12). warehouse-in: the product warehousing after packing is deposited.
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|---|---|---|---|
| CN201210285609.9A CN102994768B (en) | 2012-08-13 | 2012-08-13 | Electro-slag re-melting slag and preparation method thereof |
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| CN201210285609.9A CN102994768B (en) | 2012-08-13 | 2012-08-13 | Electro-slag re-melting slag and preparation method thereof |
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| CN102994768A CN102994768A (en) | 2013-03-27 |
| CN102994768B true CN102994768B (en) | 2014-04-02 |
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| CN103233131A (en) * | 2013-05-08 | 2013-08-07 | 武汉钢铁(集团)公司 | Electroslag remelting slag for smelting plastic mould steel and preparation method thereof |
| CN105714125A (en) * | 2016-03-09 | 2016-06-29 | 西峡龙成冶金材料有限公司 | Electroslag remelting slag and production technology thereof |
| CN105950883B (en) * | 2016-06-24 | 2017-12-08 | 东北大学 | A kind of electroslag remelting gas nitriding that pressurizes prepares the slag system of high nitrogen martensitic stain less steel |
| CN105936978B (en) * | 2016-06-24 | 2017-12-29 | 东北大学 | A kind of electroslag remelting gas nitriding that pressurizes prepares the slag system of high-nitrogen austenitic stainless steel |
| CN108034834B (en) * | 2017-11-14 | 2019-10-18 | 邢台钢铁有限责任公司 | A kind of production method of small lot electroslag remelting pre-melted slag |
| CN109604565A (en) * | 2018-12-24 | 2019-04-12 | 湖南三泰新材料股份有限公司 | A kind of device and preparation method of electroslag melting stainless steel composite base |
| CN111187918B (en) * | 2020-01-22 | 2022-08-26 | 上海电气上重铸锻有限公司 | Control method for nonmetallic inclusions in 9Ni steel ingot with weight of more than 30 tons |
| CN111378848B (en) * | 2020-04-07 | 2022-03-15 | 中国航发北京航空材料研究院 | Pre-melted slag for electroslag remelting for improving purity of GH4169 alloy return and preparation method thereof |
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