CN103994663B - A kind of method extending medium-frequency induction furnace lining durability - Google Patents
A kind of method extending medium-frequency induction furnace lining durability Download PDFInfo
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- CN103994663B CN103994663B CN201410258241.6A CN201410258241A CN103994663B CN 103994663 B CN103994663 B CN 103994663B CN 201410258241 A CN201410258241 A CN 201410258241A CN 103994663 B CN103994663 B CN 103994663B
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Abstract
The invention provides a kind of method extending medium-frequency induction furnace lining durability, comprise the steps: 1) select refractory material the granularity determining refractory material and proportioning after, mixing, adds boric acid and water mixing is stand-by; 2) spread asbestos board in the bottom of body of heater, the inwall of body of heater places asbestos cloth, and is pressed on inboard wall of furnace body by asbestos cloth fixing tight with turn; 3) furnace lining compound is added on asbestos board, and evenly tamping, form furnace lining diapire; 4) again metallic crucible model is placed in body of heater, determine body of heater center, insert furnace lining compound in the outer ring of metallic crucible and tamping layer by layer, form furnace lining inwall, then make stove neck and converter nose; 5) take out metallic crucible model, furnace lining diapire, furnace lining inwall, stove neck and converter nose are brushed through water-reducible waterglass, natural drying 24 hours; 6) sintered lining diapire and furnace lining inwall.The method improves the elevated temperature strength of medium-frequency induction furnace furnace lining, extends the life-span of medium-frequency induction furnace furnace lining.
Description
Technical field
The present invention relates to medium-frequency induction furnace field, be specifically related to a kind of method extending medium-frequency induction furnace lining durability.
Background technology
Medium-frequency induction furnace because of its burn-off rate fast, metallic solution temperature is high, and chemical composition is even, the advantages such as simple and convenient operation and maintenance, application in modern foundry enterprise widely, and progressively keeps the large-scale development, and the melting of various cast iron, cast steel and non-ferrous alloy can use.The furnace lining of medium-frequency induction furnace is the important process parts of medium-frequency induction furnace, the inductor of high-temperature molten steel and stove is kept apart by it, and the high temperature action (>=1500 DEG C) born in fusion process, due to severe impact and the collision of furnace charge when furnace lining in use often feeds in raw material, during melting, the stirring action of electromagnetism can cause molten metal to the violent scour of furnace lining, slag makes temperature of furnace lining produce quenching to the chemical erosion of furnace lining and interruption operation, during shock heating change, therefore larger to the damageability of furnace lining, furnace lining is cracked, corrode, peel off, molten metal poke can be caused time serious to serve as a contrast and cause leak accident.
And the high-temperature behavior of medium-frequency induction furnace furnace lining depends primarily on the physics of refractory material used, chemical property and mineral composition, under the prerequisite that refractory material is selected, sintering process makes furnace lining obtain good microstructure to give full play to the critical process of its resistance to elevated temperatures.The densification degree of lining sintering is relevant with factors such as the chemical composition of refractory material, grain size proportion, sintering process and sintering temperatures, therefore the present invention is entrance from the selection of refractory material, furnace building process and sintering process, studies a kind of method extending medium-frequency induction furnace lining durability.
Summary of the invention
In order to solve prior art Problems existing, the invention provides a kind of method extending medium-frequency induction furnace lining durability, the method is by the selection of refractory material, the granularity of adjustment refractory material and proportioning parameter, the improvement of furnace building process and sintering process, improve the elevated temperature strength of medium-frequency induction furnace furnace lining, thus extend the life-span of medium-frequency induction furnace furnace lining.
In order to achieve the above object, the technical solution adopted in the present invention is:
Extend a method for medium-frequency induction furnace lining durability, comprise the steps:
1) after selecting refractory material the granularity determining refractory material and proportioning, mixing, again mixes after adding boric acid, then adds water and mixes to obtain furnace lining compound, built by the wet gunnysack of furnace lining compound, placement 20-30 minute, stand-by;
2) medium-frequency induction furnace has body of heater, body of heater comprises stove outer covering and is placed in the induction coil of stove outer covering inside, spread asbestos board in the bottom of body of heater, the inwall that the inwall of body of heater and induction coil surround places asbestos cloth, and is pressed on inboard wall of furnace body by asbestos cloth fixing tight with turn;
3) furnace lining compound is added on asbestos board, and evenly tamping, form furnace lining diapire;
4) again metallic crucible model is placed in body of heater, determine body of heater center, insert furnace lining compound in the outer ring of metallic crucible and tamping layer by layer, form furnace lining inwall, then make stove neck and converter nose;
5) take out metallic crucible model, furnace lining diapire, furnace lining inwall, stove neck and converter nose are brushed through water-reducible waterglass, natural drying 24 hours;
6) sintered lining diapire and furnace lining inwall.
Preferably, step 1) in refractory material be fused magnesite, fused magnesite granularity, proportioning and boric acid addition by weight ratio be,
Preferably, in above-mentioned fused magnesite, magnesian content is more than or equal to 90%, and not containing low-melting impurities and conductive magnetic properties impurity.
Preferably, step 2) in spread asbestos board and make the bottom thickness of body of heater increase 6-8mm, place asbestos cloth and make inboard wall of furnace body thickness increase 6-8mm.
Preferably, step 3) in the thickness of furnace lining diapire be 50-70mm.
Preferably, step 4) in the thickness of furnace lining inwall be 40-60mm.
Preferably, step 6) be specially, in the cavity formed by furnace lining diapire and furnace lining inwall, block-by-block adds cast iron furnace charge, surrounding and the furnace lining inwall of cast iron furnace charge keep 5-10mm gap, open medium-frequency induction furnace, make cast iron load melting, continue to add cast iron furnace charge in the molten metal after fusing, it is made to melt the upper edge of rear metal bath surface to furnace lining inwall, after carrying out low temperature to high temperature sintering, pour out molten metal, clean out rear inspection furnace lining flawless, damage, the defect such as drop time, just can put into production.
Preferably, above-mentioned low temperature to high temperature sintering divides 5 stages, low temperature first stage intensification power 20kw, keep 40min, low temperature second stage intensification power 40kw, keeps 40min, high temperature phase III intensification power 60kw, keep 40min, high temperature fourth stage intensification power 80kw, keeps 60min, high temperature five-stage intensification power 100kw, keep 60min, temperature is risen to 1500 DEG C ~ 1550 DEG C insulations 30 minutes by the peak power of opening medium-frequency induction furnace afterwards.
Preferably, the molten weight metal of medium-frequency induction furnace in said method is 100-150kg.
The present invention has following beneficial effect:
1, extend medium-frequency induction furnace basic-lined service life, solve leak accident, improve furnace lining intensity, make furnace lining crackle, the tendency of drop postpones and reduce, improve quality of molten metal, reduce the generation of slag inclusion, sand holes defect.
2, by limiting granularity and the proportioning parameter of fused magnesite, the intensity of furnace lining compound can be improved, reducing molten steel and washing away furnace wall in fusion process, and causing furnace wall drop damage, if be rolled onto in molten steel, will dreg defect be caused.
3, the thickness of furnace lining diapire is 50-70mm, and the thickness of furnace lining inwall is 40-60mm.This thickness is applicable to the stove that medium-frequency induction furnace capacity is 100-150kg, and furnace lining has higher conductivity of heat to reduce thermal loss to select such thickness both to ensure that, has again enough intensity bear the weight of molten steel and be not fused.
4, by the sintering in 5 stages, be conducive to the effusion of water and knot intercrystalline water in furnace lining material, be conducive to furnace lining material and form the sinter layer, transition zone and the unconsolidated formation that respectively account for 1/3 thickness from the inside to the outside, so not only ensure that furnace lining has certain high temperature resistance erosiveness, can ensure that again it has good intensity and toughness.
5, the inventive method makes furnace lining have good micro texture, gives full play to the resistant to elevated temperatures performance of furnace lining.
Accompanying drawing explanation
Fig. 1 is medium-frequency induction furnace furnace lining process schematic representation in the present invention.
1-metallic crucible model, 2-asbestos cloth, 3-asbestos board, 4-furnace lining compound, 5-furnace lining inwall, 6-furnace lining diapire, 7-body of heater, 8-stove is led, 9-converter nose.
Detailed description of the invention
Embodiment, a kind of method extending medium-frequency induction furnace lining durability
Select melted weight metal to be 100-150kg medium-frequency induction furnace, the method extending this medium-frequency induction furnace lining durability specifically comprises the steps:
1) select refractory material, refractory material should have enough mechanical strengths and resistance to fire intensity; Good chemical stability: resistance to thermal shocks preferably; Low thermal conductivity and good electrical insulating property.The refractory material selected in the present embodiment is fused magnesite, and in this fused magnesite, magnesian content is more than or equal to 90%, and not containing low-melting impurities and conductive magnetic properties impurity.Cosolvent is boric acid, and wetting agent is water, and it is as follows by weight ratio,
By granularity and the proportioning mixing of above-mentioned fused magnesite, then said ratio adds boric acid mixing, finally adds appropriate water, again mixes to obtain furnace lining compound 4, built by the wet gunnysack of furnace lining compound 4, places 20-30 minute, stand-by.
2) medium-frequency induction furnace has body of heater 7, and body of heater 7 comprises stove outer covering and is placed in the induction coil of stove outer covering inside, spreads asbestos board 3 in the bottom of body of heater 7, makes body of heater 7 bottom thickness increase 6-8mm; The inwall that the inwall of body of heater 7 and induction coil surround places asbestos cloth 2, makes body of heater 7 inner wall thickness increase 6-8mm, and is pressed on body of heater 7 inwall by asbestos cloth 2 fixing tight with turn.
3) furnace lining compound 4 is added on asbestos board 3, and evenly tamping, form furnace lining diapire 6, add furnace lining compound 4 layered to add, before adding lower one deck furnace lining compound 4, now front one deck is smash tight furnace lining compound 4 strokes of pines, to strengthen the combination between each layer, till the thickness of furnace lining diapire 6 reaches 50-70mm.
4) again metallic crucible model 1 is placed in body of heater 7, determine body of heater 7 center, insert furnace lining compound 4 in the outer ring of metallic crucible model 1 and tamping layer by layer, form furnace lining inwall 5, the thickness of guarantee furnace lining inwall 5 is 40-60mm, then makes stove neck 8 and converter nose 9;
5) take out metallic crucible model 1, furnace lining diapire 6, furnace lining inwall 5, stove neck 8 and converter nose 9 are brushed through water-reducible waterglass, natural drying 24 hours.
6) sintered lining diapire 6 and furnace lining inwall 5.In the cavity formed by furnace lining diapire 6 and furnace lining inwall 5, block-by-block adds cast iron furnace charge, surrounding and the furnace lining inwall 5 of cast iron furnace charge keep 5-10mm gap, open medium-frequency induction furnace, make cast iron load melting, continue to add cast iron furnace charge in the molten metal after fusing, make it melt the upper edge of rear metal bath surface to furnace lining inwall 5, after carrying out low temperature to high temperature sintering, pour out molten metal, clean out rear inspection furnace lining flawless, damage, the defect such as drop time, just can put into production.
Low temperature to high temperature sintering divides 5 stages, low temperature first stage intensification power 20kw, keeps 40min, low temperature second stage intensification power 40kw, keep 40min, high temperature phase III intensification power 60kw, keeps 40min, high temperature fourth stage intensification power 80kw, keep 60min, high temperature five-stage intensification power 100kw, keeps 60min, insulation 30 minutes after temperature is risen to 1500 DEG C ~ 1550 DEG C by the peak power of opening medium-frequency induction furnace afterwards.
The later maintenance of furnace lining, in actual charging process, in order to prevent being broken by furnace lining, avoid directly dropping in stove by heavier furnace charge, before dress bulk furnace charge 3, should fill some less furnace charges at furnace bottom; In load melting process, want diligent observation, avoid scaffold and get stuck, reduce furnace charge to the impact of furnace wall, furnace bottom.If comparatively catastrophe failure or power failure appear in switch board, metal integral condensation in stove should be prevented in time by metal charge or molten metal everywhere.If stove is not continuous use, after once using, some metal charges to being added in stove, preventing because cooling precocity furnace lining crackle fast.Medium-frequency induction furnace in fusion process at the bottom of furnace lining and wall be easy to be corroded and come off, if not when very serious, by suitable for furnace building material damping, furnace bottom impurity can be removed rear shovel and enters furnace bottom, carry out " vulcanizing " with compactor tamping.
Claims (7)
1. extend a method for medium-frequency induction furnace lining durability, it is characterized in that comprising the steps:
1) after selecting refractory material the granularity determining refractory material and proportioning, mixing, again mixes after adding boric acid, then adds water and mixes to obtain furnace lining compound, built by the wet gunnysack of furnace lining compound, placement 20-30 minute, stand-by;
2) medium-frequency induction furnace has body of heater, body of heater comprises stove outer covering and is placed in the induction coil of stove outer covering inside, spread asbestos board in the bottom of body of heater, the inwall that the inwall of body of heater and induction coil surround places asbestos cloth, and is pressed on inboard wall of furnace body by asbestos cloth fixing tight with turn;
3) furnace lining compound is added on asbestos board, and evenly tamping, form furnace lining diapire;
4) again metallic crucible model is placed in body of heater, determine body of heater center, insert furnace lining compound in the outer ring of metallic crucible and tamping layer by layer, form furnace lining inwall, then make stove neck and converter nose;
5) take out metallic crucible model, furnace lining diapire, furnace lining inwall, stove neck and converter nose are brushed through water-reducible waterglass, natural drying 24 hours;
6) sintered lining diapire and furnace lining inwall, in the cavity formed by furnace lining diapire and furnace lining inwall, block-by-block adds cast iron furnace charge, surrounding and the furnace lining inwall of cast iron furnace charge keep 5-10mm gap, open medium-frequency induction furnace, make cast iron load melting, continue to add cast iron furnace charge in the molten metal after fusing, make it melt the upper edge of rear metal bath surface to furnace lining inwall, after carrying out low temperature to high temperature sintering, remove molten metal;
Low temperature to high temperature sintering divides 5 stages, low temperature first stage intensification power 20kw, keeps 40min, low temperature second stage intensification power 40kw, keep 40min, high temperature phase III intensification power 60kw, keeps 40min, high temperature fourth stage intensification power 80kw, keep 60min, high temperature five-stage intensification power 100kw, keeps 60min, and temperature is risen to 1500 DEG C ~ 1550 DEG C insulations 30 minutes by the peak power of opening described medium-frequency induction furnace afterwards.
2. method according to claim 1, is characterized in that, step 1) in refractory material be fused magnesite, fused magnesite granularity, proportioning and boric acid addition by weight ratio be,
3. method according to claim 2, is characterized in that, in described fused magnesite, magnesian content is more than or equal to 90%, and not containing low-melting impurities and conductive magnetic properties impurity.
4. method according to claim 1, is characterized in that, step 2) in spread asbestos board make bottom of furnace body thickness increase 6-8mm, place asbestos cloth make inboard wall of furnace body thickness increase 6-8mm.
5. method according to claim 1, is characterized in that, step 3) in the thickness of furnace lining diapire be 50-70mm.
6. method according to claim 1, is characterized in that, step 4) in the thickness of furnace lining inwall be 40-60mm.
7., according to the arbitrary described method of claim 1-6, it is characterized in that, the molten weight metal of described medium-frequency induction furnace is 100-150kg.
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| CN104534877A (en) * | 2014-12-18 | 2015-04-22 | 本钢板材股份有限公司 | Composition used for manufacturing crucible of medium-frequency induction furnace |
| CN104713364A (en) * | 2015-02-25 | 2015-06-17 | 托普工业(江苏)有限公司 | Medium-frequency inductance electricity molten steel leakage preventing method |
| CN105177598A (en) * | 2015-10-15 | 2015-12-23 | 杭州科德磁业有限公司 | Technique for grain boundary diffusion of heavy rare earth of neodymium-iron-boron magnet |
| CN106187122A (en) * | 2016-06-29 | 2016-12-07 | 焦作金鑫恒拓新材料股份有限公司 | A kind of intermediate frequency aluminium melting furnace furnace lining dry materials |
| CN108061464A (en) * | 2017-12-08 | 2018-05-22 | 首钢集团有限公司 | A kind of vacuum drying oven crucible knotting method |
| CN110567270A (en) * | 2019-08-26 | 2019-12-13 | 贵州安吉航空精密铸造有限责任公司 | Molten metal casting smelting system and installation method thereof |
| CN111023806A (en) * | 2019-11-25 | 2020-04-17 | 包头钢铁（集团）有限责任公司 | Preparation method of crucible for 25kg vacuum induction furnace |
| CN111664709A (en) * | 2020-06-09 | 2020-09-15 | 昆山市昌坚铸造有限公司 | Method for repairing bottom of electric furnace for casting |
| CN114353529A (en) * | 2022-01-12 | 2022-04-15 | 新疆八钢佳域工业材料有限公司 | Furnace lining baking method for zinc melting intermediate frequency furnace |
| CN114688880A (en) * | 2022-03-25 | 2022-07-01 | 滨州市宏诺新材料有限公司 | Furnace building method capable of prolonging service life of intermediate frequency furnace |
| CN117902881A (en) * | 2024-03-20 | 2024-04-19 | 锦州恒泰特种合金有限公司 | Composite refractory material for ferrotitanium vacuum smelting ramming furnace lining and application thereof |
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