CN100335440C - High-calcium low-iron magnesian dry method ramming mass and its production method - Google Patents
High-calcium low-iron magnesian dry method ramming mass and its production method Download PDFInfo
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- CN100335440C CN100335440C CNB2005100112084A CN200510011208A CN100335440C CN 100335440 C CN100335440 C CN 100335440C CN B2005100112084 A CNB2005100112084 A CN B2005100112084A CN 200510011208 A CN200510011208 A CN 200510011208A CN 100335440 C CN100335440 C CN 100335440C
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- powder
- ramming mass
- magnesite clinker
- electrosmelted magnesite
- steel
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- Compositions Of Oxide Ceramics (AREA)
Abstract
The present invention provides high-calcium low-iron magnesian dry method ramming mass, and a production method. The high-calcium low-iron magnesian dry method ramming mass is prepared from the following raw materials: calcined magnesium powder, lightly fured dolomite powder, fused magnesite, fused magnesite superfines, iron scale of steel rolling waste material, brown iron oxide of steel making byproduct and diesel oil. The present invention has good high temperature property, refractoriness under load, folding strength and shock resistance, high anti-slag erosion performance, and thin sintering layer on the furnace bottom. The present invention is especially suitable for the steel making new technology of replacing scrap steel by iron melt to be used as furnace charge. During the high temperature service process, the outstanding high temperature properties, such as high temperature resistance and high temperature flushing resistance, are kept, and the service life of the furnace bottom is prolonged so as to reduce consumption and enhance the steel making efficiency.
Description
Technical field
The present invention relates to fire resisting material field, relate in particular to unshape refractory, particularly the lining unshape refractory of pyrotic smelting container.
Background technology
It is the very important position of smelting equipment that steel-smelting electric furnace furnace bottom, ferroalloy smelting electric furnace furnace bottom and heat are converted a refining unit furnace bottom, the refractory materials quality of this place's usefulness be directly connected to steel-making rapidly and efficiently, the enforcement of high quality and low cost new technology, also be related to and avoid the safety in production of runout accident.
In the prior art, the working lining that steel-smelting electric furnace furnace bottom and ferroalloy smelting electric furnace and refining bag furnace bottom use mainly contains two big classes: a class is with at the bottom of the brick brickwork, mainly is with magnesia carbon brick and burning magnesia brick.The magnesia carbon brick thermal conductivity is big, and repairable is poor, causes work-ing life short, the cost height; It is poor to burn the magnesia brick thermal shock performance, and crackle peels off easily, and repairable is also poor, burns SiO in the anti-slag of magnesia brick
2Aggressiveness is poor, and the combined cause life-span is shorter.In addition, furnace bottom uses brick building, and not only material cost height, and labor strength is big, is a kind of than backward technology, uses less at present.
Another kind of is with low calcium (CaO6%-9%) high ferro (Fe
2O
35%-8%) magnesia dry method ramming mass carries out ramming.This ramming mass is with Fe
2O
3As agglutinant, Fe
2O
3Be a kind of non-refractory oxide, fusing point is 1576 ℃.With Fe
2O
3Allocating MgO-CaO into is in the material, Fe in sintering process
2O
3Generate 2CaOFe with free CaO (fCaO) reaction
2O
3(be C
2F, fusing point are 1449 ℃), impurities in raw materials A1
2O
3Generate 4CaOA1 with the fCaO reaction
2O
3Fe
2O
3I.e. (C
4AF, fusing point are 1415 ℃), more than two kinds of low melting point mineral C
2F and C
4AF promotes furnace bottom dry-tamping material sintering.Obviously, this furnace bottom ramming mass is to come acceleration of sintering by liquid phase.Contain Fe in the furnace burdening
2O
3Measure manyly more, the good more sintered layer of furnace burdening coking property is thick more, and the disadvantage of bringing simultaneously is that high-temperature behavior, load gentle voltinism, folding strength, thermal shock performance and the anti-slagging of retractory performance of flushing of furnace burdening is poor more, thereby the life of bottom is short more.In addition, Electric furnace steel making in order to reduce steel-making cost, save energy, is a raw material replacing steel scrap with molten iron all at present.Because the Si content in the molten iron is than high in the steel scrap, Si becomes SiO under the electric furnace oxidizing condition
2, erosion increases the weight of to furnace burdening, the variation of the therefore low high femic dry method of calcium ramming mass incompatibility steelmaking feed.
Summary of the invention
The object of the present invention is to provide a kind of high calcium low mafic dry process ramming mass, it can adapt to steel-making and use molten iron as main raw material, energy Fast Sintering, improve high-temperature behavior, slag resistance, thermal shock performance and the work-ing life of furnace bottom working lining greatly.Thereby overcome the shortcoming that prior art exists.
Another object of the present invention is to provide a kind of preparation method of high calcium low mafic dry process ramming mass.
The raw material that high calcium low mafic dry process ramming mass of the present invention uses is: light-burning magnesium powder, light dolomite powder, electrosmelted magnesite clinker, electrosmelted magnesite clinker super-fine powder, steel rolling scrap iron scale or steel-making byproduct brown iron oxide, diesel oil, and the chemical composition of high calcium low mafic dry process ramming mass and weight percent are formed and are comprised:
MgO 64-87％、
CaO 10-30％、
Fe
2O
3 0.5-4％，
SiO
2 0-1.2％，
A1
2O
3 0-0.5％，
Diesel oil is the 0-0.3% of raw material gross weight; The fineness of electrosmelted magnesite clinker super-fine powder≤10 μ m, average fineness≤1.5 μ m; The electrosmelted magnesite clinker granularity is 3-1mm, 1-0mm.
Its chemical composition and weight percent are preferably formed and are comprised:
MgO 68-86％、
CaO 12-25％、
Fe
2O
3 2-3.5％。
The CaO of high calcium low mafic dry process ramming mass content height of the present invention, Fe
2O
3Therefore content is low, has higher anti-scour property, and furnace bottom sintered layer is thinner, can prevent that like this furnace bottom from producing big crackle, avoiding the runout accident, improves furnace bottom work-ing life.CaO content is 10%-30%, Fe in the ramming mass of the present invention
2O
3Content is 0.5-4%, and CaO only is 6%-9% in the prior art, Fe
2O
3Content is 5-8%, so contain more free CaO (fCaO) in the furnace bottom ramming mass of the present invention.Has higher activity.CaO is easy to catch the SiO in the slag
2Because SiO
2+ fCaO → 2CaOSiO
2(be C
2S) or SiO
2+ fCaO → 3CaOSiO
2(be C
3S).C
2S and C
3S is a high melting compound, and slag viscosity is increased, and hinders slag and oozes deeply in furnace burdening, prevents that furnace bottom from continuing to be subjected to the slagging of retractory.Therefore especially to adapt to and replace steel scrap with molten iron be the steel-making technology of furnace charge in the present invention.
High calcium low mafic dry process ramming mass of the present invention uses the electrosmelted magnesite clinker super-fine powder as high temperature adhesives, therefore has higher high-temperature behavior, hot strength is big.Ramming mass of the present invention is based on solid state sintering, by the cohesion of super-fine powder, forms the direct combination of high temperature solid-state.Because super-fine powder particle diameter very little (average out to 1.53 μ m), activity is very big, has not only reduced the integral sintered temperature of ramming mass, also because the high rheological characteristics of super-fine powder drives coarse grained rheology, makes particle packing tightr, and it is more perfect that high fillibility is got rid of pore.Because the high cohesion of super-fine powder, the intensity of sintered layer is bigger.
Furnace bottom ramming mass of the present invention has used diesel oil, and it is attached to coarse grain raw material surface earlier in preparation process, and the electrosmelted magnesite clinker super-fine powder that the back is added is evenly distributed, and prevents size segregation.Diesel oil prevents super-fine powder aquation and moisture-proof role in addition simultaneously.
The present invention remains in the high temperature use has high temperature resistant, high temperature resistant excellent high-temperature behavior such as wash away, and has therefore improved the life of bottom, consumes thereby reduce, and improves steel-making efficient.
Preparation method's step of the present invention is as follows:
1. respectively with the raw material Raymond mill fine grinding of required light-burning magnesium powder, light dolomite powder, steel rolling scrap iron scale or steel-making byproduct brown iron oxide, make content 〉=95% of granularity≤0.088mm;
2. the raw material of above-mentioned fine grinding is put into edge runner-wet mill, and adds the water of 2-5%, mixing 10 minutes, becomes pug;
3. above-mentioned pug is sent into nodulizer, and pressure ball, the diameter of ball are 30-60mm, and stacks seasoning;
4. the above-mentioned ball of exsiccant is sent into the shaft furnace calcining, and calcining temperature is 1650-1750 ℃, is incubated 8-10 hour;
5. the ball after the above-mentioned calcining is sent into palate crusher, impact crusher carries out fragmentation, through multi-deck screen sieve powder, with a part wherein with the fine powder of ball mill abrasive particle degree≤0.088mm, with the 6-3mm, the 3-1mm that obtain, 1-0mm ,≤four kinds of powder separated deposit of 0.088mm;
6. above-mentioned four kinds of powders, electrosmelted magnesite clinker particle (3-1mm, 1-0mm), electrosmelted magnesite clinker super-fine powder carry out the tightst particle packing batching by the Andreassen equation, the powder of required above-mentioned four kinds of granularities and the electrosmelted magnesite clinker particle of two kinds of granularities are put into mixing roll, added required diesel oil preliminary mixing 5 minutes, add required electrosmelted magnesite clinker super-fine powder again, mixing again 8 minutes, to mixing, obtain finished product, pack then.
Embodiment
Ramming mass of the present invention is layered on the magnesia brick permanent layer of furnace bottom, and every layer thickness is 120-150mm, tamping repeatedly, and then add virgin material tamping again, up to reaching the design total thickness.Should use small power power supply when using first, molten clear before not oxygen blast, repeatedly carry out cold stoking, make the furnace bottom ramming mass that the sufficient time sintering be arranged, prevent to float.
The present invention uses in certain steel mill 100 tons of ultra high power direct current furnaces port bottom, and a life-span reaches 340 times, after suitably repairing, uses again 327 times, and comprehensive life is 667 times, and ton steel furnace burdening consumes 1.2kg/t.The present invention uses on 150 tons of ultra high power ac electric arc furnaces of certain steel mill, 50 tons of the every stove dress of this stove molten iron, and the present invention is compared with the prior art as follows: prior art furnace bottom ramming mass: maximum life span 305 times, ton steel furnace burdening consumes 1.05kg/t.Furnace bottom ramming mass of the present invention: maximum life span 385 times, ton steel furnace burdening consumes 0.86kg/t.The present invention uses on 70 tons of Kang Sidi electric furnaces of certain steel mill, the every stove dress of this stove molten iron about 1/3, and maximum life span reaches 545 stoves, and loss per ton steel is 1.1kg/t.
Embodiment 1
With light-burning magnesium powder (igloss≤3%, MgO 〉=94%, SiO
2≤ 0.8%) 600Kg, light dolomite powder (igloss≤15%, MgO 35-40%, CaO 40-48%, SiO
2≤ 0.6%) 350Kg, brown iron oxide (Fe
2O
3〉=80%, SiO
2≤ 1.5%) 50Kg, by 1-5 preparation in above-mentioned preparation method's step, wherein the 2nd step added water 40Kg, and wherein the diameter of ball is 30mm in the 3rd step, and wherein calcining temperature is 1650 ℃-1680 ℃ in the 4th step, is incubated 8 hours; Get then 6-3mm granularity powder 240Kg, 3-1mm granularity powder 184Kg, 1-0mm granularity powder 173Kg ,≤the fine powder 185Kg of 0.088mm, granularity is electrosmelted magnesite clinker (MgO 〉=97%, the SiO of 3-1mm
2≤ 1.5%, particle volume density 〉=3.45g/cm
3) 84Kg, granularity is the electrosmelted magnesite clinker 89Kg of 1-0mm, 20
#Diesel oil 3Kg, electrosmelted magnesite clinker super-fine powder (MgO 〉=97%, SiO
2≤ 1.5%, particle diameter≤10 μ m, median size≤1.53 μ m) 42Kg, 6 preparations set by step.
Embodiment 2
With light-burning magnesium powder (igloss≤12%, MgO 〉=78%, SiO
2≤ 0.6%, 720Kg CaO6-9%), light dolomite powder (igloss≤15%, MgO 35-40%, CaO 40-48%, SiO
2≤ 0.6%) 240Kg, brown iron oxide (Fe
2O
3〉=80%, SiO
2≤ 1.5%) 40Kg, by 1-5 preparation in above-mentioned preparation method's step, wherein the 2nd step added water 30Kg, and wherein the diameter of ball is 60mm in the 3rd step, and wherein calcining temperature is 1700 ℃-1750 ℃ in the 4th step, is incubated 10 hours; Get then 6-3mm powder 240Kg, 3-1mm powder 206Kg, 1-0mm powder 196Kg ,≤the fine powder 185Kg of 0.088mm, granularity is electrosmelted magnesite clinker (MgO 〉=97%, the SiO of 3-1mm
2≤ 1.5%, particle volume density 〉=3.45g/cm
3) 63Kg, granularity is the electrosmelted magnesite clinker 50Kg of 1-0mm, 20
#Diesel oil 3Kg, electrosmelted magnesite clinker super-fine powder (MgO 〉=97%, SiO
2≤ 1.5%, particle diameter≤10 μ m, median size≤1.53 μ m) 57Kg, 6 preparations set by step.
Embodiment 3
With light-burning magnesium powder (igloss≤12%, MgO 〉=78%, SiO
2≤ 0.6%, 470Kg CaO6-9%), light dolomite powder (igloss≤15%, MgO 35-40%, CaO 40-48%, SiO
2≤ 0.6%) 500Kg, iron scale powder (Fe
2O
3〉=80%, SiO
2≤ 1.5%) 30Kg, by 1-5 preparation in above-mentioned preparation method's step, wherein the 2nd step added water 50Kg, and wherein the diameter of ball is 40mm in the 3rd step, and wherein calcining temperature is 1680 ℃-1720 ℃ in the 4th step, is incubated 9 hours; Get then 6-3mm powder 240Kg, 3-1mm powder 221Kg, 1-0mm powder 196Kg ,≤the fine powder 185Kg of 0.088mm, granularity is electrosmelted magnesite clinker (MgO 〉=97%, the SiO of 3-1mm
2≤ 1.5%, particle volume density 〉=3.45g/cm
3) 48Kg, granularity is the electrosmelted magnesite clinker 30Kg of 1-0mm, 20
#Diesel oil 3.0Kg, electrosmelted magnesite clinker super-fine powder (MgO 〉=97%, the SiO of median size≤1.53 μ m
2≤ 1.5%, 77Kg particle diameter≤10 μ m), 6 preparations set by step.
Steel rolling scrap iron scale, steel-making byproduct brown iron oxide can go to buy to the phase shutout during the present invention was raw materials used, and other raw material can be bought in market.
Claims (3)
1. high calcium low mafic dry process ramming mass, the raw material that it is characterized in that high calcium low mafic dry process ramming mass is: light-burning magnesium powder, light dolomite powder, electrosmelted magnesite clinker, electrosmelted magnesite clinker super-fine powder, steel rolling scrap iron scale or steel-making byproduct brown iron oxide, diesel oil, and the chemical composition of high calcium low mafic dry process ramming mass and weight percent are formed and are comprised:
MgO 64-87％、
CaO 10-30％、
Fe
2O
3 0.5-4％，
SiO
2 0-1.2％，
Al
2O
3 0-0.5％，
Diesel oil is the 0-0.3% of raw material gross weight; The fineness of electrosmelted magnesite clinker super-fine powder≤10 μ m, average fineness≤1.5 μ m; The electrosmelted magnesite clinker granularity is 3-1mm and 1-0mm.
2. high calcium low mafic dry process ramming mass according to claim 1 is characterized in that:
MgO 68-86％、
CaO 12-25％、
Fe
2O
3 2-3.5％。
3. the preparation method of a high calcium low mafic dry process ramming mass is characterized in that preparation method's step is as follows:
(1) respectively with the raw material Raymond mill fine grinding of required light-burning magnesium powder, light dolomite powder, steel rolling scrap iron scale or steel-making byproduct brown iron oxide, makes content 〉=95% of granularity≤0.088mm;
(2) raw material of above-mentioned fine grinding is put into edge runner-wet mill, and adds the water of 2-5%, mixing 10 minutes, becomes pug;
(3) above-mentioned pug is sent into nodulizer, and pressure ball, the diameter of ball are 30-60mm, and stacks seasoning;
(4) the above-mentioned ball of exsiccant is sent into the shaft furnace calcining, and calcining temperature is 1650-1750 ℃, is incubated 8-10 hour;
(5) ball after the above-mentioned calcining is sent into palate crusher, impact crusher carries out fragmentation, through multi-deck screen sieve powder, with a part wherein with the fine powder of ball mill abrasive particle degree≤0.088mm, with the 6-3mm, the 3-1mm that obtain, 1-0mm ,≤four kinds of powder separated deposit of 0.088mm;
(6) above-mentioned four kinds of powders, granularity are that the electrosmelted magnesite clinker particle, electrosmelted magnesite clinker super-fine powder of 3-1mm and 1-0mm carries out the tightst particle packing batching by the Andreassen equation, the powder of required above-mentioned four kinds of granularities and the electrosmelted magnesite clinker particle of two kinds of granularities are put into mixing roll, added required diesel oil preliminary mixing 5 minutes, add required electrosmelted magnesite clinker super-fine powder again, mixing again 8 minutes, to mixing, obtain finished product, pack then.
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|---|---|---|---|
| CNB2005100112084A CN100335440C (en) | 2005-01-20 | 2005-01-20 | High-calcium low-iron magnesian dry method ramming mass and its production method |
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| CN100335440C true CN100335440C (en) | 2007-09-05 |
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Families Citing this family (12)
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| CN101182220B (en) * | 2006-11-14 | 2011-12-07 | 海城华宇耐火材料有限公司 | Smelting-furnace bottom tamping material and manufacturing method |
| CN100424042C (en) * | 2006-11-24 | 2008-10-08 | 辽宁中兴矿业集团有限公司 | Mafelsic ramming mass for copper smelting blast furnace |
| CN100398495C (en) * | 2006-11-24 | 2008-07-02 | 辽宁中兴矿业集团有限公司 | Environment-friendly composite tundish dry liner |
| CN101439980B (en) * | 2008-12-19 | 2011-06-08 | 河南省伯马股份有限公司 | Preparation of compact alkaline magnesium-calcium synthetic material |
| CN101555155B (en) * | 2009-05-27 | 2012-01-04 | 攀枝花学院 | Dry type ramming material for continuous casting tundish |
| CN102167607B (en) * | 2011-01-27 | 2013-03-13 | 营口鲅鱼圈耐火材料有限公司 | Dolomite non-burning carbon brick and preparation method thereof |
| CN102718508A (en) * | 2012-02-23 | 2012-10-10 | 沈恩有 | Application of magnesite composite material preparation method in nickel-iron high carbon ferrochrome production by submerged arc furnace |
| PT2933236T (en) | 2014-04-15 | 2016-07-26 | Refractory Intellectual Property Gmbh & Co Kg | Refractory ceramic formulation, use of such a formulation and a metallurgical melting vessel |
| CN106518022B (en) * | 2016-10-28 | 2019-08-16 | 北京利尔高温材料股份有限公司 | A kind of preparation method of magnesia synthetic material |
| CN106542836B (en) * | 2016-11-03 | 2020-03-17 | 海城市中兴镁质合成材料有限公司 | Electric furnace bottom ramming material for synthesizing magnesium-calcium-iron sand by taking waste magnesium-calcium bricks as raw materials |
| CN114031373A (en) * | 2021-11-28 | 2022-02-11 | 海城利尔麦格西塔材料有限公司 | Electric furnace bottom ramming material |
| CN117125959B (en) * | 2023-09-14 | 2024-06-11 | 大石桥市晟华耐火材料有限公司 | Preparation method of thermal shock resistant composite magnesium powder ramming mass |
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