CN102167607B - Dolomite non-burning carbon brick and preparation method thereof - Google Patents

Dolomite non-burning carbon brick and preparation method thereof Download PDF

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Publication number
CN102167607B
CN102167607B CN 201110029833 CN201110029833A CN102167607B CN 102167607 B CN102167607 B CN 102167607B CN 201110029833 CN201110029833 CN 201110029833 CN 201110029833 A CN201110029833 A CN 201110029833A CN 102167607 B CN102167607 B CN 102167607B
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rhombspar
dolomite
calcining
carbon brick
synthesized high
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CN102167607A (en
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周清德
周晨光
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YINGKOU BAYUQUAN REFRACTORY MATERIAL CO Ltd
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YINGKOU BAYUQUAN REFRACTORY MATERIAL CO Ltd
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Abstract

The invention relates to a dolomite non-burning carbon brick and a preparation method thereof. In the invention, calcined synthetic high-iron dolomite which is not cracked after kiln discharge is used as the aggregate, wherein the weight percentage of Fe2O3 is 5-10%, and the weight percentage of CaO is 20-55%. The dolomite non-burning carbon brick is prepared from the following raw materials in parts by weight: 26-30 parts of calcined synthetic white high-iron dolomite (3-5mm), 25-28 parts of calcined synthetic dolomite (1-3mm), 18-22 parts of fused magnesite (0.088-1mm), 10-15 parts of fused magnesite (<=0.088mm), 1-4 parts of aluminum powder, 5-15 parts of graphite, 1-3 parts of silicon powder, 2-5 parts of asphalt and 2-4 parts of phenolic resin. The preparation method comprises the procedures of premixing, mulling, blank compacting and heat treatment. By using the calcined synthetic high-iron dolomite which is not cracked after kiln discharge as the aggregate, the invention prepares the dolomite non-burning carbon brick having high waterproofing performance and low price.

Description

Rhombspar unburned carbon brick and preparation method thereof
Technical field
The present invention relates to iron and steel metallurgical industry with not burning the carbon brick technical field, be specifically related to a kind of new dolomite unburned carbon brick and preparation method thereof.
Background technology
CaO has the effect of cleaning molten steel, and the effect in fine steel grade fields such as smelting stainless steel, Clean Steel and low-sulfur steels is subject to people's attention just day by day.In addition, CaO also has unique chemical stability, and CaO is higher than the temperature of MgO and C coexistence.For example when smelting the low especially high-grade car plate IF steel of total impurities content, require to smelt the requirement that under high vacuum condition, just can touch the mark, when namely vacuum tightness reaches 67Pa (about 0.5 holder), could realize and finish the refining task.And be reduced to about 1230 ℃ at MgO under the condition of this condition of high vacuum degree and C temperature of reaction, namely this reaction can acutely be carried out under refining temperature.Research report points out that the reaction theory temperature of CaO-C is higher more than 200 ℃ than the theoretical temperatures of MgO-C reaction under equal vacuum condition, and namely under equal conditions, the carbon composite refractory performance that contains CaO is more stable.
Figure BDA0000045647900000011
If in this case, also use the MgO-C fire resistant materials as the liner of refining furnace, then liner will be seriously damaged in a short period of time.But the MgO-CaO-C material is not widely used as the MgO-C material, and its major cause is the easy aquation of CaO.At present, solving the method for commonly using in the Research Literature report of dolomite refractory aquation problem is to introduce ZrO 2Perhaps Y 2O 3Thereby Deng the aquation that suppresses rhombspar, but so most expensive extensive popularizations that never are able to of these raw materials.Publication number is that the Chinese invention patent of CN101306951A discloses a kind of non-sintered anti-hydrating konite carbon brick and preparation technology thereof, and adopting konite sand, high-purity electrosmelted magnesite clinker, graphite is that raw material is made.Publication number is that the Chinese invention patent of CN1800083A discloses a kind of anti-hydrated dolomite burnt brick and manufacture craft; These two patent applications have all proposed technical solution for anti-aquation problem, and still, its hydration resistance still awaits improving.
Great many of experiments and situ production empirical evidence, calcining synthesized high iron rhombspar has good preventing hydration effect.In rhombspar, introduce Fe 2O 3Under hot conditions, generate 2CaO afterwards 2.Fe 2O 3And CaO 2.Fe 2O 3Its fusing point is respectively 1435 ℃ and 1200 ℃, and the temperature of synthesized high iron rhombspar is generally more than 1700 ℃.So 2CaO of melting 2.Fe 2O 3And CaO 2.Fe 2O 3Will be wrapped in the particle surface of unreacted CaO and then prevent its aquation.In addition, the high ferrodolomite without fragmentation just can not produce new section behind the kiln discharge if select, thereby can further improve to a certain extent the hydration resistance of synthesized high iron rhombspar.
Summary of the invention
The purpose of this invention is to provide a kind of rhombspar unburned carbon brick and preparation method thereof, synthesizing rhombspar without the high ferro of fragmentation behind the method employing kiln discharge is main raw material, can effectively prevent the aquation of rhombspar raw material and rhombspar unburned carbon brick finished product, greatly improve the hydration resistance that does not burn carbon brick.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of rhombspar unburned carbon brick is characterized in that, adopts behind the kiln discharge calcining synthesized high iron rhombspar without fragmentation as aggregate, in the calcining synthesized high iron rhombspar, and Fe 2O 3Weight percentage 5~10%, CaO weight percentage 20~55%; Described rhombspar unburned carbon brick is made by weight proportion by following raw material:
Calcining synthesized high iron rhombspar 3mm~5mm 26~30
Calcining synthesized high iron rhombspar 1mm~3mm 25~28
Electrosmelted magnesite clinker 0.088mm~1mm 18~22
Electrosmelted magnesite clinker≤0.088mm 10~15
Graphite 5~15
Aluminium powder 1~4
Silica flour 1~3
Pitch 2~5
Resol 2~4.
The method for making of described calcining synthesized high iron rhombspar is: adopt natural dolomite mineral, the light-burned light dolomite that obtains under 900 ℃ of-1200 ℃ of temperature, the magnesia powder that adds granularity≤0.088mm in the rhombspar after digestion process mixes, and the add-on of magnesia powder is 0-2 times (also can not adding) of light dolomite weight before the digestion process; Then add red iron oxide, the red iron oxide add-on is the 5-10% of gross weight; Then carry out the artificial granulation, granularity is 1-5mm; Artificial particle calcined under 1800 ℃ of-2000 ℃ of high temperature can obtain calcining the synthesized high iron rhombspar.
The preparation method of described rhombspar unburned carbon brick may further comprise the steps:
1) by described raw material, proportioning and granularity requirements, take by weighing calcining synthesized high iron rhombspar, electrosmelted magnesite clinker, graphite, aluminium powder, silica flour, pitch and resol, to calcine first synthesized high iron rhombspar, electrosmelted magnesite clinker (〉=0.088mm) joined in the sand mill pre-mixed grind 2~4 minutes, and then added liquid phenolic resin mixing 3~5 minutes, then add graphite, aluminium powder, silica flour, pitch and electrosmelted magnesite clinker fine powder (≤0.088mm), mixed grind 10~15 minutes;
2) material that mixes is added in the mould, pressurize at 600 tons~1000 tons friction presses, make base substrate;
3) base substrate is sent into the dry kiln drying, 40~60 ℃ of dry kiln hot-wind inlet temperature, temperature is 180 ℃ between heat preservation zone, and 40~60 ℃ of temperature outs are not less than 16 hours time of drying.
Compared with prior art, the invention has the beneficial effects as follows:
Synthesizing rhombspar without the calcining high ferro of fragmentation behind the employing kiln discharge is main raw material, can effectively prevent the aquation of rhombspar raw material and rhombspar unburned carbon brick finished product, has greatly improved the hydration resistance that does not burn carbon brick.Owing to introduced CaO, played the effect of purify hot metal, also improved the lining life of refining furnace under the condition of high vacuum degree simultaneously.In addition, the present invention adopts behind the kiln discharge calcining synthesized high iron rhombspar without fragmentation, low-melting 2CaO in calcination process 2.Fe 2O 3And CaO 2.Fe 2O 3Be wrapped in the particle surface of unreacted CaO and do not produce new section, thereby can effectively prevent the aquation of CaO.
Embodiment
Embodiment 1
A kind of rhombspar unburned carbon brick adopts behind the kiln discharge calcining synthesized high iron rhombspar without fragmentation as aggregate, in the calcining synthesized high iron rhombspar, and Fe 2O 3Weight percentage 5~10%, CaO weight percentage 20~40%; Described rhombspar unburned carbon brick is made by weight proportion by following raw material:
Calcining synthesized high iron rhombspar 3mm~5mm 26
Calcining synthesized high iron rhombspar 1mm~3mm 28
Electrosmelted magnesite clinker 0.088mm~1mm 20
Electrosmelted magnesite clinker≤0.088mm 10
Graphite 8
Aluminium powder 2
Silica flour 2
Pitch 2
Resol 2.
The method for making of described calcining synthesized high iron rhombspar is: adopt natural dolomite mineral, the light-burned light dolomite that obtains under 900 ℃ of-1200 ℃ of temperature adds red iron oxide in the rhombspar after digestion process, and the red iron oxide add-on is the 5-10% of gross weight; Then carry out the artificial granulation, granularity is 1-5mm; Artificial particle calcined under 1800 ℃ of-2000 ℃ of high temperature can obtain calcining the synthesized high iron rhombspar.
Preparation method's step of described rhombspar unburned carbon brick is as follows:
1) by described raw material, proportioning and granularity requirements, take by weighing calcining synthesized high iron rhombspar, electrosmelted magnesite clinker, graphite, aluminium powder, silica flour, pitch and resol, to calcine first synthesized high iron rhombspar, electrosmelted magnesite clinker (〉=0.088mm) joined in the sand mill pre-mixed grind 2~4 minutes, and then added liquid phenolic resin mixing 3~5 minutes, then add graphite, aluminium powder, silica flour, pitch and electrosmelted magnesite clinker fine powder (≤0.088mm), mixed grind 10~15 minutes;
2) material that mixes is added in the mould, pressurize at 600 tons~1000 tons friction presses, make base substrate;
3) base substrate is sent into the dry kiln drying, 40~60 ℃ of dry kiln hot-wind inlet temperature, temperature is 180 ℃ between heat preservation zone, and 40~60 ℃ of temperature outs are not less than 16 hours time of drying.
Embodiment 2
A kind of rhombspar unburned carbon brick adopts behind the kiln discharge calcining synthesized high iron rhombspar without fragmentation as aggregate, in the calcining synthesized high iron rhombspar, and Fe 2O 3Weight percentage 5~10%, CaO weight percentage 20~40%; Described rhombspar unburned carbon brick is made by weight proportion by following raw material:
Calcining synthesized high iron rhombspar 3mm~5mm 28
Calcining synthesized high iron rhombspar 1mm~3mm 25
Electrosmelted magnesite clinker 0.088mm~1mm 18
Electrosmelted magnesite clinker≤0.088mm 12
Graphite 11
Aluminium powder 1
Silica flour 1
Pitch 2
Resol 2.
The method for making of described calcining synthesized high iron rhombspar is: adopt natural dolomite mineral, the light-burned light dolomite that obtains under 900 ℃ of-1200 ℃ of temperature, the magnesia powder that adds granularity≤0.088mm in the rhombspar after digestion process mixes, and the light dolomite weight ratio is 1: 1 before the add-on of magnesia powder and the digestion process; Then add red iron oxide, the red iron oxide add-on is the 5-10% of gross weight; Then carry out the artificial granulation, granularity is 1-5mm; Artificial particle calcined under 1800 ℃ of-2000 ℃ of high temperature can obtain calcining the synthesized high iron rhombspar.
The preparation method of described rhombspar unburned carbon brick is with embodiment 1.
Embodiment 3
A kind of rhombspar unburned carbon brick adopts behind the kiln discharge calcining synthesized high iron rhombspar without fragmentation as aggregate, in the calcining synthesized high iron rhombspar, and Fe 2O 3Weight percentage 5~10%, CaO weight percentage 30~55%; Described rhombspar unburned carbon brick is made by weight proportion by following raw material:
Calcining synthesized high iron rhombspar 3mm~5mm 30
Calcining synthesized high iron rhombspar 1mm~3mm 26
Electrosmelted magnesite clinker 0.088mm~1mm 22
Electrosmelted magnesite clinker≤0.088mm 15
Graphite 5
Aluminium powder 4
Silica flour 3
Pitch 5
Resol 4.
The method for making of described calcining synthesized high iron rhombspar is: adopt natural dolomite mineral, the light-burned light dolomite that obtains under 900 ℃ of-1200 ℃ of temperature, the magnesia powder that adds granularity≤0.088mm in the rhombspar after digestion process mixes, and the light dolomite weight ratio is 1: 2 before the add-on of magnesia powder and the digestion process; Then add red iron oxide, the red iron oxide add-on is the 5-10% of gross weight; Then carry out the artificial granulation, granularity is 1-5mm; Artificial particle calcined under 1800 ℃ of-2000 ℃ of high temperature can obtain calcining the synthesized high iron rhombspar.
The preparation method of described rhombspar unburned carbon brick is with embodiment 1.
Embodiment 4
A kind of rhombspar unburned carbon brick adopts behind the kiln discharge calcining synthesized high iron rhombspar without fragmentation as aggregate, in the calcining synthesized high iron rhombspar, and Fe 2O 3Weight percentage 5~10%, CaO weight percentage 45~55%; Described rhombspar unburned carbon brick is made by weight proportion by following raw material:
Calcining synthesized high iron rhombspar 3mm~5mm 28
Calcining synthesized high iron rhombspar 1mm~3mm 25
Electrosmelted magnesite clinker 0.088mm~1mm 20
Electrosmelted magnesite clinker≤0.088mm 12
Graphite 10
Aluminium powder 2
Silica flour 2
Pitch 3
Resol 4.
The method for making of described calcining synthesized high iron rhombspar is: adopt natural dolomite mineral, the light-burned light dolomite that obtains under 900 ℃ of-1200 ℃ of temperature, the magnesia powder that adds granularity≤0.088mm in the rhombspar after digestion process mixes, and the light dolomite weight ratio is 1: 1.5 before the add-on of magnesia powder and the digestion process; Then add red iron oxide, the red iron oxide add-on is the 5-10% of gross weight; Then carry out the artificial granulation, granularity is 1-5mm; Artificial particle calcined under 1800 ℃ of-2000 ℃ of high temperature can obtain calcining the synthesized high iron rhombspar.
The preparation method of described rhombspar unburned carbon brick is with embodiment 1.
Comparative Examples
(1) proportioning raw materials sees Table 1
Wherein, used main raw material all is electrosmelted magnesite clinker.
(2) preparation method is as follows:
1) presses the proportioning of table 1, accurately take by weighing electrosmelted magnesite clinker, graphite, resol and other additives, particle joined in the sand mill pre-mixed grind 2~4 minutes in first will be thick, and then added liquid resin and add remaining raw material after mixing 3~5 minutes, mixed grind 10~15 minutes;
2) material that mixes is added in the mould, pressurize at 600 tons~1000 tons friction presses, make base substrate;
3) base substrate is sent into the dry kiln drying, 40~60 ℃ of dry kiln hot-wind inlet temperature, temperature is 180 ℃ between heat preservation zone, and 40~60 ℃ of temperature outs are not less than 16 hours time of drying.
Finished product test the results are shown in Table 1.
The detection method of erosion-resisting characteristics: press the proportioning of table 1, carry out anti-slag according to GB GB/T8931-2007 with Static crucible method and detect, drill out the cinder hole of Φ 40mm * 35mm at the article center position, and in cinder hole, be respectively charged into 40 gram slags.1600 ℃ of insulations 3 hours.Measure the finished product section by the size of slag action amount and infiltration capacity.
Table 1
Figure BDA0000045647900000061
Among the embodiment 5-embodiment 8, the method for making that the present invention calcines the synthesized high iron rhombspar is: adopt natural dolomite mineral, the light-burned light dolomite that obtains under 900 ℃ of-1200 ℃ of temperature adds red iron oxide in the rhombspar after digestion process, and the red iron oxide add-on is the 5-10% of gross weight; Then carry out the artificial granulation, granularity is 1-5mm; Artificial particle calcined under 1800 ℃ of-2000 ℃ of high temperature can obtain calcining the synthesized high iron rhombspar.
Preparation method's step of rhombspar unburned carbon brick of the present invention is as follows:
1) by described raw material, proportioning and granularity requirements, take by weighing calcining synthesized high iron rhombspar, electrosmelted magnesite clinker, graphite, aluminium powder, silica flour, pitch and resol, to calcine first synthesized high iron rhombspar, electrosmelted magnesite clinker (〉=0.088mm) joined in the sand mill pre-mixed grind 2~4 minutes, and then added liquid phenolic resin mixing 3~5 minutes, then add graphite, aluminium powder, silica flour, pitch and electrosmelted magnesite clinker fine powder (≤0.088mm), mixed grind 10~15 minutes;
2) material that mixes is added in the mould, pressurize at 600 tons~1000 tons friction presses, make base substrate;
3) base substrate is sent into the dry kiln drying, 40~60 ℃ of dry kiln hot-wind inlet temperature, temperature is 180 ℃ between heat preservation zone, and 40~60 ℃ of temperature outs are not less than 16 hours time of drying.
Among above-mentioned eight embodiment, the finished product chemical index of the rhombspar unburned carbon brick that makes is, by weight percentage: SiO 2≤ 3.0%, Al 2O 31.0-5.0%, Fe 2O 32.5-6.0%, CaO 10-35%, C 5-15%, MgO45-68%.

Claims (3)

1. a rhombspar unburned carbon brick is characterized in that, adopts behind the kiln discharge calcining synthesized high iron rhombspar without fragmentation as aggregate, in the calcining synthesized high iron rhombspar, and Fe 2O 3Weight percentage 5~10%, CaO weight percentage 20~55%; Described rhombspar unburned carbon brick is made by weight proportion by following raw material:
Figure FDA0000251255321
2. a kind of rhombspar unburned carbon brick according to claim 1, it is characterized in that, the method for making of described calcining synthesized high iron rhombspar is: adopt natural dolomite mineral, the light-burned light dolomite that obtains under 900 ℃ of-1200 ℃ of temperature, the magnesia powder that adds granularity≤0.088mm in the rhombspar after digestion process mixes, and the add-on of magnesia powder is 0-2 times of light dolomite weight before the digestion process; Then add red iron oxide, the red iron oxide add-on is the 5-10% of gross weight; Then carry out the artificial granulation, granularity is 1-5mm; Artificial particle calcined under 1800 ℃ of-2000 ℃ of high temperature can obtain calcining the synthesized high iron rhombspar.
3. the preparation method of rhombspar unburned carbon brick according to claim 1 and 2 is characterized in that may further comprise the steps:
1) by described raw material, proportioning and granularity requirements, take by weighing calcining synthesized high iron rhombspar, electrosmelted magnesite clinker, graphite, aluminium powder, silica flour, pitch and resol, to calcine first synthesized high iron rhombspar, granularity and join in the sand mill pre-mixed grind 2~4 minutes greater than 0.088mm less than or equal to the electrosmelted magnesite clinker of 1mm, and then added liquid phenolic resin mixing 3~5 minutes, then add graphite, aluminium powder, silica flour, pitch and granularity less than or equal to the electrosmelted magnesite clinker fine powder of 0.088mm, mixed grind 10~15 minutes;
2) material that mixes is added in the mould, pressurize at 600 tons~1000 tons friction presses, make base substrate;
3) base substrate is sent into the dry kiln drying, 40~60 ℃ of dry kiln hot-wind inlet temperature, temperature is 180 ℃ between heat preservation zone, and 40~60 ℃ of temperature outs are not less than 16 hours time of drying.
CN 201110029833 2011-01-27 2011-01-27 Dolomite non-burning carbon brick and preparation method thereof Expired - Fee Related CN102167607B (en)

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CN102787210A (en) * 2012-06-28 2012-11-21 辽宁中汇环保科技有限公司 Calcareous premelted composite deoxidation and desulfurization agent for low-cost steel-making and method for preparing same
CN102765951A (en) * 2012-08-02 2012-11-07 营口青花耐火材料股份有限公司 Magnesium-calcium-titanium-carbon brick and preparation method thereof
GB201306043D0 (en) * 2013-04-04 2013-05-22 Steetley Dolomite Ltd A method of producting refactory material
CN104261845B (en) * 2014-09-19 2016-01-20 沈阳化工大学 A kind of preparation method of rhombspar carbon brick
CN105418090A (en) * 2015-11-24 2016-03-23 怀宁县凉亭建材有限责任公司 Preparation method for dolomite refractory bricks

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CN1459342A (en) * 2002-05-24 2003-12-03 北京利尔耐火材料有限公司 Dry type magnesium calcium work-lining for tundish
CN100335440C (en) * 2005-01-20 2007-09-05 海城华宇耐火材料有限公司 High-calcium low-iron magnesian dry method ramming mass and its production method
CN101050125A (en) * 2006-04-03 2007-10-10 高兴奎 Tundish dry type work lining mass of magnesiodolomite
CN101306951A (en) * 2008-07-07 2008-11-19 营口青花耐火材料股份有限公司 Non-sintered anti-hydrating konite carbon brick and preparation process

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