CN1927767A - High thermal shock abrasive brick for dry quenched coke oven chute pillar and manufacture method - Google Patents
High thermal shock abrasive brick for dry quenched coke oven chute pillar and manufacture method Download PDFInfo
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Abstract
The present invention discloses one kind of abrasive brick with high thermal shock resistance for use in dry quenching coke oven and its making process. The abrasive brick is made with the materials including silicon carbide 62-80 wt%, silicon nitride 17-35 wt%, inorganic adhesive 0.4-3 wt%, lanthanide oxide 0.1-0.8 wt% and ferric oxide impurity less than 1.0 wt%, and has high thermal shock stability and normal temperature pressure strength higher than 120 MPa. The making process includes the steps of mixing all the materials, pressing at 75-125 N/sq mm pressure to form adobe, stoving the adobe at 100-300 deg.c and final sintering in a kiln at 1380-1420 deg.c under the protection of nitrogen. The abrasive brick with high thermal shock resistance has long service life.
Description
Technical field
The present invention relates to the used dry quenched coke oven chute pillar manufactured materials of smelting iron and steel enterprise, refer to a kind of high thermal shock abrasive brick for dry quenched coke oven chute pillar and preparation method thereof particularly.
Background technology
Dry coke quenching is that smelting iron and steel enterprise adopts rare gas element with a kind of coke quenching method of red burnt cooling refrigerative in coke dry quenching furnace.This method can make full use of red burnt sensible heat, obviously improves the coke quality, and simultaneously effective save energy significantly reduces discharge of poisonous waste, safeguards atmospheric environment.At present, in the large-scale dry quenching system more than the processing power 120t/h, the restricted link that influences the production capacity performance is the dry quenched coke oven chute pillar breakage at home.Dry quenching system with Wuhan Iron ﹠ Steel (Group) Corp. is an example, its 1# dry quenching system design coke processing power is 140t/h, during go into operation in March, 2006 to from December, 2003,, amount to 150 days because of dry quenched coke oven chute pillar refractory brick breakage shutdown maintenance 4 times.The scientific research personnel learns by damaged situation analysis and damage test to the dry quenched coke oven chute pillar refractory brick marshalling: dry quenched coke oven chute pillar should bear the huge load of top masonry and coke, bear the extruding of coke wriggling again, and 300～1000 ℃ of thermal stresses that temperature fluctuation produced, the quality of its refractory brick is one of key.Yet the refractory brick that the chute column masonry of existing large-scale coke dry quenching furnace is adopted mostly is mullite-silicon carbide brick, and its physical and chemical index is as shown in table 1 below:
Table 1: the main physical and chemical index of mullite-silicon carbide brick
| Project | Index | Project | Index |
| Volume density, g/cm 3 | ≥2.5 | Cold crushing strength, MPa | ≥85 |
| Apparent porosity, % | ≤2 | High temperature break resistant intensity, MPa (1100 ℃) | ≥20 |
| Coefficient of thermal expansion, % (1350 ℃) | - | Al 2O 3，％ | ≥35 |
| Refractoriness under load, ℃ (0.2MPa) | ≥1600 | Fe 2O 3，％ | ≤1.0 |
| Thermal shock resistance, inferior (1100 ℃ of water-cooleds) | ≥40 | SiC，％ | ≥30 |
From the physical and chemical index of table 1 as can be known: the physicals of above-mentioned mullite-silicon carbide refractory brick is relatively poor, particularly the physical and chemical index of most critical as: thermal shock resistance, high temperature break resistant intensity, cold crushing strength etc. all can not adapt to the working condition requirement of dry quenched coke oven chute pillar position complexity.Because the top masonry load that dry quenched coke oven chute pillar bore is big, thus be easy to cause the refractory brick fracture at this position, thus causing chute column cracking, shorten work-ing life, greatly limited the performance of dry quenching system production capacity.
Summary of the invention
Purpose of the present invention is intended to fundamentally solve the defective that dry quenched coke oven chute pillar refractory brick loosens easily, ruptures, comes off etc., provide a kind of and can significantly improve the high thermal shock abrasive brick for dry quenched coke oven chute pillar in work-ing life, and the making method of this high thermal shock abrasive brick.
For achieving the above object, the high thermal shock abrasive brick for dry quenched coke oven chute pillar that the present invention developed is with silicon carbide (SiC) and silicon nitride (Si
3N
4) be base stock, add the trace rare-earth lanthanide oxide, be equipped with an amount of mineral binder bond, form through mixing, compacting, sintering.Each component weight percent in this high thermal shock abrasive brick is: silicon carbide (SiC) 62～80%, silicon nitride (Si
3N
4) 17～35%, mineral binder bond 0.4～3%, rare earth lanthanide oxide 0.1～0.8%, ferric oxide (Fe
2O
3) impurity is less than 1.0%.
The preferable weight percent of each component is in the above-mentioned high thermal shock abrasive brick: silicon carbide 65～77%, and silicon nitride 21～33%, mineral binder bond 1.2～2.7%, rare earth lanthanide oxide 0.2～0.6%, ferric oxide impurity is less than 0.8%.
The weight percent of each component the best is in the above-mentioned high thermal shock abrasive brick: silicon carbide 74%, silicon nitride 22.5%, mineral binder bond 2.6%, rare earth lanthanide oxide 0.4%, ferric oxide impurity 0.5%.
A kind of in the preferred ytterbium oxide of rare earth lanthanide oxide in the above-mentioned high thermal shock abrasive brick, the cerium oxide, or the combination of their arbitrary proportions.
Mineral binder bond preferably sulfuric acid aluminium Al in the above-mentioned high thermal shock abrasive brick
2(SO
4)
3
The making method of above-mentioned high thermal shock abrasive brick may further comprise the steps:
1) in each component weight percent in the final finished high thermal shock abrasive brick be: silicon carbide 62～80%, silicon nitride 17～35%, mineral binder bond 0.4～3%, rare earth lanthanide oxide 0.1～0.8%, ferric oxide impurity are less than 1.0% ratio, be ready to various raw material for standby, the particle diameter ratio of feed particles is: 2.5～1.0mm accounts for 35～45%, 1.0～0.5mm accounts for 30～40%, what 0.5mm was following accounts for 25～35%;
2) earlier with ready base-material silicon carbide, silicon nitride and the granulation of trace mineral supplement rare earth lanthanide oxide uniform mixing, then add ready mineral binder bond, inorganic adhesive is evenly covered on the formed particle surface;
3) then the raw material that mixes is inserted in the forming mould, at 75～150N/mm
2Pressure condition under be pressed into corresponding blank brick;
4) again the blank brick is placed in the drying oven, under 100～300 ℃ temperature condition, dry;
5) at last the blank brick of drying is placed kiln, sintering under 1380～1420 ℃ temperature condition promptly can be made into high thermal shock abrasive brick.
In the making method of above-mentioned high thermal shock abrasive brick, raw material mixes the formed grain diameter in back and preferably is not more than 2.5mm, guaranteeing the density between the feed particles skeleton, and then guarantees the compressive strength and the folding strength of finished bricks.And, the preferred 75～120N/mm of pressure of compacting blank brick
2, preferred 180～270 ℃ of the temperature of dry blank brick, the temperature of sintering blank brick is strict controlled between 1380～1420 ℃, and adopts nitrogen (N
2) protection comes sintering blank brick.Under such pressure condition and temperature condition, can guarantee further that made high thermal shock abrasive brick finished product reaches design requirements.
The invention has the advantages that: designed high thermal shock abrasive brick has taken into full account it and has used the processing condition of position complexity and the top masonry load that dry quenched coke oven chute pillar bore.By the preferred raw material prescription, utilize silicon carbide to have high-melting-point, high rigidity, wear-resisting, alkaline-resisting, acidproof, characteristics such as thermal shock resistance is good, thermal conductivity is high and pore is little, increase its consumption as far as possible; Adopt inorganic bonding agent can form silicon carbide nitride silicon in conjunction with phase, particularly adopt Tai-Ace S 150 can impel silicon carbide nitride silicon in conjunction with mutually reliable and stable.And, add the trace rare-earth element ytterbium oxide, cerium oxide can make it produce liquid phase in advance, reduces the firing temperature value, make the finished bricks that obtained not only resistance to heat shocks can significantly improve, and wear resisting property also greatly improves, and also can obviously improve high temperature use properties and other physical and chemical index of finished bricks.Simultaneously; on the manufacture craft of high thermal shock abrasive brick; can form fine and close blank by suitable increase base pressure; by controlling suitable temperature sintering and adopting nitrogen protective sintering; it is more better than mullite-silicon carbide brick to produce performance index, the brick that particularly thermal shock resistance is higher, wear resisting property is stronger.Detect through experiment, the physical and chemical index of high thermal shock abrasive brick of the present invention is as shown in table 2 below:
Table 2: the main physical and chemical index of high thermal shock abrasive brick
| Project | Index | Project | Index |
| Volume density, g/cm 3 | 2.5～2.8 | Strength at normal temperature, MPa | ≥35 |
| Apparent porosity, % | ≤20 | High temperature break resistant intensity, MPa (1400 ℃) | ≥35 |
| Coefficient of thermal expansion, % (1350 ℃) | ≤5.5×10 -6 | SiC，％ | ≥62 |
| Thermal shock resistance, inferior (1100 ℃ of water-cooleds) | ≥80 | Fe 2O 3，％ | ≤1.0 |
| Cold crushing strength, MPa | ≥120 | Si 3N 4，％ | ≥17 |
From the physical and chemical index of table 2 as can be known: shake stability, strength at normal temperature, hot modulus of rupture, cold crushing strength etc. of the heat of above-mentioned high thermal shock abrasive brick satisfy the requirement that it uses position special operation condition condition to change fully, and its volume density, apparent porosity, coefficient of thermal expansion index are moderate.Therefore, can improve greatly the work-ing life of dry quenched coke oven chute pillar high thermal shock abrasive brick of the present invention, and its life cycle of simulation test can reach 5～8 years.
Embodiment
Below in conjunction with specific embodiment high thermal shock abrasive brick for dry quenched coke oven chute pillar of the present invention and preparation method thereof is described in further detail:
Embodiment 1: in each component weight percent in the final finished high thermal shock abrasive brick be: the ratio of silicon carbide 74%, silicon nitride 22.5%, Tai-Ace S 150 2.6%, ytterbium oxide 0.2%, cerium oxide 0.2%, ferric oxide 0.5% is ready to various raw materials.At first with base-material silicon carbide, silicon nitride and additive ytterbium oxide, the granulation of cerium oxide uniform mixing, then add Tai-Ace S 150, Tai-Ace S 150 is evenly covered on the formed particle surface, raw material mixes the formed grain diameter in back and is not more than 2.5mm.Then the raw material that mixes is inserted in the steel die, at 120N/mm
2Pressure condition under be pressed into corresponding blank brick.Again the blank brick is placed in the drying oven, under 250 ℃ temperature condition, dry.Blank brick with oven dry places kiln at last, under 1400 ℃ temperature condition, adopts nitrogen protective sintering, promptly can be made into high thermal shock abrasive brick.After testing as can be known, the thermal shock resistance of this high thermal shock abrasive brick (1100 ℃ of water-cooleds) is 123 times, and cold crushing strength is 187MPa.
Embodiment 2: in each component weight percent in the final finished high thermal shock abrasive brick be: the ratio of silicon carbide 65%, silicon nitride 32.3%, Tai-Ace S 150 1.2%, ytterbium oxide 0.4%, cerium oxide 0.3%, ferric oxide 0.8% is ready to various raw materials.At first with base-material silicon carbide, silicon nitride and additive ytterbium oxide, the granulation of cerium oxide uniform mixing, then add Tai-Ace S 150, Tai-Ace S 150 is evenly covered on the formed particle surface, raw material mixes the formed grain diameter in back and is not more than 2.5mm.Then the raw material that mixes is inserted in the steel die, at 140N/mm
2Pressure condition under be pressed into corresponding blank brick.Again the blank brick is placed in the drying oven, under 260 ℃ temperature condition, dry.Blank brick with oven dry places kiln at last, under 1420 ℃ temperature condition, adopts nitrogen protective sintering, promptly can be made into high thermal shock abrasive brick.After testing as can be known, the thermal shock resistance of this high thermal shock abrasive brick (1100 ℃ of water-cooleds) is 112 times, and cold crushing strength is 168MPa.
Embodiment 3: in each component weight percent in the final finished high thermal shock abrasive brick be: the ratio of silicon carbide 77%, silicon nitride 21%, Tai-Ace S 150 1.2%, ytterbium oxide 0.2%, cerium oxide 0.2%, ferric oxide 0.4% is ready to various raw materials.At first with base-material silicon carbide, silicon nitride and additive ytterbium oxide, the granulation of cerium oxide uniform mixing, then add Tai-Ace S 150, Tai-Ace S 150 is evenly covered on the formed particle surface, raw material mixes the formed grain diameter in back and is not more than 2.5mm.Then the raw material that mixes is inserted in the steel die, at 100N/mm
2Pressure condition under be pressed into corresponding blank brick.Again the blank brick is placed in the drying oven, under 280 ℃ temperature condition, dry.Blank brick with oven dry places kiln at last, under 1380 ℃ temperature condition, adopts nitrogen protective sintering, promptly can be made into high thermal shock abrasive brick.After testing as can be known, the thermal shock resistance of this high thermal shock abrasive brick (1100 ℃ of water-cooleds) is 146 times, and cold crushing strength is 151MPa.
Embodiment 4: in each component weight percent in the final finished high thermal shock abrasive brick be: the ratio of silicon carbide 80%, silicon nitride 17%, Tai-Ace S 150 2.3%, ytterbium oxide 0.3%, ferric oxide 0.4% is ready to various raw materials.At first with base-material silicon carbide, silicon nitride and additive ytterbium oxide, the granulation of cerium oxide uniform mixing, then add Tai-Ace S 150, Tai-Ace S 150 is evenly covered on the formed particle surface, raw material mixes the formed grain diameter in back and is not more than 2.5mm.Then the raw material that mixes is inserted in the steel die, at 90N/mm
2Pressure condition under be pressed into corresponding blank brick.Again the blank brick is placed in the drying oven, under 250 ℃ temperature condition, dry.Blank brick with oven dry places kiln at last, under 1400 ℃ temperature condition, adopts nitrogen protective sintering, promptly can be made into high thermal shock abrasive brick.After testing as can be known, the thermal shock resistance of this high thermal shock abrasive brick (1100 ℃ of water-cooleds) is 96 times, and cold crushing strength is 162MPa.
Embodiment 5: in each component weight percent in the final finished high thermal shock abrasive brick be: the ratio of silicon carbide 62%, silicon nitride 34%, Tai-Ace S 150 2.3%, cerium oxide 0.7%, ferric oxide 1.0% is ready to various raw materials.At first with base-material silicon carbide, silicon nitride and additive ytterbium oxide, the granulation of cerium oxide uniform mixing, then add Tai-Ace S 150, Tai-Ace S 150 is evenly covered on the formed particle surface, raw material mixes the formed grain diameter in back and is not more than 2.5mm.Then the raw material that mixes is inserted in the steel die, at 96N/mm
2Pressure condition under be pressed into corresponding blank brick.Again the blank brick is placed in the drying oven, under 260 ℃ temperature condition, dry.Blank brick with oven dry places kiln at last, under 1400 ℃ temperature condition, adopts nitrogen protective sintering, promptly can be made into high thermal shock abrasive brick.After testing as can be known, the thermal shock resistance of this high thermal shock abrasive brick (1100 ℃ of water-cooleds) is 83 times, and cold crushing strength is 122MPa.
Claims (10)
1. high thermal shock abrasive brick for dry quenched coke oven chute pillar, it is a base stock with silicon carbide and silicon nitride, add the trace rare-earth lanthanide oxide, be equipped with an amount of mineral binder bond, form through mixing, compacting, sintering, it is characterized in that: the each component weight percent in this high thermal shock abrasive brick is: silicon carbide 62～80%, silicon nitride 17～35%, mineral binder bond 0.4～3%, rare earth lanthanide oxide 0.1～0.8%, ferric oxide impurity is less than 1.0%.
2. high thermal shock abrasive brick for dry quenched coke oven chute pillar according to claim 1, it is characterized in that: the each component weight percent in this high thermal shock abrasive brick is: silicon carbide 65～77%, silicon nitride 21～33%, mineral binder bond 1.2～2.7%, rare earth lanthanide oxide 0.2～0.6%, ferric oxide impurity is less than 0.8%.
3. high thermal shock abrasive brick for dry quenched coke oven chute pillar according to claim 1, it is characterized in that: the each component weight percent in this high thermal shock abrasive brick is: silicon carbide 74%, silicon nitride 22.5%, mineral binder bond 2.6%, rare earth lanthanide oxide 0.4%, ferric oxide impurity 0.5%.
4. according to claim 1 or 2 or 3 described high thermal shock abrasive brick for dry quenched coke oven chute pillar, it is characterized in that: the rare earth lanthanide oxide in this high thermal shock abrasive brick is the combination of a kind of or their arbitrary proportions in ytterbium oxide, the cerium oxide.
5. according to claim 1 or 2 or 3 described high thermal shock abrasive brick for dry quenched coke oven chute pillar, it is characterized in that: the mineral binder bond in this high thermal shock abrasive brick is a Tai-Ace S 150.
6. the making method of the described high thermal shock abrasive brick for dry quenched coke oven chute pillar of claim 1 may further comprise the steps:
1) in each component weight percent in the final finished high thermal shock abrasive brick be: silicon carbide 62～80%, silicon nitride 17～35%, mineral binder bond 0.4～3%, rare earth lanthanide oxide 0.1～0.8%, ferric oxide impurity are ready to various raw material for standby less than 1.0% ratio;
2) earlier with ready base-material silicon carbide, silicon nitride and the granulation of trace mineral supplement rare earth lanthanide oxide uniform mixing, then add ready mineral binder bond, inorganic adhesive is evenly covered on the formed particle surface;
3) then the raw material that mixes is inserted in the forming mould, at 75～150N/mm
2Pressure condition under be pressed into corresponding blank brick;
4) again the blank brick is placed in the drying oven, under 100～300 ℃ temperature condition, dry;
5) at last the blank brick of drying is placed kiln, sintering under 1380～1420 ℃ temperature condition promptly can be made into high thermal shock abrasive brick.
7. the making method of high thermal shock abrasive brick for dry quenched coke oven chute pillar according to claim 6 is characterized in that: said step 2), raw material mixes the formed grain diameter in back and is not more than 2.5mm.
8. the making method of high thermal shock abrasive brick for dry quenched coke oven chute pillar according to claim 6 is characterized in that: in the said step 3), the pressure of compacting blank brick is 75～120N/mm
2
9. the making method of high thermal shock abrasive brick for dry quenched coke oven chute pillar according to claim 6, it is characterized in that: in the said step 4), the temperature of dry blank brick is 180～270 ℃.
10. the making method of high thermal shock abrasive brick for dry quenched coke oven chute pillar according to claim 6 is characterized in that: in the said step 5), adopt nitrogen protective sintering blank brick.
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| CNB2006101245660A CN100381399C (en) | 2006-09-21 | 2006-09-21 | High thermal shock abrasive brick for dry quenched coke oven chute pillar and manufacture method |
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| CN1927767A true CN1927767A (en) | 2007-03-14 |
| CN100381399C CN100381399C (en) | 2008-04-16 |
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| CN106281370A (en) * | 2015-05-25 | 2017-01-04 | 五冶集团上海有限公司 | A kind of refractory brick of novel regulation coke dry quenching furnace chute mouth sectional area |
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