CN102701766A - High-quality sintered konite brick for refining low-carbon ultra-low carbon steel - Google Patents
High-quality sintered konite brick for refining low-carbon ultra-low carbon steel Download PDFInfo
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- CN102701766A CN102701766A CN2012101935182A CN201210193518A CN102701766A CN 102701766 A CN102701766 A CN 102701766A CN 2012101935182 A CN2012101935182 A CN 2012101935182A CN 201210193518 A CN201210193518 A CN 201210193518A CN 102701766 A CN102701766 A CN 102701766A
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Abstract
The invention relates to a high-quality sintered konite brick for refining low-carbon ultra-low carbon steel. The high-quality sintered magnesium dolomite brick is characterized in that the high-quality sintered konite brick is produced by adopting the following steps of: adopting konite sand with greater than 55% of CaO and greater than 41% of MgO and large crystal fused magnesite with greater than 98% of MgO as raw materials, adding a binding agent, crushing, sieving and fine grinding the raw materials, proportioning, mulling, molding, hacking, sintering, sorting, detecting, waxing and packaging. Compared with the prior art, the high-quality sintered konite brick has the beneficial effects that the high-quality sintered konite brick has high-temperature corrodibility resistance and stripping resistance as well as obvious effect specially in terms of molten steel purification and creates the conditions for energy saving, emission reduction, cost reduction and quality improvement in iron and steel enterprises; and as the high-quality sintered konite brick prolongs the service life of a steel ladle, the energy consumption of heating ladles and the discharge amount of exhaust gas are reduced, the times of furnace repair is reduced, and the cost of a tonne of steel is reduced.
Description
Technical field
What the present invention relates to that the low-carbon (LC) refining ultra-low-carbon steel uses burns till the konite brick preparing technical field, and particularly a kind of refining low-carbon (LC) used for ultra-low-carbon steel high-quality is burnt till konite brick.
Background technology
Dolomite brick is widely used; It is the alkaline refractory products that Britain processed in 1878, develops rapidly through secular use, the particularly development with converter process; Just after having developed the MgO-C brick; Its consumption just obviously reduces, and however, it is still the important brick kind of developed country's secondary refining stoves such as current Europe and Japan.
Burning till konite brick fires natural dolomite sand or synthetic dolomite sand and sintering or electrosmelted magnesite clinker and non-water system bond material mixing moulding and forms; Because being lower than, its price combines again and half recombined magnesia-chrome brick; And use the back brick to handle easily or the like reason because of not containing chromium; Have many consumers also in active adoption; Especially presenting rapid increase trend especially to containing developed countries such as exclusive Europe of chrome brick and Japan, it is the used main refractory materialss of refining low-carbon (LC) ultra low-carbon steel such as current global AOD stove.
Has high temperature resistant aggressiveness; Particularly the purify hot metal aspect has unusual effect; " refining low-carbon (LC) used for ultra-low-carbon steel high-quality is burnt till konite brick " is following metallurgical with one of refractory materials developing direction; It is responsive to ambient moisture, and aquation is the focus of domestic and international refractory materials circle concern and the difficult point of research always easily.
Summary of the invention
The purpose of this invention is to provide a kind of environmental protection that is beneficial to, purify hot metal improves ladle work-ing life, reduces and repaiies the heat number, reduces the high-quality of ton steel cost and burns till konite brick.
For realizing above-mentioned purpose, the present invention adopts following technical scheme to realize:
A kind of refining low-carbon (LC) used for ultra-low-carbon steel high-quality is burnt till konite brick; It is raw material that this high-quality is burnt till konite brick employing CaO＞55%, the konite sand of MgO＞41% and the big crystallization electrosmelted magnesite clinker of MgO＞98%; Add wedding agent, through raw material pulverizing screening fine grinding, proportioning and mix, moulding, stack bricks, burn till, choose and pack the production high-quality with detection, waxdip and burn till konite brick;
(1) raw material pulverizing screening fine grinding: CaO＞55%, MgO＞41% konite sand is broken in crusher, process respectively more than or equal to 3mm less than the particle of 5mm, more than or equal to 1mm less than the particle of 3mm with more than or equal to the particle of 0.3mm less than 1mm; The big crystallization electrosmelted magnesite clinker of MgO＞98% is broken in crusher or Raymond machine, process respectively more than or equal to 1mm less than the particle of 3mm, more than or equal to 0.074mm less than the particle of 1mm with less than the particle of 0.074mm;
(2) proportioning and mixing: add by ratio of weight and the number of copies CaO＞55%, MgO＞41% konite sand more than or equal to 3mm less than 15～20 parts of the particulate material of 5mm, more than or equal to 1mm less than 10～15 parts of the particulate material of 3 mm, more than or equal to 0.3mm less than 10～20 parts of the particulate material of 1mm; Add the big crystallization electrosmelted magnesite clinker of MgO＞98% more than or equal to 1mm less than 20～25 parts of the particulate material of 3mm, more than or equal to 0.074mm less than 5～10 parts of the particulate material of 1mm, less than 20～30 parts of the particulate material of 0.074mm, add wedding agent and mix for 2～4 parts; The combined binder that described wedding agent paraffin and alkene are formed, the alkene add-on is weight percent (1-30) % of paraffin;
And then through moulding, stack bricks, burn till, choose and the completion of detection, waxdip packaging step.
Compared with prior art, the invention has the beneficial effects as follows:
The konite sand of main raw material CaO of the present invention＞55%, MgO＞41%; Be that to be that fuel is once sintered with natural rhombspar with heavy oil by the ultrahigh-temperature rotary kiln form; Fire mode than traditional coke or anthracite and not only reduced the pollution of fuel konite sand; Also reduced simultaneously the discharging of polluting, vital role has been played in manufacturing enterprise and surrounding enviroment protection.
The present invention has high temperature resistant aggressiveness and spalling resistance; The particularly remarkable effect of purify hot metal aspect; Created condition for iron and steel enterprise's energy-saving and emission-reduction reduce cost to improve the quality,, reduced roasting bag energy consumption and discharge amount of exhaust gas because high-quality is burnt till the work-ing life that konite brick has improved ladle; Reduced and repaiied the heat number, reduced ton steel cost; Also because molten steel retention period in ladle furnace; Reduced steel inner non-metallic The amount of inclusions, reduced steel inner non-metallic inclusion size because high-quality is burnt till the effect of free quicklime in the konite brick; Steel quality is improved, for iron and steel enterprise's steel product quality provides powerful guarantee.
Embodiment
Embodiment 1
(1) raw material pulverizing screening fine grinding: CaO＞55%, MgO＞41% konite sand is broken in crusher, process respectively more than or equal to 3mm less than the particle of 5mm, more than or equal to 1mm less than the particle of 3mm with more than or equal to the particle of 0.3mm less than 1mm; The big crystallization electrosmelted magnesite clinker of MgO＞98% is broken in crusher or Raymond machine, process respectively more than or equal to 1mm less than the particle of 3mm, more than or equal to 0.074mm less than the particle of 1mm with less than the particle of 0.074mm.
(2) proportioning and mixing: add by ratio of weight and the number of copies CaO＞55%, MgO＞41% konite sand more than or equal to 3mm less than 20 parts of the particulate material of 5mm, more than or equal to 1mm less than 15 parts of the particulate material of 3 mm, more than or equal to 0.3mm less than 15 parts of the particulate material of 1mm; Add the big crystallization electrosmelted magnesite clinker of MgO＞98% more than or equal to 1mm less than 20 parts of the particulate material of 3mm, more than or equal to 0.074mm less than 5 parts of the particulate material of 1mm, less than 25 parts of the particulate material of 0.074mm; Add wedding agent and mix for 2.5 parts, go out to grind material after the mixing and after the 8mm sieve aperture sieves, be sent to the board moulding.The combined binder that described wedding agent paraffin and alkene are formed, the alkene add-on is weight percent (1-15) % of paraffin.
(3) moulding: when length is that tip-tap 5～6 times, weight 6～7 times are suppressed in adobe more than the 380mm with 630 tons of friction presses; Suppress with 800 tons of brick pressing machines for the mark shaped brick when the brick type, tip-tap 3 times is beaten again 3～4 times.
(4) stack bricks: after the ejection, the Quality Inspector writes down molding time, and the passed examination article neatly are placed on the drying cart; Before stacking bricks, the kiln car face is with MgO95% magnesia pad 20～30mm of 2～4mm, and scrapes the flatcar face; The adobe piling is taked to keep flat, and levels up storage period＜4 hour between adobe and the adobe with 0.5mm highly-purity magnesite particulate material; Adorned adobe storage period＜1 hour of kiln car, green brick forming is gone into tunnel in 8 hours and is burnt till, the studying in France of quirk: limit quirk 140～150mm, internal-quirk 80 ± 5mm.
(5) burn till: firing temperature:
The konite brick firing temperature
Go-cart 90 minutes/car pitch time, 1620～1630 ℃ are burnt till parking stall total time 90 minutes * 4=360 branch, promptly six hours.
Dewaxing:
The konite brick dewaxing is most of to be accomplished in 2#, 3# parking stall.Generally advancing behind the car had blue flare in 30～40 minutes, and the whole dewaxing time had less car little fire burns to occur in the 3# parking stall between 90～100 minutes, required the preheating zone temperature to be listed in the table below.
Preheating zone temperature (1-5 car)
(6) selection and detection: final dimension permissible variation and outward appearance selection are carried out according to Zhongxing Mining Group Co., Ltd., Liaoning's company standard (YB/T5011-1997).
The size of high-quality konite brick and appearance requirement
The physical and chemical index requirement of high-quality konite brick
(7) waxdip packing: finished bricks is flooded paraffin after the block-by-block passed examination, wax liquid temperature is in the time of 100 ℃; The brick temperature is comparatively suitable between 80 ± 5 ℃, and promptly the temperature difference should be controlled between 20～25 ℃, each 50 minutes waxdip time; After the waxdip, carry out plastic packaging, packing paper between brick and the brick; Vacuumize packing, add siccative before sealing.
Embodiment 2
(1) raw material pulverizing screening fine grinding: CaO＞55%, MgO＞41% konite sand is broken in crusher, process 3～5 mm, 1～3 mm and three kinds of particles of 0.3～1 mm respectively; The big crystallization electrosmelted magnesite clinker of MgO＞98% is broken in crusher, process 1～3 mm and two kinds of particles of＜1 mm respectively, and extract wherein the part clout out with Raymond machine fine grinding one-tenth＜0.074mm fine powder.
(2) proportioning and mixing: add by ratio of weight and the number of copies CaO＞55%, MgO＞41% konite sand more than or equal to 3mm less than 15 parts of the particulate material of 5mm, more than or equal to 1mm less than 10 parts of the particulate material of 3 mm, more than or equal to 0.3mm less than 15 parts of the particulate material of 1mm; Add the big crystallization electrosmelted magnesite clinker of MgO＞98% more than or equal to 1mm less than 25 parts of the particulate material of 3mm, more than or equal to 0.074mm less than 10 parts of the particulate material of 1mm, less than 25 parts of the particulate material of 0.074mm; Add wedding agent and mix for 2.5 parts, go out to grind material after the mixing and after the 8mm sieve aperture sieves, be sent to the board moulding.The combined binder that described wedding agent paraffin and alkene are formed, the alkene add-on is weight percent (15-30) % of paraffin;
(3) moulding: when length is that tip-tap 5～6 times, weight 6～7 times are suppressed in adobe more than the 380mm with 630 tons of friction presses; Suppress with 800 tons of brick pressing machines for the mark shaped brick when the brick type, tip-tap 3 times is beaten again 3～4 times.
(4) stack bricks: after the ejection, the Quality Inspector writes down molding time, and the passed examination article neatly are placed on the drying cart; Before stacking bricks, the kiln car face is with MgO95% magnesia pad 20～30mm of 2～4mm, and scrapes the flatcar face; The adobe piling is taked to keep flat, and levels up storage period＜4 hour between adobe and the adobe with 0.5mm highly-purity magnesite particulate material; Adorned adobe storage period＜1 hour of kiln car, green brick forming is gone into tunnel in 8 hours and is burnt till, the studying in France of quirk: limit quirk 140～150mm, internal-quirk 80 ± 5mm.
(5) burn till: firing temperature:
The konite brick firing temperature
Go-cart 90 minutes/car pitch time, 1620～1630 ℃ are burnt till parking stall total time 90 minutes * 4=360 branch, promptly six hours.
Dewaxing:
The konite brick dewaxing is most of to be accomplished in 2#, 3# parking stall.Generally advancing behind the car had blue flare in 30～40 minutes, and the whole dewaxing time had less car little fire burns to occur in the 3# parking stall between 90～100 minutes, required the preheating zone temperature to be listed in the table below.
Preheating zone temperature (1-5 car)
(6) selection and detection: final dimension permissible variation and outward appearance selection are carried out according to Zhongxing Mining Group Co., Ltd., Liaoning's company standard (YB/T5011-1997).
The size of high-quality konite brick and appearance requirement
The physical and chemical index requirement of high-quality konite brick
(7) waxdip packing: finished bricks is flooded paraffin after the block-by-block passed examination, wax liquid temperature is in the time of 100 ℃; The brick temperature is comparatively suitable between 80 ± 5 ℃, and promptly the temperature difference should be controlled between 20～25 ℃, each 50 minutes waxdip time; After the waxdip, carry out plastic packaging, packing paper between brick and the brick; Vacuumize packing, add siccative before sealing.
Claims (1)
1. a refining low-carbon (LC) used for ultra-low-carbon steel high-quality is burnt till konite brick; It is characterized in that; It is raw material that this high-quality is burnt till konite brick employing CaO＞55%, the konite sand of MgO＞41% and the big crystallization electrosmelted magnesite clinker of MgO＞98%; Add wedding agent, through raw material pulverizing screening fine grinding, proportioning and mix, moulding, stack bricks, burn till, choose and pack the production high-quality with detection, waxdip and burn till konite brick;
(1) raw material pulverizing screening fine grinding: CaO＞55%, MgO＞41% konite sand is broken in crusher, process respectively more than or equal to 3mm less than the particle of 5mm, more than or equal to 1mm less than the particle of 3mm with more than or equal to the particle of 0.3mm less than 1mm; The big crystallization electrosmelted magnesite clinker of MgO＞98% is broken in crusher or Raymond machine, process respectively more than or equal to 1mm less than the particle of 3mm, more than or equal to 0.074mm less than the particle of 1mm with less than the particle of 0.074mm;
(2) proportioning and mixing: add by ratio of weight and the number of copies CaO＞55%, MgO＞41% konite sand more than or equal to 3mm less than 15～20 parts of the particulate material of 5mm, more than or equal to 1mm less than 10～15 parts of the particulate material of 3 mm, more than or equal to 0.3mm less than 10～20 parts of the particulate material of 1mm; Add the big crystallization electrosmelted magnesite clinker of MgO＞98% more than or equal to 1mm less than 20～25 parts of the particulate material of 3mm, more than or equal to 0.074mm less than 5～10 parts of the particulate material of 1mm, less than 20～30 parts of the particulate material of 0.074mm, add wedding agent and mix for 2～4 parts; The combined binder that described wedding agent paraffin and alkene are formed, the alkene add-on is weight percent (1-30) % of paraffin;
And then through moulding, stack bricks, burn till, choose and the completion of detection, waxdip packaging step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101935182A CN102701766A (en) | 2012-06-12 | 2012-06-12 | High-quality sintered konite brick for refining low-carbon ultra-low carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101935182A CN102701766A (en) | 2012-06-12 | 2012-06-12 | High-quality sintered konite brick for refining low-carbon ultra-low carbon steel |
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| Publication Number | Publication Date |
|---|---|
| CN102701766A true CN102701766A (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101935182A Pending CN102701766A (en) | 2012-06-12 | 2012-06-12 | High-quality sintered konite brick for refining low-carbon ultra-low carbon steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018496A (en) * | 2019-12-06 | 2020-04-17 | 马鞍山利尔开元新材料有限公司 | Carbon-free magnesium dolomite slide plate and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1164518A (en) * | 1996-09-17 | 1997-11-12 | 董宽志 | Formula of caustic dolomite sand tar refractory brick and its production method |
| CN1266827A (en) * | 2000-03-28 | 2000-09-20 | 营口青花集团有限公司 | Immersed-in-wax burnt conite brick and its making process |
| CN1800083A (en) * | 2005-09-01 | 2006-07-12 | 营口青花耐火材料股份有限公司 | Anti-hydrated dolomite burnt brick and production process |
-
2012
- 2012-06-12 CN CN2012101935182A patent/CN102701766A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1164518A (en) * | 1996-09-17 | 1997-11-12 | 董宽志 | Formula of caustic dolomite sand tar refractory brick and its production method |
| CN1266827A (en) * | 2000-03-28 | 2000-09-20 | 营口青花集团有限公司 | Immersed-in-wax burnt conite brick and its making process |
| CN1800083A (en) * | 2005-09-01 | 2006-07-12 | 营口青花耐火材料股份有限公司 | Anti-hydrated dolomite burnt brick and production process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018496A (en) * | 2019-12-06 | 2020-04-17 | 马鞍山利尔开元新材料有限公司 | Carbon-free magnesium dolomite slide plate and preparation method and application thereof |
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Application publication date: 20121003 |