CN103864445B - A kind of converter automatic pushing off the slag slide gate nozzle water nozzle brick and preparation method thereof - Google Patents
A kind of converter automatic pushing off the slag slide gate nozzle water nozzle brick and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of novel converter automatic pushing off the slag slide gate nozzle water nozzle brick and preparation method thereof, it is characterized in that: in this nozzle brick, the weight percentage of each component is: 98 electrosmelted magnesite clinkers 55% ~ 75%, electric smelting spinel 10% ~ 15%, Guangxi soil 4% ~ 6%, carbon black 8% ~ 10%, aluminium powder 2% ~ 3%, metallic silicon power 2% ~ 4%, resol 4% ~ 5%.Said components can be obtained adobe by uniform stirring, pug mechanical pressing, oven drying, and adobe can obtain novel converter automatic pushing off the slag slide gate nozzle water nozzle brick through processing and packing.The formula of the present invention by adjustment nozzle brick, the production technique of simplification nozzle brick, improve the over-all properties of nozzle brick, the slag free tapping direct benefit of this nozzle brick is adopted to be 2.43 yuan/ton of steel, for fine steel grade exploitation provides favourable condition, therefore have very broad application prospects and significant economic and social benefits.
Description
Technical field
The present invention relates to a kind of novel converter automatic pushing off the slag slide gate nozzle water nozzle brick and preparation method thereof.
Background technology
Along with developing rapidly of steel industry, the requirement of user to steel product quality improves day by day.Therefore, the excellent product made from steel of production high quality, high technology content, high added value becomes the inevitable choice of iron and steel enterprise.Steel quality directly affects the performance of steel.The lower quantity of slag reduced in converter tapping process improves an important step of steel quality.How to reduce the technical barrier that the lower quantity of slag is long-standing problem steel industry in converter tapping process, become the restraining factors of converter smelting special steel, excellent steel.During converter steelmaking is produced, when smelting in stove, produce the slag of a large amount of molten state.These slags can flow in ladle along with the tapping of converter, cause disadvantageous effect: the life-span affecting ladle lining; Cause molten steel to return sulphur, rephosphorization, affect steel quality; The consumption of iron alloy after increase stove; Increase the consumption of subsequent handling synthetic slag; Extend the refining procedure treatment time.
As far back as 2000, Luxembourg, Germany, Japan and other countries iron and steel enterprise just adopted in large ladle furnace slide gate nozzle technology in converter.In view of this slide gate nozzle pushing off the slag technology reducing rephosphorization of molten steel, improve yield of alloy, reduce steel inclusion, improve molten steel cleanliness, reduce ladle dry slag, extend ladle work-ing life etc. in outstanding advantages.The steel such as domestic Fujian three steel, species abundance in Baosteel in Shanghai, Laigang shaped steel, Anyang steel mill enterprise successively adopts this technology, has a better effect.The development of national economy has driven the change of steel consumption structure.At present, increasing enterprise adopts converter producing special steel, and this proposes more and more higher requirement to low cost production cleanness steel water.With regard to converter steelmaking manufacturing enterprise, for producing the high added value steel such as IF steel, petroleum pipe steel, silicon steel, bearing steel, spring steel, lower quantity of slag when reducing converter tapping improves Cleanliness of Molten Steel, thus improve quality and the class of converter steel product, reduce the most effective approach of its production cost, converter slide gate pushing off the slag new technology is arisen at the historic moment in this context.
Within 1970, slag-blocking ball has been invented by Nippon Steel, utilizes its proportion between slag, flows into blocking tap hole time complete in ladle in tapping to block slag.On this basis, iron and steel enterprise of various countries, constantly exploring new pushing off the slag technology, successively develops tens kinds of slag stopping methods, comprises floating plug, pneumatic dreg blocking and gate valve pushing off the slag etc.The 210 tons of converters of Salzg-itte steel mill of Germany use a kind of slag-blocking apparatus at tap hole end hydraulic gate, and its pushing off the slag effect is compared with slag-blocking ball, and ladle roughing slag amount decreases 70%.The steel mill of domestic use gate valve type pushing off the slag technology is few.Use slag-blocking ball pushing off the slag when Baoshan Iron and Steel Company stock company first steelworks 3 block converter is gone into operation, when the second steelworks 2 block converter is gone into operation, take pneumatic dreg blocking.Within 2006, Baosteel all uses floating plug pushing off the slag instead on 5 block converters.In November, 2008, Baosteel have purchased converter furnace sliding plate gate valve type pushing off the slag technology to certain company domestic, tests, achieve good pushing off the slag effect in a steel-making No. 3 300 tons of converters.Use slag-blocking ball pushing off the slag when Baoshan Iron and Steel Company stock company first steelworks 3 block converter is gone into operation, when the second steelworks 2 block converter is gone into operation, take pneumatic dreg blocking.Within 2006, Baosteel all uses floating plug pushing off the slag instead on 5 block converters.In November, 2008, Baosteel have purchased converter furnace sliding plate gate valve type pushing off the slag technology to certain company domestic, tests, achieve good pushing off the slag effect in a steel-making No. 3 300 tons of converters.
Principle of work and the result of use of conventional pushing off the slag are as follows: the principle of work of slag retaining cap is for when tapping starts, slag is first through tap hole, and utilize slag retaining cap to close tap hole, during use, slag retaining cap has certain pushing off the slag effect to front slag, and it is invalid to control intermediary and later stages slag; The principle of work of soft floating plug closes tap hole for utilizing soft floating plug, and the soft floating plug of exotic materials bursts after slag is first by tap hole, and during use, soft floating plug can prevent tapping slag in early stage effectively, and it is invalid to control middle and later periods slag; The principle of work of slag-blocking ball (is generally 4.2 ~ 4.5g/cm3) for utilizing slag-blocking ball density between slag steel, tap hole is blocked at the end of tapping, enter in ladle to block converter slag, during use slag-blocking ball slag in front, mid-term is controlled invalid, simple to operate, with low cost, pushing off the slag shoots straight (50% ~ 70%), slag-blocking ball is that the mode of drifting with the tide moves to tap hole in converter, and pushing off the slag is unreliable; Semisphere floating plug is accurately navigated to tap hole for utilizing tail rod by the principle of work of slag blocking dart, ultimate principle is similar to slag-blocking ball, during use, slag blocking dart is invalid to slag control in early stage, compared with slag-blocking ball, can flexible proportion, the automatic accurate arrival predetermined position of energy, has certain suppression eddy current in mid-term slag effect, can reach more than 90% to later stage slag pushing off the slag success ratio; The principle of work of electromagnetic method is by the magnetic field of generation, molten steel is attenuated, make the suction vortex height reduction that above tap hole, molten steel produces, can effectively prevent slag from flowing out tap hole, during use, the electromagnetic method tapping time is long, the mammoth conveter tapping time needs more than 15 minutes, and labour productivity reduces greatly; The principle of work of slide gate nozzle method is open with machinery or hydraulic way or close tap hole, to reach pushing off the slag object, during use, slide gate nozzle method can control early stage and later stage slag most effectively, pushing off the slag success ratio can reach 100%, pushing off the slag is respond well, but its appliance arrangement is complicated, and cost is higher, and installing/dismounting is all inconvenient; The principle of work of pneumatic process flows out proofing unit for have employed slag, by to send and the element of Received signal strength and signal processor are formed, by the voltage change that secondary coil produces, the change that molten steel flows through tap hole flow can be measured, the pushing off the slag time can be controlled exactly, during use, pneumatic process controls invalid to early stage slag, has a clear superiority in swiftness, reliability and expense etc.But when during tapping, generation suction vortex causes slag to mix out, pushing off the slag bad grasp on opportunity, and work under bad environment, part replacement is frequent; The principle of work of infrared rays Lower proterozoic group is that the infrared wavelength utilizing different substances to send at different temperatures is different, differentiate molten steel and slag, during use, infrared rays Lower proterozoic group has a clear superiority in swiftness, reliability and expense etc., but can not stop converter slag.
Converter taphole slide gate nozzle, comprises tap hole inner nozzle, lower skateboard and the outer mouth of a river of tap hole on tap hole.Its principle of work is similar to steel ladle sliding water gap flow control system, is arranged on converter taphole body exterior, is opened and closed automatically by fluid power system and automatic Lower proterozoic group Systematical control slide plate, realizes the object of few slag, slag free tapping.Inner nozzle: in converter tapping process, high-temperature molten steel, the washing away of slag will be stood in inner nozzle, also will stand erosion and the infiltration of basic slag, oxidation is impacted in the baking that in converter steelmaking process, blowhole place in inner nozzle will stand high temperature roaring flame; Also to stand DEG C high temperature heat-flash shake of a few Baidu to 1600 during discontinuous tapping to impact.So the washing away and corrode of high-temperature molten steel, slag, high temperature oxidation is its main damage mode.The outer mouth of a river: the outer mouth of a river of converter taphole connects tap hole lower skateboard, its main Wear mechanism be washing away of molten steel and slag expanding, corrode infiltration, the severe thermal that oxidation is impacted and discontinuous tapping causes of thermal-flame damagedly ruins.Therefore the material of inner nozzle, outer nozzle brick must possess good anti-scour property, scour resistance, preferably high-temperature oxidation resistance and excellent heat-resistant knocking stability.
Summary of the invention
The object of the invention is for prior art Problems existing, provide a kind of and possess novel converter automatic pushing off the slag slide gate nozzle water nozzle brick of good anti-scour property, scour resistance, good high-temperature oxidation resistance and excellent heat-resistant knocking stability and preparation method thereof.
The object of the invention is to solve by the following technical programs:
A kind of novel converter automatic pushing off the slag slide gate nozzle water nozzle brick, is characterized in that: in this nozzle brick, the weight percentage of each component is: 98 electrosmelted magnesite clinkers 55% ~ 75%, electric smelting spinel 10% ~ 15%, Guangxi soil 4% ~ 6%, carbon black 8% ~ 10%, aluminium powder 2% ~ 3%, metallic silicon power 2% ~ 4%, resol 4% ~ 5%.
Described electrosmelted magnesite clinker: content of MgO >=98%, electric smelting spinel: Al2O3 content >=70%, content of MgO >=35%, Guangxi soil: Al2O3 content >=35%, SiO2 content >=45%, carbon black: C >=96%, metallic aluminium powder Al >=99%, metallic silicon power: Si content >=98%.
The grain composition of described each component: 98 electrosmelted magnesite clinker particle diameters are that (3 ~ 1,1 ~ 0) ㎜, electric smelting spinel is 325 orders, and Guangxi soil is 200 orders, and carbon black model is N330 type, and metallic aluminium powder is 325 orders, and metallic silicon power is 320 orders, and resol is liquid.
Particle and fine powder percentage composition by weight in component:
3～1㎜20～30%；
1～0㎜35～45%；
Fine powder 26 ~ 38%.
A preparation method for novel converter automatic pushing off the slag slide gate nozzle water nozzle brick, is characterized in that: in this nozzle brick, the weight percentage of each component is: 98 electrosmelted magnesite clinkers 55% ~ 75%, electric smelting spinel 10% ~ 15%, Guangxi soil 4% ~ 6%, carbon black 8% ~ 10%, aluminium powder 2% ~ 3%, metallic silicon power 2% ~ 4%, resol 4% ~ 5%; The step of this preparation method is as follows: each component is obtained pug by carrying out uniform stirring after said ratio mixing, pug mechanical pressing also puts into baking oven after seasoning, in 2 ~ 4 hours, oven temperature is evenly warmed up to 80 DEG C, then after oven temperature evenly being risen to 200 DEG C from 80 DEG C in 15 ~ 22 hours, be incubated and naturally cool to room temperature after 15 ~ 20 hours and can obtain adobe, adobe can obtain novel converter automatic pushing off the slag slide gate nozzle water nozzle brick through processing and packing.
Described electrosmelted magnesite clinker: content of MgO >=98%, electric smelting spinel: Al2O3 content >=70%, content of MgO >=35%, Guangxi soil: Al2O3 content >=35%, SiO2 content >=45%, carbon black: C >=96%, metallic aluminium powder Al >=99%, metallic silicon power: Si content >=98%.
The grain composition of described each component: 98 electrosmelted magnesite clinker particle diameters are that (3 ~ 1,1 ~ 0) ㎜, electric smelting spinel is 325 orders, and Guangxi soil is 200 orders, and carbon black model is N330 type, and metallic aluminium powder is 325 orders, and metallic silicon power is 320 orders, and resol is liquid.
Particle and fine powder percentage composition by weight in component:
3～1㎜20～30%；
1～0㎜35～45%；
Fine powder 26 ~ 38%.
The present invention has the following advantages compared to existing technology:
The formula of the present invention by adjustment nozzle brick, the production technique of simplification nozzle brick, further increase the over-all properties of nozzle brick, makes it possess good anti-scour property, scour resistance, preferably high-temperature oxidation resistance and excellent heat-resistant knocking stability.
Nozzle brick of the present invention effectively reduces the quantity of slag under converter tapping, and the upgrading lime of top slag and the consumption of synthetic slag must be reduced, and after statistics table open oven, lime consumption reduces 1.6kg/t by 3kg/t; Converter slag has strong oxidizing property in addition, time large during slag, exacerbate the chemical erosion of the resistance to material such as tap hole and ladle, tap hole age and ladle are reduced age, after using this nozzle brick, tap hole, ladle life are further enhanced, the tap hole life-span is up to 150 stoves, reduce costs 8.51 yuan/ton of steel, but equipment increases cost 3.89 yuan/ton of steel, resistance to material is increased in this 2.19 yuan/ton of steel, therefore adopt the slag free tapping direct benefit of this nozzle brick to be 8.51-3.89-2.19=2.43 yuan/ton of steel, calculate by by annual output 5000000 tons of steel, direct economic benefit 1,215 ten thousand yuan can be created.
The use of this nozzle brick provides favourable condition for fine steel grade exploitation: successfully develop ML steel series, medium and high carbon steel steel series and plate of moderate thickness steel series; Reduce waste product, improve quality, the molten steel avoiding slag rephosphorization to cause melts down, waste product, and significantly reduces the inclusion in steel, improves the quality of molten steel; The narrow composition and the narrow temperature that realize molten steel control, and the up-to-standard rate of producing fine quality steel is high and stable; Improve tap hole, ladle resistance to material life-span; Alleviate scarfing cinder labour intensity under stove; The tapping time stablizes, and is convenient to the control of production cycle and tapping temperature.The use of this nozzle brick simultaneously reduces the raw-material consumption such as alloy, lime and resistance to material, meets the industry policy that national energy-saving reduces discharging; And output of steel is when reaching capacity and occur competition situation, each iron and steel enterprise progressively will turn to the track paying attention to quality and cost, and the high-quality steel that profit will be selected more stable is produced; This nozzle brick meets the requirement of high-quality steel high quality, low cost, for bof process production high-quality steel is given security, achieve tapping process automatization, therefore this nozzle brick has very broad application prospects simultaneously, has significant economic and social benefits.
Embodiment
Below by embodiment, the present invention is further illustrated.
A kind of novel converter automatic pushing off the slag slide gate nozzle water nozzle brick, in this nozzle brick, the weight percentage of each component is: 98 electrosmelted magnesite clinkers 55% ~ 75%, electric smelting spinel 10% ~ 15%, Guangxi soil 4% ~ 6%, carbon black 8% ~ 10%, aluminium powder 2% ~ 3%, metallic silicon power 2% ~ 4%, resol 4% ~ 5%; Wherein electrosmelted magnesite clinker: content of MgO >=98%, electric smelting spinel: Al2O3 content >=70%, content of MgO >=35%, Guangxi soil: Al2O3 content >=35%, SiO2 content >=45%, carbon black: C >=96%, metallic aluminium powder Al >=99%, metallic silicon power: Si content >=98%; The grain composition of above-mentioned each component is as follows: 98 electrosmelted magnesite clinker particle diameters be (3 ~ 1,1 ~ 0) ㎜, electric smelting spinel is 325 orders, and Guangxi soil is 200 orders, carbon black model is N330 type, metallic aluminium powder is 325 orders, and metallic silicon power is 320 orders, and resol is liquid; And particle and fine powder percentage composition by weight in component:
3～1㎜20～30%；
1～0㎜35～45%；
Fine powder 26 ~ 38%.
A preparation method for novel converter automatic pushing off the slag slide gate nozzle water nozzle brick, in this nozzle brick, the weight percentage of each component is: 98 electrosmelted magnesite clinkers 55% ~ 75%, electric smelting spinel 10% ~ 15%, Guangxi soil 4% ~ 6%, carbon black 8% ~ 10%, aluminium powder 2% ~ 3%, metallic silicon power 2% ~ 4%, resol 4% ~ 5%; Wherein electrosmelted magnesite clinker: content of MgO >=98%, electric smelting spinel: Al2O3 content >=70%, content of MgO >=35%, Guangxi soil: Al2O3 content >=35%, SiO2 content >=45%, carbon black: C >=96%, metallic aluminium powder Al >=99%, metallic silicon power: Si content >=98%; The grain composition of above-mentioned each component is as follows: 98 electrosmelted magnesite clinker particle diameters be (3 ~ 1,1 ~ 0) ㎜, electric smelting spinel is 325 orders, and Guangxi soil is 200 orders, carbon black model is N330 type, metallic aluminium powder is 325 orders, and metallic silicon power is 320 orders, and resol is liquid; And particle and fine powder percentage composition by weight in component:
3～1㎜20～30%
1～0㎜35～45%
Fine powder 26 ~ 38%.
The step of this preparation method is as follows: each component is obtained pug by carrying out uniform stirring after said ratio mixing, pug mechanical pressing also puts into baking oven after seasoning, in 2 ~ 4 hours, oven temperature is evenly warmed up to 80 DEG C, then after oven temperature evenly being risen to 200 DEG C from 80 DEG C in 15 ~ 22 hours, be incubated and naturally cool to room temperature after 15 ~ 20 hours and can obtain adobe, adobe can obtain novel converter automatic pushing off the slag slide gate nozzle water nozzle brick through processing and packing.
Embodiment one
The preparation method of a kind of novel converter automatic pushing off the slag slide gate nozzle water nozzle brick, choosing weight percentage is: particle diameter is 98 electrosmelted magnesite clinkers 25% of 3 ~ 1 ㎜, particle diameter is 98 electrosmelted magnesite clinkers 45% of 1 ~ 0 ㎜, 325 object electric smelting spinels 10%, 200 object Guangxi soil 4%, the carbon black 8% of N330 type, 325 object aluminium powders 3%, 320 order metallic silicon powers 2%, resol 5%, wherein 98 electrosmelted magnesite clinkers are prepared burden after crushing and screening, drop in adding pressure type or high speed muller and mix 5 ~ 6 minutes, add phenolic resin binder, all have after one deck resin until particulate material and add electric smelting spinel again, Guangxi soil, carbon black, metallic aluminium powder, the premixing flour of metallic silicon power, mix discharging in 25 ~ 35 minutes, shaping employing more than 600 tons hydropress, according to the shape of brick, size, accurate weighing pug, load weighted pug adds in mould, be molded into specified dimension.Every block brick will measure physical dimension, external diameter, aperture, height tolerance, and per tour will spot-check the substance of 15%, takes a sample test that brick body is close, void content, and the defective phenomenon of all discoveries must be scrapped and search reason; Adobe after shaping generally just need can enter baking oven after seasoning, oven temperature was evenly warmed up to 80 DEG C by adobe in baking oven in 3 hours, then in 22 hours, temperature is evenly risen to from 80 DEG C the heating curve being incubated 15 hours 200 DEG C and carry out drying, naturally cool to room temperature, dried adobe just can carry out later process processing through the work in-process of passed examination, in order to improve the usability at the outer mouth of a river, prevent crackle from producing and expand, filling additional iron-clad with chamotte and can obtain novel converter automatic pushing off the slag slide gate nozzle water nozzle brick.
Embodiment two
The preparation method of a kind of novel converter automatic pushing off the slag slide gate nozzle water nozzle brick, choosing weight percentage is: particle diameter is 98 electrosmelted magnesite clinkers 20% of 3 ~ 1 ㎜, particle diameter is 98 electrosmelted magnesite clinkers 40% of 1 ~ 0 ㎜, 325 object electric smelting spinels 12%, 200 object Guangxi soil 6%, the carbon black 10% of N330 type, 325 object aluminium powders 2.5%, 320 order metallic silicon powers 4%, resol 4%, wherein 98 electrosmelted magnesite clinkers are prepared burden after crushing and screening, drop in adding pressure type or high speed muller and mix 5 ~ 6 minutes, add phenolic resin binder, all have after one deck resin until particulate material and add electric smelting spinel again, Guangxi soil, carbon black, metallic aluminium powder, the premixing flour of metallic silicon power, mix discharging in 25 ~ 35 minutes, shaping employing more than 600 tons hydropress, according to the shape of brick, size, accurate weighing pug, load weighted pug adds in mould, be molded into specified dimension.Every block brick will measure physical dimension, external diameter, aperture, height tolerance, and per tour will spot-check the substance of 15%, takes a sample test that brick body is close, void content, and the defective phenomenon of all discoveries must be scrapped and search reason; Adobe after shaping generally just need can enter baking oven after seasoning, oven temperature was evenly warmed up to 80 DEG C by adobe in baking oven in 4 hours, then in 20 hours, temperature is evenly risen to from 80 DEG C the heating curve being incubated 18 hours 200 DEG C and carry out drying, naturally cool to room temperature, dried adobe just can carry out later process processing through the work in-process of passed examination, in order to improve the usability at the outer mouth of a river, prevent crackle from producing and expand, filling additional iron-clad with chamotte and can obtain novel converter automatic pushing off the slag slide gate nozzle water nozzle brick.
Embodiment three
The preparation method of a kind of novel converter automatic pushing off the slag slide gate nozzle water nozzle brick, choosing weight percentage is: particle diameter is 98 electrosmelted magnesite clinkers 30% of 3 ~ 1 ㎜, particle diameter is 98 electrosmelted magnesite clinkers 35% of 1 ~ 0 ㎜, 325 object electric smelting spinels 15%, 200 object Guangxi soil 5%, the carbon black 8% of N330 type, 325 object aluminium powders 2%, 320 order metallic silicon powers 3%, resol 4.5%, wherein 98 electrosmelted magnesite clinkers are prepared burden after crushing and screening, drop in adding pressure type or high speed muller and mix 5 ~ 6 minutes, add phenolic resin binder, all have after one deck resin until particulate material and add electric smelting spinel again, Guangxi soil, carbon black, metallic aluminium powder, the premixing flour of metallic silicon power, mix discharging in 25 ~ 35 minutes, shaping employing more than 600 tons hydropress, according to the shape of brick, size, accurate weighing pug, load weighted pug adds in mould, be molded into specified dimension.Every block brick will measure physical dimension, external diameter, aperture, height tolerance, and per tour will spot-check the substance of 15%, takes a sample test that brick body is close, void content, and the defective phenomenon of all discoveries must be scrapped and search reason; Adobe after shaping generally just need can enter baking oven after seasoning, oven temperature was evenly warmed up to 80 DEG C by adobe in baking oven in 2 hours, then in 18 hours, temperature is evenly risen to from 80 DEG C the heating curve being incubated 20 hours 200 DEG C and carry out drying, naturally cool to room temperature, dried adobe just can carry out later process processing through the work in-process of passed examination, in order to improve the usability at the outer mouth of a river, prevent crackle from producing and expand, filling additional iron-clad with chamotte and can obtain novel converter automatic pushing off the slag slide gate nozzle water nozzle brick.
The product obtained according to above-mentioned three embodiments is alkaline magnalium carbon spinel nozzle brick, and the average physical and chemical index of the nozzle brick that above-mentioned three embodiments obtain is as shown in the table:
Material due to inner nozzle, outer nozzle brick must possess good anti-scour property, scour resistance, preferably high-temperature oxidation resistance and excellent heat-resistant knocking stability, therefore aggregate selects electrosmelted magnesite clinker and electric smelting spinel, its chemical stability, corrosion resistance, heat-shock resistance, high volume good stability; Matrix is selected chemical stability good and is had the mixture (carbon black, resol) of the multiple matrix materials such as the carbon materials of high-wearing feature, a certain amount of micro mist is added in order to improve sintering character, for preventing carbon material decarburization to be oxidized, add oxidation inhibitor (metallic aluminium powder, metallic silicon power); Resinous material carbon material to good wet performance selected by bonding agent, for increasing plasticity of slurry, improving processability, improving green strength, adds softening agent (Guangxi soil).Although magnesia mouth of a river resistance to fouling is better, but its heat-shock resistance is poor, C content increase is conducive to improving thermal shock resistance, carbon combines because carbon is oxidizable, cause short texture, cause and corrode aggravation, so the mouth of a river work-ing life must from improving its hot strength, improve anti-molten steel and slag perviousness, reduce SiO
2content is set about.
After adopting nozzle brick of the present invention, effectively reduce the quantity of slag under converter tapping, the upgrading lime of top slag and the consumption of synthetic slag must be reduced.After statistics table open oven, lime consumption reduces 1.6kg/t by 3kg/t; Converter slag has strong oxidizing property in addition, time large during slag, exacerbate the chemical erosion of the resistance to material such as tap hole and ladle, tap hole age and ladle are reduced age, after using this nozzle brick, tap hole, ladle life are further enhanced, the tap hole life-span is up to 150 stoves, reduce costs 8.51 yuan/ton of steel, but equipment increases cost 3.89 yuan/ton of steel, resistance to material is increased in this 2.19 yuan/ton of steel, therefore adopt the slag free tapping direct benefit of this nozzle brick to be 8.51-3.89-2.19=2.43 yuan/ton of steel, calculate by by annual output 5000000 tons of steel, direct economic benefit 1,215 ten thousand yuan can be created.
The use of this nozzle brick provides favourable condition for fine steel grade exploitation: successfully develop ML steel series, medium and high carbon steel steel series and plate of moderate thickness steel series; Reduce waste product, improve quality, the molten steel avoiding slag rephosphorization to cause melts down, waste product, and significantly reduces the inclusion in steel, improves the quality of molten steel; The narrow composition and the narrow temperature that realize molten steel control, and the up-to-standard rate of producing fine quality steel is high and stable; Improve tap hole, ladle resistance to material life-span; Alleviate scarfing cinder labour intensity under stove; The tapping time stablizes, and is convenient to the control of production cycle and tapping temperature.The use of this nozzle brick simultaneously reduces the raw-material consumption such as alloy, lime and resistance to material, meets the industry policy that national energy-saving reduces discharging; And output of steel is when reaching capacity and occur competition situation, each iron and steel enterprise progressively will turn to the track paying attention to quality and cost, and the high-quality steel that profit will be selected more stable is produced; This nozzle brick meets the requirement of high-quality steel high quality, low cost, for bof process production high-quality steel is given security, achieve tapping process automatization, therefore this nozzle brick has very broad application prospects simultaneously, has significant economic and social benefits.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention, and any change that technical scheme basis is done, all falls within scope; The technology that the present invention does not relate to all is realized by prior art.
Claims (2)
1. a preparation method for converter automatic pushing off the slag slide gate nozzle water nozzle brick, is characterized in that: in this nozzle brick, the weight percentage of each component is: in this nozzle brick, the weight percentage of each component is: 98 electrosmelted magnesite clinkers 55% ~ 75%, electric smelting spinel 10% ~ 15%, Guangxi soil 4% ~ 6%, carbon black 8% ~ 10%, aluminium powder 2% ~ 3%, metallic silicon power 2% ~ 4%, resol 4% ~ 5%; The grain composition of described each component: 98 electrosmelted magnesite clinker particle diameters are 3 ~ 1 ㎜, 1 ~ 0 ㎜, and electric smelting spinel is 325 orders, and Guangxi soil is 200 orders, and carbon black model is N330 type, and metallic aluminium powder is 325 orders, and metallic silicon power is 320 orders, and resol is liquid;
The step of this preparation method is as follows: each component is obtained pug by carrying out uniform stirring after said ratio mixing, pug mechanical pressing also puts into baking oven after seasoning, in 2 ~ 4 hours, oven temperature is evenly warmed up to 80 DEG C, then after oven temperature evenly being risen to 200 DEG C from 80 DEG C in 15 ~ 22 hours, be incubated and naturally cool to room temperature after 15 ~ 20 hours and can obtain adobe, adobe can obtain converter automatic pushing off the slag slide gate nozzle water nozzle brick through processing and packing.
2. the preparation method of converter according to claim 1 automatic pushing off the slag slide gate nozzle water nozzle brick, is characterized in that: described electrosmelted magnesite clinker: content of MgO>=98%, electric smelting spinel: Al
2o
3content>=70%, content of MgO>=35%, Guangxi soil: Al
2o
3content>=35%, SiO
2content>=45%, carbon black: C>=96%, metallic aluminium powder Al>=99%, metallic silicon power: Si content>=98%.
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| CN103319183A (en) * | 2012-07-26 | 2013-09-25 | 阳泉市东风耐火材料有限责任公司 | Sequence continuous casted AL2O3-SiO2-C metal composite sliding plate |
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| CN103864445A (en) | 2014-06-18 |
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