CN103864444B - A kind of converter automatic pushing off the slag slide gate nozzle slide brick and preparation method thereof - Google Patents
A kind of converter automatic pushing off the slag slide gate nozzle slide 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 slide brick and preparation method thereof, it is characterized in that: in this slide brick, the weight percentage of each component is: the plate diamond spar of 58% ~ 68%, 98 magnesia of 6% ~ 8%, 8% ~ 11% electric smelting spinel, 3% ~ 5% graphite, 4% ~ 7% a-alumina powder, the agglutinant of 1% ~ 2%, the aluminum silicon alloy powder of 4% ~ 7% and 4% ~ 5% resin.By said components by mixing, shaping, dry, burn till, oil immersion, roasting, machining process i.e. obtained novel converter automatic pushing off the slag slide gate nozzle slide brick.The formula of the present invention by adjustment slide brick, the production technique of simplification slide brick, improve the over-all properties of slide brick, the slag free tapping direct benefit of this slide 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 slide 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.Converter taphole slide plate is in tapping process, experience high-temperature molten steel, the brute force of slag washes away, frequent pushing off the slag operating process middle slide plate blowhole and slideway will bear high-temperature molten steel, the abrasion of slag and melting loss, in smelting process, blowhole is in full-gear, be subject to the direct impact oxidation of high temperature roaring flame, discontinuous steel of putting causes slide plate to stand 1600 DEG C of high temperature heat-flash shake impacts; So the damage mode of converter taphole slide plate be molten steel, slag wash away the impact oxidation of corroding expanding, high temperature roaring flame, the thermal shock crackle etc. that the plucking wearing and tearing of slipping plane, frequent high/low temperature conversion cause.Therefore converter furnace sliding plate requires that material must possess good high temperature break resistant intensity, excellent thermal shock resistance, preferably resistance to slag corrosion and good high-temperature oxidation resistance.
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 slide brick of good high temperature break resistant intensity, excellent thermal shock resistance, good resistance to slag corrosion and good high-temperature oxidation resistance 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 slide brick, is characterized in that: in this slide brick, the weight percentage of each component is: the plate diamond spar of 58% ~ 68%, 98 magnesia of 6% ~ 8%, 8% ~ 11% electric smelting spinel, 3% ~ 5% graphite, 4% ~ 7% a-alumina powder, the agglutinant of 1% ~ 2%, the aluminum silicon alloy powder of 4% ~ 7% and 4% ~ 5% resin.
The grain composition of described each component: plate diamond spar particle diameter is (2 ~ 1,1 ~ 0) mm, 98 magnesia diameters are 1 ~ 0mm, electric smelting spinel is 325 orders, graphite is 180 orders, a-alumina powder is 1 μm.
The grain composition of described plate diamond spar by weight percentage composition is:
2～1mm，30%～35%；
1～0mm，28%～33%。
A preparation method for novel converter automatic pushing off the slag slide gate nozzle slide brick, is characterized in that: in this slide brick, the weight percentage of each component is: the plate diamond spar of 58% ~ 68%, 98 magnesia of 6% ~ 8%, 8% ~ 11% electric smelting spinel, 3% ~ 5% graphite, 4% ~ 7% a-alumina powder, the agglutinant of 1% ~ 2%, the aluminum silicon alloy powder of 4% ~ 7% and 4% ~ 5% resin; The step of this preparation method is as follows:
A, to mix: each component is obtained pug by carrying out uniform stirring after said ratio mixing;
B, shaping: load weighted pug is added in mould, by friction press mechanical pressing and seasoning obtains adobe;
C, drying: adobe is put into kiln and slowly heat up dry 30 ~ 40 hours, drying temperature is no more than 200 DEG C;
D, to burn till: kiln temperature self-desiccation temperature is at the uniform velocity warming up to 970 ~ 1030 DEG C and is incubated 12 ~ 15 hours;
E, oil immersion: by the adobe after burning till temperature be 200 ~ 240 DEG C, pressure be the environment of 1.2 ~ 1.3Mpa under oil immersion 6 ~ 8 hours;
F, roasting: kiln is put in the adobe after oil immersion, be slowly warming up to 680 ~ 720 DEG C by kiln temperature, is incubated and naturally cools to room temperature after 12 ~ 15 hours;
G, machining: after the adobe after roasting being carried out hoop-driving, sheath body, grinding machine, packaging, namely obtain required novel converter automatic pushing off the slag slide gate nozzle slide brick.
The process of mixing in described step a is: first drop into particulate material plate diamond spar and 98 magnesia after muller start, resin is added after 3 ~ 5 minutes, fine powder material electric smelting spinel, graphite, a-alumina powder, agglutinant and aluminum silicon alloy powder is dropped into after mixing in 8 ~ 10 minutes, start after stirring 8 ~ 10 minutes again to pressurize 15 ~ 25 minutes, rear lifting muller discharging of having pressurizeed.
In process of mixing in described step a, the temperature of muller will remain on 20 ~ 35 DEG C.
Slow intensification drying process in described step c is: be incubated 10 ~ 15 hours after kiln temperature being evenly warmed up to 180 ~ 200 DEG C in 20 ~ 25 hours.
Sintering process in described steps d is: in 20 ~ 25 hours, kiln temperature self-desiccation temperature be at the uniform velocity warming up to 970 ~ 1030 DEG C and be incubated 12 ~ 15 hours.
Roasting process in described step f is: be incubated 12 ~ 15 hours after kiln temperature being at the uniform velocity warming up to 680 ~ 720 DEG C in 20 ~ 25 hours.
The grain composition of described each component: plate diamond spar particle diameter is (2 ~ 1,1 ~ 0) mm, 98 magnesia diameters are 1 ~ 0mm, electric smelting spinel is 325 orders, graphite is 180 orders, a-alumina powder is 1 μm.
The present invention has the following advantages compared to existing technology:
The formula of the present invention by adjustment slide brick, the production technique of simplification slide brick, further increase the over-all properties of slide brick, make it possess good high temperature break resistant intensity, excellent thermal shock resistance, preferably resistance to slag corrosion and good high-temperature oxidation resistance.
Slide 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 wherein after stove, lime consumption reduces 1.6kg/t by 3kg/t; Tap hole, ladle life are further enhanced, the tap hole life-span is up to 150 stoves, after using this slide brick, 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 slide brick to be 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.
Slide brick of the present invention is that fine steel grade exploitation provides favourable condition, and 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.
Slide brick of the present invention reduces the raw-material consumption such as alloy, lime and resistance to material when using, and 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 slide 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 slide 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 slide brick, in this slide brick, the weight percentage of each component is: the plate diamond spar of 58% ~ 68%, 98 magnesia of 6% ~ 8%, 8% ~ 11% electric smelting spinel, 3% ~ 5% graphite, 4% ~ 7% a-alumina powder, the agglutinant of 1% ~ 2%, the aluminum silicon alloy powder of 4% ~ 7% and 4% ~ 5% resin; The grain composition of above-mentioned each component: plate diamond spar particle diameter is (2 ~ 1,1 ~ 0) mm, 98 magnesia diameters are 1 ~ 0mm, electric smelting spinel is 325 orders, graphite is 180 orders, a-alumina powder is 1 μm; Wherein the grain composition of plate diamond spar by weight percentage composition be: the plate diamond spar 28% ~ 33% of the plate diamond spar 30% ~ 35%, 1 ~ 0mm of 2 ~ 1mm.The product that agglutinant can select Xinxiang Rong Xinnai material company limited to produce.
The preparation method of a kind of novel converter automatic pushing off the slag slide gate nozzle slide brick, in this slide brick, the weight percentage of each component is: the plate diamond spar of 58% ~ 68%, 98 magnesia of 6% ~ 8%, the electric smelting spinel of 8% ~ 11%, the graphite of 3% ~ 5%, the a-alumina powder of 4% ~ 7%, the agglutinant of 1% ~ 2%, the aluminum silicon alloy powder of 4% ~ 7% and the resin of 4% ~ 5%, the grain composition of each component: plate diamond spar particle diameter is (2 ~ 1, 1 ~ 0) mm, 98 magnesia diameters are 1 ~ 0mm, electric smelting spinel is 325 orders, graphite is 180 orders, a-alumina powder is 1 μm, wherein the grain composition of plate diamond spar by weight percentage composition be: the plate diamond spar 30% ~ 35% of 2 ~ 1mm, the plate diamond spar 28% ~ 33% of 1 ~ 0mm, the step of this preparation method is as follows: a, mix: each component is obtained pug by carrying out uniform stirring after said ratio mixing, the detailed process of mixing is: first drop into particulate material plate diamond spar and 98 magnesia after muller start, resin is added after 3 ~ 5 minutes, fine powder material electric smelting spinel, graphite, a-alumina powder, agglutinant and aluminum silicon alloy powder is dropped into after mixing in 8 ~ 10 minutes, start after stirring 8 ~ 10 minutes again to pressurize 15 ~ 25 minutes, pressurizeed the discharging of rear lifting muller, the temperature of muller will remain on 20 ~ 35 DEG C in addition, b, shaping: according to brick shape drawing, mould to be installed, before shaping, corresponding pug weight is taken by precalculating theoretical volume density, determine green brick forming biasing strength, cycle and forming pressure, detection has the substandard products such as flawless, truncation, unfilled corner, fusion hole, interlayer, then load weighted pug is added in mould, by friction press mechanical pressing and seasoning obtain adobe, c, drying: adobe is put into kiln and slowly heat up dry 30 ~ 40 hours, drying temperature is no more than 200 DEG C, concrete slowly intensification drying process is: be incubated 10 ~ 15 hours after kiln temperature being evenly warmed up to 180 ~ 200 DEG C in 20 ~ 25 hours, d, to burn till: kiln temperature self-desiccation temperature is at the uniform velocity warming up to 970 ~ 1030 DEG C and is incubated 12 ~ 15 hours, detailed process is: in 20 ~ 25 hours, kiln temperature self-desiccation temperature be at the uniform velocity warming up to 970 ~ 1030 DEG C and be incubated 12 ~ 15 hours, e, oil immersion: by the adobe after burning till temperature be 200 ~ 240 DEG C, pressure be the environment of 1.2 ~ 1.3Mpa under oil immersion 6 ~ 8 hours, f, roasting: kiln is put in the adobe after oil immersion, kiln temperature is slowly warming up to 680 ~ 720 DEG C, be incubated and naturally cool to room temperature after 12 ~ 15 hours, concrete roasting process is: be incubated 12 ~ 15 hours after kiln temperature being at the uniform velocity warming up to 680 ~ 720 DEG C in 20 ~ 25 hours, g, machining: after the adobe after roasting being carried out hoop-driving, sheath body, grinding machine, packaging, namely obtain required novel converter automatic pushing off the slag slide gate nozzle slide brick.
Embodiment one
The preparation method of a kind of novel converter automatic pushing off the slag slide gate nozzle slide brick, choosing weight percentage is: particle diameter is the plate diamond spar 30% of 2 ~ 1mm, particle diameter is the plate diamond spar 33% of 1 ~ 0mm, particle diameter is 98 magnesia 6% of 1 ~ 0mm, 325 object electric smelting spinels 8%, 180 object graphite 4%, the a-alumina powder 4% of 1 μm, agglutinant 1%, the resin of aluminum silicon alloy powder 5% and 4%, prepare burden according to the amount of agitation of 500 kilograms, every machine, first automatization pressure-regulating lifting muller is opened, then particulate material plate diamond spar and 98 magnesia are dropped into, resin is added after 3 minutes, fine powder material electric smelting spinel is dropped into after mixing in 8 ~ 10 minutes, graphite, a-alumina powder, agglutinant and aluminum silicon alloy powder, start after stirring 8 ~ 10 minutes again to pressurize 25 minutes, namely rear lifting muller discharging of having pressurizeed obtains pug, the temperature of muller will remain on 28 DEG C in addition, according to brick shape drawing, mould is installed, before shaping, corresponding pug weight is taken by precalculating theoretical volume density, determine green brick forming biasing strength, cycle and forming pressure, detection has the substandard products such as flawless, truncation, unfilled corner, fusion hole, interlayer, then load weighted pug is added in mould, adopt high tonnage automatization friction press shaping with the stability guaranteeing adobe and seasoning obtain adobe, kiln is put in adobe, and after kiln temperature being evenly warmed up to 180 DEG C in 20 hours, insulation carries out drying in 15 hours, in 25 hours, kiln temperature self-desiccation temperature is at the uniform velocity warming up to 1000 DEG C and is incubated 14 hours and sinter, by the adobe after burning till temperature be 200 ~ 240 DEG C, pressure be the environment of 1.2 ~ 1.3Mpa under oil immersion 6 ~ 8 hours, kiln is put in adobe after oil immersion, in 20 hours, kiln temperature is slowly warming up to 720 DEG C, be incubated and carry out roasting after 13 hours, after roasting completes, naturally cool to room temperature, adobe after roasting is carried out the machining process such as hoop-driving, sheath body, grinding machine, packaging, i.e. obtained required novel converter automatic pushing off the slag slide gate nozzle slide brick.
Embodiment two
The preparation method of a kind of novel converter automatic pushing off the slag slide gate nozzle slide brick, choosing weight percentage is: particle diameter is the plate diamond spar 32% of 2 ~ 1mm, particle diameter is the plate diamond spar 28% of 1 ~ 0mm, particle diameter is 98 magnesia 7% of 1 ~ 0mm, 325 object electric smelting spinels 10%, 180 object graphite 5%, the a-alumina powder 6% of 1 μm, agglutinant 2%, the resin of aluminum silicon alloy powder 6% and 5%, prepare burden according to the amount of agitation of 500 kilograms, every machine, first automatization pressure-regulating lifting muller is opened, then particulate material plate diamond spar and 98 magnesia are dropped into, resin is added after 4 minutes, fine powder material electric smelting spinel is dropped into after mixing in 8 ~ 10 minutes, graphite, a-alumina powder, agglutinant and aluminum silicon alloy powder, start after stirring 8 ~ 10 minutes again to pressurize 20 minutes, namely rear lifting muller discharging of having pressurizeed obtains pug, the temperature of muller will remain on 25 DEG C in addition, according to brick shape drawing, mould is installed, before shaping, corresponding pug weight is taken by precalculating theoretical volume density, determine green brick forming biasing strength, cycle and forming pressure, detection has the substandard products such as flawless, truncation, unfilled corner, fusion hole, interlayer, then load weighted pug is added in mould, adopt high tonnage automatization friction press shaping with the stability guaranteeing adobe and seasoning obtain adobe, kiln is put in adobe, and after kiln temperature being evenly warmed up to 190 DEG C in 22 hours, insulation carries out drying in 12 hours, in 24 hours, kiln temperature self-desiccation temperature is at the uniform velocity warming up to 1030 DEG C and is incubated 12 hours and sinter, by the adobe after burning till temperature be 200 ~ 240 DEG C, pressure be the environment of 1.2 ~ 1.3Mpa under oil immersion 6 ~ 8 hours, kiln is put in adobe after oil immersion, in 25 hours, kiln temperature is slowly warming up to 700 DEG C, be incubated and carry out roasting after 15 hours, after roasting completes, naturally cool to room temperature, adobe after roasting is carried out the machining process such as hoop-driving, sheath body, grinding machine, packaging, i.e. obtained required novel converter automatic pushing off the slag slide gate nozzle slide brick.
Embodiment three
The preparation method of a kind of novel converter automatic pushing off the slag slide gate nozzle slide brick, choosing weight percentage is: particle diameter is the plate diamond spar 35% of 2 ~ 1mm, particle diameter is the plate diamond spar 30% of 1 ~ 0mm, particle diameter is 98 magnesia 8% of 1 ~ 0mm, 325 object electric smelting spinels 11%, 180 object graphite 5%, the a-alumina powder 5% of 1 μm, agglutinant 1.5%, the resin of aluminum silicon alloy powder 7% and 4%, prepare burden according to the amount of agitation of 500 kilograms, every machine, first automatization pressure-regulating lifting muller is opened, then particulate material plate diamond spar and 98 magnesia are dropped into, resin is added after 5 minutes, fine powder material electric smelting spinel is dropped into after mixing in 8 ~ 10 minutes, graphite, a-alumina powder, agglutinant and aluminum silicon alloy powder, start after stirring 8 ~ 10 minutes again to pressurize 15 minutes, namely rear lifting muller discharging of having pressurizeed obtains pug, the temperature of muller will remain on 30 DEG C in addition, according to brick shape drawing, mould is installed, before shaping, corresponding pug weight is taken by precalculating theoretical volume density, determine green brick forming biasing strength, cycle and forming pressure, detection has the substandard products such as flawless, truncation, unfilled corner, fusion hole, interlayer, then load weighted pug is added in mould, adopt high tonnage automatization friction press shaping with the stability guaranteeing adobe and seasoning obtain adobe, kiln is put in adobe, and after kiln temperature being evenly warmed up to 200 DEG C in 25 hours, insulation carries out drying in 10 hours, in 20 hours, kiln temperature self-desiccation temperature is at the uniform velocity warming up to 970 DEG C and is incubated 15 hours and sinter, by the adobe after burning till temperature be 200 ~ 240 DEG C, pressure be the environment of 1.2 ~ 1.3Mpa under oil immersion 6 ~ 8 hours, kiln is put in adobe after oil immersion, in 23 hours, kiln temperature is slowly warming up to 680 DEG C, be incubated and carry out roasting after 12 hours, after roasting completes, naturally cool to room temperature, adobe after roasting is carried out the machining process such as hoop-driving, sheath body, grinding machine, packaging, i.e. obtained required novel converter automatic pushing off the slag slide gate nozzle slide brick.
The product obtained according to above-mentioned three embodiments is alkaline magnalium carbon spinel slide brick, and the average physical and chemical index of the slide brick that above-mentioned three embodiments obtain is as shown in the table:
Magnalium carbon spinel slide plate has following performance: a) erosion resistance: product is longitudinally expanding less, aperture rule, and effective stroke there will not be serious plucking phenomenon; B) wearability: slide plate uses several times at highly aggressive steel grade, there will not be serious plucking, coarse phenomenon; C) resistance to heat shocks: aperture place is without serious peeling phenomenon, and crackle seldom and very little; D) scale resistance: can not produce after use and be directed at the serious tissue fragility of slide plate because of oxidation, in blushing; E) thermal expansivity: slide plate in use there will not be and to cause because expanded by heating is excessive slide plate to dismantle the situations such as difficulty, and can back and forth slip freely.The free oxygen level of converter tapping is higher, slag action strong, and temperature reaches about 1650 DEG C.Because the oxygen in converter molten steel and the carbon in slide plate react, lose carbon because of oxidation and form metamorphic layer, short texture, is washed off by steel and damages; Al in slide plate
2o
3react with the FeO (MnO) in slag and molten steel and generate eutectic and cause chemical erosion.Because common alkaline slide plate has good erosion resistance, to corrodibility slag, high-oxygen steel and calcium treated steel have good resistance to fouling, but the reasons such as this material slide plate coefficient of thermal expansion is large cause its thermal shock resistance poor, potential safety hazard can be there is during use, so my company is in order to maximize favourable factors and minimize unfavourable ones, do a large amount of test works, in order to improve the work-ing life of coverter pig slide plate in highly aggressive steel grade, based on Al_2O_3-C based, be high-purity magnesium oxide and electric smelting spinel by the raw material substitution of its partial oxidation aluminium, proved by a large amount of uses: in Ca process steel and high-oxygen steel use, demonstrate the erosion resistance equal with magnesium carbon, with Al_2O_3-C based, there is equal heat-shock resistance.The damage of slide plate in tapping process arranged by corrosive action of the slag, aluminium carbon obviously corrode by slag.By using the magnalium carbon spinel slide plate of erosion resistance, damage speed can reduce about 3 one-tenth.The damage of magnalium carbon spinel slide plate is adopted to be that caused by the erosion action by low melting point Mn-Si system combined oxidation, its damage speed can reduce about 1/3 compared with aluminum-carbon sliding for high-oxygen steel.
After adopting slide 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 slide brick, tap hole, ladle life is further enhanced, the tap hole life-span is up to 150 stoves, after using this technology, 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 slide 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 slide 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 slide 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 slide 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 slide 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 (7)
1. a preparation method for converter automatic pushing off the slag slide gate nozzle slide brick, is characterized in that: in this slide brick, the weight percentage of each component is: the plate diamond spar of 58% ~ 68%, 98 magnesia of 6% ~ 8%, 8% ~ 11% electric smelting spinel, 3% ~ 5% graphite, 4% ~ 7% Alpha-alumina micro mist, the agglutinant of 1% ~ 2%, the aluminum silicon alloy powder of 4% ~ 7% and 4% ~ 5% resin; The step of this preparation method is as follows:
A, to mix: each component is obtained pug by carrying out uniform stirring after said ratio mixing;
B, shaping: load weighted pug is added in mould, by friction press mechanical pressing and seasoning obtains adobe;
C, drying: adobe is put into kiln and slowly heat up dry 30 ~ 40 hours, drying temperature is no more than 200 DEG C;
D, to burn till: kiln temperature self-desiccation temperature is at the uniform velocity warming up to 970 ~ 1030 DEG C and is incubated 12 ~ 15 hours;
E, oil immersion: by the adobe after burning till temperature be 200 ~ 240 DEG C, pressure be the environment of 1.2 ~ 1.3MPa under oil immersion 6 ~ 8 hours;
F, roasting: kiln is put in the adobe after oil immersion, be slowly warming up to 680 ~ 720 DEG C by kiln temperature, is incubated and naturally cools to room temperature after 12 ~ 15 hours;
G, machining: after the adobe after roasting being carried out hoop-driving, sheath body, grinding machine, packaging, namely obtain required converter automatic pushing off the slag slide gate nozzle slide brick.
2. the preparation method of converter according to claim 1 automatic pushing off the slag slide gate nozzle slide brick, it is characterized in that: the process of mixing in described step a is: after muller start, first drop into particulate material plate diamond spar and 98 magnesia, resin is added after 3 ~ 5 minutes, fine powder material electric smelting spinel, graphite, Alpha-alumina micro mist, agglutinant and aluminum silicon alloy powder is dropped into after mixing in 8 ~ 10 minutes, start after stirring 8 ~ 10 minutes again to pressurize 15 ~ 25 minutes, rear lifting muller discharging of having pressurizeed.
3. the preparation method of converter according to claim 1 and 2 automatic pushing off the slag slide gate nozzle slide brick, is characterized in that: in the process of mixing in described step a, the temperature of muller will remain on 20 ~ 35 DEG C.
4. the preparation method of converter according to claim 1 automatic pushing off the slag slide gate nozzle slide brick, is characterized in that: the slow intensification drying process in described step c is: be incubated 10 ~ 15 hours after kiln temperature being evenly warmed up to 180 ~ 200 DEG C in 20 ~ 25 hours.
5. the preparation method of converter according to claim 1 automatic pushing off the slag slide gate nozzle slide brick, is characterized in that: the sintering process in described steps d is: in 20 ~ 25 hours, kiln temperature self-desiccation temperature be at the uniform velocity warming up to 970 ~ 1030 DEG C and be incubated 12 ~ 15 hours.
6. the preparation method of converter according to claim 1 automatic pushing off the slag slide gate nozzle slide brick, is characterized in that: the roasting process in described step f is: be incubated 12 ~ 15 hours after kiln temperature being at the uniform velocity warming up to 680 ~ 720 DEG C in 20 ~ 25 hours.
7. the preparation method of converter according to claim 1 automatic pushing off the slag slide gate nozzle slide brick, is characterized in that: the grain composition of described each component: plate diamond spar particle diameter be 2 ~ 1 and 1 ~ 0mm, 98 magnesia diameters be 1 ~ 0mm, electric smelting spinel is 325 orders, graphite is 180 orders, Alpha-alumina micro mist is 1 μm.
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| CN104193353B (en) * | 2014-08-04 | 2015-12-02 | 浙江自立股份有限公司 | A kind of plate diamond spar matter stuffing sand and preparation method thereof |
| CN107162604B (en) * | 2017-04-27 | 2021-03-05 | 无锡市南方耐材有限公司 | Medium-high temperature fired impregnation-free sliding plate brick and preparation method thereof |
| CN107903075B (en) * | 2017-11-13 | 2021-01-22 | 瑞泰马钢新材料科技有限公司 | Production and preparation method of air-permeable sliding plate brick for ladle |
| CN111807818A (en) * | 2020-06-29 | 2020-10-23 | 江苏悦展新型材料有限公司 | Magnesium-spinel sliding plate brick and preparation method thereof |
| CN112624743B (en) * | 2020-08-24 | 2022-11-04 | 河南熔金高温材料股份有限公司 | Sliding plate brick for blocking slag at converter steel tapping hole formed by casting and production method |
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| CN101747063A (en) * | 2008-11-27 | 2010-06-23 | 郑州东方三力耐火材料有限公司 | Aluminium-magnesia carbon brick and preparation method thereof |
| CN103113122A (en) * | 2013-03-18 | 2013-05-22 | 河南省伯马股份有限公司 | Sliding plate brick for casting high manganese steel |
| 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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| CN101747063A (en) * | 2008-11-27 | 2010-06-23 | 郑州东方三力耐火材料有限公司 | Aluminium-magnesia carbon brick and preparation method thereof |
| 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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