CN109593899A - The production technology of slag melting agent of refining furnace of molten steel - Google Patents

Abstract

The invention discloses a kind of production technologies of slag melting agent of refining furnace of molten steel, the following steps are included: (1) is in parts by weight, blender is added in atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, mineral wool, adhesive, add 22-30 parts of water simultaneously, 1-1.5h is stirred at revolving speed 300-500r/min, uniform sizing material is made；(2) uniform sizing material is added in mold, the particle that partial size is 0.8-1.2cm is made after vacuum filtering shape process；(3) particle is sent into baking oven, dry 8-10h, is made slagging agent at 82-93 DEG C.Contain low melting point, the atlapulgite powder of high activity, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder in slagging agent component of the invention, be conducive to slough the impurities such as hydrogen, the oxygen in molten steel, harmful element hydrogen, oxygen content in reduction steel, to improve the mechanical performance of 18 potassium steel of high-purity manganese.

Description

The production technology of slag melting agent of refining furnace of molten steel

Technical field

The invention belongs to high-performance new material and metallurgical technology fields, and in particular to a kind of life of slag melting agent of refining furnace of molten steel Production. art.

Background technique

Potassium steel liquid purity level directly affects casting quality, and oxide, field trash, gas content etc. are miscellaneous in potassium steel liquid The number of matter directly affects material capability.

Oxygen is one of the element of the segregation tendency most serious in the process of setting of steel, in the solidification and subsequent cooling of molten steel In the process, the solubility of oxygen sharply declines, and most oxygen of steel Central Plains dissolution are mingled with so that ferriferous oxide, oxysulfide etc. are fine The form of object is enriched with γ or α grain boundaries, these microinclusions will cause embrittlement of grain boundaries, make the processing and use process of steel In easily become the starting point of grain boundary separation, eventually lead to steel and brittle break occur.

The increase of oxygen content in steel can reduce the ductility, impact flexibility, antifatigue destructive characteristics of steel, improve steel it is tough- Crisp inversion temperature reduces the corrosion resistance of steel.In addition, oxygen-containing high steel are also easy to that aging occurs, in high temperature plus Working hour since the impurity segregation of grain boundaries forms low melting point nethike embrane, causes steel to generate hot-short.

Steel in cooling procedure hydrogen can also diffusional precipitation, since diffusion velocity is very slow in solid steel, only minimal amount expand It is scattered to continuous casting billet (or steel ingot) surface, majority is to diffuse into the aperture in microscopic pores or near field trash or on crystal boundary In, form hydrogen molecule.Since constantly KH value very little, pH2 but very greatly, cause hydrogen molecule under the place aggregation of precipitation, low temperature The internal stress of steel.This internal stress has been more than the intensity pole of steel along with the summation of structural stress, thermal stress, distortional stress etc. Limit, will rupture to form crackle.

The effects of in potassium steel liquid fusion process because of air-breathing, oxidation, cause in potassium steel liquid that there are a certain number of oxygen Compound, non-metallic inclusion, pernicious gas etc. need to be to melting potassium steel to guarantee that potassium steel liquid forms casting with pure state Liquid carries out refining purified treatment, reaches clean-up effect.

The manufacture craft of clean steel mainly has three both at home and abroad at present:

1) blast furnace-cast steel liquid pretreatment-converter-external refining (LF, RH).This process need to configure the outer essence of furnace Equipment is refined, and process is cumbersome, it is complicated for operation；

2) ultra high power, high power electric arc furnace (EAF) --- external refining (LF, RH).This process is also required to match External refining equipment is set, and more demanding to raw material；

3) vacuum induction furnace (VIF) and electroslag remelting (ESR).The vacuum smelting equipment investment that this process uses Greatly, and remelting need to consume electricity big.

Country's smelting equipment and technique majority use non-oxidizing process smelting technology at present, but the system of refining potassium steel at present Have the disadvantage in that first is that the degradation degree that argon gas in potassium steel liquid sublimate treatment process cannot be detected to furnace lining, selection compared with Good argon pressure and flow, causes higher cost；Second is that when the potassium steel water of fusing exudation furnace lining is connected with furnace shell, it cannot It avoids wearing the generation of furnace accident well；Third is that refining potassium steel purified treatment oxygen and hydrogen effect are poor, the quality of product is influenced；Fourth is that It is of poor quality to refine air brick used in the system of potassium steel, influences Argon effect, to influence purified steel water oxygen and hydrogen Clean-up effect.

Currently, the steel ladle bottom argon blowing air brick used both at home and abroad be mostly it is processed by 1500 DEG C, not only burn into This height, and the production cycle is long, and correspondingly, production cost is higher.In order to shorten the production cycle, and reach energy-saving and emission-reduction, drop is originally The purpose of consumption reduction, some research institutions and enterprise both domestic and external have started the research for not burning steel ladle bottom argon blowing air brick, but into Exhibition and effect are all undesirable.At abroad, mainly saturating using steel ladle bottom argon blowing is not burnt by the Very few companies of representative of Vesuvius Gas brick technology, but they are added to steel fibre in product formula mostly, and the quality stability of product, but this are improved with this Sample one lessens the damage performance against corrosion of product.

Use slagging agent during refining potassium steel, can a degree of reduction pernicious gas, such as oxygen, hydrogen etc., but It is existing slagging agent using becoming sticky, being hardened long afterwards, containment wall especially packet bead is easy to dross, can containment wall in spite of wound in scarfing cinder Refractory material makes its service life decline to a great extent；Gluing steel slag really up to the mark excessively simultaneously makes temperature-measuring gun insertion bore become smaller, and is inserted into pipe outer wall Slagging shell becomes extremely difficult across slag blanket.Traditional method is to take the measure of skimming, and reduces thickness of slag layer.But it is excessive to skim Can make molten steel surface that secondary oxidation occur, while liquid steel temperature decline can be made to accelerate, can not also solve the excessively viscous impurity of slag can not on Floating and ladle not dry slag the problems such as, only alleviate the speed of steel wall dry slag.

Summary of the invention

The present invention provides a kind of production technology of slag melting agent of refining furnace of molten steel, to solve how to reduce oxygen, hydrogen content, improves The actual techniques problem of the comprehensive mechanical performance of potassium steel.

In order to solve the above technical problems, the invention adopts the following technical scheme:

A kind of production technology of slag melting agent of refining furnace of molten steel, comprising the following steps:

(1) in parts by weight, by atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, Blender is added in mineral wool, adhesive, while adding 22-30 parts of water, stirs 1-1.5h at revolving speed 300-500r/min, is made uniform Slurry；

(2) uniform sizing material made from step (1) is added in mold, it is 0.8- that partial size is made after vacuum filtering shape process The particle of 1.2cm；

(3) particle made from step (2) is sent into baking oven, dry 8-10h, is made slagging agent at 82-93 DEG C.

Further, atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorite in step (1) Powder, mineral wool, adhesive as unit of parts by weight, specifically: 25-53 parts of atlapulgite powder, 7-13 parts of talcum powder, palygorskite powder 10-16 parts, 4-6 parts of montmorillonite powder, 32-64 parts of calcium lime powder, 9-15 parts of fluorspar powder, 5-8 parts of mineral wool, 1-2 parts of adhesive.

Further, atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorite in step (1) Powder, mineral wool, adhesive as unit of parts by weight, specifically: 42 parts of atlapulgite powder, 10 parts of talcum powder, 12 parts of palygorskite powder, cover De- 5 parts of mountain flour, 55 parts of calcium lime powder, 13 parts of fluorspar powder, 7 parts of mineral wool, 1.6 parts of adhesive.

Further, the quality index of the atlapulgite powder raw material are as follows: SiO₂: 59.16-62.34%；Al₂O₃: 17.24-18.36%；MgO:3.61-5.44%；CaO:1.65-2.09%；Granularity is 800-1000 mesh.

Further, the quality index of the talcum powder raw material are as follows: SiO₂: 58.34-62.01%；MgO:27.52- 31.36%；Granularity is 1200-1300 mesh.

Further, the quality index of the palygorskite powder raw material are as follows: SiO₂: 52.68-56.96%；MgO:23.83- 27.19%；Granularity is 1000-1100 mesh.

Further, the quality index of the montmorillonite powder raw material are as follows: SiO₂: 55.17-65.28%；Al₂O₃: 12.31- 25.43%；Granularity is 800-1000 mesh.

Further, the quality index of the calcium lime powder raw material are as follows: CaO: >=96.32%；Granularity is 600-800 mesh.

Further, the quality index of the fluorite powder raw material are as follows: CaF₂: >=72.36%；Granularity is 600-800 mesh.

Further, the slagging agent is applied to preparation high-purity potassium steel, comprising the following steps:

(1) knotting crucible: being mounted on system bottom for air brick as required, then uses furnace lining material and mold knotting earthenware Crucible, drying and sintering；

(2) gaseous diffuser is manufactured and designed according to electric induction furnace volume size, gaseous diffuser is by chromium, magnesia or corundum Refractory material is designed to optimize air-flow and have anti-metal with the molding of fluid pressure type high-temperature baking, its granularity of gaseous diffuser Penetrability；

(3) gaseous diffuser is mounted on induction furnace bottom centre, connects blowing argon gas system, blowing argon gas system is by argon gas Bottle, pressure reducing valve, flow regulator, pressure-resistant rubber hose, union, which are linked in sequence, to be formed；

(4) prepare material: by the chemical analysis requirement of cast steel water, weighing a variety of materials of melting cast steel water, it is spare；

(5) feed melting: melting in ready material step by step input furnace is cast when load melting formation molten bath When molten steel covered furnace bottom 30cm, flow regulator insufflation argon gas is started to open, argon gas participates in casting molten steel mistake by air brick Journey, as melting continues, the pressure and flow of blowing argon gas increase with the increase of cast steel water, and specific control process is as follows: preceding 8-13min, the control of Argon atmospheric pressure are controlled in 6.2-6.4kg, argon flow in 16-17L/min；14-20min, blowing argon gas Pressure control is controlled in 6.5-6.7kg, argon flow in 17.1-17.3L/min；21-30min, the control of Argon atmospheric pressure exist 6.8-7kg, argon flow are controlled in 17.4-17.6L/min；When 31min starts, Xiang Zhugang water surface covers slagging agent, Additive amount is 0.82-0.95kg/t.s, i.e., 0.82-0.95 kilograms of slagging agent is added in molten steel per ton；31-52min, Argon Atmospheric pressure control is controlled in 6.3-6.5kg, argon flow in 17.2-17.4L/min；Until furnace charge is melting down, in sampling analysis furnace Composition；

(6) chemical analysis is adjusted: according to sampling analysis as a result, calculating and being added adjustment material to whole fusings；

(7) calm in furnace: power failure is calm after cast steel liquid reaches requirement temperature in furnace, continues blowing argon gas, makes cast steel liquid samming Homogeneous, impurity, gas sufficiently float, in conjunction with liquid level slagging agent；

(8) temperature control is tapped: high-purity potassium steel is made in control temperature, steel tapping casting.

Technical principle and effect of the invention:

(1) slagging agent of the proportion by improvement, which has compared with low melting point and high activity, in the item that intermediate frequency furnace is smelted Clinker Hen melts fastly under part, sufficiently takes part in metallurgical reaction, and the abilities such as deoxidation and hydrogen, removal impurity are strong.

(2) refining period makes new slag, and molten steel in the stove can sufficiently participate in slag interface reaction, and molten steel is filled in purification for argon and steel slag Divide abundant deoxygenation and hydrogen under reaction dual effect and removes field trash.

(3) present invention uses induction furnace refining molten steel, in atmospheric conditions blowing argon gas, it is possible to reduce external refining equipment is thrown Money simplifies refinery practice operating process；Argon gas is a kind of inert gas, it is not dissolved in molten steel, is not also sent out with the element in steel It is biochemical reaction and form field trash, do not pollute molten steel；The air brick of argon gas through the invention is blown into molten steel, and air brick makes argon Bubble is tiny and full and uniform dispersion, and when argon gas passes through molten steel, [H] that dissolves in molten steel, [O] etc. can be spread automatically, enters Rise in Argon Bubble with bubble and excluded from molten steel, non-metallic inclusion is then adhered on inert gas, and conjugate is floating to steel Liquid surface, then adheres in slagging agent, thus cleaning molten steel；Blowing argon gas refining can uniform molten steel chemical analysis and molten steel temperature； It since specific gravity of argon gas is big, is precipitated in molten steel after melting down, forms layer protecting film on molten steel face and cover molten steel.

(4) contain low melting point, the atlapulgite powder of high activity, talcum powder, palygorskite powder, montmorillonite in slagging agent component Powder, calcium lime powder, fluorspar powder are conducive to slough the impurities such as hydrogen, the oxygen in molten steel, the harmful element and impurity in reduction steel Content reaches slag absorbing effect, greatly improves the quality of molten steel, is conducive to that high-purity wear-resistant material is made, while reducing slagging agent Dosage, reduce cost.

(5) 18 potassium steel preparation process of high-purity manganese of the invention, effectively reduces oxygen, hydrogen content, improves potassium steel Comprehensive mechanical performance.

Detailed description of the invention

Fig. 1 is present invention preparation 18 potassium steel system structure diagram of high-purity manganese.

Specific embodiment

It to facilitate a better understanding of the present invention, is illustrated by following embodiment, these embodiments belong to of the invention Protection scope, but do not limit the scope of the invention.

The preparation process of 18 potassium steel of high-purity manganese, including prepare 18 potassium steel system of high-purity manganese design and The control of technological parameter, ingredient.

(1) design preparation 18 potassium steel system of high-purity manganese

As shown in Figure 1, comprising: furnace shell 1, furnace lining 2, furnace wall layer (crucible) 3, pedestal 4, gaseous diffuser 5, air brick 6, into Tracheae 7, union 8, furnace body protection contact 9, contact holder 10, conducting wire 11, bell 12, flow regulator 13, pressure reducing valve 14, Argon bottle 15, the furnace shell 1 are wrapped in furnace lining 2, and 2 outer surface of furnace lining is provided with furnace wall layer 3, and the bottom of the furnace shell 1 is set It is equipped with pedestal 4, gaseous diffuser 5 and air brick 6 are provided with above the pedestal 4, the air brick 6 is wrapped in gaseous diffuser 5, the air inlet pipe 7 is connect with gaseous diffuser 5, and the union 8 is connected with air inlet pipe 7 and is fixed on pedestal 4, the furnace Body protects contact 9, contact holder 10, conducting wire 11 to form furnace lining protective device, and the furnace body protection contact 9 is embedded in furnace lining 2 Interior, the contact holder 10 is connected with furnace body protection contact 9 by conducting wire 11, and the bell 12 is set to refining potassium steel The top of system, the air inlet pipe 7 connect flow regulator 13, and the flow regulator 13 connects pressure reducing valve 14, the decompression Valve 14 connects argon bottle 15.

The furnace wall layer 3 is layer of composite material resistant to high temperature.

The layer of composite material resistant to high temperature is 5:3:2 by silicon carbide, aluminium oxide diamond dust and ferrosilicon material by weight It is made.

The layer of composite material resistant to high temperature is with a thickness of 0.8cm.

The air inlet pipe 7 is pressure-resistant rubber hose.

The internal diameter of the pressure-resistant rubber hose is 0.3cm.

The furnace body protection contact 9 is made of nonmagnetic steel material.

The furnace body protection contact 9 is provided with 6.

The air brick, as unit of parts by weight, including following raw material: particle radius is the magnesium olive of 1.62-2.31mm 12-18 parts of forsterite sand that 30-42 parts of stone sand, particle radius are 1.08-1.62mm, particle radius are 0.83-1.08mm's 10-16 parts of fused magnesite that 18-26 parts of forsterite sand, particle radius are 1.34-1.98mm, particle radius 0.92- 7-12 parts of fused magnesite that 5-9 parts of fused magnesite, the particle radius of 1.34mm is 0.75-0.92mm, particle radius 1.56- 12-18 parts of the corundum of 2.08mm, 5-8 parts of 4-7 parts of corundum, magnesium silicate cement, the particle radius that particle radius is 1.12-1.56mm Disperse water-reducing agent for 4-8 parts of 3-5 parts of sodium metasilicate, sodium permanganate, the additive 0.2-0.5 parts explosion-proof, polycarboxylic acids of 1.03-3.16nm 0.4-0.9 parts, 10-15 parts of water；

Forsterite sand MgO: >=the 43.46% of three kinds of variable grain radiuses；SiO₂: 36.81-39.72%；

Fused magnesite MgO: >=the 98.12% of three kinds of variable grain radiuses；

The emergy Al of described two variable grain radiuses₂O₃: >=97.43%；

The explosion-proof additive is explosion-proof fiber, and using polypropylene as raw material, fiber number is 10-18 danier, and length is 3.21-6.02mm；

The preparation method of the air brick, comprising the following steps:

S1, ingredient: aforementioned component and parts by weight preparation raw material are pressed；

S2, premix: it by the prepared raw material merging pre-mixing apparatus of step S1, is stirred in the case where revolving speed is 200-300r/min Premix is made in 20-25min；

S3, vibration moulding: by premix made from step S2 move into mold in, using hydraulic press at 100-120MPa at Air brick green compact are made in type；

S4, curing in the mold: air brick green compact made from step S3 are placed at 35-45 DEG C, and band mold conserves 4-8h；

S5, demoulding: it after the completion of step S4 band mold maintenance, demoulds at normal temperature, air brick green body is made；

S6, maintenance: air brick green body made from step S5 is placed at 30-32 DEG C and conserves 20-30h；

S7, baking: the air brick green body after the completion of step S6 maintenance is placed at 400-500 DEG C and is toasted 3-5 days, has been toasted At rear obtained air brick finished product.

Air brick technology of preparing principle and effect of the present invention:

(1) forsterite sand is basic refractory, has high temperature resistant, anti-etch, good chemical stability, the sand Refractoriness (1710 DEG C) with higher and anti-metal oxidative attack ability expand slowly under high-temperature, and are less than deformation, do not have There are the characteristics of expanding suddenly, good thermal shock, casting is not easy to produce main folder sand defect.

(2) the advantages that fused magnesite is basic refractory, has compact structure, and resistance to slag is strong, good thermal shock stability.

(3) corundum is basic refractory, has volume stability good, and minimum reheating is shunk, and good thermal shock is stablized The advantages that property and bending strength.

(4) magnesium silicate cement is used as a kind of adhesive.

(5) sodium metasilicate is nanometer materials, after air brick introduces nanometer sodium metasilicate, is formed and is evenly distributed inside air brick Micro- stomata, this can effectively prevent crackle in use process and continues to spread, to improve air brick toughness, reduces and peel off, reach To the purpose improved service life, the ability that molten steel is corroded and washed away is resisted in use and is obviously improved, it is ventilative after the completion to pour steel Brick surface dry slag seldom even not dry slag, anti-strip effect is good, and this reduces the labor intensity of field worker, brings good Good social benefit.

(6) sodium permanganate is added when preparing air brick, the sodium permanganate of addition can decompose during brickmaking, in blank Gas is generated inside system, is made rich in hole inside blank, so that the gas permeability of product be made to further increase.

(7) explosion-proof additive is explosion-proof fiber, it is uniformly mixed with other refractory materials, after forming, is toasted, with Baking temperature constantly increases, and fiber starts softening, shrinks, fusing when reaching certain temperature, eventually forms stomata and is carbonized, it In air brick distribution form small network stomata, it can open air vent channel, mitigate internal stress, prevent from bursting, thus Improve the safety coefficient in refining process.

(8) polycarboxylic acids is added and disperses water-reducing agent, play the role of dispersion, make magnesium silicate cement, nanometer sodium metasilicate, Gao Meng Sour sodium, explosion-proof additive are fully dispersed, in addition also reduce the amount of water in air brick manufacturing process, have saved water resource, add Fast rate of drying, shortens the production cycle of air brick.

(9) the straight stomata of air brick of the invention is few, angle of wetting is big, not permeable steel, anti-melting loss, can increase substantially air brick Service life improves the turnover rate of ladle and the service life of tank lining, reduces to reduce the replacement number of air brick The labor intensity of field worker and pollution to environment.

(10) air brick of the invention can form equally distributed thin stomata, and Air permenbility is slit, disperse formula air brick 1.5 times or more, argon gas is spread in molten steel by countless stomatas, hence it is evident that the purifying rate for improving molten steel reduces in molten steel The content of oxygen and hydrogen；Solving scarfing cinder iron burning oxygen causes a small amount of straight gross porosity and argon gas to be concentrated through molten steel and run away on liquid level quickly The problems such as, hence it is evident that improve the purifying rate of molten steel.

(11) air brick of the invention can avoid generating gap and the ventilative vertical masonry joint of brick body because melting when air brick iron sheet high temperature It penetrates into molten steel and causes bleed-out accident, improve the safety coefficient in refining process.

(12) air brick is made using forsterite sand, fused magnesite, corundum etc. as alkaline refractory raw material in the present invention, with Molten steel is not susceptible to the advantage of chemical reaction, selects main material of the magnesium carbon materials matter as ladle air brick, utilizes hydraulic press Big pressure and pressure uniformity when molding, preparation density is big, compression strength is big air brick, solve air brick make the service life it is short, Worker must repeatedly replace the problems such as air brick, reduce labor intensity of workers, guarantee that ladle continuously has enough to meet the need and save steel-making fire resisting Material cost.

(13) present invention is using the different solid forsterite sand of particle radius, fused magnesite, corundum ball as main bone The air brick for expecting production, does not add any pore creating material, utilizes the forsterite sand, fused magnesite, corundum ball of variable grain radius Body theory of close packing constitutes the disperse stomata of connection, and forsterite sand, fused magnesite, corundum ball shape are different from common magnesium olive Particle made of olive stone sand, fused magnesite, corundum are broken, it has purity is high, high temperature resistant, high pressure resistant, hot almost close to sphere The features such as stability is good is shaken, therefore, the technical problem to be solved in the present invention can satisfy using the air brick that these raw materials produce.

(14) air brick of the invention solve in product, low temperature intensity it is low, there are intensity inflection points for medium temperature；Product is each The volume of temperature section is unstable, and crackle is easy to produce in use process；Use of the using effect of product than being burnt into product is not burnt The technical problems such as effect difference.

(15) air brick of the invention is suitable with firing product with service performance, and reduced firing cost >=1300 yuan/ The advantages that ton, production cycle >=5 day of shortening.

(16) air brick prepared by the present invention is through detecting: flexural strength conservation rate is 76.3-85.1%, 1100 DEG C of water coolings Thermal shock > 47 time, service life > 35 time.

(2) control of high-purity manganese 18 potassium steel technological parameter, ingredient is prepared

The use technique simplified process for preparing 18 potassium steel system of high-purity manganese is as follows:

Knotting crucible --- manufactures and designs gaseous diffuser --- connection blowing argon gas system --- preparing material --- charging --- adjustment chemical analysis is --- calm in furnace ---, and temperature control goes out molten steel for melting.

Specific implementation method:

(1) knotting crucible: being mounted on system bottom for air brick as required, then uses furnace lining material and mold knotting earthenware Crucible, drying and sintering；

(2) gaseous diffuser is manufactured and designed according to electric induction furnace volume size, gaseous diffuser is by chromium, magnesia or corundum Refractory material is designed to optimize air-flow and have anti-metal with the molding of fluid pressure type high-temperature baking, its granularity of gaseous diffuser Penetrability；

(3) gaseous diffuser is mounted on induction furnace bottom centre, connects blowing argon gas system, blowing argon gas system is by argon gas Bottle, pressure reducing valve, flow regulator, pressure-resistant rubber hose, union, which are linked in sequence, to be formed；

(4) prepare material: by the chemical analysis requirement of cast steel water, weighing a variety of materials of melting cast steel water, it is spare；

(5) feed melting: melting in ready material step by step input furnace is cast when load melting formation molten bath When molten steel covered furnace bottom 31cm, flow regulator insufflation argon gas is started to open, argon gas participates in casting molten steel mistake by air brick Journey, as melting continues, the pressure and flow of blowing argon gas increase with the increase of cast steel water, and specific control process is as follows: preceding 8-13min, the control of Argon atmospheric pressure are controlled in 6.2-6.4kg, argon flow in 16-17L/min；14-20min, blowing argon gas Pressure control is controlled in 6.5-6.7kg, argon flow in 17.1-17.3L/min；21-30min, the control of Argon atmospheric pressure exist 6.8-7kg, argon flow are controlled in 17.4-17.6L/min；When 31min starts, Xiang Zhugang water surface covers slagging agent, Additive amount is 0.86-0.92kg/t.s, i.e., 0.82-0.95 kilograms of slagging agent is added in molten steel per ton；31-52min, Argon Atmospheric pressure control is controlled in 6.3-6.5kg, argon flow in 17.2-17.4L/min；Until furnace charge is melting down, in sampling analysis furnace Composition；

(6) chemical analysis is adjusted: according to sampling analysis as a result, calculating and being added adjustment material to whole fusings；

(7) calm in furnace: power failure is calm after cast steel liquid reaches requirement temperature in furnace, continues blowing argon gas, makes cast steel liquid samming Homogeneous, impurity, gas sufficiently float, in conjunction with liquid level slagging agent；

(8) temperature control is tapped: 18 potassium steel of high-purity manganese is made in control temperature, steel tapping casting, described using spectrum analysis 18 potassium steel of high-purity manganese, based on mass percentage, including following component: C, 15.0-22.0%'s of 0.80-1.80% Cr, 0.05-2.8%'s of S, 0.03-3.5% of P, 0.02-0.04% of Si, 0.012-0.045% of Mn, 0.3-0.9% O, 0.0002- of Al, 0.0007-0.0013% of Cu, 0.014-0.096% of Ni, 0.06-2.3% of Mo, 0.02-2.5% 0.00045% H, remaining micronutrient levels≤0.94%, surplus Fe.

The ingredient of 18 potassium steel of high-purity manganese is acted on or is influenced:

C is the essential element for influencing steel alloy hardness and toughness, and carbon amounts is high, then carbide quantity is more, the hardness of steel alloy Height, but toughness reduces, it is easily broken in use；And carbon amounts is low, then toughness is higher, but carbide quantity is reduced, and hardness reduces, no Content conducive to abrasion, therefore carbon needs strict control.

The main function of Mn is refinement metallic matrix, but excessively high Mn content will make occur austenite in Cast Steels, no Conducive to anti impact wear-proof, therefore Mn content needs strict control.

Si is the essential element for improving carbide structure and form, and Si amount is high to facilitate the MC that eutectic carbide is in high rigidity Type structure helps to improve carbide morphology, but excessively high si content will reduce toughness, therefore Si content is also required to strictly control System.

P is harmful element, increases the cold brittleness of steel, welding performance is made to degenerate, and reduces plasticity, cold-bending property is made to degenerate, because This reduces the quality that P content is conducive to improve product.

S is harmful element, so that steel is generated red brittleness, reduces the ductility and toughness of steel, cause to split in forging and rolling Line, therefore reduce the quality that S content is conducive to improve product.

Cr amount is high, easily forms M3C7 type carbide, is conducive to improve its wearability, but excessively high Cr amount can make the tough of cast steel Property reduce, and production cost is excessively high, therefore Cr content is also required to strict control.

The main function of Mo is thinning microstructure, improves the intensity and toughness of matrix, increases the harden ability of steel, therefore Mo content needs Want strict control.

Ni can improve the intensity of steel, and good plasticity and toughness, Ni is kept to have higher corrosion resistance to soda acid, There are antirust and temperature capacity at high temperature.

Outstanding role of the Cu in steel is the weather-resistant performance for improving ordinary low-alloy steel, is especially made with phosphorus cooperation Used time, Cu, which is added, can also improve the intensity and yield ratio of steel, and be not adversely influenced to welding performance.

Al can refine the grain structure of steel, suppress the timeliness of mild steel, improve the toughness of steel at low temperature, moreover it is possible to improve steel Inoxidizability, improve wearability and fatigue strength of steel etc..

O is one of the element of the segregation tendency most serious in the process of setting of steel, in the solidification and subsequent cooling of molten steel In the process, the solubility of O sharply declines, and most O of steel Central Plains dissolution are with microinclusions such as iron O compound, sulphur O compounds Form is enriched with γ or α grain boundaries, these microinclusions will cause embrittlement of grain boundaries, make to hold in the processing and use process of steel The starting point for easily becoming grain boundary separation eventually leads to steel and brittle break occurs.

The increase of O content can reduce the ductility, impact flexibility, antifatigue destructive characteristics of steel in steel, improve the tough-crisp of steel Inversion temperature reduces the corrosion resistance of steel.In addition, the steel containing O high are also easy to that aging occurs, in high temperature process Since the impurity segregation of grain boundaries forms low melting point nethike embrane, steel is caused to generate hot-short.Therefore O content is reduced to be conducive to improve production The quality of product.

Steel in cooling procedure H can also diffusional precipitation, since diffusion velocity is very slow in solid steel, only minimal amount spread To continuous casting billet (or steel ingot) surface, majority is to diffuse into the aperture in microscopic pores or near field trash or on crystal boundary, Form H molecule.Since constantly KH value very little, pH2 but very greatly, cause the interior of steel to H molecule under the place aggregation of precipitation, low temperature Stress.This internal stress has been more than the strength degree of steel along with the summation of structural stress, thermal stress, distortional stress etc., will Rupture forms crackle.Therefore the quality that H content is conducive to improve product is reduced.

Using above method melting, can uniformly cast steel liquid chemical analysis and casting molten steel temperature, improve cast steel liquid metallurgy matter Amount.

Slagging agent described in step (5), as unit of parts by weight, including following raw material: 25-53 parts of atlapulgite powder is slided 7-13 parts of mountain flour, 10-16 parts of palygorskite powder, 4-6 parts of montmorillonite powder, 32-64 parts of calcium lime powder, 9-15 parts of fluorspar powder, mineral wool 5-8 Part, 1-2 parts of adhesive；

The quality index of the atlapulgite powder raw material are as follows: SiO₂: 59.16-62.34%；Al₂O₃: 17.24-18.36%； MgO:3.61-5.44%；CaO:1.65-2.09%；Granularity is 800-1000 mesh；

The quality index of the talcum powder raw material are as follows: SiO₂: 58.34-62.01%；MgO:27.52-31.36%；Granularity For 1200-1300 mesh；

The quality index of the palygorskite powder raw material are as follows: SiO₂: 52.68-56.96%；MgO:23.83-27.19%；Grain Degree is 1000-1100 mesh；

The quality index of the montmorillonite powder raw material are as follows: SiO₂: 55.17-65.28%；Al₂O₃: 12.31-25.43%；Grain Degree is 800-1000 mesh；

The quality index of the calcium lime powder raw material are as follows: CaO: >=96.32%；Granularity is 600-800 mesh；

The quality index of the fluorite powder raw material are as follows: CaF₂: >=72.36%；Granularity is 600-800 mesh；

Described adhesive is tapioca；Granularity is 400-600 mesh；

The preparation method of the slagging agent, comprising the following steps:

(1) in parts by weight, by atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, Blender is added in mineral wool, adhesive, while adding 22-30 parts of water, stirs 1-1.5h at revolving speed 300-500r/min, is made uniform Slurry；

(2) uniform sizing material made from step (1) is added in mold, it is 0.8- that partial size is made after vacuum filtering shape process The particle of 1.2cm；

(3) particle made from step (2) is sent into baking oven, dry 8-10h, is made slagging agent at 82-93 DEG C.

The technical principle and effect of slagging agent of the present invention:

(1) atlapulgite main chemical compositions are aluminum oxide, silica, water and a small amount of iron, magnesium, calcium etc., are to use Clay (mainly bentonite) is raw material, is handled through inorganic acidifying, then through water rinsing, dry manufactured adsorbent, there is higher suction Attached property performance is conducive to adsorb the impurities such as oxygen, the hydrogen in molten steel.Furthermore atlapulgite is heated to 300 DEG C or more and just starts to lose Decrystallize water, and structure is made to change, therefore has lower fusing point.(2) talcum powder, which has, helps stream, fire resistance, strong adsorption force Etc. excellent physical characteristic, be conducive to adsorb the impurities such as oxygen, the hydrogen in molten steel.It is main to contain magnesia and silica, additionally contain The impurity such as aluminium oxide, fusing point are about 800 DEG C, and fusing point is lower.(3) palygorskite has very big specific surface area and adsorption capacity, very Good rheological characteristic and catalytic performance, meanwhile, there is ideal colloidal property and heat resistance, be a kind of preferable adsorbent material, Be conducive to adsorb the impurities such as oxygen, the hydrogen in molten steel.It is also heat-barrier material and expanding material, the fuel factor in heating process: 90- 150 DEG C, lose absorption water and zeolite water；240-300 DEG C, lose the crystallization water；450-520 DEG C, lattice watter is lost, exothermic effect exists It is the material of low melting point between 900-1000 DEG C.(4) montmorillonite is to press from both sides one layer altogether by two layers of tetrahedral si-o film that top couples altogether Aluminium (magnesium) oxygen (hydrogen-oxygen) octahedral sheet of rib connection, constitutes silicate mineral of the 2:1 type containing the crystallization water, is that a kind of good heat is swollen Swollen material, volume can increase after heating, have very strong adsorption capacity and cation exchange property, be conducive to adsorb in molten steel The impurities such as oxygen, hydrogen.(5) the CaO component of calcium lime powder can control ladle basicity of slag in slagging agent, be realize molten steel desulfurizing and Reduce the important constituent element that molten steel reoxidizes pollution.Too high or too low CaO content cannot all control the basicity of slagging agent well. (6) in slagging agent montmorillonite etc. SiO₂Component is another key factor of slagging agent basicity control, the SiO in slag₂Content needs Strict control is wanted, it is too high or too low all to influence the suction-operated of the control and slagging agent of slagging agent basicity to field trash.(7) it melts The Al of atlapulgite in slag agent₂O₃The control of content mainly for make slagging agent have the preferably suction to field trash in molten steel Attached ability, and the physical property such as the mobility of slagging agent are had an important influence on.Excessively high Al₂O₃Content can make Al₂O₃Into in molten steel New field trash is formed, slagging agent physical property, too low Al are deteriorated₂O₃Content can then be such that the suction-operated of field trash weakens, therefore need Want strict control Al₂O₃Content.(8) in slagging agent fluorspar powder CaF₂The physical property in order to improve ladle slag, reduce its fusing point and Viscosity improves its mobility, to be conducive to the progress of metallurgical reaction, excessively high CaF₂Content can make slagging agent too dilute, influence It is the service life of refractory material, also unfavorable to the control of slagging agent basicity and field trash adsorption capacity.(9) talcum powder in slagging agent MgO protects the refractory material of ladle liner, reduces erosion of the ladle slag to ladle and RH processing unit refractory material, excessively high Content of MgO makes slagging agent viscosity too big, is unfavorable for the progress of metallurgical reaction, and protection fire resisting is then not achieved in too low content of MgO The purpose of material.(10) intumescent materials and the mineral wools such as palygorskite, montmorillonite are added in slagging agent component, and slagging agent is made The light thermal-insulation particle form in molten steel slag layer surface can be directly launched, persistently keeps the temperature in favor of being suspended in liquid level, effectively subtracts Scattering and disappearing for few molten steel skin temperature, to not have to ladle covering agent, is effectively reduced production cost；(11) contain in slagging agent component Low melting point, the atlapulgite powder of high activity, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, are conducive to slough The impurities such as hydrogen, oxygen in molten steel reduce the content of the harmful element and impurity in steel, reach slag absorbing effect, greatly improve steel The quality of water is conducive to that high-purity wear-resistant material is made, while reducing the dosage of slagging agent, reduces cost.(12) present invention adopts With atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder preparation slagging agent have low melting point, The advantages of high activity, the additive amount in molten steel per ton is only 0.82-0.95kg, greatly reduces production cost.

It is illustrated below by more specific embodiment.

(1) research and development of air brick

Embodiment 1

A kind of air brick, as unit of parts by weight, including following raw material: particle radius is the magnesium olive of 1.62-2.31mm The magnesium olive that 12 parts of forsterite sand that 32 parts of stone sand, particle radius are 1.08-1.62mm, particle radius are 0.87-1.08mm The fused magnesite 6 that 11 parts of fused magnesite that 20 parts of stone sand, particle radius are 1.34-1.79mm, particle radius are 0.92-1.34mm Part, particle radius be 0.81-0.92mm 12 parts of fused magnesite, particle radius be 1.56-2.08mm 12 parts of corundum, particle half 3 parts of sodium metasilicate that 4 parts of the corundum that diameter is 1.07-1.56mm, 5 parts of magnesium silicate cement, particle radius are 1.52-2.94nm, Gao Meng 5 parts of sour sodium, 0.2 part of explosion-proof additive, polycarboxylic acids disperse 0.4 part of water-reducing agent, 12 parts of water；

Forsterite sand MgO: >=the 43.46% of three kinds of variable grain radiuses；SiO₂: 36.92-39.27%；

Fused magnesite MgO: >=the 98.35% of three kinds of variable grain radiuses；

The emergy Al of described two variable grain radiuses₂O₃: >=97.61%；

The explosion-proof additive is explosion-proof fiber, and using polypropylene as raw material, fiber number is 10-17 danier, and length is 3.58-5.67mm；

The preparation method of the air brick, comprising the following steps:

S1, ingredient: aforementioned component and parts by weight preparation raw material are pressed；

S2, premix: it by the prepared raw material merging pre-mixing apparatus of step S1, is stirred in the case where revolving speed is 200r/min Premix is made in 25min；

S3, vibration moulding: premix made from step S2 being moved into mold, is formed at 100MPa using hydraulic press, Air brick green compact are made；

S4, curing in the mold: air brick green compact made from step S3 are placed at 35 DEG C, and band mold conserves 8h；

S5, demoulding: it after the completion of step S4 band mold maintenance, demoulds at normal temperature, air brick green body is made；

S6, maintenance: air brick green body made from step S5 is placed at 30 DEG C and conserves 30h；

S7, baking: the air brick green body after the completion of step S6 maintenance is placed at 400 DEG C and is toasted 5 days, is made after the completion of baking Obtain air brick finished product.

Embodiment 2

A kind of air brick, as unit of parts by weight, including following raw material: particle radius is the magnesium olive of 1.62-2.06mm The magnesium olive that 16 parts of forsterite sand that 36 parts of stone sand, particle radius are 1.08-1.62mm, particle radius are 0.94-1.08mm The fused magnesite 8 that 14 parts of fused magnesite that 22 parts of stone sand, particle radius are 1.34-1.76mm, particle radius are 0.92-1.34mm Part, particle radius be 0.81-0.92mm 10 parts of fused magnesite, particle radius be 1.56-1.96mm 15 parts of corundum, particle half 4 parts of sodium metasilicate that 6 parts of the corundum that diameter is 1.35-1.56mm, 6 parts of magnesium silicate cement, particle radius are 1.23-3.07nm, Gao Meng 6 parts of sour sodium, 0.4 part of explosion-proof additive, polycarboxylic acids disperse 0.6 part of water-reducing agent, 13 parts of water；

Forsterite sand MgO: >=the 46.02% of three kinds of variable grain radiuses；SiO₂: 36.92-39.04%；

Fused magnesite MgO: >=the 98.25% of three kinds of variable grain radiuses；

The emergy Al of described two variable grain radiuses₂O₃: >=97.68%；

The explosion-proof additive is explosion-proof fiber, and using polypropylene as raw material, fiber number is 12-16 danier, and length is 3.35-5.86mm；

The preparation method of the air brick, comprising the following steps:

S1, ingredient: aforementioned component and parts by weight preparation raw material are pressed；

S2, premix: it by the prepared raw material merging pre-mixing apparatus of step S1, is stirred in the case where revolving speed is 300r/min Premix is made in 23min；

S3, vibration moulding: premix made from step S2 being moved into mold, is formed at 120MPa using hydraulic press, Air brick green compact are made；

S4, curing in the mold: air brick green compact made from step S3 are placed at 42 DEG C, and band mold conserves 6h；

S5, demoulding: it after the completion of step S4 band mold maintenance, demoulds at normal temperature, air brick green body is made；

S6, maintenance: air brick green body made from step S5 is placed at 31 DEG C and conserves 26h；

S7, baking: the air brick green body after the completion of step S6 maintenance is placed at 460 DEG C and is toasted 4 days, is made after the completion of baking Obtain air brick finished product.

Embodiment 3

A kind of air brick, as unit of parts by weight, including following raw material: particle radius is the magnesium olive of 1.62-1.98mm The magnesium olive that 17 parts of forsterite sand that 40 parts of stone sand, particle radius are 1.08-1.62mm, particle radius are 0.92-1.08mm The fused magnesite 8 that 15 parts of fused magnesite that 24 parts of stone sand, particle radius are 1.34-1.76mm, particle radius are 0.92-1.34mm Part, particle radius be 0.79-0.92mm 12 parts of fused magnesite, particle radius be 1.56-1.83mm 16 parts of corundum, particle half 5 parts of sodium metasilicate that 7 parts of the corundum that diameter is 1.57-1.56mm, 8 parts of magnesium silicate cement, particle radius are 1.76-3.02nm, Gao Meng 8 parts of sour sodium, 0.4 part of explosion-proof additive, polycarboxylic acids disperse 0.9 part of water-reducing agent, 15 parts of water；

Forsterite sand MgO: >=the 45.01% of three kinds of variable grain radiuses；SiO₂: 37.38-39.04%；

Fused magnesite MgO: >=the 98.25% of three kinds of variable grain radiuses；

The emergy Al of described two variable grain radiuses₂O₃: >=98.01%；

The explosion-proof additive is explosion-proof fiber, and using polypropylene as raw material, fiber number is 12-18 danier, and length is 3.71-5.63mm；

The preparation method of the air brick, comprising the following steps:

S1, ingredient: aforementioned component and parts by weight preparation raw material are pressed；

S2, premix: it by the prepared raw material merging pre-mixing apparatus of step S1, is stirred in the case where revolving speed is 300r/min Premix is made in 20min；

S3, vibration moulding: premix made from step S2 being moved into mold, is formed at 110MPa using hydraulic press, Air brick green compact are made；

S4, curing in the mold: air brick green compact made from step S3 are placed at 42 DEG C, and band mold conserves 8h；

S5, demoulding: it after the completion of step S4 band mold maintenance, demoulds at normal temperature, air brick green body is made；

S6, maintenance: air brick green body made from step S5 is placed at 32 DEG C and conserves 20h；

S7, baking: the air brick green body after the completion of step S6 maintenance is placed at 500 DEG C and is toasted 3 days, is made after the completion of baking Obtain air brick finished product.

Comparative example 1

Prepare that air brick technique is essentially identical with embodiment 2, have only unlike prepare and lack in the raw material of air brick 16 parts of forsterite sand that 36 parts of the forsterite sand that particle radius is 1.62-2.06mm, particle radius are 1.08-1.62mm, Fused magnesite 14 part, that 22 parts of the forsterite sand that particle radius is 0.94-1.08mm, particle radius are 1.34-1.76mm Grain radius be 0.92-1.34mm 8 parts of fused magnesite, particle radius be 0.81-0.92mm 10 parts of fused magnesite, particle radius 6 parts of corundum that 15 parts of corundum, particle radius for 1.56-1.96mm are 1.35-1.56mm.

Comparative example 2

Prepare that air brick technique is essentially identical with embodiment 2, have only unlike prepare and lack in the raw material of air brick 16 parts of forsterite sand that 36 parts of the forsterite sand that particle radius is 1.62-2.06mm, particle radius are 1.08-1.62mm, Particle radius is 22 parts of forsterite sand of 0.94-1.08mm.

Comparative example 3

Prepare that air brick technique is essentially identical with embodiment 2, have only unlike prepare and lack in the raw material of air brick 8 parts of fused magnesite that 14 parts of the fused magnesite that particle radius is 1.34-1.76mm, particle radius are 0.92-1.34mm, particle half Diameter is 10 parts of fused magnesite of 0.81-0.92mm.

Comparative example 4

Prepare that air brick technique is essentially identical with embodiment 2, have only unlike prepare and lack in the raw material of air brick 6 parts of corundum that 15 parts of the corundum that particle radius is 1.56-1.96mm, particle radius are 1.35-1.56mm.

Comparative example 5

Prepare that air brick technique is essentially identical with embodiment 2, have only unlike prepare and lack in the raw material of air brick Particle radius is 4 parts of sodium metasilicate of 1.23-3.07nm.

Comparative example 6

Prepare that air brick technique is essentially identical with embodiment 2, have only unlike prepare and lack in the raw material of air brick Sodium permanganate.

Comparative example 7

Using China apply for a patent document " air brick for magnesia carbon ladle and its production method (application number: 200710012906.5) " method of embodiment 4 prepares air brick, specific as follows: by 70% fused magnesite, 14% crystalline flake graphite, 8% sintering plate corundum, 4% partially stabilized zirconia, 3% antioxidant metal Al powder, 1% antioxidant CaB6 Powder, 0.5% antioxidant B4C powder be uniformly mixed, the thermosetting phenolic resin of additional 5% liquid is used as bonding agent, mixed Practice 40 minutes, until whole materials are uniformly pug；Plastic strip is installed in mold according to stomata arrangement form；It will be kneaded Pug be added in mold, formed at 200MPa using equal pressing equipment；It is heat-treated 24 hours through 200 DEG C；Utilize lathe Green body is subjected to turning by drawing size, after turning is dry, obtains ventilative tile product according to the packaging technology assembling of air brick.

Wherein the fused magnesite is MgO 96-98%, granularity < 5mm；

Wherein the sintering plate corundum is Al₂O₃99.5-99.8%, granularity < 2mm；

Wherein the partially stabilized zirconia is the stable ZrO of CaO₂93-95%, granularity < 0.088mm；

Wherein the crystalline flake graphite is C 96-98%, granularity < 0.15mm；

The wherein thermosetting phenolic resin of the bonding agent to be under room temperature be liquid, Residual carbon 45-48%.

The air brick of air brick obtained by example 1-3 and comparative example 1-7 are subjected to mechanical property, thermal shock resistance detection, The specific detection method is as follows:

1. mechanical property: according to YB/T5201 to test specimen through 110 DEG C for 24 hours, cold crushing strength after 1550 DEG C of 3h heat treatment It is detected；

2. thermal shock resistance: by sample after 1100 DEG C of heat preservation 20min, it is anti-to measure its remnants after 3 times repeatedly by air-cooled 15min Intensity is rolled over, and calculates the flexural strength conservation rate after thermal shock；With the flexural strength conservation rate (strength retention=thermal shock after thermal shock Flexural strength × 100% before flexural strength/thermal shock afterwards) evaluate the thermal shock resistance of material；

Air brick obtained by example 1-3 and the air brick of comparative example 5 are subjected to gas permeability, resistance to slag corrosion detection, tool Body detecting method is as follows:

1. gas permeability: according to YB/T5200, to test specimen, through 110 DEG C, apparent porosity is examined for 24 hours, after 1550 DEG C of 3h heat treatments It surveys；

2. resistance to slag corrosion: sample being fitted into 1#-10# crucible respectively, then granularity < 0.5mm LF furnace finishing slag is taken to be packed into The dress quantity of slag of 1#-10# crucible, each crucible is 120g, naturally cools to room after 1600 DEG C of heat preservation 4h are warming up in electric furnace Temperature then takes out sample and sample is symmetrically cut to two halves, measures depth of erosion；Its value is smaller, then resistance to slag corrosion is better.

The above testing result is as shown in the table:

As seen from the above table: (1) by the data of embodiment 1-3 and comparative example 7 as it can be seen that the mechanics of the air brick of embodiment 1-3 Performance, thermal shock resistance, gas permeability, resistance to slag corrosion are superior to the prior art；Simultaneously by the data of embodiment 1-3 as it can be seen that implementing Example 2 is optimum embodiment.

(2) by embodiment 2 and the data of comparative example 1-4 as it can be seen that forsterite sand, the electric-melting magnesium of variable grain radius sphere Sand, corundum play synergistic effect in preparing air brick, and collaboration improves the compression strength of air brick and flexural strength is kept Rate, this is: forsterite sand is basic refractory, have good high temperature resistant, anti-etch, chemical stability, high compressive strength and The advantages that flexural strength conservation rate, sand refractoriness with higher (1710 DEG C) and anti-metal oxidative attack ability, in high temperature The lower expansion of degree slowly, and is less than deformation, and the characteristics of expansion suddenly, good thermal shock, casting is not easy to produce main folder sand defect.Electricity Fused magnesia is basic refractory, has compact structure, resistance to slag is strong, good thermal shock stability, high compressive strength and flexural strength The advantages that conservation rate.Corundum is basic refractory, has volume stability good, and minimum reheating is shunk, and good thermal shock is steady The advantages that qualitative and compression strength and flexural strength conservation rate.Using the different solid forsterite sand of particle radius, electric-melting magnesium The air brick that sand, corundum ball make as main aggregate, does not add any pore creating material, utilizes the forsterite of variable grain radius Sand, fused magnesite, corundum sphere theory of close packing constitute the disperse stomata of connection, forsterite sand, fused magnesite, corundum ball Shape is different from particle made of common forsterite sand, fused magnesite, corundum are crushed, it almost close to sphere, utilizes difference The forsterite sand of particle radius spherical shape, fused magnesite, corundum improve ventilative preparing the synergistic effect in air brick, collaboration The compression strength and flexural strength conservation rate of brick.

(3) by the data of embodiment 2 and comparative example 5 as it can be seen that lacking nanoscale sodium metasilicate as the former material for preparing air brick Material, affects the raising of compression strength and flexural strength conservation rate, this is: after air brick introduces nanometer sodium metasilicate, air brick Inside forms micro- stomata for being evenly distributed, this can effectively prevent crackle in use process and continues to spread, to improve pressure resistance Degree and flexural strength conservation rate improve air brick toughness, reduce and peel off, achieve the purpose that improve service life.

(4) by the data of embodiment 2 and comparative example 6 as it can be seen that lacking sodium permanganate as the raw material for preparing air brick, shadow The raising of apparent porosity is rung, this is: sodium permanganate being added when preparing air brick, the sodium permanganate of addition can be in brickmaking process Baking in decompose, generate gas inside blank system, make rich in hole inside blank, to make the gas permeability of product into one Step improves, and improves apparent porosity.

(2) research and development of slagging agent

Embodiment 4

A kind of slagging agent, as unit of parts by weight, including following raw material: 42 parts of atlapulgite powder, 10 parts of talcum powder, slope thread 12 parts of mountain flour, 5 parts of montmorillonite powder, 55 parts of calcium lime powder, 13 parts of fluorspar powder, 7 parts of mineral wool, 1.6 parts of adhesive；

The quality index of the atlapulgite powder raw material are as follows: SiO₂: 60.52%；Al₂O₃: 17.94%；MgO:4.85%； CaO:1.79%；Granularity is 1000 mesh；

The quality index of the talcum powder raw material are as follows: SiO₂: 59.67%；MgO:29.05%；Granularity is 1300 mesh；

The quality index of the palygorskite powder raw material are as follows: SiO₂: 55.78%；MgO:25.61%；Granularity is 1100 mesh；

The quality index of the montmorillonite powder raw material are as follows: SiO₂: 63.74%；Al₂O₃: 24.61%；Granularity is 1000 mesh；

The quality index of the calcium lime powder raw material are as follows: CaO:96.5%；Granularity is 800 mesh；

The quality index of the fluorite powder raw material are as follows: CaF₂: 72.91%；Granularity is 800 mesh；

Described adhesive is tapioca；Granularity is 600 mesh；

The preparation method of the slagging agent, comprising the following steps:

(1) in parts by weight, by atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, Blender is added in mineral wool, adhesive, while adding 28 parts of water, stirs 1h at revolving speed 500r/min, and uniform sizing material is made；

(2) uniform sizing material made from step (1) is added in mold, it is 1.1cm that partial size is made after vacuum filtering shape process Particle；

(3) particle made from step (2) is sent into baking oven, dry 9h, is made slagging agent at 92 DEG C.

Product is through physical detection: fusing point is 1362 DEG C.

Slagging agent made from embodiment 4 is subjected to steel-making actual use.Dosage is 0.82kg/ tons of steel.Through observing: product is auxiliary Malleability is good, and can really connect to react with residue reduces residue fusing point and viscosity, and temperature-measuring gun can penetrate slag blanket rapid survey steel easily Coolant-temperature gage；Simultaneously using after the slagging agent, the temperature drop of covering and heat insulating agent more simple than raw steel packet, average every furnace steel is 3.4 DEG C few；Improve Slag mobility, reduces link of skimming, removes containment wall dross.It can be seen that slagging agent fusing point made from embodiment 4 is low, activity It is high.

Embodiment 5

A kind of slagging agent, as unit of parts by weight, including following raw material: 27 parts of atlapulgite powder, 7 parts of talcum powder, slope thread 10 parts of mountain flour, 4 parts of montmorillonite powder, 34 parts of calcium lime powder, 9 parts of fluorspar powder, 7 parts of mineral wool, 1 part of adhesive；

The quality index of the atlapulgite powder raw material are as follows: SiO₂: 59.16%；Al₂O₃: 18.36%；MgO:5.44%； CaO:2.09%；Granularity is 800 mesh；

The quality index of the talcum powder raw material are as follows: SiO₂: 62.01%；MgO:27.52%；Granularity is 1200 mesh；

The quality index of the palygorskite powder raw material are as follows: SiO₂: 52.68%；MgO:27.19%；Granularity is 1000 mesh；

The quality index of the montmorillonite powder raw material are as follows: SiO₂: 65.28%；Al₂O₃: 12.31%；Granularity is 1000 mesh；

The quality index of the calcium lime powder raw material are as follows: CaO:96.32%；Granularity is 600 mesh；

The quality index of the fluorite powder raw material are as follows: CaF₂: 72.36%；Granularity is 600 mesh；

Described adhesive is tapioca；Granularity is 500 mesh；

The preparation method of the slagging agent, comprising the following steps:

(1) in parts by weight, by atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, Blender is added in mineral wool, adhesive, while adding 23 parts of water, stirs 1.5h at revolving speed 300r/min, and uniform sizing material is made；

(2) uniform sizing material made from step (1) is added in mold, it is 0.8cm that partial size is made after vacuum filtering shape process Particle；

(3) particle made from step (2) is sent into baking oven, dry 10h, is made slagging agent at 82 DEG C.

Product is through physical detection: fusing point is 1397 DEG C.

Slagging agent made from embodiment 5 is subjected to steel-making actual use.Dosage is 0.95kg/ tons of steel.Through observing: product is auxiliary Malleability is good, and can really connect to react with residue reduces residue fusing point and viscosity, and temperature-measuring gun can penetrate slag blanket rapid survey steel easily Coolant-temperature gage；Simultaneously using after the slagging agent, the temperature drop of covering and heat insulating agent more simple than raw steel packet, average every furnace steel is 4.6 DEG C few；Improve Slag mobility, reduces link of skimming, removes containment wall dross.It can be seen that slagging agent fusing point made from embodiment 5 is low, activity It is high.

Embodiment 6

A kind of slagging agent, as unit of parts by weight, including following raw material: 50 parts of atlapulgite powder, 12 parts of talcum powder, slope thread 16 parts of mountain flour, 6 parts of montmorillonite powder, 64 parts of calcium lime powder, 15 parts of fluorspar powder, 8 parts of mineral wool, 2 parts of adhesive；

The quality index of the atlapulgite powder raw material are as follows: SiO₂: 62.34%；Al₂O₃: 17.24%；MgO:3.61%； CaO:1.65%；Granularity is 1000 mesh；

The quality index of the talcum powder raw material are as follows: SiO₂: 58.34%；MgO:31.36%；Granularity is 1200 mesh；

The quality index of the palygorskite powder raw material are as follows: SiO₂: 53.47%；MgO:23.98%；Granularity is 1100 mesh；

The quality index of the montmorillonite powder raw material are as follows: SiO₂: 65.28%；Al₂O₃: 12.31%；Granularity is 1000 mesh；

The quality index of the calcium lime powder raw material are as follows: CaO:97.26%；Granularity is 700 mesh；

The quality index of the fluorite powder raw material are as follows: CaF₂: 78.15%；Granularity is 800 mesh；

Described adhesive is tapioca；Granularity is 400 mesh；

The preparation method of the slagging agent, comprising the following steps:

(1) in parts by weight, by atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, Blender is added in mineral wool, adhesive, while adding 27 parts of water, stirs 1 at revolving speed 500r/min, and uniform sizing material is made；

(2) uniform sizing material made from step (1) is added in mold, it is 1.2cm that partial size is made after vacuum filtering shape process Particle；

(3) particle made from step (2) is sent into baking oven, dry 8h, is made slagging agent at 93 DEG C.

Product is through physical detection: fusing point is 1381 DEG C.

Slagging agent made from embodiment 6 is subjected to steel-making actual use.Dosage is 0.86kg/ tons of steel.Through observing: product is auxiliary Malleability is good, and can really connect to react with residue reduces residue fusing point and viscosity, and temperature-measuring gun can penetrate slag blanket rapid survey steel easily Coolant-temperature gage；Simultaneously using after the slagging agent, the temperature drop of covering and heat insulating agent more simple than raw steel packet, average every furnace steel is 4.1 DEG C few；Improve Slag mobility, reduces link of skimming, removes containment wall dross.It can be seen that slagging agent fusing point made from embodiment 6 is low, activity It is high.

(3) design preparation 18 potassium steel system of high-purity manganese and high-purity manganese 18 potassium steel technological parameter, ingredient are prepared Research

Embodiment 7

As shown in Figure 1, comprising: furnace shell 1, furnace lining 2, furnace wall layer (crucible) 3, pedestal 4, gaseous diffuser 5, air brick 6, into Tracheae 7, union 8, furnace body protection contact 9, contact holder 10, conducting wire 11, bell 12, flow regulator 13, pressure reducing valve 14, Argon bottle 15, the furnace shell 1 are wrapped in furnace lining 2, and 2 outer surface of furnace lining is provided with furnace wall layer 3, and the bottom of the furnace shell 1 is set It is equipped with pedestal 4, gaseous diffuser 5 and air brick 6 are provided with above the pedestal 4, the air brick 6 is wrapped in gaseous diffuser 5, the air inlet pipe 7 is connect with gaseous diffuser 5, and the union 8 is connected with air inlet pipe 7 and is fixed on pedestal 4, the furnace Body protects contact 9, contact holder 10, conducting wire 11 to form furnace lining protective device, and the furnace body protection contact 9 is embedded in furnace lining 2 Interior, the contact holder 10 is connected with furnace body protection contact 9 by conducting wire 11, and the bell 12 is set to refining potassium steel The top of system, the air inlet pipe 7 connect flow regulator 13, and the flow regulator 13 connects pressure reducing valve 14, the decompression Valve 14 connects argon bottle 15.

The furnace wall layer 3 is layer of composite material resistant to high temperature.

The layer of composite material resistant to high temperature is 5:3:2 by silicon carbide, aluminium oxide diamond dust and ferrosilicon material by weight It is made.

The layer of composite material resistant to high temperature is with a thickness of 0.8cm.

The air inlet pipe 7 is pressure-resistant rubber hose.

The internal diameter of the pressure-resistant rubber hose is 0.3cm.

The furnace body protection contact 9 is made of nonmagnetic steel material.

The furnace body protection contact 9 is provided with 6.

The air brick is prepared using the technique of optimum embodiment 2, specific as follows: air brick is as unit of parts by weight, packet Include following raw material: the magnesium olive that 36 parts of the forsterite sand that particle radius is 1.62-2.06mm, particle radius are 1.08-1.62mm The electric smelting that 22 parts of forsterite sand that 16 parts of olive stone sand, particle radius are 0.94-1.08mm, particle radius are 1.34-1.76mm The fused magnesite 10 that 8 parts of fused magnesite that 14 parts of magnesia, particle radius are 0.92-1.34mm, particle radius are 0.81-0.92mm Part, particle radius be 1.56-1.96mm 15 parts of corundum, particle radius be 1.35-1.56mm 6 parts of corundum, magnesium silicate cement 6 Part, particle radius subtract for 0.4 part of 6 parts of 4 parts of sodium metasilicate, sodium permanganate, the explosion-proof additive of 1.23-3.07nm, polycarboxylic acids dispersion 0.6 part of aqua, 13 parts of water；

Forsterite sand MgO: >=the 46.02% of three kinds of variable grain radiuses；SiO₂: 36.92-39.04%；

Fused magnesite MgO: >=the 98.25% of three kinds of variable grain radiuses；

The emergy Al of described two variable grain radiuses₂O₃: >=97.68%；

The explosion-proof additive is explosion-proof fiber, and using polypropylene as raw material, fiber number is 12-16 danier, and length is 3.35-5.86mm；

The preparation method of the air brick, comprising the following steps:

S1, ingredient: aforementioned component and parts by weight preparation raw material are pressed；

S2, premix: it by the prepared raw material merging pre-mixing apparatus of step S1, is stirred in the case where revolving speed is 300r/min Premix is made in 23min；

S3, vibration moulding: premix made from step S2 being moved into mold, is formed at 120MPa using hydraulic press, Air brick green compact are made；

S4, curing in the mold: air brick green compact made from step S3 are placed at 42 DEG C, and band mold conserves 6h；

S5, demoulding: it after the completion of step S4 band mold maintenance, demoulds at normal temperature, air brick green body is made；

S6, maintenance: air brick green body made from step S5 is placed at 31 DEG C and conserves 26h；

S7, baking: the air brick green body after the completion of step S6 maintenance is placed at 460 DEG C and is toasted 4 days, is made after the completion of baking Obtain air brick finished product.

The use technique simplified process for preparing 18 potassium steel system of high-purity manganese is as follows:

Knotting crucible --- manufactures and designs gaseous diffuser --- connection blowing argon gas system --- preparing material --- charging --- adjustment chemical analysis is --- calm in furnace ---, and temperature control goes out molten steel for melting.

Specific implementation method:

(1) knotting crucible: being mounted on system bottom for air brick as required, then uses furnace lining material and mold knotting earthenware Crucible, drying and sintering；

(2) gaseous diffuser is manufactured and designed according to electric induction furnace volume size, gaseous diffuser is by chromium, magnesia or corundum Refractory material is designed to optimize air-flow and have anti-metal with the molding of fluid pressure type high-temperature baking, its granularity of gaseous diffuser Penetrability；

(3) gaseous diffuser is mounted on induction furnace bottom centre, connects blowing argon gas system, blowing argon gas system is by argon gas Bottle, pressure reducing valve, flow regulator, pressure-resistant rubber hose, union, which are linked in sequence, to be formed；

(4) prepare material: by the chemical analysis requirement of cast steel water, having weighed a variety of materials of melting cast steel water, comprising: is useless Steel, high carbon ferromanganese, electrolytic manganese, chromic carbide iron, molybdenum-iron, ferronickel, copper, it is spare；

(5) feed melting: melting in ready material step by step input furnace is cast when load melting formation molten bath When molten steel covered furnace bottom 31cm, flow regulator insufflation argon gas is started to open, argon gas participates in casting molten steel mistake by air brick Journey, as melting continues, the pressure and flow of blowing argon gas increase with the increase of cast steel water, and specific control process is as follows: preceding 8-13min, the control of Argon atmospheric pressure are controlled in 6.2-6.4kg, argon flow in 16-17L/min；14-20min, blowing argon gas Pressure control is controlled in 6.5-6.7kg, argon flow in 17.1-17.3L/min；21-30min, the control of Argon atmospheric pressure exist 6.8-7kg, argon flow are controlled in 17.4-17.6L/min；When 31min starts, Xiang Zhugang water surface covers slagging agent, Additive amount is 0.86kg/t.s, i.e., 0.86 kilogram of slagging agent is added in molten steel per ton；31-52min, the control of Argon atmospheric pressure In 6.3-6.5kg, argon flow is controlled in 17.2-17.4L/min；Until furnace charge is melting down, composition in sampling analysis furnace；

(6) chemical analysis is adjusted: according to sampling analysis as a result, calculating and being added adjustment material to whole fusings；

(7) calm in furnace: power failure is calm after cast steel liquid reaches requirement temperature in furnace, continues blowing argon gas, makes cast steel liquid samming Homogeneous, impurity, gas sufficiently float, in conjunction with liquid level slagging agent；

(8) temperature control is tapped: 18 potassium steel of high-purity manganese is made in control temperature, steel tapping casting, described using spectrum analysis 18 potassium steel of high-purity manganese, based on mass percentage, including following component: 1.32% C, 20.13% Mn, 0.56% Si, 0.038% P, 0.027% S, 2.45% Cr, 1.98% Mo, 1.53% Ni, 2.06% Cu, 0.071% Al, 0.00081% O, 0.00032% H, remaining micronutrient levels are 0.73%, surplus Fe.

Using above method melting, can uniformly cast steel liquid chemical analysis and casting molten steel temperature, improve cast steel liquid metallurgy matter Amount.

Slagging agent described in step (5) is prepared using the technique of optimum embodiment 4, and specific as follows: slagging agent is with parts by weight For unit, including following raw material: 42 parts of atlapulgite powder, 10 parts of talcum powder, 12 parts of palygorskite powder, 5 parts of montmorillonite powder, quick lime 55 parts of powder, 13 parts of fluorspar powder, 7 parts of mineral wool, 1.6 parts of adhesive；

The quality index of the atlapulgite powder raw material are as follows: SiO₂: 60.52%；Al₂O₃: 17.94%；MgO:4.85%； CaO:1.79%；Granularity is 1000 mesh；

The quality index of the talcum powder raw material are as follows: SiO₂: 59.67%；MgO:29.05%；Granularity is 1300 mesh；

The quality index of the palygorskite powder raw material are as follows: SiO₂: 55.78%；MgO:25.61%；Granularity is 1100 mesh；

The quality index of the montmorillonite powder raw material are as follows: SiO₂: 63.74%；Al₂O₃: 24.61%；Granularity is 1000 mesh；

The quality index of the calcium lime powder raw material are as follows: CaO:96.5%；Granularity is 800 mesh；

The quality index of the fluorite powder raw material are as follows: CaF₂: 72.91%；Granularity is 800 mesh；

Described adhesive is tapioca；Granularity is 600 mesh；

The preparation method of the slagging agent, comprising the following steps:

(1) in parts by weight, by atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, Blender is added in mineral wool, adhesive, while adding 28 parts of water, stirs 1h at revolving speed 500r/min, and uniform sizing material is made；

(2) uniform sizing material made from step (1) is added in mold, it is 1.1cm that partial size is made after vacuum filtering shape process Particle；

(3) particle made from step (2) is sent into baking oven, dry 9h, is made slagging agent at 92 DEG C.

Comparative example 8

It is essentially identical with the 18 potassium steel technique of preparation high-purity manganese of embodiment 7, it has only the difference is that the air brick used Difference, the air brick used prepare gained for the technique of comparative example 7.

Comparative example 9

It is essentially identical with the 18 potassium steel technique of preparation high-purity manganese of embodiment 7, it has only the difference is that the slagging agent used Difference, using Chinese patent literature " a kind of Ultra-low aluminum steel refining pre-melted slag and preparation method and application method (application Number: 201310668245.7) " method of embodiment 3 prepares slagging agent.

Comparative example 10

It is essentially identical with the 18 potassium steel technique of preparation high-purity manganese of embodiment 7, it has only the difference is that step (5) charging is molten It cleans in refining without blowing argon gas.

The comprehensive mechanical performance and oxygen, hydrogen content of the potassium steel of embodiment 7, comparative example 8-10 production are detected, tied Fruit is as follows:

Note: tensile strength, yield strength, elongation percentage, ballistic work are detected using the relevant regulations of GB/T5680-2010；Oxygen, Hydrogen content is detected using spectrum analysis.

As seen from the above table: (1) by the data of embodiment 7 and comparative example 8 as it can be seen that using air brick different, it will influence high Comprehensive mechanical performance and oxygen, the hydrogen content of manganese steel, this may be that the air brick used prepares gained for the technique of comparative example 7, obtain The air brick apparent porosity arrived is too low, and blowing argon gas is caused to be not enough, and reduces the comprehensive mechanical performance of potassium steel and improves Oxygen, hydrogen content.

(2) by the data of embodiment 7 and comparative example 9 as it can be seen that using slagging agent different, it will influence the integrated machine of potassium steel Tool performance and oxygen, hydrogen content, this may be containing the ingredient that deaerating effect is good in the slagging agent of use, caused by dehydrogenation ingredient is very few.

(3) by the data of embodiment 7 and comparative example 10 as it can be seen that cleaning in charging fusion process without blowing argon gas, it will The comprehensive mechanical performance and oxygen, hydrogen content of potassium steel are influenced, this is:

Argon gas is a kind of inert gas, it is not dissolved in molten steel, also chemical reaction does not occur with the element in steel and is formed Field trash does not pollute molten steel；The air brick of argon gas through the invention is blown into molten steel, air brick keep Argon Bubble tiny and it is abundant Even dispersion, when argon gas passes through molten steel, [H] that dissolves in molten steel, [O] etc. can be spread automatically, into Argon Bubble in on bubble It rises and is excluded from molten steel, non-metallic inclusion is then adhered on inert gas, then conjugate adheres to molten floating to molten steel surface In slag agent, so that cleaning molten steel, reduces oxygen, hydrogen content, improves the comprehensive mechanical performance of potassium steel.

Claims (10)

1. a kind of production technology of slag melting agent of refining furnace of molten steel, which comprises the following steps:

(1) in parts by weight, by atlapulgite powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, mineral wool, Blender is added in adhesive, while adding 22-30 parts of water, stirs 1-1.5h at revolving speed 300-500r/min, and uniform sizing material is made；

(2) uniform sizing material made from step (1) is added in mold, it is 0.8-1.2cm that partial size is made after vacuum filtering shape process Particle；

(3) particle made from step (2) is sent into baking oven, dry 8-10h, is made slagging agent at 82-93 DEG C.

2. the production technology of slag melting agent of refining furnace of molten steel according to claim 1, which is characterized in that active in step (1) Carclazyte powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, mineral wool, adhesive are as unit of parts by weight, tool Body are as follows: 25-53 parts of atlapulgite powder, 7-13 parts of talcum powder, 10-16 parts of palygorskite powder, 4-6 parts of montmorillonite powder, calcium lime powder 32- 64 parts, 9-15 parts of fluorspar powder, 5-8 parts of mineral wool, 1-2 parts of adhesive.

3. the production technology of slag melting agent of refining furnace of molten steel according to claim 2, which is characterized in that active in step (1) Carclazyte powder, talcum powder, palygorskite powder, montmorillonite powder, calcium lime powder, fluorspar powder, mineral wool, adhesive are as unit of parts by weight, tool Body are as follows: 42 parts of atlapulgite powder, 10 parts of talcum powder, 12 parts of palygorskite powder, 5 parts of montmorillonite powder, 55 parts of calcium lime powder, fluorspar powder 13 Part, 7 parts of mineral wool, 1.6 parts of adhesive.

4. the production technology of slag melting agent of refining furnace of molten steel according to claim 2 or 3, which is characterized in that the activity is white The quality index of native powder raw material are as follows: SiO₂: 59.16-62.34%；Al₂O₃: 17.24-18.36%；MgO:3.61-5.44%； CaO:1.65-2.09%；Granularity is 800-1000 mesh.

5. the production technology of slag melting agent of refining furnace of molten steel according to claim 2 or 3, which is characterized in that the talcum powder The quality index of raw material are as follows: SiO₂: 58.34-62.01%；MgO:27.52-31.36%；Granularity is 1200-1300 mesh.

6. the production technology of slag melting agent of refining furnace of molten steel according to claim 2 or 3, which is characterized in that the palygorskite The quality index of powder raw material are as follows: SiO₂: 52.68-56.96%；MgO:23.83-27.19%；Granularity is 1000-1100 mesh.

7. the production technology of slag melting agent of refining furnace of molten steel according to claim 2 or 3, which is characterized in that the montmorillonite The quality index of powder raw material are as follows: SiO₂: 55.17-65.28%；Al₂O₃: 12.31-25.43%；Granularity is 800-1000 mesh.

8. the production technology of slag melting agent of refining furnace of molten steel according to claim 2 or 3, which is characterized in that the quick lime The quality index of powder raw material are as follows: CaO: >=96.32%；Granularity is 600-800 mesh.

9. the production technology of slag melting agent of refining furnace of molten steel according to claim 2 or 3, which is characterized in that the fluorspar powder The quality index of raw material are as follows: CaF₂: >=72.36%；Granularity is 600-800 mesh.

10. the production technology of slag melting agent of refining furnace of molten steel according to claim 2 or 3, which is characterized in that the slag Agent is applied to preparation high-purity potassium steel, comprising the following steps:

(1) knotting crucible: being mounted on system bottom for air brick as required, then uses furnace lining material and mold knotting crucible, Drying and sintering；

(2) gaseous diffuser is manufactured and designed according to electric induction furnace volume size, gaseous diffuser is by chromium, magnesia or corundum fireproof With the molding of fluid pressure type high-temperature baking, its granularity of gaseous diffuser is designed to optimize air-flow and penetrate with anti-metal material Property；

(3) gaseous diffuser is mounted on induction furnace bottom centre, connects blowing argon gas system, blowing argon gas system by argon bottle, subtract Pressure valve, flow regulator, pressure-resistant rubber hose, union, which are linked in sequence, to be formed；

(4) prepare material: by the chemical analysis requirement of cast steel water, weighing a variety of materials of melting cast steel water, it is spare；

(5) feed melting: by melting in ready material step by step input furnace, when load melting formation molten bath, i.e. and cast steel water When covering furnace bottom 30cm, flow regulator insufflation argon gas is started to open, argon gas participates in casting molten steel process by air brick, with Melting continue, the pressure and flow of blowing argon gas increases with the increase of cast steel water, and specific control process is as follows: preceding 8- 13min, the control of Argon atmospheric pressure are controlled in 6.2-6.4kg, argon flow in 16-17L/min；14-20min, Argon air pressure Power control is controlled in 6.5-6.7kg, argon flow in 17.1-17.3L/min；21-30min, the control of Argon atmospheric pressure exist 6.8-7kg, argon flow are controlled in 17.4-17.6L/min；When 31min starts, Xiang Zhugang water surface covers slagging agent, Additive amount is 0.82-0.95kg/t.s, i.e., 0.82-0.95 kilograms of slagging agent is added in molten steel per ton；31-52min, Argon Atmospheric pressure control is controlled in 6.3-6.5kg, argon flow in 17.2-17.4L/min；Until furnace charge is melting down, in sampling analysis furnace Composition；

(6) chemical analysis is adjusted: according to sampling analysis as a result, calculating and being added adjustment material to whole fusings；

(7) calm in furnace: power failure is calm after cast steel liquid reaches requirement temperature in furnace, continues blowing argon gas, makes cast steel liquid samming homogeneous, Impurity, gas sufficiently float, in conjunction with liquid level slagging agent；

(8) temperature control is tapped: high-purity potassium steel is made in control temperature, steel tapping casting.