CN104164529A - Method for producing cast iron by adopting remelting furnace blowing smelting and purification, and apparatus thereof - Google Patents
Method for producing cast iron by adopting remelting furnace blowing smelting and purification, and apparatus thereof Download PDFInfo
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Abstract
The invention relates to a method for producing cast iron by adopting remelting furnace blowing smelting and purification, and an apparatus thereof. The method comprises the following steps: 1, adding an iron-containing raw material and auxiliary materials into a remelting furnace with a blowing function in a charging proportioning stage; 2, heating and slagging in a melting stage; 3, blowing a gas to the above obtained melt and making reducing slag in a blowing purification and reduction stage; and 4, carbonizing iron or graphitizing. The method aims to effectively remove impurities in the iron-containing raw material and the auxiliary materials through a blowing purification process, or/and an oxidation and reduction chemical reaction in high temperature blowing smelting, or/and a refining furnace blowing purification process and a vacuum process, substitutes physical remelting processes which cannot remove impurities through blowing smelting in traditional cast iron remelting induction furnaces in order to eliminate the harms of low melting point elements, high melting point elements, nonmetal inclusions and gases, stabilizes the product consistence, and matches with elements required by the production of various cast irons to produce the various cast irons through addition, generation and inoculation of iron carbide and various forms of basic structures of graphite required by the cast iron.
Description
Technical field
The present invention relates to smelting iron and steel industry, specifically belong to the category of smelting purification explained hereafter cast iron.
Background technology
Within 2012, Chinese ironcasting output is about 3,500 ten thousand tons, approximately 3000 cast iron enterprises, nearly ten thousand induction furnaces.Induction furnace, from operating frequency minute main frequency furnace, intermediate frequency furnace, the high frequency furnace of electricity consumption, is divided into basic furnace and acid lined furnace with furnace lining, to divide smelting furnace, remelting furnace, holding furnace in purposes.Smelt induction furnace and refer to main oxidation and the chemical reaction of reduction and the electric furnace of air blowing removal of contamination intensification of passing through, equipment comprises top Bottom Blowing function.Remelting induction furnace refers to the main electric furnace achieving the goal by the physical process of refuse.What present Chinese cast iron industry and cast steel industry were the most frequently used is acidity, intermediate frequency, remelting induction furnace, in state-owned nearly ten thousand remelting induction furnaces.
Tradition remelting induction furnace, with the low iron-bearing material of foreign matter content, is produced cast iron by remelting and recarburization process.Conventional iron-bearing material mainly contains foundry iron, the spheroidal graphite pig iron, high-quality steel scrap etc.In order to manufacture wind power casting, nuclear power foundry goods, large section, there are the high-end foundry goods such as iron casting of low-temperature impact toughness and fatigue property requirement, also must use the lower high-purity pig iron of foreign matter content.
Sometimes in order to improve the performance of cast iron, as wear-resisting, intensity, toughness, high and low temperature etc., according to the cast iron of the different trades mark, may also need to add the higher element auxiliary materials of purity such as some noble metals and other alloying elements, as ferrosilicon, ferromanganese, ferrochrome, pure nickel, fine copper, tin slab, molybdenum-iron, ferro-boron, vanadium iron, ferrotianium, star antimony etc., generate cast alloy iron.Tradition induction furnace remelting processing is produced high trade mark cast iron, the content of non-ferro element and compound in the strict control of needs raw material, as: P, S, Mn, Ti, Si, Cr, V, Mo, Sn, Sb, Pb, Bi, Te, As, B, Al, O, N, H etc.In fusion process, impurity in the raw materials such as iron liquid and sand grains, iron rust, furnace lining, cylinder-packing, coke ash, air and body of heater is in contact with one another, collision, chemical combination, generate the inclusiones such as oxide compound, sulfide, if well do not removed, will be retained in foundry goods inside or cast(ing) surface, form slag inclusion.Although the total content of non-metallic inclusion in cast iron is very little, be about 0.01%(W), if but can make the amount of inclusions of larger particles significantly reduce, gas content significantly declines, can improve casting compactness, reduce the probability that segregation, shrinkage porosite, crackle etc. occur, as the inclusion of > 10um easily produces fatigue cracking, can make the decrease of fatigue strength 60～80% of foundry goods, totally unfavorable to bearing the foundry goods of repeated load.In fusion process, slag is self-assembling formation, does not generally use the slag of artificial interpolation, and the inclusion of floating is difficult for fully being absorbed by slag.High temperature iron liquid in fusion process easily sucks atmosphere because have slag to cover, by O in the removing iron liquid such as reductor
2, N
2, H
2after gas, easily again suck atmosphere, and easily again form inclusion.
It is basis that tradition induction furnace remelting processing be take the physical process of refuse, be difficult to remove the various impurity that generate in that iron-bearing material, auxiliary material exist and production process, be difficult to reduce quantity and the harm of low melting point element, high-melting-point element, oxidizable element, inclusion and gas.The conventional route of producing high trade mark cast iron is to select higher iron-bearing material and the auxiliary material of purity, and current traditional cast iron industry does not have more efficiently method to address the above problem.
Summary of the invention
The invention provides a kind of method that adopts remelting furnace blowing smelting and purify production cast iron, the method is suitable for the factory that produces cast iron for traditional remelting induction furnace process, on the basis that retains induction furnace equipment, transform and install additional blowing function, reduce the expense that new installation drops into, partial adjustment technique reaches blowing purification or/and cast iron is produced in redox, can relatively improve the purity of iron-bearing material and auxiliary material, expand the use range of cast iron raw material, reduce the cost of raw material, effectively remove inclusion and the gas producing in raw material and production simultaneously, improve the interpolation quantity of the trade mark and the reduction noble metal of cast iron.
The present invention also provides the equipment of implementing aforesaid method.
Technical scheme of the present invention comprises following operation:
the charging batching phase, in having the body of heater of blowing function, add iron-bearing material and auxiliary material;
-1 melting period, heat up, slag making;
blowing purification and reduction period, be blown into gas to melt, makes reducing slag;
iron carbide or greying.
The present invention is using acid remelting furnace to be only blown into N
2, CO
2, during Ar, the addition manner of auxiliary material is: in operation
and operation
in skim before add auxiliary material amount be 1.5～10%(W of iron-bearing material total amount); In operation
iron-bearing material in sneak into auxiliary material, the auxiliary material of input is auxiliary material 20～90% of the total amount that feeds intake; In operation
before the skimming of melting period, add or the auxiliary material of portion-wise addition remainder; Described in it, auxiliary material is oxide-based, the carburelant class of lime base class, manganese; Wherein silica-based class is quartz sand or/and silicon carbide, lime, fluorite, and its ratio is fluorite 0～10%(W), lime is 10～30%(W), quartz sand 40～80%(W), or with silicon carbide, replace 0～70%(W) quartz sand; Silica-based class is 1～6%(W of iron-bearing material total amount).Wherein manganese oxide-based is one or more combination in rich manganese slag, rich manganese ore, manganese monoxide, Manganse Dioxide; Adding the oxide-based of manganese is 0～1%(W of iron-bearing material total amount); Wherein carburelant class is coke grain, graphite ore, carbon dust, broken graphite electrode slab, silicon carbide; Adding carburelant class is 0.5～3 % of iron-bearing material total amount.In operation
with
after skimming, add silica-based class auxiliary material; Auxiliary material is quartz sand, lime, fluorite, and ratio is fluorite 0～10%(W), lime 20～40%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand, be 0.5～4%(W of iron-bearing material total amount); In operation
after skimming, add the oxide-based of manganese and carburelant class, making containing manganese total amount is iron-bearing material total amount 0～2%(W), making carbon containing total amount is iron-bearing material total amount 2～4%(W).
The present invention is using acid remelting furnace to be not only blown into N
2, CO
2, Ar, and be blown into O
2time, be also included in operation
-1 He
between add operation
-2 heating by O2 blowing oxidation period, the addition manner of auxiliary material is: in operation
and operation
or/and operation
the amount of adding auxiliary material before heating by O2 blowing skimming in oxidation period is 3.5～15%(W of iron-bearing material total amount); In operation
iron-bearing material in sneak into auxiliary material, the auxiliary material of input is auxiliary material 20～90% of the total amount that feeds intake; In operation
or/and operation
in skim before add or the auxiliary material of portion-wise addition remainder; Described in it, auxiliary material is oxide-based, carburelant class, iron oxide-based of silica-based class, manganese; Wherein silica-based class is quartz sand or/and silicon carbide, lime, fluorite, and its ratio is fluorite 0～10%(W), lime is 10～30%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand; Silica-based class is 2～6%(W of iron-bearing material total amount); Wherein manganese oxide-based is one or more combination in rich manganese slag, rich manganese ore, manganese monoxide, Manganse Dioxide; Adding the oxide-based of manganese is 0～1%(W of iron-bearing material total amount); Wherein carburelant class is coke grain, graphite ore, carbon dust, broken graphite electrode slab, silicon carbide; Adding carburelant class is 1～5%(W of iron-bearing material total amount); Wherein iron oxide-based is the iron rust in iron fine powder, iron ore, iron scale, iron scale, brown iron oxide, iron-bearing material; The oxide compound that adds iron is iron-bearing material total amount 0.5～3%(W).In operation
in skim after add silica-based class auxiliary material; Auxiliary material is quartz sand, lime, fluorite, and ratio is fluorite 0～10%(W), lime 20～40%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand, be 0.5～4%(W of iron-bearing material total amount); In operation
in skim after add the oxide-based of manganese and carburelant class, making containing manganese total amount is iron-bearing material total amount 0～2%(W), making carbon containing total amount is iron-bearing material total amount 2～4%(W).
Operation of the present invention
in melt is blown into oxygen or oxygen enrichment, when raw material is molten into 30%～100%, to being blown into oxygen in raw material or oxygen enrichment is fluxed, carrier of oxygen pressure is 0.2～0.8 MPa, oxygen-supplying amount is 1.5～25m
3/ t, wherein the oxygen level of oxygen enrichment is 30%～93%.
Operation of the present invention
in, the gas that melt is blown into also comprises and is blown into N
2, CO
2, in Ar one or more.Element in iron and steel scrap divide have oxidizable: Ca, Mg, S, Al, Ce, Ti, Si, B, V, Nb, Mn, Cr, P, C etc.; Dysoxidizable: Pb, Sb, As, W, Mo, Ni etc.; Substantially be not oxidized: Sn, Co, Cu etc.[O] that the oxygen that the present invention enters by top bottom blowing and the oxide compound of iron discharge, height [O] atmosphere forming, fully be oxidized oxidizable impurity, FeO is generating a large amount of CO gas with the reacting of C, CO and other gases that are blown into carry the impurity of easy fusing, volatilization and oxidation in the process of floating, sneak into slag and discharge.The N that the gases such as CO that produce during the present invention smelts and bottom are blown into
2, the gas such as Ar can effectively float and carry impurity, to non-metallic inclusion, gas, lower boiling and low melting point, there is extremely strong cleansing power, as all low in the boiling point of the elements such as Hg, Cd, Zn, Sb, As, Bi and compound, easily form steam condition and be eliminated.The high-temperature stirring such as air blowing stirring, are also conducive to the decomposition of impurity in high-melting-point element and raw material, as the ash in Mo, Co, W, bulk graphite, carburelant grades.
Operation of the present invention
in body of heater is blown into the mode of gas, for inserting gas blow pipe or/and install blowing function additional in bottom in remelting furnace; Or/and in ladle by inserting gas blow pipe or/and install blowing function additional in bottom; Gas blow pipe can adopt water-cooled copper, common steel tube, high temperature coating aluminized steel tube, hot metal pipe, vitrified pipe, metal ceramic tube from top, fire door, sidepiece be blown into gas, high temperature coating aluminized steel tube, hot metal pipe, vitrified pipe, metal ceramic tube can contact steel water.When the present invention adds reducing slag, by Bottom Blowing or top blast gas, can be at electric arc furnace or/and refining furnace, or/and extracting vacuum is simultaneously blown into N
2, CO
2, Ar, can first blow N
2, blow CO again
2or Ar, also can only blow CO
2or Ar, remove inclusion and gas, be specially 0.05～1.0m
3/ min, 5～20 min.Use water-ring pump and vapor jet pump or use separately water-ring pump extracting vacuum, and being blown into gas, after reaching vacuum tightness 10～300Pa, 5～20min bleeds.For producing high trade mark cast iron, require foreign matter content very low, can extend gassing time, extracting vacuum, improves refining effect simultaneously, is conducive to improve the removing effect of inclusion, gas, low melting point, and prevents that gas secondary from sneaking into.
In cast iron, there are a large amount of tiny non-iron, carbonaceous points, SiO
2, FeO, MnO, Al
2o
3deng oxide fine particle, be about 5,000,000/cm
3, size is between 0.2～1.0 μ m, and MnS, FeS sulfides particulate are about 4,000 ten thousand/cm
3, size is between 2～23 μ m.The amount of inclusions of size below 10 μ m is about 90%, under general nature state, the inclusion of > 50um can initiatively float, Bottom Blowing technique can make the inclusion floating of > 5um rapidly, but also has some effects for the heterogeneous nucleation quantity of < 1um.If in cast iron because air void causes density decline 0.2T/ m
3, mean that the perviousness of cast iron gas is equivalent to approximately improve 37%.Every oxidation 1%(W) CO that C generates, or the every reduction of C 6%(W) the CO that generates of FeO, because gas density is little, after expanded by heating, its volume is approximately nearly thousand times of total iron and steel liquid.N
2, CO, CO
2, Ar gas etc. is dissolved in iron and steel hardly, the ultra-large volume ratio between the gas in purification process and iron and steel liquid, is the major cause that effectively floats carrying clamp foreign material, obnoxious flavour and clean low-boiling point material etc., significant to improving cast iron quality.
Operation of the present invention
in, can be to body of heater extracting vacuum.At reduction period, to use water-ring pump and vapor jet pump or use separately water-ring pump, extracting vacuum auxiliary furnace bottom blowing enter gas, after reaching vacuum tightness 10～300Pa, 5～the 20min that bleeds, reduces the content of gas and inclusion, further removes obnoxious flavour, inclusion and volatile substances.
The electric furnace of remelting mode of the present invention is any in electric arc furnace, induction furnace, plasma heating furnace, electron beam furnace; The furnace lining of body of heater is acid.
Body of heater of the present invention, the purposes of body of heater can be remelting furnace, holding furnace, electric furnace can addition of vacuum de-gassing vessel; Electric arc furnace can be three-phase stove and Once-through Boiler; Induction furnace can be main frequency furnace, intermediate frequency furnace or high frequency furnace; Electric furnace can use separately a kind of and multiple use of combining.
Equipment of the present invention is that remelting furnace bottom of furnace body has opening; Gas blow pipe setting corresponding to bottom of furnace body opening, is filled with the gas permeable brick of isolating melt in the opening of remelting furnace bottom of furnace body; Gas blow pipe has cooling water circulation securing system outward.
Iron-bearing material of the present invention comprises one or more the combination in the oxide compound of steel water, iron and steel scrap, conversion pig, foundry iron, the spheroidal graphite pig iron, reduced iron, half steel, iron; That iron and steel scrap comprises is heavily useless, in useless, system is useless, light useless, burn one or more the combination in scrap iron, steel scrap, scrap iron, motor iron, shock wave iron, iron and steel bits, parts scrap iron, iron and steel foundry returns, high-meltiing alloy iron and steel scrap, plating iron and steel scrap, automobile waste iron and steel, high-quality iron and steel scrap or low-quality iron and steel scrap.
Auxiliary material of the present invention divides slag making auxiliary material, element auxiliary material; slag making auxiliary material is mainly for generation of slag; slag making auxiliary material object is to provide oxidation and reduction atmosphere; absorption impurity, accelerates the fusing of iron-bearing material, adjusts the required acid base concentration of melting; protection furnace lining; reduce heat radiation and air-breathing, fusing heat is provided, slag will have the ability of good mobility, viscosity and absorption impurity.
Acid lined furnace is used silica-based class slag making auxiliary material, and auxiliary have quartz sand (silicon carbide), lime, clay, alumina, a fluorite etc., and they lose less in redox reaction, wherein CaO, SiO
2be mainly used in adjusting the potential of hydrogen of slag, CaF
2be mainly used in strengthening the mobility of alkaline slag making, Al
2o
3the main viscosity that increases alkaline slag making.Minute for the oxidation sludge of oxidizing reaction and for the reducing slag of reduction reaction.The oxide compound of iron is slag making auxiliary material, is again iron-bearing material, very large to reduction period fluctuation in melting period.Carburelant, silicon carbide are element auxiliary material, can be decomposed into C, Si element, also can generate CO, SiO
2heating.Element auxiliary material is according to the ratio of the required alloying element of trade mark of casting iron, before reduction period or in reduction period, adjust, as carbon, silicon, manganese, can be by adding the adjustment such as coke, carbon dust, silicon carbide, rich manganese slag, rich manganese ore, ferrosilicon, ferromanganese, the element auxiliary material foreign matter content adding before reduction period can be higher, and the element auxiliary material adding at reduction period needs foreign matter content lower.
SiO in acid lined furnace
2/ CaO represents the size of acidity, and high acidity is conducive to protect furnace lining, high SiO
2the slag of content, easily causes SiO
2be reduced to the atmosphere of element silicon, reduce the consumption of reduction period ferrosilicon or silicon carbide.In charging period to oxidation early stage, can supplement the deficiency of silicone content in iron-bearing material, can replace part quartz sand with silicon carbide, although element silicon in a large amount of scaling loss oxidation period, but SiO
2after ratio strengthens, element silicon residual quantity obviously increases, and element silicon can reduce the scaling loss of carbon simultaneously, increases the heat of melting period and oxidation period, and the thermal discharge of the Oxidation of SiC of unit mass is approximately (the generating CO) 2.5 times of carbon.
For containing the very low iron-bearing material of manganese, in charging period, to oxidation, add the oxide compound of manganese early stage, be conducive to reduce slag melting.In oxidizing reaction, the loss of manganese element is very large, increases the content of the oxide compound of manganese in slag, can reduce the oxidation of manganese in iron-bearing material, adds the oxide compound of manganese in oxidation latter stage, can increase possibility of " Hui Meng ", the consumption of minimizing reduction period ferromanganese.Furnace temperature is high, and FeO is few, and basicity is high, and time manganese degree is high.
FeO is a value constantly changing in redox reaction, first be present in the iron rust of iron-bearing material, manually add afterwards the fusing point of the adjustment slags such as part iron scale, add iron ore etc. to emit oxygen, by oxygen blast, improve the quantity of FeO, oxidation atmosphere is provided, indirectly pass [O], fully oxidation impurities wherein the most important thing is to impel the oxidation of phosphorus, with the same also oxidable other impurity of acid lined furnace in basic furnace.FeO is finally reduced by C, produces CO gas, and floating is cleaned impurity, and carbon also can constantly reduce the quantity of FeO in oxidation atmosphere simultaneously, and while tapping a blast furnace, the content of FeO can drop to 0.05～0.5%(W containing ferro element).If the impurity of need oxidation in iron and steel scrap, volatilize, dissolve, discharging is less, can reduce the amount of being blown into of oxygen enrichment, the output of CO gas is reduced, accelerate the speed of intensification, reduce energy loss.
Pre-estimate the ratio of the carbon of iron-bearing material, infer the interpolation quantity of carbon in batching, reduce the consumption of reduction period carburelant, the object of adding carbon is the high carbon containing requirement that reaches cast iron, be different from steel-making decarburization and reach the low carbon containing requirement of steel, and be conducive to produce heat, improve melting speed, reduce melt temperature of fusion, reduction FeO, generates CO, supplements the carbon content deficiency of using steel scrap to cause, silicon carbide can supplement carbon and silicon, also can produce heat.
By desulfurization, dephosphorization technology, can effectively remove S, P.General dephosphorization is more difficult than desulfurization, also can desulfurization in the time of dephosphorization under reducing atmosphere.Blast furnace, cupola furnace, remelting electric furnace, acid electric furnace dephosphorization difficulty are large, general dephosphorization not, a desulfurization.
Desulfurization is thermo-negative reaction, mainly by CaO base slag, and minute high and low oxygen atmosphere desulfurization.In the oxidation period of alkalescence and acid electric furnace, under oxygen blast, high oxidation iron, low alkali atmosphere, a small amount of sulphur easily generates SO2 gas, with furnace gas, discharge, make to reduce to 0.9～0.6 containing S total amount, in reduction period, wash heat and the refining furnace of electric furnace, at hypoxemia and suboxide, when furnace temperature is higher, basicity is higher or carbon content is higher, S easily forms sulfide slag and discharges.Or/and divide the desulfurization of stove reduction method, phosphorus sulphur in wash heat and refining furnace.
Produce low phosphorus pig iron and can use low-phosphorous iron-bearing material, for adopting iron and steel scrap ironmaking, in grey cast iron product containing P total amount often than high in steel, the P total amount Chang Yugang that contains of wriggling in China ink, spheroidal graphite cast iron product approaches, if need a small amount of dephosphorization, can, by electric furnace, wash heat, refining furnace by a small amount of dephosphorization of reduction method, make to reduce to 0.8～0.4 containing P total amount.
By dephosphorization under reducing atmosphere in deslagging process and refining furnace, can reduce the content of oxygen in cast iron, sulphur, inclusion simultaneously.During iron and steel liquid C content >=1% (W), easily make oxygen level≤50ppm, then by blowing argon gas and strong reductor deoxidation, when oxygen level≤10ppm, easy dephosphorization.In electric furnace or refining furnace, add CaAl, CaSi, CaC
2deng after, first calcium react with sulphur, oxygen, and slag liquid interface oxygen gesture is further reduced, and is less than Critical oxygen potential, the almost simultaneously reaction such as phosphorus, carbon, nitrogen of calcium generates calcium phosphate etc.Calcium phosphate easily generates poisonous substance, need deal carefully with.Deslagging process dephosphorization, general first useization slag hearth melting furnace slag, rear pulverization process, pours ladle into iron and steel liquid, also can when electrosmelting terminal, add slag charge, after fusing and molten steel pour ladle into simultaneously, during change slag, also can add other alloys.Normal principal constituent (the CaO+BaO)-Al2O that uses
3-CaF
2slag system, wherein CaO regulates basicity, desulfurization, dephosphorization, Al2O3 and SiO
2adjust viscosity, MgO protects furnace lining, CaF
2fusing assistant, Al deoxidation, heating, C, SiC, CaC
2deoxidation, heating, foaming.
The present invention is intended to by blowing purification technique, or/and the chemical reaction of the oxidation in high temperature blowing smelting and reduction, or/and select refining furnace blowing purification technique, vacuum technology etc., effectively remove the impurity in iron-bearing material and auxiliary material, substitute in traditional cast iron remelting induction furnace cannot blowing smelting removal of contamination physics reflow process.The present invention can, for the production of low-grade foundry goods, also can produce high-grade foundry goods.The present invention can produce ash mouth, the China ink of wriggling, spheroidal graphite, malleable, white cast iron, heat-resisting, anti-corrosion, antifriction cast iron, synthetic, inoculated cast iron, the products such as D type cast iron.
Compared with prior art, the invention has the advantages that: utilize the N being blown into
2, CO
2, Ar, eliminate obnoxious flavour, floating is carried impurity, utilize and be blown into O
2, oxidation atmosphere is provided, for oxidation impurities, in oxidation and reduction process, generate a large amount of CO gas floatings and carry impurity.By blowing purification, blow stirring, redox chemical reaction, the mode such as vacuumize, eliminate the various impurity that produce in iron-bearing material, auxiliary material and production, eliminate the harm of low melting point element, high-melting-point element, non-metallic inclusion and gas, the consistence of stable prod, coupling is produced the required element of various cast iron, the iron carbide that interpolation, generation, inoculated cast iron are required or the foundation structure of various forms of graphite, reach the object of the various cast irons of production.
Air blowing technique has certain volatilization effect to excess low melting point element, as: Hg, Cd, Zn, Mg, Ce, Al, Cu, Sn, As, Sb, Bi, Pb etc.Can improve the decomposition efficiency of high-melting-point element, as: Ni, Co, Ti, Cr, V, B, Nb, Mo, W etc., reduce mechanical workout hard spot.Also can reduce the content of oxidizable element, as Ca, Mg, S, Al, Ce, Ti, B, Si, V, Nb, Mn, Cr etc.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
.
Embodiment
In Fig. 1, for to traditional remelting furnace transformation, make it have the scheme of blowing function.At bottom of furnace body 1 opening, imbed the gas permeable brick 3 of gas blow pipe 2 and isolation melt, lay cooling water circulation securing system 4, make body of heater have Bottom Blowing function.
embodiment 1:acid induction furnace oxidation style air blowing technique
In induction furnace, adopt vitrified pipe, metal ceramic tube, hot metal pipe; from top or fire door insertion steel water, be blown into gas; also can be at bottom opening; imbed the gas permeable brick of gas blow pipe and isolation melt; lay cooling water circulation protection scavenger system, make traditional remelting induction furnace have Bottom Blowing function.By top Bottom Blowing or top blast gas, be blown into oxygen, the element that oxidized portion is oxidizable, and utilize the oxide compound of the artificial iron adding and the FeO that oxygen blast generates, and abundant oxidation impurities, FeO is produced CO gas by C reduction, a large amount of floating cleaning impurity.Utilize bottom or top blast gas, be blown into N
2, CO
2, Ar, eliminate obnoxious flavour, part floating is carried impurity.The various impurity that generate in that iron-bearing material in traditional remelting processing, auxiliary material exist and production process can be reduced, quantity and the harm of low melting point element, high-melting-point element, oxidizable element, inclusion and gas can be fallen.Improve the trade mark of cast iron and reduce the interpolation quantity of noble metal, also can in later process, by refining furnace and vacuum refining furnace, further reduce impurity, prevent that gas secondary from sneaking into.
fettling
Each smelting after one heat steel iron liquid, checks furnace lining immediately, and the position such as Rapid-Repair furnace bottom and slag line at high temperature, to safeguard burner hearth original state.First furnace bottom residue is all clawed, with silica sand, the washed-out sand compound fettling of 1:1, every refining 30 stove left and right, corrode furnace bottom with lime, then again repair, and adopt the roasting method baking of fire.
charging batching
Object: rationally pile up iron-bearing material, pre-estimate iron-bearing material and need to generate carbon in cast iron kind, silicon, manganese equal proportion, rationally add auxiliary material.
Iron-bearing material is packed into induction furnace.Furnace bottom is put half pig iron small powder, and material, low-carbon waste steel are amplified in stove middle part, and aniseed surrounding is put middle material, with small powder, tamps top always, and raw material dress is real.If the small powder ratio such as thread or tabular is more, can adopt hydraulic way compression small powder, make the small powder < 50% that disperses, it is 5～200Kg that briquetting nearly weighs.As the use molten iron of having ready conditions, can be after completing part solid iron and steel, the steel water of casting 30～100%.In oxidation period, add in addition 0～10%(W that solid iron-bearing material is above-mentioned total amount), inhibited oxidation heat-up rate, is convenient to removal of contamination at lower temperature.
In charging batching phase and preliminary melting period or/and to add the amount of auxiliary material before the skimming of heating by O2 blowing oxidation period be 3.5～15%(W of iron-bearing material total amount); In the iron-bearing material of charging batching phase, sneak into auxiliary material, the auxiliary material of input is auxiliary material 20～50% of the total amount that feeds intake, and above-mentioned auxiliary material is mixed, and part is auxiliary at furnace bottom, can reduce the consumption of carbon, the quantity of increase carbon atom; In preliminary melting period or/and add before the skimming of heating by O2 blowing oxidation period or the auxiliary material of portion-wise addition remainder; Described in it, auxiliary material is oxide-based, carburelant class, manganese oxide-based of lime base class, iron;
Wherein silica-based class is quartz sand or/and silicon carbide, lime, fluorite, and its ratio is fluorite 0～10%(W), lime is 10～30%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand; Silica-based class is 2～6%(W of iron-bearing material total amount).In oxidation period, make SiO
2the ratio of/CaO is about 1.5～5, the deficiency of supplementing element silicon in iron-bearing material with silicon carbide or quartz sand.
Wherein manganese oxide-based is one or more combination in rich manganese slag, rich manganese ore, manganese monoxide, Manganse Dioxide; Adding the oxide-based of manganese is 0～1%(W of iron-bearing material total amount);
Wherein carburelant class is coke grain, graphite ore, carbon dust, broken graphite electrode slab, silicon carbide; Adding carburelant class is 1～5%(W of iron-bearing material total amount);
Wherein iron oxide-based is the iron rust in iron fine powder, iron ore, iron scale, iron scale, brown iron oxide, iron-bearing material; The oxide compound that adds iron is iron-bearing material total amount 0.5～3%(W).
Skimming after removal of contamination of heating by O2 blowing oxidation period, need separately make a small amount of new oxidation sludge and cover melt, or skim after the removal of impurity at blowing purification and reduction period, also need separately to make a small amount of new reducing slag and cover melt, new slag is silica-based class auxiliary material, mainly quartz sand, lime, fluorite, consists of, and ratio is fluorite 0～10%(W), lime 20～40%(W), quartz sand 40～80%(W), or replace 20～70%(W with silicon carbide) quartz sand, be 0.5～4%(W of iron-bearing material total amount); SiO in slag
2the ratio of/CaO is about 1.2～3;
After the skimming of heating by O2 blowing oxidation period, add the oxide-based of manganese and carburelant class, making containing manganese total amount is iron-bearing material total amount 0～2%(W), making carbon containing total amount is iron-bearing material total amount 2～4%(W).At reduction period, according to the ratio of non-ferro element in trade mark of casting iron, add in time element auxiliary material, adjust alloying constituent.
preliminary melting period
Peak power heating raw, heats up part solid cast iron raw material to be fused into steel water rapidly.
heating by O2 blowing oxidation period
object:the fusing of acceleration raw material, persistently overheating, oxygen blast is fluxed, and forms high oxidation atmosphere, oxidation impurities, gas stirring molten bath, floating inclusion, analytical element content, skims, and removes impurity and gas.
the fusing of acceleration raw material:peak power heating, oxygen blast is fluxed, and accelerates raw material fusing, mends slag, sampling analysis element.
Raw material fusing 50～80%(W) time, use oxygen or oxygen enrichment to flux, by top Bottom Blowing or top blast gas, be blown into oxygen, blow gas pressure is 0.1～0.6MPa, and oxygen enrichment oxygen level is 50～93%, and blowing oxygen quantity is 2～20 Nm
3/ T, making FeO maximum level in oxidation period is 1.5～12%(W of iron-bearing material total amount), account for the 10～50%(W that is oxidized slag total amount in latter stage), to go deimpurity degree to select blowing oxygen quantity, iron-bearing material impurity is higher or produce the cast iron of the high trade mark, need to be blown into more oxygen.
When furnace charge fusing reaches 70～100%, supplement slag making auxiliary material, fully stir molten steel, in molten bath sampling core, analyze C, P, S equal size, according to the control requirement to the content of P, S, determine the scheme of a small amount of dephosphorization of deslagging process, desulfurization, reduction period desulfurization program, tentatively determines that reduction period adds the scheme of alloying element content.Before skimming oxidation period, supplement the quantity of slag, adjust acidity etc., carry out the preparation of skimming.After raw material fine melt, should suitably reduce output power, mainly rely on heating by O2 blowing.
Adopt water cooled oxygen lance or oxygen blow steel pipe, insert slag degree of depth < 100mm, angle is 30～45 °.Adopt the oxygen rifle of hyperthermal material also can insert in steel water, can improve oxidation rate, reduce the loss of oxygen.Do not use while fluxing, raw material is drawn in to molten bath with hook, improve burn-off rate.
slag making decon:if need more pure iron liquid, impurity to first C oxidation in oxidation order, oxidation impurities at lower temperature, portion-wise addition iron-bearing material, extends duration of blast, adopt stream slag and the mode of skimming automatically, take off in time oxidation sludge in batches, add and make new oxidation sludge, removal of contamination needs to prevent that furnace temperature from rising too fast simultaneously, oxidation atmosphere declines, and impurity reduces again.Can remove the elements such as Ti, B, V, Mn, Nb, Cr.
the formation of high temperature oxidation atmosphere:to bath lancing, because of the very high concentrations of Fe in melt, part 2Fe+O
2=2FeO, being oxidized main is indirect biography oxygen by FeO, FeO+M=MO; Small part passes oxygen, FeO=Fe+[O by the FeO on interface to diffusion in iron and steel liquid], and oxygen diffusion is in iron and steel liquid, O
2=2[O]; Also there is a small amount of direct oxidation, 2M+O
2=2MO; Be deposited in the unfused iron ore of furnace bottom and also can provide oxygen, FeO=Fe+[O], Fe
2o
3=2FeO+[O], be thermo-negative reaction, speed of response is come slowly than oxygen blast thermopositive reaction.The oxidation that oxidation atmosphere is impurity element provides condition, is that electric furnace technique is gone deimpurity important step.
oxidation order:under smelting condition, the fundamental order of part elemental oxygen is 1400 ℃ of Ca → Mg → a small amount of Fe → a small amount of S → Al → Ce → Ti → B → Si → V → Nb → Mn(Nb, Mn >, easily by C, reduced) → Cr → P → C → Fe, Sn → Mo → W → Ni → Pb → Sb → As → Co → Cu etc.Wherein Sn, Sb, As, Pb partly volatilize and are oxidized, and W, Mo, Ni are oxidized on a small quantity, and Co, Cu are not oxidized substantially.Oxidation order is also relevant with concentration, and concentration is high, easily oxidized.
generate SO 2 :oxidation period oxygen more active than sulphur, under oxygen blast, high oxidation iron, low alkali atmosphere, a small amount of sulphur easily generates SO2 gas, discharges FeS+2[O with furnace gas]=Fe+SO
2↑, MnS+2[O]=Mn+SO
2↑.
the preliminary deoxidation of skimming has a power failure:when skimming removal of contamination oxidation period, furnace temperature is progressively raising, progressively enter and be oxidized latter stage, should suitably reduce output power, stop after oxygen blast, at liquid level, sprinkle carburelant, making carbon containing total amount is iron-bearing material total amount 2～4%(W), supplement the carbon content of molten iron, according to the requirement of manganese content in trade mark of casting iron, the appropriate oxide compound that adds manganese, for iron-bearing material total amount 0～2%(W), allow molten bath enter approximately 3～15min of nature boiling state, make FeO be converted in a large number Fe, the oxide compound of manganese is reduced by carbon, supplement the content of manganese in molten iron, take off oxidation sludge, impurity in the oxide compound of removing carburelant and manganese, make thin reducing slag and cover melt, to reduce air-breathing and cooling.Fully stir molten steel, in molten bath sampling core, analyze the constituent contents such as C, Mn, Si, S, P, for the later stage is timely, adjust constituent content foundation is provided.Acid electric furnace cannot dephosphorization, generally not desulfurization, and other are similar to basic furnace.
Furnace temperature is at 1450～1670 ℃, and the oxidizing reaction of C progressively enters very active state, FeO+C=Fe+CO, C+[O]=CO, FeO is fully reacted with C, C consumes in a large number, generates CO, the floating of CO and the N in oxygen enrichment
2stir, gas carrying clamp foreign material are fully floated, be conducive to discharge inclusion and gas.
Also can adopt gas injection carburetting, carburelant can be used silicon carbide, coke granule etc., adds reducing slag and covers melt.Every reduction 6%(W) FeO, the 1%(W needing) C, the oxidation rate of C is about 0.3～1.2%/h.
blowing purification and reduction period
Skimming oxidation period is completely called reduction period during this period of time to the liquid that taps a blast furnace, and acid induction furnace reduction period, mainly to the deoxidation of iron liquid, continues to discharge inclusion and gas by air blowing, prevents that gas secondary from sneaking into, and adjusts alloy element component, controls tapping temperature well.Reduction period can be at induction furnace or/and complete in refining furnace and deslagging process, or/and extracting vacuum simultaneously.General not in the reduction period desulfurization of acid electric arc furnace, and by a small amount of dephosphorization of deslagging process time during a small amount of desulfurization, and to make slag be temporarily alkalescence.If need to be in deslagging process, refining furnace and vacuum oven further removal of contamination and gas, need to select higher tapping temperature.
Add reductive agent, close fire door, guarantee to react and proceed, guarantee that burner hearth has good stopping property, to keep white slag to form fast as far as possible.Conventional reductive agent has carbon dust, silicon carbide, ferrosilicon, ferromanganese, ferro-silico-manganese, aluminium etc.
Simultaneously by Bottom Blowing or top blast gas, can induction furnace or and refining furnace, or/and extracting vacuum is simultaneously blown into N
2, CO
2, Ar, can first blow N
2, blow CO again
2or Ar, also can only blow CO
2or Ar, remove inclusion and gas, be specially 0.05～1.0m
3/ min, 5～20 min, removing inclusion and obnoxious flavour that can be good, air blowing can be carried out at electric arc furnace or with refining furnace, for producing high trade mark cast iron, requires foreign matter content very low, can extend gassing time, extracting vacuum, with induction furnace+vacuum mode, refining furnace+vacuum mode, improves refining effect simultaneously, be conducive to improve the removing effect of inclusion, gas, low melting point, and prevent that gas secondary from sneaking into.Use water-ring pump and vapor jet pump or use separately water-ring pump extracting vacuum, and auxiliary furnace bottom blowing enters gas, after reaching vacuum tightness 10～300Pa, 5～20min bleeds, reduce the content of gas and inclusion, further remove obnoxious flavour, inclusion and volatile substances.
According to the ratio of non-ferro element in trade mark of casting iron, add in time element auxiliary material, adjust alloying constituent, iron liquid temp is elevated to tapping temperature, tapping temperature scope is 1320 ℃～1650 ℃, carries out the preparation of tapping a blast furnace.
Produce low phosphorus pig iron and can use low-phosphorous iron-bearing material, for adopting iron and steel scrap ironmaking, in grey cast iron product containing P total amount often than high in steel, the P total amount Chang Yugang that contains of wriggling in China ink, spheroidal graphite cast iron product approaches, if need a small amount of dephosphorization, can pass through a small amount of dephosphorization of reduction method by wash heat or refining furnace, make to reduce to 0.4～0.8 containing P total amount.
By dephosphorization under reducing atmosphere in deslagging process and refining furnace, can reduce the content of oxygen in cast iron, sulphur, inclusion simultaneously.During iron and steel liquid C content >=1% (W), easily make oxygen level≤50ppm, then by blowing argon gas and strong reductor deoxidation, when oxygen level≤10ppm, easy dephosphorization.In electric furnace or refining furnace, add CaAl, CaSi, CaC
2deng after, first calcium react with sulphur, oxygen, and slag liquid interface oxygen gesture is further reduced, and is less than Critical oxygen potential, calcium almost reacts with phosphorus, carbon, nitrogen etc. simultaneously, generates calcium phosphate etc.Calcium phosphate easily generates poisonous substance, need deal carefully with.Deslagging process dephosphorization, general first useization slag hearth melting furnace slag, rear pulverization process, pours ladle into iron and steel liquid, also can when electrosmelting terminal, add slag charge, after fusing and molten steel pour ladle into simultaneously, during change slag, also can add other alloys.Normal principal constituent (the CaO+BaO)-Al that uses
2o
3-CaF
2slag system, wherein CaO regulates basicity, desulfurization, dephosphorization, Al
2o
3with SiO
2reduce viscosity, MgO protects furnace lining, CaF
2fusing assistant, Al deoxidation, heating, C, SiC, CaC
2deoxidation, heating, foaming.
iron carbide or greying
Iron carbide refers to that carbon exists with atomic way in molten iron, and after solidifying, with the form appearance of iron carbide, greying refers to that carbon independently exists in crystal mode at molten iron and after solidifying.Iron carbide or greying can be at induction furnace or/and complete in refining furnace, or/and keep vacuum state, prevent that secondary air from sneaking into.For producing white cast iron, can select higher tapping temperature, by air blowing, stir and fully decompose the graphite crystallization body in molten iron, carbon is dissolved in iron liquid with atomic condition.For producing spheroidal graphite and vermicular cast iron, should select higher tapping temperature, grey cast iron should be selected lower tapping temperature, tapping temperature more in high de-agglomeration iron liquid the effect of graphite better, eliminate as far as possible the hereditary defect of graphite, then add the pig iron of some amount or less graphite crystal and graphite nucleating agent, at lower temperature, breed graphite.
embodiment 2:acid induction furnace is not oxidized air blowing technique
Be not blown into oxygen and do not add the oxide compound of iron, other are identical with oxidation air blowing technique, and the effect of removal of contamination is lower than oxidation air blowing technique.
1) fettling
With embodiment 1.
2) charging batching
Iron-bearing material is packed into induction furnace, with embodiment 1.In the amount of adding auxiliary material before the skimming of charging batching phase and melting period, be 1.5～10%(W of iron-bearing material total amount); In the iron-bearing material of charging batching phase, sneak into auxiliary material, the auxiliary material of input is auxiliary material 20～50% of the total amount that feeds intake; Before the skimming of melting period, add or the auxiliary material of portion-wise addition remainder.Described in it, auxiliary material is oxide-based, the carburelant class of lime base class, manganese;
Wherein silica-based class is quartz sand or/and silicon carbide, lime, fluorite, and its ratio is fluorite 0～10%(W), lime is 10～30%(W), quartz sand 40～80%(W), or with silicon carbide, replace 0～70%(W) quartz sand; Silica-based class is 1～6%(W of iron-bearing material total amount), in fusing, make SiO latter stage
2the ratio of/CaO is about 1.5～5.
Wherein manganese oxide-based is one or more combination in rich manganese slag, rich manganese ore, manganese monoxide, Manganse Dioxide; Adding the oxide-based of manganese is 0～1%(W of iron-bearing material total amount);
Wherein carburelant class is coke grain, graphite ore, carbon dust, broken graphite electrode slab, silicon carbide; Adding carburelant class is 0.5～3 % of iron-bearing material total amount.
After skimming in melting period, add silica-based class auxiliary material; Auxiliary material is quartz sand, lime, fluorite, and ratio is fluorite 0～10%(W), lime 20～40%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand, be 0.5～4%(W of iron-bearing material total amount), SiO
2the ratio of/CaO is about 1.5～10; After the skimming of melting period, add the oxide-based of manganese and carburelant class, making containing manganese total amount is iron-bearing material total amount 0～2%(W), making carbon containing total amount is iron-bearing material total amount 2～4%(W).
3) melting period
Use peak power melt raw material, rapidly solid cast iron raw material is heated up and is fused into steel water.Continue to add or portion-wise addition auxiliary material, fully stir molten steel, in molten bath sampling core, analyze C, P, S equal size, for the later stage is timely, adjust constituent content foundation is provided.
4) blowing purification and reduction
Blow, approach after tapping temperature, interpolation reductive agent, adjustment alloying constituent etc. are the same.
5) iron carbide or greying
With embodiment 1.
Claims (10)
1. adopt remelting furnace blowing smelting and purify a method of producing cast iron, it is characterized in that comprising following operation:
the charging batching phase, in having the remelting body of heater of blowing function, add iron-bearing material and auxiliary material;
-1 melting period, heat up, slag making;
blowing purification and reduction period, be blown into gas to melt, makes reducing slag;
iron carbide or greying.
2. adopt according to claim 1 remelting furnace blowing smelting and purify the method for producing cast iron, it is characterized in that: the addition manner of auxiliary material is:
In operation
and operation
in skim before add auxiliary material amount be 1.5～10%(W of iron-bearing material total amount); In operation
iron-bearing material in sneak into auxiliary material, the auxiliary material of input is auxiliary material 20～90% of the total amount that feeds intake; In operation
before the skimming of melting period, add or the auxiliary material of portion-wise addition remainder; Described in it, auxiliary material is oxide-based, the carburelant class of lime base class, manganese; Wherein silica-based class is quartz sand or/and silicon carbide, lime, fluorite, and its ratio is fluorite 0～10%(W), lime is 10～30%(W), quartz sand 40～80%(W), or with silicon carbide, replace 0～70%(W) quartz sand; Silica-based class is 1～6%(W of iron-bearing material total amount);
Wherein manganese oxide-based is one or more combination in rich manganese slag, rich manganese ore, manganese monoxide, Manganse Dioxide; Adding the oxide-based of manganese is 0～1%(W of iron-bearing material total amount); Wherein carburelant class is coke grain, graphite ore, carbon dust, broken graphite electrode slab, silicon carbide; Adding carburelant class is 0.5～3 % of iron-bearing material total amount;
In operation
with
after skimming, add silica-based class auxiliary material; Auxiliary material is quartz sand, lime, fluorite, and ratio is fluorite 0～10%(W), lime 20～40%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand, be 0.5～4%(W of iron-bearing material total amount); In operation
after skimming, add the oxide-based of manganese and carburelant class, making containing manganese total amount is iron-bearing material total amount 0～2%(W), making carbon containing total amount is iron-bearing material total amount 2～4%(W).
3. adopt according to claim 1 remelting furnace blowing smelting and purify the method for producing cast iron, it is characterized in that: when using remelting furnace, being also included in operation
-1 He
between add operation
-2 heating by O2 blowing oxidation period, are blown into gas to melt, make oxidation sludge; The addition manner of auxiliary material is:
In operation
and operation
or/and operation
skim before add auxiliary material amount be 3.5～15%(W of iron-bearing material total amount); In operation
iron-bearing material in sneak into auxiliary material, the auxiliary material of input is auxiliary material 20～90% of the total amount that feeds intake; In operation
or/and operation
in skim before add or the auxiliary material of portion-wise addition remainder; Described in it, auxiliary material is oxide-based, carburelant class, iron oxide-based of silica-based class, manganese; Wherein silica-based class is quartz sand or/and silicon carbide, lime, fluorite, and its ratio is fluorite 0～10%(W), lime is 10～30%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand; Silica-based class is 2～6%(W of iron-bearing material total amount); Wherein manganese oxide-based is one or more combination in rich manganese slag, rich manganese ore, manganese monoxide, Manganse Dioxide; Adding the oxide-based of manganese is 0～1%(W of iron-bearing material total amount); Wherein carburelant class is coke grain, graphite ore, carbon dust, broken graphite electrode slab, silicon carbide; Adding carburelant class is 1～5%(W of iron-bearing material total amount); Wherein iron oxide-based is the iron rust in iron fine powder, iron ore, iron scale, iron scale, brown iron oxide, iron-bearing material; The oxide compound that adds iron is iron-bearing material total amount 0.5～3%(W);
In operation
in skim after add silica-based class auxiliary material; Auxiliary material is quartz sand, lime, fluorite, and ratio is fluorite 0～10%(W), lime 20～40%(W), quartz sand 40～80%(W), or with silicon carbide, replace 20～70%(W) quartz sand, be 0.5～4%(W of iron-bearing material total amount); In operation
in skim after add the oxide-based of manganese and carburelant class, making containing manganese total amount is iron-bearing material total amount 0～2%(W), making carbon containing total amount is iron-bearing material total amount 2～4%(W).
4. adopt according to claim 3 remelting furnace blowing smelting and purify the method for producing cast iron, it is characterized in that: described operation
in gas that melt is blown into be oxygen or oxygen enrichment, when raw material is molten into 30%～100%, to being blown into oxygen in raw material or oxygen enrichment is fluxed, oxygen pressure is 0.2～0.8 MPa, oxygen-supplying amount is 1.5～25m
3/ t, wherein the oxygen level of oxygen enrichment is 30%～93%.
5. adopt according to claim 1 blowing smelting and purify the method for producing cast iron, it is characterized in that: described operation
in, the gas that melt is blown into is for being blown into N
2, CO
2, in Ar one or more.
6. adopt according to claim 1 remelting furnace blowing smelting and purify the method for producing cast iron, it is characterized in that: described operation
in body of heater is blown into the mode of gas, for inserting gas blow pipe or/and install blowing function additional in bottom in remelting furnace; Or/and in ladle by inserting gas blow pipe or/and install blowing function additional in bottom; Gas blow pipe adopts water-cooled copper, common steel tube, high temperature coating aluminized steel tube, hot metal pipe, vitrified pipe, metal ceramic tube, from top, fire door, sidepiece be blown into gas; High temperature coating aluminized steel tube, hot metal pipe, vitrified pipe, metal ceramic tube for gas blow pipe, insert in steel water and blow.
7. adopt according to claim 1 remelting furnace blowing smelting and purify the method for producing cast iron, it is characterized in that: described operation
in, also comprise body of heater extracting vacuum; At reduction period, to use water-ring pump and vapor jet pump or use separately water-ring pump, extracting vacuum auxiliary furnace bottom blowing enter gas, after reaching vacuum tightness 10～300Pa, 5～the 20min that bleeds, reduces the content of gas and inclusion, further removes obnoxious flavour, inclusion and volatile substances.
8. adopt according to claim 1 remelting furnace blowing smelting and purify the method for producing cast iron, it is characterized in that: described remelting body of heater is any in electric arc furnace, induction furnace, plasma heating furnace, electron beam furnace; The furnace lining of body of heater is acid.
9. adopt according to claim 1 remelting furnace blowing smelting and purify the method for producing cast iron, it is characterized in that: described remelting body of heater, the purposes of body of heater is remelting furnace, holding furnace, electric furnace addition of vacuum de-gassing vessel; Electric arc furnace is three-phase stove and Once-through Boiler; Induction furnace is main frequency furnace, intermediate frequency furnace or high frequency furnace; Electric furnace uses separately a kind of and multiple use of combining.
10. for adopting remelting furnace blowing smelting and purification to produce an equipment for the method for cast iron described in claim 1, it is characterized in that: remelting furnace bottom of furnace body (1) has opening; Gas blow pipe (2) and the corresponding setting of bottom of furnace body (1) opening, be filled with the gas permeable brick (3) of isolating melt in the opening of remelting furnace bottom of furnace body (1); Outside gas blow pipe (2), there is cooling water circulation securing system (4).
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| CN105603204A (en) * | 2016-03-21 | 2016-05-25 | 河南省西保冶材集团有限公司 | Remelted mold powder of austenite valve steel and preparation method of remelted mold powder |
| CN106636874A (en) * | 2016-12-22 | 2017-05-10 | 浙江品川精密机械有限公司 | Machine tool cast iron and preparing method thereof |
| CN106756429A (en) * | 2016-11-15 | 2017-05-31 | 墨宝股份有限公司 | A kind of casting technique of petroleum machinery preventer steel-casting |
| CN107365885A (en) * | 2017-08-28 | 2017-11-21 | 广东荻赛尔机械铸造股份有限公司 | Diesel Engine Cylinder Block Castings and its casting method |
| CN112746215A (en) * | 2020-12-25 | 2021-05-04 | 北京首钢吉泰安新材料有限公司 | Smelting method of steel with uniform components and containing low-melting-point and high-density elements |
| CN114854938A (en) * | 2021-07-23 | 2022-08-05 | 包头洪盛化工有限责任公司 | Refining titanium-removing slag and low-titanium ferrochromium refining titanium-removing method |
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| CN105603204A (en) * | 2016-03-21 | 2016-05-25 | 河南省西保冶材集团有限公司 | Remelted mold powder of austenite valve steel and preparation method of remelted mold powder |
| CN106756429A (en) * | 2016-11-15 | 2017-05-31 | 墨宝股份有限公司 | A kind of casting technique of petroleum machinery preventer steel-casting |
| CN106636874A (en) * | 2016-12-22 | 2017-05-10 | 浙江品川精密机械有限公司 | Machine tool cast iron and preparing method thereof |
| CN107365885A (en) * | 2017-08-28 | 2017-11-21 | 广东荻赛尔机械铸造股份有限公司 | Diesel Engine Cylinder Block Castings and its casting method |
| CN107365885B (en) * | 2017-08-28 | 2019-01-18 | 广东荻赛尔机械铸造股份有限公司 | Diesel Engine Cylinder Block Castings and its casting method |
| CN112746215A (en) * | 2020-12-25 | 2021-05-04 | 北京首钢吉泰安新材料有限公司 | Smelting method of steel with uniform components and containing low-melting-point and high-density elements |
| CN114854938A (en) * | 2021-07-23 | 2022-08-05 | 包头洪盛化工有限责任公司 | Refining titanium-removing slag and low-titanium ferrochromium refining titanium-removing method |
| CN114854938B (en) * | 2021-07-23 | 2023-07-25 | 包头洪盛化工有限责任公司 | Refining titanium-removing slag and low-titanium ferrochrome refining titanium-removing method |
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Address after: 441000 Xinhua Road Institute of commercial automation, Xiangfan hi tech Zone, Hubei Applicant after: Xiangyang Jie Long Feilong Machinery Manufacturing Co., Ltd. Address before: 441003 No. 23, Xinhua Road, Hubei, Xiangfan Applicant before: Xiangyang Kangjie Feilong Electrical Co., Ltd. |
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