CN103556068A - Method for producing weather-resisting steel by using low-grade nickel ores - Google Patents
Method for producing weather-resisting steel by using low-grade nickel ores Download PDFInfo
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Abstract
The invention relates to a method of producing weather-resisting steel by using low-grade nickel ores, belonging to the technical field of production of weather-resisting steel. The method comprises the following steps: uniformly mixing nickel laterite ores serving as an accessory material and steelmaking slag serving as a premix accessory material with other main materials and auxiliary materials; producing sintered ores with indexes suitable for production of a blast furnace by controlling parameters of a sintering link; feeding the sintered ores and high-grade pellets and lump ores in the blast furnace in proportion, smelting molten iron containing residual elements of nickel and chromium; and smelting molten iron containing residual elements of nickel and chromium with weather resistance by using the molten iron through a converter to produce the weather-resisting steel. The method has the advantages that smooth sintering, blast furnace ironmaking and converter steelmaking processes can be ensured and the alloy cost for production of the weather resisting steel can be saved. The method overcomes the problems in existing smelting technology by using nickel laterite ores that drum index of the sintered ores is low, the rate of return mine is high, the low-temperature reduction degradation index is low, ironmaking energy consumption is high, production efficiency is low, and the molten iron is not suitable for converter smelting. The application value of existing low grade nickel laterite ores is improved.
Description
Technical field
The invention belongs to weather resisting steel production technical field, particularly provide a kind of low-grade laterite nickel ore and bessemer furnace slag of utilizing to join the method that ore deposit produces weathering steel.The low-grade laterite nickel ore that allocation ratio is no more than the 9.9%Wt of iron ore material in agglomerate produces the agglomerate that contains nickel and chromium, the proportioning that accounts for 65%~82%Wt by agglomerate with this agglomerate and pellet and lump ore enters the molten iron of the nickeliferous and chromium of blast-furnace smelting, and with production weather resisting steel, save the addition of steel making working procedure precious metal nickel and chromium.
Background technology
Weathering steel, weather resisting steel, is the low alloy steel between ordinary steel and stainless steel.Weathering steel adds the corrosion-resistant element such as a small amount of copper, phosphorus, chromium, nickel by straight carbon steel and manufactures, by these elements that add, can make steel in process, be easy to form fine and close Rust Layer Structure under arms, blocking-up steel matrix metal contacts with atmospheric environment medium, thereby delay the corrosion speed under atmospheric environment, improve the service life of steel.Under equal conditions, the work-ing life of weathering steel in atmosphere is general carbon steel 2~8 times.
Weather resisting steel is generally produced with the method for " converter smelting-continuous casting and hot rolling-(cold rolling) " at present, method is to take ordinary blast molten iron as raw material, by bessemerizing, in stove, add copper, nickelalloy, after tapping process and stove, add chromium and other alloy and reductor, and finely tune and make composition reach control target by alloy.At steel making working procedure, adding atmospheric corrosion resistance alloying element is a principal character of produced in conventional processes weather resisting steel.
Owing at the added chromium of steel making working procedure, nickel, copper etc. being all generally technical grade pure metal or through smelting the alloy obtain, the cost that makes weather resisting steel obviously raises compared with the General Structural Steel of same level because of the interpolation of these alloying elements.For example in weather resisting steel finished product, the control target of nickel, chromium, copper is 0.12%Wt, 0.45%Wt, 0.30%Wt, the control target of manganese is during than the low 0.6%Wt of General Structural Steel, by current metallurgy, with 105000 yuan/ton of sheet nickel prices, 13000 yuan/ton of low-carbon (LC) 60CrFe alloys, metallurgy, by copper coin price, it is 50000 yuan/ton, because cost of alloy is about 300 yuan/ton.
Can not add in addition or add less alloy, also can make finished product composition reach target call and obviously can save cost of alloy.For example add less the Ni of 0.12%Wt, add less the Cr of 0.20%Wt, the cost of alloy of saving should be 165 yuan/ton.
At present China is at a large amount of a kind of nickel oxide ores of import, and with productions nickel-contained pig iron, year an import volume be about 4,000 ten thousand~7,000 ten thousand tons.The composition of this nickel oxide ore is configured to: containing the water of 20~45%Wt, containing the iron of 20~53%Wt, the nickel of 0.5~2.5%Wt, containing the chromium of 0.5~4.5%Wt, containing micro-cobalt, all the other are oxygen and various gangue impurity, wherein in impurity, generally contain the Al of 3%~17%Wt
2o
3, 2.6%~30% SiO
2.Conventionally this nickel oxide ore is called to red soil nickel ore.Red soil nickel ore mainly carries out classification by nickel content, and nickel content is higher, and higher to producing the economic worth of nickeliferous ferrous metal enterprise, price is also more expensive.
It is that to take more nickelic grade red soil nickel ore be main raw material that China utilizes the main method of red soil nickel ore, by blast furnace, with pyrogenic process, produces nickel-contained pig iron, replaces a part of nickel metal and Chrome metal powder when at smelting stainless steel with containing the steel alloy of Ni.
Owing to being difficult to that under existing industrial technology condition iron content and nickeliferous ore deposit are separated, so while producing nickel-contained pig iron with red soil nickel ore, the more high Rhometal that is more difficult to obtain high nickel content of iron level.Therefore in fact high Fe content becomes the burden of producing nickel-contained pig iron with nickel oxide ore.With red soil nickel ore, join agglomerate production melted iron directly smelting weathering steel can make iron and nickel resources in red soil nickel ore all obtain maximum value embodiment simultaneously.
Produce nickel-contained pig iron and red soil nickel ore need to be carried out to processed, screening, levigate after, be made into mixing ore deposit more than laterite accounting 20%Wt, by sintering, make agglomerate again, entering blast-furnace smelting goes out to contain compared with the molten iron of high nickel content, cast pig for steel-making, or with this molten iron directly and other iron and steel scrap raw materials, alloy carry out proportioning, by electric furnace, refine the steel alloy of stainless steel or Ni and Cr contained.This method can effectively be utilized the nickel metals resources in low price red soil nickel ore, makes it to embody economic worth.As the publication number Patent Application Publication that is CN102220484 the manufacture method of the agglomerate that used of this method.In this class manufacture method, be generally must dewater in advance to red soil nickel ore, broken, screening processes, and the red soil nickel ore manufacture agglomerate after dehydration as much as possible, with addition of the amount of red soil nickel ore more than 20%Wt, to scheme to reduce by increasing laterite consumption at a low price the cost of the metal that obtained.But in advance red soil nickel ore is carried out to processed and must increase special-purpose dehydration equipment, as rotary kiln etc.Because the moisture of red soil nickel ore surpasses 20%Wt, for overcoming the erosion of moisture to equipment, processed also can be very high to the requirement of equipment, and dehydration also will increase a part of energy consumption.Have that facility investment is large, energy consumption is high, be easy to produce the problem of environmental pollution.When low with addition of the ratio of the made agglomerate of red soil nickel ore while entering stove, the nickel metal content in the pig iron or molten iron is still not enough, while entering stove with addition of the made agglomerate ratio of red soil nickel ore when high due to the impurity in red soil nickel ore too much, Fe
2o
3ratio is large, and low, the low temperature resistant reduction disintegration of tumbler index of agglomerate is poor, and grade of sinter is also low, causes blast furnace coke ratio high, and economy is bad.Such agglomerate is used the threat of the smooth and easy production of blast furnace large in large blast furnace, and risk is high.
The patent No. be in the patent documentation of CN102321849B disclosed method be by red soil nickel ore after processed in 10%~90% ratio and the iron ore iron ore material that is mixed, through sintering, obtain agglomerate, with this agglomerate, enter blast furnace and produce after molten iron directly by converter or electrosmelting containing chromium 0.05~6.0%, nickel is at 0.05~3.0% steel alloy and contain the reinforcing bar of chromium, nickel.Equally, due to addition of red soil nickel ore ratio be not less than 10%, reach 10~90%, high because containing a large amount of moisture and allocation ratio in red soil nickel ore, so cannot be directly used in sintering, and must increase processed operation.It proposes two kinds of dewatering types, and a kind of is to dry, and another kind is that the unslaked lime that is added to 3~15% weight ratios of red soil nickel ore, sodium carbonate, sodium bicarbonate, kaolin, wilkinite, zeolite powder etc. are as water-retaining agent.Before a kind of dewatering type exist equally energy consumption high, and or exist compared with large equipment investment or because be simply equipped, cause the problem of environmental pollution.Rear a kind of dewatering type, because will increase in addition dewatering agent, still can there is the problem of extra increase raw materials cost, dewatering agent still will be blended in sintering mineral aggregate after water suction simultaneously, the moisture adsorbing finally still will be taken off in sintering process, so energy consumption can not reduce because of increasing dewatering agent, and if dewatering agent is sodium carbonate, sodium bicarbonate, it decomposes in sintering process can increase energy consumption in addition, and degradation production can be to bringing harm blast furnace campaign.Kaolin, wilkinite all can increase the impurity component in agglomerate, cause the grade in ore deposit to decline, and increase Ironmaking Coke Ratio and the quantity of slag.
Because the dosage of red soil nickel ore in agglomerate surpasses 10%, will cause barrate strength to reduce, the rate of return mine increases, and low temperature reduction degradation index index degenerates.Because grade of sinter reduction amplitude is large, adopt the blast furnace coke ratio of clean burn knot ore deposit smelting molten iron to raise, economy is bad simultaneously.How the molten iron obtaining in fact chromium content can surpass 0.50%Wt.Such molten iron is more suitable in electrosmelting.In conventional top blast or top and bottom combined blown converter, because the amount of oxidation of chromium in molten iron is many higher than 40%, Cr in the later stage slag that causes blowing
2o
3content large, adhesivity strengthens, and is unfavorable for bessemerizing operation and slag splashing and operates.
Press described in the summary of the invention in document, it is 1~2.0% red soil nickel ore that its technological method is also only applicable to chromium content.And nearly half the chromium content of current found red soil nickel ore is in the scope of > 2.0~5.0% and Cr < 1%, by its technological method, can not utilize such red soil nickel ore.
In brief, the disclosed technology of above-mentioned document, by red soil nickel ore is first carried out to drying and dewatering processing, in the ratio that is by weight percentage 10%~90%, with addition of sintering in sintered iron material, obtain agglomerate again, as blast furnace raw material smelting molten iron, through converter or electrosmelting Cheng Gang, utilized the residual volume of nickel, chromium in red soil nickel ore to obtain a kind of carbon content with certain weather resistance and be not less than 0.1%, Mn content and be not less than 0.8% alloy steel products.Still exist and 1. need laterite to dewater in advance, increase the energy consumption cost of a procedure.While 2. adopting drying mode to dewater to red soil nickel ore, increase investment and the maintenance cost of drying plant, and easily because being simply equipped, cause problem of environmental pollution.3. adopt when red soil nickel ore is dewatered with addition of sorbent material mode, water-retaining agent degradation production is to impacting blast furnace campaign.4. the red soil nickel ore amount of allocating into surpasses 10%, is up to 90%, cannot avoid the barrate strength causing because of impurity height to reduce, and the rate of return mine increases problem.Cannot avoiding dosage, large brought because of grade of sinter, to reduce amplitude large, adopts the blast furnace coke ratio of clean burn knot ore deposit smelting molten iron to raise, and production efficiency significantly declines, the problem that economy is bad.Cannot avoid because impurity is high, Fe
2o
3large the brought bad problem of low temperature resistant pulverability of ratio.5. the molten iron chromium content going out directly into blast-furnace smelting surpasses 0.5% more, with converter smelting, easily causes slag viscous, is unfavorable for bessemerizing operation and slag splashing operation, is therefore not suitable for directly utilizing molten iron to carry out STEELMAKING PRODUCTION with converter.6., in the time of will controlling chromium content, the chromium content in necessary restriction red soil nickel ore, 1~2%, causes deficiency and the problems such as a part of low-grade laterite nickel ore can not be used effectively.
The patent application of CN102220484, red soil nickel ore dosage is up to more than 20%, and not only grade of sinter reduction brings productivity low high with coke ratio, and brings the Al in agglomerate into by red soil nickel ore
2o
3, SiO
2foreign matter content and Fe
2o
3content more can cause the barrate strength of agglomerate itself low, and low temperature reduction degradation index index is bad, is not suitable for large blast furnace and produces.
To sum up, in prior art, still do not comprise and use low-grade laterite nickel ore to join agglomerate, both ensured that the indexs such as Sinter Tumber Index, low-temperature reduction disintegration were good, can make again joined agglomerate and pellet fit in proportion large blast furnace, safety economy ground smelts nickeliferous, chromium hot melt, and passes through the rational method of converter smelting weathering steel with this molten iron.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing low grade nickel ore to produce weather resisting steel, overcome that in existing application red soil nickel ore smelting iron technology, Sinter Tumber Index is low, rate of return mine high and low temperature reduction disintegration index is bad, ironmaking energy consumption is high, production efficiency is low, molten iron is not suitable for the problems such as converter smelting.Improved the using value of existing low-grade laterite nickel ore.
The present invention proposes and a kind ofly take red soil nickel ore and prepare burden as a kind of premix as a kind of batching, the bessemer furnace slag of take, be mixed evenly with other major ingredients, auxiliary material, by controlling sintering link parameter, produce the agglomerate that indices is applicable to blast furnace production, and allocate in proportion blast furnace into this agglomerate and higher-grade pellet and lump ore, the molten iron that smelting contains nickel, chromium residual element, with this molten iron, by converter smelting, contain possess chromium, the nickel of atmospheric corrosion resistance effect, the molten steel of phosphorus residual element, with the method for production weather resisting steel.This method can ensure sintering, blast furnace ironmaking, converter steelmaking process direct motion, and operation comprehensive cost does not increase, and can save the cost of alloy of producing weathering steel simultaneously.
Step of the present invention comprise join ore deposit-to red soil nickel ore batching carry out premix screening, be transported into feed bin, mix pelletizing, cloth, sintering-agglomerate are broken, screening-allocate in proportion blast furnace ironmaking-converter steelmaking-(refining)-continuous casting-rolling into pellet.
The component of main raw material used of the present invention is
1) red soil nickel ore raw material
The red soil nickel ore raw material using is powdery red soil nickel ore, and butt components based on weight percentage is
TFe:26%~53%,SiO
2:2.6%~30%,CaO:0~2%,MgO:0~13.5%,AL
2O
3:3~15%,Ni:0.6~2.5%,Cr:0~4.0%,S:0.02~0.15%,P:0.001~0.05%,TiO
2:0~0.5%。All the other are oxygen and other inevitable impurity.
Be mainly nickeliferous low low-grade laterite nickel ore, butt components based on weight percentage is
TFe:42%~53%,SiO
2:2.6%~5%,CaO:0~2%,MgO:0~2%,AL
2O
3:3~15%,Ni:0.6~1.2%,Cr:0.5~4.0%,S:0.02~0.15%,P:0.001~0.05%,TiO
2:0~0.5%。All the other are oxygen and other inevitable impurity.
Contained humidity is 18%~45% by weight percentage.
2) bessemer furnace slag raw material
The bessemer furnace slag raw material butt components based on weight percentage of using is
TFe:22%~40%, SiO
2: 5%~15%, CaO:30~40%, MgO:2~12%, AL
2o
3: 2~4%, all the other are oxygen and other inevitable impurity.Contained humidity is 0~9%.
3) other join mining main iron ore raw material
Butt iron content is 56~71% iron ore meal and iron ore extract powder by weight percentage.
4) other internal recycle iron ore raw materials
Butt iron content is 54~58% return mine by weight percentage; Butt iron content is 35~50% blast furnace gravitational dust collection ash by weight percentage; Butt iron content is steel mill's circulation depositing in water mud of 48~52% etc. by weight percentage.
5) Iron Ore Matching in Sintering auxiliary material
Unslaked lime: containing CaO >=75%, and more high better; Limestone powder: containing CaO >=48%, and more high better; Magnesium slag: MgO >=40%, and more high better.
Coke powder: impurity≤15% beyond butt C, and more low better.
6) pellet and lump ore for ironmaking
TFe content by weight percentage >=61%, best >=63%, more high better.SiO
2:4.5~6.5%。Other are oxygen and inevitable impurity.
The technical parameter of processing step of the present invention and control is as follows:
1) join ore deposit
With above-mentioned iron ore meal and iron ore extract powder, red soil nickel ore, bessemer furnace slag, steel mill's internal recycle ferric charge, unslaked lime, limestone powder, magnesium slag, coke powder etc., carry out agglomerate and join ore deposit.The whole red soil nickel ores that add account for the butt ratio that agglomerate is all joined ore deposit raw material, are 2.5~9.9% by weight percentage.
The whole bessemer furnace slags that add, comprise red soil nickel ore are carried out to the bessemer furnace slag that premix adds, and the butt ratio that its total amount accounts for the whole raw materials of agglomerate is 1~2% by weight percentage.
The components based on weight percentage of gained agglomerate is
TFe:52.0~55.5%,SiO
2:5.2%~6.2%,CaO:8.8~13.0%,MgO:2.6~3.8%,AL
2O
3:1.3~3.1%,Ni:0.030%~0.15%,Cr:0~0.25%。All the other are oxygen and inevitable impurity.Dual alkalinity CaO/SiO
2: 1.7~2.2.FeO Content in Sinter is controlled by 7%~9.5% weight percent.
2) screening of the premix of red soil nickel ore is processed
The working method of premix is, to for 10%~50% slag of red soil nickel ore weight with for 5%~30% unslaked lime and red soil nickel ore of red soil nickel ore weight, puddle by weight, can be incorporated as simultaneously red soil nickel ore weight 0~10% magnesium slag, be that 0~15% blast furnace gravitational dust of red soil nickel ore weight is puddled together with red soil nickel ore.Red soil nickel ore after puddling, take moisture preventive measure, and will in 120 hours, complete screening, sieves out the premix red soil nickel ore that granularity is less than 8mm standby.Premix red soil nickel ore after screening will be taked moisture preventive measure, and in 18 hours, is transported into sinter machine feed bin for SINTERING PRODUCTION.
The dosage adding in red soil nickel ore premix process is being joined when calculate in ore deposit and will taken into account.The macrobead ferric charge sieving out carries out being recycled after fragmentation.
3) sintering process is controlled
By agglomerate butt raw material, allocating carbon amount into is that 3.5~4.8%Wt adds coke powder and coal dust, by total moisture in compound, is 12~16% to control moisture additions, at the pelletizing unit of puddling of sinter machine, mixes each raw material pelletizing.
Evenly complete backing material, backing material thickness 20~40mm, then by the even cloth of compound on backing material.Bed thickness is determined according to sinter machine situation, 1100~1270 ℃ of ignition temperatures.Air quantity 80~120m
3/ m
2.min, 200~450 ℃ of sintering end point temperature, 80~150 ℃ of spent air tempertures.
The agglomerate burning till through cooling, broken, screening after, be directly transported into blast furnace or land standby.
4) ironmaking iron charge proportioning
Agglomerate after screening and high-grade pelletizing+lump ore, 65%~82% the ratio that accounts for iron ore material according to agglomerate packs blast furnace ironmaking into.Comprehensive feed grade by weight percentage, is TFe >=55%, best >=56%; Enter ratio Ni/Fe:0.04%~0.20% of Ni in furnace charge and the weight of Fe, enter ratio Cr/Fe:0~0.35% of Cr in furnace charge and the weight of Fe.
5) ironmaking
Iron-smelting process adopts the ordinary skill in the art.
In gained molten iron, the content of nickel is 0.04%~0.20% by weight percentage, and the content of chromium is 0~0.35% by weight percentage.
6) steel-making
The molten iron of being produced by above-mentioned steps supplies top blast or top and bottom combined blown converter smelting molten steel after desulfurization pre-treatment, or directly supplies top blast or top and bottom combined blown converter smelting molten steel.
One-tenth partial objectives for for smelted weathering steel, the remaining nickel burn out rate in molten iron of take is 5%, in molten iron, residual chromium burn out rate is 50% as reference, the molten iron raw material requiring for the discontented foot-eye of nickel, in stove, add in advance nickel plate, and in stove, add in advance part copper alloy by the composition requirement of weathering steel.Tapping process adds Chrome metal powder adjusting component.After tapping and in furnace rear refining process, finely tune composition.
All the other techniques are identical with the ordinary skill in the art.
The weathering steel composition of smelting by weight percentage, for:
C:0.03~0.12%, Ni:0.06~0.30%, Cr:0.30~0.55%, Cu:0.25~0.35%, P:0.06~0.10%, S :≤0.030%, Si:0.10~0.55%, Mn:0.15~0.65%; Surplus is Fe and inevitable impurity.
Or, C:0.03~0.12%, Ni:0.06~0.30%, Cr:0.30~0.75%, Cu:0.25~0.35%, P :≤0.030%, S :≤0.030%, Si:0.10~0.55%, Mn:0.15~0.65%; Surplus is Fe and inevitable impurity.
Or C:0.03~0.12%, Ni:0.06~0.30%, Cr:0.30~1.25%, Cu:0.25~0.35%, P :≤0.030%, S :≤0.030%, Si:0.10~0.55%, Mn :≤1.50%; Can select to add one or two or more kinds microalloy element in Nb, V, Ti, by weight percentage, three's sum is no more than 0.22%, and surplus is Fe and inevitable impurity.
The above-mentioned steel that meets the requirement of weathering steel composition obtains strand through continuous casting, obtains weather-proof with rolled steel plate, singly offset the products such as plate, shaped steel, angle steel after hot rolling.Rolling technology is identical with the existing routine techniques of this area.
The reason that each link critical technical parameter is selected is as follows:
A) why the present invention adopts slag, unslaked lime and magnesium oxide breeze etc. to carry out premix processing to red soil nickel ore, be because red soil nickel ore in except crystal water, also contain free-water.These free-waters cause red soil nickel ore bonding, in sintering unit whipping device, are difficult for stirring, and affect coking property.By removing gangue before premix, and add slag, unslaked lime, magnesium slag, make that red soil nickel ore loses viscosity, the loose and epigranular that becomes, not only make it to be easy to be easy to trickle down from sinter machine feed bin, be also easy to mix.
The ratio of the slag B) adopting about premix, unslaked lime and magnesium oxide breeze, is decided by the ratio of free-water in red soil nickel ore.When in red soil nickel ore, moisture is 20%, free-water is about 5%, adds red soil nickel ore part by weight 1/10 slag to be just enough to make red soil nickel ore lose viscosity, and another polygamy adds 1/20 unslaked lime of red soil nickel ore part by weight, can make red soil nickel ore looser, be easy to mix.When the water-content in red soil nickel ore reaches 45%, free water content will reach 30%, if at this moment red soil nickel ore with addition of amount, to reach butt be 9.9% maximum value, with addition of unslaked lime amount need reach maximum value.And allocate whole slags that need to be fitted in agglomerate and the magnesium oxide breeze of maximum ratio into, and just can make red soil nickel ore lose viscosity, become loose and be easy to and stir.When the red soil nickel ore amount of allocating into is few, by 50% of red soil nickel ore total amount, allocate slag into, be conducive to slag and red soil nickel ore and in subsequent handling, in material, mix simultaneously.
C) unslaked lime adding, magnesium slag are requisite solvents in sintered material, and slag also has the effect of solvent.These materials, owing to having added a part in premix process, when follow-up interpolation solvent, carry out equivalent deduction.
D) why the present invention requires the red soil nickel ore after premix within 120 hours, to complete screening, it is the leaching due to moisture because of the red soil nickel ore after premix, place over being easy to harden after 120 hours, the raw material ratio regular meeting of the suitable particle size obtaining after screening reduces.After screening, in 18 hours, being transported into sinter machine feed bin is also in order to prevent that the mineral aggregate after screening from hardening, the direct motion of impact production for the reason of SINTERING PRODUCTION.
E) in the present invention, why select control to be no more than 9.9% with addition of the upper limit of red soil nickel ore, have four reasons: the one, in red soil nickel ore, contain higher SiO
2, AL
2o
3, with addition of amount, higher than 9.9%, be easy to because of AL
2o
3the high low temperature resistant powder performance of agglomerate that causes of content degenerate, cause blast furnace coke ratio raw high.With addition of amount, be no more than 9.9%, the low nickel laterite of high ferro of most of type can meet after joining makes AL
2o
3content is unlikely to affect blast furnace coke ratio.The 2nd, with addition of amount, higher than 9.9%, be easy to make the Cr/Fe ratio in agglomerate to raise, for controlling molten iron chrome content, do not exceed the scope of suitable converter smelting, the agglomerate ratio entering in furnace charge will decline, and the economy of ironmaking will be affected.The 3rd, because the iron grade of red soil nickel ore is lower, water content is large.The amount of allocating into is greater than 9.9%, and the unslaked lime adding and the amount of slag increase, and is maintaining under the prerequisite that sinter basicity is constant, during follow-up being mixed, continue with addition of quantity of solvent can reduce, cause solvent being all evenly mixed in mineral aggregates, not have influence on the one-tenth ore deposit property of agglomerate.And the reduction of the grade of agglomerate, be to guarantee feed grade, need to otherwise enter the comprehensive grade of stove, reduce with addition of more pellet, blast furnace energy consumption raises, yield reducation, the economy variation that all can make blast furnace produce.And red soil nickel ore dosage is no more than 9.9%, utilize the red soil nickel ore of various compositions to be all easy to obtain grade at more than 52% agglomerate, can ensure the economy that blast furnace is produced.
F) why the present invention selects to be not less than 2.5% with addition of the lower limit of red soil nickel ore, is to remain and be enough to surpass 0.035% nickel content in molten steel in order to make, and makes its economic worth be enough to offset the process cost because increasing with addition of red soil nickel ore.With addition of the lower limit of red soil nickel ore lower than 2.5%, premixed process cost increases, and the remaining nickel content of molten iron is lower than 0.035%, and the value of the saving cost of alloy of bringing is on the low side, be not enough to offset equipment operation energy consumption cost and the cost of labor that application red soil nickel ore increases.
G) why the present invention selects to allocate under the butt ratio of bessemer furnace slag and is limited to 1%, is in order to save a part of unslaked lime when to red soil nickel ore premix, makes bessemer furnace slag be able to regeneration simultaneously.Bessemer furnace slag can play dilution moisture, and makes the loose effect of red soil nickel ore.Lower than 1% time, the slag amount of regeneration is limited, and the economic worth that substitutes unslaked lime is also not obvious.
H) why the present invention selects to allocate in the butt ratio of bessemer furnace slag and is limited to 2%, is because contain AL in the slag utilizing
2o
3more than 3%, and there is higher SiO
2, and iron grade is low.The amount of allocating into surpasses 2%, and for guaranteeing the economy of agglomerate, other contain AL red soil nickel ore etc.
2o
3the amount of allocating into of low price raw material also will be restricted.The amount of allocating into is lower than 2%, not obvious for the impact of agglomerate economy.
I) the present invention determines the reasons are as follows of component target of agglomerate:
The grade of agglomerate iron is not less than 52%, be because during lower than this value, make feed grade reach the more than 56% good level of economy, to the further raising of the grade requirement of joined pellet, lump ore, cause the material choice difficulty of pellet, lump ore to increase, comprehensive economy degenerates.And the iron grade of agglomerate is higher than 55.5%, because the grade of red soil nickel ore is low, just must allocate more high price ore deposit into, economy is variation still.
SiO
2, CaO, MgO, AL
2o
3it is requisite solvent composition in agglomerate, control it in the scope of the present invention's regulation, can ensure with addition of the agglomerate of red soil nickel ore and there is more than 75 barrate strengths, and join the low-temperature reduction disintegration index of ore deposit gained agglomerate par with conventional raw material.AL
2o
3higher than 3.1, low-temperature reduction disintegration index variation not only, blast furnace slag charge amount also increases, and the impact of furnace processor is also become to obvious.MgO, more than 2.6%, can ensure AL
2o
3low-temperature reduction disintegration index within the scope of the present invention.Higher than 3.8%, because slag amount increases, economy is bad.Dual alkalinity aspect is lower than 1.7, and low temperature resistant pulverability variation is obvious, surpasses 2.2, should not reach high iron grade index.FeO is lower than 7%, and barrate strength is not enough.Higher than 9.5%, blast furnace coke ratio raises obviously.
Composition fluctuation wide ranges due to red soil nickel ore used, ensure the molten iron for weathering steel that can obtain economic worth in rear operation, with addition of red soil nickel ore butt ratio when reaching more than 2.5%, in the agglomerate of manufacturing, nickel content also needs to reach more than 0.030%.And nickel content in agglomerate is while surpassing 0.15%, the dosage of red soil nickel ore will, over 9.9%, will be brought because of Fe
2o
3total amount increases and AL
2o
3component increases the series of problems such as caused low-temperature reduction disintegration index variation, the increase of blast furnace production energy consumption.Therefore control nickel content on be limited to 0.15%.In regulation agglomerate, the upper limit of chromium content, is to be no more than 0.35% in order to control chromium content in molten iron, so that the chromium in molten iron can not impact converter steelmaking.
J) why the present invention enters to take in blast furnace iron ore material red soil nickel ore to join the ratio of the agglomerate that ore deposit obtains is 65%~82%, low because join the iron grade of the agglomerate that ore deposit obtains with red soil nickel ore, allocate high-grade pellet and lump ore into and can improve feed grade, reduce energy consumption, increase furnace processor.Agglomerate in the present invention enters stove ratio lower than 65% time, will be difficult to obtain the desired molten iron that contains enough nickel residual volumes, so agglomerate of the present invention enters stove ratio lower limit, is defined as 65%.And agglomerate enter stove ratio higher than 82% time, blast furnace energy consumption increase and yield reducation remarkable, affect the risk increase of the smooth and easy production of blast furnace.Therefore agglomerate enters the stove ratio upper limit and is defined as 82%.Comprehensively entering stove iron grade and be not less than 55%, be preferably not less than 56%, is also the constraint condition that energy consumption based on ensureing and output are not less than conventional raw material level.Why institute's smelting molten iron nickeliferous under be limited to 0.04%, be in order further to ensure that gained molten iron embodies the economic worth of saving precious metal nickel when the Smelting Weathering Steel.Molten iron nickel content is lower than 0.04%, and the economic worth of saving nickel in steel-making link is not obvious.Molten iron nickel content is higher than 0.20%, and low-grade agglomerate allocation ratio of the present invention is too high, can cause into the comprehensive grade of stove not enough.Simultaneously because the nickel content in most of weathering steels reaches 0.2% enough, and in steelmaking process the scaling loss amount of nickel lower than 5%, so also there is no need to make the nickel content in molten iron to surpass 0.2%.
Chromium upper content limit in the present invention in molten iron is defined as 0.35%, is because the oxidation meeting of chromium in the process of bessemerizing brings impact to production operation and equipment, so the upper limit of chromium content is defined as 0.35% in molten iron while surpassing this value because of chromium content.
Beneficial effect of the present invention:
Utilization of the present invention is joined ore deposit containing the red soil nickel ore of low ore grade nickel, compare with traditional weathering steel production technique, utilize chromium, the nickel element residual volume in molten steel of join in agglomerate, in producing weathering steel process, can save the addition of precious metal nickel, and save the add-on of Chrome metal powder.
With respect to allocate at high proportion laterite nickel ore for producing sinter and with the technique of production molten iron compare, the Sinter Tumber Index that the present invention produces is not less than 75, it is identical that the rate of return mine and existing routine are joined the agglomerate level that ore deposit sintering process produces.
Method of the present invention, does not increase blast furnace energy consumption, can not reduce furnace processor, can not impact steel making working procedure direct motion.Be suitable for large blast furnace-top blast or top and bottom combined blown converter and produce weathering steel.
The present invention need not be to the red soil nickel ore pre-treatment of dewatering, and the extra energy consumption cost increasing is limited.The present invention utilizes slag, blast furnace gravitational dust collection ash etc. to carry out premix processing to red soil nickel ore, is a kind of approach that digests interior recirculation utilization material.
With method of the present invention, produce weathering steel, omitted the production process of the alloy part that must add in weathering steel, saved the process energy consumption of alloy production process.The precious metal nickel of saving is about weathering steel 0.4~2.0Kg per ton, and the low-carbon (LC) 60CrFe alloy of saving is on average about 2.6Kg of weathering steel per ton, by present market value estimation, 75~240 yuan/ton of escapable costs.According to current China, produce the scale calculating that consumes 5,000,000 tons of weathering steels per year, by method of the present invention, produce weathering steel and can save every year 2000~10000 tons of nickel metals resources, average 6000 tons, be worth 600,000,000 yuan.Save 13000 tons of low-carbon (LC) 60CrFe alloy average out to, be worth 1.7 hundred million.Social benefit is obvious.
By method of the present invention, produce weathering steel, not only effectively utilized the value of the chromium in red soil nickel ore, nickel resources, also make the ferrous metal resource in ore deposit obtain utilization.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Adopt 8 kinds of nickel, chromium content, iron level, impurity and the different red soil nickel ore of moisture, red soil nickel ore is carried out to premix screening to be processed, in the butt ratio of red soil nickel ore in Sintering Blend, be that in 3.2~9.9%Wt, agglomerate, nickel content is that 0.03~0.14%Wt, chromium content are 0.04~0.22%Wt, basicity is 1.7 and 2.1, produce agglomerate, according to agglomerate, account for 70% and 80% of iron ore material and join pellet and enter blast-furnace smelting molten iron, molten iron after desulfurization pre-treatment for converter smelting weathering steel.
The one-tenth of 8 kinds of red soil nickel ores that adopt is respectively in table 1.The pellet of allocating various iron ore materials, fuel, the solvent of agglomerate into and allocating blast furnace into becomes to be respectively in table 2.Red soil nickel ore premix screening pretreatment process parameter is listed in to table 3.
Example 1: the listed red soil nickel ore A of option table 1, press table 3 sequence number for a line of " A " listed, be incorporated as red soil nickel ore weight 20% converter steel ground-slag, be 2% blast furnace gravitational dust of red soil nickel ore weight, 10% the unslaked lime for red soil nickel ore weight, use grab trolley, in premix stock ground, red soil nickel ore is puddled to operation, after puddling, can not sieve in time, concentrate and stack and hide protection against the tide with tarpaulin, in 120 hours, complete screening.The steel mesh that raw material after puddling is 8mm with mesh diameter sieves, sieve out account for raw material gross weight 96% before premix, granularity is not more than the qualified Preblend of 8mm.By Preblend to be directly transported into upper 158m
2dwight-Lloyd sintering machine feed bin.The part that can not be transported in time feed bin hides protection against the tide with tarpaulin, and finishes using in 18 hours.Red soil nickel ore Preblend after selection is puddled and listed various iron ore materials and the auxiliary material of table 2, the red soil nickel ore A butt ratio of take is 6.4% by weight percentage, coke powder butt ratio is 3.57% by weight percentage, and agglomerate all iron content is 54.3% by weight percentage, SiO
2content is 6.0% by weight percentage, MgO content is 2.9%, Al by weight percentage
2o
3content is by weight percentage for being no more than 3.1%, and basicity is 1.7, according to respectively allocating composition, moisture and the scaling loss amount of material into, calculates proportioning carry out Iron Ore Matching in Sintering by linear algebra.At sinter machine, press calculated proportion scale blanking, by total moisture 13%, keep the skin wet, through puddling pelletizing unit, mix and pelletizing.Sintering pallet is completed the backing material that 22mm is thick in advance, and through puddling raw material uniform spreading that pelletizing unit made ball on backing material, bed thickness is with reference to 750mm.Ignition temperature is at 1100~1270 ℃, and air quantity is at 80~120m
3/ m
2.min, sintering end point temperature is at 200~450 ℃, and spent air temperture, at 80~150 ℃, is adjusted flexibly according to the control target of production unit situation and agglomerate physical property.Burn till by cooling, broken, screening after be transported into blast furnace ironmaking.Entering the ratio of pellet and agglomerate in blast furnace ironmaking material is 2:8, wherein pellet all iron content and SiO used
2component concentration is as listed in table 2.The molten iron of blast-furnace smelting gained carries out after desulfurization processing at molten iron KR desulfurization station, at nominal capacity, be Smelting Weathering Steel SPA-H on the top and bottom combined blown converter of 100 tons, converter is controlled target according to the copper of SPA-H steel, according to iron water amount, calculates in advance, and in stove, by copper content, be that 0.28%Wt adds copper coin.According to the molten iron nickel content that detected in advance, the nickel content target of take in molten steel adds the supplementary Rhometal of needs in advance as 0.12%.After being blended into molten iron, blow.After deoxidation, check residual chromium content, and contrast the supplementary chromium of each control of element target, silicon, manganese, phosphorus alloy.After converter tapping, in ladle, by processing requirement Argon, stir 5~12min, calm 5~8min.Through slab caster continuous casting, become the slab of 1050mm width * 200mm thickness, cut after chi and produce freight container SPA-H atmospheric corrosion resistance rolled steel plate for equipment of Hot Strip Mill.
The A of table 3 is capable to be shown this example red soil nickel ore A is carried out to the qualified Preblend ratio that screening obtains after the premix batching additional proportion of premix processing and premix.A line that the sequence number of table 4 is " 1 " is depicted as butt ratio and sintering machine distributing thickness, ignition temperature and the sintering end point temperature representative value of this routine red soil nickel ore in sintering mineral aggregate.Table 5 sequence number is a line of " 1 ", is depicted as the agglomerate indices of this routine gained.The sequence number of table 6 is a line of " 1 ", what be depicted as agglomerate in the blast furnace ferrous material of entering of this example enters stove ratio, and this example enter the comprehensive iron grade of stove, the content of valuable element nickel, chromium in this routine molten iron of chemically examining, and this routine molten iron is after converter smelting, the valuable element residual of being brought by red soil nickel ore being calculated by the composition result of Finished Steel built for in-water survey.The sequence number of table 7 is a line of " 1 ", is depicted as the finished product composition of the weathering steel of being produced with this routine method and the alloy amount of being saved.
Example 2: red soil nickel ore used is A, the red soil nickel ore in sintering mineral aggregate is that 5.0%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 3: red soil nickel ore used is A, the red soil nickel ore in sintering mineral aggregate is that 9.1%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 1.
Example 4: red soil nickel ore used is A, the red soil nickel ore in sintering mineral aggregate is that 5.0%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 3.
Example 5: red soil nickel ore used is B, it is 20% of red soil nickel ore weight that premix is processed the slag amount of allocating into, and the unslaked lime amount of allocating into is 15% of red soil nickel ore weight, and the blast furnace gravitational dust amount of allocating into is 2% of red soil nickel ore weight, and the magnesium slag amount of allocating into is 0.Red soil nickel ore in sintering mineral aggregate is that 9.6%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 6: red soil nickel ore used is B, the red soil nickel ore in sintering mineral aggregate is that 6.6%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 5.
Example 7: red soil nickel ore used is B, the red soil nickel ore in sintering mineral aggregate is that 9.6%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 5.
Example 8: red soil nickel ore used is B, the red soil nickel ore in sintering mineral aggregate is that 6.6%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 7.
Example 9: red soil nickel ore used is C, it is 17% of red soil nickel ore weight that premix is processed the slag amount of allocating into, the unslaked lime amount of allocating into is 11% of red soil nickel ore weight, and the blast furnace gravitational dust amount of allocating into is 1.7% of red soil nickel ore weight, and the magnesium slag amount of allocating into is 10% of red soil nickel ore weight.Red soil nickel ore in sintering mineral aggregate is that 9.9%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 10: red soil nickel ore used is C, the red soil nickel ore in sintering mineral aggregate is that 7.4%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 9.
Example 11: red soil nickel ore used is B, the red soil nickel ore in sintering mineral aggregate is that 9.6%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 9.
Example 12: red soil nickel ore used is C, the red soil nickel ore in sintering mineral aggregate is that 7.4%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 11.
Example 13: red soil nickel ore used is D, it is 20% of red soil nickel ore weight that premix is processed the slag amount of allocating into, and the unslaked lime amount of allocating into is 15% of red soil nickel ore weight, and the blast furnace gravitational dust amount of allocating into is 2% of red soil nickel ore weight, and the magnesium slag amount of allocating into is 0.Red soil nickel ore in sintering mineral aggregate is that 8.2%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 14: red soil nickel ore used is D, the red soil nickel ore in sintering mineral aggregate is that 5.4%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 13.
Example 15: red soil nickel ore used is D, the red soil nickel ore in sintering mineral aggregate is that 9.2%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 13.
Example 16: red soil nickel ore used is D, the red soil nickel ore in sintering mineral aggregate is that 6.1%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 15.
Example 17: red soil nickel ore used is E, it is 16% of red soil nickel ore weight that premix is processed the slag amount of allocating into, and the unslaked lime amount of allocating into is 13% of red soil nickel ore weight, and the blast furnace gravitational dust amount of allocating into is 1.6% of red soil nickel ore weight.The magnesium slag amount of allocating into is 10% of red soil nickel ore weight.Red soil nickel ore in sintering mineral aggregate is that 6.7%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 18: red soil nickel ore used is E, the red soil nickel ore in sintering mineral aggregate is that 4.8%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 17.
Example 19: red soil nickel ore used is E, the red soil nickel ore in sintering mineral aggregate is that 6.7%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 17.
Example 20: red soil nickel ore used is E, the red soil nickel ore in sintering mineral aggregate is that 4.8%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 19.
Example 21: red soil nickel ore used is F, it is 25% of red soil nickel ore weight that premix is processed the slag amount of allocating into, and the unslaked lime amount of allocating into is 12% of red soil nickel ore weight, and the blast furnace gravitational dust amount of allocating into is 2.5% of red soil nickel ore weight.The magnesium slag amount of allocating into is 0.Red soil nickel ore in sintering mineral aggregate is that 6.3%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 22: red soil nickel ore used is F, the red soil nickel ore in sintering mineral aggregate is that 4.6%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 21.
Example 23: red soil nickel ore used is F, the red soil nickel ore in sintering mineral aggregate is that 6.3%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 22.
Example 24: red soil nickel ore used is F, the red soil nickel ore in sintering mineral aggregate is that 4.6%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 23.
Example 25: red soil nickel ore used is G, it is 20% of red soil nickel ore weight that premix is processed the slag amount of allocating into, and the unslaked lime amount of allocating into is 10% of red soil nickel ore weight, and the blast furnace gravitational dust amount of allocating into is 2% of red soil nickel ore weight.The magnesium slag amount of allocating into is 5%.Red soil nickel ore in sintering mineral aggregate is that 6.3%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 26: red soil nickel ore used is G, the red soil nickel ore in sintering mineral aggregate is that 4.6%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 25.
Example 27: red soil nickel ore used is G, the red soil nickel ore in sintering mineral aggregate is that 3.7%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 26.
Example 28: red soil nickel ore used is G, the red soil nickel ore in sintering mineral aggregate is that 4.8%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 27.
Example 29: red soil nickel ore used is H, it is 20% of red soil nickel ore weight that premix is processed the slag amount of allocating into, and the unslaked lime amount of allocating into is 0, and the blast furnace gravitational dust amount of allocating into is 2% of red soil nickel ore weight, and the magnesium slag amount of allocating into is 0.Red soil nickel ore in sintering mineral aggregate is that 3.2%Wt allocates in butt ratio.All the other operation major control methods are all identical with example 1.
Example 30: red soil nickel ore used is H, the red soil nickel ore in sintering mineral aggregate is that 3.2%Wt allocates in butt ratio.Sinter basicity is controlled by 2.1%, and entering blast furnace iron ore material is 3:7 by agglomerate with the ratio of pellet.All the other operation major control methods are all identical with example 29.
The red soil nickel ore ore proportioning rate that each is routine and sintering process parameter are as table 4.Each routine agglomerate index is as table 5.Each example enters in furnace charge agglomerate and accounts in iron charge ratio, comprehensive feed grade and gained molten iron nickel, chromium residual element content, the molten steel nickel after converter smelting, chromium residual element as table 6.The weathering steel composition that each example is produced and nickel metal, Chrome metal powder saving amount are as table 7.
The component of 8 kinds of red soil nickel ores of table 1
Note: in table 1, classify the main ingredient index in each mineral aggregate as, the component of row is not oxygen and inevitable impurity.
The pellet composition that table 2 is allocated various iron ore materials, fuel, the solvent of agglomerate into and allocated blast furnace into
Note: in table 2, classify the main component index in each material as, row composition is not oxygen, moisture and inevitable impurity.
Table 3 pair red soil nickel ore premix sieves pretreated parameter
Table 4 red soil nickel ore ore proportioning rate and sintering process parameter
The quality index of each routine agglomerate of table 5
Table 6 enter blast furnace index, blast-melted and bessemerize after molten steel in have valency residual element content value
Composition example and the alloy saving amount of each example weathering steel that refines of table 7
Claims (7)
1. utilize low grade nickel ore to produce a method for weather resisting steel, it is characterized in that: the technical parameter of processing step and control is as follows:
(1) join ore deposit
With above-mentioned iron ore meal and iron ore extract powder, red soil nickel ore, bessemer furnace slag, steel mill's internal recycle ferric charge, unslaked lime, limestone powder, magnesium slag, coke powder, carry out agglomerate and join ore deposit; The whole red soil nickel ores that add account for the butt ratio that agglomerate is all joined ore deposit raw material, are 2.5~9.9% by weight percentage;
The whole bessemer furnace slags that add, comprise red soil nickel ore are carried out to the bessemer furnace slag that premix adds, and the butt ratio that its total amount accounts for the whole raw materials of agglomerate is 1~2% by weight percentage;
The components based on weight percentage of gained agglomerate is:
TFe:52.0~55.5%, SiO
2: 5.2%~6.2%, CaO:8.8~13.0%, MgO:2.6~3.8%, AL
2o
3: 1.3~3.1%, Ni:0.030%~0.15%, Cr:0~0.25%; All the other are oxygen and inevitable impurity; Dual alkalinity CaO/SiO
2: 1.7~2.2, FeO Content in Sinter is controlled by 7%~9.5% weight percent;
(2) screening of the premix of red soil nickel ore is processed
The working method of premix is, to for 10%~50% slag of red soil nickel ore weight with for 5%~30% unslaked lime and red soil nickel ore of red soil nickel ore weight, puddle by weight, can be incorporated as simultaneously red soil nickel ore weight 0~10% magnesium slag, be that 0~15% blast furnace gravitational dust of red soil nickel ore weight is puddled together with red soil nickel ore; To in 120 hours, complete screening, sieve out the premix red soil nickel ore that granularity is less than 8mm standby; Premix red soil nickel ore after screening was transported into sinter machine feed bin for SINTERING PRODUCTION in 18 hours;
(3) sintering process is controlled
By agglomerate butt raw material, allocating carbon amount into is that 3.5~4.8%Wt adds coke powder and coal dust, by total moisture in compound, is 12~16% to control moisture additions, at the pelletizing unit of puddling of sinter machine, mixes each raw material pelletizing;
Evenly complete backing material, backing material thickness 20~40mm, then by the even cloth of compound on backing material; Bed thickness is determined according to sinter machine situation, 1100~1270 ℃ of ignition temperatures; Air quantity 80~120m
3/ m
2.min, 200~450 ℃ of sintering end point temperature, 80~150 ℃ of spent air tempertures;
The agglomerate burning till through cooling, broken, screening after, be directly transported into blast furnace or land standby;
(4) ironmaking iron charge proportioning
Agglomerate after screening and high-grade pelletizing+lump ore, 65%~82% the ratio that accounts for iron ore material according to agglomerate packs blast furnace ironmaking into; Comprehensive feed grade by weight percentage, is TFe >=55%, enters ratio Ni/Fe:0.04%~0.20% of Ni in furnace charge and the weight of Fe, enters ratio Cr/Fe:0~0.35% of Cr in furnace charge and the weight of Fe;
(5) ironmaking; In gained molten iron, the content of nickel is 0.04%~0.20% by weight percentage, and the content of chromium is 0~0.35% by weight percentage;
(6) steel-making
The molten iron that step (5) is produced supplies top blast or top and bottom combined blown converter smelting molten steel after desulfurization pre-treatment, or directly supplies top blast or top and bottom combined blown converter smelting molten steel.
2. method according to claim 1, is characterized in that: the red soil nickel ore raw material using is powdery red soil nickel ore, and butt components based on weight percentage is:
TFe:26%~53%, SiO
2: 2.6%~30%, CaO:0~2%, MgO:0~13.5%, AL
2o
3: 3~15%, Ni:0.6~2.5%, Cr:0~4.0%, S:0.02~0.15%, P:0.001~0.05%, TiO
2: 0~0.5%; All the other are oxygen and other inevitable impurity;
Or, nickeliferous low low-grade laterite nickel ore, butt components based on weight percentage is:
TFe:42%~53%, SiO
2: 2.6%~5%, CaO:0~2%, MgO:0~2%, AL
2o
3: 3~15%, Ni:0.6~1.2%, Cr:0.5~4.0%, S:0.02~0.15%, P:0.001~0.05%, TiO
2: 0~0.5%; All the other are oxygen and other inevitable impurity;
Contained humidity is 18%~45% by weight percentage.
3. method according to claim 1, is characterized in that: the bessemer furnace slag raw material butt components based on weight percentage of using is:
TFe:22%~40%, SiO
2: 5%~15%, CaO:30~40%, MgO:2~12%, AL
2o
3: 2~4%, all the other are oxygen and other inevitable impurity.Contained humidity is 0~9%.
4. method according to claim 1, is characterized in that: other join mining iron ore raw material:
Butt iron content is 56~71% iron ore meal and iron ore extract powder by weight percentage.
5. method according to claim 1, is characterized in that: other internal recycle iron ore raw materials:
Butt iron content is 54~58% return mine by weight percentage; Butt iron content is 35~50% blast furnace gravitational dust collection ash by weight percentage; Butt iron content is steel mill's circulation depositing in water mud of 48~52% by weight percentage.
6. method according to claim 1, is characterized in that: Iron Ore Matching in Sintering auxiliary material:
Unslaked lime: containing CaO >=75%, and more high better; Limestone powder: containing CaO >=48%, and more high better; Magnesium slag: MgO >=40%;
Coke powder: impurity≤15% beyond butt C.
7. method according to claim 1, is characterized in that: pellet and lump ore for ironmaking:
TFe content by weight percentage >=61%, best >=63%, more high better.SiO
2: 4.5~6.5%; Other are oxygen and inevitable impurity.
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CN104911288A (en) * | 2015-04-14 | 2015-09-16 | 四川金广实业(集团)股份有限公司 | Blast furnace smelting laterite nickel ore method to reduce magnesium oxide content in slag |
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CN112143850A (en) * | 2019-06-28 | 2020-12-29 | 张家港宏昌钢板有限公司 | Sintered ore for electric furnace washing of smelting cord steel and furnace washing method thereof |
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CN113249566A (en) * | 2021-03-03 | 2021-08-13 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
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