CN105880584A - Method for preparing qualified microalloy iron powder through high-hydrogen-loss high-carbon primary reduced iron powder - Google Patents
Method for preparing qualified microalloy iron powder through high-hydrogen-loss high-carbon primary reduced iron powder Download PDFInfo
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- CN105880584A CN105880584A CN201610244541.8A CN201610244541A CN105880584A CN 105880584 A CN105880584 A CN 105880584A CN 201610244541 A CN201610244541 A CN 201610244541A CN 105880584 A CN105880584 A CN 105880584A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
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Abstract
The invention discloses a method for preparing qualified microalloy iron powder through high-hydrogen-loss high-carbon primary reduced iron powder. The high-hydrogen-loss high-carbon primary reduced iron powder is heated and dried, the balanced and stable distribution amount, the agglomeration grain and the surface flatness and smoothness are controlled, the iron powder is fed into a secondary refining reduction steel belt furnace for refining reduction, and the temperatures of 1-10 deoxygenation zones and decarburization zones are adjusted from low to high according to the decarburization and deoxygenation effects; and iron blocks at a secondary refining reduction outlet are crushed, and the qualified microalloy iron powder is obtained through a conventional classifying screen. Preparation of the microalloy iron powder through Panxi vanadium titano-magnetite with abundant resources and relatively low price is achieved, the preparation cost of the microalloy iron powder is remarkably reduced, and the dependence on high-stability high-quality concentrate fines for preparing high-quality iron powder is greatly lowered. The utilization rate of the abundant Panxi vanadium titano-magnetite resource with stable quality and the relatively low price is effectively increased, and the microalloy iron powder which is rich in various alloying elements and good in performance is obtained.
Description
Technical field
The present invention relates to a kind of method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon, belong to
Direct-reduction iron powder manufacturing technology field.
Background technology
In terms of iron ore resource, Panxi Diqu vanadium titano-magnetite aboundresources, existing explored vanadium titano-magnetite distant view storage
Amount more than 10,000,000,000 tons, reserves is 67.3 hundred million tons, not only enormous amount, stay in grade, and vanadium titano-magnetite be with iron,
Vanadium, titanium elements are main, and with the Pluralistic and semiotiC iron ore of other multiple elements such as cobalt, nickel, scandium, gallium.From the utilization of resources and improvement
Product performance sets out, and this just makes to make full use of v-ti magnetite ore resources and alloying element improves iron powder product performance component requirements
From the point of view of have extremely reality meaning.
Current domestic employing sefstromite concentrate produces being mainly of reduced iron powder: application TFe content low (52～60%)
Climb western vanadium titano-magnetite with solid reductant (coke powder or blending 10～the anthracite of 15% pulverized limestone) mutually not mix
During laminar fills in fire-resistant jar between Heing, in tunnel cave, then it is heated to 1050～1100 DEG C, after long-time reduction
It is cooled to about 200 DEG C taking-ups and unloads tank, through pulverizing grinder choosing and the iron sponge powder decomposed ammonia that obtained after drying heat-resisting
Carry out reduced anneal (annealing temperature is 800～900 DEG C) in steel band type stove and acquire high TFe content (>98.5%), C<
0.025%, solid solution has natural micro-conjunction of excellent quality of the multiple elements such as vanadium (V), titanium (Ti), cobalt (Co), nickel (Ni), chromium (Cr)
Gold iron powder.
In reduced iron powder enterprise production process, more than the 80% of the high-quality feedstocks cost full cost of xanthenes material, with domestic
Concentrate deficient, the super purification cost of high-quality ore and riseing of freight so that reduced iron powder competitiveness day by day declines, in
High-end iron powder market is again by occupied by external iron powder.Therefore, developing uses aboundresources, cheap and rich in alloying element
Climb western v-ti magnetite ore resources, and reduce iron powder preparation cost, play micro alloy iron powder excellent properties and be finally reached part
Substituting import one reduced iron powder, deep process technology product follow-up to iron powder plays excellent support, for strengthening Powder Metallurgy Enterprise city
Field competitiveness is most important.
Owing to utilizing, to climb process links qualifying point during western vanadium titano-magnetite prepares micro alloy iron powder many, flow process:
Climb western vanadium titano-magnetite+in join carbon+Nacl → compound+limit coal+agstone → long-time heating, temperature keeping catalysis reduction →
Three grades of mill ore magnetic selection → dehydration → dry → secondary reduction steel belt furnace → crushing and screening → conjunction batch finished products.Entering secondary reduction steel
Band stokehold have passed through six road treatment process, and often changes through a procedure, material quality and stability, all can be to next
Procedure operating parameter, intermediate products quality produce significant impact.Especially, catalysis reduction phase, the distribution of temperature spot, guarantor
Temperature time length, gas pressure, quality etc. change and all can make a reduced iron powder composition and quality great changes will take place, continue
And affect the adjustment of subsequent handling lectotype selection and operating parameter.
Therefore, system research and development utilize aboundresources, cheap and containing multiple alloying element climb western vanadium titano-magnetite
As waste height TFe content (>98.5%), low C content (<0.025%), HL<0.30% and solid solution have vanadium (V), titanium (Ti),
The preparation method of the micro alloy iron powder of the multiple alloying element excellent quality such as cobalt (Co), nickel (Ni), is to solve current domestic reduction
One of important channel that the competitiveness such as iron powder is with high costs, performance is the best are the strongest.But due to climb western vanadium titano-magnetite ore deposit grade low,
Silica and other gangue content content are high, and have brought more chlorine element in catalytic reduction process into；Simultaneously because vanadium
Titanomagnetite is changed by gas pressure, calorific value, temperature province distribution and temperature retention time at catalysis reduction phase, can affect iron ore
Stone reducing degree and the growth of iron crystal grain and growth process, iron powder quality component of micro alloy iron powder raw material can be produced by this
Significant impact.Especially, it is easy to cause a hydrogen loss of powdered iron and the higher situation of carbon content.
Therefore, produce qualified micro alloy iron powder with iron powder of high hydrogen loss high-carbon, enter the reduction of secondary reduction steel belt furnace essence
Time, reduction process can be caused unstable, decarburization deoxidation effectiveness reduces, and not only causes secondary iron powder iron content and hydrogen loss, oxygen
Content fluctuation is big, can cause steel belt furnace iron powder bonding steel band phenomenon because satisfied removing oxygen element needs promote reduction temperature simultaneously,
This further deteriorates secondary reduction atmosphere and effect, even makes the steel band life-span be greatly decreased.Processing steel band can be because of heating and cooling
Promote the electricity charge to be substantially increased, and because affecting whole rhythm of production and Qualified Products Rate can be caused to significantly reduce.Above-mentioned
All is all to cause the steel belt furnace essence reduction process working of a furnace factors of instability, makes steel belt furnace reduction process be difficult to stable carrying out, produces
Quality can not be guaranteed, and makes increase yield, reduces processing charges difficulty, can refer to because of product quality deterioration, qualification rate reduction etc.
Mark deterioration causes cost significantly to rise.
Thus scale uses iron powder of high hydrogen loss high-carbon content during steel belt furnace carries out secondary reduction to iron powder,
Utilize decomposed ammonia (3H2+1N2), and to produce qualified micro alloy iron powder by ordinary reduction iron powder customary preparation methods be extremely difficult
's.The common iron ore concentrate of existing utilization (extraction of superpure concentrate of magnetite), iron scale or the method producing qualified reduced iron powder with vanadium ilmenite concentrate, still
Set up the level that or hydrogen loss higher at overall feed grade, carbon content are relatively low, utilize hydrogen loss > 2.5%, carbon content > 0.65%
Iron powder and use the highest decomposed ammonia (volume ratio 3:1, the 3H of hydrogen purity2+1N2), carry out secondary reduction produce qualified
The method of microalloy powder, then there are no pertinent literature report.Changsha Mining & Metallurgy Inst uses and climbs western schreyerite resource, and also keeps
Relatively high ferro mealiness energy and preferable technical-economic index, but in its iron powder, hydrogen loss and carbon content be 2.5%, less than 0.65%,
And one time iron powder source resource is the most firm, composition stable performance, and harmful element is relatively low.Though other PRODUCTION OF IRON POWDER enterprise iron powders
Have certain characteristic, but its great majority still fall within use extraction of superpure concentrate of magnetite powder or iron scale produces reduced iron powder, and belong to common
The category of iron powder.From the point of view of steel belt furnace is used in an iron powder entirety, hydrogen loss and carbon content is relatively low, stability is strong, Resource Dependence
Property is higher, and fails to embody micro alloy iron powder rich in features such as multiple alloying elements.Therefore, it is necessary to research and development can at secondary fine also
In former steel belt furnace, scale uses iron powder of high hydrogen loss high-carbon content and the highest decomposed ammonia (3H of hydrogen purity2+1N2), produce
Go out the new method of qualified micro alloy iron powder.
Summary of the invention
It is an object of the invention to provide one can be in reduced iron powder secondary reduction, it is possible to the scale high hydrogen loss of use,
An iron powder that carbon content is high and use the decomposed ammonia (3H that hydrogen purity is the highest2+1N2), and have and necessarily produce intensity, energy
Keeping steel belt furnace working of a furnace long period stable smooth operation, the method finally producing qualified micro alloy iron powder, expanding aboundresources
The most relatively inexpensive much climb western vanadium titano-magnetite resource utilization, and obtain rich in multiple alloying element, excellent performance micro-
Alloy iron powder.
The present invention is realized by following technical proposal: an a kind of reduced iron powder with high hydrogen loss high-carbon produces qualified micro-conjunction
The method of gold iron powder, through the following step:
A, by heated for a reduced iron powder (aqueous 10～15%) of high hydrogen loss high-carbon be dried to temperature be 60～75 DEG C, aqueous
Amount < 0.19%, carbon-to-oxygen ratio 0.25～0.33, and control cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth, and
Sending into and carry out essence reduction in secondary reduction steel belt furnace, controlling parameter is:
Bed of material width 860～900mm, thickness 25～28mm, belt speed 120～160mm/min；The flow entering stove decomposed ammonia is 28
～36m3/ h, the flow of stove tail protection nitrogen is 12～15m3/h；Making the pressure of decomposed ammonia in stove is 0.05～0.08MPa, protects
The pressure protecting nitrogen is 0.50～0.70MPa；1～10 deoxidation, decarburization district is regulated from low to high depending on decarburization and deoxidation effect
Temperature is 720～900 DEG C；Slow-cooling-zone temperature is 140～180 DEG C；
B, the secondary reduction of step A is exported iron block pulverize, and through conventional classifying screen, obtain 200～325 purposes qualified
Micro alloy iron powder.In gained micro alloy iron powderw(TFe)-w(MFe) content 0.50～0.80%.
Being mainly composed of of reduced iron powder of the high hydrogen loss high-carbon of described step A: TFe 95.5～96.5wt%, MFe
86.0～88.0 wt %, HL 2.50～3.0 wt %, C 0.65～0.85 wt %.
Reduced iron powder of described high hydrogen loss high-carbon is by low-grade vanadium titano-magnetite with popular smokeless coal in mass ratio
After being 55～57:12～15 mixing, add Nacl after the Conventional catalytic of 1040～1080 DEG C, insulation 32～36h reduces
Mill choosing is isolated.
The chemical composition of described low-grade vanadium titano-magnetite is: TFe 55～58 wt%, SiO22.26～4.45 wt %,
Al2O32.32～3.73 wt %, TiO26.61～6.86 wt %, V2O50.70～0.79 wt %, S 0.076～0.120
Wt %, FeO 22.79～24.23 wt %.
The chemical composition of described popular smokeless coal is: Ash 13.46～14.80 wt %, V 7.70～9.20 wt %, S
0.43～0.80 wt %, fixing C content 76.23～77.36 wt %.
Described Nacl chemical composition is: NaCl 99.0～99.3 wt %, KCl 0.015～0.025 wt %, MgCl2
0.015～0.025 wt %, CaCl 0.015～0.025 wt %, CaSO40.10～0.25 wt %, SiO20.015～
0.025 wt %。
The decomposed ammonia of described step A is H2And N2It is the mixed gas of 3:1 by volume.
The purity of the protection nitrogen of described step A is 99.95～99.99%.
Described step A depending on decarburization and deoxidation effect refer to carbon-drop rate be less than 90%, DNA vaccine less than 85% time at temperature model
Enclose and in 720～900 DEG C, regulate 1～10 deoxidation, the temperature in decarburization district from low to high.
The present invention prepares basic theory based on reduced iron powder, utilizes hydrogen, carbon reduction thermodynamics and principle of dynamics, in conjunction with
Reduced iron powder secondary reduction stove actual process parameter and control, make secondary reduction stove not only achieve aboundresources and valency
The lattice relative moderate micro alloy iron powder of preparing climbing western vanadium titano-magnetite much, and effectively lift technique economic indicator, significantly drop
Low micro alloy iron powder manufacturing cost, the scale that reduces largely uses catalysis reduction when climbing western v-ti magnetite ore resources to produce
High hydrogen loss, the high iron powder of carbon content and use the decomposed ammonia (3H that hydrogen purity is the highest2+1N2To secondary reduction after)
The adverse effect that stove produces, makes the secondary reduction stove working of a furnace realize necessarily producing intensity, and long period stable smooth operation, significantly
Reduce the dependence to high stability phosphorus concentrate powder when preparing high-quality iron powder, it is suppressed that hydrogen loss of powdered iron rising, a high-carbon
Content on micro alloy iron powder chemical composition, physicochemical property affect amplitude, make micro alloy iron powder iron content and carbon, hydrogen loss etc. main
Target improvement is stable, and not only yield increased, and comprehensive manufacturing cost is remarkably decreased.Effectively expand aboundresources, quality
Stable and price relatively inexpensive much climb western vanadium titano-magnetite resource utilization, and obtain rich in multiple alloying element, property
The micro alloy iron powder that energy is excellent.
The present invention is compared with existing reduced iron powder and alloyed iron powder, preparation method thereof, and common process becomes dtex to an iron powder
Point specific aim is not strong, and product quality indicator is poor, and unstable, it will be apparent that have,w(TFe)-w(MFe) content difference > 1.0%(says
Bright reduction is the best),w(C) easily occur 0.030% upper limit case,w(HL) easily occur 0.30% upper limit case；Become present aspect, pure hydrogen
Price is 10 times of decomposed ammonia, only this item, and ton iron powder preparation cost just difference 600～700 yuan/ton, additionally, use pure hydrogen
Security risk increases.And the present invention is under entirely climbing western vanadium titano-magnetite resources supplIes, eliminate the reliance on high-quality super concentrate resource,
Scale uses to utilize and climbs high hydrogen loss, the high iron powder of carbon content that the catalysis reduction of western v-ti magnetite ore resources produces and use hydrogen
Decomposed ammonia (the 3H that gas purity is the highest2+1N2), break through and existing utilize extraction of superpure concentrate of magnetite (TFe > 70%) or iron scale and utilize vanadium
Traditional iron powder preparation mode of the PRODUCTION OF IRON POWDER alloy iron powder of low-carbon (LC) hypoxemia type that titanomagnetite produces.At secondary reduction stove
Averagely enter iron powder TFe 95.5 ~ 96.5% of stove, during MFe 86.0 ~ 91.0%, HL 2.50 ~ 3.0%, C 0.65 ~ 0.85%, two
The secondary fine reduction furnace working of a furnace keeps necessarily producing intensity, it is achieved working of a furnace stable smooth operation, the micro alloy iron powder of preparationw(TFe) break through
99.0%,w(C) < 0.025%,w(HL) < 0.30%, yield increased, and power consumption and liquefied ammonia consumption are stable.Effectively expand money
Source is abundant, steady quality and relatively inexpensive the climbing western vanadium titano-magnetite resource utilization and utilizing hydrogen purity not much of price
High decomposed ammonia (3H2+1N2), the micro alloy iron powder physical and chemical index rich in multiple alloying element produced is preferable, and, micro-
Alloy iron powder manufacturing cost reduces more than 1000 yuan/ton.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
After low-grade vanadium titano-magnetite being mixed for 55.65:13 in mass ratio with popular smokeless coal, add Nacl 1060
DEG C, after the Conventional catalytic reduction of insulation 33h mill choosing be isolated a reduced iron powder of high hydrogen loss high-carbon (mill select separation process
For: broken → mill ore magnetic selection (repeating for three times) → dehydration → be dried → classification → iron powder of high hydrogen loss high-carbon).
Wherein, the chemical composition of low-grade vanadium titano-magnetite is: TFe 55.65%, SiO24.45%, Al2O33.73%,
TiO26.86%, V2O50.79%, S 0.120%, FeO 24.23%；The chemical composition of popular smokeless coal is: Ash 14.80%, V
9.20%, S 0.80%, fixing C content 77.36%, fineness 60 mesh；Nacl chemical composition is: NaCl 99.3%, KCl
0.025%, MgCl20.025%, CaCl 0.025%, CaSO40.25%, SiO2 0.025%。
Being mainly composed of of reduced iron powder of gained high hydrogen loss high-carbon: TFe 95.53%, MFe 86.2%, HL
2.85%, C 0.795%.
A, by heated for a reduced iron powder (aqueous 15%) of above-mentioned high hydrogen loss high-carbon be dried to temperature be 70 DEG C, aqueous
Amount < 0.19%, carbon-to-oxygen ratio 0.279, and control cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth, and send into two
Carrying out essence reduction in secondary essence reduction steel belt furnace, controlling parameter is:
Bed of material width 900mm, thickness 26mm, belt speed 145mm/min；Enter stove decomposed ammonia (H2And N2It is the mixed of 3:1 by volume
Close gas) flow be 32m3/ h, the flow of stove tail protection nitrogen (purity is 99.95～99.99%) is 12～15m3/h；Make stove
The pressure of interior decomposed ammonia is 0.065MPa, and the pressure of protection nitrogen is 0.65MPa；10 deoxidations, decarburization district temperature are respectively
720℃、750℃、780℃、800℃、850℃、850℃、870℃、870℃、880℃、860℃；Slow-cooling-zone temperature is 162
℃；
B, the secondary reduction of step A is exported iron block pulverize, and through conventional classifying screen, obtain qualified (-200 mesh ~ 325
Mesh) micro alloy iron powder.
In gained micro alloy iron powderw(TFe) 98.55%,w(C) 0.020%,w(HL) 0.30%,w(TFe)-w(MFe) content
Difference 0.80%, carbon removal efficiency 97.48%, oxygen removal rate 89.47%, do not affect working of a furnace stable smooth operation and technical-economic index.
Embodiment 2
After low-grade vanadium titano-magnetite is mixed for 55:12 in mass ratio with popular smokeless coal, add Nacl 1040 DEG C,
After the Conventional catalytic reduction of insulation 36h mill choosing be isolated high hydrogen loss high-carbon a reduced iron powder (mill selects the separation process to be:
Broken → mill ore magnetic selection (repeating for three times) → dehydration → be dried → classification → iron powder of high hydrogen loss high-carbon).
Wherein, the chemical composition of low-grade vanadium titano-magnetite is: TFe 54.93%, SiO24.87%, Al2O33.79%,
TiO27.03%, V2O50.76%, S 0.126%, FeO 22.63%；The chemical composition of popular smokeless coal is: Ash 15.67%, V
9.55%, S 0.86%, fixing C content 75.88%, fineness 60 mesh；Nacl chemical composition is: NaCl 99.2%, KCl
0.028%, MgCl20.022%, CaCl 0.031%, CaSO40.27%, SiO2 0.020%。
Being mainly composed of of reduced iron powder of gained high hydrogen loss high-carbon: TFe 95.22%, MFe 86.0%, HL
3.05%, C 0.805%.
A, by heated for a reduced iron powder (aqueous 13%) of above-mentioned high hydrogen loss high-carbon be dried to temperature be 60 DEG C, aqueous
Amount < 0.19%, carbon-to-oxygen ratio 0.264, and control cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth, and send into two
Carrying out essence reduction in secondary essence reduction steel belt furnace, controlling parameter is:
Bed of material width 890mm, thickness 25mm, belt speed 120mm/min；Enter stove decomposed ammonia (H2And N2It is the mixed of 3:1 by volume
Close gas) flow be 28m3/ h, the flow of stove tail protection nitrogen (purity is 99.95～99.99%) is 14m3/h；Make ammonia in stove
The pressure of decomposition gas is 0.05MPa, and the pressure of protection nitrogen is 0.70MPa；10 deoxidations, decarburization district temperature be respectively 750 DEG C,
780℃、800℃、830℃、860℃、860℃、870℃、880℃、880℃、860℃；Slow-cooling-zone temperature is 169 DEG C；
B, the secondary reduction of step A is exported iron block pulverize, and through conventional classifying screen, obtain qualified (-200 mesh ~ 325
Mesh) micro alloy iron powder.
In gained micro alloy iron powderw(TFe) 98.52%,w(C) 0.022%,w(HL) 0.29%,w(TFe)-w(MFe) content
Difference 0.78%, carbon removal efficiency 97.27%, oxygen removal rate 90.49%, do not affect working of a furnace stable smooth operation and technical-economic index.
Embodiment 3
After low-grade vanadium titano-magnetite being mixed for 57:15 in mass ratio with popular smokeless coal, add Nacl 1080
DEG C, after the Conventional catalytic reduction of insulation 32h mill choosing be isolated a reduced iron powder of high hydrogen loss high-carbon (mill select separation process
For: broken → mill ore magnetic selection (repeating for three times) → dehydration → be dried → classification → iron powder of high hydrogen loss high-carbon).
Wherein, the chemical composition of low-grade vanadium titano-magnetite is: TFe 55.93%, SiO24.47%, Al2O33.39%,
TiO26.63%, V2O50.71%, S 0.116%, FeO 23.85%；The chemical composition of popular smokeless coal is: Ash 15.25%, V
8.98%, S 0.86, fixing C content 76.01%, fineness 60 mesh；Nacl chemical composition is: NaCl 99.32%, KCl
0.033%, MgCl20.021%, CaCl 0.029%, CaSO40.23%, SiO2 0.022%。
Being mainly composed of of reduced iron powder of gained high hydrogen loss high-carbon: TFe 95.46%, MFe 87.06%, HL
2.58%, C 0.696%.
A, by heated for a reduced iron powder (aqueous 11%) of above-mentioned high hydrogen loss high-carbon be dried to temperature be 75 DEG C, aqueous
Amount < 0.19%, carbon-to-oxygen ratio 0.270, and control cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth, and send into two
Carrying out essence reduction in secondary essence reduction steel belt furnace, controlling parameter is:
Bed of material width 860mm, thickness 28mm, belt speed 160mm/min；Enter stove decomposed ammonia (H2And N2It is the mixed of 3:1 by volume
Close gas) flow be 36m3/ h, the flow of stove tail protection nitrogen (purity is 99.95～99.99%) is 12m3/h；Make ammonia in stove
The pressure of decomposition gas is 0.08MPa, and the pressure of protection nitrogen is 0.50MPa；10 deoxidations, decarburization district temperature be respectively 760 DEG C,
800℃、820℃、850℃、850℃、850℃、870℃、870℃、870℃、860℃；Slow-cooling-zone temperature is 180 DEG C；
B, the secondary reduction of step A is exported iron block pulverize, and through conventional classifying screen, obtain qualified (-200 mesh ~ 325
Mesh) micro alloy iron powder.
In gained micro alloy iron powderw(TFe) 98.85%,w(C) 0.016%,w(HL) 0.25%,w(TFe)-w(MFe) content
Difference 0.69%, carbon removal efficiency 97.70%, oxygen removal rate 90.31%, do not affect working of a furnace stable smooth operation and technical-economic index.
Claims (9)
1. the method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon, it is characterised in that under Jing Guo
Row step:
A, by heated for a reduced iron powder of high hydrogen loss high-carbon be dried to temperature be 60～75 DEG C, water content < 0.19%, carbon oxygen
Ratio 0.25～0.33, and control cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth, and send into secondary reduction
Carrying out essence reduction in steel belt furnace, controlling parameter is:
Bed of material width 860～900mm, thickness 25～28mm, belt speed 120～160mm/min；The flow entering stove decomposed ammonia is 28
～36m3/ h, the flow of stove tail protection nitrogen is 12～15m3/h；Making the pressure of decomposed ammonia in stove is 0.05～0.08MPa, protects
The pressure protecting nitrogen is 0.50～0.70MPa；1～10 deoxidation, decarburization district is regulated from low to high depending on decarburization and deoxidation effect
Temperature is 720～900 DEG C；Slow-cooling-zone temperature is 140～180 DEG C；
B, the secondary reduction of step A is exported iron block pulverize, and through conventional classifying screen, obtain 200～325 purposes qualified
Micro alloy iron powder.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 1,
It is characterized in that: being mainly composed of of a reduced iron powder of the high hydrogen loss high-carbon of described step A: TFe 95.5～96.5wt%,
MFe 86.0～88.0 wt %, HL 2.50～3.0 wt %, C 0.65～0.85 wt %.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 2,
It is characterized in that: a reduced iron powder of described high hydrogen loss high-carbon is by quality by low-grade vanadium titano-magnetite and popular smokeless coal
After being 55～57:12～15 mixing, add Nacl 1040～1080 DEG C, the Conventional catalytic reduction of insulation 32～36h
Rear mill choosing is isolated.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 3,
It is characterized in that: the chemical composition of described low-grade vanadium titano-magnetite is: TFe 55～58 wt%, SiO22.26～4.45 wt
%, Al2O32.32～3.73 wt %, TiO26.61～6.86 wt %, V2O50.70～0.79 wt %, S 0.076～
0.120 wt %, FeO 22.79～24.23 wt %.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 3,
It is characterized in that: the chemical composition of described popular smokeless coal is: Ash 13.46～14.80 wt %, V 7.70～9.20 wt
%, S 0.43～0.80 wt %, fixing C content 76.23～77.36 wt %.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 3,
It is characterized in that: described Nacl chemical composition is: NaCl 99.0～99.3 wt %, KCl 0.015～0.025 wt %,
MgCl20.015～0.025 wt %, CaCl 0.015～0.025 wt %, CaSO40.10～0.25 wt %, SiO20.015
～0.025 wt %.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 1,
It is characterized in that: the decomposed ammonia of described step A is H2And N2It is the mixed gas of 3:1 by volume.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 1,
It is characterized in that: the purity of the protection nitrogen of described step A is 99.95～99.99%.
The method producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon the most according to claim 1,
It is characterized in that: described step A depending on decarburization and deoxidation effect refer to carbon-drop rate be less than 90%, DNA vaccine less than 85% time in temperature
1～10 deoxidation, the temperature in decarburization district is regulated from low to high in scope 720～900 DEG C.
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| CN110947978A (en) * | 2019-12-16 | 2020-04-03 | 兰州有色冶金设计研究院有限公司 | Method for producing reduced iron powder by using refined iron powder in two stages |
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