CN105880584B - The method for producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon - Google Patents
The method for producing qualified micro alloy iron powder with a reduced iron powder of high hydrogen loss high-carbon Download PDFInfo
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- CN105880584B CN105880584B CN201610244541.8A CN201610244541A CN105880584B CN 105880584 B CN105880584 B CN 105880584B CN 201610244541 A CN201610244541 A CN 201610244541A CN 105880584 B CN105880584 B CN 105880584B
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
Abstract
The present invention discloses a kind of method that a reduced iron powder with high hydrogen loss high-carbon produces qualified micro alloy iron powder, by a heated drying of reduced iron powder of high hydrogen loss high-carbon, and control cloth doses equalization stable, conglomeration granularity, charge level flat smooth, and be sent into secondary reduction steel belt furnace and carry out smart reduction, depending on decarburization and deoxidation effect adjust from low to high 1~10 deoxidation, decarburization area temperature；Then secondary reduction outlet iron block is crushed, and through conventional classifying screen to get qualified micro alloy iron powder.The present invention only realize resourceful and relative low price much climb western vanadium titano-magnetite prepare micro alloy iron powder, significantly reduce micro alloy iron powder manufacturing cost, significantly reduce when preparing high-quality iron powder to the dependence of high stability phosphorus concentrate powder.Effectively expand resourceful, stable quality and price it is much relatively inexpensive climb western vanadium titano-magnetite resource utilization, and obtain rich in a variety of alloying elements, the micro alloy iron powder haveing excellent performance.
Description
Technical field
The present invention relates to a kind of methods that a reduced iron powder with high hydrogen loss high-carbon produces qualified micro alloy iron powder, belong to
It is reduced directly iron powder manufacturing technology field.
Background technology
In terms of iron ore resource, Panxi Diqu vanadium titano-magnetite is resourceful, existing explored vanadium titano-magnetite distant view storage
Amount more than 10,000,000,000 tons, reserves be 67.3 hundred million tons, not only enormous amount, stay in grade, and vanadium titano-magnetite be with iron,
Based on vanadium, titanium elements, 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 characteristic sets out, this just makes that v-ti magnetite ore resources and its alloying element is made full use of to improve iron powder product characteristic component requirements
From the point of view of there is extremely real meaning.
It is domestic at present to be mainly using what sefstromite concentrate produced reduced iron powder：It is low using TFe contents（52~60%）'s
Climb western vanadium titano-magnetite and solid reductant（Coke powder or the anthracite for blending 10~15% pulverized limestones）Not mix mutually
Laminar is loaded in fire resisting jar between closing, and 1050~1100 DEG C are then heated in tunnel oven, after long-time restores
It is cooled to 200 DEG C or so taking-ups and unloads tank, the iron sponge powder decomposed ammonia obtained after broken mill choosing and drying is heat-resisting
Reduced anneal is carried out in steel band type stove（Annealing temperature is 800~900 DEG C）Acquire high TFe contents (>98.5%), C<
0.025%, solid solution has natural micro- conjunction of the excellent qualities of multiple elements such as vanadium (V), titanium (Ti), cobalt (Co), nickel (Ni), chromium (Cr)
Golden iron powder.
In reduced iron powder enterprise production process, 80% or more of the full cost of high-quality feedstocks cost xanthenes material, with domestic
Deficient, the super concentrate purification cost of high-quality ore and riseing for freight so that reduced iron powder competitiveness increasingly declines, in
High-end iron powder market is again occupied by external iron powder.Therefore, developing uses resourceful, cheap and is rich in alloying element
Climb western v-ti magnetite ore resources, and reduce iron powder manufacturing cost, play and micro alloy iron powder excellent properties and be finally reached part
Replace import reduced iron powder, excellent support is played to the follow-up deep process technology product of iron powder, for enhancing Powder Metallurgy Enterprise city
Field competitiveness is most important.
Due to more, the flow using process links qualifying point during western vanadium titano-magnetite prepares micro alloy iron powder is climbed：
Climb western vanadium titano-magnetite+interior with carbon+Nacl → mixture+side coal+agstone → long-time heating, temperature keeping catalysis reduction →
Three-level mill ore magnetic selection → dehydration → drying → secondary reduction steel belt furnace → crushing and screening → conjunction batch finished product.Entering secondary reduction steel
Band stokehold have passed through six treatment process, and often pass through a procedure, and material quality and stability change, can be to next
Procedure operating parameter, intermediate products quality generate significant impact.Especially, in catalysis reduction phase, the distribution of temperature spot is protected
Warm time length, gas pressure, quality etc. change and can all make a reduced iron powder ingredient and quality great changes will take place, after
And influence subsequent handling lectotype selection and the adjustment of operating parameter.
Therefore, system research and development is using resourceful, cheap and containing climbing western vanadium titano-magnetite there are many alloying element
As the high TFe contents of waste (>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 powders of a variety of alloying element excellent qualities such as cobalt (Co), nickel (Ni) is to solve domestic reduction at present
Not strong one of the important channel of the competitiveness such as iron powder is with high costs, performance is bad.But due to climb western vanadium titano-magnetite mine grade it is low,
Silica and other gangue content contents are high, and have brought more chlorine element into catalytic reduction process；Simultaneously because vanadium
Titanomagnetite is changed in catalysis reduction phase by gas pressure, calorific value, temperature region distribution and soaking time, and iron ore can be influenced
The development of stone reducing degree and iron crystal grain and growth process, this can generate a micro alloy iron powder raw material-time iron powder quality component
Significant impact.Especially, a hydrogen loss of powdered iron and the higher situation of carbon content are easily caused.
Therefore, qualified micro alloy iron powder is produced with iron powder of high hydrogen loss high-carbon, is restored into secondary reduction steel belt furnace essence
When, 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, while can bond steel band phenomenon by steel belt furnace iron powder caused by meeting removing oxygen element and needing to promote reduction temperature,
This further deteriorates secondary reduction atmosphere and effect, or even the steel band service life is made to be greatly decreased.Handling steel band can be because of heating and cooling
The electricity charge are promoted to be substantially increased, and can be because influencing entire rhythm of production and Qualified Products Rate being caused to significantly reduce.It is above-mentioned
Various is to cause the steel belt furnace essence reduction process working of a furnace factors of instability, and steel belt furnace reduction process is made to be difficult to stablize progress, production
Quality cannot be guaranteed, and make increase yield, reduce processing charges difficulty, can be because of fingers such as product quality deterioration, qualification rate reductions
Mark, which deteriorates, 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 it is extremely difficult to produce qualified micro alloy iron powder by ordinary reduction iron powder customary preparation methods
's.The common iron ore concentrate of existing utilization (extraction of superpure concentrate of magnetite), iron scale or the method for producing qualified reduced iron powder with vanadium ilmenite concentrate, still
It establishes whole feed grade is higher or the lower level of hydrogen loss, carbon content, utilizes hydrogen loss>2.5%, carbon content>0.65%
Iron powder and the decomposed ammonia (volume ratio 3 for using hydrogen purity not high:1,3H2+1N2), it carries out secondary reduction and produces qualification
The method of microalloy powder then there are no pertinent literature report.Western schreyerite resource is climbed in Changsha Mining ＆ Metallurgy Inst's use, and is also kept
Compared with high ferro mealiness can and preferable technical-economic index, but in its iron powder hydrogen loss and carbon content 2.5%, 0.65% hereinafter,
And an iron powder source resource is quite firm, and ingredient performance is stablized, and harmful element is relatively low.Though other PRODUCTION OF IRON POWDER enterprise iron powders
Have most of certain characteristic, but its to still fall within using extraction of superpure concentrate of magnetite powder or iron scale production reduced iron powder, and belongs to common
The scope of iron powder.Steel belt furnace use an iron powder on the whole for, hydrogen loss and carbon content is relatively low, stability is strong, Resource Dependence
Property it is higher, and fail to embody the features such as micro alloy iron powder is rich in a variety of alloying elements.Therefore, it is necessary to research and develop can secondary fine also
Scale uses the not high decomposed ammonia (3H of iron powder of high hydrogen loss high-carbon content and hydrogen purity in former steel belt furnace2+1N2), production
Go out the new method of qualified micro alloy iron powder.
Invention content
The purpose of the present invention is to provide it is a kind of can in reduced iron powder secondary reduction, can scale using high hydrogen loss,
A high iron powder of carbon content and the decomposed ammonia (3H for using hydrogen purity not high2+1N2), and with certain production intensity, energy
Keep steel belt furnace working of a furnace long period stable smooth operation, the method for finally producing qualified micro alloy iron powder, with expand it is resourceful and
It is again much relatively inexpensive to climb western vanadium titano-magnetite resource utilization, and obtain rich in a variety of alloying elements, have excellent performance it is 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 golden iron powder, by the following steps：
A, by a reduced iron powder of high hydrogen loss high-carbon（Aqueous 10~15%）Heated drying to temperature be 60~75 DEG C,
Water content<0.19%, carbon-to-oxygen ratio 0.25~0.33, and control cloth doses equalization stable, conglomeration granularity ＜ 5mm, the smooth light of charge level
It is sliding, and be sent into secondary reduction steel belt furnace and carry out smart reduction, control parameter is：
The bed of material 860~900mm of width, 25~28mm of thickness, 120~160mm/min of belt speed；Enter the flow of stove decomposed ammonia
For 28~36m3/ h, it is 12~15m that stove tail, which protects the flow of nitrogen,3/h；Make decomposed ammonia in stove pressure be 0.05~
0.08MPa, it is 0.50~0.70MPa to protect the pressure of nitrogen；1~10 is adjusted from low to high depending on decarburization and deoxidation effect to take off
Oxygen, decarburization area temperature be 720~900 DEG C；Slow-cooling-zone temperature is 140~180 DEG C；
B, the secondary reduction of step A outlet iron block is crushed, and through conventional classifying screen to get 200~325 purposes
Qualified micro alloy iron powder.In gained micro alloy iron powderw(TFe)-w(MFe) content 0.50~0.80%.
The main component of reduced iron powder of the high hydrogen loss high-carbon of the step A is：TFe 95.5~96.5wt%, MFe
86.0~88.0 2.50~3.0 0.65~0.85 wt % of wt %, C of wt %, HL.
Reduced iron powder of the high hydrogen loss high-carbon be by low-grade vanadium titano-magnetite and popular smokeless coal in mass ratio
It is 55~57:After 12~15 mixing, Nacl is added after the Conventional catalytic of 1040~1080 DEG C, 32~36h of heat preservation restores
Mill choosing is isolated.
The chemical composition of the 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
22.79~24.23 wt % of wt %, FeO.
The chemical composition of the popular smokeless coal is：Ash 13.46~14.80 wt %, V 7.70~9.20 wt %, S
0.43~0.80 wt %, 76.23~77.36 wt % of fixed C content.
The Nacl chemical composition is：NaCl 99.0~99.3 wt %, KCl 0.015~0.025 wt %, MgCl2
0.015~0.025 wt %, CaCl20.015~0.025 wt %, CaSO40.10~0.25 wt %, SiO20.015~
0.025 wt %。
The decomposed ammonia of the step A is H2And N2It is 3 by volume:1 mixed gas.
The purity of the protection nitrogen of the step A is 99.95~99.99%.
The step A refers to that carbon-drop rate is less than when 90%, DNA vaccine is less than 85% in temperature model depending on decarburization and deoxidation effect
Enclose adjusted from low to high in 720~900 DEG C 1~10 deoxidation, decarburization area temperature.
The present invention is based on reduced iron powders to prepare basic theory, using hydrogen, carbon reduction thermodynamics and principle of dynamics, in conjunction with
Reduced iron powder secondary reduction stove actual process parameter and control, making secondary reduction stove not only realizes resourceful and valence
The micro alloy iron powder for preparing for climbing western vanadium titano-magnetite of lattice relative moderate much, and effectively lift technique economic indicator, significantly drop
Low micro alloy iron powder manufacturing cost largely reduces catalysis reduction when western v-ti magnetite ore resources are climbed in scale use and generates
High hydrogen loss, the high iron powder of carbon content and use the not high decomposed ammonia (3H of hydrogen purity2+1N2) after to secondary reduction
The adverse effect of stove production makes the secondary reduction stove working of a furnace realize certain production intensity and long period stable smooth operation, significantly
It reduces when preparing high-quality iron powder to the dependence of high stability phosphorus concentrate powder, it is suppressed that hydrogen loss of powdered iron raising, a high-carbon
Content keeps micro alloy iron powder iron content and carbon, hydrogen loss etc. main micro alloy iron powder chemical composition, the influence amplitude of physicochemical property
Target improvement is stablized, and not only yield increased, and comprehensive manufacturing cost is remarkably decreased.Effectively expand resourceful, quality
Stablize and price it is much relatively inexpensive climb western vanadium titano-magnetite resource utilization, and obtain and be rich in a variety of alloying elements, property
The excellent micro alloy iron powder of energy.
The present invention is compared with existing reduced iron powder and alloyed iron powder, preparation method thereof, and iron powder of common process pair is at dtex
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%（It says
Bright reduction is bad）,w(C) easily occur>0.030% upper limit case,w(HL) easily occur>0.30% upper limit case；In terms of cost, pure hydrogen
Price is 10 times of decomposed ammonia, and only this item, ton iron powder manufacturing cost just differs 600~700 yuan/ton, in addition, using pure hydrogen
Security risk increases.And the present invention eliminates the reliance on the super concentrate resource of high-quality in the case where climbing western vanadium titano-magnetite resources supplIes entirely,
Scale is using an iron powder for utilizing high hydrogen loss, the carbon content of climbing western v-ti magnetite ore resources catalysis reduction generation high and uses hydrogen
Not high decomposed ammonia (the 3H of gas purity2+1N2), breakthrough is existing to utilize extraction of superpure concentrate of magnetite (TFe>70%) or iron scale and utilize vanadium
Traditional iron powder preparation mode of PRODUCTION OF IRON POWDER alloy iron powder of low-carbon hypoxemia type of titanomagnetite production.In secondary reduction stove
When averagely entering stove iron powder TFe 95.5 ~ 96.5%, 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 certain production intensity, realizes working of a furnace stable smooth operation, the micro alloy iron powder of preparationw(TFe) it breaks through
99.0%,w(C)<0.025%,w(HL)<0.30%, yield increased, and power consumption and liquefied ammonia consumption are stablized.Effectively expand money
Source is abundant, stable quality and price it is much relatively inexpensive climb western vanadium titano-magnetite resource utilization and utilization hydrogen purity not
High decomposed ammonia (3H2+1N2), the micro alloy iron powder physical and chemical index rich in a variety of alloying elements produced is preferable also, micro-
Alloy iron powder manufacturing cost reduces more than 1000 yuan/ton.
Specific implementation mode
The present invention is described further with reference to embodiment.
Embodiment 1
It is 55.65 in mass ratio by low-grade vanadium titano-magnetite and popular smokeless coal:After 13 mixing, adds Nacl and exist
1060 DEG C, keep the temperature the Conventional catalytic reduction of 33h after mill choosing be isolated a reduced iron powder of high hydrogen loss high-carbon（Mill choosing separation
Flow is：Broken → mill ore magnetic selection (repeating three times) → dehydration → drying → classification → iron powder of high hydrogen loss high-carbon one time）.
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%, fixed C content 77.36%, 60 mesh of fineness；Nacl chemical composition is：NaCl 99.3%, KCl
0.025%, MgCl20.025%, CaCl20.025%, CaSO40.25%, SiO2 0.025%。
The main component of reduced iron powder of the high hydrogen loss high-carbon of gained is：TFe 95.53%, MFe 86.2%, HL
2.85%, C 0.795%.
A, by a reduced iron powder of above-mentioned high hydrogen loss high-carbon（Aqueous 15%）Heated drying to temperature be 70 DEG C, it is aqueous
Amount<0.19%, carbon-to-oxygen ratio 0.279, and cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth are controlled, and it is sent into two
Smart reduction is carried out in secondary essence reduction steel belt furnace, control parameter is：
The bed of material width 900mm, thickness 26mm, belt speed 145mm/min；Enter stove decomposed ammonia（H2And N2It is 3 by volume:1
Mixed gas）Flow be 32m3/ h, stove tail protect nitrogen（Purity is 99.95~99.99%）Flow be 12~15m3/h；
It is 0.065MPa to make the pressure of decomposed ammonia in stove, and it is 0.65MPa to protect the pressure of nitrogen；10 deoxidations, decarburization area temperature point
It Wei not be 720 DEG C, 750 DEG C, 780 DEG C, 800 DEG C, 850 DEG C, 850 DEG C, 870 DEG C, 870 DEG C, 880 DEG C, 860 DEG C；Slow-cooling-zone temperature is
162℃；
B, the secondary reduction of step A outlet iron block is crushed, and through conventional classifying screen to get it is 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%, does not influence working of a furnace stable smooth operation and technical-economic index.
Embodiment 2
It is 55 in mass ratio by low-grade vanadium titano-magnetite and popular smokeless coal:After 12 mixing, adds Nacl and exist
1040 DEG C, keep the temperature the Conventional catalytic reduction of 36h after mill choosing be isolated a reduced iron powder of high hydrogen loss high-carbon（Mill choosing separation
Flow is：Broken → mill ore magnetic selection (repeating three times) → dehydration → drying → classification → iron powder of high hydrogen loss high-carbon one time）.
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%, fixed C content 75.88%, 60 mesh of fineness；Nacl chemical composition is：NaCl 99.2%, KCl
0.028%, MgCl20.022%, CaCl20.031%, CaSO40.27%, SiO2 0.020%。
The main component of reduced iron powder of the high hydrogen loss high-carbon of gained is：TFe 95.22%, MFe 86.0%, HL
3.05%, C 0.805%.
A, by a reduced iron powder of above-mentioned high hydrogen loss high-carbon（Aqueous 13%）Heated drying to temperature be 60 DEG C, it is aqueous
Amount<0.19%, carbon-to-oxygen ratio 0.264, and cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth are controlled, and it is sent into two
Smart reduction is carried out in secondary essence reduction steel belt furnace, control parameter is：
The bed of material width 890mm, thickness 25mm, belt speed 120mm/min；Enter stove decomposed ammonia（H2And N2It is 3 by volume:1
Mixed gas）Flow be 28m3/ h, stove tail protect nitrogen（Purity is 99.95~99.99%）Flow be 14m3/h；Make stove
The pressure of interior decomposed ammonia is 0.05MPa, and it is 0.70MPa to protect the pressure of nitrogen；10 deoxidations, decarburization area temperature are respectively
750℃、780℃、800℃、830℃、860℃、860℃、870℃、880℃、880℃、860℃；Slow-cooling-zone temperature is 169
℃；
B, the secondary reduction of step A outlet iron block is crushed, and through conventional classifying screen to get it is 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 influence working of a furnace stable smooth operation and technical-economic index.
Embodiment 3
It is 57 in mass ratio by low-grade vanadium titano-magnetite and popular smokeless coal:After 15 mixing, adds Nacl and exist
1080 DEG C, keep the temperature the Conventional catalytic reduction of 32h after mill choosing be isolated a reduced iron powder of high hydrogen loss high-carbon（Mill choosing separation
Flow is：Broken → mill ore magnetic selection (repeating three times) → dehydration → drying → classification → iron powder of high hydrogen loss high-carbon one time）.
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, fixed C content 76.01%, 60 mesh of fineness；Nacl chemical composition is：NaCl 99.32%, KCl
0.033%, MgCl20.021%, CaCl20.029%, CaSO40.23%, SiO2 0.022%。
The main component of reduced iron powder of the high hydrogen loss high-carbon of gained is：TFe 95.46%, MFe 87.06%, HL
2.58%, C 0.696%.
A, by a reduced iron powder of above-mentioned high hydrogen loss high-carbon（Aqueous 11%）Heated drying to temperature be 75 DEG C, it is aqueous
Amount<0.19%, carbon-to-oxygen ratio 0.270, and cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth are controlled, and it is sent into two
Smart reduction is carried out in secondary essence reduction steel belt furnace, control parameter is：
The bed of material width 860mm, thickness 28mm, belt speed 160mm/min；Enter stove decomposed ammonia（H2And N2It is 3 by volume:1
Mixed gas）Flow be 36m3/ h, stove tail protect nitrogen（Purity is 99.95~99.99%）Flow be 12m3/h；Make stove
The pressure of interior decomposed ammonia is 0.08MPa, and it is 0.50MPa to protect the pressure of nitrogen；10 deoxidations, decarburization area temperature are respectively
760℃、800℃、820℃、850℃、850℃、850℃、870℃、870℃、870℃、860℃；Slow-cooling-zone temperature is 180
℃；
B, the secondary reduction of step A outlet iron block is crushed, and through conventional classifying screen to get it is 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 influence working of a furnace stable smooth operation and technical-economic index.
Claims (8)
1. a kind of method that a reduced iron powder with high hydrogen loss high-carbon produces qualified micro alloy iron powder, it is characterised in that under process
Row step：
A, it is 60~75 DEG C, water content by a heated drying of reduced iron powder of high hydrogen loss high-carbon to temperature<0.19%, carbon oxygen
Than 0.25~0.33, and cloth doses equalization stable, conglomeration granularity ＜ 5mm, charge level flat smooth are controlled, and is sent into secondary reduction
Smart reduction is carried out in steel belt furnace, control parameter is：
The bed of material 860~900mm of width, 25~28mm of thickness, 120~160mm/min of belt speed；The flow for entering stove decomposed ammonia is 28
~36m3/ h, it is 12~15m that stove tail, which protects the flow of nitrogen,3/h；It is 0.05~0.08MPa to make the pressure of decomposed ammonia in stove, is protected
The pressure for protecting nitrogen is 0.50~0.70MPa；1~10 deoxidation, decarburization area are adjusted 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；Reduced iron powder of the high hydrogen loss high-carbon is by low product
Position vanadium titano-magnetite is 55~57 in mass ratio with anthracite:12~15 mixing after, add Nacl 1040~1080 DEG C,
Mill choosing is isolated after the catalysis reduction of 32~36h of heat preservation；
B, the secondary reduction of step A outlet iron block is crushed, and through classifying screen to get the micro- conjunction of qualification of 200~325 mesh
Golden iron powder.
2. the method that a reduced iron powder according to claim 1 with high hydrogen loss high-carbon produces qualified micro alloy iron powder,
It is characterized in that：The main component of reduced iron powder of the high hydrogen loss high-carbon of the step A is：95.5~96.5wt% of TFe,
86.0~88.0 2.50~3.0 0.65~0.85 wt % of wt %, C of wt %, HL of MFe.
3. the method that a reduced iron powder according to claim 1 with high hydrogen loss high-carbon produces qualified micro alloy iron powder,
It is characterized in that：The chemical composition of the 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 22.79~24.23 wt % of wt %, FeO.
4. the method that a reduced iron powder according to claim 1 with high hydrogen loss high-carbon produces qualified micro alloy iron powder,
It is characterized in that：The anthracitic chemical composition is：Ash 13.46~14.80 wt %, V 7.70~9.20 wt%, S
0.43~0.80 wt %, 76.23~77.36 wt % of fixed C content.
5. the method that a reduced iron powder according to claim 1 with high hydrogen loss high-carbon produces qualified micro alloy iron powder,
It is characterized in that：The Nacl chemical composition is：99.0~99.3 0.015~0.025 wt % of wt %, KCl of NaCl,
MgCl20.015~0.025 wt %, CaCl20.015~0.025 wt %, CaSO40.10~0.25 wt %,
SiO20.015~0.025 wt %.
6. the method that a reduced iron powder according to claim 1 with high hydrogen loss high-carbon produces qualified micro alloy iron powder,
It is characterized in that：The decomposed ammonia of the step A is that H2 and N2 are 3 by volume:1 mixed gas.
7. the method that a reduced iron powder according to claim 1 with high hydrogen loss high-carbon produces qualified micro alloy iron powder,
It is characterized in that：The purity of the protection nitrogen of the step A is 99.95~99.99%.
8. the method that a reduced iron powder according to claim 1 with high hydrogen loss high-carbon produces qualified micro alloy iron powder,
It is characterized in that：The step A refers to that carbon-drop rate is less than when 90%, DNA vaccine is less than 85% in temperature depending on decarburization and deoxidation effect
Adjusted from low to high in 720~900 DEG C of range 1~10 deoxidation, decarburization area temperature.
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| CN101586172A (en) * | 2009-07-06 | 2009-11-25 | 何德武 | Method for preparing metallized pellet and reduced iron powder |
| CN102827985A (en) * | 2012-07-24 | 2012-12-19 | 长沙市岳麓区东新科技开发有限公司 | Method for preparing novel excellent fine granule trace alloy iron powder |
| CN104190950A (en) * | 2014-07-25 | 2014-12-10 | 玉溪大红山矿业有限公司 | Iron powder production process |
| CN104232826A (en) * | 2014-10-21 | 2014-12-24 | 郭瑛 | Iron-making method with low grade refractory iron ore and equipment thereof |
| CN104862440A (en) * | 2015-03-19 | 2015-08-26 | 中南大学 | Low-grade iron ore direct reduction method |
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| WO2008089060A1 (en) * | 2007-01-12 | 2008-07-24 | Nu-Iron Technology, Llc | System and method for cooling and removing iron from a hearth |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586172A (en) * | 2009-07-06 | 2009-11-25 | 何德武 | Method for preparing metallized pellet and reduced iron powder |
| CN102827985A (en) * | 2012-07-24 | 2012-12-19 | 长沙市岳麓区东新科技开发有限公司 | Method for preparing novel excellent fine granule trace alloy iron powder |
| CN104190950A (en) * | 2014-07-25 | 2014-12-10 | 玉溪大红山矿业有限公司 | Iron powder production process |
| CN104232826A (en) * | 2014-10-21 | 2014-12-24 | 郭瑛 | Iron-making method with low grade refractory iron ore and equipment thereof |
| CN104862440A (en) * | 2015-03-19 | 2015-08-26 | 中南大学 | Low-grade iron ore direct reduction method |
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