CN109868336A - A kind of method of manganese content in control molten steel - Google Patents
A kind of method of manganese content in control molten steel Download PDFInfo
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Abstract
The present invention provides a kind of method for controlling manganese content in molten steel, comprising the following steps: (1) is incorporated low-phosphorous rich manganese ore fine powder during Sintering Blend and Bessemer ore fine powder obtains sinter；(2) rich manganese molten iron is smelted with sinter, obtains that manganese content is 15~25%, carbon content is 3~5%, iron content is 70~80%, the rich manganese molten iron of P content≤0.07%, S content less than 0.03%；(3) it is blended into the molten iron of conventional ingredients into converter, controls blowing end point temperature >=1670 DEG C of molten steel, controls blowing end point phosphorus content≤0.017% of molten steel；(4) before converter tapping, rich manganese molten iron is blended into empty ladle；(5) tapping to 1/2~3/4 when silicon alloy is added into molten steel, add manganese alloy or carbon dust.Molten Steel Cleanliness obtained by the method for the present invention is high, and existing method is compared and cost and the energy is greatly saved, and the rate of recovery of manganese can reach 80% or more in manganese ore.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, in particular it relates to manganese content in a kind of control molten steel
Method.
Background technique
Manganese is the alloying element that dosage is most wide in current steel, and suitable manganese can effectively improve steel strength, eliminates sulphur pair
The hot-short influence of steel improves steel hot-working character, while not significantly reducing the plasticity of steel, impact flexibility, normal carbon
The content of manganese is about 0.3~1.5% in steel.At present the manganese content in the maximum screw-thread steel of steel grade yield generally 1.0~
1.5%.
The manganese content in molten steel is controlled by the method to molten steel addition manganese iron, silicomanganese at present, at present containing manganese 64%
High carbon ferromanganese price is about 7000 yuan/ton, and the silicomanganese price containing manganese 64% is about 8000 yuan/ton, and price is more expensive, and Mn series alloy disappears
Consumption is a part very big in steel mill's cost of alloy, and 1% manganese about needs 120 yuan/ton of steel in averagely about every increase molten steel.And mesh
The price of preceding manganese ore is but extremely cheap, and the manganese ore price containing manganese 50% is about 1500 yuan/ton at present.Compared to manganese iron, using manganese ore
Increase manganese into instinct reduction by 70% to molten steel.Steel mill at present it is conventional increase manganese mode be first by hot manganese alloy (silicomangan,
High carbon ferromanganese alloy, mid-carbon fe-mn alloy, ferromanganese alloy etc.) it is cooling after transport to steel mill increase manganese, manganese alloy price is high
It is expensive, cost of alloy is high, and the thermal loss of hot manganese alloy falls, and causes energy waste.
If but manganese ore is added in molten steel directly in converter steelmaking process, the rate of recovery of manganese is low, and most of manganese is with MnO's
Form enters in clinker, the rate of recovery of manganese about 10~30%.Application No. is 201310478304.4 patents of invention (to improve small turn
The smelting process of furnace endpoint molten steel manganese content) one kind is provided specifically for primary converter feature, can effectively it implement on primary converter
It is added directly the technique of manganese ore.But according to technology described in the patent, the rate of recovery of Mn also only can reach 37% in manganese ore,
The rate of recovery of manganese is still lower.
Summary of the invention
In view of the above problems, the present invention provide it is a kind of control molten steel in manganese content method, can low cost to molten steel into
Row increases manganese.
The method of manganese content, includes the following steps in a kind of control molten steel,
(1) low-phosphorous rich manganese ore fine powder and Bessemer ore fine powder, low-phosphorous rich manganese ore fine powder in sinter are incorporated in sinter
Mass percent be 15~25%；
(2) rich manganese molten iron is smelted with above-mentioned sinter in blast fumance, obtains that manganese content is 15~25%, carbon content is
3~5%, iron content is 70~80%, the rich manganese molten iron of P content≤0.07%, S content less than 0.03%, rich when blast furnace casting
Temperature >=1500 DEG C of manganese molten iron；
(3) before bessemerizing, the molten iron of conventional ingredients is blended into converter, according to pneumatic steelmaking work during bessemerizing
Skill blowing molten iron, controls blowing end point temperature >=1670 DEG C of molten steel, controls blowing end point phosphorus content≤0.017% of molten steel,
Obtain molten steel；
(4) before converter tapping, step (2) the rich manganese molten iron, the rich manganese molten iron amount of being blended into basis are blended into empty ladle
Carbon, manganese composition in steel grade are calculated, and System for Blowing Argon at Bottom is then opened；
(5) steel ladle bottom argon blowing valve is transferred to maximum opening in converter tapping process, carries out strong mixing, tapping to 1/ to molten steel
Silicon alloy is added when 2~3/4 into molten steel and adds carbon dust or manganese alloy.
Steel plant select the lower small blast furnace of yield to produce rich manganese molten iron, to steel when producing rich manganese molten iron
Material total output influences little.
Preferably, further include in the sinter mass fraction be 57~67% Bessemer ore fine powder；Mass fraction is 4
The coke powder or anthracite that dolomite that~6% lime, mass fraction are 7~9%, mass fraction are 4~5%.
Preferably, the manufacturing process of low-phosphorous richness manganese ore fine powder described in step (1) are as follows: low-phosphorous richness manganese ore is in ore dressing process
It is milled to granularity≤0.038mm, the phosphate particle in low-phosphorous manganese ore is separated with manganese ore composition granule, Mn is then obtained after magnetic separation
>=50%, P≤0.040%, the low-phosphorous manganese ore fine powder of S≤0.3%.
Preferably, the manufacturing process of Bessemer ore fine powder described in step (1) are as follows: low-phosphorous iron ore concentrate is ground in ore dressing process
To granularity≤0.038mm, separates the phosphate particle in low-phosphorous iron ore concentrate with iron ore composition granule, Fe is then obtained after magnetic separation
>=62%, P≤0.07%, the Bessemer ore fine powder of S≤0.3%.
Preferably, the Bottom Blowing Gas Flow Rate control valve opening of control bottom blowing ar system is maximum valve opening in step (4)
20%~30%.
Preferably, in the step (4) the rich manganese molten iron amount of being blended into calculation method are as follows: according to converter smelting endpoint molten steel at
The carbon content of carbon content, Metal Weight, rich manganese molten iron, the target carbometer calculating of steel grade in part are assigned to target carbon content need
The rich manganese iron water amount being blended into, is denoted as X1；According to manganese content, Metal Weight, the rich manganese molten iron in converter smelting endpoint molten steel composition
Manganese content, steel grade target manganese content calculate and be assigned to the rich manganese iron water amount that target manganese content need to be blended into, be denoted as X2；Rich manganese iron
Actually being blended into for water measures in X1, X2 value lesser one.
The specific formula for calculation for the rich manganese iron water amount X1 that need to be blended into are as follows: (the target carbon content of steel grade-converter smelting is whole by X1=
Carbon content in point molten steel composition) × Metal Weight/(carbon content-steel grade target carbon content of rich manganese molten iron)；
The specific formula for calculation for the rich manganese iron water amount X2 that need to be blended into are as follows: (the target manganese content of steel grade-converter smelting is whole by X2=
Manganese content in point molten steel composition) × Metal Weight/(manganese content-steel grade target manganese content of rich manganese molten iron).
In order to avoid manganese content in molten steel or carbon content are beyond subject component requirement, rich manganese molten iron is actually blended into measurement
Lesser one in X1, X2 value.After being blended into rich manganese molten iron, for not being able to satisfy the carbon content or manganese of target molten steel composition requirement still
Content adds the method for carbon dust or Mn series alloy to molten steel when step (5) tapping is to 1/2~3/4 to realize.
It is further preferred that manganese alloy need to be added as X1 < X2, the calculation method for the manganese alloy weight that need to be added are as follows: root
According to manganese in the mass percentage of manganese in the difference of X2 and X1, the manganese content of rich manganese molten iron, manganese alloy, manganese alloy adition process
The rate of recovery calculates the manganese alloy weight that need to be added, specific formula for calculation are as follows: manganese alloy weight=(X2-X1) × richness manganese molten iron
Manganese content/(rate of recovery of manganese in manganese content × manganese alloy adition process in manganese alloy)；
As X1 > X2, carbon dust need to be added, the calculation method for the carbon dust weight that need to be added are as follows: according to the difference of X1 and X2, richness
The rate of recovery in the carbon content of manganese molten iron, carbon dust adition process calculates the carbon dust weight that need to be added, specific formula for calculation are as follows:
Carbon dust weight=(X1-X2) × richness manganese molten iron carbon content/(rate of recovery of carbon in carbon dust adition process).
Preferably, in the step (3), before bessemerizing, the amount of being actually loaded into of molten iron reduces identical compared with standard charge weight
Lesser one in calculated X1, X2 value of upper heat institute of steel grade.
In the converter tapping process of step (5), part carbon and manganese in rich manganese molten iron participate in deoxygenation and consume, and remain
Remaining carbon and manganese plays the role of alloying.
The content of each ingredient is mass percent unless otherwise specified in the present invention.
The invention has the benefit that
1, the price of manganese ore is far below manganeisen, and using technology provided by the present application, the rate of recovery of manganese can reach in manganese ore
To 80% or more, can be more cheap obtain rich manganese molten iron.Molten steel is increased using rich manganese molten iron in converter tapping process
Manganese, increasing the cost spent required for 1% manganese in molten steel is 30~50 yuan/ton of steel；If being increased with manganeisen to molten steel
Manganese, increasing the cost spent required for 1% manganese in molten steel is 110~130 yuan/ton of steel；Molten steel is carried out using rich manganese molten iron
Manganese alloy cost about 70% can be reduced by increasing manganese.
2, the rate of recovery of the method for the present invention manganese is up to 80% or more, than the existing side being directly added to manganese ore in molten steel
The rate of recovery of method manganese, which has, to be significantly improved.
3, in rich manganese molten iron containing 3~5% carbon, which plays the role of deoxidier and carbon alloy, can reduce and take off
Oxygen agent consumption, and deoxidation products is gaseous state CO, gaseous state CO burns under molten steel temperature (1600 DEG C or so) generates CO2Into air
In, deoxidation products will not being retained in molten steel and being mingled with, Molten Steel Cleanliness is high.
4, conventional to increase manganese mode are as follows: Alloy Plant produces hot manganese alloy, then will hot manganese alloy it is cooling after transport to
Steel mill increases manganese for molten steel, and under the mode, the thermal loss of hot manganese alloy falls, and causes the waste of the energy.Rich manganese molten iron quilt
When being transported to converter region about 1300~1500 DEG C of temperature (richness manganese molten iron temperature is greater than 1500 DEG C when blast furnace casting, in tapping and
Some heat loss is fallen in transportational process), it is small that molten steel temperature drop caused by increasing manganese is carried out to molten steel using hot rich manganese molten iron.
5, generally there are more than 10 seat height furnaces in extensive iron and steel enterprise at present, and the blast furnace under taking out a scale most is dedicated for life
Rich manganese molten iron is produced, and rich manganese molten iron finally can also be converted into steel, have no effect on steel total output.
Specific embodiment
The present invention control molten steel in manganese content method the following steps are included:
1, a lower small blast furnace of yield is selected to produce rich manganese molten iron, sintering used in the blast furnace in steel plant
Mine is incorporated low-phosphorous rich manganese ore fine powder and Bessemer ore fine powder, quality of the low-phosphorous richness manganese ore fine powder in sinter in blending process
Percentage is 15~25%, and mass percent of the Bessemer ore fine powder in sinter is 57~67%.
The manufacturing process of the low-phosphorous manganese ore fine powder are as follows: low-phosphorous richness manganese ore is milled to granularity≤0.038mm in ore dressing process,
It separates the phosphate particle in low-phosphorous manganese ore with manganese ore composition granule, then obtains Mn >=50% after magnetic separation, P≤0.040%,
The low-phosphorous manganese ore fine powder of S≤0.3%.
The manufacturing process of the Bessemer ore fine powder are as follows: low-phosphorous iron ore concentrate is milled to granularity≤0.038mm in ore dressing process,
It separates the phosphate particle in low-phosphorous iron ore concentrate with iron ore composition granule, then obtains Fe >=62% after magnetic separation, P≤
The Bessemer ore fine powder of 0.07%, S≤0.3%.
Sintering deposit raw material in the present invention further include mass percent be 4~6% lime, mass percent be 7~9%
Dolomite, mass percent be 4~5% coke powder or anthracite.
2, in blast fumance with above-mentioned sinter smelting molten iron, obtain manganese content be 15~25%, carbon content 3~5%,
The rich manganese molten iron of iron content 70~80%, P content≤0.07%, S content less than 0.03%, molten iron temperature >=1500 DEG C.
3, before bessemerizing, it is blended into the molten iron of normal conventional composition into converter, is refined during bessemerizing according to converter
Steel technique blows molten iron, controls blowing end point temperature >=1670 DEG C of molten steel, control the blowing end point phosphorus content of molten steel≤
0.017%, obtain molten steel.
4, before converter tapping, a part of rich manganese molten iron is blended into empty ladle, the rich manganese molten iron amount of being blended into is according in steel grade
Carbon, manganese composition calculated, then open System for Blowing Argon at Bottom, control Bottom Blowing Gas Flow Rate control valve opening is 20%~
30%.
The calculation method of the rich manganese molten iron amount of being blended into of the step 4 are as follows: contained according to the carbon in converter smelting endpoint molten steel composition
The target carbometer calculating of amount, Metal Weight, the carbon content of rich manganese molten iron, steel grade is assigned to the rich manganese that target carbon content need to be blended into
Iron water amount is denoted as X1；According in converter smelting endpoint molten steel composition manganese content, Metal Weight, rich manganese molten iron manganese content, steel
The target manganese content of kind, which calculates, is assigned to the rich manganese iron water amount that target manganese content need to be blended into, and is denoted as X2, rich manganese molten iron is actually converted
Enter to measure in X1, X2 value lesser one.
5, steel ladle bottom argon blowing valve is transferred to maximum in converter tapping process, carries out strong mixing, tapping to 1/2 to 3/ to molten steel
4 silicon alloy is added into molten steel, and adds manganese alloy or carbon dust.In converter tapping process, a part of carbon in rich manganese molten iron and
Manganese participates in deoxygenation and consumes, and remaining carbon and manganese play the role of alloying.
The molten iron that conventional ingredients are blended into described in step (3) refers to the amount of being actually added into of molten iron, the Standard entertion of molten iron
Amount=(the iron and steel stock rate of recovery in converter nominal tonnage/converter steelmaking process)-adding amount of scrap steel.
In the step 3, before bessemerizing, the amount of being actually loaded into of molten iron reduces smaller in X1, X2 value compared with standard charge weight
One, since X1, X2 value of this heat when being blended into molten iron can not also calculate.Since the amount of being actually loaded into of molten iron does not need
It is very accurate, the control of molten iron charge weight will not influence to the normal smelting of converter in the error within 5%, therefore using identical
A upper heat for steel grade the calculated rich manganese molten iron amount of being blended into X1, X2 value instruct the amount of being actually loaded into of this heat molten iron.If
The steel grade is smelted for the first time, can refer to the iron water amount that close steel grade is blended into converter smelting, close steel grade is carbon in molten steel
Subject component difference is less than 0.05%, steel grade of the subject component difference less than 0.3% of manganese.
This heat molten iron is instructed using the calculated rich manganese molten iron amount of being blended into X1, X2 value of a upper heat for identical steel grade institute
The amount of being actually loaded into, prevent molten iron from converting more, the molten steel that converter is produced is too many, thus exceed ladle capacity, cause molten steel to overflow.
Phosphorus drops in ore dressing: the embedding cloth relationship of ore Minerals and phosphorus is considerably complicated, and phosphorus is various informative present in the ore, but
The embedding cloth relationship of phosphorus and iron mineral can be summarized as two kinds, and one is phosphorus and iron all with the appearance of independent mineral, another kind be phosphorus with
Ionic adsorption state form is present in iron mineral, for phosphorus existing for the first form, can be made by fine grinding metalliferous mineral with
Phosphate minerals will be completely dissociated, and then be sorted using magnetic method.Low-phosphorous rich manganese ore and Bessemer ore are milled to granularity and be less than
0.035mm can be such that phosphorus ore composition granule existing for the first form separates with metalliferous mineral particle, after magnetic separation, phosphorus ore composition granule
Into in tailing, dephosphorization rate can reach 40~50%.
The control of phosphorus content in molten steel: limiting the phosphorus content in iron-smelting raw material, phosphorus content model in rich manganese molten iron
It encloses for P≤0.07%, manganese content range is 15~25%, is computed, and increases 0.5~1.5% to molten steel according to rich manganese molten iron
Manganese can then increase 0.0014~0.007% phosphorus to molten steel accordingly.The feelings of P≤0.017% in molten steel are controlled before converter tapping
Under condition, after being blended into rich manganese molten iron, phosphorus content in molten steel are as follows: 0.0184%≤P≤0.024%, the phosphorus content energy of the composition range
Meet the requirement of HRB400~HRB600 screw-thread steel, Q345B, 45 steel, 50 steel, 65Mn, 45Mn, and the steel of the part trade mark are
The maximum a kind of steel of current production rate, account for about 60% or more of steel total amount.
Liquid steel temperature control: manganese content range is 15~25% in rich manganese molten iron, increases 0.5 to molten steel according to rich manganese molten iron
~1.5% manganese, is computed, and the amount of being blended into of rich manganese molten iron is the 2~10% of Metal Weight.Rich manganese molten iron temperature is about 1300~
1500 DEG C, liquid steel temperature is about 1550~1650 DEG C, and after carrying out increasing manganese to molten steel using rich manganese molten iron, liquid steel temperature can reduce by 5
~20 DEG C, liquid steel temperature can't be reduced using the temperature drop that rich manganese molten iron increase manganese generation to molten steel.
Deoxidation effect: in rich manganese molten iron containing 3~5% carbon, in carbon and oxygen balance reaction formula, the C with 3~5% is flat
The oxygen content of weighing apparatus is less than 10ppm, so rich manganese molten iron can play great deoxidation effect, can about save deoxygenated alloy consumption 50%
More than.
Carbon dust consumption: in rich manganese molten iron containing 3~5% carbon, if using the amount of being blended into of rich manganese molten iron as Metal Weight 2~
10% calculates, and can be able to satisfy the carbon content demand of most of steel grade to molten steel recarburization 0.06~0.5%, save carbon dust addition
Amount.
The setting of manganese carbon ratio in rich manganese molten iron: containing manganese in rich manganese molten iron: 15~25%, it is carbon containing: 3~5%, WMn/WC=3~
8, wherein WMn/WCFor the mass ratio of manganese and carbon in molten iron or molten steel composition, at present containing the higher common steel grade HRB400 of manganese~
HRB600 screw-thread steel, Q345B, 45 steel, 50 steel, W in 65Mn, 45Mn compositionMn/WCValue substantially also be 3~8, using rich manganese iron
Water, which can directly be completed at the same time such steel grade, increases manganese and recarburization practice.
Below with reference to embodiment, present invention is further described in detail.But the present invention is not limited to given examples.
Embodiment 1
1, certain steel mill's aggregated capacity is 12,000,000 tons of steel/years, shares 13 seat height furnaces, selects a wherein the smallest 750m3It is high
Furnace produces rich manganese molten iron for special, and sinter used in the blast furnace is incorporated low-phosphorous rich manganese ore fine powder and low in blending process
Ferrophosphorus tantalite power, low-phosphorous richness manganese ore fine powder account for the mass percent 15% of sinter.Bessemer ore fine powder accounts for the quality of sinter
Percentage is 67%.In sinter also comprising mass percent be 5% lime, mass percent be 8% dolomite and matter
Measuring percentage is 5%.The manufacturing process of the low-phosphorous manganese ore fine powder are as follows: it is low-phosphorous richness manganese ore be milled in ore dressing process granularity≤
0.035mm separates the phosphate particle in low-phosphorous manganese ore with manganese ore composition granule, then obtains Mn >=50% after magnetic separation, and P≤
The low-phosphorous manganese ore fine powder of 0.040%, S≤0.3%.
The manufacturing process of the low-phosphorous fine iron breeze are as follows: Bessemer ore is milled to granularity≤0.035mm in ore dressing process, makes
Phosphate particle in Bessemer ore is separated with iron ore composition granule, then obtains Fe >=62% after magnetic separation, and P≤0.07%, S≤
The 0.3% low-phosphorous fine iron breeze
2, with the sinter smelting molten iron in blast fumance, obtaining manganese content is 15%, carbon content 3%, iron content
80%, the rich manganese molten iron of P content≤0.07%, S content less than 0.03%, molten iron temperature >=1500 DEG C.
3, the screw-thread steel for the converter smelting HRB400 trade mark for the use of nominal tonnage being 80 tons, before bessemerizing, into converter
8 tons of 81 tons of molten iron, the steel scrap (molten iron is low-sulfur molten iron, and the property data of molten iron is shown in Table 2) of normal conventional composition is added, turns
According to converter steelmaking process blowing molten iron in furnace converting process, blowing end point temperature >=1670 DEG C of molten steel are controlled, molten steel is controlled
Blowing end point phosphorus content≤0.017%, obtain molten steel；The property data of converter molten steel is shown in Table 1.
4, before converter tapping, 4.3 tons of rich manganese molten iron are blended into empty ladle, the rich manganese molten iron amount of being blended into is according in steel grade
Carbon, manganese composition are calculated, and then open System for Blowing Argon at Bottom, and control Bottom Blowing Gas Flow Rate control valve opening is 20%~
30%.
The calculation method of the rich manganese molten iron amount of being blended into are as follows: according to the carbon content in converter smelting endpoint molten steel composition, molten steel weight
The target carbometer calculating of amount, the carbon content of rich manganese molten iron, steel grade is assigned to the rich manganese iron water amount that target carbon content need to be blended into, and remembers
For X1,
Calculating process are as follows: the carbon content in converter smelting endpoint molten steel composition is 0.10%, Metal Weight is 80 tons, Fu Meng
The carbon content of molten iron is 3%, the target carbon content of steel grade is 0.25%.
X1=(80 tons × 0.25-80 tons × 0.1)/(3-0.25)
X1=4.3 tons
According in converter smelting endpoint molten steel composition manganese content, Metal Weight, the manganese content of rich manganese molten iron, steel grade mesh
Mark manganese content, which calculates, is assigned to the rich manganese iron water amount that target manganese content need to be blended into, and is denoted as X2.
Calculating process are as follows: the manganese content in converter smelting endpoint molten steel composition is 0.07%, Metal Weight is 80 tons, Fu Meng
The manganese content of molten iron is 15%, the target manganese content of steel grade is 1.2%.
X2=(80 tons × 1.2-80 tons × 0.07)/(15-1.2)
X2=6.5 tons
Actually being blended into for rich manganese molten iron measures in X1, X2 value lesser one, it may be assumed that the actually amount of being blended into of rich manganese molten iron is
4.3 ton.
It is computed, before bessemerizing, the amount of being actually loaded into of molten iron need to reduce 4.3 tons compared with standard charge weight, furnace afterwards
Secondary to carry out increasing manganese production HRB400 steel grade to molten steel using rich manganese molten iron when operating, the amount of being actually loaded into of molten iron need to be packed into compared with standard
Amount reduces 4.3 tons.
5, steel ladle bottom argon blowing valve is transferred to maximum in converter tapping process, carries out strong mixing, tapping to 1/2 to 3/ to molten steel
4 Antaciron (FeSi75) 188kg, silicomangan (FeMn64Si18) 607kg are added into molten steel.
Silicomangan additional amount=(X2-X1) × richness manganese molten iron manganese content/(manganese content × manganese alloy in manganese alloy adds
The rate of recovery of manganese during entering)=(0.64 × the 0.85)=607kg of (6.5 tons -4.3 tons) × 0.15/.
Antaciron additional amount=(silicone content-silicomangan additional amount × silicon in Metal Weight × molten steel subject component
The rate of recovery of silicon in silicone content × silicomangan adition process in manganese alloy)/(silicone content × Antaciron in Antaciron
The rate of recovery of silicon in adition process)=(80 tons × 0.0025-607kg × 0.18 × 0.8)/(0.75 × 0.8)=188kg.
In converter tapping process, a part of carbon and manganese in rich manganese molten iron participate in deoxygenation and consume, remaining carbon
Play the role of alloying with manganese.
The mass percent of silicon is 18% in the silicomangan added, and the mass percent containing manganese is 64%.
85 tons of qualified HRB400 molten steel are finally made, property data is shown in Table 3, and molten steel meets national standard, due to richness
Manganese molten iron play the role of increase molten steel in 0.75% manganese and increase molten steel in 0.15% carbon effect, be computed reduction manganese
50 yuan/ton of steel of cost of alloy.
Embodiment 2
1, certain steel mill's aggregated capacity is 12,000,000 tons of steel/years, shares 13 and does blast furnace, selects a wherein the smallest 750m3It is high
Furnace produces rich manganese molten iron for special, and sinter used in the blast furnace is incorporated low-phosphorous rich manganese ore fine powder and low in blending process
Ferrophosphorus tantalite power, the mass percent that low-phosphorous richness manganese ore fine powder accounts for sinter is 25%, and Bessemer ore fine powder accounts for the matter of sinter
Measuring percentage is 57%.Sinter further include mass percent be 4% lime 9% dolomite, 5% coke powder.
The manufacturing process of the low-phosphorous manganese ore fine powder are as follows: low-phosphorous richness manganese ore is milled to granularity≤0.035mm in ore dressing process,
It separates the phosphate particle in low-phosphorous manganese ore with manganese ore composition granule, then obtains Mn >=50% after magnetic separation, P≤0.040%,
The low-phosphorous manganese ore fine powder of S≤0.3%.
The manufacturing process of the low-phosphorous fine iron breeze are as follows: Bessemer ore is milled to granularity≤0.035mm in ore dressing process, makes
Phosphate particle in Bessemer ore is separated with iron ore composition granule, then obtains Fe >=62% after magnetic separation, and P≤0.07%, S≤
The 0.3% low-phosphorous fine iron breeze
2, with above-mentioned sinter smelting molten iron in blast fumance, obtaining manganese content is 25%, carbon content 5%, iron content
69%, the rich manganese molten iron of P content≤0.07%, S content less than 0.03%, molten iron temperature >=1500 DEG C.
3, the high-carbon steel for the converter smelting 65Mn trade mark for the use of nominal tonnage being 120 tons before bessemerizing, adds into converter
Enter 122 tons of molten iron of normal conventional composition, 10 tons of steel scrap (molten iron is low-sulfur molten iron, and the property data of molten iron is shown in Table 2) turns
According to converter steelmaking process blowing molten iron in furnace converting process, blowing end point temperature >=1670 DEG C of molten steel are controlled, molten steel is controlled
Blowing end point phosphorus content≤0.017%, obtain molten steel；The property data of converter molten steel is shown in Table 1.
4, before converter tapping, 4.55 tons of rich manganese molten iron are blended into empty ladle, the rich manganese molten iron amount of being blended into is according in steel grade
Carbon, manganese composition calculated, then open System for Blowing Argon at Bottom, control Bottom Blowing Gas Flow Rate control valve opening is 20%~
30%.
The calculation method of the rich manganese molten iron amount of being blended into of the step 4 are as follows: contained according to the carbon in converter smelting endpoint molten steel composition
The target carbometer calculating of amount, Metal Weight, the carbon content of rich manganese molten iron, steel grade is assigned to the rich manganese that target carbon content need to be blended into
Iron water amount is denoted as X1,
Calculating process are as follows: the carbon content in converter smelting endpoint molten steel composition is 0.15%, Metal Weight is 120 tons, rich
The carbon content of manganese molten iron is 5%, the target carbon content of steel grade is 0.65%.
X1=(120 tons × 0.65-120 tons × 0.15)/(5-0.65)
X1=13.8 tons
According in converter smelting endpoint molten steel composition manganese content, Metal Weight, the manganese content of rich manganese molten iron, steel grade mesh
Mark manganese content, which calculates, is assigned to the rich manganese iron water amount that target manganese content need to be blended into, and is denoted as X2.
Calculating process are as follows: the manganese content in converter smelting endpoint molten steel composition is 0.09%, Metal Weight is 120 tons, rich
The manganese content of manganese molten iron is 25%, the target manganese content of steel grade is 1.0%.
X2=(120 tons × 1.0-120 tons × 0.09)/(25-1.0)
X2=4.55 tons
Actually being blended into for rich manganese molten iron measures in X1, X2 value lesser one, it may be assumed that the actually amount of being blended into of rich manganese molten iron is
4.55 ton.
It is computed, before bessemerizing, the amount of being actually loaded into of molten iron need to reduce 4.55 tons compared with standard charge weight, furnace afterwards
It is secondary increase manganese operation to molten steel using rich manganese molten iron come when producing 65Mn steel grade, the amount of being actually loaded into of molten iron be packed into compared with standard
Amount reduces 4.55 tons.
5, steel ladle bottom argon blowing valve is transferred to maximum in converter tapping process, carries out strong mixing, tapping to 1/2 to 3/ to molten steel
4 silicon alloy (FeSi75B) 420kg, carbon dust 661kg is added into molten steel.A part in converter tapping process, in rich manganese molten iron
Carbon and manganese participate in deoxygenation and consume, and remaining carbon and manganese play the role of alloying.
Its specific formula for calculation are as follows: carbon dust weight=(X1-X2) × richness manganese molten iron carbon content/(in carbon dust adition process
The rate of recovery of carbon)=(13.8 tons -4.55 tons) × 0.05/0.7=661kg；
Antaciron additional amount=(silicone content in Metal Weight × molten steel subject component)/(silicon in Antaciron contains
The rate of recovery of silicon in amount × Antaciron adition process)=(120 tons × 0.002)/(0.75 × 0.8)=400kg.
125 tons of qualified 65Mn molten steel are finally made, property data is shown in Table 3, and molten steel meets national standard, due to rich manganese
Molten iron plays the role of increasing in molten steel 0.91% manganese, and being computed reduces by 70 yuan/ton of steel of manganese alloy cost.
Embodiment 3
1, certain steel mill's aggregated capacity is 12,000,000 tons of steel/years, shares 13 and does blast furnace, selects a wherein the smallest 750m3It is high
Furnace produces rich manganese molten iron for special, and sinter used in the blast furnace is incorporated low-phosphorous rich manganese ore fine powder and low in blending process
Ferrophosphorus tantalite power, mass percent of the low-phosphorous richness manganese ore fine powder in sinter is 20%.Bessemer ore fine powder accounts for sinter
Mass percent is 62%.Further include in sinter mass percent be 5% lime, mass fraction be 9% dolomite and
The anthracite that mass fraction is 4%.
The manufacturing process of the low-phosphorous manganese ore fine powder are as follows: low-phosphorous richness manganese ore is milled to granularity≤0.035mm in ore dressing process,
It separates the phosphate particle in low-phosphorous manganese ore with manganese ore composition granule, then obtains Mn >=50% after magnetic separation, P≤0.040%,
The low-phosphorous manganese ore fine powder of S≤0.3%.
The manufacturing process of low-phosphorous fine iron breeze are as follows: Bessemer ore is milled to granularity≤0.035mm in ore dressing process, makes low-phosphorous
Phosphate particle in iron ore is separated with iron ore composition granule, then obtains Fe >=62% after magnetic separation, and P≤0.07%, S≤
The 0.3% low-phosphorous fine iron breeze.
2, with above-mentioned sinter smelting molten iron in blast fumance, obtaining manganese content is 20%, carbon content 4%, iron content
75%, the rich manganese molten iron of P content≤0.07%, S content less than 0.03%, molten iron temperature >=1500 DEG C.
3, the quality carbon steel for 45 trade mark of converter smelting for the use of nominal tonnage being 100 tons, before bessemerizing, is added into converter
103 tons of the molten iron of normal conventional composition, 9 tons of steel scrap (molten iron is low-sulfur molten iron, and the property data of molten iron is shown in Table 2), converter
According to converter steelmaking process blowing molten iron in converting process, blowing end point temperature >=1670 DEG C of molten steel are controlled, molten steel is controlled
Blowing end point phosphorus content≤0.017%, obtains molten steel；The property data of converter molten steel is shown in Table 1.
4, before converter tapping, 3.2 tons of rich manganese molten iron are converted into empty ladle, the rich manganese molten iron amount of being blended into is according in steel grade
Carbon, manganese composition are calculated, and then open System for Blowing Argon at Bottom, and control Bottom Blowing Gas Flow Rate control valve opening is 20%~
30%.
The calculation method of the rich manganese molten iron amount of being blended into of the step 4 are as follows: contained according to the carbon in converter smelting endpoint molten steel composition
The target carbometer calculating of amount, Metal Weight, the carbon content of rich manganese molten iron, steel grade is assigned to the rich manganese that target carbon content need to be blended into
Iron water amount is denoted as X1,
Calculating process are as follows: the carbon content in converter smelting endpoint molten steel composition is 0.12%, Metal Weight is 100 tons, rich
The carbon content of manganese molten iron is 4%, the target carbon content of steel grade is 0.45%.
X1=(100 tons × 0.45-100 tons × 0.12)/(4-0.45)
X1=9.5 tons
According in converter smelting endpoint molten steel composition manganese content, Metal Weight, the manganese content of rich manganese molten iron, steel grade mesh
Mark manganese content, which calculates, is assigned to the rich manganese iron water amount that target manganese content need to be blended into, and is denoted as X2.
Calculating process are as follows: the manganese content in converter smelting endpoint molten steel composition is 0.08%, Metal Weight is 100 tons, rich
The manganese content of manganese molten iron is 20%, the target manganese content of steel grade is 0.7%.
X2=(100 tons × 0.7-100 tons × 0.08)/(20-0.7)
X2=3.2 tons
Actually being blended into for rich manganese molten iron measures in X1, X2 value lesser one, it may be assumed that the actually amount of being blended into of rich manganese molten iron is
3.2 ton.
It is computed, before bessemerizing, the amount of being actually loaded into of molten iron need to reduce 3.2 tons compared with standard charge weight, furnace afterwards
It is secondary increase manganese operation to molten steel using rich manganese molten iron come when producing 65Mn steel grade, the amount of being actually loaded into of molten iron be packed into compared with standard
Amount reduces 3.2 tons.
5, steel ladle bottom argon blowing valve is transferred to maximum in converter tapping process, carries out strong mixing, tapping to 1/2 to 3/ to molten steel
4 silicon alloy (FeSi75B) 333kg, carbon dust 360kg is added into molten steel.A part in converter tapping process, in rich manganese molten iron
Carbon and manganese participate in deoxygenation and consume, and remaining carbon and manganese play the role of alloying.
Its specific formula for calculation are as follows: carbon dust weight=(X1-X2) × richness manganese molten iron carbon content/(in carbon dust adition process
The rate of recovery of carbon)=(9.5 tons -3.2 tons) × 0.04/0.7=360kg；
Antaciron additional amount=(silicone content in Metal Weight × molten steel subject component)/(silicon in Antaciron contains
The rate of recovery of silicon in amount × Antaciron adition process)=(100 tons × 0.002)/(0.75 × 0.8)=333kg.
The final molten steel that 103 tons of qualified trades mark are made and are 45, property data are shown in Table 3, and molten steel meets national standard, by
Play the role of increasing in molten steel 0.62% manganese in rich manganese molten iron, being computed reduces by 40 yuan/ton of steel of manganese alloy cost.
The property data of converter molten steel in 1 embodiment of table
The property data (wt%) of low-sulfur molten iron used in 2 embodiment of table
The property data (wt%) of molten steel obtained in 3 embodiment of table
Claims (7)
1. a kind of method of manganese content in control molten steel, which is characterized in that include the following steps,
(1) low-phosphorous rich manganese ore fine powder and Bessemer ore fine powder are incorporated in sinter, the matter of low-phosphorous rich manganese ore fine powder in sinter
Measuring percentage is 15~25%；
(2) smelt rich manganese molten iron with above-mentioned sinter in blast fumance, obtain manganese content be 15~25%, carbon content be 3~
5%, iron content is 70~80%, the rich manganese molten iron of P content≤0.07%, S content less than 0.03%, richness manganese iron when blast furnace casting
Temperature >=1500 DEG C of water；
(3) before bessemerizing, it is blended into the molten iron of conventional ingredients into converter, is blown during bessemerizing according to converter steelmaking process
Water is smelted iron, blowing end point temperature >=1670 DEG C of molten steel is controlled, controls blowing end point phosphorus content≤0.017% of molten steel, obtain
Molten steel；
(4) before converter tapping, step (2) the rich manganese molten iron is blended into empty ladle, the rich manganese molten iron amount of being blended into is according to steel grade
In carbon, manganese composition calculated, then open System for Blowing Argon at Bottom；
(5) steel ladle bottom argon blowing valve is transferred to maximum opening in converter tapping process, carries out strong mixing to molten steel, tapping to 1/2~
Silicon alloy is added when 3/4 into molten steel and adds carbon dust or manganese alloy.
2. the method for manganese content in a kind of control molten steel according to claim 1, which is characterized in that described in step (1)
The manufacturing process of low-phosphorous richness manganese ore fine powder are as follows: low-phosphorous richness manganese ore is milled to granularity≤0.038mm in ore dressing process, makes low-phosphorous manganese ore
In phosphate particle separated with manganese ore composition granule, Mn >=50%, P≤0.040% are then obtained after magnetic separation, S≤0.3%
The low-phosphorous manganese ore fine powder.
3. the method for manganese content in a kind of control molten steel according to claim 1, which is characterized in that described in step (1)
The manufacturing process of Bessemer ore fine powder are as follows: low-phosphorous iron ore concentrate is milled to granularity≤0.038mm in ore dressing process, makes low-phosphorous iron ore concentrate
In phosphate particle separated with iron ore composition granule, Fe >=62%, P≤0.07% are then obtained after magnetic separation, S≤0.3%
The Bessemer ore fine powder.
4. the method for manganese content in a kind of control molten steel according to claim 1, which is characterized in that in the step (4)
The calculation method of the rich manganese molten iron amount of being blended into are as follows: according to the carbon content in converter smelting endpoint molten steel composition, Metal Weight, rich manganese iron
The carbon content of water, the target carbometer calculating of steel grade are assigned to the rich manganese iron water amount that target carbon content need to be blended into, and are denoted as X1；According to
Manganese content, Metal Weight, the manganese content of rich manganese molten iron, the target manganese content of steel grade in converter smelting endpoint molten steel composition calculate
It is assigned to the rich manganese iron water amount that target manganese content need to be blended into out, is denoted as X2；Actually being blended into for rich manganese molten iron is smaller in measurement X1, X2 value
One.
5. the method for manganese content in a kind of control molten steel according to claim 4, which is characterized in that
The specific formula for calculation for the rich manganese iron water amount X1 that need to be blended into are as follows: X1=(target carbon content-converter smelting endpoint steel of steel grade
Carbon content in water composition) × Metal Weight/(carbon content-steel grade target carbon content of rich manganese molten iron)；
The specific formula for calculation for the rich manganese iron water amount X2 that need to be blended into are as follows: X2=(target manganese content-converter smelting endpoint steel of steel grade
Manganese content in water composition) × Metal Weight/(manganese content-steel grade target manganese content of rich manganese molten iron).
6. the method for manganese content in a kind of control molten steel according to claim 5, which is characterized in that step is added in (5)
The weight of carbon dust or manganese alloy is as follows:
As X1 < X2, manganese alloy need to be added, weight=(X2-X1) × richness manganese molten iron manganese content/(manganese alloy is added in manganese alloy
In manganese content × manganese alloy adition process in manganese the rate of recovery)；
As X1 > X2, carbon dust need to be added, weight=(X1-X2) × richness manganese molten iron carbon content/(carbon dust was added is added in carbon dust
The rate of recovery of carbon in journey).
7. the method for manganese content in a kind of control molten steel according to claim 4, which is characterized in that in step (3), converter
Before blowing, the amount of being actually loaded into of molten iron is reduced in a upper heat lesser one in X1, X2 value compared with standard charge weight.
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| CN113846204A (en) * | 2021-09-14 | 2021-12-28 | 山东钢铁股份有限公司 | Steel grade smelting cost control method suitable for 120t top-bottom combined blown converter |
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