CN1778973A - Composite ferromanganese mineral ball for steelmaking - Google Patents
Composite ferromanganese mineral ball for steelmaking Download PDFInfo
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- CN1778973A CN1778973A CN 200410065593 CN200410065593A CN1778973A CN 1778973 A CN1778973 A CN 1778973A CN 200410065593 CN200410065593 CN 200410065593 CN 200410065593 A CN200410065593 A CN 200410065593A CN 1778973 A CN1778973 A CN 1778973A
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Abstract
A ferromanganese mineral ball compound for steel-making which consists of 50%-60%of manganese oxide ore, 20%-25%of iron powder ore, 10%-20%of dolomite powder, 4%-6%of silicon powder and 4%-6% of agglomerant by weight percentage. All of these components are mixed and press forming. Advantages of this compound are lower production cost, higher product capability and higher slag-melting efficiency so as to increase manganses content by the end-point of steel-making and to reduce smelting cost. It also simplifies charging technique and makes deprivation of (P), (S), (Si)from steel easier. This environmental protective compound can be widely used as refrigerant and slag-melting agent in slagging process in electric steelmaking and pneumatic steelmaking and can be used to improve manganese use ratio.
Description
Technical field
The present invention relates to a kind of steel-making slag making ore deposit ball, particularly relate to the composite ferromanganese mineral ball for steelmaking that contains manganese, iron mineral raw material, can be widely used in the slagging process of Electric furnace steel making, converter steelmaking and use as refrigerant, dissolving agent and part substituted for silicon manganese alloy.
Background technology
The main task of electrosmelting oxidation period is slag making as early as possible, change slag; The main task of bessemerizing early stage is to take off (P), and the precondition of taking off (P) is that good slag will be arranged.The raw material of optimal promotion slag is a fluorite, because environmental protection requirement, and the fluorite use that in steel-making, has been under an embargo.
At present steel mill generally adopts iron scale, the ore raw material as promotionizations slag, but because the iron scale activity is bigger, add-on is not easy control, excessively then causes splash in earlier stage easily, and too small then slag melts bad; And the ore burn-off rate is slow, and it is long to change the slag time, changes the slag DeGrain.Therefore, steel mill presses for and seeks that a kind of cost is low, performance good, is beneficial to environmental protection and adding technology and simply makes steel and use slag former, changes slag as early as possible and in time adjust slag composition in slagging process when slag " returns dried ".
In addition, in steelmaking process, need to add an amount of manganeseirom, and therefore the price height of manganeseirom seeks the alternative cheap raw material that can reduce the manganeseirom add-on, just seem highly significant for reducing smelting cost.
Summary of the invention
Purpose of the present invention is exactly at the above-mentioned problems in the prior art, and provide that a kind of production cost is low, good product performance, change slag speed are fast, be easy to environmental protection, can improve the residual manganese content of steel-making terminal point, reduce smelting cost, and help the composite ferromanganese mineral ball for steelmaking that removes of (P) in the steel, (S), (Si).
For achieving the above object, the present invention adopts following technical scheme:
Composite ferromanganese mineral ball for steelmaking of the present invention is to be prepared from through mixing, compression moulding according to following component content by manganese oxide powder, fine iron ore, ground dolomite, silica flour, binding agent:
Manganese oxide powder: 50%-60% (weight);
Fine iron ore: 20%-25% (weight);
Ground dolomite: 10%-20% (weight);
Silica flour: 4%-6% (weight).
Binding agent: 4%-6% (weight).
The Mn grade of described manganese oxide powder 〉=20% is advisable, and is good between 25%-30%; The iron grade of described fine iron ore is between TFe45%-50%; Described binding agent is that the smart composite prod with gypsum, bubble flower alkali etc. in lake is good.
After each component of composite ferromanganese mineral ball for steelmaking of the present invention is mixed according to the general method mixing, adding an amount of water stirs, make it to become moist powdery, this moist powder mix input ball press is suppressed, become the real ball of definite shape and size, and by becoming goods after dehumidification system oven dry, the screening plant screening.The particle diameter of its finished product is 40-60mm.
For guaranteeing mixing of material, and making the real ball after the moulding that intensity and slag making performance preferably be arranged, the granularity of several components of composite ferromanganese mineral ball for steelmaking of the present invention is good according to following requirement: manganese oxide powder 0-2mm, fine iron ore 0-3mm, ground dolomite 0-2mm, silica flour 0-2mm.
The Commercial application of composite ferromanganese mineral ball for steelmaking of the present invention shows, after the present invention adopts technique scheme, has the following advantages:
For Electric furnace steel making: 1. after melting period finishes, add a ton steel 10Kg-20Kg composite ferromanganese mineral ball with the slag making material, (MnO) in the composite ferromanganese mineral ball can reduce the temperature of fusion of slag, fully dwindles Ca
2SiO
4, Ca
3SiO
4Phase region, make slag in very wide temperature range, keep evenly liquid, because form low-melting tephroite in the slag.According to research, to containing the slag of 1% (MnO), open to blow a large amount of C just appearred in back 3.5 minutes
2S, C
3S, and (MnO) reached at 15% o'clock in the first slag, C then just occurred at 6-7 minute
2S, C
3S is so high (MnO) slag can delay C
2S, C
3The generation of S, making slag speed is obviously accelerated, and adds back slagging rapidly.2. can prevent effectively in smelting process that slag from " returning dried ", suitably add some composite ferromanganese mineral balls in the electric furnace and can control slag viscosity and (FeO) content smelting the middle and later periods, make slag have certain activity all the time, be in low melting range.Even slag " returns dried ", this is suitably to add some composite ferromanganese mineral balls, the rapid slagging of slag meeting, and also this slag former activity is lower, also can not cause slag foaming suddenly to cause splash.3. when phosphoretic steel was hanged down in blowing, added composite ferromanganese mineral ball and can effectively improve dephosphorization rate early stage, stablizes and improved the reductor and the yield of alloy of low phosphoretic steel.4. owing to added composite ferromanganese mineral ball promotionization slag, splash reduces, thereby has reduced iron and steel stock consumption.5. add composite ferromanganese mineral ball, make [MnO] content raising in the slag, residual manganese content raises in the steel because the reduction of (MnO) makes when blow end point, can reduce the add-on of manganeseirom, reduces consuming, the saving cost.6. [Mn] content increases in the steel, makes [O] reduction in the steel, promotes desulfurization; MnO content improves in the slag, and slag fluidity is improved, and helps desulfurization.
Same reason is for converter steelmaking: 1. add a ton steel 10Kg-20Kg composite ferromanganese mineral ball in the blowing beginning in 2 minutes, change slag speed and obviously accelerate, add back slagging rapidly; The early stage add composite ferromanganese mineral ball in blowing and can improve converter and take off [P] rate, it is about 2% that converter [P] rate of taking off can improve, and converter terminal [P] can reduce about 5%; Be both, because (FeO), (CaO) also are that the prerequisite of (Si) is taken off in converter, thereby the adding of composite ferromanganese mineral ball also helps removing of (Si) in the steel.2. can prevent effectively in converting process that slag from " returning dried ", suitably add some composite ferromanganese mineral balls in the converter in the blowing middle and later periods and can control slag viscosity and (FeO) content, make slag have certain activity all the time, be in low melting range.Even slag " returns dried ", this is suitably to add some composite ferromanganese mineral balls, the rapid slagging of slag meeting, and also this slag former activity is lower, also can not cause slag foaming suddenly to cause splash.3. when phosphoretic steel is hanged down in blowing, add composite ferromanganese mineral ball and can effectively improve dephosphorization rate early stage, obviously reduced the generation of Molten Steel over-oxidation, and activity oxygen on average can reduce about 50ppm in the tapping steel, owing to the reduction of activity oxygen, stablize and improved the reductor and the yield of alloy of low phosphoretic steel simultaneously.4. owing to added composite ferromanganese mineral ball promotionizations slag and dephosphorization, converter splash minimizing, thereby effectively reduced the damage of blowing of converter, converter blow damage can reduce about 0.2%, thereby reduced iron and steel stock consumption.5. blowing adds composite ferromanganese mineral ball in earlier stage, can reduce the oxidation of (Mn) in the converting process, improve residual (Mn) amount in the terminal point steel, residual manganese content makes (MnO) content raising in the slag in the terminal point steel, when blow end point since the reduction of (MnO) that residual in the steel (Mn) content can be increased is about 10%, reduce the consumption of manganeseirom.6. (Mn) content increases in the steel, makes (O) reduction in the steel, promotes desulfurization; (MnO) content improves in the slag, and slag fluidity is improved, and helps desulfurization.
The add-on of manganese oxide powder directly influences the manganeseirom replacement amount in the steel-making in the composite ferromanganese mineral ball for steelmaking of the present invention.Manganeseirom replacement amount in the too small then steel-making reduces; The excessive add-on that has influence on other component again.
The add-on of fine iron ore just has influence on the change slag effect in the steelmaking process in the composite ferromanganese mineral ball for steelmaking of the present invention.Add-on is too small then changes slag speed weak effect, also is unfavorable for removing of (P) in the steel; The excessive add-on that has influence on other component again.And the height of the iron grade of the manganese grade in the manganese oxide powder, fine iron ore also has influence on itself add-on and tooling cost of the present invention and effect.
Embodiment
For further describing the present invention, below in conjunction with embodiment and comparative example the present invention is described in more detail, but the present invention is not limited only to these examples, can be below or above embodiment as the manganese grade of manganese oxide powder, the iron grade of fine iron ore.
With particle diameter is the manganese oxide powder of the Mn20%-30% of 0-2mm, fine iron ore that particle diameter is the TFe45%-50% of 0-3mm, particle diameter is 0-2mm ground dolomite, silica flour that particle diameter is 0-2mm, binding agent according to the grade shown in the table 1 (Mn%, TFe%), each component concentration (weight %) preparation composite ferromanganese mineral ball for steelmaking of the present invention:
Table 1
Each component of composite ferromanganese mineral ball for steelmaking of the present invention according to the general method mixing after, adding an amount of water stirs, make it to become moist powdery, this moist powder mix input ball press is suppressed, become the real ball of definite shape and size, and by becoming goods after dehumidification system oven dry, the screening.Its concrete preparation technology is:
Be placed in the mixing machine manganese oxide powder is levigate; Proportioning according to the foregoing description stirs manganese oxide powder, fine iron ore, ground dolomite, silica flour in mixing machine, become a kind of mixing powdery; Binding agent is added in the mixing powder-material, add an amount of water again and continue to stir, make it to become moist powdery; This moist powder-material input ball press is suppressed, become the real ball of certain present situation and size, and by dehumidification system oven dry, screening plant screening becoming finished product.Particle diameter Φ 50mm 〉=90% of its finished product, water ratio 5-9%, intensity 〉=800 newton/.The finished product are sold according to 15Kg/ bag-30Kg/ bag packing.
With the composite ferromanganese mineral ball for steelmaking (ball) of table 1 proportioning and above-mentioned prepared, the practical effect that adds according to the amount of 20Kg/ ton steel sees Table 2.
Table 2
| Embodiment | Product performance and effect | ||||
| Q | α | W | T | P | |
| 1 | 800 | 10.5 | 3.1 | 4.2 | 3.9 |
| 2 | 800 | 13.8 | 4.0 | 7.0 | 8.0 |
| 3 | 820 | 11.9 | 3.3 | 5.2 | 5.3 |
| 4 | 820 | 12.7 | 3.6 | 5.8 | 3.8 |
| 5 | 800 | 12.0 | 3.4 | 5.4 | 3.0 |
| 6 | 800 | 10.2 | 3.0 | 4.0 | 3.5 |
| 7 | 850 | 13.5 | 3.8 | 6.7 | 7.2 |
| 8 | 850 | 13.3 | 3.7 | 6.3 | 6.9 |
In the table 2: Q-intensity (newton /); Residual (Mn) increment rate % in α-terminal point steel; The manganeseirom amount (Kg) that W-ton steel is saved; The T-ization slag speed up tapping time of shortening (minute); P-takes off (P) rate and improves (probable value %).
The composite ferromanganese mineral ball of the present invention's preparation is used in 50 tons of electric furnaces of certain Steel stock Co., Ltd, and with the add-on adding of 20Kg/ ton steel, composite ferromanganese mineral ball is adjusted according to 1200 yuan/ton, and it is direct and indirect economic effect is as follows:
(1) residual (Mn) can increase about 12% in the terminal point steel, reach 0.40-0.50%, can replace the adding of the manganese in the Steel Alloy fully, need not to transfer manganese during tapping, by 70% mid-carbon fe-mn alloy is 10000 yuan of/ton calculating, can save the ton steel cost of about 39 yuan of/ton steel;
(2) the change slag is rapid, has shortened 4-7 minute tapping time;
(3) having reduced iron and steel consumption probable value is the 120-150Kg/ stove;
(4) stable and improved the reductor and the yield of alloy of low phosphoretic steel;
(5) (P) rate of taking off improves probable value 3-8%;
(6) dust is beneficial to the protection environmental protection less, and charging technology is simple, has alleviated working strength of workers.
For converter steelmaking, certain Steel stock Co., Ltd's technique center Study on Process results of measuring show, converter steelmaking adds the composite ferromanganese mineral ball of 20Kg/ ton steel, the residual manganese of blow end point can be improved, the residual manganese content of terminal point can increase 0.15-0.2%, thus reduce manganeseirom consumption.Manganeseirom is according to manganese content 70%, and recovery rate is calculated by 80%, and a ton steel can be saved the 3-4Kg manganeseirom, and composite ferromanganese mineral ball (ball) is according to 980-1200 unit/ton calculating, and manganeseirom is according to 8000 yuan of/ton calculating, cost-saved 10-12 unit/ton steel.
Claims (5)
1. composite ferromanganese mineral ball for steelmaking, it is characterized in that: it is to be prepared from through mixing, compression moulding according to following component content by manganese oxide powder, fine iron ore, ground dolomite, silica flour, binding agent:
Manganese oxide powder: 50%-60% (weight);
Fine iron ore: 20%-25% (weight);
Ground dolomite: 10%-20% (weight);
Silica flour: 4%-6% (weight).
Binding agent: 4%-6% (weight).
2. composite ferromanganese mineral ball for steelmaking as claimed in claim 1 is characterized in that: Mn grade 〉=20% of described manganese oxide powder.
3. composite ferromanganese mineral ball for steelmaking as claimed in claim 2 is characterized in that: the Mn grade of described manganese oxide powder is between 25%-30%.
4. composite ferromanganese mineral ball for steelmaking as claimed in claim 1 is characterized in that: the iron grade of described fine iron ore is between TFe45%-50%.
5. as claim 1,2,3 or 4 described composite ferromanganese mineral ball for steelmaking, it is characterized in that: the size range of described each component is: manganese oxide powder 0-2mm, fine iron ore 0-3mm, ground dolomite 0-2mm, silica flour 0-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410065593 CN1778973A (en) | 2004-11-25 | 2004-11-25 | Composite ferromanganese mineral ball for steelmaking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410065593 CN1778973A (en) | 2004-11-25 | 2004-11-25 | Composite ferromanganese mineral ball for steelmaking |
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| CN1778973A true CN1778973A (en) | 2006-05-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399677A (en) * | 2016-09-27 | 2017-02-15 | 湛江盛宝科技有限公司 | Ferromanganese alloy ball and manufacturing method thereof |
| CN107338364A (en) * | 2017-06-15 | 2017-11-10 | 江苏省冶金设计院有限公司 | A kind of method for preparing ferromanganese pearl |
| CN111411191A (en) * | 2020-05-29 | 2020-07-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for directly alloying manganese ore in semisteel steelmaking converter |
-
2004
- 2004-11-25 CN CN 200410065593 patent/CN1778973A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399677A (en) * | 2016-09-27 | 2017-02-15 | 湛江盛宝科技有限公司 | Ferromanganese alloy ball and manufacturing method thereof |
| CN107338364A (en) * | 2017-06-15 | 2017-11-10 | 江苏省冶金设计院有限公司 | A kind of method for preparing ferromanganese pearl |
| CN111411191A (en) * | 2020-05-29 | 2020-07-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for directly alloying manganese ore in semisteel steelmaking converter |
| CN111411191B (en) * | 2020-05-29 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for directly alloying manganese ore in semisteel steelmaking converter |
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