CN101818229A - Foamed dephosphorization pellet and preparation method thereof - Google Patents
Foamed dephosphorization pellet and preparation method thereof Download PDFInfo
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- CN101818229A CN101818229A CN200910010513A CN200910010513A CN101818229A CN 101818229 A CN101818229 A CN 101818229A CN 200910010513 A CN200910010513 A CN 200910010513A CN 200910010513 A CN200910010513 A CN 200910010513A CN 101818229 A CN101818229 A CN 101818229A
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Abstract
The invention provides a foamed dephosphorization pellet and a preparation method thereof. The pellet consists of the following components: 15 to 40 percent of calcium oxide (CaO), 15 to 40 percent of carbon (C), 20 to 30 percent of ferric oxide (Fe2O3), 1 to 3 percent of sodium oxide (Na2O) and 20 to 40 percent of caustic soda. The preparation method for the pellet comprises the following steps of: preparing limestone, low-sulfur coal powder, iron oxide red and soda ash according to the component content of the foamed dephosphorization pellet, mixing the materials uniformly by using a mixer, then adding a little amount of adhesive into the mixture, and pelleting the mixture by using a disc pelleting machine. The dephosphorization pellet of the invention does not produce pollution to the environment, so the pellet is favorable for environmental protection; the pellet has good dephosphorization effect and is favorable for improving the quality of the steel; and the pellet has little corrosion to a furnace lining, can reduce the using amount of lime fed into the furnace so as to simplify the operation in front of the furnace, and has obvious comprehensive economic benefit.
Description
Technical field
The invention belongs to steelmaking technical field, relate in particular to foamed dephosphorization pellet that Electric furnace steel makings such as a kind of electric arc furnace, LF stove and medium-frequency induction furnace use and preparation method thereof.
Background technology
Modern electric furnace adopts lime to solve the dephosphorization problem, because the lime quality instability, and problem such as particularly the lime activity is low, and effective rate of utilization is low, the lime consumption of electrosmelting is up to ton steel 100～150kg in reality is produced.The increase of the quantity of slag causes problems such as big such as iron and steel stock consumption, that power consumption is high, tap to tap time is long.Because the needs of smelting process slag making and residue adjustment add iron ore, fluorite, carbon dust etc. from the electric furnace charging mouth and also make the execute-in-place task increase the weight of.How to realize electric furnace highly effective, quick, succinct smelting operation, realize the foam slag burialing arc heating, be rapidly heated and simultaneously dephosphorization be modern Electric furnace steel making urgent problem.
Publication number is that the Chinese patent of CN1124780A discloses a kind of iron and steel foam dephosphorizing agent, is characterized in that this dephosphorizing agent is by 7～25% CaF
2, 10～20 BaCO
3, 4～10.5% Na
2CO
3, 42～66% CaCO
3Form with 5～20% FeO,, also can add 0～10% BaSO in this dephosphorizing agent according to the requirement of smelting condition and steel grade
3With 0～7% LiCO
3This dephosphorizing agent can form the foamy slag of lasting stability in early days, but wherein contains CaF
2And Na
2CO
3, cause this dephosphorizing agent in use to exist contaminate environment, erosion furnace lining and cost than problems such as height.
Publication number is that the Chinese patent of CN1290757A discloses a kind of high efficiency dephosphorating pellet for smelting and preparation method thereof, is characterized in that this dephosphorating pellet is is the main lime dephosphorizing agent of forming with CaO, and it consists of: CaO40～70%, FeO10～40%, CaF
28～15%, binding agent 2～6%, and the preparation method of this pelletizing is a die mould behind twice batch mixing, and with 150 ℃～200 ℃ low-temperature bake, soaking time is 24～48 hours again.This dephosphorating pellet fusing point is low, molten speed is fast, active CaO height in the slag, but this dephosphorating pellet does not have foaming component, therefore can not form foamy slag, can not be applied to the slag making of electric arc furnace dephosphorization as dephosphorizing agent.
Summary of the invention
The objective of the invention is to overcome above-mentioned existing Electric furnace steel making with the existing technical problem of dephosphorizing agent, a kind of environmental protection that is beneficial to is provided, dephosphorization effect is good, Electric furnace steel making foamed dephosphorization pellet and preparation method thereof little to lining erosion.
In order to achieve the above object, the present invention adopts following technical scheme:
This foamed dephosphorization pellet is composed of the following components by weight percentage: calcium oxide (CaO): carbon (C) 15%～40%: ferric oxide (Fe 15%～40%,
2O
3): sodium oxide (Na 20%～30%,
2O): caustic soda 1%～3%: 20%～40%.
The used raw material of foamed dephosphorization pellet of the present invention is Wingdale, low-sulfur coal dust, iron oxide red and soda ash; CaO content in the described Wingdale is advisable by weight percentage 〉=45%, is good with 50%～60%; The C content of described low-sulfur coal dust is advisable by weight percentage 〉=90%; Fe in the described iron oxide red
2O
3Content is advisable by weight percentage 〉=85%, is good with 90%～95%.
The preparation method of foamed dephosphorization pellet of the present invention is: Wingdale, low-sulfur coal dust, iron oxide red and soda ash are pressed the component concentration preparation of foamed dephosphorization pellet, and use the mixer mixing, add small amount of binder then, make ball with balling disc.
In order to prevent that foamed dephosphorization pellet from producing splash when adding in the stove, the present invention is controlled at the moisture weight percent of foamed dephosphorization pellet≤and 0.5%, the size control of pelletizing is in the scope of Φ 10～40mm; The granularity of each raw material of the present invention is: Wingdale 0～150 order, low-sulfur coal dust 0～100 order, iron oxide red 0～150 order; Described binding agent can be a bentonite, also can be water glass, and the weight percent of described binding agent is 1%～3% of a total amount.
Beneficial effect of the present invention: 1) since foamed dephosphorization pellet to adopt raw materials such as Wingdale, low-sulfur coal dust and iron oxide red press the component concentration of foamed dephosphorization pellet formulated, each composition material is floride-free material, so in use environment is not produced pollution; 2) this foamed dephosphorization pellet is in the fusing dephosphorizing process, because the reaction of each component can provide competent source of the gas, thereby guarantee to form continuously foamy slag and be beneficial to the submerged arc heating, the dephosphorisation reaction of each component can bring the part heat can for electrosmelting simultaneously, and is favourable persistently overheating about molten steel; 3) adopt this foamed dephosphorization pellet can reduce the quantity of slag, improve dephosphorization rate, adopt the Wingdale slag making, can also accelerate slagging speed, solve the moisture problem that lime is brought molten steel into, help improving the quality of steel; 4) this foamed dephosphorization pellet adopts pellet forming process, its finished product epigranular and have certain intensity, and Pulverization ratio is low in transportation and use, can effectively improve dephosphorization rate.
Embodiment
For further describing the present invention, the present invention will be described in more detail below by embodiment and comparative example.
With granularity is the limestone powder of 0～150 order, CaO content 〉=45%, and granularity is 0～100 order, the low-sulfur coal dust of C content 〉=90%, and granularity is 0～150 order, Fe
2O
3The iron oxide red of content 〉=85% is pressed each proportion of raw materials preparation of table 1 foamed dephosphorization pellet of the present invention, and its corresponding component sees Table 2.
The proportioning raw materials (wt%) of table 1 embodiment of the invention foamed dephosphorization pellet
| Wingdale, % | The low-sulfur coal dust, % | Iron oxide red, % | Soda ash, % | |
| Embodiment 1 | ??33 | ??35 | ??30 | ??2 |
| Embodiment 2 | ??43 | ??29 | ??26 | ??2 |
| Embodiment 3 | ??50 | ??23 | ??23 | ??4 |
| Embodiment 4 | ??57 | ??18 | ??20 | ??5 |
The component (wt%) of table 2 embodiment of the invention foamed dephosphorization pellet
| ??CaO，％ | ??C，％ | ??Fe 2O 3，％ | ??Na 2O，％ | Caustic soda, % | |
| Embodiment 1 | ??16.50 | ??33.12 | ??28.50 | ??1.11 | ??21.69 |
| Embodiment 2 | ??21.50 | ??26.68 | ??24.70 | ??1.12 | ??26.00 |
| Embodiment 3 | ??25.00 | ??21.16 | ??21.85 | ??2.22 | ??29.77 |
| ??CaO，％ | ??C，％ | ??Fe 2O 3，％ | ??Na 2O，％ | Caustic soda, % | |
| Embodiment 4 | ??28.50 | ??16.56 | ??20.16 | ??2.78 | ??32.00 |
Foamed dephosphorization pellet with the inventive method preparation, in 30 tons of ultra-high power electric arc furnaces of certain Iron And Steel Company, use, it is 45# that the test heat is smelted grade of steel, foamed dephosphorization pellet is taked in the adding in batches in bulk oxidation period of fusing, add-on per ton is 10～12kg, through comparing with former smelting technology, its result of use sees Table 3.
Table 3 embodiment of the invention foamed dephosphorization pellet is used for the result of use of electric arc furnace
| Power consumption kw.h/t | Smelting cycle min | [P] % in the molten final proof | Oxidation latter stage [P] % | Ton steel lime consumption kg | |
| Former technology | ??620 | ??230 | ??0.048 | ??0.032 | ??95 |
| Embodiment 1 | ??610 | ??200 | ??0.045 | ??0.028 | ??80 |
| Embodiment 2 | ??550 | ??180 | ??0.030 | ??0.010 | ??70 |
| Embodiment 3 | ??570 | ??190 | ??0.032 | ??0.012 | ??65 |
| Embodiment 4 | ??580 | ??220 | ??0.040 | ??0.021 | ??60 |
The foamed dephosphorization pellet of the present invention's preparation, 260 tons of LF refining furnaces are used in certain Iron And Steel Company, and it is rimming steel that the test heat is handled steel grade, foamed dephosphorization pellet added at the initial stage of moving into, add-on per ton is 5～10kg, and compares in former smelting technology, and its result of use sees Table 4.When foamed dephosphorization pellet of the present invention is applied to the LF stove, require to handle oxygen level in the molten steel greater than 0.06%, and the slag of molten steel jar is thick should be greater than 80mm.
Table 4 embodiment of the invention foamed dephosphorization pellet is used for the result of use of LF stove
| Power consumption kw.h/t ℃ | Handle period m in | Initial [P] % | Terminal point [P]/% | |
| Former technology | ??0.52 | ??45 | ??0.0090 | ??0.0120 |
| Embodiment 1 | ??0.50 | ??43 | ??0.0095 | ??0.0085 |
| Embodiment 2 | ??0.53 | ??44 | ??0.0091 | ??0.0060 |
| Embodiment 3 | ??0.52 | ??44 | ??0.0089 | ??0.0070 |
| Embodiment 4 | ??0.51 | ??43 | ??0.0099 | ??0.0086 |
Show that by the experimental study of foamed dephosphorization pellet of the present invention in electric furnace power consumption does not additionally increase because of the adding of pelletizing, and decreases; Dephosphorization effect is greatly improved; Reduced simultaneously and gone into hearthstone ash consumption, simplified flushing and casting; Overall economic efficiency is obvious.
Claims (8)
1. foamed dephosphorization pellet is characterized in that composed of the following components by weight percentage:
Calcium oxide (CaO) 15%～40%
Carbon (C) 15%～40%
Ferric oxide (Fe
2O
3) 20%～30%
Sodium oxide (Na
2O) 1%～3%
Caustic soda 20%～40%.
2. foamed dephosphorization pellet according to claim 1, the raw material that it is characterized in that described foamed dephosphorization pellet are Wingdale, low-sulfur coal dust, iron oxide red and soda ash.
3. foamed dephosphorization pellet according to claim 2 is characterized in that CaO content 〉=45% in the described Wingdale, C content 〉=90% of described low-sulfur coal dust, the Fe in the described iron oxide red
2O
3Content 〉=85%, more than all be weight percentage.
4. foamed dephosphorization pellet according to claim 3 is characterized in that the CaO content in the described Wingdale is 50%～60%, the Fe in the described iron oxide red
2O
3Content is 90%～95%, more than all be weight percentage.
5. the preparation method of a claim 1,2 or 3 described foamed dephosphorization pellets, it is characterized in that the component concentration preparation of Wingdale, low-sulfur coal dust, iron oxide red and soda ash by foamed dephosphorization pellet, and use the mixer mixing, and add small amount of binder then, make ball with pelletizer.
6. according to the preparation method of the described foamed dephosphorization pellet of claim 5, it is characterized in that moisture weight percent content≤0.5% of described pelletizing, pelletizing is of a size of Φ 10～40mm.
7. according to the preparation method of the described foamed dephosphorization pellet of claim 5, it is characterized in that the granularity of described each raw material is: Wingdale 0～150 order, low-sulfur coal dust 0～100 order, iron oxide red 0～150 order.
8. according to the preparation method of the described foamed dephosphorization pellet of claim 5, it is characterized in that described binding agent is bentonite or water glass, its weight percent is 1%～3% of a total amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910010513A CN101818229A (en) | 2009-02-27 | 2009-02-27 | Foamed dephosphorization pellet and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910010513A CN101818229A (en) | 2009-02-27 | 2009-02-27 | Foamed dephosphorization pellet and preparation method thereof |
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|---|---|
| CN101818229A true CN101818229A (en) | 2010-09-01 |
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|---|---|---|---|
| CN200910010513A Pending CN101818229A (en) | 2009-02-27 | 2009-02-27 | Foamed dephosphorization pellet and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517415A (en) * | 2011-12-08 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | Method for reducing nitrogen content in steel during high-carbon steel production |
| CN102719605A (en) * | 2011-03-30 | 2012-10-10 | 宝山钢铁股份有限公司 | Foamed ball for producing foam slag in process of stainless steel smelting by an electric arc furnace and a manufacture method thereof |
| CN102876845A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultra-low phosphorus steel through applying pre-melting calcium ferrite to refine outside LF (Ladle Furnace) molten steel furnace |
| CN103205536A (en) * | 2013-04-26 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel dephosphorizing agent and semi-steel dephosphorizing method |
| CN111411218A (en) * | 2020-05-15 | 2020-07-14 | 华北理工大学 | Pore-forming composite additive for dephosphorization of high-phosphorus iron ore pellets, addition method and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071703A (en) * | 1991-10-23 | 1993-05-05 | 广西冶金研究所 | High-effective foam slag submerged-arc steel melting method of electric arc furnace |
| CN1290757A (en) * | 2000-09-21 | 2001-04-11 | 钢铁研究总院 | High efficiency dephosphorating pellet for smelting and its preparing method |
-
2009
- 2009-02-27 CN CN200910010513A patent/CN101818229A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071703A (en) * | 1991-10-23 | 1993-05-05 | 广西冶金研究所 | High-effective foam slag submerged-arc steel melting method of electric arc furnace |
| CN1290757A (en) * | 2000-09-21 | 2001-04-11 | 钢铁研究总院 | High efficiency dephosphorating pellet for smelting and its preparing method |
Non-Patent Citations (3)
| Title |
|---|
| 杨治立: "发泡脱磷球团的试验研究", 《重庆科技学院学报（自然科学版）》 * |
| 王力军: "电弧炉炼钢中的脱磷泡沫渣", 《化工冶金》 * |
| 礼重超等: "LF熔渣发泡剂的研究", 《钢铁钒钛》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719605A (en) * | 2011-03-30 | 2012-10-10 | 宝山钢铁股份有限公司 | Foamed ball for producing foam slag in process of stainless steel smelting by an electric arc furnace and a manufacture method thereof |
| CN102517415A (en) * | 2011-12-08 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | Method for reducing nitrogen content in steel during high-carbon steel production |
| CN102876845A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultra-low phosphorus steel through applying pre-melting calcium ferrite to refine outside LF (Ladle Furnace) molten steel furnace |
| CN103205536A (en) * | 2013-04-26 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel dephosphorizing agent and semi-steel dephosphorizing method |
| CN111411218A (en) * | 2020-05-15 | 2020-07-14 | 华北理工大学 | Pore-forming composite additive for dephosphorization of high-phosphorus iron ore pellets, addition method and preparation method thereof |
| CN111411218B (en) * | 2020-05-15 | 2021-07-30 | 华北理工大学 | Pore-forming composite additive for dephosphorization of high-phosphorus iron ore pellets, addition method and preparation method thereof |
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Application publication date: 20100901 |