CN102296153A - Novel premelting dephosphorization agent for steel making and preparation method thereof - Google Patents
Novel premelting dephosphorization agent for steel making and preparation method thereof Download PDFInfo
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- CN102296153A CN102296153A CN2011102407733A CN201110240773A CN102296153A CN 102296153 A CN102296153 A CN 102296153A CN 2011102407733 A CN2011102407733 A CN 2011102407733A CN 201110240773 A CN201110240773 A CN 201110240773A CN 102296153 A CN102296153 A CN 102296153A
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- premelting
- dephosphorizing agent
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Abstract
The invention relates to a novel premelting dephosphorization agent for steel making and a preparation method thereof. The invention aims to provide a highly efficient premelting dephosphorization agent which is suitable for steel making to overcome defects of various dephosphorization materials for converter steel making. The premelting dephosphorization agent comprises, by mass, 25-40% of CaO, 45-65% of Fe2O3, 0.1-10% of BaO, and equal to or less than 5.0% of an impurity (MgO/Al2O3/SiO2), wherein the sum of above mass percentages of above components is 100%, and the granularity of a premelting slag material is 1-100mm. The premelting slag of the invention which has the advantages of uniformity and good stability of the components, low melting point (1210-1260DEG C), proper viscosity (0.01-0.05 Pa.S at 400DEG C), good fluidity, and fast fusing speed is the dephosphorization material for steel making with no fluorine, low melting point, high efficiency of dephosphorization, and stabilization, and the end phosphor content can reach lower than 0.004%.
Description
Technical field
The invention belongs to metallurgical technology field, is a kind of steelmaking process that is used for, and removes phosphorus in the steel, reduces pre-molten dephosphorizing agent of phosphorus content in the molten steel and preparation method thereof.
Background technology
Phosphorus harmful element normally in steel because phosphorous height can make steel produce cold short phenomenon and influences some mechanical propertys of steel in the steel, therefore will strictly be controlled.In conventional art, the phosphorus general requirement in the steel is controlled at below 0.012%, and along with the raising of some steel grade mechanical property requirement standard, the phosphorus in some Clean Steels and the ultra-low phosphoretic steel must be controlled at about 0.005%, or even below 0.003%.For realizing this goal, forward in another converter after steel mill adopts " double slag process " promptly to adopt twice slag making or " two step method " both to take a block converter with dephosphorization of molten iron in converter smelting mostly and smelt.These two kinds of phosphorus removing methods all are that operation is loaded down with trivial details, the treatment time is long, and the tissue of producing to converter has brought difficulty with cooperating of continuous casting.
The method of converter current dephosphorization is mainly interpolation lime and adds flux material.It is generally acknowledged CaF
2To 2CaOSiO
2And 3CaOSiO
2And the quick fusing of lime has important promoter action, also is one of flux material commonly used in the past.But, because CaF
2Human body and environment are had the intensive corrosive nature, and present most of smelters do not re-use.In addition, in order to improve the FeO concentration in the slag, all adopt the mode of Fe element in the oxygen blast oxidation steel to solve at present.But because the oxidation of Fe element also is thermopositive reaction, temperature of melt metal is raise, also be unfavorable for the carrying out of dephosphorisation reaction.Simultaneously, the method by Fe in the oxidation steel improves FeO in the slag also can make recovery rate of iron reduce.Anshan iron and steel plant converter now mainly uses iron sheet ball (other inorganic materials of steel rolling iron phosphorus, the heavy mud of iron content, converter dust-removing ash is formed) to carry out dephosphorization, but utilizes this method slag effect undesirable.In view of the various shortcoming of above dephosphorization dissolving agent, researching and developing novel floride-free steel-making is present steelmaker author's a main task with pre-molten dephosphorization dissolving agent.
It is the main iron scale class dissolving agent of forming with FeO that Chinese patent (patent No. 99112573.8) discloses a kind of, it consists of: iron scale 70～90%, ironmaking mud 5～25%, binding agent 1～5%, with raw material pulverizing, configuration, mixing and suppress balling-up, iron scale class dissolving agent slag effect is comparatively remarkable, but exists serious to lining erosion, make the molten steel temperature drop big, action time weak point can not the ensured sustained development slag etc. problem.
Dephosphorising agent for converter and preparation method thereof 200610026164.7 the present invention relates to a kind of Dephosphorising agent for converter and preparation method thereof, it is characterized in that this Dephosphorising agent for converter is made up of following component by weight percentage: ferric oxide (Fe
2O
3) 40%～60%, calcium oxide (CaO) 30%～50%, alchlor (Al
2O
3) 1%～10%, silicon-dioxide (SiO
2) 1%～10%, magnesium oxide (MgO) 0.1%～10%, the component of above-mentioned Dephosphorising agent for converter is pulverized, is mixed, through 1000 ℃～1550 ℃ fritting, generate the iron calcium aluminate, the cooling post-treatment becomes the granular Dephosphorising agent for converter of 3～50mm.The present invention is to provide the coverter pig dephosphorizing agent, require, contain alchlor (Al from composition
2O
3) 1%～10%, silicon-dioxide (SiO
2) 1%～10%, magnesium oxide (MgO) 0.1%～10%, certainly will influence basicity of slag, reduce dephosphorization efficient.
Goal of the invention
A kind of novel steel-making of the present invention provides a kind of suitable efficiently steel-making and uses the pre-molten dephosphorizing agent with pre-molten dephosphorizing agent and preparation method thereof, purpose, overcomes the defective that above-mentioned various converter steelmaking dephosphorization material exists.Create floride-free fusing point low and high efficiency dephosphorating and stable steel-making dephosphorization material, terminal point phosphorus all can reach below 0.004%.
Summary of the invention
In order to achieve the above object, the present invention adopts following technical scheme:
1, a kind of novel steel-making pre-molten dephosphorizing agent of the present invention, its composition and mass percent are:
CaO：25％～40％，Fe
2O
3：45％～65％，BaO：0.1～10％
Other impurity (MgO Al
2O
3SiO
2)≤5.0%.
More than each constituent mass per-cent sum be 100%;
This pre-melted slag material granularity is 1～100mm.
The uniform and stable property of the composition of pre-melted slag of the present invention is good, has low melting point (1210 ℃～1260 ℃), viscosity suitable (1400 ℃ the time, 0.01～0.05PaS), good fluidity, burn-off rate is fast; Also contain 0.1～10% BaO in addition in the slag, the adding of this kind basic oxide can significantly improve the pre-melted slag phosphate capacity; The fritting slag charge be block (granularity: 1～100mm), surface tension is little, can be rapidly in the use is invaded, melts by molten steel is molten, no dust pollution in the use, utilization ratio, recovery rate height are the low and high efficiency dephosphorating materials of a kind of real floride-free fusing point, have good energy-conservation and environment protecting.
2, the above-mentioned novel steel-making of the preparation method of pre-molten dephosphorizing agent, form by following steps:
(1) batching
The process for preparation of slag is with the raw material weighing and burden by slag composition.The raw material that this pre-melted slag uses is granule lime, scale oxide, barium carbonate pulvis.Granule lime composition is CaO 〉=90%, P
2O
5＜0.005%; The Phosphorus material of ferric oxide (mainly comprising steel rolling iron phosphorus, the heavy mud of iron content, converter dust-removing ash) Fe
2O
3〉=90%, P
2O
5＜0.005%; Barium carbonate pulvis BaCO
3〉=99%.
(2) raw material crushing
With above-mentioned raw materials through being crushed to 150 orders.
(3) batch mixing
Raw material after the fragmentation is put into mixer batch mixing 30min, make its abundant mixing.
(4) heating and melting
Mixed raw material is packed in the process furnace, be warming up under 1400 ℃ of-1550 ℃ of high temperature, and continue for some time and make its complete fusion, guarantee that slag composition is even, air cooling obtains the fritting clinker to room temperature afterwards.
(5) fragmentation
The fritting clinker is broken into the particle that granularity is 1～100mm.
Use this pre-molten dephosphorizing agent and carry out deep dephosphorization on tile stove, its dephosphorization rate can reach more than 90%, can make that phosphorus element content effectively is controlled at below 0.004% in the steel.Compare with original technology, the invention has the beneficial effects as follows: dephosphorization efficient is high and stable, is the low and high efficiency dephosphorating material of a kind of real floride-free fusing point, can not corrode furnace lining, environmentally safe; Use this dephosphorizing agent can also reduce lime consumption in addition, reduce the oxygen consumption, saves energy has also reduced iron and steel stock consumption simultaneously, has improved recovery rate of iron.
Description of drawings
(the pre-melted slag mass percent is formed: CaO, 35.2%, Fe in Fig. 1: embodiment 3 pre-molten dephosphorizing agent thing phase composites
2O
3: 59.6%, BaO:4.8%, other impurity (MgO Al
2O
3SiO
2): 0.4%)
Embodiment
Embodiment:
To mix by a certain percentage with barium carbonate powder after granule lime, the scale oxide fragmentation, put into mixer batch mixing 30min, put into process furnace then raw material is heated to 1500 ℃ of fusings, keep 20min to guarantee that slag composition is even, the melting slag air cooling to room temperature, is broken into frit the fritting clinker that granularity is 10～50mm at last.
This steel-making sees the following form with the mass percent composition of pre-molten dephosphorizing agent.
The mass percent of table 1 pre-molten dephosphorizing agent is formed %
| Embodiment | CaO | Fe 2O 3 | BaO | Other impurity |
| Embodiment 1 | 35.2 | 59.6 | 4.8 | 0.4 |
| Embodiment 2 | 31.3 | 63.1 | 2.7 | 2.9 |
| Embodiment 3 | 39.5 | 51.4 | 8.3 | 0.8 |
| Embodiment 4 | 30.5 | 64.5 | 0.3 | 4.7 |
Use this pre-molten dephosphorizing agent and carry out the deep dephosphorization test, test is carried out in 100 tons of converters of certain steel mill, and deoxidation the results are shown in Table 2.
Table 2 is used pre-molten dephosphorizing agent deep dephosphorization result
Claims (5)
1. a pre-molten dephosphorizing agent is characterized in that, its composition and mass percent are: CaO:25%～40%, Fe
2O
3: 45%～65%, BaO:0.1～10%, other impurity≤5.0%, above-mentioned each constituent mass per-cent sum is 100%;
2. pre-molten dephosphorizing agent as claimed in claim 1 is characterized in that: its fusing point is 1210 ℃～1260 ℃.
3. pre-molten dephosphorizing agent as claimed in claim 2 is characterized in that: its viscosity in the time of 1400 ℃ is 0.01～0.05PaS.
4. the preparation method of pre-molten dephosphorizing agent as claimed in claim 1 is characterized in that:
(1) raw material
Adopt granule lime, scale oxide, barium carbonate pulvis as raw material;
(2) raw material crushing
Above-mentioned raw materials is crushed to 150 orders;
(3) batch mixing
Proportionally the relation mixing is put into mixer batch mixing 30min with the raw material after the fragmentation, makes its abundant mixing;
(4) heating and melting
Mixed raw material is packed in the process furnace, be warming up under 1400 ℃ of-1550 ℃ of high temperature, and continue for some time and make its complete fusion, guarantee that slag composition is even, air cooling obtains the fritting clinker to room temperature afterwards;
(5) fragmentation
The fritting clinker is broken into the particle that granularity is 1～100mm.
5. the preparation method of pre-molten dephosphorizing agent as claimed in claim 4 is characterized in that: in the described raw material, granule lime composition is CaO 〉=90%, P
2O
5＜0.005%; Fe in the ferric oxide phosphate material
2O
3〉=90%, P
2O
5＜0.005%; BaCO in the barium carbonate pulvis
3〉=99%.
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|---|---|---|---|
| CN2011102407733A CN102296153A (en) | 2011-08-22 | 2011-08-22 | Novel premelting dephosphorization agent for steel making and preparation method thereof |
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|---|---|---|---|
| CN2011102407733A CN102296153A (en) | 2011-08-22 | 2011-08-22 | Novel premelting dephosphorization agent for steel making and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732680A (en) * | 2012-07-20 | 2012-10-17 | 郑彦 | Pre-smelting type iron calcium aluminate complex dreg dephosphorizing agent as well as preparation and application methods thereof |
| CN102776324A (en) * | 2012-06-28 | 2012-11-14 | 辽宁中汇环保科技有限公司 | Iron-calcium premelting-type dephosphorizing gent for steelmaking and preparation method thereof |
| CN102787212A (en) * | 2012-06-28 | 2012-11-21 | 辽宁中汇环保科技有限公司 | Steel-making dephosphorization agent and preparation method thereof |
| CN102787197A (en) * | 2012-06-28 | 2012-11-21 | 辽宁天和科技股份有限公司 | High-efficiency slagging and dephosphorization agent and preparation method thereof |
| CN102876840A (en) * | 2012-06-28 | 2013-01-16 | 辽宁中汇环保科技有限公司 | Steelmaking siliceous premelting composite deoxidation and desulfurization agent and preparation method thereof |
| CN102876850A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Pre-melting slag former for steel production and production method thereof |
| CN106316421A (en) * | 2016-08-18 | 2017-01-11 | 新化县腾宇炉料有限公司 | Efficient energy-saving magnesian ramming material prepared by recycling waste magnesite brick materials of cement plant and preparation technology |
| CN107130085A (en) * | 2017-04-07 | 2017-09-05 | 天津瑞利鑫环保科技有限公司 | It is a kind of suitable for high efficiency dephosphorating accelerator of pneumatic steelmaking and preparation method thereof |
| CN108588337A (en) * | 2018-06-07 | 2018-09-28 | 上海应用技术大学 | A kind of nanometer dephosphorization slag former and preparation method thereof suitable for middle high phosphorus molten steel |
Citations (2)
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|---|---|---|---|---|
| CN85105347A (en) * | 1985-07-05 | 1986-12-31 | 李观素 | The dephosphorization novel process of high mangaenese steel and high quality steel |
| CN1600872A (en) * | 2004-10-26 | 2005-03-30 | 上海彭浦冶金辅料有限公司 | Dephosphorising agent for converter and preparation method |
-
2011
- 2011-08-22 CN CN2011102407733A patent/CN102296153A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105347A (en) * | 1985-07-05 | 1986-12-31 | 李观素 | The dephosphorization novel process of high mangaenese steel and high quality steel |
| CN1600872A (en) * | 2004-10-26 | 2005-03-30 | 上海彭浦冶金辅料有限公司 | Dephosphorising agent for converter and preparation method |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776324A (en) * | 2012-06-28 | 2012-11-14 | 辽宁中汇环保科技有限公司 | Iron-calcium premelting-type dephosphorizing gent for steelmaking and preparation method thereof |
| CN102787212A (en) * | 2012-06-28 | 2012-11-21 | 辽宁中汇环保科技有限公司 | Steel-making dephosphorization agent and preparation method thereof |
| CN102787197A (en) * | 2012-06-28 | 2012-11-21 | 辽宁天和科技股份有限公司 | High-efficiency slagging and dephosphorization agent and preparation method thereof |
| CN102876840A (en) * | 2012-06-28 | 2013-01-16 | 辽宁中汇环保科技有限公司 | Steelmaking siliceous premelting composite deoxidation and desulfurization agent and preparation method thereof |
| CN102876850A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Pre-melting slag former for steel production and production method thereof |
| CN102732680A (en) * | 2012-07-20 | 2012-10-17 | 郑彦 | Pre-smelting type iron calcium aluminate complex dreg dephosphorizing agent as well as preparation and application methods thereof |
| CN106316421A (en) * | 2016-08-18 | 2017-01-11 | 新化县腾宇炉料有限公司 | Efficient energy-saving magnesian ramming material prepared by recycling waste magnesite brick materials of cement plant and preparation technology |
| CN106316421B (en) * | 2016-08-18 | 2020-06-16 | 新化县腾宇炉料有限公司 | Efficient energy-saving magnesium ramming mass prepared by recycling waste magnesium brick material of cement plant and preparation process |
| CN107130085A (en) * | 2017-04-07 | 2017-09-05 | 天津瑞利鑫环保科技有限公司 | It is a kind of suitable for high efficiency dephosphorating accelerator of pneumatic steelmaking and preparation method thereof |
| CN108588337A (en) * | 2018-06-07 | 2018-09-28 | 上海应用技术大学 | A kind of nanometer dephosphorization slag former and preparation method thereof suitable for middle high phosphorus molten steel |
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Application publication date: 20111228 |