CN102787212A - Steel-making dephosphorization agent and preparation method thereof - Google Patents
Steel-making dephosphorization agent and preparation method thereof Download PDFInfo
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- CN102787212A CN102787212A CN2012102263642A CN201210226364A CN102787212A CN 102787212 A CN102787212 A CN 102787212A CN 2012102263642 A CN2012102263642 A CN 2012102263642A CN 201210226364 A CN201210226364 A CN 201210226364A CN 102787212 A CN102787212 A CN 102787212A
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Abstract
The invention puts forward a steel-making dephosphorization agent and a preparation method thereof. Raw materials of the dephosphorization agent mainly comprise industrial waste rich in calcium oxide and iron oxide. The preparation method thereof comprises preparing the raw materials, crushing, mixing, stirring, smelting at a high temperature of 1500 to 1550 DEG C, cooling crystallization after melting and tapping, breaking to mold, and obtaining the calcium ferrite dephosphorization agent rich in CaO and Fe2O3 and having a particle size of 5 to 40 mm, wherein the prepared steel-making dephosphorization agent has a main phase of 2Cao.Fe2O3, a melting point of not more than 1280 DEG C, the melting point having a small fluctuation range, stable components, and a variety of equivalent physical and chemical indexes to steel-making dephosphorization agents prepared from high-purity materials. According to the invention, the method is low in production cost, and the product is stable in quality, pollution-free and easy to store. The method is beneficial to popularization and development of a dephosphorization technology.
Description
Technical field
The invention belongs to metallurgical technology field, relate in particular to a kind of dephosphorizing agent and adopt its method of rejected material preparation of making steel.
Background technology
As everyone knows, 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 be controlled.In the conventional art, the phosphorus general requirement in the steel is controlled at below 0.012% at present, and the phosphorus in some Clean Steels and the ultra-low phosphoretic steel must be controlled at about 0.005%, or even below 0.003%.So produced different dephosphorization technologies, like " double slag process " or " two step method " or the like; And multiple dephosphorization material, like CaO-Fe
2O
3-Al
2O
3System and CaO-Fe
2O
3It is flux extra furnace dephosphorization agent.Along with popularizing of dephosphorizing technology, the consumption of dephosphorization material also constantly increases.The existing plurality of specifications of dephosphorizing agent that is used for converter steelmaking at present.Disclosed in the prior art heterogeneity, composition and preparing method's dephosphorizing agent is also quite a lot, and these dephosphorization materials all have certain dephosphorization effect, but all in various degree have that fusing point fluctuation is big, fluorine content is higher and problem such as dephosphorization effect instability.Wherein Calcium Fluoride (Fluorspan) content is generally between 4.0%～10.%.The environmental requirement of this and increasingly stringent is extremely inharmonious.In multiple dephosphorization material, the dephosphorization effect of the calcareous dephosphorizing agent of pre-molten ferrous acid obtains general approval.
Moreover above-mentioned various dephosphorization materials are general all by purer feedstock production, so production cost is higher.Higher production cost is unfavorable for popularizing and development of dephosphorizing technology, and therefore research adopts the calcareous dephosphorizing agent of low-cost raw material production pre-molten ferrous acid just to have significance.
Summary of the invention
The objective of the invention is to select for use low cost raw material, to reduce the production cost of dephosphorization material.Under the prerequisite that guarantees stable components, low fluorine, lower melting point, high dephosphorization efficient, the calcareous dephosphorizing agent of preparation pre-molten ferrous acid, and then promote popularizing of steel-making dephosphorization technology.
In order to reach the foregoing invention purpose, technical scheme of the present invention is following, and the preparation method of this dephosphorizing agent may further comprise the steps:
The first step: prepare raw material, raw material comprises the material that is rich in quicklime, is rich in red stone.Discarded calcareous ash) wherein, the material that is rich in quicklime in the raw material is that carbide slag, calcium lime powder, paper white sludge, calcium powder, limestone kiln dedusting ash, screen underflow (are called for short: the various trade wastes that are rich in quicklime such as; The material that is rich in red stone is trade wastes such as the iron sheet that is rich in red stone, steel rolling and the continuous casting iron scale that produce in the Industrial processes, dirt mud; And not only be rich in quicklime but also be rich in the material of red stone, like desulfurizing iron dedusting ash, blast furnace dedusting ash etc.
Second step: raw material is carried out break process, become the powder-material that granularity is 0～2.0mm;
The 3rd step: mix; With the raw material after the fragmentation in second step according to the weight percent of the material that is rich in quicklime be 30%～70%, the material weight per-cent that is rich in red stone is 50%～98% to mix, and guarantees that composition in the mixed batch mixing is by weight comprising: Fe
2O
3: 50%～80%, CaO:10%～40%, Al
2O
31.5%～3.5%, SiO
21.5%～3.0%.After adopting forced mixer to stir after mixing, be delivered in the smelting furnace;
The 4th step: melting, mixed raw materials is added in the high temperature melting furnace, carry out melting for 1500～1550 ℃ in temperature;
The 5th step: come out of the stove post crystallization cooling of fusion;
The 6th step: broken moulding, through broken, process and be rich in CaO and Fe
2O
3, granularity is the calcareous dephosphorizing agent of ferrous acid of 5～40mm grain piece, the steel-making dephosphorizing agent after the preparation is with 2CaOFe
2O
3Be principal phase, and stable components, the various physical and chemical indexs all steel-making dephosphorizing agent with high-purity material production are suitable, and its composition comprises:
Fe
2O
350％～80％，CaO：10％～40％；
Content of impurities≤10.0%, Al in the impurity
2O
31.5%～3.5%, SiO
21.5%～3.5%, K
2O+Na
2O 1.5%～3.0%, and all the other impurity are MgO, MnO, P and S or the like; And the fusing point of this dephosphorizing agent≤1280 ℃, fluctuation range is little.
The invention has the beneficial effects as follows: with above-mentioned trade waste or sub product is raw material, and the calcareous dephosphorizing agent production cost of preparation pre-molten ferrous acid reduces, constant product quality, pollution-free, be easy to deposit.Form stable calcium ferrite mineral structure through high melt, the product of its physicochemical property and effect and the preparation of employing high pure raw material does not have significant difference.Because production cost reduces, be beneficial to popularizing and development of dephosphorization technology.Simultaneously,, solved it and deposited the problem of difficulty, reduced pollution environment because these waste materials are rationally utilized.
Embodiment
Below, specify the preferred embodiments of the present invention.Need to prove before this; Employed term or word can not limited interpretation be common implication or the implication in the dictionary in this specification sheets and claims, and should be based on being interpreted as implication and the notion that meets technological thought of the present invention for the principle that can suitably define the notion of term with its invention contriver of best mode explanation.Thereupon; The structure of representing among the embodiment that this specification sheets is put down in writing is one of most preferred embodiment of the present invention; Can not represent technological thought of the present invention fully, therefore should be understood that to have various equivalents and the variation that to replace for the present invention.
The steel-making of adopting method of the present invention to produce with six kinds of different material components below uses dephosphorizing agent to explain as example.
Proportioning raw materials is seen table 1:
Table 1 steel-making is with the proportioning raw materials (weight percent) of dephosphorizing agent
The composition of each discarded object sees Table 2 in the table 1:
The composition of table 2 waste (weight percent)
Use the composition of the dephosphorizing agent that method of the present invention prepares to see table 3:
The prepared steel-making of table 3 is with the component (weight percent) and the fusing point of dephosphorizing agent
※ is content of impurities≤5.0% wherein.Said impurity comprises MgO, Al
2O
3, MnO, SiO
2, K
2O and Na
2O etc.
Table 4 is seen in the thing phase composite of the dephosphorizing agent in the foregoing description:
The thing phase composite of product among table 4 embodiment
Code name CF-50 wherein, CF-55, CF-60, CF-65, CF-70, CF-75 are the abbreviation of calcium ferrite, and parameter wherein is Fe
2O
3Weight percent.
Implementation result shows, uses the product composition of method preparation of the present invention stable, and fusing point is lower than 1280 ℃, and phase structure is with 2CaOFe
2O
3Be principal phase, form is the lumpy material of 5-40mm.
Describe and illustrate with reference to embodiment although it should be noted that the present invention, and in embodiment, provided the concrete composition of steel-making dephosphorizing agent and preparing method's concrete steps.But and do not mean that the present invention is limited to the embodiment of these descriptions.Those skilled in the art can therefrom derive many different variants, and they all will be covered in the true spirit and scope of claim of the present invention.
Claims (6)
- One kind steel-making dephosphorizing agent, it is characterized in that: the composition of said steel-making dephosphorizing agent comprises Fe 2O 3: 50%～80%, CaO:10%～40%;Content of impurities≤10.0%, Al in the impurity 2O 31.5%～3.5%, SiO 21.5%～3.5%, K 2O+Na 2O 1.5%～3.0%, and all the other impurity are MgO, MnO, P, S or the like; The fusing point of this dephosphorizing agent≤1280 ℃.
- 2. make steel the preparation method of dephosphorizing agent for one kind, it is characterized in that: the preparation method may further comprise the steps:The first step: prepare raw material, raw material comprises material that is rich in quicklime and the material that is rich in red stone;Second step: raw material is carried out break process;The 3rd step: mix, the raw material after the fragmentation in second step is mixed by a certain percentage;The 4th step: melting, mixed raw materials is added in the high temperature melting furnace, carry out melting for 1400～1450 ℃ in temperature;The 5th step: come out of the stove post crystallization cooling of fusion;The 6th step: broken moulding, through broken, process and be rich in CaO and Fe 2O 3, granularity is the calcium ferrite dephosphorizing agent of 5～40mm grain piece.
- 3. a kind of preparation method who makes steel dephosphorizing agent according to claim 2, it is characterized in that: the material that the raw material in the first step is rich in quicklime is the various trade wastes that are rich in quicklime such as carbide slag, calcium lime powder, paper white sludge, calcium powder, limestone kiln dedusting ash, screen underflow.
- 4. a kind of preparation method who makes steel dephosphorizing agent according to claim 2 is characterized in that: the material that the raw material in the first step is rich in red stone is trade wastes such as the iron sheet that is rich in red stone that produces in the Industrial processes, iron scale, dirt mud.
- 5. according to claim 3 or 4 described a kind of steel-making dephosphorizing agents and preparation method thereof, it is characterized in that: the raw material in second step becomes the powder-material that granularity is 0～2.0mm respectively after break process.
- 6. a kind of steel-making dephosphorizing agent according to claim 5 and preparation method thereof; It is characterized in that: the blending ratio in the 3rd step is that the weight percent that is rich in the material of quicklime is 30%～70%, the material weight per-cent that is rich in red stone is 50%～98%, and the composition in the mixed batch mixing is by weight comprising: Fe 2O 350%～80%, CaO 10%～40%, Al 2O 31.5%～3.5%, SiO 21.5%～3.0%; Mixed after stirrer stirs, be delivered in the smelting furnace.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103880092A (en) * | 2014-03-07 | 2014-06-25 | 西安建筑科技大学 | Method for dephosphorizing ferric oxide powder of regenerated secondary product of pickling waste liquid of iron-steel plant |
| CN103966398A (en) * | 2013-01-30 | 2014-08-06 | 郑州威尔特材有限公司 | Method for producing calcium ferrite from iron oxide |
| CN104593546A (en) * | 2014-09-26 | 2015-05-06 | 洛阳金石再生资源开发有限公司 | Method for preparing premelt calcium ferrite dephosphorization agent |
| WO2015149703A1 (en) * | 2014-04-04 | 2015-10-08 | 四川大学 | Method for preparing calcium ferrite |
| CN107849625A (en) * | 2016-01-05 | 2018-03-27 | 新日铁住金株式会社 | Dephosphorising agent, refining agent and the dephosphorization method of molten iron |
| CN108455678A (en) * | 2018-04-27 | 2018-08-28 | 北京科技大学 | The method that waste material combines the desulfurization of limestone/lime-gypsum method and prepares calcium ferrite |
| CN111036386A (en) * | 2019-12-18 | 2020-04-21 | 攀枝花钢城集团有限公司 | Process for reducing phosphorus content in converter steel slag |
| CN113502366A (en) * | 2021-06-30 | 2021-10-15 | 南京钢铁股份有限公司 | Method for pretreating molten iron |
| CN113832297A (en) * | 2021-10-19 | 2021-12-24 | 北京科技大学 | Red mud-based composite calcium ferrite and preparation method and application thereof |
| CN115572792A (en) * | 2022-10-21 | 2023-01-06 | 河南少林特材有限公司 | Dephosphorization method and application |
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| CN102296152A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel converter steelmaking dephosphorization agent and preparation method thereof |
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| JP2009068074A (en) * | 2007-09-13 | 2009-04-02 | Sanyo Special Steel Co Ltd | Slag-making method in ladle refining for low carbon alloy steel |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966398A (en) * | 2013-01-30 | 2014-08-06 | 郑州威尔特材有限公司 | Method for producing calcium ferrite from iron oxide |
| 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 |
| CN103205536B (en) * | 2013-04-26 | 2015-09-02 | 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 |
| CN103880092A (en) * | 2014-03-07 | 2014-06-25 | 西安建筑科技大学 | Method for dephosphorizing ferric oxide powder of regenerated secondary product of pickling waste liquid of iron-steel plant |
| WO2015149703A1 (en) * | 2014-04-04 | 2015-10-08 | 四川大学 | Method for preparing calcium ferrite |
| CN104593546A (en) * | 2014-09-26 | 2015-05-06 | 洛阳金石再生资源开发有限公司 | Method for preparing premelt calcium ferrite dephosphorization agent |
| CN107849625A (en) * | 2016-01-05 | 2018-03-27 | 新日铁住金株式会社 | Dephosphorising agent, refining agent and the dephosphorization method of molten iron |
| CN108455678A (en) * | 2018-04-27 | 2018-08-28 | 北京科技大学 | The method that waste material combines the desulfurization of limestone/lime-gypsum method and prepares calcium ferrite |
| CN111036386A (en) * | 2019-12-18 | 2020-04-21 | 攀枝花钢城集团有限公司 | Process for reducing phosphorus content in converter steel slag |
| CN113502366A (en) * | 2021-06-30 | 2021-10-15 | 南京钢铁股份有限公司 | Method for pretreating molten iron |
| CN113832297A (en) * | 2021-10-19 | 2021-12-24 | 北京科技大学 | Red mud-based composite calcium ferrite and preparation method and application thereof |
| CN113832297B (en) * | 2021-10-19 | 2022-06-17 | 北京科技大学 | Red mud-based composite calcium ferrite and preparation method and application thereof |
| US20230117352A1 (en) * | 2021-10-19 | 2023-04-20 | University Of Science And Technology Beijing | Red mud-based composite calcium ferrite and preparation method and use thereof |
| US11773025B2 (en) * | 2021-10-19 | 2023-10-03 | University Of Science And Technology Beijing | Red mud-based composite calcium ferrite and preparation method and use thereof |
| CN115572792A (en) * | 2022-10-21 | 2023-01-06 | 河南少林特材有限公司 | Dephosphorization method and application |
| CN115572792B (en) * | 2022-10-21 | 2023-12-19 | 河南少林特材有限公司 | Dephosphorization method and application |
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Application publication date: 20121121 |