CN1300043C - Electric furnace bottom dry ramming mass and its making method - Google Patents
Electric furnace bottom dry ramming mass and its making method Download PDFInfo
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- CN1300043C CN1300043C CNB2004100180759A CN200410018075A CN1300043C CN 1300043 C CN1300043 C CN 1300043C CN B2004100180759 A CNB2004100180759 A CN B2004100180759A CN 200410018075 A CN200410018075 A CN 200410018075A CN 1300043 C CN1300043 C CN 1300043C
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Abstract
The present invention relates to an electric furnace bottom dry ramming material and a preparation method thereof. The electric furnace bottom dry ramming material comprises magnesia calcium iron sand and high purity fused magnesia, wherein the magnesia calcium iron sand comprises 30% to 83% of MgO, 55% to 8.5% of CaO, 1% to 8% of Fe2O3, at most 1.3% of Al2O3, at most 1.5% of SiO2, and at most 3.2% of other materials, the loss on ignition 1L is not high than 1.0%, and the body density is not lower than 2.5 g/cm<3>; the critical size of the high purity fused magnesia is 10mm, and the particle intake is from 0 to 75%. The preparation method is realized through the following steps that the preparation of the magnesia calcium iron sand comprises raw material selection and rotary kiln reburning, wherein the raw material selection of the magnesia calcium iron sand is mentioned above, the temperature of the rotary kiln reburning is from 1700 to 1750 DEG C; the optimal grain composition of the electric furnace bottom dry ramming material is carried out according to the Andreassen formula y=100 (d/D) <q>, and q is commonly from 0.19 to 0.45. The present invention has the advantages that the present invention solves the defects of crack and poor corrosion resistance of too thick sintered layers, sufficiently meets the requirements of 150 tons ultra high power direct-current arc furnace of Baogang and electric steelmaking of foreign steel mills, and creates good economical and social benefits.
Description
Technical field
The present invention relates to a kind of Electric furnace steel making field, relate in particular to a kind of electric furnace furnace bottom dry type ramming material (the novel electric furnace furnace bottom of trade(brand)name: PN-dry type ramming material) and preparation method thereof.
Background technology
Electric furnace steel making is to recycle steel scrap, environmental protection and energy saving, and short flow process steel-making mode rapidly and efficiently, it develops rapidly and has driven MgO-CaO-Fe
2O
3Be the swift and violent research and development of EAF bottom ramming mass and comprehensively universal.For example, 150 tons of ultra high power direct current electric arc furnaces of Baosteel are to introduce from French Clecim company, and capacity is 190 tons, stays 40 tons of operations of steel, and the steel scrap hot metal charging adopts the twin furnace seat to replace the smelting mode, and tapping temperature is at 1600～1650 ℃, and on average the tapping time is 60 minutes.Owing to smelt to produce and adopt top-bottom blowing, the oxygen rifle is fluxed, technology such as foam slag burialing arc, the steel making working procedure ultra high power, fast pace operation, so furnace bottom should reduce overhaul number of times and furnace outage time as far as possible, so just requires electric furnace furnace bottom ramming mass easy construction, but cold repair can be vulcanized, and can drop into immediately after the reparation to smelt and use; Sinter fine and close solid integral body rapidly under middle temperature, at high temperature do not have too many liquid phase again, have the good high-temperature structural strength, the erosion of opposing slag and the impact of steel scrap can stand to smelt batch operation, and promptly heat impact strength is good.
At present, generally all use both at home and abroad and be rich in 2CaOFe
2O
3Magnesia and be rich in 3CaOFe
2O
3Conite matter compound; But the ubiquity sinter layer is blocked up, causes the shortcoming of cracking stirring and anti-melting loss difference.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of electric furnace furnace bottom dry type ramming material and preparation method thereof, are intended to solve above-mentioned defective.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
EAF bottom dry type ramming material of the present invention contains magnesium calcium iron sand, high-purity fused magnesite; Wherein: magnesium calcium iron sand comprises MgO30%～g3%, CaO55%-8.5%, Fe
2O
31%-8%, Al
2O
3≤ 1.3%, SiO
2≤ 1.5%, igloss≤1.0%, impurity≤3.2%, bulk density 〉=2.5g/cm
3The critical granularity of high-purity fused magnesite is 10mm, particle introducing amount 0-75%;
Preparation method of the present invention realizes by following steps:
The preparation of magnesium calcium iron sand comprises: raw material is selected and the rotary kiln reheating; Wherein, raw material selects to comprise MgO30%～83%, CaO55%-2.5%, Fe
2O
31%-8%, Al
2O
3≤ 1.3%, SiO
2≤ 1.5%, igloss≤1.0%, impurity≤3.2%, bulk density 〉=2.5g/cm
3Rotary kiln reheating temperature is between 1700-1750 ℃;
Electric furnace furnace bottom dry type ramming material utilizes Andreassen formula y=100 (d/D)
qCarry out grain composition, the q value gets 0.19～0.45;
Compared with prior art, the invention has the beneficial effects as follows: solved the blocked up and deadly defect of cracking and anti-erosion difference of sintered layer, fully satisfy the requirement that resembles 150 tons of ultra high power direct current electric arc furnaces of Baosteel and external steel mill Electric furnace steel making, created good economic benefit and social benefit.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail:
Embodiment 1
EAF bottom dry type ramming material of the present invention contains magnesium calcium iron sand, high-purity fused magnesite; Wherein: magnesium calcium iron sand comprises MgO30%, CaO55%, Fe
2O
38%, Al
2O
31.3%, SiO
21.5%, igloss 1.0%, impurity 3.2%, bulk density 〉=2.5g/cm
3The critical granularity of high-purity fused magnesite is 10mm, particle introducing amount 0%;
Preparation method of the present invention realizes by following steps:
The preparation of magnesium calcium iron sand comprises: raw material is selected and the rotary kiln reheating; Wherein, raw material is selected to comprise MgO30%, CaO55%, Fe
2O
38%, Al
2O
31.3%, SiO
21.5%, igloss 1.0%, impurity 3.2%, bulk density 〉=2.5g/cm
3Rotary kiln reheating temperature is at 1700 ℃;
Electric furnace furnace bottom dry type ramming material utilizes Andreassen formula y=100 (d/D)
qCarry out grain composition, the q value gets 0.19;
Embodiment 2
EAF bottom dry type ramming material of the present invention contains magnesium calcium iron sand, high-purity fused magnesite; Wherein: magnesium calcium iron sand comprises MgO83%, CaO8.5%, Fe
2O
34.1%, Al
2O
30.45, SiO
20.78, igloss 0.11, impurity 3.06, bulk density 〉=2.5g/cm
3The critical granularity of high-purity fused magnesite is 10mm, particle introducing amount 75%;
Preparation method of the present invention realizes by following steps:
The preparation of magnesium calcium iron sand comprises: raw material is selected and the rotary kiln reheating; Wherein, raw material is selected to comprise MgO83%, CaO8.5%, Fe
2O
34.1%, Al
2O
30.45, SiO
20.78, igloss 0.11, impurity 3.06, bulk density 〉=2.5g/cm
3Rotary kiln reheating temperature is at 1750 ℃;
Electric furnace furnace bottom dry type ramming material utilizes Andreassen formula y=100 (d/D)
qCarry out grain composition, the q value gets 0.45;
Embodiment 3
EAF bottom dry type ramming material of the present invention contains magnesium calcium iron sand, high-purity fused magnesite; Wherein: magnesium calcium iron sand comprises MgO63%, CaO27.6%, Fe
2O
35%, Al
2O
30.9%, SiO
20.8%, igloss 0.5%, impurity 2.2%, bulk density 〉=2.5g/cm
3The critical granularity of high-purity fused magnesite is 10mm, particle introducing amount 45%;
Preparation method of the present invention realizes by following steps:
The preparation of magnesium calcium iron sand comprises: raw material is selected and the rotary kiln reheating; Wherein, raw material is selected to comprise MgO63%, CaO27.6%, Fe
2O
35%, Al
2O
30.9%, SiO
20.8%, igloss 0.5%, impurity 2.2%, bulk density 〉=2.5g/cm
3Rotary kiln reheating temperature is at 1730 ℃;
Electric furnace furnace bottom dry type ramming material utilizes Andreassen formula y=100 (d/D)
qCarry out grain composition, the q value gets 0.30;
Below to raw material selection, raw material and finished product physical and chemical index, Andreassen formula y=100 (d/D)
qRelation and the product example of middle q value and bulk density are described as follows:
1. material choice
From data at home and abroad analysis, MgO-CaO-Fe
2O
3Be the EAF bottom ramming mass generally take fused magnesite and magnesium calcium iron sand as body material, do not contain additive, so the selection of raw material and control just seem particular importance, the especially selection of magnesium calcium iron sand and with the coupling of magnesia addition.By the guidance of phasor, from MgO-CaO-FeO
nTernary phase diagrams is seen, MgO-CaO-FeO
nSeries refractory material is (under the steel-making condition) with the Fe balance time, drops on MgO-CaO-MgO/Fe as long as it forms point
2O
3In the time of in=2.33 the triangle, just liquid phase can not occur under 1600 ℃ condition, it consists of MgO-solid solution or MgO-solid solution+CaO-solid solution, thereby durability is good.
(1) control of Fe2O3: 1. generate liquid phase and form the dense sintering body under middle temperature, its reaction is as follows,
Because the generation of liquid phase has promoted the rapid sintering of furnace bottom ramming mass.
2. at high temperature, C
2F decomposes, Fe
2O
3Become FeO, greatly about 1436 ℃, MgO and FeO form unlimited solid solution, form magnesium Fu Shi body, reach fine and close refractory ceramics combination; Known finished product Fe by phasor
2O
3Should be controlled in 5%, should be controlled at about 7% in the raw material magnesium calcium iron sand;
(2) control of CaO: because FeO
nThan MgO) or the poor durability of CaO a lot, so the material in Al
2O
3, Fe
2O
3, SiO
2Should fully react with CaO Deng impurity, consider simultaneously the Shanghai climate characteristic that there was dampness in the air, adopt no fCaO type MgO-CaO-Fe
2O
3It is the EAF bottom ramming mass.If CaO is too low, just can not be MgO-CaO-Fe
2O
3Be the impurity complete reaction in EAF bottom ramming mass and the molten steel, have eutectic and be not durable; If CaO is too high, can not form good sintering owing at high temperature lack enough liquid phases, cause serviceability to descend.Should be controlled at more than 3 at high-temperature operation MgO/CaO ratio; Under the superhigh temperature operating condition, the MgO/CaO ratio should be controlled at about 9; The saturation degree of CaO is controlled at 1.1Al
2O
3+ 0.7Fe
2O
3+ 2.8SiO
2Scope;
(3) SiO
2Control: from MgO-CaO-SiO
2Ternary phase diagrams sees that the temperature that liquid phase occurs can be not low, but SiO
2Generate 2CaOSiO with the CaO reaction
2And 3CaOSiO
2, can be with the 2CaOFe on periclase surface
2O
3Matter is squeezed away, so that the MgO-CaO fire resistant materials lacks sintering agent and is difficult to sintering.And 2CaOSiO
2Be lower than phase transformation arranged about 1200 ℃:
Volumetric expansion with about 10%～20%, material is broken to loose thereby cause; So the content of silica control SiO in the raw material calcium magnesite
2≤ 1.5%, control SiO in the product
2≤ 1.5%;
(4) Al
2O
3Control:
At C
4Under the condition that AF exists, so that the lowest total of the melting point of MgO-CaO drops to 1320 ℃ from 2300 ℃, and be to stablize liquid phase, can not form solid solution, greatly reduce the corrosion resistance of material, MgO-CaO-FeO
nShould control Al in the matter compound
2O
3＜1.3%;
(5) magnesium calcium iron sand preparation technology's selection
Magnesium calcium iron sand preparation technology adopts 1700～1750 ℃ of rotary kilns heavily to burn, and kiln temperature is even, and it is good that material for making clothes composition and burning till, high temperature burn till densification.The down-draft kiln non-uniform temperature, material composition control is difficult.We use magnesium calcium iron sand furnace life 1450 stove of Shandong one down-draft kiln factory, and magnesium calcium iron sand furnace life of using now that Liaoning factory rotary kiln heavily burns is greater than 1650 stoves, the highest 1900 stoves.So, our fix a point magnesium calcium iron sand of using Liaoning factory rotary kiln heavily to burn.
2. raw material and finished product physical and chemical index
In sum, be used in combination the environment concrete condition, we control raw material and finished product index such as following table (%)
| MgO% | CaO% | Fe 2O 3% | Al 2O 3% | SiO 2% | IL% | Bulk density g/cm 3 | Other wood property % | |
| Magnesium calcium iron | 30～83 | 2.5～55 | 1～8 | ≤ 1.3 | ≤ 1.5 | ≤ 1.0 | 〉=2.50 | 0-1 |
| Finished product | 〉=55 | 0～30 | 0～12.5 | ≤ 1.6 | ≤ 2.0 | ≤ 1.0 | 〉=2.30 | 0-1 |
3.Andreassen formula y=100 (d/D)
qThe relation of middle q value and bulk density
Critical granularity is 10mm, relation such as the following table of the bulk density of finished product and q value:
| The q value | 0.19 | 0.24 | 0.29 | 0.34 | 0.39 | 0.45 |
| Finished-product volume density g/cm 3 | 2.43 | 2.50 | 2.61 | 2.57 | 2.45 | 2.37 |
4. product example
On-the-spot use tracking, discovery similar products at home and abroad exist in the use procedure ftractures, and causes the furnace bottom stirring and corrodes fast shortcoming.According to MgO-CaO-Fe
2O
3Be EAF bottom ramming mass own characteristic and environment for use thereof, through repeatedly experiment deliberation, we have introduced high-purity fused magnesite, increase critical granularity to 10mm, and purpose is to reduce cracking, improves durability.Utilize Andreassen formula y=100 (d/D) again
qCarry out grain composition, the q value gets 0.19～0.45 as the case may be, to reach closestpacking, improves resistance to fouling.According to different requirements, the design of general producer is that magnesium calcium iron sand particle adds the fused magnesite fine powder, magnesium powder introducing amount 0～25%, this often causes sintering thickness too big, rapidly cooling after the tapping, cooling is shunk to ftracture greatly and is oozed steel, and repeated multiple times causes the furnace bottom stirring, stops up tapping hole, the accidents such as furnace shell and hearth electrode temperature height, and magnesium calcium iron sand is too high, because its aquation very easily, so transportation and preserve difficulty, corrosion resistance descends after the moisture absorption, the moisture of the moisture absorption is vaporized in temperature-rise period, with the volumetric expansion that produces 1244 times, makes easily material blow-up cracking.And our high-purity electrosmelted magnesite clinker introducing amount 30～45%, from the particle to the fine powder; We are designed to high-purity electrosmelted magnesite clinker of 10mm critical particle, have reduced the add-on of magnesium calcium iron sand material, reduce the detrimentally affect that oversintering or aquation are brought greatly.The increase of high-purity fused magnesite can also improve the erosion-resisting characteristics of material, increases the thermal shock resistance that critical granularity has then improved material.This all is our original design.Specific product sees the following form:
| Scheme | MgO ％ | CaO ％ | Fe 2O 3 ％ | Al 2O 3 ％ | SiO 2 ％ | IL ％ | Other wood property % | Volume density g/cm 3 | Magnesia | Magnesia particle % | Cold crushing strength (Mpa) | ||
| 1300℃ *3h | 1500℃ *3h | 1600℃ *3h | |||||||||||
| ① | 93.63 | 0.34 | 4.42 | 0.23 | 0.32 | 0.10 | 0.96 | 2.68 | 95 | 75 | 5.1 | 27.0 | 35.4 |
| ② | 86.86 | 8.21 | 2.76 | 0.38 | 0.63 | 0.18 | 0.98 | 2.65 | 50 | 42 | 15.7 | 37.2 | 48.5 |
| ③ | 84.73 | 9.87 | 3.32 | 0.46 | 0.68 | 0.23 | 0.71 | 2.64 | 40 | 35 | 38.0 | 49.0 | 52.0 |
| ④ | 82.60 | 11.51 | 3.89 | 0.53 | 0.79 | 0.29 | 0.39 | 2.61 | 30 | 24 | 40.5 | 50.6 | 60.0 |
| ⑤ | 72.41 | 20.22 | 5.25 | 0.36 | 0.45 | 0.35 | 0.96 | 2.58 | 10 | 10 | 51.8 | 63.5 | 72.0 |
Claims (4)
1. an EAF bottom dry type ramming material is characterized in that: contain magnesium calcium iron sand, high-purity fused magnesite; Wherein: magnesium calcium iron sand comprises MgO30%～83%, CaO55%-8.5%, Fe
2O
31%-8%, Al
2O
3≤ 1.3%, SiO
2≤ 1.5%, igloss≤1.0%, impurity≤3.2%, bulk density 〉=2.5g/cm
3The critical granularity of high-purity fused magnesite is 10mm, particle introducing amount 0-75%.
2. EAF bottom dry type ramming material according to claim 1, it is characterized in that: magnesium calcium iron sand comprises MgO63%, CaO27.6%, Fe
2O
35%, Al
2O
30.9%, SiO
20.8%, igloss 0.5%, impurity 2.2%, bulk density 〉=2.5g/cm
3The critical granularity of high-purity fused magnesite is 10mm, particle introducing amount 45%.
3. one kind prepares preparation method as claimed in claim 1 and realizes by following steps:
The preparation of magnesium calcium iron sand comprises: raw material is selected and the rotary kiln reheating; Wherein, raw material selects to comprise MgO30%～83%, CaO55%-2.5%, Fe
2O
31%-8%, Al
2O
3≤ 1.3%, SiO
2≤ 1.5%, igloss≤1.0%, impurity≤3.2%, bulk density 〉=2.5g/cm
3Rotary kiln reheating temperature is between 1700-1750 ℃;
Electric furnace furnace bottom dry type ramming material utilizes Andreassen formula y=100 (d/D)
qCarry out grain composition, the q value gets 0.19～0.45.
4. preparation method according to claim 3: wherein, raw material is selected to comprise MgO63%, CaO27.6%, Fe
2O
35%, Al
2O
30.9%, SiO
20.8%, igloss 0.5%, impurity 2.2%, bulk density 〉=2.5g/cm
3Rotary kiln reheating temperature is at 1730 ℃;
Electric furnace furnace bottom dry type ramming material utilizes Andreassen formula y=100 (d/D)
qCarry out grain composition, the q value gets 0.30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100180759A CN1300043C (en) | 2004-04-29 | 2004-04-29 | Electric furnace bottom dry ramming mass and its making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100180759A CN1300043C (en) | 2004-04-29 | 2004-04-29 | Electric furnace bottom dry ramming mass and its making method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1690012A CN1690012A (en) | 2005-11-02 |
| CN1300043C true CN1300043C (en) | 2007-02-14 |
Family
ID=35345817
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|---|---|---|---|
| CNB2004100180759A Expired - Fee Related CN1300043C (en) | 2004-04-29 | 2004-04-29 | Electric furnace bottom dry ramming mass and its making method |
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| CN (1) | CN1300043C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555155B (en) * | 2009-05-27 | 2012-01-04 | 攀枝花学院 | Dry type ramming material for continuous casting tundish |
| LU91868B1 (en) | 2011-09-09 | 2013-03-11 | Wurth Paul Sa | Tamping mass for the refractory lining of a metallurgical receptacle, and metallurgical receptacle, in particular blast furnace, comprising a coating using said mass to be tamped. |
| CN102445080B (en) * | 2011-09-19 | 2015-02-11 | 李成武 | Submerged arc furnace body and constructing method thereof |
| CN102718508A (en) * | 2012-02-23 | 2012-10-10 | 沈恩有 | Application of magnesite composite material preparation method in nickel-iron high carbon ferrochrome production by submerged arc furnace |
| CN104692819A (en) * | 2015-02-13 | 2015-06-10 | 海城市金福锋科技有限公司 | Preparation method of composite phase combined magnesium-base unshaped refractory material applied to bottom of electric furnace |
| CN105732053B (en) * | 2016-01-15 | 2018-12-04 | 山西禄纬堡太钢耐火材料有限公司 | A kind of raw material proportioning and production method of magnesia-calcium brick hearth bottom circular seam ramming mass |
| CN108484129A (en) * | 2018-03-12 | 2018-09-04 | 海城市中兴镁质合成材料有限公司 | A kind of magnesium calcium iron sand and preparation method thereof using ultra-high-temperature tunnel kiln sintering synthesis |
| CN111995374A (en) * | 2019-05-27 | 2020-11-27 | 海城市祥程矿业有限公司 | Magnesium ramming mass for electric furnace |
| CN115259865A (en) * | 2021-04-29 | 2022-11-01 | 宝山钢铁股份有限公司 | Conductive refractory material for electric furnace bottom hot repair |
| CN114315320B (en) * | 2021-12-29 | 2023-03-24 | 耐镁佳(营口)金属有限公司 | Magnesium oxide refractory material and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096777A (en) * | 1993-06-22 | 1994-12-28 | 本溪钢铁公司钢铁研究所 | Calcareous ramming mass |
| CN1341573A (en) * | 2000-09-06 | 2002-03-27 | 冶金工业部洛阳耐火材料研究院 | Baking-free rumming mass for iron tap channel of blast furnace and its preparation method |
-
2004
- 2004-04-29 CN CNB2004100180759A patent/CN1300043C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096777A (en) * | 1993-06-22 | 1994-12-28 | 本溪钢铁公司钢铁研究所 | Calcareous ramming mass |
| CN1341573A (en) * | 2000-09-06 | 2002-03-27 | 冶金工业部洛阳耐火材料研究院 | Baking-free rumming mass for iron tap channel of blast furnace and its preparation method |
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| Publication number | Publication date |
|---|---|
| CN1690012A (en) | 2005-11-02 |
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Address after: 200072, No. 1183, Lane 155, Shanghai Road, Shanghai Patentee after: Shanghai Pengpu Special Refractory Material Factory Co., Ltd. Address before: 200072, No. 1183, Lane 155, Shanghai Road, Shanghai Patentee before: Pengpu Special Refractory Factory, Shanghai |
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Granted publication date: 20070214 Termination date: 20130429 |