CN104692819A - Preparation method of composite phase combined magnesium-base unshaped refractory material applied to bottom of electric furnace - Google Patents
Preparation method of composite phase combined magnesium-base unshaped refractory material applied to bottom of electric furnace Download PDFInfo
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- CN104692819A CN104692819A CN201510076884.3A CN201510076884A CN104692819A CN 104692819 A CN104692819 A CN 104692819A CN 201510076884 A CN201510076884 A CN 201510076884A CN 104692819 A CN104692819 A CN 104692819A
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- Prior art keywords
- ground dolomite
- powder
- ferrite powder
- parts
- ball
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000011819 refractory material Substances 0.000 title abstract description 5
- 239000002131 composite material Substances 0.000 title abstract 2
- 239000000843 powder Substances 0.000 claims abstract description 95
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 28
- 239000010459 dolomite Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000011812 mixed powder Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 56
- 230000015572 biosynthetic process Effects 0.000 claims description 40
- 238000003786 synthesis reaction Methods 0.000 claims description 40
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 12
- 229910052749 magnesium Inorganic materials 0.000 claims description 12
- 239000011777 magnesium Substances 0.000 claims description 12
- 239000003595 mist Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000009700 powder processing Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 11
- 239000000428 dust Substances 0.000 abstract 4
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to a preparation method of a composite phase combined magnesium-base unshaped refractory material applied to the bottom of an electric furnace. The material is prepared from the following raw materials in parts by weight: 95-99 parts of a synthetic ball prepared from dolomite dust and iron oxide powder and 1-5 parts of desilicated zirconia, wherein the percentage of the dolomite dust MgO+CaO is larger than or equal to 80%; the percentage of the iron oxide powder Fe2O3 is larger than 98%; the percentage of the desilicated zirconia ZrO2 is larger than 98.5%; the preparation method comprises the following concrete steps: (1) preparing a dolomite dust-iron oxide powder synthetic ball by using the dolomite dust and the iron oxide powder; (2) processing the dolomite dust-iron oxide powder synthetic ball into fine powder with different particle sizes and mixing in proportion; (3) uniformly mixing and stirring the dolomite dust-iron oxide powder synthetic ball mixed powder and desilicated zirconia micro-powder of which the size is 325 meshes, and packaging a finished product in a bag. The preparation method disclosed by the invention has the advantages of improving the stability of material volume and preventing the problems of cracking, peeling and blocking of a steel discharging opening at the furnace body. By adding a special modifying agent desilicated zirconia and adopting a dolomite dust and iron oxide powder compounding technology, crystal type transformation, generated during material cooling, of the raw materials, is inhibited; surface pulverization of the furnace bottom is solved when the furnace is shut down; the service life of the material is further obviously prolonged.
Description
Technical field
The present invention relates to refractory materials, particularly a kind of EAF bottom complex phase is in conjunction with magnesium base unshape refractory preparation method.
Background technology
Along with the raising that user requires steel product quality, particularly in recent years steel mill to the raising of the comprehensive economic indexs such as steel/ton cost, constantly employ new technology, former EAF bottom magnesium calcium irony refractory materials can not adapt to the needs of current metallurgical technology well, furnace bottom produces cracking, causes and peel off, the problem even blocking tap hole happens occasionally, and shows even more serious when oxygen blast strengthening smelting, becomes restriction electrometallurgy production bottleneck.This phenomenon has lasted for several years and has not solved.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of EAF bottom complex phase in conjunction with magnesium base unshape refractory, and anti-scour property is excellent, effectively prevent furnace bottom from ftractureing, the problem in the performances such as prolongs life is low.
For achieving the above object, the present invention realizes by the following technical solutions:
EAF bottom complex phase in conjunction with magnesium base unshape refractory preparation method, raw material by weight ratio, synthesis ball 95-99 part that ground dolomite and ferrite powder are made, additional desilicated zirconia 1-5 part; Described ground dolomite MgO+CaO>=80%, ferrite powder Fe
2o
3> 98%, desilicated zirconia ZrO
2> 98.5%; Concrete steps are as follows:
1) ground dolomite and ferrite powder processing are worn into granularity 325 order fine powder, by weight ratio, ground dolomite 105-115 part, ferrite powder 2-4 part, mixes above-mentioned granularity material, pressure ball, drying, to fire, and makes ground dolomite-ferrite powder synthesis ball;
2) ground dolomite-ferrite powder synthesis ball processing is worn into the fine powder of granularity 6-3mm, 3-1mm, 1-0 ㎜, and extract ground dolomite-ferrite powder synthesis ball portion 1-0 ㎜ fine powder out and wear into 200 order fine powders, extract ground dolomite-ferrite powder synthesis ball portion 200 order fine powder out and wear into 325 order micro mists; By ground dolomite-ferrite powder synthesis ball powder mixing, size composition is with parts by weight: 6-3mm 25-35 part, 3-1mm 20-30 part, 1-0 ㎜ 15-25 part, 200 order 5-15 parts, 325 order 5-15 parts;
3) granularity 325 object micro mist is worn in desilicated zirconia processing, add ground dolomite-ferrite powder synthesis ball mixed powder, ground dolomite-ferrite powder synthesis ball powder 95-99 part, desilicated zirconia 325 order micro mist 1-5 part mixing and stirring, finished product packs.
Described complex phase in conjunction with magnesium base unshape refractory finished product physical and chemical index is:
Chemical constitution/%
Compressive strength/Mpa
1200℃,3h 20～30
1600℃,3h 30～40
Linear change rate/%
1200℃,3h +1.0～+1.5
1600℃,3h +0.9～+1.4
Compared with prior art, the invention has the beneficial effects as follows:
(1) volume change of the present invention under medium and high temperature state shows as microdilatancy, and former magnesium calcium irony refractory materials is then significantly shrink.And then reach the contraction of offsetting original material, improve material volume stability, avoid furnace bottom to produce cracking, cause and peel off, even block the problem of tap hole.
(2) the present invention is by adding special modified dose of desilicated zirconia, adopts ground dolomite and ferrite powder compounding technology, inhibits the transformation of crystal of raw material when material cool, and when solving blowing out, the surperficial efflorescence of furnace bottom, guarantees that material lifetime significantly improves further.
Embodiment
Below in conjunction with embodiment, the present invention is further described:
Following examples describe the present invention.These embodiments are only be described optimum implementation of the present invention, do not limit scope of the present invention.
Embodiment 1:
EAF bottom complex phase in conjunction with magnesium base unshape refractory preparation method, raw material by weight ratio, 95 parts, the synthesis ball that ground dolomite and ferrite powder are made, additional desilicated zirconia 5 parts; Described ground dolomite MgO+CaO>=80%, ferrite powder Fe
2o
3> 98%, desilicated zirconia ZrO
2> 98.5%; Concrete steps are as follows:
1) ground dolomite and ferrite powder processing are worn into granularity 325 order fine powder, by weight ratio, ground dolomite 105 parts, ferrite powder 2 parts, mixes above-mentioned granularity material, pressure ball, drying, to fire, and makes ground dolomite-ferrite powder synthesis ball;
2) ground dolomite-ferrite powder synthesis ball processing is worn into the fine powder of granularity 6-3mm, 3-1mm, 1-0 ㎜, and extract ground dolomite-ferrite powder synthesis ball portion 1-0 ㎜ fine powder out and wear into 200 order fine powders, extract ground dolomite-ferrite powder synthesis ball portion 200 order fine powder out and wear into 325 order micro mists; By ground dolomite-ferrite powder synthesis ball powder mixing, size composition is with parts by weight: 6-3mm 25 parts, 3-1mm 25 parts, 1-0 ㎜ 25 parts, 200 15 parts, orders, 325 5 parts, orders;
3) granularity 325 object micro mist is worn in desilicated zirconia processing, add ground dolomite-ferrite powder synthesis ball mixed powder, ground dolomite-ferrite powder synthesis ball powder 95 parts, desilicated zirconia 325 order micro mist 5 parts of mixing and stirring, finished product packs.
Embodiment 2
EAF bottom complex phase in conjunction with magnesium base unshape refractory preparation method, raw material by weight ratio, 97 parts, the synthesis ball that ground dolomite and ferrite powder are made, additional desilicated zirconia 3 parts; Described ground dolomite MgO+CaO>=80%, ferrite powder Fe
2o
3> 98%, desilicated zirconia ZrO
2> 98.5%; Concrete steps are as follows:
1) ground dolomite and ferrite powder processing are worn into granularity 325 order fine powder, by weight ratio, ground dolomite 110 parts, ferrite powder 3 parts, mixes above-mentioned granularity material, pressure ball, drying, to fire, and makes ground dolomite-ferrite powder synthesis ball;
2) ground dolomite-ferrite powder synthesis ball processing is worn into the fine powder of granularity 6-3mm, 3-1mm, 1-0 ㎜, and extract ground dolomite-ferrite powder synthesis ball portion 1-0 ㎜ fine powder out and wear into 200 order fine powders, extract ground dolomite-ferrite powder synthesis ball portion 200 order fine powder out and wear into 325 order micro mists; By ground dolomite-ferrite powder synthesis ball powder mixing, size composition is with parts by weight: 6-3mm 30 parts, 3-1mm 22 parts, 1-0 ㎜ 11 parts, 200 19 parts, orders, 325 15 parts, orders;
3) granularity 325 object micro mist is worn in desilicated zirconia processing, add ground dolomite-ferrite powder synthesis ball mixed powder, ground dolomite-ferrite powder synthesis ball powder 97 parts, desilicated zirconia 325 order micro mist 3 parts of mixing and stirring, finished product packs.
Embodiment 3
EAF bottom complex phase in conjunction with magnesium base unshape refractory preparation method, raw material by weight ratio, 99 parts, the synthesis ball that ground dolomite and ferrite powder are made, additional desilicated zirconia 1 part; Described ground dolomite MgO+CaO>=80%, ferrite powder Fe
2o
3> 98%, desilicated zirconia ZrO
2> 98.5%; Concrete steps are as follows:
1) ground dolomite and ferrite powder processing are worn into granularity 325 order fine powder, by weight ratio, ground dolomite 115 parts, ferrite powder 4 parts, mixes above-mentioned granularity material, pressure ball, drying, to fire, and makes ground dolomite-ferrite powder synthesis ball;
2) ground dolomite-ferrite powder synthesis ball processing is worn into the fine powder of granularity 6-3mm, 3-1mm, 1-0 ㎜, and extract ground dolomite-ferrite powder synthesis ball portion 1-0 ㎜ fine powder out and wear into 200 order fine powders, extract ground dolomite-ferrite powder synthesis ball portion 200 order fine powder out and wear into 325 order micro mists; By ground dolomite-ferrite powder synthesis ball powder mixing, size composition is with parts by weight: 6-3mm 35 parts, 3-1mm 20 parts, 1-0 ㎜ 25 parts, 200 10 parts, orders, 325 9 parts, orders;
3) granularity 325 object micro mist is worn in desilicated zirconia processing, add ground dolomite-ferrite powder synthesis ball mixed powder, ground dolomite-ferrite powder synthesis ball powder 99 parts, desilicated zirconia 325 order micro mist 1 part of mixing and stirring, finished product packs.
Embodiment 1-3 complex phase in conjunction with magnesium base unshape refractory finished product physical and chemical index is:
Chemical constitution/%
Compressive strength/Mpa
1200℃,3h 20～30
1600℃,3h 30～40
Linear change rate/%
1200℃,3h +1.0～+1.5
1600℃,3h +0.9～+1.4 。
Claims (2)
1. EAF bottom complex phase is in conjunction with magnesium base unshape refractory preparation method, it is characterized in that, raw material by weight ratio, synthesis ball 95-99 part that ground dolomite and ferrite powder are made, additional desilicated zirconia 1-5 part; Described ground dolomite MgO+CaO>=80%, ferrite powder Fe
2o
3> 98%, desilicated zirconia ZrO
2> 98.5%; Concrete steps are as follows:
1) ground dolomite and ferrite powder processing are worn into granularity 325 order fine powder, by weight ratio, ground dolomite 105-115 part, ferrite powder 2-4 part, mixes above-mentioned granularity material, pressure ball, drying, to fire, and makes ground dolomite-ferrite powder synthesis ball;
2) ground dolomite-ferrite powder synthesis ball processing is worn into the fine powder of granularity 6-3mm, 3-1mm, 1-0 ㎜, and extract ground dolomite-ferrite powder synthesis ball portion 1-0 ㎜ fine powder out and wear into 200 order fine powders, extract ground dolomite-ferrite powder synthesis ball portion 200 order fine powder out and wear into 325 order micro mists; By ground dolomite-ferrite powder synthesis ball powder mixing, size composition is with parts by weight: 6-3mm 25-35 part, 3-1mm 20-30 part, 1-0 ㎜ 15-25 part, 200 order 5-15 parts, 325 order 5-15 parts;
3) granularity 325 object micro mist is worn in desilicated zirconia processing, add ground dolomite-ferrite powder synthesis ball mixed powder, ground dolomite-ferrite powder synthesis ball powder 95-99 part, desilicated zirconia 325 order micro mist 1-5 part mixing and stirring, finished product packs.
2. EAF bottom complex phase according to claim 1 is in conjunction with magnesium base unshape refractory preparation method, and described obtained complex phase in conjunction with magnesium base unshape refractory finished product physical and chemical index is:
Chemical constitution/%
Compressive strength/Mpa
1200℃,3h 20～30
1600℃,3h 30～40
Linear change rate/%
1200℃,3h +1.0～+1.5
1600℃,3h +0.9～+1.4 。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510076884.3A CN104692819A (en) | 2015-02-13 | 2015-02-13 | Preparation method of composite phase combined magnesium-base unshaped refractory material applied to bottom of electric furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510076884.3A CN104692819A (en) | 2015-02-13 | 2015-02-13 | Preparation method of composite phase combined magnesium-base unshaped refractory material applied to bottom of electric furnace |
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| CN104692819A true CN104692819A (en) | 2015-06-10 |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105622069A (en) * | 2015-12-31 | 2016-06-01 | 海城市中兴高档镁质砖有限公司 | Zirconium compounding magnesium-calcium-iron ramming material and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1174180A (en) * | 1996-08-21 | 1998-02-25 | 冶金部洛阳耐火材料研究院 | Hydration resisting magnesium-calcium clinker and its production process |
| CN1690012A (en) * | 2004-04-29 | 2005-11-02 | 上海彭浦特种耐火材料厂 | Electric furnace bottom dry ramming mass and its making method |
| CN1962553A (en) * | 2006-11-24 | 2007-05-16 | 辽宁中兴矿业集团有限公司 | MgO-CaO-Fe2O3 synthetic material for electric cooker bottom |
-
2015
- 2015-02-13 CN CN201510076884.3A patent/CN104692819A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1174180A (en) * | 1996-08-21 | 1998-02-25 | 冶金部洛阳耐火材料研究院 | Hydration resisting magnesium-calcium clinker and its production process |
| CN1690012A (en) * | 2004-04-29 | 2005-11-02 | 上海彭浦特种耐火材料厂 | Electric furnace bottom dry ramming mass and its making method |
| CN1962553A (en) * | 2006-11-24 | 2007-05-16 | 辽宁中兴矿业集团有限公司 | MgO-CaO-Fe2O3 synthetic material for electric cooker bottom |
Non-Patent Citations (1)
| Title |
|---|
| 游杰刚: ""钢铁冶金用耐火材料"", 《钢铁冶金用耐火材料》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105622069A (en) * | 2015-12-31 | 2016-06-01 | 海城市中兴高档镁质砖有限公司 | Zirconium compounding magnesium-calcium-iron ramming material and preparation method thereof |
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Application publication date: 20150610 |
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