CN101113099A - High-alumina electric furnace cover pouring material and preparation method thereof - Google Patents
High-alumina electric furnace cover pouring material and preparation method thereof Download PDFInfo
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- CN101113099A CN101113099A CNA2007100526411A CN200710052641A CN101113099A CN 101113099 A CN101113099 A CN 101113099A CN A2007100526411 A CNA2007100526411 A CN A2007100526411A CN 200710052641 A CN200710052641 A CN 200710052641A CN 101113099 A CN101113099 A CN 101113099A
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Abstract
The invention relates to a castable material of high aluminum electric stove and a preparation method thereof. The technic proposal is that: 75-90wt% high aluminum bauxite clinker, 3-15wt% fine poder kyanite, 1-10wt% micro-powder aluminum oxide, 0-10wt% aluminate cement, 1-5wt% alumino silica gel are firstly mixed, and 0.10-0.25wt% water reducer of the mixture and 5.0-6.5% water are added into the mixture, and the mixture is stirred for 5-10min to be casted into a mold, and the mold is naturally conserved for 12-24h and demould, and is dried in 110 DEG C for 24h. The casting mold is either entire-cast or deblocking-cast, and finally the molds are assembled. The invention adopts high aluminum bauxite clinker as base, and the prepared products has the advantages of good thermal shock resistance, high density, which is difficult for splashing substances of high temperature cinder to penetrate, and has excellent erosion resistance as well as long service life.
Description
Technical Field
The present invention belongs to the field of refractory material using bauxite chamotte as base material. In particular to a high-aluminum electric furnace cover casting material and a preparation method thereof.
Background
Electric furnace steelmaking is one of the main steelmaking production processes, and a steelmaking electric arc furnace is the main steelmaking equipment. The electric furnace cover is an important component of a steelmaking electric arc furnace, and as the refractory material of the electric furnace cover is subjected to strong heat radiation, frequent thermal shock and erosion action of high-temperature slag splashes, the electric furnace cover has a short service life, is a weak link of the whole steelmaking electric furnace, and often influences the steelmaking production of the electric furnace due to maintenance and replacement of the furnace cover. With the development of electric furnace steelmaking technology, the steelmaking proportion of a high-power and ultrahigh-power electric arc furnace is increased year by year, the steelmaking rhythm is accelerated, and an electric arc furnace cover is subjected to the erosion damage effects of heat radiation with higher intensity, thermal shock and more high-temperature slag splashes. The service life of common high-alumina refractory materials such as high-alumina bricks of the electric furnace cover is obviously shortened, and the new use requirements can not be met.
For this purpose, the sintered MgO brick and MgO-Gr are used in foreign countries2O3Brick (US4169734, US3864136) technology. In use, MgO bricks and MgO-Gr are fired as the periclaseforms a continuous solid solution with the wustite (FeO)2O3The brick has good resistance to alkaline slag containing iron oxide and calcium oxide, but the magnesium material has large thermal expansion coefficient, high elastic modulus and poor thermal shock stability, and slag permeates into periclase grains during use, thereby causing the structure to be stripped. In contrast, a corundum material has the characteristics of good high-temperature resistance, thermal shock resistance and the like, but a pure corundum material has poor erosion resistance in use and has serious stripping and chipping phenomena in the use process. In China, manufacturers also manufacture high-quality high-alumina bricks (CN 86103155), but the strict use requirements of electric furnace strengthening smelting are difficult to meet.
Disclosure of Invention
The invention aims to provide the electric furnace cover for steelmaking and the preparation method thereof, wherein the electric furnace cover has the advantages of good thermal shock resistance, high density, long service life, good erosion resistance and difficult penetration of high-temperature slag splashes.
In order to realize the task, the technical scheme adopted by the invention is as follows: firstly, 75-90 wt% of bauxite chamotte, 3-15 wt% of kyanite fine powder, 1-10 wt% of alumina micro powder, 0-10 wt% of aluminate cement and 1-5 wt% of silica-alumina gel are mixed, 0.10-0.25 wt% of water reducing agent and 5.0-6.5 wt% of water are added into the mixture, the mixture is stirred for 5-10 min, the mixture is cast and molded, the mixture is naturally cured for 12-24 h and is demoulded, and then the mixture is dried at 110 ℃ for 24 h. The casting molding is carried out either integrally or after the block casting molding, and then the assembly is carried out.
Wherein: al of bauxite chamotte2O3Al of fine Lanjingshi powder with content of more than or equal to 85.0 wt% and grain size of 0-25 mm2O3The content is more than or equal to 55.0 wt%, the grain diameter is 0.15-0.074 mm, and Al of the alumina micropowder2O3The content is more than or equal to 98.0 wt%, the grain diameter is 0-0.045 mm, and Al of aluminate cement2O3The content is more than or equal to 60.0 wt%, and the particle size is 0-0.15 mm; the water reducing agent is sodium tripolyphosphate,One or more of sodium hexametaphosphate, sodium lignosulfonate, calcium lignosulfonate, naphthalene water reducing agent and sodium polyacrylate.
By adopting the technical scheme, the high-alumina bauxite clinker is used as the base material, and the prepared high-alumina electric furnace cover casting material and precast block have the characteristics of good use effect, good thermal shock resistance, high density, difficult penetration of high-temperature slag splashes, good erosion resistance and long service life.
Detailed Description
The invention is further described with reference to the following examples:
example 1
A high-alumina electric furnace cover casting material and a preparation method thereof. Firstly, 75-80 wt% of bauxite chamotte, 5-10 wt% of kyanite fine powder, 3-8 wt% of alumina micro powder, 1-5 wt% of aluminate cement and 2-4 wt% of silica-alumina gel are mixed, 0.18-0.20 wt% of sodium tripolyphosphate and 5.0-6.0 wt% of water are added into the mixture, the mixture is stirred for 5-6 min, and the mixture is formed by block casting. And (4) naturally curing for 12-24 h, demolding, drying at 110 ℃ for 24h, and thenassembling.
Wherein: high alumina bauxiteAl of the material2O3Al of fine Lanjingshi powder with content of more than or equal to 85.0 wt% and grain size of 0-25 mm2O3The content is more than or equal to 55.0 wt%, the grain diameter is 0.15-0.074 mm, and Al of the alumina micropowder2O3The content is more than or equal to 98.0 wt%, the grain diameter is 0-0.045 mm, and Al of aluminate cement2O3The content is more than or equal to 60.0 wt%, and the grain diameter is 0-0.15 mm.
Example 2
A high-alumina electric furnace cover casting material and a preparation method thereof. Firstly, 80-90 wt% of bauxite chamotte, 3-10 wt% of kyanite fine powder, 2-7 wt% of alumina micro powder and 3-5 wt% of silicon-aluminum gel are mixed, 0.18-0.20 wt% of sodium tripolyphosphate, sodium hexametaphosphate and 5.0-6.0 wt% of water are added into the mixture, the mixture is stirred for 5-6 min, and the mixture is integrally cast and molded. And (4) naturally curing for 12-24 h, demolding, and drying at 110 ℃ for 24 h.
Wherein: al of bauxite chamotte2O3Al of fine Lanjingshi powder with content of more than or equal to 85.0 wt% and grain size of 0-25 mm2O3The content is more than or equal to 55.0 wt%, the grain diameter is 0.15-0.074 mm, and Al of the alumina micropowder2O3The content is more than or equal to 98.0 wt%, and the particle size is 0-0.045 mm.
Example 3
A high-alumina electric furnace cover casting material and a preparation method thereof. Firstly, 80-85 wt% of bauxite chamotte, 3-8 wt% of kyanite fine powder, 3-8 wt% of alumina micro powder, 1-5 wt% of aluminate cement and 1-3 wt% of silica-alumina gel are mixed, 0.18-0.20 wt% of sodium hexametaphosphate and 5.0-6.0 wt% of water are added into the mixture, the mixture is stirred for 5-6 min, and the mixture is formed by block casting. And (4) naturally curing for 12-24 h, demolding, drying at 110 ℃ for 24h, and then assembling.
Wherein: al of bauxite chamotte2O3Al of fine Lanjingshi powder with content of more than or equal to 85.0 wt% and grain size of 0-25 mm2O3The content is more than or equal to 55.0 wt%, the grain diameter is 0.15-0.074 mm, and Al of the alumina micropowder2O3The content is more than or equal to 98.0 wt%, the grain diameter is 0-0.045 mm, and Al of aluminate cement2O3The content is more than or equal to 60.0 wt%, and the grain diameter is 0-0.15 mm.
The product prepared by the embodiment has the following measurement physicochemical indexes: the apparent porosity is 11.2-12.8% at 110 ℃ for 24h and 12.5-13.2% at 1500 ℃ for 3 h; the volume density is 110 ℃ multiplied by 24h 3.0-3.08 g/cm3，1500℃×3h 3.03～3.12g/cm3(ii) a The compressive strength is 56.5-60.3 MPa at 110 ℃ for 24h and 92.5-105.6 MPa at 1500 ℃ for 3 h; the normal temperature breaking strength is 110 ℃ multiplied by 24h 6.0-8.5 MPa, 1500 ℃ multiplied by 5h 18.0-22.1 MPa; the static crucible method is basically free of penetration and erosion when the slag resistance is 1500 ℃ multiplied by 3 h; the linear change rate is 1500 ℃ multiplied by 5h, and the linear change rate is-0.07-0.10% after burning; warp beam And (keeping the temperature for 20 minutes, and cooling with water for 5 minutes) until the end part is broken, wherein the thermal shock frequency is 55-60.
The high-alumina bauxite clinker is used asa base material, and the prepared high-alumina electric furnace cover casting material and the prepared precast block have the characteristics of good use effect, good thermal shock resistance, high density, difficult penetration of high-temperature slag splashes, good erosion resistance and long service life.
Claims (5)
1. The high-alumina electric furnace cover casting material is characterized by firstly mixing 75-90 wt% of high-alumina bauxite chamotte, 3-15 wt% of kyanite fine powder, 1-10 wt% of alumina micro powder, 0-10 wt% of aluminate cement and 1-5 wt% of silicon-aluminum gel, adding 0.10-0.25 wt% of water reducing agent and 5.0-6.5 wt% of water into the mixture, stirring for 5-10 min, casting and molding, naturally curing for 12-24 h, demolding, and drying at 110 ℃ for 24 h.
2. The high alumina electric furnace cover casting material and the preparation method thereof according to claim 1, characterized in that the bauxite chamotte Al2O3The content is more than or equal to 85.0 wt%, and the particle size is 0-25 mm; fine powder of Lanjinite Al2O3The content is more than or equal to 55.0 wt%, and the particle size is 0.15-0.074 mm; al of alumina micropowder2O3The content is more than or equal to 98.0wt percent, and the granulesThe diameter is 0-0.045 mm; al of aluminate cement2O3The content is more than or equal to 60.0 wt%, and the grain diameter is 0-0.15 mm.
3. The high-alumina electric furnace cover casting material and the preparation method thereof as claimed in claim 1, characterized in that the water reducing agent is one or a mixture of more than one of sodium tripolyphosphate, sodium hexametaphosphate, sodium lignosulfonate, calcium lignosulfonate, naphthalene water reducing agent and sodium polyacrylate.
4. The high-aluminum electric furnace cover casting material and the preparation method thereof according to claim 1, characterized in that the casting molding is either integral casting molding or block casting molding and then assembling.
5. The high-alumina electric furnace cover casting material and the preparation method thereof according to any one of claims 1 to 4.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101602610B (en) * | 2009-04-17 | 2012-02-01 | 陈红良 | Raw material formulation for furnace cover of cement-less entire electric furnace |
| CN102765954A (en) * | 2012-08-10 | 2012-11-07 | 萍乡市科兴窑炉材料有限公司 | Water system press-in grouting material used for iron making hot blast heater system and preparation method thereof |
| CN105622122A (en) * | 2016-02-02 | 2016-06-01 | 江苏瑞复达新材料有限公司 | Ultramicro kyanite refractory castable and application thereof |
| CN106187227A (en) * | 2016-07-08 | 2016-12-07 | 温州嘉利特实业有限公司 | The packing material of a kind of moulding by casting high-temperature flame-proof stove and moulding process thereof |
| CN106316429A (en) * | 2016-08-22 | 2017-01-11 | 河南鑫诚耐火材料股份有限公司 | Carbon roaster flue wall guy brick precast block and production method thereof |
| CN108046784A (en) * | 2018-01-30 | 2018-05-18 | 黎文泰 | A kind of high alumina refractory casting material and preparation method thereof |
-
2007
- 2007-07-05 CN CNB2007100526411A patent/CN100478306C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101602610B (en) * | 2009-04-17 | 2012-02-01 | 陈红良 | Raw material formulation for furnace cover of cement-less entire electric furnace |
| CN102765954A (en) * | 2012-08-10 | 2012-11-07 | 萍乡市科兴窑炉材料有限公司 | Water system press-in grouting material used for iron making hot blast heater system and preparation method thereof |
| CN102765954B (en) * | 2012-08-10 | 2014-09-17 | 萍乡市科兴窑炉材料有限公司 | Water system press-in grouting material used for iron making hot blast heater system and preparation method thereof |
| CN105622122A (en) * | 2016-02-02 | 2016-06-01 | 江苏瑞复达新材料有限公司 | Ultramicro kyanite refractory castable and application thereof |
| CN105622122B (en) * | 2016-02-02 | 2019-01-25 | 江苏瑞复达新材料有限公司 | A kind of ultra micro kyanite refractory casting and its application |
| CN106187227A (en) * | 2016-07-08 | 2016-12-07 | 温州嘉利特实业有限公司 | The packing material of a kind of moulding by casting high-temperature flame-proof stove and moulding process thereof |
| CN106187227B (en) * | 2016-07-08 | 2018-09-21 | 温州嘉利特实业有限公司 | A kind of packing material and its moulding process of moulding by casting high-temperature flame-proof stove |
| CN106316429A (en) * | 2016-08-22 | 2017-01-11 | 河南鑫诚耐火材料股份有限公司 | Carbon roaster flue wall guy brick precast block and production method thereof |
| CN108046784A (en) * | 2018-01-30 | 2018-05-18 | 黎文泰 | A kind of high alumina refractory casting material and preparation method thereof |
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| CN100478306C (en) | 2009-04-15 |
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