CN114292095A - Preparation method of low-carbon corundum spinel impact brick suitable for smelting various steels - Google Patents
Preparation method of low-carbon corundum spinel impact brick suitable for smelting various steels Download PDFInfo
- Publication number
- CN114292095A CN114292095A CN202210029062.XA CN202210029062A CN114292095A CN 114292095 A CN114292095 A CN 114292095A CN 202210029062 A CN202210029062 A CN 202210029062A CN 114292095 A CN114292095 A CN 114292095A
- Authority
- CN
- China
- Prior art keywords
- corundum
- spinel
- low
- carbon
- fused
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention provides a preparation method of a low-carbon corundum spinel impact brick suitable for smelting various steel. The preparation method of the low-carbon corundum spinel impact brick suitable for smelting various steels comprises the following steps: s1, raw materials: (1) main raw materials: brown corundum, fused white corundum, fused magnesia and a bonding agent; (2) auxiliary raw materials: corundum powder, fused spinel powder and activated alumina (Al)2O3) (ii) a S2, a manufacturing process: (1) uniformly mixing the brown corundum, the fused white corundum and the fused magnesia which are prepared in the step S1 to obtain mixed aggregate; (2) the binder prepared in S1 is added to the above (1) and kneaded for 3 to 5 min. The invention is suitable for various steelsThe preparation method of the smelted low-carbon corundum spinel impact brick has the advantages of less carbon, saving resources, reducing the temperature of a low-steel ladle shell and strengthening the heat insulation effect.
Description
Technical Field
The invention belongs to the technical field of corundum spinel impact bricks, and particularly relates to a preparation method of a low-carbon corundum spinel impact brick suitable for smelting various steel.
Background
The impact brick is a high-quality refractory material, because the carbon-containing refractory product has the advantages of high refractoriness, good slag erosion resistance, strong thermal shock resistance, small high-temperature creep deformation and the like, the carbon-containing refractory product is widely applied to a steelmaking electric furnace, a converter and a refining furnace, and the service life of a furnace lining is greatly prolonged, so the carbon-containing refractory product is rapidly popularized and applied in many countries all over the world, and the carbon-containing product has good slag infiltration resistance and corrosion resistance, so the prior refining ladle mostly adopts unfired impact bricks and impact bricks with different grades, however, the carbon-containing product has the problems of carbon increase to molten steel, fast temperature drop of molten steel in the ladle, high temperature of a ladle shell and the like caused by heat conductivity, the lining high-quality material which has no pollution to steel, high strength and long service life is urgently needed, therefore, the carbon-free ladle material is favored by high-quality smelting enterprises, and in related technologies, the preparation of the normal-temperature solidified magnesium-carbon alloy steel brick is disclosed, belongs to the technical field of refractory materials. The preparation process comprises the following steps: mixing magnesia, carbon, phenolic resin bonding agent and light-burned dolomite powder to obtain mixed pug; if an inclined counter-current mixer is used for mixing, a pre-mixing process can be omitted, and the required materials are directly put into the mixer for mixing to obtain the mixed pug. Putting the obtained mixed pug into a press die for pressure forming to obtain a formed magnesia carbon brick; and (3) storing the formed magnesia carbon brick at room temperature for 2-4 days to obtain the magnesia carbon brick. Due to the fact that the baking process is reduced, the energy required by baking of the magnesia carbon brick can be saved by 80-120 kg/ton according to standard coal. The obtained magnesia carbon brick has high calcium oxide content, certain high temperature creep property and better spalling resistance compared with the common magnesia carbon brick, and can prolong the service life and purify molten steel if being used as a furnace lining material for smelting stainless steel.
However, the structure has the defects that the impact brick prepared by the method has more carbon, wastes resources, has higher temperature of the low steel ladle shell and has poorer heat insulation and preservation effects.
Therefore, there is a need to provide a new method for preparing low-carbon corundum spinel impact brick suitable for smelting various steels to solve the above technical problems
Disclosure of Invention
The invention solves the technical problem of providing the preparation method of the low-carbon corundum spinel impact brick which is convenient to use, can simply and effectively cut the textile fabric, avoids pulling silk threads on the textile fabric during cutting, is simple and convenient to operate and is suitable for smelting various steel.
In order to solve the technical problems, the preparation method of the low-carbon corundum spinel impact brick suitable for smelting various steels provided by the invention comprises the following steps:
s1, raw materials:
(1) main raw materials: brown corundum, fused white corundum, fused magnesia and a bonding agent;
(2) auxiliary raw materials: corundum powder, fused spinel powder and activated alumina (Al)2O3)；
S2, a manufacturing process:
(1) uniformly mixing the brown corundum, the fused white corundum and the fused magnesia which are prepared in the step S1 to obtain mixed aggregate;
(2) adding the bonding agent prepared in the step S1 into the step (1), and mixing for 3-5 min;
(3) uniformly mixing the corundum powder, the fused spinel powder and the active alumina prepared in the step S1 to obtain active composite spinel micro powder, adding the obtained active composite spinel micro powder into the step (2), continuously mixing for 16-18min, and discharging;
(4) placing the article discharged in the step (3) into a friction pressure forming machine for forming treatment so as to obtain the low-carbon corundum spinel impact brick;
(5) placing the low-carbon corundum spinel impact brick obtained in the step (4) in a shade place, and naturally drying for 24 hours;
(6) placing the naturally dried low-carbon corundum spinel impact brick in the step (5) into a drying box for drying at the temperature of 200 ℃ for 12 hours;
(7) placing the dried low-carbon corundum spinel impact brick in the step (6) into a drying box for continuous drying, wherein the drying temperature is 1000 ℃, and the drying time is 3 hours;
(8) and (3) placing the dried low-carbon corundum spinel impact brick in the step (7) into a drying box to be dried continuously, wherein the drying temperature is 1600 ℃, and the drying time is 3 hours, so that the finished low-carbon corundum spinel impact brick is obtained.
As a further scheme of the invention, the bonding agent is SiO2(silicon dioxide) micropowder and brine.
As a further scheme of the invention, the granularity of the brown corundum is less than or equal to 5mm, the proportion of the brown corundum is 50%, the granularity of the fused white corundum is less than or equal to 3mm, the granularity of the corundum powder is less than or equal to 0.044mm, and the proportion of the fused white corundum and the corundum powder is 25%.
As a further scheme of the invention, the granularity of the fused magnesia is less than or equal to 2mm, the percentage of the fused magnesia is 4%, the active composite spinel micro powder is 20%, and the percentage of the bonding agent is 1%.
Compared with the prior art, the preparation method of the low-carbon corundum spinel impact brick suitable for smelting various steels has the following beneficial effects:
the invention provides a preparation method of a low-carbon corundum spinel impact brick suitable for smelting various steels, which comprises the following steps:
1. the addition of a certain amount of coarse-grain magnesite is beneficial to avoiding a large amount of spinel from being generated quickly and reducing reaction expansion, thereby being beneficial to avoiding the cracking and peeling of the unfired ladle brick in high-temperature use;
2. after the mass fraction is more than 4%, the linear expansion is obviously increased after the firing, for the low-carbon corundum spinel impact brick, the line shrinkage is too large after the firing, so that the brick joints are too large, the steel drilling phenomenon can be generated, and the expansion is too large after the firing, so that the stress is larger, and the structure is easy to peel off;
3. when the mass fraction of the composite micro powder is 15% and 20%, the low-carbon corundum spinel impact brick has good thermal shock resistance, because continuous spinel phases generated in the matrix are filled among particles at high temperature, and when the addition amount of the composite micro powder is proper, a proper amount of spinel phases are generated to generate a proper amount of microcracks, so that the thermal stress can be effectively buffered, and the thermal shock resistance of the material is improved.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the magnesite of the present invention after firing;
FIG. 2 is a schematic diagram of the physical properties of the present invention.
Detailed Description
Referring to fig. 1 and fig. 2, fig. 1 is a schematic view of the magnesite of the present invention after burning;
FIG. 2 is a schematic diagram of the physical properties of the present invention. The preparation method of the low-carbon corundum spinel impact brick suitable for smelting various steels comprises the following steps:
s1, raw materials:
(1) main raw materials: brown corundum, fused white corundum, fused magnesia and a bonding agent;
(2) auxiliary raw materials: corundum powder, fused spinel powder and activated alumina (Al)2O3)；
S2, a manufacturing process:
(1) uniformly mixing the brown corundum, the fused white corundum and the fused magnesia which are prepared in the step S1 to obtain mixed aggregate;
(2) adding the bonding agent prepared in the step S1 into the step (1), and mixing for 3-5 min;
(3) uniformly mixing the corundum powder, the fused spinel powder and the active alumina prepared in the step S1 to obtain active composite spinel micro powder, adding the obtained active composite spinel micro powder into the step (2), continuously mixing for 16-18min, and discharging;
(4) placing the article discharged in the step (3) into a friction pressure forming machine for forming treatment so as to obtain the low-carbon corundum spinel impact brick;
(5) placing the low-carbon corundum spinel impact brick obtained in the step (4) in a shade place, and naturally drying for 24 hours;
(6) placing the naturally dried low-carbon corundum spinel impact brick in the step (5) into a drying box for drying at the temperature of 200 ℃ for 12 hours;
(7) placing the dried low-carbon corundum spinel impact brick in the step (6) into a drying box for continuous drying, wherein the drying temperature is 1000 ℃, and the drying time is 3 hours;
(8) and (3) placing the dried low-carbon corundum spinel impact brick in the step (7) into a drying box to be dried continuously, wherein the drying temperature is 1600 ℃, and the drying time is 3 hours, so that the finished low-carbon corundum spinel impact brick is obtained.
The bonding agent is SiO2(silicon dioxide) micropowder and brine.
The grain size of the brown corundum is less than or equal to 5mm, the proportion of the brown corundum is 50%, the grain size of the fused white corundum is less than or equal to 3mm, the grain size of the corundum powder is less than or equal to 0.044mm, and the proportion of the fused white corundum and the corundum powder is 25%.
The granularity of the fused magnesia is less than or equal to 2mm, the percentage is 4%, the active composite spinel micro powder percentage is 20%, and the percentage of the bonding agent is 1%.
Because the finer the magnesia particle size is, the more Al2O3The reaction speed for forming the spinel is faster, otherwise, the reaction speed is slower, and meanwhile, the critical granularity of the magnesite is increased, the penetration depth of slag in the material is increased, and the corrosion loss is gradually reduced, so that a certain amount of coarse-grain magnesite is added to avoid a large amount of spinel from being rapidly generated, the reaction expansion is reduced, and the cracking and the peeling of the unburned ladle brick in high-temperature use are avoided, so that the magnesite is in a mode of matching particles and fine powder in order to avoid violent expansion and later-stage over-sintering of the low-carbon corundum spinel impact brick in the use process;
as shown in fig. 1, under the condition that the addition amount of the active composite spinel micro powder is not changed, the linear change rate of the low-carbon corundum spinel impact brick added with different amounts of fused magnesia after being burnt at 1600 ℃ for 3 hours can be seen from fig. 1, when the mass fraction of the added magnesia is 3%, slight expansion is generated in the low-carbon corundum spinel impact brick, after the mass fraction is more than 4%, the linear expansion after being burnt is obviously increased, for the low-carbon corundum spinel impact brick, the linear shrinkage after being burnt is too large, the brick joints are too large, the steel drilling phenomenon can be generated, and after being burnt, the expansion is too large, the stress is larger, the structure is easy to be peeled off, therefore, the mass fraction of the added magnesia is 4%;
when the mass fraction of the composite micro powder is less than or equal to 20 percent, the thermal shock resistance of the sample can be improved, but when the mass fraction of the composite micro powder is 25 percent, the thermal shock resistance of the sample is obviously deteriorated, and when the mass fraction of the composite micro powder is 15 percent and 20 percent, the thermal shock resistance of the low-carbon corundum spinel impact brick is better because continuous spinel phases generated in a matrix at high temperature are filled among particles, and when the addition amount of the composite micro powder is proper, a proper amount of spinel phases are generated to generate a proper amount of microcracks, which can effectively buffer thermal stress, thereby improving the thermal shock resistance of the material, but when the addition amount of the composite micro powder is excessive, in-situ spinel generated at high temperature is too much accompanied by larger volume expansion to cause loose matrix structure, so that the bonding strength of the matrix is reduced to cause the reduction of the thermal shock resistance of the material, therefore, the mass fraction of the low-carbon corundum spinel impact brick micro powder is suitably added to be 20 percent;
as can be seen from FIG. 2, the low carbon corundum spinel impact brick exhibits slight expansion after being treated at 1000 ℃ and has high strength, which indicates that magnesia begins to react with Al at 1000 ℃2O3The reaction generates spinel, the bonding strength of the matrix is increased, the resistance to thermal peeling caused by thermal stress is facilitated, the apparent porosity of the low-carbon corundum spinel impact brick is reduced after the treatment at 1600 ℃, and a compact and uniform structure is formed in the brick, so that the slag resistance permeability of the brick is facilitated to be improved, and the structural peeling is reduced.
Compared with the prior art, the preparation method of the low-carbon corundum spinel impact brick suitable for smelting various steels has the following beneficial effects:
the invention provides a preparation method of a low-carbon corundum spinel impact brick suitable for smelting various steel, which is beneficial to avoiding the cracking and peeling of unfired ladle bricks in high-temperature use by adding a certain amount of coarse-grain magnesite to avoid a large amount of spinel from being generated quickly and reducing reaction expansion;
after the mass fraction is more than 4 percent, the linear expansion is obviously increased after the firing, for the low-carbon corundum spinel impact brick, the brick joints are too large and the steel drilling phenomenon can be generated due to too large linear shrinkage after the firing, and the stress is larger due to too large expansion after the firing, so that the structure is easy to peel off;
when the mass fraction of the composite micro powder is 15% and 20%, the low-carbon corundum spinel impact brick has good thermal shock resistance, because continuous spinel phases generated in the matrix are filled among particles at high temperature, and when the addition amount of the composite micro powder is proper, a proper amount of spinel phases are generated to generate a proper amount of microcracks, so that the thermal stress can be effectively buffered, and the thermal shock resistance of the material is improved.
Claims (4)
1. A preparation method of a low-carbon corundum spinel impact brick suitable for smelting various steels is characterized by comprising the following steps:
s1, raw materials:
(1) main raw materials: brown corundum, fused white corundum, fused magnesia and a bonding agent;
(2) auxiliary raw materials: corundum powder, fused spinel powder and activated alumina (Al)2O3) Active composite spinel micro powder;
s2, a manufacturing process:
(1) uniformly mixing the brown corundum, the fused white corundum and the fused magnesia which are prepared in the step S1 to obtain mixed aggregate;
(2) adding the bonding agent prepared in the step S1 into the step (1), and mixing for 3-5 min;
(3) uniformly mixing the corundum powder, the fused spinel powder and the active alumina prepared in the step S1 to obtain active composite spinel micro powder, adding the obtained active composite spinel micro powder into the step (2), continuously mixing for 16-18min, and discharging;
(4) placing the article discharged in the step (3) into a friction pressure forming machine for forming treatment so as to obtain the low-carbon corundum spinel impact brick;
(5) placing the low-carbon corundum spinel impact brick obtained in the step (4) in a shade place, and naturally drying for 24 hours;
(6) placing the naturally dried low-carbon corundum spinel impact brick in the step (5) into a drying box for drying at the temperature of 200 ℃ for 12 hours;
(7) placing the dried low-carbon corundum spinel impact brick in the step (6) into a drying box for continuous drying, wherein the drying temperature is 1000 ℃, and the drying time is 3 hours;
(8) and (3) placing the dried low-carbon corundum spinel impact brick in the step (7) into a drying box to be dried continuously, wherein the drying temperature is 1600 ℃, and the drying time is 3 hours, so that the finished low-carbon corundum spinel impact brick is obtained.
2. The method for preparing the low-carbon corundum spinel impact brick suitable for various steel smelting in claim 1, wherein the bonding agent is SiO2(silicon dioxide) micropowder and brine.
3. The method for preparing a low-carbon corundum spinel impact brick suitable for various steel smelting in claim 1, wherein the grain size of the brown corundum is less than or equal to 5mm, the proportion of the brown corundum is 50%, the grain size of the fused white corundum is less than or equal to 3mm, the grain size of the corundum powder is less than or equal to 0.044mm, and the proportion of the fused white corundum to the corundum powder is 25%.
4. The method for preparing the low-carbon corundum spinel impact brick suitable for various steel smelting according to claim 1, wherein the granularity of the fused magnesia is less than or equal to 2mm, the proportion is 4%, the proportion of the active composite spinel micro powder is 20%, and the proportion of the bonding agent is 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210029062.XA CN114292095A (en) | 2022-01-11 | 2022-01-11 | Preparation method of low-carbon corundum spinel impact brick suitable for smelting various steels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210029062.XA CN114292095A (en) | 2022-01-11 | 2022-01-11 | Preparation method of low-carbon corundum spinel impact brick suitable for smelting various steels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114292095A true CN114292095A (en) | 2022-04-08 |
Family
ID=80978416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210029062.XA Pending CN114292095A (en) | 2022-01-11 | 2022-01-11 | Preparation method of low-carbon corundum spinel impact brick suitable for smelting various steels |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114292095A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116041080A (en) * | 2023-02-10 | 2023-05-02 | 西峡县西保冶金材料有限公司 | Scour-resistant low-carbon long-service-life stopper rod and preparation method thereof |
| CN116063085A (en) * | 2022-12-19 | 2023-05-05 | 苏州大学 | In-situ spinel Dan Gangbao brick for high-cleanness steel smelting and preparation method thereof |
| CN116177998A (en) * | 2023-03-03 | 2023-05-30 | 河南竹林庆州耐火材料有限公司 | Regenerated low-carbon corundum spinel impact plate and preparation method thereof |
| CN116199517A (en) * | 2023-03-03 | 2023-06-02 | 河南竹林庆州耐火材料有限公司 | Low-carbon corundum spinel impact brick for tundish and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103420683A (en) * | 2012-05-18 | 2013-12-04 | 德清县钢友耐火材料有限公司 | Tundish low-carbon corundum spinel impact brick and preparation method thereof |
| CN112645731A (en) * | 2021-01-08 | 2021-04-13 | 武汉科技大学 | Lightweight spinel-corundum-carbon refractory material and preparation method thereof |
-
2022
- 2022-01-11 CN CN202210029062.XA patent/CN114292095A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103420683A (en) * | 2012-05-18 | 2013-12-04 | 德清县钢友耐火材料有限公司 | Tundish low-carbon corundum spinel impact brick and preparation method thereof |
| CN112645731A (en) * | 2021-01-08 | 2021-04-13 | 武汉科技大学 | Lightweight spinel-corundum-carbon refractory material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 万红伶: "无碳刚玉-尖晶石不烧钢包砖的研制与应用", 《耐火材料》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116063085A (en) * | 2022-12-19 | 2023-05-05 | 苏州大学 | In-situ spinel Dan Gangbao brick for high-cleanness steel smelting and preparation method thereof |
| CN116041080A (en) * | 2023-02-10 | 2023-05-02 | 西峡县西保冶金材料有限公司 | Scour-resistant low-carbon long-service-life stopper rod and preparation method thereof |
| CN116177998A (en) * | 2023-03-03 | 2023-05-30 | 河南竹林庆州耐火材料有限公司 | Regenerated low-carbon corundum spinel impact plate and preparation method thereof |
| CN116199517A (en) * | 2023-03-03 | 2023-06-02 | 河南竹林庆州耐火材料有限公司 | Low-carbon corundum spinel impact brick for tundish and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114292095A (en) | Preparation method of low-carbon corundum spinel impact brick suitable for smelting various steels | |
| CN108484138A (en) | A kind of sliding plate brick and preparation method thereof adding composite alumina micro mist and carbon source | |
| CN107352977A (en) | A kind of slag line brick for ladle and preparation method | |
| CN102584293B (en) | Method for preparing magnesium-zirconium-carbon slide gate nozzle | |
| CN102838360B (en) | Composite fireproof material and preparation method thereof | |
| CN101391897A (en) | Air brick for magnesia carbon ladle and method for producing the same | |
| CN110563476A (en) | Fiber-reinforced refractory brick and preparation method thereof | |
| CN112358302B (en) | Self-repairing anhydrous stemming | |
| CN110668801A (en) | High thermal shock sintered Al2O3-ZrO2-C sliding plate brick and preparation method thereof | |
| CN102838361A (en) | MgCa-SiC-C fireproof material and preparation method thereof | |
| CN114031377A (en) | Cement-free combined gunning mix for carbon-free steel ladle and preparation method thereof | |
| CN108585797B (en) | Self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride and preparation method thereof | |
| JP2012036064A (en) | Alumina-carbon unfired brick for lining molten metal holding furnace, method for producing the same, and furnace equipment and construction method using the same | |
| CN112876265A (en) | Titanium-silicon-carbon metal composite converter slag-stopping sliding plate brick and preparation method thereof | |
| CN106904980A (en) | A kind of magnesium aluminum spinel pouring material of blast furnace iron outlet groove slag corrosion resistance | |
| CN112358305A (en) | Electric furnace ladle wall magnesia carbon brick capable of preventing longitudinal cracking and preparation process thereof | |
| CN112759369A (en) | Magnesia-carbon brick with high thermal shock stability | |
| CN107043265B (en) | Unfired magnesia-chrome brick for metallurgy and nonferrous smelting furnace and preparation method thereof | |
| CN117430407A (en) | Preparation process of magnesia carbon brick for tapping hole of converter | |
| CN110615670A (en) | High-performance magnesium sliding brick and preparation method thereof | |
| CN107382345B (en) | Preparation method of micro-nano spinel toughened MgO-MA aggregate | |
| CN113461411B (en) | Oxidation-resistant aluminum silicon carbide carbon brick and preparation method thereof | |
| CN112624743B (en) | Sliding plate brick for blocking slag at converter steel tapping hole formed by casting and production method | |
| CN114478031A (en) | Production process of unburned aluminum-magnesia-carbon brick for electric furnace steel ladle | |
| CN107226702A (en) | A kind of tundish environment-protection dry type vibrating material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220408 |