CN102140034A - Magnesium-chromium brick for vacuum chamber of RH furnace and preparation method thereof - Google Patents
Magnesium-chromium brick for vacuum chamber of RH furnace and preparation method thereof Download PDFInfo
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- CN102140034A CN102140034A CN2011100787545A CN201110078754A CN102140034A CN 102140034 A CN102140034 A CN 102140034A CN 2011100787545 A CN2011100787545 A CN 2011100787545A CN 201110078754 A CN201110078754 A CN 201110078754A CN 102140034 A CN102140034 A CN 102140034A
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Abstract
The invention relates to a magnesium-chromium brick for the lower part of a vacuum chamber of an RH furnace and the easily damaged position of a dip pipe and a preparation method thereof. The magnesium-chromium brick comprises the following components in percentage by weight: 55%-70% of magnesite or chromium ores with the granularity of 0.1-5 millimeters or mixtures of the magnesite ores and the chromium ores in any proportion, 30%-45% of magnesite or chromium ores with the granularity of less than 0.1 millimeter or mixtures of the magnesite ores and the chromium ores in any proportion, and inorganic sol binding agents with the concentration of 5-60%, wherein the inorganic sol binding agents account for 2%-5% of the total percentage by weight of two granular raw materials. The preparation method comprises the following steps of: once or twice adding the inorganic sol binding agents with the concentration of 5-60%; carrying out compression moulding; baking; naturally cooling to room temperature; taking out the baked magnesium-chromium brick, and detecting. The invention enables the magnesium-chromium brick to have excellent compactness, slag penetration resistance and thermal spalling resistance by adopting the inorganic sol binding agents, thereby enhancing the using period of the lower part of the vacuum chamber of the RH furnace and the easily damaged position of the dip pipe; and in addition, the invention is beneficial to energy saving and consumption and cost reduction.
Description
Technical field
The present invention relates to smelt, specifically belong to magnesia chrome brick and preparation method, belong to the easily damaged position of RH stove vacuum chamber bottom and soaking tub magnesia chrome brick and preparation method thereof definitely with refractory brick and preparation method.
Background technology
The RH stove is to produce one of indispensable visual plant of high quality steel in the external refining process.From present service condition, the key link in restriction RH stove life-span is vacuum chamber bottom and tubular stinger position, and this and the damage of used magnesia chrome brick too seriously have direct relation.Owing in the production of magnesia chrome brick, generally adopt organic bond at present, organic bond can produce decomposition, volatilization when the high temperature burnt brick, thereby can cause loose, the tissue deterioration of material structure, and then influence material compactness, slag penetration resistance, heat resistanceheat resistant spalling etc., can supervene obnoxious flavour, contaminate environment simultaneously.Though both at home and abroad the worker raw materials used and preparation technology aspect has carried out big quantity research to magnesia chrome brick, aspect the wedding agent that is adopted, does not see the report that has inorganic sol to make wedding agent.
Summary of the invention
Present invention is directed at the problems referred to above of present existence, provide a kind of RH stove vacuum chamber with compactness, slag penetration resistance and the heat resistanceheat resistant spalling is good, life cycle is long magnesia chrome brick and preparation method.
The technical measures that address the above problem:
A kind of RH stove vacuum chamber magnesia chrome brick, its component and weight percent are: the mixture of magnesia that granularity is 0.1～5 millimeter or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore is 55～70%, and the magnesia of granularity＜0.1 millimeter or the mixture of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore are 30～45%; The inorganic sol wedding agent of weight concentration 5～60% is 2～5% of above-mentioned two kinds of granularity raw material total amounts;
Described inorganic sol wedding agent refers to: the mixture of one or both in zirconia sol, titanium oxide sol, magnesium oxide colloidal sol and the alumina sol and above arbitrary proportion.
It is characterized in that: described magnesia is electrosmelted magnesite clinker or magnesite clinker; Described chrome ore is fused magnesia-chrome, sintering magnesia-chrome sand, chromite or fine chrome mine.
Prepare the method for a kind of RH stove vacuum chamber, its step with magnesia chrome brick:
1) carries out batch mixing: the magnesia of the mixture 55～70% of the magnesia of 0.1～5 millimeter of granularity or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore and granularity＜0.1 millimeter or the mixture 30～45% of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore are mixed;
2) the adding weight concentration is 5～60% inorganic sol wedding agent 2～5%, and stirs;
3) compression moulding;
4) fire, control its firing temperature, and under this temperature condition, be incubated 6～12 hours at 1750～1850 ℃;
5) naturally cool to room temperature;
6) take out the magnesia chrome brick fire and testing.
Prepare the method for a kind of RH stove vacuum chamber, its step with magnesia chrome brick:
1) adding weight concentration in the mixture 55～70% of the magnesia of 0.1～5 millimeter of granularity or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore is 5～60% inorganic sol wedding agent, add-on accounts for 50～80% of this inorganic sol wedding agent total amount, and stirs;
2) add the magnesia of granularity＜0.1 millimeter or the mixture 30～45% of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore, and mix;
3) above-mentioned remaining 20～50% inorganic sol wedding agent is added, and stir;
4) compression moulding;
5) fire, control its firing temperature, and under this temperature condition, be incubated 6～12 hours at 1750～1850 ℃;
6) naturally cool to room temperature;
7) take out the magnesia chrome brick fire and testing.
It is characterized in that: weight concentration is that the add-on of 5～60% inorganic sol wedding agent becomes with the concentration of this inorganic sol wedding agent oppositely to add.
The present invention compared with prior art, owing to adopt the wedding agent of inorganic sol wedding agent as the preparation magnesia chrome brick, make compactness, slag penetration resistance and the heat resistanceheat resistant spalling of magnesia chrome brick good, so can improve the vacuum chamber bottom and the easily damaged position of the soaking tub life cycle of RH refining furnace, especially make the tubular stinger life-span be increased to 140 stoves from 120 stoves, ensured the ordinary production of RH refining furnace, also helped iron and steel enterprise simultaneously and save energy and reduce the cost, reduce cost.
Embodiment
Component and preparation method according to magnesia chrome brick are listed in the table below embodiment:
The component of magnesia chrome brick and weight percent are: the mixture of magnesia that granularity is 0.1～5 millimeter or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore is 55～70%, and the magnesia of granularity＜0.1 millimeter or the mixture of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore are 30～45%; The inorganic sol wedding agent of weight concentration 5～60% is 2～5% of above-mentioned two kinds of granularity raw material total weight percent;
Described inorganic sol wedding agent refers to: the mixture of one or both in zirconia sol, titanium oxide sol, magnesium oxide colloidal sol and the alumina sol and above arbitrary proportion.
Described magnesia is electrosmelted magnesite clinker or magnesite clinker; Described chrome ore is fused magnesia-chrome, sintering magnesia-chrome sand, chromite or fine chrome mine.
Prepare the two kind methods of a kind of RH stove vacuum chamber with magnesia chrome brick:
Method one, its step:
1) carries out batch mixing: the magnesia of the mixture 55～70% of the magnesia of 0.1～5 millimeter of granularity or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore and granularity＜0.1 millimeter or the mixture 30～45% of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore are mixed;
2) the adding weight concentration is 5～60% inorganic sol wedding agent 2～5%, and stirs;
3) compression moulding;
4) fire, control its firing temperature, and under this temperature condition, be incubated 6～12 hours at 1750～1850 ℃;
5) naturally cool to room temperature;
6) take out the magnesia chrome brick fire and testing.
Method two, its step:
1) adding weight concentration in the mixture 55～70% of the magnesia of 0.1～5 millimeter of granularity or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore is 5～60% inorganic sol wedding agent, and add-on accounts for 50～80% of this inorganic sol wedding agent total amount, and stirs evenly;
2) add the magnesia of granularity＜0.1 millimeter or the mixture 30～45% of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore, and mixing;
3) above-mentioned remaining 20～50% inorganic sol wedding agent is added, and stir;
4) compression moulding;
5) fire, control its firing temperature, and under this temperature condition, be incubated 6～12 hours at 1750～1850 ℃;
6) naturally cool to room temperature;
7) take out the magnesia chrome brick fire and testing.
Weight concentration is that the add-on of 5～60% inorganic sol wedding agent becomes with the concentration of this inorganic sol wedding agent oppositely to add.
Table one is the component and the tabulation of weight percent value of the present invention and Comparative Examples.
Table two is the processing parameter value tabulation of the present invention and Comparative Examples.
Table three is the Performance Detection value list of the present invention and Comparative Examples.
The component of table one the present invention and Comparative Examples and the tabulation of weight percent value
Table two is the processing parameter value tabulation of the present invention and Comparative Examples
Table three is the Performance Detection value list of the present invention and Comparative Examples
From above table 1-3 as can be seen, after Comparative Examples adopts organic bond, fire under 1830～1850 ℃ of high temperature although be, and soaking time is 12 hours, performance should be better, but on the contrary, apparent porosity is higher, mean pore size is significantly big, compressive strength is low, and high temperature break resistant intensity is low, and the slag penetration degree of depth is dark, its result is relatively poor, and the present invention is an inorganic bonding agent owing to what adopt, although firing temperature is lower, soaking time is shorter, but performance index all are better than Comparative Examples, and energy consumption is low.
Claims (5)
1. RH stove vacuum chamber magnesia chrome brick, its component and weight percent are: the mixture of magnesia that granularity is 0.1～5 millimeter or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore is 55～70%, and the magnesia of granularity＜0.1 millimeter or the mixture of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore are 30～45%; The inorganic sol wedding agent of weight concentration 5～60% is 2～5% of above-mentioned two kinds of granularity raw material total weight percent;
Described inorganic sol wedding agent refers to: the mixture of one or both in zirconia sol, titanium oxide sol, magnesium oxide colloidal sol and the alumina sol and above arbitrary proportion.
2. a kind of RH stove vacuum chamber magnesia chrome brick as claimed in claim 1, it is characterized in that: described magnesia is electrosmelted magnesite clinker or magnesite clinker; Described chrome ore is fused magnesia-chrome, sintering magnesia-chrome sand, chromite or fine chrome mine.
3. prepare the method for the described a kind of RH stove vacuum chamber of claim 1, its step with magnesia chrome brick:
1) carries out batch mixing: the magnesia of the mixture 55～70% of the magnesia of 0.1～5 millimeter of granularity or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore and granularity＜0.1 millimeter or the mixture 30～45% of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore are mixed;
2) the adding weight concentration is 5～60% inorganic sol wedding agent 2～5%, and stirs;
3) compression moulding;
4) fire, control its firing temperature, and under this temperature condition, be incubated 6～12 hours at 1750～1850 ℃;
5) naturally cool to room temperature;
6) take out the magnesia chrome brick fire and testing.
4. prepare the method for the described a kind of RH stove vacuum chamber of claim 1, its step with magnesia chrome brick:
1) adding weight concentration in the mixture 55～70% of the magnesia of 0.1～5 millimeter of granularity or chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore is 5～60% inorganic sol wedding agent, add-on accounts for 50～80% of this inorganic sol wedding agent total amount, and stirs;
2) add the magnesia of granularity＜0.1 millimeter or the mixture 30～45% of chrome ore or magnesia and two kinds of arbitrary proportions of chrome ore, and mix;
3) above-mentioned remaining 20～50% inorganic sol wedding agent is added, and stir;
4) compression moulding;
5) fire, control its firing temperature, and under this temperature condition, be incubated 6～12 hours at 1750～1850 ℃;
6) naturally cool to room temperature;
7) take out the magnesia chrome brick fire and testing.
5. as claim 3 or a kind of RH stove of the 4 described preparations vacuum chamber method with magnesia chrome brick, it is characterized in that: weight concentration is that the add-on of 5～60% inorganic sol wedding agent becomes reverse adding with the concentration of this inorganic sol wedding agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110078754 CN102140034B (en) | 2011-03-30 | 2011-03-30 | Magnesium-chromium brick for vacuum chamber of RH furnace and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110078754 CN102140034B (en) | 2011-03-30 | 2011-03-30 | Magnesium-chromium brick for vacuum chamber of RH furnace and preparation method thereof |
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| CN102140034A true CN102140034A (en) | 2011-08-03 |
| CN102140034B CN102140034B (en) | 2013-04-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503445A (en) * | 2011-09-20 | 2012-06-20 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method for gas permeable brick with straight through type gas channels |
| CN102659432A (en) * | 2012-05-14 | 2012-09-12 | 攀枝花市银江金勇工贸有限责任公司 | Novel RH gunning refractory |
| CN107903040A (en) * | 2017-11-22 | 2018-04-13 | 海城利尔麦格西塔材料有限公司 | A kind of magnesium chromium matter ramming mass and production method for liquid steel refining stove furnace bottom |
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| CN101708987A (en) * | 2009-11-23 | 2010-05-19 | 海城市中兴高档镁质砖有限公司 | Compound advanced magnesia-chromite brick for RH dip pipes and production method thereof |
| CN101713235A (en) * | 2009-11-03 | 2010-05-26 | 武汉科技大学 | Forsterite light brick and preparation method thereof |
| CN101734908A (en) * | 2009-10-28 | 2010-06-16 | 郑州真金耐火材料有限责任公司 | Method for producing direct-bonded magnesia-chrome brick with high refractorinees under load and high stability of thermal shock resistance |
| CN101774821A (en) * | 2010-02-09 | 2010-07-14 | 中钢集团耐火材料有限公司 | High-strength magnesite-chrome brick and production method thereof |
-
2011
- 2011-03-30 CN CN 201110078754 patent/CN102140034B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734908A (en) * | 2009-10-28 | 2010-06-16 | 郑州真金耐火材料有限责任公司 | Method for producing direct-bonded magnesia-chrome brick with high refractorinees under load and high stability of thermal shock resistance |
| CN101713235A (en) * | 2009-11-03 | 2010-05-26 | 武汉科技大学 | Forsterite light brick and preparation method thereof |
| CN101708987A (en) * | 2009-11-23 | 2010-05-19 | 海城市中兴高档镁质砖有限公司 | Compound advanced magnesia-chromite brick for RH dip pipes and production method thereof |
| CN101774821A (en) * | 2010-02-09 | 2010-07-14 | 中钢集团耐火材料有限公司 | High-strength magnesite-chrome brick and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503445A (en) * | 2011-09-20 | 2012-06-20 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method for gas permeable brick with straight through type gas channels |
| CN102503445B (en) * | 2011-09-20 | 2013-05-22 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method for gas permeable brick with straight through type gas channels |
| CN102659432A (en) * | 2012-05-14 | 2012-09-12 | 攀枝花市银江金勇工贸有限责任公司 | Novel RH gunning refractory |
| CN107903040A (en) * | 2017-11-22 | 2018-04-13 | 海城利尔麦格西塔材料有限公司 | A kind of magnesium chromium matter ramming mass and production method for liquid steel refining stove furnace bottom |
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| CN102140034B (en) | 2013-04-03 |
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