CN1124725A - Process for producing unfired Al-Mg-Cr bricks - Google Patents
Process for producing unfired Al-Mg-Cr bricks Download PDFInfo
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- CN1124725A CN1124725A CN 94118856 CN94118856A CN1124725A CN 1124725 A CN1124725 A CN 1124725A CN 94118856 CN94118856 CN 94118856 CN 94118856 A CN94118856 A CN 94118856A CN 1124725 A CN1124725 A CN 1124725A
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Abstract
The method for production of burning-free Al-Mg-Cr brick used as liner of steel ladle uses special-grade alumina grog, Al-Cr material, magnesia alumina spinel, sintered magnesia sand, industrial chromium oxide and water glass (as binder) as raw materials and includes such steps as crushing, fine grinding, pugging, shaping, and then thermal treating. Obtained brick has excellent antioxidation, impervious, anticorrosion and antierosion nature to molten steel and slags.
Description
What the present invention relates to is a kind of production method of unfired Al-Mg-Cr bricks goods, particularly is applicable to steel-making steel teeming ladle Al
2O
3-MgO-Cr
2O
3The production method of matter refractory product.
In the green brick that known steel teeming ladle is used, Unburnt Al2O3MgO Bricks with do not burn Al2O3MgOC Bricks and use extensively; And result of use is better.But it is not good work-ing life that these two kinds of green bricks are used in the openhearth steelmaking steel teeming ladle; It is also undesirable to be used on some Electric furnace steel making steel teeming ladle or the converter steel teeming ladle effect.This is owing to each steel mill's smelting equipment, technology, condition and the different result of institute's steelmaking kind.The washing away of the slag that its basic reason molten steel that to be Unburnt Al2O3MgO Bricks with not burning anti-siemens martin steel molten steel of Al2O3MgOC Bricks or oxygen high and oxidisability are stronger etc., erosion and perviousness are relatively poor.
The invention reside in and overcome above-mentioned Unburnt Al2O3MgO Bricks or do not burn the anti-siemens martin steel molten steel of Al2O3MgOC Bricks, or the stronger slag of the high molten steel of oxygen and oxidisability washes away, erosion and the relatively poor shortcoming of perviousness, attempt to seek the anti-siemens martin steel molten steel of a kind of energy, or the stronger slag of the high molten steel of oxygen and oxidisability wash away, corrode and permeate do not burn refractory product.
The magnalium chrome brick production method of not burning of the present invention is: raw materials usedly be: high grade bauxite grog, Al
2O
3Content is greater than 85%, Fe
2O
3Content is less than 1.8%, and aluminium chromium material is thermit reduction reduction Cr
2O
3Produce the slag of chromium metal, or by high-alumina and fine chrome mine are founded or sintering makes aluminium chromium material; Cr wherein
2O
3Content is greater than 8%, Al
2O
3Content is big by 75%.Synthetic MgAl spinal material Al
2O
3Content is greater than 50%, and MgO content is greater than 25%.Magnesite clinker, MgO content is greater than 92%.The industrial oxidation chromium ultrafine powder, Cr
2O
3Content is greater than 96%.
In the brickmaking pug: coarse particles is made of the high grade bauxite grog.In the middle particle, the ratio of high grade bauxite grog and aluminium chromium material is (1.0 to 99.0): (1.0 to 99.0).In the mixing fine powders, the aluminium chromium material fine powder accounts for 20 to 45%, and the industrial oxidation chromium ultrafine powder accounts for 2 to 15%, and magnesia powder accounts for 10 to 30%, and synthetic MgAl spinal material fine powder accounts for 5 to 75%, and high grade bauxite grog fine powder is 1.0 to 50%.The grain composition of pug is:
Thick material (6-1mm) 40-50%
Middle particle (1-0.088mm) 10-20%
Mixing fine powders (＜0.088mm) 35-45%
Pug mixes at mixing pan, adds 5-8% water glass (modulus 2.4 to 2.6) when mixing, and after fully mixing, at 80MPa to 200M4Pa forming under the pressure, the adobe of forming was toasted 8-24 hours under 200-350 ℃ of conditions after seasoning.
The invention has the advantages that that is produced does not burn the anti-open hearth molten steel of magnalium chromium goods, the washing away of high molten steel of oxygen and oxidisability is strong, ferric oxide is high steel-making slag, erosion and good penetrability.Its reason is: contain free Cr in (1) goods matrix
2O
3Ultrafine powder, Cr
2O
3The ultrafine powder reactivity worth easily forms high melting compound or forms high viscosity melt with many oxide compounds, thereby stoped melt to permeate in brick, has alleviated the structure spalling of green brick; (2) be added with magnesium-aluminium spinel in the matrix, help using the Tipping Center spathous to continue to form and grow up.Spinel easily absorbs ferric oxide, thereby improves the erosion of the slag of high molten steel of green brick antioxygen and oxidation susceptibility; (3) Al in the matrix
2O
3, Cr
2O
3The reaction that forms the magnalium picotite with MgO is one the reaction of volumetric expansion effect to be arranged, so this kind green brick in use slightly expands, thereby brickwork joint is reduced, alleviate or avoided brickwork joint be easy to corrode and damage, prolonged the whole steel teeming ladle life-span; (4) Cr
2O
3Ultrafine powder, MgO powder etc. easily form various sosoloid with alumina particle etc., help this green brick to form stronger combination in high temperature uses, to resist washing away of melt.
Unfired Al-Mg-Cr bricks of the present invention need not burn till through high temperature kiln, so cost is lower.
Embodiment:
Raw materials used chemistry branch: high grade bauxite grog, Al
2O
388.70%, Fe
2O
31.43%, (Na
2O+K
2O) 0.44%.Aluminium chromium material, Al
2O
382.13%, Cr
2O
39.76%, MgO 4.59%.The magnesite clinker fine powder, MgO 96.58%, and CaO 1.47%, Fe
2O
30.21%.Synthetic MgAl spinal fine powder Al
2O
355.83%, MgO34.42%.The industrial oxidation chromium ultrafine powder, Cr
2O
398.57%.
With the high grade bauxite grog broken pulverize, fine grinding is prepared into coarse particles (5-1mm), middle particle (1-0.088mm) with fine powder (＜0.074mm) three kinds of material, aluminium chromium material is broken to be pulverized, fine grinding become in particle (1-0.088mm) with fine powder (＜0.074mm) two kinds of material.
With high grade bauxite grog fine powder, aluminium chromium material powder, magnesia powder, magnesium-aluminium spinel fine powder and industrial oxidation chromium ultrafine powder in proportion: 30: 30: 25: preparation in 7.5: 7.5, make mixing fine powders through abundant pre-mixing.
By high grade bauxite grog coarse particles 40%, particle 8% in particle 12% aluminium chromium material in the high grade bauxite grog, mixing fine powders 40% batching, adding 6% glass (modulus 2.4) is wedding agent, fully mixes at mixing pan, makes the brickmaking pug.The moulding on 630 tons of brick pressing machines of brickmaking pug was toasted 24 hours down at 250 ℃ then, promptly got and did not burn magnalium chromium goods.Its physical and chemical index is as follows: Al
2O
376.72%, Cr
2O
34.88%, MgO 10.71% volume density 2.98g/cm
3, void content 16% cold crushing strength 84MPa
Claims (2)
1, a kind of steel teeming ladle green brick production method is characterized in that:
In the batching: high grade bauxite grog 40-70% (weight)
Aluminium chromium material 10-35% (weight)
Synthetic MgAl spinal material 2-30% (weight)
Magnesite clinker 2-15% (weight)
Industrial oxidation chromium (ultrafine powder) 1-6% (weight)
Wedding agent: water glass (adding) 5-8% (weight) mixes, and mechanical pressing is then through 200 ℃ of-350 ℃ of baking processing.
2, method according to claim 1 is characterized in that: in raw materials used
The high grade bauxite grog, Al
2O
3Content is greater than 85%, Fe
2O
3Content is less than 1.8%;
Aluminium chromium material is thermit reduction reduction Cr
2O
3Produce the slag of Metal Cr, or by high-alumina and fine chrome mine are founded or sintering is produced aluminium chromium material; Cr wherein
2O
3Content is greater than 8%, Al
2O
3Content is greater than 75%;
The synthetic MgAl spinal material, Al
2O
3Content is greater than 50%, and MgO content is greater than 25%;
Magnesite clinker, MgO content is greater than 92%;
The industrial oxidation chromium ultrafine powder, Cr
2O
3Content is greater than 96%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94118856 CN1124725A (en) | 1994-12-12 | 1994-12-12 | Process for producing unfired Al-Mg-Cr bricks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94118856 CN1124725A (en) | 1994-12-12 | 1994-12-12 | Process for producing unfired Al-Mg-Cr bricks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1124725A true CN1124725A (en) | 1996-06-19 |
Family
ID=5039058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94118856 Pending CN1124725A (en) | 1994-12-12 | 1994-12-12 | Process for producing unfired Al-Mg-Cr bricks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1124725A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065899C (en) * | 1997-07-09 | 2001-05-16 | 冶金工业部鞍山焦化耐火材料设计研究院 | New and compound burning-free nozzle brick for coke oven and its manufacturing method |
| CN101475391B (en) * | 2009-01-15 | 2011-09-07 | 武汉科技大学 | Chromium-free alkaline brick for cement kiln and preparation thereof |
| CN104086186A (en) * | 2014-06-10 | 2014-10-08 | 长兴北辰耐火阻燃材料有限公司 | Unfired magnesite magnesia-chrome brick |
| CN104591751A (en) * | 2014-12-10 | 2015-05-06 | 洛阳利尔耐火材料有限公司 | Preparation method and building method for marked gasification furnace lower cinder notch |
| CN105669213A (en) * | 2014-11-19 | 2016-06-15 | 无锡市德林环保工程有限公司 | Fire brick for cement kiln |
-
1994
- 1994-12-12 CN CN 94118856 patent/CN1124725A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065899C (en) * | 1997-07-09 | 2001-05-16 | 冶金工业部鞍山焦化耐火材料设计研究院 | New and compound burning-free nozzle brick for coke oven and its manufacturing method |
| CN101475391B (en) * | 2009-01-15 | 2011-09-07 | 武汉科技大学 | Chromium-free alkaline brick for cement kiln and preparation thereof |
| CN104086186A (en) * | 2014-06-10 | 2014-10-08 | 长兴北辰耐火阻燃材料有限公司 | Unfired magnesite magnesia-chrome brick |
| CN105669213A (en) * | 2014-11-19 | 2016-06-15 | 无锡市德林环保工程有限公司 | Fire brick for cement kiln |
| CN104591751A (en) * | 2014-12-10 | 2015-05-06 | 洛阳利尔耐火材料有限公司 | Preparation method and building method for marked gasification furnace lower cinder notch |
| CN104591751B (en) * | 2014-12-10 | 2017-05-24 | 洛阳利尔耐火材料有限公司 | Preparation method and building method for marked gasification furnace lower cinder notch |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |