CN101215158A - Method for preparing lightweight magnesium-aluminum spinel raw material - Google Patents
Method for preparing lightweight magnesium-aluminum spinel raw material Download PDFInfo
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- CN101215158A CN101215158A CNA2008100490378A CN200810049037A CN101215158A CN 101215158 A CN101215158 A CN 101215158A CN A2008100490378 A CNA2008100490378 A CN A2008100490378A CN 200810049037 A CN200810049037 A CN 200810049037A CN 101215158 A CN101215158 A CN 101215158A
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Abstract
The invention provides a process for preparing lightweight magnesia-alumina spinel brick raw material, belonging to the production technique of fireproof materials. The process employs Gamma-Al2O3 fine powder and magnesite fine powder as main raw materials, the two are formulated according to the mass ratio of aluminum oxide and magnesium oxide of 2.7-4.0, and organic bond and water are additionally added to uniformly mix. By employing semidry process to mold, green bodies after being baked are calcined at a temperature of 1650-1800DEG C and then heat-insulated for 2-4 hours. The lightweight magnesia-alumina spinel brick raw material provided by the invention can be used for preparing heat-proof fireproof products and heat-proof amorphous fire-proof materials of magnesia-alumina spinel brick. Compared with the heat-proof corundum bricks, the heat-proof bricks prepared by employing lightweight magnesia-alumina spinel brick raw material have lower heat conductivity.
Description
Technical field
The invention belongs to the refractory materials production technology, mainly propose a kind of preparation method of lightweight magnesium-aluminum spinel raw material.
Background technology
Insulating refractory is meant void content height, the refractory materials that volume density is low, thermal conductivity is low.Insulating refractory is widely used in the industrial high temperature furnace equipment, satisfies the requirement of high temperature kiln apparatus and process, reduces the high temperature kiln energy consumption of equipment.Because the type of high temperature kiln equipment is different with requirement, the type of required insulating refractory is also different, as the insulating refractory of unlike material, different use temperatures.The lightweight material that is used for preparing insulating refractory has pearlstone, expanded vermiculite, diatomite, soft clay raw material, the high aluminum raw material of lightweight, light-weight mullite raw material, lightweight corundum-mullite raw material etc. usually; Be used to prepare use temperature and mainly contain fused alumina (corundum) hollow ball and electric-melting zirconia hollow ball etc. at the lightweight material of pyritous insulating refractory more than 1600 ℃.Usually the main lightweight material that adopts a certain type is with the insulating refractory of preparation the type, as adopting fused alumina (corundum) hollow ball feedstock production corundum matter insulating refractory.
With corundum relatively, magnesium-aluminium spinel has fusing point height, premium properties that thermal conductivity is low, can adopt lightweight magnesium-aluminum spinel raw material to prepare magnesium-aluminium spinel matter insulating refractory.
Document (Y.Wen, L.Nan and H.Bingqiang, " High-strength; Lightweight SpinelRefractories. " J.American Ceramic Society Bulletin.April 2005) proportioning of report magnesite and raw bauxite and firing temperature are to the performance impact of synthetic lightweight magnesium-aluminum spinel material, and to have developed apparent porosity be 50%, and compressive strength reaches the magnesium-aluminium spinel light material of 50Mpa.This method is natural matter raw bauxite and magnesite owing to what adopt, raw material impurity content height, and the calcining temperature of synthesis material is also lower, so the use properties of this synthesis material will be restricted.
Japanese Patent (JP9301766) is introduced a kind of method for preparing the porous magnesium-aluminum spinel raw material, adopt metallic aluminium ash or metallic aluminium ash and aluminium hydroxide (with or aluminum oxide), magnesium hydroxide (with or magnesium oxide) be raw material, by batching, moulding with burn till and prepare the synthetic MgAl spinal raw material.Obtain the porosity of holding one's breath 〉=3.0%, apparent porosity 〉=10% of synthesis material, have high thermal resistance, thermal insulation, anti-erosion life.But the void content of this raw material is enough not high, should not prepare the good insulating refractory of effect of heat insulation as main raw material.
Document (Sun Lifeng, Yu Jingkun. the additive light calcined magnesia is to the influence of magnesium-aluminium spinel lightweight refractory sintering character, material and metallurgical journal 2004 (2) 121-123) to have introduced with commercial alumina, heavy burned magnesium oxide be raw material, add light calcined magnesia (the heavy burned magnesium oxide of equivalent substitution), the laboratory study work of slip casting casting one step preparation magnesium-aluminium spinel lightweight refractory.Compressive strength 0.7～the 3.1Mpa of 1600 ℃ of magnesium-aluminium spinel lightweight refractories of firing, volume density 0.8～0.97g/cm
3
Summary of the invention
The objective of the invention is to propose a kind of preparation method of lightweight magnesium-aluminum spinel raw material, this lightweight magnesium-aluminum spinel raw material can be used as the preparation use temperature and uses at the raw material of magnesium-aluminium spinel matter heat insulation refractory product more than 1600 ℃ and heat insulation unshape refractory.
Purpose of the present invention adopts following technical scheme to realize: adopt magnesite fine powder and γ-Al
2O
3(commercial alumina) fine powder is a main raw material, and both proportionings are 2.7～4.0 to carry out by aluminum oxide and magnesium oxide quality ratio, and organic bond and water mix evenly; Adopt semi-dry pressing, the base substrate after the baking 1650～1800 ℃ of calcinings, is incubated 2～4 hours.
The described magnesite fine powder of scheme is the fine powder that magnesite obtains through break process.
MgO mass content 〉=46% of the described magnesite fine powder of scheme.
Described γ-the Al of scheme
2O
3The Al of fine powder
2O
3Mass content 〉=98%.
The described magnesite fine powder of scheme, γ-Al
2O
3The granularity of fine powder is all less than 44 μ m.
The described organic bond of scheme is dextrine powder or pulp powder, and its add-on is 2%～6% of two kinds of main raw material gross weights.
The add-on of the described water of scheme is 10%～15% of two kinds of main raw material gross weights.
The lightweight magnesium-aluminum spinel raw material method characteristics of this sintering process preparation of the present invention are: 1) select for use the magnesite fine powder to make raw material, still keep its former profile, i.e. so-called " illusion " after utilizing the magnesite pyrolysis.Comprise magnesium oxide crystallite and little pore in the illusion, this because female salt illusion and remaining space is difficult to eliminate helps synthetic lightweight material.2) γ-Al
2O
3Selecting suitable aluminum oxide and magnesium oxide quality ratio when fine powder and magnesite fine powder batching is 2.7～4.0, be that the synthetic magnesium-aluminium spinel is that (the theoretical quality ratio of forming of magnesium-aluminium spinel is 2.53 to aluminium riched spinel, the ratio that rich aluminium is formed is greater than 2.53, and the ratio that rich magnesium is formed is less than 2.53).Compare with the material that theory is formed and rich magnesium is formed, the spinel process of rich aluminium composition material is carried out in the temperature province of broad, extends to higher temperature; Its spinel process comprises two steps, and one, aluminum oxide and magnesite decompose the magnesium-aluminium spinel of the magnesium oxide reaction generation that generates; Its two, the free aluminum oxide carries out solid solution reaction with the magnesium-aluminium spinel that generates again, forms aluminium riched spinel.This spinel reaction process is accompanied by the volumetric expansion effect, hinders the sintering of raw material thus, helps preparing the low lightweight material of volume density.Experience high-temperature calcination simultaneously, magnesium-aluminium spinel crystal appropriateness is grown Stability Analysis of Structures.Its aluminum oxide and magnesian quality ratio were less than 2.7 o'clock, and the void content of prepared raw material is lower, volume density is higher relatively; Its ratio has corundum in the prepared raw material and exists mutually greater than 4.0, or its spinel is unstable mutually, can separate out the corundum phase under hot conditions, increases the thermal conductivity of material thus.
This method does not need to add to burn loses agent (or whipping agent), can adopt sintering process to obtain the lightweight material of high porosity, low volume density.The present invention is by adjusting magnesite fine powder and γ-Al
2O
3The ratio of fine powder, and calcining system is controlled the void content of synthetic lightweight material and the size of air vent aperture.Adopt this synthetic lightweight magnesium-aluminum spinel raw material, can be used to prepare use temperature at magnesium-aluminium spinel matter insulating refractory goods or unshape refractory more than 1600 ℃, the use temperature of its use temperature and corundum matter insulating refractory is suitable.With the approaching heat insulation corundum brick of void content, volume density relatively, lower with the thermal conductivity of the insulating brick of lightweight magnesium-aluminum spinel raw material preparation.
Embodiment
Provide embodiments of the invention, but do not constitute any limitation of the invention:
Embodiment 1～3:
Embodiment 1～3 listed by table 1 and the contrast scheme all adopts γ-Al
2O
3Fine powder and magnesite fine powder are raw material, and the granularity of two kinds of raw materials is all less than 44 μ m.Aluminum oxide and the magnesium oxide quality ratio of embodiment 1～3 batching are respectively 2.7,3.0,4.0, contrast the aluminum oxide of scheme and magnesium oxide quality ratio and be 2.4 (prepared magnesium-aluminum spinel raw material consist of magnesium-rich spinel).Add dextrin 3% in the batching.Add water 15% when mixing.Blank forming pressure 80Mpa.Waste base after moulding, the baking is calcined 1730 ℃ of calcining temperatures, soaking time 4 hours in the combustion gas kiln.
The lightweight magnesium-aluminum spinel raw material performance index of embodiment 1～3 are as shown in table 2 below.The performance of the lightweight material of being listed by table 2 shows, with the contrast scheme relatively, aluminum oxide and magnesium oxide quality ratio are respectively the void content higher (41～58%) of 2.7,3.0,4.0 lightweight magnesium-aluminum spinel raw material, volume density is less, grain-size is less.
Proportioning raw materials/the mass% of table 1 embodiment 1～3 and contrast scheme
| Embodiment | The contrast scheme | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| The magnesite fine powder | 47 | 44 | 41 | 34 |
| γ-Al 2O 3Fine powder | 53 | 56 | 59 | 66 |
| Dextrine powder (adding) | 3 | 3 | 3 | 3 |
| Water (adding) | 15 | 15 | 15 | 15 |
| Al 2O 3/ MgO quality ratio | 2.4 | 2.7 | 3.0 | 4.0 |
The performance index of the lightweight material of table 2 embodiment 1～3 and the preparation of contrast scheme
| Embodiment | The contrast scheme | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Void content/% | 23～29 | 41～55 | 42～57 | 45～58 |
| Volume density/g/cm 3 | 2.36～2.61 | 1.62～1.96 | 1.54～1.93 | 1.50～1.91 |
| Grain-size/μ m | 8～20 | 2～6 | 2～6 | 2～6 |
Embodiment 4～5:
Embodiment 4～5 schemes all adopt γ-Al
2O
3Fine powder and magnesite fine powder are raw material, and the granularity of two kinds of raw materials is all less than 44 μ m.The proportioning raw materials of embodiment 4～5 schemes and the lightweight magnesium-aluminum spinel raw material performance index of preparation are shown in table 3 and table 4.
Controlled oxidation aluminium and magnesium oxide quality ratio are 2.7 during embodiment 4 batchings, add pulp powder 2% in the batching.Add water 12% when mixing.Blank forming pressure is 65Mpa.Waste base after moulding, the baking is calcined 1650 ℃ of calcining temperatures, soaking time 2 hours in the small gas kiln.The average void content of the lightweight magnesium-aluminum spinel raw material of preparation is 61%, and volume density is 1.47g/cm
3
Controlled oxidation aluminium and magnesium oxide quality ratio are 2.7 during embodiment 5 batchings, add pulp powder 6% in the batching.Add water 10% when mixing.Blank forming pressure is 65Mpa.Waste base after moulding, the baking is calcined 1800 ℃ of calcining temperatures, soaking time 2 hours in the small gas kiln.The average void content of the lightweight magnesium-aluminum spinel raw material of preparation is 44%, and volume density is 1.91g/cm
3
Table 3 embodiment 4～5 scheme proportioning/mass%
| Embodiment | Embodiment 4 | Embodiment 5 |
| The magnesite fine powder | 44 | 44 |
| γ-Al 2O 3Fine powder | 56 | 56 |
| Pulp powder (adding) | 2 | 6 |
| Water (adding) | 12 | 10 |
| Al 2O 3/ MgO quality ratio | 2.7 | 2.7 |
The performance index of the lightweight material of table 4 embodiment 4～5 preparations
| Embodiment | Embodiment 4 | Embodiment 5 |
| Void content/% | 59～63 | 42～45 |
| Volume density/g/cm 3 | 1.45～1.50 | 1.85～1.97 |
Claims (5)
1. the preparation method of a lightweight magnesium-aluminum spinel raw material is characterized in that: adopt γ-Al
2O
3Fine powder and magnesite fine powder are main raw material, and both proportionings are 2.7～4.0 to carry out by aluminum oxide and magnesium oxide quality ratio, and organic bond and water mix evenly; Adopt semi-dry pressing, the base substrate after the baking 1650～1800 ℃ of calcinings, is incubated 2～4 hours.
2. the preparation method of a kind of lightweight magnesium-aluminum spinel raw material according to claim 1 is characterized in that: MgO mass content 〉=46% in the described magnesite fine powder.
3. the preparation method of a kind of lightweight magnesium-aluminum spinel raw material according to claim 1 is characterized in that: described γ-Al
2O
3The Al of fine powder
2O
3Mass content 〉=98%.
4. the preparation method of a kind of lightweight magnesium-aluminum spinel raw material according to claim 1, it is characterized in that: described organic bond is dextrine powder or pulp powder, its add-on is 2%～6% of a raw material gross weight.
5. the preparation method of a kind of lightweight magnesium-aluminum spinel raw material according to claim 1, it is characterized in that: the add-on of described water is 10%～15% of a raw material gross weight.
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|---|---|---|---|---|
| CN102161591A (en) * | 2010-12-23 | 2011-08-24 | 河南科技大学 | Lightweight calcium hexaluminate-magnesia alumina spinel composite microporous refractory aggregate and preparation method thereof |
| CN102424594A (en) * | 2011-09-19 | 2012-04-25 | 武汉科技大学 | MgAl2O4 / MgO-SiC-C composite refractory material and preparation method thereof |
| CN102850044A (en) * | 2012-09-24 | 2013-01-02 | 武汉科技大学 | Light cordierite-spinel castable and preparation method thereof |
| CN103833383A (en) * | 2012-11-26 | 2014-06-04 | 东北大学 | Corundum-magnesium aluminum spinelle-textured refractory aggregate with closed-hole structure and preparation method of refractory aggregate |
| CN105837251A (en) * | 2016-03-28 | 2016-08-10 | 武汉科技大学 | Macroporous magnesium aluminum spinel raw material and preparation method thereof |
| CN106396728A (en) * | 2016-09-08 | 2017-02-15 | 河南容安热工新材料有限公司 | Wet-process sintering production method for microporous spinel |
| CN107285806A (en) * | 2017-07-28 | 2017-10-24 | 武汉科技大学 | Porous corundum magnesium-aluminum spinel ceramic of nano aperture and preparation method thereof |
| CN110062749A (en) * | 2016-12-08 | 2019-07-26 | 西门子股份公司 | Corrosion resistant ceramic material, powder, mud and component |
| CN110282987A (en) * | 2019-07-03 | 2019-09-27 | 辽宁科技大学 | The manufacturing method of vanadium-nitrogen alloy sintering furnace magnesium aluminate spinel vacuum insulating brick |
| CN111943652A (en) * | 2020-08-22 | 2020-11-17 | 郑州经纬科技实业有限公司 | Preparation method of aluminum-magnesium light refractory material |
| CN111995417A (en) * | 2020-08-21 | 2020-11-27 | 浙江锦诚新材料股份有限公司 | Magnesium aluminate spinel castable for aluminum melting furnace |
| CN112250449A (en) * | 2020-09-15 | 2021-01-22 | 辽宁东和新材料股份有限公司 | Synthetic method of light-burned magnesia-alumina spinel intermediate |
| CN112250448A (en) * | 2020-09-15 | 2021-01-22 | 辽宁东和新材料股份有限公司 | Synthetic method for producing light-burned magnesia-alumina spinel by one-step method |
| CN112266241A (en) * | 2020-11-03 | 2021-01-26 | 江苏省陶瓷研究所有限公司 | Magnesium aluminate spinel porous ceramic and preparation method thereof |
| CN112279637A (en) * | 2020-11-03 | 2021-01-29 | 江苏省陶瓷研究所有限公司 | Alumina fiber-magnesia-alumina spinel porous ceramic and preparation method thereof |
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| CN102161591A (en) * | 2010-12-23 | 2011-08-24 | 河南科技大学 | Lightweight calcium hexaluminate-magnesia alumina spinel composite microporous refractory aggregate and preparation method thereof |
| CN102424594A (en) * | 2011-09-19 | 2012-04-25 | 武汉科技大学 | MgAl2O4 / MgO-SiC-C composite refractory material and preparation method thereof |
| CN102850044A (en) * | 2012-09-24 | 2013-01-02 | 武汉科技大学 | Light cordierite-spinel castable and preparation method thereof |
| CN102850044B (en) * | 2012-09-24 | 2014-02-26 | 武汉科技大学 | Light cordierite-spinel castable and preparation method thereof |
| CN103833383A (en) * | 2012-11-26 | 2014-06-04 | 东北大学 | Corundum-magnesium aluminum spinelle-textured refractory aggregate with closed-hole structure and preparation method of refractory aggregate |
| CN105837251B (en) * | 2016-03-28 | 2018-05-29 | 武汉科技大学 | A kind of grand hole magnesium-aluminum spinel raw material and preparation method thereof |
| CN105837251A (en) * | 2016-03-28 | 2016-08-10 | 武汉科技大学 | Macroporous magnesium aluminum spinel raw material and preparation method thereof |
| CN106396728A (en) * | 2016-09-08 | 2017-02-15 | 河南容安热工新材料有限公司 | Wet-process sintering production method for microporous spinel |
| CN110062749A (en) * | 2016-12-08 | 2019-07-26 | 西门子股份公司 | Corrosion resistant ceramic material, powder, mud and component |
| US11834377B2 (en) | 2016-12-08 | 2023-12-05 | Siemens Energy Global GmbH & Co. KG | Erosion-resistant ceramic material, powder, slip and component |
| CN107285806A (en) * | 2017-07-28 | 2017-10-24 | 武汉科技大学 | Porous corundum magnesium-aluminum spinel ceramic of nano aperture and preparation method thereof |
| CN107285806B (en) * | 2017-07-28 | 2020-01-24 | 武汉科技大学 | Porous corundum-magnesium aluminate spinel ceramic with nano-aperture and preparation method thereof |
| CN110282987A (en) * | 2019-07-03 | 2019-09-27 | 辽宁科技大学 | The manufacturing method of vanadium-nitrogen alloy sintering furnace magnesium aluminate spinel vacuum insulating brick |
| CN111995417B (en) * | 2020-08-21 | 2022-10-25 | 浙江锦诚新材料股份有限公司 | Magnesium aluminate spinel castable for aluminum melting furnace |
| CN111995417A (en) * | 2020-08-21 | 2020-11-27 | 浙江锦诚新材料股份有限公司 | Magnesium aluminate spinel castable for aluminum melting furnace |
| CN111943652A (en) * | 2020-08-22 | 2020-11-17 | 郑州经纬科技实业有限公司 | Preparation method of aluminum-magnesium light refractory material |
| CN112250448A (en) * | 2020-09-15 | 2021-01-22 | 辽宁东和新材料股份有限公司 | Synthetic method for producing light-burned magnesia-alumina spinel by one-step method |
| CN112250449A (en) * | 2020-09-15 | 2021-01-22 | 辽宁东和新材料股份有限公司 | Synthetic method of light-burned magnesia-alumina spinel intermediate |
| CN112266241A (en) * | 2020-11-03 | 2021-01-26 | 江苏省陶瓷研究所有限公司 | Magnesium aluminate spinel porous ceramic and preparation method thereof |
| CN112279637A (en) * | 2020-11-03 | 2021-01-29 | 江苏省陶瓷研究所有限公司 | Alumina fiber-magnesia-alumina spinel porous ceramic and preparation method thereof |
| CN112573935A (en) * | 2021-01-08 | 2021-03-30 | 郑州大学 | Preparation method of forsterite-magnalium spinel heat-insulating refractory material |
| CN112573935B (en) * | 2021-01-08 | 2022-06-21 | 郑州大学 | Preparation method of forsterite-magnalium spinel heat-insulating refractory material |
| CN113943167A (en) * | 2021-12-02 | 2022-01-18 | 湖南湘钢瑞泰科技有限公司 | RH dip pipe castable and preparation method thereof |
| CN113943167B (en) * | 2021-12-02 | 2022-12-27 | 湖南湘钢瑞泰科技有限公司 | RH dip pipe castable and preparation method thereof |
| CN116239396A (en) * | 2023-05-10 | 2023-06-09 | 东台市圣德尔耐热材料有限公司 | Preparation process of light refractory brick for kiln |
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