CN105418083A - Spinel material and manufacturing method thereof - Google Patents
Spinel material and manufacturing method thereof Download PDFInfo
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- CN105418083A CN105418083A CN201410477320.6A CN201410477320A CN105418083A CN 105418083 A CN105418083 A CN 105418083A CN 201410477320 A CN201410477320 A CN 201410477320A CN 105418083 A CN105418083 A CN 105418083A
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- spinel
- magnesia
- manufacturing
- spinel material
- fused alumina
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Abstract
The invention relates to a fireproof material, particularly a manufacturing method for a spinel material. The invention solves the technical problem that a conventional cast steel furnace material in the market is relatively low in melting point, relatively poor in thermal stability and low in slag resistance. In order to achieve the purpose, the technical scheme is that the spinel material is characterized by comprising the components in percentage by weight: 65-95% of white corundum and 5-35% of magnesite. The spinel material and the manufacturing method thereof provided by the invention have the beneficial effects that by adding magnesite in different proportions into the white corundum, magnesium aluminate spinel networks are formed among aluminium oxide particles during sintering to play a bonding role, so that the service life of a furnace liner is prolonged.
Description
Technical field
The present invention relates to a kind of refractory materials, especially a kind of spinel and preparation method thereof.
Background technology
In cast steel industry, furnace lining material can be divided into acidity, neutrality and alkaline composition:
Acid refractory is silica sand mainly, and feature is aboundresources, cheap, but SiO2 fusing point is low, and at high temperature chemically reactive is very strong, can react with the basic oxide in fusion process and even neutral oxide.Advanced industrial country is already without silica sand furnace lining, and China still has Some Enterprises to use, but can only produce low-end product reluctantly;
Amphoteric refractory is mainly corundum material, and this furnace lining purity is high, and thermal expansivity is low, but aluminum oxide fusing point is lower than magnesium oxide, and during continuous smelting heating, furnace lining is difficult to resist larger mechanical shock;
Basic lining is mainly magnesia material, and thermal expansivity is large, and heat-shock resistance is poor, easily cracks, and in easy and furnace charge, acidic oxide reacts, and is adsorbed on furnace lining surface, forms serious dross, even pollute molten steel.
During steel-making, molten steel temperature is higher, generally all more than 1600 DEG C, and the many employing alkalescence of furnace lining or amphoteric refractory.Magnesia based material thermal expansivity is large, easily cracks, and intermittent melting technology is particularly serious, usually can only be used for small boiler; Corundum material cracking resistance line and slag corrosion resistance ability are comparatively strong, but are not suitable for basic slag, and alone alumina material makes furnace lining, and sintering character is poor, and the life-span is not high yet.
Summary of the invention
The object of the invention is: conventional cast steel furnace charge is in the market improved, improve the fusing point of material and thermostability and slag resistance.
For achieving the above object, technical scheme of the present invention is: a kind of spinel, is characterized in that, the mass percent of its each component is: white fused alumina 65%-95%, magnesia 5-35%.In high-purity white fused alumina, add a certain proportion of electrosmelted magnesite clinker, form spinel structure, the chemical formula of magnesium-aluminium spinel is MgOAl2O3, and fusing point is high, melting temperature 2135 DEG C, and magnesium-aluminium spinel is all by MgO and Al2O3 synthetic.MgO and Al2O3 can be solid-solution in MA(magnesium-aluminium spinel) in, form rich magnesium or aluminium riched spinel, the eutectic temperature of they and MA is all more than 1900 DEG C, thermal expansivity is little, and thermal conductivity is low, good thermal shock stability, alkali resistant erosional competency is strong, improves the fusing point of material and thermostability and slag resistance.
Preferably, described magnesia is electrosmelted magnesite clinker, and the anti-hydratability of electrosmelted magnesite clinker is strong, and sintering degree is good, compact crystallization.
Make the making method of described spinel, it is characterized in that, comprise the steps: first white fused alumina and magnesia to be mixed in proportion stirring; Secondly raw material brickwork good for proportioning, baking are heated, be heated to sintering temperature, be incubated one to two hour.
Preferably, in described method, baking heat heat-up rate be 100 DEG C/H.
Beneficial effect of the present invention shows as: by adding the magnesia of different ratios in white fused alumina, form magnesium-aluminium spinel network during sintering between alumina particle, plays keying action, improves lining life.
Specific embodiment
The making step of this spinel is as follows:
(1) according to formula, the dry material that shakes good for proportioning by hand ramming or furnace ramming machine vibration brickwork, concrete formula rate is as shown in the table.
(2) keep the clean of brickwork instrument, place crucible, control intensity and time well according to selected brickwork mode, so that furnace lining reaches the best degree of packing.
(3) the sealing interface between top and body of heater can mix bath of glass with powder or plasticity material is sealed.
(4) converter nose part is available moldablely makes by hand, also can mix bath of glass mating mold with powder and make.
(5) when whole furnace lining material reaches best degree of compactness by vibration, get final product baker, need before baker to check hydroelectric system, can by sintering process curve baker after all are normal, sintering.With the heat-up rate of 100 DEG C/H, be heated to 1200 DEG C of insulations two hours, between this stage oxidation aluminium and magnesium oxide powder, start to form spinel network, then rise to 1700 DEG C, be incubated two hours, constitutionally stable spinel structure can be obtained.
Claims (4)
1. a spinel, is characterized in that, the mass percent of its each component is:
White fused alumina 65%-95%,
Magnesia 5-35%.
2. spinel according to claim 1, is characterized in that, described magnesia is electrosmelted magnesite clinker.
3. a making method for spinel according to claim 1, is characterized in that, comprises the steps:
By following weight proportion by white fused alumina and magnesia mix and blend: white fused alumina 65%-95%, magnesia 5-35%;
Raw material brickwork good for proportioning, baking are heated, is heated to sintering temperature, is incubated one to two hour.
4. the making method of spinel according to claim 3, is characterized in that:
Baking heat heat-up rate be 100 DEG C/H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410477320.6A CN105418083A (en) | 2014-09-18 | 2014-09-18 | Spinel material and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410477320.6A CN105418083A (en) | 2014-09-18 | 2014-09-18 | Spinel material and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105418083A true CN105418083A (en) | 2016-03-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410477320.6A Pending CN105418083A (en) | 2014-09-18 | 2014-09-18 | Spinel material and manufacturing method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN105418083A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109503213A (en) * | 2018-08-29 | 2019-03-22 | 泰州市海创新能源研究院有限公司 | A method of strengthening high temperature furnace furnace wall fire resistance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948300A (en) * | 2010-08-26 | 2011-01-19 | 武汉科技大学 | Corundum-spinel lightweight heat-insulating material and preparation method thereof |
| CN102718516A (en) * | 2012-07-18 | 2012-10-10 | 山国强 | Steel ladle gunning material |
| CN103553643A (en) * | 2013-09-30 | 2014-02-05 | 萍乡市京祥实业有限公司 | Compact electro-fused corundum-spinel ladle casting material |
-
2014
- 2014-09-18 CN CN201410477320.6A patent/CN105418083A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948300A (en) * | 2010-08-26 | 2011-01-19 | 武汉科技大学 | Corundum-spinel lightweight heat-insulating material and preparation method thereof |
| CN102718516A (en) * | 2012-07-18 | 2012-10-10 | 山国强 | Steel ladle gunning material |
| CN103553643A (en) * | 2013-09-30 | 2014-02-05 | 萍乡市京祥实业有限公司 | Compact electro-fused corundum-spinel ladle casting material |
Non-Patent Citations (1)
| Title |
|---|
| 郭海珠 等: "《实用耐火原料手册》", 30 September 2000, 中国建材工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109503213A (en) * | 2018-08-29 | 2019-03-22 | 泰州市海创新能源研究院有限公司 | A method of strengthening high temperature furnace furnace wall fire resistance |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160323 |
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| WD01 | Invention patent application deemed withdrawn after publication |