CN108585824A - A kind of preparation method of magnesium-aluminum spinel raw material - Google Patents
A kind of preparation method of magnesium-aluminum spinel raw material Download PDFInfo
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- CN108585824A CN108585824A CN201810440686.4A CN201810440686A CN108585824A CN 108585824 A CN108585824 A CN 108585824A CN 201810440686 A CN201810440686 A CN 201810440686A CN 108585824 A CN108585824 A CN 108585824A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
- C04B35/443—Magnesium aluminate spinel
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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Abstract
A kind of preparation method of magnesium-aluminum spinel raw material, is related to Material Field, by the present invention in that with weight-loss metering scale by Al2O3With MgO rational proportions, then will proportioning material through feeding, melting, pick, broken, screening, it is levigate after form required magnesium-aluminum spinel raw material, the present invention has operating procedure simple, the magnesium-aluminum spinel raw material impurity content of acquisition is low, the features such as high-temperature behavior is good is suitble to large-scale promotion and application.
Description
Technical field
The present invention relates to Material Fields, and in particular to a kind of preparation method of magnesium-aluminum spinel raw material.
Background technology
Known, magnesium aluminate spinel belongs to a kind of magnesium aluminum oxide, and main component is aluminium oxide and magnesia, magnalium point
Spar naturally occur with artificial synthesized two kinds, chemical formula MgAl2O4Or MgO Al2O3, magnesium aluminate spinel density is
3.58g/cm3, Mohs' hardness 8, fusing point is 2135 DEG C, is the primary raw material of higher melting-point refractory material, thermal coefficient
（1000℃）For 5.82W/ (m.k), on linear expansion coefficient（20-1000℃）It is 7.6 × 10-6℃-1, close with corundum, analogy
Magnesite it is much smaller, elasticity modulus is also obviously smaller than periclase.Magnesium aluminate spinel iron-resistant slag, K2O and Na2The sulfate attack of O
Property strong and thermal shock resistance it is good, reducing atmosphere lower volume excellent in stability and the anti-CO that dissociates2、SO2And SO3Aggressivity it is good.
China started to use alumina and magnesite (or light-burned MgO) synthetic MgAl spinal raw material in the 1980s.Closely
Nian Lai has also carried out a series of researchs for producing magnesium aluminate spinel combination magnesian product technique, achieves many achievements, but property
The excellent high-purity product of energy is but suffered from always high firing temperature and is restricted.
The refractory material researcher and expert of domestic certain large iron and steel enterprises develop and apply magnesium aluminate spinel and do not burn
Brick.The produce reality that brickkiln is returned by active lime, has developed Magnesia-alumina spinel unburned brick.Use the magnesium for showing development
Aluminate unburned brick Active Lime Rotary Kiln firing service life up to 1 year or more.For a long time, magnesium chromium is bound directly
Brick has excellent resistance to slag and erosion resisting by dry, is widely used in large-scale alkaline rotary kiln.But with the day of environmental issue
Beneficial serious, the Cr VI that magnesium chromium product generates after use has become universally acknowledged problem, for this purpose, research spalling resistance is good,
Low thermal expansion organizes de-ization less and erosion resistant magnalium series refractory material, as the best alternative materials of magnesium chromium series refractory material
Applied to alkaline rotary kiln.From after unshape refractory appearance early 20th century, just gradually obtained widely in metallurgy industry
Using.Currently, the indefinite form fire resisting yield of some industrially developed country almost accounts for the half of refractory material total amount, steel industry is answered
With widest in area, the use of maximum refractory material be the resistance to material of magnalium system indefinite form, account for about the 85% of the indefinite form production of resistance to material,
It is widely used in converter, ladle, Tie Bao, heating furnace and blast furnace, almost spreads all metallurgical Thermal Equipments etc..Due to natural aluminium
Magnesia spinel seldom finds that the magnesium aluminate spinel industrially applied is entirely artificial synthesized, therefore it provides a kind of magnalium is sharp
The preparation method of spar raw material is just at the long-term technology demand of those skilled in the art.
Invention content
It is insufficient to overcome present in background technology, the present invention provides a kind of preparation method of magnesium-aluminum spinel raw material,
By the present invention in that with weight-loss metering scale by Al2O3With MgO rational proportions, then proportioning is expected through feeding, melting, pick, is broken
Magnesium-aluminum spinel raw material needed for broken, screening, levigate rear formation, the present invention have operating procedure simple, the magnalium point crystalline substance of acquisition
Stone raw material impurity content is low, and high-temperature behavior is good etc..
To realize that goal of the invention as described above, the present invention use technical solution as described below：
A kind of preparation method of magnesium-aluminum spinel raw material, the production method specifically comprise the following steps：
The first step, first by Al2O3The feed bin sent to melting electric arc furnaces is promoted after weight-loss metering scale dispensing with MgO, then
Be sent in melting electric arc furnaces after 2000 DEG C~3000 DEG C high temperature carry out melting, melt is poured into connect hired car be transported to cooling zone into
Row cooling；
Second step takes the next step, and bulk frit is poured out from connecing in hired car, with weight fritter is pounded into after cooling, then using broken
Machine be tentatively crushed, and obtains the material of certain particle size；
Third step takes the next step, and the material of above-mentioned certain particle size is delivered to screen(ing) machine platform by elevator to be sieved, and obtains four
The section sand of kind particle size range, respectively enters different feed bins；
4th step takes the next step, and the material of 1~3mm granularities enters finished product bin, the object of 5~10mm granularities and 10~25mm granularities
Material respectively enters double-roll crusher and be crushed for the second time, and broken material returns to screening platform by elevator and carries out again
Screening；
5th step takes the next step, and the materials of 0~5mm granularities enters band sieve ball mill and carries out levigate, is then lifted out rear magnetic separation screening,
Obtain the section sand of 0~1mm granularities, 0~0.2mm granularities, 0.2~0.5mm granularities, 0.5~1mm granularities；
6th step takes the next step, and the material of 0~0.2mm granularities is delivered to the primary screening of screen(ing) machine platform progress by elevator and obtains 0
The section sand of~0.08mm granularities and 0.08~0.2mm granularities, 0~1mm granularities, 0.2~0.5mm granularities, 0.5~1mm granularities
Section sand enters finished product bin as finished product；
7th step takes the next step, and the section sand of 0.08~0.2mm granularities obtains number sand of 180# and 80# into passing through to sieve again, 0~
The section sand of 0.08mm granularities obtains 325 mesh fine powders and 240# sand through sieving again, is then sent respectively to specified finished bin and is waited for
Packaging；
8th step takes the next step, material other than required granularity product send it is levigate to ball mill, then after hierarchy system is classified
It is promoted to the spinelle fine powder of 200 mesh or 325 mesh to finished bin, return to ball mill more than the material of 200 mesh or 325 mesh grinds again
Carefully.
The preparation method of the magnesium-aluminum spinel raw material, Al in the first step2O3Content be 50%~90%, MgO
Content is 10%~50%.
The preparation method of the magnesium-aluminum spinel raw material, melting electric arc furnaces is a diameter of 5.2 meters in the first step
360KVA Dumpage types melt electric arc furnaces.
The preparation method of the magnesium-aluminum spinel raw material, the raw material of MgO is magnesite, magnesia unslacked in the first step
Any one in sand, magnesia, magnesium carbonate, magnesium hydroxide.
The preparation method of the magnesium-aluminum spinel raw material, Al in the first step2O3Raw material be commercial alumina, hydrogen
Aluminium oxide, bauxite raw material, the light-burned material of bauxite, bauxite somehow in any one.
The preparation method of the magnesium-aluminum spinel raw material, crusher is jaw crusher in the second step.
The preparation method of the magnesium-aluminum spinel raw material, elevator is bucket elevator during the third walks.
Using technical solution as described above, the present invention has superiority as described below：
By the present invention in that with weight-loss metering scale by Al2O3With MgO rational proportions, then proportioning is expected through feeding, melting, inspection
Choosing is crushed, sieves, the magnesium-aluminum spinel raw material needed for levigate rear formation, and the present invention is simple with operating procedure, the magnalium of acquisition
The features such as spinel charge impurity content is low, and high-temperature behavior is good is suitble to large-scale promotion and application.
Specific implementation mode
The present invention can be explained in more detail by the following examples, the invention is not limited in the following examples；
A kind of preparation method of magnesium-aluminum spinel raw material of the present invention, the production method specifically comprise the following steps：
The first step, first by Al2O3The feed bin sent to melting electric arc furnaces is promoted after weight-loss metering scale dispensing with MgO, then
Be sent in melting electric arc furnaces after 2000 DEG C~3000 DEG C high temperature carry out melting, melt is poured into connect hired car be transported to cooling zone into
Row cooling；The Al2O3Content be 50%~90%, MgO content be 10%~50%；It should be noted that Al2O3Content
Refer to that the content for 50%~90%, the MgO for accounting for total amount also refers to account for the 10%~50% of total amount for 50%~90%；The melting electric arc
The 360KVA Dumpage types that stove is a diameter of 5.2 meters melt electric arc furnaces；The raw material of the MgO be magnesite, caustic-calcined magnesite, magnesia,
Any one in magnesium carbonate, magnesium hydroxide；The Al2O3Raw material be commercial alumina, aluminium hydroxide, bauxite raw material, aluminium
The light-burned material of alumina, bauxite somehow in any one；
Second step takes the next step, and bulk frit is poured out from connecing in hired car, with weight fritter is pounded into after cooling, then using broken
Machine be tentatively crushed, and obtains the material of certain particle size；The crusher is jaw crusher；
Third step takes the next step, and the material of above-mentioned certain particle size is delivered to screen(ing) machine platform by elevator to be sieved, and obtains four
The section sand of kind particle size range, respectively enters different feed bins；The elevator is bucket elevator；
4th step takes the next step, and the material of 1~3mm granularities enters finished product bin, the object of 5~10mm granularities and 10~25mm granularities
Material respectively enters double-roll crusher and be crushed for the second time, and broken material returns to screening platform by elevator and carries out again
Screening；
5th step takes the next step, and the materials of 0~5mm granularities enters band sieve ball mill and carries out levigate, is then lifted out rear magnetic separation screening,
Obtain the section sand of 0~1mm granularities, 0~0.2mm granularities, 0.2~0.5mm granularities, 0.5~1mm granularities；
6th step takes the next step, and the material of 0~0.2mm granularities is delivered to the primary screening of screen(ing) machine platform progress by elevator and obtains 0
The section sand of~0.08mm granularities and 0.08~0.2mm granularities, 0~1mm granularities, 0.2~0.5mm granularities, 0.5~1mm granularities
Section sand enters finished product bin as finished product；
7th step takes the next step, and the section sand of 0.08~0.2mm granularities obtains number sand of 180# and 80# into passing through to sieve again, 0~
The section sand of 0.08mm granularities obtains 325 mesh fine powders and 240# sand through sieving again, is then sent respectively to specified finished bin and is waited for
Packaging；
8th step takes the next step, material other than required granularity product send it is levigate to ball mill, then after hierarchy system is classified
It is promoted to the spinelle fine powder of 200 mesh or 325 mesh to finished bin, return to ball mill more than the material of 200 mesh or 325 mesh grinds again
Carefully.
Very low (the MgO+Al of magnesium-aluminum spinel raw material impurity content prepared using the present invention2O3>99%) it, especially aoxidizes
The high-temperature behavior of silicone content, such spinelle is fine.
In the preparation, in order to promote the reaction and sintering of spinelle, a certain number of additives of addition may be selected in the present invention,
Such as B2O3、MgCl2、MgF2、AlF3、TiO2、Fe2O3、BC4、BaCO3, ZnO, BaO etc..
Other than the chemical composition of raw material, Al2O3Crystalline form also have a certain impact to the synthesis of spinelle.Due to γ-
Al2O3Crystal structure compared with α-Al2O3Closer to spinelle.γ- Al2O3Density compared with α-Al2O3It is small, spinelle is produced by it
The volume expansion of generation is smaller.Further, since generating γ-Al2O3Temperature it is relatively low, activity it is higher.So with γ-Al2O3Generation
For α-Al2O3It is high that spinelle content can be made, the spinelle that the porosity is low and crystallite dimension is big.
The present invention in the preparation, the proportioning of synthetic MgAl spinal, i.e. MgO/ Al2O3Than（Molar ratio）Directly affect synthesis
The performance of sand.MgO/ Al2O3When than being more than 1, with MgO/ Al2O3The particle volume density of the increase of ratio, spinelle sand gradually increases
Greatly；As MgO/ Al2O3Ratio be less than 1 when, with MgO/ Al2O3The particle volume density of the reduction of ratio, spinelle sand also gradually increases
Greatly.As MgO/ Al2O3Ratio when being equal to 1, bulk density is minimum.In addition, the composition of magnesium aluminate spinel is also with specific condition
Change and changes.Such as at high temperature Al in corundum-spinel material2O3It will continue to be dissolved and form rich magnesium point crystalline substance in spinelle
Stone, temperature reduce, and meeting precipitation goes out Al to magnesium-rich spinel again2O3。
The dispensing for producing electric smelting spinelle generally uses the form of rich magnesium, content of MgO 10%~50%, content of MgO it is excessively high or
It is too low all fusing to be made bad, cause melt viscosity height.The key for producing electric smelting spinelle is how to obtain structure uniformly to produce
Product.In general, top and periphery contain more honeycomb-like pores, wherein meeting the spinelle frit porosity of stoichiometric composition
Maximum, and richness MgO frits and addition Cr2O3The frit porosity it is relatively low.
Because magnesium aluminate spinel has good corrosion resistance, abrasion resistance, good thermal shock stability.Its main purposes
Have：
1, it is used for cement rotary kiln instead of magnesia-chrome sand manufacture Mg-Al spinel brick, not only avoids chromium public hazards, and with good
Resistance to flaking；
2, for making pouring materialfor steel ladle, the corrosion resistance of steel plate lining is greatly improved.It is set to be widely used in steel-making fire resisting
Material；
3, for regenerator chamber of glass kiln, limekiln, electric furnace furnace roof and other intensified operations Thermal Equipment；
4, good Pre-synthesized spinel is produced as unsetting and the high-purity refractory material of setting new raw material.
Part not in the detailed description of the invention is the prior art.
The embodiment selected herein for the open purpose of the present invention, is presently considered to be suitable, still, Ying Liao
Solution belongs to all changes and the improvement of the embodiment in this design and invention scope the present invention is intended to include all.
Claims (7)
1. a kind of preparation method of magnesium-aluminum spinel raw material, it is characterized in that：The production method specifically comprises the following steps：
The first step, first by Al2O3The feed bin sent to melting electric arc furnaces is promoted after weight-loss metering scale dispensing with MgO, is then sent
In to melting electric arc furnaces after 2000 DEG C~3000 DEG C high temperature carry out melting, melt is poured into and connects hired car and is transported to cooling zone progress
It is cooling；
Second step takes the next step, and bulk frit is poured out from connecing in hired car, with weight fritter is pounded into after cooling, then using broken
Machine be tentatively crushed, and obtains the material of certain particle size；
Third step takes the next step, and the material of above-mentioned certain particle size is delivered to screen(ing) machine platform by elevator to be sieved, and obtains four
The section sand of kind particle size range, respectively enters different feed bins；
4th step takes the next step, and the material of 1~3mm granularities enters finished product bin, the object of 5~10mm granularities and 10~25mm granularities
Material respectively enters double-roll crusher and be crushed for the second time, and broken material returns to screening platform by elevator and carries out again
Screening；
5th step takes the next step, and the materials of 0~5mm granularities enters band sieve ball mill and carries out levigate, is then lifted out rear magnetic separation screening,
Obtain the section sand of 0~1mm granularities, 0~0.2mm granularities, 0.2~0.5mm granularities, 0.5~1mm granularities；
6th step takes the next step, and the material of 0~0.2mm granularities is delivered to the primary screening of screen(ing) machine platform progress by elevator and obtains 0
The section sand of~0.08mm granularities and 0.08~0.2mm granularities, 0~1mm granularities, 0.2~0.5mm granularities, 0.5~1mm granularities
Section sand enters finished product bin as finished product；
7th step takes the next step, and the section sand of 0.08~0.2mm granularities obtains number sand of 180# and 80# into passing through to sieve again, 0~
The section sand of 0.08mm granularities obtains 325 mesh fine powders and 240# sand through sieving again, is then sent respectively to specified finished bin and is waited for
Packaging；
8th step takes the next step, material other than required granularity product send it is levigate to ball mill, then after hierarchy system is classified
It is promoted to the spinelle fine powder of 200 mesh or 325 mesh to finished bin, return to ball mill more than the material of 200 mesh or 325 mesh grinds again
Carefully.
2. the preparation method of magnesium-aluminum spinel raw material according to claim 1, it is characterized in that：Al in the first step2O3's
The content that content is 50%~90%, MgO is 10%~50%.
3. the preparation method of magnesium-aluminum spinel raw material according to claim 1, it is characterized in that：Electricity is melted in the first step
The 360KVA Dumpage types that arc stove is a diameter of 5.2 meters melt electric arc furnaces.
4. the preparation method of magnesium-aluminum spinel raw material according to claim 1, it is characterized in that：MgO in the first step
Raw material is any one in magnesite, caustic-calcined magnesite, magnesia, magnesium carbonate, magnesium hydroxide.
5. the preparation method of magnesium-aluminum spinel raw material according to claim 1, it is characterized in that：Al in the first step2O3's
Raw material be commercial alumina, aluminium hydroxide, bauxite raw material, the light-burned material of bauxite, bauxite somehow in any one.
6. the preparation method of magnesium-aluminum spinel raw material according to claim 1, it is characterized in that：Crusher in the second step
For jaw crusher.
7. the preparation method of magnesium-aluminum spinel raw material according to claim 1, it is characterized in that：Elevator in the third step
For bucket elevator.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112279512A (en) * | 2020-10-16 | 2021-01-29 | 蒙娜丽莎集团股份有限公司 | Wear-resistant full-polished magnesia-alumina spinel glaze as well as preparation method and application thereof |
| CN112456999A (en) * | 2020-12-01 | 2021-03-09 | 中冶焦耐(大连)工程技术有限公司 | Brick for rotary kiln burning zone and preparation method thereof |
| CN114394820A (en) * | 2021-12-29 | 2022-04-26 | 北京金隅通达耐火技术有限公司 | Magnesia-alumina spinel sintered by waste magnesia-alumina brick powder and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112279512A (en) * | 2020-10-16 | 2021-01-29 | 蒙娜丽莎集团股份有限公司 | Wear-resistant full-polished magnesia-alumina spinel glaze as well as preparation method and application thereof |
| CN112456999A (en) * | 2020-12-01 | 2021-03-09 | 中冶焦耐(大连)工程技术有限公司 | Brick for rotary kiln burning zone and preparation method thereof |
| CN114394820A (en) * | 2021-12-29 | 2022-04-26 | 北京金隅通达耐火技术有限公司 | Magnesia-alumina spinel sintered by waste magnesia-alumina brick powder and preparation method thereof |
| CN114394820B (en) * | 2021-12-29 | 2022-11-08 | 北京金隅通达耐火技术有限公司 | Magnesia-alumina spinel sintered by waste magnesia-alumina brick powder and preparation method thereof |
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