CN103922763A - Electric melting magnesium-aluminum-chromium synthesis material and production method thereof - Google Patents
Electric melting magnesium-aluminum-chromium synthesis material and production method thereof Download PDFInfo
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- CN103922763A CN103922763A CN201410102081.6A CN201410102081A CN103922763A CN 103922763 A CN103922763 A CN 103922763A CN 201410102081 A CN201410102081 A CN 201410102081A CN 103922763 A CN103922763 A CN 103922763A
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- chromium
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Abstract
The invention relates to an electric melting magnesium-aluminum-chromium synthesis material and a production method thereof, wherein the electric melting magnesium-aluminum-chromium synthesis material comprises, by mass, 25-58% of Al2O3, 3-9% of Cr2O3, 29-65% of MgO and less than or equal to 4% of impurities. The steps comprise: taking chromium residue and light-burned magnesia as raw materials, carrying out crushing and mixing, adding to an electric arc furnace, carrying out electrifying heating to make the mixed material melt, cooling, solidifying into blocks, carrying out breaking sorting, removing the slag skull material, and carrying out sorting and magnetic separation to obtain the electric melting magnesium-aluminum-chromium synthesis material. According to the present invention, the process is simple, and Na2O and other impurities in the chromium residue can be effectively removed through electric melting, such that the product provides high erosion resistance for the molten slag; and the chromium residue is adopted as the raw material, the raw material cost is low, the pollution of the waste residue stacking on the environment is reduced, the light-burned magnesia is adopted as the magnesium source, and the light-burned magnesia has characteristics of high activity, low cost and low impurity content, and easily reacts with the chromium residue to produce the magnesium-aluminum-chromium spinel.
Description
Technical field
The present invention relates to a kind of electrocast refractories production method, particularly relate to a kind of electric melting magnesium-aluminium chromium synthetic material and production method thereof.
Background technology
Current in metallurgy industry, the strong refractory materials of anti-slag penetration ability has magnesium carbonaceous, magnesium chromium matter and refractory magnesia-alumina material.With regard to steel industry, the carbon of magnesia carbon refractory easily enters in molten steel, affects the quality of molten steel, and magnesium chrome refractory, in use Cr
2o
3enter in slag, can improve the viscosity of solution, slow down the infiltration of slag to magnesium chromium matter refractory product, the refractory materials of magnesium chrome refractory metallurgy industry first-selection.
At present, magnesium chrome refractory generally adopts chrome ore, and chrome ore price is more expensive, and production cost is higher.Chromium slag is the waste residue that thermite process is produced chromium metal, contains Al in chromium slag
2o
3, Cr
2o
3more than 95wt%, but in chromium slag, foreign matter content is unstable, easily cause unstable product quality using chromium slag as refractory materials, and the chromium metal containing in chromium slag, directly use and easily cause expansion and the short texture problem that secondary oxidation brings as refractory materials, cause it directly to apply and be restricted.
Summary of the invention
The technical problem to be solved in the present invention has been to provide a kind of electric melting magnesium-aluminium chromium synthetic material and production method thereof, taking chromium slag as raw material, reduce raw materials cost, the impurity and the chromium metal that have solved in chromium slag easily cause expansion and the short texture problem that secondary oxidation brings, and improve resistance to slag corrosion.
Technical scheme of the present invention is:
A kind of electric melting magnesium-aluminium chromium synthetic material, consists of the following composition according to mass percentage content:
Al
2O
3 25%～58%；
Cr
2O
3 3%～9%；
MgO 29% ～65%；
Foreign matter content≤4%;
Na in impurity
2mass percent component concentration≤0.5% of O, Fe
2o
3mass percent component concentration≤0.5%, SiO
2mass percent component concentration≤1.0%.
A production method for electric melting magnesium-aluminium chromium synthetic material, its concrete steps are as follows:
A. starting material and processing
Getting chromium slag and light calcined magnesia is raw material, and described chromium slag is containing Al
2o
3mass percent 78%～84%, containing Cr
2o
3mass percent 10%～13%, pulverizes chromium slag, and the granularity of pulverizing is≤10mm; Described light calcined magnesia is containing MgO mass percent>=85%, and the granularity that light calcined magnesia is pulverized is≤10mm;
B. batch mixing
By weight percentage, by mixing with 30%～70% light calcined magnesia through pulverizing 30%～70% chromium slag, obtain compound;
C. electric smelting
Compound is joined in electric arc furnace, and energising is heated and made compound melting, the melt temperature of compound is 2000 DEG C～3000 DEG C, after compound fusing, stops heating, and the fusion time is 30min～45min;
D. cooling and sorting
Synthetic material 36h～the 48h that cools in electric arc furnace, is frozen into piece, obtains synthetic material; Synthetic material is beaten broken, sorting, removes slag crust material;
E. removal of impurities is processed and processing,
Remove impurity and carbon granules by choosing through the synthetic material of sorting, and iron removal by magnetic separation, electric melting magnesium-aluminium chromium synthetic material obtained.
When sorting, be one-level material piece at synthetic material near the electrode region of electric arc furnace, be secondary material piece around one-level material piece, and all the other are slag crust material.
When batch mixing, choose by weight percentage chromium slag 70% and light calcined magnesia 30% and carry out batch mixing, in sour environment, use being adapted at.
Choose by weight percentage chromium slag 70% and light calcined magnesia 30% and carry out batch mixing, when sorting, the electrode region volume density > 3.45g/cm at synthetic material near electric arc furnace
3for one-level material piece, around one-level material piece, volume density is 3.35g/cm
3～3.45g/cm
3for secondary material piece, all the other are slag crust material.
When batch mixing, choose by weight percentage chromium slag 30% and light calcined magnesia 70% and carry out batch mixing, in alkaline environment, use being adapted at.
Choose by weight percentage chromium slag 30% and light calcined magnesia 70% and carry out batch mixing, when sorting, the electrode region volume density>=3.2g/cm at synthetic material near electric arc furnace
3for one-level material piece, around one-level material piece, volume density is 3.10g/cm
3～3.19g/cm
3for secondary material piece, all the other are slag crust material.
The present invention has useful effect:
1, taking chromium slag as raw material, raw materials cost is low, improved the utilization ratio of raw material, has reduced the be rivals in a contest pollution of environment of slag dump, and using light calcined magnesia as magnesium source, light calcined magnesia is active large, and cost is low, and foreign matter content is low, when electric smelting more easily and the principal constituent Cr of chromium slag
2o
3with Al
2o
3reaction generates Mg-Al-Cr spinel.
2, technique is simple, by electric smelting, can effectively remove the Na in chromium slag
2the impurity such as O, and make the chromium metal in chromium slag oxidized, avoid the expansion that in use procedure, secondary oxidation brings and short texture problem, make product there is very high corrosion resistance for slag.
3, the Cr in raw material
2o
3with Al
2o
3have identical crystalline network, the two has formed continuous solid solution by melting, Cr
2o
3can replace part Al
2o
3be solidly soluted in magnesium-aluminium spinel, form complex phase spinel structure, there is good thermal shock resistance, slag resistance and high temperature strength.
Chemical composition and the physical index of this electric melting magnesium-aluminium chromium synthetic material are as shown in table 1:
The physical and chemical index of table 1 electric melting magnesium-aluminium chromium of the present invention synthetic material
Embodiment
Embodiment 1
A. starting material and processing
Getting chromium slag and light calcined magnesia is raw material, and described chromium slag is containing Al
2o
3mass percent 78%～84%, containing Cr
2o
3mass percent 10%～13%, pulverizes chromium slag, the granularity≤10mm of pulverizing; Described light calcined magnesia is containing MgO mass percent>=85%, by the granularity≤10mm of light calcined magnesia pulverizing;
B. batch mixing
By weight percentage, the chromium slag of 8.4t granularity≤10mm is mixed with the light calcined magnesia of 3.6t granularity≤10mm, obtain compound;
C. electric smelting
Compound is joined in electric arc furnace, and energising is heated and made compound melting, the melt temperature of compound is 2000 DEG C～3000 DEG C, after compound fusing, stops heating, and the fusion time is 45min;
D. cooling and sorting
The synthetic material 48h that cools in electric arc furnace, is frozen into piece, obtains synthetic material; Synthetic material is beaten broken, sorting, at synthetic material central section volume density > 3.45g/cm
3for one-level material piece, around synthetic material central section, volume density is 3.35g/cm
3～3.45g/cm
3for secondary material piece, all the other are slag crust material;
E. removal of impurities is processed and processing,
One-level material piece through sorting and secondary material piece are chosen to removal impurity and carbon granules, and iron removal by magnetic separation, obtain electric melting magnesium-aluminium chromium synthetic material, can need to be processed into desired particle size according to using, product chemical composition and physical index are as shown in table 2; Slag crust material melts down remelting.
Embodiment 2
A. starting material and processing
Getting chromium slag and light calcined magnesia is raw material, and described chromium slag is containing Al
2o
3mass percent 78%～84%, containing Cr
2o
3mass percent 10%～13%, pulverizes chromium slag, and the granularity of pulverizing is≤10mm; Described light calcined magnesia is containing MgO mass percent>=85%, and the granularity that light calcined magnesia is pulverized is≤10mm;
B. batch mixing
By weight percentage, the light calcined magnesia of the chromium slag of 6t granularity≤10mm and 6t granularity≤10mm is mixed, obtain compound;
C. electric smelting
Compound is joined in electric arc furnace, and energising is heated and made compound melting, the melt temperature of compound is 2000 DEG C～3000 DEG C, after compound fusing, stops heating, and the fusion time is 30min;
D. cooling and sorting
The synthetic material 36h that cools in electric arc furnace, is frozen into piece, obtains synthetic material; Synthetic material is beaten broken, sorting, at synthetic material central section volume density>=3.3g/cm
3for one-level material piece, around synthetic material central section, volume density is 3.21g/cm
3～3.29g/cm
3for secondary material piece, all the other are slag crust material;
E. removal of impurities is processed and processing,
One-level material piece through sorting and secondary material piece are chosen to removal impurity and carbon granules, and iron removal by magnetic separation, obtain electric melting magnesium-aluminium chromium synthetic material, can need to be processed into desired particle size according to using, product chemical composition and physical index are as shown in table 2; Slag crust material melts down remelting.
Embodiment 3
A. starting material and processing
Getting chromium slag and light calcined magnesia is raw material, and described chromium slag is containing Al
2o
3mass percent 78%～84%, containing Cr
2o
3mass percent 10%～13%, pulverizes chromium slag, and the granularity of pulverizing is≤10mm; Described light calcined magnesia is containing MgO mass percent>=85%, and the granularity that light calcined magnesia is pulverized is≤10mm;
B. batch mixing
By weight percentage, by mixing with the light calcined magnesia of 8.4t granularity≤10mm through the chromium slag of pulverizing 3.6t granularity≤10mm, obtain compound;
C. electric smelting
Compound is joined in electric arc furnace, and energising is heated and made compound melting, the melt temperature of compound is 2000 DEG C～3000 DEG C, after compound fusing, stops heating, and the fusion time is 40min;
D. cooling and sorting
The synthetic material 40h that cools in electric arc furnace, is frozen into piece, obtains synthetic material; Synthetic material is beaten broken, sorting, at synthetic material central section volume density>=3.2g/cm
3for one-level material piece, around synthetic material central section, volume density is 3.10g/cm
3～3.29g/cm
3for secondary material piece, all the other are slag crust material;
E. removal of impurities is processed and processing
One-level material piece through sorting and secondary material piece are chosen to removal impurity and carbon granules, and iron removal by magnetic separation, obtain electric melting magnesium-aluminium chromium synthetic material, can need to be processed into desired particle size according to using, product chemical composition and physical index are as shown in table 2; Slag crust material melts down remelting.
The physical and chemical index of the electric melting magnesium-aluminium chromium synthetic material of table 2 embodiment of the present invention 1～embodiment 3
Claims (7)
1. an electric melting magnesium-aluminium chromium synthetic material, is characterized in that: consist of the following composition according to mass percentage content:
Al
2O
3 25%～58%；
Cr
2O
3 3%～9%；
MgO 29% ～65%；
Foreign matter content≤4%;
Na in impurity
2mass percent component concentration≤0.5% of O, Fe
2o
3mass percent component concentration≤0.5%, SiO
2mass percent component concentration≤1.0%.
2. the production method of a kind of electric melting magnesium-aluminium chromium synthetic material as claimed in claim 1, is characterized in that: concrete steps are as follows:
A. starting material and processing
Getting chromium slag and light calcined magnesia is raw material, and described chromium slag is containing Al
2o
3mass percent 78%～84%, containing Cr
2o
3mass percent 10%～13%, pulverizes chromium slag, and the granularity of pulverizing is≤10mm; Described light calcined magnesia is containing MgO mass percent>=85%, and the granularity that light calcined magnesia is pulverized is≤10mm;
B. batch mixing
By weight percentage, by mixing with 30%～70% light calcined magnesia through pulverizing 30%～70% chromium slag, obtain compound;
C. electric smelting
Compound is joined in electric arc furnace, and energising is heated and made compound melting, the melt temperature of compound is 2000 DEG C～3000 DEG C, after compound fusing, stops heating, and the fusion time is 30min～45min;
D. cooling and sorting
Synthetic material 36h～the 48h that cools in electric arc furnace, is frozen into piece, obtains synthetic material; Synthetic material is beaten broken, sorting, removes slag crust material;
E. removal of impurities is processed and processing,
Remove impurity and carbon granules by choosing through the synthetic material of sorting, and iron removal by magnetic separation, electric melting magnesium-aluminium chromium synthetic material obtained.
3. the production method of electric melting magnesium-aluminium chromium synthetic material according to claim 2, is characterized in that: when sorting, be one-level material piece at synthetic material near the electrode region of electric arc furnace, be secondary material piece around one-level material piece, and all the other are slag crust material.
4. the production method of electric melting magnesium-aluminium chromium synthetic material according to claim 2, is characterized in that: when batch mixing, choose by weight percentage chromium slag 70% and light calcined magnesia 30% and carry out batch mixing.
5. the production method of electric melting magnesium-aluminium chromium synthetic material according to claim 4, is characterized in that: when sorting, and the electrode region volume density > 3.45g/cm at synthetic material near electric arc furnace
3for one-level material piece, around one-level material piece, volume density is 3.35g/cm
3～3.45g/cm
3for secondary material piece, all the other are slag crust material.
6. the production method of electric melting magnesium-aluminium chromium synthetic material according to claim 2, is characterized in that: when batch mixing, choose by weight percentage chromium slag 30% and light calcined magnesia 70% and carry out batch mixing.
7. the production method of electric melting magnesium-aluminium chromium synthetic material according to claim 6, is characterized in that: when sorting, and the electrode region volume density>=3.2g/cm at synthetic material near electric arc furnace
3for one-level material piece, around one-level material piece, volume density is 3.10g/cm
3～3.19g/cm
3for secondary material piece, all the other are slag crust material.
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|---|---|---|---|
| CN201410102081.6A CN103922763B (en) | 2014-03-19 | 2014-03-19 | Electric melting magnesium-aluminum-chromium synthesis material and production method thereof |
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|---|---|---|---|
| CN201410102081.6A CN103922763B (en) | 2014-03-19 | 2014-03-19 | Electric melting magnesium-aluminum-chromium synthesis material and production method thereof |
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| CN103922763B CN103922763B (en) | 2015-04-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496502A (en) * | 2014-12-30 | 2015-04-08 | 北京利尔高温材料股份有限公司 | Alumina-spinel-carbon brick containing aluminachrome slag and preparation method of alumina-spinel-carbon brick |
| CN104844189A (en) * | 2015-03-31 | 2015-08-19 | 上海大学 | Preparation method for single phase chromium-containing magnesia-alumina spinel powder |
| CN107793166A (en) * | 2017-12-11 | 2018-03-13 | 辽宁科技大学 | Zn Rotary Kiln electric smelting is in conjunction with alumina magnesia-chrome fire brick and preparation method thereof |
| CN113173780A (en) * | 2021-04-26 | 2021-07-27 | 郑州大学 | Magnesia-bonded refractory castable containing in-situ spinel and preparation method thereof |
-
2014
- 2014-03-19 CN CN201410102081.6A patent/CN103922763B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 杨德安 等: "利用高碱铝铬渣合成镁铝铬尖晶石", 《硅酸盐通报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496502A (en) * | 2014-12-30 | 2015-04-08 | 北京利尔高温材料股份有限公司 | Alumina-spinel-carbon brick containing aluminachrome slag and preparation method of alumina-spinel-carbon brick |
| CN104496502B (en) * | 2014-12-30 | 2016-08-24 | 北京利尔高温材料股份有限公司 | A kind of aluminate carbon brick containing aluminum chromium slag and preparation method thereof |
| CN104844189A (en) * | 2015-03-31 | 2015-08-19 | 上海大学 | Preparation method for single phase chromium-containing magnesia-alumina spinel powder |
| CN107793166A (en) * | 2017-12-11 | 2018-03-13 | 辽宁科技大学 | Zn Rotary Kiln electric smelting is in conjunction with alumina magnesia-chrome fire brick and preparation method thereof |
| CN113173780A (en) * | 2021-04-26 | 2021-07-27 | 郑州大学 | Magnesia-bonded refractory castable containing in-situ spinel and preparation method thereof |
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| CN103922763B (en) | 2015-04-08 |
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