CN100462327C - Method for preparing electro-fused magnesia alumina spinel - Google Patents
Method for preparing electro-fused magnesia alumina spinel Download PDFInfo
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- CN100462327C CN100462327C CNB2006100189517A CN200610018951A CN100462327C CN 100462327 C CN100462327 C CN 100462327C CN B2006100189517 A CNB2006100189517 A CN B2006100189517A CN 200610018951 A CN200610018951 A CN 200610018951A CN 100462327 C CN100462327 C CN 100462327C
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Abstract
This invention relates to a method for producing electro-melting magnesium aluminate spinel by applying used Mg-Al carbon bricks. The procedures comprise: mix 45-100wt% used Mg-Al carbon bricks with 0-55wt% bauxite powder and put the mixture in the electric arc furnace for electric melting at 1800-3000Deg C, after cooling pull it out for disintegrating and separating. The main chemical composition of the used Mg-Al carbon bricks at weight ratio is: Al2O3 50-75%, MgO 5-30%, and C 2-20%.This invention applies the C in the used Mg-Al carbon bricks as reducing agent and steel in the used Mg-Al carbon bricks as clarifying agent to remove the impurity oxidate substances like SiO2, Fe2O3 and TiO2 during the melting process, so as to obtain the electro-melting magnesium aluminate spinel. This invention can turn waste to be useful and decrease environmental pollution.
Description
One, technical field
The invention belongs to the technical field of preparation electric melting magnesium aluminum spinel refractory materials.Relate in particular to a kind of utilize with after aluminium-magnesia carbon brick prepare the method for electric melting magnesium aluminum spinel.
Two, background technology
Steel and iron industry is to consume the maximum industry of refractory material.Account for more than 70% of refractory materials.Recently China's steel and iron industry develops rapidly, estimates can reach 400,000,000 tons in 2006.With 40 kilograms of calculating of loss per ton steel refractory material, the annual refractory material that consumes is really only accounted for about 35% of total amount by the refractory material of slag corrode about 1,600 ten thousand tons.Be to have approximately every year 1000 ten thousand tons of refractory materials to go out of use, not only cause the waste of resource, and contaminated environment, the arable land occupied.Because refractory material is the ceramic material through the high temperature furnace calcining, being difficult to weathering at occurring in nature is earth, therefore bigger to the nature damage.
In a large amount of steel and iron industry discarded objects, the regeneration of refractory material research is carried out minimumly, and its reason is because capabilities of refractory materials is stable, and active low, composition and character and slag differ bigger, often be treated as impurity and dispose in steel slag utilization.Proper way is that it is made into refractory materials or other metallurgical auxiliary again.
Waste refractory materials mainly comprise with after the MgO-C fire resistant materials, with after continuous-casting three-main-product (slide plate, the mouth of a river and stopper), with after aluminium-magnesia carbon brick, with after the rear ASC material of the usefulness of blast furnace iron outlet groove and the ASC brick, with after pouring materialfor steel ladle, with after magnesite-chrome brick, with after high-alumina brick and clay brick etc., the utilization rate of the refractory material after China uses is also very low, even it also is rudimentary utilizing part, generally be simply to be incorporated in the refractory material, reduced the quality of refractory material.
Aluminium-magnesia carbon brick mainly is for ladle liner, and its chemical composition is mainly Al
2O
3, MgO, C and SiO
2With rear discarded aluminium-magnesia carbon brick only domestic certain iron company just have nearly 10,000 ton/years.Mixing in the aluminium-magnesia carbon brick after the rear aluminium-magnesia carbon brick fragmentation of a small amount of usefulness, pile up like a mountain for the rear aluminium-magnesia carbon brick of a large amount of usefulness, both wasted resource, polluted again environment.
Three, summary of the invention
The purpose of this invention is to provide a kind of can environmental contamination reduction, utilize with after aluminium-magnesia carbon brick prepare the method for electric melting magnesium aluminum spinel refractory material.
For achieving the above object, the technical solution used in the present invention is: mix and be placed on electric arc furnace with the Al2O3MgOC Bricks and 0～55% the calcined bauxite in powder of weight percentage after with 45～100% usefulness, smelt 1800～3000 ℃ of condition electric smelting, cool off back taking-up, fragmentation, separate.
With after the weight percentage of main chemical composition of aluminium-magnesia carbon brick be Al
2O
3Be 50～75%, MgO is 5～30%, C is 2～20%.
Because adopt technique scheme, the present invention has following characteristics:
(1) main raw material of the present invention is the waste of Iron And Steel Industry with refractory materials, is the magnesia-alumina-carbon brick after using, and can turn waste into wealth, and reduces environmental pollution.
(2) the present invention mainly the folder steel of the C in the magnesia-alumina-carbon brick after the usefulness in reducing agent, the magnesia-alumina-carbon brick after the usefulness as fining agent, to remove the SiO in the fusion process
2, Fe
2O
3, TiO
2Deng oxide impurity, thereby obtain electric melting magnesium aluminum spinel.
Four. embodiment
Embodiment 1
A kind of method for preparing electric melting magnesium aluminum spinel.This preparation method's raw material is the aluminium-magnesia carbon brick after using, and its chemical composition is: Al
2O
3Be 68.12%, MgO is 13.96%, C is 8.12%.Magnalium carbon after this usefulness is placed electric arc furnaces, and electric smelting is smelted under 2000～2600 ℃ of conditions, cools off rear taking-up, fragmentation, separates, obtains electric melting magnesium aluminum spinel.
Through the X-ray diffraction analysis, main phase is magnesium aluminate spinel and corundum, and a small amount of SiC phase is arranged, and the analysis result of chemical composition is: Al
2O
3Be 83.46%, MgO is 14.22%, volume density is 3.35g/cm
3, apparent porosity is 4.0%.
Embodiment 2
A kind of method for preparing electric melting magnesium aluminum spinel.This preparation method's raw material is the aluminium-magnesia carbon brick after using, and its chemical composition is: Al
2O
3Be 58.81%, MgO is 22.46%, C is 9.26%.Should place electric arc furnaces with rear magnalium carbon, electric smelting is smelted under 2000～2600 ℃ of conditions, cools off rear taking-up, fragmentation, separates, obtains electric melting magnesium aluminum spinel.
Through the X-ray diffraction analysis, main phase is magnesium aluminate spinel and corundum, and a small amount of SiC phase is arranged, and the analysis result of chemical composition is: Al
2O
3Be 73.62%, MgO is 23.61%, volume density is 3.25g/cm
3, apparent porosity is 4.5%.
Embodiment 3
A kind of method for preparing electric melting magnesium aluminum spinel.This preparation method's raw material is mainly the aluminium-magnesia carbon brick after using, and its chemical composition is: Al
2O
3Be 68.12%, MgO is 13.96%, C is 8.12%.Al2O3MgOC Bricks and 35～45% the calcined bauxite in powder of percentage composition after with 55～65% usefulness mixes and is placed on electric arc furnace by weight, smelts 1800～2400 ℃ of condition electric smelting, the cooling back takes out, broken, separate, obtain electric melting magnesium aluminum spinel.。
Through the X-ray diffraction analysis, main phase is corundum and magnesium aluminate spinel, chemical composition analysis: Al
2O
3Be that 91.32%, MgO is 7.85%, volume density is 3.46g/cm
3, apparent porosity is 4%.
Claims (1)
1. method for preparing electric melting magnesium aluminum spinel, it is characterized in that Al2O3MgOC Bricks after percentage composition is with 45～100% usefulness by weight and 0～55% calcined bauxite in powder mix is placed on electric arc furnace, smelt 1800～3000 ℃ of condition electric smelting, cool off back taking-up, fragmentation, separate;
With after the weight percentage of main chemical composition of aluminium-magnesia carbon brick be Al
2O
3Be 50～75%, MgO is 5～30%, C is 2～20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100189517A CN100462327C (en) | 2006-04-27 | 2006-04-27 | Method for preparing electro-fused magnesia alumina spinel |
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|---|---|---|---|
| CNB2006100189517A CN100462327C (en) | 2006-04-27 | 2006-04-27 | Method for preparing electro-fused magnesia alumina spinel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1865189A CN1865189A (en) | 2006-11-22 |
| CN100462327C true CN100462327C (en) | 2009-02-18 |
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| CNB2006100189517A Expired - Fee Related CN100462327C (en) | 2006-04-27 | 2006-04-27 | Method for preparing electro-fused magnesia alumina spinel |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102617172B (en) * | 2012-04-09 | 2013-09-18 | 武汉科技大学 | Electric smelting magenisum aluminum spinel brick for coal water slurry gasifying furnace and preparation method thereof |
| CN110436956A (en) * | 2019-07-31 | 2019-11-12 | 辽宁科技大学 | Discarded magnesia-alumina-carbon brick prepares periclase-magnesium aluminate spinel heat-barrier material method |
| CN113200756B (en) * | 2021-04-25 | 2022-07-15 | 北京金隅通达耐火技术有限公司 | Method for preparing regeneration raw material from used cement kiln alkaline bricks |
| CN113248268B (en) * | 2021-04-25 | 2022-07-15 | 北京金隅通达耐火技术有限公司 | Recycling method of used cement kiln bricks |
| CN114180953A (en) * | 2021-12-01 | 2022-03-15 | 攀枝花钢城集团有限公司 | Method for synthesizing magnesia-alumina spinel from waste magnesium and aluminum-carbon bricks and magnesia-alumina spinel |
| CN114315382B (en) * | 2021-12-17 | 2023-05-02 | 北京金隅通达耐火技术有限公司 | Magnesia-alumina spinel prepared by electric melting of hydrated magnesia-alumina bricks 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 |
| CN114180954B (en) * | 2022-02-15 | 2022-05-17 | 北京利尔高温材料股份有限公司 | Environment-friendly low-carbon aluminum-magnesium spinel brick and preparation method thereof |
| CN114477963A (en) * | 2022-03-16 | 2022-05-13 | 武汉钢铁集团耐火材料有限责任公司 | Ladle tank edge brick and preparation method thereof |
Citations (1)
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|---|---|---|---|---|
| CN1546419A (en) * | 2003-12-01 | 2004-11-17 | 陈忠贵 | Directly combined magnesia alumina spinel carbon brick and its preparing process |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1546419A (en) * | 2003-12-01 | 2004-11-17 | 陈忠贵 | Directly combined magnesia alumina spinel carbon brick and its preparing process |
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| CN1865189A (en) | 2006-11-22 |
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