CN101837996A - Method for melting purification of magnesia by using waste magnesium product - Google Patents
Method for melting purification of magnesia by using waste magnesium product Download PDFInfo
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- CN101837996A CN101837996A CN201010181711A CN201010181711A CN101837996A CN 101837996 A CN101837996 A CN 101837996A CN 201010181711 A CN201010181711 A CN 201010181711A CN 201010181711 A CN201010181711 A CN 201010181711A CN 101837996 A CN101837996 A CN 101837996A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention relates to a method for the melting purification of magnesia by using a waste magnesium product. The adopted technical scheme is that the method comprises the following steps of: manually picking out and removing impurities visible to the naked eye from various purchased waste magnesium products; crushing and grinding the waste magnesium products subjected to the impurity removal into powder of below 800 meshes and removing iron with an iron removing device; removing carbon from the powder subjected to the iron removal by the water floatation method; loading the powder subjected to the carbon removal by the water floatation method into a kiln bogie, conveying the kiln bogie loaded with the powder to a tunnel kiln or a shuttle kiln, closing the kiln door, stirring the powder at the temperature of 550 to 650 DEG C and blowing in oxygen for 2 to 4 hours; uniformly mixing the powder subjected to the carbon removal with light burnt magnesium powder in a weight ratio of 1:2-4 and performing compression molding and drying; conveying the dried blank to a high-temperature electric arc furnace for melting at the temperature of 2,500 to 3,500 DEG C for 6 to 8 hours; and cooling, crushing and selecting the products. The method has the advantages of saving resource, protecting environment and saving energy.
Description
Technical field
The present invention relates to a kind of preparation method of magnesia, relate to a kind of method of utilizing the waste magnesium product melting purification of magnesia particularly.
Background technology
Basic refractory is the essential product of industries such as iron and steel, cement, the main raw material of basic refractory then is a magnesia, though that the magnesium ore resources of China contains is abundant, it is resource deposits after all, exploitation is a just few a, its use of therefore will making rational planning for.Yet with regard to present stage, the use of basic refractory all is disposable basically, waste and old magnesia carbon brick, magnesia bricks etc. have all been worked as refuse treatment basically, though also there is the recovery waste magnesia carbon brick present stage, but the waste magnesia carbon brick that reclaims all is to serve as waste material to use, and can't be used for producing high-grade magnesia product, causes the waste of Mineral resources.
China is industrial power, big steel country, and waste magnesia carbon brick far more than ten million, the recycle waste magnesia carbon brick be can't but go ahead, and magnesia is Mineral resources, and non-renewable, it is imperative to consider to make full use of waste magnesium product from the strategic angle of long term growth.
Summary of the invention
In order to address the above problem, the invention provides a kind of method that makes full use of waste and old magnesium goods melting purification of magnesia, not only economize on resources, and protected environment.
To achieve these goals, the technical solution used in the present invention is: a kind of method of utilizing the waste magnesium product melting purification of magnesia, and its step is as follows:
(1) raw material is selected: all kinds of waste magnesium products that will purchase are removed macroscopic impurity through hand picking;
Usually, the main waste magnesium product raw material of purchase is: expire product of used discarded magnesia carbon brick, magnesia brick or magnesia products production producer etc.
Magnesia carbon brick, magnesia brick process are used, and its surface is more residual impurity such as aluminium, iron and calcium that are different from brick obviously, therefore when raw material is selected, at first with the artificial removal of impurity of these impurity warps, to reduce the high-temperature fusion time, reduce production costs.
(2) broken deironing: the broken fine grinding of waste magnesium product that will remove behind the impurity becomes the following fine powder of 800 orders, by the equipment for removing ferric ion deironing;
(3) flotation de-carbon: the fine powder after the deironing by the water flotation process, is removed carbon elimination;
(4) warm de-carbon in: with the kiln car of packing into of the fine powder behind the flotation de-carbon, send in tunnel furnace or the shuttle kiln, close wicket, under 550～650 ℃, stir, and be blown into oxygen 2～4 hours;
(5) pressed compact moulding and drying: fine powder behind the de-carbon and light-burning magnesium powder are mixed pressed compact moulding, drying by weight 1: 2～4;
(6) fusion-crystallization: dried base substrate is sent in the high-temperature electric arc stove, under 2500～3500 ℃, fusion 6～8 hours;
(7) product cooling, fragmentation, selection.
Among the present invention, impurity in the waste magnesium product such as phosphoric acid salt, resins etc. can decompose and volatilize under high temperature fused state, the impurity of removing least easily is carbon, we adopt two step de-carbons for this reason, at first remove most carbon through the water flotation process, adopt the method for oxygen blast gas under the molten state to come further to remove carbon elimination then, be blown into oxygen in tunnel furnace or shuttle kiln continuously, with the further oxidation of the residual carbon in the fine powder, carbon content and moisture content are trace in the fine powder thereby make, this is one critical operation, the height of carbon-drop rate directly affects the fusion time in the high-temperature electric arc stove, and the present invention can be fully with carbon removal through the two-step approach de-carbon.
Through the magnesia of the present invention's preparation, its physical and chemical index sees Table 1.
Table 1
| Index | 97 electrosmelted magnesite clinkers | The magnesia of the inventive method preparation |
| ??SiO 2％ | ??1.13 | ??≤1.25 |
| ??Al 2O 3％ | ??0.10 | ??≤0.3 |
| ??Fe 2O 3％ | ??0.80 | ??≤1.0 |
| ??CaO％ | ??1.08 | ??≤1.2 |
| ??MgO％ | ??96.81 | ??≥96 |
| ??IL | ??0.08 | ??≤0.12 |
| ??B.D | ??3.48 | ??≤3.49 |
Compare purity low spot a little with the normal electrical fused magnesia through the magnesia of method preparation of the present invention as seen from Table 1, but do not influence the use of magnesia, because the inside alumina content is higher.This depends primarily on raw material, often contain the metallic aluminium additive in the waste magnesia carbon brick that reclaims, also have the part magnesium aluminum-carbon brick to be mixed in the raw material probably, so cause the aluminium content of product higher, aluminum oxide is produced magnesium-aluminium spinel with magnesium oxide under high temperature fused state, do not influence the quality of magnesia, the magnesia of this product mainly is used in following aspect: magnesia carbon brick, magnesia-alumina-carbon brick, magnesia brick, Refractory Carstables for Ladles, in the production of metallurgical refractory materialss such as tundish coating and electric furnace furnace bottom ramming mass, not only effective, and productive expense is low, resource circulation utilization tallies with the national condition.We are pressed into the ladle furnace lining brick with the magnesia of the inventive method preparation, in the experiment of stainless steel plant, Tangshan, after the experiment through three ladles, compare with the ladle furnace lining brick that the common electrical fused magnesia is made, and do not have obviously difference in the use.
Beneficial effect of the present invention: 1. economize on resources the protection environment.The present invention has made full use of all kinds of waste and old magnesium goods, as the expire product of depleted magnesia carbon brick, magnesia brick or magnesia products production producer etc., farthest recycle existing magnesia.2. save energy.At first remove most of macroscopic impurity, reduced the high-temperature fusion time through hand picking.Secondly, the height of carbon-drop rate directly affects the fusion time of electric arc furnace, and just the height of expense and economy link directly, and the present invention adopts two step decarburizations, but gross decarburization has reduced the fusion time.
Embodiment
1 one kinds of methods of utilizing depleted magnesia carbon brick melting purification of magnesia of embodiment
Step is as follows:
(1) raw material is selected: the depleted magnesia carbon brick of purchase is removed impurity such as macroscopic aluminium, iron and calcium through hand picking;
(2) broken deironing: the broken fine grinding of discarded magnesia carbon brick that will remove behind the impurity becomes the following fine powder of 800 orders, by the equipment for removing ferric ion deironing;
(3) flotation de-carbon: the fine powder after the deironing is placed tank,, remove carbon elimination by the water flotation process.Utilize carbon different with the proportion of magnesia, carbon is bubbled through the water column, and magnesia etc. are sunken to the bottom, and most of carbon is removed;
To the fine powder after the water flotation, adopting burning gravimetric determination total carbon (standard of execution is GB/T13245-91) to record carbon content is 5%.
(4) warm de-carbon in: with the kiln car (stock stirring device is housed on the kiln car) of packing into of the fine powder behind the flotation de-carbon, send in the tunnel furnace, close wicket, under 550～650 ℃, stir, and be blown into oxygen 3 hours;
(5) pressed compact moulding and drying: fine powder behind the de-carbon and light-burning magnesium powder (content of magnesia 97%) were mixed pressed compact moulding, drying by weight 1: 3;
(6) fusion-crystallization: dried base substrate is sent in the high-temperature electric arc stove, under 3000 ℃, fusion 7 hours;
(5) with product cooling, fragmentation, selection.
The results are shown in Table 2.Further the magnesia with preparation is pressed into the ladle furnace lining brick, in the experiment of stainless steel plant, Tangshan, after the experiment through three ladles, compares with the ladle furnace lining brick that the common electrical fused magnesia is made, and does not have obviously difference in the use.
2 one kinds of methods of utilizing depleted magnesia brick melting purification of magnesia of embodiment
Step is as follows:
(1) raw material is selected: the depleted magnesia brick of purchase is removed impurity such as macroscopic aluminium, iron and calcium through hand picking;
(2) broken deironing: the broken fine grinding of discarded magnesia brick that will remove behind the impurity becomes the following fine powder of 800 orders, by the equipment for removing ferric ion deironing;
(3) flotation de-carbon: the fine powder after the deironing is placed tank,, remove carbon elimination by the water flotation process.
To the fine powder after the flotation, adopting burning gravimetric determination total carbon (standard of execution is GB/T13245-91) to record carbon content is 5%.
(4) warm de-carbon in: with the kiln car (stock stirring device is housed on the kiln car) of packing into of the fine powder behind the flotation de-carbon, send in the shuttle kiln, close wicket, under 550～650 ℃, stir, and be blown into oxygen 4 hours;
(5) pressed compact moulding and drying: fine powder behind the de-carbon and light-burning magnesium powder (content of magnesia 97.5%) were mixed pressed compact moulding, drying by weight 1: 4;
(6) fusion-crystallization: dried base substrate is sent in the high-temperature electric arc stove, under 3000 ℃, fusion 7 hours;
(5) with product cooling, fragmentation, selection.
The results are shown in Table 2.Further the magnesia with preparation is pressed into the ladle furnace lining brick, in the experiment of stainless steel plant, Tangshan, after the experiment through three ladles, compares with the ladle furnace lining brick that the common electrical fused magnesia is made, and does not have obviously difference in the use.
3 one kinds of methods of utilizing the magnesia product melting purification of magnesia of depleted of embodiment
Step is as follows:
(1) raw material is selected: the magnesia product of the magnesia products production of depleted producer's expire of purchase is removed macroscopic impurity through hand picking;
(2) broken deironing: the broken fine grinding of discarded magnesia product that will remove behind the impurity becomes the following fine powder of 800 orders, by the equipment for removing ferric ion deironing;
(3) flotation de-carbon: the fine powder after the deironing is placed tank,, remove carbon elimination by the water flotation process.
To the fine powder after the flotation, adopting burning gravimetric determination total carbon (standard of execution is GB/T13245-91) to record carbon content is 5%.
(4) warm de-carbon in: with the kiln car (stock stirring device is housed on the kiln car) of packing into of the fine powder behind the flotation de-carbon, send in the shuttle kiln, close wicket, under 550～650 ℃, stir, and be blown into oxygen 2 hours;
(5) pressed compact moulding and drying: fine powder behind the de-carbon and light-burning magnesium powder (content of magnesia 97.8%) were mixed pressed compact moulding, drying by weight 1: 2;
(6) fusion-crystallization: dried base substrate is sent in the high-temperature electric arc stove, under 3000 ℃, fusion 7 hours;
(5) with product cooling, fragmentation, selection.
The results are shown in Table 2.Further the magnesia with preparation is pressed into the ladle furnace lining brick, in the experiment of stainless steel plant, Tangshan, after the experiment through three ladles, compares with the ladle furnace lining brick that the common electrical fused magnesia is made, and does not have obviously difference in the use.
Table 2
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| ??SiO 2％ | ??1.2 | ??1.20 | ??1.25 |
| ??Al 2O 3％ | ??0.21 | ??0.30 | ??0.30 |
| ??Fe 2O 3％ | ??0.98 | ??1.00 | ??0.95 |
| ??CaO％ | ??0.96 | ??1.10 | ??1.05 |
| ??MgO％ | ??96.12 | ??96.20 | ??96.20 |
| ??IL | ??0.07 | ??0.12 | ??0.10 |
| ??B.D | ??3.45 | ??3.47 | ??3.48 |
Claims (1)
1. method of utilizing the waste magnesium product melting purification of magnesia is characterized in that step is as follows:
(1) raw material is selected: all kinds of waste magnesium products that will purchase are removed macroscopic impurity through hand picking;
(2) broken deironing: the broken fine grinding of waste magnesium product that will remove behind the impurity becomes the following fine powder of 800 orders, by the equipment for removing ferric ion deironing;
(3) flotation de-carbon: the fine powder after the deironing by the water flotation process, is removed carbon elimination;
(4) warm de-carbon in: with the kiln car of packing into of the fine powder behind the flotation de-carbon, send in tunnel furnace or the shuttle kiln, close wicket, under 550～650 ℃, stir, and be blown into oxygen 2～4 hours;
(5) pressed compact moulding and drying: fine powder behind the de-carbon and light-burning magnesium powder are mixed pressed compact moulding, drying by weight 1: 2～4;
(6) fusion-crystallization: dried base substrate is sent in the high-temperature electric arc stove, under 2500～3500 ℃, fusion 6～8 hours;
(7) product cooling, fragmentation, selection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101817115A CN101837996B (en) | 2010-05-25 | 2010-05-25 | Method for melting purification of magnesia by using waste magnesium product |
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| CN2010101817115A CN101837996B (en) | 2010-05-25 | 2010-05-25 | Method for melting purification of magnesia by using waste magnesium product |
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| CN101837996A true CN101837996A (en) | 2010-09-22 |
| CN101837996B CN101837996B (en) | 2011-09-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819179A (en) * | 2013-12-31 | 2014-05-28 | 四川宝龙建材有限责任公司 | Method for extracting magnesia from magnesia carbon brick remnants |
| CN104550187A (en) * | 2013-10-12 | 2015-04-29 | 中冶宝钢技术服务有限公司 | Process method for recycling used refractory materials |
| CN106179769A (en) * | 2016-09-19 | 2016-12-07 | 中南大学 | The method of metallic copper in copper metallurgy waste refractory materials is reclaimed in a kind of flotation |
| CN114163218A (en) * | 2021-12-08 | 2022-03-11 | 攀枝花钢城集团有限公司 | Method for recycling waste magnesia carbon bricks |
| CN115819073A (en) * | 2022-11-30 | 2023-03-21 | 浙江琰大新材料有限公司 | Magnesium thermal-state gunning mix for refining ladle slag line and preparation process thereof |
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| DD232904A1 (en) * | 1984-12-27 | 1986-02-12 | Kali Veb K | METHOD FOR PRODUCING HIGH-PURITY SINTERMAGNESIA HIGH DENSITY |
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| CN101480564A (en) * | 2008-01-07 | 2009-07-15 | 宝山钢铁股份有限公司 | Use of magnesium used refractory materials and method for preparing desulfurizing agent thereof |
| CN101565280A (en) * | 2009-06-16 | 2009-10-28 | 海城华宇耐火材料有限公司 | Manufacturing method for burning light burning magnesite powder by tunnel kiln |
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2010
- 2010-05-25 CN CN2010101817115A patent/CN101837996B/en not_active Expired - Fee Related
Patent Citations (4)
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| DD232904A1 (en) * | 1984-12-27 | 1986-02-12 | Kali Veb K | METHOD FOR PRODUCING HIGH-PURITY SINTERMAGNESIA HIGH DENSITY |
| CN1150131A (en) * | 1996-09-05 | 1997-05-21 | 辽宁镁矿耐火材料公司 | Method for producing high-purity dense macrocrystalline sintered magnesia |
| CN101480564A (en) * | 2008-01-07 | 2009-07-15 | 宝山钢铁股份有限公司 | Use of magnesium used refractory materials and method for preparing desulfurizing agent thereof |
| CN101565280A (en) * | 2009-06-16 | 2009-10-28 | 海城华宇耐火材料有限公司 | Manufacturing method for burning light burning magnesite powder by tunnel kiln |
Non-Patent Citations (1)
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| 《耐火材料》 20050822 田守信等 用后镁碳砖的再生研究 第39卷, 第04期 2 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550187A (en) * | 2013-10-12 | 2015-04-29 | 中冶宝钢技术服务有限公司 | Process method for recycling used refractory materials |
| CN104550187B (en) * | 2013-10-12 | 2016-05-25 | 中冶宝钢技术服务有限公司 | By rear resistance to material recycling treatment process method |
| CN103819179A (en) * | 2013-12-31 | 2014-05-28 | 四川宝龙建材有限责任公司 | Method for extracting magnesia from magnesia carbon brick remnants |
| CN106179769A (en) * | 2016-09-19 | 2016-12-07 | 中南大学 | The method of metallic copper in copper metallurgy waste refractory materials is reclaimed in a kind of flotation |
| CN114163218A (en) * | 2021-12-08 | 2022-03-11 | 攀枝花钢城集团有限公司 | Method for recycling waste magnesia carbon bricks |
| CN115819073A (en) * | 2022-11-30 | 2023-03-21 | 浙江琰大新材料有限公司 | Magnesium thermal-state gunning mix for refining ladle slag line and preparation process thereof |
| CN115819073B (en) * | 2022-11-30 | 2023-12-12 | 浙江琰大新材料有限公司 | Magnesia thermal state gunning material for refining ladle slag line and preparation process thereof |
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| CN101837996B (en) | 2011-09-21 |
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