CN101891408A - Method for preparing magnesia-alumina spinel-containing aluminate cement - Google Patents
Method for preparing magnesia-alumina spinel-containing aluminate cement Download PDFInfo
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- CN101891408A CN101891408A CN 201010247366 CN201010247366A CN101891408A CN 101891408 A CN101891408 A CN 101891408A CN 201010247366 CN201010247366 CN 201010247366 CN 201010247366 A CN201010247366 A CN 201010247366A CN 101891408 A CN101891408 A CN 101891408A
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- aluminate cement
- magnesium
- aluminium spinel
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- light dolomite
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Abstract
The invention discloses a method for preparing magnesia-alumina spinel-containing aluminate cement, which comprises the following steps of: firstly, crushing raw materials; secondly, grinding the crushed materials; thirdly, mixing the ground materials in proportion and bunching the mixture; fourthly, ramming and molding the material bunch after the bunching is finished; sixthly, placing the molded material into a furnace for heating and sintering; and finally crushing and grinding again the sintered material after the material is cooled to the room temperature to obtain the magnesia-alumina spinel-containing aluminate cement. The novel magnesia-alumina spinel-containing aluminate cement prepared by the method of the invention has relatively higher fire resistance, and as a bonding agent of a ladle castable, remarkably improves the slag resistance of the ladle castable. The method has the advantages of simple process and high applicability, and can be widely applied to a plurality of industries, such as metallurgy, building materials and the like.
Description
Technical field
The invention belongs to technical field of inorganic nonmetallic materials, particularly a kind of preparation method who contains the aluminate cement of magnesium-aluminium spinel.
Technical background
Along with the development of unshape refractory, refractory castable constantly becomes its leading product.Refractory Carstables for Ladles is exactly wherein a kind of important refractory product.Many characteristics are arranged himself, and making more, multiple-project is achieved.And if the used wedding agent of Refractory Carstables for Ladles is different, its combination is just different with bonding mechanism, and the performance impact of refractory product is also had nothing in common with each other.The Refractory Carstables for Ladles that is representative with low cement deposit material has occupied critical role in market competition.The wedding agent of aluminate cement Chang Zuowei Refractory Carstables for Ladles, and can add synthetic magnesium-aluminium spinel (MgOAl in advance in the mould material
2O
3, hereinafter to be referred as MA) and to improve the heat-shock resistance and the resistance to fouling of Refractory Carstables for Ladles.This all is because MA has fusing point height (2135 ℃), normal temperature, hot strength height, characteristics such as thermal expansivity is low, and thermal conductivity is good.MA also has very high chemical stability except above advantage, not with concentrated acid reaction, opposing alkali ability to function is also higher than corundum, and most of salt and slag do not react with spinel, and be very stable to carbon, metal, metal melt yet.But the production cost of magnesium-aluminium spinel is higher, has limited its application.If aluminate cement (Refractory Carstables for Ladles wedding agent) itself just contains this kind thing phase, comparing conventional aluminum acid salt cement performance will improve a lot, and can reduce the cost of Refractory Carstables for Ladles again.
Summary of the invention
The purpose of this invention is to provide a kind of preparation method who contains the aluminate cement of magnesium-aluminium spinel, the aluminate cement of this method preparation is to form by original position blending theory sintering, has made the novel aluminum acid salt cement that contains magnesium-aluminium spinel.The novel aluminum acid salt cement that contains magnesium-aluminium spinel has higher fire performance, as the Refractory Carstables for Ladles of wedding agent, can reduce the content of system CaO, not only can improve the use temperature of mould material, the resistance to fouling of mould material can also be improved, the cost of mould material can be reduced simultaneously.
To achieve these goals, the present invention takes following technical solution:
A kind of preparation method who contains the aluminate cement of magnesium-aluminium spinel is characterized in that, comprises the following steps:
Step 1 is taken up in order of priority raw alumina and light dolomite at jaw crusher, carry out in the double roll crusher slightly broken, in broken, obtain the particulate material that a particle diameter is 3～5mm;
Step 2, according to aluminum oxide: the light dolomite weight percent is 60～70: 40～30 ratio, particulate material is put in the ball mill ground mixing altogether with spherical grinding element, obtains less than 180 order powder materials;
Step 3, the water that adds powder material quality 3～5% in will the powder material through grinding mixing altogether fully stirs, and carries out airtight bundle material again;
Step 4, the material that bundle material is finished are packed in the mould, to its ramming process; After the moulding, with its seasoning at room temperature;
Step 5, after drying, the demoulding is burnt till under 1550～1600 ℃ of temperature, and is incubated 4～6 hours;
Step 6, broken then sintered product is ground to below 200 orders, the final novel aluminum acid salt cement that obtains to contain magnesium-aluminium spinel.
Described raw alumina is a commercial alumina, its purity＞99.5%.
Described raw material light dolomite content consists of: SiO
20.49%; CaO 44.34%; MgO29.92%; Fe
2O
30.28%; Al
2O
30.14%; L.O.I content 25.09%.
Adopt the novel aluminum acid salt cement that contains magnesium-aluminium spinel of method of the present invention preparation, have higher fire performance, also be significantly improved as the Refractory Carstables for Ladles slag resistance of wedding agent.For a long time, people adopt usually scorification produce pure calcium aluminate cement and the spinel cost higher, difficulty is bigger.Develop this cement, production cost is reduced greatly with compound pure calcium aluminate of natural matter SINTERING PRODUCTION and spinel.Its preparation technology is simple, and suitability is strong, can be widely used in all conglomeraties such as metallurgy, building materials.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment
Referring to Fig. 1,, at first raw material is carried out fragmentation according to the preparation method who contains the aluminate cement of magnesium-aluminium spinel of the present invention; Again the material after the fragmentation is ground; Material after will grinding then mixes by proportioning and the bundle material; The bundle material finishes the back to its ramming process; Material after the moulding is put into the stove sintering that heats up; Wait to reduce to after the room temperature to its once more crushing grinding can obtain to contain the aluminate cement of magnesium-aluminium spinel.
Below be the embodiment that the contriver provides, the invention is not restricted to this embodiment, in the scope that the present invention provides, all can produce the good aluminate cement that contains spinel of sintering.
Embodiment 1:
Adopting light dolomite and commercial alumina (purity＞99.5%) is raw material.The chemical constitution of light dolomite (referring to table 1).
Step 1 is taken up in order of priority primary industry aluminum oxide and light dolomite at jaw crusher, carry out in the double roll crusher slightly broken, in broken, obtain the particulate material that a particle diameter is 3mm;
Step 2, according to aluminum oxide: the light dolomite weight percent is 60: 40 a ratio, particulate material is put in the ball mill ground mixing altogether with spherical grinding element, obtains less than 180 order powder materials;
Step 3, the water that adds powder material quality 3% in will the powder material through grinding mixing altogether fully stirs, and carries out airtight bundle material again;
Step 4, the material that bundle material is finished are packed in the mould, to its ramming process; After the moulding, with its seasoning at room temperature;
Step 5, after drying, the demoulding is burnt till under 1550 ℃ of temperature, and is incubated 4 hours;
Step 6 is treated will expect to take out after furnace temperature is reduced to room temperature then, and broken sintered product is ground to below 200 orders, the final novel aluminum acid salt cement that obtains to contain magnesium-aluminium spinel.
Embodiment 2:
Adopting light dolomite and commercial alumina (purity＞99.5%) is raw material.The chemical constitution of light dolomite (referring to table 1).
Step 1 is taken up in order of priority primary industry aluminum oxide and light dolomite at jaw crusher, carry out in the double roll crusher slightly broken, in broken, obtain the particulate material that a particle diameter is 5mm;
Step 2, according to aluminum oxide: the light dolomite weight percent is 70: 30 a ratio, particulate material is put in the ball mill ground mixing altogether with spherical grinding element, obtains less than 180 order powder materials;
Step 3, the water that adds powder material quality 5% in will the powder material through grinding mixing altogether fully stirs, and carries out airtight bundle material again;
Step 4, the material that bundle material is finished are packed in the mould, to its ramming process; After the moulding, with its seasoning at room temperature;
Step 5, after drying, the demoulding is burnt till under 1600 ℃ of temperature, and is incubated 5 hours;
Step 6 is treated will expect to take out after furnace temperature is reduced to room temperature then, and broken sintered product is ground to below 200 orders, the final novel aluminum acid salt cement that obtains to contain magnesium-aluminium spinel.
Embodiment 3:
Adopting light dolomite and commercial alumina (purity＞99.5%) is raw material.The chemical constitution of light dolomite (referring to table 1).
Step 1 is taken up in order of priority primary industry aluminum oxide and light dolomite at jaw crusher, carry out in the double roll crusher slightly broken, in broken, obtain the particulate material that a particle diameter is 4mm;
Step 2, according to aluminum oxide: the light dolomite weight percent is 65: 35 a ratio, particulate material is put in the ball mill ground mixing altogether with spherical grinding element, obtains less than 180 order powder materials;
Step 3, the water that adds powder material quality 4% in will the powder material through grinding mixing altogether fully stirs, and carries out airtight bundle material again;
Step 4, the material that bundle material is finished are packed in the mould, to its ramming process; After the moulding, with its seasoning at room temperature;
Step 5, after drying, the demoulding is burnt till under 1580 ℃ of temperature, and is incubated 6 hours;
Step 6 is treated will expect to take out after furnace temperature is reduced to room temperature then, and broken sintered product is ground to below 200 orders, the final novel aluminum acid salt cement that obtains to contain magnesium-aluminium spinel.
The present invention has introduced in-situ synthesized reaction, is exactly according to MgO-CaO-Al
2O
3The ternary phase diagrams batching is also generating high-quality MA thing phase in the middle of the reaction process except generating the needed pure calcium aluminate cement of mould material.Synthetic MA is through high-temperature calcination in advance, and chemically reactive is lower, absorbs Fe
2O
3, CaO ability relatively poor.And generated in-situ MA reacts generation in heat-processed, and chemically reactive is higher, absorbs Fe
2O
3, CaO ability also stronger.Compared with the traditional MA of synthetic in advance and the mechanically mixing of aluminate cement, this generated in-situ MA, particle is littler, and dispersive is more even.Every performance index of this kind cement are higher than traditional pure calcium aluminate cement far away.Therefore, develop this aluminate cement that contains spinel, have broad application prospects.
The present invention makes every effort to make that sintering process is oversimplified, minimizing costs, and finally realizes its practical application in metallurgical industry.
The chemical constitution w% of table 1 rhombspar
Claims (3)
1. a preparation method who contains the aluminate cement of magnesium-aluminium spinel is characterized in that, comprises the following steps:
Step 1 is taken up in order of priority raw alumina and light dolomite at jaw crusher, carry out in the double roll crusher slightly broken, in broken, obtain the particulate material that a particle diameter is 3～5mm;
Step 2, according to aluminum oxide: the light dolomite weight percent is the ratio of 60～70:40～30, particulate material is put in the ball mill ground mixing altogether with spherical grinding element, obtains less than 180 order powder materials;
Step 3, the water that adds powder material quality 3～5% in will the powder material through grinding mixing altogether fully stirs, and carries out airtight bundle material again;
Step 4, the material that bundle material is finished are packed in the mould, to its ramming process; After the moulding, with its seasoning at room temperature;
Step 5, after drying, the demoulding is burnt till under 1550～1600 ℃ of temperature, and is incubated 4～6 hours;
Step 6, broken then sintered product is ground to below 200 orders, the final novel aluminum acid salt cement that obtains to contain magnesium-aluminium spinel.
2. a kind of preparation method who contains the aluminate cement of magnesium-aluminium spinel as claimed in claim 1 is characterized in that described raw alumina is a commercial alumina, its purity＞99.5%.
3. a kind of preparation method who contains the aluminate cement of magnesium-aluminium spinel as claimed in claim 1 is characterized in that, described raw material light dolomite content consists of: SiO
20.49%; CaO 44.34%; MgO 29.92%; Fe
2O
30.28%; Al
2O
30.14%; L.O.I content 25.09%.
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|---|---|---|---|
| CN 201010247366 CN101891408B (en) | 2010-08-06 | 2010-08-06 | Method for preparing magnesia-alumina spinel-containing aluminate cement |
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|---|---|---|---|
| CN 201010247366 CN101891408B (en) | 2010-08-06 | 2010-08-06 | Method for preparing magnesia-alumina spinel-containing aluminate cement |
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| CN101891408A true CN101891408A (en) | 2010-11-24 |
| CN101891408B CN101891408B (en) | 2013-04-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073206A (en) * | 2013-02-26 | 2013-05-01 | 武汉科技大学 | Aluminate cement containing magnesium-aluminate spinel and preparation method thereof |
| CN104496229A (en) * | 2014-12-02 | 2015-04-08 | 佛山铭乾科技有限公司 | Novel aluminate cement material and preparation method thereof |
| CN104591565A (en) * | 2015-01-09 | 2015-05-06 | 武汉科技大学 | Aluminate cement containing nano magnesium aluminate spinel and preparation method thereof |
| CN112851160A (en) * | 2021-03-10 | 2021-05-28 | 项金生 | Production method of pure calcium aluminate cement |
| CN113772976A (en) * | 2021-09-29 | 2021-12-10 | 齐鲁工业大学 | Sulphoaluminate-magnesium aluminate spinel cementing material, preparation method, system and application |
-
2010
- 2010-08-06 CN CN 201010247366 patent/CN101891408B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 《硅酸盐通报》 20090228 石金辉 等 外加剂对含镁铝尖晶石新型铝酸盐水泥结合强度的影响 175-179 1-3 第28卷, 第1期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073206A (en) * | 2013-02-26 | 2013-05-01 | 武汉科技大学 | Aluminate cement containing magnesium-aluminate spinel and preparation method thereof |
| CN104496229A (en) * | 2014-12-02 | 2015-04-08 | 佛山铭乾科技有限公司 | Novel aluminate cement material and preparation method thereof |
| CN104591565A (en) * | 2015-01-09 | 2015-05-06 | 武汉科技大学 | Aluminate cement containing nano magnesium aluminate spinel and preparation method thereof |
| CN104591565B (en) * | 2015-01-09 | 2016-07-27 | 武汉科技大学 | A kind of aluminate cement containing nano magnalium spinelle and preparation method thereof |
| CN112851160A (en) * | 2021-03-10 | 2021-05-28 | 项金生 | Production method of pure calcium aluminate cement |
| CN113772976A (en) * | 2021-09-29 | 2021-12-10 | 齐鲁工业大学 | Sulphoaluminate-magnesium aluminate spinel cementing material, preparation method, system and application |
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| Publication number | Publication date |
|---|---|
| CN101891408B (en) | 2013-04-24 |
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