CN115959889A - Method for recycling waste refractory materials to prepare magnesia carbon bricks - Google Patents
Method for recycling waste refractory materials to prepare magnesia carbon bricks Download PDFInfo
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- CN115959889A CN115959889A CN202211588106.9A CN202211588106A CN115959889A CN 115959889 A CN115959889 A CN 115959889A CN 202211588106 A CN202211588106 A CN 202211588106A CN 115959889 A CN115959889 A CN 115959889A
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention relates to the technical field of refractory materials, in particular to a method for preparing magnesia carbon bricks by recycling waste refractory materials. The process flow comprises the steps of classifying and screening the waste refractory materials, mixing the materials according to a specified ratio by taking the total mass of the reclaimed materials as a reference, crushing, removing iron by using chalcanthite, heating, drying, heating, mixing, firing under high pressure for forming, standing, cooling and then regenerating the magnesia carbon brick. The method utilizes the waste refractory material to generate the regenerated magnesia carbon brick, has simple process, can reduce the waste of the waste refractory material, and is beneficial to the regeneration and utilization of the waste material and the improvement of the added value; the regenerated magnesia carbon brick produced by using the waste refractory material as the raw material has good thermal shock resistance and pressure resistance, and has considerable economic benefit.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a method for recycling a waste refractory material to prepare a magnesia carbon brick.
Background
In recent years, mineral resources are controlled and limited by national environmental protection policies, refractory materials are increasingly tense, and prices are continuously rising. From the perspective of refractory resources, the reserves of refractory in China are reduced.
In the prior art, the treatment of waste refractory materials is mainly landfill, which not only occupies land, but also easily causes the damage of soil quality due to weathered and drenched waste refractory materials. With the promotion of the strategy of circular economy and sustainable development in China, the research and development recycling strength of the used waste refractory materials is gradually increased, so that resources are seriously wasted.
Therefore, the repeated use of refractory resources to maximize the effects of limited resources and achieve sustainability is a need for social development.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for producing magnesia carbon bricks by using waste refractory materials, which saves resources, improves environmental protection. The cost of the refractory material can be reduced, mineral resources are saved, and environmental waste is reduced.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for preparing magnesia carbon bricks by recycling waste refractory materials comprises the following steps:
1) Sorting the waste refractory material, mixing the materials according to the following component content proportion by taking the total weight of the reclaimed material as the reference, 80-95 percent 2 O 3 0.6-4.3% of SiO 2 1.8% -3.4% of MgO, 0.5% -1.8% of B 2 O 3 And the balance of impurities to obtain a regenerated material;
2) Crushing the regenerated material to obtain regenerated granules, and carrying out chalcanthite deironing on the regenerated granules;
3) Heating and drying the regenerated particle material after the iron is removed from the chalcanthite;
4) Firstly weighing the following materials in parts by weight: 30-40 parts of the regenerated granular material obtained in the step 2), 25-45 parts of high-purity magnesia, 15-20 parts of phenolic resin, 3-5 parts of tar, 8-10 parts of alumina, 5-10 parts of bentonite and 4-6 parts of asphalt, and then carrying out feeding and mixing in the order of feeding; adding the regenerated particles, adding the modified phenolic resin, finally adding the bentonite and the asphalt, and mixing for 30-40min at the temperature of 70-85 ℃.
5) And (3) high-pressure forming is carried out on the mixture obtained in the step 4), sintering is carried out in a high-temperature tunnel kiln at 1100-1400 ℃, heat preservation is carried out for 7-9h, and cooling is carried out to obtain the regenerated magnesia carbon brick.
The heating and drying conditions in the step 4) are that the heating rate is 5-15 ℃/min, and the temperature is kept for 6-8h after the temperature is raised to 400 ℃.
The modified phenolic resin is an organic solvent and phenolic resin, and the mass ratio of the organic solvent to the phenolic resin is 1.
The pressure range of the high-pressure forming in the step 5) is 100-270MPa.
The invention has the beneficial effects that: the recycling of the waste refractory materials is realized, the production cost of enterprises is reduced, and the corrosion and pollution of the waste refractory materials to the land are reduced. The process is simple, the waste of the waste refractory materials can be reduced, and the resource utilization of the waste refractory materials is beneficial to the recycling of waste materials and the improvement of added value; the regenerated magnesia carbon brick produced by using the waste refractory material as the raw material has good thermal shock resistance and pressure resistance, and has considerable economic benefit.
Detailed Description
The first embodiment is as follows:
a method for preparing magnesia carbon bricks by recycling waste refractory materials comprises the following steps:
1) Selecting waste refractory material, mixing with the regenerated material at a ratio of 80-95% 2 O 3 0.6-4.3% of SiO 2 1.8% -3.4% of MgO, 0.5% -1.8% of B 2 O 3 And the balance of impurities to obtain a regenerated material;
2) Crushing the regenerated material to obtain regenerated granules, and carrying out chalcanthite deironing on the regenerated granules;
3) Heating and drying the regenerated particle material after the iron is removed from the chalcanthite;
4) Firstly weighing the following materials in parts by weight: 40 parts of the regenerated particle material obtained in the step 2), 30 parts of high-purity magnesia, 20 parts of phenolic resin, 5 parts of tar, 10 parts of alumina, 10 parts of bentonite and 5 parts of asphalt, and then carrying out feeding and mixing in the order of feeding; adding the regenerated particles, adding the modified phenolic resin, finally adding the bentonite and the asphalt, and mixing for 30-40min at 70-85 ℃.
5) And (3) high-pressure forming is carried out on the mixture obtained in the step 4), sintering is carried out in a high-temperature tunnel kiln at 1100-1400 ℃, heat preservation is carried out for 7-9h, and cooling is carried out to obtain the regenerated magnesia carbon brick.
The heating and drying conditions in the step 4) are that the heating rate is 5-15 ℃/min, and the temperature is kept for 6-8h after the temperature is raised to 400 ℃.
The modified phenolic resin is an organic solvent and phenolic resin, and the mass ratio of the organic solvent to the phenolic resin is 1.
The pressure range of the high-pressure forming in the step 5) is 100-270MPa.
The second embodiment:
a method for preparing magnesia carbon bricks by recycling waste refractory materials comprises the following steps:
1) Selecting waste refractory material, mixing with the regenerated material at a ratio of 80-95% 2 O 3 0.6-4.3% of SiO 2 1.8% -3.4% of MgO, 0.5% -1.8% of B 2 O 3 And the balance of impurities to obtain a regenerated material;
2) Crushing the regenerated material to obtain regenerated granules, and carrying out chalcanthite deironing on the regenerated granules;
3) Heating and drying the regenerated particle material after the iron is removed from the chalcanthite;
4) Firstly, weighing the following materials in parts by weight: 35 parts of the regenerated granular material obtained in the step 2), 28 parts of high-purity magnesia, 15 parts of phenolic resin, 5 parts of tar, 10 parts of alumina, 8 parts of bentonite and 5 parts of asphalt, and then carrying out feeding and mixing in the following sequence; adding the regenerated particles, adding the modified phenolic resin, finally adding the bentonite and the asphalt, and mixing for 30-40min at the temperature of 70-85 ℃.
5) And (3) high-pressure forming is carried out on the mixture obtained in the step 4), sintering is carried out in a high-temperature tunnel kiln at 1100-1400 ℃, heat preservation is carried out for 7-9h, and cooling is carried out to obtain the regenerated magnesia carbon brick.
The heating and drying conditions in the step 4) are that the heating rate is 5-15 ℃/min, and the temperature is kept for 6-8h after the temperature is raised to 400 ℃.
The modified phenolic resin is an organic solvent and phenolic resin, and the mass ratio of the organic solvent to the phenolic resin is 1.
The pressure range of the high-pressure forming in the step 5) is 100-270MPa.
The third embodiment;
a method for preparing magnesia carbon bricks by recycling waste refractory materials comprises the following steps:
1) Sorting the waste refractory material, mixing the materials according to the following component content proportion by taking the total weight of the reclaimed material as the reference, 80-95 percent 2 O 3 0.6-4.3% of SiO 2 1.8% -3.4% of MgO, 0.5% -1.8% of B 2 O 3 And the balance of impurities to obtain a reclaimed material;
2) Crushing the regenerated material to obtain regenerated granules, and carrying out chalcanthite deironing on the regenerated granules;
3) Heating and drying the regenerated particle material after the iron is removed from the chalcanthite;
4) Firstly, weighing the following materials in parts by weight: 40 parts of the regenerated granular material obtained in the step 2), 30 parts of high-purity magnesia, 12 parts of phenolic resin, 6 parts of tar, 11 parts of alumina, 12 parts of bentonite and 5 parts of asphalt, and then carrying out feeding and mixing in the following sequence; adding the regenerated particles, adding the modified phenolic resin, finally adding the bentonite and the asphalt, and mixing for 30-40min at the temperature of 70-85 ℃.
5) And (5) performing high-pressure molding on the mixture obtained in the step 4), sintering in a high-temperature tunnel kiln at 1100-1400 ℃, preserving heat for 7-9h, and cooling to obtain the regenerated magnesia carbon brick.
The heating and drying conditions in the step 4) are that the heating rate is 5-15 ℃/min, and the temperature is kept for 6-8h after the temperature is raised to 400 ℃.
The modified phenolic resin is an organic solvent and phenolic resin, and the mass ratio of the organic solvent to the phenolic resin is 1.
The pressure range of the high-pressure forming in the step 5) is 100-270MPa.
Comparative example 1
As a comparative example, a commercially available magnesia carbon brick was used.
The performance tests of the recycled magnesia carbon bricks of examples 1-3 and comparative examples were carried out by preparing 3 samples for each example, drying at 200 ℃ to constant weight, evacuating, and testing the bulk density and porosity, wherein 3 samples for each example, drying at 200 ℃ to constant weight, and testing the room temperature compressive strength. The results of the physical and chemical index measurements are shown in Table 1:
TABLE 1 results of physical and chemical indexes
| Examples | Bulk Density (g/cm) 3 ) | Apparent porosity (%) | Thermal shock stability (1000 ℃ C., times) | Normal temperature compressive strength (Mpa) |
| Example 1 | 1.98 | 4.2 | 30 | 42 |
| Example 2 | 1.95 | 3.1 | 29 | 50 |
| Example 3 | 1.75 | 3.4 | 28 | 51 |
| Comparative example | 1.55 | 3.2 | 27 | 52 |
According to index comparative analysis of the recycled magnesia carbon bricks detected in the embodiments 1 to 3 and the comparative example, the recycled magnesia carbon bricks prepared by the method for recycling the waste refractory material have excellent physicochemical indexes, reach the index level of normal magnesia carbon bricks, can be applied to working layers of dry vibrating materials, coating materials and heat insulation plates, and achieve the purpose of turning waste into wealth.
Claims (4)
1. A method for preparing magnesia carbon bricks by recycling waste refractory materials is characterized by comprising the following steps:
1) Sorting the waste refractory material, mixing the materials according to the following component content proportion by taking the total weight of the reclaimed material as the reference, 80-95 percent 2 O 3 0.6-4.3% of SiO 2 1.8-3.4% of MgO, 0.5-1.8% of B 2 O 3 And the balance of impurities to obtain a reclaimed material;
2) Crushing the regenerated material to obtain regenerated granules, and carrying out chalcanthite deironing on the regenerated granules;
3) Heating and drying the regenerated particle material after the iron is removed from the chalcanthite;
4) Firstly, weighing the following materials in parts by weight: 30-40 parts of the regenerated granular material obtained in the step 2), 25-45 parts of high-purity magnesia, 15-20 parts of phenolic resin, 3-5 parts of tar, 8-10 parts of alumina, 5-10 parts of bentonite and 4-6 parts of asphalt, and then carrying out feeding and mixing in the order of feeding; adding the regenerated particles, adding the modified phenolic resin, finally adding the bentonite and the asphalt, and mixing for 30-40min at the temperature of 70-85 ℃.
5) And (3) high-pressure forming is carried out on the mixture obtained in the step 4), sintering is carried out in a high-temperature tunnel kiln at 1100-1400 ℃, heat preservation is carried out for 7-9h, and cooling is carried out to obtain the regenerated magnesia carbon brick.
2. The method for preparing the magnesia carbon brick by recycling the waste refractory material according to claim 1, wherein the method comprises the following steps: the heating and drying conditions in the step 4) are that the heating rate is 5-15 ℃/min, and the temperature is kept for 6-8h after the temperature is raised to 400 ℃.
3. The method for recycling the waste refractory materials to prepare the magnesia carbon bricks according to claim 1, wherein the modified phenolic resin is an organic solvent and phenolic resin, and the mass ratio of the organic solvent to the phenolic resin is 1.
4. The method for preparing magnesia carbon bricks by recycling waste refractory materials as recited in claim 1, wherein the pressure range of the high-pressure forming in the step 5) is 100-270Mpa.
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| CN202211588106.9A CN115959889A (en) | 2022-12-12 | 2022-12-12 | Method for recycling waste refractory materials to prepare magnesia carbon bricks |
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| CN202211588106.9A CN115959889A (en) | 2022-12-12 | 2022-12-12 | Method for recycling waste refractory materials to prepare magnesia carbon bricks |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013001606A (en) * | 2011-06-17 | 2013-01-07 | Jfe Steel Corp | Method for recycling used magnesia carbon brick and method for manufacturing magnesia carbon brick |
| CN108002818A (en) * | 2017-11-30 | 2018-05-08 | 长兴科创科技咨询有限公司 | The method of the recycling of waste and old refractory material |
| CN110511047A (en) * | 2019-09-30 | 2019-11-29 | 瑞泰马钢新材料科技有限公司 | A method of regenerative magnesia-carbon brick is prepared using aquation impregnation technique |
| CN111099899A (en) * | 2019-12-31 | 2020-05-05 | 巩义市大润昌耐火材料有限公司 | Treatment process of waste magnesia carbon brick regenerated particles |
| CN112279555A (en) * | 2020-10-15 | 2021-01-29 | 天津炜润达新材料科技有限公司 | Method for recycling waste refractory materials |
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2022
- 2022-12-12 CN CN202211588106.9A patent/CN115959889A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013001606A (en) * | 2011-06-17 | 2013-01-07 | Jfe Steel Corp | Method for recycling used magnesia carbon brick and method for manufacturing magnesia carbon brick |
| CN108002818A (en) * | 2017-11-30 | 2018-05-08 | 长兴科创科技咨询有限公司 | The method of the recycling of waste and old refractory material |
| CN110511047A (en) * | 2019-09-30 | 2019-11-29 | 瑞泰马钢新材料科技有限公司 | A method of regenerative magnesia-carbon brick is prepared using aquation impregnation technique |
| CN111099899A (en) * | 2019-12-31 | 2020-05-05 | 巩义市大润昌耐火材料有限公司 | Treatment process of waste magnesia carbon brick regenerated particles |
| CN112279555A (en) * | 2020-10-15 | 2021-01-29 | 天津炜润达新材料科技有限公司 | Method for recycling waste refractory materials |
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