Preparation process of high-temperature-resistant magnesia carbon brick

Abstract

The invention discloses a preparation process of a high-temperature-resistant magnesia carbon brick. The preparation process of the high-temperature-resistant magnesia carbon brick comprises the following steps: (1) proportioning raw materials: proportioning magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, an antioxidant, quartz powder and clay; (2) mixing raw materials: mixing magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, an antioxidant, quartz powder and clay to prepare the raw materials; (3) molding and preparing materials: injecting the mixed raw materials into a magnesia carbon brick mold by adopting an injection machine to complete material preparation; and (4) sinter molding: putting the prepared mold into a kiln for sinter molding. The raw materials adopted in the preparation process of the high-temperature-resistant magnesia carbon brick contain flaky graphite and silicon carbide, so that the high-temperature resistance of the magnesia carbon brick is improved, and the high-temperature resistance and hardness of the magnesia carbon brick are improved, so that the magnesia carbon brick can better adapt to a high-temperature environment during subsequent use, and is safer and more stable during use.

Description

Technical Field

[0001] The invention relates to the technical field of magnesia carbon brick preparation, in particular to a high temperature resistant magnesia carbon brick preparation process. Background Art

[0002] Magnesia carbon bricks are non-burning carbon composite refractory materials made of high melting point basic oxide magnesium oxide (melting point 2800℃) and high melting point carbon material that is difficult to be wetted by slag as raw materials, adding various non-oxide additives and combining them with carbonaceous binders.

[0003] The magnesia carbon brick preparation process on the market, when preparing magnesia carbon bricks, mostly uses simple components such as magnesium powder, magnesium particles, graphite, etc., which leads to the problem of low high temperature resistance after molding. The use environment of magnesia carbon bricks is in a high temperature environment. Magnesium carbon bricks with poor high temperature resistance cannot meet the use requirements of magnesia carbon bricks. For this reason, we propose a high temperature resistant magnesia carbon brick preparation process. Summary of the invention

[0004] The purpose of the present invention is to provide a high temperature resistant magnesia carbon brick preparation process to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a high temperature resistant magnesia carbon brick preparation process, the manufacturing process of the high temperature resistant magnesia carbon brick preparation process has the following steps:

[0006] (1) Proportioning raw materials: Proportioning magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay;

[0007] (2) Mixing raw materials: mixing magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay to prepare raw materials;

[0008] (3) Molding preparation: The mixed raw materials are injected into the magnesia carbon brick mold by an injection machine to complete the material preparation;

[0009] (4) Sintering: Place the prepared mold in a kiln for sintering;

[0010] (5) Finishing treatment: trimming and grinding the magnesia carbon brick products sintered in the kiln to obtain finished magnesia carbon bricks;

[0011] (6) Final inspection: The finished magnesia carbon bricks are subjected to corrosion resistance and hardness tests;

[0012] Preferably, the raw materials are as follows: 30-40 parts of magnesia particles, 10-20 parts of magnesia powder, 5-15 parts of flaky graphite, 5-10 parts of silicon carbide, 3-8 parts of phenolic resin, 4-9 parts of antioxidant, 8-15 parts of quartz powder, and 3-15 parts of clay.

[0013] Preferably, the magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, antioxidant, quartz powder and clay are mixed and stirred for 30-45 minutes at 300-500 revolutions per minute using a mixer.

[0014] Preferably, the molding preparation is as follows: the mold is first preheated to 60-150° C., the mixed raw materials are then injected into the magnesium carbon brick mold by an injection machine, and the mold is vibrated to compact the raw materials in the mold to complete the preparation.

[0015] Preferably, the sintering molding: the prepared mold is placed in a kiln for sintering molding. During sintering, the kiln is first preheated to 900°C, and then the prepared mold is placed in the kiln for sintering for 1-6 hours. During the sintering process, the temperature is gradually increased and finally increased to 1600-2000°C.

[0016] Preferably, the finishing treatment comprises trimming and grinding the magnesia carbon brick product sintered in a kiln to obtain a finished magnesia carbon brick, removing the edge of the magnesia carbon brick by a trimmer, and then grinding the end wall of the magnesia carbon brick to obtain a refined magnesia carbon brick.

[0017] Preferably, the final test is to perform high temperature resistance test and hardness test on the finished magnesia carbon bricks:

[0018] (1) Hardness test: Use Rockwell hardness tester to test the hardness of the formed magnesia carbon bricks;

[0019] (2) High temperature resistance test: Place the finished magnesia carbon bricks in a testing furnace, use 1800-2500℃, and keep them still for 200-500 minutes to test the high temperature resistance of the magnesia carbon bricks.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The raw materials used in the high temperature resistant magnesia carbon brick preparation process contain flaky graphite and silicon carbide, which are used to improve the high temperature resistance of magnesia carbon bricks, increase the high temperature resistance and hardness of magnesia carbon bricks, so that magnesia carbon bricks can better adapt to high temperature environments during subsequent use, and are safer and more stable during use;

[0022] 2. The high temperature resistant magnesia carbon brick preparation process preheats the mold and the kiln, so that the magnesia carbon brick raw materials in the mold are better sintered and formed, and the yield rate of the formed products is higher. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] The present invention provides a technical solution: a high temperature resistant magnesia carbon brick preparation process, the manufacturing process of the high temperature resistant magnesia carbon brick preparation process has the following steps:

[0025] (1) Proportioning raw materials: Proportioning magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay;

[0026] (2) Mixing raw materials: mixing magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay to prepare raw materials;

[0027] (3) Molding preparation: The mixed raw materials are injected into the magnesia carbon brick mold by an injection machine to complete the material preparation;

[0028] (4) Sintering: Place the prepared mold in a kiln for sintering;

[0029] (5) Finishing treatment: trimming and grinding the magnesia carbon brick products sintered in the kiln to obtain finished magnesia carbon bricks;

[0030] (6) Final inspection: The finished magnesia carbon bricks are subjected to corrosion resistance and hardness tests;

[0031] Preferably, the raw materials are as follows: 30-40 parts of magnesia particles, 10-20 parts of magnesia powder, 5-15 parts of flaky graphite, 5-10 parts of silicon carbide, 3-8 parts of phenolic resin, 4-9 parts of antioxidant, 8-15 parts of quartz powder, and 3-15 parts of clay.

[0032] Preferably, the magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, antioxidant, quartz powder and clay are mixed and stirred for 30-45 minutes at 300-500 revolutions per minute using a mixer.

[0033] Preferably, the molding preparation is as follows: the mold is first preheated to 60-150° C., the mixed raw materials are then injected into the magnesium carbon brick mold by an injection machine, and the mold is vibrated to compact the raw materials in the mold to complete the preparation.

[0034] Preferably, the sintering molding: the prepared mold is placed in a kiln for sintering molding. During sintering, the kiln is first preheated to 900°C, and then the prepared mold is placed in the kiln for sintering for 1-6 hours. During the sintering process, the temperature is gradually increased and finally increased to 1600-2000°C.

[0035] Preferably, the finishing treatment comprises trimming and grinding the magnesia carbon brick product sintered in a kiln to obtain a finished magnesia carbon brick, removing the edge of the magnesia carbon brick by a trimmer, and then grinding the end wall of the magnesia carbon brick to obtain a refined magnesia carbon brick.

[0036] Preferably, the final test is to perform high temperature resistance test and hardness test on the finished magnesia carbon bricks:

[0037] (1) Hardness test: Use Rockwell hardness tester to test the hardness of the formed magnesia carbon bricks;

[0038] (2) High temperature resistance test: Place the finished magnesia carbon brick in a testing furnace, use 1800-2500℃, and keep it still for 200-500 minutes to test the high temperature resistance of the magnesia carbon brick product;

[0039] Example 2:

[0040] A high temperature resistant magnesia carbon brick preparation process, the steps of the high temperature resistant magnesia carbon brick preparation process are as follows:

[0041] (1) Proportioning raw materials: Proportioning magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay;

[0042] (2) Mixing raw materials: mixing magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay to prepare raw materials;

[0043] (3) Molding preparation: The mixed raw materials are injected into the magnesia carbon brick mold by an injection machine to complete the material preparation;

[0044] (4) Sintering: Place the prepared mold in a kiln for sintering;

[0045] (5) Finishing treatment: trimming and grinding the magnesia carbon brick products sintered in the kiln to obtain finished magnesia carbon bricks;

[0046] (6) Final inspection: The finished magnesia carbon bricks are subjected to corrosion resistance and hardness tests;

[0047] Preferably, the raw materials are as follows: 35-40 parts of magnesia particles, 15-20 parts of magnesia powder, 10-15 parts of flaky graphite, 5-8 parts of silicon carbide, 5-8 parts of phenolic resin, 5-9 parts of antioxidant, 10-15 parts of quartz powder, and 3-10 parts of clay.

[0048] Preferably, the magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, antioxidant, quartz powder and clay are mixed and stirred for 35-45 minutes at 400-500 revolutions per minute using a mixer.

[0049] Preferably, the molding preparation is as follows: the mold is first preheated to 100-150° C., the mixed raw materials are then injected into the magnesium carbon brick mold by an injection machine, and the mold is vibrated to compact the raw materials in the mold to complete the preparation.

[0050] Preferably, the sintering molding: the prepared mold is placed in a kiln for sintering molding. During sintering, the kiln is first preheated to 900°C, and then the prepared mold is placed in the kiln for sintering for 1-5 hours. During the sintering process, the temperature is gradually increased and finally increased to 1800-2000°C.

[0051] Preferably, the finishing treatment comprises trimming and grinding the magnesia carbon brick product sintered in a kiln to obtain a finished magnesia carbon brick, removing the edge of the magnesia carbon brick by a trimmer, and then grinding the end wall of the magnesia carbon brick to obtain a refined magnesia carbon brick.

[0052] Preferably, the final test is to perform high temperature resistance test and hardness test on the finished magnesia carbon bricks:

[0053] (1) Hardness test: Use Rockwell hardness tester to test the hardness of the formed magnesia carbon bricks;

[0054] (2) High temperature resistance test: Place the finished magnesia carbon brick in a testing furnace, use 2000-2500℃, and keep it still for 300-500 minutes to test the high temperature resistance of the magnesia carbon brick product;

[0055] Example 3:

[0056] A high temperature resistant magnesia carbon brick preparation process, the steps of the high temperature resistant magnesia carbon brick preparation process are as follows:

[0057] (1) Proportioning raw materials: Proportioning magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay;

[0058] (2) Mixing raw materials: mixing magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay to prepare raw materials;

[0059] (3) Molding preparation: The mixed raw materials are injected into the magnesia carbon brick mold by an injection machine to complete the material preparation;

[0060] (4) Sintering: Place the prepared mold in a kiln for sintering;

[0061] (5) Finishing treatment: trimming and grinding the magnesia carbon brick products sintered in the kiln to obtain finished magnesia carbon bricks;

[0062] (6) Final inspection: The finished magnesia carbon bricks are subjected to corrosion resistance and hardness tests;

[0063] Preferably, the raw materials are as follows: 35-38 parts of magnesia particles, 15-18 parts of magnesia powder, 10-12 parts of flaky graphite, 5-6 parts of silicon carbide, 5-7 parts of phenolic resin, 5-8 parts of antioxidant, 10-13 parts of quartz powder, and 5-10 parts of clay.

[0064] Preferably, the magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, antioxidant, quartz powder and clay are mixed and stirred for 35-45 minutes at 450-500 revolutions per minute using a mixer.

[0065] Preferably, the molding preparation is as follows: the mold is first preheated to 120-150° C., the mixed raw materials are then injected into the magnesium carbon brick mold by an injection machine, and the mold is vibrated to compact the raw materials in the mold to complete the preparation.

[0066] Preferably, the sintering molding: the prepared mold is placed in a kiln for sintering molding. During sintering, the kiln is first preheated to 900°C, and then the prepared mold is placed in the kiln for sintering for 2-5 hours. During the sintering process, the temperature is gradually increased and finally increased to 1800-1900°C.

[0067] Preferably, the finishing treatment comprises trimming and grinding the magnesia carbon brick product sintered in a kiln to obtain a finished magnesia carbon brick, removing the edge of the magnesia carbon brick by a trimmer, and then grinding the end wall of the magnesia carbon brick to obtain a refined magnesia carbon brick.

[0068] Preferably, the final test is to perform high temperature resistance test and hardness test on the finished magnesia carbon bricks:

[0069] (1) Hardness test: Use Rockwell hardness tester to test the hardness of the formed magnesia carbon bricks;

[0070] (2) High temperature resistance test: Place the finished magnesia carbon brick in a testing furnace, use 2100-2500℃, stand still for 400-500 minutes, and test the high temperature resistance of the magnesia carbon brick product;

[0071] Example 4:

[0072] A high temperature resistant magnesia carbon brick preparation process, the steps of the high temperature resistant magnesia carbon brick preparation process are as follows:

[0073] (1) Proportioning raw materials: Proportioning magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay;

[0074] (2) Mixing raw materials: mixing magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay to prepare raw materials;

[0075] (3) Molding preparation: The mixed raw materials are injected into the magnesia carbon brick mold by an injection machine to complete the material preparation;

[0076] (4) Sintering: Place the prepared mold in a kiln for sintering;

[0077] (5) Finishing treatment: trimming and grinding the magnesia carbon brick products sintered in the kiln to obtain finished magnesia carbon bricks;

[0078] (6) Final inspection: The finished magnesia carbon bricks are subjected to corrosion resistance and hardness tests;

[0079] Preferably, the raw material ratio is: 38 parts of magnesia particles, 17 parts of magnesia powder, 12 parts of flaky graphite, 6 parts of silicon carbide, 7 parts of phenolic resin, 8 parts of antioxidant, 12 parts of quartz powder, and 10 parts of clay.

[0080] Preferably, the magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, antioxidant, quartz powder and clay are mixed and stirred for 40 minutes at 500 revolutions per minute using a mixer.

[0081] Preferably, the molding preparation is as follows: the mold is first preheated to 145° C., the mixed raw materials are then injected into the magnesium carbon brick mold by an injection machine, and the mold is vibrated to compact the raw materials in the mold to complete the preparation.

[0082] Preferably, the sintering molding: the prepared mold is placed in a kiln for sintering molding. During sintering, the kiln is first preheated to 900°C, and then the prepared mold is placed in the kiln for sintering for 3 hours. During the sintering process, the temperature is gradually increased and finally increased to 1850°C.

[0083] Preferably, the finishing treatment comprises trimming and grinding the magnesia carbon brick product sintered in a kiln to obtain a finished magnesia carbon brick, removing the edge of the magnesia carbon brick by a trimmer, and then grinding the end wall of the magnesia carbon brick to obtain a refined magnesia carbon brick.

[0084] Preferably, the final test is to perform high temperature resistance test and hardness test on the finished magnesia carbon bricks:

[0085] (1) Hardness test: Use Rockwell hardness tester to test the hardness of the formed magnesia carbon bricks;

[0086] (2) High temperature resistance test: The finished magnesia carbon bricks are placed in a testing furnace, at 2300°C, and kept stationary for 500 minutes to test the high temperature resistance of the magnesia carbon bricks.

[0087] Working principle: For this type of high-temperature resistant magnesium carbon brick preparation process, the raw materials contain flaky graphite and silicon carbide, which are used to improve the high-temperature resistance of magnesium carbon bricks, increase the high-temperature resistance and hardness of magnesium carbon bricks, so that the magnesium carbon bricks can better adapt to the high-temperature environment during subsequent use, and are safer and more stable during use. The mold and kiln are preheated to better sinter the magnesium carbon brick raw materials in the mold, and the yield rate of the molded products is higher. In this way, the entire high-temperature resistant magnesium carbon brick preparation process is completed.

[0088] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the appended claims and their equivalents.

Claims

1. A high temperature resistant magnesia carbon brick preparation process, characterized in that: The steps of the preparation process of the high temperature resistant magnesia carbon brick are as follows: (1) Proportioning raw materials: Proportioning magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay; (2) Mixing raw materials: mixing magnesia particles, magnesia powder, flake graphite, silicon carbide, phenolic resin, antioxidant, quartz powder, and clay to prepare raw materials; (3) Molding preparation: The mixed raw materials are injected into the magnesia carbon brick mold by an injection machine to complete the material preparation; (4) Sintering: Place the prepared mold in a kiln for sintering; (5) Finishing treatment: trimming and grinding the magnesia carbon brick products sintered in the kiln to obtain finished magnesia carbon bricks; (6) Final inspection: The finished magnesia carbon bricks are subjected to corrosion resistance and hardness tests.

2. A high temperature resistant magnesia carbon brick preparation process according to claim 1, characterized in that: The raw materials include: 30-40 parts of magnesia particles, 10-20 parts of magnesia powder, 5-15 parts of flaky graphite, 5-10 parts of silicon carbide, 3-8 parts of phenolic resin, 4-9 parts of antioxidant, 8-15 parts of quartz powder and 3-15 parts of clay.

3. The high temperature resistant magnesia carbon brick preparation process according to claim 1, characterized in that: The magnesia particles, magnesia powder, flaky graphite, silicon carbide, phenolic resin, antioxidant, quartz powder and clay are mixed and stirred for 30-45 minutes in a mixer at 300-500 revolutions per minute.

4. The high temperature resistant magnesia carbon brick preparation process according to claim 1, characterized in that: The molding preparation is as follows: the mold is preheated to 60-150° C., the mixed raw materials are injected into the magnesium carbon brick mold by an injection machine, and the mold is vibrated to compact the raw materials in the mold to complete the preparation.

5. The high temperature resistant magnesia carbon brick preparation process according to claim 1, characterized in that: The sintering molding: the prepared mold is placed in a kiln for sintering molding. During sintering, the kiln is first preheated to 900°C, and then the prepared mold is placed in the kiln for sintering for 1-6 hours. During the sintering process, the temperature is gradually increased and finally increased to 1600-2000°C.

6. The high temperature resistant magnesia carbon brick preparation process according to claim 1, characterized in that: The finishing treatment comprises trimming and grinding the magnesia carbon brick product sintered in a kiln to obtain a finished magnesia carbon brick, removing the edge of the magnesia carbon brick by a trimming machine, and then grinding the end wall of the magnesia carbon brick to obtain a refined magnesia carbon brick.

7. The high temperature resistant magnesia carbon brick preparation process according to claim 1, characterized in that: The final test is to test the high temperature resistance and hardness of the finished magnesia carbon bricks: (1) Hardness test: Use Rockwell hardness tester to test the hardness of the formed magnesia carbon bricks; (2) High temperature resistance test: Place the finished magnesia carbon bricks in a testing furnace, use 1800-2500℃, and keep them still for 200-500 minutes to test the high temperature resistance of the magnesia carbon bricks.