CN113912053A - Anti-oxidation furnace charging method in isostatic pressing graphite roasting process - Google Patents
Anti-oxidation furnace charging method in isostatic pressing graphite roasting process Download PDFInfo
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- CN113912053A CN113912053A CN202111094382.5A CN202111094382A CN113912053A CN 113912053 A CN113912053 A CN 113912053A CN 202111094382 A CN202111094382 A CN 202111094382A CN 113912053 A CN113912053 A CN 113912053A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/0806—Charging or discharging devices
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Abstract
The invention belongs to the technical field of graphite production, and particularly relates to an anti-oxidation furnace charging method in an isostatic pressing graphite roasting process, which comprises the following steps: s1, early preparation: preparing a filling material and a crucible; s2, charging: firstly, charging a crucible and then charging a product into the crucible; s3, covering the crucible with a cover: the first layer is laid with the filling material prepared in S1; laying steel plates on the second layer; laying steel bricks on the third layer; and laying steel bricks on the fourth layer. The invention can effectively prevent the product from being oxidized in the roasting process, thereby improving the roasting yield and reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of graphite production, and particularly relates to an anti-oxidation furnace charging method in an isostatic pressing graphite roasting process.
Background
The roasting of isostatic pressing products is a longer process, because the powder of the isostatic pressing products is thinner by 20-6um, while the common medium and coarse products are 0.5-2mm, the stress of the products with thinner powder is larger, the isostatic pressing is cold material forming, while the medium and coarse products are hot press forming, asphalt as a binder has fluidity when hot, and directly becomes solid when cold, the fluidity is not achieved, the bonding effect is not good, and the weakness of the isostatic pressing graphite products is caused by the difference of the forming modes. Therefore, when the isostatic pressing formed product is carbonized by one-time roasting, a long time is needed for the product to be carbonized at a slow speed; according to different product specifications, the roasting time is different, the general hot-press molding roasting time is 600-inch sand the isostatic-pressing product is 1200-inch sand 900-inch sand, so that the problem arises that the capping filler is gradually oxidized due to long-time high-temperature roasting, and the product is also oxidized after the capping filler is completely oxidized, thereby causing the generation of waste products.
The time from the molding of a piece of isostatic pressing product to the finished product is 8 months, so the waste products caused by product oxidation are unfortunately extremely high, and some slight oxidation cannot be reflected in one-time roasting, so the initial oxidation can be reflected after the next working procedure is carried out, and the waste of multiple working procedures is caused.
Disclosure of Invention
Aiming at the technical problems, the invention provides an anti-oxidation furnace charging method in an isostatic pressing graphite roasting process, which can prevent products from being oxidized in the roasting process.
In order to solve the technical problems, the invention adopts the technical scheme that:
an anti-oxidation furnace charging method in an isostatic pressing graphite roasting procedure comprises the following steps:
s1, early preparation: preparing a filling material and a crucible;
s2, charging: firstly, charging a crucible and then charging a product into the crucible;
s3, covering the crucible with a cover: the first layer is laid with the filling material prepared in S1; laying steel plates on the second layer; laying steel bricks on the third layer; and laying steel bricks on the fourth layer.
In said S1: the filling material adopts quartz sand, and the granularity of the quartz sand is 1-3 mm.
Sintering quartz sand as a filler of an isostatic pressing impregnation product; and crushing and screening the sintered quartz sand again, and using the quartz sand as the filler of the isostatic pressing molded product.
In said S1: cleaning impurities, removing rust and removing an oxide layer inside and outside the crucible; after the treatment, the crucible is subjected to an antioxidation treatment with an antioxidation coating.
When the anti-oxidation coating is coated, the outer part of the crucible is coated with the coating, the inner part of the crucible is coated with the coating at the position of one meter below the upper opening of the crucible, the coating is dried in the air for the next time, and the coating is repeatedly carried out for three times.
In said S3: the filling thickness of the first layer of filling material is larger than or equal to 400 mm.
In said S3: after the second layer is paved with steel plates, the side seams of the steel plates are covered by asphalt felts; after paving the steel bricks on the third layer, filling the brick joints with dust removing powder; and after the fourth layer of steel bricks is paved, filling the brick joints with dust removal powder, and then burying the steel bricks with the dust removal powder.
Compared with the prior art, the invention has the following beneficial effects:
the first layer of quartz sand is supplemented by the volatile or burnt filler at the lower part of the crucible, and the heat is transferred to the upper part of the product for sintering, so as to prevent the supplement and prevention line of the product oxidation.
The second layer is paved with steel plates to prevent air and flame from contacting with quartz sand; the felt covers the side seam of the steel plate to prevent a large amount of air and flame from entering the crucible oxidation product from the seam.
The third layer is paved with steel bricks which play a role in balancing weight and reducing the oxidation of the steel plate, wherein the steel bricks rely on the self weight to enable fillers below the steel bricks to be more compact and prevent air and flame from entering; the fine split body is formed by pointing the dust removal powder with about 2000 meshes, so that air and flame can be better prevented from entering, the oxidation of the steel plate can be reduced, and the use times can be increased.
And paving steel bricks on the fourth layer, filling brick joints with dust removal powder, and finally burying the steel bricks with the dust removal powder. The function is that a defense line is added as the function in the step 3.
The invention can effectively prevent the product from being oxidized in the roasting process, thereby improving the roasting yield and reducing the production cost.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An anti-oxidation furnace charging method in an isostatic pressing graphite roasting process is characterized by comprising the following steps:
s1, early preparation: preparing a filling material and a crucible;
s2, charging: firstly, charging a crucible and then charging a product into the crucible;
firstly, the crucible is put into a furnace, and then a product is put into the furnace; therefore, the operation can avoid the condition that the flatness is influenced by swinging caused by the heavy weight of the crucible after the product is filled.
S3, covering the crucible with a cover: the first layer is laid with the filling material prepared in S1; laying steel plates on the second layer; laying steel bricks on the third layer; and laying steel bricks on the fourth layer.
Further, in S1, the filler: selecting quartz sand with the granularity of 1-3 mm; newly purchased quartz sand needs to be sieved firstly to reach the standard; the quartz sand reaching the standard is sintered as the filler of the isostatic pressing dipped product, and the sintered quartz sand can be used as the filler of the isostatic pressing formed product after being crushed and screened again.
By adopting the mode, the balance of all aspects in the heating and firing stage can be ensured; the quartz sand forming device can avoid the phenomenon that the heat transfer of products is influenced by the fact that the quartz sand contains more moisture and more pores and the formed products are fragile and the moisture is discharged and the volatile is absorbed by the pores in the temperature rise, and the heat transfer uniformity in the later period is poor, so that waste products are caused at last.
Further, in S1, a crucible is prepared: checking whether the crucible has a broken part or not, and if the crucible is not broken, the crucible can be used; cleaning impurities, removing rust and removing an oxide layer inside and outside the crucible; and carrying out anti-oxidation treatment on the crucible by using anti-oxidation coating, coating all the periphery of the crucible, coating the inside of the crucible at a position of one meter below the upper opening of the crucible, drying the coating each time, then carrying out next coating, and repeatedly carrying out three coatings.
Further, in S2, crucible charging:
1. hoisting the empty crucible into a furnace box by using a steel wire rope and a related tool;
2. the distance between the crucible charging and discharging walls is larger than or equal to 250mm, and the distance between the crucibles is larger than or equal to 150 mm;
3. the distance between the north and south walls of the crucible charging furnace is not less than 250mm, and the distance between the crucibles is not less than 150 mm.
Further, in S2, the product is crucible-packed:
1. the bottom paving needs to be smooth, and the thickness of the bottom paving material is not less than 100 mm;
2. the loaded product is inspected before charging, and a crucible can be arranged after the product is qualified;
3. when the product is hoisted, the corners and edges of the product need to be protected, felt cloth or rubber is used for being paved at the position of a steel wire rope or a clamping apparatus, and hoisting collision is avoided;
4. the product is centrally arranged in the crucible, the distance between the product and the crucible is not less than 70mm, the interlayer material is not less than 70mm, and the cover material is not less than 500 mm;
the temperature thermocouple of each furnace needs to be fixedly installed in a middle crucible of any box of east and west near the outer wall, and the distance between the thermocouple and the inner wall of the crucible is required to be fixed at the position of 70 mm.
Further, in S3, the crucible cover:
1. the granularity of the first layer of quartz sand is 1-3mm, and the thickness is not less than 400 mm;
2. laying steel plates on the second layer, and then covering the side seams of the steel plates by using a felt;
3. paving steel bricks on the third layer, and filling gaps with dust removing powder;
4. and paving steel bricks on the fourth layer, filling brick joints with dust removal powder, and finally burying the steel bricks with the dust removal powder.
The first layer of quartz sand functions: the filling material volatilized or burnt from the lower part of the crucible is supplemented, and the heat is transferred to the upper part of the product for sintering, so that a supplement defense line for preventing the product from being oxidized is provided.
The second layer is paved with steel plates: the steel plate prevents air and flame from contacting with the quartz sand, and the felt plays a gap where the steel plate is not laid, so that a large amount of air and flame are prevented from entering the crucible oxidation product from the gap.
The third layer has the function of laying steel bricks: the steel brick plays the counter weight and reduces the effect of steel sheet oxidation, and wherein the steel brick relies on self weight to let its below stopping more closely knit and prevents air and flame entering, and carries out the crack with about 2000 meshes's dust removal powder and so thin components of a whole that can function independently can better stop the entering of air and flame, still can reduce the oxidation of steel sheet, increases the number of times of use.
The fourth layer is paved with the steel bricks, and a defense line can be added to the third layer.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (7)
1. An anti-oxidation furnace charging method in an isostatic pressing graphite roasting process is characterized by comprising the following steps:
s1, early preparation: preparing a filling material and a crucible;
s2, charging: firstly, charging a crucible and then charging a product into the crucible;
s3, covering the crucible with a cover: the first layer is laid with the filling material prepared in S1; laying steel plates on the second layer; laying steel bricks on the third layer; and laying steel bricks on the fourth layer.
2. The oxidation-preventing charging method for the isostatic pressing graphite roasting process according to claim 1, wherein the method comprises the following steps: in said S1: the filling material adopts quartz sand, and the granularity of the quartz sand is 1-3 mm.
3. The oxidation-preventing charging method for the isostatic pressing graphite roasting process according to claim 2, wherein: sintering quartz sand as a filler of an isostatic pressing impregnation product; and crushing and screening the sintered quartz sand again, and using the quartz sand as the filler of the isostatic pressing molded product.
4. The oxidation-preventing charging method for the isostatic pressing graphite roasting process according to claim 1, wherein the method comprises the following steps: in said S1: cleaning impurities, removing rust and removing an oxide layer inside and outside the crucible; after the treatment, the crucible is subjected to an antioxidation treatment with an antioxidation coating.
5. The oxidation-preventing charging method for the isostatic pressing graphite roasting process according to claim 4, wherein the method comprises the following steps: when the anti-oxidation coating is coated, the outer part of the crucible is coated with the coating, the inner part of the crucible is coated with the coating at the position of one meter below the upper opening of the crucible, the coating is dried in the air for the next time, and the coating is repeatedly carried out for three times.
6. The oxidation-preventing charging method for the isostatic pressing graphite roasting process according to claim 1, wherein the method comprises the following steps: in said S3: the filling thickness of the first layer of filling material is larger than or equal to 400 mm.
7. The oxidation-preventing charging method for the isostatic pressing graphite roasting process according to claim 1, wherein the method comprises the following steps: in said S3: after the second layer is paved with steel plates, the side seams of the steel plates are covered by asphalt felts; after paving the steel bricks on the third layer, filling the brick joints with dust removing powder; and after the fourth layer of steel bricks is paved, filling the brick joints with dust removal powder, and then burying the steel bricks with the dust removal powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111094382.5A CN113912053B (en) | 2021-09-17 | 2021-09-17 | Anti-oxidation furnace charging method in isostatic pressing graphite roasting process |
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| CN202111094382.5A CN113912053B (en) | 2021-09-17 | 2021-09-17 | Anti-oxidation furnace charging method in isostatic pressing graphite roasting process |
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| CN113912053A true CN113912053A (en) | 2022-01-11 |
| CN113912053B CN113912053B (en) | 2023-02-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102838368A (en) * | 2012-10-08 | 2012-12-26 | 巩义市泰威高温陶瓷材料有限公司 | Fine structure silicon steel hearth roller sleeve and preparation method thereof |
| CN212253625U (en) * | 2020-10-12 | 2020-12-29 | 邓银常 | Carbonization furnace for carbonizing lithium ion battery negative electrode material |
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- 2021-09-17 CN CN202111094382.5A patent/CN113912053B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102838368A (en) * | 2012-10-08 | 2012-12-26 | 巩义市泰威高温陶瓷材料有限公司 | Fine structure silicon steel hearth roller sleeve and preparation method thereof |
| CN212253625U (en) * | 2020-10-12 | 2020-12-29 | 邓银常 | Carbonization furnace for carbonizing lithium ion battery negative electrode material |
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| CN113912053B (en) | 2023-02-28 |
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