CN113912053B

CN113912053B - Anti-oxidation furnace charging method in isostatic pressing graphite roasting process

Info

Publication number: CN113912053B
Application number: CN202111094382.5A
Authority: CN
Inventors: 刘伟凯; 张培模; 袁晓辉; 张培林
Original assignee: Datong Xincheng New Material Co Ltd
Current assignee: Datong Xincheng New Material Co Ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2023-02-28
Anticipated expiration: 2041-09-17
Also published as: CN113912053A

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 and charging: firstly, charging a crucible and then charging a product into the crucible; s3, covering the crucible: paving the filling material prepared in the step S1 on the first layer; 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

Anti-oxidation furnace charging method in isostatic pressing graphite roasting process

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 specifications of products, the roasting time is different, the hot press molding roasting time is generally 450-600h, and the isostatic pressing product is 900-1200h, 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 waste products.

The time from the molding of an isostatic product to the finishing of the product is 8 months, so waste products caused by product oxidation are unfortunately extremely high, and slight oxidation cannot be reflected in one-time roasting, so that 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 technical scheme adopted by the invention is as follows:

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 and charging: firstly, loading a crucible into a furnace, and then loading a product into the crucible;

s3, covering the crucible: paving the filling material prepared in the step S1 on the first layer; laying steel plates on the second layer; laying steel bricks on the third layer; and laying steel bricks on the fourth layer.

In the S1: the filling material adopts quartz sand, and the granularity of the quartz sand is 1-3mm.

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 a filling material of the isostatic compaction product.

In the 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 the S3: the filling thickness of the first layer of filling material is larger than or equal to 400mm.

In the 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; after the fourth layer is paved with the steel bricks, the gaps of the bricks are filled with the dust removal powder, and then the steel bricks are buried 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 steel plate edge seam to prevent a great deal of air and flame from drilling into 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 of the 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;

firstly, putting the crucible into a furnace, and then putting the product; 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: paving the filling material prepared in the step S1 on the first layer; 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 1-3mm; 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 150mm;

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 150mm.

Further, in S2, the product is filled into a crucible:

1. the bottom paving needs to be smooth, and the thickness of the bottom paving material is not less than 100mm;

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 the edge rhombuses of the product need to be protected, felt cloth or rubber is used for paving the product at the position of the steel wire rope or the clamp, and hoisting collision damage 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 500mm;

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 top:

1. the granularity of the first layer of quartz sand is 1-3mm, and the thickness is not less than 400mm;

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 of steel plate laying function: 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 drilling into crucible oxidation products 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 make its below filler closely knit and prevents air and flame entering more, and carries out the pointing with about 2000 meshes dust removal powder and so thin components of a whole that can be better the entering of prevention air and flame, still can reduce the oxidation of steel sheet, increases the number of times of using.

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

1. An anti-oxidation furnace charging method in an isostatic pressing graphite roasting procedure is characterized by comprising the following steps:

s1, early preparation: preparing a filling material and a crucible; the filling material adopts quartz sand, and the granularity of the quartz sand is 1-3mm; sintering quartz sand as a filler of an isostatic pressing impregnation product; crushing and screening the sintered quartz sand again, and using the crushed quartz sand as a filling material of an isostatic pressing molded product; cleaning impurities, removing rust and removing an oxide layer inside and outside the crucible; after treatment, carrying out antioxidation treatment on the crucible by using an antioxidation coating;

s2, charging and charging: firstly, charging a crucible and then charging a product into the crucible;

s3, covering the crucible: the prepared filling material of S1 is paved on the first layer, and the filling thickness of the filling material of the first layer is not less than 400mm; laying steel plates on the second layer, and covering the steel plate side seams with felt after laying the steel plates on the second layer; paving steel bricks on the third layer, and filling brick gaps with dust removing powder after paving the steel bricks on the third layer; and paving the steel bricks on the fourth layer, filling the gaps of the bricks with dust removing powder, and burying the steel bricks with the dust removing powder.

2. The oxidation-preventing charging method in the isostatic pressing graphite roasting process as claimed in claim 1, wherein: 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.