CN114162812A - Method for inhibiting graphite anode oxidation ablation rate and graphitization calcining furnace - Google Patents
Method for inhibiting graphite anode oxidation ablation rate and graphitization calcining furnace Download PDFInfo
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- 239000010439 graphite Substances 0.000 title claims abstract description 147
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 147
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 51
- 238000005087 graphitization Methods 0.000 title claims abstract description 49
- 238000001354 calcination Methods 0.000 title claims abstract description 46
- 238000002679 ablation Methods 0.000 title claims abstract description 36
- 230000003647 oxidation Effects 0.000 title claims abstract description 35
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 48
- 230000001590 oxidative effect Effects 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 13
- 230000005484 gravity Effects 0.000 claims abstract description 11
- 230000002829 reductive effect Effects 0.000 claims abstract description 9
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 33
- 239000003830 anthracite Substances 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 26
- 239000002008 calcined petroleum coke Substances 0.000 claims description 23
- 238000003837 high-temperature calcination Methods 0.000 claims description 6
- 238000002048 anodisation reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 18
- 239000000843 powder Substances 0.000 description 12
- 239000002006 petroleum coke Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- 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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Abstract
The invention provides a method for inhibiting graphite anode oxidation ablation rate and a graphitization calcining furnace, wherein the method comprises the following steps: putting the graphite-proof oxide into an inner bin of a stokehold buffer bin of a high-temperature graphitization calciner, wherein the stokehold buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and conventional raw materials are put into the outer bin; the graphite anode is prevented from falling tightly under the action of gravity after graphite oxide enters a coal receiving hopper through a material distribution port of the inner bin, and the graphite anode is coated in the falling process; during the calcination process in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcination process carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode. By adopting the method provided by the invention, the graphite anode is protected in the calcining process, the service time of the graphite anode is prolonged, and the production cost is saved.
Description
Technical Field
The invention relates to the field of coal, in particular to a method for inhibiting graphite anode oxidation ablation rate and a graphitization calcining furnace.
Background
At present, in the carbon industry, a vertical electric calcining furnace is mainly used for calcining anthracite and petroleum coke, and is divided into a common electric calcining furnace and a high-temperature graphitizing calcining furnace, wherein the two calcining furnaces use graphite electrodes as an anode and a cathode. In the calcining process, the upper graphite anode can be gradually shortened due to oxidation and ablation, and the anode needs to be placed down at regular time, so that the graphite electrode is consumed quickly.
However, graphite electrodes are expensive and represent a large proportion of the production cost. If the graphite electrode consumption rate could be reduced, it would help to significantly reduce production costs.
Disclosure of Invention
Based on the problems, the invention provides a method for inhibiting the graphite anode oxidation ablation rate, which solves the problems that in the prior art, the material layer thickness is uneven, the material particle gaps are large, and air is easy to enter a hearth under the action of negative pressure of the hearth in a stokehole buffer bin, and solves the problem that oxidizing gas or free radicals separated out from anthracite which just enters the hearth at high temperature directly contact with a graphite anode to accelerate the graphite anode oxidation ablation rate.
The invention provides a method for inhibiting graphite anodic oxidation ablation rate, which comprises the following steps:
putting the graphite-proof oxide into an inner bin of a stokehold buffer bin of a high-temperature graphitization calciner, wherein the stokehold buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and conventional raw materials are put into the outer bin;
the graphite anode is prevented from falling tightly under the action of gravity after graphite oxide enters a coal receiving hopper through a material distribution port of the inner bin, and the graphite anode is coated in the falling process;
during the calcination process in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcination process carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode.
Further, the graphite-proof oxide includes at least: graphitized anthracite or calcined petroleum coke.
Further, the graphite-proof oxide is in the form of particles, not in the form of powder.
In addition, the particle diameter of the graphite-proof oxide is in the range of 2 to 6 mm.
Furthermore, the method further comprises: the graphite oxide is intermittently added into the coal receiving hopper through the material distribution port of the inner bin, the plugboard of the material distribution port is automatically closed after each feeding, and the graphite oxide is prevented from contacting with the material distribution port to prevent electric conduction.
In addition, graphite-inhibiting oxides are screened out of the fine-grained material produced during high-temperature calcination of conventional raw materials.
The invention provides a graphitization calciner, wherein a stokehold buffer bin of the graphitization calciner is divided into an inner bin and an outer bin, the inner bin is arranged between the outer bin and a graphite anode, and a bin opening inserting plate is arranged at a bin opening of the inner bin;
the graphitization calciner adopts a method for inhibiting the graphite anode oxidation ablation rate to calcine, and the method for inhibiting the graphite anode oxidation ablation rate comprises the following steps:
putting the graphite-proof oxide into an inner bin of a stokehold buffer bin of a high-temperature graphitization calciner, wherein the stokehold buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and conventional raw materials are put into the outer bin;
the graphite anode is prevented from falling tightly under the action of gravity after graphite oxide enters a coal receiving hopper through a material distribution port of the inner bin, and the graphite anode is coated in the falling process;
during the calcination process in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcination process carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode.
Further, the graphite-proof oxide includes at least: graphitized anthracite or calcined petroleum coke.
Further, the graphite-proof oxide is in the form of particles, not in the form of powder.
In addition, the particle diameter of the graphite-proof oxide is in the range of 2 to 6 mm.
The invention solves the problems that in the prior art, the thickness of a material layer is not uniform, the gaps among material particles are large, and air is easy to enter a hearth under the negative pressure action of the hearth in a stokehole buffer bin, and the problem that oxidizing gas or free radicals separated out from anthracite which just enters the hearth directly contact with a graphite anode at high temperature to cause the oxidation ablation rate of the graphite anode to be accelerated. The method for inhibiting the graphite anode oxidation ablation rate provided by the invention can protect the graphite anode in the calcining process, prolong the service time of the graphite anode and save the production cost.
Drawings
FIG. 1 is a flow chart of a method for suppressing the ablation rate of graphite anodization provided in accordance with an embodiment of the present invention;
fig. 2 is a structural view of a graphitization calciner provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a vertical electric calciner in the prior art;
FIG. 4 is a schematic illustration of a graphite anode calcination process provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a graphite anode calcination process according to an embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments and the attached drawings. It is intended that the present invention not be limited to the particular embodiments disclosed, but that the present invention be limited only by the appended claims.
Referring to fig. 1, the present invention provides a method for suppressing graphite anodic oxidation ablation rate, including:
s001, placing graphite-proof oxide into an inner bin of a front buffer bin of a high-temperature graphitization calciner, wherein the front buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and the outer bin is placed with conventional raw materials;
s002, preventing graphite oxide from entering a coal receiving hopper through a material distribution port of the inner bin, enabling the graphite oxide to cling to the graphite anode to descend under the action of gravity, and coating the graphite anode in the descending process;
and S003, in the process of calcining in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcining carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode.
At present, the graphite anode oxidation ablation at the upper part in the graphitization calcining furnace is mainly caused by three reasons:
(1) the upper electrode belongs to an anode, and electrons are easily lost in the calcination process to be oxidized into CO.
(2) The highest temperature of a hearth of the graphitization calciner is 2200-2O、H2、CO、CH4、CO2And COS, etc. Meanwhile, the pyrolysis temperature of the mineral substances (except silicate) such as nitrate, carbonate, sulfide, sulfate and the like in the coal is generally 150-1200 ℃, and SO is generated through decomposition2、NOx、CO2And the like. In the process of the oxidizing gas diffusing from bottom to top in the hearth, the oxidizing gas can generate oxidizing ablation effect when encountering a high-temperature graphite anode.
(3) The smoke of the graphitization calciner is pumped out from the upper part of the furnace cover of the calciner by a draught fan of the waste heat boiler and enters the incineration chamber of the waste heat boiler for combustion, so that an annular cavity below the furnace cover of the graphitization calciner is always positioned in
The negative pressure state of (1). As the raw material coal of the graphitization calciner has the granularity of 10-30mm, small and fine coal blocks have larger gaps, and air is easy to be sucked into a hearth through a material layer in a coal receiving hopper above a furnace cover. At high temperature, the oxidation of the graphite electrode by oxygen in the air is very obvious. As shown in fig. 4 and 5, the graphite anode of the calcining furnace generally has the phenomenon of "bowing", which is common when producing high resistivity products. The "waisting" of graphite anodization is mainly related to oxidizing gases. When the phenomenon is serious, the upper graphite anode can be broken at any time to cause current interruption, and if the broken electrode tip cannot be found and taken out in time, the production operation of the graphitization calciner is greatly influenced.
The invention provides a method for inhibiting graphite anodic oxidation ablation rate, which comprises the following steps:
in the step S001, the graphite-proof oxide is put into an inner bin of a stokehold buffer bin of a high-temperature graphitization calciner, the stokehold buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and the conventional raw materials are put into the outer bin; different materials are put into the inner bin and the outer bin.
S002, preventing graphite oxide from entering a coal receiving hopper through a material distribution port of the inner bin, enabling the graphite oxide to cling to the graphite anode to descend under the action of gravity, and coating the graphite anode in the descending process; because of the action of gravity, the graphite-resistant oxide naturally descends along the graphite anode under the action of gravity after entering the coal hopper along the inner bin, and the graphite anode is wrapped in the descending process, so that the graphite anode is protected.
And S003, in the process of calcining in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcining carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode.
On the basis of the existing vertical graphitization calciner, as shown in fig. 3, the method provided by the invention is characterized in that a coal hopper 11, a raw material buffer bin 13 and a distributor 12 for feeding at the lower part of the raw material buffer bin are used for creatively transforming the front buffer bin, and the front buffer bin is divided into an inner layer and an outer layer, so that the number of the distributor for feeding is doubled, for example, the number of the original 4 distributor is changed into 8. The outer bin is used for storing conventional raw materials such as anthracite or petroleum coke, and the inner bin is used for storing a small amount of calcined anthracite or calcined petroleum coke. In the production process, the self gravity of the raw materials is relied on, the calcined anthracite (or calcined petroleum coke) in the inner bin is tightly attached to the graphite anode and is poured into the coal receiving hopper in front of the furnace by the distributor while the graphite-proof oxide such as anthracite (or petroleum coke) is poured into the hearth, so that the calcined anthracite (or calcined petroleum coke) is coated outside the graphite anode. The graphite oxide such as anthracite (or petroleum coke) is prevented from having good electrical conductivity, and the oxidation erosion of oxidizing gas and free radicals generated in the calcining process of the raw material to the high-temperature graphite electrode can be effectively shielded, so that the graphite anode is protected, and the oxidation ablation rate of the graphite anode is slowed down.
The invention solves the problems that in the prior art, the thickness of a material layer is not uniform, the gaps among material particles are large, and air is easy to enter a hearth under the negative pressure action of the hearth in a stokehole buffer bin, and the problem that oxidizing gas or free radicals separated out from anthracite which just enters the hearth directly contact with a graphite anode at high temperature to cause the oxidation ablation rate of the graphite anode to be accelerated. The method for inhibiting the graphite anode oxidation ablation rate provided by the invention can protect the graphite anode in the calcining process, prolong the service time of the graphite anode and save the production cost.
In one embodiment thereof, the anti-graphite oxide comprises at least: graphitized anthracite or calcined petroleum coke. Through analyzing a plurality of graphite-proof oxides, finally graphitized anthracite or calcined petroleum coke is used as the graphite-proof oxide, and the characteristics of the graphitized anthracite or calcined petroleum coke are very close to those of a graphite anode, so that the graphitized anthracite or calcined petroleum coke can play a role in replacing, oxidizing and protecting the graphite anode.
In one embodiment, the graphite-resistant oxide is in the form of particles, not in the form of a powder.
The particle size of the graphite-resistant oxide, such as calcined anthracite or calcined petroleum coke, should not be too large, nor should it be entirely powder. If the particle size of the material is too large, air is easy to be sucked into the hearth through the material layer, and the oxidation of the graphite electrode is accelerated; if all the materials are powdery, the materials are easy to ablate, agglomerate and have poor flowability.
In one embodiment, the particle diameter of the graphite-proof oxide is in the range of 2-6 mm.
The particle size of the graphite-proof oxide such as calcined anthracite or calcined petroleum coke is not too large, and the particle size of the graphite-proof oxide is not completely powder, so the particle diameter range of the graphite-proof oxide is selected to be 2-6mm, air can be prevented from permeating the particles to be contacted with the graphite anode, and the graphite-proof oxide has good fluidity.
In one embodiment thereof, the method further comprises: the graphite oxide is intermittently added into the coal receiving hopper through the material distribution port of the inner bin, the plugboard of the material distribution port is automatically closed after each feeding, and the graphite oxide is prevented from contacting with the material distribution port to prevent electric conduction.
Because of the very low resistivity of preventing graphite oxide, have good electric conductivity, consequently, when pouring into and prevent graphite oxide such as calcined anthracite or calcined petroleum coke, need realize the automatic of bin opening picture peg according to the material height and open and shut, prevent that calcined anthracite or calcined petroleum coke and the stokehold of top from communicateing and taking place electric leakage, the phenomenon of striking sparks.
In one embodiment thereof, graphite inhibiting oxides are screened from the fine-grained material produced during high-temperature calcination of conventional raw materials.
The anthracite and other raw materials have the phenomena of 'explosion', mechanical friction, extrusion, ablation and the like in the high-temperature calcination process, so that more powder substances are generated in the product, and partial fine-grained materials in the powder substances are screened out to be used as graphite-resistant oxides for slowing down the oxidation ablation rate of the graphite electrode, thereby achieving two purposes.
Referring to fig. 2, the invention also provides a graphitization calciner, wherein a furnace front buffer bin of the graphitization calciner is divided into an inner bin 5 and an outer bin 4, the inner bin 5 is arranged between the outer bin 4 and a graphite anode 6, and a bin opening inserting plate is arranged at a bin opening of the inner bin 5;
graphite negative pole 1 is located the bottom in the graphitization calcining furnace, is furnace material 2 between graphite negative pole 1 and graphite positive pole 6, and the material in raw materials outer bin 4, the raw materials inner bin 5 gets into furnace through receiving coal scuttle 3.
The graphitization calciner adopts a method for inhibiting the graphite anode oxidation ablation rate to calcine, and the method for inhibiting the graphite anode oxidation ablation rate comprises the following steps:
putting the graphite-proof oxide into an inner bin of a stokehold buffer bin of a high-temperature graphitization calciner, wherein the stokehold buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and conventional raw materials are put into the outer bin;
the graphite anode is prevented from falling tightly under the action of gravity after graphite oxide enters a coal receiving hopper through a material distribution port of the inner bin, and the graphite anode is coated in the falling process;
during the calcination process in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcination process carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode.
The invention solves the problems that in the prior art, the thickness of a material layer is not uniform, the gaps among material particles are large, and air is easy to enter a hearth under the negative pressure action of the hearth in a stokehole buffer bin, and the problem that oxidizing gas or free radicals separated out from anthracite which just enters the hearth directly contact with a graphite anode at high temperature to cause the oxidation ablation rate of the graphite anode to be accelerated. The method for inhibiting the graphite anode oxidation ablation rate provided by the invention can protect the graphite anode in the calcining process, prolong the service time of the graphite anode and save the production cost.
In one embodiment thereof, the anti-graphite oxide comprises at least: graphitized anthracite or calcined petroleum coke. Through analyzing a plurality of graphite-proof oxides, finally graphitized anthracite or calcined petroleum coke is used as the graphite-proof oxide, and the characteristics of the graphitized anthracite or calcined petroleum coke are very close to those of a graphite anode, so that the graphitized anthracite or calcined petroleum coke can play a role in replacing, oxidizing and protecting the graphite anode.
In one embodiment, the graphite-resistant oxide is in the form of particles, not in the form of a powder.
The particle size of the graphite-resistant oxide, such as calcined anthracite or calcined petroleum coke, should not be too large, nor should it be entirely powder. If the particle size of the material is too large, air is easy to be sucked into the hearth through the material layer, and the oxidation of the graphite electrode is accelerated; if all the materials are powdery, the materials are easy to ablate, agglomerate and have poor flowability.
In one embodiment, the particle diameter of the graphite-proof oxide is in the range of 2-6 mm.
The particle size of the graphite-proof oxide such as calcined anthracite or calcined petroleum coke is not too large, and the particle size of the graphite-proof oxide is not completely powder, so the particle diameter range of the graphite-proof oxide is selected to be 2-6mm, air can be prevented from permeating the particles to be contacted with the graphite anode, and the graphite-proof oxide has good fluidity.
In one embodiment thereof, the method further comprises: the graphite oxide is intermittently added into the coal receiving hopper through the material distribution port of the inner bin, the plugboard of the material distribution port is automatically closed after each feeding, and the graphite oxide is prevented from contacting with the material distribution port to prevent electric conduction.
Because of the very low resistivity of preventing graphite oxide, have good electric conductivity, consequently, when pouring into and prevent graphite oxide such as calcined anthracite or calcined petroleum coke, need realize the automatic of bin opening picture peg according to the material height and open and shut, prevent that calcined anthracite or calcined petroleum coke and the stokehold of top from communicateing and taking place electric leakage, the phenomenon of striking sparks.
In one embodiment thereof, graphite inhibiting oxides are screened from the fine-grained material produced during high-temperature calcination of conventional raw materials.
The anthracite and other raw materials have the phenomena of 'explosion', mechanical friction, extrusion, ablation and the like in the high-temperature calcination process, so that more powder substances are generated in the product, and partial fine-grained materials in the powder substances are screened out to be used as graphite-resistant oxides for slowing down the oxidation ablation rate of the graphite electrode, thereby achieving two purposes.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
Claims (10)
1. A method of inhibiting the ablation rate of graphite anodization, comprising:
putting the graphite-proof oxide into an inner bin of a stokehold buffer bin of a high-temperature graphitization calciner, wherein the stokehold buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and conventional raw materials are put into the outer bin;
the graphite anode is prevented from falling tightly under the action of gravity after graphite oxide enters a coal receiving hopper through a material distribution port of the inner bin, and the graphite anode is coated in the falling process;
during the calcination process in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcination process carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode.
2. The method of suppressing the ablation rate of anodic oxidation of graphite according to claim 1,
the graphite-resistant oxide includes at least: graphitized anthracite or calcined petroleum coke.
3. The method of suppressing the ablation rate of anodic oxidation of graphite according to claim 2,
the graphite-proof oxide is granular and is not powdery.
4. The method of suppressing the ablation rate of anodic oxidation of graphite according to claim 1,
the particle diameter of the graphite-proof oxide ranges from 2 mm to 6 mm.
5. The method of suppressing the ablation rate of anodic oxidation of graphite according to claim 1,
the method further comprises the following steps: the graphite oxide is intermittently added into the coal receiving hopper through the material distribution port of the inner bin, the plugboard of the material distribution port is automatically closed after each feeding, and the graphite oxide is prevented from contacting with the material distribution port to prevent electric conduction.
6. The method for suppressing the ablation rate of anodic oxidation of graphite according to any one of claims 1 to 5,
the graphite-inhibiting oxide is screened out of the fine-grained material produced during the high-temperature calcination of conventional raw materials.
7. A graphitization calcining furnace is characterized in that,
the front buffer bin of the graphitization calciner is divided into an inner bin and an outer bin, the inner bin is arranged between the outer bin and the graphite anode, and a bin opening inserting plate is arranged at a bin opening of the inner bin;
the graphitization calciner adopts a method for inhibiting the graphite anode oxidation ablation rate to calcine, and the method for inhibiting the graphite anode oxidation ablation rate comprises the following steps:
putting the graphite-proof oxide into an inner bin of a stokehold buffer bin of a high-temperature graphitization calciner, wherein the stokehold buffer bin of the graphitization calciner comprises an inner bin and an outer bin, and conventional raw materials are put into the outer bin;
the graphite anode is prevented from falling tightly under the action of gravity after graphite oxide enters a coal receiving hopper through a material distribution port of the inner bin, and the graphite anode is coated in the falling process;
during the calcination process in the graphitization calcining furnace, the graphite-proof oxide and oxidizing gas or free radicals generated in the calcination process carry out oxidation reaction, so that the oxidation reaction of the graphite anode and the oxidizing gas or free radicals is reduced or avoided, and the chemical characteristics of the graphite-proof oxide are the same as or similar to those of the graphite anode.
8. The graphitization calciner of claim 7,
the graphite-resistant oxide includes at least: graphitized anthracite or calcined petroleum coke.
9. The graphitization calciner of claim 8,
the graphite-proof oxide is granular and is not powdery.
10. The graphitization calciner according to any one of claims 7 to 9,
the particle diameter of the graphite-proof oxide ranges from 2 mm to 6 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1758005A (en) * | 2005-09-02 | 2006-04-12 | 沈阳铝镁设计研究院 | Electric calcining furnace of using volatile and electric calcining method |
| CN102497689A (en) * | 2011-12-02 | 2012-06-13 | 南京理工大学 | Method for improving antioxidation performance of graphite electrode with surface modification |
| CN104925792A (en) * | 2015-06-10 | 2015-09-23 | 四川都江堰西马炭素有限公司 | Method for protecting graphite electrodes from oxidation corrosion |
| WO2019108343A1 (en) * | 2017-11-30 | 2019-06-06 | Nanotek Instruments, Inc. | Anode particulates or cathode particulates and alkali metal batteries containing same |
| CN113388864A (en) * | 2021-06-23 | 2021-09-14 | 中国铝业股份有限公司 | Carbon anode for low-carbon-slag aluminum electrolysis and preparation method thereof |
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2021
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1758005A (en) * | 2005-09-02 | 2006-04-12 | 沈阳铝镁设计研究院 | Electric calcining furnace of using volatile and electric calcining method |
| CN102497689A (en) * | 2011-12-02 | 2012-06-13 | 南京理工大学 | Method for improving antioxidation performance of graphite electrode with surface modification |
| CN104925792A (en) * | 2015-06-10 | 2015-09-23 | 四川都江堰西马炭素有限公司 | Method for protecting graphite electrodes from oxidation corrosion |
| WO2019108343A1 (en) * | 2017-11-30 | 2019-06-06 | Nanotek Instruments, Inc. | Anode particulates or cathode particulates and alkali metal batteries containing same |
| CN113388864A (en) * | 2021-06-23 | 2021-09-14 | 中国铝业股份有限公司 | Carbon anode for low-carbon-slag aluminum electrolysis and preparation method thereof |
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