CN111996555A - Preparation method of prebaked anode dry material - Google Patents
Preparation method of prebaked anode dry material Download PDFInfo
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- CN111996555A CN111996555A CN202010827386.9A CN202010827386A CN111996555A CN 111996555 A CN111996555 A CN 111996555A CN 202010827386 A CN202010827386 A CN 202010827386A CN 111996555 A CN111996555 A CN 111996555A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
- C25C3/12—Anodes
- C25C3/125—Anodes based on carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
- B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/282—Shape or inner surface of mill-housings
- B02C13/284—Built-in screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
Abstract
The invention discloses a preparation method of a prebaked anode dry material, which comprises the steps of firstly, coarsely crushing petroleum coke raw materials to 50-70 mm, calcining to obtain calcined coke, then crushing to below 70mm, screening petroleum coke particles below 3.15mm, adding 3.15-70 mm petroleum coke particles and below 50mm carbonaceous raw materials in a certain proportion into the particles below 3.15mm to form a material A, and mixing the remaining 3.15-70 mm petroleum coke particles and the below 50mm carbonaceous raw materials to obtain a material B; and adding liquid asphalt into the material A and the material B, mixing and pressing to obtain a material C and a material D, and respectively and independently calcining the material C and the material D. According to the situation, the calcined material of the material C is completely or partially used for preparing powder, the calcined material of the material D is firstly used for preparing the calcined petroleum coke aggregate particles required in the anode dry material formula, and the rest is used for preparing the powder. Through technical transformation and production of the method, the prepared calcined coke product has lower resistivity and improved conductivity; balancing trace elements of calcined coke and reducing sulfur; the recovery rate of calcined coke is improved, and the cost is low.
Description
Technical Field
The invention relates to the technical field of electrolytic aluminum production, in particular to a preparation method of a prebaked anode dry material.
Background
The prebaked anode is composed of aggregate and binder, the binder plays a role of binding the aggregate, and the prebaked anode reacts on the electrolytic cell in the working process to generate severe electrochemical reaction, so the quality of the prebaked anode has great influence on the aluminum electrolysis work. If the resistivity of the prebaked anode is too high, the conductivity is affected to increase the electric energy loss of the electrolytic production, and if the sulfur content of the prebaked anode is too high, a large amount of harmful gas is generated to pollute the environment.
Therefore, it is highly desirable to design a method for preparing a dry prebaked anode capable of reducing resistivity and sulfur content.
Disclosure of Invention
It is an object of the present invention to address at least the above-mentioned deficiencies and to provide at least the advantages which will be described hereinafter.
Another object of the present invention is to provide a method for preparing a prebaked anode dry material capable of reducing resistivity and sulfur content.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a method for preparing a dry prebaked anode includes:
firstly, coarsely crushing a petroleum coke raw material to a medium lumpiness of 50-70 mm in advance, and calcining to obtain calcined coke;
crushing the calcined coke to below 70mm to obtain petroleum coke particles, and screening fine petroleum coke particles below 3.15mm and coarse petroleum coke particles between 3.15mm and 70 mm;
step three, mixing 3.15 mm-70 mm coarse petroleum coke particles and less than 50mm petroleum coke raw materials in a certain proportion into the obtained fine petroleum coke particles with the particle size of less than 3.15mm to form a material A; wherein the fine petroleum coke particles with the particle size of less than 3.15mm account for 30 to 45 percent of the weight of the material A;
step four, mixing the residual coarse petroleum coke particles of 3.15 mm-70 mm and the petroleum coke carbonaceous raw material of less than 50mm to obtain a material B;
melting the modified asphalt to obtain liquid asphalt, respectively adding a certain proportion of liquid asphalt into the material A and the material B, mixing and pressing to obtain a material C and a material D, and respectively and independently calcining the material C and the material D;
step six, setting the weight percentage of calcined material C to the total weight of calcined petroleum coke as X, and setting the weight percentage of calcined petroleum coke used for preparing calcined petroleum coke powder in the formula of the prebaked anode dry material to the total weight of calcined petroleum coke raw materials as Y, wherein Y is less than 50%; the total calcined petroleum coke raw materials are as follows: preparing the sum of calcined petroleum coke aggregate particles and calcined petroleum coke powder required in the formula of the prebaked anode dry material;
if X is smaller than Y, grinding all calcined material C into calcined petroleum coke powder, preparing calcined petroleum coke aggregate particles required in a pre-baked anode dry material formula by calcined material D, and grinding the rest calcined petroleum coke powder to supplement the insufficient part of the calcined petroleum coke powder required in the pre-baked anode dry material formula by the calcined petroleum coke aggregate particles;
if X is larger than or equal to Y, grinding part of the calcined C material with the proportion of X being equal to Y into calcined petroleum coke powder, preparing the rest calcined C material into particles with the granularity being not larger than 3.15mm in the calcined petroleum coke aggregate particles required by the formula of the prebaked anode dry material, and completely using the calcined D material to prepare the calcined petroleum coke aggregate particles required by the formula of the prebaked anode dry material.
The resistivity of the dry material prepared by the technical scheme is lower, and the conductivity is improved; balancing trace elements of calcined coke and reducing sulfur; the recovery rate of calcined coke is improved, and the cost is low.
Preferably, in the preparation method of the prebaked anode dry material, in the first step, the moisture content of the petroleum coke carbonaceous raw material is 1.2-3.0%.
Preferably, in the preparation method of the prebaked anode dry material, in the first step, the volatile content of the petroleum coke carbonaceous raw material is 8.0-9.8%.
Preferably, in the preparation method of the prebaked anode dry material, in the first step, ash content of the petroleum coke carbonaceous raw material is 0.30-0.50%.
Preferably, in the preparation method of the prebaked anode dry material, in the first step, the sulfur content of the petroleum coke carbonaceous raw material is 0.70-2.3%.
Preferably, in the preparation method of the prebaked anode dry material, the formulation of the prebaked anode dry material further comprises: residual pole blocks, raw fragments and roasted fragments.
Preferably, in the preparation method of the prebaked anode dry material, the calcined C material has a true density 0.03-0.08 g/cm higher than that of the calcined D material3。
Preferably, in the preparation method of the prebaked anode dry material, the calcined C material has a true density of not less than 2.05g/cm3。
Preferably, in the method for preparing the prebaked anode dry material, a specially designed crushing device is used for crushing the material to improve the crushing efficiency, and the crushing device comprises:
the crushing barrel is of a cylindrical structure, the upper opening of the crushing barrel is open, the lower part of the crushing barrel is of a conical structure, a support frame is arranged below the crushing barrel to support the crushing barrel away from the ground, a first sieve hole is formed in the side wall of the crushing barrel, a second sieve hole is formed in the conical structure, the aperture of the first sieve hole is set to be 50mm or 70mm, and the aperture of the second sieve hole is set to be 3.15mm or 50mm according to needs; a baffle is arranged along the joint of the side part and the lower part of the crushing barrel, is positioned outside the crushing barrel and extends downwards and outwards in an inclined manner so as to separate materials sieved by the first sieve mesh from materials sieved by the second sieve mesh;
the closed cylinder is a cylindrical structure formed by combining a left half cylinder and a right half cylinder, and the left half cylinder and the right half cylinder are respectively matched with the side part of the crushing barrel through telescopic supporting members so as to selectively close the first sieve pore;
the crushing rotor is of a cylindrical structure and is concentrically and rotatably arranged in the crushing barrel, a space is formed between the crushing rotor and the inner wall of the crushing barrel to form a crushing space, materials are added from the upper opening of the crushing barrel and enter the crushing space, and the materials are crushed when the crushing rotor and the crushing barrel rotate relatively; the crushing rotor includes: the crushing device comprises a rotor body, a crushing bulge arranged on the side surface of the rotor body and a conical auxiliary body concentrically arranged at the lower part of the rotor body, wherein a groove part is arranged on the surface of the rotor body, extends along the length direction of the rotor body and is parallel to the central axis of the rotor body, the crushing bulge is in sliding fit with the groove part, a first electric telescopic rod is arranged inside the rotor body and supports the crushing bulge so as to adjust the degree of the crushing bulge protruding out of the surface of the rotor body, and a uniform concave-convex part is arranged along the length direction of the crushing bulge, wherein the width of the concave part is 50mm or 70mm, so that the concave-convex part is beneficial to crushing materials; a second electric telescopic rod supporting a conical auxiliary body is further arranged in the rotor main body, the second electric telescopic rod stretches to adjust the distance between the conical auxiliary body and the lower portion of the crushing barrel, and the conical side wall of the conical auxiliary body is parallel to the conical inner wall of the lower portion of the crushing barrel to form an equidistant crushing region;
the lifting mechanism comprises a lifting arm and a driving motor arranged at the lower end of the lifting arm, the driving motor is connected with the crushing rotor to drive the crushing rotor, and the lifting arm is lifted to move the crushing rotor into or out of the crushing barrel;
control module, it is including setting up first range finding sensor, second range finding sensor, the controller of setting on the vice body of toper in broken arch, the controller is connected with first range finding sensor, second range finding sensor, first electric telescopic handle and second electric telescopic handle respectively, first range finding sensor is used for responding to broken protruding and broken bucket inside interval, and second range finding sensor is used for measuring the interval of the vice body of toper and broken bucket lower part, the controller is flexible according to first electric telescopic handle of first range finding sensor control, and is flexible according to second range finding sensor's signal control second electric telescopic handle.
In the traditional preparation method, the raw materials are required to be respectively put into different crushers to be crushed to obtain the materials with specific particle sizes, and then the materials with corresponding particle sizes are obtained by sieving, so that the crushing efficiency is low on one hand, and the crushed particle sizes are uncontrollable on the other hand, and the materials with target particle sizes are difficult to obtain.
In order to solve the problem, the applicant designs a special crushing device, in the device, a crushing space is formed by a crushing rotor and the inner wall of a crushing barrel, the protrusion degree of a crushing protrusion is adjusted so as to adjust the distance between the crushing rotor and the inner wall of the crushing barrel, for example, if materials with the particle size of less than 70mm are to be obtained, the distance between the crushing protrusion and the inner wall of the crushing barrel can be adjusted to be 70mm, the materials enter the crushing space from the upper opening of the crushing barrel and are crushed to obtain the materials with the particle size of less than 70mm, when the materials with the particle size are needed, a closed barrel is lifted so that a first sieve pore is unblocked, and the materials with the particle size; when materials with finer particle diameters are needed, if the materials are 50mm, the sealing barrel is put down to seal the first sieve holes, the distance between the conical auxiliary body and the lower part of the crushing barrel is adjusted to be 50mm, the materials continue to be crushed by the crushing bulges and enter a crushing interval formed by the conical auxiliary body and the lower part of the crushing barrel, the materials with the particle diameter below 50mm are formed under the action of the conical auxiliary body and the crushing barrel, and then the materials are leaked from the second sieve holes to obtain the materials with the particle diameters.
According to the scheme, the crushing of multiple target particle size materials of one crusher can be realized, and the crushing efficiency is improved; meanwhile, the crushing space and the crushing distance are adjustable, the material with various particle sizes can be adapted and obtained, the applicability is improved, the crushed particle size is more controllable, and the yield of the material with the target particle size is high.
The invention at least comprises the following beneficial effects:
the resistivity of the dry material prepared by the method is lower, and the conductivity is improved; balancing trace elements of calcined coke and reducing sulfur; the recovery rate of calcined coke is improved, and the cost is low.
The invention designs a special crushing device, wherein a crushing space is formed between a crushing rotor and the inner wall of a crushing barrel, the protrusion degree of a crushing protrusion is adjusted so as to adjust the distance between the crushing rotor and the inner wall of the crushing barrel, for example, if a material with a particle size of below 70mm is to be obtained, the distance between the crushing protrusion and the inner wall of the crushing barrel can be adjusted to be 70mm, the material enters the crushing space from the upper opening of the crushing barrel and is crushed to obtain the material with the particle size of below 70mm, when the material with the particle size is needed, a closed barrel is lifted so that a first sieve pore is unblocked, and the material with the particle size leaks out of the first sieve pore; when materials with finer particle diameters are needed, if the materials are 50mm, the sealing barrel is put down to seal the first sieve holes, the distance between the conical auxiliary body and the lower part of the crushing barrel is adjusted to be 50mm, the materials continue to be crushed by the crushing bulges and enter a crushing interval formed by the conical auxiliary body and the lower part of the crushing barrel, the materials with the particle diameter below 50mm are formed under the action of the conical auxiliary body and the crushing barrel, and then the materials are leaked from the second sieve holes to obtain the materials with the particle diameters.
The crushing device can realize the crushing of a plurality of target particle size materials of one crusher, and improves the crushing efficiency; meanwhile, the crushing space and the crushing distance are adjustable, the material with various particle sizes can be adapted and obtained, the applicability is improved, the crushed particle size is more controllable, and the yield of the material with the target particle size is high.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the crushing apparatus according to the present invention;
FIG. 2 is a schematic top view of the crushing barrel of the present invention;
FIG. 3 is a schematic vertical cross-sectional view of the crushing rotor of the present invention;
FIG. 4 is a schematic view of the structure of the crushing protrusions according to the present invention;
fig. 5 is a schematic structural view of the closed cylinder of the present invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
As shown in fig. 1 to 5, the crushing apparatus includes:
the crushing barrel 1 is of a cylindrical structure, the upper opening of the crushing barrel is open, the lower part of the crushing barrel is of a conical structure 6, a support frame 7 is arranged below the crushing barrel 1 to support the crushing barrel 1 away from the ground, a first sieve hole is formed in the side wall of the crushing barrel 1, a second sieve hole is formed in the conical structure 6, the aperture of the first sieve hole is set to be 50mm or 70mm, and the aperture of the second sieve hole is set to be 3.15mm or 50mm according to needs; a baffle plate 8 is arranged at the joint of the side part and the lower part of the crushing barrel 1, and the baffle plate 8 is positioned outside the crushing barrel 1 and extends downwards and outwards in an inclined mode so as to isolate materials screened out by the first sieve holes from materials screened out by the second sieve holes.
As shown in fig. 5, the closed cylinder is a cylindrical structure formed by combining a left half cylinder 15 and a right half cylinder 16, and the left half cylinder 15 and the right half cylinder 16 are respectively fitted to the side of the crushing barrel 1 through telescopic support members 17 to selectively close the first sieve holes.
As shown in fig. 1-4, the crushing rotor is a cylindrical structure and is concentrically and rotatably arranged in the crushing barrel 1, a space is formed between the crushing rotor and the inner wall of the crushing barrel 1 to form a crushing space 4, a material is added from the upper opening of the crushing barrel 1 and enters the crushing space 4, and the material is crushed when the crushing rotor and the crushing barrel 1 relatively rotate; the crushing rotor includes: the crushing device comprises a rotor body 3, a crushing bulge 11 arranged on the side surface of the rotor body 3, and a conical auxiliary body 5 concentrically arranged at the lower part of the rotor body 3, wherein a groove part is arranged on the surface of the rotor body 3, the groove part extends along the length direction of the rotor body 3 and is parallel to the central axis of the rotor body 3, the crushing bulge 11 is in sliding fit with the groove part, a first electric telescopic rod 12 is arranged inside the rotor body 3 and supports the crushing bulge 11 so as to adjust the degree of the crushing bulge 11 protruding out of the surface of the rotor body 3, as shown in fig. 4, a uniform concave-convex part 14 is arranged along the length direction of the crushing bulge 11, the width of the concave part is 50mm or 70mm, and the concave-convex part is beneficial to; rotor main part 3 is inside still to be provided with second electric telescopic handle 13 and to support the vice body 5 of toper, second electric telescopic handle 13 stretches out and draws back in order to adjust the interval of the vice body 5 of toper and broken 1 lower part of bucket, the toper lateral wall of the vice body 5 of toper is parallel with the toper inner wall of broken 1 lower part of bucket in order to form equidistance broken interval 5.
And the lifting mechanism comprises a lifting arm 10 and a driving motor 9 arranged at the lower end of the lifting arm, the driving motor 9 is connected with the crushing rotor 3 to drive the crushing rotor 3, and the lifting arm 10 is lifted to move the crushing rotor 3 into or out of the crushing barrel 1.
Control module, it is including setting up first range finding sensor on broken arch 11, setting up second range finding sensor, the controller on the vice body 5 of toper, the controller is connected with first range finding sensor, second range finding sensor, first electric telescopic handle 12 and second electric telescopic handle 13 respectively, first range finding sensor is used for responding to broken protruding and broken bucket inside interval, and second range finding sensor is used for measuring the interval of the vice body of toper and broken bucket lower part, the controller is flexible according to first electric telescopic handle of first range finding sensor control, and is flexible according to second range finding sensor's signal control second electric telescopic handle. When the crusher is used, the control module is used for adjusting the indirect connection, and then the crushing rotor is started for crushing.
When the crushing device is implemented, a crushing space is formed between the crushing rotor and the inner wall of the crushing barrel, the protrusion degree of the crushing protrusion is adjusted, and then the distance between the crushing rotor and the inner wall of the crushing barrel is adjusted, for example, if materials with the particle size of below 70mm are to be obtained, the distance between the adjusting crushing protrusion and the inner wall of the crushing barrel can be adjusted to be 70mm, the materials enter the crushing space from the upper opening of the crushing barrel and are crushed to obtain the materials with the particle size of below 70mm, when the materials with the particle size are needed, the closed barrel is lifted to enable the first sieve mesh to be unblocked, and the materials; when materials with finer particle diameters are needed, if the materials are 50mm, the sealing barrel is put down to seal the first sieve holes, the distance between the conical auxiliary body and the lower part of the crushing barrel is adjusted to be 50mm, the materials continue to be crushed by the crushing bulges and enter a crushing interval formed by the conical auxiliary body and the lower part of the crushing barrel, the materials with the particle diameter below 50mm are formed under the action of the conical auxiliary body and the crushing barrel, and then the materials are leaked from the second sieve holes to obtain the materials with the particle diameters.
A preparation method of a prebaked anode dry material comprises the following steps:
firstly, coarsely crushing a petroleum coke raw material to a medium lumpiness of 50-70 mm in advance, and calcining to obtain calcined coke;
crushing the calcined coke to below 70mm to obtain petroleum coke particles, and screening fine petroleum coke particles below 3.15mm and coarse petroleum coke particles between 3.15mm and 70 mm;
step three, mixing 3.15 mm-70 mm coarse petroleum coke particles and less than 50mm petroleum coke raw materials in a certain proportion into the obtained fine petroleum coke particles with the particle size of less than 3.15mm to form a material A; wherein the fine petroleum coke particles with the particle size of less than 3.15mm account for 30 to 45 percent of the weight of the material A;
step four, mixing coarse petroleum coke particles of 3.15 mm-70 mm and petroleum coke carbonaceous raw materials of less than 50mm to obtain a material B;
melting the modified asphalt to obtain liquid asphalt, respectively adding a certain proportion of liquid asphalt into the material A and the material B, mixing and pressing to obtain a material C and a material D, and respectively and independently calcining the material C and the material D;
step six, setting the weight percentage of calcined material C to the total weight of calcined petroleum coke as X, and setting the weight percentage of calcined petroleum coke used for preparing calcined petroleum coke powder in the formula of the prebaked anode dry material to the total weight of calcined petroleum coke raw materials as Y, wherein Y is less than 50%; the total calcined petroleum coke raw materials are as follows: preparing the sum of calcined petroleum coke aggregate particles and calcined petroleum coke powder required in the formula of the prebaked anode dry material;
if X is smaller than Y, grinding all calcined material C into calcined petroleum coke powder, preparing calcined petroleum coke aggregate particles required in a pre-baked anode dry material formula by calcined material D, and grinding the rest calcined petroleum coke powder to supplement the insufficient part of the calcined petroleum coke powder required in the pre-baked anode dry material formula by the calcined petroleum coke aggregate particles;
if X is larger than or equal to Y, grinding part of the calcined C material with the proportion of X being equal to Y into calcined petroleum coke powder, preparing the rest calcined C material into particles with the granularity being not larger than 3.15mm in the calcined petroleum coke aggregate particles required by the formula of the prebaked anode dry material, and completely using the calcined D material to prepare the calcined petroleum coke aggregate particles required by the formula of the prebaked anode dry material.
The resistivity of the dry material prepared by the technical scheme is lower, and the conductivity is improved; balancing trace elements of calcined coke and reducing sulfur; the recovery rate of calcined coke is improved, and the cost is low.
Further, in the first step, the moisture content of the petroleum coke carbonaceous raw material is 1.2% -3.0%.
Further, in the step one, the volatile content of the petroleum coke carbonaceous raw material is 8.0% -9.8%.
Further, in the first step, the ash content of the petroleum coke carbonaceous raw material is 0.30-0.50%.
Further, in the step one, the sulfur content of the petroleum coke carbonaceous raw material is 0.70% -2.3%.
Further, the formula of the prebaked anode dry material further comprises: residual pole blocks, raw fragments and roasted fragments.
Furthermore, the true density of the calcined material C is 0.03-0.08 g/cm higher than that of the calcined material D3。
Further, the true density of the calcined C material is not less than 2.05g/cm3。
Example 1
A preparation method of a prebaked anode dry material comprises the following steps:
firstly, coarsely crushing a petroleum coke raw material to a medium lumpiness of 50-70 mm in advance, and calcining to obtain calcined coke; the water content of the petroleum coke carbonaceous raw material is 1.2-3.0 percent; the volatile content of the petroleum coke carbonaceous raw material is 8.0-9.8%; ash content of the petroleum coke carbonaceous raw material is 0.30-0.50%; the sulfur content of the petroleum coke carbonaceous raw material is 0.70-2.3%.
Crushing the calcined coke to below 70mm to obtain petroleum coke particles, and screening fine petroleum coke particles below 3.15mm and coarse petroleum coke particles between 3.15mm and 70 mm;
step three, mixing 3.15 mm-70 mm coarse petroleum coke particles and less than 50mm petroleum coke raw materials in a certain proportion into the obtained fine petroleum coke particles with the particle size of less than 3.15mm to form a material A; wherein, the fine petroleum coke particles with the diameter less than 3.15mm account for 30 percent of the weight of the material A;
step four, mixing the residual coarse petroleum coke particles of 3.15 mm-70 mm and the petroleum coke carbonaceous raw material of less than 50mm to obtain a material B;
step five, melting the modified asphalt to obtain liquid asphalt, respectively adding a certain proportion of liquid asphalt into the material A and the material B, mixing and pressing to obtain a material C and a material D (the mass ratio of the material A to the asphalt is 4:1, and the material B to the asphalt is 4:1), and respectively and independently calcining the material C and the material D; the calcined C material has a true density of 2.05g/cm3(ii) a The calcined D material has a true density of 2.08g/cm3；
Step six, the weight of calcined material C accounts for 47 percent of the weight of all calcined petroleum coke, and the formula of the prebaked anode dry material comprises the following components in percentage by weight: calcined petroleum coke aggregate particles: calcined petroleum coke powder: a residual pole block: crushing: roasting and crushing 45:35:10:5: 5; the weight percentage of the calcined petroleum coke used for preparing the calcined petroleum coke powder in the formula of the prebaked anode dry material to the total calcined petroleum coke raw material is 43.75 percent and is less than 50 percent; the total calcined petroleum coke raw materials are as follows: preparing the sum of calcined petroleum coke aggregate particles and calcined petroleum coke powder required in the formula of the prebaked anode dry material;
because X is less than Y, the calcined material C is completely ground into calcined petroleum coke powder, calcined material D is firstly prepared into calcined petroleum coke aggregate particles required in the formula of the prebaked anode dry material, and the rest calcined material D is ground into calcined petroleum coke powder for supplementing the insufficient part of the calcined petroleum coke powder required in the formula of the prebaked anode dry material;
and mixing the dry material formula to obtain the prebaked anode dry material.
Example 2
The difference from the embodiment 1 is that the crushing device is used for crushing the petroleum coke carbonaceous raw material and the calcined coke so as to improve the crushing efficiency and reduce the traditional crushing process.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art.
Claims (9)
1. The preparation method of the prebaked anode dry material is characterized by comprising the following steps of:
firstly, coarsely crushing a petroleum coke raw material to a medium lumpiness of 50-70 mm in advance, and calcining to obtain calcined coke;
crushing the calcined coke to below 70mm to obtain petroleum coke particles, and screening fine petroleum coke particles below 3.15mm and coarse petroleum coke particles between 3.15mm and 70 mm;
step three, mixing 3.15 mm-70 mm coarse petroleum coke particles and less than 50mm petroleum coke raw materials in a certain proportion into the obtained fine petroleum coke particles with the particle size of less than 3.15mm to form a material A; wherein the fine petroleum coke particles with the particle size of less than 3.15mm account for 30 to 45 percent of the weight of the material A;
step four, mixing coarse petroleum coke particles of 3.15 mm-70 mm and petroleum coke carbonaceous raw materials of less than 50mm to obtain a material B;
melting the modified asphalt to obtain liquid asphalt, respectively adding a certain proportion of liquid asphalt into the material A and the material B, mixing and pressing to obtain a material C and a material D, and respectively and independently calcining the material C and the material D;
step six, setting the weight percentage of calcined material C to the total weight of calcined petroleum coke as X, and setting the weight percentage of calcined petroleum coke used for preparing calcined petroleum coke powder in the formula of the prebaked anode dry material to the total weight of calcined petroleum coke raw materials as Y, wherein Y is less than 50%; the total calcined petroleum coke raw materials are as follows: preparing the sum of calcined petroleum coke aggregate particles and calcined petroleum coke powder required in the formula of the prebaked anode dry material;
if X is smaller than Y, grinding all calcined material C into calcined petroleum coke powder, preparing calcined petroleum coke aggregate particles required in a pre-baked anode dry material formula by calcined material D, and grinding the rest calcined petroleum coke powder to supplement the insufficient part of the calcined petroleum coke powder required in the pre-baked anode dry material formula by the calcined petroleum coke aggregate particles;
if X is larger than or equal to Y, grinding part of the calcined C material with the proportion of X being equal to Y into calcined petroleum coke powder, preparing the rest calcined C material into particles with the granularity being not larger than 3.15mm in the calcined petroleum coke aggregate particles required by the formula of the prebaked anode dry material, and completely using the calcined D material to prepare the calcined petroleum coke aggregate particles required by the formula of the prebaked anode dry material.
2. The method for preparing the dry prebaked anode material according to claim 1, wherein in the first step, the moisture content of the petroleum coke carbonaceous raw material is 1.2 to 3.0%.
3. The method for preparing the dry prebaked anode material according to claim 1, wherein in the first step, the volatile content of the petroleum coke carbonaceous raw material is 8.0% to 9.8%.
4. The method for preparing the dry prebaked anode material according to claim 1, wherein in the first step, the ash content of the petroleum coke carbonaceous raw material is 0.30 to 0.50%.
5. The method for preparing the dry prebaked anode material according to claim 1, wherein in the first step, the sulfur content of the petroleum coke carbonaceous raw material is 0.70 to 2.3%.
6. The method for preparing the dry prebaked anode material according to claim 1, wherein the formulation of the dry prebaked anode material further comprises: residual pole blocks, raw fragments and roasted fragments.
7. The method for preparing the dry prebaked anode material according to claim 1, wherein the calcined material C has a true density 0.03 to 0.08g/cm higher than that of the calcined material D3。
8. The method for preparing the dry prebaked anode material according to claim 1, wherein the calcined C material has a true density of not less than 2.05g/cm3。
9. The method for preparing dry prebaked anode material according to claim 1, wherein the material is crushed by a specially designed crushing apparatus for improving crushing efficiency, said crushing apparatus comprising:
the crushing barrel is of a cylindrical structure, the upper opening of the crushing barrel is open, the lower part of the crushing barrel is of a conical structure, a support frame is arranged below the crushing barrel to support the crushing barrel away from the ground, a first sieve hole is formed in the side wall of the crushing barrel, a second sieve hole is formed in the conical structure, the aperture of the first sieve hole is set to be 50mm or 70mm, and the aperture of the second sieve hole is set to be 3.15mm or 50mm according to needs; a baffle is arranged along the joint of the side part and the lower part of the crushing barrel, is positioned outside the crushing barrel and extends downwards and outwards in an inclined manner so as to separate materials sieved by the first sieve mesh from materials sieved by the second sieve mesh;
the closed cylinder is a cylindrical structure formed by combining a left half cylinder and a right half cylinder, and the left half cylinder and the right half cylinder are respectively matched with the side part of the crushing barrel through telescopic supporting members so as to selectively close the first sieve pore;
the crushing rotor is of a cylindrical structure and is concentrically and rotatably arranged in the crushing barrel, a space is formed between the crushing rotor and the inner wall of the crushing barrel to form a crushing space, materials are added from the upper opening of the crushing barrel and enter the crushing space, and the materials are crushed when the crushing rotor and the crushing barrel rotate relatively; the crushing rotor includes: the rotor comprises a rotor body, a crushing bulge arranged on the side surface of the rotor body and a conical auxiliary body concentrically arranged at the lower part of the rotor body, wherein a groove part is arranged on the surface of the rotor body, extends along the length direction of the rotor body and is parallel to the central axis of the rotor body, the crushing bulge is in sliding fit with the groove part, a first electric telescopic rod is arranged inside the rotor body and supports the crushing bulge so as to adjust the degree of the crushing bulge protruding out of the surface of the rotor body, and a uniform concave-convex part is arranged along the length direction of the crushing bulge, wherein the width of the concave part is 50mm or 70 mm; a second electric telescopic rod supporting a conical auxiliary body is further arranged in the rotor main body, the second electric telescopic rod stretches to adjust the distance between the conical auxiliary body and the lower portion of the crushing barrel, and the conical side wall of the conical auxiliary body is parallel to the conical inner wall of the lower portion of the crushing barrel to form an equidistant crushing region;
the lifting mechanism comprises a lifting arm and a driving motor arranged at the lower end of the lifting arm, the driving motor is connected with the crushing rotor to drive the crushing rotor, and the lifting arm is lifted to move the crushing rotor into or out of the crushing barrel;
control module, it is including setting up first range finding sensor, second range finding sensor, the controller of setting on the vice body of toper in broken arch, the controller is connected with first range finding sensor, second range finding sensor, first electric telescopic handle and second electric telescopic handle respectively, first range finding sensor is used for responding to broken protruding and broken bucket inside interval, and second range finding sensor is used for measuring the interval of the vice body of toper and broken bucket lower part, the controller is flexible according to first electric telescopic handle of first range finding sensor control, and is flexible according to second range finding sensor's signal control second electric telescopic handle.
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| CN115849908A (en) * | 2022-12-23 | 2023-03-28 | 湖南嘉力亚新材料有限公司 | Preparation method of prebaked anode with super-strong oxidation resistance |
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