CN108059155B - Graphite stirring rod and roasting method thereof - Google Patents
Graphite stirring rod and roasting method thereof Download PDFInfo
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- CN108059155B CN108059155B CN201711240577.XA CN201711240577A CN108059155B CN 108059155 B CN108059155 B CN 108059155B CN 201711240577 A CN201711240577 A CN 201711240577A CN 108059155 B CN108059155 B CN 108059155B
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Abstract
The invention relates to the technical field of graphite roasting, in particular to a graphite stirring rod and a roasting method thereof, wherein the volume density of the graphite stirring rod is 1.751-1.782 g/cm3Coefficient of thermal expansionIs 2.5 multiplied by 106～2.8×106The bending strength is 13.28-14.92 MPa at/DEG C; the roasting method comprises the steps of paving and tamping a filling material at the bottom of a roasting furnace, arranging metal grids vertical to the gravity direction on the filling material, enabling the axis of a graphite stirring rod to form a certain included angle with the gravity direction and be placed in the metal grids, filling and tamping gaps between the graphite stirring rod and the metal grids by using the filling material, and roasting according to a roasting process curve. The roasting method of the graphite stirring rod provided by the invention is different from the common horizontal roasting in the prior art, the thermal expansion coefficient and the breaking strength of the roasted graphite stirring rod are improved, the roasting time is greatly reduced by using a special roasting curve, and the energy and the cost are saved.
Description
Technical Field
The invention relates to the technical field of graphite roasting, in particular to a graphite stirring rod and a roasting method thereof.
Background
Because the diameter of the graphite stirring rod is thin, the graphite stirring rod can not be vertically installed generally, the method is similar to the roasting and furnace loading mode of common graphite products, and the graphite stirring rod is often roasted with other large-size graphite products at the same time, and the used roasting curve is also long.
The existing charging method is that the graphite stirring rod product is directly horizontally arranged in a ring type roasting furnace, a layer of filling material is paved on the horizontally arranged layer, and the filling material only adopts metallurgical coke. Therefore, when the graphite stirring rod is roasted and heated, a part of the filler can sink, asphalt exists in the raw materials of the graphite stirring rod, the graphite stirring rod can become soft when reaching a certain temperature, and once part of the filler sinks, the graphite stirring rod can sink along with the filler, so that the roasted graphite stirring rod is bent, the later processing and use are greatly influenced, the specification required by a customer is difficult to process, and the problems of small furnace loading amount, uneven furnace loading position and the like can also occur. Once the bending occurs, a large amount of bending occurs, so that the whole process of the forming process is hard and expensive, and great economic loss is caused.
The Chinese patent with application number 201410017514.8 provides a preparation method of an oilless bearing graphite rod, which comprises arranging and sealing rod-shaped graphite blanks in a down-draft kiln, and simultaneously regulating a heating mechanism for roasting. The patent does not disclose a specific arrangement of the rod-like graphite blanks, and may not avoid the problem of bending of the rod-like blanks after roasting.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a graphite stirring rod and a roasting method thereof, which adopt a mode of placing the graphite stirring rod in a roasting furnace in a way that the axis of the graphite stirring rod forms a certain included angle with the gravity direction, solve the problems of bending and small yield and long roasting period of the stirring rod during roasting, and simultaneously improve the thermal expansion coefficient and the bending strength of the stirring rod.
In order to achieve the purpose, the invention specifically adopts the following technical scheme:
the graphite stirring rod has the volume density of 1.751-1.782 g/cm3Coefficient of thermal expansion of 2.5X 10-6～2.8×10-6The flexural strength is 13.28-14.92 MPa at/° C.
In the scheme, the graphite stirring rod is placed in an approximately vertical mode and is roasted, so that a product is heated uniformly during roasting, the density distribution is more uniform, and the product has good thermal expansion coefficient and breaking strength.
The further scheme of the invention is as follows: the graphite stirring rod is arranged in a metal grid in a roasting furnace and is roasted in a direction perpendicular to the gravity direction, the axis of the graphite stirring rod is parallel to or intersected with the axis of the metal grid, and the area ratio of any radial section of the graphite stirring rod to any radial section of the metal grid is 2-3.2: 9-16.
According to the scheme, the plurality of metal lattices are designed according to the size of the roasting furnace and the size of the graphite stirring rod, each metal lattice is arranged in the roasting furnace in a direction perpendicular to the gravity direction, the filling material is paved at the bottom of each metal lattice, so that a space perpendicular to the plane of the filling material is formed by each metal lattice, the graphite stirring rod can be placed in the space along the axial direction, the vertical installation of the graphite stirring rod in the roasting furnace is formed, and various problems caused by horizontal installation are prevented. The ratio of any radial section of the graphite stirring rod to any radial section of the metal lattice is a fixed value in the range, namely the graphite stirring rod and the metal lattice both have uniform radial section areas.
The further scheme of the invention is as follows: the ratio of the axial length to the radial diameter of the graphite stirring rod is 4-5: 9-10.
In the scheme, the graphite stirring rod corresponds to the metal grid, and the graphite stirring rod is required to have a certain size proportion to prevent insufficient heating because a gap is formed between the graphite stirring rod and the metal grid and used for filling the filler, and the filler plays a most important heat transfer role in the roasting process.
The invention also provides a roasting method of the graphite stirring rod, which comprises the steps of paving and tamping the filling material at the bottom of the roasting furnace, arranging metal grids parallel to the gravity direction on the filling material, enabling the axis of the graphite stirring rod to form a certain included angle with the gravity direction and be placed in the metal grids, filling and tamping the gaps between the graphite stirring rod and the metal grids by using the filling material, and roasting according to a roasting process curve.
In the method, different from the method of horizontally arranging a layer of graphite stirring rod and simultaneously laying a layer of filler in the prior art, after the filler is adopted for laying the bottom, the metal lattice is taken as a framework, the graphite stirring rod is placed in the metal lattice, and the filler is used for filling gaps, so that the graphite stirring rod realizes vertical furnace charging. The metal grids are preferably stainless steel grids, so that the recycling frequency of the metal grids can be greatly improved.
According to the method, the included angle between the axis of the graphite stirring rod and the gravity direction is 0-15 degrees, and preferably 0 degree.
In the method, when the graphite stirring rod has an included angle with the gravity direction at a certain angle, the height of the metal lattice and the laying thickness of the filling material can be properly reduced on the premise of not bending the product, and further, the graphite stirring rod has a certain angle deviation with the vertical direction, so that the laying number of the graphite stirring rod can be increased in a limited space, and the yield is improved. When the axis of the graphite stirring rod is arranged in parallel to the gravity direction, the best roasting effect is achieved, and the breaking strength of the final graphite product is improved.
According to the method, when the filling material is used for filling the gap between the graphite stirring rod and the metal grid, the angle between the axis of the graphite stirring rod and the gravity direction is observed and corrected at any time, and the observation and correction are stopped when the ratio of the height of the filling material to the height of the graphite stirring rod reaches 2: 5.
In the method, in the filling process of the filler, the angle between the axis of the graphite stirring rod and the gravity direction may be changed due to the gravity and the impact force generated by the collision of the filler and the inner wall of the metal grid, so that the performance of the roasted graphite stirring rod is influenced, and the angle is observed and corrected in the filling process until the graphite stirring rod is stably arranged in the metal grid.
According to the method, after observation and correction of the angle between the axis of the graphite stirring rod and the gravity direction are stopped, filling the filling material, and tamping once when the filling material rises to a certain height until the filling material covers the graphite stirring rod completely, wherein the ratio of the certain height to the unfilled height of the stirring rod is 1-2: 3-5.
In the method, because the axis of the graphite stirring rod and the gravity direction are arranged in the metal lattice at a certain included angle, in order to further strengthen the placement stability of the graphite stirring rod in the filling material, a plurality of times of tamping processes are added in the rest filling process, and the rising amplitude of the height of the filling material is taken as a node of tamping operation, so that the graphite stirring rod is stably arranged in the filling material to realize vertical furnace charging.
According to the method, the ratio of the height of the graphite stirring rod to the thickness of the furnace bottom filler is 3-4: 8-10.
According to the method, the filler can be paved on the top of the metal grid after filling the gap and tamping, and the metal grid is continuously added on the top of the filler for placing the graphite stirring rod to be roasted.
In the method, a plurality of layers of metal grids can be arranged according to the height of the roasting furnace, and the filling material with a certain thickness is laid between each layer of metal grids, so that each layer of metal grids and the graphite stirring rod arranged in each layer of metal grids are stably and vertically placed in the roasting process.
According to the method, the filler comprises metallurgical coke and quartz sand, and the weight ratio of the metallurgical coke to the quartz sand is 7: 3.
In the method, the granularity of the filler is not more than 5mm, wherein the metallurgical coke is used for heat transfer, and the quartz sand is used as the aggregate to play roles of shaping and supporting
According to the method, the roasting process curve is as follows:
in the method, because the graphite stirring rod is placed in an approximately vertical mode, the roasting process curve can be adjusted accordingly, the roasting purpose can be achieved in a shorter time, and the product has better performance.
If the vertical type placement roasting is not adopted, the roasting curve needs to be adjusted as follows:
| temperature step (. degree.C.) | Rate of temperature rise (. degree. C./h) | Stage time (h) | Cumulative time (h) |
| 130-300 | 3 | 57 | 57 |
| 300-370 | 2.3 | 30 | 87 |
| 370-410 | 1.4 | 29 | 116 |
| 410-520 | 0.9 | 122 | 238 |
| 520-620 | 1 | 100 | 338 |
| 620-730 | 1.1 | 100 | 438 |
| 730-850 | 1.2 | 100 | 538 |
| 850-950 | 1.5 | 67 | 605 |
| 950-1050 | 2.2 | 45 | 650 |
| 1050 | 0 | 30 | 680 |
As can be seen from the above table, the roasting curve adopted in the traditional process is longer in time consumption, and the energy consumption of production is improved.
The roasting method of the graphite stirring rod provided by the invention specifically comprises the following steps:
1. paving a filling material at the bottom of the roasting furnace, wherein the filling material comprises metallurgical coke and quartz sand in a weight ratio of 7:3, and the ratio of the thickness of the filling material at the bottom of the furnace to the height of the graphite stirring rod to be roasted is 8-10: 3-4;
2. vertically arranging a plurality of metal grids on the laid filler, and enabling the axes of the metal grids to be parallel to the gravity direction;
3. placing a graphite stirring rod to be roasted in a metal grid, and enabling the axis of the graphite stirring rod to form a certain included angle with the gravity direction, wherein the included angle is 0-15 degrees;
4. filling the filling material into the gap between the graphite stirring rod and the metal grid, continuously observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction in the process, and stopping observing and correcting when the ratio of the height of the filling material to the height of the graphite stirring rod reaches 2: 5;
5. after observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction, tamping the filled filler once when the filled filler rises to a certain height until the graphite stirring rod is completely covered by the filler, wherein the ratio of the certain height to the unfilled height of the stirring rod is 1-2: 3-5;
6. filling gaps in the step 5, paving filling materials on the top of the tamped metal grids, continuously adding metal grids on the top of the filling materials for placing the graphite stirring rod to be roasted, and setting a plurality of layers of metal grids capable of vertically placing the graphite stirring rod according to the actual situation;
7. roasting the graphite stirring rod according to the following roasting process curve to obtain a graphite product:
| temperature step (. degree.C.) | Rate of temperature rise (. degree. C./h) | Stage time (h) | Cumulative time (h) |
| 130～330 | 2.6 | 76 | 76 |
| 330～400 | 1.3 | 54 | 130 |
| 400～500 | 1.1 | 91 | 221 |
| 500～600 | 1.25 | 80 | 301 |
| 600～700 | 1.5 | 67 | 368 |
| 700～850 | 2 | 75 | 443 |
| 850～1050 | 3.5 | 57 | 500 |
| 1050 | 0 | 30 | 530 |
Detailed Description
The following provides an embodiment of the roasting method of the graphite stirring rod of the present invention, and also includes a comparative example for discussing the performance parameters and the setting mode of the graphite stirring rod of the present invention.
Example 1
In this embodiment, the roasting method of the graphite stirring rod includes the following steps:
1. paving a filling material at the bottom of the roasting furnace, wherein the filling material comprises metallurgical coke and quartz sand in a weight ratio of 7:3, and the ratio of the thickness of the filling material at the bottom of the furnace to the height of the graphite stirring rod to be roasted is 10: 3;
2. vertically arranging a plurality of metal grids on the laid filler, and enabling the axes of the metal grids to be parallel to the gravity direction;
3. placing a graphite stirring rod to be roasted in a metal grid, and enabling the axis of the graphite stirring rod to form a certain included angle with the gravity direction, wherein the included angle is 10 degrees;
4. filling the filling material into the gap between the graphite stirring rod and the metal grid, continuously observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction in the process, and stopping observing and correcting when the ratio of the height of the filling material to the height of the graphite stirring rod reaches 2: 5;
5. after observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction, tamping the filled filler once when the filled filler rises to a certain height until the graphite stirring rod is completely covered by the filler, wherein the ratio of the certain height to the unfilled height of the stirring rod is 2: 5;
6. filling gaps in the step 5, paving filling materials on the top of the tamped metal grids, continuously adding metal grids on the top of the filling materials for placing a graphite stirring rod to be roasted, and arranging 2 layers of metal grids capable of vertically placing the graphite stirring rod;
7. roasting the graphite stirring rod according to the following roasting process curve to obtain a graphite product:
| temperature step (. degree.C.) | Rate of temperature rise (. degree. C./h) | Stage time (h) | Cumulative time (h) |
| 130～330 | 2.6 | 76 | 76 |
| 330～400 | 1.3 | 54 | 130 |
| 400～500 | 1.1 | 91 | 221 |
| 500～600 | 1.25 | 80 | 301 |
| 600～700 | 1.5 | 67 | 368 |
| 700～850 | 2 | 75 | 443 |
| 850～1050 | 3.5 | 57 | 500 |
| 1050 | 0 | 30 | 530 |
The volume density of the graphite stirring rod prepared in the embodiment is 1.754g/cm3Coefficient of thermal expansion of 2.8X 10-6The flexural strength was 13.28MPa at/° C.
Example 2
In this embodiment, the roasting method of the graphite stirring rod includes the following steps:
1. paving a filling material at the bottom of the roasting furnace, wherein the filling material comprises metallurgical coke and quartz sand in a weight ratio of 7:3, and the ratio of the thickness of the filling material at the bottom of the furnace to the height of the graphite stirring rod to be roasted is 10: 4;
2. vertically arranging a plurality of metal grids on the laid filler, and enabling the axes of the metal grids to be parallel to the gravity direction;
3. placing a graphite stirring rod to be roasted in a metal grid, and enabling the axis of the graphite stirring rod to form a certain included angle with the gravity direction, wherein the included angle is 0 degree, namely the graphite stirring rod is vertically arranged in the metal grid along the gravity direction;
4. filling the filling material into the gap between the graphite stirring rod and the metal grid, continuously observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction in the process, and stopping observing and correcting when the ratio of the height of the filling material to the height of the graphite stirring rod reaches 2: 5;
5. after observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction, tamping the filled filler once when the filled filler rises to a certain height until the graphite stirring rod is completely covered by the filler, wherein the ratio of the certain height to the unfilled height of the stirring rod is 1: 3;
6. filling gaps in the step 5, paving filling materials on the top of the tamped metal grids, continuously adding metal grids on the top of the filling materials for placing a graphite stirring rod to be roasted, and arranging 3 layers of metal grids capable of vertically placing the graphite stirring rod;
7. roasting the graphite stirring rod according to the following roasting process curve to obtain a graphite product:
| temperature step (. degree.C.) | Rate of temperature rise (. degree. C./h) | Stage time (h) | Cumulative time (h) |
| 130～330 | 2.6 | 76 | 76 |
| 330～400 | 1.3 | 54 | 130 |
| 400～500 | 1.1 | 91 | 221 |
| 500～600 | 1.25 | 80 | 301 |
| 600～700 | 1.5 | 67 | 368 |
| 700～850 | 2 | 75 | 443 |
| 850～1050 | 3.5 | 57 | 500 |
| 1050 | 0 | 30 | 530 |
The volume density of the graphite stirring rod prepared in the embodiment is 1.782g/cm3Coefficient of thermal expansion of 2.5X 10-6The flexural strength was 14.92MPa at/° C.
Example 3
In this embodiment, the roasting method of the graphite stirring rod includes the following steps:
1. paving a filling material at the bottom of the roasting furnace, wherein the filling material comprises metallurgical coke and quartz sand in a weight ratio of 7:3, and the ratio of the thickness of the filling material at the bottom of the furnace to the height of the graphite stirring rod to be roasted is 8: 3;
2. vertically arranging a plurality of metal grids on the laid filler, and enabling the axes of the metal grids to be parallel to the gravity direction;
3. placing a graphite stirring rod to be roasted in a metal grid, and enabling the axis of the graphite stirring rod to form a certain included angle with the gravity direction, wherein the included angle is 15 degrees;
4. filling the filling material into the gap between the graphite stirring rod and the metal grid, continuously observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction in the process, and stopping observing and correcting when the ratio of the height of the filling material to the height of the graphite stirring rod reaches 2: 5;
5. after observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction, tamping the filled filler once when the filled filler rises to a certain height until the graphite stirring rod is completely covered by the filler, wherein the ratio of the certain height to the unfilled height of the stirring rod is 2: 4;
6. filling gaps in the step 5, paving filling materials on the top of the tamped metal grids, continuously adding metal grids on the top of the filling materials for placing a graphite stirring rod to be roasted, and arranging 4 layers of metal grids capable of vertically placing the graphite stirring rod;
7. roasting the graphite stirring rod according to the following roasting process curve to obtain a graphite product:
the graphite stirring rod prepared in this example had a bulk density of 1.751g/cm3Coefficient of thermal expansion of 2.6X 10-6The flexural strength was 13.42 MPa/deg.C.
Example 4
In this embodiment, the roasting method of the graphite stirring rod includes the following steps:
1. paving a filling material at the bottom of the roasting furnace, wherein the filling material comprises metallurgical coke and quartz sand in a weight ratio of 7:3, and the ratio of the thickness of the filling material at the bottom of the furnace to the height of the graphite stirring rod to be roasted is 10: 4;
2. vertically arranging a plurality of metal grids on the laid filler, and enabling the axes of the metal grids to be parallel to the gravity direction;
3. placing a graphite stirring rod to be roasted in a metal grid, and enabling the axis of the graphite stirring rod to form a certain included angle with the gravity direction, wherein the included angle is 0 degree, namely the graphite stirring rod is vertically arranged in the metal grid along the gravity direction;
4. filling the filling material into the gap between the graphite stirring rod and the metal grid, continuously observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction in the process, and stopping observing and correcting when the ratio of the height of the filling material to the height of the graphite stirring rod reaches 2: 5;
5. after observing and correcting the angle between the axis of the graphite stirring rod and the gravity direction, tamping the filled filler once when the filled filler rises to a certain height until the graphite stirring rod is completely covered by the filler, wherein the ratio of the certain height to the unfilled height of the stirring rod is 1: 5;
6. filling gaps in the step 5, paving filling materials on the top of the tamped metal grids, continuously adding metal grids on the top of the filling materials for placing a graphite stirring rod to be roasted, and arranging 3 layers of metal grids capable of vertically placing the graphite stirring rod;
7. roasting the graphite stirring rod according to the following roasting process curve to obtain a graphite product:
| temperature step (. degree.C.) | Rate of temperature rise (. degree. C./h) | Stage time (h) | Cumulative time (h) |
| 130～330 | 2.6 | 76 | 76 |
| 330～400 | 1.3 | 54 | 130 |
| 400～500 | 1.1 | 91 | 221 |
| 500～600 | 1.25 | 80 | 301 |
| 600～700 | 1.5 | 67 | 368 |
| 700～850 | 2 | 75 | 443 |
| 850～1050 | 3.5 | 57 | 500 |
| 1050 | 0 | 30 | 530 |
The volume density of the graphite stirring rod prepared in the example is 1.779g/cm3Coefficient of thermal expansion of 2.5X 10-6The flexural strength was 14.32MPa at/° C.
Comparative example 1
On the basis of the embodiment 2, the included angle between the placing angle of the graphite stirring rod and the gravity direction is adjusted to be 15-30 degrees during roasting, and other implementation modes are the same as the embodiment 2. The graphite stirring rod prepared in this example had a bulk density of 1.692g/cm3Coefficient of thermal expansion of 3.0X 10-6The flexural strength was 11.86MPa at/° C.
Comparative example 2
In addition to example 2, the graphite stirring rod and the metal compartment were filled with the electric resistance material during firing and then were not tamped, and other embodiments are the same as example 2. The volume density of the graphite stirring rod prepared in the embodiment is 1.631g/cm3Coefficient of thermal expansion of 3.2X 10-6The flexural strength was 11.31MPa at/° C.
Comparative example 3
In addition to example 2, the graphite stirring rod was directly placed upright in the baking furnace without using a metal grid and baked, and the other embodiment was the same as example 2. The graphite stirring rod prepared in this example had a bulk density of 1.743g/cm3Coefficient of thermal expansion of 2.8X 10-6V DEG C, the breaking strength is 12.99MPa, the yield is lower than 95 percent, and the main quality problem of the product is that bending is generatedOr a phenomenon of fracture.
Comparative example 4
On the basis of the embodiment 2, the thickness of the bottom layer filling material is reduced, the ratio of the thickness of the bottom layer filling material to the height of the graphite stirring rod to be roasted is 1:2, and other implementation modes are the same as the embodiment 2. The graphite stirring rod prepared in this example had a bulk density of 1.731g/cm3Coefficient of thermal expansion of 2.9X 10-6The yield is lower than 95% when the rupture strength is 12.87MPa, and the main quality problem of the product is the generation of cracks.
Experimental example 1
The graphite products of examples 1 to 4 and comparative examples 1 to 4 were measured for bulk density, thermal expansion coefficient and flexural strength, and the results are shown in table 1:
TABLE 1 relevant parameters for graphite articles made in examples 1-5 and comparative examples 1-4
As can be seen from Table 1, in examples 1 to 4, the angle between the graphite stirring rod blank and the vertical direction was adjusted, the thickness of the furnace bottom material was adjusted according to the length of the graphite stirring rod, and the volume density of the graphite stirring rod after vertical placement and calcination was 1.751 to 1.782g/cm3Coefficient of thermal expansion of 2.5X 10-6～2.8×10-6The bending strength is 13.28-14.92 MPa, and the performance parameters of the embodiment 2 and the embodiment 4 are better than those of the embodiment 1 and the embodiment 3, and the reason is that the included angle between the graphite stirring rod blank and the vertical direction is adjusted to be zero degree during roasting, namely the graphite stirring rod blank is roasted perpendicular to the horizontal plane, so that the product is prevented from bending due to uneven stress, and the performance of the product is improved, and in addition, the product performance of the embodiment 2 is slightly higher than that of the embodiment 4, because the embodiment 2 is more than the embodiment 4 in the tamping times.
Further, the angle between the graphite stirring rod blank and the vertical direction is adjusted to be 15-30 degrees in the comparative example 1, so that the angle exceeds the range limited by the application, the inclined graphite stirring rod blank is extruded unevenly when being filled with the filler, the volume density of the product is reduced, and the thermal expansion coefficient and the flexural strength are affected. In the comparative example 2, the filler is not tamped, so that the graphite stirring rod blank in the metal lattice is not easy to stabilize the angle between the graphite stirring rod blank and the vertical direction due to the large gap of the filler in the roasting process, and the performance of the roasted product is reduced compared with that of the example 2.
Further, in the comparative example 3, the metal grids are removed, so that the vertical roasting of the graphite stirring rods lacks auxiliary support, the included angle between the graphite stirring rods and the vertical direction is not easy to maintain in the process of filling the filler, a plurality of graphite stirring rods are easy to contact with each other, even the graphite stirring rods are kept to contact with each other in the roasting process, although the performance of the final product is not obviously reduced compared with that of the embodiment 2, the yield is reduced. The comparative example 4 is that the thickness of the furnace bottom material is reduced, so that the graphite stirring rod is unstable in standing in the filler, the heat transfer is further influenced, the heating is uneven, and finally, the product is cracked.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A roasting method of a graphite stirring rod is characterized by comprising the steps of laying and tamping a filling material at the bottom of a roasting furnace, arranging metal grids parallel to the gravity direction on the filling material, roasting the graphite stirring rod in the metal grids, enabling the axis of the graphite stirring rod to be parallel to or cross with the axis of the metal grids, enabling the ratio of the area of any radial section of the graphite stirring rod to the area of any radial section of the metal grids to be 2-3.2: 9-16, enabling the included angle between the axis of the graphite stirring rod and the gravity direction to be 0-15 degrees, filling and tamping gaps between the graphite stirring rod and the metal grids by using the filling material, and roasting according to a roasting process curve; the ratio of the height of the graphite stirring rod to the thickness of the furnace bottom filler is 3-4: 8-10;
the roasting process curve comprises the following steps: raising the temperature at the speed of 2.6 ℃/h for 76h to raise the roasting temperature from 130 ℃ to 330 ℃, raising the roasting temperature at the speed of 1.3 ℃/h for 54h to raise the roasting temperature from 330 ℃ to 400 ℃, raising the roasting temperature at the speed of 1.1 ℃/h for 91h to raise the roasting temperature from 400 ℃ to 500 ℃, raising the roasting temperature at the speed of 1.25 ℃/h for 80h to raise the roasting temperature from 500 ℃ to 600 ℃, raising the roasting temperature at the speed of 1.5 ℃/h for 67h to raise the roasting temperature from 600 ℃ to 700 ℃, raising the roasting temperature at the speed of 2 ℃/h for 75h to raise the roasting temperature from 700 ℃ to 850 ℃, raising the roasting temperature at the speed of 3.5 ℃/h for 57h to raise the roasting temperature from 850 ℃ to 1050 ℃, and finally preserving the temperature at 1050 ℃ for 30h and accumulating for 530 h.
2. The roasting method according to claim 1, wherein the angle between the axis of the graphite stirring rod and the gravity direction is 0 °.
3. The roasting method according to claim 1, wherein the angle between the axis of the graphite stirring rod and the gravity direction is observed and corrected at any time while filling the gap between the graphite stirring rod and the metal cell with the filler, and the observation and correction are stopped when the ratio of the height of the filler to the height of the graphite stirring rod reaches 2: 5.
4. The roasting method according to claim 3, wherein after the observation and the correction of the angle between the axis of the graphite stirring rod and the gravity direction are stopped, the filling material is tamped once every time the filling material rises by a certain height until the filling material covers the graphite stirring rod completely, and the ratio of the certain height to the unfilled height of the stirring rod is 1-2: 3-5.
5. The firing method as claimed in claim 4, wherein the filler includes metallurgical coke and quartz sand, and the weight ratio of the metallurgical coke to the quartz sand is 7: 3.
6. A graphite stirring rod, which is characterized in that the graphite stirring rod is prepared by the roasting method of the graphite stirring rod as claimed in any one of claims 1 to 5, and the volume density of the graphite stirring rod is 1.751 to 1.782g/cm3Coefficient of thermal expansion of 2.5X 10-6～2.8×10-6The bending strength is 13.28-14.92 MPa, and the ratio of the axial length to the radial diameter of the graphite stirring rod is 4-5: 9-10.
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| CN1605657A (en) * | 2003-10-10 | 2005-04-13 | 中国铝业股份有限公司 | Roasting method for aluminum electrolytic charcoal anode |
| CN104219811A (en) * | 2013-06-05 | 2014-12-17 | 株洲火炬工业炉有限责任公司 | Composite graphite electrode and manufacturing method thereof |
| CN105237006A (en) * | 2015-10-20 | 2016-01-13 | 大同新成新材料股份有限公司 | Method for preparing graphite furnace lining for submerged arc furnace |
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| CN102060293B (en) * | 2010-11-16 | 2012-07-25 | 中钢集团吉林炭素股份有限公司 | Method for preparing binder-free graphite product |
| CN102135380B (en) * | 2011-03-10 | 2012-10-31 | 伊川龙海科技实业有限公司 | Vertical charging method for roasting carbon blocks and charging die thereof |
| CN103771404B (en) * | 2014-01-15 | 2016-04-20 | 湖南省长宇新型炭材料有限公司 | A kind of preparation method of oilless bearing graphite rod |
| CN104477890A (en) * | 2014-12-05 | 2015-04-01 | 大同新成新材料股份有限公司 | One-time roasting method for isostatic graphite product |
| CN106007716A (en) * | 2016-05-19 | 2016-10-12 | 大同新成新材料股份有限公司 | One-time calcination charging method for artificial graphite |
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| CN1605657A (en) * | 2003-10-10 | 2005-04-13 | 中国铝业股份有限公司 | Roasting method for aluminum electrolytic charcoal anode |
| CN104219811A (en) * | 2013-06-05 | 2014-12-17 | 株洲火炬工业炉有限责任公司 | Composite graphite electrode and manufacturing method thereof |
| CN105237006A (en) * | 2015-10-20 | 2016-01-13 | 大同新成新材料股份有限公司 | Method for preparing graphite furnace lining for submerged arc furnace |
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