CN108530078B - Forming method of large-size isostatic pressing graphite product - Google Patents
Forming method of large-size isostatic pressing graphite product Download PDFInfo
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- CN108530078B CN108530078B CN201810555031.1A CN201810555031A CN108530078B CN 108530078 B CN108530078 B CN 108530078B CN 201810555031 A CN201810555031 A CN 201810555031A CN 108530078 B CN108530078 B CN 108530078B
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
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Abstract
The invention discloses a method for molding a large-size isostatic pressing graphite product, which comprises the following steps: s1: crushing raw materials: selecting high-quality calcined petroleum coke and asphalt coke, and crushing to obtain a primary crushed raw material; s2: grinding raw materials: grinding the primary crushed raw material in the step S1 to obtain a powdery raw material; s3: weighing and proportioning raw materials: weighing the powdery raw materials in the S2, and mixing according to the proportion of 1:1 to obtain pre-mixed raw materials; s4: dry mixing of raw materials: the pre-formulated raw materials described in S3 were mixed at high temperature. The isostatic pressing product has the advantages that the two raw materials can be ensured to be in proper proportion through raw material crushing, grinding, weighing and batching, the two raw materials can be ensured to be fully mixed, the isostatic pressing product can be large in specification, high in density and uniform in internal structure through dry mixing and wet mixing of the raw materials, a hot roller and roasting, the quality of the isostatic pressing product is greatly improved, the production cost can be reduced, and the requirement of modern production is met.
Description
Technical Field
The invention relates to the technical field of isostatic pressing of graphite products, in particular to a method for forming a large-size isostatic pressing graphite product.
Background
The isostatic pressing graphite is formed by pressing high-purity graphite. Isostatic pressing graphite is a new product developed in the last 50 years internationally and is closely linked with the high technology of the present day. The material is not only widely used for civil use, but also plays an important role in the national defense, belongs to a novel material and is attractive. It is an irreplaceable material for manufacturing single crystal furnaces, metal continuous casting graphite crystallizers, graphite electrodes for electric spark processing and the like, and is an excellent material for manufacturing rocket nozzles, speed reducing materials and reflecting materials of graphite reactors.
Through search, patent document CN104529450B discloses a method for forming large-size isostatic pressing graphite, which comprises: grinding needle coke, calcined petroleum coke, asphalt coke, carbon black and natural graphite serving as raw materials into powder, dry-mixing the powder to obtain a mixture A, and wet-mixing modified asphalt, oleic acid and the mixture A at the temperature of 160-180 ℃ to obtain a mixture B; discharging the mixture B, rolling the mixture B, and roasting the rolled mixture B at the roasting temperature of not less than 1000 ℃; grinding the roasted rolled sheet; wet mixing the obtained powder A, the modified asphalt and oleic acid at the temperature of 180-220 ℃ to obtain a mixture C; discharging the mixture C under the condition of keeping the temperature of 160-180 ℃, rolling sheets, and grinding the mixture C after cooling; and mixing the obtained powder B at the temperature of 50-70 ℃, bagging and carrying out isostatic pressing. The isostatic pressing product prepared by the method has large specification, high density and uniform internal structure, and lays a good foundation for the roasting process of the isostatic pressing product, but the method has more complicated steps and higher production cost, and is not suitable for modern production.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for forming a large-size isostatic pressing graphite product.
The invention provides a method for forming a large-size isostatic pressing graphite product, which comprises the following steps:
s1: crushing raw materials: selecting high-quality calcined petroleum coke and asphalt coke, and crushing to obtain a primary crushed raw material;
s2: grinding raw materials: grinding the primary crushed raw material in the step S1 to obtain a powdery raw material;
s3: weighing and proportioning raw materials: weighing the powdery raw materials in the S2, and mixing according to the proportion of 1:1 to obtain pre-mixed raw materials;
s4: dry mixing of raw materials: mixing the pre-prepared raw materials in the S3 at a high temperature to obtain dry mixed raw materials;
s5: wet mixing of raw materials: adding the dry mixed raw material in the S4 into modified asphalt for wet mixing to obtain a wet mixture;
s6: hot rolling and roasting: carrying out high-temperature rolling on the wet mixture in the S5 to obtain rolled sheets, and roasting the rolled sheets to obtain dried rolled sheets;
s7: cooling and grinding: cooling the dried rolled sheet in the step S6, and grinding the cooled rolled sheet to obtain a powdery pre-forming raw material;
s8: pre-pressing and forming: bagging the powdery preforming raw material in the S7, and waiting for depressurization and forming.
Preferably, in the step S1, the selected high-quality calcined petroleum coke and the selected high-quality pitch coke are respectively crushed in two jaw crushers for 2-3 hours.
Preferably, in S2, place two kinds of first-break raw materials in two 4R milling machines respectively and grind, grind for a long time and be 2 ~ 3h to discharge gate play at two 4R milling machines sets up the screen cloth, utilizes the screen cloth to screen the likepowder raw materials after grinding.
Preferably, in S3, the two powdered raw materials are weighed by two electronic scales respectively, and are mixed by a mixing hopper according to a ratio of 1: 1.
Preferably, in the step S4, the pre-prepared raw materials are mixed in a 1000L electric heating intensive mixer for heating kerosene, and the mixing time is 1-2 h.
Preferably, in S5, pure water is added to the electric heating strong mixer, and the dry mixed raw materials are mixed by controlling the mixing cabin of the electric heating strong mixer at 160-180 ℃.
Preferably, in S6, the wet mixture is introduced into a hot rolling mill by a belt to roll, and the rolled sheet after rolling is baked at a baking temperature of 1000 to 1200 ℃.
Preferably, in S7, the baked rolled sheet is placed in an automatic cooler for cooling, and the rolled sheet is cooled to room temperature.
Preferably, in the step S7, the cooled rolled sheet is placed in a 4R mill for grinding for 2-3 hours.
Preferably, in the step S8, the powdery pre-forming raw material is quantitatively packaged in a bag, and then is placed in an isostatic press for press forming, wherein the pressure of the isostatic press is controlled to be 120 to 150MPa, and the static pressure duration is 15 to 20 min.
The invention has the beneficial effects that: through raw materials crushing, crocus, weigh and batching can guarantee that two kinds of raw materials proportion is suitable, and can guarantee two kinds of raw materials intensive mixing, dry mix through the raw materials, raw materials wet mix can make, hot roll and calcination can make isostatic pressing article specification big, density is high, and inner structure is even, improves the quality of isostatic pressing article such as greatly, and can reduction in production cost, satisfies the demand of modernized production.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Examples
The embodiment provides a method for forming a large-size isostatic pressing graphite product, which comprises the following steps:
s1: crushing raw materials: selecting high-quality calcined petroleum coke and asphalt coke, and crushing to obtain a primary crushed raw material;
s2: grinding raw materials: grinding the primary crushed raw material in the step S1 to obtain a powdery raw material;
s3: weighing and proportioning raw materials: weighing the powdery raw materials in the S2, and mixing according to the proportion of 1:1 to obtain pre-mixed raw materials;
s4: dry mixing of raw materials: mixing the pre-prepared raw materials in the S3 at a high temperature to obtain dry mixed raw materials;
s5: wet mixing of raw materials: adding the dried mixed raw material in the S4 into the modified asphalt for wet mixing to obtain a wet mixture;
s6: hot rolling and roasting: carrying out high-temperature rolling on the wet mixture in the S5 to obtain rolled sheets, and roasting the rolled sheets to obtain dried rolled sheets;
s7: cooling and grinding: cooling the dried rolled sheet in the step S6, and grinding the cooled rolled sheet to obtain a powdery pre-forming raw material;
s8: pre-pressing and forming: and (5) bagging the powdery preforming raw material in the S7, and waiting for depressurization and forming.
In the embodiment, in S1, selected high-quality calcined petroleum coke and pitch coke are respectively placed in two jaw crushers to be crushed for 2-3 hours, in S2, two primary crushed raw materials are respectively placed in two 4R mills to be ground for 2-3 hours, a screen is arranged at a discharge port of each 4R mill, the ground powdery raw materials are screened by the screen, in S3, two electronic scales are used for weighing the two powdery raw materials respectively, the two powdery raw materials are proportioned by a proportioning hopper according to the proportion of 1:1, in S4, the pre-proportioned raw materials are placed in a 1000L electric heating strong mixing machine for heating kerosene to be mixed for 1-2 hours, in S5, the electric heating strong mixing machine is added, and a mixing cabin of the electric heating strong mixing machine is controlled at 160-180 ℃ to mix dry mixed raw materials, s6, guiding the wet mixture into a hot rolling mill by using a belt to roll, roasting the rolled sheet after the roll, controlling the roasting temperature to be 1000-1200 ℃, S7, cooling the roasted rolled sheet in an automatic cooler to cool the rolled sheet to room temperature, S7, grinding the cooled rolled sheet in a 4R grinding mill for 2-3 h, S8, quantitatively filling the powdery pre-forming raw materials into a bag, then putting the bag into an isostatic press for compression molding, controlling the pressure of the isostatic press to be 120-150 MPa, controlling the hydrostatic press to be 15-20 min, ensuring the two raw materials to be in proper proportion by crushing, grinding, weighing and batching the raw materials, fully mixing the two raw materials, enabling the isostatic pressed product to be large in specification, high in density and uniform in internal structure by dry mixing and wet mixing of the raw materials, and greatly improving the quality of the isostatic pressed product, and the production cost can be reduced, and the requirement of modern production is met.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A method for forming a large-size isostatic pressing graphite product is characterized by comprising the following steps:
s1: crushing raw materials: selecting high-quality calcined petroleum coke and asphalt coke, and crushing to obtain a primary crushed raw material;
s2: grinding raw materials: grinding the primary crushed raw material in the step S1 to obtain a powdery raw material;
respectively placing the two primary-crushed raw materials into two 4R powder mills for grinding, wherein the grinding time is 2-3 h, arranging screen meshes at the discharge outlets of the two 4R powder mills, and screening the ground powdery raw materials by using the screen meshes;
s3: weighing and proportioning raw materials: weighing the powdery raw materials in the S2, and mixing according to the proportion of 1:1 to obtain pre-mixed raw materials;
s4: dry mixing of raw materials: mixing the pre-prepared raw materials in the S3 at a high temperature to obtain dry mixed raw materials;
s5: wet mixing of raw materials: adding the dry mixed raw material in the S4 into modified asphalt for wet mixing to obtain a wet mixture;
s6: hot rolling and roasting: carrying out high-temperature rolling on the wet mixture in the S5 to obtain rolled sheets, and roasting the rolled sheets to obtain dried rolled sheets;
guiding the wet mixture into a hot rolling mill by using a belt for rolling, and roasting rolled sheets after rolling, wherein the roasting temperature is controlled to be 1000-1200 ℃;
s7: cooling and grinding: cooling the dried rolled sheet in the step S6, and grinding the cooled rolled sheet to obtain a powdery pre-forming raw material;
s8: pre-pressing and forming: bagging the powdery pre-forming raw material in the step S7, and waiting for depressurization and forming;
in the step S4, the pre-prepared raw materials are placed in a 1000L electric heating intensive mixer for heating kerosene for mixing for 1-2 h;
in the step S5, adding pure water into the electric heating intensive mixer, and controlling a mixing cabin of the electric heating intensive mixer to be 160-180 ℃ to mix the dry mixed raw materials;
and S8, quantitatively packaging the powdery pre-forming raw materials into bags, and then putting the bags into an isostatic press for press forming, wherein the pressure of the isostatic press is controlled to be 120-150 MPa, and the static pressure duration is 15-20 min.
2. The method for forming the large-size isostatic-pressing graphite product according to claim 1, wherein in S1, the selected high-quality calcined petroleum coke and pitch coke are respectively crushed in two jaw crushers for 2-3 hours.
3. The method of claim 1, wherein in step S3, the two kinds of raw powders are weighed by two electronic scales, and the two kinds of raw powders are mixed at a ratio of 1:1 by a mixing hopper.
4. The method of claim 1, wherein in step S7, the fired sheet is cooled in an automatic cooler to cool the sheet to room temperature.
5. The method of claim 1, wherein in step S7, the cooled rolled sheet is ground in a 4R mill for 2-3 h.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109503169A (en) * | 2018-12-24 | 2019-03-22 | 成都阿泰克特种石墨有限公司 | A kind of special graphite and preparation method thereof |
| CN113831126A (en) * | 2021-09-17 | 2021-12-24 | 大同新成新材料股份有限公司 | Preparation method of isostatic pressing negative electrode carbon material |
| CN113896534A (en) * | 2021-09-29 | 2022-01-07 | 大同新成新材料股份有限公司 | Isostatic pressing graphite product with high compression strength and high breaking strength and forming method thereof |
| CN114349510A (en) * | 2022-01-14 | 2022-04-15 | 永安市鼎丰碳素科技有限公司 | Production process of isostatic pressing special graphite |
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|---|---|---|---|---|
| JP3381174B2 (en) * | 1991-06-10 | 2003-02-24 | 日本原子力研究所 | Graphite materials for nuclear reactors |
| CN103286850A (en) * | 2012-09-25 | 2013-09-11 | 江苏宏基炭素科技有限公司 | One-time forming method and special mold for graphite crucible |
| CN104529450A (en) * | 2014-12-04 | 2015-04-22 | 大同新成新材料股份有限公司 | Forming method of large-sized isostatic pressing formed graphite product |
| CN105819858A (en) * | 2016-05-19 | 2016-08-03 | 大同新成新材料股份有限公司 | Preparation method of pantograph carbon slider |
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2018
- 2018-06-01 CN CN201810555031.1A patent/CN108530078B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3381174B2 (en) * | 1991-06-10 | 2003-02-24 | 日本原子力研究所 | Graphite materials for nuclear reactors |
| CN103286850A (en) * | 2012-09-25 | 2013-09-11 | 江苏宏基炭素科技有限公司 | One-time forming method and special mold for graphite crucible |
| CN104529450A (en) * | 2014-12-04 | 2015-04-22 | 大同新成新材料股份有限公司 | Forming method of large-sized isostatic pressing formed graphite product |
| CN105819858A (en) * | 2016-05-19 | 2016-08-03 | 大同新成新材料股份有限公司 | Preparation method of pantograph carbon slider |
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