Production process of graphitized crucible

Abstract

The invention relates to the technical field of crucible production, in particular to a production process of a graphitized crucible, and solves the problems of high energy consumption, serious environmental pollution, low raw material utilization rate, insufficient product performance and the like in the prior art. By adopting the mode of annular heat conduction oil heating and water cooling, the mixing and kneading effect is ensured, meanwhile, energy waste is reduced, in the roasting process, accurate control over the temperature is achieved by controlling the power supply voltage, and therefore the roasting efficiency is improved, and energy consumption is reduced; the invention also particularly emphasizes the collection and purification treatment of roasting flue gas, and ensures the environmental protection of the production process. The production efficiency and the product quality are improved, the purposes of energy conservation, emission reduction and environmental protection are achieved, and a more advanced and sustainable solution is provided for production of graphitized crucibles.

Description

Technical Field

[0001] The invention relates to the technical field of crucible production, and in particular to a production process of a graphitized crucible. Background Art

[0002] Graphite crucible, also known as copper melting bag, copper melting, etc., refers to a type of crucible made of graphite, clay, silica and wax stone. Graphite crucible is mainly used to smelt non-ferrous metals and their alloys such as copper, brass, gold, silver, zinc and lead.

[0003] Graphite crucibles are resistant to high temperatures, have strong thermal conductivity, good corrosion resistance, and long service life. During high-temperature use, the thermal expansion coefficient is small, and it has a certain resistance to strain in the case of rapid cooling and rapid heating. It has strong corrosion resistance to acidic and alkaline solutions, has excellent chemical stability, and does not participate in any chemical reaction during the smelting process. The inner wall of the graphite crucible is smooth, and the molten metal liquid is not easy to leak and adhere to the inner wall of the crucible, so that the metal liquid has good fluidity and castability, and is suitable for casting and molding in various molds.

[0004] In the prior art, graphitized petroleum coke, a byproduct of producing negative electrode materials, can usually only be sold as a recarburizer, and its application scope is limited and the economic benefits are not high. Summary of the invention

[0005] The present invention provides a production process for graphitized crucibles, which uses graphitized petroleum coke and asphalt, byproducts of the production of negative electrode materials, as raw materials, solving the problem of limited application range of graphitized petroleum coke in the prior art. It not only improves production efficiency and product quality, but also achieves remarkable results in energy saving, consumption reduction and environmental protection, providing a more efficient, environmentally friendly and economical solution.

[0006] The technical solution adopted by the present invention is: a production process of a graphitized crucible, comprising the following steps:

[0007] Step 1, screening and batching: Screen the raw materials to obtain graphitized petroleum coke and binder medium-temperature reformed asphalt that meet the requirements, control the batching ratio, use conveyors for batching, and strengthen production environment management to control unorganized emissions and meet the requirements of clean production source control;

[0008] Step 2, kneading: the screened graphitized petroleum coke and the binder medium-temperature reformed asphalt are fed into the kneader, and a pair of blades of the kneader cooperate with each other and rotate to produce a strong shearing effect, so that the semi-dry thick material is quickly and evenly mixed. During the kneading process, the heating temperature is 120°C, the ring heat transfer oil heating method is adopted, and the cooling method is water cooling to ensure the kneading effect. After the kneading is completed, the kneading cylinder cover is covered for closed kneading to obtain a uniform paste;

[0009] Step 3, press cooling: the kneaded paste is discharged into the cooling tank of the hydraulic molding machine through the discharge pipe, and the paste is cooled to the softening process temperature of 80°C by the cooling water coil around the cooling tank. Subsequently, the cooled paste is loaded into the press by spiral extrusion, and the hydraulic molding machine is used for pressing to form a molded crucible. After the pressing is completed, cooling water is introduced into the mold for further cooling to form a solid crucible, and then the mold is withdrawn to obtain a molded crucible product;

[0010] Step 4, roasting: the formed crucible and the filler are sent into the ring furnace for roasting. During the loading process, the filler is loaded into the crucible by negative pressure suction, and the crucible with the filler, the resistor material and the insulation material are loaded into the furnace in layers by the crane. During the roasting process, the power supply voltage is controlled to increase the roasting temperature according to a certain temperature rise curve. After reaching 1300°C, the power supply is stopped to complete the roasting process. The flue gas generated by the roasting is collected through the negative pressure collection channel on the top floor of the furnace, and is discharged after being treated by the double alkali desulfurization bag filter;

[0011] Step 5, machining: After the crucible is naturally cooled after being roasted, it is ground, shaped and rounded by a grinder, lathe or boring machine to obtain the final graphitized crucible product.

[0012] As a further improvement of the present invention, the graphitized petroleum coke is mainly a by-product of the production of negative electrode materials. During the screening process, the graphitized petroleum coke is sent to a linear screening machine for screening treatment, wherein the graphitized petroleum coke with a particle size greater than 6 mm is lifted by a crane to a Raymond mill for grinding treatment, and the raw materials after grinding treatment are sent to a kneader through a screw conveyor.

[0013] As a further improvement of the present invention, the binder is medium-temperature reformed asphalt, which plays a key bonding role in the kneading process, ensuring uniform mixing of graphitized petroleum coke and asphalt, thereby improving the structural strength and heat resistance of the crucible.

[0014] As a further improvement of the present invention, the kneading machine is heated by heat transfer oil, which can fully utilize the waste heat from the production of calcined petroleum coke without the need for supporting heating equipment, thus meeting the clean production requirements of waste heat utilization, energy saving and consumption reduction.

[0015] As a further improvement of the present invention, asphalt fumes are collected by arranging a collection pipe in the asphalt tank and a gas collecting hood on the top of the kneading machine, and the collected waste gas is purified by an electric tar precipitator purification device.

[0016] As a further improvement of the present invention, the process flow of the roasting is as follows:

[0017] S1: The raw materials used in the crucible loading process are forming crucibles and filling materials. The forming crucibles are transported from the forming fork to the roasting workshop. The crucible loading process is carried out in the roasting workshop. Two sets of negative pressure suction crucible systems are set up. The crucibles are loaded by negative pressure suction, and the metallurgical coke is loaded into the crucibles;

[0018] S2: The crucibles filled with fillers are loaded into the ring furnace by a crane. The loading process is divided into three layers. The crucible spacing is 50mm. 0-4mm particle size calcined petroleum coke is filled between the crucibles as insulation material, and 4-6mm particle size calcined petroleum coke is filled outside the resistor material as resistor material.

[0019] S3: After the furnace is loaded, the furnace cover is added, and the power supply system is started to supply power. The crucible and the resistor material in the furnace are heated under the action of the current, and the temperature gradually rises. By controlling the power supply voltage, the roasting temperature is raised according to a certain temperature rise curve. When the temperature reaches 1300°C, the power supply is stopped to complete the roasting process;

[0020] S4: After the roasting is completed, the charge is cooled down naturally, and the furnace operates alternately. When cooling down, the material is cooled down gradually from the outside to the inside. When the temperature of the furnace top insulation material and the resistor material drops to 60°C, the furnace cover is opened, and the furnace top insulation material and the resistor material are shoveled out of the furnace through a special grab bucket by the crane to expose the crucible layer. After the crucible layer is completely cooled, the crucible is taken out by the crane, and then the second and third layers of crucibles are cleaned in turn.

[0021] As a further improvement of the present invention, the insulation material and the resistor material are transported from the finished product silo in the calcining workshop to the roasting workshop by a forklift in ton bags. When loading the furnace, firstly, a layer of steel plate is loaded at the boundary position of the resistor material and the insulation material, and then the crucible is lifted by a crane to load the first layer, and then the ton bag of resistor material is directly lifted by the crane, and a layer of resistor material is loaded within the range of the steel plate, and then the second and third layers are loaded in the same way. After the crucible and the resistor material are loaded into the furnace, the insulation material is loaded between the steel plate and the furnace wall in the same way.

[0022] As a further improvement of the present invention, the roasting flue gas generated in the roasting process is collected through a negative pressure collection channel on the top layer of the furnace, an ignition device is arranged in the channel to ignite and burn volatiles, and the flue gas is then discharged after double alkali desulfurization bag dust removal.

[0023] As a further improvement of the present invention, the cleared insulation material and resistor material are shoveled and transported to the raw material temporary storage room in the workshop by a crane grab bucket for temporary storage and reuse. The metallurgical coke in the crucible is sucked out by a negative pressure crucible unloading system and temporarily stored in a ton bag for reuse. The insulation material, resistor material and filling material can all be reused. There will be burnt loss during the burning process, mainly the escape of sulfur, volatile matter, moisture and the escape of carbon dioxide generated by carbon oxidation. New material is added to the part that is insufficient for burnt loss, and the roasted crucible is transported to the negative electrode material workshop by another vehicle for standby use.

[0024] The beneficial effects of the present invention are as follows: the present invention effectively reduces energy consumption in the production process, reduces production costs, improves production efficiency, reduces production links, and shortens production cycles; the present invention improves product quality and performance by optimizing the process flow, meets the high standards of industrial production for graphitized crucibles, and increases the service life of graphitized crucibles by 30%; the present invention realizes environmental protection of the production process, reduces pollution to the environment, and complies with national policy requirements for clean production; the present invention reduces waste of resources by recycling raw materials, and realizes a sustainable development production model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention discloses a system block diagram of a production process of a graphitized crucible. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] The present invention provides a production process for a graphitized crucible, which is characterized by comprising the following steps:

[0028] Step 1, screening and batching: Screen the raw materials to obtain graphitized petroleum coke and binder medium-temperature reformed asphalt that meet the requirements, control the batching ratio, use conveyors for batching, and strengthen production environment management to control unorganized emissions and meet the requirements of clean production source control.

[0029] The graphitized petroleum coke is mainly a by-product of the production of negative electrode materials. During the screening process, the graphitized petroleum coke is sent to a linear screening machine for screening treatment, wherein the graphitized petroleum coke with a particle size greater than 6 mm is hoisted by a crane to a Raymond mill for grinding treatment, and the raw materials after grinding treatment are sent to a kneading machine through a screw conveyor.

[0030] The binder is medium-temperature reformed asphalt, which plays a key bonding role in the kneading process, ensuring the uniform mixing of graphitized petroleum coke and asphalt, thereby improving the structural strength and heat resistance of the crucible.

[0031] Asphalt fumes are collected by setting a collection pipe in the asphalt tank and a gas collecting hood on the top of the kneading machine, and the collected waste gas is purified by an electric tar precipitator purification device;

[0032] Step 2, kneading: the screened graphitized petroleum coke and the binder medium-temperature reformed asphalt are fed into the kneader, and a pair of blades of the kneader cooperate with each other and rotate to produce a strong shearing effect, so that the semi-dry thick material is quickly and evenly mixed. During the kneading process, the heating temperature is 120°C, the ring heat transfer oil heating method is adopted, and the cooling method is water cooling to ensure the kneading effect. After the kneading is completed, the kneading cylinder cover is added for closed kneading to obtain a uniform paste.

[0033] The kneading machine is heated by heat-conducting oil, which can make full use of the waste heat from the production of calcined petroleum coke, without the need for supporting heating equipment, and meets the clean production requirements of waste heat utilization, energy saving and consumption reduction;

[0034] Step 3, press cooling: the kneaded paste is discharged into the cooling tank of the hydraulic molding machine through the discharge pipe, and the paste is cooled to the softening process temperature of 80°C by the cooling water coil around the cooling tank. Subsequently, the cooled paste is loaded into the press by spiral extrusion, and the hydraulic molding machine is used for pressing to form a molded crucible. After the pressing is completed, cooling water is introduced into the mold for further cooling to form a solid crucible, and then the mold is withdrawn to obtain a molded crucible product;

[0035] Step 4, roasting: send the formed crucible and the filling material into the ring furnace for roasting. During the loading process, the filling material is loaded into the crucible by negative pressure suction, and the crucible with the filling material, the resistor material and the insulation material are loaded into the furnace in layers by the crane. During the roasting process, the power supply voltage is controlled to make the roasting temperature rise according to a certain temperature rise curve. After reaching 1300℃, the power supply is stopped to complete the roasting process. The flue gas generated by the roasting is collected through the negative pressure collection channel on the top floor of the furnace, and discharged after being treated by the double alkali desulfurization bag filter.

[0036] The roasting process is as follows: S1, the raw materials used in the crucible loading process are a formed crucible and a filling material. The formed crucible is moved from a forming fork to a roasting workshop. The crucible loading process is carried out in the roasting workshop. Two sets of negative pressure suction crucible systems are provided. The crucible is loaded by a negative pressure suction method, and the metallurgical coke is loaded into the crucible; S2, the crucible loaded with the filling material is loaded into the ring furnace by a crane. The loading process is divided into three layers. The crucible spacing is 50mm. 0-4mm particle size calcined petroleum coke is filled between the crucibles as a heat preservation material, and 4-6mm particle size calcined petroleum coke is filled outside the resistance material as a resistance material; S3, after the furnace loading is completed, the furnace cover is covered, and the power supply system is started to supply power , the crucible and resistor material in the furnace generate heat under the action of the electric current, and the temperature gradually increases. By controlling the power supply voltage, the roasting temperature is raised according to a certain temperature rise curve. After the temperature reaches 1300°C, the power supply is stopped to complete the roasting process; S4, the charge after roasting is naturally cooled down, and the furnace operates alternately. When cooling down, the material is gradually cooled down from the outside to the inside. When the temperature of the furnace top insulation material and the resistor material drops to 60°C, the furnace cover is opened, and the furnace top insulation material and the resistor material are loaded out of the furnace through a special grab shovel by the crane to expose the crucible layer. After the crucible layer is completely cooled, the crucible is taken out by the crane, and then the second and third crucibles are cleaned in turn.

[0037] The insulation material and resistor material are transported from the finished product bin of the calcining workshop to the roasting workshop by a forklift. When loading the furnace, firstly, a layer of steel plate is loaded at the boundary of the resistor material and the insulation material, and then the first layer is loaded in the crucible by a crane, and then the resistor material bag is directly lifted by the crane, and a layer of resistor material is loaded within the steel plate range, and then the second and third layers are loaded in the same way. After the crucible and the resistor material are loaded into the furnace, the insulation material is loaded between the steel plate and the furnace wall in the same way.

[0038] The roasting flue gas generated in the roasting process is collected through the negative pressure collection channel on the top floor of the furnace. An ignition device is arranged in the channel to ignite and burn the volatile matter. The flue gas is then discharged after being desulfurized by a double alkali method bag dust collector.

[0039] The cleared insulation materials and resistor materials are shoveled and transported to the temporary storage room of raw materials in the workshop for reuse. The metallurgical coke in the crucible is sucked out by the negative pressure crucible unloading system and temporarily stored in the ton bag for reuse. The insulation materials, resistor materials and filling materials can be reused. There will be burnout during the burning process, mainly sulfur, volatile matter, water and carbon dioxide generated by carbon oxidation. New materials are added to the insufficient burnout part. The roasted crucible is transported to the negative electrode material workshop by another car for standby use.

[0040] Step 5, machining: After the crucible is naturally cooled after being roasted, it is ground, shaped and rounded by a grinder, lathe or boring machine to obtain the final graphitized crucible product.

[0041] Example:

[0042] This embodiment 1 describes the production process of a graphitized crucible, which specifically includes the following steps:

[0043] (I) Screening and batching: First, the raw materials are screened to obtain graphitized petroleum coke and binder medium-temperature reformed asphalt that meet the requirements. By controlling the batching ratio and using a conveyor for batching, while strengthening production environment management to control unorganized emissions, it meets the requirements of clean production source control. During the screening process of graphitized petroleum coke, the graphitized petroleum coke is sent to a linear screening machine for screening. The graphitized petroleum coke with a particle size of more than 6mm is hoisted by a crane to a Raymond mill for grinding. The raw materials after grinding are sent to a kneading machine through a screw conveyor.

[0044] (ii) Kneading: The screened graphitized petroleum coke and the binder medium-temperature reformed asphalt are sent to the kneading machine. A pair of blades of the kneading machine cooperate with each other and rotate to produce a strong shearing effect, so that the semi-dry thick material is quickly and evenly mixed. During the kneading process, the heating temperature is 120°C, the ring heat transfer oil heating method is adopted, and the cooling method is water cooling to ensure the kneading effect. After the kneading is completed, the kneading cylinder cover is added for closed kneading to obtain a uniform paste.

[0045] (III) Pressing cooling: The kneaded paste is discharged into the cooling tank of the hydraulic molding machine through the discharge pipe, and the paste is cooled to the softening process temperature of 80°C using the cooling water coil around the cooling tank. Subsequently, the cooled paste is loaded into the press by spiral extrusion, and pressed by the hydraulic molding machine to form a molded crucible. After the pressing is completed, cooling water is passed into the mold for further cooling to form a solid crucible, and then the mold is withdrawn to obtain a molded crucible product.

[0046] (IV) Calcination: The formed crucible and filler are sent into the ring furnace for calcination. During the loading process, the filler is loaded into the crucible by negative pressure suction, and the crucible with filler, resistor material and insulation material are loaded into the furnace layer by layer by the crane. During the calcination process, the supply voltage is controlled so that the calcination temperature is increased according to a certain temperature rise curve. After reaching 1300°C, the power supply is stopped to complete the calcination process. The flue gas generated by calcination is collected through the negative pressure collection channel on the top floor of the furnace, and is discharged after being treated in a double alkali desulfurization bag filter.

[0047] (V) Machining: After the crucible is naturally cooled after roasting, it is ground, shaped and rounded by a grinder, lathe or boring machine to obtain the final graphitized crucible product.

[0048] The first embodiment provides a complete production process of the graphitized crucible, from raw material screening, kneading, pressing and cooling to roasting, and then to final machining. The operation method and process parameters are described in detail for each step. Through these steps, the production quality of the graphitized crucible can be ensured to meet the strict requirements of industrial applications.

[0049] Embodiment 2:

[0050] This embodiment 2 describes the production process of graphitized crucible roasting, which specifically includes the following steps:

[0051] (1) The raw materials used in the crucible loading process are the forming crucible and the filling material. The forming crucible is transported from the forming fork to the roasting workshop. The crucible loading process is carried out in the roasting workshop. Two sets of negative pressure suction crucible systems are set up. The crucible is loaded by negative pressure suction, and the metallurgical coke is loaded into the crucible;

[0052] (ii) The crucibles filled with fillers are loaded into the annular furnace using a crane. The loading process is divided into three layers. The crucibles are spaced 50 mm apart. 0-4 mm calcined petroleum coke is filled between the crucibles as insulation material, and 4-6 mm calcined petroleum coke is filled outside the resistor material as resistance material. The insulation material and resistor material are transported from the finished product bin in the calcining workshop to the roasting workshop by a forklift. When loading the furnace, first load a layer of steel plate at the boundary between the resistor material and the insulation material, then use a crane to lift the crucible to load the first layer, then use a crane to directly lift the resistor material bag, load a layer of resistor material within the steel plate range, and then use the same method to load the second and third layers. After the crucible and resistor material are loaded into the furnace, use the same method to load the insulation material between the steel plate and the furnace wall;

[0053] (III) After the furnace is loaded, the furnace cover is put on and the power supply system is started to supply electricity. The crucible and resistor materials in the furnace are heated by the current and the temperature gradually rises. By controlling the power supply voltage, the roasting temperature is raised according to a certain temperature rise curve. After the temperature reaches 1300°C, the power supply is stopped to complete the roasting process. The roasting flue gas generated during the roasting process is collected through the negative pressure collection channel on the top floor of the furnace. An ignition device is set in the channel to ignite and burn the volatiles. The flue gas is then discharged after being desulfurized by a double alkali method bag dust collector;

[0054] (IV) After the roasting is completed, the charge is cooled down naturally, and the furnace operates alternately. When cooling down, the material is cooled down gradually from the outside to the inside. When the temperature of the furnace top insulation material and the resistor material drops to 60°C, the furnace cover is opened, and the furnace top insulation material and the resistor material are loaded out of the furnace through a special grab shovel by the crane to expose the crucible layer. After the crucible layer is completely cooled, the crucible is taken out by the crane, and then the second and third crucibles are cleaned in turn. The cleared insulation material and resistor material are loaded and transported to the temporary storage room of the raw materials in the workshop by the grab shovel of the crane to the temporary storage in the workshop for reuse. The metallurgical coke in the crucible is sucked out by the negative pressure crucible unloading system and temporarily stored in the ton bag for reuse. The insulation material, resistor material and filling material can be reused. There will be burn loss during the firing process, mainly sulfur, volatile matter, water escape and carbon oxidation to generate carbon dioxide escape. New materials are added to the insufficient burn loss. The roasted crucible is transported to the negative electrode material workshop by another car for standby use.

[0055] This second embodiment describes in detail the specific operations and process parameters during the graphitized crucible roasting process, ensuring the high efficiency and environmental protection of the roasting process. By adopting a negative pressure suction system and a ring furnace, as well as precise control of the roasting temperature, strict control of the quality of the graphitized crucible is achieved. In addition, the flue gas generated during the roasting process is effectively desulfurized and dust-removed, meeting environmental emission standards.

[0056] In summary, the production process of a graphitized crucible of the present invention not only improves production efficiency, but also significantly reduces the impact on the environment. Through the detailed description of Example 1 and Example 2, it can be seen that each step, from the screening of raw materials to the machining of the final product, strictly follows the process flow and quality control standards. This production method not only ensures the high quality of the graphitized crucible, but also reduces energy consumption and waste generation by optimizing the process flow, thereby realizing a sustainable production model. Finally, graphitized crucible products are widely used in metallurgy, chemical industry, electronics and other fields due to their excellent performance and environmental protection characteristics, meeting the demand for high-performance refractory materials in industrial production.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A production process for a graphitized crucible, characterized in that: The following steps are involved: Step 1, screening and batching: Screen the raw materials to obtain graphitized petroleum coke and binder medium-temperature reformed asphalt that meet the requirements, control the batching ratio, use conveyors for batching, and strengthen production environment management to control unorganized emissions and meet the requirements of clean production source control; Step 2, kneading: the screened graphitized petroleum coke and the binder medium-temperature reformed asphalt are fed into the kneader, and a pair of blades of the kneader cooperate with each other and rotate to produce a strong shearing effect, so that the semi-dry thick material is quickly and evenly mixed. During the kneading process, the heating temperature is 120°C, the ring heat transfer oil heating method is adopted, and the cooling method is water cooling to ensure the kneading effect. After the kneading is completed, the kneading cylinder cover is covered for closed kneading to obtain a uniform paste; Step 3, press cooling: the kneaded paste is discharged into the cooling tank of the hydraulic molding machine through the discharge pipe, and the paste is cooled to the softening process temperature of 80°C by the cooling water coil around the cooling tank. Subsequently, the cooled paste is loaded into the press by spiral extrusion, and the hydraulic molding machine is used for pressing to form a molded crucible. After the pressing is completed, cooling water is introduced into the mold for further cooling to form a solid crucible, and then the mold is withdrawn to obtain a molded crucible product; Step 4, roasting: the formed crucible and the filler are sent into the ring furnace for roasting. During the loading process, the filler is loaded into the crucible by negative pressure suction, and the crucible with the filler, the resistor material and the insulation material are loaded into the furnace in layers by the crane. During the roasting process, the power supply voltage is controlled to increase the roasting temperature according to a certain temperature rise curve. After reaching 1300°C, the power supply is stopped to complete the roasting process. The flue gas generated by the roasting is collected through the negative pressure collection channel on the top floor of the furnace, and is discharged after being treated by the double alkali desulfurization bag filter; Step 5, machining: After the crucible is naturally cooled after being roasted, it is ground, shaped and rounded by a grinder, lathe or boring machine to obtain the final graphitized crucible product.

2. The production process of a graphitized crucible according to claim 1, characterized in that: The graphitized petroleum coke is mainly a by-product of the production of negative electrode materials. During the screening process, the graphitized petroleum coke is sent to a linear screening machine for screening treatment, wherein the graphitized petroleum coke with a particle size greater than 6 mm is lifted by a crane to a Raymond mill for grinding treatment, and the raw materials after grinding treatment are sent to a kneader through a screw conveyor.

3. The production process of a graphitized crucible according to claim 1, characterized in that: The binder is medium-temperature reformed asphalt, which plays a key bonding role in the kneading process, ensuring uniform mixing of graphitized petroleum coke and asphalt, thereby improving the structural strength and heat resistance of the crucible.

4. The production process of a graphitized crucible according to claim 1, characterized in that: The kneading machine is heated by heat-conducting oil, which can make full use of the waste heat from the production of calcined petroleum coke, does not require supporting heating equipment, and meets the clean production requirements of waste heat utilization, energy saving and consumption reduction.

5. The production process of a graphitized crucible according to claim 3, characterized in that: The asphalt fume is collected by setting a collection pipe in the asphalt tank and a gas collecting hood on the top of the kneading machine, and the collected waste gas is purified by an electric tar precipitator purification device.

6. The production process of a graphitized crucible according to claim 1, characterized in that: The process flow of the roasting is: S1: The raw materials used in the crucible loading process are forming crucibles and filling materials. The forming crucibles are transported from the forming fork to the roasting workshop. The crucible loading process is carried out in the roasting workshop. Two sets of negative pressure suction crucible systems are set up. The crucibles are loaded by negative pressure suction, and the metallurgical coke is loaded into the crucibles; S2: The crucibles filled with fillers are loaded into the ring furnace by a crane. The loading process is divided into three layers. The crucible spacing is 50mm. 0-4mm particle size calcined petroleum coke is filled between the crucibles as insulation material, and 4-6mm particle size calcined petroleum coke is filled outside the resistor material as resistor material. S3: After the furnace is loaded, the furnace cover is added, and the power supply system is started to supply power. The crucible and the resistor material in the furnace are heated under the action of the current, and the temperature gradually rises. By controlling the power supply voltage, the roasting temperature is raised according to a certain temperature rise curve. When the temperature reaches 1300°C, the power supply is stopped to complete the roasting process; S4: After the roasting is completed, the charge is cooled down naturally, and the furnace operates alternately. When cooling down, the material is cooled down gradually from the outside to the inside. When the temperature of the furnace top insulation material and the resistor material drops to 60°C, the furnace cover is opened, and the furnace top insulation material and the resistor material are shoveled out of the furnace through a special grab bucket by the crane to expose the crucible layer. After the crucible layer is completely cooled, the crucible is taken out by the crane, and then the second and third layers of crucibles are cleaned in turn.

7. The production process of a graphitized crucible according to claim 6, characterized in that: The insulation material and resistor material are transported to the roasting workshop by forklifts in ton bags from the finished product silo in the calcining workshop. When loading the furnace, firstly, a layer of steel plate is loaded at the boundary of the resistor material and the insulation material, and then the crucible is lifted by a crane to load the first layer, and then the ton bag of resistor material is directly lifted by the crane, and a layer of resistor material is loaded within the range of the steel plate, and then the second and third layers are loaded in the same way. After the crucible and resistor material are loaded into the furnace, the insulation material is loaded between the steel plate and the furnace wall in the same way.

8. The production process of a graphitized crucible according to claim 6, characterized in that: The roasting flue gas generated in the roasting process is collected through a negative pressure collection channel on the top layer of the furnace. An ignition device is arranged in the channel to ignite and burn volatiles. The flue gas is then discharged after being subjected to double alkali desulfurization bag dust removal.

9. The production process of a graphitized crucible according to claim 6, characterized in that: The cleared insulation materials and resistor materials are shoveled and transported to the temporary raw material storage room in the workshop for reuse. The metallurgical coke in the crucible is sucked out by the negative pressure crucible unloading system and temporarily stored in ton bags for reuse. The insulation materials, resistor materials and filling materials can all be reused. There will be burnt losses during the burning process, mainly the escape of sulfur, volatile matter, water and the escape of carbon dioxide generated by carbon oxidation. New materials are added to the part that is not lost. The roasted crucible is transported to the negative electrode material workshop by another vehicle for standby use.

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