CN116943836A - Preparation equipment and preparation method for processing graphite electrode material by arc method - Google Patents

Abstract

The invention relates to the technical field of quartz crucible production in the photovoltaic field, and discloses a preparation device and a preparation method for processing graphite electrode materials by an arc method. According to the invention, the main materials are mixed and insulated, then melted coal tar pitch is added for kneading, and then the mode of stirring from outside to inside is implemented in the cooling process, so that the raw materials and the coal tar pitch are fully dispersed and mixed, the occurrence of hard cold materials is prevented, a uniform formed prefabricated body is obtained, the agglomeration of the inside of the kneaded materials after roasting is solved, and the occurrence of air holes is avoided, thereby solving the problem of falling off of a graphite electrode.

Description

Preparation equipment and preparation method for arc processing of graphite electrode materials

Technical field

The present invention relates to the technical field of quartz crucible production in the photovoltaic field, and in particular to a preparation equipment and preparation method for arc processing of graphite electrode materials.

Background technique

Graphite electrode refers to a kind of resistant electrode made of petroleum coke and pitch coke as aggregates and coal pitch as binder. It is made by calcining raw materials, crushing and grinding, batching, kneading, shaping, roasting, impregnation, graphitization and mechanical processing. High-temperature graphite conductive materials are called artificial graphite electrodes to distinguish them from natural graphite electrodes prepared from natural graphite.

A Chinese patent has disclosed: A method for preparing modified graphite electrode materials, patent application number: 202011477581. Add the cationic polymer, stir the reaction in a constant temperature water bath at 100°C-120°C, and obtain the first reactant; S2: Pour ionic liquid and carbon oxysulfide into the first reactant in sequence, and stir at 100°C-150°C. React for 0.5h-2h to obtain the second reactant; S3: Wash the second reactant with deionized water, then place it in a drying oven at 220°C-300°C for solidification treatment for 10h-15h, and then use a ball mill to grind it for 2h- For 3 hours, make the particle size of the ball-milled powder less than 2 μm. Then, under the protection of nitrogen, place the ball-milled powder in a high-temperature heating furnace for carbonization treatment. The temperature of the carbonization treatment is 600°C-800°C, and the pressure is 30MPa-50MPa, the reaction time is 10h-20h, and the third reactant is obtained; S4: After mixing the third reactant and the conductive agent, grind it, then disperse it in absolute ethanol, add the binder and potassium oxalate, Stir evenly, dry, and press into tablets to obtain a modified graphite electrode material, in which the cationic polymer is aluminum hydroxyl; the mass ratio of the graphite to the cationic polymer is 1:0.01; the ionic liquid is 1-butyl- 3-methylimidazole bromide; the mass ratio of the first reactant to ionic liquid and carbon oxysulfide is 1:0.01:0.1; the conductive agent is acetylene black, the binder is polyvinylidene fluoride, and the third reactant is The mass ratio of conductive agent, absolute ethanol, and adhesive is 1:0.3:1:0.01".

However, the graphite electrode of this equipment has the phenomenon of falling off and slag during use, which is mainly caused by the agglomeration of materials and pores inside the electrode. For this reason, we propose a preparation equipment and preparation method for arc processing of graphite electrode materials.

Contents of the invention

The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a preparation equipment and preparation method for processing graphite electrode materials by arc method.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A preparation equipment for arc processing of graphite electrode materials, including a stirring chamber, a crushing chamber and a crushing chamber. A feeding hopper is fixed on the top of the crushing chamber, and two crushing rollers rotate inside the crushing chamber. A second screen is fixed at the bottom of the crushing chamber. The bottom of the crushing chamber communicates with the top of the crushing chamber. A first valve is provided at the bottom of the crushing chamber. A rotating shaft rotates inside the crushing chamber. A clamp for grinding is fixed at the bottom of the rotating shaft. Block, a transmission pipe is fixed at the bottom of the crushing chamber, a second valve is provided inside the transmission pipe, a first screen is fixed on the inner wall of the transmission pipe, a connector is fixed at the bottom of the crushing chamber, and the connector is fixed at the bottom It is fixed with the stirring chamber, a feeding pipe is fixed on the top of the stirring chamber, and a stirring equipment is provided inside the stirring chamber.

Preferably, the bottom end of the inner wall of the crushing chamber is wedge-shaped, with one end opposite to the stirring chamber being narrower and an end facing away from the stirring chamber being wider.

Preferably, a cross bar is fixed on the inner wall of the crushing chamber, and the top of the rotating shaft and the bottom of the cross bar are fixed together.

Preferably, the bottom of the clamping block is in a wedge shape that matches the inner wall of the crushing chamber.

Preferably, a motor is fixed on the wall of the feeding chamber, a limiting plate is fixed on the free end of the motor shaft, and scrapers slide on both upper and lower ends of the limiting plate.

Preferably, springs are fixed at opposite ends of the two scrapers, and the free ends of the two springs are fixed to the inner wall of the limiting plate.

A preparation method for arc processing graphite electrode material, the specific steps are:

S1. Crush and screen the calcined petroleum coke raw materials, add graphite powder for mixing, and graphite powder accounts for ~10%;

S2. After adding coal pitch (~18%) and mixing, knead at 150~200°C, cool after completion, and then extruded;

S3. Roast at 600~1200℃ for 12 hours, add coal pitch and vacuum carburize in the carbon impregnation tank, roast (same as above), graphitize, and special-shaped processing.

beneficial effects

The invention provides a preparation equipment and a preparation method for processing graphite electrode materials by arc method. It has the following beneficial effects:

(1) This kind of preparation equipment and preparation method for arc processing of graphite electrode materials, the material is transported to the interior of the crushing chamber through a feed hopper, and the material is crushed through two crushing roller drives to make the material suitable in size. The crushed raw materials fall into the crushing chamber. At this time, the clamping block rotates to crush and grind the raw materials, so that the raw materials are finely ground. After the calcined petroleum coke is ground, it is transported to the inside of the mixing chamber, and the graphite powder is transported through the feeding pipe. Stir inside the mixing chamber. The process is: raw materials → crushing → screening → mixing (graphite powder accounts for ~10%) → adding coal pitch (~18%) → kneading at 150~200°C → cooling → extrusion molding → roasting (600~1200℃, 12h) → Add coal pitch and vacuum carburize in the carburizing tank → Roasting (same as above) → Graphitization treatment → Special-shaped processing → Graphite electrode. This technology first mixes the main materials and keeps them warm and then adds melted coal pitch. Carry out kneading, and then implement stirring from the outside to the inside during the cooling process to fully disperse and mix the raw materials and coal pitch to prevent the appearance of hard cold materials, obtain a uniform shaped preform, and solve the problem of internal agglomeration and internal agglomeration of the kneaded materials after roasting. The generation of pores is avoided, thereby solving the problem of graphite electrode falling off.

(2) This preparation equipment and method for arc processing of graphite electrode materials has the characteristics of low resistivity, low cost, high quality, and high output; it solves the problems of shedding and slag falling, and extends the use time.

Description of the drawings

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, other implementation drawings can be obtained based on the extension of the provided drawings without exerting creative efforts.

The structures, proportions, sizes, etc. shown in this specification are only used to coordinate with the contents disclosed in the specification for the understanding and reading of people familiar with this technology. They are not used to limit the conditions under which the invention can be implemented, and therefore do not have any technical Any structural modification, change in proportion or size adjustment shall still fall within the scope of the technical content disclosed in the present invention without affecting the effectiveness and purpose achieved by the present invention. within the scope that can be covered.

Figure 1 is a block diagram of the preparation of graphite electrode materials of the present invention;

Figure 2 is a schematic diagram of the mixing chamber of the present invention;

Figure 3 is a schematic structural diagram of the crushing chamber of the present invention;

Figure 4 is a schematic structural diagram of the feeding chamber of the present invention;

Figure 5 is a schematic structural diagram of the crushing chamber of the present invention.

Legend: 11. Mixing chamber; 12. Crushing chamber; 13. Crushing chamber; 14. Feed hopper; 15. Feeding pipe; 16. Connector; 17. Transfer pipe; 18. First screen; 19. Crushing roller Shaft; 20. Second screen; 21. Feeding chamber; 22. Motor; 23. Limit plate; 24. Scraper; 25. Spring; 26. Cross bar; 27. Rotating shaft; 28. Block.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Embodiment 1: A preparation equipment and preparation method for arc processing of graphite electrode materials, as shown in Figures 2 to 5, including a stirring chamber 11, a crushing chamber 12 and a crushing chamber 13. The top of the crushing chamber 13 is fixed with an inlet. There are two crushing rollers 19 rotating inside the hopper 14 and the crushing chamber 13. A second screen 20 is fixed at the bottom of the crushing chamber 13. The bottom of the crushing chamber 13 communicates with the top of the crushing chamber 12, and a first valve is provided at the bottom of the crushing chamber 13. , there is a rotating shaft 27 rotating inside the grinding chamber 12, and a clamping block 28 for grinding is fixed at the bottom of the rotating shaft 27. A transmission pipe 17 is fixed at the bottom of the grinding chamber 12. A second valve is provided inside the transmission pipe 17, and a first valve is fixed on the inner wall of the transmission pipe 17. The screen 18 is fixed with a connecting piece 16 at the bottom of the crushing chamber 12. The bottom of the connecting piece 16 is fixed with the mixing chamber 11. A feeding pipe 15 is fixed at the top of the mixing chamber 11. There is a mixing equipment inside the mixing chamber 11. The bottom end of the inner wall of the grinding chamber 12 is Wedge-shaped, with one end opposite to the mixing chamber 11 narrower and one end away from the mixing chamber 11 wider. A horizontal bar 26 is fixed on the inner wall of the crushing chamber 12. The top of the rotating shaft 27 and the bottom of the horizontal bar 26 are fixed together. The bottom of the clamping block 28 is in the shape of a wedge. The wedge shape is adapted to the inner wall of the crushing chamber 12. A motor 22 is fixed on the inner wall of the feeding chamber 21. A limit plate 23 is fixed at the free end of the shaft of the motor 22. There are scrapers 24 sliding on both upper and lower ends of the limit plate 23. Two Spring 25 is fixed at both opposite ends of the scraper 24, and the free ends of the two springs 25 are fixed to the inner wall of the limiting plate 23. The index range of the prepared graphite electrode is: resistivity <8.5μΩ·m, ash content ≤30ppm, volume density ≥1.68g/cm3, obtain a uniform shaped preform, solve the internal agglomeration of the kneaded material after roasting and avoid the generation of pores, thus solving the problem of graphite electrode shedding;

Embodiment 2: A preparation method for arc processing of graphite electrode materials, as shown in Figure 1, the specific steps are:

S1. Crush and screen the calcined petroleum coke raw materials, add graphite powder for mixing, and graphite powder accounts for ~10%;

S2. After adding coal pitch (~18%) and mixing, knead at 150~200°C, cool after completion, and then extruded;

S3. Roast at 600~1200℃ for 12 hours, add coal pitch and vacuum carburize in the carbon impregnation tank, roast (same as above), graphitize, and special-shaped processing.

Working principle of the invention:

The first step: transport the material to the interior of the crushing chamber 13 through the feed hopper 14, and crush the material through the driving of the two crushing rollers 19, so that the crushed raw materials of suitable size fall into the interior of the crushing chamber 12. At this time, the block 28 Rotate to crush and grind the raw materials, so that the raw materials are finely ground. After the calcined petroleum coke is ground, it is transported to the inside of the mixing chamber 11. The graphite powder is transported to the inside of the mixing chamber 11 through the feeding pipe 15 for mixing. The process is: Raw materials → Crushing → Screening → Mixing (graphite powder accounts for ~10%) → Add coal pitch (~18%) → Kneading at 150~200℃ → Cooling → Extrusion molding → Roasting (600~1200℃, 12h) → Adding Coal pitch is vacuum carburized in the carbon impregnation tank → roasting (same as above) → graphitization treatment → special-shaped processing → graphite electrode. This technology first mixes the main materials and keeps them warm, then adds melted coal pitch for kneading, and then implements external cooling during the cooling process. The method of thorough stirring fully disperses and mixes the raw materials and coal pitch, prevents the appearance of hard cold materials, obtains a uniform preform, solves the problem of internal agglomeration of the kneaded materials after roasting and avoids the generation of pores, thereby solving the problem of graphite electrodes. shedding problem.

Step 2: The motor 22 drives the limiting plate 23 to rotate. At this time, the two scrapers 24 are in contact with the inner wall of the feeding chamber 21, so that the two scrapers 24 are in contact with the inner wall of the feeding chamber 21 during the rotation of the motor 22. Scratch to prevent graphite powder from adhering to the inner wall of the feeding chamber 21 and prevent material from being wasted.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have other aspects. Various changes and modifications are possible, which fall within the scope of the claimed invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. A preparation equipment for arc processing of graphite electrode materials, including a stirring chamber (11), a crushing chamber (12) and a crushing chamber (13). A feeding hopper (14) is fixed on the top of the crushing chamber (13). ), which is characterized in that: two crushing rollers (19) rotate inside the crushing chamber (13), and a second screen (20) is fixed at the bottom of the crushing chamber (13). The bottom communicates with the top of the crushing chamber (12), and a first valve is provided at the bottom of the crushing chamber (13). A rotating shaft (27) rotates inside the crushing chamber (12), and a grinding wheel for grinding is fixed at the bottom of the rotating shaft (27). Block (28), a transmission pipe (17) is fixed at the bottom of the crushing chamber (12), a second valve is provided inside the transmission pipe (17), and a first screen is fixed on the inner wall of the transmission pipe (17) (18), the bottom of the crushing chamber (12) is fixed with a connecting piece (16), the bottom of the connecting piece (16) is fixed with the stirring chamber (11), and the top of the stirring chamber (11) is fixed with a feeding pipe (15) ), the stirring chamber (11) is provided with stirring equipment inside. 2. A kind of preparation equipment for arc processing of graphite electrode materials according to claim 1, characterized in that: the bottom end of the inner wall of the crushing chamber (12) is wedge-shaped, and is opposite to the edge of the stirring chamber (11). One end is narrower and the end facing away from the stirring chamber (11) is wider. 3. A kind of preparation equipment for arc processing of graphite electrode materials according to claim 1, characterized in that: a cross bar (26) is fixed on the inner wall of the crushing chamber (12), and the top of the rotating shaft (27) Fixed together with the bottom of crossbar (26). 4. Preparation equipment for arc processing of graphite electrode materials according to claim 2, characterized in that: the bottom of the clamping block (28) has a wedge shape adapted to the inner wall of the crushing chamber (12). 5. A kind of preparation equipment for arc processing of graphite electrode materials according to claim 1, characterized in that: a motor (22) is fixed on the inner wall of the feeding chamber (21), and the shaft portion of the motor (22) A limiting plate (23) is fixed at the free end, and scrapers (24) slide on both upper and lower ends of the limiting plate (23). 6. A preparation equipment for arc processing of graphite electrode materials according to claim 5, characterized in that: springs (25) are fixed at opposite ends of the two scrapers (24), and two The free ends of the springs (25) are fixed to the inner wall of the limiting plate (23). 7. The preparation equipment for arc processing of graphite electrode materials according to claim 5, characterized in that: the scraper (24) is made of elastic rubber material. 8. A method for preparing graphite electrode materials for arc processing, which is characterized in that: the specific steps are: S1. Crush and screen the calcined petroleum coke raw materials, add graphite powder for mixing, and graphite powder accounts for ~10%; S2. After adding coal pitch (~18%) and mixing, knead at 150~200°C, cool after completion, and then extruded; S3. Roast at 600~1200℃ for 12 hours, add coal pitch and vacuum carburize in the carbon impregnation tank, roast (same as above), graphitize, and special-shaped processing.