Graphitized filler filling structure and filling method
By using the filling layer of new materials, old materials and post-sieve materials during industrial silicon smelting, the problems of sprayer risks and high production costs caused by poor breathability of the filling material are solved, and safety and economy are improved.
Patent Information
- Application Number
- CN202311541619.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-13
- Publication Date
- 2025-06-13
AI Technical Summary
During the industrial silicon smelting process, the commonly used filler is high in metallurgical coke powder content and poor breathability, resulting in carbon monoxide accumulation in the graphitization furnace pit, which is prone to spraying furnace accidents, poses fire hazards, and has high production costs.
The combination of new materials, old materials and post-sieve materials is used. By laying filler layers of different thicknesses in the graphitization furnace pit, the filler has both good thermal insulation and breathability, thereby reducing the risk of spraying furnaces and reducing production costs.
It has achieved the improvement of production safety, reduced power consumption and production costs while ensuring the graphitization yield, and avoided the occurrence of spray furnace accidents.
Smart Images
Figure CN120141148A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of industrial silicon production, and specifically to a filling structure and filling method of graphitized filler. Background Art
[0002] At present, electrodes are required in the smelting process of industrial silicon. During the production process of the electrodes, graphitization operations are needed. In the graphitization furnace pit, the electrodes need to be covered with filler. The filler uses metallurgical coke. The filler should not only have a heat preservation effect but also have air permeability. During the production process, the common method is to use all new materials for the filler. The new materials contain metallurgical coke particles and metallurgical coke powder. After the new materials are filled, due to the high content of metallurgical coke powder in the new materials, the air permeability of the filler is poor. The new materials have good antioxidant effects. After graphitization starts, a large amount of carbon monoxide is generated inside the filler in the graphitization furnace pit in a short time. Due to the poor air permeability of the metallurgical coke powder, the carbon monoxide is pressed under the filler in the graphitization furnace pit, that is, the air pressure in the graphitization furnace pit is large. When the gas pressure inside the filler reaches a certain value, a situation of furnace explosion will occur. The high-temperature metallurgical coke ejected is likely to scald the staff and is also likely to damage the facilities around the graphitization furnace pit, posing a fire hazard. Therefore, it is necessary to improve the structure of the filler so that the filler not only has a heat preservation effect but also has air permeability, improving production safety and reducing production costs while ensuring the graphitization yield. Summary of the Invention
[0003] The purpose of the present invention is to provide a filling structure and filling method of graphitized filler that not only has a heat preservation effect but also has air permeability, improving production safety, reducing power consumption, and reducing production costs while ensuring the graphitization yield.
[0004] The first object of the present invention is achieved as follows: The filling structure of graphitized filler includes: Graphitization furnace pit; Graphite electrode blank; A first filler layer is laid at the bottom of the graphitization furnace pit, a second filler layer is laid above the first filler layer, the graphite electrode blank is located on the second filler layer, a third filler layer is laid on the second filler layer and the graphite electrode blank, the third filler layer and the second filler layer tightly wrap the graphite electrode blank, and a fourth filler layer is laid above the third filler layer; Among them, the first mixture layer is old material, the second filler layer is new material or screened material, the third mixture layer is new material or screened material, and the fourth mixture layer is old material; The new material is unused new metallurgical coke, the old material is used old metallurgical coke, and the screened material is new granular metallurgical coke after screening out the powder.
[0005] The thickness of the second filler layer described above is 100 mm to 300 mm, and the thickness of the third filler layer is 100 mm to 300 mm.
[0006] The thickness of the second filler layer described above is 200 mm, and the thickness of the third filler layer is 200 mm.
[0007] Furthermore, the thickness of the first mixture layer is not less than 200 mm, and the thickness of the fourth mixture layer is not less than 200 mm.
[0008] The second object of the present invention is achieved as follows: The graphitization filler filling method is carried out according to the following steps. Step 1, lay the first filler layer at the bottom of the graphitization furnace pit. Step 2, lay the second filler layer above the first filler layer. Step 3, place the graphitization electrode blank on the second filler layer. Step 4, lay the third filler layer on the second filling layer and the graphitization electrode blank. The third filler layer and the second filler layer tightly wrap the graphite electrode blank. Step 5, lay the fourth filler layer above the third filler layer. Among them, the first mixture layer is old material, the second filler layer is new material or sieved material, the third mixture layer is new material or sieved material, the fourth mixture layer is old material, the new material is unused new metallurgical coke, the old material is used old metallurgical coke, and the sieved material is new granular metallurgical coke after sieving out the powder.
[0009] The thickness of the second filler layer described above is 100 mm to 300 mm, and the thickness of the third filler layer is 100 mm to 300 mm.
[0010] The thickness of the second filler layer described above is 200 mm, and the thickness of the third filler layer is 200 mm.
[0011] Furthermore, the thickness of the first mixture layer is not less than 200 mm, and the thickness of the fourth mixture layer is not less than 200 mm.
[0012] By implementing the above technical solutions, the filler not only has a heat preservation effect but also has air permeability. While ensuring the graphitization yield, it improves production safety and reduces production costs. In this application, new material, old material, and sieved material are used in combination. After the same filler combination is used, the power consumption during power transmission is reduced, and the graphitization quality is guaranteed. This application reduces energy consumption, ensures product quality, and eliminates the danger of furnace explosion. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The specific structure of the present invention is given by the following drawings and embodiments: Figure 1 It is a schematic cross-sectional structure diagram of a structure filled with graphitized filler.
[0014] Legend: 1. First filler layer, 2. Second filler layer, 3. Third filler layer, 4. Fourth filler layer, 5. Graphitization furnace pit, 6. Graphite electrode blank. Embodiment
[0015] The present invention is not limited by the following embodiments, and specific implementation manners can be determined according to the technical solution of the present invention and actual situations.
[0016] Embodiment: As Figure 1 shown, the graphitized filler filling structure includes: Graphitization furnace pit 5; Graphite electrode blank 6; A first filler layer 1 is laid at the bottom of the graphitization furnace pit. A second filler layer 2 is laid above the first filler layer. The graphite electrode blank is located on the second filler layer. A third filler layer 3 is laid on the second filler layer and the graphite electrode blank. The third filler layer and the second filler layer tightly wrap the graphite electrode blank. A fourth filler layer 4 is laid above the third filler layer; Among them, the first mixture layer is old material, the second filler layer is new material or screened material, the third mixture layer is new material or screened material, and the fourth mixture layer is old material; the new material is unused new metallurgical coke, the old material is used old metallurgical coke, and the screened material is new granular metallurgical coke after screening out powder.
[0017] The thickness of the above-mentioned second filler layer is 100 mm to 300 mm, and the thickness of the third filler layer is 100 mm to 300 mm.
[0018] The thickness of the above-mentioned second filler layer is 200 mm, and the thickness of the third filler layer is 200 mm.
[0019] Furthermore, the thickness of the first mixture layer is not less than 200 mm, and the thickness of the fourth mixture layer is not less than 200 mm.
[0020] The second object of the present invention is achieved as follows: The graphitized filler filling method is carried out according to the following steps, Step 1, lay a first filler layer at the bottom of the graphitization furnace pit; Step 2, lay a second filler layer above the first filler layer; Step 3, place the graphitized electrode blank on the second filler layer; Step 4, lay a third filler layer on the second filler layer and the graphitized electrode blank. The third filler layer and the second filler layer tightly wrap the graphite electrode blank; Step 5: Lay a fourth filler layer above the third filler layer; Among them, the first mixture layer is old material, the second filler layer is new material or screened material, the third mixture layer is new material or screened material, and the fourth mixture layer is old material; the new material is unused new metallurgical coke, the old material is used old metallurgical coke, and the screened material is new granular metallurgical coke after screening out powder.
[0021] The thickness of the above-mentioned second filler layer is 100 mm to 300 mm, and the thickness of the third filler layer is 100 mm to 300 mm.
[0022] The thickness of the above-mentioned second filler layer is 200 mm, and the thickness of the third filler layer is 200 mm.
[0023] Furthermore, the thickness of the first mixture layer is not less than 200 mm, and the thickness of the fourth mixture layer is not less than 200 mm.
[0024] As shown in Table 1: Control Group 1: The bottom material of the 5# graphitization furnace pit uses new material, and the upper layer material also uses new material, and its yield is 100%. Although the yield of this plan is high, but all the bottom material and the upper layer material use new material. During the electrode graphitization operation, a large amount of carbon monoxide gas will be generated in the furnace pit in a short time, and the air pressure of the upper layer material is large, and there is a risk of furnace explosion. In addition, all the bottom material and the upper layer material use new material, and the production cost is too high, affecting the economic benefits; Control Group 2: The bottom material and the upper layer material of the 10# graphitization furnace pit both use screened material, and its yield is 97.5%, which can meet the production requirements. However, the screened material is the granular material generated after filtering the powder of the new material, with an additional screening process, increasing the cost. At the same time, because the screened material is all granular material, the air permeability of the entire graphitization furnace pit is good, but the heat preservation is not good; Control Group 3: The bottom material and the upper layer material of the 12# graphitization furnace pit both use old material. This old material is the metallurgical coke generated after the new material is used once, that is, the reused metallurgical coke. Because the bottom material and the upper layer material use old material, the antioxidant ability of the graphitization furnace pit is weakened. The oxygen carried in the air and the old material enters the upper layer material and the bottom material, and reacts with the electrode to cause electrode oxidation, reducing the yield; Experimental Group 1: The bottom material of the 13# graphitization furnace pit uses 200 mm old material + 200 mm screened material, and the upper layer material uses 200 mm screened material + 200 mm old material, with a yield of 97.5%, which can meet the production requirements. Because old material is used, the production cost is greatly reduced. The screened material has high antioxidant ability and good air permeability, and the old material has good heat preservation, and at the same time, there will be no risk of large air pressure and furnace explosion; Control Group Four: For the bottom material of the 15# graphitization furnace pit, 200mm screened material + 200mm new material is used. For the upper layer material, 200mm new material + 200mm screened material is used. The finished product rate is 97.5%, which can meet the production requirements. Since the screened material is the material obtained after screening the new material, the cost is higher than that of the new material. Therefore, this scheme has the highest cost. The combination of the screened material and the new material has good air permeability, but slightly poor heat preservation performance. Experimental Group Two: For the bottom material of the 14# graphitization furnace pit, 200mm used material + 200mm new material is used. For the upper layer material, 200mm new material + 200mm used material is used. The finished product rate is 100%. The combined use of new and used materials not only reduces the production cost but also ensures the requirements of air permeability and heat preservation performance. It can well prevent the electrodes from being oxidized, and at the same time, the graphitization effect is the best.
[0025] From the above test data, it can be seen that Experimental Group Two has the best effect, achieving a perfect balance among production cost, safety, and finished product rate. Although Experimental Group One uses a part of the screened material, which increases the cost, it also uses a part of the used material, which can well balance the cost. While meeting the requirements of the finished product rate, it reduces the risk of furnace explosion and can also reduce the probability of electrode oxidation. Control Group Four uses the screened material and the new material, with high cost, weak heat preservation performance, and weak electrode oxidation resistance. Control Group One uses all new materials, with high cost, poor air permeability, and a risk of furnace explosion. Control Group Two uses all screened materials, with the highest cost, weak heat preservation effect, and weak oxidation resistance. Control Group Three uses all used materials, with the lowest cost, but poor air permeability and the lowest finished product rate. In this application, the new material, used material, and screened material are used in combination. After the same filler combination is used, the power consumption during power transmission is reduced, and the graphitization quality is guaranteed. This application reduces energy consumption, ensures product quality, and eliminates the risk of furnace explosion.
[0026] The above description is only an example for clearly explaining the present invention, and is not a limitation on the implementation mode of the present invention. Any obvious changes or variations derived from the technical solution of the present invention still fall within the protection scope of the present invention.
[0027] Furnace number Bottom furnace material (first filler layer + second filler layer) Upper layer material (third filler layer + fourth filler layer) Yield rate 5# New material New material 100% 10# Screened material Screened material 97.5% 12# Old material Old material 92.5% 13# 200mm old material + 200mm screened material 200mm screened material + 200mm old material 97.5% 15# 200mm screened material + 200mm new material 200mm new material + 200mm screened material 97.5% 14# 200mm old material + 200mm new material 200mm new material + 200mm old material 100%
Claims
1. A filling structure of graphitized filler, characterized in that, it includes: A graphitization furnace pit; A graphite electrode blank; A first filler layer is laid at the bottom of the graphitization furnace pit, a second filler layer is laid above the first filler layer, the graphite electrode blank is located on the second filler layer, a third filler layer is laid on the second filler layer and the graphite electrode blank, the third filler layer and the second filler layer tightly wrap the graphite electrode blank, and a fourth filler layer is laid above the third filler layer; Among them, the first mixture layer is old material, the second filler layer is new material or screened material, the third mixture layer is new material or screened material, and the fourth mixture layer is old material; The new material is unused new metallurgical coke, the old material is used old metallurgical coke, and the screened material is new granular metallurgical coke after screening out the powder.
2. The graphitized filler filling structure according to claim 1, characterized in that, The thickness of the second filler layer is 100 mm to 300 mm, and the thickness of the third filler layer is 100 mm to 300 mm.
3. The graphitized filler filling structure according to claim 2, characterized in that, The thickness of the second filler layer is 200 mm, and the thickness of the third filler layer is 200 mm.
4. The graphitized filler filling structure according to claim 1, characterized in that, The thickness of the first mixture layer is not less than 200 mm, and the thickness of the fourth mixture layer is not less than 200 mm.
5. A method for filling graphitized filler, which is executed according to the following steps, Step 1, lay a first filler layer at the bottom of the graphitization furnace pit; Step 2, lay a second filler layer above the first filler layer; Step 3, place the graphitized electrode blank on the second filler layer; Step 4, lay a third filler layer on the second filler layer and the graphitized electrode blank, and the third filler layer and the second filler layer tightly wrap the graphite electrode blank; Step 5, lay a fourth filler layer above the third filler layer; Among them, The first mixture layer is old material, the second filler layer is new material or screened material, the third mixture layer is new material or screened material, the fourth mixture layer is old material, the new material is unused new metallurgical coke, the old material is used old metallurgical coke, and the screened material is new granular metallurgical coke after screening out the powder.
6. The graphitized filler filling structure according to claim 5, characterized in that, The thickness of the second filler layer is 100 mm to 300 mm, and the thickness of the third filler layer is 100 mm to 300 mm.
7. The graphitized filler filling structure according to claim 6, characterized in that, The thickness of the second filler layer is 200 mm, and the thickness of the third filler layer is 200 mm.
8. The graphitized filler filling structure according to claim 5, characterized in that, The thickness of the first mixture layer is not less than 200 mm, and the thickness of the fourth mixture layer is not less than 200 mm.