A filler for carbon material baking and a method for preparing the same

Abstract

This invention belongs to the technical field of fillers for carbon material roasting, specifically relating to a filler for carbon material roasting and its preparation method. The filler for carbon material roasting includes graphitized coke, calcined coke, and silicon dioxide. The preparation method involves sieving the graphitized coke, mixing the graphitized coke according to different particle sizes and their respective weight percentages to obtain a graphitized coke mixture, then mixing silicon dioxide and calcined petroleum coke according to a specific weight ratio, and finally mixing them with the aforementioned graphitized coke particles according to a weight ratio to obtain the final roasting filler. The roasted product of this invention has significantly improved performance indicators and quality compared to ordinary raw products. It can not only shorten the roasting time by 24-40 hours, improving the user's production efficiency, but also reduce the ash content of the product, reduce the oxidation loss of the carbon material roasting filler, improve the thermal conductivity of the filler material, and reduce the user's production costs.

Description

Technical Field

[0001] This invention belongs to the technical field of fillers for carbon material calcination, specifically relating to a filler for carbon material calcination and its preparation method. Background Technology

[0002] Calcination refers to the heating process that must be carried out in the carbon production process. This process involves placing the green blank in a protective medium in a heating furnace and heating it at a certain rate under air-isolated conditions.

[0003] Metallurgical coke granules are a product obtained from the dry distillation of coking coal. In the carbon industry, they are mainly used as fillers and insulation materials. For the carbon industry, the lower the ash content of metallurgical coke, the better. However, existing filler metallurgical coke granules have high ash content and high porosity, which increases the surface area of ​​the roasted product in contact with air, leading to severe oxidation. Furthermore, metallurgical coke is relatively expensive. Summary of the Invention

[0004] To address the problems of high oxidation loss and high production cost of fillers used in carbon material calcination in existing technologies, this invention provides a filler for carbon material calcination and its preparation method, aiming to improve the oxidation resistance of the filler medium and reduce production costs during the carbon material calcination process.

[0005] The technical problem solved by this invention is achieved by the following technical solution:

[0006] The purpose of this invention is to provide a filler for calcining carbon materials, comprising graphitized coke, calcined coke and silicon dioxide.

[0007] Graphitized coke, as an auxiliary material in the graphitization production process, is mainly used as a heat insulation material and resistance material in the graphitization process. In China, the output of graphitized coke is very high, but its uses are very limited. Apart from a small portion that can be used as a carbon raiser, most of the graphitized coke is idle. The accumulation of these materials not only ties up the company's funds, but also represents a huge waste of resources.

[0008] The inventors have discovered that using a mixture of graphitized coke, silicon dioxide, and calcined coke to produce filler for carbon material roasting can achieve resource integration and complementary advantages, solving the problems of high price and low cost-effectiveness of metallurgical coke. Importantly, it improves the oxidation resistance and thermal conductivity of the filler medium, thereby increasing the user's production efficiency, the pass rate of roasted products, and the product quality. Furthermore, the graphitized coke used has been subjected to a high temperature of 3000℃, resulting in lower ash content. As a filler for carbon material roasting, it not only reduces the enterprise's production costs but also solves the problem of solid waste accumulation.

[0009] Furthermore, the raw materials of the filler are, by weight percentage, 55-80% graphitized coke, 10-20% calcined coke, and 10-25% silicon dioxide.

[0010] Furthermore, the particle size of graphitized coke is 5-15 mm, the particle size of calcined coke is 2-8 mm, and the particle size of silica is 5-10 mm.

[0011] Furthermore, in graphitized coke, particles with a size of 4-8 mm account for 10-50%, and particles with a size of 8-15 mm account for 50-90%.

[0012] A method for preparing a filler for calcining carbon materials includes the following steps:

[0013] Step 1: Sieving: The graphitized coke is sieved into different particle sizes;

[0014] Step 2: Prepare graphitized coke mixture: Weigh the graphitized coke according to different particle sizes and their respective weight percentages, and then put the weighed raw materials into a mixing device for mixing to obtain the graphitized coke mixture.

[0015] Step 3: Stir-frying the raw materials: Stir-fry the silica raw materials to remove impurities and moisture, and obtain silica raw materials for later use;

[0016] Step 4: Prepare silica mixture: Weigh the silica stock and calcined coke separately, and put them into a mixing device for mixing to obtain silica mixture;

[0017] Step 5: Finished product: After mixing the graphitized coke mixture and the silica mixture in a mixing device, the final product is the filler material for calcination.

[0018] Graphitized coke is highly suitable as a filler material in the roasting process of carbon materials due to its low ash content, good thermal conductivity, and low price. Silica, on the other hand, has high hardness, excellent oxidation resistance, stable chemical properties, and good wear resistance. The calcined coke is calcined petroleum coke. Compared to traditional metallurgical coke, the carbon material roasting filler material of this invention offers significant improvements in indicators and quality. It has lower ash content, good thermal conductivity, is less prone to coking, and has good fluidity, greatly reducing oxidation loss and production costs, and improving user production efficiency. Furthermore, it reduces the environmental impact of harmful gases such as carbon monoxide and carbon dioxide produced by the oxidation of the filler material.

[0019] Furthermore, the mixing time in steps two, four, and five is 10-20 minutes.

[0020] Furthermore, in step three, the temperature for stir-frying the silica raw material is 200-300℃.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0022] 1. The carbon material roasting filler of this invention is composed of 55-80% graphitized coke (particle size 5-15mm), 10-25% silica (particle size 5-10mm), and 10-20% calcined coke (particle size 2-8mm). Compared with the existing method of roasting carbon raw products using metallurgical coke, the raw products roasted by this invention have significantly improved performance indicators and quality. It not only shortens the roasting time and improves the user's production efficiency, but also reduces the ash content of the product, reduces the oxidation loss of the carbon material roasting filler, improves the thermal conductivity of the filler material, and ensures uniform heating of the raw product during the heating process, reducing the risk of cracking caused by uneven heating without increasing impurities. This reduces the user's production costs.

[0023] 2. The carbon material calcination filler of the present invention can shorten the calcination time by 24-40 hours, reduce the oxidation loss of the filler to 2-5 kg / tC, and reduce the overall cost of carbon product production by about 30 yuan. Based on an enterprise producing 100,000 tons of carbon products per year, the annual production cost savings are 3 million yuan.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above contents, objectives, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are described below. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0026] In addition, unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be obtained by purchasing them from the market or prepared by existing methods.

[0027] Example 1

[0028] After sieving, graphitized coke is weighed at a ratio of 10% by weight for particles of 4-8mm and 90% by weight for particles of 8-15mm. The weighed raw materials are then placed in a mixing device and stirred for 10-20 minutes to obtain a graphitized coke mixture. Next, silica raw materials with a particle size of 5-10mm are stir-fried at 200 degrees Celsius to remove some impurities and moisture, yielding a silica reserve. 25% by weight of the silica reserve and 20% by weight of calcined petroleum coke with a particle size of 2-8mm are weighed and mixed for 10-20 minutes to obtain a silica mixture. This silica mixture is then mixed with 55% of the above-mentioned graphitized coke mixture for 10-20 minutes to obtain a calcination filler. Through calcination experiments over 8 calcination cycles, the oxidation loss of this calcination filler is 3 kg / t·C, and fuel consumption per ton can be reduced by approximately 14%.

[0029] Example 2

[0030] After sieving, graphitized coke is weighed at a ratio of 30% by weight for particles of 4-8mm and 70% by weight for particles of 8-15mm. The weighed raw materials are then placed in a mixing device and stirred for 10-20 minutes to obtain a graphitized coke mixture. Next, silica raw materials with a particle size of 5-10mm are stir-fried at 250 degrees Celsius to remove some impurities and moisture, yielding a silica reserve. 15% by weight of the silica reserve and 10% by weight of calcined petroleum coke with a particle size of 2-8mm are weighed and mixed for 10-20 minutes to obtain a silica mixture. This silica mixture is then mixed with 75% by weight of the aforementioned graphitized coke mixture for 10-20 minutes to obtain a calcination filler. Through calcination experiments over 8 calcination cycles, the oxidation loss of this calcination filler is 5 kg / t·C, and fuel consumption per ton can be reduced by approximately 11%.

[0031] Example 3

[0032] After sieving, graphitized coke is weighed at a ratio of 40% by weight for particles of 4-8mm and 60% by weight for particles of 8-15mm. The weighed raw materials are then placed in a mixing device and stirred for 10-20 minutes to obtain a graphitized coke mixture. Next, silica raw materials with a particle size of 5-10mm are stir-fried at 230 degrees Celsius to remove some impurities and moisture, yielding a silica reserve. 20% by weight of the silica reserve and 15% by weight of calcined petroleum coke with a particle size of 2-8mm are weighed and mixed for 10-20 minutes to obtain a silica mixture. This silica mixture is then mixed with 65% of the aforementioned graphitized coke mixture for 10-20 minutes to obtain a calcination filler. Through calcination experiments over 8 calcination cycles, the oxidation loss of this calcination filler is 5 kg / t·C, and fuel consumption per ton can be reduced by approximately 13%.

[0033] Example 4

[0034] After sieving, graphitized coke is weighed at a ratio of 50% by weight for particles of 4-8mm and 50% by weight for particles of 8-15mm. The weighed raw materials are then placed in a mixing device and stirred for 10-20 minutes to obtain a graphitized coke mixture. Next, silica raw materials with a particle size of 5-10mm are stir-fried at 260 degrees Celsius to remove some impurities and moisture, yielding a silica reserve. 15% by weight of the silica reserve and 15% by weight of calcined petroleum coke with a particle size of 2-8mm are weighed and mixed for 10-20 minutes to obtain a silica mixture. This silica mixture is then mixed with 70% of the above-mentioned graphitized coke mixture for 10-20 minutes to obtain a calcination filler. Through calcination experiments over 8 calcination cycles, the oxidation loss of this calcination filler is 4 kg / t·C, and fuel consumption per ton can be reduced by approximately 12%.

[0035] Example 5

[0036] After sieving, graphitized coke is weighed at a ratio of 20% by weight for particles of 4-8mm and 80% by weight for particles of 8-15mm. The weighed raw materials are then placed in a mixing device and stirred for 10-20 minutes to obtain a graphitized coke mixture. Next, silica raw materials with a particle size of 5-10mm are stir-fried at 290 degrees Celsius to remove some impurities and moisture, yielding a silica reserve. 10% by weight of the silica reserve and 10% by weight of calcined petroleum coke with a particle size of 2-8mm are weighed and mixed for 10-20 minutes. This mixture is then combined with 80% of the above graphitized coke mixture and stirred for another 10-20 minutes to obtain the roasting filler. Through roasting experiments over eight roasting cycles, the oxidation loss of this roasting filler is 5 kg / t·C, and fuel consumption per ton can be reduced by approximately 13%.

[0037] Comparative Example 1:

[0038] The metallurgical coke particles with a particle size of 2-10 mm account for approximately 70% of the total weight, the calcined coke with a particle size of 2-8 mm accounts for 18% of the total weight, and the graphitized coke with a particle size of 0-2 mm accounts for 12% of the total weight.

[0039] Comparative Example 2:

[0040] The metallurgical coke particles with a particle size of 2-10 mm account for approximately 65% ​​of the total weight, the calcined coke with a particle size of 2-8 mm accounts for 24% of the total weight, and the graphitized coke with a particle size of 0-2 mm accounts for 11% of the total weight, and are mixed evenly.

[0041] Comparative Example 3:

[0042] The metallurgical coke particles with a particle size of 2-10 mm account for approximately 65% ​​of the total weight, the calcined coke with a particle size of 2-8 mm accounts for 25% of the total weight, and the graphitized coke with a particle size of 0-2 mm accounts for 15% of the total weight.

[0043] The filler materials of Examples 1-5 and Comparative Examples 1-3 were used in the calcination of carbon materials, and the calcination process and the produced carbon materials were tested and statistically analyzed. The comparison results are shown in the table below:

[0044]

[0045] Experiments have shown that the carbon material calcination filler of this invention can shorten the calcination time by 24-40 hours, reduce the oxidation loss of the filler to 2-5 kg / tC, and reduce the overall cost of carbon product production by about 30 yuan. For a company producing 100,000 tons of carbon products per year, this translates to an annual saving of 3 million yuan in production costs.

[0046] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0047] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and these forms are all within the protection scope of the present invention.

Claims

1. A filler for calcining carbon materials, characterized in that, This includes graphitized coke, calcined coke, and silicon dioxide; The raw materials for the filler, by weight percentage, are 55-80% graphitized coke, 10-20% calcined coke, and 10-25% silicon dioxide; The particle size of graphitized coke is 5-15 mm, the particle size of calcined coke is 2-8 mm, and the particle size of silica is 5-10 mm. In graphitized coke, particles with a size of 8-15mm account for 50-90%.

2. The method for preparing a filler for calcining carbon materials as described in claim 1, characterized in that: Includes the following steps: Step 1: Sieving: The graphitized coke is sieved into different particle sizes; Step 2: Prepare graphitized coke mixture: Weigh the graphitized coke according to different particle sizes and their respective weight percentages, and then put the weighed raw materials into a mixing device for mixing to obtain the graphitized coke mixture. Step 3: Stir-frying the raw materials: Stir-fry the silica raw materials to remove impurities and moisture, and obtain silica raw materials for later use; Step 4: Prepare silica mixture: Weigh the silica stock and calcined coke separately, and put them into a mixing device for mixing to obtain silica mixture; Step 5: Finished product: After mixing the graphitized coke mixture and the silica mixture in a mixing device, the final product is the filler material for calcination.

3. The method for preparing a filler for calcining carbon materials as described in claim 2, characterized in that: The mixing time in steps two, four and five is 10-20 minutes.

4. The method for preparing a filler for calcining carbon materials as described in claim 2, characterized in that: In step three, the temperature for stir-frying the silica raw material is 200-300℃.

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