Converter slag tank separating agent

Abstract

The invention discloses a converter slag tank separating agent. The slag ladle separating agent is prepared by mixing converter casting residue ladle water sediment and blast furnace water slag storage yard sediment according to the mass ratio of 1: (1-3). When in use, the converter casting residue tank water sediment and the blast furnace water slag storage yard sediment are mixed in proportion to obtain a mixture, water accounting for 45-55% of the mass of the mixture is added, the mixture is uniformly stirred to obtain slurry, the slurry is uniformly sprayed on the inner wall of the slag tank by using a pressurized spraying device, and the slurry is dried. The slag ladle separating agent provided by the invention can solve the defects of the traditional slag ladle separating agent in the aspects of cyclic utilization, high temperature resistance and adhesion, realizes the recycling of steel slag dust and mud, reduces the production cost, further solves the prominent problems of difficult treatment and utilization of steel slag dust and mud and the like, maximally avoids the risk of environmental pollution, and has good economic benefits and social benefits. The resource comprehensive utilization of the industrial solid waste is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical auxiliary materials, and in particular relates to a converter slag pot separator. Background Art

[0002] In the converter steelmaking production process, the smooth or natural separation of slag and slag pot is an important link to ensure the normal converter smelting. Before the converter slag pot is used, the slag pot separator needs to be sprayed on the inner wall of the slag pot in advance to reduce and avoid the molten steel slag adhering to the slag pot during the cooling process, causing the volume of the slag pot to gradually decrease, affecting the converter production operation, and being forced to take abnormal operation methods such as crane lifting slag pot collision emergency disposal. The collision operation often aggravates the damage and shutdown of the slag pot and affects the service life of the slag pot. Traditional slag pot separators have high procurement costs. Although they have certain high temperature resistance, adhesion and isolation effects, a small amount of molten steel will inevitably exist in the molten slag, especially at the bottom of the slag pot, making the separation effect of the spraying agent not ideal, which not only affects production efficiency, but also increases production costs.

[0003] The invention aims to provide a slag pot separator which takes industrial waste converter casting slag belt pot water sediment and blast furnace slag yard sediment as main raw materials. Summary of the invention

[0004] The object of the present invention is to provide a converter slag pot separator.

[0005] The object of the present invention is achieved in this way. A converter slag pot separation is prepared by mixing the converter casting slag belt pot water sediment and the blast furnace slag yard sediment in a mass ratio of 1:1-3.

[0006] The sediment of the converter casting slag tank with water is mainly steel slag dust mud. The casting slag is a slag with silicate and ferrite as the main components, and the melting point ranges from 1300 to 1400℃. According to the principle of metallurgical similarity, the material has excellent high temperature resistance and can maintain stable performance in high temperature and harsh environment. At the same time, according to the steel smelting principle of slag making slag, the material can effectively isolate the erosion of the slag tank wall by the molten slag, and can effectively prevent the slag tank wall from being melted through by the molten slag.

[0007] The deposits in the blast furnace slag yard are mainly blast furnace slag dust mud. Blast furnace slag is a granular slag obtained by rapid cooling of blast furnace molten slag in water or by rapid cooling under the combined action of machinery and water. Blast furnace slag is the main material for producing silicate cement. Therefore, this material has good hydraulic gelling effect, which can quickly condense the deposits of converter casting slag with water tank, so that it forms an isolation layer that is easy to separate the steel slag and the slag tank. During the separation process, as the molten steel slag is added to the slag tank and the temperature of the inner wall of the slag tank increases, this isolation layer can easily fall off the slag tank wall, thereby realizing the rapid and effective separation of the steel slag and the slag tank.

[0008] When in use, the novel slag pot separator of the present invention is evenly sprayed on the inner wall of the slag pot. As production proceeds, the steel slag in the slag pot will gradually adhere to the separator to form an isolation layer. When the slag pot is emptied, the steel slag and the separator can be discharged together to achieve rapid and effective separation of the steel slag from the slag pot. After being processed by the tank pumping process, the slag pot separator is returned to the sedimentation tank, thereby achieving recycling.

[0009] The beneficial effects of the present invention are as follows: the sediments from the water pumping tank of the converter casting slag and the sediments from the blast furnace slag yard are both metallurgical solid wastes. These sediments are difficult to separate and utilize effectively, which not only causes scaling and blockage of pipeline equipment and facilities, affecting the service life and smooth production, but also these sediments are mixed with waste refractory materials and discharged together, posing a more prominent potential risk of environmental pollution. By implementing a series of measures such as separation, collection, and concentration of the sediments, the sediments can be recycled and utilized, thereby replacing the existing slag pot separators, reducing production costs, and further resolving the environmental pollution risks caused by long-term open-air storage of sediments in society. After use, the slag pot separator provided by the present invention can also be returned to the sedimentation tank through the water pumping process, thereby achieving recycling.

[0010] The slag pot separator provided by the present invention can solve the deficiencies of traditional slag pot separators in terms of recycling, high temperature resistance and adhesion, realize the recycling of steel slag dust and mud, reduce production costs, and at the same time further resolve prominent problems such as the difficulty in disposing and utilizing steel slag dust and mud, avoid environmental pollution risks to the greatest extent, and realize the comprehensive resource utilization of industrial solid waste.

[0011] The slag pot separator provided by the present invention can improve the turnover rate and supply guarantee capacity of the slag pot, reduce the slag pot collision rate from 6.5% to 3.8%, increase the one-time pot turnover rate from 93.5% to 96.2%, and the single pot cleaning time is within 30 minutes when the slag pot is bonded. It can meet the needs of fast-paced converter smelting production, and has important practical significance and broad market prospects. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with the embodiments, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0013] The invention provides a converter slag pot separator, which is prepared by mixing converter casting slag belt pot water sediment and blast furnace slag yard sediment in a mass ratio of 1:1-3.

[0014] The converter casting slag with water in a tank sediment is the part with a particle size of 0.150±0.020mm obtained by sieving the converter casting slag with water in a tank sediment, and its components are: SiO215~20%, Al2O35~10%, MgO 3~8%, CaO 25~30%; the particle size of the converter casting slag with water in a tank sediment is 0.150±0.020mm.

[0015] The components of the blast furnace slag yard sediment are: SiO2 30-35%, Al2O3 10-15%, MgO 5-10%, and CaO 30-40%; the particle size of the blast furnace slag yard sediment is 0.075±0.05mm.

[0016] The present invention also provides a method for using the converter slag pot separator, specifically, mixing the water sediment from the converter casting slag pot and the water sediment from the blast furnace slag yard in proportion to obtain a mixture, adding 45-55% water by mass of the mixture and stirring evenly to obtain a slurry, and then using a pressurized spraying device to evenly spray the slurry on the inner wall of the slag pot, and then drying it.

[0017] The spraying thickness of the slag pot separator is 30-40μm.

[0018] The drying method is slag pot waste heat drying or natural drying.

[0019] Example 1 The sediment from the converter slag tank and the sediment from the blast furnace slag yard sedimentation tank are mixed in a ratio of 1:1 to obtain a mixture, and a slag tank separator is obtained by adding % of the mass of the mixture.

[0020] When in use, a pressurized spraying device is used to evenly spray the slag pot separator on the inner wall of the slag pot with a spray thickness of 30-40μm, ensuring that the coating can fully cover the entire inner surface of the slag pot. After spraying, the residual heat of the slag pot and natural drying methods can be used to ensure that the spray layer is completely dry. As production proceeds, the steel slag in the slag pot will gradually adhere to the separator to form an isolation layer. When the slag pot is emptied, the steel slag and the separator can be discharged together to achieve a quick and effective separation of the steel slag and the slag pot. After the slag pot separator is processed by the water pumping process, it is returned to the sedimentation tank for recycling. Because the slag pot separator is made of solid waste, the amount of the separator can be ignored and it can be sprayed after each can turning. After using this slag pot separator, the one-time can turning rate is 96.2%, and the single can cleaning time when the slag pot is bonded is 15 minutes.

[0021] Example 2 The sediment from the converter casting slag tank and the sediment from the blast furnace slag yard sedimentation tank are mixed in a ratio of 1:2 to obtain a mixture, and 50% of the water by mass of the mixture is added and stirred to obtain a new slag tank separator. When in use, the new slag tank separator is evenly sprayed on the inner wall of the slag tank using a pressurized spraying device with a spraying thickness of 30-40μm to ensure that the coating can fully cover the entire inner surface of the slag tank. After spraying, the slag tank waste heat is used to dry it, and production can be carried out after ensuring that the spray layer is completely dry.

[0022] After using the slag pot separator of this embodiment, the one-time pot turning rate is 94.8%, and the single pot cleaning time when the slag pot is stuck is 25 minutes.

[0023] Example 3 The sediment from the water pumping tank of the converter casting slag and the sediment from the sedimentation tank of the blast furnace slag yard are mixed in a ratio of 1:3 to obtain a mixture, and 55% of the mass of water of the mixture is added for stirring to obtain the new slag pot separator of the present invention. The slag pot separator is evenly sprayed on the inner wall of the slag pot using a pressurized spraying device with a spraying thickness of 30-40μm to ensure that the coating can fully cover the entire inner surface of the slag pot. After the spraying is completed, the slag pot can be dried using the residual heat of the slag pot before production can be carried out. After using the present slag pot separator, the one-time can turning rate is 94.3%, and the single can cleaning time is 30 minutes when the slag pot is bonded.

[0024] In the slag pot separation process of a certain steel enterprise, the novel slag pot separator of the present invention was used for testing. The results show that compared with the traditional slag pot separator, the separator of the present invention has obvious advantages in terms of recyclability, high temperature resistance and adhesion. However, the use of an externally purchased slag pot separator for spraying and operating the slag pot consumes 1.2 yuan per ton of steel, and the annual consumption is as high as more than 3 million yuan. The use of the novel slag pot separator of the present invention can reduce such procurement costs.

Claims

1. A converter slag pot separator, characterized in that: The slag pot separator is prepared by mixing the water sediment of the converter casting slag pot and the water slag yard sediment of the blast furnace in a mass ratio of 1:1-3.

2. The converter slag pot separator according to claim 1, characterized in that: The converter casting slag with water in a tank sediment is the part with a particle size of 0.150±0.020mm obtained by sieving the converter casting slag with water in a tank sediment, and its components are: SiO215-20%, Al2O3 5-10%, MgO 3-8%, CaO 25-30%; the particle size of the converter casting slag with water in a tank sediment is 0.150±0.020mm.

3. The converter slag pot separator according to claim 1, characterized in that: The components of the blast furnace slag yard sediment are: SiO2 30-35%, Al2O3 10-15%, MgO 5-10%, CaO 30-40%; the particle size of the blast furnace slag yard sediment is 0.075±0.05mm.

4. The method for using the converter slag pot separator according to claim 1, characterized in that: Mix the water sediment from the converter slag tank and the blast furnace slag yard in proportion to obtain a mixture, add 45-55% water of the mixture mass and stir evenly to obtain a slurry, use a pressurized spraying device to evenly spray the slurry on the inner wall of the slag tank and dry it.

5. The method for using the converter slag pot separator according to claim 4, characterized in that: The spraying thickness of the slag pot separator is 30-40μm.

6. The method for using the converter slag pot separator according to claim 4, characterized in that: The drying method is slag pot waste heat drying or natural drying.