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Explanation of environmental protection measures during the blast furnace ironmaking process

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Abstract: In order to reduce the pollution caused by blast furnace ironmaking to the atmospheric environment, research on environmental protection measures during the blast furnace ironmaking process was carried out. By analyzing the blast furnace ironmaking process and the harm it causes to the environment, environmental protection measures such as recycling the heat generated during the blast furnace ironmaking process, reusing blast furnace ironmaking waste slag solids, and introducing improved environmental protection devices to replace traditional devices are proposed. Use science and technology in the production process as support to fully implement environmentally sustainable development in the steel production industry.

Keywords: blast furnace ironmaking process; environmental protection measures; atmospheric environmental pollution; waste gas; solid; heat

In the context of social development where market industrialization continues to progress, more and more industries are paying attention to the problem of ecological environment being polluted by industrial development. In particular, the greenhouse effect pollution caused by carbon dioxide gas emissions to the atmospheric environment has led to the weakening of the ecosystem’s recycling capacity. According to incomplete market statistics at this stage, the pollutants emitted into the atmosphere by steel-related industries during the production process account for 15.0% of the pollutants emitted during the production process of the global industrial industry. Therefore, there is reason to believe that controlling pollutant emissions during the production process of steel-related industries can alleviate social pollution problems to a certain extent. In the steel industry, blast furnace ironmaking is its main production process, which mainly refers to the mixing of iron ore and smelting reagents. After thoroughly mixing it according to a certain proportion, it is placed in a resin reaction device. In this way, liquid pig iron can be produced continuously and efficiently. Up to now, blast furnace ironmaking is still the main way to produce steel resources in my country. Compared with other methods of producing steel in the industry, this method produces a relatively large amount of liquid pig iron per unit time and has high production efficiency. In the current market More than 90.0% of pig iron is produced in this way. However, based on the continuous development of social science and technology and the continuous improvement of industrial policies, the environmental pollution issues related to the blast furnace ironmaking process have attracted the attention of the national and local governments. Moreover, in a social context where people’s thoughts and cognition are constantly improving, production units are paying more and more attention to the use of environmentally friendly materials in the production process, and hope that in this way, they can reduce the pollutants emitted during the blast furnace ironmaking process. In this study, this article will also delve into the research and analysis of the blast furnace ironmaking process, and elaborate on the corresponding environmental protection measures based on the actual needs of the process. In this way, various environmental pollution problems existing in the production of the steel industry are solved.

Analysis of blast furnace ironmaking process

Figure 1 Blast furnace ironmaking process flow

The blast furnace ironmaking production process is a relatively complex process. During the smelting process, it not only involves the feeding management of the blast furnace device, but also needs to control the air supply, purification, material supply and other processes in production. Under normal circumstances, in the blast furnace ironmaking process, the proportion of funds invested in the blast furnace body accounts for about 20%, and the proportion of funds invested in other auxiliary links accounts for about 80%. Multiple production links are closely connected and cooperate with each other to form a relatively complete production process. The blast furnace ironmaking process flow is as shown in Figure 1 above. The production raw materials are loaded into the blast furnace through the main body feeding device. This device has a certain degree of sealing and can effectively prevent gas leakage. After the raw materials are evenly distributed in the blast furnace, production operations begin between multiple structures, so that the output of pig iron can be achieved.

Harm to the environment caused by the blast furnace ironmaking process

Our country is a major iron-making country in the world. Although the amount of pig iron produced every year can meet the needs of industrial production, in-depth research on the industry has found that there are still many internal contradictions in the implementation of the blast furnace iron-making process. Nowadays, The most significant contradiction is: the pollution caused by production behavior to the environment and the contradiction between the sustainable development of the ecological environment. Driven by high and new technologies, the structure of blast furnace ironmaking equipment has become more sophisticated, but at the same time, some small production equipment with relatively backward technical levels also coexist in the market. This hierarchical development of the industry is seriously restricting the development of the industry. .

At the same time, a comprehensive in-depth study of the blast furnace ironmaking process found that the energy consumed by China’s steel industry accounts for 15.0% to 25.0% of the market’s industrial production energy consumption, and the wastewater discharged during the production process accounts for 14.0% of the total industrial production wastewater discharge. %. In addition, during production, the factory will also discharge or accumulate a large amount of waste slag. If these industrial waste slags are not processed promptly and effectively in the factory, volatilization will occur. Including, particulate dust, sulfur dioxide, carbon dioxide and other pollutants in the atmosphere are caused by the dust and volatilization of waste residue.

Compared with other industries in industrial production, the steel production industry emits more waste gas and slag, which causes greater environmental pollution. When these pollutants enter urban areas, people inhale particulate dust, which will pose a threat to the human respiratory system and, in severe cases, threaten human health. In addition, when these pollutants flow into the river, organisms and microorganisms in the water are affected by industrial pollution, die in large numbers, and even some biological species mutate. Therefore, there is reason to believe that the blast furnace ironmaking process has very significant harm to the social ecological environment and atmospheric environment.

Environmental protection measures during the blast furnace ironmaking process

Recycle the heat generated during the blast furnace ironmaking process

In order to reduce the pollution caused by the blast furnace ironmaking process to the atmospheric environment and the social and ecological environment, the heat generated in the blast furnace ironmaking production can be recycled during the production process. In this way, the fuel and resources consumed by ironmaking can be effectively solved. In the current industrial industry, increasing research on heat recycling has become a key project in industrial science and technology research and development. Under normal circumstances, the methods of recycling heat can be divided into two ways. One is to recover the heat generated by the flue gas during blast furnace production, and the other is to recover the heat generated from the slag in the furnace after production. The former behavior can occur after the feeding device completes its operation. When the imported raw materials are fully burned in the blast furnace, the flue gas heat can be recovered. Under such conditions, the temperature in the blast furnace is approximately 350.0℃. After the heat is recovered, the heat can be used in the heating process of iron ore. This step can save a certain amount of re-burning resources. In addition, after the heat recovery treatment of the slag material in the furnace, the heat needs to be processed twice, and the remaining heat is used to continuously heat it to 1000.0°C. The heat at this time can be smelted and reprocessed.

Based on the above analysis, during the blast furnace ironmaking process, recycling the heat produced can not only save the fuel consumed by multiple sintering of raw materials, but this behavior also meets the requirements of my country’s sustainable development strategy for industrial production. Therefore, it can be considered that recycling the heat generated during the blast furnace ironmaking process can save resources. In addition, in the process of repeated use of caloric flue gas, the number of flue gas emissions is reduced, which solves the problem of part of the flue gas polluting the atmospheric environment, and is in line with the low-carbon principle in the construction and development of market economy.

Reuse of blast furnace ironmaking waste solids

The blast furnace ironmaking process not only produces a large amount of toxic and harmful gases, but also produces a large amount of waste metal residue. In the early days, the level of blast furnace ironmaking in my country was poor, and production units were unable to use existing technology to recycle these waste materials. They only accumulated and stored the waste slag and waste materials after completing the production of pig iron. However, after the production technology was gradually improved, the production unit discovered that the slag produced by blast furnace ironmaking contained a large amount of metal substances. Most of the metal substances could be converted into independent metals after later purification. Or the produced slag can be recycled and reused directly in blast furnace ironmaking. At present, the technology for recycling solid slag is relatively mature. A common recycling method is to heat the solid slag. When the temperature in the furnace reaches a certain temperature, the solid slag will undergo a gasification reaction. At this time, the waste slag gas is extracted. This method can not only improve the utilization rate of steel resources. At the same time, it also reduces the emission of solid pollutants to a certain extent, achieving energy conservation and emission reduction in blast furnace ironmaking in a true sense.

Introduce improved environmental protection devices to replace traditional devices

After completing the above related research, it can be seen that in order to solve the pollution of the atmospheric environment caused by the blast furnace ironmaking process at the root or source, it is necessary to use scientific technology from the production process level to improve production behavior and according to industrial production needs , timely update some outdated blast furnace equipment in the factory, introduce improved environmental protection devices to replace traditional production devices, and reduce pollutant emissions. According to long-term research by blast furnace equipment production units, it was found that the content of pollutants emitted by large-scale production equipment during the pig iron production process is much lower than the content of pollutants emitted by small-scale production equipment during the pig iron production process. Therefore, in the in-depth design work in this area, the method of expanding the scale of industrial production can be used to make the blast furnace smelting equipment show a large-scale development trend. On this basis, a new type of cyclone dust collector can be installed on large equipment, integrating the advantages of early gravity dust removal methods and dry purification dust removal methods, and combining the structure of Shofta equipment to design a new dust removal device. This device uses a cyclone structure and a Daiwei bell water purification structure, which can realize the discharge of gases discharged from blast furnace production after multi-layer purification. For example, sulfur dioxide and dust generated in blast furnace production will be adsorbed on the inner wall of the device structure when passing through the cyclone structure. When a large number of fine structures accumulate, the dust will be solidified. At this time, you only need to clean the inner wall of the equipment after completing the production of pig iron to obtain solid dust pollutants. Compared with gas pollutants, the management of solid pollutants is simpler. During this process, some pollutants that have not been completely purified will continue to pass through the Daiwei Zhong water purification structure, and the distilled water will further wash the pollutants. After the effective purification of pollutants is completed, the gaseous pollutants can be converted into solid pollutants by standing distilled water and filtering it. At this time, according to the content of substances in the solid slag, metal purification treatment can be performed to solve most of the pollutants produced during the blast furnace ironmaking process. Compared with the environmental protection measures traditionally used in the market, the proposed method not only reduces the cost of dust removal of air pollutants, but also enables the recycling of multiple substances.

In addition to the measures proposed above, corrosion inhibition methods can also be used to precipitate solid pollutants during the blast furnace ironmaking process. For example, anti-corrosion materials and reagents are applied to the inner wall of the dust removal pipe, and the thickness of the coating film is controlled within the range of 40.0mm~55.0mm. In this way, large equipment is prevented from being corroded by pollutants during use and shortening its service life. On this basis, a cloth bag is placed at the gas outlet, and lime water is sprayed on the bag, so that the discharged pollutant gas can chemically react with the lime water at the air outlet. At this time, the cloth bag at the exit position is connected to the desulfurization device, so that the terminal forms a simple sedimentation tank, and the pollutants can precipitate in the reaction tank. This method can not only solve the problem of corrosion of blast furnace production equipment, but also achieve secondary recovery of slag. In short, to fully implement environmental protection during the blast furnace ironmaking process, it is also necessary to support science and technology in the production process, so as to effectively solve the problem of atmospheric environmental pollution.

Conclusion

This article elaborates on the environmental protection measures in the blast furnace ironmaking process from three aspects, and hopes that through this research, we can solve the pollution problem caused by industrial production to the social and ecological environment and achieve the sustainable construction of the atmospheric environment and ecological environment. However, research related to this aspect is not accomplished overnight. Instead, it is necessary to continue to explore the shortcomings of existing technologies in later production, in this way, to ensure that industrial production develops in a green direction.

LMM YOTAI established in 2007. Our production technology comes from Japanese Yotai. As an experienced and international player in the refractories industry. We have succeeded in expanding both the breadth of its product range and the depth of its services. From raw material selection, refractory portofio & optimization, installation & services & recycle of used refractories on site to further reduce client’s Opex & Capex in refractory consumption per ton steel output, meanwhile improve product quality of client.

Our Product have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, EZZ steel etc. We do OEM for Concast and Danieli for a long time

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