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Waste refractories in the steel industry
In each production process of iron and steel enterprises, a large amount of waste refractory materials will be generated, such as the daily repair of furnaces in iron and steel smelting, and the waste refractory materials removed from the medium repair and overhaul of ladles and ladles. At present, the total annual waste of refractory materials in my country continues to rise. These waste refractory materials not only lead to a large amount of waste of resources, but also increase the production and processing costs of iron and steel enterprises, and also cause pollution to the environment. As the pressure of steel cost continues to increase, the recycling and reuse of waste refractory materials has been valued by iron and steel enterprises. By processing the waste refractory materials in terms of technology, new products with industrial value can be obtained.
Exploration on the application of waste refractories in the iron and steel industry
01 Waste refractory materials should be classified and recycled
There are many kinds of waste refractory materials in the iron and steel industry, and their components are complex. In order to maximize the rational utilization of different waste refractory materials, it is necessary to carry out classification research according to the chemical properties, production methods and supply forms of waste refractory materials. Iron and steel enterprises sort and crush various waste refractory materials through uniform recycling of waste high-alumina bricks, magnesia bricks for furnace wall masonry, slide plates for molten iron tank mouths, waste castables for ferroalloy smelting furnaces, and ladle castables. , according to the magnesia series, alumina series, carbon-containing series, carbon-free series, etc., and the mixed dissimilar materials or iron sheets must be separated by magnetic separation and other methods. It can roughly form different material products such as waste magnesia carbon bricks, waste aluminum magnesia carbon bricks, waste aluminum silicon carbide bricks, waste magnesia bricks, magnesia chrome bricks, waste high alumina bricks (including mullite and corundum bricks), these products It can be directly used for the production material demand of individual factories of iron and steel enterprises.
02 New refractory materials should be added according to the ratio
After the waste refractory materials in the iron and steel industry have been screened, they can also be mixed with new refractory materials for in-depth recycling and processing, and then processed into new refractory products through extrusion molding, melting casting or pouring molding, etc. In order to meet the different needs of using refractory materials in other processes, reduce the cost of refractory material preparation in the production and operation of iron and steel enterprises. At present, quite a lot of exploration has been carried out in terms of the mixing method of materials, and certain achievements have been made in the aspects of regenerating dense refractory aggregates and using chemical reagents to separate recycled aggregates, making many types of Waste refractory materials can be fully recycled and applied by adding new materials. However, in the future development process, it is necessary to further promote the comprehensive application of waste refractory materials, improve the added value and technological level of recycled products, so as to make the application range of waste refractory materials wider and reduce the environmental impact of refractory solid waste. pollute.
03Improve the recycling technology of waste refractory materials
A large number of practices have shown that improving the technology and application level of waste refractory materials, on the one hand, can improve the characteristics of corrosion resistance and wear resistance of recycled waste refractory materials, effectively improve the quality of waste refractory material reproduction, and reduce the loss of refractory materials. It can optimize the recycling of waste refractories; on the other hand, it can also be widely used in blast furnace ironmaking, hot metal pretreatment, out-of-furnace refining, and converter steelmaking, which not only reduces production risks, but also effectively Improve the output and quality of iron and steel metallurgy. Therefore, in order to strengthen the application of waste refractory materials in the iron and steel industry, it is not only necessary to classify and comprehensively utilize various types of refractory materials, but also to pay attention to the recycling technology of waste refractory materials, and carry out technical and technical research on the residual lining of different types of refractory castables. processing applications. For example, comprehensive recycling technologies such as CTG-2A ramming material for main ditch joints, aluminum carbon bricks for steelmaking splash guards, and the middle part of CAS dipping pipes can effectively improve the performance of high value-added products of different waste refractory materials, and make the comprehensive recycling of waste refractory materials Recycling can fully meet the technological requirements of the steel industry.
epilogue
To sum up, waste refractories, as a renewable resource, can effectively reduce the production cost of the iron and steel industry, promote environmental protection and the sustainable development of iron and steel enterprises, thereby improving the economic and social benefits of the production and operation of the iron and steel industry. At present, the application of waste refractory materials in the iron and steel industry has reached a certain scale, such as waste iron trench materials and waste magnesia carbon bricks, which have gradually been comprehensively recycled. At the same time, in the future development of the steel industry, the application and recycling of waste refractory materials should be maximized, the high value-added steel products produced with waste refractory materials as raw materials should be continuously improved, and other applications of waste refractory materials should be further developed Way.