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Iron blast furnaces[edit]Blast furnaces are still an important part of modern ironmaking production. Modern furnaces are very effaicient, including Cowper furnaces for preheating the blast and employing recovery systems to extract heat from the hot gases exiting the furnace. Industry competition dri
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In order to homogenize the composition and temperature, the gas stirring process in the ladle appeared. The most striking is the adoption of secondary refining, which greatly improves the output and quality of steel. However, what is the main task and purpose of secondary refining? The composition of molten steel, decarburization, deslagging and refining of molten steel shall be adjusted according to the target of molten steel, molten steel melting, deslagging and refining.
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Secondary refining refers to the refining outside the traditional steelmaking furnace (such as open hearth furnace, refining furnace and electric furnace). The main tasks of refining are deoxidation, desulfurization, dephosphorization, decarburization, inclusion removal, alloying and fine adjustment of composition. Statistics on the world crude steel output show that the world crude steel output has continued to grow in ups and downs in the past 30 years.
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Development of secondary refining technologyThe secondary refining has the functions of making the temperature and composition of the molten steel uniform, adjusting the composition of the molten steel, degassing (decarburization, denitrification, dehydrogenation), deoxidation, desulfurization, deph
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The existing furnace covers of steel-making electric furnaces mostly adopt the structure of masonry refractory bricks. The disadvantages of the furnace covers of this structure are many brick cracks, poor overall performance, high energy consumption, short service life, and long maintenance.
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