ISSN 2594-5327
76º Congresso Anual da ABM - Internacional — vol. 76, num.76 (2023)
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Most magnesia-chrome bricks, which are typically applied as relining material in various industrial furnaces, are fired bricks, roughly 90% of which are produced through a high temperature firing step in the case of our production plant. On the other hand, the fuel consumption of unfired magnesia-chrome bricks in the production process is approximately 1/9 that of fired bricks. Substitution of fired magnesia-chrome bricks with unfired products, therefore, directly contributes to reducing environmental impact. Historically, unfired magnesia-chrome bricks were commonly used as a metallic case combined with bricks that could be suspended from the ceiling of open hearth furnaces. Even today, they are produced in small quantities for limited applications such as copper smelting furnaces with a similar furnace structure. Taking into account the above-mentioned advantageous energy-saving aspect, new unfired magnesia-chrome bricks were developed by introducing several modern technologies for expanding its applications. With use in the lower vessel of RH vacuum degassers, as one of the potential applications, a series of laboratory evaluation tests were conducted. The newly developed unfired magnesia-chrome bricks exhibited an equivalent level of thermal spalling resistance as well as FeO corrosion resistance to that of currently used direct-bonded magnesia-chrome bricks.
Most magnesia-chrome bricks, which are typically applied as relining material in various industrial furnaces, are fired bricks, roughly 90% of which are produced through a high temperature firing step in the case of our production plant. On the other hand, the fuel consumption of unfired magnesia-chrome bricks in the production process is approximately 1/9 that of fired bricks. Substitution of fired magnesia-chrome bricks with unfired products, therefore, directly contributes to reducing environmental impact. Historically, unfired magnesia-chrome bricks were commonly used as a metallic case combined with bricks that could be suspended from the ceiling of open hearth furnaces. Even today, they are produced in small quantities for limited applications such as copper smelting furnaces with a similar furnace structure. Taking into account the above-mentioned advantageous energy-saving aspect, new unfired magnesia-chrome bricks were developed by introducing several modern technologies for expanding its applications. With use in the lower vessel of RH vacuum degassers, as one of the potential applications, a series of laboratory evaluation tests were conducted. The newly developed unfired magnesia-chrome bricks exhibited an equivalent level of thermal spalling resistance as well as FeO corrosion resistance to that of currently used direct-bonded magnesia-chrome bricks.
Palavras-chave
Refractory; Magnesia-chrome; unfired bricks; RH degasser
Refractory; Magnesia-chrome; unfired bricks; RH degasser
Como citar
Ishihara, Eiji.
DEVELOPMENT OF UNFIRED MAGNESIA-CHROME REFRACTORY BRICK
,
p. 803-815.
In: 76º Congresso Anual da ABM - Internacional,
São Paulo,
2023.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-39491
