Title

Combining Silicon Carbide & Graphitic Refractories to Maximize Blast Furnace Bosh & Stack Lining Performance

Combining Silicon Carbide & Graphitic Refractories to Maximize Blast Furnace Bosh & Stack Lining Performance

Authorship

COLOMBINI, RUBENS; DZERMEJKO, ALBERT J.

COLOMBINI, RUBENS

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DZERMEJKO, ALBERT J.

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DOI

10.5151/2594-5300-26Aciaria-107-126

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Abstract

Blast furnace bosh and stack lining wear is caused by a combination of thermal shock, chemical attack and abrasion. The severity of attack by each individual mechanism varies in intensity, by furnace zone, depending on furnace operating parameters and burden materials. Refractory lining materials can be chosen which will combat individual wear mechanisms. However, there is no perfect refractory which possesses the required resistance to all of the wear mechanisms encountered. Instead, combinations of refractories, specifically silicon carbide, hot pressed semigraphite and graphite, can be utilized to take advantage of the principal characteristics of each material. The composite refractory systems thus formed will provide the optimum performance of the lining, by combining the best wear resistant properties of each grade utilized, to provide the longest possible life. This paper addresses the design theory, concepts, and methods that can be utilized by the blast furnace refractory designer to significantly improve bosh and stack lining performance.

Blast furnace bosh and stack lining wear is caused by a combination of thermal shock, chemical attack and abrasion. The severity of attack by each individual mechanism varies in intensity, by furnace zone, depending on furnace operating parameters and burden materials. Refractory lining materials can be chosen which will combat individual wear mechanisms. However, there is no perfect refractory which possesses the required resistance to all of the wear mechanisms encountered. Instead, combinations of refractories, specifically silicon carbide, hot pressed semigraphite and graphite, can be utilized to take advantage of the principal characteristics of each material. The composite refractory systems thus formed will provide the optimum performance of the lining, by combining the best wear resistant properties of each grade utilized, to provide the longest possible life. This paper addresses the design theory, concepts, and methods that can be utilized by the blast furnace refractory designer to significantly improve bosh and stack lining performance.