Chrome–magnesite bricks are NOT used for lining which of the following furnace sections, considering typical industry practice?

Introduction / Context:Chrome–magnesite bricks are basic refractories used where basic slags and high temperatures prevail. Some furnace sections, however, traditionally rely on different refractory families such as silica or fireclay.

Given Data / Assumptions:

• Coke oven regenerators typically use silica/fireclay-based checkers and walls.
• Basic steel and reheating services commonly apply MgO–Cr2O3 bricks.

Concept / Approach:Matching refractory chemistry to gas and slag environment is key. Coke ovens favor silica for high-temperature creep resistance and thermal expansion behavior suited to their cycles. Basic furnaces and kiln burning zones often use chrome–magnesite due to compatibility with basic slags and good hot strength.

Step-by-Step Solution:List typical applications for MgO–Cr2O3 (basic), excluding acid environments.Identify coke oven regenerators as silica-dominated installations.Select “Coke oven regenerator.”

Verification / Alternative check:Industry lining schematics show silica checkerwork in coke ovens versus basic refractories in steel furnace zones.

Why Other Options Are Wrong:Soaking pits/reheating/kiln burning zones can and do use basic bricks, including chrome–magnesite.

Common Pitfalls:Assuming one brick family fits all high-temperature applications; chemistry matters.

Final Answer:Coke oven regenerator