Chrome-magnesite bricks: where are these basic refractories commonly applied in high-temperature industry?

Introduction / Context:
Chrome-magnesite bricks combine magnesia's basicity with chromite's corrosion resistance, making them suitable for severe slags and thermal loads. Understanding their application range helps engineers match lining to service environment.

Given Data / Assumptions:

• Industries considered: steel (soaking pits, arc furnaces), non-ferrous (copper smelting), and glass (burner blocks/ports).
• Service conditions: high temperature, chemical attack, thermal cycling.

Concept / Approach:
Chrome-magnesite refractories tolerate basic slags and metal/slag turbulence, resist spalling, and handle localized flame impingement. This makes them candidates for soaking pit and EAF side walls, copper converters/melting units, and burner block regions of glass tanks where flame/alkali vapor attack occurs (composition tailored to application).

Step-by-Step Solution:
Match properties (basicity, corrosion, spall-resistance) to each listed unit.Recognize broad usage across steel and non-ferrous sectors; specialty glass areas also employ chrome-bearing refractories.Conclude that all listed applications are valid.

Verification / Alternative check:
Plant practice documents and refractory supplier catalogs list chrome-magnesia products for BOF/EAF sidewalls, soaking pits, copper converters, and selected glass furnace blocks.

Why Other Options Are Wrong:
Each individual option is correct but incomplete; the comprehensive answer is “All (a), (b) and (c).”

Common Pitfalls:
Assuming glass furnaces use only silica/zircon everywhere; in burner zones, chrome-bearing bricks may be selected for flame resistance.

Final Answer:
All (a), (b) and (c).