Refractory processing — Typical firing temperature range for magnesite (MgO) bricks is approximately which of the following (°C)?

Introduction:
Magnesite (MgO) bricks are basic refractories used in steelmaking and other high-temperature basic environments. Their manufacturing involves high-temperature firing to achieve desired densification, strength, and slag resistance. The question focuses on the representative firing temperature range.

Given Data / Assumptions:

• Product: fired magnesite refractory (not chemically bonded cold-set types).
• Objective: sufficient sintering and densification for service in steel and cement kilns.
• Temperatures listed are broad ranges.

Concept / Approach:
Sintering of magnesia grains requires high temperatures because MgO has a very high melting point (~2800°C) and relatively sluggish diffusion at lower temperatures. Industrial firing for standard dense magnesia bricks commonly occurs around 1600–1800°C to achieve proper microstructure and bond.

Step-by-Step Solution:
Consider MgO properties: high melting point implies high sintering temperature.Industrial practice: kilns for MgO bricks operate ~1600–1800°C for adequate densification.Exclude too-low ranges (≤1200°C): insufficient sintering.Exclude 2400–2600°C: technically unnecessary and uneconomical for standard products.

Verification / Alternative check:
Textbook firing schedules and vendor datasheets typically cite 1600–1800°C for ordinary fired magnesite bricks; special ultra-dense grades may use higher but still below 2400°C.

Why Other Options Are Wrong:

• 800–1000°C / 1000–1200°C: Too low for MgO sintering.
• 2400–2600°C: Excessive; not standard practice for typical fired bricks.

Common Pitfalls:
Confusing firing temperatures of clay/silica refractories with basic magnesia; assuming “higher is always better” without considering energy and microstructural goals.

Final Answer:
1600-1800