Overview
Sintered magnesia, also known as dead-burned magnesia, is a high-temperature processed form of magnesium oxide (MgO). It is produced by sintering magnesite (MgCO3) or magnesium hydroxide (Mg(OH)2) at temperatures above 1,500°C, resulting in a dense, stable material with superior refractory properties. Due to its high melting point and resistance to thermal shock, sintered magnesia is a critical material in industries requiring extreme heat resistance. Its production process ensures low reactivity and high durability, making it indispensable for refractory linings in furnaces and kilns.
Physical and Chemical Properties
Sintered magnesia exhibits exceptional thermal stability, with a melting point of 2,852°C and a boiling point of 3,600°C. Its density is approximately 3.58 g/cm³, and it is chemically inert under normal conditions, though it reacts with strong acids. The material is insoluble in water but may absorb moisture over time if not stored properly. Its granular or powdered form allows for versatile application methods, including pressing, casting, or spraying in refractory products.
Main Applications
The primary use of sintered magnesia is in refractory materials, such as bricks and monolithic linings for steelmaking furnaces, cement kilns, and glass tanks. Its ability to withstand extreme temperatures and corrosive environments makes it ideal for these applications. Additionally, sintered magnesia is used in ceramics, electrical insulation, and as a raw material for magnesium-based chemicals. In metallurgy, it serves as a slag conditioner and a component in crucibles and ladles.
Safety and Storage
While sintered magnesia is generally safe, prolonged exposure to dust can cause respiratory irritation. Workers should use protective masks, gloves, and goggles when handling the material. Storage conditions are critical to maintaining quality. Sintered magnesia must be kept in a dry, well-ventilated area to prevent moisture absorption. Containers should be sealed tightly to avoid contamination from acids or other reactive substances.
B2B Procurement Guide
When procuring sintered magnesia, buyers should prioritize purity (typically 90-99% MgO), particle size distribution, and sintering degree. These factors directly impact performance in refractory applications. Suppliers should provide detailed technical specifications, including chemical analysis and thermal stability data. Bulk purchasing may offer cost advantages, but ensure proper logistics to prevent moisture exposure during transit.
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