Ramming mass:What it is & Where it’s Used

　　Ramming mass, also known as refractory ramming mix or furnace lining material, is a specialized type of refractory material used for lining the walls and bottoms of various types of furnaces. It is typically a dry, granular substance composed of refractory aggregates, binders, and additives.

　　Ramming mass is specifically designed to withstand high temperatures, thermal cycling, mechanical stresses, and chemical reactions encountered in furnace applications. It creates a dense and compact lining that provides insulation, erosion resistance, and protection against molten metals, slag, and corrosive gases.

　　The name "ramming mass" comes from the process of installing it within the furnace. The material is compacted and rammed into place using specialized tools, ensuring proper density and adherence to the furnace walls or floors. This compaction helps create a strong and durable lining that can withstand the harsh conditions within the furnace.

　　Ramming mass compositions can vary depending on the specific application requirements. Common types include silica-based ramming mass, alumina-based ramming mass, magnesia-based ramming mass, and combinations thereof. Different compositions offer varying levels of temperature resistance, erosion resistance, and chemical compatibility.

　　Ramming mass, also known as refractory ramming mix, is commonly used in various applications where a durable and high-temperature resistant lining is required. Some key applications of ramming mass include:

　　1. Induction furnaces: Ramming mass is extensively used for lining the walls of induction furnaces. It provides a protective barrier against high temperatures, thermal cycling, and corrosive molten metals. Ramming mass helps maintain the integrity of the furnace lining and ensures efficient heat transfer during the melting process.

　　2. Electric arc furnaces (EAF): EAFs, widely used in steelmaking, require a robust lining material to withstand the intense heat generated by the electric arcs. Ramming mass is employed to line the walls and roof of EAFs, offering excellent resistance against high temperatures, chemical reactions, and mechanical stresses.

　　3. Ladle linings: Ramming mass is used to line ladles, which are vessels used to transport and pour molten metal. The lining protects the ladle from the corrosive effects of the metal and ensures proper thermal insulation to prevent premature cooling or solidification.

　　4. Tundish linings: Tundishes are intermediate vessels used in continuous casting processes to control the flow and distribution of molten metal. Ramming mass can be applied to the tundish lining to provide thermal insulation, erosion resistance, and ensure smooth casting operations.

　　5. Coreless induction furnaces: Ramming mass is utilized to line coreless induction furnaces, which are used for melting and holding various metals. The rammed lining helps protect the furnace structure, minimizes heat loss, and facilitates efficient metal melting and pouring.

　　6. Foundry applications: Ramming mass finds application in various foundry processes, including sand casting and investment casting. It is used to line molds and crucibles, providing thermal insulation, erosion resistance, and facilitating the controlled solidification of molten metal.

　　7. Other high-temperature applications: Ramming mass can be employed in other high-temperature applications, such as cement kilns, incinerators, and boilers. It helps create a durable and thermally efficient lining that withstands extreme temperatures, chemical exposure, and mechanical stresses.

　　1. High temperature resistance: Ramming mass is designed to withstand extreme temperatures typically encountered in furnace linings, ranging from 1300°C (2372°F) up to 1800°C (3272°F) and higher. It maintains its structural integrity and exhibits minimal softening or deformation at these high temperatures.

　　2. Good thermal shock resistance: Ramming mass has excellent thermal shock resistance, allowing it to withstand rapid temperature changes without cracking or spalling. This property is crucial in applications where alternating heating and cooling cycles occur frequently.

　　3. Low porosity: Ramming mass is typically formulated with low porosity, which helps minimize heat transfer through the lining. This low porosity results in better insulation properties and improved energy efficiency by reducing heat loss.

　　4. Excellent erosion resistance: Ramming mass provides good resistance against erosion caused by molten metals, slag, and corrosive gases. It can withstand the chemical attack and mechanical forces exerted by these substances, thus extending the service life of the refractory lining.

　　5. Easy installation: Ramming mass is easy to install and shape according to the specific requirements of the furnace. It can be compacted and rammed into place using specialized tools, ensuring proper lining density and adherence to the furnace wall.

　　6. Customizable compositions: Ramming mass comes in different compositions to suit various applications. Common types include silica-based ramming mass, alumina-based ramming mass, magnesia-based ramming mass, and combinations thereof. Different compositions offer varying levels of temperature resistance, erosion resistance, and chemical compatibility.

　　7. Mechanical strength: Ramming mass possesses adequate mechanical strength to withstand the forces exerted by the weight of the material and any mechanical stresses encountered during operation. However, it is typically less strong compared to materials like bricks or castables.

　　8. Desirable flow characteristics: Ramming mass should have appropriate flow characteristics to ensure easy application and compaction. It should be able to maintain its shape after being rammed, providing a cohesive lining with good integrity.