What is the difference between castables and ramming materials?
What is the difference between castables and ramming materials? Both products belong to amorphous refractory materials. Ramming materials are constructed by ramming and hardened by heating. Castable materials are constructed by pouring and can be hardened without heating. So what is the difference between ramming materials and castables? The difference lies in the construction method and hardening method. Please see the details below.
Definition of ramming and pouring
1. Ramming materials, ramming materials are mixed on site, rammed with pneumatic picks or machinery, and the wind pressure is not less than 0.5MPa. For parts with less material or unimportant use, manual knotting can also be used.
Because it is made by mixing the refractory aggregate, powder, binder, admixture, water or other liquids with a fixed amount. Therefore, the lining of the refractory ramming material has a low moisture content, dense knots, and better performance than refractory castables of the same material. The disadvantages of refractory ramming materials are slow construction speed and high labor intensity. There is a trend of being replaced by dry vibration materials and high-quality refractory castables.
2. Castables. Castables are generally cast and formed by pouring, vibration or tamping at the site of use, and can also be made into prefabricated parts for use.
Application and classification
What is the difference between ramming materials and castables? Castables have high fluidity and a wide range of applications. Ramming materials are less in quantity or are used in unimportant parts, and can also be knotted by hand. Ramming materials are classified by material: high alumina, clay, magnesia, dolomite, zirconium and silicon carbide-carbon refractory ramming materials.
Castables are classified by material:
1. According to the porosity distribution, there are two types of dense refractory castables and thermal insulation refractory materials with a porosity of not less than 45%;
2. According to the binder, there are hydraulic bonding, chemical bonding, and condensation bonding refractory castables.
Castables are a kind of amorphous refractory material that is currently widely produced and used. It is mainly used to construct various heating furnace linings and other integral structures. It is widely used in metallurgy, petroleum, chemical industry, building materials, electric power, mechanical industrial kilns and heating equipment. High-quality products can also be used in smelting furnaces.
Ramming material is made of silicon carbide, graphite, electric calcined anthracite as raw materials, mixed with a variety of ultrafine powder additives, and fused cement or composite resin as a binder. It is used to fill the gap between the furnace cooling equipment and the masonry or as a filler for the masonry leveling layer. Ramming material has good chemical stability, erosion resistance, wear resistance, peeling resistance, and thermal shock resistance. It is widely used in metallurgy, building materials, non-ferrous metal smelting, chemical industry, machinery and other manufacturing industries.
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