Refractory ramming material characteristics

The refractory ramming material can be applied at normal temperature. For example, a thermoplastic organic material capable of forming a carbon bond is used as a bonding agent, and most of them are applied immediately after the hot state is uniformly stirred. After the molding, different heating methods are used to promote the hardening according to the hardening characteristics of the mixture. Or sintered.

The ramming material containing the inorganic chemical bonding agent can be demoulded and baked after self-hardening to a certain strength; the material containing the thermoplastic carbon binder is demolded after being cooled to have appropriate strength, after demolding It should be heated quickly to carbonize it before use. The sintering of the refractory ramming lining can be carried out before use or by heat treatment using a suitable thermal system in one use.

The baking temperature increase system for ramming materials varies according to the material. The main purpose of ramming is to cast smelting furnace lining in direct contact with molten material, such as blast furnace tapping hook, steelmaking furnace bottom, induction furnace lining, electric furnace roof and rotary kiln blanking part, etc. Outside the furnace lining, it is also possible to manufacture large-scale prefabricated components through years of practical experience, the furnace temperature is lower than that of Pugang, and the furnace life is higher.

Use this product to reduce the strength of workers, reduce costs and improve economic efficiency.

To properly select the medium frequency furnace alkaline, alkaline, and alkaline lining materials you use to protect the intermediate frequency furnace.

Acid lining material. That is, the quartz sand furnace charge requires SiO2 content of 98 to 99% or more, requiring a long geological age, good crystallization, and complete crystal lattice. This material has a large working temperature of around 1650 ° C and has good resistance to acid slag. While cast iron is an acidic environment, quartz sand materials are often used in cast iron electric furnaces. At present, due to low cost, many times of firing are also widely used in low alloy steel and cast steel.

Neutral material. Magnesium-aluminum spinel material is actually slightly alkaline in nature. It is derived from high-purity corundum and high-quality sintered magnesia. It has good resistance to chemical attack and thermal shock resistance. . This material has a large operating temperature of around 1800 °C. This material is suitable for cast steel furnaces. And a variety of alloy steel, manganese steel, high chromium casting. Generally used for alloy materials. At present, there is also a material that specializes in smelting stainless steel, which is also neutral, and the main component is corundum.

Alkaline material. Magnesia has sintered magnesia and fused magnesia. The content of MgO in sintered magnesia is more than 84%, the working temperature is 1700°C; the content of MgO in fused magnesia is more than 92%, and the working temperature is 1800°C. The thermal conductivity of magnesia is good. The thermal expansion is large, and the discontinuous use is prone to cracks, so it can only be used as a small cast steel.