What are the useful explosion-proof agents in unshaped refractories

Substances that can improve the air permeability of the lining body constructed of amorphous refractory materials and prevent the lining body from bursting due to excessive internal vapor pressure during the baking process are called anti-explosion agents, also known as quick-drying The use of amorphous refractories, especially the linings constructed with castable refractories, often produces isolated closed spherical pores of different sizes that are not connected, and the air permeability is very poor, especially for fine castables. This kind of castable lining, if the baking speed is too fast, the steam pressure inside the lining will exceed the bonding strength (mainly tensile strength) of the material and burst. Therefore, in many occasions, it is necessary to add explosion-proof agent (or called quick-drying agent).

Anti-explosion agents for amorphous refractory materials include active metal powders, organic compounds and combustible organic fibers. Active metal powders are generally made of metal aluminum powder. Capillary vents will be formed when H2 gas escapes from the inside of the castable before the castable is condensed. , so as to improve its air permeability. However, when using aluminum powder as an anti-explosion agent, it is necessary to select active aluminum powder and appropriate fineness and addition amount. Improper use will cause cracks in the sintered lining body, swelling and damage to the lining body structure, sometimes Due to the excessive concentration or excessive amount of escaping hydrogen, there is also the danger of burning and blasting in case of fire.

Organic compounds that can be used as explosion-proof agents are: aluminum lactate. Their explosion-proof effect acts on the micro-pores (or micro-cracks) that can be connected in the castable matrix, so that the steam generated during baking can be easily discharged and reduce the internal steam pressure of the lining. without damaging the lining.

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