- Time:Feb 06, 2023
Anti-explosion agents can improve the anti-burst performance of refractory castables. At present, several anti-explosion agents are commonly used, such as metal aluminum powder, azodicarbonamide, aluminum lactate, organic fiber, etc., by increasing the open pores or fine cracks inside the dense castable To improve air permeability, make the water vapor in the castable easy to discharge, and improve the anti-burst performance.
Aluminum powder: During the reaction between metal aluminum powder and water, a large amount of gas is generated and discharged through a certain channel, forming a large number of open vent holes, which improves the air permeability of the castable, thus providing a channel for the dry drainage of the castable. The main raw material of metal aluminum powder is metal aluminum ingots, and the current market price of 200-mesh metal aluminum powder is 22,000-24,000 yuan/ton.
Burst-proof fiber: The anti-explosion mechanism is that during the baking process of the castable, the organic fibers evenly mixed in the castable will shrink, melt or carbonize when heated, forming fine and narrow pores, so that the water vapor generated by the heat in the castable can quickly diffuse and volatilize Go out to avoid the accumulation of large pressure in the pouring body and cause bursting. The mainstream quotations of explosion-proof fibers with a melting point of 105°C are concentrated at 24,000-27,000 yuan/ton; the quotations of explosion-proof fibers with a melting point of 150-160°C are concentrated at 16,000-17,000 yuan/ton.
Azodicarbonamide：ADC foaming agent, the gas generating principle of organic gas generating agent is that the gas generating agent decomposes with cement and water to generate a certain calcium salt, which decomposes to generate gas. Since the organic gas generating agent does not react as violently as metal aluminum powder, the castable is not prone to the problems of bulging and fine powder floating. The current market price is about 16,000 yuan/ton.
Basic Aluminum Lactate: It is added to the castable combined with pure calcium aluminate cement in solution state, and the matrix is gelled during the curing process to produce network micro-cracks and improve the burst resistance. However, it is easy to form intermediate cracks after drying, which affects the corrosion resistance and use effect. At present, the market price of aluminum lactate is about 32,000 yuan/ton.
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