Drainage agent is an industrial product aimed at the problems of low ladle self-opening rate, excessive oxygen burning, and even interruption of the continuous casting process in the continuous casting process of the steel industry. It is composed of high-quality imported chrome ore, refined quartz sand and high-refractory materials. It has the advantages of good fluidity, high specific gravity, fast flow rate, appropriate sintering layer thickness, and resistance to molten steel corrosion and penetration. Light burnt magnesia powder