Ladrillo de boquilla resistente al fuego

El ladrillo de la boquilla está hecho de materias primas de alta pureza., formado por fundición vibratoria y horneado a baja temperatura, y tiene las ventajas de una alta resistencia térmica, resistencia al choque térmico, resistencia a la corrosión y resistencia a la erosión, y reparacion termica.

Introduction to nozzle brick

The seat brick is a refractory brick built at the bottom of the steel drum to fix the nozzle brick. Its shape is square, so it is also called a square brick. The seat brick is used to fix the position of the water outlet; it is convenient for dismantling and installing the water outlet; it supports the lower end of the stopper rod when pouring; after pouring, ensure that the stopper rod slides along the arc surface to the water outlet, and then cuts off the injection flow. Seat brick materials can be divided into clay, high alumina, or unfired high alumina.

Specification of fire-resistant nozzle brick

Artículo	Índice
Artículo	Chromium Fused Alumina	Fused Alumina	Corundum Spinel
Alabama₂oh₃ %	≥90	≥92	≥80
Alabama₂oh₃+MgO %	/	/	≥92
Cr₂oh₃ %	≥2	/	/
Densidad aparente g/cm³	≥3.0	≥2,95	≥2,95
Resistencia al aplastamiento en frío MPa	≥60	≥50	≥50
0.2MPa Refractoriness under load ℃	≥1700	≥1700	≥1700

Characteristics of nozzle brick

High-temperature corrosion resistance
Refining ladles have very strict requirements in terms of temperature and time, and the maximum temperature often reaches above 1750 ℃. During the refining operation, the alkalinity of the slag has a great influence on the life of the refractory material. The alkalinity of ladle refining slag varies within the range of approximately 0.6 a 0.4, so refractory materials are corroded by acidic slag, and alkaline slag with strong permeability at high temperatures is damaged quickly.
High-temperature wear resistance
Various ladle refining methods use forced stirring, which causes serious wear and tear on the nozzle brick at high temperatures.
Peeling resistance
Due to the intermittent operation, the temperature will change greatly, which is prone to thermal spalling and structural spalling, and the use conditions are very harsh. There is a big gap between the performance of the currently used steel-clad breathable bricks and the performance they should have. Por ejemplo, in terms of high-temperature corrosion resistance and spalling resistance, especially the spalling resistance needs to be improved.