Performance characteristics of silica checker refractory brick for hot blast stove

Silica checker refractory brick for hot blast stove is a siliceous refractory product that is mainly used for building high-temperature parts of blast furnace hot blast stoves with tridymite as the main crystal phase. Silica checker refractory bricks for hot blast stoves should have the following characteristics:

(1) Under the condition of long-term high temperature and load, the volume is stable and the high-temperature creep rate is low.

(2) Good chemical resistance.

(3) The thermal conductivity is large.

Silicon refractory is an acid refractory material, which has good resistance to oxides such as CaO, FeO, and Fe2O3, and has the advantages of high softening temperature under load, stable volume at high temperature, and high thermal conductivity, but low temperature (below 800 ℃) thermal stability Poor, the specific realization is: the softening temperature under load can be as high as (1640-1680 °C), close to the melting point of tridymite (1670 °C), and the thermal stability above 800 °C is very good, which can adapt to large changes in temperature; Silica bricks use tridymite as the main crystal phase, which has a stable volume and low creep rate under high-temperature load. However, at 200-300°C and 573°C, due to the crystal form transformation, the volume expands suddenly, which is easy cause structural damage. Therefore, severe temperature changes should be avoided below 600°C.