Refractory bricks are divided into ordinary clay refractory bricks, dense clay refractory bricks, high-density clay refractory bricks, silica bricks, magnesia bricks, and aluminum-magnesia-carbon bricks. The bulk density is different, some are soft and some are hard.
According to the different types of raw materials used in the production of refractory bricks, the bulk density of refractory bricks is also different. Generally, the bulk density of refractory materials is measured before leaving the factory. Bulk density: indicates the ratio of the mass of the dried product to the total volume, expressed in g/cm3 , The volume density index is the main index to characterize the compactness of the product. When the density is higher, it can reduce the intrusion of external slag.
Method for increasing the bulk density of refractory bricks and improving the strength of refractory bricks
1. Properly increase the temperature of sintered refractory bricks
Tests have proved that the same raw materials and bricks produced by the same brick machine have different firing temperatures and different strengths of sintered refractory bricks. The test results show that the compressive strength of bricks increases with the increase of the firing temperature of the tunnel kiln.
2. Properly extend the holding time.
Tests have proved that the same raw material, the same brick machine, the same heating and cooling speed, the sintering temperature is 900 Celsius, and the holding time is different, the compressive strength of the sintered brick will be different. The appropriate holding time will improve the sintered brick. Compressive strength and quality are beneficial.
3. It is recommended to use low-temperature long burning.
Nowadays, sintered refractory bricks are generally mixed with internal combustion, and "high temperature and short burning" are often used to increase the output as the goal. Long-term practice has proved that the use of "high temperature and short burning" firing method for internal combustion bricks has a certain impact on improving the quality of refractory bricks. Products often have black-hearted refractory bricks, black scars, cracks, embossing, etc., and the compressive strength is also somewhat Decrease, and more serious, increase coal consumption, waste energy, and there is no protection of the ecological environment.