Refractory bricks are required to have high compressive strength, which is also an important performance basis for the selection and application of refractory bricks. So what ways can be used to improve the pressure resistance of refractory bricks? Below, the technicians of Henan Lite refractory bricks give the following Approach
1. Increase the pressure of brick molding machine
The increase in the forming pressure of the brick machine increases the density of the refractory bricks. Only by increasing the density of the green bricks can high-strength sintered bricks be fired. For refractory bricks with a molding pressure of 2.2~2.3MPa, the compressive strength of the fired brick is generally 13.9-15MPa, and for the bricks with a molding pressure of 3MPa, the compressive strength of the fired brick can easily reach 20MPa.
2. Appropriately 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 compressive strength of bricks increases as the firing temperature of the tunnel kiln increases.
3. 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 ℃, and the holding time is different, the compressive strength of the sintered brick will be different. The appropriate holding time is helpful for improving the sintered brick. Compressive strength and quality are beneficial.
4. It is recommended to use low temperature long burn
Nowadays, sintered refractory bricks are generally mixed with internal combustion, and "high-temperature short-burning" is 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 corresponding impact on improving the quality of refractory bricks. The products often have black hearts, black scars, cracks, embossing, etc., and the compressive strength is also reduced. What is more serious is that it increases coal consumption, wastes energy, and is not conducive to protecting the ecological environment. Therefore, it is recommended to use "low temperature long burn". Using low-temperature long-term burning, under the condition of about 80% internal combustion, the interval from 650 to 900 ℃ should be no less than 6 hours, and the interval from 900 ℃ to the end of the sintering of the product should not be less than 6 hours. At 12h, the internal combustion in the center of the green body can be completely burned, and it can give full play to its full thermal energy.
