The quality of clay refractory bricks is related to a series of processes such as raw materials, process ratio, selection, shaping, drying and sintering. Improper operation of any link will affect the quality of the product.
1. Start with the purchase of raw materials
First of all, starting from the purchase of raw materials, we must control the quality and consider the aluminum content, impurities, and density issues. Because clay with a high aluminum content has high refractoriness, impurities will reduce the refractoriness and will also cause clay bricks to have surface of caves. Clays that are difficult to sinter have low strength and high porosity.
2. Pay attention to the process ratio during the production process
During the production process, attention should be paid to the process ratio. The composition of the particles has a great relationship with the strength and density of clay bricks. High-quality clay refractory bricks can be made with a reasonable mix of large, medium and small particles. During the mixing process, the raw materials must be granulated first and then powdered. Stir for about 3 minutes before adding water. After adding water, the stirring time should not be less than 10 minutes. Otherwise, the density of clay bricks after production will be low and cracks will appear.
3. Pay attention to the placement of the mold during the molding process
In addition, during the molding process, pay attention to the placement of the mold to prevent burrs, mold aging or hammer theft during molding. It must be molded by high pressure. The clay formed by high pressure has high density and strength. However, the molding hammer must pay attention to the exhaust, otherwise cracks will occur. After the second hammering, a heavy hammer can be used. Pay attention to the condition of the mold, and do not allow the mold to age and cause flash, which will affect the appearance of the clay bricks.
Firing is the last tiring process of clay refractory bricks. The quantity of bricks must be flat, upright, and straight. When loading the kiln cart, reasonable gaps and fire channels should be left. An appropriate distance should be maintained between the brick stack and the kiln wall and roof. Reduce the resistance of fireworks in the kiln. The kiln car must be packed densely at the top and sparsely at the bottom to allow for full and even firing. The fire to sinter the clay bricks must oxidize the atmosphere, so that the clay bricks will have the same color and not expand or shrink in size.
If the above points are implemented during the production process, the quality of clay bricks will definitely be improved.
