Special-shaped firebricks are irregularly shaped fire bricks, although they can be made into firebricks of different materials. But because of its weight or shape is not easy to shape or burn, so difficult to make.
Under normal circumstances, shaped firebricks are used in the nozzle, the furnace door, the pipeline or some irregular parts of the steel, but the number of shaped fireb ricks is not large, and it is not good to make. Because of its small quantity, many manufacturers are made by hand or hydraulic form.
Shaped firebricks are made in different ways
If the refractory brick is made of clay and high aluminum bricks, the weight is more than 100kg, and the ratio of prefabrication is more because the casting molding process is simple. Small weight clay brick and high aluminum refractory brick, must control the water emission, the firing process can be burned together with the standard type of brick. If free water and crystalline water are not completely discharged, it is easy to burst when burned.
If the single weight of the shaped refractory brick is small, it is useful to make wood mold, and it is also useful to extrude steel mold, the cost of steel mold is high, and the molding is not good, and the production process will be higher than that of the commonly used standard model brick, because the middle drying process is long. If the brick is too heavy, the yield will be lower.
If the casting method is used, there is no bad molding or low firing yield, but the prefabricated brick drainage process cycle is long, and the production time needs to be controlled. Under normal circumstances, it is necessary to communicate with the user manufacturer to use the time, which can not be delayed.
If the shaped refractory brick is made into magnesium brick, it is necessary to consider the control of the drainage process, because magnesium refractory fire brick is afraid of water, if the drainage process is not scientific, it is easy to crack or explode into the finished product. If you must make magnesia brick, try to use the method of mechanical molding. By hand molding, magnesium shaped refractory brick yield.
If you want to make silicon shaped firebrick, the scale of the mold, you need to do a good scale ratio to make the mold, otherwise there will be a large size of the finished product can not be used.
The reason why the shaped fire brick is not good to make is that the situation is different and the number is small. Depending on the situation, if it is a small weight can be directly pressed by the machine, if the weight is too large shaped firebrick can be prefabricated. If you must use the press friction molding, you must do a good job of the mold in advance.
