The construction of high aluminum refractory castable must be strictly required to ensure the good physical properties of the pouring materials. Before the construction of kiln, the quality of the material was very good, but it did not meet the requirements after the application, which was mainly related to the construction process, maintenance and baking.
Seeing that the falling area is large, if it is very small, use some pounds or plastic to repair it, but you must first clean up the contact surface.Below will be explained to you the specific method:
(1) Correctly select the material and welding material to avoid the anchoring parts fall off
Due to the different steel plates, anchors, and electrode materials of the kiln equipment, the heat expansion volume of each part of each part is not consistent when the use of heating, which generates huge thermal stress, which can easily lead to the cracking of the solder joints, resulting in the anchor and pouring. Therefore, when choosing anchor and a stake, you should pay attention to the same as the steel plate material of the kiln equipment to avoid cracking the solder joints due to different expansion volume. In addition, try to use a single anchor or increase the length of the welding joints as much as possible to increase the welding firmness. If the "y" -shaped anchor can be replaced with "L" shape, and even the "L" shaped into "X" welded, it can also increase the fixed ability of the anchor when the pouring material is thin to prevent falling off.
(2) Improve construction quality
Before the construction of the castable, the surrounding area and the surrounding environment must be kept clean in order to prevent the refrigeration and refractory materials of unclear material. The construction tools and equipment should also be kept clean. If the more common water -resistant refractory castable is used, the corresponding fluidity is poor, and the corresponding fluctuations will have a certain impact on the construction. On this basis, any increase in water volume will reduce the intensity of castable. Therefore, in order to facilitate construction, some operators increase the amount of water at will, resulting in a decline in the performance of pouring. In addition to adding water, the mixing time is added. The liquidity of the castable must be played after stirring for a certain time (about 3 minutes), so it must be operated according to the construction description of refractory castable. This requires the factory to accept the work procedures of each specific link in the masonry process before construction.
(3) Maintenance and baking system.
Maintenance and baking is also an important factor affecting the performance of high aluminum refractory castable. The maintenance is to give a coordinate and hardening time in the binding agent in the pouring material to obtain sufficient initial intensity. The key to control during maintenance is the humidity of the pouring (should be kept humid), the maintenance temperature (should be at 15-35 ° C) and time. After baking is hardening, it evaporates the remaining water, promoting the sintering process at high temperature to further improve the physical properties of the pouring body. During the baking process, the heating rate is mainly controlled, generally 15-35 ° C per hour. Once the temperature starts, it cannot be interrupted or stopped heating, until the heating is over. Otherwise, it should be very careful to cool down the furnace, and when the heating up again, it is necessary to follow the prescribed steps.
However, in the actual production process, the cause of the anti -refractory castable of the high aluminum and the solutions taken may not only be mentioned above, so specifically analyze and handle it flexibly according to the specific situation to ensure that it achieves good results.
