With the continuous development of amorphous refractory castables, refractory prefabricated products are becoming more and more diversified and proportional. But there are also certain advantages and disadvantages to using refractory prefabs.
The advantages of prefabricated parts are: because they are made into different shapes according to the size and specifications of special parts of the furnace type, and the construction is convenient and fast when used. In addition, the oven time is short, and because there are many manufacturers, it can be quickly heated up after a certain temperature of baking after the production molding is drained.
In addition, the prefabricated parts have good thermal insulation performance, because they are prefabricated and molded according to the shape of the part, there are no gaps, the heat insulation effect is good, and the air tightness is strong. The refractory preforms are made of different materials, but the baked preforms have good creep and strong wear resistance. 】
The refractory prefabricated parts are divided into small pieces in advance, and the appropriate shape is designed, and then the mold is made according to the shape, and then transported to the site for construction and installation after pouring molding, curing and baking in the factory. The application of refractory prefabricated parts has changed the method of on-site pouring construction of traditional castable, so that the construction is simple and easy, can save on-site mixing, pouring or ramming and the corresponding equipment required, greatly saves the construction time, and makes the on-site construction conditions not affected by the construction environment and the season, and is more conducive to ensuring the construction quality. In order to facilitate production, transportation and installation, the shape of the prefabricated parts should not be designed to be too large and too complex, and the size should be uniform as much as possible, in addition, the combination between the blocks should be taken into account, so as to enhance the integration effect after construction. The construction site needs to be cleaned, otherwise it will affect the installation accuracy and effect of the refractory prefab.
Most of the parts used in refractory prefabricated parts are in special parts in harsh environments such as high temperature, cement clinker erosion, wear, quenching and heating, etc., which are prone to mechanical deformation, and need to have good erosion resistance, good wear resistance, high temperature gas erosion resistance and excellent thermal shock stability. In order to meet the performance requirements, the ratio of raw materials is the basis, which is similar to the requirements of castables, but the castable needs to pay attention to the performance of the entire temperature range from construction to the use conditions, and the refractory prefabricated parts as a shaped product prepared by castable, can pay attention to the performance after baking. Many manufacturers have listed the performance indicators of prefabricated parts under different temperature conditions, which is actually of little reference significance for cement manufacturers. In view of this situation, the raw materials and proportions used in the refractory precast can be adjusted on the basis of the castable, and more attention needs to be paid to the performance after baking.
The refractory materials in the key parts of the cement kiln need high construction quality in the construction process, and during the maintenance of the cement kiln, the general construction period is short, the quality of on-site pouring construction is difficult to guarantee, and the quality of construction has a great impact on the service life of refractories. The increase of water addition will increase the porosity of the castable, reduce the strength, and seriously affect the wear resistance of the castable. After the construction of the castable is completed, there must be a certain curing time, and the baking treatment must be carried out after the curing is completed, otherwise it is easy to burst.
Due to the production process of refractory prefabricated parts in the production enterprise, it can overcome the adverse effects of factors such as tight on-site construction time, environmental seasonal temperature changes, on-site construction management, etc., and can ensure the construction quality after full maintenance and strict baking, greatly reduce the quality problems caused by non-standard construction, and give full play to the performance of refractory materials. After installation, it can be used directly for ignition, which shortens the maintenance time and can create good economic benefits.
