Refractory castables and measures to increase their service life --1

With the development of new dry-process cement production technology, corresponding refractory materials have also made considerable progress. In addition to breakthroughs in conventional refractory bricks, the performance of refractory castables has become more and more perfect, and is widely used in unshaped parts in kilns. As we all know, refractory castable is a kind of amorphous refractory without calcining. It is made up of refractory aggregate, refractory powder and cement in a certain proportion; it has good fluidity after adding water and stirring during construction. Then it is formed and cured (to be baked according to a certain temperature system) to make it condense and harden. 

The use characteristics of refractory castables are as follows: First, the masonry structure has fewer joints, strong integrity, and good sealing performance. It can avoid the infiltration of clinker powder during application and operation; Second, it is easy to anchor and easy to construct, which is beneficial to improve masonry. Efficiency and masonry quality; The third is that raw materials are widely used, which is convenient for comprehensive utilization of resources, and the delivery time is short, which can reduce inventory and related costs accordingly. Based on these advantages, the application ratio of refractory castables in the cement firing system has been increasing year by year. Taking the 5000t/d new dry process kiln as an example, the use ratio of refractory castables and refractory bricks has reached 1:1.

With the gradual expansion of the application of refractory castables, its life cycle has become the most concerned issue of all owners. In order to ensure the life cycle that meets the design requirements, the following aspects should be achieved: First, a strong manufacturer should be selected to ensure the quality of the refractory castable itself; Second, a reasonable selection and configuration should be carried out according to the use environment; It is necessary to have a reasonable construction plan and strict construction process control measures during construction, including proportioning control, molding quality control and reasonable maintenance, heating system control and so on.