The Main Technical Points For The Construction Of Refractory Castables

The formulation of refractory castables includes two parts: application design parameters and material design parameters.
The refractory castable used under the set target conditions needs to consider factors such as raw material combination, manufacturing technology, material assembly (construction), and application technology.
The goal of formula design is to find a balance between material properties and application conditions.
Usually, the type and quality of refractory materials for the lining of a kiln are determined based on the actual operating conditions of the kiln (operating temperature, furnace atmosphere, and contact state of dust, steam, liquid, and/or slag) and the characteristics of the slag. If refractory castables are selected as the target lining, materials suitable for the usage conditions, appropriate bonding systems, and additives that can further improve and enhance performance should be used to produce refractory castables with better performance.
The main technical points for the construction of refractory castables include:
(1) During construction, the mix proportion of refractory castables should not be arbitrarily changed, and water or other materials should not be added to the mixed refractory castables at will;
(2) The formwork used for pouring should have sufficient strength and rigidity, accurate formwork dimensions, and prevent deformation during construction;
(3) The joints of the template should be tight and not leak grout, and anti sticking measures should be taken for the template;
(4) Waterproof measures should be taken on the surface of the insulation masonry in contact with the pouring material;
(5) The pouring of refractory castables should be carried out continuously. Before the previous layer of castables sets, the second layer of castables should be poured completely. If the interval exceeds the setting time, it should be treated according to the construction joint requirements. Construction joints should be left on the centerline of the same row of anchor bricks;
(6) After construction, refractory castables should be cured according to the specified methods in the design, and should not be subjected to external forces or vibrations during the curing period.