Production process of lightweight thermal insulation brick
2. Use lightweight aggregates and combustibles to make thermal insulation bricks
Expanded perlite is a lightweight raw material, which can further reduce the bulk density and improve the thermal insulation performance; mullite fiber plays a reinforcing role to prevent the material from shrinking and cracking during drying and sintering; clay is the binding agent and plays the role of forming the matrix.
Raw materials used: combined clay, mullite fiber, expanded perlite, polystyrene waste foam ball, silica sol.
The production process is as follows: the bonding clay, expanded perlite powder and polystyrene waste foam balls are mixed uniformly. At the same time, use a stirrer to fully and evenly disperse the mullite fiber in the binder at a certain speed, and add water to mix into a slurry. Then, the powder and slurry are mixed and stirred until the mixture is dispersed into a uniform viscous substance. After a certain period of rest, through extrusion molding the raw material is made into bricks. After drying for two days at room temperature or several hours at 70°C, the finished product is sintered.
Next issue we will continue to introduce the use of traditional foam method to make anorthite thermal insulation bricks.Please stay tuned!
