Lightweight Mullite Insulation Brick as one kind of the insulating fire bricks. The production process of Lightweight Mullite Insulation Brick currently uses a grouting method. After curing, it is naturally cured until it is demolded, moved to a forced dryer, and then fired at high temperature. The fired body is finished by Mechanical Polishing. The production process is as follows:
Production Process of Lightweight Mullite Insulation Brick
Overview of the Production Process of Lightweight Mullite Insulation Brick
Firstly, add refractory raw materials, stir well, add sawdust powder and stir well, then add water.
The amount of water is generally controlled at about 50%, so that the slurry maintains good fluidity and is convenient for molding. At the same time, it will not cause too much water and affect the curing time.
In the process of stirring and mixing, additional additives such as water reducing agent and green body reinforcing agent are also added.
After the mud is mixed into a mud, Additive A is added and mixed again.
The prepared mud is injected into the mold for molding, and it is allowed to stand for curing at room temperature to disperse and evaporate the excess water in the mud. Generally, it can be demolded after standing for about 24 hours. At this time, the moisture of the mud is about 35%. When the moisture drops to 25% ~ 30%, the drying car on the green body enters into the dryer for forced drying, and the drying temperature can reach up to 110 ℃;
After drying for 24 to 48 hours, when the water content of the green body is less than 2%, it is fired in a kiln. Firing is carried out in a 20m3 gas shuttle kiln. The firing temperature is 1 300 ° C and the temperature is maintained for 4 hours. After the fire is stopped, the temperature is lowered below 200 ° C and the kiln is discharged. The fired brick is mechanically polished and finished.
The appearance of the Lightweight Mullite Insulation Brick product is white, and the pores are mostly micro pores of about 1mm. Compared with the appearance of Lightweight Mullite Insulation Brick products with EPS granules as pore-forming agents, the pores are smaller and more uniform, and the texture is more delicate.
Using sawdust alone as a pore-forming agent, using grouting molding method and adding a certain amount of additives, can produce mullite lightweight thermal insulation brick with excellent performance. The process is simple, suitable for mass production, and does not use EPS raw materials, which saves costs and is environmentally friendly. The pure sawdust Lightweight Mullite Insulation Brick has a density of about 0.57g · cm-3 and a thermal conductivity of 0.16W · (m · K) -1 at 400 ° C. The thermal conductivity of the mullite insulation product is better than that of common products, and the energy saving effect is significant. It has very good economic and social benefits.
Rongsheng Fire Bricks Manufacturer is one of the experienced refractory manufacturer. With more than 10 years develop, we have own two refractory materials factories. one is mainly for the refractory bricks and another is the refractory castables. If you are in need of the Lightweight Mullite Insulation Brick, please leave us your need, we will contact you as soon as possible.
