Brief Analysis of Sunrise Refractory Hot Sale Mullite Insulation Brick

What is mullite light insulation brick?

 

Shaped lightweight heat-resistant refractory brick is a shaped block heat-resistant refractory product with a porous structure and heat insulation performance. Among them, the production and application of broken products are the most widely used. Shaped mullite products mainly refer to mullite lightweight heat-insulating bricks, which are a new type of heat-insulating material with mullite as the main crystal phase and bonded phase. Because mullite lightweight heat-insulating bricks have the advantages of high temperature strength, good high temperature stability, small thermal expansion coefficient, and good thermal shock resistance, they have been widely used in inner villages of kiln working surfaces in direct contact with flames. One of the hot spots.

What is the main raw material of mullite insulation brick?

 

The main raw materials of mullite insulation brick are as follows: clay, calcined alumina ≥99, D0.5 is 0.043 ~ 0.1mm), calcined mullite powder ≥65, D0.5 is 0.1 ~ 0.5mm, plate corundum ≥ 99.4, D0.5 is 0.043 ~ 0.2mm, the foaming agent used for kyanite and sillimanite is sodium dodecyl sulfonate, the burnout used is sawdust and polypropylene balls, and the binding agent is polyvinyl alcohol (PVA ).

 

Preparation method and proportion of mullite thermal insulation brick

Foam method: After the raw materials are pre-mixed for 4 hours according to the 1 # ratio in the table below, 30 ~ 35w% of water is added to mix the powder into a uniform and stable slurry; then the foaming agent is added with water and stirred at high speed to obtain a stable Foam; finally, mix the mud rack and foam evenly, inject it into a 40mmX 40mmX 160mm mold, and shake it slightly to remove large air bubbles. Place it at room temperature to dry naturally for 8-12 hours, release the mold, and bake at 10C for 24 hours. Fired at 15C and held for 3h to obtain mullite heat-resistant refractory bricks.

 

Machine pressure method: Dilute the polyvinyl alcohol into the experimental raw material and add the uniformly mixed powder, stir for 10-15 minutes, extrude into a 114mm * 65mm * 230mm green brick at a pressure of 5MPa, and bake at 110 ° C for 24h, then at 1550C The mullite heat-resistant refractory brick was obtained by firing and holding for 3 hours.

 

Extrusion method: After premixing the experimental raw materials for 4 hours, add 10 to 15 wt% of water and stir well, and then process the process of sleepy material and sludge to prepare 114mm * 65mm * 230mm green bricks by extrusion. After baking at 110C for 24 hours, it was fired at 1550C and held for 3 hours to obtain mullite heat-resistant refractory bricks.