A kind of mullite lightweight heat insulation brick and preparation method thereof

Abstract

The invention specifically relates to a mullite lightweight heat-insulating brick and a preparation method thereof. The technical solution is: the raw material and content of the mullite lightweight heat-insulating brick are: 40-48wt% of coke gemstone, 14-38wt% of kyanite, 6-16wt% of clay, α-Al 2 o 3 The micro powder is 14-24wt%; the binder is 15-20wt% of the raw material, and the pore-forming agent is 45-60wt% of the raw material. According to the content of the above-mentioned raw materials, binders and pore-forming agents, the α-Al 2 o 3 Mix micropowder with pore-forming agent, wet mill for 8-10 hours to obtain homogeneous mud; then stir homogeneous mud, burnt gemstone, kyanite, clay and binder evenly, trap material, shape, bake, Keep warm for 3~5h under the condition of ℃ to get mullite lightweight insulation brick. The invention saves resources, has a simple process and is environmentally friendly, and the prepared mullite lightweight heat-insulating brick has good thermal stability, low thermal conductivity, small bulk density, low linear shrinkage after firing, high compressive strength and heat insulation. The effect is good.

Description

technical field [0001] The invention belongs to the technical field of lightweight heat insulating bricks. It specifically relates to a mullite lightweight heat-insulating brick and a preparation method thereof. Background technique [0002] At present, affected by the lack of energy at home and abroad and the price of available energy, the development of new energy-saving refractory materials has a huge market demand at home and abroad. The research and development of environmentally friendly heat-insulating refractory materials and the preparation of low-density, low thermal conductivity, high-strength, and low-cost lightweight heat-insulating materials have become the mainstream direction. [0003] "A high-silicon mullite with the structure of gramineous plants and its preparation method" (CN201410457026.9) patent technology, using 30~90wt% aluminum sol as impregnating agent in normal pressure or 10 3 ~10 4 Soaking under Pa conditions, stirring evenly; then baking the ...

AI Technical Summary

Problems solved by technology

Although the manufactured product has high compressive strength, its defects are: complex preparation process, high thermal conductivity of the product, and high linear shrinkage

[0004] "A clay lightweight brick and its preparation method" (CN103435332A) patented technology, the patented technology uses 30~40wt% kyanite or coke gem, 35~45wt% fly ash and 15~35wt% plastic clay As a raw material, add 35~55wt% pore forming agent or 2~4wt% polystyrene balls of the raw material, and add 6~10wt% binder of the raw material, mix well, granulate, and then pass the semi-dry method Lightweight insulation bricks are prepared by vibration and pressure molding. Although the products produced have high compressive strength and low bulk density, the disadvantages are: complex preparation process and large line change rate after firing

Although the manufactured products have low bulk density and high compressive strength, the disadvantages are that the line change rate after firing is too large and the thermal conductivity is too large