Mullite light heat-insulation brick based on flint clay and preparation method of brick

Abstract

The invention particularly relates to a mullite light heat-insulation brick based on flint clay and a preparation method of the brick. According to the technical scheme, the mullite light heat-insulation brick is prepared from the raw materials of 20-38 wt% of the flint clay, 20-32 wt% of kyanite, 20-32 wt% of clay and 14-26 wt% of alpha-alumina micro powder, and saw dust accounting for 30-50% of the weight of the raw materials, mullite fibers accounting for 5-11% of the weight of the raw materials and a binding agent accounting for 10-35% of the weight of the raw materials are additionally added; the materials are stirred for 6-8 h at room temperature, and then material aging, shaping and natural drying are conducted; an obtained product is baked for 12-24 h at the temperature ranging from 110 DEG C to 210 DEG C, heat preservation is conducted for 2-5 h at the temperature ranging from 1,150 DEG C to 1,450 DEG C, and the mullite light heat-insulation brick based on the flint clay is prepared. The preparation method has the advantages of being low in cost and simple in technology, and the prepared mullite light heat-insulation brick based on the flint clay has the advantages of being low in heat conductivity coefficient, low in volume density, low in linear shrinkage rate after burning and high in compressive strength.

Description

technical field [0001] The invention belongs to the technical field of mullite lightweight heat insulating bricks. It specifically relates to a mullite lightweight heat-insulating brick based on coke gemstones and a preparation method thereof. Background technique [0002] With the rapid development of lightweight thermal insulation materials, it is very common to use clay to prepare lightweight thermal insulation refractory materials. However, there are not many applications of coke gemstones in lightweight insulation materials. Even if there is a small amount of coke gemstones mixed into lightweight heat insulating materials, the preparation process is complicated, the molding is difficult, the firing system is demanding, and the compressive strength of the product is not high. Its national standard (DLG150-0.8L) gdd bulk density is less than 0.8g / cm 3 , the compressive strength is greater than 2.5MPa, and the thermal conductivity at 35025°C is less than 0.35W / (m K), wh...

AI Technical Summary

Problems solved by technology

Then add foam made of 0.1~0.5wt% foaming agent as raw material, stir, and then add 0.5~2wt% gelling agent, 0.1~1wt% thermosetting water-soluble polymer compound and 0.5~2.5wt% coagulation accelerator Mullite lightweight insulation bricks are prepared by foaming and pouring. This method realizes the utilization of burnt stones in lightweight insulation materials to a certain extent, but its main defects are: (1) The preparation process is complicated; (2) It is difficult to form by casting method; (3) The production cost is high; (4) The compressive strength is low

But its main disadvantages are: (1) complex preparation process; (2) high cost; (3) low compressive strength