Preparation method of light mullite brick

Abstract

The invention relates to a preparation method of a light mullite brick, belonging to the field of refractory material. The light mullite brick consists of main material and filler, the main material contains the following raw materials by weight percent: 20-50 wt% of kaolin, 15-35 wt% of fine powder of calcined coal gangue and 20-50 wt% of fine powder of recycled material, and the filler contains the following raw materials by weight percent: 15-61 wt% of coal dust, 3-28 wt% of polystyrene globule, 8-30 wt% of sawdust and 5-32 wt% of waste paper pulp. The raw materials are simple in category and low in costs. The preparation method adopts the optimum scheme applying the filler, so the production process is simpler and easier to control. The coal dust and the paper pulp are added, so the cost of the fuel is reduced, and the service performance of the finished light mullite brick is ensured. The light mullite brick prepared through the method reaches the minimum volume density of 0.4g/cm<3> and the average compressive strength of being equal to or above 1.2 MPa, and the heat conductivity coefficient of the light mullite brick under at 350 DEG C is less than 0.15w/m.k.

Description

technical field [0001] The invention relates to a method for preparing lightweight mullite bricks, belonging to the field of refractory materials. Background technique [0002] Ultra-light shaped refractories are the leading research direction in the refractory industry, and their main function is to be used for thermal insulation of industrial kiln linings. Due to its ultra-low bulk density, the thermal conductivity is significantly better than conventional lightweight insulation bricks. The lower the bulk density, the smaller the thermal conductivity of lightweight insulation bricks, the better their thermal insulation performance and more energy-saving. At the same time, the compressive strength of the product decreases rapidly as the bulk density decreases. Increasing the amount of filling materials is a more effective way to reduce the bulk density, but with the increase of filling materials, especially the addition of conventional filling materials such as polystyren...

AI Technical Summary

Problems solved by technology

The increase in the proportion of kaolin will affect its performance due to excessive ignition loss of raw materials, resulting in cracks in fired products

The softness of polystyrene pellets and wood powder itself results in that when the bulk density of lightweight bricks drops to 0.55g / cm 3 The extrudability of the mud material is greatly reduced, resulting in an increase in the difficulty of molding