Fired perforated brick

Abstract

The invention relates to a fired perforated brick which comprises the following ingredients in percentage by weight: 35-38 percent of shale powder, 17-20 percent of a volcaniclastic rock mixture, 25-30 percent of high-viscosity attapulgite clay powder, 5-12 percent of waste residues adopting serpentine ore and 5-10 percent of sludge settled in a sewage treatment plant. The preparation method comprises the following steps: preparing a green perforated brick; naturally airing the green perforated brick, and roasting the brick in a tunnel kiln, wherein the roasting process is divided into four stages, namely the first roasting stage refers to a gradually controlled gradient temperature rise process, and the temperature is gradually raised from ambient temperature to 500-600 DEG C in five hour, the second stage refers to a rapid temperature rise process, and the temperature is rapidly raised from 500-600 DEG C to 980-1100 DEG C in an hour, the third stage refers to a constant temperature sintering process, and the brick is sintered at the temperature of 980-1100 DEG C for 3-5 hours, and the fourth stage refers to a cooling stabilization process; and controlling the temperature in the kiln so as to slowly reduce the temperature, and taking out the sintered perforated brick finished product.

Description

technical field [0001] The invention relates to the technical field of porous bricks for construction, more specifically, to a sintered porous brick. Background technique [0002] New wall materials mainly refer to building materials mechanized from non-clay resources such as sandstone, shale, industrial solid waste, and construction residual soil, which have the functions of protecting land, protecting the environment, saving energy, utilizing waste, increasing strength and economical Applicable and other characteristics, compared with solid clay bricks, shale bricks have the biggest advantages in that their production does not destroy cultivated land and consumes less energy, which is in line with the national technological development policy. [0003] Shale is a rock formed by the extrusion of clay in the crustal movement. It has sheet-like or thin-sheet bedding. It is easy to break into pieces when hit with a hard object. Shale is not viscous, and its plasticity and wate...

AI Technical Summary

Problems solved by technology

[0003] Shale is a rock formed by the extrusion of clay in the crustal movement. It has sheet-like or thin-sheet bedding. It is easy to break into pieces when hit with a hard object. Shale is not viscous, and its plasticity and water permeability are poor. Blocky shale can only be processed into shale bricks after being crushed very finely. Otherwise, the dried shale bricks will have many cracks, and during the sintering process, the crystals will be heated unevenly and burst, resulting in high defective rate and increased Cost of production

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