The invention discloses a method for preparing an insulating
brick by utilizing
sludge in lakes in central plains of China and belongs to the technical field of
waste treatment and building materials.The insulating
brick is prepared from the following raw materials in parts by
mass: 45-55 parts of lake
sludge; 10-15 parts of
clamshell; 20-35 parts of
coal cinder; and 5-15 parts of
plant fallen leaves. The specific preparation method comprises the following steps of: mixing lake
sludge and
plant fallen leaves according to a certain ratio; the uniformly stirring the lake sludge and the
plant fallen leaves to obtain sludge
slurry; crushing clamshells and
coal cinder; carrying out ball milling to obtain
powder; weighing the
clamshell powder and
coal cinder powder according to a certain ratio;adding the sludge
slurry; performing uniform stirring to obtain mixed
slurry; carrying out sealed aging at
room temperature for 24 hours; and carrying out
compression molding on the slurry in a brickmaking mold to obtain a green
brick blank; and putting the green brick blank into a
kiln, after preheating the green brick blank for a period of time,
sintering the preheated green brick blank according to a certain temperature
system; and carrying out
air cooling on the sintered green brick blank to
room temperature along with the
kiln to obtain the insulating brick. The
porosity of the insulating brick is 18.0-27.3%; the
compressive strength of the insulating brick is 21.0-27.5 MPa; the heat
conductivity coefficient of the insulating brick is 0.38-0.51 W / (m.K); the reuse of wastes such as sludge, clamshells, coal cinder and plant fallen leaves in the lakes in the central plains of China is realized, environmental
pollution is reduced, and the production cost of building materials is reduced.