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The difference between heavy refractory bricks and lightweight refractory bricks
Heavy refractory bricks are high-temperature and wear-resistant refractory materials with high operating temperatures. They are mostly used as working layers or permanent layers of industrial kilns to prevent high-temperature solutions from damaging the kiln body and protect the insulation layer materials. Lightweight refractory bricks are heat-insulating bricks with low operating temperatures. They are mostly used as insulation layer materials of kilns or thermal equipment to reduce heat loss and save energy consumption.
Take heavy high-alumina bricks and lightweight high-alumina bricks (high-alumina polylight bricks) as examples to illustrate their differences:
(1) Different production processes. Heavy high-alumina bricks use high-alumina bauxite clinker as the main raw material, soft clay and waste pulp liquid as binders, and are formed by high-pressure molding, drying, and high-temperature firing. Lightweight high-alumina bricks are made of high-alumina bauxite clinker mixed with clay binder and foaming agent, cast and fired at high temperature. They are both sintered refractory bricks, one is formed by high pressure molding and the other is cast.
(2) Different volume densities. The bulk density of heavy high-alumina bricks is 2.3-2.65g/cm3, the bulk density is dense, the porosity is low, less than 23%; the bulk density of light high-alumina bricks is 0.6-1.5g/cm3, the bulk density is small, and the porosity is high and greater than 45%.
(3) Different refractory temperatures. The refractory temperature of heavy high-alumina bricks is around 1580-1790 degrees, and the high temperature resistance is good. The use temperature of light high-alumina bricks is around 1350-1500 degrees.
(4) Different use parts. The higher refractory temperature of heavy high-alumina bricks can be used in parts in contact with slag or solution, with low porosity and strong anti-permeability. Light high-alumina bricks have a low use temperature, high porosity, and cannot come into contact with flames or slag. Slag can easily penetrate the interior of the brick body and damage the brick body. They are mostly used as thermal insulation materials.
