Lightweight refractory insulation materials refer to thermal insulation materials with high porosity, low density and low thermal conductivity. It is used as fire insulation material in industrial kilns and other thermal equipment. Compared with general lightweight insulation bricks, it has poor slag corrosion resistance, mechanical strength and wear resistance, and has high shrinkage at high temperature. There are various classification methods:
(1) Classification by bulk density. Those with a bulk density of 0.3-1.3g/cm3 are lightweight bricks; those with a bulk density below 0.3g/cm3 are ultra-light bricks.
(2) Classified by operating temperature. The operating temperature of 600~900℃ is low temperature fireproof insulation material; 900~1200℃ is medium temperature fireproof insulation material; if it exceeds 1200℃, it is high temperature fireproof insulation material.
(3) Classified by product shape. One is the shaped lightweight insulation brick, including clay, high alumina, siliceous and some pure oxygen compounds lightweight insulation materials. They are widely used in modern ceramic kilns mainly because of their light weight, convenient construction and other characteristics, it is relatively easy to operate. The tunnel kiln, roller kiln, and other long-shaped kilns such as push-plate kilns often used in the ceramic industry. In these kilns there are preheating zones, heat preservation zones, firing zones, cooling zones, etc. The choose of light thermal insulation materials of right temperature according to the different temperature between different sections is particularly important for the energy saving of the kiln.
Next issue we will continue to introduce light weight refractory insulation brick. Please stay tuned.
