Thermal insulation refractory material refers to refractory material with high porosity, low bulk density and low thermal conductivity. Thermal insulation refractory material is also called lightweight refractory material. It includes thermal insulation refractory products, refractory fibers and refractory fiber products.
The characteristics of thermal insulation refractories are high porosity, generally 40% to 85%; low bulk density, generally lower than 1.5g/cm3; low thermal conductivity, generally lower than 1.0W (m·k). It is used as The thermal insulation material of industrial kiln can reduce the heat dissipation loss of the kiln, save energy, and reduce the weight of thermal equipment. The thermal insulation refractory material has poor mechanical strength, wear resistance and slag corrosion resistance, and is not suitable for furnaces. The load-bearing structure of the kiln and the parts that directly contact the slag, charge, molten metal, etc.
Thermal insulation refractory products
Thermal insulation refractory products refer to refractory products with a porosity of not less than 45%. There are many types of thermal insulation refractory products. The main classification methods are as follows:
(1) According to the use temperature, it is divided into low temperature heat insulating refractory (use temperature is 600～900°C), medium temperature heat insulating refractory (use temperature is 900～1200°C) and high temperature heat insulating refractory (use temperature is more than 1200°C) °C).
(2) According to the bulk density, it is divided into general lightweight refractories (bulk density of 0.4 ~ 1.0g/cm3) and ultra-low lightweight refractories (bulk density below 0.4g/cm3).
(3) According to the raw materials, it is divided into clay, high alumina, siliceous and magnesium heat-insulating refractories.
(4) According to the production method, it is divided into heat-insulating refractory materials such as burnout addition method, foam method, chemical method and porous material method.
(5) According to the shape of the product, it is divided into shaped thermal insulation refractory products and amorphous thermal insulation refractory products.
Thermal insulation refractory products and dense refractory products are different, the main methods are burnout addition method, foam method, chemical method and porous material method: