Detailed Explanation of Refractory Materials for Various Industrial Kilns
What are the classifications of refractory materials for industrial kilns? Generally, they can be divided into four main categories: refractory materials for glass tank furnaces, cement kilns, ceramic kilns, and coke ovens. For specific details, please refer to the following explanation provided by experts from Henan Refractory Materials Factory.
I. Refractory Materials for Glass Tank Furnaces
Based on the working environment of glass tank furnaces, considering factors such as chemical erosion, mechanical abrasion, temperature fluctuations, and high-temperature effects, the selection of kiln materials mainly includes the following series:
- Al2O3-SiO2 Series: Mainly includes clay bricks and silica bricks.
- Al2O3-ZrO2-SiO2 Series: Mainly includes zircon bricks and fused zirconia corundum bricks.
- ZrO2-SiO2 Series
- MgO-Al2O3, MgO-Cr2O3, MgO-SiO2 Series
- Insulating Materials
II. Refractory Materials for Cement Kilns
Refractory materials for cement kilns are diverse and should be used in a comprehensive manner. The main types include:
- Basic Refractory Materials: The main types are magnesia-chrome bricks, magnesia bricks, spinel bricks, and dolomite bricks. Magnesia-chrome bricks can be further divided into ordinary magnesia-chrome bricks, direct-bonded magnesia-chrome bricks, and semi-direct bonded magnesia-chrome bricks.
- Alumino-silicate Refractory Materials: Apart from ordinary clay bricks and high alumina bricks, cement kilns also require special types that are wear-resistant, alkali-resistant, and temperature-resistant. These include phosphate-bonded high alumina bricks, phosphate-bonded wear-resistant high alumina bricks, anti-spalling high alumina bricks, and alkali-resistant semi-acidic clay bricks.
- Insulating Refractory Materials: Mainly includes silica cover plates and lightweight insulating bricks.
- Castables: Cement kiln castables include high-strength high-alkali castables, anti-skinning castables, low-cement refractory castables, kiln mouth special castables, coal injection pipe castables, tertiary air duct special castables, and wear-resistant castables.
III. Castables for Ceramic Kilns
The wall material inside the kiln requires high-temperature resistance, and the type of refractory material used depends on the firing temperature of the products.
- Clay Refractory Bricks: Used at temperatures below 1300℃.
- High Alumina Bricks: Used at temperatures between 1300℃ and 1400℃.
- Silica Bricks: Used at temperatures between 1400℃ and 1500℃.
- Magnesia-Alumina Bricks: Used at temperatures between 1500℃ and 1600℃.
- Corundum Bricks: Used at temperatures below 1800℃.
IV. Refractory Materials for Coke Ovens
1.Refractory Materials for Carbonization Chambers: Previously, clay bricks were mostly used, but now there is a trend towards using high-quality high alumina bricks, sillimanite bricks, and andalusite bricks.
2.Refractory Materials for Combustion Chambers: The combustion chamber shares the furnace wall with the carbonization chamber, and the same bricks are used.
3.Refractory Materials for Furnace Tops: The area around the coal charging holes on the furnace top, due to large temperature fluctuations, is built with clay bricks, while other parts are built with silica bricks.
Refractory Materials for Inclined Flues: Inclined flues connect the combustion chamber with the regenerator, requiring stable brick structures that can resist thermal stress. Small coke ovens use clay refractory bricks, while medium and large coke ovens use silica bricks.
4.Refractory Materials for Regenerators: The single standing walls, partition walls, bottom, and checker brick structures of small coke oven regenerators are built with clay bricks, while the middle and upper parts of medium and large coke oven regenerators are entirely built with silica bricks for uniform expansion.
5.Refractory Materials for Small Flues: Small flues located at the bottom of the regenerator connecting to the chimney are entirely lined with clay bricks.
V. Refractory Materials for Fluidized Bed Incinerators
The incineration temperature of fluidized bed incinerators is 750-870℃. Due to the turbulent state of the materials (carrier and waste residue) inside the furnace, the lining material requires heat-resistant and wear-resistant refractory materials. The furnace uses a total thickness of 250mm of heat-resistant and wear-resistant concrete castable. The inner layer uses 150mm of lightweight heat-resistant concrete as an insulating layer; the outer layer (working layer) is cast with 100mm thick phosphate aluminum bauxite concrete [bauxite clinker: low-calcium aluminate cement: aluminum hydroxide fine powder: phosphate aluminum solution 100:25:25:20-24 (Wt)], or built with lightweight insulating bricks and first-grade high alumina bricks (L2-65).
Your message must be between 20-3,000 characters!
