Clay Insulation Refractory Bricks

The Al2O3 content of clay insulating refractory bricks is generally more than 40%, and the Fe2O3 content is less than 2.0-2.5%. The clinker is 65-85% and the bonding clay is 35-15% in the ingredients. The crushed bonding clay and the ground clinker are mixed and ground, and then mixed with the granular clinker to make semi-dry mud, which is formed under high pressure and fired at about 1400℃. The performance is good. Clay bricks are weakly acidic at high temperatures. Lightweight clay insulating bricks are clay insulating refractory materials with high porosity, low bulk density and low thermal conductivity.

Send Inquiry

Description

Clay insulating refractory bricks (fireclay insulating refractory bricks) are insulating refractory products with an Al2O3 content of 30% to 48% made from refractory clay as the main raw material. Refractory clay, floating beads, refractory clay clinker are used as raw materials, and binders and sawdust are added. After batching, mixing, molding, drying and firing, products with a volume density of 0.3 to 1.5 g/cm3 can be obtained. The commonly used production process is the burnout addition method with floating beads, and the foam process can also be used. Raw materials, binders and sawdust (1) The raw materials are refractory clay, clay clinker and floating beads. The chemical composition of floating beads fluctuates greatly. In order to obtain products that meet the quality standards, it is necessary to select clay-based insulating refractory bricks with an Al2O3 content greater than 30%, a Fe2O3 content less than 3%, and a refractoriness greater than 1610°C. Most of the floating beads are closed hollow balls with thin walls and high strength. Their volume density is 0.38-0.44 g/cm3, and their color is grayish white.

The particle size is 20-250/μm, of which 50-150/μm is more common, and the whole bead rate is greater than 95%. Inclusions can be removed by screening or rinsing. If rinsed, they should be dried or spun. (2) Both clinker fines and floating beads are lean aggregates. The floating beads are round or nearly round, with a smooth surface, fine particles, and a large specific surface area, which requires the binder to have a strong binding property. The main binders are: refractory clay, sulfite pulp waste liquid, aluminum sulfate, water glass, phosphoric acid and phosphates, dextrin, resin, etc. Refractory clay has high binding, dispersibility, plasticity, refractoriness and sintering properties. It is also cheap and abundant in resources. Therefore, refractory clay is the main binder. According to the product type, bulk density and technical requirements, add an appropriate amount of organic or inorganic binder. (3) Sawdust should be screened and the particle size should be less than 1-2 mm.

Clay Insulating Refractory Brick NG125-0.8

Bulk density(kg/m³)		≤800
Compressive strength(MPa)	Normal temperature	3.0
Thermal Conductivity(W/m.℃)	average temperature 350℃±25℃	≤0.35
Heating permanent line change ≤ 2% test temperature		1250

Hot Tags: clay insulation refractory bricks, China clay insulation refractory bricks manufacturers, suppliers, factory