Product introduction:

Scorched gemstone is another name for hard clay clinker, which is made by sintering raw scorched gemstones at a high temperature of 1250°C to 1350°C. The main mineral of scorched gemstones is kaolin. A series of physical and chemical changes occur during the high-temperature sintering process, which releases crystal water, structural water and a small amount of organic matter, shrinks and compacts in volume, and finally forms mullite phase, cristobalite phase and a small amount The glass phase.

Charred gemstone, a high-quality hard refractory clay. The raw ore is gray, gray, gray and black, with fine structure, high hardness, non-dispersing in water, low plasticity, and conchoidal fracture.

The standard Al2O3 content of scorched gemstone ore is 38%, after calcination, the Al2O3 content is about 44%, and Fe2O3<2%. The composition is stable, the texture is uniform, the structure is dense, and the section is shell-shaped and white. It is used to produce high-quality clay refractory materials. The technical term is first-grade hard clay clinker.

The main chemical components are AL2O3 and SiO2, accompanied by a small amount of Fe2O3 and trace amounts of Na2O and K2O. The main mineral is kaolin.

After being calcined at high temperature, the scorched gemstone has the characteristics of stable volume, high strength and low water absorption. The indicators for measuring the sintering degree of charred gemstones generally include true specific gravity, bulk density, porosity, water absorption, and shrinkage rate. The water absorption rate of the sintered scorched gemstone is less than 5%, and the volume density is greater than 2.55g/cm3.