What is fused mullite?
Fused Mullite is manufactured by fusing a mixture of high purity Bayer Alumina and pure Quartz in a tilting type arc furnace at a temperature around 2000 deg C. Fused Mullite is one of the main raw materials used by the refractory industry for applications requiring thermal shock resistance and corrosion resistance.
What is mullite Bricks?
Mullite Bricks are made of synthetic fused mullite or sintered mullite, pressed by selected shaping processes, and fired in high temperature furnaces. Zircon Mullite Bricks, like high alumina bricks and zirconia bricks, are used in the superstructure of glass melting tanks.
What is mullite used for?
Mullite is present in the form of needles in porcelain. It is produced during various melting and firing processes, and is used as a refractory material, because of its high melting point of 1840 °C.
What is zirconia mullite?
Fused Zirconia-Mullite, Fused Zirconia are highly recommended refractory raw materials. Fused, high purity zirconia-mullite grain is produced by electric furnace fusion of alumina and zircon sand. During melting, the zircon and alumina react to yield a mixture of mullite and zirconia.
What is high alumina bricks?
High Alumina Bricks are produced with select bauxite chamotte as main raw material, fired at 1450-1470 °C by advanced process with strict quality control. High Alumina bricks are extensively used in mining, metallurgy, cement, and chemical, refinery and refractory industries.
What is mullite made of?
mullite, any of a type of rare mineral consisting of aluminum silicate (3Al2O3·2SiO2). It is formed upon firing aluminosilicate raw materials and is the most important constituent of ceramic whiteware, porcelains, and high-temperature insulating and refractory materials.
How do you make mullite?
In the present study, mullite specimens and mullite/alumina composites are prepared by reaction sintering kaolinite and alumina at a temperature above 1000°C. The phase and microstructural evolution of the specimens and their mechanical properties are investigated.
What is fused zirconia?
Fused zirconia is produced from zircon sand, which is one of the minerals found in heavy mineral sand sedimentary deposits derived from the alteration of granitic or alkaline rocks. In order to produce fused zirconia, zircon sand is reduced and fused in an electric arc furnace under a temperature exceeding 2,600°C.
What is high alumina fireclay?
According to the description above of fireclay bricks, the High Alumina Bricks belong to the SiO2-Al2O3 system. The definition of High Alumina is that it has a Al2O3 content above 45%. The higher alumina content normally gives better refractoriness at higher temperatures in comparison with Fireclay Bricks.
What does alumina do in bricks?
Alumina is the main constituent of clay. It acts as a cementing material in raw brick. Brick clay is plastic due to the presence of alumina. This plasticity ensures that bricks can be molded.
How is mullite manufactured?
Commonly, mullite is fabricated from pure technical grade raw materials, making the manufacturing process expensive. An alternative to lowering the cost is the use of mining waste as silica (SiO2) and alumina (Al2O3) feedstock, which are the necessary chemical compounds required to manufacture mullite ceramics.
Is mullite crystalline?
Mullite, Al4+2xSi2–2xO10-x, is the only stable crystalline compound under atmospheric pressure. Mullite precursors have been prepared through various chemical processes to obtain homogeneous ones.