Is calcium oxide a refractory material?
The CaO is occurring in nature as a relatively pure limestone (CaCO3). The successful application of this highly refractory CaO material with melting point (about 2600 °C) would bring about economical solution of shortage of other raw materials that may have better refractory properties.
Which material is used as refractory material?
Refractory materials The oxides of aluminium (alumina), silicon (silica) and magnesium (magnesia) are the most important materials used in the manufacturing of refractories. Another oxide usually found in refractories is the oxide of calcium (lime). Fire clays are also widely used in the manufacture of refractories.
What are the types of refractory materials?
The typical refractory materials include fireclay refractories, high alumina refractories, silica brick, Magnesite refractories, Chromite refractories, Zirconia refractories, Insulating materials and Monolithic refractory.
Why are CaO and MgO used for making refractory bricks?
Furthermore, MgO–CaO refractories are beneficial to removing inclusions from molten steels; thus, they have been considered to be one of the effective refractory types for processing clean steel products [2,4,9].
How is CaO used as flux?
-Calcium oxide is the principle flux in medium and high temperature glazes, beginning its action (within the glaze) around 1100C. It must be used with care in high-fire bodies because its active fluxing action can produce a body that is too volatile (melting if slightly overfired).
What are the two main types of ceramic refractory materials?
Refractory products generally fall into one of two broad categories: preformed shapes or unformed compositions, often called specialty or monolithic refractories. Then, there are refractory ceramic fibers, which resemble residential insulation, but insulate at much higher temperatures.
How many types of refractory are?
TYPES OF REFRACTORIES On the basis of chemical nature: 1)Acid refractories 2)Basic refractories 3)Neutral refractories Based on fusion temperature: Normal refractory: fusion temperature of 1580 ~ 1780 °C (e.g. Fire clay) High refractory: fusion temperature of 1780 ~ 2000 °C (e.g. Chromite) Super …
What type of flux is CaO?
CaO is a strong flux but it can cause crazing Adding a flux only reduces the SiO2 and Al2O3, this pushes the thermal expansion upwards.
What mineral is CaO?
Calcium oxide
Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature….Calcium oxide.
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| Chemical formula | CaO |
What is the content of the basic refractory material?
Basic Refractory is refractory material contains magnesium oxide and calcium oxide. Basic refractory has high refractoriness and strong alkaline slag resistance. The major basic refractory is the refractory with the content of magnesia, dolomite and limestone.
What makes a low calcium aluminate refractory cement?
Low-calcium aluminate refractory cement is made of high-quality bauxite and limestone in proper proportion after sintering and grinding. Its mineral composition is mainly calcium aluminate, accounting for 60% – 70%, and the refractoriness is above 1650 ℃.
What kind of refractory material is phosphate bonded?
A phosphate-bonded material would have phosphorus pentoxide (P 2 O 5) in lieu of calcium oxide (CaO). All basic or conventional refractory materials are primarily used to prevent gas and fire from escaping from the boiler furnace.
Why are refractory materials important in a boiler?
Paying attention to the refractory material selection on new or existing boilers can and will help ensure efficient boiler operation and contribute to energy savings (from using less fuel) as well as preventing unnecessary steam-generation interruption.