How many types of refractory bricks are there?
There are mainly three varieties of refractory bricks.
What are refractory bricks made of?
Most refractory bricks are made with fireclay, which contains primarily silica and alumina. Refractory bricks that withstand the highest temperatures, over 3,000 degrees Fahrenheit, contain more alumina. Most refractory bricks also contain small amounts of magnesium, calcium, potassium, iron and titanium.
What requirements must furnace refractories fulfill?
OF REFRACTORIES The general requirement which a refractory material is to fulfill may be summarized as follows: 1. Ability to withstand high temperature. 2. Ability to withstand temperature fluctuation.
What is refractory raw material?
Minerals commonly used for refractories include (but are not limited to) alumina, bauxite, graphite, kaolin, magnesia and zirconium. These minerals are produced globally but, in some cases, not always of grades suitable for refractory applications (e.g., alumina and bauxite).
What are the types of refractories?
Depending on temperatures and service conditions of the applications such as boilers, furnaces, kilns, ovens etc, different types of refractories are used.
- Fireclay refractories.
- Silica brick.
- High alumina refractories.
- Magnesite refractories.
- Chromite refractories.
- Zirconia refractories.
What is a example of refractory?
The definition of refractory is stubborn or hard to manage, or heat resistant. An example of someone who is refractory is a person who refuses to listen to the rules. An example of something refractory is a material like silica or alumina that are difficult to melt.
What is a refractory infection?
(reh-FRAK-tor-ee) In medicine, describes a disease or condition that does not respond to treatment.
What are refractory services?
Refractory construction is a specialized process. Our refractories are non-metallic materials that are applicable for structures or components for systems that are exposed to environments above 1,000 °F (811 K; 538 °C). Critical applications demand an exceptional level of refractory performance and reliability.
What is acid refractory?
Acid refractories are those which are not attacked or affected by acidic materials, but easily attacked by alkalis (basic slags). Acid refractories include substances such as zirconia (ZrO2), alumina (Al2O3), silica (SiO2) and fire clay brick refractories. …
What is a refractory person?
adjective [usu ADJ n] Refractory people are difficult to deal with or control, usually because they are unwilling to obey orders.
Which of the following is an acid refractory material?
Most acidic refractory materials are alumina and silica (quartz).
What are the advantages of refractories?
More heat-resistant than metals, they are used to line the hot surfaces found inside many industrial processes. In addition to being resistant to thermal stress and other physical phenomena induced by heat, refractories can withstand physical wear and corrosion caused by chemical agents.
What are the properties of refractories?
Important properties of refractories include chemical composition, bulk density, apparent porosity, apparent specific gravity and strength at atmospheric temperatures. These properties are frequently among those which are used as ‘control points’ in the manufacturing and quality control process.
Why refractory material is used in furnace?
These are the substances which can withstand very high temperature without meltning or becoming soft.
What are the two main types of ceramic refractory materials?
Refractory ceramics include technical ceramics, thermal ceramics, high temperature ceramics (HTCs), and ultra-high temperature ceramics (UHTCs), the latter of which can withstand temperatures in excess of 2000 °C.
Which property of refractories is the most important for top section of the blast furnace?
Question 34 : Which property of refractories is the most important for top section of the blast furnace? Resistance to abrasion.