The main purpose of refractory material is
to contain the heat generated by combustion
, the material has a high melting point that maintains it’s structure at very high temperatures.
What is refractory work?
Refractory jobs involve working with
refractory materials and equipment
, such as a furnace, broiler, and kiln. … A refractory bricklayer or refractory mason also works to build ovens and other structures for containing heated materials such as molten metal.
What is refractory used for?
Refractories are materials that are
resistant to high temperature
, used predominantly as furnace linings for elevated temperature materials processing and other applications in which thermomechanical properties are critical.
Why is refractory material needed?
Refractory products must
withstand high temperatures and corrosive media
, e.g., as a furnace lining in high temperature furnaces. … Refractory materials used as furnace linings require a certain minimum strength and creep resistance to ensure that they do not rupture or creep under their own weight.
Why refractory is used in furnace?
Insulating refractories are used
to reduce the rate of heat loss through furnace walls
. These refractories have low thermal conductivity due to a high degree of porosity, with a desired porous structure of small, uniform pores evenly distributed throughout the refractory brick in order to minimize thermal conductivity.
Which is a basic refractory?
Refractory material is a material that is resistant to decomposition of heat, pressure or chemical attack and retains strength and form temperatures. The basic refractory materials include
alumina, silica, magnesia and lime
.
What is refractory and example?
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.
Why refractory dry out is required?
When refractory areas are installed inside a boiler, such as a screen seal, they are exposed to higher stresses, erosion issues, and elevated temperatures. These areas of refractory need the
strengths that only a complete dry out can provide
. … This means the gas temperature for the hold points may have to be estimated.
What are the requirements of good refractory?
- It should be able to withstand high temperatures generated in the furnace. …
- It should be able to withstand sudden alternating heating and cooling, i.e., thermal shocks.
- It should be able to withstand abrasion and rough usage.
What does refractory disease mean?
Listen to pronunciation. (reh-FRAK-tor-ee) In medicine, describes
a disease or condition that does not respond to treatment
.
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 refractory materials?
- Fireclay refractories. …
- Silica brick. …
- High alumina refractories. …
- Magnesite refractories. …
- Chromite refractories. …
- Zirconia refractories.
What is refractory made from?
What Are Refractories Made Of? Refractories are produced from
natural and synthetic materials
, usually nonmetallic, or combinations of compounds and minerals such as alumina, fireclays, bauxite, chromite, dolomite, magnesite, silicon carbide, and zirconia.
Which of the following is natural refractory?
Explanation:
Chromite
, along with graphite, is a common neutral refractory material. Chromite has an approximate fusion temperature of 2180
o
C while that of graphite is 3000
o
C. Dolomite and magnesia are basic refractories, whereas silica is an acid refractory.
What are the general requirements of a refractory material?
The general requirements of a refractory material can be summed up as: 1)
Its ability to withstand high temperatures and trap heat within a limited area like a furnace
; 2) Its ability to withstand action of molten metal , hot gasses and slag erosion etc; 3) Its ability to withstand load at service conditions; 4) Its …
What are refractory bricks made of?
Principal raw materials for firebrick include fireclays, mainly
hydrated aluminum silicates; minerals of high aluminum oxide content, such as bauxite, diaspore, and kyanite
; sources of silica, including sand and quartzite; magnesia minerals, magnesite, dolomite, forsterite, and olivine; chromite, a solid solution of …
