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They are materials , usually bricks, made with silicon oxides, that will withstand extremely high heat, without decomposition or chemical reaction.
e.g. Blast Furnaces are internally lined with refactory bricks to with stand tha 1100 oC temperature of the furnace. The metal shell/chassis of the furnace would melt. Outside these refractory bricks is a water jacket to prevent heat escaping, into the outside environment.
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What is refractory scrap?
Refractory scrap refers to discarded or waste materials that have been used in high-temperature applications, such as furnaces, kilns, or reactors. These materials often consist of refractory bricks, castables, or coatings that have become worn out or damaged during their service life. Refractory scrap can be recycled or repurposed for use in the production of new refractory products.
How moisture content in refractory affect performance of refractory?
Moisture content in refractory materials can lead to thermal spalling and cracking when exposed to high temperatures. It can reduce the strength and lifespan of the refractory material by promoting thermal shock and weakening its structure. Additionally, moisture can chemically react with certain refractory materials, causing them to lose their properties and effectiveness in high-temperature applications.
What is a common refractory material?
A common refractory material is alumina, which is an oxide of aluminum. Alumina has high temperature resistance and is commonly used in industrial furnaces and kilns due to its ability to withstand extreme heat.
What is a refractory element?
A refractory element is an element that has a high melting point or heat resistance, making it suitable for use in high-temperature applications like furnaces or jet engines. These elements are often used as components in materials that need to withstand extreme heat without deforming or melting. Examples of refractory elements include tungsten, tantalum, and niobium.
What is permanent linear change in refractory material?
Shrinkage Refractory materials can undergo mineral formations or phase transformations when heated. These phase changes may result in either volume expansion or reduction. Upon cooling to room temperature, the material will possibly be larger or smaller than the original dimensions. This is evaluated by reheat tests, which are run at temperatures prescribed by ASTM for each class of refractory. This is reported as permanent linear and volume change.
What is refractory scrap?
Refractory scrap refers to discarded or waste materials that have been used in high-temperature applications, such as furnaces, kilns, or reactors. These materials often consist of refractory bricks, castables, or coatings that have become worn out or damaged during their service life. Refractory scrap can be recycled or repurposed for use in the production of new refractory products.
How moisture content in refractory affect performance of refractory?
Moisture content in refractory materials can lead to thermal spalling and cracking when exposed to high temperatures. It can reduce the strength and lifespan of the refractory material by promoting thermal shock and weakening its structure. Additionally, moisture can chemically react with certain refractory materials, causing them to lose their properties and effectiveness in high-temperature applications.
Differences between afbc and cfbc boilers?
(fbc) boiler to heat the Water that is mixed with a refractory material. With warming water temperatures will produce refractory materials that will ignite the oil in the water. The granular refractory materials are mixed with water. Refractory materials are heated in water to take it. c) boiler column. The steam comes out vertically. A) horizontal boiler. The steam comes out horizontally.
What has the author Charles A Schacht written?
Charles A. Schacht has written: 'Refractory linings' -- subject(s): Thermomechanical properties, Refractory materials
What are labile and refractory components?
Labile components are organic materials in the soil that decompose quickly, such as fresh plant residues. Refractory components are organic materials that decompose slowly, like lignin and humus. The distinction between labile and refractory components is important for understanding nutrient cycling in ecosystems.
What is a common refractory material?
A common refractory material is alumina, which is an oxide of aluminum. Alumina has high temperature resistance and is commonly used in industrial furnaces and kilns due to its ability to withstand extreme heat.
What are refractory mineral?
Refractory refers to inorganic non-metallic materials that above 1580 ℃ refractoriness. Refractory variety, usually divided according to the level of ordinary refractoriness refractory (1580 ~ 1770 ℃), advanced refractories (1770 ~ 2000 ℃) and grade refractory (2000 ℃ above); divided by the chemical properties of acidic refractories, neutral and basic refractories refractories. In addition, there are special occasions for refractories.
What is a refractory table?
A refractory table has leaves at ends, not in center....Expandable.The correct name is a refectory (dining hall) table. The answer is basically correct for that term. Refractory describes heat resistant and/or insulating materials used in kilns, furnaces, wood stoves, etc (e.g. refractory brick). I suppose you could make a table out of firebrick.
What has the author Edward R Begley written?
Edward R. Begley has written: 'Guide to refractory and glass reactions' -- subject(s): Chemistry, Defects, Glass, Glass manufacture, Refractory materials
How do you calculate refractory wear index in electric arc furnace?
The refractory wear index in an electric arc furnace (EAF) is calculated by measuring the thickness loss of the refractory lining over a specific time period. This involves taking initial and final measurements of the refractory lining's thickness and calculating the difference. The wear index can also be expressed as a ratio of the volume of refractory material lost to the total volume of the refractory lining, often normalized by the duration of the operation. This index helps in assessing the performance and longevity of the refractory materials used in the EAF.
What is cold-crushing strength of refractory materials?
cold crushing strength of a refractory brick is gross compressive stress required to cause fracture. Maximum Structural load that a material can withstand without fracture
What is cold crushing strength of refractory materials?
cold crushing strength of a refractory brick is gross compressive stress required to cause fracture. Maximum Structural load that a material can withstand without fracture
