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Linear change on reheating means that the size of refractory products is irreversible changed when the refractory products are heated to high temperature. A positive value indicates expansion which is called expansion of linear change on reheating; negative value indicates contraction which is called contraction of linear change on reheating.
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What type of refractory lining use for DRI melting in induction furnace?
SiO2 refractory
What Definition of low cement refractory concrete?
A low cement refractory concrete is termed 'low-cement castable refractory'. It includes castable refractory based on alumina and/or alumino-silicates which contain hydraulic setting cement. The total lime (CaO) content on a calcined basis is between 1 and 2.5 percent. More information is available in ASTM C401.
What is water wall in boiler?
A waterwall in a boiler is any furnace wall that is comprised of refractory and tubes in a water-tube boiler. The tubes are evenly spaced and generally connect to headers which in turn are connected back to the main generating bank of the boiler. They serve a two fold purpose here in that they capture heat that would otherwise escape to the atmosphere and help heat the water in the boiler. And they also help keep the refractory cool (relatively speaking) This prevents spalling of the refractory.
What is refractory cement?
A special compound water based product used in high heat applications such as furnaces, fire places or wood stoves. Available ready mixed in small tubs at most hardware stores.
How can i construct refractory castable?
Construction of Refractory CastableDuring the construction of refractory castable, special attention should be paid on pin welding, asphalt brushing, stirring of castable with water, making and fixing of mould, vibration and ramming of refractory castable, demoulding, sizes' and measuring points' accuracy, etc. Do construction strictly as material manufacturer and boiler works required.1. Installation of Pin and Claw NailsReinstall the pins missing for any reason and the pins in the area of heating surface composite melding junction before hydraulic pressure. Lengthen and reinstall the pins properly in coal mouth, material return mouth and upper inflection point of air duct furnace so that meets the required density of pins. Brush all the pre-buried metal parts and claw nails with asphalt paint (thickness > 1mm) or cover them with combustibles before casting.2. Dosing and Stirring of Castable & WaterThe dosing of refractory castable and water should be done strictly as the instructions of material manufacturer. The water should be clean, such as drinking water, ph 6-8. The mixer should be clean forced action mixer, and clean it for the next time using. Pay attention on the adding order of castable and water and its stirring time, adding water freely and prolonging of stirring time are forbidden. The water and refractory castable should be mixed evenly and stirred till smooth. Carry away the mixed casatble immediately after stirring, the castable poured out from stirring tank is disallowed to be poured into the tank and stirred again. Clean the tank after every construction for the next using, record the amount of water and refractory castable, and the stirring time.3. Checking Before Making TemplateCheck carefully whether the pin, hook nail and strutting part conform to the drawing, whether all the re-welding and is done and firm, whether the temporary metal parts have been cut off. Check whether the metal parts which should be brushed with asphalt paint meet the requirement, whether the casting place is clean, any other unrelated materials are forbidden to appear. For easy demoulding, a thin tier of partition (such as used oil) can be brushed in the mould. There can not be gaps between each two templates to avoid castable leaking out, so that also convenient for mould releasing. The refractory castable should be used up in 30 minutes after stirring, and should be casted to the required thickness in 1 time. Ram the castable till tight. For the too thick parts, cast tier by tier, while casting the upper tier, vibration bar can not touch the lower casted tier.
What is permanent linear change in refractory material?
Permanent Linear Change (PLC) is a factor used to judge the suitability of refractories in ranges of temperature limits. Refractory materials can undergo mineral formation, phase transformation or shrinkage when heated. These processes may result in either volume expansion or reduction.
Why did Yilong Refractory change their name into Changxing Refractory?
Because of Changxing Refractory's largest investment, Yilong Refractory was renamed as Changxing Refractrory.
Will the refractory product quality and services also change as the name of Yilong Refractory changed into Changxing Refractory?
The only change of Yilong Refractory is its name which has changed into Changxing Refractory. Its product quality, pre-sale and after-sale services remain unchanged.
What is the refractory clergy?
They were resistant to any change in the status quo.
Can the rate of change be linear or nonlinear?
Yes, the rate of change can be linear or non-linear.
What is reheating temperature?
Depends what's reheating.
What do you mean by refractory concrete?
refractory Concrete means refractory castable == ==
What is a linear factor?
What is a linear factor What is a linear factor A linear factor is defined as a small change here will effect a small change there by a set value or factor.
How can you tell when a constant mass is reached?
the mass doesn't change to reach it, you keep reheating, cooling and weighing
How do you use refractory in a sentence?
1) The virus was refractory to the medication. 2) The refractory class was unable to get anything done.
Where you can get refractory concrete?
Refractory Engineers Indianapolis Indiana 3172732000
What is mag-dolo refractory?
magnesium-dolomite based refractory
