Which refractory used in the furnace roof of reheating furnace?
High Alumina Refractory Bricks, Chamotte Refractory Brick, Insulation Refractory Brick, Insulation Castable, Refractory Castable and Refractory Gunning Mortar are main refractory materials for reheating furnaces, and we supply all kind of refractories according to customer requirements.
What is the purpose of the refractory brick lining on the furnace?
One particular refractory product to consider is the refractory lining, which is a protective layer inside the kiln or furnace that acts as a form of insulation to withstand high temperatures. It can also protect the structure from thermal shocks, abrasion and chemical attack.
What requirements must furnace refractories fulfill?
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.
Which refractory is used in blast furnace?
Carbon and graphite refractories are primarily used for blast furnace linings because of their high temperature conductivity and their ability to reduce the heat load by moving the excessive heat to the shell where the heat can be transferred to the water by film cooling or through the cast iron or copper staves.
What are the general requirements of a refractory material?
The general requirements form the refractories are (i) ability to withstand high temperatures and trap heat within a limited area like a furnace, (ii) ability to withstand sudden changes of temperature, (iii) ability to withstand load at service conditions, (iv) ability to withstand chemical and abrasive action of the …
What is the thickness of refractory lining in BOF?
This consist of a thinner safety lining to protect the shell usually of thickness ranging from 150 mm to 225 mm and a thicker working lining usually of thickness ranging from 450 mm to 750 mm.
Which of the properties is not associated with refractory materials?
Which of the following properties is not associated with refractory metals? Explanation: Refractories are heat resistant materials capable of withstanding high temperatures of up to 2150oC. They have developed good heat, corrosion, and abrasion resistance. They also possess a high fusion temperature.
What are refractory bricks made of?
For domestic uses, such as ovens, barbecue grills and fireplaces, the refractory bricks used are usually composed of clay containing mainly alumina and silica, elements capable of withstanding high temperatures. While alumina has reflective qualities, silica is an excellent insulator.
Which bricks are used in the lining of blast furnace?
Blast furnace is the main equipment for ironmaking, and clay brick is the earliest furnace lining material used in blast furnace.
Which property is most important for an insulating brick?
The thermal conductivity (l) is significant for efficient operation, therefore bricks with low l-values are preferred. The basic rule is ‘The lower the bulk density, the lower the thermal conductivity’.
Why basic refractories are used in steel making LD converter?
This is why slag former lime is added and it maintains the basicity of the slag (CaO/SiO2>1). However due to the addition of lime, the converter must be lined with basic refractory bricks. Otherwise it will be corroded at a high rate. This is why the process is called basic oxygen steelmaking.
Which property is the most important for an insulating brick Mcq?
Refractoriness under load (RUL) is the most important property for the refractory bricks.