What refractory is used for ladle lining?
What refractory is used for ladle lining?
The refractory materials normally used for lining are dolomite bricks, magnesia chrome bricks, magnesia carbon bricks, high alumina bricks, aluminum carbon bricks, and high alumina castable.
Which refractory is used in stack lining of blast furnace?
Different types of refractories which are used in blast furnace lining are described below….Refractory lining of blast furnace.
| Tab 2 Blast furnace refractories | ||
|---|---|---|
| Area | Present | Trend |
| Stack | 39 % – 42 %% Al2O3 | Super duty fireclay |
| Belly | 39 % – 42 % Al2O3 | Corundum, SiC-Si3N4 |
| Bosh | 62 % Al2O3, Mullite | SiC-Si3N4 |
Which refractory material is used in hearth of blast furnace?
The main refractory lining of blast furnace hearth is composed by carbon blocks that operates in continuous contact with hot gases, liquid slag and hot metal, in temperatures above 1550 ºC for 24 hours a day.
Why is the inside of a blast furnace lined with fire bricks?
The inside of a blast furnace is extremely hot (up to 1500 ºC in places). The inside surfaces have to withstand these extremely high temperatures without cracking. The inside is lined with firebricks made from special refractory materials. Therefore the furnaces are well insulated.
What is ladle lining?
These are clay graphite products used for replacing the transfer ladle and holding ladle refractory lining. They have non-wetting property which provides longer lining life. They are available with baffle plates.
What refractories are used in steelmaking?
Fireclay and high alumina refractories are used. Most of the continuous furnaces are lined with fireclay bricks. Plastic chrome ore ramming mixture and hard burnt chrome magnesite bricks are used to line the hearth to provide resistance to scale.
What is refractory in blast furnace?
Blast furnaces are like regular furnaces lined with refractory to withstand the high temperatures and the abrasive materials being processed. The refractory lining’s properties are enhanced through cooling to protect the refractory lining from excess heat.
What are blast furnaces lined with?
The purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called “hot metal”. The blast furnace is a huge, steel stack lined with refractory brick, where iron ore, coke and limestone are dumped into the top, and preheated air is blown into the bottom.
Why graphite is used in blast furnace?
The blast furnace method and the electric arc furnace method. The electric arc furnace method recycles used iron scrap by melting it in an electric arc furnace. It is the graphite electrodes inside the furnace that actually melt the iron. Graphite has high thermal conductivity and is very resistant to heat and impact.
What is a refractory liner?
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.
Where and how are refractory bricks used in different types of furnaces?
Refractory bricks (fire brick): A fire brick, firebrick, or refractory is a block of ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency.
What is the temperature of hot blast stove?
Blast furnaces fed with air that has been preheated to temperatures from 900 to 1,250 °C (1,650 to 2,300 °F) can generate smelting temperatures of about 1,650 °C (3,000 °F), significantly reducing the consumption of coke per ton of iron produced.
