What is the function of slag in blast furnace?
What is the function of slag in blast furnace?
Pelletized blast furnace slag has been used as lightweight aggregate and for cement manufacture. Foamed slag has been used as a lightweight aggregate for Portland cement concrete. Granulated blast furnace slag has been used as a raw material for cement production and as an aggregate and insulating material.
What are the inputs of the blast furnace?
2.1 Blast Furnace Production Other inputs include coke to produce carbon monoxide for the reduction of iron ore to iron, and other energy sources for various stages of the production process, such as preheating of air up to 1100°C for injection into blast furnaces.
What three chemicals do we input into the blast furnace?
Blast furnace, a vertical shaft furnace that produces liquid metals by the reaction of a flow of air introduced under pressure into the bottom of the furnace with a mixture of metallic ore, coke, and flux fed into the top.
Why coke is used in blast furnace?
Coal Carbonization Metallurgical coke, along with iron ore and limestone, is layered into a blast furnace to convert the iron ore to metallic iron. Coke, which is mostly carbon, reacts with the blast air to produce carbon monoxide, which, in turn, reacts with the iron oxide to produce carbon dioxide and metallic iron.
How is slag removed from the furnace?
10.2. Blast furnace slag (BFS) is a by-product from iron production in blast furnaces, which are fed by a mixture of iron-ore, coke and limestone. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled.
Why the zinc produced inside the furnace is a gas?
Under the conditions in the furnace zinc is a vapour (gas), whereas lead is produced as a liquid by a similar series of reactions. The zinc vapour is carried into the condenser in a stream of carbon monoxide and carbon dioxide gases (at about 1300 K) and condensed by adsorption in a spray of liquid lead.
Which is closest to the purest form of the iron?
Wrought iron
> The purest form of iron is Wrought iron.
What is the difference between blast furnace and reverberatory furnace?
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. In contrast, air furnaces (such as reverberatory furnaces) are naturally aspirated, usually by the convection of hot gases in a chimney flue.
Which is a better fuel coal or coke?
Coke is a better fuel than coal because; -Coke produces more heat on burning than coal. -Coke has a higher calorific value than coal. When equal masses of coke and coal are burnt, coke produces more heat.
Is slag a waste?
Piles of steel slag, a solid waste generated from the iron and steel industry, could be seen due to no utility found for the past century. The chemical composition of steel slag varies as the mineral composition of raw material such as iron ore and limestone varies.
Why is slag used in an electric arc furnace?
Slag foaming in electric arc furnace (EAF) steelmaking is critical for high productivity. The slag foam protects the refractories from the high intensity arc allowing for high power input and productivity. In the slag foaming process, carbon is injected into the slag, reacts with FeO in the slag producing CO, which foams the slag.
Why is slag used in electric matte smelting?
In electric matte smelting furnaces the efficiency of operation is also dependent on the soundness of the electrical side of the furnace as well as on the design of the furnace as a reactor to promote the separation and settling of the matte through the slag, as mentioned above.
Where does slag come from in a steel mill?
Slag run-off from one of the open hearth furnaces of a steel mill, Republic Steel, Youngstown, Ohio, November 1941. Slag is drawn off the furnace just before the molten steel is poured into ladles for ingotting.
How is heat generated in Cu-Ni matte smelting?
Thus in Cu-Ni matte smelting, the heat is generated by the electrical resistivity of the slag. Then the resistivity of the slag largely determines the rate of production, efficiency of smelting and also the dimensions of the furnace for a desired rate of production.
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