• ### What is the purpose of limestone in a blast furnace? Quora

13/11/2017· limestone is used to remove impurities in the furnace and the main impurity of the blast furnace is silica (sand and rock) which is silicon dioxide. silicon dioxide is a solid at furnace temperatures so it reacts with calcium oxide from the decomp...

### GCSE CHEMISTRY Extraction of Iron in the Blast Furnace

Extraction of Metals. Extraction of Iron.. Chemistry of the blast furnace ().. Limestone is calcium carbonate (CaCO 3) and it is added to the blast furnace to remove the impurities in the iron ore. Calcium carbonate is decomposed by heat in the furnace to give calcium oxide and carbon dioxide. This is called thermal decomposition (see examples of other carbonates).

### Blast furnace Simple English Wikipedia, the free

Process. Ore, limestone and carbon in the form of coke are put into the top of the blast furnace in layers.At the same time, hot air called "wind" is blown inside the furnace. Special nozzles called "tuyeres" are used to put the air in the furnace. The nozzles are at the bottom of the furnace. This process is called "blasting". It is why it is called a "blast furnace".

### What is the use of limestone in a blast furnace? Yahoo

16/09/2008· The formula is CaO + SiO(2) = CaSiO(3). This is molten at blast furnace temperatures and floats on top of the molten iron. It is then removed and cooled into hardened slag. Thus, the lime from limestone combines with the silica and allows the separation of the iron from the silica impurities.

### Why limestone is used in the blast furnace Answers

Limestone is used mainly in the iron making part of steel production where it is added to the iron ore before entering the blast furnace. The limestone reacts with acidic impurities called slag

### HOW A BLAST FURNACE WORKS Foundry Gate

HOW A BLAST FURNACE WORKS Introduction 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. The

### In a blast furnace why are the coke and limestone needed

A blast furnace in a steel works is a huge structure operated for long periods of time, it is charged with iron ore, coke and limestone and reduces the iron ore into pure iron. A Cupola furnace

### Iron and aluminium Revision 4 GCSE Chemistry (Single

in a huge container called a blast furnace. Iron ores such as haematite contain iron(III) oxide, Fe 2 O 3.The oxygen must be removed from the iron(III) oxide in order to leave the iron behind.

### Strength development of ternary blended cement with

The addition of blast-furnace slag, regardless of composition and replacement level, reduces the permeability and the ionic diffusion of chloride in well-cured concrete . Recently, addition of blast-furnace slag to reduce the damage caused by sulphate attack in concrete containing limestone aggregates has been investigated .

### In a blast furnace why are the coke and limestone needed

A blast furnace in a steel works is a huge structure operated for long periods of time, it is charged with iron ore, coke and limestone and reduces the iron ore into pure iron. A Cupola furnace

### Strength development of ternary blended cement with

The addition of blast-furnace slag, regardless of composition and replacement level, reduces the permeability and the ionic diffusion of chloride in well-cured concrete . Recently, addition of blast-furnace slag to reduce the damage caused by sulphate attack in concrete containing limestone aggregates has been investigated .

### The Blast Furnace S-cool, the revision website

Limestone (calcium carbonate). Coke mainly carbon. The charge is placed a giant chimney called a blast furnace. The blast furnace is around 30 metres high and lined with fireproof bricks. Hot air is blasted through the bottom. Several reactions take place before the iron is finally produced. Oxygen in the air reacts with coke to give carbon

### Limestone Its Processing and Application in Iron and

07/07/2017· Application of limestone and lime in iron and steel plant. During the production of iron by blast furnace (BF) route, limestone is added either in the process of sintering or as a direct feed in the blast furnace. Limestone is normally added during ironmaking for obtaining either neutral or slight basic BF slag. Addition of limestone through

### Blast Furnace operation: HOW A BLAST FURNACE WORKS

04/08/2011· 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.

### How it works: The Blast Furnace

How it works: The Blast Furnace back to 'How the plant works' Introduction 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

### Blast Furnace Official Minecraft Wiki

Blast furnaces are similar to furnaces, but can smelt only ore blocks and tools/armor made of iron, gold or chainmail. Once an item and a fuel are placed into the blast furnace, the block state changes to lit and the item is smelted twice as fast as a regular furnace. Fuel is also used at double the rate of regular furnaces, so the number of items smelted per fuel stays the same.

### Metal extraction mypchem

Limestone; Air; Each of the raw materials is necessary for the production click to see its purpose. The blast furnace. The iron ore, coke and limestone ("charge") is fed into the blast furnace from the top. Once inside the hot furnace the coke reacts with the blast of air (containing oxygen) making carbon monoxide gas. This gas is very

### Corrosionpedia What is a Blast Furnace? Definition

The main purpose of a blast furnace is to convert the iron ores, mined in the form of hematite or magnetite, to pig iron. The blast furnace is in use after the iron ores have been converted into iron-rich pellets, and the coke and limestone prepared in the considerable amounts.

### Redox, extraction of iron and transition metals Revision

Redox reactions are involved in the extraction of metals from their ores, eg extracting iron by reduction within the blast furnace. Transition metals have high melting points and densities, form

### Limestone and dolomite flux and their use in iron and

08/05/2013· Fig 2 Industrial use of limestone. Both limestone and dolomite are extensively used in an iron and steel plant in various processes and their use is explained below. Specification of limestone and dolomite for iron making is less rigid. But for steel making limestone should have very low silica (SiO2) and alumina (Al2O3) since these elements

### Blast Furnace ScienceAid

Blasts furnaces are used for smelting during the production of metals such as iron, lead, zinc, and copper. A blast furnace works by blasting hot air up through the furnace while fuels, limestone, and ore move continuously through the top of the furnace.

### Blast furnace metallurgy Britannica

Basically, the blast furnace is a countercurrent heat and oxygen exchanger in which rising combustion gas loses most of its heat on the The stack is kept full with alternating layers of coke, ore, and limestone admitted at the top during continuous operation. Coke is ignited at the bottom and

09/09/2015· The blast furnace is a huge, steel stack lined with refractory brick. Iron ore, coke and limestone are put into the top, and preheated air is blown into the bottom. extraction of zinc in pure form

13/04/2014· Coke Iron Ore and Limestone is put into the blast furnace. Hot air is pumped from the stoves into the blast furnace, gas is released. Animation of the processes. Slag and iron are produced. Shot

### IRON AND STEEL chemguide

The limestone is added to convert this into slag which melts and runs to the bottom. The heat of the furnace decomposes the limestone to give calcium oxide. This is an endothermic reaction, absorbing heat from the furnace. It is therefore important not to add too much limestone because it would otherwise cool the furnace.

### Creating Iron HowStuffWorks

­The more advanced way to smelt iron is in a blast furnace. A blast furnace is charged with iron ore, charcoal or coke (coke is charcoal made from coal) and limestone (CaCO 3 ­). Huge quantities of air blast in at the bottom of the furnace, and the calcium in the limestone combines with the silicates to

### What is the use of limestone in a blast furnace? Yahoo

16/09/2008· The formula is CaO + SiO(2) = CaSiO(3). This is molten at blast furnace temperatures and floats on top of the molten iron. It is then removed and cooled into hardened slag. Thus, the lime from limestone combines with the silica and allows the separation of the iron from the silica impurities.

### Iron Ore Smelting Process Brighthub Engineering

The ore is loaded into a blast furnace along with measured quantities of coke and limestone. Hot combustion air is supplied to the furnace and some form of fuel used to raise the temperature. The iron is reduced from the ore by carbon in the coke, the limestone aiding slag separation from the molten iron. The slag and molten iron are tapped off from the bottom of the furnace, the slag being

### Ground granulated blast-furnace slag Wikipedia

Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.

### Blast Furnace an overview ScienceDirect Topics

Blast furnace gas is produced during the iron oxide reduction in blast furnace iron making in which iron ore, coke and limestone are heated and melted in a blast furnace and is an indigenous process gas of the steelworks industry (Pugh et al., 2013).

### The Extraction of Iron Chemistry LibreTexts

The heat of the furnace decomposes the limestone to give calcium oxide. $CaCO_3 \rightarrow CaO + CO_2 \tag{5}$ This is an endothermic reaction, absorbing heat from the furnace. It is therefore important not to add too much limestone because it would otherwise cool the furnace. Calcium oxide is a basic oxide and reacts with acidic oxides

### Temperature of a Blast Furnace The Physics Factbook

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.

### Term SchoolScience.co.uk

A furnace in which steel is produced by blowing air through a mixture of scrap steel and molten iron. Blast Furnace: A furnace in which molten iron is produced from iron ore, coke and limestone using a blast of hot air. Electric Arc Furnace: An electrically heated steelmaking furnace, in which steel is made entirely from scrap metal. Flux

### limestone used in blast furnace

Blast_furnace. Bloomeries were also artificially blown using bellows, but the term ' blast furnace' is normally reserved for furnaces where iron (or other metal) are refined from ore.Coke, limestone flux, and iron ore (iron oxide) are charged into the top of the furnace in a precise filling order which helps control gas flow and...

### Blast Furnace and Process Description Chemical

12/07/2019· Blast Furnace and Process Description:- Iron blast furnace is a vertical shaft, which is used to melt the iron ore and to produce hot metal by heat exchange and chemical reaction.The burden charge consisting of iron oxide, flux and coke and it provides through the throat from the top of the furnace.

### Blast furnace Simple English Wikipedia, the free

Ore, limestone and carbon in the form of coke are put into the top of the blast furnace in layers.At the same time, hot air called "wind" is blown inside the furnace. Special nozzles called "tuyeres" are used to put the air in the furnace. The nozzles are at the bottom of the furnace. This process is called "blasting". It is why it is called a "blast furnace".

### Blast furnace : HOW A BLAST FURNACE WORKS:

18/01/2016· 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.

### Blast Furnace Limestone ires-biblioteca.it

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. Blast furnaces are used to produce pig iron from iron ore for subsequent

### Useful Products from Rocks Chemistry GCSE Revision

Cement, Mortar, Concrete, Glass. They are all "to do with limestone" but you nedd to be more specific. Cement: Limestone is mixed with clay, heated strongly and then crushed. Mortar: Sand and cement are mixed together with water.It sets hard. It is usually mortar that holds the bricks together in a wall.