• ### How it works: The Blast Furnace

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.

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

May 08, 2013· Also important is the consistency of chemical composition and size fraction. Further limestone used for calcination should have good decrepitation index. Iron and steel making. Basically limestone is used as a slag former. Dolomite is used as a slag former, slag modifier and as a …

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• ### Metal extraction - MYP Chem

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 …

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• ### Metallurgical Calculations: Calculation of the Charge of ...

dominating constituents of all blast furnace slags, the reason being' that silica is the principal material to be fluxed, and that lime (from limestone) is the cheapest material which will flux it, alíd form a fusible slag. Analyses of numerous blast furnace slags show the following variations of composition . Si02 25 to 65 Per Cent. FeO CaS

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• ### 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.

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• ### Blast Furnace Slag - Material Description - User ...

(2) The production of expanded blast furnace slag is no longer favored and is being replaced by the pelletizing procedure. ACBFS has been used as an aggregate in Portland cement concrete, asphalt concrete, concrete, asphalt and road bases. Pelletized blast furnace slag has been used as lightweight aggregate and for cement manufacture.

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Oct 31, 2012· In this video, you will learn all about blast furnace and its uses. Watch the whole video and get to know everything about it! If you like this video then please share this with your friends!

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• ### GCSE CHEMISTRY: The Blast Furnace Flashcards | Quizlet

What are the raw materials used in the Blast furnace? Haematite (iron ore), Coke (impure carbon), limestone (calcium carbonate) Write the equation of the first reaction.

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• ### limestone-mining | Bharat Mining

Limestone is used as a flux in the blast furnace. The limestone is added to the iron ore burden of the blast furnace in the amount of ~117kg per tonne of “hot metal” (steelmaker’s slang for the liquid iron produced by the blast furnace).

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

Aug 04, 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.

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• ### Blast furnace | metallurgy | Britannica.com

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 ...

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• ### On the use of caustic lime, instead of limestone, in blast ...

The Ougree Company, now thlly convinced of the immense advantages derivable from the use of lime, is occupied with the construction of kilns heated by the blast furnace gases. Liege, December 21. 0~ the Use of Caustic Lime, instead of Limestone, in Blast Fgrnaces.

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• ### GCSE CHEMISTRY - Extraction of Iron in the Blast Furnace ...

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 …

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• ### Blast furnace - Wikipedia

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. Blast refers to the combustion air being "forced" or supplied above atmospheric pressure.. In a blast furnace, fuel (), ores, and flux are continuously supplied through the top of the furnace, while a hot blast of air (sometimes with ...

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• ### blast furnace Flashcards and Study Sets | Quizlet

Learn blast furnace with free interactive flashcards. Choose from 252 different sets of blast furnace flashcards on Quizlet.

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• ### Why is limestone used in steelmaking - Answers

Limestone is used as a flux to assist the removal of impurities in the steel such as sulphur, phosporous etc. Mostly, limestone is converted (calicined) to burnt lime first in a kiln before being ...

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• ### 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).

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

The first thing required is a blast furnace, which is filled with iron ore, coke, and crushed limestone. Then it is fired and a strong air blast is blown upwards through the furnace. ...

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• ### limestone used in blast furnace

limestone processing blast furnace - crusherasia. This page is provide professional limestone used in blast furnace information for you, , Used in blast furnaces, limestone extracts iron from its ore. Limestone and dolomite flux and their use in iron and ,

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

Nov 13, 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...

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• ### METALLURGICAL USES FLUXES FOR METALLURGY

pellets, and sinter in blast furnaces with subsequent refining of molten iron and scrap in oxygen-blown processes. The electric furnace is used to make steel, stainless steels, ferroalloys, and special alloys, whereas ferromanganese is often made in blast fur- naces. Fluxes are used in all of these processes, and either limestone

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• ### 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".

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• ### How to Make Cement From Blast-Furnace Slag

Table of ContentsGranulating SlagSlag CementPortland Cement made from Slag and LimestoneIron Portland CementSpecial CementsSlag BricksDiscussion The successful establishment of iron blast-furnace plants at Newcastle and Lithgow naturally invites attention to the economic utilization of the various products and by-products arising out of the industry.

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• ### 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 ...

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• ### 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.

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• ### Hydration of quaternary Portland cement blends containing ...

In this study the hydration of quaternary Portland cements containing blast-furnace slag, type V fly ash and limestone and the relationship between the types and contents of supplementary cementitious materials and the hydrate assemblage were investigated at ages of up to 182 days using X-ray diffraction and thermogravimetric analysis.

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• ### 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. ... Most of the molten iron from a Blast Furnace is used to make ...

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• ### 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 …

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• ### Why is calcium carbonate added to the blast furnace ...

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.

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• ### Limestone - Wikipedia

Used in blast furnaces, limestone binds with silica and other impurities to remove them from the iron. It is used in sculptures because of its suitability for carving. Occupational safety and health. People can be exposed to limestone in the workplace by inhalation of and eye contact with the dust.

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

Sep 16, 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.

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• ### Ironmaking 101 – From Ore to Iron with Blast Furnaces ...

Oct 10, 2017· Iron is made by reacting iron ore (iron oxide and impurities), coke (a reductant) and limestone (CaCO 3) in a blast furnace. A specialized type of coal, called hard coal, is used to make coke, a porous form of carbon. Coke is a reductant or a chemical that …

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

May 08, 2013· Also important is the consistency of chemical composition and size fraction. Further limestone used for calcination should have good decrepitation index. Iron and steel making. Basically limestone is used as a slag former. Dolomite is used as a slag former, slag modifier and as …

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