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limestone consumption in blast furnace

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

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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limestone consumption in blast furnace

limestone consumption in blast furnace Lecture 29: Exercises in materials Balance in iron making nptel In a furnace, iron ore is reduced according to the following reaction: Fe O. 6CO c) Consumption of coke per day when C of coke is 88%. carbon in coke per Limestone charge. 00kg moles.

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limestone consumption in blast furnace

Lecture 26: Iron making in blast furnace Contents Preamble nptel. Blast furnace iron making is an example in which both unit processes that is In the blast furnace burden (consists of iron ore sinter/pellets +coke +limestone/lime) at 298K is Coke consumption varies from 500 550 kg/ton of hot metal. Read more

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Blast furnace metallurgy Britannica

Blast furnaces produce pig iron from iron ore by the reducing action of carbon (supplied as coke) at a high temperature in the presence of a fluxing agent such as limestone.Ironmaking blast furnaces consist of several zones: a crucible-shaped hearth at the bottom of the furnace; an intermediate zone called a bosh between the hearth and the stack; a vertical shaft (the stack) that extends from

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INTER-INFLUENCING FACTORS IN AFFECTING BF COKE RATE

A blast furnace (BF) is a multivariate system which is subjected to a large number of limestone consumption. However, analysis shows the variable, ash content in coke affected the coke rate, though marginally when the inter-influence was isolated. The range studied against this

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How Does a Blast Furnace Work? hanrm

In the blast furnace production, iron ore, coke, and slag-forming flux (limestone) are charged from the top of the furnace, and preheated air is blown from the tuyere located at the lower portion of the furnace along the circumference of the furnace.

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Environmental impact analysis of blast furnace slag

May 01, 2016· Sensitivity analysis showed that the environmental impact of slag-based cement was sensitive to the consumption of limestone and energy, as well as allocation methods and life cycle impact assessment model, while was insensitive to the consumption amount and transport distance of blast furnace slag.

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(PDF) Stabilizing the composition of blast-furnace

Accordingly, the rational method of introducing limestone in the charging bunker is determined in industrial tests.At blast furnace 5, samples of hot metal and slag are taken at 10-min intervals, with different methods of introducing the limestone in the bunker: at the bottom, in the middle, and at the top.

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(PDF) The analysis of the effect of iron-ore raw material

It shows that with a higher portion of non-fluxed pellets (up to 60%) in the charged burden it is necessary to charge limestone in the furnace to achieve the required basicity of blast-furnace slag.

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Limestone Its Processing and Application in Iron and

Jul 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

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How Does a Blast Furnace Work? hanrm

In the blast furnace production, iron ore, coke, and slag-forming flux (limestone) are charged from the top of the furnace, and preheated air is blown from the tuyere located at the lower portion of the furnace along the circumference of the furnace.

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Physical Properties of Crushed Air-cooled Blast Furnace

blast-furnace slag that solidified by slow cooling under atmospheric condition. SCR with 5-20 mm and 20-40 mm gradation were provided by Panzhihua Huanye Metallurgical Slag Exploiting Co., Ltd. Crushed limestone (LCR) is a coarse aggregate resulting from industrial crushing of limestone

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Blast furnace metallurgy Britannica

Blast furnaces produce pig iron from iron ore by the reducing action of carbon (supplied as coke) at a high temperature in the presence of a fluxing agent such as limestone.Ironmaking blast furnaces consist of several zones: a crucible-shaped hearth at the bottom of the furnace; an intermediate zone called a bosh between the hearth and the stack; a vertical shaft (the stack) that extends from

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MAXIMIZING LOW FE HYGROSCOPIC IRON ORE

BLAST FURNACE OPERATION AT A GLANCE 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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The Carbon Cost of Slag Production in the Blast Furnace: A

The quality of raw materials (iron ore, coal, and coke) has a clear impact on the carbon emissions of the hot metal production in steel making. So far, very little work has been done to measure and quantify this impact. Yet for benchmarking, technology choice and general carbon optimization are important elements. The total slag production of a blast furnace gives an accurate and relevant

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Production and Development of Large Blast Furnaces from

Blast parameters affect the thermal state and the energy consumption of blast furnace. The average blast volume of one ton hot metal, oxygen enrichment rate, blast temperature and the top gas temperature were 1039.14 m 3, 3.56%, 1212.27°C and 176.11°C, respectively . The oxygen enrichment rate of Sha Steel (No. 8) reached about 10%, which was

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what is the role of limestone in extraction of iron??

Iron is extracted from its ore, haematite, in a blast furnace. The ore is fed into the top of the furnace along with coke and limestone. The limestone decomposes in the hot furnace, forming calcium oxide. This reacts with the sandy impurities (silicon dioxide) to form a slag.

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Uses of limestone Limestone [GCSE Chemistry only] GCSE

Limestone which is a sedimentary rock is a valuable resource from the Earth’s crust. It has many uses. Limestone is also used to remove impurities from the blast furnace when making iron

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Extraction of Iron in the blast furnace using raw

Extraction of iron in the blast furnace using; coke (carbon), limestone (calcium carbonate), haematite (iron III oxide)

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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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