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The method. Three substances are needed to enable to extraction of iron from its ore. The combined mixture is called the charge:. Iron ore, haematite often contains sand with iron oxide, Fe 2 O 3.. 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.
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 decomposition of limestone (CaCO3). this result into the formation of calcium silicate (CaSiO3) or slag which is a liquid. slag flows to the the bottom of the furnace where it floats on
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, 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...
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
#0183;#32;The fuel contains a mixture of flux that is particularly limestone where iron ore is available, and coke is supplied and pumped through the top of the furnace. On the other hand, the bottom of the furnace is attached with a series of parallel pipes that transfer hot blast
Blast furnace operation In the blast furnace burden (consists of iron ore sinter/pellets +coke +limestone/lime) at 298K is charged from top. During its descent, there occurs heat and mass exchange with the hot gases which are moving up. Hot gases comprise of CO,CO 6 and N 6. Thus blast furnace is a counter current heat and mass
limestone is charged in blast furnace. How A Blast Furnace Workstwinkletwinklelittlestar. Apr 28 2014 #183; How A Blast Furnace Works The purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called quot;hot metalquot;.
In the blast furnace production, iron ore, coke, and slagforming 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.
The limestone charged in the blast furnace must be in lumps (2560 mm across), firm, not prone to fines and most important, free from harmful sulphur, phosphorus and silica. 5. UTILIZABLE WASTE: Creating Iron HowStuffWorks.
The limestone descends in the blast furnace and remains a solid while going through its first reaction as followsThis gas has a considerable energy value so it is burned as a fuel in the quot;hot blast stovesquot; which are used to preheat the air entering the blast furnace to become quot;hot blastquot;.
What is the purpose of limestone in a blast furnace? Quora
The fuel contains a mixture of flux that is particularly limestone where iron ore is available, and coke is supplied and pumped through the top of the furnace. On the other hand, the bottom of the furnace is attached with a series of parallel pipes that transfer hot blast air which is enriched with oxygen.
The blast furnace is a complex high temperature counter current reactor and is in the shape of a shaft in which iron bearing materials (ore, sinter/pellet) and coke are alternately charged at the top along with flux materials (limestone, dolomite etc.) to create a layered burden in the furnace.
Coke is an important raw material in the smelting process of the blast furnace, accounting for about 45%. Others include pellets, sinter, lump ore, limestone and so on. Regarding coke, some people may have doubts. Coke and coal are all highheating fuels.
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 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.
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 quot;hot metalquot;. 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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