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 the bosh to the top of the furnace; and the furnace top, which contains a mechanism for charging …
What is cohesive zone in blast furnace?
In an iron making blast furnace, the iron bearing particles descend through the furnace, undergoing processes of reduction, softening, melting and dripping on to the hearth, and
at temperatures between the start of softening and complete melting
they form the cohesive zone.
Which zone is the hottest in blast furnace?
The bosh
is the hottest part of the furnace because of its close proximity to the reaction between air and coke. Molten iron accumulates in the hearth, which has a taphole to draw off the molten iron and, higher up, a slag hole to remove the mixture of impurities and flux.
What are the main parts of a blast furnace?
- Hot blast from Cowper stoves.
- Melting zone (bosh)
- Reduction zone of ferrous oxide (barrel)
- Reduction zone of ferric oxide (stack)
- Pre-heating zone (throat)
- Feed of ore, limestone, and coke.
- Exhaust gases.
- Column of ore, coke and limestone.
What are the 4 blast furnaces at steelworks?
In Scunthorpe we have four blast furnaces named after four English queens –
Mary, Bess, Anne and Victoria
. Coke, iron ore, sinter and limestone are fed – or charged – into the top of the furnaces.
What is the hottest furnace on earth?
The current official highest registered air temperature on Earth is 56.7 °C (134.1 °F), recorded on 10 July 1913 at
Furnace Creek Ranch
, in Death Valley in the United States.
What is Deadman zone in blast furnace?
A large area of coke
called ‘deadman' is formed in the low part of ironmaking blast furnace. … As a result, the deadman zone plays a crucial role in modern high productivity blast furnaces. The permeability of the deadman is directly related to the coke size distribution and deadman voidage.
Why it is called blast furnace?
The Blast Furnace is a large steel structure about 30 metres high. … The furnace gets its name
from the method that is used to heat it
. Pre-heated air at about 1000
o
C is blasted into the furnace through nozzles near its base. The largest Blast Furnaces in the UK produce around 60 000 tonnes of iron per week.
What happens inside a blast furnace?
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 hot air that was blown into the bottom of the furnace ascends to the top in 6 to 8 seconds after going through numerous chemical reactions.
Why is coke used in a blast furnace?
Publisher Summary. 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 do you power a blast furnace?
To use the blast furnace you'll need to place the
item and fuel onto the blast furnace to change the state to
‘lit'. The item on the blast furnace will be smelted twice as fast a regular furnace, but fuel used on the blast furnace will also be used at double the rate.
What heats a blast furnace?
At the bottom of the blast furnace,
the hot air of 1200°C
heats the materials and fuels. The hot air with a force of 4.0bar triggers such a force that the materials fly up in the air. Because of the heat, coke chemically dissolves the raw materials.
How steel is made in blast furnace?
To make steel,
iron ore is first mined from the ground
. It is then smelted in blast furnaces where the impurities are removed and carbon is added. … About halfway down, limestone begins to react with impurities in the ore and the coke to form a slag. Ash from the coke is absorbed by the slag.
What is the main function of blast furnace?
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.
