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 the shape of blast furnace?
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 special about a blast furnace?
They smelt ore blocks, tools and armour , just like regular furnaces. But they work twice as fast as regular furnaces do! They'll chew through a pile of iron or gold ore like there's no tomorrow, yielding a shiny stack of ingots.
Why is it 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 are the main parts of a blast furnace?
The components of a blast furnace include the Charge, exhaust gas outlet, charging bells, gas outlet, tuyeres, taphole, bustle pipe, slag hole, refractory lining, and conveyor system .
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 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.
Who invented blast furnace?
Hot blast was patented by James Beaumont Neilson at Wilsontown Ironworks in Scotland in 1828. Within a few years of the introduction, hot blast was developed to the point where fuel consumption was cut by one-third using coke or two-thirds using coal, while furnace capacity was also significantly increased.
Which fuel is best suitable for blast furnace process?
Which fuel is best suitable for blast furnace process? Explanation: Coke is best suitable for blast furnace process as it also acts as a reducing agent in smelting iron ore.
Which is closest to the purest form of the iron?
> The purest form of iron is Wrought iron . It is an alloy of iron with very low carbon content when compared with cast iron. It is a semi-fused mass of iron which has fibrous slag inclusions. Wrought iron is tough, malleable, ductile and can be easily welded.
How often is the blast furnace tapped?
Every two hours the blast furnace is tapped: a tap hole is bored by means of a large drill. Out of it flow both the slag and the glowing yellow molten pig iron at approximately 1500 °C. When the outflow changes to slag only, the hole is closed up again by use of a mudgun.
What are the advantages and disadvantages of blast furnace?
- Continuous feeding, continuous tapping, suitable for large-scale continuous production;
- Low power requirements;
- The product is further processed (continuous casting and rolling) with good performance.
- Mature technology and low production cost.
- High efficiency.
How does a blast furnace work?
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 is called the lower part of the furnace?
In the lower part of the blast furnace, the temperature is as high as 2200 K. It is called combustion zone . At the top, the temperature is as low as 500−800 K. It is called reduction zone. In the lower temperature range, carbon is the reducing agent and in the higher temperature range, CO is the reducing agent.
