What is a blast furnace GCSE?

The blast furnace Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as haematite contain iron(III) oxide, Fe 2O 3. The oxygen must be removed from the iron(III) oxide in order to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.

How is a blast furnace used to extract iron?

A blast furnace is a gigantic, steel stack lined with refractory brick where the concentrated iron ore, coke, and limestone are dumped from the top, and a blast of hot air is blown into the bottom. All the three ingredients are crushed into small round pieces and mixed and put on a hopper which controls the input.

What is the role of CaCO3 during the manufacture of iron from its ores in blast furnace process?

Limestone removes impurities present in the iron ore. This is achieved because, at high temperatures, calcium carbonate will undergo thermal decomposition to calcium oxide. The calcium oxide then reacts with the acidic impurities (mainly silica) present in the iron ore to form molten slag (calcium silicate).

What is an ore GCSE Chemistry AQA?

An ore is a rock that contains enough of a metal or a metal compound to make extracting the metal worthwhile.

What is the process of blast furnace?

blast furnace, a vertical shaft furnace that produces liquid metals by the reaction of a flow of air introduced under pressure into the bottom of the furnace with a mixture of metallic ore, coke, and flux fed into the top.

Why limestone is used in blast furnace?

Limestone is also used to remove impurities from the blast furnace when making iron. The impurities are mostly silicon dioxide (also known as sand). The calcium carbonate in the limestone reacts with the silicon dioxide to form calcium silicate (also known as slag).

What is a salt GCSE chemistry?

A salt is a compound formed when some or all the hydrogen ions in an acid are replaced by metal ions or ammonium ions. For example, zinc sulfate is the salt formed when zinc ions replace the hydrogen ions of sulfuric acid.

What is a blast furnace in chemistry?

What are the chemical reactions in a blast furnace?

The reactions of the blast furnace involve 1) combustion of the fuel and its conversion into carbon monoxide, 2) reduction of the ore, and 3) formation of slag. A reaction such as FeO + CO = Fe + CO2 can occur in both the forward and backward direction under conditions existing somewhere in the blast furnace.

Why is called blast 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”.

Why is coke used in blast furnace?

In the blast furnace route of ironmaking, metallurgical coke are used for four main purposes: first to act as a reducing agent, second to fulfil the energy demand of the endothermic reduction reactions, third to maintain the structure and permeability inside the furnace and fourth to act as a carburiser for freshly …

What is smelting using blast furnace?

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.

What are the 4 methods of salt making?

Salt Production and Processing

• Solar Evaporation Method. This is the oldest method of salt production.
• Rock Salt Mining Method. Morton also uses the second oldest method of producing salt – underground mining.
• Vacuum Evaporation Method.