Question

what are the raw materials used in iron and steel industry?​

Answer 1

Answer:

The main raw materials for iron and steel industry are iron ore, manganese; scrap iron, flux and fuel. It also requires refractoriness for the con­struction of furnaces and ferroalloys for deoxidation.

Explanation:

Answer 2

Answer:

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The ores used in making iron and steel are iron oxides, which are compounds of iron and oxygen. The major iron oxide ores are hematite, which is the most plentiful, limonite, also called brown ore, taconite, and magnetite, a black ore. Magnetite is named for its magnetic property and has the highest iron content. Taconite, named for the Taconic Mountains in the northeastern United States, is a low-grade, but important ore, which contains both magnetite and hematite.

Ironmaking furnaces require at least a 50% iron content ore for efficient operation. Also, the cost of shipping iron ores from the mine to the smelter can be greatly reduced if the unwanted rock and other impurities can be removed prior to shipment. This requires that the ores undergo several processes called "beneficiation." These processes include crushing, screening, tumbling, floatation, and magnetic separation. The refined ore is enriched to over 60% iron by these processes and is often formed into pellets before shipping. Taconite ore powder, after beneficiation, is mixed with coal dust and a binder and rolled into small balls in a drum pelletizer where it is then baked to hardness. About two tons of unwanted material is removed for each ton of taconite pellets shipped.

The three raw materials used in making pig iron (which is the raw material needed to make steel) are the processed iron ore, coke (residue left after heating coal in the absence of air, generally containing up to 90% carbon) and limestone (CaCO3) or burnt lime (CaO), which are added to the blast furnace at intervals, making the process continuous. The limestone or burnt lime is used as a fluxing material that forms a slag on top of the liquid metal. This has an oxidizing effect on the liquid metal underneath which helps to remove impurities. Approximately two tons of ore, one ton of coke, and a half ton of limestone are required to produce one ton of iron.

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