Why is limestone 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 the function of limestone and coke in blast furnace?
The coke is a source of carbon monoxide which will reduce the iron oxide in the ore to iron and the carbon monoxide oxidizes to carbon dioxide. The limestone acts as a flux to remove other impurities and help the iron physically separate from the rest of the burden.
What is the role of limestone in iron extraction?
In the extraction of iron, a basic flux limestone is used. Limestone decomposes to form CaO which reacts with silica gangue present in the iron ore is acidic in nature to form calcium silicate (slag).
What is limestone used for in iron and steelmaking?
The main uses of limestone in iron and steel industry are (i) as a fluxing material, and (ii) other usage which consists of desulphurizing agent, coating of moulds of pig casting machine, neutralizing of acidic water, water treatment, waste water(effluent) treatment, flue gas treatment, and sludge and sewage treatment.
What is the purpose of limestone?
Limestone has numerous uses: as a building material, an essential component of concrete (Portland cement), as aggregate for the base of roads, as white pigment or filler in products such as toothpaste or paints, as a chemical feedstock for the production of lime, as a soil conditioner, and as a popular decorative …
Why is limestone added to steel?
Limestone and lime are used to make iron ore pellets. An alternative raw material for the blast furnace is iron ore sinter. Limestone and lime added to the sinter react with impurities and balance the slag composition of pig iron production.
Is limestone used in steel?
In iron and steel Industry, limestone and dolomite are used both in ironmaking and steelmaking. Limestone and lime products are used as fluxing material both in ironmaking and in steelmaking. Further lime from limestone reacts with the S present in the raw materials to form calcium sulphide (CaS) which goes into slag.
What are characteristics of limestone?
Limestone is usually gray, but it may also be white, yellow or brown. It is a soft rock and is easily scratched. It will effervesce readily in any common acid.
Is limestone used in toothpaste?
Calcium carbonate is good for strong, healthy teeth. Many toothpaste manufacturers use limestone in their toothpaste. Most toothpaste includes abrasives, binders, foaming agents, detergents, including limestone. Toothpaste companies also use limestone in their toothpaste to give it its white color.
Is it safe to eat limestone?
“Slaked lime is also known as calcium hydroxide and limestone is known as calcium carbonate; and calcium is very important for the body. But that doesn’t mean you just directly eat calcium carbonate or lime. This could be harmful for health, and could even cause fatal diseases in some cases.”
What is limestone used to build?
Limestone is a rock with a variety of uses. Most limestone is crushed and used as a construction material. Other uses include: road base, railroad ballast, concrete and cement when it’s fired in a kiln with crushed shale.
Is limestone expensive to build with?
Is limestone expensive? Limestone is readily available and relatively easy to cut into blocks or more elaborate carving. It is also long-lasting and stands up well to exposure. However, it is a very heavy material, making it impractical for tall buildings; it is also quite expensive.
Is limestone bad for building?
Limestone is another natural stone which is commonly used for decorative purposes. This stone has a soft structure, which makes it really sensitive against scratches. The acidic substances, harsh cleaning agents, sharp edges and tools can easily damage the limestone made materials.
Does limestone break easily?
Limestone is often used as a building material, though is not as strong as some other rocks, such as sandstone. With the proper tools and application, it is possible to break up large chunks of limestone.
Is it okay to build a house on Limestone?
Limestone has been used to help construct some of the most well known buildings in the world. It is one of the oldest, most versatile building materials available, and working with expert craftsmen can leave you with absolutely stunning additions.
Why is limestone bad?
Inhalation: Limestone dust: May cause respiratory tract irritation. Adverse symptoms may include respiratory tract irritation and coughing. Prolonged or repeated inhalation of respirable crystalline silica liberated from this product can cause silicosis, a fibrosis (scarring) of the lungs, and may cause cancer.
Can limestone cause cancer?
CARCINOGENICITY: Crushed limestone is not listed by the National Toxicology Program (NTP), or the International Agency for Research on Cancer (IARC) as a carcinogen. However, respirable crystalline silica, a trace element in this product, is listed as a Group 1 carcinogen (carcinogenic to humans) by the IARC.