What is desulphurization in steel making?
The principle of desulphurization is to transfer the sulfur dissolved in the liquid steel to a CaO-rich slag phase. This process is typically carried out in a ladle furnace (LF). For this process to be successful, two conditions need to be fulfilled: The slag must be fully liquid (liquid fraction > 0.9).
What is desulphurization and how it is done?
Desulfurization refers to the industrial process of removing sulfur from a mineral resource mixture such as crude oil. It predominantly involves a gas-purification industrial procedure used to remove hydrogen sulfide (H2S) and carbon dioxide (CO2) from a given mineral resource.
Which metal is used for desulphurization?
Magnesium enables fast desulphurization while lime allows for low final sulphur concentrations. In the past, the lime was sometimes replaced by calcium carbide, which is more efficient, but due to safety issues this option is hardly used in steel plants anymore.
How do you do desulphurization?
Desulphurisation of metal can be controlled by adding reagents (via injection or mixing), such as lime, calcium carbide and magnesium. Lime is the most applied reagent, which can be used in every desulphurisation process from the BF to SM.
What is desulphurization of coal?
The process of removing sulfur from coal is termed as desulfurization and can be achieved by various physical, chemical, and biological methods.
Why is Dephosphorization important?
Dephosphorization of steels has become a very important metallurgical technique in steelmaking process to produce high quality steels. As the P content is controlled by the reactions in BOF, the double slag technique has generally been applied to obtain low P killed steels.
What is the importance of desulphurization?
These processes are of great industrial and environmental importance as they provide the bulk of sulfur used in industry (Claus process and Contact process), sulfur-free compounds that could otherwise not be used in a great number of catalytic processes, and also reduce the release of harmful sulfur compounds into the …
What is desulphurization index?
Desulphurization potential – Desulphurization potential is also a function of the slag composition. To characterize the slag behaviour a lime saturation index defined by the ratio of the actual CaO (calcium oxide) content to the CaO content for lime saturated slags is generally used.
How do you remove sulphur from iron?
By applying microwave and chemical methods (H2SO4/H2O2) together, sulfur content of iron ore was removed approximately by 84%.
Why desulphurization of coal is needed?
Most of research work on coal desulfurization has been focused on pyritic sulfur removal, which represents in most cases at least half of the total sulfur content in coal, since organic sulfur is more difficult to be removed by conventional processes. Desulfurization aims mainly at breaking down the pyrite lattice.
What is Dephosphorization process?
The dephosphorization processes (reduction in the phosphorus content) of pig iron consist in oxidizing the phosphorus and combining it with calcium and other components, which are injected into the hot metal deeply, resulting in compounds which are transferred to the slag and, thus, removed from the metal.
How is desulphurization of steel done?
Desulphurization is usually performed by transferring sulfur (S) that is dissolved in the liquid metal to a CaO-rich slag phase, as shown in the image: The principle of desulphurization is to transfer the sulfur dissolved in the liquid steel to a CaO-rich slag phase. This process is typically carried out in a ladle furnace (LF).
What is the principle of desulphurization?
The principle of desulphurization is to transfer the sulfur dissolved in the liquid steel to a CaO-rich slag phase. This process is typically carried out in a ladle furnace (LF). For this process to be successful, two conditions need to be fulfilled:
What is desulfurization of steel by slags?
Desulfurization of steel by slags The most popular method of desulfurization is removal of sulfur from molten steel to the basic reducing slag. Basic slagis a slag containing mainly basic oxides: CaO, MgO, MnO, FeO. A typical basic slag consists of 35-60% CaO + MgO, 10-25% FeO, 15-30% SiO2, 5-20% MnO.
What is the most popular desulphurizing process today?
The most popular desulphurizing process today is deep injection of desulphurizing agent in the hot metal. Desulphurization process. Dip lance process is the most economical, effective and reliable method of desulphurization hot metal.