Removal of sulphur from hot metal is called desulphurization of hot metal. Sulphur is a desirable element in steel when good machinability is required from the steel product. ... It forms undesirable sulphides which promotes granular weakness and cracks in steel during solidification.

Why is Dephosphorization important?

Dephosphorization of steels has become a very important metallurgical technique in steelmaking process to produce high quality steels. ... Phosphorus can also be removed during the steel refining process. In fact, over 90 % of the input P in the melt can be removed in the BOF.

What is desulphurization in steel?

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). ... The slag must be fully liquid (liquid fraction > 0.9). This is required for kinetic reasons.

What is the need for desulfurization of crude oil?

Desulfurization is the process of removing sulfur from crude oil (or its fractions). It prevents contamination and also improves the efficiency of petroleum. Desulfurization removes elemental sulfur and its compounds from solids, liquids and gases.

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.

Desulfurization - Sulfurex®BR

38 related questions found

What are the favorable conditions for desulphurization?

High chemical activity of the desulfurization agents (Ca, Mg); High contact area between the steel and slag phases; Stirring providing good kinetic conditions of desulfurization; Presence of basic non-oxidized slag capable to absorb the products of the desulfurization reaction (CaS, MgS).

What is desulphurization of coal?

Some methods have been applied to coal to remove its inorganic materials from the organic part. ... Most of the effective coal desulfurization techniques are based on chemical methods. Main desulfurization methods are chemical desulfurization, leaching, extraction, flotation, oxydesulfuriza- tion and biodesulfurization.

What is oxidative desulfurization?

Abstract. Oxidative desulfurization, in which the aromatic sulfur containing compounds are oxidized to their analogical sulfones and subsequently extracted, has assured to be one of the exceedingly effective desulfurization processes for resulting ultra-low sulfur import fuels.

What do you mean by desulphurization of fuel oil?

Definition. Removal of sulfur from fossil fuels (or removal of sulfur dioxide from combustion fuel gases) to reduce pollution.

What is used to remove S from crude oil?

Desulfurization is a process used for the effective removal of sulfur from the heavy crude oil.

Does desulphurization efficiency depend on deoxidation?

Further the extent of desulphurization depends on extent of deoxidation. Aluminum killed steel can desulphurize more effectively than the steel where either Fe-Mn or Fe-Si is used to deoxidize the steel.

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 high is sulphur removal in a blast furnace?

Usually roughly 90% of the sulphur is also removed during the BF process. This happens mostly via the slag and about 2–3% via dust and off-gas such as SO₂ and H₂S.

Why Decarburization is done?

The effect of decarburization not only brings down the strength, but also increases the shear strain below the metal surface. The fatigue resistance is decreased while the rate of crack growth and wear rate is increased.

What are the conditions that Favours Dephosphorization?

Conditions for dephosphorization:

High basicity of slag is required. aFeO in slag should be high; slag should be oxidizing. However for efficient dephosphorization the FeO content of slag should be in between 15 to 16%. Low temperature favours high K9.

What is Perrin process?

Briefly described, the Perrin process for refining steel makes use of a synthetic slag in liquid state into which the steel is vigorously poured in such a way that the slag is sub- divided into small droplets which form an emulsion in the molten steel.

Why should salts be removed from crude oil before refining?

Crude oil emulsion is formed as dispersed water phase in an oil medium. The water globules are protected by an oil layer which prevents their coalescence. ... Both the water phase and its dissolved salt contents need to be removed because they lead to corrosion in the refinery equipment.

Is obtained by refining of crude oil?

How crude oil is refined into petroleum products. Petroleum refineries change crude oil into petroleum products for use as fuels for transportation, heating, paving roads, and generating electricity and as feedstocks for making chemicals.

What is oil made of chemically?

Crude oil is a mixture of comparatively volatile liquid hydrocarbons (compounds composed mainly of hydrogen and carbon), though it also contains some nitrogen, sulfur, and oxygen. Those elements form a large variety of complex molecular structures, some of which cannot be readily identified.

What is sulphur used for?

The major derivative of sulphur is sulphuric acid (H2SO4), one of the most important elements used as an industrial raw material. Sulphur is also used in batteries, detergents, fungicides, manufacture of fertilizers, gun power, matches and fireworks.

How do you remove so2 from flue gas?

It is possible to scrub sulfur dioxide by using a cold solution of sodium sulfite; this forms a sodium hydrogen sulfite solution. By heating this solution it is possible to reverse the reaction to form sulfur dioxide and the sodium sulfite solution.

How do you remove sulphur from fuel oil?

The current industrial method for removal of sulfur from fuels is hydrodesulfurization (HDS), which is a high temperature, high pressure catalytic process. This makes HDS a very costly option for deep desulfurization.

Which is the primary function of coke in blast furnace?

Blast furnace ironmaking makes use of coke as the major source for both energy and reduction of iron oxides. In the blast furnace process, coke has multifunctions and plays an important role as reductant, burden support, and fuel.

How do you reduce phosphorus in steel?

The method entails melting a prepared slag in a separate furnace and tapping into the ladle before steel tapping. The induction furnace steel is then tapped onto this slag. The rapid mixing of the slag with the steel during tapping completes the removal of phosphorus even while tapping is going on.

How do you remove oxygen from metal?

Deoxidization is a method used in metallurgy to remove the oxygen content during steel manufacturing. In contrast, antioxidants are used for stabilization, such as in the storage of food. Deoxidation is important in the steelmaking process as oxygen is often detrimental to the quality of steel produced.