Field of the Invention
This invention relates to the desulphurization of hot metal and in particular, this invention relates to the desulphurization of hot metal wherein Aluminum Powder is used as agent. More particularly, this present invention relates to the desulphurization of hot metal wherein the hot metal should contain very low oxygen to make this process effective,. Furthermore, this invention also relates to the desulphurization of hot metal which has the beneficial effects of having saving manpower, safety and reliability and resources are used effectively, and economic benefits are high.
Background of the invention and the related Prior Art
Desulfitrization of molten metal by magnesium is well known, for example, in the steel manufacturing process. Generally, magnesium is introduced into the molten hot metal by any of a variety of means, for example, a desulfurization reagent may be added during steel manufacturing through injection lances. Upon injection, the magnesium melts, then vaporizes, and then the vapors dissolve into the molten hot metal. The dissolved magnesium reacts with sulfur present in the molten hot metal and forms magnesium sulfide, an insoluble compound. This insoluble compound has a density less than the density of molten hot metal and, thus, floats to the top of the molten metal and then mixes

with the slag that is also floating on top of the liquid metal. The sulfur is removed by removal of the slag layer in a subsequent step. It is also well known that magnesium when injected into steel causes a violent reaction, for example, the addition of magnesium in particulate form, the violent reaction may take place in the form of bubbling, splattering, or the like. Also, finely ground particulate dust is difficult to meter in injection processes and such finely ground dust injectables create a hazard in handling. For example, finely ground particulate when exposed to high temperatures and oxygen may produce an explosion. Such may be the case with handling finely ground magnesium granules injected into a molten hot metal, such as molten steel, normally at process temperatures of up to about 1800 degrees centigrade.
The patent document US4600434 states that a process for magnesium desulfurization of ferrous metal melts in a vessel comprising the provision of a fluid, high sulfur capacity slag wherein the weight ratio of slag constituents associated with sulfur to slag constituents associated with oxygen is greater than 0.8, followed by addition of magnesium to the melt in an amount sufficient to combine with the sulfur in the melt, transfer to the sulfur removed by the magnesium addition to the slag, and retention of the removed sulfur in the slag, thereby improving magnesium desulfurization efficiency and substantially eliminating sulfur reversion from the slag back to the melt.

US4,341,554, discloses a process for desulfurizing molten steel which comprises covering the melt with a synthetic slag layer, adding particulate lime to cover the synthetic slag, the lime being of a size such that substantially all is retained on a No. 80 sieve, injecting powdered lime into the melt along with a desulfurizing agent which vaporizes under the pressure and temperature conditions within the melt, and permitting the powdered lime to rise to the surface of the melt and form together with the particulate lime a crust which deters entry of ambient air into the melt. Preferred desulfurizing agents are magnesium and calcium silicon. The purpose of adding a particulate lime cover and for injecting powdered lime along with the desulfurizing agent is to eliminate the need for a mechanical cover over the ladle.
U.S. Pat. No. 4,374,664, discloses a process for desulfurization of molten pig iron by addition of aluminum powder and lime, alumina or both, whereby to reduce the splashing associated with the addition of aluminum alone. The amount of aluminum added is sufficient to result in an aluminum content in the pig iron in weight percent of 0.01-0.1 times the concentration of silicon in the molten pig iron plus 0.2-1.0 times the concentration of sulfur in weight percent to be removed from the molten pig iron. The addition of aluminum prior to desulfurization is alleged to be for the purpose of improving the poor

desulfurization efficiency of lime by preventing formation of high melting point shells of calcium silicate on the surfaces of the lime particles, derived from the silicon in the molten pig iron which is oxidized on the surfaces of the lime particles.
U.S. Pat. No. 4,398,947 discloses a desulfurization reagent including magnesium granules containing a coating of an anti-caking agent consisting of stearates of Mg, Ca and Al.
U.S. Pat. No. 4,401,465 discloses a desulfurization reagent including substantially nonhygroscopic flux coated magnesium granules containing a coating of fluoride-containing salt such as alkali and alkaline earth metal fluorides and fluorborates.
The document EP0398674 describes the desulphurization agent employed in the present invention comprises a uniform mix of preferably commercial calcium carbide and a flux agent. The flux agent is one or more agents selected from the group consisting of silicon dioxide and calcium aluminate slag. The calcium aluminate slag may comprise a uniform mixture of calcium oxide, aluminium oxide, and calcium fluoride. Preferably, a metal oxide such as an iron oxide or a manganese oxide is included in the formulation of the desulphurising agent of the present invention. When silicon dioxide is used as the flux agent, it is preferred that calcium fluoride (CaF2) is added to the uniform mix of calcium

carbide and silicon dioxide alone or in combination with the metal oxide. The preferred metal oxides are ferric oxide (Fe203), ferrosoferric oxide (Fe^O-O, manganic oxide (M112O3) and manganomanganic oxide (MnsCk). The invention consists of certain novel features and a combination of steps hereinafter fully described, and particularly pointed out in the appended claims, it being understood that various changes in the details may be made without departing from the spirit, or sacrificing any of the advantages of the present invention.
Summary of the invention
This invention relates to the desulphurization of hot metal and in particular, this invention relates to the desulphurization of hot metal wherein Aluminum Powder is used as agent. More particularly, this present invention relates to the desulphurization of hot metal wherein the hot metal should contain very low oxygen to make this process effective,. Furthermore, this invention also relates to the desulphurization of hot metal which has the beneficial effects of having saving manpower, safety and reliability and resources are used effectively, and economic benefits are high.
Detailed description of the invention with accompanying drawings

For the purpose of facilitating an understanding of the invention, there is
illustrated in the preferred embodiment thereof, from an inspection of which,
when considered in connection with the following description, the invention, its
construction and operation, and many of its advantages should be readily
understood and appreciated.
The principal object of the invention is to provide the desulphurization of hot
metal.
The other object of the invention is to provide the desulphurization of hot metal
wherein Aluminum Powder is used as agent.
The another object of the invention is to provide the desulphurization of hot
metal wherein the hot metal should contain very low oxygen to make this
process effective.
The another object of the invention is to provide the desulphurization of hot
metal wherein de-oxidation process is carried out to remove Oxygen of lime
which is released during process.
The another object of the invention is to provide the desulphurization of hot
metal wherein Slag Conditioner is 0-10%.
The another object of the invention is to provide the desulphurization of hot
metal wherein Al powder is 2-25%.
The another object of the invention is to provide the desulphurization of hot
metal wherein other additive is 0-8%.

The another object of the invention is to provide the desulphurization of hot metal wherein composition further comprises CaO.
The present invention relates to Desulphurization of hot metal (HMDS). In particular, it relates to the development of an alternate material, other than Magnesium (Mg), to carry out deoxidation function in hot metal during HMDS process. The alternate material developed in this invention is Aluminium Powder (ALP). This alternate material replaces, partially or fully, Magnesium, which is currently being used for the intended application.
Desulphurisation of hot metal relates to removal of Sulphur from hot metal as
high Sulphur initiates cracks during rolling process as -
Sulphur affects both internal and surface quality of steel
Formation of iron sulphide (lowers the melting point) which promotes
granular weakness and cracks in steel during solidification
• Rolling and forging becomes very difficult due to hot shortness in the presence of Sulphur
• High Sulphur also contributes to the brittleness of steel and its existence in sulphide phase acts as a stress raiser in steel products
The main object of this invention is to reduce usage of Magnesium in HMDS and to replace the deoxidation function of Magnesium by addition of an

alternate material like Aluminium Powder and it also reduce/ eliminate risk of hazards associated with Magnesium.
In the process of the present invention the Slag Conditioner is 0-10%, Al powder is 2-25%, other additive is 0-8% and remaining part is calcium Oxide.
The present invention relates to Desulphurization of hot metal (HMDS). To make HMDS process effective, the hot metal should contain very low oxygen. Oxygen of lime, released during HMDS, has to be removed by some element (deoxidation). Presently, this deoxidation is being performed by Magnesium. Magnesium is not only expensive but also hazardous to store and use. Hence, it is required to be replaced, partially or fully, by any material which can carry out the required deoxidation function. An alternate material, Aluminium Powder (ALP), has been found to be suitable for the purpose. Aluminum powder will replace Magnesium partially or fully for this function. As Aluminum powder is cheaper and less hazardous than Magnesium, it also serves the third and fourth object of this invention.
Without further elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current of future knowledge, readily adapt the same for use under various conditions of service. It should also be realized by

those skilled in the art that such equivalent constructions do not depart from the
spirit and scope of the invention.
Advantages over the prior art
The desulphurization of hot metal proposed by the present invention has the
following advantages over the prior art:
a) It is cost effective beneficial to society.
b) This system is useful for maintaining hygiene of the society.
c) This system is user friendly,
In the preceding specification, the invention has been described with reference to specific exemplary embodiments thereof. It will be evident that various modifications and changes may be made thereunto without departing from the broader spirit and scope of the invention as set forth in the claims that follow. The specification and drawings are accordingly to be regarded in an illustrative rather than restrictive sense. Therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention. The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only and not as a limitation. The actual scope of the invention is intended to be defined in the following claims when viewed in their proper perspective based on the prior art.

We claim:
1) A desulphurization of hot metal Slag which comprises slag Conditioner, Al powder, other additive and CaO.
2) The desulphurization of hot metal Slag as claimed in claim 1 wherein Aluminum Powder is used as agent.
3) The desulphurization of hot metal Slag as claimed in claim 1 wherein the hot metal should contain very low oxygen to make this process effective.
4) The desulphurization of hot metal Slag as claimed in claim 1 wherein de-oxidation process is carried out to remove Oxygen of lime which is released during process.
5) The desulphurization of hot metal Slag as claimed in claim 1 wherein Slag Conditioner is 0-10%.
6) The desulphurization of hot metal Slag as claimed in claim 1 wherein Al powder is 2-25%.
7) The desulphurization of hot metal Slag as claimed in claim 1 wherein other additive is 0-8%.
8) The desulphurization of hot metal Slag as claimed in claim 1 wherein composition further comprises CaO.
Dated this 29.th day of May, 2019