US3556775A - Continuous oxygen steel making process - Google Patents
Continuous oxygen steel making process Download PDFInfo
- Publication number
- US3556775A US3556775A US695452A US3556775DA US3556775A US 3556775 A US3556775 A US 3556775A US 695452 A US695452 A US 695452A US 3556775D A US3556775D A US 3556775DA US 3556775 A US3556775 A US 3556775A
- Authority
- US
- United States
- Prior art keywords
- pig iron
- oxygen
- molten
- molten pig
- steel making
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/567—Manufacture of steel by other methods operating in a continuous way
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
- Y10S75/957—Continuous refining of molten iron
Definitions
- This invention relates to continuous oxygen steel making processes and apparatus for the same.
- An object of the present invention is to provide a steel making process high in the productivity and low in the producing cost by continuously oxygen steel making a continuously fed molten pig iron so as to be a molten steel.
- a further object of the present invention is to provide a steel making apparatus high in the durability and low in the equipment cost.
- This invention relates to steel making process and apparatus for continuously refining a molten pig iron, characterized in that the molten pig iron is made to flow down a series of steps or shelves.
- the contact of the molten pig iron with the oxygen is efficiently performed by injecting oxygen from the side of the falling molten pig iron so that such impurities as carbon, silicon, sulfur and phosphorus in the molten pig iron may be oxidized.
- oxygen is jetted and passed across a falling molten pig iron so that the molten pig iron may fall in a splashed state and many of such states are continued on the plurality of steps so that the contact of the molten pig iron and oxygen with each other may be repeated several times in series.
- the molten pig iron and crossing passage of the oxygen are thus continuously carried out several times on the steps, the molten pig iron will be continuously agitated, limestone or any other slagging agent will be continuously repeatedly mixed with the molten pig iron.
- silicon oxide, phosphorus oxide and other oxides accumulated in the molten pig iron will be caught by the slag of the molten slagging agent and will thus move into the slag out of the molten pig iron, and at the same time such gaseous oxides produced by reacting with the oxygen as carbon oxide and sulfur oxide will be discharged out of the molten pig iron.
- the molten pig iron will thus be gradually reduced in the carbon content so as to be made into a molten steel.
- each chamber opened only in the front is formed as a unit device for bringing oxygen into contact with a molten pig iron by providing side walls and a rear wall between vertically adjacent upper and lower shelves so that a wall part may be formed of the molten pig iron falling in the form of a screen from the front edge of the upper shelf in the opened front, the chamber may be closed in an air-tight state, an oxygen feeding orifice for pressing in compressed oxygen is made P CC in the rear wall or side wall of such chamber so that this chamber may be a compressed oxygen chamber, the thus formed device is used as a unit oxygen steel making device and a plurality of such unit devices are connected in the form of steps so that any desired oxygen steel making may be carried out continuously.
- FIG. 1 is a steel making apparatus body or refining chamber of the present invention.
- a slagging agent feeder 2 In thefupper part of the body is provided a slagging agent feeder 2.
- an oxygen chamber 17, 27, 37 provided with side walls 16, 1'6, 26, 26', 36, 36' on both sides and opened only in the front with the rear wall 15, 25, 35 the lower surface 14, 24, 34 of the upper shelf and the floor surface 22, 32, 42 of the lower shelf.
- each rear wall 15 25, 35 is provided a compressed oxygen feeding orifice 18, 28, 38 connected with a compressed oxygen feeding main pipe 5.
- 3 is a molten pig iron pool located in the upper part.
- 4 is a molten steel pool located in the lower part.
- a molten pig iron 6 is continuously fed to this steel making apparatus through a molten pig iron flowing inlet in the uppermost part and a slagging agent 7 such as limestone is fed and added to it in the molten pig iron pool 3 in the upper part from a slagging agent feeder 2, the molten pig iron to which this slagging agent has been added will lie on the floor surface 12 of the shelf 11 in the uppermost position. The molten material will then fall along the front edge 13 of the shelf 11. Then it falls in the form of a screen down the opened part in the front of the oxygen chamber 17 and will tend to air-tightly close the oxygen chamber 17.
- such impurities as carbon, silicon, sulfur and phosphorus in the molten pig iron will be oxidized by contact with the oxygen, whereby the produced gaseous oxides such as carbon oxide and sulfur oxide will be discharged out of the molten 'pig iron.
- the silicon oxide and phosphorus oxide remaining in the molten pig iron will be caught by the slag which is a melt of the slagging agent mixed with the molten pig iron and will then melt into the slag.
- I claim: 1. A continuous flow process for producing steel from a molten pig iron solution in a vertical refining chamber which includes a large number of shelf members having horizontal and vertical surfaces comprising the stages of introducing a slagging agent in a pool of molten pig iron at the top of the chamber,
- the molten metallic material to flow from the horizontal surface over the edge of the first shelf member to form a screen of free falling droplets, subjecting the screen of droplets to jetted streams of an oxidizing gas which are directed at right angles to the screen, the droplets in this manner forming a shallow pool on the horizontal surface of the second shelf member and then pouring over the edge of the second shelf, the molten metallic material as a result of the above mentioned operations thereon having a turbulence and cascading characteristic, repeating the cycle stages of jetting oxygen to the 4 screen of droplets, the formation of the pool on the horizontal shelf surface and the descent of the molten metallic material with respect to each individual shelf member for oxidizing the impurities from the molten metallic material, and the collection of the resulting refined steel material from the lowest shelf member of the vertical chamber.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
THIS INVENTION IS TO PROVIDE A PROCESS AND APPARATUS FOR OXIDIZING SUCH IMPURITIES AS CARBON, SILICON, SULFUR AND PHOSPHORUS IN A MOLTEN PIG IRON BY INJECTING OXYGEN FROM THE SIDE OF THE MOLTEN PIG IRON WHILE IT IS BEING MADE TO FLOW DOWN A SERIES OF SHELF MEMBERS IN A VERTICAL REFINING CHAMBER.
Description
Jill. 19, 1971 TATSUQ KURATOMI 3,556,775
' CONTINUOUS OXYGEN STEEL MAKING PROCESS Filed Jan. :3, 1968 INVEN'H )R 'l'I/ISUO KUHATOMI A ()RNIZ'Y United States Patent O U.S. CI. 75-60 1 Claim ABSTRACT OF THE DISCLOSURE This invention is to provide a process and apparatus for oxidizing such impurities as carbon, silicon, sulfur and phosphorus in a molten pig iron by injecting oxygen from the side of the molten pig iron while it is being made to flow down a series of shelf members in a vertical refining chamber. 1
BACKGROUND OF THE INVENTION This invention relates to continuous oxygen steel making processes and apparatus for the same.
An object of the present invention is to provide a steel making process high in the productivity and low in the producing cost by continuously oxygen steel making a continuously fed molten pig iron so as to be a molten steel.
A further object of the present invention is to provide a steel making apparatus high in the durability and low in the equipment cost.
SUMMARY OF THE INVENTION This invention relates to steel making process and apparatus for continuously refining a molten pig iron, characterized in that the molten pig iron is made to flow down a series of steps or shelves. The contact of the molten pig iron with the oxygen is efficiently performed by injecting oxygen from the side of the falling molten pig iron so that such impurities as carbon, silicon, sulfur and phosphorus in the molten pig iron may be oxidized.
That is to say, oxygen is jetted and passed across a falling molten pig iron so that the molten pig iron may fall in a splashed state and many of such states are continued on the plurality of steps so that the contact of the molten pig iron and oxygen with each other may be repeated several times in series. When the flow and fall of the molten pig iron and crossing passage of the oxygen are thus continuously carried out several times on the steps, the molten pig iron will be continuously agitated, limestone or any other slagging agent will be continuously repeatedly mixed with the molten pig iron. Therefore silicon oxide, phosphorus oxide and other oxides accumulated in the molten pig iron will be caught by the slag of the molten slagging agent and will thus move into the slag out of the molten pig iron, and at the same time such gaseous oxides produced by reacting with the oxygen as carbon oxide and sulfur oxide will be discharged out of the molten pig iron. The molten pig iron will thus be gradually reduced in the carbon content so as to be made into a molten steel.
Further, in the present apparatus for fully carrying out such oxidizing operation, each chamber opened only in the front is formed as a unit device for bringing oxygen into contact with a molten pig iron by providing side walls and a rear wall between vertically adjacent upper and lower shelves so that a wall part may be formed of the molten pig iron falling in the form of a screen from the front edge of the upper shelf in the opened front, the chamber may be closed in an air-tight state, an oxygen feeding orifice for pressing in compressed oxygen is made P CC in the rear wall or side wall of such chamber so that this chamber may be a compressed oxygen chamber, the thus formed device is used as a unit oxygen steel making device and a plurality of such unit devices are connected in the form of steps so that any desired oxygen steel making may be carried out continuously.
BRIEF DESCRIPTION OF THE DRAWING The accompanying drawing is a vertically sectional view showing an apparatus for working the continuous oxygen steel making process according to the present invention.
DESCRIPTION OF PREFERRED EMBODIMENT The apparatus and process of this invention shall be explained with reference to the drawing. 1 is a steel making apparatus body or refining chamber of the present invention. In thefupper part of the body is provided a slagging agent feeder 2. Within said steel making apparatus body 1, there are molten pig iron flowing shelves 11, 21, 31 provided continuously in the form of several steps as main bodies of steel making devices for working the continuous oxygen steel making process of the present invention. In each space part between the 5 vertically adjacentfupper shelf and lower shelf, there is -formed an oxygen chamber 17, 27, 37 provided with side walls 16, 1'6, 26, 26', 36, 36' on both sides and opened only in the front with the rear wall 15, 25, 35 the lower surface 14, 24, 34 of the upper shelf and the floor surface 22, 32, 42 of the lower shelf.
Further, in each rear wall 15, 25, 35 is provided a compressed oxygen feeding orifice 18, 28, 38 connected with a compressed oxygen feeding main pipe 5. 3 is a molten pig iron pool located in the upper part. 4 is a molten steel pool located in the lower part.
Now, if a molten pig iron 6 is continuously fed to this steel making apparatus through a molten pig iron flowing inlet in the uppermost part and a slagging agent 7 such as limestone is fed and added to it in the molten pig iron pool 3 in the upper part from a slagging agent feeder 2, the molten pig iron to which this slagging agent has been added will lie on the floor surface 12 of the shelf 11 in the uppermost position. The molten material will then fall along the front edge 13 of the shelf 11. Then it falls in the form of a screen down the opened part in the front of the oxygen chamber 17 and will tend to air-tightly close the oxygen chamber 17. However, as compressed oxygen fed through the compressed oxygen feeding main pipe 5 is being jetted into the oxygen chamber 17 through the orifice 18, the above mentioned molten pig iron in the form of a screen will be blown away by this compressed oxygen so as to be flowing drops and splashes and will fall onto the floor surface 22 of the lower shelf 21 while exposing a large surface of contact with the oxygen.
In such case, such impurities as carbon, silicon, sulfur and phosphorus in the molten pig iron will be oxidized by contact with the oxygen, whereby the produced gaseous oxides such as carbon oxide and sulfur oxide will be discharged out of the molten 'pig iron. The silicon oxide and phosphorus oxide remaining in the molten pig iron will be caught by the slag which is a melt of the slagging agent mixed with the molten pig iron and will then melt into the slag.
When such reaction cycle of the molten pig iron with oxygen is repeated as the molten pig iron falls from one shelf down to the next shelf. The content of carbon and the content of other impurities in the molten pig iron is reduced to the desired contents. The compressed oxygen feeding orifice of the shelf should then be closed to stop the injection of oxygen. Therefore, on the shelves below it, the melt which has already become a molten steel will merely flow and fall until it flows into the molten steel' pool 4 in the lowermost part. In this molten steel pool 4 the molten steel will flow slowly at a reduced flow velocity, the slag will fioat out of the molten material and separate from the molten steel. The molten steel 8 and the slag 9 will thus continuously flow out through respective flowing outlets.
I claim: 1. A continuous flow process for producing steel from a molten pig iron solution in a vertical refining chamber which includes a large number of shelf members having horizontal and vertical surfaces comprising the stages of introducing a slagging agent in a pool of molten pig iron at the top of the chamber,
causing the molten metallic material to flow from the horizontal surface over the edge of the first shelf member to form a screen of free falling droplets, subjecting the screen of droplets to jetted streams of an oxidizing gas which are directed at right angles to the screen, the droplets in this manner forming a shallow pool on the horizontal surface of the second shelf member and then pouring over the edge of the second shelf, the molten metallic material as a result of the above mentioned operations thereon having a turbulence and cascading characteristic, repeating the cycle stages of jetting oxygen to the 4 screen of droplets, the formation of the pool on the horizontal shelf surface and the descent of the molten metallic material with respect to each individual shelf member for oxidizing the impurities from the molten metallic material, and the collection of the resulting refined steel material from the lowest shelf member of the vertical chamber.
References Cited UNITED STATES PATENTS 2,600,575 6/1952 Reinartz et al 7546X 2,639,984 5/1953 Jordan 7560X 2,693,411 11/1954 Cremer 7546 2,819,160 1/1958 Bannister et al. 7560UX 2,915,380 12/1959 Hilty 7560X 2,969,282 1/1961 Churcher 7560 FOREIGN PATENTS 817,783 8/1959 Great Britain 7560 HYLAND BIZOT, Primary Examiner G. K. WHITE, Assistant Examiner US. Cl. X.R. 7546
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3959167 | 1967-06-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3556775A true US3556775A (en) | 1971-01-19 |
Family
ID=12557330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US695452A Expired - Lifetime US3556775A (en) | 1967-06-22 | 1968-01-03 | Continuous oxygen steel making process |
Country Status (1)
Country | Link |
---|---|
US (1) | US3556775A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3865579A (en) * | 1970-01-05 | 1975-02-11 | Koppers Co Inc | Method and apparatus for the production of steel |
US3915694A (en) * | 1972-09-05 | 1975-10-28 | Nippon Kokan Kk | Process for desulphurization of molten pig iron |
US3980283A (en) * | 1971-02-16 | 1976-09-14 | Gesellschaft Zur Forderung Der Eisenhuttentechnik Mbh | Apparatus for performing a continuous metallurgical refining process |
US4052197A (en) * | 1975-02-25 | 1977-10-04 | Stahlwerke Peine-Salzgitter Ag | Process for making steel from pig iron |
US4900532A (en) * | 1987-08-19 | 1990-02-13 | Bayer Aktiengesellschaft | Continuous process for refining silicon |
US4978106A (en) * | 1986-09-17 | 1990-12-18 | Kelmar John J | Iron reduction apparatus |
US20150122083A1 (en) * | 2012-05-14 | 2015-05-07 | Posco | High Cleanliness Molten Steel Production Method and Refining Device |
-
1968
- 1968-01-03 US US695452A patent/US3556775A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3865579A (en) * | 1970-01-05 | 1975-02-11 | Koppers Co Inc | Method and apparatus for the production of steel |
US3980283A (en) * | 1971-02-16 | 1976-09-14 | Gesellschaft Zur Forderung Der Eisenhuttentechnik Mbh | Apparatus for performing a continuous metallurgical refining process |
US3915694A (en) * | 1972-09-05 | 1975-10-28 | Nippon Kokan Kk | Process for desulphurization of molten pig iron |
US4052197A (en) * | 1975-02-25 | 1977-10-04 | Stahlwerke Peine-Salzgitter Ag | Process for making steel from pig iron |
US4978106A (en) * | 1986-09-17 | 1990-12-18 | Kelmar John J | Iron reduction apparatus |
US4900532A (en) * | 1987-08-19 | 1990-02-13 | Bayer Aktiengesellschaft | Continuous process for refining silicon |
US20150122083A1 (en) * | 2012-05-14 | 2015-05-07 | Posco | High Cleanliness Molten Steel Production Method and Refining Device |
US9752202B2 (en) * | 2012-05-14 | 2017-09-05 | Posco | High cleanliness molten steel production method and refining device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE60019680T2 (en) | direct smelting furnace | |
DE60031206T2 (en) | Method for starting a direct melting process | |
US3326672A (en) | Refining of metals and alloys | |
DE60014802T2 (en) | Pressure control of a direct melting process | |
US3832163A (en) | Process for continuous smelting and converting of copper concentrates | |
US3556775A (en) | Continuous oxygen steel making process | |
US3542351A (en) | Spray refining | |
US4073646A (en) | Method for the thermal refinement of greatly contaminated copper in molten phase | |
US3617042A (en) | Apparatus for continuous refining of molten metals | |
EP0118412A2 (en) | Method of carrying out melting, melt-metallurgical and/or reduction-metallurgical processes in a plasma melting furnace as well as an arrangement for carrying out the method | |
DE60131426T2 (en) | METHOD AND DEVICE FOR DIRECTLY MELTING | |
AT407403B (en) | PYROMETALLURGIC SYSTEM | |
US4696458A (en) | Method and plant for fully continuous production of steel strip from ore | |
US2969282A (en) | Treatment of ferrous metal | |
DE3022790C2 (en) | Process for oxidizing molten low iron metal stone to raw metal | |
DE2827277C3 (en) | Device for refining melts with the aid of powdery substance (solid) and / or gas | |
DE3335859C2 (en) | ||
US3801305A (en) | Process for continuously refining metals,notably,pig-iron | |
DE10333764B3 (en) | Charging fine, directly-reduced iron particles into arc furnace, passes stream of bulk material from downcomer through orifice plate, to enter furnace largely undisturbed | |
US3300300A (en) | Method for the treatment of zinciferous metallurgical slags and apparatus therefor | |
EP0276032B1 (en) | Instant smelting process for sulfidic ores | |
DE3539164C1 (en) | Process and smelting furnace for producing non-ferrous metals | |
US1063486A (en) | Method of obtaining values from copper-bearing material. | |
US3058734A (en) | Treatment of molten ferrous material | |
DE2144962C3 (en) | Process and plant for continuous steel production |