CN101760584A - RH-DS furnace convenient for deep sulfur removal vacuum treatment - Google Patents
RH-DS furnace convenient for deep sulfur removal vacuum treatment Download PDFInfo
- Publication number
- CN101760584A CN101760584A CN200910243178A CN200910243178A CN101760584A CN 101760584 A CN101760584 A CN 101760584A CN 200910243178 A CN200910243178 A CN 200910243178A CN 200910243178 A CN200910243178 A CN 200910243178A CN 101760584 A CN101760584 A CN 101760584A
- Authority
- CN
- China
- Prior art keywords
- vacuum chamber
- vacuum
- steel
- soaking tub
- slag
- 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.)
- Pending
Links
Images
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a RH-DS furnace convenient for deep sulfur removal vacuum treatment and belongs to the technical field of molten steel secondary refining. The furnace comprises an oxygen lance, a vacuum pump system, a vacuum chamber main body, a charging chute, a dip pipe, a steel ladle and a steel ladle bottom blowing argon permeable brick, wherein a top blowing oxygen lance is arranged on the top of the vacuum chamber main body; the upper part of the vacuum chamber is connected with the vacuum pump system; the charging chute is arranged on one side of the vacuum chamber main body; the lower part of the vacuum chamber is connected with the dip pipe by a flange; the dip pipe is inserted in the molten steel in the lower part of the steel ladle in the process of vacuum treatment; and the blowing argon permeable brick is arranged on the eccentric position of the steel ladle bottom. The furnace of the invention has the advantages that the temperature in the vacuum chamber can be ensured, the temperature of the hearth and the dip pipe reaches to 1100 DEG C so as to decrease the slag dross, and even if the slag dross forms, a top gun can melt the slag dross in order to prevent the slag dross from gathering.
Description
Technical field
The invention belongs to technical field of molten steel secondary refining, a kind of vacuum treated RH-DS stove of dark desulfurization of being convenient to particularly is provided.
Background technology
One, the development of RH stove and single-mouth refining furnace:
The RH SECONDARY REFINING IN A VACUUM CHAMBER was succeeded in developing by German Rheinstal Huttenwerke steel mill in nineteen fifty-nine, and the dehydrogenation that is mainly used in some steel grade (heavy forging, slab etc.) is at first handled.The eighties in last century the IF output of steel quick increase, drive and promoted the development of RH a refining unit and Technology: large quantities of novel techniques such as RH-OB, RH-KTB, the big circulation RH of high vacuum, double-station RH, RH-MFB, the overwhelming majority is relevant with the production of ultra low carbon IF steel.
University of Science ﹠ Technology, Beijing transform 13 tons RH as single-mouth refining furnace in 1976 with Dalian Steel Plant cooperation: major advantage is to have increased circulation, has prolonged the suction nozzle life-span, adopts eccentric gas permeable brick Argon at the bottom of the ladle, has increased argon gas rising distance.In nineteen eighty-three and Great Wall special steel plant cooperation single-mouth refining furnace has been done the research of comparison system, made the refractory materials problem tentatively obtain solution.Utilize 250 tons of single-mouth refining furnaces in 20 minutes, carbon to be taken off 17ppm in 2004 with Wuhan Iron and Steel Company through preliminary industrial experimentation;
Nippon Steel (Nippon Steel Corporation) is transformed into single-mouth refining furnace (being called REDA-Revolutionary Degassing Acti-vator) in nineteen ninety-five with 175 tons and 350 tons of DH and is used to produce ultra-low carbon steel, 350 tons of REDA can be in 30 minutes with steel in carbon take off to 3ppm, 175 tons of REDA can take off carbon to 4-6ppm in 20 minutes, the interior carbon content of molten steel of tundish reaches 10PPm, scale production before can guaranteeing continuous casting; Slag bonding amount reduces 80% in the vacuum chamber, and the suction nozzle life-span, refractory consumption rate was lower than DH near 500 stoves (suction nozzle life-span＞100 stove during the refining stainless steel).
Two, present vacuum state is realized the relative merits of desulfurization method down:
The desulfurization method of RH vacuum refinement process has two kinds at present:
RH blowing desulfurization pulvis method, desulfurization degree can reach 80～90%, and the molten steel sulphur content is reduced to below the 5ppm (massfraction) by 30ppm.Shortcoming is to need complicated and expensive blowing device.
The RH vacuum chamber drops into the sweetening agent method: to the existing RH device surface speech of major part, need not to add, transform any equipment, method is simple.Shortcoming is that this method and desulfurization degree hang down about 40%.Production ultralow-sulfur steel difficulty.
The VOD stove just is mainly used to steel grades such as smelting stainless steel at present, can make the reduction slag system and carry out desulfurization, desulfurization degree 〉=50% in whole smelting process.Shortcoming is that steel, slag splash are serious and the barrel liner life-span is short in whole converting process.
Summary of the invention
Patent purpose of the present invention is to provide a kind of vacuum treated RH-DS stove of dark desulfurization of being convenient to.
RH-DS stove of the present invention comprises oxygen rifle, vacuum pump system, vacuum chamber body, charging chute, soaking tub, ladle, ladle BOTTOM ARGON BLOWING gas permeable brick.The vacuum chamber bodies top is equipped with that top blow oxygen lance, vacuum chamber body top are connected with vacuum pump system, vacuum chamber body one side is equipped with charging chute, the vacuum chamber bottom is connected soaking tub by flange, soaking tub is inserted in the molten steel of bottom ladle in the vacuum-treat process, and the Argon gas permeable brick is equipped with at eccentric position, ladle bottom.The soaking tub internal diameter is 1000～1200mm.
Technical scheme of the present invention is: the lower channel and the soaking tub system of RH stove are transformed, the upcast and the downtake of RH stove united two into one, form the soaking tub (internal diameter is more than 2 times of original soaking tub) of a big caliber.And the pre-melted slag sulfur method is applied to be called the RH-DS stove on this device in patent (patent publication No. is CN 101463412A) the RH vacuum oven that will apply for early stage, on the basis that does not increase RH winding-up facility, realizes the desulfurizing function of RH stove.Soaking tub internal diameter 1000～1200mm of the present invention, in the vacuum-treat process, (and enough sulfur capacities are arranged with ladle top slag is as much as possible is drawn in the vacuum chamber by the top slag behind the LF stove, has good sweetening power), can add an amount of pre-melted slag by charging chute in the RH-DS stove treating processes and carry out desulfurization, the sulphur content in the steel is controlled at below the 10ppm.
Advantage of the present invention is:
(1) change single-dip pipe into after, the soaking tub internal diameter increases, and most of ladle top slag foamed is arranged in the vacuum-treat process and participate in the molten steel circulation, for the further desulfurization of molten steel provides good dynamic conditions; (2) compare with the LF stove, the vacuum desulfurization is handled not can invar liquid surface turbulence and cause absorption of nitrogen by steel; (3) compare with traditional VOD stove, eliminated the shortcoming that steel in the VOD converting process, slag splash are serious and the barrel liner life-span is short.(4) this equipment soaking tub internal diameter 1000～1200mm is convenient to the maintenance of soaking tub, also is convenient to spray repair, thereby is to create conditions in the life-span of improving anti-material.(5) this equipment comprises top blow oxygen lance, is convenient to the baking in the vacuum chamber, thereby can guarantee the temperature in the vacuum chamber, the temperature of burner hearth and soaking tub is reached more than 1100 ℃, thereby reduce the slag dross, even if also can not produce enrichment after the slag dross by top rifle equipment with its roastingization.
Description of drawings
Fig. 1 is a RH-DS furnace structure synoptic diagram: oxygen gun system 1, vacuum pump system 2, vacuum chamber body 3, charging chute 4, soaking tub 5, Argon gas permeable brick 6.
Specific implementation method:
This RH-DS stove comprises oxygen rifle hole, vacuum suction pipeline, vacuum chamber body, charging chute, soaking tub, Argon gas permeable brick.The vacuum chamber bodies top is equipped with that top blow oxygen lance, vacuum chamber top are connected with vacuum pump system, vacuum chamber body one side is equipped with charging chute, the vacuum chamber bottom is connected soaking tub by flange, soaking tub is inserted in the molten steel of bottom ladle in the vacuum-treat process, and the Argon gas permeable brick is equipped with at eccentric position, ladle bottom.The lower channel and the soaking tub system of RH stove are transformed, the upcast and the downtake of RH stove united two into one, form the soaking tub (internal diameter is more than 2 times of original soaking tub) of a big caliber.Soaking tub internal diameter 1000～1200mm of the present invention,
At BOF-LF-RH-CC explained hereafter ultralow-sulfur steel:
1) the LF stove is made the reducing slag desulfurization, goes to be mingled with;
2) in the RH-DS treating processes, add the special pre-melted slag of 3～8kg (CaO:55～60%, Al by charging chute ton steel
2O
3: 15～25%, SiO
22～8%, MgO:0～5%, S0～0.06%, moisture: 0～0.5%, impurity: 0～1.89) carry out desulfurization;
3) therefore RH-DS stove soaking tub internal diameter 1000～1200mm can make most of LF stove reducing slag and suck vacuum by the special pre-melted slag that its charging chute adds and stop up foamed and participate in the molten steel circulation in the vacuum-treat process;
4) vacuum metling finishes.
Claims (1)
1. be convenient to the vacuum treated RH-DS stove of dark desulfurization for one kind, comprise: oxygen rifle, vacuum pump system, vacuum chamber body, charging chute, soaking tub, ladle, ladle BOTTOM ARGON BLOWING gas permeable brick; It is characterized in that, the vacuum chamber bodies top is equipped with that top blow oxygen lance, vacuum chamber body top are connected with vacuum pump system, vacuum chamber body one side is equipped with charging chute, the vacuum chamber bottom is connected soaking tub by flange, soaking tub is inserted in the molten steel of bottom ladle in the vacuum-treat process, and the Argon gas permeable brick is equipped with at eccentric position, ladle bottom; The soaking tub internal diameter is 1000～1200mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910243178A CN101760584A (en) | 2009-12-31 | 2009-12-31 | RH-DS furnace convenient for deep sulfur removal vacuum treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910243178A CN101760584A (en) | 2009-12-31 | 2009-12-31 | RH-DS furnace convenient for deep sulfur removal vacuum treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101760584A true CN101760584A (en) | 2010-06-30 |
Family
ID=42491962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910243178A Pending CN101760584A (en) | 2009-12-31 | 2009-12-31 | RH-DS furnace convenient for deep sulfur removal vacuum treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101760584A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312052A (en) * | 2011-10-18 | 2012-01-11 | 马钢(集团)控股有限公司 | Flat single-tube vacuum refining device |
| CN114807779A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Heavy rail steel and preparation process thereof |
| CN114807778A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Spring steel and preparation process thereof |
-
2009
- 2009-12-31 CN CN200910243178A patent/CN101760584A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312052A (en) * | 2011-10-18 | 2012-01-11 | 马钢(集团)控股有限公司 | Flat single-tube vacuum refining device |
| CN114807779A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Heavy rail steel and preparation process thereof |
| CN114807778A (en) * | 2022-07-01 | 2022-07-29 | 北京科技大学 | Spring steel and preparation process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102719600A (en) | Production method of ultra low carbon steel | |
| CN101962700A (en) | Method for smelting low-phosphorous molten steel by utilizing semisteel | |
| CN2432219Y (en) | Multifunctional multiple blowing single nozzle refining furnace | |
| CN106148630A (en) | A kind of method of converter smelting low-phosphorous low-sulfur molten steel | |
| CN103266202A (en) | Method for reducing ultra-low carbon steel flocculating flow | |
| WO2018014752A1 (en) | Production process for dephosphorization outside of furnace of molten steel | |
| CN105483501A (en) | Method for smelting phosphorus-containing ultra-low carbon steel | |
| CN108148948B (en) | High-efficiency single-nozzle refining furnace and special steel smelting process | |
| CN111549203B (en) | RH refining method for reducing temperature drop of molten steel and cold steel in vacuum chamber | |
| CN103509912A (en) | Method for controlling temperature rise in secondary combustion of vacuum refining exhaust gas | |
| CN108950127A (en) | A kind of smelting process of Low-phosphorus Steel | |
| CN102443679A (en) | Production method of ultralow oxide inclusion steel | |
| CN106148631A (en) | A kind of method of converter smelting low-sulfur ultralow nitrogen molten steel | |
| CN101760584A (en) | RH-DS furnace convenient for deep sulfur removal vacuum treatment | |
| CN1814814A (en) | Converter smelting method | |
| CN105624367A (en) | Refining device and method for controlling nitrogen content of molten steel | |
| CN102618689B (en) | Process technology method for efficient and low-cost converter production of ultra-low phosphorus liquid steel | |
| CN109576447A (en) | A kind of RH purifier and method promoting the decarburization of molten steel depth | |
| CN111394536A (en) | Control method for N content of high-strength high-aluminum high-vanadium plate blank | |
| CN115011751B (en) | Endpoint manganese alloying control method for high manganese steel converter | |
| CN108486454B (en) | Smelting method of ultra-low phosphorus steel | |
| CN108148945B (en) | A kind of blowing process that RH refining furnace second-time burning efficiency can be improved | |
| CN108796167A (en) | A kind of stainless steel smelting method | |
| CN203096117U (en) | Integrated dipping tube of RH vacuum refining device | |
| CN102719598A (en) | 90-ton basic oxygen furnace bottom maintenance method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20100630 |