CN103555889A - Device and method for quickly removing occluded foreign substances in molten steel - Google Patents
Device and method for quickly removing occluded foreign substances in molten steel Download PDFInfo
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- CN103555889A CN103555889A CN201310507231.7A CN201310507231A CN103555889A CN 103555889 A CN103555889 A CN 103555889A CN 201310507231 A CN201310507231 A CN 201310507231A CN 103555889 A CN103555889 A CN 103555889A
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Abstract
The invention discloses a device and a method for quickly removing occluded foreign substances in molten steel, and relates to the field of production of a high-quality steel product. The basic principle is that high-purity argon is blown at the bottom of a molten steel container; a certain amount of specific ventilating elements are arranged according to the demands; a lot of tiny bubble areas are generated in the molten steel which is primarily melted or refined; the molten steel is subjected to purification treatment; the occluded foreign substances in the molten steel are efficiently and quickly promoted to enter inside top residue to be removed in catching and rising manners. The device is composed of a container (steel ladle or tundish) (1) of containing the molten steel, a plurality of specific conical bottom blowing elements (2), a guard brick (6), a bottom blowing gas adjusting system (7) and the like. The device has the advantages of being large in dispersed bubble coverage area of bottom air supply in the molten steel, fast in removal rate of the occluded foreign substances, and high in gas utilization rate; a specific air supply element has the convertibility and the like; the refining requirements of high-quality steel can be met.
Description
Technical field
The invention belongs to steelmaking equipment technical field, particularly relate to the quick removal device of a kind of inclusion content in melting steel and method, first steel-making water is carried out to a refining unit and the method for quick removal of inclusions, these apparatus and method are removed inclusion content in melting steel rapidly and efficiently, are applicable to high-quality steel and produce.
Background technology
The size of the inclusion in molten steel, quantity, distribution, kind etc. are of great impact to steel product quality, and the quantity that farthest reduces various inclusiones in molten steel has become one of significant effort direction improving steel quality.Mode and the device of liquid steel refining mainly contain common steel ladle bottom argon blowing, CAS/CAS-OB refining furnace both at home and abroad at present, LF ladle refining furnace, RH vacuum cycle refining furnace, VD/VOD vacuum refining furnace etc., the speed that these traditional refining furnaces are removed inclusion content in melting steel is all very slow, and efficiency is not very high.Inclusion particularly fine foreign matter is all driven and is floated to the interface that slag or molten steel contacts with refractory materials by bubble or molten steel stream in molten steel, then by the absorption of the slag at molten steel top or the refractory materials adhesion contacting with molten steel and be removed.At conventional steel ladle bottom argon blowing, CAS-OB a refining unit, LF refining furnace, in a refining units such as VD/VOD vacuum refinement, molten steel stirring movement relies on argon bottom-blowing, general list or the Double bottom blowing air element of adopting, in order to prevent secondary oxidation, general argon bottom-blowing flow is smaller, bottom-blowing air feed element is single, bubble diameter is fewer than larger amt, in ladle, bubble overlay area is smaller, thereby inclusion content in melting steel particularly fine foreign matter is less by bubble capture probability, the inclusion that part is taken to top slag or refractory surface by bubble and molten steel stream is because the effect of liquid stream is easily entered in molten steel inside by rollback, make inclusion content in melting steel removal speed and efficiency all lower.In order to obtain good removal of inclusions effect, a refining unit and production technique adopt in the slag blanket that relies on weak stirring or the molten steel method that circulates at a slow speed inclusion content in melting steel to be taken to molten steel surface and remove mostly, make refining time very long, molten steel temperature drop is larger, and smelting cost and rhythm of production are all a greater impact.Along with modern industry and bullet train, ocean-going vessel, air transportation etc. need to increase considerably high-quality steel, the apparatus and method of the ultralow inclusion content steel of traditional mode of production can not meet ever-increasing market demand in the aspects such as Yield and quality at present.
Summary of the invention
The object of the present invention is to provide the quick removal device of a kind of inclusion content in melting steel and method, can rapidly and efficiently remove inclusion content in melting steel, be applicable to producing the very low molten steel of the amount of inclusions in enormous quantities, meet the requirement that high efficiency, low cost is produced high-quality steel.
The ultimate principle of the quick removal device of inclusion content in melting steel and method is exactly: utilize bubble adhesion inclusion and drive inclusion floating rule, strengthen tiny bubble coverage area in molten steel, increase substantially removal of inclusions speed and efficiency.
The present invention arranges specific gas supply element 2 at Sheng steel in water container 1 bottom multi-position, by argon bottom-blowing (rare gas element), in the larger regional extent of molten steel, produce a large amount of floating micro-bubbles, catch as much as possible in a short period of time inclusion content in melting steel and take in the slag of molten steel top and remove, realizing the object of rapidly and efficiently removal of inclusions raising steel quality.
The inventive system comprises: contain steel in water container 1, specific gas supply element 2, protect brick 6, bottom blown gas regulation system 7 etc.In Sheng steel in water container 1 bottom, specific gas supply element 2 is installed, by bottom blowing rare gas element, in processed molten steel 3, produce large-scale fine bubble 4 rising areas, by being distributed in a large number farthest capture clip foreign material of micro-bubble in molten steel, promote it to float in top slag 5 and be removed and purify hot metal; Specific gas supply element 2 peripheries are provided with protects brick 6, and bottom blown gas regulation system 7 is connected with specific gas supply element 2 by pipeline 13, controls Bottom Blowing Gas Flow Rate size.
These specific gas supply element 2 tops are that refractory materials (magnesium carbonaceous, corundum, magnesium chromium etc.) 10 is covered with straight-through or crooked micropore 11, micropore 11 spacing 5-30mm internal diameter 0.5-1.5mm.Bottom is that air chamber (12) distributes each micropore 11 air inlets, and air chamber is connected with inlet pipe 13.
At the specific gas supply element 2 of containing steel in water container 1 bottom installation, there is convertibility.During installation, by containing steel in water container 1 lateral pre-installation, there is the bottom of protecting brick 6 to insert specific gas supply element 2.Specific gas supply element 2 diameters in bottom are 30-300mm, and specific gas supply element 2 numbers are 3-24, and limit portion spacing is greater than 100mm(and indicates: from the life-span, consider only minimum spacing is had to requirement).
Inclusion content in melting steel of the present invention removal method is fast in Sheng steel in water container 1 bottom, to avoid mouth of a river district 8 and molten steel impact zone 9 a plurality of specific gas supply elements 2 that can produce a large amount of micro-bubbles are installed, by bottom blowing rare gas element, in processed molten steel 3, produce large-scale fine bubble 4 rising areas, by being distributed in a large number farthest capture clip foreign material of micro-bubble in molten steel, promote it to float in top slag 5 and be removed and purify hot metal.Bottom blowing rare gas element total gas flow rate is molten steel 0.001-0.03m per ton
3/ min.Each specific gas supply element bottom blowing flow adopts alone or in combination to be controlled.
Innovation of the present invention is:
In melted steel container 1 bottom, a plurality of specific gas supply elements 2 are installed.During refining, be blown into rare gas element from specific gas supply element 2 to molten steel and produce a large amount of micro-bubbles, in the molten steel in melted steel container 1, form large-scale inclusion and catch and remove district, effectively rapidly removal of inclusions.In order to realize, in the molten steel of melted steel container 1, at utmost form micro-bubble coverage area, first design the specific gas supply element 2 of the small pore of a kind of tool distribution at regular intervals, small hole diameter 0.5-1.5mm, can be when bottom blown gas not, prevent that molten steel from entering in small pore, produces micro-bubble in molten steel during bottom blown gas.In specific gas supply element induction part, have air chamber 12, air chamber effect is that the rare gas element passing into from is outward assigned in each small pore equably, and micro-pore 11 of specific gas supply element 2 inside has through-type and flexure type.The position that specific gas supply element 2 is arranged at melted steel container 1 is uniformly distributed under the condition of molten steel stream impact zone when avoiding mouth of a river district 8, tapping, and the interval between specific gas supply element 2 is greater than 100mm, makes the micro-bubble overlay area of its generation large as far as possible.In process of production, it is very serious that the face of giving vent to anger of specific gas supply element 2 is subject to molten steel to wash away stirring, its life-span is difficult to synchronize with other positions, for this reason, employing fast online replacement mode (hydraulic pressure is electronic or artificial etc.), certain specific gas supply element 2 end invade damage relatively serious after, can change rapidly, guarantee to produce and normally carry out.Each specific gas supply element 2 bottom blowing flow can regulate separately control also can a plurality of specific gas supply elements to combine and regulate.
The invention has the beneficial effects as follows: the apparatus and method that adopt removal inclusion content in melting steel of the present invention, can in the melted steel container (1) of refined molten steel, produce large-scale micro-bubble purification of molten steel district, the fast efficiency of inclusion removal speed is high, removal efficiency of the inclusion can reach 95% in 6-8 minute, common BOTTOM ARGON BLOWING needs 20-30 minute just can reach this effect above, and apparatus and method of the present invention are conducive to the efficient production fast of high-quality special steel.
Accompanying drawing explanation
Fig. 1 is the quick removal device of inclusion content in melting steel.
Fig. 2 is that typical specific gas supply element distributes.
Fig. 3 is specific gas supply element and protects brick assembling.
In figure: contain steel in water container 1, specific gas supply element 2, molten steel 3, fine bubble 4, top slag 5, protect brick 6, bottom blown gas regulation system 7, the mouth of a river 8, molten steel impact zone 9, refractory materials (magnesium carbonaceous, corundum, magnesium chromium etc.) 10, straight-through or crooked micropore 11, air chamber 12, inlet pipe 13.
Embodiment
The inventive system comprises: contain steel in water container 1, specific gas supply element 2, protect brick 6, bottom blown gas regulation system 7 etc.In Sheng steel in water container 1 bottom, specific gas supply element 2 is installed, by bottom blowing rare gas element, in processed molten steel 3, produce large-scale fine bubble 4 rising areas, by being distributed in a large number farthest capture clip foreign material of micro-bubble in molten steel, promote it to float in top slag 5 and be removed and purify hot metal; Specific gas supply element 2 peripheries are provided with protects brick 6, and bottom blown gas regulation system 7 is connected with specific gas supply element 2 by pipeline 13, controls Bottom Blowing Gas Flow Rate size.
Bottom in ladle, avoiding under the condition of 8th district, the mouth of a river and molten steel impact zone 9, be uniformly distributed 11 specific gas supply elements 2 are installed, so both can prevent that the specific gas supply element life-span was too short, can make again the mouth of a river 8 not be subject to molten steel stream washes away, at utmost in ladle, form molten steel micro-bubble purifying area as far as possible on a large scale simultaneously, greatly improve inclusion content in melting steel and remove speed and efficiency.Specific gas supply element 2 peripheries are provided with protects brick 6, has both played specific gas supply element 2 provide protections, can invade and when damage seriously need to be changed, not damage bottom at specific gas supply element 2 again.The complete tapping of converter or electric arc furnace smelting, molten steel is being carried out to alloying, just deoxidation, during the operation such as deep deoxidation desulfurization, first by 1 to two specific gas supply element 2, by the gas flow bottom blowing of molten steel 0.008m3/min per ton, stir molten steel 6min, mix composition and temperature in molten steel, promote slag-metal reaction, then adopting, by the bag end, all specific gas supply element 2 filling being installed is that molten steel 0.001m3/min per ton is blown into gas by the bottom blowing flow of each specific gas supply element 2, produce atm number micro-bubble, molten steel is carried out to the inclusion purifying treatment of 10min, inclusion content in melting steel is reduced to rapidly to the requirement that meets high-quality steel, simultaneously because each specific gas supply element 2 outlet rare gas element speed is very little, only produce a large amount of micro-bubble groups, a little less than stirring to molten steel, slag interface is very steady, molten steel is very little at slag surface exposure, thereby molten steel temperature drop is also very little.
Claims (5)
1. the quick removal device of inclusion content in melting steel, is characterized in that: comprising: contain steel in water container (1), specific gas supply element (2), protect brick (6), bottom blown gas regulation system (7); Containing steel in water container (1) bottom installation specific gas supply element (2), by bottom blowing rare gas element, in processed molten steel (3), produce large-scale fine bubble (4) rising area, by being distributed in a large number farthest capture clip foreign material of micro-bubble in molten steel, promote it to float in top slag (5) and be removed and purify hot metal; Specific gas supply element (2) periphery is provided with protects brick (6), and bottom blown gas regulation system (7) is connected with specific gas supply element (2) by pipeline (13), controls Bottom Blowing Gas Flow Rate size.
Described specific gas supply element (2) top is that refractory materials (10) is covered with straight-through or crooked micropore (11), micropore (11) spacing 5-30mm internal diameter 0.5-1.5mm; Bottom is that air chamber (12) distributes each micropore (11) air inlet, and air chamber is connected with inlet pipe (13).
2. device as claimed in claim 1, is characterized in that: described specific gas supply element (2) is arranged on contains steel in water container (1) bottom, and avoids mouth of a river district (8) and molten steel impact zone (9).
3. device as claimed in claim 1 or 2, is characterized in that: when specific gas supply element (2) is installed, by containing steel in water container (1) lateral pre-installation, have the bottom of protecting brick (6) to insert specific gas supply element (2); Bottom specific gas supply element (2) diameter is 30-300mm, and specific gas supply element (2) number is 3-24, and limit portion spacing is greater than 100mm.
4. device as claimed in claim 1, is characterized in that: described refractory materials (10) is magnesium carbonaceous, corundum or magnesium chromium.
5. the method that an inclusion content in melting steel is removed fast, it is characterized in that: in Sheng steel in water container (1) bottom, avoid mouth of a river district (8) and molten steel impact zone (9) a plurality of specific gas supply elements (2) that can produce a large amount of micro-bubbles are installed, by bottom blowing rare gas element, in processed molten steel (3), produce large-scale fine bubble (4) rising area, by being distributed in a large number farthest capture clip foreign material of micro-bubble in molten steel, promote it to float in top slag (5) and be removed and purify hot metal; Bottom blowing rare gas element total gas flow rate is molten steel 0.001-0.03m per ton
3/ min, each specific gas supply element bottom blowing flow adopts alone or in combination to be controlled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310507231.7A CN103555889B (en) | 2013-10-24 | 2013-10-24 | Device and method for quickly removing occluded foreign substances in molten steel |
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| CN201310507231.7A CN103555889B (en) | 2013-10-24 | 2013-10-24 | Device and method for quickly removing occluded foreign substances in molten steel |
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| CN103555889A true CN103555889A (en) | 2014-02-05 |
| CN103555889B CN103555889B (en) | 2015-05-27 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234217A (en) * | 2017-07-14 | 2017-10-10 | 山东钢铁股份有限公司 | A kind of ar blowing refining method for being used to produce SPHC steel grades |
| CN106180597B (en) * | 2016-08-31 | 2018-03-09 | 山东钢铁股份有限公司 | A kind of device and method that magnesium processing is carried out in tundish |
| CN108396109A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Method for generating dispersed bubbles in molten steel in steel ladle |
| CN109694933A (en) * | 2019-03-08 | 2019-04-30 | 东北大学 | A kind of electric-arc furnace steelmaking device and method of bottom blowing powder injection |
| CN109868341A (en) * | 2019-03-08 | 2019-06-11 | 东北大学 | A kind of device and method of full bottom-blown ladle refining liquid steel |
| CN110484690A (en) * | 2019-09-16 | 2019-11-22 | 安徽应流铸业有限公司 | A kind of quick deslagging device of molten steel and its deslagging method |
| CN111172354A (en) * | 2020-02-28 | 2020-05-19 | 鞍钢股份有限公司 | Microbubble molten steel purification device and purification method |
| CN117862430A (en) * | 2023-12-22 | 2024-04-12 | 鞍钢股份有限公司 | Device and method for removing inclusions in molten steel in tundish |
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|---|---|---|---|---|
| CN1054558A (en) * | 1990-12-07 | 1991-09-18 | 李恩惠 | Forming technology for multi-hole straight gas fireproof products |
| CN101824510A (en) * | 2010-05-14 | 2010-09-08 | 东北大学 | Argon blowing method at bottom of steel ladle for continuously casting steel |
| CN201922035U (en) * | 2011-01-25 | 2011-08-10 | 濮阳濮耐高温材料（集团）股份有限公司 | Air blowing brick |
| CN202808864U (en) * | 2012-09-10 | 2013-03-20 | 唐山港陆钢铁有限公司 | Furnace-rear steel ladle argon blowing device |
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2013
- 2013-10-24 CN CN201310507231.7A patent/CN103555889B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1054558A (en) * | 1990-12-07 | 1991-09-18 | 李恩惠 | Forming technology for multi-hole straight gas fireproof products |
| CN101824510A (en) * | 2010-05-14 | 2010-09-08 | 东北大学 | Argon blowing method at bottom of steel ladle for continuously casting steel |
| CN201922035U (en) * | 2011-01-25 | 2011-08-10 | 濮阳濮耐高温材料（集团）股份有限公司 | Air blowing brick |
| CN202808864U (en) * | 2012-09-10 | 2013-03-20 | 唐山港陆钢铁有限公司 | Furnace-rear steel ladle argon blowing device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106180597B (en) * | 2016-08-31 | 2018-03-09 | 山东钢铁股份有限公司 | A kind of device and method that magnesium processing is carried out in tundish |
| CN108396109A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Method for generating dispersed bubbles in molten steel in steel ladle |
| CN107234217A (en) * | 2017-07-14 | 2017-10-10 | 山东钢铁股份有限公司 | A kind of ar blowing refining method for being used to produce SPHC steel grades |
| CN109694933A (en) * | 2019-03-08 | 2019-04-30 | 东北大学 | A kind of electric-arc furnace steelmaking device and method of bottom blowing powder injection |
| CN109868341A (en) * | 2019-03-08 | 2019-06-11 | 东北大学 | A kind of device and method of full bottom-blown ladle refining liquid steel |
| CN110484690A (en) * | 2019-09-16 | 2019-11-22 | 安徽应流铸业有限公司 | A kind of quick deslagging device of molten steel and its deslagging method |
| CN111172354A (en) * | 2020-02-28 | 2020-05-19 | 鞍钢股份有限公司 | Microbubble molten steel purification device and purification method |
| CN111172354B (en) * | 2020-02-28 | 2021-11-12 | 鞍钢股份有限公司 | Microbubble molten steel purification device and purification method |
| CN117862430A (en) * | 2023-12-22 | 2024-04-12 | 鞍钢股份有限公司 | Device and method for removing inclusions in molten steel in tundish |
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| CN103555889B (en) | 2015-05-27 |
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