CN204265815U - Mineral hot furnace and AOD furnace duplex practice stainless steel production system - Google Patents
Mineral hot furnace and AOD furnace duplex practice stainless steel production system Download PDFInfo
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- CN204265815U CN204265815U CN201420687266.3U CN201420687266U CN204265815U CN 204265815 U CN204265815 U CN 204265815U CN 201420687266 U CN201420687266 U CN 201420687266U CN 204265815 U CN204265815 U CN 204265815U
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Abstract
The utility model is applicable to steelmaking technical field, there is provided a kind of mineral hot furnace and AOD furnace duplex practice stainless steel production system, described technique comprises the rotary kiln, mineral hot furnace, hot metal mixer, acid lining AOD furnace, basic lining AOD furnace, refining furnace, the stainless steel plate billet continuous casting machine that connect in turn.The utility model, by arranging hot metal mixer, by the ferronickel water of mine heat furnace smelting after hot metal mixer buffering, is directly blended into AOD furnace, saves furnace melting alloy prior, make full use of ferronickel water latent heat, can reduce whole stainless steel-making process system energy consumption.
Description
Technical field
The utility model belongs to steelmaking technical field, particularly relates to a kind of mineral hot furnace and AOD furnace duplex practice stainless steel production system.
Background technology
The existing centenary history nearly of stainless utility model, stainless steel has stainless, corrosion-resistant, high life, the feature such as recyclable, attractive in appearance and be widely used in the every field of national economy because of it.During stainless steel smelting is produced, particularly 200 series and 300 series, metallic nickel is the alloy that must add, and conversion can account for 30% of stainless steel production cost.In recent years, along with pure nickel price rises gradually, in order to reduce production cost, domestic a lot of stainless steel producer uses Rhometal to add in molten steel as the substitute of pure nickel gradually.Along with the expansion at full speed of stainless steel production capacity, there is the situation that supply exceed demand in stainless steel product.How to reduce stainless production cost, improve the competitiveness of product in market and become the enterprises of producing stainless steel task of top priority.
Utility model content
In view of the above problems, the purpose of this utility model is to provide a kind of mineral hot furnace and AOD furnace duplex practice stainless steel production system, is intended to solve the higher technical problem of existing stainless steel production technique cost.
Described mineral hot furnace and AOD furnace duplex practice stainless steel production system, comprising:
Rotary kiln, for coordinating coke to carry out drying and dehydrating and pre-reduction treatment in the Wingdale after being mixed in proportion and red soil nickel ore, obtains agglomerate;
Mineral hot furnace, for allocating coke and quickened lime into described agglomerate, energising is smelted and is produced ferronickel water;
Hot metal mixer, cushions for described ferronickel water, to make mineral hot furnace and AOD furnace smelting cycle coupling;
Acid lining AOD furnace, for adding ferrochrome to the ferronickel water in hot metal mixer and carrying out oxygen blast desiliconization and decarburizing reaction;
Basic lining AOD furnace, for adding ferrochrome and steel scrap to the molten steel smelted through described acid lining AOD furnace, carries out oxygen blast dephosphorization and decarburizing reaction;
Refining furnace, for the further refining of molten steel of smelting through described basic lining AOD furnace, makes molten steel cost meet continuous casting requirement;
Stainless steel plate billet continuous casting machine, for carrying out continuous casting production to the molten steel obtained through refining, obtains stainless steel base substrate;
Described rotary kiln, mineral hot furnace, hot metal mixer, acid lining AOD furnace, basic lining AOD furnace, refining furnace, stainless steel plate billet continuous casting machine connect in turn.
Further, described refining furnace comprises LF refining furnace and VOD refining furnace.
Further, described mineral hot furnace has four, each one of described acid lining AOD furnace, basic lining AOD furnace.
Further, in described acid lining AOD furnace, basic lining AOD furnace, be equipped with gasification refrigerating mechanism, in order to be reclaimed as a vapor by the waste gas produced in AOD furnace smelting process; The flue gas that described mine heat furnace smelting produces sends into rotary kiln, to reduce smelting in rotary kiln energy consumption after reclaiming.
The beneficial effects of the utility model are: the utility model is by arranging hot metal mixer, by the ferronickel water of mine heat furnace smelting after hot metal mixer buffering, be directly blended into AOD furnace, save furnace melting alloy prior, making full use of ferronickel water latent heat, can be that whole stainless steel-making process reduces by 10% energy consumption.In addition, in optimal way, adopt the ferronickel water that AOD duplex practice process mineral hot furnace is produced, decarburization, desiliconization task are placed in acid lining AOD furnace and carry out, the task of dephosphorization, decarburization is placed in basic lining AOD furnace carries out, solve AOD furnace can not simultaneously desiliconization, dephosphorization and decarburization process difficulties.In addition, the flue gas that mineral hot furnace produces, through recycling, is sent into rotary kiln, can be reduced the energy consumption of rotary kiln sintered technique; AOD furnace arranges gasification refrigerating mechanism, reclaims AOD furnace and smelts waste heat, for warm-up power generation, the whole audience for warm VOD vacuum pump gas, can reduce energy consumption further.In a word, the utility model will by arranging hot metal mixer, mineral hot furnace technique and AOD technique are combined, enterprises of producing stainless steel electric furnace construction cost and smelting cost can be saved, integrated artistic is than traditional stainless steel-making process saving energy 30%, and consumption reduction has a high potential, remarkable in economical benefits, organization of production is flexible, is a kind of brand-new stainless steel-making process.
Accompanying drawing explanation
Fig. 1 is the schema of the mineral hot furnace that provides of the utility model embodiment and AOD furnace duplex practice stainless steel production technique;
Fig. 2 is the production line structure iron of the stainless steel production system that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In order to technical scheme described in the utility model is described, be described below by specific embodiment.
Fig. 1 shows the flow process of mineral hot furnace that the utility model embodiment provides and AOD furnace duplex practice stainless steel production technique, Fig. 2 shows the structure of the stainless steel production system that the utility model embodiment provides, and illustrate only the part relevant to the utility model embodiment for convenience of explanation.
See figures.1.and.2, below to smelt the embodiment that this technique set forth by 304L stainless steel.The mineral hot furnace that the present embodiment provides and AOD furnace duplex practice stainless steel production technique comprise the steps:
Step S101, red soil nickel ore sintering step.
First choose Wingdale and then red soil nickel ore mixes in mass ratio, such as blending ratio is about 1:10, wherein in red soil nickel ore containing Ni:1.5% ~ 3.0%, Fe:15 ~ 18%, moisture :≤11% (be mass percent, lower with); And then allocate coke into, add rotary kiln, carry out drying and dehydrating and pre-reduction treatment in rotary kiln after, obtain agglomerate, and described agglomerate heat is delivered to mineral hot furnace.
Step S102, mine heat furnace smelting nickel-iron water step.
In mineral hot furnace, allocate coke and quickened lime into, energising is smelted and is produced ferronickel water.This step adopts 50MVA mineral hot furnace, smelting cycle is about 120min, go out iron 15t at every turn, smelt each constituent content in the ferronickel water obtained following (mass percent) Ni:12% ~ 15%, Si:2 ~ 4%, P:0.40 ~ 0.55%, C:3.0 ~ 4.0%, S:0.04 ~ 0.1%, ferronickel water temp is 1500 DEG C.Preferably, the flue gas that mine heat furnace smelting produces, temperature is about 400 DEG C, CO content is about 70%, can send into rotary kiln, reducing smelting in rotary kiln energy consumption through reclaiming.
Step S103, hot metal mixer buffer step.
The ferronickel water obtained by step S102 sends into hot metal mixer buffering, and the mine heat furnace smelting cycle is about 120mim, and AOD furnace smelting cycle is about 70min, can make mineral hot furnace and AOD furnace smelting cycle coupling by arranging hot metal mixer.Here hot metal mixer plays shock absorption, for being connected mineral hot furnace technique and acid lining AOD furnace technique, is namely connected mineral hot furnace and acid lining AOD furnace.
Step S104, acid lining AOD furnace smelting step.
This step adopts 60t acid lining AOD furnace.Concrete, the ferronickel water in described hot metal mixer is sent in the AOD furnace adopting acid lining, add ferrochrome and carry out oxygen blast desiliconization and decarburizing reaction.The pan feeding proportioning of acid lining AOD furnace is: 60% other alloys of ferronickel water+35% high carbon ferro-chrome+5% (quality proportioning).Concrete, ferrochrome divides and adds for 2 times in ferronickel water, then adopts the technological operation of decarburization after first desiliconization, utilizes the heat melts ferrochrome of silicon and carbon burning release, adopt the mode of BOTTOM ARGON BLOWING to reduce CO dividing potential drop and realize decarburization and cr yield during AOD furnace decarburization.AOD furnace top rifle blowing oxygen quantity: 3000 ~ 4500Nm
3/ h, furnace bottom Argon tolerance: 3000 ~ 4500Nm
3/ h.Decarburization terminates rear slag making desulfurization.Acid lining AOD furnace tap to tap time is 70min, therefore will arrange 4 50MVA mineral hot furnaces and AOD furnace is coordinated production.Acid lining AOD furnace is smelted in the molten steel, and C content is 1% ~ 1.5%, Si content is 1%, and tapping temperature is 1640 DEG C ~ 1670 DEG C.
Step S105, basic lining AOD furnace smelting step.
This step adopts 60t basic lining AOD.Concrete, the molten steel smelted through described acid lining AOD furnace is sent into and adopts in basic-lined AOD furnace, and add ferrochrome and steel scrap, carry out oxygen blast dephosphorization and decarburizing reaction.The smelting cycle also about 70min of basic lining AOD furnace.Basic lining AOD furnace enters stove charge composition for other alloy+10% steel scraps of the molten steel+10% that 80% acid lining AOD furnace goes out (ordinary scrap steel and stainless steel steel scrap).Smelt and start, carry out oxygen decarburization to molten steel, decarburization mode and acid lining AOD furnace are similar, employing top and bottom complex blowing form.AOD pushes up rifle blowing oxygen quantity: 3000 ~ 4500m
3/ h, BOTTOM ARGON BLOWING tolerance: 3000 ~ 4500m
3/ h.When carbon content in molten steel be reduced to ~ 0.25% time, stop oxygen decarburization, slag making dephosphorization.Basic lining AOD furnace goes out in molten steel, C content about 0.25%, P about 0.06%, and other compositions reach smelting requirements, and tapping temperature is 1650 DEG C ~ 1680 DEG C.
Step S106, LF refinement step.
The molten steel smelted through described basic lining AOD furnace is sent into refining in LF stove, realizes desulfurization and adjust liquid steel temperature and alloying constituent.The main task of LF stove refining is adjustment molten steel composition, temperature and desulfurization.Rear molten steel sulphur content≤0.06% smelted by LF stove, tapping temperature 1540 DEG C ~ 1560 DEG C.
Step S107, VOD refinement step.
Molten steel through the refining of described LF stove is sent into refining in VOD stove, carries out dark carbonization treatment.304L stainless steel belongs to Ultralow Carbon Stainless Steel, aim carbon content≤0.03%, needs to carry out the decarburization of VOD vacuum treatment deep to molten steel.VOD vacuum refinement process is divided into 3 stages: 1) oxygen blast carbon elimination, 2) seethe with excitement and degas and 3) reduction fine setting.After molten steel is ready to, opens vacuum pump, rapidly system pressure is evacuated to 8Kpa, start oxygen decarburization, oxygen blow duration ~ 30min, blowing oxygen quantity: 2000 ~ 2500Nm
3/ h; After oxygen blast terminates, rapidly system pressure is evacuated to 67Pa and carries out high vacuum degassing, degassing time ~ 12min.VOD process whole process is adopted argon bottom-blowing and is stirred, argon pressure 0.6 ~ 0.8Mpa, flow 60 ~ 360Nl/min.VOD vacuum processing time ~ 60min, carbon content of molten steel≤0.03% after process.
Step S108, continuous casting step.
Molten steel refining obtained is sent in stainless steel plate billet continuous casting machine and is carried out continuous casting production, obtains stainless steel base substrate.This step adopts a series of technology such as protective casting, M-EMS, dynamic soft-reduction to improve stainless steel slab quality.
As preferred embodiment, in described acid lining AOD furnace, basic lining AOD furnace, be equipped with gasification refrigerating mechanism, in order to the waste gas produced in AOD furnace smelting process is reclaimed as a vapor, may be used for generating, factory building for the vacuum pump gas etc. of warm VOD refining furnace, play the effect reducing and smelt energy consumption.
In addition, the present embodiment also provides a kind of stainless steel production system, and with above-mentioned production technique to corresponding, the stainless steel production system that the present embodiment provides comprises:
Rotary kiln 1, for coordinating coke to carry out drying and dehydrating and pre-reduction treatment in the Wingdale after being mixed in proportion and red soil nickel ore, obtains agglomerate;
Mineral hot furnace 2, for allocating coke and quickened lime into described agglomerate, energising is smelted and is produced ferronickel water;
Hot metal mixer 3, cushions for described ferronickel water, to make mineral hot furnace and AOD furnace smelting cycle coupling;
Acid lining AOD furnace 4, for adding ferrochrome to the ferronickel water in hot metal mixer and carrying out oxygen blast desiliconization and decarburizing reaction;
Basic lining AOD furnace 5, for adding ferrochrome and steel scrap to the molten steel smelted through described acid lining AOD furnace, carries out oxygen blast dephosphorization and decarburizing reaction;
Refining furnace, for the further refining of molten steel of smelting through described basic lining AOD furnace, makes molten steel cost meet continuous casting requirement; Described refining furnace comprises LF refining furnace 61 and VOD refining furnace 62.
Stainless steel plate billet continuous casting machine 7, for carrying out continuous casting production to the molten steel obtained through refining, obtains stainless steel base substrate;
Described rotary kiln 1, mineral hot furnace 2, hot metal mixer 3, acid lining AOD furnace 4, basic lining AOD furnace 5, LF refining furnace 61, VOD refining furnace 62, stainless steel plate billet continuous casting machine 7 connect in turn.
To sum up, the utility model is by arranging hot metal mixer, and the ferronickel water of mine heat furnace smelting, after hot metal mixer buffering, is directly blended into AOD furnace, saves furnace melting alloy prior, make full use of ferronickel water latent heat, can be that whole stainless steel-making process reduces about 10% energy consumption; In addition, adopt the ferronickel water that AOD duplex practice process mineral hot furnace is produced, decarburization, desiliconization task are placed in acid AOD furnace and are carried out, the task of dephosphorization, decarburization is placed in basic lining AOD furnace carries out, success solve AOD furnace can not desiliconization simultaneously, dephosphorization and decarburization process difficulties; And 2 AOD furnace all adopt same design except liner, Maintenance and Repair are convenient; 3rd, the flue gas that mineral hot furnace produces is through recycling, send into rotary kiln, the energy consumption of rotary kiln sintered technique can be reduced, and in AOD furnace, gasification refrigerating mechanism is set, smelt waste heat to reclaim AOD furnace, for warm-up power generation, the whole audience for the vacuum pump gas in warm VOD refining furnace, can reduce and smelt energy consumption about 12%; Finally, the utility model has fairly perfect secondary refining process, is equipped with LF refining furnace and the refining of VOD stove, can produces the stainless steel product of high kind, improves product competitiveness in the market.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. mineral hot furnace and an AOD furnace duplex practice stainless steel production system, it is characterized in that, described system comprises:
Rotary kiln, for coordinating coke to carry out drying and dehydrating and pre-reduction treatment in the Wingdale after being mixed in proportion and red soil nickel ore, obtains agglomerate;
Mineral hot furnace, for allocating coke and quickened lime into described agglomerate, energising is smelted and is produced ferronickel water;
Hot metal mixer, cushions for described ferronickel water, to make mineral hot furnace and AOD furnace smelting cycle coupling;
Acid lining AOD furnace, for adding ferrochrome to the ferronickel water in hot metal mixer and carrying out oxygen blast desiliconization and decarburizing reaction;
Basic lining AOD furnace, for adding ferrochrome and steel scrap to the molten steel smelted through described acid lining AOD furnace, carries out oxygen blast dephosphorization and decarburizing reaction;
Refining furnace, for the further refining of molten steel of smelting through described basic lining AOD furnace, makes molten steel cost meet continuous casting requirement;
Stainless steel plate billet continuous casting machine, for carrying out continuous casting production to the molten steel obtained through refining, obtains stainless steel base substrate;
Described rotary kiln, mineral hot furnace, hot metal mixer, acid lining AOD furnace, basic lining AOD furnace, refining furnace, stainless steel plate billet continuous casting machine connect in turn.
2. mineral hot furnace and AOD furnace duplex practice stainless steel production system as claimed in claim 1, it is characterized in that, described refining furnace comprises LF refining furnace and VOD refining furnace.
3. mineral hot furnace and AOD furnace duplex practice stainless steel production system as claimed in claim 2, it is characterized in that, described mineral hot furnace has four, each one of described acid lining AOD furnace, basic lining AOD furnace.
4. mineral hot furnace and AOD furnace duplex practice stainless steel production system as claimed in claim 3, it is characterized in that, in described acid lining AOD furnace, basic lining AOD furnace, be equipped with gasification refrigerating mechanism, in order to be reclaimed as a vapor by the waste gas produced in AOD furnace smelting process; The flue gas that described mine heat furnace smelting produces sends into rotary kiln after reclaiming.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313309A (en) * | 2014-11-17 | 2015-01-28 | 中冶南方工程技术有限公司 | Technology and system for producing stainless steel by submerged arc furnace and AOD furnace duplex process |
| CN108118113A (en) * | 2017-12-24 | 2018-06-05 | 单士营 | A kind of smelting process of stainless steel material |
| CN109750137A (en) * | 2019-01-15 | 2019-05-14 | 明拓集团铬业科技有限公司 | A kind of direct heat of high carbon chromium molten iron converts the manufacturing method of production stainless steel |
| CN114875301A (en) * | 2022-05-07 | 2022-08-09 | 山西太钢不锈钢股份有限公司 | Chromium-based stainless steel and preparation method thereof |
-
2014
- 2014-11-17 CN CN201420687266.3U patent/CN204265815U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313309A (en) * | 2014-11-17 | 2015-01-28 | 中冶南方工程技术有限公司 | Technology and system for producing stainless steel by submerged arc furnace and AOD furnace duplex process |
| CN108118113A (en) * | 2017-12-24 | 2018-06-05 | 单士营 | A kind of smelting process of stainless steel material |
| CN109750137A (en) * | 2019-01-15 | 2019-05-14 | 明拓集团铬业科技有限公司 | A kind of direct heat of high carbon chromium molten iron converts the manufacturing method of production stainless steel |
| CN114875301A (en) * | 2022-05-07 | 2022-08-09 | 山西太钢不锈钢股份有限公司 | Chromium-based stainless steel and preparation method thereof |
| CN114875301B (en) * | 2022-05-07 | 2023-08-11 | 山西太钢不锈钢股份有限公司 | Chromium stainless steel and preparation method thereof |
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