CN104404204A - Method for controlling splashing of molten iron desulphurization - Google Patents
Method for controlling splashing of molten iron desulphurization Download PDFInfo
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- CN104404204A CN104404204A CN201410727956.1A CN201410727956A CN104404204A CN 104404204 A CN104404204 A CN 104404204A CN 201410727956 A CN201410727956 A CN 201410727956A CN 104404204 A CN104404204 A CN 104404204A
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Abstract
The invention discloses a method for controlling splashing of molten iron desulphurization. The method comprises the steps: putting a nitrogen spraying gun into a molten iron tank, wherein allowing the nitrogen spraying gun to blow blowing-assistant nitrogen according to the flow of 40-50Nm<3>/h; in an assistant nitrogen blowing process, adding magnesium bars according to 5-6.5kg/min by arranging a material feeding channel on the molten iron tank, stopping adding the magnesium bars after the assistant nitrogen blowing is ended, and then blowing the blowing-assistant nitrogen according to the flow of 70Nm<3>/h for 2min. The method is obvious in molten iron desulphurization control effect; normal operation of desulphurization equipment can be guaranteed; the fault rate of the desulphurization equipment is obviously reduced; the cleaning frequency and the cleaning difficulty of a tank truck are effectively reduced; the slag cleaning amount of a molten iron tank truck is reduced from 360t to 180t every month, so that the manpower is greatly saved and the cost is greatly reduced, and conditions are created for stable production. After improvement, the splashing iron loss is reduced by 1.21kg/t; furthermore, the desulfurizing agent utilization rate is improved from 46.68 percent before adjustment to 46.96 percent at present.
Description
Technical field
The present invention relates to and be applied to ferrous metallurgy iron water-magnesium desulfurization pre-treatment production field, refer to that a kind of desulfurizing iron controls the method for splash particularly.
Background technology
Desulfurizing iron is the important procedure of STEELMAKING PRODUCTION, and Wuhan Iron and Steel Plant one has been made steel since the whole nation takes the lead in introducing desulphurization of passive molten magnesium and iron technology, and because it has, cost is low, the desulfurization cycle is short, desulfuration efficiency advantages of higher, achieves very fast development.In recent years, converter capacity constantly increases, and molten iron Intake Quantity progressively improves, and in molten iron magnesium sweetening process, splash is more serious, its splash Producing reason is: blowing desulfurization is jetted in iron ladle by spray gun by passivated magnesium, carrier gas flux is larger, and kinetic energy transmission is stronger, and the liquid molten iron in iron ladle stirs stronger, add that iron ladle top freeboard reduces to 300cm by original 600cm, now, molten iron is suitable for reading with the dispersion state iron ladle that flies out, and namely forms splash.
There is following harm in molten iron splash:
1) cause Regional Environmental Pollution, and steel technology also slightly increases;
2) cause hot-metal ladle and carriage to increase weight, add cleaning difficulty and frequency, labour intensity is large.
3) splash easily makes dust excluding hood dry slag dross, produces potential safety hazard.Splashing molten iron is also very easily burnt people and equipment.
For above-mentioned three problems, a steelworks on the basis analyzing molten iron splash reason, in conjunction with the demand of actual production, propose when not increasing input in addition, adopt low flow passivated magnesium blowing desulfurization control techniques, adjustment desulfuration injection parameter, controls the problem of desulphurised hot metal splash.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of method that desulfurizing iron controls splash, guarantees the desulfuration efficiency of low flow winding-up passivated magnesium, eliminates the harm existed in molten iron splash process.
The theoretical basis of conventional molten iron splash process:
Hydraulic model test shows: Mg desulfurization is a violent exothermal reaction process, in reduction under the condition of magnesium amount, can reduce splash.But from actual production angle, reduce the prolongation just meaning the desulfurization process time to magnesium amount, cannot match with the rhythm of production of reality.And by reducing winding-up flow, the kinetic energy transmission of liquid certainly will be reduced, weaken the molten iron agitation energy in iron ladle, splash can be reduced, meeting the cycle match of actual production.But be unfavorable for the mixing of sweetening agent.From another perspective, when reducing winding-up flow, as long as spray gun inserts enough dark, also can obtain and jet flow greatly, mixing time equivalent when rifle position is more shallow, does not change sweetening effectiveness.Because the increase of iron water amount, the distance bottom spray gun bottom iron ladle does not change, the actual depth of penetration relatively adding spray gun, now suitably reduces winding-up flow and can not reduce sweetening effectiveness, but can reduce desulfurization splash.If but nitrogen flow is too small, one does not have the effect of winding-up, and winding-up vaporizer also may be caused to enter iron, and blocking winding-up tubule, very easily causes large splash, larger to production interference.
For solving the problems of the technologies described above, a kind of desulfurizing iron provided by the invention controls the method for splash, and the method stretches in iron ladle by nitrogen gun, and nitrogen gun is by 40 ~ 50Nm
3the flow winding-up of/h helps nitrogen blowing, is helping in nitrogen blowing process, by being arranged on the loading channel on iron ladle, adding magnesium rod, help nitrogen blowing to terminate rear stopping and adding magnesium rod, then press 70Nm by 5 ~ 6.5kg/min
3the flow winding-up of/h helps nitrogen blowing 2min.
Further, in described control splash process, splash iron is 2.15 ~ 3.54kg/t.
A step ground again, in described control splash process, reactive desulfurizing agent rate is 46.55 ~ 46.68%.
A step ground again, in described control splash process, when nitrogen gun presses 45Nm
3during/h, splash iron is 2.33kg/t, and reactive desulfurizing agent rate is 46.96%.
Beneficial effect of the present invention is:
Through nearly bimestrial test, by observing the spraying state of molten iron, contrasting the changes in weight of iron ladle and hot-metal ladle and carriage winding-up front and back, analyze the change of sweetening effectiveness and desulfurization splash volume under different injection parameter, confirm that this kind of winding-up control techniques is obvious to control desulfurizing iron splashing effect, can guarantee the normal operation of sweetener, sweetener failure rate obviously declines.Effectively reduce tank car cleaning frequency and difficulty simultaneously, clear up weekly once before injection parameter adjustment, after injection parameter adjustment, cleaning in every two weeks once, and monthly the hot-metal ladle and carriage cleaning quantity of slag drops to present 180t by original 360t, save a large amount of human costs, for stably manufactured creates condition.After improvement, decrease splash iron loss 1.21kg/t, and sorbent utilization brings up to present 46.96% by 46.68% before adjusting.
Embodiment
In order to explain the present invention better, illustrate main contents of the present invention further below in conjunction with specific embodiment, but content of the present invention is not only confined to following examples.
1) according to above principle, guaranteeing, under the prerequisite that winding-up kinetics flow field is unimpeded, to have carried out the existing desulfurization production operation process of manual winding-up simulation: according to molten iron temperature condition, suitably reduced to help and blows N
2flow, determines suitable winding-up flow parameter, to reduce the molten iron splash of winding-up process.By observing the changes in weight before and after the spraying state of molten iron, contrast iron ladle and hot-metal ladle and carriage winding-up, analyze the change of desulfurization splash volume under different injection parameter.
Be 1200 ~ 1300 DEG C at molten iron temperature, when average molten iron Intake Quantity is 114t, the situation that splash iron loss changes with injection parameter is shown in table 1:
In table 1. sweetening process, splash iron loss is with the change of injection parameter
| Flow, Nm 3/h | 40 | 43 | 45 | 48 | 50 (before adjustment) |
| Splash iron, kg/t | 2.15 | 2.25 | 2.33 | 3.12 | 3.54 |
As can be seen from Table 1, splash iron loss reduces with winding-up flow and reduces.
2) by analyzing desulfurization production data, more different injection parameter is on the impact of sweetening effectiveness.
Be 1200 ~ 1300 DEG C at molten iron temperature, when average molten iron Intake Quantity is 114t, the situation that sweetening effectiveness changes with injection parameter is shown in table 2:
In table 2. sweetening process, sweetening effectiveness is with the change of injection parameter
| Flow, Nm 3/h | 40 | 43 | 45 | 48 | 50 (before adjustment) |
| Sulphur before average, % | 0.0299 | 0.0295 | 0.0299 | 0.0298 | 0.0298 |
| Sulphur after average, % | 0.0062 | 0.0063 | 0.0065 | 0.0063 | 0.0065 |
| Reactive desulfurizing agent rate, % | 46.55 | 46.72 | 46.96 | 46.75 | 46.68 |
As can be seen from Table 2, the injection parameter after adjustment can not reduce the effective rate of utilization of sweetening agent, can meet need of production preferably.
Other unspecified part is prior art.Although above-described embodiment is to invention has been detailed description; but it is only the present invention's part embodiment; instead of whole embodiment, people can also obtain other embodiments according to the present embodiment under without creative prerequisite, and these embodiments all belong to scope.
Claims (4)
1. desulfurizing iron controls a method for splash, it is characterized in that: the method stretches in iron ladle by nitrogen gun, and nitrogen gun is by 40 ~ 48Nm
3the flow winding-up of/h helps nitrogen blowing, is helping in nitrogen blowing process, by being arranged on the loading channel on iron ladle, adding magnesium rod, help nitrogen blowing to terminate rear stopping and adding magnesium rod, then press 70Nm by 5 ~ 6.0kg/min
3the flow winding-up of/h helps nitrogen blowing 2min.
2. control the method for splash according to claim 1 desulfurizing iron, it is characterized in that: in described control splash process, splash iron is 2.15 ~ 3.12kg/t.
3. control the method for splash according to claim 1 or 2 desulfurizing iron, it is characterized in that: in described control splash process, reactive desulfurizing agent rate is 46.55 ~ 46.96%.
4. control the method for splash according to claim 1 or 2 desulfurizing iron, it is characterized in that: in described control splash process, when nitrogen gun presses 45Nm
3during/h, splash iron is 2.33kg/t, and reactive desulfurizing agent rate is 46.96%.
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| CN104404204B CN104404204B (en) | 2016-06-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107828931A (en) * | 2017-11-02 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of blowing process molten iron pre-desulfurization technique for not having to fluidization lime and passivated magnesium |
| CN109338038A (en) * | 2018-11-30 | 2019-02-15 | 鞍钢集团工程技术有限公司 | A method of reducing KR splash |
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| CN101397600A (en) * | 2008-11-11 | 2009-04-01 | 武汉钢铁(集团)公司 | Method for desulphurization of passive molten magnesium and iron |
| CN102618697A (en) * | 2011-01-28 | 2012-08-01 | 宝山钢铁股份有限公司 | Magnesium-based desulphuration method of molten iron outside furnace |
| CN102912084A (en) * | 2012-11-07 | 2013-02-06 | 武汉钢铁(集团)公司 | Molten iron desulfurization method |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101397600A (en) * | 2008-11-11 | 2009-04-01 | 武汉钢铁(集团)公司 | Method for desulphurization of passive molten magnesium and iron |
| CN102618697A (en) * | 2011-01-28 | 2012-08-01 | 宝山钢铁股份有限公司 | Magnesium-based desulphuration method of molten iron outside furnace |
| CN102912084A (en) * | 2012-11-07 | 2013-02-06 | 武汉钢铁(集团)公司 | Molten iron desulfurization method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107828931A (en) * | 2017-11-02 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of blowing process molten iron pre-desulfurization technique for not having to fluidization lime and passivated magnesium |
| CN109338038A (en) * | 2018-11-30 | 2019-02-15 | 鞍钢集团工程技术有限公司 | A method of reducing KR splash |
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| CN104404204B (en) | 2016-06-15 |
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Effective date of registration: 20170726 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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