CN101532073A - A desulfurizing process - Google Patents
A desulfurizing process Download PDFInfo
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- CN101532073A CN101532073A CN200910301546A CN200910301546A CN101532073A CN 101532073 A CN101532073 A CN 101532073A CN 200910301546 A CN200910301546 A CN 200910301546A CN 200910301546 A CN200910301546 A CN 200910301546A CN 101532073 A CN101532073 A CN 101532073A
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- sweetening agent
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- molten iron
- desulfurization
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Abstract
The invention relates to a desulfurization process, pertaining to the field of steel-smelting desulfurization technology. The technical problems the invention object to resolve is to provide a new desulfurizing agent to overcome the defect of bad desulfurization effects of the prior process. The inventive desulfurizing process includes: in the furnace tapping process, adding 55-65% of desulfurizing agent in the iron melt groove, after the tapping of the iron melt, in the desulfuration platform, mixing in the iron melt tank and adding 35-45% of the desulfurization agent. The inventive desulfurizing process can resolve the problem of ultrahigh sulfur content in the cast iron, wherein, the maximum desulfurization efficiency is 98%.
Description
Technical field
The present invention relates to a kind of sulfur removal technology, belong to the steel desulfurization technical field.
Background technology
The novel process that coal-based direct reduction method flow process is short, pollution-free, meet the recycling economy pattern is behind blast furnace process, natural gas act, the state-of-the art smelting technology in the world today.Sichuan Lomon Mining ﹠ Metallurgy Co., Ltd adopts this technology year to handle 70,000 tons of sefstromite concentrates, produces 60000 tons of sefstromite concentrate direct-reduced irons, 1.63 ten thousand tons of rich titanium slags, 1500 tons of vanadium slags, 40,000 tons of byproduct irons per year.Because the original sulphur of red lattice vanadium titano-magnetite higher (the sulphur massfraction is 0.27% before on average taking off), the said firm adopts blowing desulfurization, in the winding-up process, use mixing air as blowing gas, cause in the winding-up process splash big and desulfuration efficiency is not high, since being constructed and put into operation from the said firm, taken off back sulphur and never be lower than 0.045%.
For solving the problem of desulfurization, the present inventor has introduced the desulfurization of KR method for Sichuan Lomon Mining ﹠ Metallurgy Co., Ltd.Because all there is hot metal mixer on a large scale ironworks, after molten iron flows out from blast furnace, enter in the hot metal mixer and be incubated, from hot metal mixer, directly pour molten iron into iron ladle then.The desulfurization of KR method is that the agitator that refractory materials is made is inserted next depthkeeping place of iron ladle liquid level, and makes it rotation.When agitator rotates, the molten iron liquid level forms " V " shape vortex (center is low, and is high) all around, add sweetening agent this moment after, the sweetening agent particulate in the paddle end regions owing to turbulence disperses, and " spue " along radial direction, suspend then, around the axle center rotate and on float in the molten iron, that is to say, borrow this mechanical agitation that sweetening agent is involved in the molten iron and with contact, mix, stir, thereby carry out desulphurization reaction.When agitator starts, on liquid level, can't see sweetening agent, after stopping to stir, the dried thick shape slag that is generated floats on the molten iron face, promptly reaches the purpose of desulfurization after skimming.
Sichuan Lomon Mining ﹠ Metallurgy Co., Ltd does not have hot metal mixer, and molten iron flows directly in the iron ladle through trough from blast furnace.The iron flow that blast furnace flows out is little, when on average coming out of the stove at 30 minutes, so temperature drop is bigger.If sweetening agent is added in the iron ladle earlier, can't seethe, thereby at the bottom of sweetening agent is trapped in jar, can not produce reaction.If when stirring, add whole sweetening agents, then sweetening agent easily and molten iron bonding phenomenon takes place, make sweetening agent can't be in molten iron total overall reaction, thereby influence sweetening effectiveness.The present inventor passes through test of many times, gropes, and has formed the new sulfur method of a cover, has solved desulphurization problem.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new sulfur removal technology.
Technical scheme of the present invention: in stove taps a blast furnace process, add the 55-65% of sweetening agent total amount in trough, molten iron at the desulfurization platform, stirs in the iron ladle and also adds remaining sweetening agent after rolling.
Optimized technical scheme: in stove taps a blast furnace process, add 60% of sweetening agent total amount in trough, molten iron stirs and adds remaining sweetening agent at the desulfurization platform after rolling.
Particularly, press the 55-65% that adds the total consumption of sweetening agent in trough, and must press the flow of molten iron, slowly add, reach molten iron and gone out, the 55-65% of sweetening agent adds.When going out molten iron, iron ladle is preferably reserved the certain reaction space to sweetening agent, do not make molten iron go out overfill, cause sweetening agent difficulty or can not desulfurization.
At the desulfurization platform, in jar, add in the sweetening agent process, can not concentrate in jar and feed intake, should be earlier up and down stir about begin to add remaining sweetening agent after 5 minutes, must feed intake while stirring, forbid sweetening agent that packing phenomenon takes place in iron ladle, instantaneous vigorous reaction takes place when avoiding stirring, cause molten iron to spill and hurt sb.'s feelings.The effect of Jiao Baning is molten iron fully to be stirred use molten iron to form eddy current in iron ladle up and down, thereby uses sweetening agent fully to react.
After sweetening agent all added, stirring arm should stir up and down, and total desulfurization time must not be less than 15 minutes, finishes to reach the sweetening agent total overall reaction.In the sweetening process, the rotating speed of stirring arm is controlled at (90～120) rev/min.
Slotting people's degree of depth of stirring arm is controlled at molten iron 3/1～3/2 of the degree of depth of packing into.Can not insert deeply, shallow only, influence sweetening effectiveness.
Sulfur removal technology of the present invention can adopt existing sweetening agent.
Preferably, can use the sweetening agent of following weight proportion: calcium carbide 30-40%, lime 50-65%, fluorite 3-5%, soda ash 2-5%.Preferred scheme is: calcium carbide 35%, lime 55%, fluorite 5%, soda ash 5%.
The add-on of sweetening agent is a 2832kg/t iron.Preferred 30kg/t iron.
After adopting the inventive method, average desulfuration efficiency is 80%, and high desulfurization efficiency is 98%, and sulphur is below 0.045% after the desulfurization.Desulfuration efficiency 20% with former method, sulphur 0.15% is compared after the desulfurization, desulfuration efficiency has improved greatly, the sulphur senior general is low after the desulfurization, solved the not good predicament of the long-term sweetening effectiveness of Sichuan Lomon Mining ﹠ Metallurgy Co., Ltd preferably, simultaneously for adopting KR technology but the company that does not have a hot metal mixer provides a kind of new selection.
Embodiment
Embodiment 1 adopts the inventive method to carry out desulfurization test
By rotary conveyor deliver to thin broken through just breaking the back each raw material such as calcium carbide, lime, fluorite, soda ash, remove the iron contamination of each raw material by tramp iron separator after be by weight ratio: calcium carbide 35%, lime 55%, fluorite 5%, soda ash 5%, add in the ball mill by disc feeder, ball mill (mainly being steel ball and forging in the ball mill) carries out ball milling, and (granularity that is sweetening agent is all less than below the 1mm to granularity≤100 purposes 〉=90%, wherein less than 0.154mm greater than 90%) standby, moisture content is less than 0.1%, and is standby.
By add-on is the amount desulfurization of 30kg/t iron, and concrete sweetening process is as follows:
1) goes out molten iron (add in trough 60% sweetening agent)
Molten iron flows directly in the iron ladle through trough from blast furnace, comes out of the stove 30 minutes time.By consumption 3%, in trough, add slow adding, 60% sweetening agent.When molten iron stream was expired iron ladle, 60% sweetening agent added.
The periphery of hot-metal ladle and carriage must be dry, prevents to blow out.
2) iron ladle is skimmed
(1) desulfurization hot-metal bottle to the position of skimming, tilts to the angle of skimming (can not overflow be as the criterion with molten iron) by master station with jar by tow tractor delivery, takes off slag operation then.
(2) slag removal machine is connected power supply and is chosen manual or method of automatically operating (twisting conversion operations handle) before running, confirm the position of clear manually (ISW) or automatic (3PL) light demonstration and the hand push button that stops in emergency.
(3) to confirm that compressed-air actuated inlet pressure reaches 0.6～0.8MPa, working pressure〉0.45MPa.
(4) before the slag removal machine running, the preceding inlet side limit of dolly should be located at zero-bit, retreats the end limit and should be located at and pick up on the position, otherwise do not allow running.
(5) the front and back stroke 5-6 rice of slag removal machine highly is 0.9 meter, and the left rotation and right rotation angle is 12.50.
(6) principle can not be skimmed by force when the clinker that has in the molten iron in the jar greater than 600kg, molten iron should be turned back to hot metal mixer.
(7) molten iron all will be skimmed before and after stirring, and bits are taken off molten iron exposed 2/3 in jar
3) elevator
(1) must check before the operation that master operating station transfer switch, affirmation wireline and band-type brake are normal, carry out can using after the trial trip.
(2) iron ladle must be aimed at the medullary ray of skimming, the iron ladle of can tumbling operation.
When (3) elevator is operated on the machine side, only permitted to hang to take off to collude operation, tilt operation should be carried out at net control station.
4) stir
(1) at first tries the lamp inspection, confirm whether all working signal on the operator's console is normal.
(2) confirm molten iron narrow-necked earthen jar medullary ray aligning agitator medullary ray, positive negative error＜50mm.
(3) accurately survey the molten iron liquid level, and agitator carried out prebake conditions 3? minute (new stirrer be for 50 times before use the baking after soak sintering 5? 0 minute).It is 3-9 minute that agitator immerses the molten iron degree of depth 350～600mm churning time, 80～120 rev/mins of rotating speeds.
Stirring arm is forbidden out rotating machine in the decline process, prevent that molten iron from splashing everywhere, when drop to for after, smooth starting rotating machine again.
Before starting rotating machine, carry out and check affirmation, after the periphery of iron ladle is unmanned, can start rotating machine.
(4) the molten iron liquid level can draw the clock operation at 3000～3700, attention observation electric current in the whipping process (" 200A) and revolution fluctuation situation and coherent signal reaction, and stirring the even deceleration that finishes to implement in preceding 3 minutes necessity, but the back lower limit rotating speed that slows down 〉=78 rev/mins.
(5) should be earlier up and down stir about begin to add 40% sweetening agent after 5 minutes, must feed intake while stirring, forbid sweetening agent that packing phenomenon takes place in iron ladle, instantaneous vigorous reaction takes place when stirring, cause molten iron to spill and hurt sb.'s feelings.
This moment, rotating speed reduced by 2-5 commentaries on classics, when remaining 100kg apart from feeding intake, evenly speedup reaches required speed, because in the process of feeding intake, for guaranteeing operator's safety, should suitably reduce rotating speed to avoid the reaction of sweetening agent and molten iron violent, cause molten iron to spill and hurt sb.'s feelings. and splash and the brightness situation according to spark, carry out suitable deceleration and regulate.
After sweetening agent all added, stirring arm should stir up and down, and total desulfurization time must not be less than 15 minutes, finishes to reach the sweetening agent total overall reaction.The purpose of Jiao Baning is molten iron fully to be stirred use molten iron to form eddy current in iron ladle up and down, thereby uses sweetening agent fully to react.
(6) before following stirring arm, after must coming to a complete stop, iron ladle carries out.Every processing will confirm agitator for one jar, the agitator refractory materials damages or come off 〉=and during 50mm or have groove, eyelet pit situation must carry out could using behind the hot repair.
Test-results is as follows:
Average desulfuration efficiency is 80%, high desulfurization efficiency is 98%, sulphur is below 0.045% after the desulfurization, desulfuration efficiency 20% with former method, sulphur 0.15% is compared after the desulfurization, desulfuration efficiency has improved greatly, and the sulphur senior general is low after the desulfurization, has solved the not good predicament of the long-term sweetening effectiveness of Sichuan Lomon Mining ﹠ Metallurgy Co., Ltd preferably.
Claims (9)
- [claim 1] sulfur removal technology is characterized in that: in stove taps a blast furnace process, add the 55-65% of sweetening agent total amount in trough, molten iron at the desulfurization platform, stirs in the iron ladle and also adds remaining sweetening agent after rolling.
- [claim 2] sulfur removal technology according to claim 1 is characterized in that: go out in the molten iron process at stove, add 60% of sweetening agent total amount in trough; Molten iron after rolling, iron ladle moves to the desulfurization platform, stirs that molten iron also adds remaining sweetening agent in the iron ladle.
- [claim 3] sulfur method according to claim 2 is characterized in that: when going out molten iron, iron ladle can not overfill, must reserve the certain reaction space to sweetening agent.
- [claim 4] sulfur method according to claim 3 is characterized in that: in the process of tapping a blast furnace, slowly add when adding sweetening agent in trough, reach molten iron and gone out, 60% sweetening agent adds.
- [claim 5] sulfur method according to claim 2 is characterized in that: add in iron ladle in the sweetening agent process, earlier up and down stir about begins to add 40% sweetening agent after 5 minutes, feeds intake while stirring.
- [claim 6] sulfur method according to claim 5 is characterized in that: the rotating speed of stirring arm is controlled at 90～120 rev/mins in the iron ladle, and slotting people's degree of depth of stirring arm is controlled at molten iron 3/1～3/2 of the degree of depth of packing into.
- [claim 7] sulfur method according to claim 6 is characterized in that: rotating speed reduces by 2～5 when beginning to add 40% sweetening agent in the iron ladle is changeed, and when feeding intake residue 100kg, evenly speedup reaches required speed.
- [claim 8] sulfur method according to claim 7 is characterized in that: after sweetening agent all added, stirring arm stirred up and down, and total desulfurization time is no less than 15 minutes.
- [claim 9] is according to each described sulfur method of claim 1-8, it is characterized in that: its chemical ingredients of described sweetening agent is by weight ratio: calcium carbide 30-40%, lime 50-65%, fluorite 3-5%, soda ash 2-5%, press the total sweetening agent of 28-32kg/t iron.
Priority Applications (1)
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|---|---|---|---|
| CN200910301546A CN101532073A (en) | 2009-04-14 | 2009-04-14 | A desulfurizing process |
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| CN200910301546A CN101532073A (en) | 2009-04-14 | 2009-04-14 | A desulfurizing process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220447A (en) * | 2011-07-05 | 2011-10-19 | 宁波钢铁有限公司 | Method for two-step desulfurization of molten iron |
| CN102304601A (en) * | 2011-08-17 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | Molten iron desulfurization method of taphole area of blast furnace |
| CN102925628A (en) * | 2012-11-28 | 2013-02-13 | 攀钢集团成都钢钒有限公司 | Molten iron desulphurization method |
| CN103276135A (en) * | 2013-06-19 | 2013-09-04 | 济钢集团有限公司 | Hot metal desulfurization method |
| CN104060050A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method |
| 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 |
-
2009
- 2009-04-14 CN CN200910301546A patent/CN101532073A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220447A (en) * | 2011-07-05 | 2011-10-19 | 宁波钢铁有限公司 | Method for two-step desulfurization of molten iron |
| CN102304601A (en) * | 2011-08-17 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | Molten iron desulfurization method of taphole area of blast furnace |
| CN102925628A (en) * | 2012-11-28 | 2013-02-13 | 攀钢集团成都钢钒有限公司 | Molten iron desulphurization method |
| CN102925628B (en) * | 2012-11-28 | 2014-08-06 | 攀钢集团成都钢钒有限公司 | Molten iron desulphurization method |
| CN103276135A (en) * | 2013-06-19 | 2013-09-04 | 济钢集团有限公司 | Hot metal desulfurization method |
| CN103276135B (en) * | 2013-06-19 | 2015-01-14 | 济钢集团有限公司 | Hot metal desulfurization method |
| CN104060050A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method |
| CN104060050B (en) * | 2013-09-16 | 2016-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of desulfurization dephosphorization agent and half steel desulfurization dephosphorization simultaneously |
| 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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Effective date of registration: 20110318 Address after: 610031, No. three, section 57, Renmin Middle Road, Qingyang District, Sichuan, Chengdu Applicant after: MCC 19 Chengdu Construction Co., Ltd. Co-applicant after: Panzhihua MCC 19 Group Industry Development Co., Ltd. Address before: 617000 No. 350 Renmin Street, Sichuan, Panzhihua Applicant before: MCC Shijiu Construction Co., Ltd. |
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Open date: 20090916 |