CN86102862A - Carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag - Google Patents
Carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag Download PDFInfo
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- CN86102862A CN86102862A CN 86102862 CN86102862A CN86102862A CN 86102862 A CN86102862 A CN 86102862A CN 86102862 CN86102862 CN 86102862 CN 86102862 A CN86102862 A CN 86102862A CN 86102862 A CN86102862 A CN 86102862A
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Abstract
The invention belongs to the outer preconditioning technique field of Iron And Steel Industry molten iron stove.Be called for short the LSDS method.Its major technique feature is: 1. sweetening agent is with the high-temperature liquid state slag in oxygen converter or open hearth, the EAF Steelmaking Process; 2. molten iron is packed into and is filled the process time of sweetening agent hot metal ladle, tank car, i.e. the external desulfurization of hot metal process time; 3. be to contain in the powerful stirring of molten iron head fall when borrowing the dress molten iron and the sweetening agent that C plays the C-O reaction in high or higher FeO and the molten iron, produce fierce the boiling, both combine, and make molten iron and sweetening agent obtain better persistence and mix.
This law desulfurization degree can reach 90%, also dephosphorization desiliconization synchronously.
Description
One, title of the present invention: carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag.Be called for short: the LSDS method.
Two, the technical field of the invention and having contrasted with the method situation: the invention belongs to Iron And Steel Industry molten iron stove and give processing technology field outward, is to do the method that sweetening agent carries out external desulfurization of hot metal with the high-temperature liquid state slag in the steelmaking process.Here said " high-temperature liquid state " is comparatively speaking, is meant non-solid-state.And the domestic and international the whole bag of tricks of usefulness all is to make sweetening agent with the powdery solid-state material to carry out external desulfurization of hot metal, the two obvious difference.The present invention is applicable to that the enterprise of steel mill of blast furnace or cupola furnace-converter or open hearth, electric furnace Production Flow Chart and other carry out the enterprise of external desulfurization of hot metal; Particularly the enterprise of steel mill of blast furnace or cupola furnace-converter Production Flow Chart is the most suitable, its economic benefit the best.Converter, particularly oxygen converter current and expected future all account for steel and produce space of top prominence, and in the oxygen converter workshop, the production scheduling operation is relatively more nervous complicated, and this explanation is intended attaching most importance to the oxygen converter workshop, is example, to this law content, is illustrated.
By the domestic and international method of the various external desulfurization of hot metal of usefulness, all be the KR method, or shaking ladle process, or metal mixer car powder injection desulphurization method, or be the various phase class methods that derive from by it; Because all these methods are selected and the sweetening agent material that uses is all solid-state as powdery, therefore, in the performance technologies condition of sweetening agent and external desulfurization of hot metal installations and facilities in use; In technology and the technological operation; And be reflected in economically, on the economic benefit; With this law also show have different, and variant greatly.Now with point, the summary of the two difference, comprehensively contrast, And tabulates under the what: (one) please see the following form.
Ined all sorts of ways both at home and abroad and the comprehensive contrast table of this law discrepancy (continuous table one)
By the contrast of last table, obviously also main particular content of the present invention and technology principal feature, feature as can be seen; And advantage and positively effect.Be for having used various external desulfurization of hot metal methods both at home and abroad, institute can't replace, and is too far behind to catch up.
Three, purpose of the present invention
1. in order to help shaping up of motherland's " Four Modernizations " building cause, the institute of the anxious Party Central Committee and country is anxious.Country faces insufficient funds, the energy starved difficulty at present.National steel was produced 4,347 ten thousand tons in 1985, and wherein the oxygen converter steel is 2,157 ten thousand tons, except that Wuhan Iron and Steel Plant, Anshan iron and steel plant, a day steel have solved the partial molten iron secondary desulfurization, estimated that there are 1,800 ten thousand tons of molten iron in national large, medium and small section steel works enterprise, and is still anxious to be solved.Built a KR method by Wuhan Iron and Steel Plant, a year processing power is 40～500,000 tons, and the gross weight of equipment amount is 650 tons, and investment amount is 1,150 ten thousand yuan.(in the data the still undeclared installations and facilities that whether comprise the manufacturing of sweetening agent calcium carbide powder make an investment in).Even by copying, 40% calculating of reducing investment outlay will solve whole external desulfurization of hot metal problems, and national enterprise investment total charge also must be spent 200,015,000 yuan.And it is slow to go into operation, and does not comprise the molten iron for open hearth as yet.
2. realize early and carry out in order to help the set steel-making fine fodder policy of enterprise of China steel mill, help to solve the concrete technical problem in the fine fodder.Primary is desulfurization.Moreover be the dephosphorization desiliconization, with it simultaneously, also for helping in Ministry of Metallurgical Industry's the seventh five-year plan, the molten iron stove of proposition gives the brainstorm subject of processing-" converter less-slag operation " outward and can break through early and solve.
3. simultaneously, also be that the utilization of steel-making waste residue reaches the wherein energy and metal recovery, a kind of new way novel method is provided." turn waste into wealth ".
In order to reach the above object, analyze after deliberation and consider, LSDS method of the present invention is provided, relatively simple, be convenient to promote adopt and implement.
Four, the concrete technology contents of the present invention mainly contains:
About sweetening agent
About technological operation flow process and process operation explanation
About noting item in enforcement and the technological operation
1. about sweetening agent:
Sweetening agent of the present invention is as previously mentioned: be that its property feature is by finding out in the first segment (table one) that it has possessed superior performance and technical qualification with the high-temperature liquid state slag in the steelmaking process.Certainly it also has the basicity conditions of higher, and oxygen converter terminal point slag has enough base excesses generally 3～4, can supply desulfurization, and its reaction is:
Here, intend stressing a problem; Be that one of this law sweetening agent characteristics FeO is high or higher.It carries out the effect and the significance connotation of external desulfurization of hot metal to this law.This is based on the characteristics of external desulfurization of hot metal mechanism and analysis; Based on containing a large amount of carbon in the molten iron; Based on the superior advantageous features of the uniqueness of this sweetening agent high-temperature liquid state, it can play multi-function action to desulfurization, such as itself molten touching, omitted change slag slagging course and time, and good fluidity, sensible heat foot or the like, help desulfurization, promote and accelerate carrying out of desulfurization chemical reaction or the like.More than all, be this law and select and use to contain necessity and necessary and sufficient condition and the reason of the high material of FeO as sweetening agent.Also be objective base, the aspect also because the characteristic of FeO itself determines that stronger oxidisability is arranged, helps the flowability of slag in addition.Like this, actual capabilities have just been arranged, in sweetening process, utilized and the effect by FeO, the two better combines chemical action and physical action, can obtain the higher desulfuration effect.Thereby the feature that this law reflects on method in this respect is: when physical action has made full use of the dress molten iron, by means of factors such as molten iron head falls, produce powerful stirring, the thorough mixing that main effect is that molten iron and high-temperature liquid state slag are mixed soon and continues.Chemical action with C in the molten iron, plays the C-O intense reaction promptly by means of enough FeO, produces CO ， And and is produced good persistence boiling stirring, its main function and significance by its chemical potential; Be to make molten iron internal body composition fractionated molecule and ion to enliven.Thereby physical action and chemical action, complementary its weak point, bring out the best in each other, the molecule of molten iron and slag, the contact reacts area between the ion are greatly increased, strengthened contact frequency, therefore, although this law dress molten iron and desulfurization are for carrying out effective sweetening process time weak point, churning time weak point synchronously, still can be after once desulfurization be handled, it is better to obtain sweetening effectiveness.
This law sweetening agent is that the high-temperature liquid state slag in the steelmaking process meets when needing, and can add an amount of iron scale, or iron ore powder, limestone powder, and unprocessed dolomite powder etc. carry out external desulfurization of hot metal.In addition, also can increase high-temperature liquid state slag consumption when needed, And adds an amount of iron scale, limestone powder or unprocessed dolomite powder etc. when carrying out external desulfurization of hot metal.Can be synchronous remove phosphorus and silicon in the molten iron.Like this, desulfurization there are not much influences.Taking off the back scum silica frost also can support agriculture as phosphate fertilizer.
2. about technological operation flow process and process operation explanation:
This law is in technology and operational characteristics feature, by finding out in the first segment table one.And greatly simplify, simple.Now with its implementation method, with in the converter mill, and blast furnace is that example is described as follows:
(1) technological operation flow process is asked for an interview subsequent figures.
(2) process operation explanation:
Now be described as follows according to following process order: (please refer to accompanying drawing).
2-a)
Be shown in converter mill technological operation flow process
2-b) → be shown in the converter mill " to subcontract " the sulfur removal technology operating process
2-c)
Be shown in blast furnace plant technological operation flow process
About 2-a:, carry out external desulfurization of hot metal between converter bay by oxygen converter " two blow two " situation; And to illustrate under the most nervous situation between the operation.Segmentation parallel line production method by providing below can form production technique fully.Guarantee to produce to smelt and carry out smoothly.
For convenience of explanation, explanation earlier is what time:
One, whole technological operation flow process is divided into two sections parallel line productions; One end is by the hot metal mixer end, and one section by the converter end.
Its two, at the hot metal mixer end, be made as #1 with a driving, specializing in the running liquid slag and hang hot metal ladle and connects molten iron work.At the converter end, be made as #2 with a driving, specialize in the work of hanging molten steel pocket deslagging and adorning molten iron for converter.Electronic scales all is housed.
Its three, generally connect slag ladle with what hot metal ladle had replaced the converter stokehold, thus cancellation.The storage cinder ladle is also used hot metal ladle; Hot metal ladle is general can adorn 2～3 stove converter liquid slag approximately.In order to have interchangeability and the handiness on scheduling is used.
Now specify as follows:
About 2-a: at first by behind the #2 converter tapping, with pack into hot metal ladle A on the drag-out slag car of liquid slag remaining in the stove, wait the #2 driving to install after molten iron gets out of the way for it, lift by crane hot metal ladle A by the #1 driving, by stokehold tapping steel platform " ㄇ " shape hole, transport hot metal mixer one end back and go; With it simultaneously, the #2 driving can be trailed #1 and driven a vehicle and go to connect fortune and prepare molten iron for the #1 converter to the hot metal mixer end.About the hot metal ladle of the molten iron of unstowing, can going along withly return the hot metal mixer end, also can unload nearby and be placed on the platform, or help to be put back on the flatcar of slagging tap by the adjacent driving of platform in addition in case of necessity.# 2 driving is opened to the hot metal mixer end, can will be put in the hot metal ladle that has installed molten iron on the terrace and rise and winch to slagging-off facility platform, removes the desulfurization scum silica frost, after scratching clean, can be transported to the converter end and be the #1 converter molten iron of packing into.After #1 driving is transported hot metal ladle A back the hot metal mixer end, pour the storage cinder ladle into, and promptly unload and be put on the back stall that connects the molten iron position before the hot metal mixer or on the terrace, be hinged with molten iron with unnecessary superfluous slag in will wrap.Most of desulfurization scum silica frost flows into slag ladle by bag mouthful slag trough.After seeing the liquid level calmness, hot metal ladle A is hung in recurrence, unloads to be placed on the terrace of appointed place.Treat that the #2 driving goes to connect fortune, preparation is skimmed, supply with the #2 converter.So far, the whole production technological operation as one-period, is promptly accused and is finished.Desulfurization degree can reach more than 50～60%.
So, hot metal mixer end operation process time and converter end operation process time, the two balances each other substantially.It respectively is 15～20 minutes.From the converter smelting cycle, comprise non-cutting time from advancing molten iron-advance molten iron, in fact, generally be about 35～50 minutes.In " two blow two " situation, promptly average every mistake 17.5～25 minutes just needs supply one stove molten iron.Therefore,, can form production technique fully, guarantee to produce to smelt and carry out smoothly even external desulfurization of hot metal is carried out in converter " two blow two " in converter bay.And only with regard to using two vehicling operations.If adopt both at home and abroad the various external desulfurization of hot metal methods of usefulness, carry out between converter bay, reach requirement like this, probably be difficult.
About 2-b, then very simple, just in the operating process in the above after the #1 driving installs the hot metal ladle A of molten iron by the hot metal mixer lifting, the molten iron commentaries on classics poured into install liquid slag and be put in the hot metal ladle B on the terrace and get final product.As for skimming, not skimming, see molten iron sulfur-bearing target is determined.Take off as needs, the desulfurization scum silica frost scratches clean substantially and gets final product in the hot metal ladle A.The desulfurization scum silica frost flows into slag ladle by slag trough in the hot metal ladle B, and after the liquid level calmness, lifting is unloaded and is put on the terrace of appointed place again, treats to connect fortune by the #2 driving.So far, the operation of " subcontracting " sulfur removal technology is promptly accused and is finished.Desulfurization degree Yue Keda about 40～50%.
About 2-C, come metal mixer car from blast furnace, enter converter bay, after molten iron loads and unloads hot metal mixer, will store up in the cinder ladle liquid slag by driving and pour in the metal mixer car jar, return blast furnace then and connect molten iron again.Most of desulfurization scum silica frost flows into slag ladle by its slag trough, sees inner face liquid level calmness, again slagging as far as possible.The iron water amount of packing into should be no more than 70% of its effective volume.Because of desulfurization scum silica frost volume, because of CO expands to some extent, rotary kiln is striden molten iron and recrement then, the hot metal mixer of packing in the lump.Because this moment, FeO in the liquid slag has been C reduction in the molten iron, and is last atomic, do not have influence greatly.And the hot metal mixer slagging, generally comparatively convenient, and after hot metal ladle connects molten iron, see that slag also will scratch clean, and could supply with converter.So far, this technological operation is promptly accused and is finished.Desulfurization degree can reach more than 50～60%.
This technological operation method also can be when needed, increases the consumption of liquid slag; And adds an amount of iron scale, limestone powder or unprocessed dolomite powder etc., when carrying out external desulfurization of hot metal, then can be synchronous remove phosphorus and silicon in the molten iron, do like this, desulfurization is not had much influences.Its implementation method, convenient with this technological operation, effect is also relatively good, its concrete grammar is also very simple, promptly before blast furnace (or cupola furnace) taps a blast furnace, with top additional material, the iron scale etc. wanted, be added in the iron notch, flow into together in the metal mixer car that installed liquid slag or opened type hot-metal car jar or the hot metal ladle with molten iron and get final product.Below operation is the same.Take off the back scum silica frost,,, can make phosphate fertilizer through processing as not containing the material of harmful farm crop.But as additional fluorite, then the molten rate of Chinese holly reduces, and fertilizer efficiency is relatively poor.Adopt this method, dephosphorization rate Gao Keda 90%, desiliconization rate Gao Keda 50%.
At last, also should illustrate a bit: LSDS method of the present invention, about mixer means, under the situation of people's requirements and potentialities, also can utilize mixer means existing or that newly put, as machinery or to spray with gas be that power is that the means of carrier are carried out external desulfurization of hot metal or the like.
LSDS method of the present invention, all needs are carried out the enterprise, workshop of external desulfurization of hot metal etc. and can both be implemented to adopt.And how many molten iron are arranged, just can handle how many molten iron immediately.All molten iron all can obtain handling, and is unrestricted.It implements methods is various, can implement separately; Also can take as blast furnace (or cupola furnace)-steelshop, or the molten iron stove gives treatment station or hot metal mixer station or the like duplex practice outward; And add triplex process of " subcontracting " desulfurization or the like.Can certainly select according to actual capabilities and needs.Desulfurization degree can reach 75～80% respectively; And 90%.
About implement and technological operation in the item that should note
(1) consumption of sweetening agent: the liquid slag slag liquid layer degree of depth in hot metal ladle, tank car preferably can be 1/4～1/3 of molten iron useful volume height.Hot metal ladle is " weedy " preferably, rather than " short and fertile " type.This also is to influence one of external desulfurization of hot metal effect important factor.
(2) note before the dress molten iron and the dress molten iron carries out in the sweetening process, as see in hot metal ladle jar or the metal mixer car that liquid level condenses one deck crust is arranged, be commonly called as " black Mian shell ", must smash up with pestle immediately, make inner face CO gas, discharged immediately, exempt to give birth to splash.
(3) molten iron head fall preferably can be not less than 1.5 meters, and here, the molten iron head fall refers to: the molten iron mouth position when rocking-turn hot metal mixer, molten iron just can flow out to the hot metal ladle jar suitable for reading between apart height.
(4) speed of rocking-turn hot metal mixer dress molten iron, by slowly-fast-slow principle operation.The slag liquid level is disappeared, slag and molten iron thorough mixing, can continue maintenance be mixed into right, till.Do not shake again soon again, there is no need soon again.Because of reducing dress molten iron process time, promptly reduced the desulfurization effective procedure time, its effect just can not be fine.
(5) hot metal ladle, metal mixer car jar (containing the opened type hot-metal ladle and carriage) must be equipped with slag trough, one, and safe ready is in case anti-avulsion sulphur scum silica frost overflows damage equipment.Hot metal ladle connects molten iron with electric flatcar, the vehicle-mounted fortune of twist, and more institute is necessary.Its two, created condition, the unlikely limitation for increasing the liquid slag consumption.Its three, exempted from because of desulfurization scum silica frost volume to some extent the expansible characteristics change the volume of big hot metal ladle jar.
(6) metal mixer car molten iron mouth both sides must have enough big venting hole, make jar interior CO gas etc., emit immediately, exempt to give birth to splash.
(7) storage cinder ladle, may with situation with good conditionsi under, preferably be provided with a mixed slag hearth, it acts on as hot metal mixer.
Five, the advantage and the positively effect that have ined all sorts of ways both at home and abroad that compare of LSDS method of the present invention; In first segment (table one), listed contrast, no longer repeated.
Claims (2)
1, carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag, be called for short the LSDS method, it is characterized in that:
A. its sweetening agent is a high-temperature liquid material; Be with the high-temperature liquid state in oxygen converter or open hearth, the EAF Steelmaking Process, contain the high or higher slag of FeO and make sweetening agent and carry out external desulfurization of hot metal;
B. the molten iron process time in the hot metal ladle that fills sweetening agent, the tank car of packing into promptly is the process time of external desulfurization of hot metal, and both carry out synchronously;
C. the stirring action in the sweetening process; Be by means of the stirring action of dress molten iron head fall during molten iron with by means of containing enough FeO in the sweetening agent, with C in the molten iron, play the C-O intense reaction, produce the CO wallop, both combine, and make molten iron and sweetening agent obtain better mixing of persistence fully.
2, according to claim 1, can when needing, in sweetening agent, add an amount of reinforcing desulfurations such as iron scale, limestone powder or unprocessed dolomite powder; In the secondary desulfurization process, also can be synchronous remove phosphorus and silicon in the molten iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86102862 CN86102862A (en) | 1986-04-19 | 1986-04-19 | Carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86102862 CN86102862A (en) | 1986-04-19 | 1986-04-19 | Carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag |
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| Publication Number | Publication Date |
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| CN86102862A true CN86102862A (en) | 1987-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86102862 Pending CN86102862A (en) | 1986-04-19 | 1986-04-19 | Carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451131C (en) * | 2005-11-23 | 2009-01-14 | 上海宝钢冶金建设公司 | Production and utilization process for making steel using smelting slag |
| CN101428193B (en) * | 2008-11-26 | 2011-04-20 | 天津大学 | Wet-type desulfuration method for steel scoria with flue gas |
| CN102719588A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for carrying out slag washing desulfurization on molten iron by using residual heat injection steel slag |
| CN102732663A (en) * | 2012-03-29 | 2012-10-17 | 鞍钢股份有限公司 | Method for dephosphorization, desilicication and desulfurization of molten iron in iron folding process |
| CN102943146A (en) * | 2012-10-30 | 2013-02-27 | 沈阳东北大学冶金技术研究所有限公司 | Steel smelting slagging method, steel smelting method and slagging material |
| CN105779682A (en) * | 2016-03-16 | 2016-07-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for smelting stainless steel in dephosphorization converter by using limestone |
| CN110055367A (en) * | 2019-05-14 | 2019-07-26 | 重庆大学 | One kind being used for silicon removal pretreatment of molten iron desulfurization dephosphorization reagent and preparation method and application |
-
1986
- 1986-04-19 CN CN 86102862 patent/CN86102862A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451131C (en) * | 2005-11-23 | 2009-01-14 | 上海宝钢冶金建设公司 | Production and utilization process for making steel using smelting slag |
| CN101428193B (en) * | 2008-11-26 | 2011-04-20 | 天津大学 | Wet-type desulfuration method for steel scoria with flue gas |
| CN102719588A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for carrying out slag washing desulfurization on molten iron by using residual heat injection steel slag |
| CN102732663A (en) * | 2012-03-29 | 2012-10-17 | 鞍钢股份有限公司 | Method for dephosphorization, desilicication and desulfurization of molten iron in iron folding process |
| CN102943146A (en) * | 2012-10-30 | 2013-02-27 | 沈阳东北大学冶金技术研究所有限公司 | Steel smelting slagging method, steel smelting method and slagging material |
| CN102943146B (en) * | 2012-10-30 | 2015-07-29 | 沈阳东北大学冶金技术研究所有限公司 | A kind of smelting iron and steel slagging method, iron and steel smelting process and slag making materials |
| CN105779682A (en) * | 2016-03-16 | 2016-07-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for smelting stainless steel in dephosphorization converter by using limestone |
| CN105779682B (en) * | 2016-03-16 | 2017-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter |
| CN110055367A (en) * | 2019-05-14 | 2019-07-26 | 重庆大学 | One kind being used for silicon removal pretreatment of molten iron desulfurization dephosphorization reagent and preparation method and application |
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