CN104878161A - Slag pressing agent for converter slag tank, and preparation method thereof - Google Patents
Slag pressing agent for converter slag tank, and preparation method thereof Download PDFInfo
- Publication number
- CN104878161A CN104878161A CN201410070725.8A CN201410070725A CN104878161A CN 104878161 A CN104878161 A CN 104878161A CN 201410070725 A CN201410070725 A CN 201410070725A CN 104878161 A CN104878161 A CN 104878161A
- Authority
- CN
- China
- Prior art keywords
- slag
- converter
- wingdale
- pressure agent
- coke powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a slag pressing agent for a converter slag tank, and a preparation method thereof, and belongs to the technical field of steel metallurgy converter smelting. A technical problem of easy foaming of converter early stage slag dumped into the slag tank in the converter double-slag process smelting process in the prior art is mainly solved in the invention. The slag pressing agent for the converter slag tank comprises 75-95wt% of carbon, 5-25wt% of calcium carbonate, and the balance of coke powder and impurities in limestone. The slag pressing agent is prepared by mixing steel-making limestone with fly ash in a coke oven, which is the coke powder. The slag pressing agent is mainly used for pressing the converter early stage slag into the slag tank in the converter double-slag process smelting process.
Description
Technical field
The invention belongs to ferrous metallurgy converter smelting technical field, particularly a kind of converter slag ladle pressure agent and preparation method thereof.
Background technology
Efficiently, low cost, low emission production are the important directions that steel-smelting technology develops.In recent years, iron and steel enterprise and scientific research institution try to explore converter less-slag melting technique, as the Shoudu Iron and Steel Co Qian Gang company of China and the exploration of Shou Qin company less-slag operation technique achieve successfully.At present, iron and steel enterprise's active learning and this converter less-slag melting technique of exploitation, i.e. the top-blown oxygen converter smelting technology that " stays slag+bis-slag "." two slag " is be exactly converter is at initial smelting period, total when blowing oxygen quantity accounts for 20% ~ 40% of this stove blowing oxygen quantity, converter carry out the slagging of falling stove, slagging amount accounts for 30% ~ 70% of this stokehold phase total quantity of slag.Because the slag beneficiation of releasing is comparatively strong, dioxide-containing silica is higher, makes slag easily foam, volumetric expansion, slag ladle takes advantage of that to connect pressure large.Especially this slag easily continues foaming in slag ladle, and slag ladle can be caused time serious to overflow slag, and the high temperature furnace slag of spilling can burn out equipment and produce other potential safety hazards.
Disclosed in prior art, pressure agent is many, Chinese patent CN 102851452A, name is called, pressure agent and preparation method thereof, disclose a kind of pressure agent and preparation method thereof, this pressure agent is made up of waste residue when fluorite, low-grade silicocalcium and electrolytic production of aluminum, and the weight content of its each component is respectively: silica 1 0% ~ 15%, aluminium sesquioxide 20% ~ 35%, Calcium Fluoride (Fluorspan) 10% ~ 15% and pure aluminum 7% ~ 10%, is a kind of AOD ladle furnace use pressure agent.Chinese patent CN 101824506A, name is called, revolving furnace slag pressing agent and revolving furnace slag pressing method, the weight content disclosing each component of revolving furnace slag pressing agent is respectively: silica 1 0% ~ 15%, aluminium sesquioxide 1% ~ 6%, Indian red 20% ~ 30%, magnesium oxide 10% ~ 20% and calcium oxide 30% ~ 50%; For bessemerizing terminal, adding in converter, in order to reduce slag foaming degree, reaching the object of the not slagging of falling stove and direct tapping.Chinese patent CN 102212639A, name is called, converter foamed slag pressing agent and using method thereof, the weight content of each component of disclosed pressure agent is respectively: calcium oxide 30% ~ 35%, magnesium oxide 20% ~ 25%, aluminium sesquioxide 10% ~ 15%, silica 1 0% ~ 15%, boron trioxide 1.5% ~ 2.5% and iron protoxide be less than 1%; For the carbon period bessemerized, add-on is 2 ~ 3kg/t molten steel.Chinese patent CN 1121114, name is called, slag covering agent for oxygen top-blown convertor and production method thereof, the weight content of each component of disclosed pressure agent is respectively: carbonization rice husk 20% ~ 40%, coke grain 20% ~ 40%, carbon 20% ~ 40%, fluorite 3% ~ 5% and acidifying graphite 0.5% ~ 5%; For the process of bessemerizing.
Pressure agent disclosed in prior art, is used in Converter.Because the slag in slag ladle is poured out by converter, although the pressure agent of coverter pig can be used in slag ladle; But, if be directly used in slag ladle by Converter by pressure agent, more extra-expense can be produced on the one hand; Second aspect causes the total quantity of slag of slag ladle to increase, if Chinese patent CN102851452A, CN101824506A and CN102212639A composition is soild oxide substantially; The third aspect causes slag ladle refractory corrosion and contaminate environment, as contained fluorite in Chinese patent CN102851452A and CN1121114, does not meet environmental requirement.
Lack in prior art meet slag ladle need of production the problem that not only can solve slag foaming in slag ladle, but also do not increase the pressure agent of the total quantity of slag of slag ladle.
Summary of the invention
The object of this invention is to provide a kind of converter slag ladle pressure agent and preparation method thereof, when mainly solving converter " two slag " technique smelting in prior art, converter slag in early stage pours the technical problem of easily foaming in slag ladle into.
Converter slag beneficiation in early stage is comparatively strong, and dioxide-containing silica is higher, and slag is easily foamed, especially when a certain amount of molten iron is taken in slagging out of, in the carbon in molten iron and slag, the oxide compound of iron reacts, and produces CO gas, when gas discharge is obstructed, slag volume in slag ladle is expanded further.Converter is the time of falling stove in earlier stage, and the weight content of slag main ingredient is: full iron 12% ~ 27%, calcium oxide 20% ~ 40%, silica 1 5% ~ 35%, magnesium oxide 5% ~ 10%, manganese oxide 3% ~ 8% and Vanadium Pentoxide in FLAKES 2% ~ 6%.Therefore, the method solving slag foaming in slag ladle can be summed up as 2 points: one is the oxidisability reducing slag; Two is ejected by CO gas wherein.
For realizing object of the present invention, the technical solution used in the present invention is:
A kind of converter slag ladle pressure agent, the weight percent of its moiety is: carbon 75% ~ 95%, calcium carbonate 5% ~ 25%, surplus are the impurity in coke powder and Wingdale.
Further, a kind of converter slag ladle pressure agent, the weight percent of its moiety is: carbon 80% ~ 90%, calcium carbonate 10% ~ 20%, surplus are the impurity in coke powder and Wingdale.
According to the feature of converter slag in early stage, each component proportion of converter slag ladle pressure agent of the present invention is specifically determined according to the effect of each component in pressure agent.Carbon is used for the oxide compound of the iron in reduced blast furnace, reduces the oxidisability of slag, reduces the foaming tendency of slag.Calcium carbonate is used for improving the diffusibility of carbon in slag.If the proportioning of carbon is less in pressure agent, then the usage quantity of pressure agent can increase; If to obtain proportioning more for carbon in pressure agent, then the proportioning of calcium carbonate can reduce, and can reduce the diffusibility of carbon in slag.By a large amount of production tests, according to result of use, finally determine the proportioning of each component in pressure agent of the present invention, and the optimal proportion of each component in pressure agent of the present invention.
A preparation method for converter slag ladle pressure agent, comprises the following steps:
A, the fragmentation of Wingdale carried out, particle diameter≤1mm;
Wingdale after b, fragmentation and coke powder are prepared burden by following mass percent: carbon 75% ~ 95%, and calcium carbonate 5% ~ 25%, surplus are the impurity in coke powder and Wingdale;
Obtain finished product after c, stirring and evenly mixing, and carry out finished product packing, be preferably and often wrap 5kg.
Further, the Wingdale in step b of the present invention after fragmentation and coke powder are prepared burden by following mass percent: carbon 80% ~ 90%, calcium carbonate 10% ~ 20%, surplus are the impurity in coke powder and Wingdale;
Converter slag ladle pressure agent of the present invention is mixed by the Wingdale of the dedusting ash-coke powder of pit kiln and steel-making.By percentage to the quality, C content >=98% in coke powder; CaCO3 content >=96% in Wingdale.
Converter slag ladle pressure agent of the present invention, join in slag ladle in converter deslagging process, add-on is: 5 ~ 20kg/ slag per ton, and namely slag per ton adds 1 ~ 4 bag pressure agent.
Pressure agent of the present invention adds in slag ladle, and main generation is reacted as follows: (FeO)+C (coke powder)=Fe+CO ↑ reaction (1), CaCO
3=CaO+CO
2↑ reaction formula (2), the effect of the coke powder in the present invention, as shown in reaction formula (1), is used for the oxide compound of the iron in reduced blast furnace, thus reduces the oxidisability of slag, reduces the foaming tendency of slag.Acting as of Wingdale: the density improving pressure agent, makes it easily enter into slag, Wingdale at high temperature can decompose simultaneously, produce gas, improve the diffusibility of coke powder in slag, thus increase the reaction interface of coke powder and slag, accelerate the carrying out of chemical reaction.Simultaneously due to the high temperature action of slag, it is relatively rapider that reaction (1) and reaction (2) are carried out, and the velocity ratio generating gas is very fast.Utilize slag ladle greatly suitable for reading, lower young feature, namely gas is easy to discharge, and can not cause slag splash.Gas can form passage in slag, is discharged in air, solves CO gas and discharges the problem of being obstructed.Simultaneous reactions (1) and reaction (2) all belong to strong endothermic reaction, and it can reduce the temperature of slag in slag ladle, and slag is solidified, the possibility that can prevent slag from foaming further.
When the present invention well solves the smelting of converter " two slag " technique, pour the foaming problems of slag in slag ladle into.
The present invention has following positively effect compared to existing technology:
1, the main component of converter slag ladle pressure agent of the present invention is carbon, calcium carbonate, adds in slag ladle slag, the volume of slag is reduced rapidly, no longer produces foaming, and does not increase the total quantity of slag of slag ladle.
2, the preparation technology of converter slag ladle pressure agent of the present invention is simple, and cost is low.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
Embodiment adopts converter slag ladle pressure agent of the present invention to carry out pressure Slag treatment.When deslagging is smelted to 20 stove converters " two slag " technique, pressure agent of the present invention (chemical composition is as shown in table 1) is added in slag ladle, and contrast with 5 slag ladles (the 21st, 22,23,24 and No. 25) not adding pressure agent of the present invention, result is as shown in table 2.
The mass percent (%) of table 1 converter slag ladle of the present invention pressure agent chemical composition
Table 2 slag ladle pressure slag test effect
| Test number | The slag ladle quantity of slag/t | Pressure agent add-on/kg | Pressure agent is numbered | Slag ladle slag situation |
| 1 | 6.2 | 30 | 1# | Chemical reaction is rapid, and slag foaming is few, and the top of the slag has certain altitude |
| 2 | 6.8 | 70 | 1# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 3 | 6.5 | 95 | 1# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 4 | 5.8 | 115 | 1# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 5 | 7.1 | 70 | 1# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 6 | 5.6 | 85 | 1# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 7 | 6.1 | 60 | 1# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 8 | 6.8 | 35 | 2# | Chemical reaction is rapid, and slag foaming is few, and the top of the slag has certain altitude |
| 9 | 6.4 | 65 | 2# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 10 | 7.4 | 110 | 2# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 11 | 4.8 | 95 | 2# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 12 | 5.5 | 55 | 2# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 13 | 6.0 | 60 | 2# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 14 | 7.2 | 70 | 2# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 15 | 5.6 | 55 | 3# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 16 | 5.8 | 85 | 3# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 17 | 6.2 | 60 | 3# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 18 | 6.5 | 100 | 3# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 19 | 6.0 | 60 | 3# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 20 | 4.8 | 70 | 3# | Chemical reaction is rapid, and slag volume reduces rapidly, and slag does not foam |
| 21 | 4.9 | - | - | Slag foams, and the slag ladle top of the slag is high, but the slag that do not overflow |
| 22 | 4.0 | - | - | Slag foaming is serious, and slag ladle overflows slag |
| 23 | 4.6 | - | - | Slag foaming is serious, and slag ladle overflows slag |
| 24 | 4.4 | - | - | Slag foaming is serious, and slag ladle overflows slag |
| 25 | 4.7 | - | - | Slag foaming is serious, and slag ladle overflows slag |
Embodiments of the invention test number 1 ~ 20, do not carry out pressing the situation of Slag treatment (test number 21 ~ 25) to contrast with slag ladle, its Advantages found can well control slag ladle slag foaming problems, situ production deslagging process, operator need not worry that slag ladle overflows slag, and slow down slagging speed, affect rhythm of production, improve the security of operation simultaneously.
Pressure agent main component of the present invention is the dedusting ash of pit kiln, belongs to the recycling of refuse, and Wingdale is the Wingdale of common steel-making, and additional cost increases seldom; The usage quantity of pressure agent of the present invention is little, and product is mostly gas, can not cause the increase of the total quantity of slag of slag ladle.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (5)
1. a converter slag ladle pressure agent, is characterized in that the weight percent of moiety is: carbon 75% ~ 95%, calcium carbonate 5% ~ 25%, surplus are the impurity in coke powder and Wingdale.
2. a kind of converter slag ladle pressure agent as claimed in claim 1, is characterized in that the weight percent of moiety is: carbon 80% ~ 90%, calcium carbonate 10% ~ 20%, and surplus is the impurity in coke powder and Wingdale.
3. a preparation method for converter slag ladle pressure agent, is characterized in that, described method comprises the following steps:
A, the fragmentation of Wingdale carried out, particle diameter≤1mm;
Wingdale after b, fragmentation and coke powder are prepared burden by following mass percent: carbon 75% ~ 95%, and calcium carbonate 5% ~ 25%, surplus are the impurity in coke powder and Wingdale;
Obtain finished product after c, stirring and evenly mixing, and carry out finished product packing.
4. the preparation method of a kind of converter slag ladle pressure agent as claimed in claim 3, it is characterized in that, the Wingdale in described step b after fragmentation and coke powder are prepared burden by following mass percent: carbon 80% ~ 90%, calcium carbonate 10% ~ 20%, surplus are the impurity in coke powder and Wingdale.
5. the preparation method of a kind of converter slag ladle pressure agent as claimed in claim 3, it is characterized in that, described coke powder is the dedusting ash of pit kiln, and described Wingdale is the Wingdale of steel-making, by percentage to the quality, C content >=98% in coke powder; CaCO3 content >=96% in Wingdale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410070725.8A CN104878161A (en) | 2014-02-28 | 2014-02-28 | Slag pressing agent for converter slag tank, and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410070725.8A CN104878161A (en) | 2014-02-28 | 2014-02-28 | Slag pressing agent for converter slag tank, and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104878161A true CN104878161A (en) | 2015-09-02 |
Family
ID=53945833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410070725.8A Pending CN104878161A (en) | 2014-02-28 | 2014-02-28 | Slag pressing agent for converter slag tank, and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104878161A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543778A (en) * | 2016-06-24 | 2018-01-05 | 上海梅山钢铁股份有限公司 | A kind of device and method for detecting blast-furnace slag viscosity |
| CN110139938A (en) * | 2017-02-08 | 2019-08-16 | 日本制铁株式会社 | Inhibit the method for slag bloating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787201A (en) * | 2012-08-31 | 2012-11-21 | 首钢京唐钢铁联合有限责任公司 | Application of coal serving as steelmaking slag pressing agent and method for inhibiting steel slag bubbles |
| CN103451374A (en) * | 2013-09-22 | 2013-12-18 | 新疆中合大正商贸有限公司 | Production process of aluminium slag adjusting agent for LF refining furnace |
| CN103484595A (en) * | 2013-09-17 | 2014-01-01 | 新疆中合大正商贸有限公司 | Production process of magnesian slag pressing agents |
-
2014
- 2014-02-28 CN CN201410070725.8A patent/CN104878161A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787201A (en) * | 2012-08-31 | 2012-11-21 | 首钢京唐钢铁联合有限责任公司 | Application of coal serving as steelmaking slag pressing agent and method for inhibiting steel slag bubbles |
| CN103484595A (en) * | 2013-09-17 | 2014-01-01 | 新疆中合大正商贸有限公司 | Production process of magnesian slag pressing agents |
| CN103451374A (en) * | 2013-09-22 | 2013-12-18 | 新疆中合大正商贸有限公司 | Production process of aluminium slag adjusting agent for LF refining furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543778A (en) * | 2016-06-24 | 2018-01-05 | 上海梅山钢铁股份有限公司 | A kind of device and method for detecting blast-furnace slag viscosity |
| CN110139938A (en) * | 2017-02-08 | 2019-08-16 | 日本制铁株式会社 | Inhibit the method for slag bloating |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102296141B (en) | Converter steelmaking final slag modifier and use method thereof | |
| CN103160643B (en) | The smelting process of a kind of carburelant and preparation method thereof and vanadium-bearing hot metal | |
| CN108085577B (en) | A kind of smelting process improving ton steel scrap ratio | |
| CN108148942B (en) | A kind of converter slag stays slag gasification dephosphorization method and recycles smelting process | |
| CN100564548C (en) | A kind of high-basicity refining slag for slag washing of revolving furnace steel-making | |
| CN107299181B (en) | The method of converter gasification dephosphorized slag circulation dephosphorization steel-making | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN102251068B (en) | Vanadium-extracting cooling agent and preparation method thereof | |
| CN101892352B (en) | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof | |
| CN113416814B (en) | Method for realizing zero emission of refining slag of LF (ladle furnace) | |
| CN105506226B (en) | A kind of method that hot metal desiliconization, pre- decarburization and pre- dephosphorization are carried out in hot-metal bottle | |
| CN102827990A (en) | Fluoride-free slagging medium for use in converter and preparation method thereof | |
| CN110157854A (en) | A method of the deoxidation of molten steel alloying in converter | |
| CN105018678B (en) | A kind of steel desulfurization agent and its sulfur method and method for making steel | |
| CN107779550B (en) | The method of molten steel manganeisen additional amount is reduced in a kind of refining process | |
| CN101413044B (en) | Alloy addition method for improving yield of ferromolybdenum | |
| CN111139332B (en) | Slag former and light and thin scrap steel mixed processing furnace entering process | |
| CN102586537A (en) | Vanadium extraction coolant and its preparation method | |
| CN104878161A (en) | Slag pressing agent for converter slag tank, and preparation method thereof | |
| CN105200192B (en) | Liquid steel refining slag and its preparation method and application | |
| CN102146500A (en) | Fluxing agent for smelting steel as well as preparation and use methods thereof | |
| CN107447071A (en) | One kind contains Na2O semi-steel making slag former and preparation method thereof | |
| CN101831525B (en) | Dephosphorization method for molten iron | |
| CN103966387B (en) | Adopt the method for semi-steel making | |
| CN103031409B (en) | Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150902 |