CN103160631B - A kind of working method of molten iron silicon reduction - Google Patents

A kind of working method of molten iron silicon reduction Download PDF

Info

Publication number
CN103160631B
CN103160631B CN201110425330.1A CN201110425330A CN103160631B CN 103160631 B CN103160631 B CN 103160631B CN 201110425330 A CN201110425330 A CN 201110425330A CN 103160631 B CN103160631 B CN 103160631B
Authority
CN
China
Prior art keywords
molten iron
silicon
iron
falling
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.)
Active
Application number
CN201110425330.1A
Other languages
Chinese (zh)
Other versions
CN103160631A (en
Inventor
刘绍昌
马忠辉
杨作平
张福海
杜立朝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anshan Iron Roll Co., Ltd.
Original Assignee
Angang Heavy Machinery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Angang Heavy Machinery Co Ltd filed Critical Angang Heavy Machinery Co Ltd
Priority to CN201110425330.1A priority Critical patent/CN103160631B/en
Publication of CN103160631A publication Critical patent/CN103160631A/en
Application granted granted Critical
Publication of CN103160631B publication Critical patent/CN103160631B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention relates to cast iron melting field, in particular to a kind of molten iron silicon reduction working method, it is characterized in that, first carry out indirect oxidation fall silicon operation to falling ferrosilicon water in tundish, then the molten iron after falling silicon process is returned smelting furnace and carry out restoring operation, in smelting furnace, micro-increasing silicon or micro-increasing manganese refining treatment are carried out to molten iron, solve molten iron peroxidation problem.Compared with prior art, the invention has the beneficial effects as follows: 1) utilize molten iron and Na 2cO 3powder contact produces self-boiling effect, guarantees that the element silicon in molten iron fully reacts with iron scale, target can be had to fall silicon to siliceous molten iron realization.2) molten iron silicon reduction technological operation is simple, and it is effective to fall silicon, and it is low to fall silicon cost.3) in stove, increase " increase silicon or increase manganese " operation link, solve molten iron peroxidation problem after silicon of falling, can effectively ensure to fall ferrosilicon water overall quality performance as oxygen level, molten iron Quench, mobility stable, the molten iron after process can be directly used in cast cast prod.

Description

A kind of working method of molten iron silicon reduction
Technical field
The present invention relates to cast iron melting field, particularly a kind of molten iron silicon reduction working method.
Background technology
At present in order to reduce the production cost of cast prod, the various waste and old furnace charge of a large amount of use in cast iron melting process, thus the technical problem underlying brought is exactly " silicon " content overproof.In cast iron melting process, " silicon " element is mainly present in the middle of molten iron with solid solution free state and oxidation state two kinds of modes.In oxidized compound, " silicon " element is insoluble to molten iron, is present in the middle of slag, can be removed by " silicon " element of oxidation state by working method of skimming; And " silicon " element be present in solid solution free state form in molten iron, if by its " oxidation ", the SiO being insoluble to molten iron can be generated 2and enter into slag, then by working method of skimming by SiO 2get rid of molten iron external, molten iron silicon reduction operation object can be realized.
" silicon " element is impelled to be had two kinds by the approach of " oxidation ": direct oxidation method and indirect oxidation method.Direct oxidation method: keep cast iron melting ambiance to be oxidizing atmosphere (or directly to oxygen blast operation in molten iron), under ambient condition directly there is chemical reaction with the element silicon in molten iron and generate SiO in rich " oxygen " 2to get rid of from molten iron in time again after becoming slag, can realize falling silicon operation; Indirect oxidation method: impel " silicon " element and other oxide compound in molten iron (or jet in molten iron fall silica flour agent with interpolation) indirectly " oxidation-reduction " to occur and react, generation SiO 2to get rid of from molten iron in time again after becoming slag, also can realize falling silicon operation.
Relatively two kinds are fallen silicon working method: direct oxidation method is while falling silicon, and because oxidative environment atmosphere is wayward, while " oxidation " element silicon, in adjoint molten iron, ferro element and other oxyphilic element also will be simultaneously oxidized.The existence of " oxygen enrichment " molten iron and nonmetal oxide, can greatly reduce molten iron overall quality performance; Silicon operation falls in indirect oxidation method, and key problem in technology point is correctly to choose element silicon and oxygen element avidity greatly, and again can not with " iron " element generation chemical reaction silicon materials fall.
In prior art, mostly be employing winding-up, oxygen blast in stove, dose desiliconization material, or with stream, silicon falls stove is outer, the drawback of these working method has: 1) complex operation, fall silicon cost high (equipment cost and material cost), fall that silicon effect is unstable, molten iron oxidation scaling loss is not easy to control; 2), when falling silicon in stove, reaction product---slag is not easy to remove; 3) remnants the existence of silicon materials is fallen and molten iron oxidation scaling loss extent control improper, molten iron overall quality can be caused to decline; 4) silicon falls in the outer chute of stove, and reaction is steady, is largely subject to molten iron flow rates and falls silicon materials whether react impact cmpletely, easily cause the instability of falling silicon effect.
" method (the patent No. of blast-melted pre-treatment desiliconization, 02153413.6) ", a kind of manufacture method of desulfurizing iron hot metal containing low silicon " (patent No.: 03802274.5) ", " containing high chromium hot melt, silicon technology (patent No. 200610028377.3) falls ", " before molten iron furnace significantly desulfurization or simultaneously three de-thorough liberation blast furnace and converters " (patent No.: 200510071571.5), or winding-up is adopted in stove, oxygen blast, dose desiliconization material, or with stream, silicon falls outside stove, the maximum common ground of these working method only carries out oxidation to molten iron and falls silicon operation, not from touch upon in fact molten iron peroxidation this how to process, molten iron after silicon falls as stated above only as steel-making major ingredient, not directly pour into a mould product.
Summary of the invention
The object of the present invention is to provide a kind of working method of molten iron silicon reduction, overcome the deficiencies in the prior art, meet and fall that silicon is simple to operate, cost is low, fall the effective requirement of silicon, solve the molten iron peroxidation problem that indirect oxidation method causes, ensure that molten iron overall quality performance does not decline, the molten iron silicon content after process is stable can be directly used in cast cast prod.
The present invention realizes by the following technical solutions:
A kind of working method of molten iron silicon reduction, first carry out indirect oxidation fall silicon operation to falling ferrosilicon water in tundish, then the molten iron after falling silicon process is returned smelting furnace and carry out restoring operation, in smelting furnace, micro-increasing silicon or micro-increasing manganese refining treatment are carried out to molten iron, solve molten iron peroxidation problem, its concrete operation step is as follows:
1) first at the bottom of tundish, Na is discharged in falling silicon equivalent weight ratio 2cO 31420 ~ 1520 DEG C of molten iron are poured in tundish by powder and iron scale, all to pour in tundish after reaction terminates until molten iron, scratch clean molten iron surface scum, turn back molten iron smelting furnace again, and described iron scale is the steel rolling byproduct after drying, pulverizing, and its main component is FeO, Fe 2o 3and Fe 3o 4, wherein FeO content accounts for more than 80%, granularity 0.5 ~ 15mm, described Na 2cO 3powder size < 0.5mm;
Add Na 2cO 3the object of powder utilizes high temperature liquid iron and Na 2cO 3powder instantaneous touch generation decomposition reaction Na 2cO 3=Na 2o+CO 2↑, the CO of generation 2gas makes molten iron seethe with excitement and stirs iron scale Dispersed precipitate in molten iron, impels iron scale fully to contact with element silicon in molten iron, realization [Si]+2 (O) → (SiO 2) chemical reaction, realize the object of molten iron silicon reduction.Pour in the process of molten iron to tundish, more favourable guarantee is fallen ferrosilicon water and is fully mixed with iron scale, recurs " oxidation-reduction " reaction.
2) in smelting furnace, in molten iron, ferro-silicon is added or manganeseirom carries out refining operation, object is reduction step 1) in the molten iron of superoxidant state, it increases silicon or increasing manganese target is only 0.04 ~ 0.05% of molten iron, directly pours into a mould product under the molten iron like this after process can keep always falling the constant prerequisite of silicon effect.
Describedly fall correspondence when silicon equivalent weight is 0.05 ~ 0.12% and discharge 8 ~ 15Kg/t steel oxidation iron sheet and 0.3 ~ 0.6Kg/t steel Na 2cO 3powder.
Described Na 2cO 3powder and iron scale to discharge order be first put Na 2cO 3powder, and then put iron scale.Iron scale and Na in silicon operating process are falling 2cO 3the order of addition(of ingredients) of powder is different, and it is different for falling silicon effect, adds Na after first adding iron scale 2cO 3powder, may cause iron scale can not completely and molten iron occur.Na 2cO 3powder contacts with high temperature liquid iron and decomposition reaction occurs, the CO of generation 2gas covers iron scale surface, will cause iron scale surface passivation, affects silicon in iron scale and molten iron and [Si]+2 (O) → (SiO fully occurs 2) chemical reaction, or a part of iron scale not reacts;
Described Na 2cO 3powder and iron scale fully mix before discharging, and utilize Na 2cO 3iron scale particle separation comes by powder, more favourablely impels element silicon in iron scale and molten iron to react, and this program is best, but operational hypothesis is Na 2cO 3powder and iron scale must fully mixing, otherwise also can affect and fall silicon effect.
Compared with prior art, the invention has the beneficial effects as follows: 1) in tundish, add Na 2cO 3adopt molten iron directly to pour method after powder and iron scale, utilize molten iron and Na 2cO 3powder contact produces self-boiling effect, guarantees that the element silicon in molten iron fully occurs " oxidation-reduction reaction " with iron scale, and the present invention can have target to fall silicon to any silicon content molten iron realization.2) molten iron silicon reduction technological operation is simple, and it is effective to fall silicon, and it is low to fall silicon cost.3) in stove, increase " increase silicon or increase manganese " operation link, solve molten iron peroxidation problem after silicon of falling, can effectively ensure to fall ferrosilicon water overall quality performance as oxygen level, molten iron Quench, mobility stable, the molten iron after process can be directly used in cast cast prod.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
Embodiment 1
For disposable process 22.54 tons of siliceous molten iron, the iron scale selected is the steel rolling byproduct after drying, pulverizing, and its main component is FeO, Fe 2o 3and Fe 3o 4, wherein FeO content accounts for more than 80%, granularity 0.5 ~ 15mm, described Na 2cO 3powder size < 0.5mm.When stokehold silicone content 2.52%, when target control silicone content is 1.15%, 1420 ~ 1520 DEG C of high temperature liquid irons is directly gone out and is added with a certain amount of iron scale and Na in bottom 2cO 3in the tundish of powder uniform mixture, question response steadily scratches clean dross, and sample examination molten iron silicon content is 1.13%, then the smelting furnace that turned back by molten iron, in smelting furnace, add the ferro-silicon of a certain amount of 75% in molten iron, after refining, the whole silicon of molten iron is 1.15%.
10Kg iron scale, 0.4KgNa is added with ton molten iron 2cO 3it is target that powder and refining increase silicon 0.05%, and the actual silicon 0.12% that falls of ton molten iron calculates, wherein:
Iron scale addition is: (2.52-1.15) %/0.12%*22.54 ton * 10Kg/ ton molten iron=2573Kg,
Na 2cO 3powder addition is: (2.52-1.15) %/0.12%*22.54 ton * 0.4Kg/ ton molten iron=103Kg,
The ferro-silicon addition of 75% is: 22.54 tons of * 0.05%/75%=15.03Kg.
Embodiment is analyzed:
Falling refining reduction plan increasing silicon 0.05% in silicon operating process, actual refining reduction increases silicon 0.02%, and this may fluctuate relevant with the interpolation ferrosilicon rate of recovery or composition, does not reach actual increasing silicon amount; Also 0.03% silicon is likely had to participate in " oxygen enrichment " reaction in molten iron.Production practice are verified, after falling silicon, molten iron is necessary that carrying out refining increases silicon deoxidation operation, ensures that molten iron over-all properties is constant.In silicon falls in whole process and increasing silicon operates, silicone content composition fluctuation 0.02%, can ignore, add 10Kg iron scale, 0.4KgNa by ton molten iron 2cO 3powder and refining increase silicon 0.05% and add 75% ferrosilicon, and the actual silicon that falls of ton molten iron can reach 0.12%.
Embodiment 2
To 3.2 tons of molten iron, stokehold silicone content 1.85%, target control silicone content is 0.63%, and the iron scale selected is the steel rolling byproduct after drying, pulverizing, and its main component is FeO, Fe 2o 3and Fe 3o 4, wherein FeO content accounts for more than 80%, granularity 0.5 ~ 15mm, described Na 2cO 3powder size < 0.5mm.Directly gone out in hot metal ladle by 1420 ~ 1520 DEG C of high temperature liquid irons, hot metal ladle bottom is N acO 3powder, top layer is iron scale, and after question response steadily scratches clean dross, sample examination molten iron silicon content is 0.62%.In refining furnace, add the ferrosilicon of 75%, after 10 minutes, sample examination finished product molten iron silicon content is 0.63%, is 0.12% calculating with the actual silicon amount of falling of ton molten iron, wherein:
Iron scale addition is: (1.85-0.63) %/0.12%*3.2 ton * 10Kg/ ton molten iron=325Kg,
Na 2cO 3powder addition is: (1.85-0.63) %/0.12%*3.2 ton * 0.4Kg/ ton molten iron=13Kg,
The ferro-silicon addition of 75% is: 3.2 tons of * 0.05%/75%=2.1Kg.
Embodiment is analyzed:
Follow iron scale ton molten iron addition 10Kg, Na in principle falling in silicon operating process 2cO 3increase " oxygen enrichment " composition in Si reduction molten iron by 0.05% in powder ton molten iron addition 0.4Kg, refining process, substantially can fall the target of silicon 0.12% by held stationary.It is worth mentioning: in embodiment 2, after molten iron silicon reduction, refining increasing silicon reaches 0.63% by 0.62%, only improve 0.01%, illustrate that silicon falls in base iron lower, after falling silicon, molten iron more " oxygen enrichment ", more need increase the process of silicon deoxy technology, just can ensure that molten iron overall quality does not change.

Claims (1)

1. the working method of a molten iron silicon reduction, it is characterized in that, first carry out indirect oxidation fall silicon operation to falling ferrosilicon water in tundish, then the molten iron after falling silicon process is returned smelting furnace and carry out restoring operation, in smelting furnace, micro-increasing silicon or micro-increasing manganese refining treatment are carried out to molten iron, solve molten iron peroxidation problem, its concrete operation step is as follows:
1) first at the bottom of tundish, Na is discharged in falling silicon equivalent weight ratio 2cO 31420 ~ 1520 DEG C of molten iron are poured in tundish by powder and iron scale, all to pour in tundish after reaction terminates until molten iron, scratch clean molten iron surface scum, turn back molten iron smelting furnace again, and described iron scale is the steel rolling byproduct after drying, pulverizing, and its main component is FeO, Fe 2o 3and Fe 3o 4, wherein FeO content accounts for more than 80%, granularity 0.5 ~ 15mm, described Na 2cO 3powder size < 0.5mm;
2) in smelting furnace, in molten iron, ferro-silicon is added or manganeseirom carries out refining operation, object is reduction step 1) in the molten iron of superoxidant state, it increases silicon or increasing manganese target is only 0.04 ~ 0.05% of molten iron, directly pours into a mould product under the molten iron like this after process can keep always falling the constant prerequisite of silicon effect;
Describedly fall correspondence when silicon equivalent weight is 0.05 ~ 0.12% and discharge 8 ~ 15Kg/t steel oxidation iron sheet and 0.3 ~ 0.6Kg/t steel Na 2cO 3powder; Described Na 2cO 3powder and iron scale to discharge order be first put Na 2cO 3powder, and then put iron scale; Or described Na 2cO 3powder and iron scale fully mix before discharging.
CN201110425330.1A 2011-12-17 2011-12-17 A kind of working method of molten iron silicon reduction Active CN103160631B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110425330.1A CN103160631B (en) 2011-12-17 2011-12-17 A kind of working method of molten iron silicon reduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110425330.1A CN103160631B (en) 2011-12-17 2011-12-17 A kind of working method of molten iron silicon reduction

Publications (2)

Publication Number Publication Date
CN103160631A CN103160631A (en) 2013-06-19
CN103160631B true CN103160631B (en) 2016-01-20

Family

ID=48584165

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110425330.1A Active CN103160631B (en) 2011-12-17 2011-12-17 A kind of working method of molten iron silicon reduction

Country Status (1)

Country Link
CN (1) CN103160631B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113355466A (en) * 2021-04-27 2021-09-07 广东韶钢松山股份有限公司 Method for treating high-silicon molten iron produced during blow-in of blast furnace
CN114700471A (en) * 2022-03-31 2022-07-05 乐清市和瑞恒模具科技有限公司 Deslagging operation method in casting pouring process

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2862810A (en) * 1950-02-02 1958-12-02 Alexandrovsky Georges Process and apparatus for reducing the silicon content and increasing the temperature of molten pig iron
JPS5827916A (en) * 1981-08-12 1983-02-18 Kawasaki Steel Corp Desiliconizing method for molten iron
JPS59173213A (en) * 1983-03-22 1984-10-01 Nippon Kokan Kk <Nkk> Desiliconization of hot metal
JPS59182907A (en) * 1983-04-01 1984-10-17 Sumitomo Metal Ind Ltd Desiliconizing treatment of molten iron
CN1238530C (en) * 2002-11-27 2006-01-25 盛富春 Method for pretreating blast furnace melted iron to desiliconize
CN102071276B (en) * 2010-12-22 2012-07-04 中钢集团邢台机械轧辊有限公司 Method for reducing silicon content of molten iron

Also Published As

Publication number Publication date
CN103160631A (en) 2013-06-19

Similar Documents

Publication Publication Date Title
CN105132612B (en) Converter less slag smelting early stage deslagging control method
CN102134628A (en) Smelting method of low-carbon aluminium killed steel with low silicon content
CN103014221A (en) Method for producing high-aluminum steel plate blanks
CN102268513B (en) Method for improving castability of molten steel of medium and low carbon steel
CN102108430A (en) Ultra-low carbon steel slag modifier and adding method thereof
CN100453658C (en) Deoxygenation furnace-curing agent and its production
CN103484595B (en) Production process of magnesian slag pressing agents
CN105506226B (en) Method for carrying out pre-desiliconization, pre-decarburization and pre-dephosphorization on molten iron in molten iron tank
CN115323099A (en) Steelmaking method for recycling magnetic separation steel slag by converter
CN103031401B (en) Method for converter steelmaking by LF (Ladle Furnace) refining furnace reducing slag
CN101935740A (en) White slag refining agent for LF (Ladle Furnace) refining furnace and preparation method thereof
CN101403023A (en) Ultra-deep desulfuration method for hot metal
CN114350879B (en) Smelting method of low-carbon ultralow-sulfur pure iron
CN103160631B (en) A kind of working method of molten iron silicon reduction
CN101660022B (en) Method for improving steel cleanness of stainless steel
US20130019715A1 (en) Composition for reducing the oxygen potential of slag
CN108048615A (en) A kind of desulfurizing agent for hot-metal preprocess and preparation method thereof
CN111996330A (en) Process for smelting precise or special alloy by multi-slag method in medium-frequency induction furnace for desulfurization and oxygen removal
CN105506219B (en) Aluminum-free heating agent for chemical heating outside molten steel furnace and preparation method thereof
CN104109736B (en) A kind of method of 304 stainless steel of AOD converter smeltings
CN114672616B (en) Molten scrap steel molten iron modifier and preparation method and application thereof
CN103031409B (en) Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace
CN105112598B (en) A kind of method that converter product bottom slag is directly used in pneumatic steelmaking
CN102851453B (en) Composite refining slag for special-shaped blank molten steel smelting, and preparation method and application thereof
CN106311998A (en) Preparation and use method of molten steel covering agent

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20171221

Address after: 114021 Tiexi District, Liaoning City, Anshan Iron and steel plant

Patentee after: Anshan Iron Roll Co., Ltd.

Address before: Anshan City, Liaoning province 114000 Lishan District Jianguo Road 40 A

Patentee before: Angang Heavy Machinery Co., Ltd.

TR01 Transfer of patent right