CN104480297A - Sintered ore gradient alkalinity control method - Google Patents

Sintered ore gradient alkalinity control method Download PDF

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Publication number
CN104480297A
CN104480297A CN201410692135.9A CN201410692135A CN104480297A CN 104480297 A CN104480297 A CN 104480297A CN 201410692135 A CN201410692135 A CN 201410692135A CN 104480297 A CN104480297 A CN 104480297A
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cao
sintering
burn
slag
basicity
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徐圣
汪玉来
赵耀辉
贾菁菁
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Tianjin Iron and Steel Group Co Ltd
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Tianjin Iron and Steel Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a sintered ore gradient alkalinity control method which comprises the following steps of: calculating to obtain the CaO sintering contained in the sintered ore according to that effective calcium oxide CaO effective contained in the sintered ore and blast furnace slag alkalinity R slag are quantitative, according to the SiO2 content SiO2 sintering of ore powder and according to a formula CaO sintering=SiO2 sintering*R slag+CaO effective, and then calculating the addition amount of a fusing agent according to the CaO content of the fusing agent; changing the control index R sintering of sintering to the R slag and the CaO effective; changing a regulation method from regulating according to R sintering unchangeableness to regulate according to R slag and CaO effective unchangeableness, and forming the gradient change of the R sintering according to the height of the SiO2 sintering. According to the sintered ore gradient alkalinity control method, theoretically, the R sintering is variable, and the CaO effective is quantitative; a sintered ore gradient alkalinity control standard is executed, so that the target of sintering production is changed from stabilizing sintered ore alkalinity to stabilize blast furnace slag alkalinity and a blast furnace material structure; when the SiO2 content is greatly fluctuated in sintering production, the regulation intensity of the proportion of the fusing agent can be reduced, and the blast furnace material structure tends to be more stable and can not cause artificial adverse effects by being repeatedly regulated.

Description

A kind of agglomerate gradient basicity control method
Technical field
The present invention relates to sinter basicity control method, specifically, is a kind of agglomerate gradient basicity control method.
Background technology
Current each steel enterprise sintering ore deposit is all by fixing target basicity (sinter basicity R burn) carry out daily adjustment, adopt formula: sinter basicity R burn=CaO burn/ SiO 2 burn, CaO burnfor the content of CaO in agglomerate, namely require that operator are according to the SiO of agglomerate 2content (SiO 2 burn) and fixing target basicity (sinter basicity R burn) adjust, strive that the basicity making agglomerate is stablized.The advantage of this operation policy is that Action Target is simply clear and definite, at agglomerate SiO 2without any problem during stable content.But as agglomerate SiO 2when content is larger, in order to make sinter basicity stablize, need the proportional quantity significantly adjusting flux, at this moment due to blast-furnace slag basicity (the blast-furnace slag basicity R of blast furnace slagcaO in=blast-furnace slag slag/ SiO 2 slags) and sinter basicity interval there is gap, effective CaO content in agglomerate (according to blast-furnace slag alkalinity demand, deduction agglomerate self SiO 2residue CaO content after required CaO quantity) can change, and then make blast furnace be forced to carry out the adjustment of burden structure thereupon, thus produce unnecessary excessive adjustment, be unfavorable for the stable smooth operation of blast furnace, cause the waste of flux simultaneously.
Existing agglomerate gradient basicity control method: according to sinter basicity adjustment, namely fix R burnconstant, sintering operation personnel are according to the SiO in breeze 2content, calculates the CaO quantity needed, makes CaO burn=SiO 2 burn× R burn, and then according to the CaO content in flux carry out calculate flux with addition of amount.This kind of inflation method R in theory burnquantitative, CaO effectivelyit is variable.Because blast furnace is in order to ensure the stable of blast-furnace slag basicity, the need of adjustment burden structure and CaO effectivelydependency is higher, so blast furnace needs frequently to adjust burden structure, is unfavorable for stablizing of blast furnace and stablizing of molten steel quality.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of by fixing R slag, CaO effectively, according to R burnwith SiO 2 burnheight form graded and control the method for agglomerate gradient basicity.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of agglomerate gradient basicity control method, according to the efficient oxidation calcium CaO in agglomerate effectivelywith blast-furnace slag basicity R slagquantitative, according to the SiO in breeze 2content SiO 2 burn, according to formula CaO burn=SiO 2 burn× R slag+ CaO effectively, calculate CaO in agglomerate burn, then according to the CaO content in flux carry out calculate flux with addition of amount.
According to the SiO in breeze 2content SiO 2 burndifference, fixing effective calcium oxide CaO effectivelywith blast-furnace slag basicity R slag, calculate corresponding CaO burn, row SiO 2 burncorresponding CaO burnform.
The invention has the beneficial effects as follows: by the Con trolling index R of sintering burnchange R into slagand CaO effectively.Inflation method is from pressing R burnconstantly to adjust, change into by R slag, CaO effectivelyconstant, R burnaccording to SiO 2 burnheight formed graded.R on theoretical method of the present invention burnvariable, CaO effectivelyquantitative.Therefore blast furnace does not need frequently to adjust burden structure, can ensure the stable of blast-furnace slag basicity, and then stable molten steel quality.Carry out agglomerate gradient basicity control criterion, the target of SINTERING PRODUCTION is no longer stabilized sinter basicity, but changes the burden structure of stable blast-furnace slag basicity and blast furnace into.As SiO in SINTERING PRODUCTION 2when content fluctuation is larger, the adjustment dynamics of flux proportioning can reduce to some extent, makes the burden structure of blast furnace more tend towards stability simultaneously, need not repeatedly adjust, cause artificial detrimentally affect.
Embodiment
Agglomerate gradient basicity control method of the present invention, according to the efficient oxidation calcium CaO in agglomerate effectivelywith blast-furnace slag basicity R slagquantitative, according to the SiO in breeze 2content SiO 2 burn, according to formula CaO burn=SiO 2 burn× R slag+ CaO effectively, calculate CaO in agglomerate burn, then according to the CaO content in flux carry out calculate flux with addition of amount.
According to the SiO in breeze 2content SiO 2 burndifference, fixing effective calcium oxide CaO effectivelywith blast-furnace slag basicity R slag, calculate corresponding CaO burn, row SiO 2 burncorresponding CaO burnform.
Sinter basicity R burn: CaO in agglomerate burn/ SiO 2 burn
Blast-furnace slag basicity R slag: CaO in blast-furnace slag slag/ SiO 2 slags
The efficient oxidation calcium: CaO in agglomerate effectively=CaO burn-SiO 2 burn× R slag=CaO burn-SiO 2 burn× CaO slag/ SiO 2 slags=SiO 2 burn× R burn-SiO 2 burn× R slag=SiO 2 burn(R burn-R slag)
Below in conjunction with embodiment, the present invention is described in further detail:
One, ensure that sintering production process is stablized.Such as: SiO in the normal production of sintering 2content SiO 2 burnbe 6.0%, CaO content CaO burnbe 11.10%, target basicity R burnwhen being 1.85.Due to sampling, sample preparation deviation, the agglomerate SiO that actual laboratory is chemically examined out 2content SiO 2 burnfluctuate between 5.8%-6.2%, if fixing basicity control criterion traditionally, sintering work personnel should control the target CaO content CaO in agglomerate burnfor 10.73%-11.47%, span of control is excessive, and basicity height is useless or low useless very easily to cause agglomerate appearance to occur.Sinter basicity qualification rate and the ratio of first-grade products are significantly reduced.If controlled according to gradient basicity control method of the present invention, sintering work personnel should control the target CaO content CaO in agglomerate burnfor 10.87%-11.33%, less than traditional method adjustment CaO content range, both can reduce the adjustment amount of flux limestone powder, the stable of production can be ensured again.
Two, sinter basicity qualification rate and the ratio of first-grade products is improved.Due to the uncertainty of single appearance, in sampling, sample making course, there will be deviation.When there is certain inclined sample, such as: agglomerate appearance SiO 2content SiO 2 burnsuddenly 6.5% is jumped to by 6.0%, if fixing basicity control criterion traditionally, target CaO content CaO burnthe adjusting range that then should become 12.03%, CaO content from 11.10% is accordingly 0.97%.Adjusting range is very large, when next appearance returns to again normal SiO 2during content 6.0%, will significantly adjust equally, basicity height is useless or low useless very easily to cause agglomerate to occur, makes sinter basicity qualification rate and the ratio of first-grade products reduce and can cause the instability of sinter basicity.And after carrying out gradient basicity control methods of the present invention, target CaO content CaO burnonly need the adjusting range adjusting to 11.68%, CaO content to be 0.58%, be only equivalent to the half of traditional basicity control method adjustment amount, even and if next agglomerate appearance SiO 2content returns to again normal 6.0%, also can ensure in maximum range that agglomerate is salable product or first grade, greatly reduces the probability occurring sintering basicity waste product, ensures the stable smooth operation produced.
Three, reduce the fluctuation of blast furnace basicity, be conducive to smooth operation of furnace.For example, traditionally basicity adjustment way, agglomerate target basicity R burnwhen being 1.85, as agglomerate SiO originally 2content SiO 2 burnwhen being 6.0%, at this moment sintering controls the target CaO content CaO in agglomerate burnbe 11.10%, if blast-furnace slag basicity R slagbe 1.15, then the effective CaO content CaO that provides for blast furnace of unit agglomerate effectivelyit is 6.0% × (1.85-1.15)=4.2%; When sintering is because of breeze composition transfer SiO 2when content becomes 7.0%, at this moment sintering controls the target CaO content CaO in agglomerate burnbe 12.95%, then the effective CaO content CaO that provides for blast furnace of unit agglomerate effectivelybe 7.0% × (1.85-1.15)=4.9%, the effective CaO content that unit agglomerate provides adds 0.7%, and blast furnace, in order to balance blast-furnace slag basicity, must increase acidic flux to neutralize this effective CaO content of additional 0.7%.Such as initial blast furnace proportioning is: agglomerate 80%+PB block 12%+ coulomb block 8%, as the SiO in agglomerate 2when content becomes 7.0%, CaO content is 12.95%, blast furnace must calculate the proportioning of adjustment agglomerate and lump ore by becoming material list, or with addition of silica, proportioning be adjusted to: agglomerate 78%+PB block 12%+ coulomb block 10%, and subsidiary silica 130kg/ criticizes, (referring to table 1, table 2) adjusting range is huge, when lime stone negative is identical, represent that blast furnace blast-furnace slag basicity is constant.As can be seen from table 1, table 2, agglomerate SiO 2during content 1%, blast furnace needs corresponding increase by 2% high silicon coulomb block ratio, reduces by the agglomerate ratio of 2%, and needs the silica that additional 130kg/ criticizes.Visible adjusting range is huge.
Table 1 becomes material list (agglomerate 80%+PB block 12%+ coulomb block 8%)
Table 2 becomes material list (agglomerate 78%+PB block 12%+ coulomb block 10%+ silica 130kg/ criticizes)
Meanwhile, the acidic flux increased can cause again the reduction of blast furnace feeding grade and fuel ratio to raise more.And if blast furnace is delayed to sintering basicity change adjustment, also can causes the fluctuation of blast-furnace slag basicity, even cause conditions of blast furnace to fluctuate.And if after carrying out agglomerate gradient basicity control method of the present invention, because agglomerate gradient basicity control criterion is with stable effective CaO for target, as agglomerate target basicity R burnwhen being 1.85, as agglomerate SiO originally 2when content is 6.0%, at this moment sintering controls the target CaO content R in agglomerate burnbe 11.10%, if blast furnace blast-furnace slag basicity R slagbe 1.15, then the effective CaO content CaO that provides for blast furnace of unit agglomerate effectivelyit is 6.0% × (1.85-1.15)=4.2%; When sintering is because of breeze composition transfer SiO 2when content becomes 7.0%, control effective CaO content according to agglomerate gradient basicity constant, then at this moment sintering controls the target CaO content CaO in agglomerate effectivelythen correspondingly become 7.0% × 1.15+4.2%=12.25%, the effective CaO content of taking to blast furnace due to unit agglomerate is constant, is still 4.2%, so blast furnace does not need the adjustment carrying out flux amount, namely blast furnace does not need the proportioning adjusting agglomerate and lump ore, continues stable production.
For example, assuming that agglomerate SiO originally 2content is 6.0%, target basicity R burnbe 1.85 times, at this moment sintering work personnel should control the target CaO content CaO in agglomerate burnbe 11.10%, when sintering is because of breeze composition transfer SiO 2when content becomes 7.0%, if fixing basicity control criterion traditionally, target CaO content CaO burnthen correspondingly become 12.95%, sintering operation personnel can increase limestone powder proportioning 2.9%, and blast furnace can adjust the proportioning of agglomerate and lump ore simultaneously, or with addition of silica.
If but according to the concept of gradient basicity, blast-furnace slag basicity R slagbe 1.15, SiO 2content is 6.0%, target basicity R burnwhen being 1.85, effective CaO content is 6.0% × 1.85-6.0% × 1.15=4.2%, when sintering is because of breeze composition transfer SiO 2when content becomes 7.0%, target CaO content CaO burnthen correspondingly become 7.0% × 1.15+4.2%=12.25%, only need to increase limestone powder proportioning 1.8%, the flux amount of allocating into can reduce by 1.1%, and blast furnace does not need the proportioning of adjustment agglomerate and lump ore, continues stable production.Vice versa.
Table 1 agglomerate gradient basicity and fixing basicity contrast table
After carrying out the control of gradient basicity, during iron work production technology section notice sintering adjustment basicity, no longer simple notice sintering controls basicity from how much adjusting to how many, but determine gradient basicity table according to the basicity of blast-furnace slag needs and the acidity of acid burden material, assign to sintering work district operator.As, blast furnace blast-furnace slag basicity needs to adjust to 1.20 from 1.15, and lump ore acidity increases, and effective CaO needs to bring up to 4.4% from 4.2%.Then issue basicity table as table 2:
Table 2 gradient basicity control criterion list of modification
Sintering work personnel in SINTERING PRODUCTION, according to the SiO of agglomerate 2content is carried out tabling look-up and is determined to need the CaO standard value of control, carries out the adjustment of corresponding dynamics.
After agglomerate gradient basicity control methods is implemented, blast furnace does not need to be forced to significantly adjust burden structure because of the change of sintering basicity, is more conducive to the stable smooth operation of blast furnace, decreases the waste of flux simultaneously.
According to the efficient oxidation calcium in agglomerate and the adjustment of blast-furnace slag basicity, namely fix R slagand CaO effectivelyconstant, sintering operation personnel are according to the SiO in breeze 2content makes CaO according to new formula burn=SiO 2 burn× R slag+ CaO have effect, i.e. math equation y=k 2x+b, so according to the CaO content in flux carry out calculate flux with addition of amount.This kind of inflation method R in theory burnvariable, CaO effectivelyquantitative.Therefore blast furnace does not need frequently to adjust burden structure, can ensure the stable of blast-furnace slag basicity, and then stable molten steel quality.
By the Con trolling index R of sintering burnchange R into slagand CaO effectively.Inflation method is from pressing R burnconstantly to adjust, change into by R slag, CaO effectivelyconstant R burnaccording to SiO 2 burnheight formed graded.
Above-described embodiment is only for illustration of technological thought of the present invention and feature, its object is to enable those skilled in the art understand content of the present invention and implement according to this, only can not limit the scope of the claims of the present invention with the present embodiment, namely the equal change done of all disclosed spirit or modification, still drop in the scope of the claims of the present invention.

Claims (2)

1. an agglomerate gradient basicity control method, is characterized in that, according to the efficient oxidation calcium CaO in agglomerate effectivelywith blast-furnace slag basicity R slagquantitative, according to the SiO in breeze 2content SiO 2 burn, according to formula CaO burn=SiO 2 burn× R slag+ CaO effectively, calculate CaO in agglomerate burn, then according to the CaO content in flux carry out calculate flux with addition of amount.
2. agglomerate gradient basicity control method according to claim 1, is characterized in that, according to the SiO in breeze 2content SiO 2 burndifference, fixing effective calcium oxide CaO effectivelywith blast-furnace slag basicity R slag, calculate corresponding CaO burn, row SiO 2 burncorresponding CaO burnform.
CN201410692135.9A 2014-11-25 2014-11-25 Sintered ore gradient alkalinity control method Pending CN104480297A (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN105861817A (en) * 2016-05-18 2016-08-17 武汉钢铁股份有限公司 Method for researching flux distribution state in sintered mixed granulates
CN107703743A (en) * 2017-09-15 2018-02-16 首钢京唐钢铁联合有限责任公司 Automatic control method for alkalinity of sinter
CN115125338A (en) * 2021-03-29 2022-09-30 宝山钢铁股份有限公司 Online adjusting method and system for quality of sinter

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105861817A (en) * 2016-05-18 2016-08-17 武汉钢铁股份有限公司 Method for researching flux distribution state in sintered mixed granulates
CN105861817B (en) * 2016-05-18 2017-10-24 武汉钢铁有限公司 A kind of method for studying flux distribution in sintered compound granulation
CN107703743A (en) * 2017-09-15 2018-02-16 首钢京唐钢铁联合有限责任公司 Automatic control method for alkalinity of sinter
CN115125338A (en) * 2021-03-29 2022-09-30 宝山钢铁股份有限公司 Online adjusting method and system for quality of sinter
CN115125338B (en) * 2021-03-29 2023-08-11 宝山钢铁股份有限公司 Sinter quality online adjustment method and system

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Application publication date: 20150401