CN109593954A - A kind of manufacturing method of the high-strength sintered mine of low alkalinity - Google Patents
A kind of manufacturing method of the high-strength sintered mine of low alkalinity Download PDFInfo
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- CN109593954A CN109593954A CN201710938571.3A CN201710938571A CN109593954A CN 109593954 A CN109593954 A CN 109593954A CN 201710938571 A CN201710938571 A CN 201710938571A CN 109593954 A CN109593954 A CN 109593954A
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- sinter
- secondary mixing
- dolomite
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- mine
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/02—General features in the manufacture of pig-iron by applying additives, e.g. fluxing agents
-
- 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
- C22B1/24—Binding; Briquetting ; Granulating
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of manufacturing methods of the high-strength sintered mine of low alkalinity, mainly solve the high technical problem of the manufacturing cost of the high-strength sintered mine of high-grade in the prior art.The technical solution adopted by the present invention is that a kind of manufacturing method of the high-strength sintered mine of low alkalinity, comprising: 1) configure magnesian flux；2) ingredient weighs be sintered iron ore and magnesian flux used according to the proportion, controls the dual alkalinity R of sinter2For 1.85-1.90, SiO in sinter2Weight percentage be 4.5-4.8%, the weight percentage of MgO is 1.5-1.6%；3) it mixes and is granulated, primary mix is expected to be transferred in secondary mixing roller to carry out mixing granulation, the secondary mixing material obtained after granulation；4) secondary mixing is expected to carry out down draft sintering, finished product sinter is obtained after the completion of sintering.The present invention realizes the high-strength sintered mine production of low alkalinity, thereby reduces blast furnace ironmaking cost.
Description
Technical field
The present invention relates to the manufacturing method of blast furnace ironmaking raw material sinter, in particular to a kind of high-strength sintered mine of low alkalinity
Manufacturing method, belong to Ferrous Metallurgy sintering technology field.
Background technique
Sinter is one of the main iron-bearing material of the current blast furnace ironmaking in China, and high-grade and high-strength sintered mine are blast furnaces
Smelt the important source material technical guarantee for obtaining excellent technique economic indicator.And in conventional sintering production process, it is suitable in order to obtain
Sinter strength, need to control higher SiO2Content and basicity, the SiO in general control sinter2Content 5.0% with
On, for basicity 1.95 or more, this undoubtedly hinders further increasing for grade of sinter.Moreover, because the basicity mistake of sinter
Height, needed again in blast furnace process in addition addition acidic flux wanted with superfluous CaO with meeting blast furnace slag making during such as silica comes
It asks, this undoubtedly will increase blast furnace ironmaking slag ratio, increases so as to cause ironmaking energy consumption, is also unfavorable for the stable smooth operation of the working of a furnace, finally
Influence blast-furnace technique economic indicator.Theory and practice proves: blast furnace feeding sinter Iron grade decline 1%, fuel ratio increases
1.5%, yield decline 2.5%, ton scum amount increases 30kg/t, and blast furnace coal is than decline 15kg/t.If blast furnace is without using additional
Acidic flux, but in order to cooperate the use of high basicity sinter it is necessary to increase the use ratio of acidic pellet ore, pellet at
This general cost for being all much higher than sinter, still will lead to the raising of blast furnace ironmaking cost.
Summary of the invention
The object of the present invention is to provide a kind of manufacturing methods of the high-strength sintered mine of low alkalinity, mainly solve in the prior art
The high technical problem of the manufacturing cost of the high-strength sintered mine of high-grade；The method of the present invention is improved by suitably reducing sinter basicity
Iron grade, and can guarantee that sinter has good intensity index, meet modern blast furnace production technology demand.
The technical solution adopted by the present invention is that a kind of manufacturing method of the high-strength sintered mine of low alkalinity, comprising the following steps:
1) magnesian flux is configured, dolomite is crushed with ball mill, controls partial size≤2.5mm of dolomite, partial size
The dolomite mass ratio of≤2mm accounts for 80% or more of dolomite gross mass；The weight percent of dolomite constituent is
CaCO3: 52~62%, MgCO3: 37-47%, surplus are inevitable impurity；
2) ingredient weighs be sintered iron ore and magnesian flux used according to the proportion, controls the dual alkalinity R of sinter2For
1.85-1.90 SiO in sinter2Weight percentage be 4.5-4.8%, the weight percentage of MgO is 1.5-1.6%；
3) it mixes and is granulated, the iron ore and magnesian flux prepared is fitted into a mixed roller and is once mixed, primary to mix
It adds water and stirs in the process, obtains once mixing material after mixing, it is primary to mix H in material2The weight percentage of O is 6.0-6.3%；
Primary mix is expected to be transferred in secondary mixing roller to carry out mixing granulation, the secondary mixing material obtained after granulation；
4) secondary mixing is expected to carry out down draft sintering, secondary mixing material is transported to pallet and carries out down draft sintering, is burnt
Finished product sinter is obtained after the completion of knot.
The dual alkalinity R of the sinter of the method for the present invention production2For 1.85-1.90, SiO in sinter2Weight percent contain
Amount is 4.5-4.8%, and the weight percentage of MgO is 1.5-1.6%；TI intensity >=81%；
The dual alkalinity R of sinter of the present invention2For mCaO/mSiO2, mCaOFor the quality of CaO in sinter, mSiO2For
SiO in sinter2Quality.
The method of the present invention is based on following experimental study: when the dual alkalinity and SiO of sinter2When reduction, sintering will affect
The main binding phase calcium ferrite CaOFe of mine2O3And the generation of glass phase, reduce the intensity of sinter；And content of MgO is excessively high
When, MgO can generate magnesium ferrite MgOFe with ferriferous oxide2O3, also influence the combination generation reduction calcium ferrite of CaO and ferriferous oxide
Production quantity.In addition, laboratory research shows: when in sintering process with addition of CaO, liquid phase generative capacity is significantly greater than with addition of MgO
Flux, because Liquid phase flowability is poor when with addition of MgO flux, the reason is that: CaOFe2O3Fusing point it is lower, at 1200 DEG C
Roasting can have liquid phase generation；And MgOFe2O3It is a kind of solid solution, without definite melting point, molten temperature region is relatively high,
Aneroid is roasted at 1200 DEG C mutually to generate.CaOFe simultaneously2O3Self-strength be higher than MgOFe2O3: at 1150 DEG C, CaO
Fe2O3Compression strength be 0.95kN, MgOFe2O3Compression strength be 0.74kN；At 1180 DEG C, CaOFe2O3Resistance to compression
Intensity is 1.18kN, MgOFe2O3Compression strength be 0.85kN, the magnesium ferrite intensity at a temperature of two kinds is all lower than calcium ferrite
30% or more, so being based on the studies above mechanism, the appropriate content of MgO reduced in sinter can improve the intensity of sinter,
Mitigating reduces sinter basicity and SiO2The brought negative effect to intensity.In the present invention, it is thin that MgO flux dolomite will be contained
It is milled to 0-2.5mm, the reason is that fine grinding there can be the specific surface area for increasing flux, improves the CaO in dolomite in sintering process
In with the catalytic efficiency of ferriferous oxide, improve the formation condition of calcium ferrite, generation quantity improved, to improve sinter
Intensity.
The present invention has following good effect compared with prior art: 1, the present invention is by suitably reducing the alkali in sinter
Degree, SiO2And MgO can effectively improve Iron grade.2, with the content of MgO suitably reduced in sinter excessively, low-intensity ferrous acid is reduced
The generation of magnesium promotes the generation of calcium ferrite, can improve the intensity of sinter, mitigates basicity and SiO2Reduction brought by burning
Tie the negative effect of mine intensity.3, by fine grinding dolomite flux containing MgO, the CaO ingredient in flux can be made full use of, is improved
Main binding phase calcium ferrite production quantity improves sinter strength.4, the method for the present invention simple process, it is easy to accomplish.
Specific embodiment
The present invention is further described combined with specific embodiments below.
Embodiment 1, a kind of manufacturing method of the high-strength sintered mine of low alkalinity, comprising the following steps:
1) magnesian flux is configured, dolomite is crushed with ball mill, controls partial size≤2.5mm of dolomite, partial size
The dolomite mass ratio of≤2mm accounts for 80% or more of dolomite gross mass；The weight percent of dolomite constituent is
CaCO3: 52~62%, MgCO3: 37-47%, surplus are inevitable impurity；
2) ingredient weighs be sintered iron ore and magnesian flux used according to the proportion, controls the dual alkalinity R of sinter2For
1.85, SiO in sinter2Weight percentage be 4.72%, MgO weight percentage be 1.5%；
3) it mixes and is granulated, the iron ore and magnesian flux prepared is fitted into a mixed roller and is once mixed, primary to mix
It adds water and stirs in the process, obtains once mixing material after mixing, it is primary to mix H in material2The weight percentage of O is 6.1%；By one
Secondary mixing material, which is transferred in secondary mixing roller, carries out mixing granulation, the secondary mixing material obtained after granulation；
4) secondary mixing is expected to carry out down draft sintering, secondary mixing material is transported to pallet and carries out down draft sintering, is burnt
Finished product sinter is obtained after the completion of knot.
Quality testings, the qualitative datas of 1 sinter of embodiment such as Iron grade, intensity is carried out to 1 sinter of embodiment to be shown in Table
1。
The qualitative data of 1 embodiment of the present invention of table, 1 sinter
| Classification | Iron grade/% | TI intensity/% | SiO2/ % | MgO/% | Dual alkalinity R2 |
| Embodiment 1 | 58.1 | 82.36 | 4.72 | 1.50 | 1.85 |
| Existing common process | 57.5 | 81.45 | 4.96 | 1.65 | 1.93 |
As shown in Table 1: rising 0.6 percentage point using sinter Iron grade produced after the present invention, intensity improves
0.91 percentage point, comprehensive quality is obviously improved, and after blast furnace use, is conducive to the raising of blast-furnace technique economic indicator, can create
Make significant economic benefit.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (2)
1. a kind of manufacturing method of the high-strength sintered mine of low alkalinity, characterized in that method includes the following steps:
1) magnesian flux is configured, dolomite is crushed with ball mill, controls partial size≤2.5mm of dolomite, partial size≤2mm
Dolomite mass ratio account for 80% or more of dolomite gross mass；The weight percent of dolomite constituent is CaCO3: 52
~62%, MgCO3: 37-47%, surplus are inevitable impurity；
2) ingredient weighs be sintered iron ore and magnesian flux used according to the proportion, controls the dual alkalinity R of sinter2For 1.85-
1.90, SiO in sinter2Weight percentage be 4.5-4.8%, the weight percentage of MgO is 1.5-1.6%；
3) it mixes and is granulated, the iron ore and magnesian flux prepared is fitted into a mixed roller and is once mixed, a blending process
In add water and stir, obtain once mixing material after mixing, it is primary to mix H in material2The weight percentage of O is 6.0-6.3%；By one
Secondary mixing material, which is transferred in secondary mixing roller, carries out mixing granulation, the secondary mixing material obtained after granulation；
4) secondary mixing is expected to carry out down draft sintering, secondary mixing material is transported to pallet and carries out down draft sintering, has been sintered
Finished product sinter is obtained after.
2. a kind of manufacturing method of the high-strength sintered mine of low alkalinity as described in claim 1, characterized in that described in step 4)
TI intensity >=80% of finished product sinter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938571.3A CN109593954A (en) | 2017-09-30 | 2017-09-30 | A kind of manufacturing method of the high-strength sintered mine of low alkalinity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710938571.3A CN109593954A (en) | 2017-09-30 | 2017-09-30 | A kind of manufacturing method of the high-strength sintered mine of low alkalinity |
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| CN109593954A true CN109593954A (en) | 2019-04-09 |
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| CN201710938571.3A Pending CN109593954A (en) | 2017-09-30 | 2017-09-30 | A kind of manufacturing method of the high-strength sintered mine of low alkalinity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112824547A (en) * | 2019-11-21 | 2021-05-21 | 上海梅山钢铁股份有限公司 | Method for producing sintered ore from high-alumina iron ore powder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962897A (en) * | 2006-11-30 | 2007-05-16 | 武汉钢铁(集团)公司 | Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same |
| CN102127636A (en) * | 2010-12-30 | 2011-07-20 | 首钢总公司 | Method for preparing low-SiO2 high-performance sinter ore |
| CN102417974A (en) * | 2011-12-09 | 2012-04-18 | 内蒙古包钢钢联股份有限公司 | Preparation method of fluorine-containing low-silicon sintering ore |
| CN103572043A (en) * | 2012-07-25 | 2014-02-12 | 上海梅山钢铁股份有限公司 | Production method of agglomerate with low alkalinity |
-
2017
- 2017-09-30 CN CN201710938571.3A patent/CN109593954A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962897A (en) * | 2006-11-30 | 2007-05-16 | 武汉钢铁(集团)公司 | Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same |
| CN102127636A (en) * | 2010-12-30 | 2011-07-20 | 首钢总公司 | Method for preparing low-SiO2 high-performance sinter ore |
| CN102417974A (en) * | 2011-12-09 | 2012-04-18 | 内蒙古包钢钢联股份有限公司 | Preparation method of fluorine-containing low-silicon sintering ore |
| CN103572043A (en) * | 2012-07-25 | 2014-02-12 | 上海梅山钢铁股份有限公司 | Production method of agglomerate with low alkalinity |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112824547A (en) * | 2019-11-21 | 2021-05-21 | 上海梅山钢铁股份有限公司 | Method for producing sintered ore from high-alumina iron ore powder |
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Application publication date: 20190409 |
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