CN106498150A - A kind of method for improving calcium ferrite reproducibility - Google Patents
A kind of method for improving calcium ferrite reproducibility Download PDFInfo
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- CN106498150A CN106498150A CN201611088982.XA CN201611088982A CN106498150A CN 106498150 A CN106498150 A CN 106498150A CN 201611088982 A CN201611088982 A CN 201611088982A CN 106498150 A CN106498150 A CN 106498150A
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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
- C22B1/02—Roasting processes
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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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Abstract
The present invention relates to a kind of method for improving calcium ferrite reproducibility, comprises the steps：S1：Mixing, calcium carbonate, di-iron trioxide and silica are uniformly mixed, and wherein, calcium carbonate, the mol ratio of di-iron trioxide are 1:1, the mass fraction for accounting for mixture of silica is 7% 9%；S2：Briquetting, by S1, uniformly mixed sample is pressed into cylinder bulk sample with pressure-like machine；S3：Roasting, the cylinder bulk sample that S2 is made are placed in high temperature silicon molybdenum stove and heat, and air atmosphere rises to 900 DEG C from room temperature, are incubated 1 hour so that calcium carbonate fully resolves into calcium oxide；1200 DEG C are continuously heating to, then constant temperature 8 10 hours cool down, vibration powdering.The method for strengthening the external factor of calcium ferrite reduction degree compared to temperature raising etc., control dioxide-containing silica is fundamentally to improve its reproducibility, has both been readily produced operation, also energy saving, reduced cost.
Description
Technical field
A kind of the present invention relates to metallurgical engineering technical field, more particularly to method for improving calcium ferrite reproducibility.
Background technology
Sintering deposit is one of most important raw material of blast furnace ironmaking, and in blast furnace burden proportion up to more than 70%, its reproducibility refers to
Mark is the direct reflection of blast furnace energy consumption height, and Well-recovered sintering deposit can effectively reduce blast furnace fuel ratio, and this is to whole iron and steel
Long flow process energy-saving and emission-reduction are significant., used as the most important bonding phase constituent of high basicity sinter now, which is also for calcium ferrite
The impact that the raising of originality reduces index to sintering deposit is the most direct.
Strengthen calcium ferrite reproducibility in sintering deposit, it is relatively straightforward mode to improve temperature, but the thing followed is to need
More energy are provided, cost is improved.Secondly, increasing reducing atmosphere concentration in sintering process can also make to produce more in liquid phase
Many low price ferriferous oxides, overall reproducibility are improved, but operable not strong, and also need additionally to increase fuel ratio.
Content of the invention
For the problems referred to above that prior art is present, it is an object of the invention to provide a kind of side for improving calcium ferrite reproducibility
Method.
For achieving the above object, the present invention is adopted the following technical scheme that：A kind of method for improving calcium ferrite reproducibility, including
Following steps：
S1：Mixing, calcium carbonate, di-iron trioxide and silica are uniformly mixed, wherein, calcium carbonate, di-iron trioxide
Mol ratio be 1:1, the mass fraction for accounting for mixture of silica is 7%-9%；
S2：Briquetting, by S1, uniformly mixed sample is pressed into cylinder bulk sample with pressure-like machine；
S3：Roasting, the cylinder bulk sample that S2 is made are placed in high temperature silicon molybdenum stove and heat, and air atmosphere, from room
Temperature rise is incubated 1 hour so that calcium carbonate fully resolves into calcium oxide to 900 DEG C；1200 DEG C are continuously heating to, constant temperature 8-10 is little
When, then cool down, vibration powdering.
Used as optimization, in the S1, calcium carbonate, di-iron trioxide and silica purity are more than 99.99%.High-purity original
Material is selected, it is ensured that the chemical reaction of follow-up roasting link more fully completely, X-ray diffraction thing is mutually detected in semi-quantitative results
Show, the production rate of pure calcium ferrite can reach more than 95%.And prove as a comparison, operation analysis pure reagent (material purity
99%) the calcium ferrite sample for preparing, production rate can only achieve 85%.
Used as optimization, in the S2, the pressure of pressure-like machine is 10Mpa.Select the pressure compacting powdery samples Cheng Yuan of 10Mpa
Column, also on the premise of ensureing that sample is fully reacted in roasting process, is unlikely in sintering procedure because excessively
Consolidation relaxes and thermofission.Calcined sample under 10Mpa pressure can ensure that good integrity degree.
Used as optimization, in the S2, by S1, uniformly mixed sample makes diameter 1cm, the cylinder bulk sample of high 1cm
Product.The compacting sample of such size shape, is unlikely to because sample size obtained from too small is unlikely to excessive very little, also and causes
In roasting process, chemical reaction is not abundant enough.
Used as optimization, the sample vibration in the S3 by roasting after complete is into the powder below 100 mesh.In follow-up thermogravimetric reality
Test the degree of reaction of middle detection sample, the granule size of sample plays key effect, 100 about 74 μm of mesh granularity sizes, so
Particle size range can give sample and keep good dynamic conditions in gas-solid phase reduction process.Additionally, in blast fumance
During, the reduction process of fine-powdered furnace charge is seldom studied, and the present invention is carried out under sample fine powder state, and as this
Supplement in terms of individual research.
Relative to prior art, the invention has the advantages that：
1st, the method for strengthening the external factor of calcium ferrite reduction degree compared to temperature raising etc., controlling dioxide-containing silica is
Its reproducibility is fundamentally improved, operation has both been readily produced, also energy saving, reduced cost.
2nd, silica itself is the important chemical composition of sintering deposit, by obtaining its content control in certain level
Optimum reducing power, does not interfere with the overall permanence of sintering deposit, can also obtain target by the content for adjusting calcium oxide
High-quality Sinters in alkalinity ranges.
3rd, add in the present invention after the silica of content range 7%-9%, the reproducibility of calcium ferrite is not only improved,
And the recovery time greatly reduces, pure iron acid calcium reduction was for up to 80 minutes, and passed through the silica given with addition of the present invention
Content, recovery time can be reduced to 58 minutes, i.e., reduction efficiency is greatly enhanced.It is applied in industrial production, blast furnace ironmaking is imitated
Rate can be improved rapidly therewith.
Description of the drawings
Fig. 1 is the inventive method and reproducibility measurement procedure schematic diagram.
Fig. 2 is the thing phase composition of calcium ferrite sample after pure calcium ferrite and the inventive method process.
Specific embodiment
Below the present invention is described in further detail.
The present invention improves, by way of composition is transformed, the di-iron trioxide for being more easy to reduce in calcium ferrite by chemical reaction
The content of composition, with addition of silica in calcium ferrite matrix, which is higher with the binding ability of calcium oxide, it is easy to generate calcium silicates
And di-iron trioxide is more free in calcium ferrite, final calcium ferrite matrix reproducibility is improved.Silica exists
Very few in sintering deposit be difficult to generate sufficient Binder Phase, excessive the problems such as cause the blast furnace quantity of slag to increase sharply again.Therefore dioxy is controlled
SiClx content, i.e. the silica quality fraction range of present invention control, not only do not result in the minimizing of amount of liquid phase, the blast furnace quantity of slag
Increase, can also effectively improve the reproducibility of calcium ferrite.
Referring to Fig. 1, a kind of method of raising calcium ferrite reproducibility, comprise the steps：
S1：Mixing.Prepare sample and be mainly calcium carbonate, di-iron trioxide and silica.Wherein calcium carbonate and three oxidations
Two iron are according to mol ratio 1：1, it is mixed into the silica of mass fraction 7-9%.Three kinds of sample purity are all higher than 99.99%.Uniformly
Composite sample.
S2:Briquetting.Mixed uniformly sample is pressed into diameter 1cm, the circle of high 1cm with pressure-like machine (pressure 10Mpa)
Cylinder bulk sample.
S3. roasting.Sample is placed in high temperature silicon molybdenum stove and is heated, and air atmosphere rises to 900 DEG C from room temperature, is incubated 1 hour,
So that calcium carbonate fully resolves into calcium oxide.1200 DEG C are continuously heating to, constant temperature 10 hours so that fully anti-between sample composition
Should.After sample roasting is completed and is cooled down, vibration powdering (below 100 mesh) sample.
Composition Control is workable to improving calcium ferrite reproducibility, and is easy to carry out in production practices.Silica
And the important chemical composition of sintering deposit, silica of the present invention by interpolation 7%-9% in calcium ferrite, measure reproducibility
Increase than pure calcium ferrite, the recovery time greatly reduces.
Comparative example：Pure iron acid calcium powder sample is prepared, following steps are specifically included：
S1：Mixing.Pure calcium ferrite is prepared, it is calcium carbonate, di-iron trioxide to prepare sample raw material.Calcium carbonate and three oxidations two
Iron is according to mol ratio 1：1, sample mixing gross mass 10g.
S2:Briquetting.Mixed uniformly sample is pressed into diameter 1cm, the circle of high 1cm with pressure-like machine (pressure 10Mpa)
Cylinder bulk sample.
S3. roasting.Sample is placed in high temperature silicon molybdenum stove and is heated, and air atmosphere rises to 900 DEG C from room temperature, is incubated 1 hour,
So that calcium carbonate fully resolves into calcium oxide.1200 DEG C are continuously heating to, constant temperature 10 hours so that fully anti-between sample composition
Should.After sample roasting is completed and is cooled down, vibration powdering (below 100 mesh) sample.
Thermogravimetric analysis.By thermogravimetric analysis detection record pulverized specimen in 30% carbon monoxide and 70% nitrogen mixture
Atmosphere, temperature are to lose quality at 950 DEG C, reach 94% to calculate its reduction degree, 80 minutes recovery times.
Embodiment 1：A kind of method for improving calcium ferrite reproducibility, comprises the steps：
S1：Mixing.It is calcium carbonate, di-iron trioxide and silica to prepare sample raw material.Wherein calcium carbonate and three oxidations
Two iron are according to mol ratio 1：1, it is mixed into the silica of mass fraction 7% respectively.
S2:Briquetting.Mixed uniformly sample is pressed into diameter 1cm, the circle of high 1cm with pressure-like machine (pressure 10Mpa)
Cylinder bulk sample.
S3. roasting.Sample is placed in high temperature silicon molybdenum stove and is heated, and air atmosphere rises to 900 DEG C from room temperature, is incubated 1 hour,
So that calcium carbonate fully resolves into calcium oxide.1200 DEG C are continuously heating to, constant temperature 8 hours so that fully react between sample composition.
After sample roasting is completed and is cooled down, vibration powdering (below 100 mesh) sample.
S4. thermogravimetric.By thermogravimetric analysis detection record pulverized specimen in 30% carbon monoxide and 70% nitrogen mixture atmosphere,
Temperature is to lose quality at 950 DEG C, reaches 96% to calculate its reduction degree, 65 minutes recovery times.
Embodiment 2：A kind of method for improving calcium ferrite reproducibility, comprises the steps：
S1：Mixing.It is calcium carbonate, di-iron trioxide and silica to prepare sample raw material.Wherein calcium carbonate and three oxidations
Two iron are according to mol ratio 1：1, it is mixed into the silica of mass fraction 8% respectively.
S2:Briquetting.Mixed uniformly sample is pressed into diameter 1cm, the circle of high 1cm with pressure-like machine (pressure 10Mpa)
Cylinder bulk sample.
S3. roasting.Sample is placed in high temperature silicon molybdenum stove and is heated, and air atmosphere rises to 900 DEG C from room temperature, is incubated 1 hour,
So that calcium carbonate fully resolves into calcium oxide.1200 DEG C are continuously heating to, constant temperature 9 hours so that fully react between sample composition.
After sample roasting is completed and is cooled down, vibration powdering (below 100 mesh) sample.
S4. thermogravimetric.By thermogravimetric analysis detection record pulverized specimen in 30% carbon monoxide and 70% nitrogen mixture atmosphere,
Temperature is to lose quality at 950 DEG C, reaches 98% to calculate its reduction degree, 60 minutes recovery times.
Embodiment 3：A kind of method for improving calcium ferrite reproducibility, comprises the steps：
S1：Mixing.It is calcium carbonate, di-iron trioxide and silica to prepare sample raw material.Wherein calcium carbonate and three oxidations
Two iron are according to mol ratio 1：1, it is mixed into the silica of mass fraction 9% respectively.
S2:Briquetting.Mixed uniformly sample is pressed into diameter 1cm, the circle of high 1cm with pressure-like machine (pressure 10Mpa)
Cylinder bulk sample.
S3. roasting.Sample is placed in high temperature silicon molybdenum stove and is heated, and air atmosphere rises to 900 DEG C from room temperature, is incubated 1 hour,
So that calcium carbonate fully resolves into calcium oxide.1200 DEG C are continuously heating to, constant temperature 10 hours so that fully anti-between sample composition
Should.After sample roasting is completed and is cooled down, vibration powdering (below 100 mesh) sample.
S4. thermogravimetric.By thermogravimetric analysis detection record pulverized specimen in 30% carbon monoxide and 70% nitrogen mixture atmosphere,
Temperature is to lose quality at 950 DEG C, reaches 98% to calculate its reduction degree, 58 minutes recovery times.
Thing phase composition
Thing phase composition with X-ray diffraction characterized by techniques powdery calcined sample.It was found that with addition of 7%-9% silica
Calcium ferrite occurs in that more ferric oxide compositions compared to un-added pure calcium ferrite in thing phase composition, this is final promotion
The most basic reason that its reduction degree is improved.
Thermogravimetric analysis
In thermogravimetric analyzer, detection adds the calcium ferrite powdery calcined sample of 7%-9% silica in 30% 1 oxidation
Carbon and 70% nitrogen mixture atmosphere, temperature are to lose quality at 950 DEG C, to calculate its reduction degree and recovery time.It is shown in Table 1.
Table 1
Reproducibility sample terminates the oxygen loss amount of reduction process and accounts for the ratio of theoretical maximum oxygen loss amount to represent.By test
The reproducibility of the calcium ferrite of pure calcium ferrite and interpolation 7%-9% silica, finds the calcium ferrite with addition of 7%-9% silica
Reduction degree compare and be not added with the pure calcium ferrite of silica and be improved and the recovery time reduces significantly, this shows in ferrous acid
The reaction efficiency of sintering deposit reduction can be greatly improved in calcium with addition of 7%-9% silica, and present invention production efficient to blast furnace is carried
More possibility are supplied.
Finally illustrate, above example is only unrestricted in order to technical scheme to be described, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, which all should be covered at this
In the middle of the right of invention.
Claims (5)
1. a kind of improve calcium ferrite reproducibility method, it is characterised in that comprise the steps：
S1：Mixing, calcium carbonate, di-iron trioxide and silica uniformly mixed, and wherein, calcium carbonate, di-iron trioxide rub
You are than being 1:1, the mass fraction for accounting for mixture of silica is 7%-9%；
S2：Briquetting, by S1, uniformly mixed sample is pressed into cylinder bulk sample with pressure-like machine；
S3：Roasting, the cylinder bulk sample that S2 is made are placed in high temperature silicon molybdenum stove and heat, and air atmosphere, from room temperature liter
To 900 DEG C, 1 hour is incubated so that calcium carbonate fully resolves into calcium oxide；1200 DEG C are continuously heating to, constant temperature 8-10 hours, so
After cool down, vibration powdering.
2. as claimed in claim 1 improve calcium ferrite reproducibility method, it is characterised in that calcium carbonate, three oxygen in the S1
Change two iron and silica purity is more than 99.99%.
3. as claimed in claim 1 improve calcium ferrite reproducibility method, it is characterised in that the pressure of pressure-like machine in the S2
For 10Mpa.
4. as claimed in claim 1 improve calcium ferrite reproducibility method, it is characterised in that S1 is uniformly mixed in the S2
Sample afterwards makes diameter 1cm, the cylinder bulk sample of high 1cm.
5. as claimed in claim 1 improve calcium ferrite reproducibility method, it is characterised in that after will be complete for roasting in the S3
Sample vibration is into the powdery below 100 mesh.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114480838A (en) * | 2022-01-17 | 2022-05-13 | 重庆大学 | Sintering method of prefabricated fluxed iron ore |
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| CN114480838A (en) * | 2022-01-17 | 2022-05-13 | 重庆大学 | Sintering method of prefabricated fluxed iron ore |
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