CN108642273B - A kind of iron carbon silicon two-layer compound pelletizing of vessel slag modification and preparation method thereof - Google Patents
A kind of iron carbon silicon two-layer compound pelletizing of vessel slag modification and preparation method thereof Download PDFInfo
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- CN108642273B CN108642273B CN201810463217.4A CN201810463217A CN108642273B CN 108642273 B CN108642273 B CN 108642273B CN 201810463217 A CN201810463217 A CN 201810463217A CN 108642273 B CN108642273 B CN 108642273B
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The present invention discloses a kind of iron carbon silicon two-layer compound pelletizing and preparation method thereof of vessel slag modification, it is that the material for having heterogeneity iron carbon silicon by inside and outside two layers is combined, internal layer is formed according to mass percent iron tailings 30%-60%, blast furnace dedusting ash 35%-65%, pitch 1%~6%；Outer layer be according to mass percent steel cuttings 90%~99.5%, pitch 0.5%~10% form containing metallic iron, silica, carbon, ferriferous oxide iron carbon silicon composite pellet；It is 50%~70% that outer layer quality, which accounts for iron carbon silicon two-layer compound pelletizing gross mass degree, and it is 30%~50% that internal layer quality, which accounts for iron carbon silicon two-layer compound pelletizing gross mass degree,.
Description
Technical field
It is multiple that the invention belongs to the iron carbon silicon bilayers of steel slag comprehensive treatment technique field more particularly to a kind of vessel slag modification
Close pelletizing and preparation method thereof.
Background technique
Vessel slag is the industrial solid wastes generated during a kind of pneumatic steelmaking.1 ton of steel of every production want by-product 0.1~
0.13 ton of steel slag, 1350 DEG C~1450 DEG C or so of temperature.Wherein also contain 10~30% full iron (TFe) and a large amount of beneficial elements
Calcium, magnesium and silicon etc..Currently, most iron and steel enterprise generallys use simple magnetic separation, remaining tailings sells water supply in addition to small part
Other than mud factory, it is largely dumped abandoning, causes environmental pollution, land seizure and the wasting of resources.
Preprocess method in pretreatment of slag part has: hot application method, the bored method of heat, drum process, autoclave method and wind quenching method
It is exactly hot application method and the bored method of heat Deng, the preprocess method being generally used now.Hot application method is briefly exactly hot application place
On hot melt steel slag, the method by fetching water is allowed to be quickly cooled down and part dusting, but since occupied area is larger, and adopt
With open work, fugitive dust and high alkalinity water pollution can be led to the problem of.The bored method of heat is the pretreatment of slag work just having the nearly more than ten years
Skill；Since the bored method operation of heat carries out in workshop, dust is greatly reduced to extraneous pollution, bored slag bath has closed circuit plumbing
System also avoids the pollution of high alkalinity water.
This material by high-temperature process of vessel slag, potential value are far from being embodied.Current research and
Practical application proves, compared with blast furnace slag, the RO phase that contains in vessel slag, Spinel, various iron-containing compounds, olivine
Phase, metallic iron belong to wear phase, increase the processing cost of steel slag, and the basicity of steel slag is higher, in slag free calcium oxide and
Magnesia is more, in addition the crystal grain of the gum material among steel slag is fine and close, reactivity is low, and the reaction time is long, affects converter
The stability of slag product limits the use scope of vessel slag.
Metal iron charge how is effectively recycled from vessel slag and utilizes its high-temperature residual heat, while its remaining tailings can be by
It is used to high added value, is the key that reduce steel slag pollution, increase Business Economic Benefit.
Summary of the invention
For the defect of currently available technology, the technical problem to be solved by the present invention is to propose a kind of vessel slag modification
Iron carbon silicon two-layer compound pelletizing and preparation method thereof.In order to improve melt vessel slag modification smelting process kinetics item
Part improves the utilization efficiency of blast furnace dedusting ash, is that iron tailings, dedusting ash, iron scale or steel are cut as raw material, adds a certain amount of coheres
Agent is prepared into iron carbon two-layer compound pelletizing using roll pressing technique, increases its density, makes first to sink to slag in its smelting process
Bottom rises slow rising again, between increasing reducing agent stroke being timely in furnace, shortens recovery time and smelting cycle, improves production effect
Rate increases the molten iron rate of output, finally reduces production cost.
Object of the present invention is to what is realized by following technical solution:
A kind of iron carbon silicon two-layer compound pelletizing of vessel slag modification, which is characterized in that be by inside and outside two layers tool it is different at
The material of iron carbon silicon is divided to be combined, internal layer is according to mass percent iron tailings 30%-60%, blast furnace dedusting ash 35%-
65%, pitch 1%~6% forms；Outer layer is according to 0.5%~10% group of mass percent steel cuttings 90%~99.5%, pitch
At containing metallic iron, silica, carbon, ferriferous oxide iron carbon silicon composite pellet；Outer layer quality accounts for iron carbon silicon two-layer compound
Pelletizing gross mass degree is 50%~70%, and internal layer quality accounts for iron carbon silicon two-layer compound pelletizing gross mass degree
It is 30%~50%.
SiO in the iron tailings2Mass content is greater than 65%, and granularity < 0.174mm accounts for 70% or more mass ratio, water
Divide 2% or less percentage composition.
According to melt vessel slag chemical component at the beginning and the chemical component of iron tailings, blast furnace dedusting ash, basicity of slag R4
=(CaO+MgO)/(SiO2+Al2O3)=0.8~1.3 determines iron tailings additive amount.
Granularity < 0.174mm of the pitch accounts for mass ratio 100%.
The metallic iron mass content that the steel is cut is greater than 90%, and granularity < 3mm accounts for 50% or more mass ratio.
Carbon mass content is greater than 25% in the blast furnace dedusting ash, and granularity < 0.174mm accounts for 80% or more mass ratio,
2% or less biodiversity content.
Using reducing agent and ferriferous oxide content and finishing slag ferriferous oxide content as foundation, carbon containing gross mass relationship is added
Formula: MC> K × (α × (M1+M2+M3)+β×(M4+M5+M6)+λ×(M7+M8+M9)+ε×(M10+M11+M12))；Wherein MCTo be added
Carbon containing total amount, kg；K is phosphorus content coefficient of excess, in the range of 1.2~2；α is that carbon restores Fe2O3Related coefficient, in the range of
0.20~0.25；M1For Fe in vessel slag2O3Quality, kg；M2For Fe in blast furnace dedusting ash2O3Quality, kg, M3For iron tailings
Middle Fe2O3Quality, kg；β is that carbon restores FeO related coefficient, in the range of 0.162~0.172；M4For the matter of FeO in vessel slag
Amount, kg, M5For the quality of FeO in blast furnace dedusting ash, kg, M6For the quality of FeO in iron tailings, kg；λ is that carbon restores P2O5It is related
Coefficient, in the range of 0.413~0.433；M7For P in vessel slag2O5Quality, kg, M8For P in blast furnace dedusting ash2O5Quality,
kg；M9For P in iron tailings2O5Quality, kg；ε is that carbon restores MnO related coefficient, in the range of 0.164~0.174；M10To turn
The quality of MnO, kg in clinker；M11For the quality of MnO in blast furnace dedusting ash, kg；M12For the quality of MnO in iron tailings, kg.
A kind of iron carbon silicon two-layer compound pelletizing preparation method of vessel slag modification, it is characterised in that: press ectonexine raw material
Ratio respectively puts mixture be heated to 350~500 DEG C in heating furnace after；Using inside and outside double-layer hopper respectively in 5~10t/
cm2Pressure under use and diameter is made to roll-in ball machine for 10~60mm there is green ball strength to change not less than the vessel slag of 2.0KN
Matter iron carbon silicon two-layer compound pelletizing.
The present invention produces iron carbon silicon composite pellet using inside and outside double-layer hopper cloth and pressure ball mode；It is compound to increase iron carbon silicon
The density of pelletizing makes first to sink to slag bottom in its smelting process and rises slow rising again, it is timely to increase reducing agent stroke in furnace
Between, shorten recovery time and smelting cycle, improve production efficiency, increases the molten iron rate of output, finally reduce production cost.
Specific embodiment
It is illustrated combined with specific embodiments below:
Raw material forms quality proportioning/% in 1 embodiment of table
Embodiment 1
It is produced using inside and outside double-layer hopper cloth and pressure ball mode a kind of multiple for iron carbon silicon bilayer in molten slag modification
Close pelletizing preparation method；Internal layer material proportionally uses mixing machine according to iron tailings 30%, blast furnace dedusting ash 65%, pitch 5%
Mixture is made in mixing, mixture is put after being heated to 350 DEG C in heating furnace；Outer skin materials cut 99.5%, pitch according to steel
Mixture is made in the mixing of 0.5% ratio mixing machine, is then existed respectively according to certain flow ratio using inside and outside double-layer hopper
50t/cm2Pressure under use to roll-in ball machine be made diameter for 60mm have some strength oval sections carbon silicon composite balls
Group.
Embodiment 2
It is produced using inside and outside double-layer hopper cloth and pressure ball mode a kind of multiple for iron carbon silicon bilayer in molten slag modification
Close pelletizing preparation method；Internal layer material proportionally uses mixing machine according to iron tailings 40%, blast furnace dedusting ash 58%, pitch 2%
Mixture is made in mixing, mixture is put after being heated to 500 DEG C in heating furnace；Outer skin materials cut 93%, pitch 7% according to steel
Mixture is made in the mixing of ratio mixing machine, then using inside and outside double-layer hopper respectively according to certain flow ratio in 40t/cm2
Pressure under use to roll-in ball machine be made diameter for 50mm have some strength oval sections carbon silicon composite pellet.
Embodiment 3
It is produced using inside and outside double-layer hopper cloth and pressure ball mode a kind of multiple for iron carbon silicon bilayer in molten slag modification
Close pelletizing preparation method；Internal layer material proportionally uses mixing machine according to iron tailings 50%, blast furnace dedusting ash 46%, pitch 4%
Mixture is made in mixing, mixture is put after being heated to 450 DEG C in heating furnace；Outer skin materials cut 95%, pitch 5% according to steel
Mixture is made in the mixing of ratio mixing machine, then using inside and outside double-layer hopper respectively according to certain flow ratio in 30t/cm2
Pressure under use to roll-in ball machine be made diameter for 45mm have some strength oval sections carbon silicon composite pellet.
Embodiment 4
It is produced using inside and outside double-layer hopper cloth and pressure ball mode a kind of multiple for iron carbon silicon bilayer in molten slag modification
Close pelletizing preparation method；Internal layer material proportionally uses mixing machine according to iron tailings 60%, blast furnace dedusting ash 37%, pitch 3%
Mixture is made in mixing, mixture is put after being heated to 400 DEG C in heating furnace；Outer skin materials cut 90%, pitch according to steel
Mixture is made in the mixing of 10% ratio mixing machine, then using inside and outside double-layer hopper respectively according to certain flow ratio in 10t/
cm2Pressure under use to roll-in ball machine be made diameter for 10mm have some strength oval sections carbon silicon composite pellet.
Embodiment 5
It is produced using inside and outside double-layer hopper cloth and pressure ball mode a kind of multiple for iron carbon silicon bilayer in molten slag modification
Close pelletizing preparation method；Internal layer material proportionally uses mixing machine according to iron tailings 55%, blast furnace dedusting ash 44%, pitch 1%
Mixture is made in mixing, mixture is put after being heated to 500 DEG C in heating furnace；Outer skin materials cut 98%, pitch 2% according to steel
Mixture is made in the mixing of ratio mixing machine, then using inside and outside double-layer hopper respectively according to certain flow ratio in 50t/cm2
Pressure under use to roll-in ball machine be made diameter for 25mm have some strength oval sections carbon silicon composite pellet.
2 embodiment effect of table/%
| Embodiment | Density (g/cm3) | Compression strength (KN) |
| Embodiment 1 | 6.10 | 2.6 |
| Embodiment 2 | 4.99 | 2.1 |
| Embodiment 3 | 5.44 | 2.5 |
| Embodiment 4 | 4.69 | 2.1 |
| Embodiment 5 | 5.68 | 2.9 |
From the point of view of result above, the present invention is prepared into iron carbon silicon two-layer compound pelletizing compression strength height, and numerical value is both greater than
2.1KN or more can reduce pelletizing pulverization rate in molten slag modification use process, improve iron tailings and blast furnace dedusting ash
Utilization efficiency reduces power consumption and production cost.
Claims (2)
1. a kind of iron carbon silicon two-layer compound pelletizing of vessel slag modification, which is characterized in that be by inside and outside two layers of tool heterogeneity
The material of iron carbon silicon is combined, internal layer be according to mass percent iron tailings 30%-60%, blast furnace dedusting ash 35%-65%,
Pitch 1%~6% forms；Outer layer is contained according to what mass percent steel cuttings 90%~99.5%, pitch 0.5%~10% formed
There is the iron carbon silicon composite pellet of metallic iron, silica, carbon, ferriferous oxide；It is total that outer layer quality accounts for iron carbon silicon two-layer compound pelletizing
Mass percentage content is 50%~70%, and it is 30% that internal layer quality, which accounts for iron carbon silicon two-layer compound pelletizing gross mass degree,
~50%；
SiO in the iron tailings2Mass content is greater than 65%, and granularity < 0.174mm accounts for 70% or more mass ratio, percent water
Below content 2%；
Granularity < 0.174mm of the pitch accounts for mass ratio 100%；
The metallic iron mass content of the steel cuttings is greater than 90%, and granularity < 3mm accounts for 50% or more mass ratio；
Carbon mass content is greater than 25% in the blast furnace dedusting ash, and granularity < 0.174mm accounts for 80% or more mass ratio, moisture
Below mass content 2%；
Using reducing agent and ferriferous oxide content and finishing slag ferriferous oxide content as foundation, carbon containing gross mass relational expression: M is addedC>
K×(α×(M1+M2+M3)+β×(M4+M5+M6)+λ×(M7+M8+M9)+ε×(M10+M11+M12))；Wherein MCFor the carbon containing of addition
Total amount, kg；K is phosphorus content coefficient of excess, in the range of 1.2~2；α is that carbon restores Fe2O3Related coefficient, in the range of 0.20~
0.25；M1For Fe in vessel slag2O3Quality, kg；M2For Fe in blast furnace dedusting ash2O3Quality, kg, M3For Fe in iron tailings2O3
Quality, kg；β is that carbon restores FeO related coefficient, in the range of 0.162~0.172；M4For the quality of FeO in vessel slag, kg,
M5For the quality of FeO in blast furnace dedusting ash, kg, M6For the quality of FeO in iron tailings, kg；λ is that carbon restores P2O5Related coefficient,
Range is 0.413~0.433；M7For P in vessel slag2O5Quality, kg, M8For P in blast furnace dedusting ash2O5Quality, kg；M9For
P in iron tailings2O5Quality, kg；ε is that carbon restores MnO related coefficient, in the range of 0.164~0.174；M10For in vessel slag
The quality of MnO, kg；M11For the quality of MnO in blast furnace dedusting ash, kg；M12For the quality of MnO in iron tailings, kg.
2. a kind of modification of vessel slag according to claim 1 iron carbon silicon two-layer compound pelletizing preparation method, it is characterised in that:
Mixture is put respectively by ectonexine material rate after being heated to 350~500 DEG C in heating furnace；Using inside and outside double-layer hopper point
Not in 5~10t/cm2Pressure under use and diameter is made to roll-in ball machine has green ball strength not less than 2.0kN for 10~60mm
Vessel slag modification use iron carbon silicon two-layer compound pelletizing.
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| CA2590259C (en) * | 2004-12-07 | 2016-02-16 | Nu-Iron Technology, Llc | Method and system for producing metallic iron nuggets |
| CN104726699B (en) * | 2015-03-25 | 2017-03-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | The high-intensity composite metal pellet being produced using iron containing metallurgical dust and its production technology |
| CN107604157B (en) * | 2017-08-25 | 2019-03-22 | 鞍钢股份有限公司 | A method of blast furnace iron carbon composite briquettes are prepared using hot vessel slag |
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