CN107604157B - A method of blast furnace iron carbon composite briquettes are prepared using hot vessel slag - Google Patents
A method of blast furnace iron carbon composite briquettes are prepared using hot vessel slag Download PDFInfo
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- CN107604157B CN107604157B CN201710742740.6A CN201710742740A CN107604157B CN 107604157 B CN107604157 B CN 107604157B CN 201710742740 A CN201710742740 A CN 201710742740A CN 107604157 B CN107604157 B CN 107604157B
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Abstract
The present invention relates to a kind of methods for preparing blast furnace iron carbon composite briquettes using hot vessel slag, comprising: 1) burdening calculation；2) pressure ball is mixed；3) the pre-heat treatment；4) first time stone；5) it pours and covers；6) second of stone；7) it is sintered；8) nitrogen is cooling；9) crushing and screening；The present invention brings it about reduction reaction using the waste-heat iron carbon composite briquettes of the hot vessel slag of high temperature and generates metallic iron, it is that Binder Phase to bond carbon, metal iron and its oxi prepares the iron carbon composite briquettes with certain basicity using the calcium of vessel slag, magnesium resource, reduce steel slag environmental pollution, also reduces ironmaking production cost.
Description
Technical field
The present invention relates to metallurgical technology fields more particularly to a kind of hot vessel slag of utilization to prepare the compound group of blast furnace iron carbon
The method of block.
Background technique
Blast furnace using iron carbon Composite burden be increase yield, reduce coke ratio, improve efficiency of heating- utilization most important approach it
One of the important directions of low temperature low-carbon Ironmaking Technology Development Based in one, and current ironmaking technology.The iron carbon that usual blast furnace uses is multiple
Closing furnace charge mainly includes carbonaceous pelletizing and iron coke.The usual carbon content of carbonaceous pelletizing accounts for the 40% of gross mass hereinafter, need to use a large amount of
Adhesive, therefore lose the glutinous, quantity of slag there is high temperature and be significantly increased and the problems such as blast wandering, hardly make in blast furnace at present
With.Iron coke is that metal Ferrum content accounts for gross mass lower than 40% coke below, although having after high-temperature process relatively high
Cold strength, but the CO in blast furnace in iron coke and blast furnace gas2Gasification reaction occurs, reduces rapidly its hot strength,
It is a large amount of also to will affect gas permeability when using, therefore iron carbon Composite burden uses and develops and is also restricted at present.
Vessel slag is the industrial solid wastes generated in a kind of convertor steelmaking process.According to statistics, 1 ton of steel of every production wants by-product
0.1~0.13 ton of vessel slag, the temperature of vessel slag is relatively high, can reach 1300 DEG C~1450 DEG C or so, heat content is also very rich
Richness, vessel slag per ton about contain the sensible heat of (1.26~1.88) × 106kJ, are equivalent to the heat of 45~60kg standard coal.Converter
Also containing 15%~25% metallic iron (MFe) and a large amount of beneficial element calcium, magnesium and silicon etc. in slag, therefore, increase to vessel slag
The recycling of heat and physical resources becomes the main means for reducing steel mill's smelting cost.
Currently, to the main methods of vessel slag be after hot vessel slag is cooled down by repeatedly be crushed, sieve,
Magnetic separation and etc., it is used again after extracting metal therein, vessel slag usually after processing is mainly used for ground backfill, road
Road making, cement raw material, water purification agent and steel slag fertilizer etc., this processing method recycle the sensible heat of vessel slag can not, cause energy
The huge waste in source.
Summary of the invention
The present invention provides a kind of methods for preparing blast furnace iron carbon composite briquettes using hot vessel slag, are warmed using height
The waste-heat iron carbon composite briquettes of state vessel slag bring it about reduction reaction and generate metallic iron, are provided using the calcium of vessel slag, magnesium
Source is that Binder Phase to bond carbon, metal iron and its oxi prepares the iron carbon composite briquettes with certain basicity, reduces steel
Slag environmental pollution also reduces ironmaking production cost.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A method of blast furnace iron carbon composite briquettes being prepared using hot vessel slag, are included the following steps:
1) burdening calculation: by iron-bearing material and coal dust according to quality percentage 10%~40%:60%~90% ratio into
Row ingredient；
2) it mixes pressure ball: iron-bearing material and coal dust being put into intensive mixer and mixed, while leading into intensive mixer
Enter vapor；Using obtaining to roll-in ball machine compression moulding, diameter is 30~50mm, compression strength is not less than after mixing
The iron carbon composite pellet green-ball of 50N/ ball；
3) the pre-heat treatment: iron carbon composite pellet green-ball is carried out at preheating using the high-temperature flue gas of cooling iron carbon Composite burden
Reason removes Free water and molecular water in material, and the temperature of iron carbon composite pellet green-ball is 100~200 DEG C after preheating；
4) first time stone: after the pre-heat treatment in iron carbon composite pellet green-ball spreading to container, while smooth material table
Face, the thickness of feed layer of first time stone are 50~100mm；
5) pour and cover: the hot vessel slag of high temperature is uniformly poured be layed onto it is smooth after iron carbon composite pellet green-ball surface, it is hot
Converter slag material layer with a thickness of 10~20mm；
6) it second of stone: on the iron carbon composite pellet green-ball spreading to hot converter slag material layer after the pre-heat treatment, puts down
Whole surface of material, the thickness of feed layer of second of stone are 20~50mm；
7) be sintered: using in hot vessel slag, calcium oxide, magnesia are as Binder Phase, directly in bonding iron carbon composite pellet
Ferrous material prepare iron carbon Composite burden；
8) nitrogen is cooling: combustion reaction occurs for coal dust and air in high-temperature sintering process in order to prevent, to bed of material surface drum
Nitrogen blowing is allowed to be cooled to 200 DEG C hereinafter, the high-temperature flue gas generated is introduced into step 3) to the progress of iron carbon composite pellet green-ball in advance
Heat；
9) crushing and screening: iron carbon Composite burden after cooling is sieved after broken crusher machine using grade sieve,
Finally obtain iron carbon composite briquettes finished product.
By mass percentage, fixed carbon content is 41%~55% to the iron carbon composite briquettes finished product, metal Ferrum content
It is 21%~35%；Content of ashes is 20%~25%, CaO/SiO in ash content2Ratio be 1.5~4.0；CaO+MgO/SiO2+
Al2O3Ratio be 1.75~4.20；P2O5Content≤0.2%, MFe/TFe is not less than 75%.
The iron-bearing material is magnetic iron ore, bloodstone, limonite, siderite, BF return fines, sinter return fine, metallurgical dust sludge
In one kind or two or more any combination.
The coal dust is one of 1/3 coking coal, bottle coal, lean coal binding coal or a variety of, and coal powder size < 3mm's accounts for
90% or more.
The temperature range of the hot vessel slag is 1300~1600 DEG C, and R coefficient of stabilization is 95% or more.
Compared with prior art, the beneficial effects of the present invention are:
The present invention combines the reapective features of hot vessel slag and sintering production technique, utilizes the oxidation in hot vessel slag
Calcium, oxidation magnesium resource directly bond ferrous material as Binder Phase and prepare iron carbon Composite burden, and hot vessel slag is not only utilized
Waste heat, and take full advantage of iron therein, calcium, magnesium resource, reduce pollution of the vessel slag to environment, while having saved burning
Carbon resource used when knot prevents pollution of the sintering process to atmospheric environment, ironmaking and STEELMAKING PRODUCTION cost is greatly lowered, opens
The new route that calcium, a magnesium resource recycle inside iron and steel enterprise is warded off.
Detailed description of the invention
Fig. 1 is a kind of process flow for the method that blast furnace iron carbon composite briquettes are prepared using hot vessel slag of the present invention
Figure.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
As shown in Figure 1, a kind of method for preparing blast furnace iron carbon composite briquettes using hot vessel slag of the present invention, packet
Include following steps:
1) burdening calculation: by iron-bearing material and coal dust according to quality percentage 10%~40%:60%~90% ratio into
Row ingredient；
2) it mixes pressure ball: iron-bearing material and coal dust being put into intensive mixer and mixed, while leading into intensive mixer
Enter vapor；Using obtaining to roll-in ball machine compression moulding, diameter is 30~50mm, compression strength is not less than after mixing
The iron carbon composite pellet green-ball of 50N/ ball；
3) the pre-heat treatment: iron carbon composite pellet green-ball is carried out at preheating using the high-temperature flue gas of cooling iron carbon Composite burden
Reason removes Free water and molecular water in material, and the temperature of iron carbon composite pellet green-ball is 100~200 DEG C after preheating；
4) first time stone: after the pre-heat treatment in iron carbon composite pellet green-ball spreading to container, while smooth material table
Face, the thickness of feed layer of first time stone are 50~100mm；
5) pour and cover: the hot vessel slag of high temperature is uniformly poured be layed onto it is smooth after iron carbon composite pellet green-ball surface, it is hot
Converter slag material layer with a thickness of 10~20mm；
6) it second of stone: on the iron carbon composite pellet green-ball spreading to hot converter slag material layer after the pre-heat treatment, puts down
Whole surface of material, the thickness of feed layer of second of stone are 20~50mm；
7) it is sintered；Using in hot vessel slag, calcium oxide, magnesia are as Binder Phase, directly in bonding iron carbon composite pellet
Ferrous material prepare iron carbon Composite burden；
8) nitrogen is cooling: combustion reaction occurs for coal dust and air in high-temperature sintering process in order to prevent, to bed of material surface drum
Nitrogen blowing is allowed to be cooled to 200 DEG C hereinafter, the high-temperature flue gas generated is introduced into step 3) to the progress of iron carbon composite pellet green-ball in advance
Heat；
9) crushing and screening: iron carbon Composite burden after cooling is sieved after broken crusher machine using grade sieve,
Finally obtain iron carbon composite briquettes finished product.
By mass percentage, fixed carbon content is 41%~55% to the iron carbon composite briquettes finished product, metal Ferrum content
It is 21%~35%；Content of ashes is 20%~25%, CaO/SiO in ash content2Ratio be 1.5~4.0；CaO+MgO/SiO2+
Al2O3Ratio be 1.75~4.20；P2O5Content≤0.2%, MFe/TFe is not less than 75%.
The iron-bearing material is magnetic iron ore, bloodstone, limonite, siderite, BF return fines, sinter return fine, metallurgical dust sludge
In one kind or two or more any combination.
The coal dust is one of 1/3 coking coal, bottle coal, lean coal binding coal or a variety of, and coal powder size < 3mm's accounts for
90% or more.
The temperature range of the hot vessel slag is 1300~1600 DEG C, and R coefficient of stabilization is 95% or more.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
[embodiment 1]
By iron-bearing material and coal dust according to mass percent be iron-bearing material 10%, coal dust 90% ratio carry out ingredient,
The two is put into intensive mixer and is mixed, while and being passed through vapor into intensive mixer；Then mixed material is used
To roll-in ball machine compression moulding, obtaining diameter is 30mm, and compression strength is not less than the iron carbon composite pellet green-ball of 50N/ ball.
Hot vessel slag temperature is 1500 DEG C, R (CaO/SiO2)=2.91；Utilize the high temperature cigarette of cooling iron carbon Composite burden
Gas carries out the pre-heat treatment to iron carbon composite pellet green-ball, evaporates moisture in heated material, temperature of charge is preheating to 200 DEG C of left sides
It is right.
In the iron carbon composite pellet green-ball spreading to container after the pre-heat treatment, smooth surface of material, after first time stone
Thickness of feed layer be 50mm；The hot vessel slag of high temperature is uniformly poured overlay on it is smooth after iron carbon composite pellet green-ball bed of material surface,
The thickness of feed layer of hot converter layer is 10mm；Again iron carbon composite pellet green-ball spreading after the pre-heat treatment to hot converter slag material layer
On, while smooth surface of material, the thickness of feed layer after second of stone is 20mm.
Combustion reaction occurs for coal dust and air in high-temperature sintering process in order to prevent, to high temperature iron carbon composite pellet surface drum
Nitrogen blowing is allowed to be cooled to 180 DEG C, and high-temperature flue gas is introduced into the iron carbon composite pellet green-ball preheating treatment procedure of front as pre-
Hot gas is sieved after iron carbon Composite burden is broken by grade sieve, and the iron carbon for finally obtaining certain particle size grade is compound
Agglomerate finished product；Specific chemical composition is shown in Table 1.
[embodiment 2]
By iron-bearing material and coal dust according to mass percent be iron-bearing material 20%, coal dust 80% ratio carry out ingredient,
The two is put into intensive mixer and is mixed, while and being passed through vapor into intensive mixer；Then mixed material is used
To roll-in ball machine compression moulding, obtaining diameter is 40mm, and compression strength is not less than the iron carbon composite pellet green-ball of 50N/ ball.
Hot vessel slag temperature is 1400 DEG C, R (CaO/SiO2)=2.60；Utilize the high temperature cigarette of cooling iron carbon Composite burden
Gas carries out the pre-heat treatment to iron carbon composite pellet green-ball, evaporates moisture in heated material, temperature of charge is preheating to 100 DEG C of left sides
It is right.
In the iron carbon composite pellet green-ball spreading to container after the pre-heat treatment, smooth surface of material, after first time stone
Thickness of feed layer be 100mm；The hot vessel slag of high temperature is uniformly poured overlay on it is smooth after iron carbon composite pellet green-ball bed of material surface,
The thickness of feed layer of hot converter layer is 20mm；Again iron carbon composite pellet green-ball spreading after the pre-heat treatment to hot converter slag material layer
On, while smooth surface of material, the thickness of feed layer after second of stone is 30mm.
Combustion reaction occurs for coal dust and air in high-temperature sintering process in order to prevent, to high temperature iron carbon composite pellet surface drum
Nitrogen blowing is allowed to be cooled to 170 DEG C, and high-temperature flue gas is introduced into the iron carbon composite pellet green-ball preheating treatment procedure of front as pre-
Hot gas is sieved after iron carbon Composite burden is broken by grade sieve, and the iron carbon for finally obtaining certain particle size grade is compound
Agglomerate finished product；Specific chemical composition is shown in Table 1.
[embodiment 3]
By iron-bearing material and coal dust according to mass percent be iron-bearing material 40%, coal dust 60% ratio carry out ingredient,
The two is put into intensive mixer and is mixed, while and being passed through vapor into intensive mixer；Then mixed material is used
To roll-in ball machine compression moulding, obtaining diameter is 50mm, and compression strength is not less than the iron carbon composite pellet green-ball of 50N/ ball.
Hot vessel slag temperature is 1600 DEG C, R (CaO/SiO2)=3.91；Utilize the high temperature cigarette of cooling iron carbon Composite burden
Gas carries out the pre-heat treatment to iron carbon composite pellet green-ball, evaporates moisture in heated material, temperature of charge is preheating to 150 DEG C of left sides
It is right.
In the iron carbon composite pellet green-ball spreading to container after the pre-heat treatment, smooth surface of material, after first time stone
Thickness of feed layer be 80mm；The hot vessel slag of high temperature is uniformly poured overlay on it is smooth after iron carbon composite pellet green-ball bed of material surface,
The thickness of feed layer of hot converter layer is 20mm；Again iron carbon composite pellet green-ball spreading after the pre-heat treatment to hot converter slag material layer
On, while smooth surface of material, the thickness of feed layer after second of stone is 50mm.
Combustion reaction occurs for coal dust and air in high-temperature sintering process in order to prevent, to high temperature iron carbon composite pellet surface drum
Nitrogen blowing is allowed to be cooled to 150 DEG C, and high-temperature flue gas is introduced into the iron carbon composite pellet green-ball preheating treatment procedure of front as pre-
Hot gas is sieved after iron carbon Composite burden is broken by grade sieve, and the iron carbon for finally obtaining certain particle size grade is compound
Agglomerate finished product；Specific chemical composition is shown in Table 1.
1 iron carbon composite briquettes chemical component mass fraction % of table
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of method for preparing blast furnace iron carbon composite briquettes using hot vessel slag, which comprises the steps of:
1) burdening calculation: iron-bearing material and coal dust are carried out according to the ratio of mass percent 10%~40%:60%~90%
Ingredient；
2) it mixes pressure ball: iron-bearing material and coal dust being put into intensive mixer and mixed, while being passed through water into intensive mixer
Steam；Using obtaining to roll-in ball machine compression moulding, diameter is 30~50mm, compression strength is not less than 50N/ ball after mixing
Iron carbon composite pellet green-ball；
3) the pre-heat treatment: carrying out the pre-heat treatment to iron carbon composite pellet green-ball using the high-temperature flue gas of cooling iron carbon Composite burden,
Free water and molecular water in material are removed, the temperature of iron carbon composite pellet green-ball is 100~200 DEG C after preheating；
4) first time stone: after the pre-heat treatment in iron carbon composite pellet green-ball spreading to container, while smooth surface of material,
The thickness of feed layer of stone is 50~100mm；
5) pour and cover: the hot vessel slag of high temperature is uniformly poured be layed onto it is smooth after iron carbon composite pellet green-ball surface, hot converter
Slag material layer with a thickness of 10~20mm；
6) second of stone: on the iron carbon composite pellet green-ball spreading to hot converter slag material layer after the pre-heat treatment, smooth object
Expect surface, the thickness of feed layer of second of stone is 20~50mm；
7) it is sintered: directly bonding containing in iron carbon composite pellet as Binder Phase using calcium oxide, magnesia in hot vessel slag
Iron material prepares iron carbon Composite burden；
8) nitrogen is cooling: combustion reaction occurs for coal dust and air in high-temperature sintering process in order to prevent, advertises nitrogen to bed of material surface
Gas is allowed to be cooled to 200 DEG C hereinafter, the high-temperature flue gas generated is introduced into step 3) and preheats to iron carbon composite pellet green-ball；
9) crushing and screening: iron carbon Composite burden after cooling is sieved, finally after broken crusher machine using grade sieve
Obtain iron carbon composite briquettes finished product；
By mass percentage, fixed carbon content is 41%~55% to the iron carbon composite briquettes finished product, and metal Ferrum content is
21%~35%；Content of ashes is 20%~25%, CaO/SiO in ash content2Ratio be 1.5~4.0；CaO+MgO/SiO2+
Al2O3Ratio be 1.75~4.20；P2O5Content≤0.2%, MFe/TFe is not less than 75%.
2. a kind of method for preparing blast furnace iron carbon composite briquettes using hot vessel slag according to claim 1, special
Sign is that the iron-bearing material is magnetic iron ore, in bloodstone, limonite, siderite, BF return fines, sinter return fine, metallurgical dust sludge
One kind or two or more any combination.
3. a kind of method for preparing blast furnace iron carbon composite briquettes using hot vessel slag according to claim 1, special
Sign is that the coal dust is one of 1/3 coking coal, bottle coal, lean coal binding coal or a variety of, and coal powder size < 3mm's accounts for
90% or more.
4. a kind of method for preparing blast furnace iron carbon composite briquettes using hot vessel slag according to claim 1, special
Sign is that the temperature range of the hot vessel slag is 1300~1600 DEG C, and R coefficient of stabilization is 95% or more.
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| CN108611487A (en) * | 2018-04-04 | 2018-10-02 | 首钢集团有限公司 | A kind of resource utilization method of the solid waste containing magnesium |
| CN108642273B (en) * | 2018-05-15 | 2019-08-27 | 鞍钢股份有限公司 | A kind of iron carbon silicon two-layer compound pelletizing of vessel slag modification and preparation method thereof |
| CN108609875B (en) * | 2018-05-15 | 2020-09-29 | 鞍钢股份有限公司 | Method for preparing cement mixture by using converter slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211629A (en) * | 1998-07-31 | 1999-03-24 | 宝山钢铁(集团)公司 | Treatment method for high zinc containing iron dust |
| CN104512988A (en) * | 2013-09-29 | 2015-04-15 | 宝山钢铁股份有限公司 | Method for treating heavy metal sludge by using stainless steel molten slag |
| CN105838876A (en) * | 2016-05-10 | 2016-08-10 | 北京科技大学 | Method for recovering and treating zinc-containing dust through blast furnace slag sensible heat |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5272307A (en) * | 1975-12-15 | 1977-06-16 | Okura Akimitsu | Process for production of sintered ore making use of converter slag |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211629A (en) * | 1998-07-31 | 1999-03-24 | 宝山钢铁(集团)公司 | Treatment method for high zinc containing iron dust |
| CN104512988A (en) * | 2013-09-29 | 2015-04-15 | 宝山钢铁股份有限公司 | Method for treating heavy metal sludge by using stainless steel molten slag |
| CN105838876A (en) * | 2016-05-10 | 2016-08-10 | 北京科技大学 | Method for recovering and treating zinc-containing dust through blast furnace slag sensible heat |
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