CN106755684B - A kind of method of iron ore fluidized reduction ironmaking - Google Patents
A kind of method of iron ore fluidized reduction ironmaking Download PDFInfo
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- CN106755684B CN106755684B CN201611086959.7A CN201611086959A CN106755684B CN 106755684 B CN106755684 B CN 106755684B CN 201611086959 A CN201611086959 A CN 201611086959A CN 106755684 B CN106755684 B CN 106755684B
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- iron ore
- coal dust
- ore powder
- iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000009467 reduction Effects 0.000 title claims abstract description 33
- 239000002817 coal dust Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims description 15
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052595 hematite Inorganic materials 0.000 claims description 5
- 239000011019 hematite Substances 0.000 claims description 5
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 5
- 239000002802 bituminous coal Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 19
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000012010 growth Effects 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 11
- 238000005253 cladding Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003610 charcoal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000001465 metallisation Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 description 3
- 239000001506 calcium phosphate Substances 0.000 description 3
- 235000011010 calcium phosphates Nutrition 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of methods of fluidized reduction ironmaking, comprising the following steps: by Iron Ore Powder and coal dust mixed grinding, coal dust is made to be coated on Iron Ore Powder surface；Fluidized reduction is carried out to the Iron Ore Powder for being coated with coal dust.The present invention by Iron Ore Powder and coal dust mixed grinding, makes coal dust be coated on Iron Ore Powder surface first, then carries out fluidized reduction, can effectively inhibit the growth of iron whiskers, and fluidized bed is inhibited to cohere defluidization, improves prereduced metal rate.Meanwhile method and process provided by the invention is simple, and it is industrially easy to implement, it is of great significance to energy-saving, environmental protection.
Description
Technical field
The invention belongs to a kind of methods that ironmaking technology field more particularly to fluidized reduction smelt iron.
Background technique
By development in more than 100 years, blast furnace ironmaking was compared with other iron-smelting process, the most mature, production scale with technology
Maximum, the features such as fuel ratio is minimum.However blast furnace ironmaking exists to the heavy dependence of high-quality caking coal resource, with steel in recent years
Iron commercial production scale and yield are skyrocketed through, and the supply day of coke is becoming tight, rapid rise of price, cause blast furnace ironmaking cost into
One step increases.The iron ore powder sintering agglomeration and coking process that interdependent phase is deposited therewith will not only consume mass energy, but also discharge more
Kind causes the pollutant seriously endangered to human body and natural environment, such as the chlorine of the alkali metal and heavy metal discharged in sintering process
Compound, dioxin etc. have containing a large amount of volatile phenol, cyanide, oils, ammonia nitrogen etc. are difficult to degrade in the waste water of process of coking discharge
Malicious composition, thus traditional iron-smelting process is the main object of environmental improvement.
Fluidized reduction is directly to utilize fine iron ore, CO, H2Gas makees reducing agent, and reaction carries out in gas-particle two-phase.By
There is the property of fluid in the solid material in fluidized state, the contact conditions between gas-particle two-phase are good, have mass transfer, heat transfer effect
The outstanding features such as rate is high, and temperature is uniform, thus paid attention to deeply in metallurgy industry.Iron ore is carried out in advance also under fluidized state
Original can save the technical process of fine ore pelletizing or sintering for agglumeration, have cost and environmental advantage, thus become current environment friend
Good ironmaking production technique.
Although fluidization technology iron-smelting process has many advantages, such as that reaction is efficient, can handle powder, in Reduction on Fluidized Bed mistake
Iron Ore Powder causes the fluidized bed operated normally to be destroyed, fluidizes often far below cohering under its fusion temperature in journey
Efficiency reduces, or even forms fixed bed, coheres defluidization phenomenon here it is so-called.Cohere defluidization is fluidized-bed process application one
A important bottleneck.A large number of studies show that (chemical industry metallurgical, 1980,2:100-116；Huadong Metallurgy College journal, 1989,6 (2):
47-55；Powder Technology.2002,124:28-39；ISIJ International,2007,47(2):217–225；
Chem.Eng.Technol.2009,32, (3): 392-397) the main reason for cohering defluidization during iron ore fluidized reduction, is just
It is the generation of iron whiskers, causes to link mutually between particle, forms bulk.
In order to inhibit Iron Ore Powder fluidized reduction to cohere the problem of defluidization in the process, scientific worker has done a large amount of works
Make.For example, Guo Lei etc. (steel, 2015,50 (6): 15-20.) carries out calcium phosphate coated to Brazilian miberal powder surface, found in test
Cladding calcium phosphate can inhibit the growth of surface iron whiskers in Brazilian miberal powder reduction process well.However, P elements are steels
The difficulty that certainly will increase subsequent technique is added in the harmful element of material, the artificial of calcium phosphate.The attached charcoal in Iron Ore Powder surface is to inhibit stream
Change the effective ways that bed coheres defluidization.Zhu Kaisun (steel research, 2000,116 (5): 4-7), Shi Yaojun (steel, 1993,28
(11): 1-6,13) attached charcoal has been carried out to Iron Ore Powder at low temperature to handle, the results showed that attached charcoal can be changed Iron Ore Powder fluidization also
Physical property of particle, structure during original accelerate reduction rate while inhibiting to cohere.However, attached charcoal process conditions are difficult to control, need
Want the suitable temperature of strict control, gas at gradation parameter, can just make chemically react 2CO=CO2+C、CH4=C+2H2It carries out,
And it is also very rambunctious for reacting the C being precipitated to be attached to Iron Ore Powder surface, thus this method is industrially difficult to implement.
Summary of the invention
In view of this, it is an object of the invention to a kind of method of fluidized reduction ironmaking, method energy provided by the invention
Enough growths for effectively inhibiting iron whiskers in reduction process, and operating process is simple, it is easy to implement.
The present invention provides a kind of methods of fluidized reduction ironmaking, comprising the following steps:
By Iron Ore Powder and coal dust mixed grinding, coal dust is made to be coated on Iron Ore Powder surface；
Fluidized reduction is carried out to the Iron Ore Powder for being coated with coal dust.
Wherein, the Iron Ore Powder is selected from magnetite powder or ground hematite；
The coal dust is selected from anchracite duff, bituminous coal powder or coke powder.
In one embodiment, the granularity of the Iron Ore Powder is less than 1.0mm；The granularity of the coal dust is less than 1.0mm.
In one embodiment, the time of the grinding is no less than 5 minutes.
In one embodiment, it is coated on coal dust after Iron Ore Powder surface further include: the Iron Ore Powder of coal dust will be coated with
It is separated with coal dust.
In one embodiment, the reducing gas of the fluidized reduction is CO, H2And N2Mixed gas, temperature 750
DEG C~950 DEG C, the time is 30min~90min.
Specifically, the present invention may include two process flows, respectively referring to Fig. 1 and Fig. 2, Fig. 1 is offer of the present invention
The ironmaking of first fluidized reduction process flow, Fig. 2 is the technique of second fluidized reduction provided by the invention ironmaking
Process.
The first process flow mainly comprises the steps that Iron Ore Powder is put into ball mill by (1) with coal and grinds together, makes
Iron Ore Powder outer surface is coated by coal dust, obtains coal dust cladding Iron Ore Powder.(2) according to the characteristic of carbon-encapsulated iron miberal powder and remaining coal dust
The two is separated using different methods, such as magnetite powder can be separated by the way of externally-applied magnetic field, ground hematite
Can use gravity separates it with coal dust.(3) carbon-encapsulated iron miberal powder is added in fluidized bed, is passed through CO, H2Etc. reproducibilities
Gas fluidized reduction at high temperature.(4) direct-reduction iron powder is obtained.
Second of process flow mainly comprises the steps that Iron Ore Powder is put into ball mill by (1) with coal and grinds together, makes
Iron Ore Powder outer surface is coated by coal dust.(2) coal dust cladding Iron Ore Powder and remaining coal dust are added in fluidized bed, i.e., not to grinding
Mill product is separated, and CO, H are passed through2Wait reducibility gas fluidized reduction at high temperature.(3) direct-reduction iron powder is obtained.
The present invention by Iron Ore Powder and coal dust mixed grinding, makes coal dust be coated on Iron Ore Powder surface first, then carries out fluidised form
Change reduction, can effectively inhibit the growth of iron whiskers, fluidized bed is inhibited to cohere defluidization, improves prereduced metal rate.Meanwhile this
It is simple to invent the method and process provided, it is industrially easy to implement, it is of great significance to energy-saving, environmental protection.
Detailed description of the invention
Fig. 1 is the process flow of first fluidized reduction ironmaking provided by the invention；
Fig. 2 is the process flow of second fluidized reduction ironmaking provided by the invention；
Fig. 3 is the iron that method provided in an embodiment of the present invention restores；
Fig. 4 is the iron that the method that comparative example of the present invention provides restores.
Specific embodiment
Embodiment 1
(1) magnetite powder for being less than 1.0mm and anchracite duff are put into ball mill and are ground 20 minutes.
(2) then Iron Ore Powder is separated using the method for magnetic dressing, obtains coal dust cladding Iron Ore Powder.
(3) coal dust cladding Iron Ore Powder is added in fluidized bed, at 850 DEG C, is passed through CO=40%, H2=10%, N2=50%
Mixed gas, fluidized reduction 60 minutes.
As a result fluidized bed does not cohere defluidization, and sample does not find iron whiskers, degree of metalization 85.7% after reduction.
Electron microscope scanning is carried out to obtained sample, is as a result side provided in an embodiment of the present invention referring to Fig. 3, Fig. 3
The iron that method restores, from the figure 3, it may be seen that without iron whiskers in sample.
Comparative example 1
Magnetite powder less than 0.15mm is added in fluidized bed, at 780 DEG C, is passed through CO=40%, H2=10%, N2=
50% mixed gas, fluidized reduction 30 minutes.
As a result fluidized bed coheres defluidization.
Electron microscope scanning is carried out to obtained sample, as a result referring to fig. 4, Fig. 4 is the side that comparative example of the present invention provides
The iron that method restores, as shown in Figure 4, there are a large amount of iron whiskers for sample surfaces.
Embodiment 2
(1) magnetite powder for being less than 1.0mm and anchracite duff are put into ball mill and are ground 15 minutes.
(2) directly grinding product (Iron Ore Powder and coal dust including coal dust cladding) is added in fluidized bed, at 870 DEG C, is led to
Enter CO=40%, H2=10%, N2=50% mixed gas, fluidized reduction 60 minutes.
As a result fluidized bed does not cohere defluidization, and sample does not find iron whiskers, degree of metalization 90.3% after reduction.
Embodiment 3
(1) ground hematite for being less than 1.0mm and anchracite duff are put into ball mill and are ground 10 minutes.
(2) then Iron Ore Powder is separated using the method for gravity separation, obtains coal dust cladding Iron Ore Powder.
(3) coal dust cladding Iron Ore Powder is added in fluidized bed, at 820 DEG C, is passed through CO=45%, H2=15%, N2=40%
Mixed gas, fluidized reduction 50 minutes.
As a result fluidized bed does not cohere defluidization, and sample does not find iron whiskers, degree of metalization 89.6% after reduction.
Embodiment 4
(1) ground hematite for being less than 1.0mm and anchracite duff are put into ball mill and are ground 5 minutes.
(2) directly grinding product (Iron Ore Powder and coal dust including coal dust cladding) is added in fluidized bed, at 860 DEG C, is led to
Enter CO=45%, H2=15%, N2=40% mixed gas, fluidized reduction 50 minutes.
As a result fluidized bed does not cohere defluidization, and sample does not find iron whiskers, degree of metalization 92.2% after reduction.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of method of fluidized reduction ironmaking, comprising the following steps:
By Iron Ore Powder and coal dust mixed grinding, coal dust is made to be coated on Iron Ore Powder surface；
The Iron Ore Powder for being coated with coal dust is separated with coal dust；
Fluidized reduction is carried out to the Iron Ore Powder for being coated with coal dust；
The granularity of the Iron Ore Powder is less than 1.0mm；The granularity of the coal dust is less than 1.0mm；
The reducing gas of the fluidized reduction is CO, H2And N2Mixed gas, temperature is 750 DEG C~950 DEG C, and the time is
30min~90min.
2. the method according to claim 1, wherein the Iron Ore Powder is selected from magnetite powder or ground hematite；
The coal dust is selected from anchracite duff, bituminous coal powder.
3. the method according to claim 1, wherein the time of the grinding is no less than 5 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611086959.7A CN106755684B (en) | 2016-12-01 | 2016-12-01 | A kind of method of iron ore fluidized reduction ironmaking |
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| CN201611086959.7A CN106755684B (en) | 2016-12-01 | 2016-12-01 | A kind of method of iron ore fluidized reduction ironmaking |
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| CN106755684B true CN106755684B (en) | 2019-11-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107227383B (en) * | 2017-06-27 | 2018-02-23 | 安徽工业大学 | The suppressing method of defluidization is cohered during a kind of pressurized fluidization reduced iron miberal powder |
| CN107130076B (en) * | 2017-06-27 | 2018-04-20 | 安徽工业大学 | A kind of anti-adhesion agent that coats suppresses fluidized reaction device and fluidized reaction method that Iron Ore Powder coheres defluidization |
| CN114410872B (en) * | 2022-01-24 | 2022-12-23 | 安徽工业大学 | Method for inhibiting bonding loss in fluidized reduction process of iron ore powder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818082A (en) * | 2006-03-10 | 2006-08-16 | 沈阳东方钢铁有限公司 | Iron and steel gas based smelting and reducing process with iron-ore powder pre-reduced |
| CN101624639A (en) * | 2009-08-05 | 2010-01-13 | 安徽工业大学 | Method for preventing fluidization high-hydrogen reduction bonding defluidization of iron ore powder |
| CN102296139A (en) * | 2011-07-28 | 2011-12-28 | 北京科技大学 | Method for inhibiting bonding defluidization in fluidization reduction of iron ore powder |
| CN102925611A (en) * | 2012-10-24 | 2013-02-13 | 中国科学院过程工程研究所 | Method for modifying iron ore powder by composite additive to prevent sticking and defluidizing during fluidization reduction |
| CN105755194A (en) * | 2016-03-11 | 2016-07-13 | 太原理工大学 | Iron ore powder fusion prereduction method |
-
2016
- 2016-12-01 CN CN201611086959.7A patent/CN106755684B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818082A (en) * | 2006-03-10 | 2006-08-16 | 沈阳东方钢铁有限公司 | Iron and steel gas based smelting and reducing process with iron-ore powder pre-reduced |
| CN101624639A (en) * | 2009-08-05 | 2010-01-13 | 安徽工业大学 | Method for preventing fluidization high-hydrogen reduction bonding defluidization of iron ore powder |
| CN102296139A (en) * | 2011-07-28 | 2011-12-28 | 北京科技大学 | Method for inhibiting bonding defluidization in fluidization reduction of iron ore powder |
| CN102925611A (en) * | 2012-10-24 | 2013-02-13 | 中国科学院过程工程研究所 | Method for modifying iron ore powder by composite additive to prevent sticking and defluidizing during fluidization reduction |
| CN105755194A (en) * | 2016-03-11 | 2016-07-13 | 太原理工大学 | Iron ore powder fusion prereduction method |
Non-Patent Citations (1)
| Title |
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| 矿煤混合流化床还原反应;方觉，储满生;《东北大学学报（自然科学版）》;20000229;第21卷(第1期);第80-82页 * |
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