CN108611488A - Pretreatment method of natural massive iron ore - Google Patents
Pretreatment method of natural massive iron ore Download PDFInfo
- Publication number
- CN108611488A CN108611488A CN201611142984.2A CN201611142984A CN108611488A CN 108611488 A CN108611488 A CN 108611488A CN 201611142984 A CN201611142984 A CN 201611142984A CN 108611488 A CN108611488 A CN 108611488A
- Authority
- CN
- China
- Prior art keywords
- ore
- iron ore
- pellet
- natural
- mine slot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 37
- 238000002203 pretreatment Methods 0.000 title abstract 2
- 239000008188 pellet Substances 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 17
- 238000005453 pelletization Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 4
- 238000009827 uniform distribution Methods 0.000 claims 1
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000012216 screening Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910001139 Telluric iron Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a pretreatment method of natural massive iron ore. When the chain grate-rotary kiln is used for producing acid pellets, an ore groove with the upper end and the lower end being closed is arranged in a two-section cooling area of a pellet circular cooler, 8-50 mm natural massive iron ore is evenly discharged through the ore groove and is distributed on the pellet circular cooler together with roasted pellets, after cooling is finished, powder which is generated by the pellets and the iron ore and is smaller than 8mm is returned to be reused through a pellet screening system, and the iron ore which is larger than 8mm and finished pellets are mixed and loaded together and are directly used for blast furnace smelting. When the ore tank is discontinuously charged, the lower end of the ore tank is temporarily sealed, and the upper end of the ore tank is opened; when the iron ore is fed to the circular cooler, the upper end of the ore tank is temporarily sealed, and the lower end of the ore tank is opened; the upper and lower ends are opened simultaneously as the chute is continuously charged. After the ore is pretreated, the direct charging proportion of the natural lump ore is effectively improved.
Description
Technical field
The invention belongs to field of steel metallurgy, are related to the preprocess method of iron ore, especially relate to a kind of natural
The preprocess method of massive iron ore.
Background technology
Theoretical according to traditional blast furnace " fine fodder ", blast furnace should improve " clinker " use ratio into stove iron-bearing material, i.e.,
To use sinter and pellet more.So within a very long time in past, the clinker use ratio of domestic blast furnace is 85%
More than, or even all using sinter and pellet.Relative to " clinker " being process by high temperature agglomeration process, directly from
The massive iron ore of mining processing then belongs to " raw material ", but from equipment investment, energy consumption and environmental protection, produces
Cost angularly considers that blast furnace is directly very useful using high-grade lump ore.But since natural lump ore is " raw material ", directly
When accessing blast furnace process, it may occur that crystallization water decomposition heat absorption, the problems such as explosive spalling, high temperature metallurgical properties are poor, this can make blast furnace
Gas permeability be deteriorated, coke ratio increases, the operation of blast furnace difficulty, thus these problems be limit blast furnace improved using lump ore ratio it is most basic
Property reason.
Currently, with the technological progress of ironmaking, the use ratio of natural lump ore iron ore has been improved than in the past, but also only
It is averagely 10% hereinafter, this severely limits the abilities of the creation economic benefit of ironmaking.Chinese patent
CN201310402287.6 describes a kind of sinter production method containing highly crystalline water lump ore, is mainly characterized by tying height
In brilliant water lump ore incorporation sinter mixture, it is sintered production together, to solve the problems such as lump ore crystallization water decomposition is with bursting.
But the method with addition of lump ore ratio it is limited, and if batch mixing is uneven, serious can influence the basicity that raw material is integrated into stove,
Blast fumance is adversely affected.
Chinese patent CN201220613941.9 then describes a kind of device improving iron ore thermal decrepitation, main
It is characterized as, carries out classification and heated by gas to it by this device before ore enters blast furnace.The method wants additional design and system
A set of calciner is made, cost of investment is big, and technology requires high, it is difficult to promote and apply.
Invention content
The main iron-bearing material of blast furnace is sinter, pellet and natural lump ore, since natural lump ore is " raw material ", without
High-temperature process is crossed, when being directly used in blast furnace process, it may occur that explosion, the problems such as the decomposition heat absorption of the crystallization water, this is serious to limit
Use ratio of the natural lump ore iron ore in blast furnace.And if the native iron for directly entering blast furnace can be improved on the basis of existing
The use ratio of ore can not only reduce the use ratio of sinter and pellet, reduce what sintering was brought with pelletizing production
Environmental pollution, moreover it is possible to ironmaking cost is significantly reduced, to improve the ability that blast furnace creates economic benefit.The present invention utilizes ball
Sufficient sensible heat when nodulizing cools down, lump ore iron ore is anticipated, under the appointed condition for only needing simply to be transformed, making should
Phenomena such as explosion and crystallization water decomposition for occurring in blast furnace, is in advance under the hot environment of two sections 600~800 DEG C of pellet circular cooler
Occur, while under high temperature environment, ore fraction high temperature metallurgical properties are also improved.By the pretreatment of ore, solve
Limit blast furnace use natural lump ore iron ore root problem, to effectively improve natural lump ore directly enter stove ratio, greatly
The reduction ironmaking cost of amplitude improves metallurgical ecological environment.
Specifically technical solution is：
(1) a kind of preprocess method of natural massive iron ore, is mainly characterized by, is produced with grate kiln
When acid pellet, in the region of pellet circular cooler two-step cooling, setting can be with the closed mine slot of upper and lower ends, by 8~50mm
Natural lump ore iron ore by the uniform blanking of mine slot, and cloth is on pellet circular cooler together for pellet after roasting, in cooling
After, by pellet sieving system, the powder less than 8mm that pelletizing and iron ore generate is returned and is recycled, will be greater than
The iron ore and finished ball nodulizing of 8mm loads in mixture together, is directly used in blast furnace process.
(2) it is to prevent ring cold machine heat losses, when mine slot is interrupted and feeds, mine slot lower end temporarily sealing, upper end is beaten
It opens；In iron ore blanking to ring cold machine, mine slot upper end temporarily sealing, lower end is opened；When mine slot continuously feeds, up and down
End opens simultaneously.
Advantageous effect：
When being pre-processed to natural lump ore iron ore using the present invention, equipment is simply transformed, in pelletizing ring
At a high temperature of two sections of cold, endothermic decomposition and the explosion of the crystallization water occur for natural iron ore, straight to solve limitation iron ore
The problem of accessing blast furnace use ratio.It, completely can be with acid pellet again since natural lump ore iron ore is mostly acid drift
Mine enters blast furnace use together, will not have an impact to the synthesis basicity of blast furnace.And when the cloth together with pellet, and it can improve
The problem of pelletizing is rolled in blast furnace material distribution to edge.So anticipating by the present invention, solves limitation blast furnace and uses
The most root problem of natural lump ore iron ore, so as to effectively improve natural lump ore directly enter stove ratio, significantly
Ironmaking cost is reduced, metallurgical ecological environment is improved.
Description of the drawings
Fig. 1 is the pretreated process flow chart of natural massive iron ore.In figure, 1 is drying grate；2 be rotary kiln；3 be mine
Slot；4 be ring cold machine
Specific implementation mode
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention,
The content of present invention is not limited.
Embodiment 1
The lower end of mine slot is sealed with sealing plate, mine slot is covered with 8~50mm Australia PB lump ores.It closes on mine slot
End opens lower end seal plate, PB lump ores is uniformly arranged in the pelletizing top to be cooled of two sections of pellet circular cooler.Wait for PB mines and
After pellet cooling, by pellet sieving system, it is sharp again that the powder less than 8mm that pelletizing and iron ore generate is returned into sintering
With the iron ore and finished ball nodulizing that will be greater than 8mm load in mixture together, are directly used in blast furnace process.
Embodiment 2
The lower end of mine slot is sealed with sealing plate, upper sealing panel is opened, and 8~50mm Australia Newman block is filled in mine slot
Mine opens lower end seal plate, keeps opening simultaneously state equipped with lump ore, upper-lower seal plate always in mine slot, continuously into mine slot
Charging terminates until to the charging of mine slot, and Newman lump ore is uniformly arranged in two sections of pellet circular cooler by end seal plate in closing
Pelletizing top to be cooled.After Newman mine and pellet cooling, by pellet sieving system, pelletizing and iron ore are generated
Powder less than 8mm returns to the roller grinding system of pelletizing, carries out pelletizing production again after being handled by ore grinding, will be greater than the iron of 8mm
Ore and finished ball nodulizing load in mixture together, are directly used in blast furnace process.
Claims (1)
1. a kind of preprocess method of natural massive iron ore, which is characterized in that produce acid pellet using grate kiln
When, in the region of pellet circular cooler two-step cooling, the closed mine slot of upper and lower ends is set, by the natural blocky iron of 8~50mm
By pellet after the uniform blanking of mine slot, and roasting, uniform distribution after cooling, passes through ore on pellet circular cooler together
The powder less than 8mm that pelletizing and iron ore generate is returned and is recycled, will be greater than the iron ore of 8mm by pellet sieving system
It is loaded in mixture together with finished ball nodulizing, is directly used in blast furnace process；
When mine slot is interrupted and feeds, mine slot lower end temporarily sealing, upper end is opened；In iron ore blanking to ring cold machine, institute
Mine slot upper end temporarily sealing is stated, lower end is opened；When mine slot continuously feeds, upper and lower side opens simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611142984.2A CN108611488A (en) | 2016-12-13 | 2016-12-13 | Pretreatment method of natural massive iron ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611142984.2A CN108611488A (en) | 2016-12-13 | 2016-12-13 | Pretreatment method of natural massive iron ore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108611488A true CN108611488A (en) | 2018-10-02 |
Family
ID=63643781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611142984.2A Pending CN108611488A (en) | 2016-12-13 | 2016-12-13 | Pretreatment method of natural massive iron ore |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108611488A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023845A (en) * | 2019-11-25 | 2020-04-17 | 攀钢集团攀枝花钢钒有限公司 | Utilization method of sinter waste heat of circular cooler |
| CN113720167A (en) * | 2020-05-26 | 2021-11-30 | 宝山钢铁股份有限公司 | Integrated method and system for drying and screening lump ore by using sintering waste heat |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2563035C (en) * | 2004-04-20 | 2011-05-17 | Amerifab, Inc. | Heat exchanger system used in steel making |
| CN202945295U (en) * | 2012-11-19 | 2013-05-22 | 首钢总公司 | Device for improving thermal explosion property of iron ore |
| CN103697709A (en) * | 2013-12-16 | 2014-04-02 | 陕西钢铁集团有限公司 | Method for dehydrating limonite by means of sintering waste heat |
-
2016
- 2016-12-13 CN CN201611142984.2A patent/CN108611488A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2563035C (en) * | 2004-04-20 | 2011-05-17 | Amerifab, Inc. | Heat exchanger system used in steel making |
| CN202945295U (en) * | 2012-11-19 | 2013-05-22 | 首钢总公司 | Device for improving thermal explosion property of iron ore |
| CN103697709A (en) * | 2013-12-16 | 2014-04-02 | 陕西钢铁集团有限公司 | Method for dehydrating limonite by means of sintering waste heat |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023845A (en) * | 2019-11-25 | 2020-04-17 | 攀钢集团攀枝花钢钒有限公司 | Utilization method of sinter waste heat of circular cooler |
| CN113720167A (en) * | 2020-05-26 | 2021-11-30 | 宝山钢铁股份有限公司 | Integrated method and system for drying and screening lump ore by using sintering waste heat |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181002 |
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| WD01 | Invention patent application deemed withdrawn after publication |