CN105925744A - Method for producing iron beads at low temperature through dust of iron and steel plant - Google Patents
Method for producing iron beads at low temperature through dust of iron and steel plant Download PDFInfo
- Publication number
- CN105925744A CN105925744A CN201610306128.XA CN201610306128A CN105925744A CN 105925744 A CN105925744 A CN 105925744A CN 201610306128 A CN201610306128 A CN 201610306128A CN 105925744 A CN105925744 A CN 105925744A
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- China
- Prior art keywords
- dust
- iron
- ferrum
- pearl
- low temperature
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2200/00—Recycling of non-gaseous waste material
Abstract
The invention relates to a method for producing iron beads at the low temperature through dust of an iron and steel plant. The method has high adaptability to raw materials, can utilize dust generated during different processes of the iron and steel plant, and carries out matching according to basic physical properties of the raw materials. One or more kinds of dust is evenly mixed with a reduction agent, an adhesive agent and a fluxing agent, then the mixture is pressed into cold solidified pellets, the pellets are subjected to reduction, smelting and slag-iron separation in a rotary hearth furnace, and accordingly iron beads with a low metallization ratio and low-iron slag are obtained. The method mainly includes the two steps that the self-reduced dust pellets are prepared through raw materials such as dust and the fluxing agent, and the dust pellets are smelted by the rotary hearth furnace at the low temperature to produce iron beads. The problem that melt separation is difficult as self-reduced dust pellets are high in melt separation temperature, harmful ingredient content and slag amount is solved.
Description
Art
The present invention relates to a kind of Dust of Iron And Steel Works and process technique, especially relate to one and utilize rotary hearth furnace low
Process Dust of Iron And Steel Works under temperature, while producing pearl ferrum, reclaim the rotary hearth furnace process of valuable element zinc.
Background technology
Steel and iron industry is as the basic industry of national economy, and its major product steel relate to our daily life
Every aspect.In recent years along with serious superfluous and international community's day to efforts at environmental protection of steel market production capacity
Benefit is paid close attention to so that iron and steel enterprise is in a devil of hole, and therefore seeks energy-conserving and environment-protective and seems with the outlet reducing operating cost
Particularly important.And dust can also be as consolidating that secondary resource carries out reclaiming while be to pollute the heaviest in iron and steel enterprise
Body garbage, the high efficiente callback utilization of dust can improve the competitiveness of steel plant significantly.
Dust mainly sintering, smelt iron, make steel and the operation such as rolling produce, there is fine size, composition multiple
The feature that miscellaneous, quantum of output is high, granularity of dust is the most floating causes environmental pollution the most also to dust in atmosphere
Collection bring difficulty, complicated component to make the recovery difficult of dust increase.Steel plant process the side of dust at present
Method mainly returns sintering process, but sintering process can not remove the harmful element such as zinc, lead, to blast furnace ironmaking meeting
Produce certain impact.In addition the technique processing dust also includes wet processing and thermal process, wet processing due to
The treatment effeciency that there is dust is low, equipment corrosion is serious and the shortcoming such as relatively costly is not as main dust disposal
Means.Thermal process includes being reduced directly technique and smelting reduction process, and smelting reduction process processes the effect of dust
The removal efficiency of the harmful elements such as rate and zinc lead is the highest, however it is necessary that the biggest energy consumption.Direct-reduction technique be
The process under the fusing point of sponge iron carried out dust, has that harmful element removal efficiency is high, energy consumption is relatively low
The prospect that advantage, particularly rotary hearth furnace process process dust production pearl ferrum is the biggest.
Rotary hearth furnace process primary raw material is carbonaceous pelletizing, carbonaceous pelletizing has that reduction reaction rate is fast, reduction thoroughly
Etc. advantage, therefore interior join carbon when utilizing rotary hearth furnace to process dust, dust is pressed into a kind of special carbon containing ball
Group.And rotary hearth furnace has a problem in that treatment effeciency is low, molten point of temperature of production pearl ferrum is higher (to be required at 1400 DEG C
Above), especially process gangue content is many, Iron grade is low dust agglomerate and need higher temperature and longer
Time.To this end, the present invention is from improving roasting link, proposes one by adding flux and reduce molten point
The method of temperature.
Summary of the invention
The present invention relates to a kind of method utilizing Dust of Iron And Steel Works to produce pearl ferrum at low temperatures, the method is to raw material
Strong adaptability, can utilize the dust produced in steel plant's difference flow process, carry out proportioning according to the Basic Physical Properties of raw material.
The present invention provides a kind of technique utilizing under Dust of Iron And Steel Works low temperature and quickly producing pearl ferrum, by dust and reducing agent,
Being pressed into special carbonaceous pelletizing after flux mixing, wherein reducing agent can be coke powder, and flux is red bauxite
(Al2O3>=40%, 18%≤SiO2≤ 30%, Fe2O3>=10%) or spodumene (LiAl [Si2O6],
3.0% < Li2O < 7.0%, 17% < Al2O≤25%, SiO2< 80%), flux consumption is 1%-5%.By with addition of life
Calx and the dual alkalinity of Silicon stone regulation pelletizing.By the carbonaceous pelletizing for preparing at low temperatures (1250 DEG C～
1350 DEG C) the fast fast thawing that is capable of slag ferrum divides.
A kind of method utilizing Dust of Iron And Steel Works to produce pearl ferrum at low temperatures, production process is as follows:
(1) compacting of autoreduction dust agglomerate: the dust after drying presses C/O=1.0～1.2 with reducing agent
Mix, and allocate cement into and be pressed into agglomerate, at curing box as after binding agent and flux mix homogeneously
Interior maintenance 72h post-drying 4h i.e. can obtain the dust autoreduction agglomerate with certain cold strength；
(2) dezincification of autoreduction dust agglomerate: after agglomerate temperature reaches 907 DEG C, the zinc in agglomerate can quilt
Out, along with flue gas is discharged together, before entering flue dust, the reoxidized one-tenth ZnO of meeting, passes through cigarette in direct-reduction
It is reclaimed for zinc metallurgy industry by dirt retracting device；
(3) molten point of the reduction of autoreduction dust agglomerate: at rotary hearth furnace bottom refractory material upper berth thick layer about 5～
The coke powder of 10mm, prevents pearl ferrum from boning.Then 1～2 layer of autoreduction dust agglomerate, rotary hearth furnace is spread above
By burner, fire box temperature is controlled at 1250～1350 DEG C as fuel using coal, coal gas or oil, in this temperature
Lower constant temperature 10～30min, finally obtains the degree of metalization pearl ferrum more than 90%.
(4) pearl ferrum and the separation of skull: first product is carried out together with being embedded in skull by the pearl ferrum of production
Broken, the separation of slag ferrum is realized followed by magnetic separation, after magnetic separation, the pearl ferrum of gained can be directly used for ironmaking or steel-making
Operation.
The rotary hearth furnace process utilizing zinc-containing dust to produce pearl ferrum is more or less the same with traditional rotary hearth furnace process, need to be
In original technique, fire box temperature being improved 50 DEG C～100 DEG C, product is become pearl ferrum from metallized pellet.
The feature that dust used by autoreduction dust agglomerate has fine size, specific surface area is big, with contacting of reducing agent
Area is big, fast reaction can generate metallic iron during reduction, simultaneously with addition of flux can reduce the fusing point of slag,
Improve the mobility of slag phase, so can realize fast fast thawing under low temperature and divide.
The capital equipment realizing the rotary hearth furnace process that autoreduction dust agglomerate melts point under low temperature includes: conventional rotary hearth furnace
Equipment, batch mixer, maintenance workshop, disintegrating machine, magnetic separator.
Using Iron Ore Powder to be primary raw material relative to common carbonaceous pelletizing, the advantage of autoreduction dust agglomerate is to adopt
With steel plant's garbage as iron-smelting raw material, there is economic worth and environment protection significance.The C simultaneously contained in dust
With the usage amount that the resources such as CaO can reduce coke powder and quick lime, the raising that granularity of dust is thin, specific surface area is big
The efficiency that agglomerate melts point.
The method that the present invention provides reduction dust agglomerate to melt point temperature need not carry out existing rotary hearth furnace process
Change, and raw material is the dust of wide material sources in steel plant, has feasibility technically.Needed for the present invention
Flux be cheap red bauxite or spodumene, raw material dust is from steel plant self, and dust itself removes
Zinc lead can recycle as secondary resource, therefore the present invention provide technique there is the highest added value.
The dust disposal technique that the present invention provides simultaneously can make full use of the solid waste of steel plant, decreases dust
Pollution to environment.
Use dust autoreduction agglomerate to melt the mitogenetic rotary hearth furnace process producing pearl ferrum and mainly have a following characteristics:
(1) Dust of Iron And Steel Works is as the raw material of production pearl ferrum, has wide material sources, is worth the advantages such as cheap,
And the valuable element of self can reduce the outer of reducing agent and flux etc. and joins in dust；
(2) flux red bauxite and spodumene abundance, with low cost, it is possible to use self component can
Realize excellent fit slag, and the problems such as fluoride pollution will not be caused；
(3) production efficiency of rotary hearth furnace can be improved, and autoreduction dust agglomerate is at the pearl ferrum of also original production
While be volatized into the ZnO content height of flue dust and may be used for smelting process, improve productivity effect；
(4) molten point of the low temperature of autoreduction dust agglomerate, reduces rotary hearth furnace energy consumption, and crushing-magnetic selection technique solution
The problem that traditional mode of production of having determined metallized pellet slag inclusion is many.
Accompanying drawing explanation
Fig. 1 is the rotary hearth furnace process schematic flow sheet using autoreduction dust agglomerate to produce pearl ferrum.
Detailed description of the invention
Embodiment 1
Sack dust and electric furnace ash are the ratio mixing of 3:7 in mass ratio, and its composition is shown in Table 1, and dust presses C/O=1.0
With addition of coke powder, binding agent cement is with addition of 10% that amount is mixed dust quality, and flux red bauxite is mixed with addition of amount
Close the 2% of dust quality, compound is mixed in high speed mixer, blending process uses spraying shape
Formula adds moisture in compound, always with addition of water rate control after dust, coke, cement and flux mix
About the 10% of gross mass.Subsequently the compound after fully mixing is used pressurize under 80MPa pressure in ball press
Compound was made block in 1 minute.Agglomerate is maintenance 72h post-drying 4h under conditions of humidity is 95%, 25 DEG C,
Obtain autoreduction dust agglomerate.Autoreduction agglomerate roasting certain time in rotary hearth furnace can realize the good of slag ferrum
Molten point, produce superior in quality pearl ferrum.
Embodiment 2
Such as embodiment 1 into, dust is changed tail ash and electric furnace ash, is the ratio mixing of 3:7 the most in mass ratio,
Its composition is shown in Table 2, and flux uses spodumene, with addition of 2% that amount is mixed dust quality.The autoreduction made
Agglomerate roasting in rotary hearth furnace certain short time can realize good molten point and the reduction degree of iron oxides of slag ferrum
Higher than 90%, the pearl ferrum produced can be directly used for steel-making or iron-smelting process.
Table 1 embodiment 1 dust main component
Table 2 embodiment 2 dust main component
Claims (7)
1. under a low temperature, utilize the method that Dust of Iron And Steel Works produces pearl ferrum, it is characterised in that:
Step one, the compacting of autoreduction dust agglomerate: the dust after drying first passes through with addition of quick lime and silicon
Stone regulation basicity, mix by C/O=0.7～1.1 with reducing agent subsequently, and allocate into binding agent and
It is pressed into agglomerate after flux mix homogeneously, maintenance 72h post-drying 4h in curing box, obtain having certain
The autoreduction dust agglomerate of cold strength is standby；
Step 2, molten point of the reduction of autoreduction dust agglomerate: at rotary hearth furnace bottom refractory material upper berth thick layer about
The coke powder of 5～10mm, then spreads 1～2 layer of autoreduction dust agglomerate above, and rotary hearth furnace is with coal, coal gas
Or fire box temperature is increased to 1250～1350 DEG C as fuel by burner by oil, at this temperature constant temperature 10～
30min, finally obtains the degree of metalization pearl ferrum more than 90%.
Step 3, pearl ferrum and the separation of skull: first product is entered together with being embedded in skull by the pearl ferrum of production
Row is broken, realizes the separation of slag ferrum followed by magnetic separation, and after magnetic separation, the pearl ferrum of gained can be directly used for ironmaking or refining
Steel operation.
2. utilizing the method that Dust of Iron And Steel Works produces pearl ferrum under low temperature as claimed in claim 1, its feature exists
In: described is 0.5～1.5 by regulating pelletizing dual alkalinity with addition of quick lime and Silicon stone.
3. utilizing the method that Dust of Iron And Steel Works produces pearl ferrum under low temperature as claimed in claim 1, its feature exists
In: described flux red bauxite mass percent requires: Al2O3>=40,18%≤SiO2≤ 30%, Fe2O3>=10%.
4. utilizing the method that Dust of Iron And Steel Works produces pearl ferrum under low temperature as claimed in claim 1, its feature exists
In: described flux spodumene (LiAl [Si2O6]) mass percent requirement: 3.0% < Li2O < 7.0%,
17% < Al2O3≤ 25%, SiO2< 80%.
5. utilizing the method that Dust of Iron And Steel Works produces pearl ferrum under low temperature as claimed in claim 1, its feature exists
In: described flux with addition of amount for mixing after dust quality 1%～5%.
6. utilizing the method that Dust of Iron And Steel Works produces pearl ferrum under low temperature as claimed in claim 1, its feature exists
In: described binding agent is cement, with addition of quality be compound mixing after dust quality 10%.
7. utilizing the method that Dust of Iron And Steel Works produces pearl ferrum under low temperature as claimed in claim 1, its feature exists
In: described reducing agent is coke powder.
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| CN201610306128.XA CN105925744B (en) | 2016-05-10 | 2016-05-10 | The method of Dust of Iron And Steel Works production pearl iron is utilized under a kind of low temperature |
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| CN201610306128.XA CN105925744B (en) | 2016-05-10 | 2016-05-10 | The method of Dust of Iron And Steel Works production pearl iron is utilized under a kind of low temperature |
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| CN105925744A true CN105925744A (en) | 2016-09-07 |
| CN105925744B CN105925744B (en) | 2018-05-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981216A (en) * | 2021-10-21 | 2022-01-28 | 广东华欣环保科技有限公司 | Method for treating undersize powder of metallized pellet of rotary hearth furnace |
| CN114774683A (en) * | 2022-04-21 | 2022-07-22 | 宝武集团环境资源科技有限公司 | System and method for resource utilization of iron-zinc-containing dust mud |
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| CN102277462A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for comprehensive utilization of vanadium titanomagnetite |
| CN102277461A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for directly restoring industrial waste residue through rotary hearth furnace |
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| CN102277462A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for comprehensive utilization of vanadium titanomagnetite |
| CN102277461A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for directly restoring industrial waste residue through rotary hearth furnace |
| CN102776309A (en) * | 2012-07-19 | 2012-11-14 | 中冶南方工程技术有限公司 | Treatment method of zinc-bearing dust for steel works |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981216A (en) * | 2021-10-21 | 2022-01-28 | 广东华欣环保科技有限公司 | Method for treating undersize powder of metallized pellet of rotary hearth furnace |
| CN113981216B (en) * | 2021-10-21 | 2023-02-28 | 广东华欣环保科技有限公司 | Treatment method of undersize powder of metallized pellet of rotary hearth furnace |
| CN114774683A (en) * | 2022-04-21 | 2022-07-22 | 宝武集团环境资源科技有限公司 | System and method for resource utilization of iron-zinc-containing dust mud |
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| CN105925744B (en) | 2018-05-01 |
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