CN102094095B - Method for quickly separating and directly reducing iron slag - Google Patents
Method for quickly separating and directly reducing iron slag Download PDFInfo
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- CN102094095B CN102094095B CN 201110031545 CN201110031545A CN102094095B CN 102094095 B CN102094095 B CN 102094095B CN 201110031545 CN201110031545 CN 201110031545 CN 201110031545 A CN201110031545 A CN 201110031545A CN 102094095 B CN102094095 B CN 102094095B
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Abstract
The invention relates to a method for quickly separating and directly reducing iron slag, and belongs to the technical field of metallurgy. The method comprises the following steps of: mixing mineral powder, an auxiliary agent, a catalyst, a carrier and a binder according to a proportion, spraying water, uniformly stirring, pressing into pellets with the diameter of 18 to 22mm, mixing the dried pellets and a reducing agent in a mass ratio of 70:30, putting into a material pool of a reducing vehicle, putting into a kiln, and performing reduction reaction at the temperature of between 1,250 and 1,280 DEG C for 3 to 6 hours; cooling to the temperature of 200 DEG C and discharging the reduced mixture of metal slag, iron and reducing agent tailing; milling by using a vibration mill, sieving gravel iron and slag blocks, and performing magnetic separation to obtain high-grade metal iron powder and metal gravel iron; and performing cold pressing on the metal iron powder to obtain iron blocks with the high density of more than or equal to 4.2t/m<3>. The method improves the grade of metal iron; meanwhile, the content of the iron in the tailing is below 4 percent, and the recovery rate of the metal iron is over 95 percent.
Description
Technical field
The method that a kind of slag iron of the present invention separates fast direct reducing belongs to metallurgical technology field.
Background technology
Traditional dri (sponge iron) smelting technology is reduction coal and lime powder or limestone powder uniform mixing in proportion, forms reductive agent, reductive agent again with brown iron oxide, packing into by certain arrangement seals tighter vessel in heating and reduces.
Traditional direct method of reducing only is fit to the TFe >=high grade iron breeze more than 66% or direct reduction of easy ore dressing, the reduced iron that sub-elects at last (sponge iron) TFe must >=88% just can be salable product, (national standard is arranged).
Powdered iron ore or ore are when directly reducing; As long as possess enough reduction temperatures, enough recovery time, certain reduction pressure and fully during four conditions of reducing atmosphere; Be to become metal simple-substance iron to all red stone drastic reductions; But, not every by drastic reduction reduced iron can both be sorted into TFe >=88%, even TFe >=90%; Because separating the basic reason of magnetic separation behind restriction reduction reaction speed and the drastic reduction is the structures of mineral in gangue; Why difficult choosing is because his structure in ore is a fine crystallization in difficult ore dressing, or surrounds, inlay, bonded structure, so in traditional ore-dressing technique, be difficult to obtain the result of satisfaction.Be the finished product after having only the above high grade iron breeze of TFe >=66% by drastic reduction; Perhaps the red stone molecular crystal particle of ore is big, and red stone molecule and gangue crystallization are the association shape, and the mineral that ore is easy to sorting at roasting rear oxidation iron molecule and gangue just have the value of reduction, sorting.
Adopting traditional magnetizing roasting or drastic reduction technology also to be difficult to reductive agent to be contacted effectively the housing breakthrough with ore reduces.
Even if reasons such as the thin especially or iron molecule existing way of the iron molecule crystalline texture of this iron ore is special are through after the magnetizing roasting, perhaps behind the drastic reduction; Be polished to-200 orders, even behind-300 orders, its single particle also is the egg shape; Egg yolk is a gangue, and Ovum Gallus domesticus album is a red stone, can't upgrade; Here it is is defined as slow-witted ore deposit by country, also is difficult ore dressing (as: oolitic hematite, antelope stone iron ore etc.), complex ore (as: ilmenite, ferric metasilicate, red soil nickel ore, paigeite etc.).
As for ferruginous chemical industry tailings; Though its iron grade has the value of recycling; But the iron ore natural because of its red stone molecular crystal texture ratio also has complicacy, is difficult to efficient recovery and utilizes, so a large amount of this waste residues is left unused, abandons (as: sulfate cinder, alumina laterite, copper melting waste slag, lead-zinc smelting waste residue, chromium waste residue, dedusting mud etc.); China's this waste residue that is difficult to recycle of will draining every year has more than one hundred million ton; Have to become solid waste, also will occupy large stretch of the arable land simultaneously, had a strong impact on environment.
Summary of the invention
To above-mentioned shortcoming; The present invention a kind of slag iron method of separating fast direct reducing; Be intended to catalyzer and auxiliary agent when the high temperature reduction, with the iron molecule of ore body own be parcel, inlay, complex construction such as bonding destroys CO and oxygenant Fe that reductive agent is volatilized
+Effectively contact, also reduced the fusing point of gangue and metallic iron, make it in this pelletizing large space, be fusion and semi-melting state, also accelerate the process of reduction reaction simultaneously.
A kind of slag iron of the present invention separates the method for fast direct reducing, as shown in Figure 1ly carries out according to following steps:
(1) with ore powder, auxiliary agent, catalyzer, carrier and sticker by quality than powdered iron ore: auxiliary agent: catalyzer: carrier: sticker=(74～82): (7～11): (0.03～0.05): (8～12): (0.3-0.4) water spray evenly stirs, and makes total moisture content be controlled at 5%～6%.Be pressed into the pelletizing of diameter 18mm～22 mm again.
(2) pelletizing and the reductive agent of oven dry are mixed to pack into by mass ratio 70:30 reduce in the material pond of car.
(3) get into kiln, under 1250 ℃～1280 ℃ temperature, carry out reduction reaction, the recovery time is 3～6h;
(4) metallic iron produced of reduction and the mixture of slag, be cooled to 200 ℃ after discharging, the mixture of the scraps that is reduced out, iron and reductive agent tail powder;
(5) after the vibration mill polishing, sieve out gravel iron and clinker, carry out magnetic separation again, magneticstrength is 1200～3200Gs, and the back obtains high-grade metal iron powder and metal gravel iron;
(6) be cold-pressed into density>=4.2t/m to metal iron powder
3, the high-density iron block of monolithic weight about 5Kg.
Above-mentioned reductive agent is that hard coal and the lime powder of granularity 0～5mm is by mass ratio 90:10 uniform mixing.
Above-mentioned catalyzer is a borax.
Above-mentioned auxiliary agent is by mass percentage: quicklime 20～40%, yellow soda ash 0～30%, sodium-chlor 0～20.0%, Calcium Fluoride (Fluorspan) 20～60%.
Above-mentioned carrier is common carbon dust, and wherein each composition quality per-cent is fixed carbon 65-68%, fugitive constituent 12-22%, ash 10-25%.
The method that a kind of slag iron of the present invention separates fast direct reducing; Not only reach the purpose of fast restore; The reduction of slag iron, sorting that metallic iron between the unit of making and metallic iron reunion simultaneously, core gangue and appearance gangue are reunited; After the material to be restored cooling, its iron material that has been reduced is transformed into the material that is very easy to polishing, magnetic separation.Not only improve the metallic iron grade, made it become qualified dri product, the iron level of mine tailing is reached below 4%, obtained the metallic iron recovery very high more than 95%.
A kind of slag iron of the present invention separates the method for fast direct reducing and has abandoned ore beneficiation, pellet sintering and coal washing, coking; Arrive the complicacy of blast-furnace smelting, operation, link such as loaded down with trivial details again; Not only practiced thrift great amount of investment; For the owner obtains considerable economic, also reduced a large amount of exhaust gas emissions simultaneously.Realize " non-Jiao " ironmaking, also promoted the development of short flow process steel-making simultaneously.
Description of drawings
Fig. 1 separates the process flow sheet of fast direct reducing for slag iron.
Embodiment
The detailed description of a kind of slag iron of the present invention being separated the method for fast direct reducing below in conjunction with embodiment.
The yl-pellet binder of the sticker that uses in following examples for buying from Xuanlong Chemical Co., Ltd., Zibo.
Following examples are to pack a reduction material to heat in the inherent silicon carbide rod furnace of crucible into to carry out reductive.
Embodiment 1
Hard coal and the lime powder of granularity 0～5mm are pressed mass ratio 90:10 uniform mixing, as reductive agent; With mass percent is 35.0% quicklime, and 10.0% yellow soda ash, 55.0% Calcium Fluoride (Fluorspan) mix as auxiliary agent;
Catalyzer is a borax; Carrier is commercial common carbon dust, and wherein each composition quality per-cent is fixed carbon 65-68%, fugitive constituent 12-22%, ash 10-25%; Sticker is the high polymer binder of market purchasing.
With Yunnan oolitic hematite powdered iron ore, auxiliary agent, reductive agent, carrier and the sticker of TFe=50.46% by quality than powdered iron ore: auxiliary agent: catalyzer: carrier: sticker=82:7:0.05:10:0.4 water spray evenly stirs, and makes total moisture content be controlled at 5%～6%.Be pressed into the pelletizing of diameter 18mm～22 mm again.Pelletizing and the reductive agent of oven dry mixes to pack into by mass ratio 70:30 and reduces in the material pond of car.Get into kiln,
1270 ℃Carry out reduction reaction under the temperature, the recovery time is 4h, the metallic iron produced of reduction and the mixture of slag, be cooled to 200 ℃ after discharging; After the vibration mill polishing, sieve out gravel iron and clinker, carry out magnetic separation again, magneticstrength is 3200Gs, and the back obtains high-grade metal iron powder and metal gravel iron; Be cold-pressed into density>=4.2t/m to metal iron powder
3, the high-density iron block of monolithic weight about 5Kg.
Resultant performance of products is as shown in table 1.
Table 1
Embodiment 2
Hard coal and the lime powder of granularity 0～5mm are pressed mass ratio 90:10 uniform mixing, as reductive agent; With mass percent is 20.0% quicklime, 10.0% yellow soda ash, and 30.0% sodium-chlor, 30.0% Calcium Fluoride (Fluorspan) mix as auxiliary agent; Catalyzer is a borax; Carrier is commercial common carbon dust, and wherein each composition quality per-cent is fixed carbon 65-68%, fugitive constituent 12-22%, ash 10-25%; Sticker is the high polymer binder of market purchasing.
With Guangxi oolitic hematite powdered iron ore, auxiliary agent, reductive agent, carrier and the sticker of TFe=45.12% by quality than powdered iron ore: auxiliary agent: catalyzer: carrier: sticker=74:10:0.03:12:0.4 water spray evenly stirs, and makes total moisture content be controlled at 5%～6%.Be pressed into the pelletizing of diameter 18mm～22 mm again.Pelletizing and the reductive agent of oven dry mixes to pack into by mass ratio 70:30 and reduces in the material pond of car.Get into kiln,
1250 ℃Carry out reduction reaction under the temperature, the recovery time is 3h, the metallic iron produced of reduction and the mixture of slag, be cooled to 200 ℃ after discharging; After the vibration mill polishing, sieve out gravel iron and clinker, carry out magnetic separation again, magneticstrength is 1200Gs, and the back obtains high-grade metal iron powder and metal gravel iron; Be cold-pressed into density>=4.2t/m to metal iron powder
3, the high-density iron block of monolithic weight about 5Kg.
Resultant performance of products is as shown in table 2.
Table 2
Embodiment 3
Hard coal and the lime powder of granularity 0～5mm are pressed mass ratio 90:10 uniform mixing, as reductive agent; With mass percent is that 40.0% quicklime, 60.0% Calcium Fluoride (Fluorspan) mix as auxiliary agent; Catalyzer is a borax; Carrier is commercial common carbon dust, and wherein each composition quality per-cent is fixed carbon 65-68%, fugitive constituent 12-22%, ash 10-25%; Sticker is the high polymer binder of market purchasing.
With Shandong alumina laterite, auxiliary agent, reductive agent, carrier and the sticker of TFe=19.75% by quality than powdered iron ore: auxiliary agent: catalyzer: carrier: sticker=79.5:11:0.04:8:0.4 water spray evenly stirs, and makes total moisture content be controlled at 5%～6%.Be pressed into the pelletizing of diameter 18mm～22 mm again.Pelletizing and the reductive agent of oven dry mixes to pack into by mass ratio 70:30 and reduces in the material pond of car.Get into kiln,
1280 ℃Carry out reduction reaction under the temperature, the recovery time is 6h, the metallic iron produced of reduction and the mixture of slag, be cooled to 200 ℃ after discharging; After the vibration mill polishing, sieve out gravel iron and clinker, carry out magnetic separation again, magneticstrength is 2200Gs, and the back obtains high-grade metal iron powder; Be cold-pressed into density>=4.2t/m to metal iron powder
3, the high-density iron block of monolithic weight about 5Kg.
Resultant performance of products is as shown in table 3.
Table 3
Claims (3)
1. a slag iron separates the method for fast direct reducing, it is characterized in that carrying out according to following steps:
(1) with ore powder, auxiliary agent, catalyzer, carrier and sticker by quality than ore powder: auxiliary agent: catalyzer: carrier: sticker=(74～82): (7～11): (0.03～0.05): (8～12): (0.3-0.4) water spray evenly stirs; Make total moisture content be controlled at 5%～6%, be pressed into the pelletizing of diameter 18mm～22mm again; Said catalyzer is a borax; Said auxiliary agent is by mass percentage: quicklime 20～40%, yellow soda ash 0～30%, sodium-chlor 0～20.0%, Calcium Fluoride (Fluorspan) 20～60%;
(2) pelletizing and the reductive agent of oven dry are mixed to pack into by mass ratio at 70: 30 reduce in the material pond of car;
(3) get into kiln, under 1250 ℃～1280 ℃ temperature, carry out reduction reaction, the recovery time is 3～6h;
(4) metallic iron produced of reduction and the mixture of slag, be cooled to 200 ℃ after discharging, the mixture of the scraps that is reduced out, iron and reductive agent tail powder;
(5) after the vibration mill polishing, sieve out gravel iron and clinker, carry out magnetic separation again, magneticstrength is 1200～3200Gs, and the back obtains high-grade metal iron powder and metal gravel iron;
(6) be cold-pressed into density>=4.2t/m to metal iron powder
3, the high-density iron block of monolithic weight 5Kg.
2. the method for separating fast direct reducing according to the said a kind of slag iron of claim 1 is characterized in that said reductive agent is granularity 0～5mm and is not that 0 hard coal and lime powder are by 90: 10 uniform mixing of mass ratio.
3. a kind of slag iron according to claim 1 separates the method for fast direct reducing, it is characterized in that said carrier is common carbon dust, and wherein each composition quality per-cent is fixed carbon 65-68%, fugitive constituent 12-22%, ash 10-25%, above components total 100%.
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| US9435005B2 (en) | 2012-04-16 | 2016-09-06 | Outotec (Finland) Oy | Method for processing slags of non-ferrous metallurgy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102321777A (en) * | 2011-08-26 | 2012-01-18 | 沈阳博联特熔融还原科技有限公司 | Method for reducing iron |
| CN102424874A (en) * | 2011-12-05 | 2012-04-25 | 武汉科技大学 | Oolitic hematite aluminum and iron separation method |
| CN102936653B (en) * | 2012-11-23 | 2014-05-07 | 沈阳博联特熔融还原科技有限公司 | Method for reducing high-density metallized pellet |
| CN104195277B (en) * | 2014-09-10 | 2016-06-15 | 连云港市东茂矿业有限公司 | The method reclaiming reduced iron powder from Pb-Zn deposits metallurgical slag |
| CN105710105B (en) * | 2016-01-13 | 2018-01-05 | 河南城建学院 | A kind of red mud selects the integral preparation method of iron and its tailings base foamed light walling |
| CN107262731B (en) * | 2017-06-14 | 2019-06-21 | 唐竹胜 | Stocking/component of machine product method is forged in a kind of powdery iron ore direct reduced iron hot pressing |
| CN109881018A (en) * | 2019-03-12 | 2019-06-14 | 济源市中亿科技有限公司 | A method of recycling arsenic iron calcium from arsenic iron calcium slag |
| CN112939572A (en) * | 2019-12-11 | 2021-06-11 | 桂阳县皓钰新材料有限公司 | Process for treating iron slag of steel plant by tunnel kiln |
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| CN1903487A (en) * | 2006-08-10 | 2007-01-31 | 武汉科技大学 | Method for producing iron granules by using iron ore powder |
| CN101386896A (en) * | 2008-09-24 | 2009-03-18 | 吴道洪 | Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration |
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| US20090095129A1 (en) * | 2007-10-11 | 2009-04-16 | Ali Basdag | Process for enhancing dry compressive strengsth in iron ore pelletizing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1903487A (en) * | 2006-08-10 | 2007-01-31 | 武汉科技大学 | Method for producing iron granules by using iron ore powder |
| CN101386896A (en) * | 2008-09-24 | 2009-03-18 | 吴道洪 | Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9435005B2 (en) | 2012-04-16 | 2016-09-06 | Outotec (Finland) Oy | Method for processing slags of non-ferrous metallurgy |
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Owner name: LIAONING BOLIAN SPECIAL METALLURGY TECHNOLOGY CO., Free format text: FORMER NAME: SHENYANG BRILLIANT SMELTING REDUCTION TECHNOLOGY CO., LTD. |
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Address after: 113123, the east side of Zhongxing Street, Fushun Economic Development Zone, Liaoning Province, seven North of Shen Dong Road, block D14d Patentee after: LIAONING BRILLIANT METALLURGY TECHNOLOGY Co.,Ltd. Address before: 110006 Shenyang, Liaoning 69199138-3 Patentee before: SHENYANG BRILLIANT SMELTING REDUCTION TECHNOLOGY Co.,Ltd. |
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