CN102766718B - Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash - Google Patents

Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash Download PDF

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CN102766718B
CN102766718B CN2012102586935A CN201210258693A CN102766718B CN 102766718 B CN102766718 B CN 102766718B CN 2012102586935 A CN2012102586935 A CN 2012102586935A CN 201210258693 A CN201210258693 A CN 201210258693A CN 102766718 B CN102766718 B CN 102766718B
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iron
zinc
blast furnace
slag
kiln
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CN2012102586935A
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CN102766718A (en
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赵沛
郭培民
庞建明
葛雷
杜东辉
杨龙进
张威
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新冶高科技集团有限公司
武汉北湖胜达制铁有限公司
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    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

A method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash belongs to the technical field of the comprehensive utilization of steel mill wastes. The method comprises the preparation process: reducing blast furnace zinc-containing ash in a rotary kiln so as to obtain the zinc-rich materials, synchronously crushing the cooled iron slag, and then separating the iron-rich materials from the slag by magnetic separation, wherein the CO volume concentration in the gas of the rotary kiln meets the condition that CO/(CO2+CO) is more than 70%, and the temperature of the gas in the kiln is 1150 DEG C to 1300 DEG C; the water content when the blast furnace zinc-containing ash is fed in the kiln is 10wt% to 30wt%; the mass content of carbon in the furnace material component fed into the rotary kiln is not less than 20wt%; in the slag ion mixture obtained by the reducing in the rotary kiln, the reducing rate of iron is not lower than 85% and the metal iron particle size is not less than 0.1mm; the average particle size of the slag iron mixture before being fed into the magnetic separator is 0.05mm-0.2mm; and the full iron content in the separated metal ion product is not lower than 85wt%, and the metalizing rate is not less than 85wt%. The method has the following advantages: the valuable metals and dangerous heavy metals in the blast furnace ash are used effectively, and the high-quality sponge iron and zinc-rich materials are obtained.

Description

Utilize blast furnace to contain the method that zinc gray is produced sponge iron and rich zinc material
Technical field
The invention belongs to steel mill's waste ' s reclamation technical field, particularly provide a kind of blast furnace that utilizes to contain the method that zinc gray is produced sponge iron and rich zinc material, be applicable to the comprehensive treating process that blast furnace contains zinc gray.
Background technology
The annual blast-furnace dust that produces about ten-million-ton scale of China's steel industry, blast-furnace dust contains the harmful elements such as zinc, lead, arsenic, simply blast-furnace dust is poured onto to field or landfill, these heavy metal elements can little by little leach under the effect of rainwater, pollute Soil Surrounding, river, underground water, bring disaster to farm crop and animal, finally the mankind are produced to harm.Current blast furnace contains zinc gray and the impact of environment has been caused to the attention of people and government.
It is directly blast furnace to be contained to zinc gray to use at Steel Plant's internal recycle that China's blast furnace the earliest contains the zinc gray method of resource, namely use it as a kind of raw materials for sintering, but the circulation enrichment meeting of zinc in blast furnace shortened the life-span of furnace lining and causes furnace nodulation, affects the normal running of blast furnace.
Existing Physical is processed blast furnace and is contained the various combination technique that zinc gray technique mainly contains magnetic method, gravity separation method, flotation process, hydrocyclone staging and this several method.Shortcoming is that the iron ore grade of selecting recovery rate lower, iron is lower.
There are the following problems for wet processing process: the leaching yield of zinc lead is lower, and leached mud both had been difficult to as raw material in Steel Plant's recycle, also can not meet the stacking requirement that environmental law proposes; Unit operation is too much, and leaching agent consumes more, and cost is higher; Equipment corrosion is serious, and most of operational conditions are more severe; More responsive to raw material ratio, make technique be difficult to optimize; The sulphur of introducing in treating processes, chlorine etc. easily cause new environmental pollution.
Adopt at present the pyrogenic attack blast furnace to contain the method for zinc gray mainly from Japan, a kind of is early stage rotary kiln technology, more representational is the SPM(Sumitomo Pre-reduction Method of SUMITOMO CHEMICAL metal exploitation) technique, traditional smelting in rotary kiln high-grad iron ore deposit being produced to the main thought succession of sponge iron technique comes, at first by after various slurry dewaterings, with various dust and reductive agent, mix, then compound is joined in rotary drying kiln, by drying, produce original pelletizing; Then original pelletizing is joined in rotary kiln, process preheating and reduction, dezincification, obtain prereduced burden, and it is cooling that prereduced burden passes through rotary kiln again, will be greater than the product of 7 ㎜ as the blast furnace feeding material by screening; The powder that is less than 7 ㎜ needs sintering again.
The rotary kiln of Japan's exploitation is processed blast furnace and is contained zinc gray, focus on removing the zinc in blast-furnace dust, and iron product is of poor quality, shows that slag iron mixes, and degree of metalization is lower, can only use as blast furnace burden.Namely by rotary kiln technology, the zinc in blast-furnace dust is removed, and then as the raw material of blast furnace.Certainly with directly blast furnace is contained to zinc gray as blast furnace raw material, technical progress is still arranged.
Along with the development of technology, the rotary kiln of Japan is processed blast furnace and is contained the rotary hearth furnace that the zinc gray technology developed afterwards and replace.Rotary hearth furnace can be preferably by zinc from blast-furnace dust, separating, obtain simultaneously the iron content pelletizing of certain degree of metalization.Ma Gang has introduced 1 cover processing blast furnace from Japan several years ago and has contained the rotary hearth furnace that zinc gray is used.Rotary hearth furnace contains in the zinc gray practice and has some outstanding problems at the processing blast furnace, show: (1) rotary hearth furnace process dust is large, although by pressure ball and drying treatment, but in carbonaceous pelletizing, there is a certain amount of water, it is added suddenly to the condition of high temperature, easily explosion, practice shows that Dust Capacity can reach 30% level, need to process, both increased energy consumption, worsen again the technique direct motion; (2) high-temperature heat-exchanging easily stops up, and because Dust Capacity is large, particularly contains the dust such as zinc, lead and is easy to be bonded on heat exchanger wall, affects heat exchange efficiency, and the time has been grown, and affects the technique direct motion; (3) iron product is of poor quality, at the rotary hearth furnace that adopts oxidizing atmosphere, reclaim zinc, affect the reduction of iron, practice shows that degree of metalization is lower, between 50~70%, simultaneously a large amount of gangues and metallic iron mix, and product is not sponge iron, can only be added in converter or blast furnace as refrigerant or common furnace charge.
China also contains the comprehensive utilization technique of zinc gray at the research blast furnace in this century, application number 200710193281.7 and 201110040852.X apply for a patent, adopt Japan's rotary kiln reduction technique in last century, zinc enrichment by blast-furnace dust, ferric charge is as the raw material of blast furnace simultaneously, Here it is Japan last century way, the rotary hearth furnace technology of having been developed afterwards replaces.
As seen from the above analysis, at present to contain the utilization of zinc gray be mainly dezincify to blast furnace, and utilizing of iron is poor, and its Major Difficulties is that the iron that blast furnace contains in zinc gray is lower, normally lower than 40%, that so low iron content and slag mixture separation difficulty is very large,
Application number is 200810058950.4 applies for a patent, the way that the method for the employing Ultrafine Grinding slag iron reduzate that reduction obtains to rotary kiln carries out magnetic separation, obtain iron content and be 50%~70% fine ore, but because the iron crystal grain after reduction is trickle, be difficult to effectively with slag, separate, cause the recovery rate of iron to only have 50% left and right horizontal, and part iron is secondary oxidation in the process of selective grinding, iron product can only be also fine ore, is not sponge iron, causes the wasting of resources.
Except the low reason of iron level, second major reason be the iron reduction to need reducing atmosphere, rotary hearth furnace be weak oxide atmosphere, in the slag iron mixture, the degree of metalization of iron is low.Rotary kiln reduction blast furnace contains zinc gray, applies for a patent from both domestic and external, only controls reduction temperature, the reducing atmosphere of not mentioned control kiln hood, so the degree of metalization of iron also is difficult to guarantee.
It is low that blast furnace contains in zinc gray iron level, and the reducing atmosphere of smelting equipment is difficult to guarantee at present simultaneously, is that current blast furnace contains the poor major reason of iron resources utilization in zinc gray.
Summary of the invention
The object of the present invention is to provide a kind of blast furnace that utilizes to contain the method that zinc gray is produced sponge iron and rich zinc material, can make sponge iron, make all iron content be greater than 85%, degree of metalization is greater than 85%.
Core difficult point of the present invention is to improve blast furnace to contain the smelting parameter that zinc gray is produced the iron product degree of metalization, guarantees simultaneously the favourable condition that follow-up metallic iron and slag fully separate.
Preparation flow of the present invention is that the reduction blast furnace contains zinc gray and obtains rich zinc material in rotary kiln, simultaneously cooled slag iron is carried out to fragmentation, then separates slag and rich iron substance by magnetic separation.The technical parameter of controlling in technique is:
In revolution kiln hood coal gas, the CO volumetric concentration meets CO/ (CO 2+ CO) 70% and the kiln hood gas temperature be 1150 ℃~1300 ℃; Water content when blast furnace contains zinc gray and enters stove is at 10~30wt%; Enter carbonaceous amount content in the charge composition of rotary kiln and be not less than 20%; In the slag iron mixture that the rotary kiln reduction obtains, the reduction ratio of iron is not less than 85wt% and the metallic iron particle size is not less than 0.1mm; Enter the mean particle size 0.08mm-0.2mm of the front slag iron mixture of magnetic separator; In metallic iron product after separation, all iron content is not less than 85wt%, and degree of metalization is not less than 85wt%.
Method of the present invention, when blast furnace contains carbon content in zinc gray lower than 20 wt%, can be with addition of carbonaceous fuels such as part coal dust or coke powders, guarantee that in feed stock for blast furnace, carbonaceous amount content reaches 20 wt%(to enter charge composition calculating) more than, the carbonaceous fuel of adding can with from the kiln tail, add in kiln after blast furnace contains zinc gray and mixes, also can spray into the kiln internal combustion from kiln hood.
Method of the present invention, hot metal iron and the cooling employing shrend of the slag mixture type of cooling that the rotary kiln reduction obtains, or the type of cooling (is that water coolant does not directly contact with furnace charge indirectly, but utilize the mode such as cylinder that the furnace charge heat is passed to water coolant by the contact wall), hot metal iron and slag mixture that these two kinds of methods can effective cooling present method obtain
Method of the present invention, method according to claim 1, it is characterized in that: described slag iron mixture is milled down to 0.08mm-0.2mm by ball mill by the mean particle size of this slag iron mixture, or adds that by fragmentation the mode of ball milling is milled down to 0.08mm-0.2mm by the mean particle size of slag iron mixture.
Method of the present invention, adopt wet magnetic separator that the slag iron mixture is separated into to metal iron powder and slag.
Method of the present invention, separate magnetic separation the moisture metal iron powder drying obtained, and water-content is less than 2 wt %.
Method of the present invention, directly used dried metal iron powder, or use by being cold-pressed into sponge iron blocks or ball.
Under the principle of the invention is further set forth:
In order to improve the degree of metalization of iron product, the selection of reactor is very important, and from current reactor, rotary hearth furnace is difficult to guarantee reducing atmosphere, so the present invention selects rotary kiln as smelting equipment.In order to prevent the secondary oxidation in rotary kiln, applicant's research shows, in the coal gas of rotary kiln end, the CO volumetric concentration meets CO/ (CO 2+ CO)>70%, can guarantee that blast furnace contains the abundant reduction of ferric oxide in zinc gray, obtain high degree of metalization, surpass 85%.
Except the reducing atmosphere of controlling kiln hood, it is tiny that blast furnace contains the granularity of the materials such as carbon in zinc gray and ferric oxide, and fully contact simultaneously, guaranteed that blast furnace contains the fast restore of zinc gray.
Normal rotary kiln end reduction temperature is lower than 1100 ℃, the iron crystal grain obtained after reduction is very tiny, active high, easily secondary oxidation, also be difficult to separate simultaneously, cause the later separation difficulty, need degree of depth ball milling (need to be milled down to 200 orders, even 300 orders or 400 orders), cause on the other hand the secondary oxidation of trickle abrasive grit, the present poor product quality of final body, can not get the sponge iron that iron level is high, the recovery rate of iron is on the low side simultaneously.In order to obtain the sponge iron that iron level is high, need to adjust the smelting temperature of traditional rotary kiln, the present invention's research shows, the reduction temperature of kiln hood is controlled at 1150 ℃~1300 ℃, guarantee that blast furnace contains the abundant fast restore of zinc gray, also can allow the tiny metal abrasive grit that reduction process forms be grown up, the granularity of metallic iron can reach the 0.1mm level, reduces the magnetic separation separating difficulty of postorder and has improved the recovery rate of iron.To contain in zinc gray iron level low due to blast furnace, and gangue content is high and fusing point is higher, therefore moderately improves reduction temperature, and the kiln hood dross is less, guarantees continuously above level operation half a year.
In order to prevent that blast furnace from containing the airborne dust of zinc gray in rotary kiln, adopt the moisture content method that blast furnace contains zinc gray of controlling.Our research shows, it is more suitable 10~30% that blast furnace contains the moisture control of zinc gray.The moisture content that blast furnace contains in zinc gray is very few, and dust emission is large; Cross wetly, blast furnace contains zinc gray and moves difficulty.
Blast furnace contains zinc gray and in heating and reduction process, needs to have the carbon of enough quality, this research shows, when the blast furnace that enters kiln contains the zinc gray carbon content and reaches 20% above level, do not need extra fuel, when the blast furnace that enters kiln contains zinc gray carbon content less than 20%, should supplement part of fuel, guarantee that carbon content reaches 20% above level.The carbonaceous fuels such as the coal dust supplemented or coke powder can contain after zinc gray is mixed with blast furnace and add rotary kiln, also can from kiln hood, spray in rotary kiln separately.
At the kiln hood high-temperature area, except the reduction of ferric oxide, the zinc that blast furnace contains in zinc gray also is reduced into zinc fume by carbon, moves to the kiln tail with air-flow, and the reduction along with temperature, become fine solid particle, finally in receiving ash system, reclaims zinc-containing dust and obtains rich zinc material.
In analyzing in the above, the present invention proposes Novel smelting system (comprise and smelt atmosphere control, temperature control and contain moisture content and the carbon content control of zinc gray to entering the stove blast furnace), guarantee that blast furnace contains iron and the zinc drastic reduction in zinc gray, also impel simultaneously the trickle abrasive grit after reduction to grow up and the technique direct motion, obtain high degree of metalization and metallic iron and the slag mixture of certain particle size size are arranged.
Hot metal iron and slag mixture need cooling, the existing shrend type of cooling, the indirect type of cooling is also arranged, and (water coolant does not directly contact with furnace charge, but utilize the mode such as cylinder that the furnace charge heat is passed to water coolant by the contact wall), hot metal iron and slag mixture that these two kinds of methods can effective cooling present method obtain.
In the process of the test of magnetic separation, as long as the metallic iron that the present invention's reduction obtains and the mean particle size of slag mixture are crushed to 0.08mm-0.2mm, just can guarantee that metallic iron effectively separates with slag, the recovery rate of iron surpasses 90%.Therefore adopt conventional fragmentation, ball milling and wet magnetic separator, just can obtain the metal iron powder of higher degree.By conventional drying equipment, the water in metal iron powder is removed again.Drying installation can adopt drum dried equipment, and dried metal iron powder obtains sponge iron blocks by the cold pressing block device again, and its full iron and degree of metalization surpass 85%.
The blast furnace that utilizes proposed according to the object of the invention contains the method that zinc gray is produced sponge iron and rich zinc material, and we states in above content to the inventive method, a kind of method of utilizing blast furnace to contain zinc gray production sponge iron and rich zinc material,
The present invention can effectively utilize blast furnace to contain iron, carbon, the zinc resource in zinc gray, they are all fully separated, obtain sponge iron and rich zinc material, improve value-added content of product, farthest reduce the extra fuel amount simultaneously, cut down finished cost, so the present invention has higher society and economic worth.
The characteristics such as contain the zinc gray treatment process with other blast furnace and compare, the present invention has resource and takes full advantage of, and added value of product is high, and the few and production cost of fixed investment is low, be specially adapted to the processing that China contains the blast-furnace dustes such as zinc, lead.
The accompanying drawing explanation
Fig. 1 utilizes blast furnace to contain the schema that zinc gray is produced the method for sponge iron and rich zinc material.
Embodiment
Embodiment 1
The concrete long 36m of the rotary kiln used * internal diameter 2.4m that implements, 3 °, pitch angle, rotating speed is according to output adjustable (3~50,000 ton/years), generally at 0.3~1rpm.
Blast furnace contains the zinc gray composition in Table 1, and its carbonaceous amount content has surpassed 20%.Therefore not with addition of coal dust.
The implementing process flow process is shown in Fig. 1.By feeding system, blast furnace is contained to zinc gray and send into the kiln tail; The water content that blast furnace contains zinc gray is controlled at 15%; At kiln hood, be blown into air, the kiln hood gas temperature reaches 1230 ℃; In kiln hood coal gas, the CO volumetric concentration meets CO/ (CO simultaneously 2+ CO)=75%, be extracted into zinc-containing dust the receipts ash system and obtain rich zinc material from the kiln tail by induced draft fan; Metal iron powder and slag mixture after reduction is cooling by shrend, through broken, the mean particle size of mixture is crushed to below 1mm again, then by ball mill, the mean particle size of the mixture after fragmentation is milled down to the 0.1mm level, then by wet magnetic separator, mixture separation is become to metal iron powder and slag; Finally by the metal iron powder drying after magnetic separation, water-content is 0.5%, then becomes sponge iron blocks by briquetting.
The zinc gray composition obtained in enforcement is in Table 2; The sponge iron composition is in Table 3.Visible, the present invention can separate the volatile materials such as the Zn in blast-furnace dust, Pb well with iron, gangue three, and has obtained the high-quality sponge iron, and the recovery rate of iron is 93%.
Table 1 embodiment one blast-furnace dust main component/wt%
TFe CaO SiO 2 MgO Al 2O 3 C Zn Moisture content
25.8 5.7 11.3 4.1 1.7 21.6 4.6 15.1
Table 2 zinc gray main component/wt%
Zn Fe CaO SiO 2
53.2 5.1 1.3 2.7
Table 3 sponge iron main component/wt%
T.Fe M.Fe Degree of metalization
90.6 81.5 90
Embodiment 2
Rotary kiln used in enforcement is identical with embodiment one, distinguishes to some extent with embodiment one but the blast furnace used contains zinc gray composition (in Table 4).Therefore its carbon content is only 16.2%, at blast furnace, contains in zinc gray the coke powder (fixed carbon 85%) with addition of 6%, keeps reduction and the needed carbonaceous amount of heating.
By feeding system, the mixture that blast furnace is contained to zinc gray and coke powder is sent into the kiln tail; The water content that blast furnace contains zinc gray is controlled at 17% level; At kiln hood, be blown into air, the kiln hood gas temperature reaches 1250 ℃; In kiln hood coal gas, the CO volumetric concentration meets CO/ (CO simultaneously 2+ CO)=73%, be extracted into zinc-containing dust the receipts ash system and obtain rich zinc material from the kiln tail by induced draft fan; By the reduction after metal iron powder and the slag mixture by water cooling, through broken, the mean particle size of mixture is crushed to below 1mm again, then by ball mill, the mean particle size of the mixture after fragmentation is milled down to the 0.1mm level, then by wet magnetic separator, mixture separation is become to metal iron powder and slag; Finally by the metal iron powder drying after magnetic separation, water-content is 0.5%, then becomes sponge iron blocks by briquetting.
The zinc gray composition obtained in enforcement is in Table 5; The sponge iron composition is in Table 6, and the recovery rate of iron is 92%.
Table 4 embodiment two blast-furnace dust main component/wt% used
TFe CaO SiO 2 MgO Al 2O 3 C Zn Moisture content
24.6 5.5 10.9 3.7 1.9 16.2 4.8 19.3
Table 5 zinc gray main component/wt%
Zn Fe CaO SiO 2
57.5 4.7 1.2 2.4
Table 6 sponge iron main component/wt%
T.Fe M.Fe Degree of metalization
89.1 79.2 88.9
Embodiment 3
Rotary kiln used in enforcement is identical with embodiment one, distinguishes to some extent with embodiment one but the blast furnace used contains zinc gray composition (in Table 4).Its carbon content is only 16.2%, therefore supplements 6% coke powder (fixed carbon 85%), sprays into the kiln internal combustion from kiln hood.
By feeding system, blast furnace is contained to zinc gray and send into the kiln tail; The water content that blast furnace contains zinc gray is controlled at 19% level; At kiln hood, be blown into air and coke powder, the kiln hood gas temperature reaches 1210 ℃; In kiln hood coal gas, CO concentration meets CO/ (CO2+CO)=78% simultaneously, by induced draft fan, zinc-containing dust is extracted into to receive ash system from the kiln tail to obtain rich zinc material; Metallic iron after reduction and slag mixture is indirectly cooling by revolving drum, through broken, the mean particle size of mixture is crushed to below 1mm again, then by ball mill, the mean particle size of the mixture after fragmentation is milled down to the 0.1mm level, then by wet magnetic separator, mixture separation is become to metal iron powder and slag; Finally by the metal iron powder drying after magnetic separation, water-content is 0.5%, then becomes sponge iron blocks by briquetting.
Zinc gray in the zinc gray obtained in enforcement and sponge iron composition and embodiment two is all more close with the recovery rate of sponge iron composition and iron, show that the present invention can separate the volatile materials such as the Zn in blast-furnace dust, Pb well with iron, gangue three, and obtained the high-quality sponge iron.

Claims (6)

1. one kind is utilized blast furnace to contain the method that zinc gray is produced sponge iron and rich zinc material, and technical process is that the reduction blast furnace contains zinc gray and obtains rich zinc material in rotary kiln, simultaneously cooled slag iron is carried out to fragmentation, then separates slag and rich iron substance by magnetic separation; It is characterized in that: the technical parameter of controlling in technique is:
In revolution kiln hood coal gas, the CO volumetric concentration meets CO/ (CO 2+ CO) 70% and the kiln hood gas temperature be 1150 ℃~1300 ℃; Water content when blast furnace contains zinc gray and enters stove is at 10~30wt%; Enter carbonaceous amount content in the charge composition of rotary kiln and be not less than 20%; In the slag iron mixture that the rotary kiln reduction obtains, the reduction ratio of iron is not less than 85wt% and the metallic iron particle size is not less than 0.1mm; Enter the mean particle size 0.08mm-0.2mm of the front slag iron mixture of magnetic separator; In metallic iron product after separation, all iron content is not less than 85wt%, and degree of metalization is not less than 85wt%;
When blast furnace contains carbon content in zinc gray lower than 20wt%, with addition of part coal dust or coke powder, more than guaranteeing in feed stock for blast furnace that carbonaceous amount content reaches 20wt%, the carbonaceous fuel of adding and blast furnace contain zinc gray to add in kiln from the kiln tail after mixing, or from kiln hood, sprays into the kiln internal combustion separately.
2. method according to claim 1, is characterized in that: hot metal iron and the cooling employing shrend of the slag mixture type of cooling that the rotary kiln reduction obtains; Or water coolant directly do not contact with furnace charge, but utilize the cylinder mode furnace charge heat to be passed to the indirect type of cooling of water coolant by the contact wall.
3. method according to claim 1, it is characterized in that: described slag iron mixture is milled down to 0.08mm-0.2mm by ball mill by the mean particle size of this slag iron mixture, or adds that by fragmentation the mode of ball milling is milled down to 0.08mm-0.2mm by the mean particle size of slag iron mixture.
4. method according to claim 1, is characterized in that: adopt wet magnetic separator that the slag iron mixture is separated into to metal iron powder and slag.
5. method according to claim 1 is characterized in that: magnetic separation is separated to the moisture metal iron powder drying obtained, water-content is less than 2wt%.
6. method according to claim 5, is characterized in that: dried metal iron powder is directly used, or use by being cold-pressed into sponge iron blocks or ball.
CN2012102586935A 2012-07-24 2012-07-24 Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash CN102766718B (en)

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CN101457269A (en) * 2008-12-30 2009-06-17 重庆高岭投资(集团)有限公司 Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust
CN101914685A (en) * 2010-08-19 2010-12-15 北京科技大学 Method for preparing metal iron and zinc/zinc oxide from electric furnace dust
CN102127645A (en) * 2011-02-18 2011-07-20 攀枝花钢城集团有限公司 Technological method for extracting zinc by roasting blast furnace gas mud by virtue of rotary kiln

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