CN102559977A - Novel production method of granular iron - Google Patents
Novel production method of granular iron Download PDFInfo
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- CN102559977A CN102559977A CN2012100265681A CN201210026568A CN102559977A CN 102559977 A CN102559977 A CN 102559977A CN 2012100265681 A CN2012100265681 A CN 2012100265681A CN 201210026568 A CN201210026568 A CN 201210026568A CN 102559977 A CN102559977 A CN 102559977A
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Abstract
The invention discloses a novel production method of granular iron. The method comprises a material blending step, a block preparing step, a reduction step, and a separation step. In the material blending step, raw materials required by granular iron production are selected, and are blended according to a preset ratio. The raw materials comprise components of iron ore powder, coal fines, lime stone powder, dolomite powder, and an agglomerant. The ratios of the components of the raw materials are determined by principles that: a molar ratio of fixed carbon contained in the coal fines to oxygen contained in the iron ore powder is 0.8-1.5, a molar ratio of CaO contained in the lime stone powder and the dolomite powder to SiO2 contained in the raw materials satisfy a slag binary basicity of 0.8-1.4, a weight ratio of the lime stone powder to the dolomite powder is 1.5-4, and the agglomerant takes 1-5% of the total weight of the raw materials. In the block preparing step, the blended materials are uniformly mixed with water, and a series of small-volume agglomerates are prepared. In the reduction step, the small-volume agglomerates are placed in an annular furnace, and are subject to smelting reduction, such that granular iron and slag are formed. According to the invention, the raw material formula is scientific and reasonable. With the formula, granular iron with high iron content and low impurity content can be obtained.
Description
Technical field
The present invention relates to field of metallurgy, particularly relate to not only without coke but also without the granulated iron new process for producing of oxygen or Sweet natural gas.
Background technology
The present age, the method for ironmaking mainly was a blast furnace process; It has very high productivity and lower energy consumption, but it must use coke, and coke is that blast furnace process provides heat energy, reductive agent; And keep the ventilation property of stock column in the stove, these three kinds of effects are that other fuel can not possess.Yet can supply the coking coal of coking deficient day by day, demand seeking a kind of new iron smelting method urgently.
Steel scrap is one of main raw material of modern steel-making usefulness, and steel scrap is in short supply at present.In addition, owing to steel scrap is used as steelmaking feed repeatedly, the wherein contained element that is difficult for oxidation, increasingly high like the content of Mo, Ni and other harmful elements, thus limited re-using of steel scrap.Dri (DRI) can be used for replacing steel scrap to make steelmaking feed.The sponge iron of the whole world more than 90% done reductive agent production with Sweet natural gas at present.The resource-constrained of China's natural gas and selling at exorbitant prices have limited the development of sponge iron.Therefore the eager demand of metallurgical industry can replace the product of steel scrap and sponge iron.
Chinese patent Granted publication CN 1219078C discloses a kind of coal base hot-air rotary hearth furnace melting reduction iron-smelting method and has produced pearl iron, owing to this method can be separated metallic iron in a step with slag, thereby can use the iron ore of general grade.Pearl iron is as a kind of steel-making new raw material, and it is superior to steel scrap and sponge iron on chemical ingredients and performance.Because it does not contain harmful element and impurity that common steel scrap contains, like Zn, Pb, Cu etc.; And, be convenient to storing and charging because pearl iron is shaped as regular bead.
Yet this Chinese patent CN 1219078C remains in some defectives.For example; Aspect proportioning raw materials; This patent only limits raw material with weight part simply to be formed, and does not consider the influence that the actual grade of choosing raw material is formed raw material, includes but not limited to the ferriferous oxide content in the actual iron ore of choosing, the carbon content in the coal dust or the like.And the temperature range of each process section is more wide in range in the rotary hearth furnace, and the span of some temperature range is very unreasonable yet.
Summary of the invention
The objective of the invention is to solve at least one defective of the prior art, improve ironmaking technique of fusion and reduction.Another object of the present invention provides a kind of new granulated iron working method.
The present invention realizes through following scheme:
The granulated iron new process for producing comprises:
Batching step: selection is produced the required raw material of granulated iron and is prepared burden according to predetermined ratio, and said raw material comprises powdered iron ore, coal dust, limestone powder, ground dolomite and sticker; The ratio of each component is confirmed according to following principle in the said raw material, that is: contained fixed carbon of coal dust and the oxygen containing molar ratio of powdered iron ore are 0.8～1.5, are preferably 1.0～1.2, more preferably 1.0～1.1; Contained SiO in contained CaO and the raw material in limestone powder and the ground dolomite
2Molar ratio satisfy slag dual alkalinity 0.8～1.4, be preferably 1.0～1.2; The weight ratio of limestone powder and ground dolomite is 1.5～4, is preferably 2～3; Sticker accounts for 1～5% of raw material gross weight, is preferably 2～4%;
Agglomeration step: the raw material for preparing is added the water mixing, process a series of small volume agglomerates;
Reduction step: place ring furnace to carry out melting and reducing said small volume agglomerate, form granulated iron and slag;
Separating step: the granulated iron that will in said reduction step, form separates with slag, to obtain required granulated iron.
In the method for the invention; Said ring furnace preferably includes first area, second area, the 3rd zone and the 4th zone with differing temps; Said small volume agglomerate order in ring furnace and correspondingly experiences preheating, reduction, fusion, solidifies four-stage through said first to fourth zone.In this case, can the temperature of the first area of said ring furnace be set between 1100～1200 ℃, preferably between 1120～1180 ℃, more preferably between 1140～1160 ℃.Said small volume agglomerate experiences pre-heating stage in the first area of said ring furnace time can be 3～5 minutes.Can set the temperature of said second area for be higher than said first area temperature, the temperature of said second area is set between 1200～1350 ℃, preferably between 1230～1320 ℃, more preferably between 1260～1290 ℃.Said small volume agglomerate experiences reduction phase in the second area of said ring furnace time can be 5～25 minutes.Can set the temperature in said the 3rd zone for be higher than said second area temperature, the temperature in said the 3rd zone is set between 1350～1500 ℃, preferably between 1370～1460 ℃, more preferably between 1390～1420 ℃.Said small volume agglomerate experiences melt stage in the 3rd zone of said ring furnace time can be 3～10 minutes.Can set said four-range temperature for be lower than said first area temperature, said four-range temperature is set between 1000～1100 ℃, preferably between 1020～1080 ℃, more preferably between 1040～1060 ℃.Said small volume agglomerate experiences solidification stages in the 4th zone of said ring furnace time can be 4～10 minutes.
In one embodiment, in said agglomeration step, said small volume agglomerate is the briquetting that compression moulding forms, and the mean particle size of said briquetting is 20～40mm.In this case, the granularity of said powdered iron ore, coal dust, limestone powder, ground dolomite is preferably and is less than or equal to 3mm.
In one embodiment, in said agglomeration step, said small volume agglomerate is the green-ball that rolling balling forms, and the diameter of said green-ball is 10～20mm.In this case, the granularity of said powdered iron ore, coal dust, limestone powder, ground dolomite is preferably and is less than or equal to 0.074mm.
In one embodiment, between said agglomeration step and reduction step, also comprise drying step, be used for the said small volume agglomerate that forms in said agglomeration step is carried out drying with dryer.
Granulated iron new process for producing of the present invention has following beneficial effect at least:
(1) can use the iron ore of general grade, widen the scope of application of iron ore, thereby alleviate urgency to a certain extent, reduce the cost of iron ore the high grade ore demand.
(2) replace coking coal in short supply relatively with the more abundant mill coal of resource, need not coking, reduced production process, reduced the problem of environmental pollution that coking industry brings; Also greatly reduce simultaneously cost.
(3) its product replaces steel scrap to have pure (harmful elements such as Cu, Zn, Pb are few), the energy-conservation power consumption advantages such as (the product carbon containing can provide the part heat) of falling as steelmaking feed.
(4) proportioning raw materials and thermal regulation help obtaining the iron level height and the few granulated iron of foreign matter content among the present invention.
Description of drawings
Fig. 1 is the process flow sheet of the granulated iron new process for producing of one embodiment of the present of invention.
Embodiment
Below in conjunction with accompanying drawing, describe the present invention in detail.
Fig. 1 is the process flow sheet of the granulated iron new process for producing of one embodiment of the present of invention.Feed bin 1 is used to load produces the required various feed composition of granulated iron, and it comprises iron ore powder storehouse, Pulverized Coal Bin, flux storehouse, sticker storehouse.Confected materials gets into mixer 2 through feed bin 1 in proportion, herein raw material is added water, mixes, and sends into the small volume agglomerate that ball press 3 is processed a series of briquetting forms then.In other embodiments, the raw material in the mixer 2 also can be sent in other molding device, as sends into and carry out rolling balling in the balling disk (-sc), thereby forms the small volume agglomerate of a series of green-ball forms.These small volume agglomerates are sent into dryer 4 carry out drying, certainly, in other embodiments, also can omit this drying step.Then, these small volume agglomerates are admitted to ring furnace 6 through distributor 5.Distributing mode can be vibrating feed or scraper plate feed, and the small volume agglomerate is evenly distributed on the furnace bottom.The furnace bottom of ring furnace 6 can rotate continuously, for example can be rotary hearth furnace.Ring furnace 6 can have four different temperature zones, and temperature can progressively rise to 1200～1350 ℃ in the stove from 1100～1200 ℃ of its opening for feed, rises to 1350～1500 ℃ again, is reduced to 1100～1000 ℃ afterwards gradually.The small volume agglomerate in ring furnace order through above-mentioned four zones, correspondingly through preheating, reduction, fusion, obtain solid-state granulated iron and slag after solidifying; Discharge out of the furnace through discharge port then.The used ring furnace furnace bottom of the present invention used time that rotates a circle is 15～50 minutes, and because of raw material properties is different, can there be the long weak point that has the time.The granulated iron and the slag of discharging ring furnace 6 directly get into the 7 cooling fragmentations of cooling crusher, separate granulated iron 9 and slag 10 with magnetic separator 8 then.
Spent air temp very high (1100～1300 ℃) from the ring furnace discharge; Can reclaim the heat energy that waste gas carries with air heat exchanger 11 and gas change heater 12; The air and the coal gas that have improved temperature simultaneously get into the ring furnace internal combustion through burner 14 under the effect of gas blower 13; Another part warm air gets in the stoves through nozzle 15, for the fugitive constituent of coal dust combustion-supporting with the CO of ferriferous oxide reduction generation.So both reclaim the heat energy of waste gas, guaranteed the temperature that ring furnace needs again.Spent air temp through dryer drops to 80～150 ℃, has not had the value of utilization, discharges from chimney 18 through fly-ash separator 16 induced draft fans 17.
Below in conjunction with specific embodiment, set forth method of the present invention.
Batching step
Selection is produced the required raw material of granulated iron and is prepared burden according to predetermined ratio, and raw material comprises powdered iron ore, coal dust, limestone powder, ground dolomite and sticker; The ratio of each component is confirmed according to following principle in the raw material: coal dust contains fixed carbon and the oxygen containing molar ratio of powdered iron ore is 0.8～1.5, is preferably 1.0～1.2, and more preferably 1.0～1.1; Contained SiO in contained CaO and the raw material in limestone powder and the ground dolomite
2Molar ratio satisfy slag dual alkalinity 0.8～1.4, be preferably 1.0～1.2; The weight ratio of limestone powder and ground dolomite is 1.5～4, is preferably 2～3; Sticker accounts for 1～5% of raw material gross weight, is preferably 2～4%.
Grade to Fe in the powdered iron ore does not have particular requirement, can be iron ore concentrate for the iron ore of general grade yet.In the method for the invention, reduction back granulated iron can separate with slag, and can carry out desulfurization, so less demanding to as the coal dust of reductive agent can be various coals.
In proportion of raw materials, coal dust contains fixed carbon and the oxygen containing molar ratio of powdered iron ore, promptly joins carbon ratio (C/O) and divides (being the fusion sepn process) influence significantly to molten.Joining carbon ratio increases, and pelletizing can form granulated iron more quickly.Reason is to join carbon ratio to improve, and then the rate of reduction of pelletizing is accelerated, and the carburizing cycle of metallic iron, the carburizing amount increased in advance, makes the temperature of fusion of metallic iron reduce, and the time that therefore forms granulated iron shortens; It is low to join carbon ratio, and then because carbon almost is consumed in the reduction, and therefore, excess carbon is few, and carburizing speed and carburizing amount all reduce, the temperature of fusion of iron is high, forms the time lengthening of granulated iron.But mixed carbon comtent is too high then can be owing to the carbon granule of surplus be too many, and slag viscosity increases, and hinders the gathering of iron and slag, makes pelletizing be dispersed into several littler granulated iron at last, but not whole granulated iron has been wasted resource simultaneously again.In the present invention, coal dust contains fixed carbon and the oxygen containing molar ratio of powdered iron ore between 0.8～1.5, preferably between 1.0～1.2, more preferably between 1.0～1.1.Experiment showed, according to what method of the present invention was selected and join carbon ratio, can improve reduction rate and improve the finished product granulated iron granularity this all obtain gratifying effect on aspect two.In the actual process process, according to the powdered iron ore of concrete selection and the kind of coal dust, and according to instruction of the present invention, those skilled in the art can confirm the concrete proportioning and the consumption of powdered iron ore and coal dust at an easy rate.
Limestone powder and ground dolomite are used as flux in the granulated iron production process, carry out smoothly so that in the granulated iron production process, make the fusion of slag iron separate.And limestone powder and ground dolomite also are used for sloughing sulphur entrained in powdered iron ore and the coal dust (S) composition in the granulated iron production process, to reduce the sulphur content in the finished product granulated iron.Working the slag dual alkalinity (CaO/SiO
2) S content is highly effective in the granulated iron to reducing.The present inventor finds that within the specific limits, the sulphur content in the granulated iron can reduce along with the rising of basicity, and when basicity further increases, then little to the influence of the sulphur content in the granulated iron.And basicity has remarkably influenced to molten minute process in the granulated iron production, and too high or too low basicity all possibly worsen the separation of slag iron.In the method for the invention, contained SiO in contained CaO and the raw material in limestone powder and the ground dolomite
2Molar ratio satisfy slag dual alkalinity 0.8～1.4, be preferably 1.0～1.2, for example may be selected to be 1.05,1.1 or 1.15.Experiment showed, the slag dual alkalinity of selecting according to method of the present invention, can reduce the granulated iron sulphur content and optimize slag iron and separate this and all obtain gratifying effect on aspect two.
Ground dolomite in the raw material generates CaO and MgO when high temperature, CaO is used in slag, consolidating S, and S content reduces in the granulated iron thereby make; Proper addition of MgO helps separating of granulated iron and slag.In the present invention, the weight ratio of limestone powder and ground dolomite is 1.5～4, is preferably 2～3, for example is 2.3,2.5 or 2.9.In the actual process process, according to the kind of concrete selection powdered iron ore, coal dust, limestone powder and ground dolomite, and according to instruction of the present invention, those skilled in the art can confirm the concrete proportioning and the consumption of limestone powder and ground dolomite at an easy rate respectively.
Sticker in the raw material can be organic binder bond and/or mineral binder bond.Organic binder bond for example can be the syrup waste liquid; Mineral binder bond for example can be wilkinite.Sticker can account for 1～5% of raw material gross weight, is preferably 2～4%.
More specifically among the embodiment, each proportion of raw materials can be selected according to the instance that provides in the table 1 in the batching step at some.What wherein, C/O represented is contained fixed carbon of coal dust and the oxygen containing molar ratio of powdered iron ore; CaO/SiO
2Expression be contained SiO in contained CaO and the raw material in limestone powder and the ground dolomite
2Molar ratio, i.e. slag dual alkalinity; What Wingdale/rhombspar was represented is the weight ratio of limestone powder and ground dolomite; What sticker was represented is the per-cent that sticker accounts for the raw material gross weight.
Each proportioning raw materials among the different embodiment of table 1
| C/O | CaO/SiO 2 | Wingdale/ | Sticker | |
| Instance | ||||
| 1 | 0.8 | 0.8 | 2.9 | 1 |
| Instance 2 | 0.9 | 1.4 | 1.5 | 3.0 |
| |
1.0 | 1.2 | 3.0 | 2.5 |
| Instance 4 | 1.1 | 1.1 | 2.0 | 5.0 |
| |
1.15 | 1.05 | 2.3 | 3.0 |
| Instance 6 | 1.2 | 1.0 | 4.0 | 4 |
| |
1.4 | 0.9 | 2.5 | 3.5 |
| |
1.2 | 1.15 | 3.5 | 5.0 |
| Instance 9 | 1.5 | 1.3 | 2.3 | 2 |
The agglomeration step
The raw material for preparing is added the water mixing, process a series of small volume agglomerates.
If raw material is processed briquetting, the granularity of powdered iron ore, coal dust, limestone powder, ground dolomite may be selected in and is less than or equal to 3mm in the raw material, is preferably less than 2mm; The mean particle size of processing briquetting is 20～40mm, is preferably 25mm～35mm.
If raw material is processed green-ball, the granularity of powdered iron ore, coal dust, limestone powder, ground dolomite is preferably less than or equals 0.074mm in the raw material; The diameter of processing green-ball is 10～20mm, is preferably 15mm.
Reduction step
The small volume agglomerate for preparing can be admitted to ring furnace again through drying earlier and reduce, and also can directly send into ring furnace without drying.Intensity without exsiccant small volume agglomerate is poor slightly, but owing to reduced operation, is suitable for the not high occasion of small volume agglomerate requirement of strength.
The ring furnace of small volume agglomerate of being used to reduce can be a rotary kiln, can be rotary hearth furnace also, comprises first area, second area, the 3rd zone and the 4th zone with differing temps.Small volume agglomerate order in ring furnace and correspondingly experiences preheating, reduction, fusion, solidifies four-stage through first to fourth zone.The temperature of the first area of ring furnace is set between 1100～1200 ℃, preferably between 1120～1180 ℃, more preferably between 1140～1160 ℃; The temperature of second area is set between 1200～1350 ℃, preferably between 1230～1320 ℃, more preferably between 1260～1290 ℃; The temperature in the 3rd zone is set between 1350～1500 ℃, preferably between 1370～1460 ℃, more preferably between 1390～1420 ℃; The four-range temperature is set between 1000～1100 ℃, preferably between 1020～1080 ℃, more preferably between 1040～1060 ℃.
Along with the rotation of ring furnace, the small volume agglomerate is sloughed wherein moisture, fugitive constituent the first area of ring furnace preheating 3～5 minutes; Limestone powder and ground dolomite decompose, and the ferriferous oxide of high price begins by the carbon reduction in the coal dust.The small volume agglomerate of preheating lasts 5～25 minutes along with the second area of the rotation entering ring furnace of furnace bottom.Ferriferous oxide in the iron ore progressively is reduced to metallic iron, CaO in the raw material and MgO and SiO
2Begin reaction.
Along with the rotation of ring furnace, the small volume agglomerate behind solid phase reduction gets into the 3rd zone of ring furnace, lasts 3～10 minutes.At this moment, the metallic iron carburizing, fusing point reduces and becomes liquid state, and unreduced ferriferous oxide carries out liquid-phase reduction.Owing to capillary effect, liquid iron becomes sphere simultaneously, and slag also melts into liquid phase, carries out slag making and desulfurization.
Along with the rotation of ring furnace, cooled and solidified is carried out in the 4th zone of fused granulated iron and slag entering ring furnace in ring furnace the 3rd zone, and the time is 4～10 minutes, obtains isolating basically solid-state granulated iron and slag particle.
At some more specifically among the embodiment, in the reduction step in the ring furnace temperature setting in four zones can select according to the instance that provides in the table 2.The proportioning raw materials of each embodiment can be employed in as described in the aforementioned batching step in the table 2, for example the proportioning raw materials of table 1.
The temperature setting of ring furnace among the different embodiment of table 2 (unit: ℃)
| |
Instance 2 | |
Instance 4 | |
Instance 6 | |
|
| The first area | 1100 | 1120 | 1140 | 1150 | 1160 | 1180 | 1200 |
| Second area | 1200 | 1350 | 1230 | 1320 | 1260 | 1290 | 1280 |
| The 3rd zone | 1400 | 1350 | 1460 | 1390 | 1500 | 1370 | 1420 |
| The 4th zone | 1020 | 1000 | 1040 | 1100 | 1060 | 1050 | 1080 |
Separating step
Isolating basically slag and granulated iron are released outside the stove by discharging machine, after cooling, fragmentation and magnetic separation, separate and select granulated iron.
By the preferred embodiments of the present invention method can production iron content＞94%, carbon containing 2～4%, sulphur＜0.07%, silicon＜0.3%, granularity can supply steel-making and casting to use greater than the granulated iron of 5mm.
It will be appreciated by those skilled in the art that the foregoing description only is used for explaining and explanation the present invention, is not to be used for it is carried out any restriction.Temperature distribution in proportioning raw materials of the present invention and the ring furnace can be carried out arbitrarily reasonably combination.
Claims (15)
1. granulated iron new process for producing comprises:
Batching step: selection is produced the required raw material of granulated iron and is prepared burden according to predetermined ratio, and said raw material comprises powdered iron ore, coal dust, limestone powder, ground dolomite and sticker; The ratio of each component is confirmed according to following principle in the said raw material, that is: contained fixed carbon of coal dust and the oxygen containing molar ratio of powdered iron ore are 0.8～1.5, are preferably 1.0～1.2, more preferably 1.0～1.1; Contained SiO in contained CaO and the raw material in limestone powder and the ground dolomite
2Molar ratio satisfy slag dual alkalinity 0.8～1.4, be preferably 1.0～1.2; The weight ratio of limestone powder and ground dolomite is 1.5～4, is preferably 2～3; Sticker accounts for 1～5% of raw material gross weight, is preferably 2～4%;
Agglomeration step: the raw material for preparing is added the water mixing, process a series of small volume agglomerates;
Reduction step: place ring furnace to carry out melting and reducing said small volume agglomerate, form granulated iron and slag;
Separating step: the granulated iron that will in said reduction step, form separates with slag, to obtain required granulated iron.
2. granulated iron new process for producing as claimed in claim 1; It is characterized in that; Said ring furnace comprises first area, second area, the 3rd zone and the 4th zone with differing temps; Said small volume agglomerate order in ring furnace and correspondingly experiences preheating, reduction, fusion, solidifies four-stage through said first to fourth zone.
3. granulated iron new process for producing as claimed in claim 2 is characterized in that, the temperature of the first area of said ring furnace is set between 1100～1200 ℃, preferably between 1120～1180 ℃, more preferably between 1140～1160 ℃.
4. like claim 2 or 3 described granulated iron new process for producing, it is characterized in that said small volume agglomerate experiences pre-heating stage in the first area of said ring furnace time is 3～5 minutes.
5. like each described granulated iron new process for producing in the claim 2～4; It is characterized in that; The temperature of said second area is set for the temperature that is higher than said first area; The temperature of said second area is set between 1200～1350 ℃, preferably between 1230～1320 ℃, more preferably between 1260～1290 ℃.
6. like each described granulated iron new process for producing in the claim 2～5, it is characterized in that said small volume agglomerate experiences reduction phase in the second area of said ring furnace time is 5～25 minutes.
7. like each described granulated iron new process for producing in the claim 2～6; It is characterized in that; Set the temperature in said the 3rd zone for be higher than said second area temperature; The temperature in said the 3rd zone is set between 1350～1500 ℃, preferably between 1370～1460 ℃, more preferably between 1390～1420 ℃.
8. like each described granulated iron new process for producing in the claim 2～7, it is characterized in that said small volume agglomerate experiences melt stage in the 3rd zone of said ring furnace time is 3～10 minutes.
9. like each described granulated iron new process for producing in the claim 2～8; It is characterized in that; Set said four-range temperature for be lower than said first area temperature; Said four-range temperature is set between 1000～1100 ℃, preferably between 1020～1080 ℃, more preferably between 1040～1060 ℃.
10. like each described granulated iron new process for producing in the claim 2～9, it is characterized in that said small volume agglomerate experiences solidification stages in the 4th zone of said ring furnace time is 4～10 minutes.
11. granulated iron new process for producing as claimed in claim 1 is characterized in that, in said agglomeration step, said small volume agglomerate is the briquetting that compression moulding forms, and the mean particle size of said briquetting is 20～40mm.
12. granulated iron new process for producing as claimed in claim 11 is characterized in that the granularity of said powdered iron ore, coal dust, limestone powder, ground dolomite is less than or equal to 3mm.
13. granulated iron new process for producing as claimed in claim 1 is characterized in that, in said agglomeration step, said small volume agglomerate is the green-ball that rolling balling forms, and the diameter of said green-ball is 10～20mm.
14. granulated iron new process for producing as claimed in claim 13 is characterized in that the granularity of said powdered iron ore, coal dust, limestone powder, ground dolomite is less than or equal to 0.074mm.
15. granulated iron new process for producing as claimed in claim 1 is characterized in that, between said agglomeration step and reduction step, also comprises drying step, is used for the said small volume agglomerate that forms in said agglomeration step is carried out drying with dryer.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105074015A (en) * | 2013-02-28 | 2015-11-18 | 株式会社神户制钢所 | Method for producing reduced iron agglomerate |
| TWI568855B (en) * | 2016-04-21 | 2017-02-01 | 中國鋼鐵股份有限公司 | Compounded slag controlling method of producing carbothermic reaction of iron at tall pellets bed |
| CN106414778A (en) * | 2014-05-15 | 2017-02-15 | 株式会社神户制钢所 | Production method of granular metallic iron |
| CN114107779A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Manufacturing method of ultrathin hot-rolled wide strip steel |
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| CN105074015A (en) * | 2013-02-28 | 2015-11-18 | 株式会社神户制钢所 | Method for producing reduced iron agglomerate |
| CN105074015B (en) * | 2013-02-28 | 2018-07-27 | 株式会社神户制钢所 | The manufacturing method of reduced iron agglomerate |
| CN106414778A (en) * | 2014-05-15 | 2017-02-15 | 株式会社神户制钢所 | Production method of granular metallic iron |
| US10407744B2 (en) | 2014-05-15 | 2019-09-10 | Kobe Steel, Ltd. | Production method of granular metallic iron |
| TWI568855B (en) * | 2016-04-21 | 2017-02-01 | 中國鋼鐵股份有限公司 | Compounded slag controlling method of producing carbothermic reaction of iron at tall pellets bed |
| CN114107779A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Manufacturing method of ultrathin hot-rolled wide strip steel |
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