CN1033648A - Iron scale in shaft furnace with the coke powder clean sponge iron of original production also - Google Patents
Iron scale in shaft furnace with the coke powder clean sponge iron of original production also Download PDFInfo
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- CN1033648A CN1033648A CN 87101175 CN87101175A CN1033648A CN 1033648 A CN1033648 A CN 1033648A CN 87101175 CN87101175 CN 87101175 CN 87101175 A CN87101175 A CN 87101175A CN 1033648 A CN1033648 A CN 1033648A
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- iron
- iron scale
- coke powder
- shaft furnace
- sponge iron
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Abstract
The present invention relates to a kind of reduction shaft furnace and new process that has improved that adopt, and with coke powder iron scale or other iron content powders is reduced into clean sponge iron, saves the agglomeration link.Sponge iron is drawn, is drawn by special device and dials, the densification moulding, cuts off and make finished product.
The present invention is not only applicable to the direct reduction of iron scale, is applicable to the reduction of other metallurgical dusts and fine iron breeze simultaneously yet, and used powder needn't agglomeration.The sponge iron of producing can use for ironmaking, steel-making, casting, powder metallurgy.
Description
The invention belongs to a kind of equipment and the method for directly going back original production iron in the ferrous metallurgy production.
Current equipment and method with the clean sponge iron of iron scale production mainly is crucible-tunnel furnace method (Hoganas method) and crucible-reflecting kiln method.More than two kinds of equipment and method be the ancient equipment and the technology of non-blast furnace reduced iron.They are raw materials used to be iron scale or high-purity refined iron-mineral powder, and charcoal or coke powder are made reductive agent.Furnace charge is contained in respectively in the same crucible, makes sponge iron in tunnel furnace or reflecting kiln internal heating, reduction, cooling.With these two kinds of method reduced irons, it is long to produce reduction cycle, generally more than 40 hours.Owing to adopt hand charging, discharging, operation site dust from flying, contaminate environment, labour intensity are big.
Produce sponge iron with ebullated bed reduction iron scale, because of reduction temperature is lower, product is inflammable, quality is wayward.In shaft furnace, produce sponge iron, because of reducing gas price height, cost is increased greatly with the gas reduction rich ore.Produce sponge iron with rotary kiln reducting pellet ore deposit, because of T
FeBe more than 98%, productivity is descended significantly, the rate of recovery of iron reduces, and increases to produce investment.
Purpose of the present invention is exactly in order to utilize iron content powdery furnace charge; save the agglomeration link; add an amount of lime masonry reductive agent with coke powder and carry out directly also original production sponge iron; in the hope of boosting productivity, reduce raw material consumption, raising and stabilized product quality, improve the environment protection condition, alleviate manual work, reduce floor space, saving investment, for direct reducing metal furnace charge has been opened up a new way.
To achieve these goals, the present invention adopts reduction shaft furnace shown in Figure 1, by processing method of the present invention, with coke powder iron scale or other iron content powders is directly reduced.Furnace charge through giving heat, reduction, the fixed sponge iron of making, separates with residue coke powder, lime, ash content through cooling, moulding, cut-out, magnetic separation in shaft furnace.
Reduction shaft furnace is made up of central part receiving hopper 1, central part tremie pipe 2, peripheral hopper 3, reaction tubes 4, shaft furnace body of heater 5, cooling jacket 6, revolving scraper 7, coke-unloading disk 8, springhole 9, pair roller 10, watertight chest 11, valve 12 and 13, thermopair 14 and 15, material chi 16.The reduction shaft furnace profile can be circle or other shapes.
Central part receiving hopper 1 and central part tremie pipe 2 can be made an integral body and also can separately do.The section of reaction tubes 4 requires to adopt arbitrary shape according to heat and mass.In a reduction shaft furnace, several reaction tubess 4 can be set according to the output needs.Pair roller 10 has tooth and cutting knife, so as with the sponge iron of drawing bite, drawing, densification moulding, cut-out, pair roller 10 is convenient to change to adapt to the change of sponge iron kind.Significant parameter in thermopair 14 and 15, the material chi 16 control reduction processes.Control thermopair depth of penetration.
Sponge iron is drawn chuck and is seen Fig. 2 for details.
Processing method of the present invention is: the softening performance of at first measuring iron scale or other iron content powders and coke powder ash content; Measure the dull temperature of reduction of iron scale or other iron content powders; Make the mensuration of furnace charge running orbit cold conditions.Then with iron scale or other iron content powders from central division receiving hopper 1 join central part tremie pipe 2, coke powder and an amount of Wingdale join reaction tubes 4 from peripheral hopper 3.Reaction tubes 4 is positioned in the shaft furnace body of heater 5, by burning coal gas or coal dust heat supply.Iron scale or other iron content powders meet with coke powder in the decline process, and crystallization, reduction, fixed take place under high temperature action.The carbon monoxide gas that coke powder and gasification thereof generate is made reductive agent, and coke powder prevents that also the bond tube wall of reaction tubes 4 of iron scale or other iron content powders from forming mobile isolated screen in reduction process simultaneously.Coke powder is by itself effectively heavily descending.Iron scale or other iron content powders and the sponge iron that restores are except that by the dead weight, and also the drawing by bottom pair roller 10 descends.The crystallization of iron scale or other iron content powders and sponge iron fixed guaranteed the transmission of pair roller 10 drawing reactive forces.Sponge iron passes the springhole 9 at coke-unloading disk 8 centers through the cooling jacket 6 of cooling section, through cleaning with water, drawing, densification moulding and cut off.Remaining coke powder, lime scrape coke-unloading disk 8 by revolving scraper 7.Coke-unloading disk 8 and springhole 9 self-lockings had both been kept coke powder and had not been dropped down, and guaranteed that again sponge iron passes smoothly.The material that unloads is discharged watertight chest 11 by valve 12 and 13, takes out sponge iron through magnetic separation.
Technical characterstic of the present invention is: reduction shaft furnace equipment novelty, automatic and mechanical degree height, reduced hand labor and environmental pollution.Adopt coke powder or coke powder to add an amount of Wingdale in the reducing process process iron scale or other iron content powders are directly reduced, save the agglomeration link, reduce investment and energy consumption.This equipment and reduction process guarantee that furnace charge descends smoothly, shorten reduction cycle, by shortening to more than 40 hours below 16 hours of past, to compare with crucible-reflecting kiln method with crucible-tunnel furnace method, the sponge iron per ton that reduces can make production cost reduce by 30～50%.The sponge iron T that the present invention produces
Fe＞98%.
Fig. 1 is the whole sectional front view of reduction shaft furnace.
Fig. 2 draws the chuck synoptic diagram for sponge iron.
Is that example further describes performance of the present invention below in conjunction with accompanying drawing with the reduction iron scale:
The condition of pressing Fig. 1 is with central part receiving hopper 1, central part tremie pipe 2, peripheral hopper 3, and reaction tubes 4, shaft furnace body of heater 5, cooling jacket 6, revolving scraper 7, coke-unloading disk 8, springhole 9, pair roller 10, watertight chest 11, valve 12 and 13, thermopair 14 and 15, material chi 16 are assembled into reduction shaft furnace.And design is made sponge iron and is drawn chuck.Pair roller 10 has tooth and cutting knife and is convenient to be changed.
At first measure the softening performance of iron scale and coke powder ash content before the blow-on; Measure the dull temperature of reduction of iron scale, determine correct reduction temperature; Make the mensuration of furnace charge running orbit cold conditions, determine that tremie pipe 2 exits are to the height H of material pipe between the coke-unloading disk 8 from central division.Then furnace charge is carried out magnetic separation and oven dry (regular burden(ing) can not dried).The granularity of iron scale and coke powder is less than 5 millimeters.
During blow-on, with iron scale from central division receiving hopper 1 join central part tremie pipe 2.The temperature in central part tremie pipe 2 exits is controlled at the temperature range than low 300 ℃ of iron scale sticking temperature, guarantees that the non-caked central part tremie pipe of iron scale tube wall causes to get stuck.The thermograde of control iron scale after central part tremie pipe 2 outlet is greater than 40 ℃/centimetre scope.Furnace charge is in reduction process, and for preventing the tube wall of iron scale bonding reaction tubes 4, iron scale is peripheral isolates with the coke powder moving-bed.For preventing two kinds of powdery furnace charge blending in the decline process, the furnace charge rate of descent must must not be controlled at greater than 10 millimeters/minute scope, and the rate of descent of coke powder should be a little more than the rate of descent of iron scale.Should guarantee certain altitude between 2 outlets of central part tremie pipe and the coke-unloading disk 8, the height and the reaction tubes 4 hydro science radius ratios of mould examination equipment of the present invention are 10.Sponge iron is drawn chuck sponge iron is directed on the pair roller after (pair roller of nipping), enters normal operation.During blowing out, the coke powder charge level should be higher than the iron scale charge level, guarantees smooth discharging, blowing out.
Reduction shaft furnace has also adopted special dumping device, and dumping device is installed in the watertight chest 11.The casing of watertight chest 11 is provided with explosionproof hole and accident treatment hole, also be provided with two valves 12 and 13 alternately breakdown emit furnace charge.
The present invention also takes following measure for improving reduction rate: allocate an amount of charcoal and iron powder (can utilize and return iron powder) in iron scale into, control reducing gas deposit carbon in iron scale avoids reducing dull humidity province, selects suitable reduction temperature for use; Adopt the operation of coke powder moving-bed, help the renewal of C-FeO reaction surface, quicken reduction reaction; By logical nitrogen of special device and the suitable quantity of water steam that cooling jacket 6 is provided with, strengthen cooling, improve the reduction kinetics condition of divergence, prevent that CO (carbon monoxide converter) gas from flowing backwards, and reduces the carbon content in the product; Allocate an amount of Wingdale in the coke powder into, carry out desulfurization and improve the reactivity of coke powder, quicken reduction reaction.
The present invention not only is suitable for the reduction of iron scale, also is applicable to the reduction of metallurgical dust and fine iron breeze. The sponge iron of producing can use for ironmaking, steel-making, casting and powder metallurgy.
Claims (8)
1, a kind of iron scale with the coke powder processing method of the clean sponge iron of original production also, is characterized in that: adopt powdery furnace charge iron scale and coke powder in shaft furnace.The coke powder moving-bed is made reductive agent, and is the isolated screen of 4 of iron scale stock column and reaction tubess.Iron scale is reduced in the decline process, fixed, be cooled to sponge iron.Not blending in two kinds of furnace charge decline processes.The sponge iron of producing is discharged out of the furnace by special dumping device.
2, iron scale being carried out the reductive shaft furnace is made up of central part receiving hopper, central part tremie pipe, peripheral hopper, reaction tubes, shaft furnace body of heater, cooling jacket, revolving scraper, coke-unloading disk, springhole, pair roller, watertight chest, valve, thermopair, material chi, it is characterized in that: central part receiving hopper 1 and central part tremie pipe 2 can be made an integral body, also can separately do.Reaction tubes 4 can be provided with 1 or several in same shaft furnace, its section can adopt arbitrary shape.Pair roller 10 has tooth and cutting knife.Coke-unloading disk 8 is provided with springhole 9.Be provided with special dumping device in the watertight chest 11.
3, iron scale according to claim 1 with the coke powder clean sponge iron of original production also, it is characterized in that iron scale without agglomeration, and available other iron content powders replaces in shaft furnace.
4, iron scale according to claim 1 with the coke powder clean sponge iron of original production also, is characterized in that allocating in the iron scale an amount of charcoal and iron powder in shaft furnace.
5, iron scale according to claim 1 with the coke powder clean sponge iron of original production also, is characterized in that adding in the coke powder an amount of Wingdale in shaft furnace.
6, iron scale according to claim 1 with the coke powder clean sponge iron of original production also, is characterized in that in shaft furnace: the rate of descent of iron scale and coke powder＞10 millimeter/minute, the rate of descent of coke powder is slightly larger than the rate of descent of iron scale.Iron scale is lower 300 ℃ than iron scale sticking temperature in the temperature of central part tremie pipe 2 outlets.Iron scale leaves thermograde＞40 ℃/centimetre after central part tremie pipe 2 outlet.
7, iron scale according to claim 1 generates clean sponge iron with the coke powder reduction in shaft furnace, it is characterized in that: feed nitrogen and water vapor by cooling jacket 6 to the cooling zone.
8, iron scale according to claim 1 with the coke powder clean sponge iron of original production also, adopts special sponge iron to draw chuck in shaft furnace when it is characterized in that blow-on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101175 CN1033648A (en) | 1987-12-22 | 1987-12-22 | Iron scale in shaft furnace with the coke powder clean sponge iron of original production also |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101175 CN1033648A (en) | 1987-12-22 | 1987-12-22 | Iron scale in shaft furnace with the coke powder clean sponge iron of original production also |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1033648A true CN1033648A (en) | 1989-07-05 |
Family
ID=4813231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87101175 Pending CN1033648A (en) | 1987-12-22 | 1987-12-22 | Iron scale in shaft furnace with the coke powder clean sponge iron of original production also |
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| CN (1) | CN1033648A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312297C (en) * | 2004-12-10 | 2007-04-25 | 李增元 | Nickel-containing sponge iron, and its preparing method and method for producing nickel alloy billet |
| CN100424190C (en) * | 2005-08-19 | 2008-10-08 | 张和起 | Sponge iron for furnace charge and its manufacturing method |
| CN101358258B (en) * | 2007-08-02 | 2010-06-30 | 北京神雾热能技术有限公司 | Coal reducing gas direct reduction metallurgical process in gas-based shaft kiln and system |
| CN101538631B (en) * | 2009-02-05 | 2010-12-08 | 丁家伟 | Process and device for smelting ferronickel and nickel-containing molten iron by using lower-nickel materials |
| CN109663924A (en) * | 2017-10-14 | 2019-04-23 | 朝阳市金麟铁精粉有限公司 | Reduced iron powder barrel-clamping device |
-
1987
- 1987-12-22 CN CN 87101175 patent/CN1033648A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312297C (en) * | 2004-12-10 | 2007-04-25 | 李增元 | Nickel-containing sponge iron, and its preparing method and method for producing nickel alloy billet |
| CN100424190C (en) * | 2005-08-19 | 2008-10-08 | 张和起 | Sponge iron for furnace charge and its manufacturing method |
| CN101358258B (en) * | 2007-08-02 | 2010-06-30 | 北京神雾热能技术有限公司 | Coal reducing gas direct reduction metallurgical process in gas-based shaft kiln and system |
| CN101538631B (en) * | 2009-02-05 | 2010-12-08 | 丁家伟 | Process and device for smelting ferronickel and nickel-containing molten iron by using lower-nickel materials |
| CN109663924A (en) * | 2017-10-14 | 2019-04-23 | 朝阳市金麟铁精粉有限公司 | Reduced iron powder barrel-clamping device |
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