CN1757766A - Steel-making solidify and manufacturing method and device - Google Patents

Steel-making solidify and manufacturing method and device Download PDF

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Publication number
CN1757766A
CN1757766A CN 200510107973 CN200510107973A CN1757766A CN 1757766 A CN1757766 A CN 1757766A CN 200510107973 CN200510107973 CN 200510107973 CN 200510107973 A CN200510107973 A CN 200510107973A CN 1757766 A CN1757766 A CN 1757766A
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steel
dust
cured article
making
making dust
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CN100463982C (en
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村松胜利
中岛淑岳
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NTN Corp
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NTN Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/32—Presses specially adapted for particular purposes for consolidating scrap metal or for compacting used cars
    • B30B9/327—Presses specially adapted for particular purposes for consolidating scrap metal or for compacting used cars for briquetting scrap metal

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  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

To provide a solidified material of steelmaking dust for the purpose of recycling it, which does not contain an excess additive such as a binder, has superior handleability, and is inexpensively manufactured by solidifying steelmaking dust produced in a steel production process with the use of a melting furnace; a manufacturing method therefor; and a manufacturing apparatus therefor. The solidified material B of steelmaking dust is formed by charging the dust 11 mainly containing iron and its oxide produced in the steel production process into a forming die 7, and compacting it. A compacting pressure (MPa) with respect to the cross section area x (mm<SP>2</SP>) is in a range of the expression: 5<=P<=-96.785ln(x)+958.97.

Description

Steel-making dust cured article and manufacture method thereof and manufacturing installation
Technical field
The invention relates to and to produce the dust that produces in the process of iron and steel with smelting furnace and utilize steel-making dust cured article and manufacture method and manufacturing installation again as steelmaking feed.
Background technology
In the process of producing iron and steel, for example in smelting furnace, the iron of the finely particulate that is blowed and ferric oxide form dust, are reclaimed in particle collector.The main component of this dust (hereinafter referred to as " steel-making dust ") is iron and ferric oxide, therefore, wishes it is reclaimed utilization again.But steel-making dust is small powder, if directly drop in the smelting furnace, inevitable dispersing everywhere upwards waved, and major part is wherein reclaimed by particle collector once more, and the efficient of Li Yonging is very low again.Therefore, be with its landfill disposal mostly, but the domestic annual steel-making dust that produces reach more than the few hundred thousand tonnes of, if landfill disposal is to consider it all is worthless from the resources effective utilization or from the angle of landfill deficiency and environmental degradation in the past.
Therefore, the people that utilize again for steel-making dust have attempted various methods.For instance, thus a kind of dust granules for preparing diameter 2-15mm is disclosed in the patent documentation 1, will make ferric oxide be recycled to method in the molten iron in its electric furnace of packing into; In patent documentation 2, disclose and a kind ofly added thermoplastics so that steel-making dust is configured as the method for briquetting; In patent documentation 3, disclose and a kind ofly added auxiliary curing agent so that grinding metal fragment and steel-making dust are configured as the method for briquetting.
[patent documentation 1] spy opens flat 11-152511 communique
[patent documentation 2] spy opens flat 09-316512 communique
[patent documentation 3] spy opens the 2002-194449 communique
Summary of the invention
The preparation particulate method of patent documentation 1 is compared with reclaiming powder, though pack into the operation ratio of electric furnace of granular composition is easier to, because the particulate size is smaller, thereby the efficient of the electric furnace of packing into is a problem.
The method of the adding additive of patent documentation 2 and patent documentation 3, all very effective for making firm briquetting, but owing to added the additive of plastics and tackiness agent, thereby have complex technical process, the shortcoming that production cost is high.In addition, additive has also caused environmental pressure, thereby inadvisable.
The purpose of this invention is to provide steel-making dust cured article and manufacture method thereof and manufacturing installation, described steel-making dust cured article is with the steel-making dust cured article of press molding in the shaping die of packing into the dust that produces in the production iron and steel processes such as smelting furnace, main component is iron and oxide compound thereof, it does not contain unnecessary additives such as tackiness agent, having is enough to satisfy the practical intensity that requires, operability when utilizing again is good, and can be with lower cost manufacturing.
The of the present invention the 1st constitutes the steel-making dust cured article of scheme, and pack into the cured article of press molding in the shaping die of the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is characterized in that, for pressurization area of section x (mm 2) compacting pressure (MPa) be the scope that is expressed from the next
5≤P≤-96.785ln(x)+958.97 ......(1)
Compacting pressure does not need to add tackiness agent etc. and just can form the steel-making dust cured article that has sufficient intensity in the practicality in this scope the time.If compacting pressure is lower, the steel-making dust cured article will be defeated and dispersed when the demoulding or when manipulation.According to test, the minimum compacting pressure of not overslaugh operation is about 5MPa.When improving compacting pressure, the dropping strength of steel-making dust cured article and apparent density increase, but the growth of dropping strength and density slows down.When shaping pressure surpasses one regularly, will produce the lamellated be full of cracks (this phenomenon is called as layering) with compacting pressure direction vertical direction, the phenomenon of steel-making dust cured article breakage takes place when the demoulding.The minimum compacting pressure of not overslaugh operation is not subjected to the influence of the diameter of steel-making dust cured article, approximately be 5MPa, relative therewith, produce the diameter that stratified compacting pressure depends on the steel-making dust cured article to a great extent, its diameter is big more, and it is more little to produce stratified compacting pressure.Under the condition of each diameter, than producing the lower slightly compacting pressure value of stratified compacting pressure and being variable x (mm by the area of section that diameter is calculated to add pressure surface 2) the conditional that does not produce stratified compacting pressure upper limit Pmax (MPa) be
Pmax(MPa)＝-96.785ln(x)+958.97
According to this formula, not needing to add the compacting pressure scope that tackiness agent etc. can form the steel-making dust cured article that has sufficient intensity in the practicality is the scope shown in above-mentioned (1) formula.
In the present invention, the profile of above-mentioned steel-making dust cured article also can be a cylindrical shape.
When being manufacturing, the shape of steel-making dust cured article can preferably be convenient to make and realize easily the shape of stay in gradeization according to the shape of the area of section control compacting pressure that adds pressure surface.Such shape has the cylinder bodily form and the prismatic bodily form, preferentially selects the less cylinder bodily form of corner angle portion for use.
In tubular occasion, the size of above-mentioned steel-making dust cured article is diameter 30-100mm preferably, and height is 30-150% with diameter ratio.
Diameter is during less than 30mm, because undersized, production efficiency is low.When diameter surpasses 100mm, owing to destroy easily during the influence of deadweight operation, and cause problem such as solidification equipment maximization.When diameter was 30-100mm, its size and the balance of time production cycle were good, production efficiency height, more preferably 50-80mm.
Height and diameter ratio, if increase the ratio of height, because molding and metal pattern internal surface and powder friction effect to each other, the transmission loss of pressure increases, conformality reduces.Height and diameter ratio be less than 30% o'clock, though apparent density improves, owing to form the flat pattern of thin-walled, thereby the intensity of steel-making dust cured article goes wrong when practical.Height surpasses at 150% o'clock with diameter ratio, and apparent density is low, and the intensity of steel-making dust cured article reduces.Above-mentioned ratio is in the 30-150% scope time, and apparent density roughly is stabilized in certain value, thereby the intensity stabilization of steel-making dust cured article, and the balance of diameter and height is also fine, thereby the operation of steel-making dust cured article ratio is easier to.
The of the present invention the 1st constitutes the steel-making dust cured article of another example of scheme, pack into the cured article of press molding in the shaping die of the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof, it is characterized in that its apparent density 2.25-3.1g/cm under the state of complete drying 3The scope of this apparent density is all applicable in above-mentioned each formation scheme of the present invention.
According to test, not needing to add the apparent density scope that tackiness agent can have the complete drying state of the steel-making dust cured article that is enough to satisfy the practical intensity that requires is 2.25-3.1g/cm 3
The of the present invention the 1st constitutes the manufacture method of the steel-making dust cured article of scheme, the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the manufacture method of making as its cured article in the shaping die, it is characterized in that, for pressurization area of section x (mm 2) compacting pressure P (MPa) be the scope that is expressed from the next.
5≤P≤-96.785ln(x)+958.97
Adopt this method to make the steel-making dust cured article of press molding, the operability when utilizing again is good, does not contain the intensity that extra additive can have is enough to satisfy practical requirement, and can be with lower production cost manufacturing.
The manufacture method of the steel-making dust cured article of another example of the 1st formation scheme of the present invention, the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that, detect compacting pressure with pressure-detecting device, utilize this detected value to carry out the pressure that pressurized control makes it to reach regulation.
Adopt this formation scheme, one side detects compacting pressure, one side utilizes this measured value to carry out pressurized control, can under suitable moulding pressure, carry out the shaping of steel-making dust cured article, therefore not need to add tackiness agent etc. and just can easily make the steel-making dust cured article that has sufficient intensity in the practicality.
The of the present invention the 1st constitutes the manufacturing installation of the steel-making dust cured article of scheme, the dust press molding that produce producing in the iron and steel process, main component is iron and oxide compound thereof makes it to solidify the device of making as its cured article, it is characterized in that this device has: with the shaping die of above-mentioned dust press molding; Be used for the pressing mechanism of exerting pressure at this shaping die press molding; Detect the pressure detection mechanism of the compacting pressure of above-mentioned shaping die; Utilize the above-mentioned pressing mechanism of detected value pressurized control of this pressure detection mechanism to make it to reach the pressurized control mechanism of specified pressure.
By adopting this formation scheme, detect compacting pressure, utilize this measured value to carry out pressurized control, thereby can under suitable moulding pressure, carry out the shaping of steel-making dust cured article, therefore not need to add tackiness agent etc. and just can easily make the steel-making dust cured article that has sufficient intensity in the practicality.
The of the present invention the 2nd constitutes the steel-making dust cured article of scheme, pack into the cured article of press molding in the shaping die of the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof, it is characterized in that the dust in the above-mentioned shaping die of packing into is the granulation body.
The of the present invention the 2nd constitutes the manufacture method of the steel-making dust cured article of scheme, the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that, with above-mentioned dust granulation, with the state of the granulation body press molding in the above-mentioned shaping die of packing into.
In the forming process of steel-making dust cured article, even improve compacting pressure, because the cause of internal friction, intensity also may not necessarily improve.Using tackiness agent is highly effective for the intensity that strengthens the steel-making dust cured article, if but add the tackiness agent of plastics etc., owing to the reason of production cost recited above and environmental pressure aspect is unfavorable.For this reason, the inventor has carried out various investigations and experiment, found that, under identical molding condition, if above-mentioned dust is with the state of the granulation press molding in the shaping die of packing into, with being packed into to pressurize in the shaping die with pulverulence, above-mentioned dust compares, can obtain higher shaping density.Use dust press molding,, also can obtain being enough to satisfy the intensity of the practical steel-making dust cured article that requires even do not use reinforcer such as tackiness agent especially through granulation.
Constitute in the steel-making dust cured article and manufacture method thereof of scheme the of the present invention the 2nd, the water ratio of above-mentioned granulation body also can be 0.5-15wt%.
If the water ratio of granulation body is lower than 0.5wt%, can contain crackle etc. in the steel-making dust cured article after the shaping, being shaped is impossible basically, on the contrary if the water ratio of granulation body surpasses 15wt%, the granulation body softens and becomes the mud shape, is difficult to granulation.In addition, it is believed that when the granulation body showed the viscous deformation behavior in shaping die, moisture had the friction that reduces between powder, the effect that distortion is carried out easily.Thisly manifest when acting on water content 0.5wt%, but amount of moisture is more, when water content surpassed 10wt%, because moisture itself produces the fluidic proterties, thereby effect was run counter to desire for the apparent density of raising steel-making dust cured article.The water content ranges of steel-making dust granulation body that can be met the intensity of the practical steel-making dust cured article that requires is 0.5-15wt%.
The of the present invention the 3rd constitutes the steel-making dust cured article of scheme, pack into the cured article of press molding in the shaping die of the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof, it is characterized in that, the raw material of the above-mentioned shaping die of packing into is above-mentioned steel-making dust and be the mixture of the powder of main component with carbon, and described is that the amount of the powder of main component is the 1-40wt% of raw material with carbon.Cured article is the size dimension of briquetting degree preferably.
The of the present invention the 3rd constitutes the manufacture method of the steel-making dust cured article of scheme, the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that, the raw material of above-mentioned shaping die of packing into is above-mentioned steel-making dust and be the mixture of the powder of main component with carbon, and described is that the amount of the powder of main component is the 1-40wt% of raw material with carbon.
The steel-making dust that is used for electric furnace etc. in recovery adds carbon materialses such as carbon dust at briquetting, for the thermo-efficiency that improves electric furnace is extremely important, this be because, the carbon dust that adds is with steel-making dust reductive spontaneous combustion simultaneously heating, thereby can reduce the energy of importing by the outside, improve the thermo-efficiency of stove greatly.Therefore, the briquetting that has added carbon dust is highly effective measure for the recycling of steel-making dust.For this reason, the inventor has carried out various investigations and experiment, found that, the carbon dust amount of interpolation is the 40wt% of powdered mixture of steel-making dust and carbon dust when following, can obtain high shaping density.When being the powder mixes postforming of main component with steel-making dust and with carbon like this, with what add is the 1-40wt% that the addition of the powder of main component is set at powdered mixture with carbon, even do not use reinforcers such as tackiness agent especially, also can obtain having in the practicality steel-making dust cured article of sufficient intensity.
In the steel-making dust cured article of this formation scheme, the apparent density of above-mentioned cured article can be 1.8-3.3g/cm under the complete drying state 3
If consider with carbon be main component powder addition and can the solidified compacting pressure, the apparent density of steel-making dust cured article is 1.8-3.3g/cm under the complete drying state 3The time, can keep the intensity that can carry out manipulation.
In addition, be that the powder of main component also can be carbon dust or graphite with carbon.
The of the present invention the 4th constitutes the manufacture method of the steel-making dust cured article of scheme, the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making its cured article in the shaping die, it is characterized in that the water ratio of the dust of the above-mentioned shaping die of packing into is 0.5-20wt%.
Even the raising compacting pressure, because causes such as internal friction, intensity also may not improve.In order under the condition of not using additives such as tackiness agent, to make steel-making dust cured article,, must improve the flowability and the pressure transmission of the dust when being shaped as the countermeasure that improves fabrication strength with sufficient intensity.The inventor has carried out various investigation and experimental verification, found that, the flowability of powder and pressure transmission are along with moisture contained in the steel-making dust is water ratio and changing.Learn that thus making the water ratio scope that has the necessary steel-making dust of steel-making dust cured article of sufficient intensity in the practicality is 0.5-20wt%.
When water ratio was lower than 0.5wt%, even improve compacting pressure, the pressure transmission that can not obtain to meet the demands can't obtain having in the practicality steel-making dust cured article of sufficient intensity.When water ratio surpasses 15wt%, the impatient height that rises sharply of pressure transmission, water ratio roughly obtains 100% pressure transmission near 20wt% the time.When water ratio surpassed 20wt%, moisture entered between the powder of dust in a large number, by the close filling effect forfeiture that rearranges generation of powder, occupied an leading position because of the combination that the surface tension of water produces, and solidified the difficulty that becomes.Therefore, the steel-making dust water content that can obtain the intensity of practical steel-making dust cured article is the scope of 0.5-20wt%, preferably the scope of 1.5-15wt%.The intensity of the steel-making dust cured article of described practicality is not produce defeated and dispersed intensity when transportation and operation basically.
The of the present invention the 4th constitutes the producing apparatus of the steel-making dust cured article of scheme, the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the equipment of making as its cured article in the shaping die, it is characterized in that this equipment has: above-mentioned shaping die; Plunger to the pressurization of the dust in this shaping die; Drive the pressurizing device of this plunger; And be used to adjust the water ratio regulating mechanism of water ratio of the steel-making dust before the above-mentioned shaping die of packing into;
Described water ratio regulating mechanism makes the water ratio of the dust of the shaping die of packing into reach 0.5-20wt%.
Adopt the producing apparatus of this structure, be used to adjust the water ratio regulating mechanism of the steel-making dust water content before the shaping die of packing into owing to be equipped with, the dust water ratio that makes the shaping die of packing into is 0.5-20wt%, thereby can implement above-mentioned manufacture method of the present invention, do not need to add tackiness agent etc. and just can make the steel-making dust cured article that has sufficient intensity in the practicality.
The of the present invention the 5th constitutes the manufacturing installation of the steel-making dust cured article of scheme, the dust that produce producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the equipment of making as its cured article in the shaping die, it is characterized in that this equipment has: as the raw material of the above-mentioned shaping die of packing into is the prilling granulator that the mixing granulation body is made in powder mixes, the granulation of main component with above-mentioned dust with carbon; Above-mentioned shaping die; Plunger to the pressurization of the mixing granulation body in this shaping die; Drive the pressurizing device of this plunger; And be used to adjust the water ratio regulating mechanism of water ratio of mixing granulation body of above-mentioned shaping die of packing into.
Adopt the producing apparatus of this structure, owing to have prilling granulator, with above-mentioned dust with carbon is the powder mixes granulation of main component, make the mixing granulation body, be used as the raw material of the shaping die of packing into, thereby in the raw material dust of supplying with, do not add additive as much as possible and just can make the steel-making dust cured article with low production cost, this steel-making dust cured article has the intensity that is enough to satisfy practical requirement, and can improve the furnace thermal efficiency when reinstalling in the stove.
In the forming process of steel-making dust cured article, even improve compacting pressure, because the cause of internal friction, intensity also may not necessarily improve.Using tackiness agent is effectively for the intensity aspect that strengthens the steel-making dust cured article, if but add tackiness agent such as plastics, owing to the reason of above-mentioned production cost and environmental pressure aspect is unfavorable.
In addition, adding carbon materials such as carbon dust in the employed steel-making dust cured article of recycling of electric furnace etc. is extremely important for the thermo-efficiency that improves electric furnace.This is because the carbon dust that is added constantly carries out reductive spontaneous combustion simultaneously heating with steel-making dust, thereby can reduce the energy by the outside input, improves the thermo-efficiency of stove greatly.Therefore, the steel-making dust cured article of interpolation carbon dust is a highly effective measure for the recycling of steel-making dust.With carbon is the powder of main component, same with steel-making dust, can obtain easily in the process of production iron and steel or at its periphery, also can suppress the production cost increase even therefore add.But, add the intensity that carbon materials might damage cured article.
Therefore, the inventor has carried out various investigation and experimental verification, found that, under identical molding condition, above-mentioned dust with the state of the granulation press molding in the shaping die of packing into, is compared with above-mentioned dust is packed into to pressurize in the shaping die with pulverulence, can be obtained higher shaping density.Use this dust through granulation to carry out press molding,, also can obtain having in the practicality intensity of the steel-making dust cured article of sufficient intensity even do not use reinforcer such as tackiness agent especially.
Particularly, the manufacturing installation of this structure since use with above-mentioned dust and with carbon as the mixing granulation body of the powder mixes granulation of main component as raw material, thereby to have interpolation simultaneously be the benefit brought of the powder of main component and with pack into the benefit of press molding in the shaping die of granulation state with carbon.Therefore, the effect that additive can have is enough to satisfy the practical intensity that requires can be more effectively realized not adding as much as possible, in addition, the thermo-efficiency of the stove when reinstalling in the stove can also be improved.
Constitute in the manufacturing installation of scheme the of the present invention the 4th and the 5th, described water ratio regulating mechanism can use sprinkler system, also can use drying installation.When low, use sprinkler system to improve water ratio as the water ratio of the dust of raw material.When higher, use drying installation to reduce water ratio as the water ratio of the dust of raw material.
Constitute in the manufacturing installation of scheme at the of the present invention the 4th manufacturing method and apparatus and the 5th that constitutes scheme, the corrosion resistant material also can be used in surface shaping die and plunger, that contact with the steel-making dust cured article when being shaped at least.These shaping dies and plunger also can all be the corrosion resistant materials, and but, in the occasion that a plurality of parts is combined into shaping die, also can have only the parts on the surface that contacts with the steel-making dust cured article when being shaped is the corrosion resistant material.
The metal part branch that aqueous dust can promote to comprise the device of shaping die gets rusty, and therefore the rust preventing of device is absolutely necessary.Particularly antirust wet goods should not be used in the surface that contacts with steel-making dust of shaping die and plunger, preferably uses the corrosion resistant material.
Above-mentioned corrosion resistant material can be the material more than a kind or a kind that is selected from Wimet, sintering metal, pottery and the stainless steel.
In addition, also can on surface above-mentioned shaping die and plunger, that contact with the steel-making dust cured article when being shaped at least, form the rust stable overlay film.The rust stable film can be chromium coating or nickel layer, also can be the nitride of chromium, the carbide of chromium, the nitride of titanium, the carbide of titanium or the coatings such as carbon of diamond lattic structure, can also be the above-mentioned combination more than 2 kinds or 2 kinds in addition.
Description of drawings
The explanation of the following preferred implementation by the reference accompanying drawing can more be expressly understood the present invention.But embodiment and accompanying drawing just are used for diagram and explanation, should not be construed as limiting the scope of the invention.Scope of the present invention is defined by the claims.In the accompanying drawings, the same parts label that occurs in a few width of cloth accompanying drawings is represented same part.
Fig. 1 is the technological process explanatory view of the steel-making dust cured article manufacture method of the 1st embodiment of the present invention.
Fig. 2 is the synoptic diagram of the steel-making dust cured article manufacturing installation that uses in this manufacture method.
Fig. 3 is the stereographic map of the example of the steel-making dust cured article made of this method of expression.
Fig. 4 is the sectional drawing that becomes the shaping die that uses in the solidity test on basis of above-mentioned manufacture method.
Fig. 5 is that expression is with employed steel-making dust of above-mentioned solidity test and Fe 3O 4The result's of XRD relatively diagram.
Fig. 6 is the diagram of the SEM photo of the above-mentioned steel-making dust of expression.
Fig. 7 is the diagram of relation of the failure energy of the compacting pressure of the steel-making dust cured article that is shaped in the solidity test of expression and shatter test.
Fig. 8 is the diagram of relation of the failure energy of expression apparent density of above-mentioned steel-making dust cured article and shatter test.
To be that the pressurization principal transversal of this steel-making dust cured article of expression is long-pending keep the diagram of relation of the compacting pressure scope of shape with the steel-making dust cured article to Fig. 9.
Figure 10 is the diagram of the relation of the expression height of above-mentioned steel-making dust cured article and diameter ratio and apparent density.
Figure 11 is the technological process explanatory view of the steel-making dust cured article manufacture method of the 2nd embodiment of the present invention.
Figure 12 is the sectional view that becomes the shaping die that uses in the solidity test on basis of above-mentioned manufacture method.
Figure 13 is the diagram that is illustrated in the relation of the water content of the steel-making dust cured article that is shaped in the solidity test and compacting pressure.
Figure 14 is the diagram of the relation at expression water content of this steel-making dust cured article and slope of repose.
Figure 15 is the explanatory view of the measuring method at slope of repose.
Figure 16 is that the partial cutaway of the shaping die in the manufacturing installation of steel-making dust cured article of another example of expression the 2nd embodiment of the present invention is shown front view.
Figure 17 is the technological process explanatory view of the steel-making dust cured article manufacture method of the 3rd embodiment of the present invention.
Figure 18 is the carbon dust addition of expression steel-making dust cured article and the graphic representation of the relation of the height of fall that can keep shape.
Figure 19 is the technological process explanatory view of the steel-making dust cured article manufacture method of the 4th embodiment of the present invention.
Figure 20 is the graphic representation of the relation of the water ratio of expression granulation granulation body and apparent density.
Figure 21 is to use the process explanation figure of manufacturing installation of the steel-making dust cured article of the 5th embodiment of the present invention.
Figure 22 is the graphic representation of the relation of expression water ratio and briquetting apparent density.
Embodiment
Below with reference to Fig. 1-10 explanation the 1st embodiment of the present invention.Among Fig. 1, the steel-making dust that produces in smelting furnace 1 is imported in the particle collector 3 by vapor pipe 2 with exhaust, and the control of dust in particle collector 3 of the steel-making dust 11 in the exhaust is discharged behind the formation powder.The main component of this steel-making dust 11 is iron and oxide compound thereof.The steel-making dust 11 of being discharged by particle collector 3 is admitted to by the transfer mechanism (not shown) in the hopper 5 of producing apparatus 4 of steel-making dust cured article.In the process of carrying with above-mentioned e Foerderanlage, also can carry out the suitable pre-treatment of steel-making dust 11, for example remove processing such as moisture and granulation.Steel-making dust 11 in the hopper 5 is assigned with, puts in a plurality of curing mechanism portions 6 that are set up in parallel of steel-making dust cured article producing apparatus 4.Curing mechanism portion 6 is solidified into the mechanism that presses blocky steel-making dust cured article B with steel-making dust.
As amplifying expression among Fig. 2, curing mechanism portion 6 has: the shaping die 7 of steel-making dust 11 press moldings that will be sent into by above-mentioned hopper 5; This shaping die 7 is applied the pressing mechanism 8 of the pressure of press molding; Detect the pressure detection mechanism 9 of the compacting pressure of above-mentioned shaping die 7; And the detected value that utilizes this pressure detection mechanism 9 is controlled the pressurized control mechanism 10 that above-mentioned pressing mechanism 8 makes it to reach specified pressure.
Shaping die 7 is drum-shaped chamber longitudinally, steel-making dust 11 can be configured as transverse shape and be circular column (being right cylinder).Specifically, shaping die 7 is to be made of the piston-shaped lid 12A in columnar former 7a and this former of the insertion 7a lower ending opening.Lid 12A opens by the lid closing mechanism (not shown) with drive source and is closed.Lid 12A also can not insert in the shaping die 7 and sealing at one end.
Pressing mechanism 8 is by entering from the top in the shaping die 7, the plunger 12 of the free lifting of 11 pressurizations of the steel-making dusts in the shaping die 7 and the pressurizing device 13 that drives these plunger 12 liftings being constituted.Pressurizing device 13 for example is made of hydro-cylinder, and its driving is to be controlled by pressurizing device controlling organization 14.14 controls of pressurizing device controlling organization are to the reversing valve 16 of the hydraulic circuit 15 of above-mentioned pressurizing device 13 supply hydraulic efficiency oil and the motor 18 of oil pump 17 etc.Except hydro-cylinder, pressurizing device 13 can also be a motor and with its rotation/linear motion converting mechanisms such as being transformed into straight-line ball-screw that rotatablely moves (all not shown among the figure).
Pressure-detecting device 9 gets final product so long as can directly or indirectly measure the compacting pressure of briquetting (steel-making dust cured article B), for example can be the fuel pressure gage of detection to the oil pressure of the hydraulic circuit 15 of above-mentioned pressurizing device 13 supply hydraulic efficiency oil.In addition, pressure-detecting device 9 can also be that device that load cell measures etc. is installed on plunger 12.
Pressurized control mechanism 10 is by constituting at the pressure controlled valve 19 that is provided with of above-mentioned hydraulic circuit 15 midway with as the pressurized control portion 20 of the part setting of above-mentioned pressurizing device controlling organization 14.Pressurized control portion 20 is detected values of utilizing above-mentioned pressure detection mechanism 9 to measure, wait the mechanism that controls above-mentioned pressure controlled valve 19 by feedback control.
The following describes that the steel-making dust cured article producing apparatus 4 that uses the 1st embodiment is made the method for steel-making dust cured article B and the steel-making dust cured article B that makes utilize method.In smelting furnace 1, produce and be admitted to hopper 5, send into by hopper 5 in the shaping die 7 of curing mechanism 6 by the dust 11 of discharging after forming powder in the particle collector 3.The main component of this pulverous steel-making dust 11 is iron and oxide compound thereof.Solidified steel-making dust cured article B collects in the returnable (not shown) in curing mechanism 6, when dropping into raw material in smelting furnace 1, drops in the smelting furnace 1 with other raw material, utilizes again as steelmaking feed.Drop into the raw material in the smelting furnace 1, main raw material for example is the molten iron that is obtained by blast furnace, in addition, uses scrap iron and unslaked lime etc. as auxiliary material.
The following describes the operation of the curing mechanism 6 in the above-mentioned manufacture method.When dropping in shaping dies 7 by hopper 5 dust 11 of specified amount, plunger 12 drives by pressurizing device 13 and enters in the shaping die 7, the dust in the shaping die 7 11 is applied the pressure of regulation under this state.At this moment, for pressurization area of section (being the area of section of plunger 12) x (mm 2) compacting pressure P (MPa) be in the scope shown in the following formula, exerting pressure reaches setting range.
5≤P≤-96.785ln(x)+958.97
This pressure-controlling is to be undertaken by pressurized control device 10.That is, with the measured value of pressure-detecting device 19 as value of feedback, by the pressurized control portion 20 control pressure control valves 19 of pressurizing device controlling organization 14.
The steel-making dust cured article B that makes so as shown in Figure 3, its profile is the cylinder bodily form.In addition, the diameter D of this steel-making dust cured article B is that 30-10mm, height H are more suitable for 30-150% with the ratio (H/D) of diameter D.
In order to investigate the plasticity of steel-making dust, the inventor uses the metal pattern 21 that is made of cylinder female part 21A, lid 21C and plunger 21B shown in Fig. 4 to carry out steel-making dust solidity test described below.Cylinder female part 21A, lid 21C among Fig. 4 and plunger 21B be with above-mentioned curing mechanism 6 (Fig. 2) in shaping die 7, lid 12A and the same parts of plunger 12.
The steel-making dust 11 that uses in this experiment is the steel-making dusts of discharging from electric furnace, and its apparent density is 1.4-1.8g/cm 3, composition is roughly Fe 3O 4The result of the XRD of this steel-making dust 11 shown in Fig. 5 (X-ray diffraction), its SEM shown in Fig. 6 (scanning electronic microscope) photo.
What represent among Fig. 7 is, according to above-mentioned metal pattern 21, as steel-making dust cured article (hereinafter to be referred as " briquetting "), changing various compacting pressures to make diameter D be 70mm, height H with the ratio (H/D) of diameter D is 80% cylindrical briquetting, forming pressure is carried out many variations make the result of the failure energy when relatively this briquetting destroys in shatter test.In addition, Fig. 8 represents the apparent density of above-mentioned briquetting under the complete drying state and the relation of above-mentioned failure energy.
By the result of Fig. 7 as can be known, the occasion that compacting pressure is lower, briquetting is defeated and dispersed when the demoulding or during operation.Not hindering the minimum compacting pressure of operation is about 5MPa.During elevated pressure, briquetting dropping strength and apparent density increase, but the growth of dropping strength and apparent density slows down gradually.When compacting pressure surpasses 180MPa, with the vertical direction of compacting pressure direction on produce so-called stratified lamellated be full of cracks, briquetting produces damaged during the demoulding.The highest briquetting dropping strength is to obtain in the lower slightly scope of stratified compacting pressure than taking place.
In addition, the result of Fig. 8 shows that the failure energy when apparent density and briquetting destroy has positive correlation in shatter test, can judge briquetting solidified state according to apparent density.
Fig. 9 represents be ratio (H/D) at the height H of briquetting and diameter D for the situation in the 50-110% scope under the result of relation of compacting pressure scope of investigation briquetting diameter D and briquetting maintenance shape.By this result as can be known, do not hinder the minimum compacting pressure of operation not rely on briquetting diameter D, be about 5MPa (lower-most point among the figure), relative therewith, produce stratified compacting pressure and depend on briquetting diameter D to a great extent, briquetting diameter D is big more, and it is more little that stratified compacting pressure takes place.According to this result, can obtain than producing the lower slightly compacting pressure value of stratified compacting pressure and establish the pressure surface area of section that adds of being calculated by briquetting diameter D under each briquetting diameter D condition is variable x (mm 2), formula that stratified compacting pressure upper limit Pmax (MPa) condition does not take place
Pmax＝-96.785ln(x)+958.97
The effect of briquetting solidified is that the rearranging with the sticking power that contacts generation of powder particle that causes during by press molding embodies.Contact area between the powder is big more, and the sticking power of powder is high more, thereby as long as improve compacting pressure, increases the contact area between powder, and briquetting intensity will improve.If this effect is only arranged, compacting pressure is high more so, and briquetting intensity ought to be big more, but the stratiform that in fact can take place to cause because of layering under a certain compacting pressure is destroyed.Layering be because, raw material powder is forced to displacement and forms definite shape during press molding in shaping die, the so-called resilience that its size expands during the demoulding causes.
In the occasion that single shaft is shaped, the compacting pressure on the briquetting short transverse is more much bigger than former radial restraint force, therefore produces the shaping density difference, density line such as shaping such as formations grade in briquetting with on the direction of shaping direction approximate vertical.During the demoulding, since radially with short transverse on the sprung back, volumetric expansion takes place, under excessive compacting pressure, shaping density difference gradient on the short transverse is bigger, resilience displacement on waiting shaping density line during owing to the demoulding increases in the strain that produces, and produces with the vertical stratiform of compression aspect to destroy.
Therefore, the stratified absolute value that depends on briquette forming density difference and springback capacity to a great extent that occurs in.The shaping density difference of briquetting depends on the absolute value of briquetting height H, and the absolute value of springback capacity depends on the size of briquetting, and therefore, the diameter D of briquetting is big more, and it is more little to produce stratified compacting pressure.
If adding the area of section of pressure surface is x (mm 2), the scope that briquetting demonstrates the compacting pressure (MPa) of practical intensity is:
5≤P≤Pmax
Pmax＝-96.785ln(x)+958.97
Preferred range is:
25≤P≤Pmax×0.9
Pmax＝-96.785ln(x)+958.9
This is because compacting pressure can obtain dropping strength to a certain degree when 25MPa is above, thereby the processing ease of briquetting carries out.In addition, when the Pmax drape forming,,, can prevent effectively really that layering from taking place if be equivalent to about 90% the compacting pressure of Pmax because the characteristic variations of raw material powder and the heterogeneity of compacting pressure have the stratified danger of generation.The shape of briquetting so long as can get final product according to the area of section control compacting pressure that adds pressure surface, can be considered cylindrically, prismatic etc., preferentially selects cylindrically, and the corner angle of its briquetting are fewer.
What Figure 10 represented is, is to change the result that the apparent density of the complete drying state of the briquetting that height H and the ratio (H/D) of diameter D make changes under the certain condition of 70mm, compacting pressure at diameter D.As shown in Figure 8, as the sticking power of the apparent density of the index of powder contact area size and powder rise mainly as briquetting intensity have positive correlation, change the variation that the variation of the apparent density of the briquetting that height H and the ratio (H/D) of diameter D make brings briquetting intensity.The ratio (H/D) of height H and diameter D is in the 10-110% scope time, and apparent density does not have too big difference, and the ratio (H/D) of height H and diameter D was above 110% o'clock, the apparent density of briquetting reduces, surpass at 150% o'clock, the reduction of density is obvious, reaches at 180% o'clock and causes that shaping is bad.
In addition, if increase the ratio (H/D) of height H and diameter D, since side surface and the powder frictional force to each other of molding and former 21A, the transmission loss increase of pressure, the centre of briquetting and reduce with the pressure at the position of a work plunger 21B opposite side, conformality is low.Therefore, wish that the ratio (H/D) of the height H of briquetting and diameter D is between 30-150%, preferably between the 50-110%.The ratio (H/D) of height H and diameter D was less than 30% o'clock, though the apparent density height, because briquetting becomes the tabular of thin-walled, the intensity existing problems of the briquetting in the practicality.The ratio (H/D) of height H and diameter D was greater than 150% o'clock, and as mentioned above, apparent density reduces, and briquetting intensity is low.The ratio (H/D) of height H and diameter D is when 50-110%, and apparent density roughly is stabilized in certain value, thereby the briquetting intensity stabilization, because diameter D and height H balance are good, thereby the processing ease of briquetting carries out.
Diameter D is advisable at 30-100mm, preferably 50-80mm.Diameter D is during less than 30mm, and briquetting itself is too small, produce rate variance, otherwise during greater than 100mm, briquetting itself is excessive, because problems such as deadweight influence generation destructions, and causes problem such as device maximization during operation.Diameter D is between 50-80mm the time, and the size of briquetting and the balance of recovery time are good, and production efficiency improves.
According to above-mentioned test-results, preferably, when making steel-making dust cured article B with steel-making dust cured article manufacturing installation 4, for pressurization area of section (being the area of section of plunger 12) x (mm by above-mentioned embodiment 2), the scope that compacting pressure P (MPa) represents for following formula
5≤P≤-96.785ln(x)+958.97
In addition, the steel-making dust cured article B that makes as shown in Figure 3, its profile is the cylinder bodily form, diameter D is 30-100mm, height H is 30-150% with the ratio (H/D) of diameter D.
Like this, can with lower production cost will produce produce in the iron and steel process, main component is that the dust of iron and oxide compound thereof reclaims and to manufacture good the having sufficient intensity and do not contain the cured article of unnecessary additive of operability.
In addition, when the profile of steel-making dust cured article B is right cylinder, can controls compacting pressure according to the area of section that adds pressure surface during manufacturing, thereby make easily.When the diameter D of steel-making dust cured article B is 30-100mm, height H with the ratio (H/D) of diameter D for 30-150%, good shape retention, operability and production efficiency improve.
In addition, detect compacting pressure, utilize this detected value to carry out the pressure that pressurized control makes it to reach regulation, the pressurized control in the time of therefore can carrying out steel-making dust curing easily and exactly with pressure detection mechanism.
Employed steel-making dust cured article producing apparatus 4, owing to have the pressure detection mechanism 9 of the compacting pressure that detects shaping die 7 and utilize the detected value of this pressure detection mechanism 9 that above-mentioned pressing mechanism 8 is carried out pressurized control, make it to reach the pressurized control mechanism 10 of specified pressure, thus can be good with the good production efficiency manufacturing operation, steel-making dust cured article B with sufficient intensity.
In addition, as mentioned above, Fig. 8 represent the steel-making dust cured article be briquetting the complete drying state apparent density and fall the destructive energy.Apparent density at the complete drying state that does not hinder the steel-making dust cured article under the minimum compacting pressure 5MPa of operation is 2.25g/cm 3, be 3.1g/cm than the apparent density that produces the lower slightly scope of stratified compacting pressure, promptly obtaining the complete drying state of the steel-making dust cured article under the pressure of dropping strength of the highest steel-making dust cured article 3Therefore, not adding the apparent density scope that tackiness agent etc. can have a complete drying state of the practical steel-making dust cured article of going up sufficient intensity is 2.25-3.1g/cm 3, preferred scope is the apparent density 2.5g/cm with the complete drying state compacting pressure 25MPa that obtains dropping strength to a certain degree, the steel-making dust cured article 32.5-3.1g/cm for lower limit 3Scope.In addition, the lower limit of apparent density also can be 2.25g/cm 3
In above-mentioned test, be to use the steel-making dust of discharging to make briquetting by electric furnace, but, the dust 11 that uses among the present invention also can use the dust that produces in converter, blast furnace or other steelmaking process so long as to produce the main component that produces in the iron and steel process be that the dust of iron and oxide compound thereof gets final product.In addition, in the occasion of adding various metals and oxide compound thereof, carbon, inorganics etc. as required, as long as additive is powder and its addition plasticity obviously not being influenced, also can be the mixing dust that has added these materials.
In addition, although not explanation in the steel-making dust cured article manufacturing installation 4 of embodiment, preferably be provided with in addition a control in shaping die 7, pack into dust 11 loading level, make height H and the ratio (H/D) of diameter D of the steel-making dust cured article B of shaping reach the mechanism of prescribed value.The direction of shaping die has no particular limits, and is occasion longitudinally as embodiment shaping die direction, for dust 11 is filled in the shaping die 7, can uses the powder feeding machine and utilize screw rod mechanism such as to be pressed into; Direction at shaping die is horizontal occasion, can use by screw rod and mechanism such as be pressed into.
The following describes the 2nd embodiment of the present invention.As shown in figure 11, the 2nd embodiment is different with the 1st embodiment, is on the path of the shaping die 7 of steel-making dust 11 being sent into curing mechanism 6 from particle collector 3, and the water ratio regulating mechanism 19 of the water content be used for regulating steel-making dust 11 is set.For example, in the inside of the path of sending into hopper 5, hopper 5 or on above-mentioned water ratio regulating mechanism 19 is set by the position, arbitrary place of hopper 5 in this three of path of shaping die 7 supply steel-making dusts.
Water ratio regulating mechanism 19 can make for example with sprinkler system or drying installation.Sprinkler system can use sprinkler, divider etc., and drying installation can be enumerated heated oven, storage heater, gas blower etc.
These water ratio regulating mechanisms 19 are regulated water ratio, make the water ratio of steel-making dust 11 reach the interior setting range of 0.5-20wt%, the preferably setting range in the 1.5-15wt%.
In addition, in hopper 5 or curing mechanism 6, the pressure filling mechanism 30 that will be filled into by steel-making dust 11 pressures that hopper 5 is supplied with in the shaping die 7 is set.Other structure is identical with the 1st embodiment.
In the 2nd embodiment, preferably, in the shaping die 7 of Fig. 2 and the plunger 12, the surface that contacts with steel-making dust 11 when being shaped at least uses the corrosion resistant material.The corrosion resistant material preferentially be selected from Wimet, sintering metal, pottery and the stainless steel more than at least a kind or a kind.
Replace the schemes of shaping die 7 and plunger 12 itself as the corrosion resistant material, as shown in figure 16, also can be in shaping die 7 and plunger 12, formation rust stable overlay film 31,32 and 33 on the surface that contacts with steel-making dust 11 when being shaped at least.Described corrosion resistant overlay film 31-33, can use in the carbon of carbide, diamond lattic structure of nitride, the titanium of carbide, the titanium of the nitride that is selected from chromium plating, nickel plating, chromium, chromium more than at least a kind or a kind.
The producing apparatus 4 (Figure 11) that the following describes the steel-making dust cured article that uses this embodiment make the method for briquetting (steel-making dust cured article) B and the briquetting B that makes utilize method.To in smelting furnace 1, produce and pack in the hopper 5, send in the shaping die 7 of curing mechanism 6 by hopper 5 again by the steel-making dust 11 of discharging after forming powder in the particle collector 3.The main component of this Powdered steel-making dust 11 is iron and oxide compound thereof.
Above-mentioned steel-making dust 11 was adjusted water ratio with water ratio regulating mechanism 19 before sending into shaping die 7, make the water ratio of steel-making dust 11 reach the interior scope of 0.5-20wt%, the preferably setting range in the 1.5-15wt%.Above-mentioned setting range is so long as set suitable scope and get final product in above-mentioned upper and lower bound scope.
In curing mechanism 6, the steel-making dust 11 of specified amount is sent in the shaping die 7 by hopper 5, plunger 12 enters in the shaping die 7 by the driving of pressurizing device 13 then.Under this state, the steel-making dust 11 in the shaping die 7 is applied the pressure of regulation.At this moment, for pressurization area of section (being the area of section of plunger 12) x (mm 2) apply the scope that shaping pressure P (MPa) makes it to reach regulation.
Briquetting B and the 1st embodiment made like this are same, and its profile is a right cylinder as shown in Figure 3, have the ratio (H/D) of the diameter D of regulation and height H and diameter D, are used as steelmaking feed again.
Adopt manufacture method and the equipment of the briquetting B of this embodiment, the water ratio of steel-making dust 11 can be adjusted in the 0.5-20wt%, thereby do not need to add tackiness agent etc. and just can make the briquetting that has sufficient intensity in the practicality.The following describes its mechanism.
Do not using tackiness agent etc. to improve the occasion of the additive of molding intensity, the solidification of briquetting B be the powder particle that causes during by press molding rearrange and since the sticking power that contact produces embody.In general, the contact area between powder is big more, and the sticking power of powder is strong more, thereby as long as improve compacting pressure, increases the contact area between powder, and the intensity of briquetting B will improve.
But, since powder particle can not resemble freely change between its position and the powder the liquid and powder and formation mould surface between produce frictional force, insufficient during compression molding by the close filling effect that rearranges generation of powder, inside comprises very big void volume, perhaps because frictionloss causes the compacting pressure heterogeneity, at the bigger density difference of the inner generation of molding, thereby strengthen compacting pressure and may not necessarily improve fabrication strength.In addition, residual air in the molding internal voids and density difference, also be when removing the compacting pressure demoulding, under the lower compacting pressure scope, with the vertical direction of compacting pressure direction on produce the stratified major cause of stratiform be full of cracks.Therefore, for improving briquetting intensity by compacting pressure, flowability and the pressure transmission of improving powder are vital.
Usually, the tackiness agent that adds in order to improve fabrication strength, be not only in order to improve the solidification intensity of molding, its purpose also is the pressure transmission improving the flowability of powder and being shaped when to play the effect that improves plasticity by synthetically controlling powder characteristics.But, the objective of the invention is, do not use the briquetting that has the steel-making dust of sufficient intensity in the tackiness agent manufacturing practicality.
For this reason, the inventor has carried out various investigation and experimental verification, found that, the flowability of powder and pressure transmission be along with moisture contained in the steel-making dust is water ratio and changing, thereby determined to make the necessary steel-making dust water ratio of the briquetting scope that has the steel-making dust of sufficient intensity in the practicality.
The steel-making dust that is used to test is the dust of discharging from electric furnace, and its composition is roughly Fe 3O 4, the result (Fig. 5) of XRD (X-ray diffraction) is also identical with the 1st embodiment with SEM (scanning electronic microscope) photo (Fig. 6).But, for controlling moisture content, with steel-making dust in baking oven, 110 ℃ handled 24 hours down, make moisture evaporation, add the water content that moisture is adjusted to regulation then, as sample.
In order to investigate the plasticity of steel-making dust, the inventor has used the plunger 21B of shaping die shown in Figure 12 21 and pressurization usefulness, carried out steel-making dust cure test described below, described shaping die 21 is metal patterns that the lower plunger 21C by columnar former 21A and lid constitutes.The plunger 21B of the former 21A among Fig. 4, lower plunger 21C and pressurization usefulness, be with above-mentioned curing mechanism 6 (Fig. 2) in former 7a, lid 12A and the same parts of plunger 12.
Between substrate 22 that shaping die 21 is set and lid 21C, configuration load cell 23 is as transmitting piezometry mechanism.Utilization is to the compacting pressure of pressurization with the mensuration of the fuel pressure gage (not shown) in cylinder apparatus fuel supply path plunger 21B.
Compacting pressure (pressure of pressing machine) is 50MPa, and the diameter of briquetting B is φ 70, and height is the 50-110% scope with diameter ratio.The SKD11 that the material of test metal pattern uses SKH51 and handles through hard chrome plating.
The briquetting apparent density of the water content of steel-making dust shown in the table 1 and complete drying state and the dropping strength test-results of briquetting B.
The dropping strength test of the water content of table 1 steel-making dust and briquetting apparent density and briquetting
Water ratio (%) Apparent density (g/cm 3) Shatter test
10cm 30cm 50cm 70cm
0.2 2.32 ×
0.5 2.57 ○ ○ ×
1 2.63 ○ ○ ×
1.5 2.69 ○ ○ ○ ×
2 2.70 ○ ○ ○ ○
5 2.71 ○ ○ ○ ○
7 2.72 ○ ○ ○ ○
10 2.74 ○ ○ ○ ○
12 2.75 ○ ○ ○ ○
15 2.76 ○ ○ ○ ×
17 2.73 ○ ○ ○ ×
20 2.70 ○ ○ ○ ×
22 - Distortion
The apparent density of ※ 1 briquetting is the value of complete drying state
In ※ 2 shatter tests zero expression keeps shape, and * expression is damaged
As can be seen from Table 1, water content is in the 1.5-15wt% scope time, and apparent density slowly increases, and reaches maximum value during to 15wt%, and water content increases to 20wt%, and apparent density slowly reduces, but the briquetting apparent density in this scope is more stable.As for dropping strength, briquetting B does not destroy yet when 50-70cm highly falls, and has enough manipulation strengths.When the water content of steel-making dust was lower than 1.5wt%, the briquetting apparent density sharply reduced, and when apparent density reduced, dropping strength also descended.Water content forms viscosity shape cured article when 20wt% is above, briquetting behind the moisture drying is defeated and dispersed, thereby can't measure apparent density.In the test of briquetting dropping strength, briquetting B itself falls after strain.
In addition, when the water content of steel-making dust surpasses 15wt%, observe the phenomenon that moisture is discharged from the gap of former 21A and plunger 21C, along with water content increases, the amount of moisture of discharge also increases.
Figure 13 measures the water content of steel-making dust and result that the pressure of the lower plunger 21C when being shaped obtains.The pressure of lower plunger 21C can be thought the compacting pressure by briquetting B transmission, thereby with its index as the evaluation pressure transmission.When the water content of steel-making dust is lower than 0.5wt%,, have only the pressure below 50% or 50% to be transmitted for the compacting pressure of 50MPa.When water content surpassed 1.5wt%, pressure transmission was about 75%, to the almost not variation of pressure transmission of 15wt%.When water content surpassed 15wt%, impatient acute raising of pressure transmission when 20wt% is above, obtained the pressure transmission near 100%.
Figure 14 is the result who measures the slope of repose of the water content of steel-making dust and this steel-making dust.As shown in figure 15, the scarp of the conical accumulation horizon that the slope of repose formed when representing that powder drops on the horizontal plane from top to bottom naturally and the angle theta of horizontal plane, it is one of evaluation index of powder flowbility.The mensuration at slope of repose is used A.B.D powder characteristics tester (tube well physics and chemistry is learned the apparatus manufacturing).
The slope of repose is along with the water content of steel-making dust increases and increases, and when water content surpassed 15wt%, the mobile extreme difference of powder can not be measured.
Below analyze by table 1, Figure 13 and Figure 14.In the considerably less scope of the water content of steel-making dust (being lower than 0.5wt%), the powder flowbility of steel-making dust is good, and the fillibility in metal pattern is also fine, but the apparent density of pressure transmission when being shaped and briquetting is lower.It is believed that, this is because steel-making dust does not contain moisture, thereby between the powder and the friction between powder and the formation mould bigger, less and by the close filling effect that rearranges generation of powder, so the apparent density of briquetting B reduces owing to frictional dissipation causes the pressure-losses.
The water content of steel-making dust is in the scope of 0.5-1.5wt%, along with steel-making dust moisture increases, can obtain by the close filling effect that rearranges generation of powder and the effect of frictionloss minimizing, thereby cause the apparent density raising of briquetting B and the improvement of pressure transmission.
The water content of steel-making dust is in the scope of 1.5-15wt%, and pressure transmission is roughly certain value, this show by moisture produce reduce between powder and powder and shaping die between the effect of friction reach constant.The apparent density of briquetting raises slightly, and therefore the close filling effect that rearranges generation by powder increases.This is because the moisture increase has improved the result that powder rearranges effect.Though this is to be suitable for obtaining practical briquetting intensity and water content ranges, the fillibility of steel-making dust in metal pattern worsens along with the increase of water content.
The water content of steel-making dust is in the 15-20wt% scope, though can keep practical briquetting intensity, but because moisture is superfluous a little, moisture enters between the powder, thereby reduce by the close filling effect that rearranges generation of powder, simultaneously, because briquetting B begins to show the behavior of approximate liquid, thereby the pressure transmission raising.If do not adopt the method with power of enforcement, filling steel-making dust in shaping die will encounter difficulties.
During the scope of the water content of steel-making dust more than 20wt%, briquetting B becomes the mud shape, can not play its effect.Moisture enters between the powder in a large number, and is by the close filling effect forfeiture that rearranges generation of powder, dominant by the combination that the surface tension of water produces.Briquetting shows the behavior of approximate liquid during shaping, thereby the pressure-losses reduces.
The water content ranges that can obtain the steel-making dust of practical briquetting intensity is 0.5-20wt%, preferably 1.5-15wt%.This be because, water content is when 1.5wt% or 1.5wt% are above, the briquetting intensity stabilization is operated easily, water content is shaped and carries out easily in 15wt% or the following scope of 15wt%.
In test, be to use the steel-making dust of discharging to make briquetting by electric furnace, in fact, the steel-making dust that uses in this embodiment, so long as produce produce in the iron and steel process, main component is that the steel-making dust of iron and oxide compound thereof gets final product, and also can use the dust that produces in converter, blast furnace or other process for making process.In addition, in the occasion of adding various metals and oxide compound thereof, carbon, inorganics etc. as required, as long as these additives are powder and its addition plasticity obviously not being influenced, also can be the mix steel making dust that adds these additives.
The producing apparatus of the steel-making dust cured article of Figure 11, owing to equipped water ratio setting device 19, thereby can adjust the water content of steel-making dust 11 easily.
In addition, the metal part branch that the steel-making dust that contains moisture can promote to comprise the device of shaping die 7 gets rusty, and the anti-locking apparatus of therefore must taking measures gets rusty.Particularly be difficult to use the shaping die part of slushing oil, take rust preventing very important, wherein, the inside diameter of the former 7a that directly contacts with briquetting B and plunger 12 antirust most important.The rust preventing of former 7a preferably, material or coating that rust resistance is good are used for shaping die.Material in the shaping die 7 of present embodiment is that the former of SKH51 in use gets rusty, thereby can not use.This is because the steel-making dust that contains moisture has the effect that promotion is got rusty attached on the metal pattern.The SKD11 that handles through hard chrome plating does not get rusty, and can continue to use.What use in this embodiment is hard chrome plating, in fact, so long as have the good material of function, the rust resistance of shaping die 7 and coating can be used.Such material for example can be enumerated Wimet, sintering metal, pottery and stainless steel etc., and the example of coating can be enumerated nitride and carbide, the DLC (carbon of diamond lattic structure) etc. of chromium plating, nickel plating, chromium or titanium.
For the supply powder part of solidification equipment, because the cause of water content makes the fillibility (flowing into the characteristic in the shaping die) of steel-making dust go wrong, thereby preferably setting has the to a certain degree pressure filling mechanism 30 of power of enforcement.
The direction of shaping die has no particular limits, as above-mentioned pressure filling mechanism 30, be occasion longitudinally in the shaping die direction, can use for the powder machine with mechanisms such as screw rod extrusion, in the shaping die direction is horizontal occasion, can use by mechanisms such as screw rod extrusion.
The following describes the 3rd embodiment of the present invention.As shown in figure 17, the 3rd embodiment is different with the 1st embodiment, and except the feed path of steel-making dust 11, also supplying with carbon to hopper 5 in addition is the powder C of main component, these steel-making dusts 11 and powder C are mixed in hopper 5, form powdered mixture 11c.
Hopper 5 has the feed mechanism of distribution (not shown), and steel-making dust 11 and main component are that the powdered mixture 11c of the powder C of carbon is assigned with, drops in a plurality of curing mechanisms that are set up in parallel 6 of steel-making dust cured article producing apparatus 4.Curing mechanism 6 is that the above-mentioned powdered mixture 11c as raw material is solidified into the mechanism that presses blocky steel-making dust cured article (briquetting) B, and it is equipped with shaping die 7.
In hopper 5 or curing mechanism portion 6, be provided with the pressure filling mechanism 30 that will be filled into by the powdered mixture 11c pressure that hopper 5 is supplied with in the shaping die 7, other structure is identical with the 1st embodiment.
The following describes that the steel-making dust cured article producing apparatus 4 (Figure 17) that uses this embodiment is made the method for briquetting (steel-making dust cured article) B and the briquetting B that makes utilize method.Producing in smelting furnace 1 and be admitted in the hopper 5 by the steel-making dust 9 of discharging after forming powder in the particle collector 3, is that the powder 10 of carbon mixes with main component in other approach feeding hopper 5 in hopper 5.The main component of steel-making dust 9 is iron and oxide compound thereof.With carbon is the amount of the powder 10 of main component, is that above-mentioned shaping raw material is the 1-40wt% of powdered mixture 11.Shaping raw material 11 in the hopper 5 is fed in the shaping die 7 of curing mechanism portion 6.
In curing mechanism 6, by hopper 5 in shaping die 7, send into specified amount, steel-making dust 9 be the mixed powder 11 of the powder 10 of main component with carbon, then, plunger 12 enters in the shaping die 7 by the driving of pressurizing device 13.Under this state, the powdered mixture in the shaping die 7 11 is applied the pressure of regulation.At this moment, for pressurization area of section (being the area of section of plunger 12) x (mm 2) apply shaping pressure P (MPa), make it to reach setting range.The briquetting B that makes like this is identical with the 1st embodiment, and its profile is right cylinder (as shown in Figure 3), and it is used as steelmaking feed again.
When adopting the manufacture method of briquetting B of this embodiment, the raw material 11 of shaping die 7 of packing into is the mixture of the powder 10 of main component for steel-making dust 9 with carbon, the amount that with carbon is the powder 10 of main component is the 1-40wt% as raw material 11, carry out press molding, thereby do not need to add tackiness agent etc. and just can make the briquetting B that has sufficient intensity in the practicality.The following describes its mechanism.
In the curing of briquetting B, do not use tackiness agent etc. to improve the occasion of the additive of molding intensity, the solidification of briquetting B is that the powder particle that causes during by press molding rearranges with the sticking power that contacts generation and shows.By contrast, be the occasion of the material of main component mixing carbon dust etc. with carbon because the activity on carbon dust surface is lower, by powder to each other sticking power and the briquetting intensity that produces may reduce.Therefore, by adding tackiness agent, utilizing the bonding strength of tackiness agent to strengthen briquetting intensity is highly effective, do not use tackiness agent, easy and method that cost is low fully but the objective of the invention is to develop, must in the raw material powder of supplying with, not add as far as possible under the situation of tackiness agent and obtain being enough to satisfy the practical briquetting intensity that requires.
For this reason, the inventor has carried out various investigation and experimental verification for the steel-making dust that has added carbon dust etc., found that, the carbon dust amount of adding does not use reinforcer such as tackiness agent can obtain being enough to satisfy the briquetting intensity of practical requirement when the powdered mixture 40wt% of steel-making dust and carbon dust or 40wt% are following yet.
In order to investigate the plasticity of above-mentioned powdered mixture, same with the 1st embodiment, the inventor uses the shaping die of Fig. 4 to carry out cure test.Employed steel-making dust is the steel-making dust of discharging from electric furnace, and its apparent density is 1.4-1.8g/cm 3, the apparent density of the carbon dust of use is 0.75g/cm 3In this cure test, change the various blending ratios of steel-making dust and carbon dust, make various raw materials (powdered mixture), experimentize.The water content of raw material powder is between the 3-8%.
Shown in the table 2 be, change the addition and the compacting pressure of carbon dust, make diameter phi 70mm, height and diameter ratio and be 80% cylindrical briquetting B and make it to become the apparent density measurement result of the briquetting B of complete drying state.
The apparent density of table 2 compacting pressure, carbon addition and briquetting
Carbon addition (wt%)
0 2 5 10 15 20 25 30 35 40 45
(M P a) for forming pressure 5 2.35 2.32 2.28 2.21 2.14 2.08 2.01 1.95 1.89 1.82 -
10 2.49 2.46 2.42 2.35 2.28 2.21 2.13 2.06 1.99 1.92 -
25 2.65 2.61 2.57 2.50 2.43 2.35 2.27 2.19 2.12 2.05 -
50 2.85 2.81 2.77 2.68 2.60 2.52 2.44 2.36 2.28 2.20 -
75 2.98 2.95 2.90 2.81 2.72 2.64 2.55 2.47 2.38 2.30 -
100 3.15 3.10 3.06 2.97 2.88 2.79 2.73 2.67 2.55 2.43 -
150 3.32 3.30 3.23 3.13 3.04 2.94 2.84 2.75 2.66 2.56 -
200 - - - - - - - - - -
1) apparent density of briquetting is the value of complete drying state
2) "-" in the table represents to be shaped (generation layering)
By this measurement result as can be seen:
Irrelevant with the addition of carbon dust, can keep the minimum compacting pressure of shape as briquetting B is 5MPa, when compacting pressure is lower than this value, can not keep the briquetting intensity that can operate.On the other hand, the highest compacting pressure is 150MPa, when compacting pressure is higher than this value, generation is called as stratiform be full of cracks stratified and compacting pressure direction vertical direction, and breakage takes place briquetting B during the demoulding, under the identical condition of carbon dust addition, the briquetting apparent density increases along with the increase of compacting pressure, under identical compacting pressure, the addition of carbon dust is many more, and apparent density is more little.The carbon dust addition that can obtain the briquetting intensity that can operate is 40wt% or below the 40wt%, the carbon dust addition surpass 40wt% interpolation the briquetting B of carbon dust, briquetting itself is defeated and dispersed easily, can not carry out manipulation.The apparent density of briquetting B in the scope of the compacting pressure that can keep the briquetting intensity that can operate and carbon dust addition is 1.8-3.3g/cm 3
For the influence of investigation interpolation carbon dust in more detail, carried out the dropping strength test for the briquetting B that under certain compacting pressure, makes.The dropping strength test-results of the briquetting B that Figure 18 is illustrated in and is configured as diameter phi 70mm, height and diameter ratio under the 75MPa compacting pressure when being 80% cylindrical briquetting B.The carbon dust addition is when 25wt% or 25wt% are following, and the intensity of briquetting roughly keeps certain level.When the carbon dust addition surpassed 25wt%, along with the carbon dust addition increases, briquetting intensity reduced, when the carbon dust amount surpasses 40wt%, briquetting B substantial loss shape-retentivity.Therefore, can obtain the practical carbon dust amount that enough briquetting intensity is 40wt% or below the 40wt%.
Compare with the monomeric briquetting of the steel-making dust of identical molding condition, behind the interpolation carbon dust, all powder sticking power to each other reduces, thereby the intensity of briquetting might reduce.But, owing to the apparent density of briquetting itself along with the carbon dust addition reduces, thereby consider from the angle of dropping strength, briquetting intensity reduces little, by Figure 18 also as can be seen, the carbon dust addition can obtain the dropping strength identical substantially with the steel-making dust briquetting intensity of carbonaceous powder not when 25wt% or the following scope of 25wt%.But the carbon dust addition is worth when above at this, and the effect that carbon dust sticking power to each other reduces increases, and briquetting intensity reduces.The addition of carbon dust is advisable in the 1-40wt% scope.When addition is higher than 40wt%, be difficult to obtain being enough to satisfy the practical briquetting intensity that requires, when addition is lower than 1wt%,, can't realize improving the purpose of this interpolation carbon dust of furnace thermal efficiency though the intensity of briquetting is no problem.It is therefore preferable that the carbon dust addition is the scope of 2-25wt%.This is because when the addition of carbon dust was up to 25wt%, the dropping strength of briquetting B can not reduce, and when addition is 2-25wt%, improved the effect maximum of furnace thermal efficiency.
If consider above-mentioned carbon dust addition and the shape pressure that can be solidified into, under the complete drying state, the apparent density scope of the briquetting B that can operate is 1.8-3.3g/cm 3The apparent density of the complete drying state of the briquetting B of carbon dust addition in preferred range is the 2-25wt% scope is 2.0-3.3g/cm 3
In above-mentioned test, be to use the steel-making dust of discharging to make briquetting by electric furnace, but, the dust that uses in this embodiment also can use the dust that produces in converter, blast furnace or other process for making process so long as to produce the main component that produces in the iron and steel process be that the dust of iron and oxide compound thereof gets final product.In addition, be the material of main component with carbon, except the carbon dust described in the embodiment, can also use graphite and fine coal etc.
In the producing apparatus 4 of the steel-making dust cured article of Figure 17, for curing mechanism 6 for the powder part because the cause of water content, the fillibility of powdered mixture 11 (characteristic of injection molding mould 7) existing problems.Therefore, same with the 2nd embodiment, the pressure filling mechanism 30 of above-mentioned mechanism that is pressed into for the powder machine or by screw rod with power of enforcement to a certain degree and so on preferably is set.
The following describes the 4th embodiment of the present invention.As shown in figure 19, different with the 1st embodiment, the 4th embodiment has 2 hoppers, and the steel-making dust 11 that drops into the 1st hopper 5A is supplied to prilling granulator 19.Prilling granulator 19 is made granulation body 11p with pulverous steel-making dust 11.For example, prilling granulator 19 adds an amount of moisture in powder in the cylinder (not shown) of rotation, makes it aggegation and forms globular granulation body.Granulation body 11p for example particle diameter is 5-15mm, and water ratio is 0.5-15wt%.The granulation body 11p that forms the steel-making dust 11 of granulation in prilling granulator 19 is dropped among the 2nd hopper 5B.In addition, also can omit the 1st hopper 5A, in the process of carrying, carry out the granulation of steel-making dust 11 with above-mentioned e Foerderanlage.
Hopper 5B has the feedway of distribution (not shown), and the granulation body 11p of steel-making dust 11 is assigned with, drops in a plurality of curing mechanisms that are set up in parallel 6 of steel-making dust cured article producing apparatus 4.Curing mechanism 6 is the mechanisms that the granulation body 11p of steel-making dust 11 are solidified into pressure blocky steel-making dust cured article (briquetting) B, and it has shaping die 7.
In hopper 5 or curing mechanism 6, the pressure filling mechanism 30 that will be filled into by steel-making dust 11 pressures that hopper 5 is supplied with in the shaping die 7 is set.Other structure and the 1st
Embodiment is identical.
The producing apparatus 4 (Figure 19) that the following describes the steel-making dust cured article that uses the 2nd embodiment make the method for briquetting (steel-making dust cured article) B and the briquetting B that makes utilize method.To produce in smelting furnace 1 and be dropped among the 1st hopper 5A by the steel-making dust 11 of discharging after forming powder in the particle collector 3, the main component of this Powdered steel-making dust 11 is iron and oxide compound thereof.The steel-making dust 11 that is dropped into hopper 5A forms granulation body 11p in prilling granulator 19, dropped among the 2nd hopper 5B, is supplied to by hopper 5B in the shaping die 7 of curing mechanism 6.
In curing mechanism 6, in shaping die 7, send into the granulation body 11p of the steel-making dust 11 of specified amount by hopper 5B, then, plunger 12 enters in the shaping die 7 by the driving of pressurizing device 13.Under this state, the steel-making dust 11 in the shaping die 7 is applied the pressure of regulation.At this moment, for pressurization area of section (being the area of section of plunger 12) x (mm 2) apply shaping pressure P (MPa) and make it to reach specialized range.
Briquetting B and the 1st embodiment made like this are same, and its profile is the cylinder bodily form as shown in Figure 3, have the ratio (H/D) of the diameter D of regulation and height H and diameter D, are used as steelmaking feed and reuse.
Adopt the manufacture method of the briquetting B of this embodiment, owing to use prilling granulator 19 that steel-making dust 11 is formed granulation body 11p, under the state of this granulation body 11p, utilize shaping die 7 to carry out press molding, thereby do not need to add tackiness agent etc. and just can make the briquetting that has sufficient intensity in the practicality.The following describes its mechanism.
In the solidification process of briquetting B, do not use tackiness agent etc. to improve the occasion of the additive of molding intensity, the solidification of briquetting B be the powder particle that causes during by press molding rearrange and since the sticking power that contact produces embody.In general, the contact area between powder is big more, and the sticking power of powder is strong more, thereby as long as improve compacting pressure, increases the contact area between powder, and the intensity of briquetting B will improve.
But, since powder particle can not resemble freely change between its position and the powder the liquid and powder and formation mould surface between produce frictional force, insufficient during compression molding by the close filling effect that rearranges generation of powder, inside comprises very big void volume, perhaps because frictionloss causes the compacting pressure heterogeneity, at the bigger density difference of the inner generation of molding, thereby strengthen compacting pressure and may not necessarily improve fabrication strength.In addition, residual air in the molding internal voids and density difference, also be when removing compacting pressure and carry out the demoulding, lower compacting pressure scope, with the vertical direction of compacting pressure direction on produce the stratified major cause of stratiform be full of cracks.
For space and the shaping density difference that is reduced to body inside by compacting pressure, adding flowability and the shaping die fillibility that tackiness agent improves powder particle is effective means, does not use tackiness agent, easy and method that cost is low fully but the objective of the invention is to develop.
Owing to above reason, the contact area (improving shaping density) that increases between powder by compacting pressure is limited with the intensity that improves briquetting B.Therefore the inventor explores the method that improves shaping density by other approach, various investigation and experimental verification have been carried out, found that, under identical molding condition, be that raw material obtain higher shaping density as raw material ratio with Powdered steel-making dust with the steel-making dust of granulation.
In the process of producing iron and steel; for example in smelting furnace; after being blowed the iron of fine particle shape upwards and ferric oxide and in particle collector, being recovered,, generally be to carry out granulation with tablets press for this steel-making dust for example being made the dust granules described in the above-mentioned patent documentation 1 as dust.Present embodiment is by using this raw material through granulation that it is configured as briquetting, even do not use reinforcer such as tackiness agent also can obtain the practical enough briquetting intensity that.
The inventor uses the shaping die of Fig. 4 to carry out cure test in order to investigate the plasticity of steel-making dust with the 1st embodiment equally.Employed steel-making dust is a dust of discharging and pass through granulation from electric furnace, and its particle diameter is 5-15mm.Object as a comparison uses the powder of the steel-making dust of discharging from same electric furnace.
Shown in the table 3 be, use the granulation body and the powder of water ratio 5% to be raw material, changing compacting pressure, to make diameter phi 70mm, height and diameter ratio be 80% cylindrical briquetting B, the result of the apparent density of the briquetting B under the complete drying state and the test of the dropping strength of briquetting B.
Table 4 is results that the apparent density with the apparent density of granulation body and powder compares.
Whether table 3 raw material granulation and briquetting apparent density and the test of briquetting dropping strength
Compacting pressure (MPa) Apparent density (g/cm 3) Shatter test
10cm 30cm 50cm 70cm 90cm
25 2.51 ○ ○ ×
3.12 ○ ○ ○ ×
50 2.71 ○ ○ ○ ×
3.25 ○ ○ ○ ○ ×
75 2.83 ○ ○ ○ ×
3.37 ○ ○ ○ ○ ○
100 2.95 ○ ○ ○ ×
3.48 ○ ○ ○ ○ ○
150 3.04 ○ ○ ○ ○ ×
3.55 ○ ○ ○ ○ ○
200 Layering - - - - -
3.61 ○ ○ ○ ○ ○
300 Layering - - - - -
3.65 ○ ○ ○ ○ ○
400 Layering - - - - -
Layering - - - - -
The top of ※ 1 each compacting pressure is the value of powder stock, and the bottom is the value of granulating raw material
The apparent density of ※ 2 briquettings is values of complete drying state
In ※ 3 shatter tests zero expression keeps shape, and * expression is damaged
The apparent density of table 4 granulation body and the apparent density of powder
The apparent density of powder 1.4～1.8g/cm 3
The apparent density of granulation body 3.0～3.9g/cm 3
The apparent density of ※ 1 powder is to measure according to slightly knocking loading level
The apparent density of ※ 2 granulation bodies is by size and weight determination
※ 3 all is the value that is converted under the complete drying state
Under arbitrary compacting pressure, compare with powder stock, being that apparent density and the dropping strength of the briquetting B of raw material all wants big through the granulation body of granulation, and be that the performance of the briquetting B of raw material will be got well with the granulation body of granulation, comparing under the condition of same intensity, is that the briquetting B of raw material can solidify under lower compacting pressure with the granulation body.In addition, producing stratified compacting pressure also is to want high when being raw material with the granulation body.
Described granulation, be in the cylinder of rotation, in powder, to add an amount of moisture to make it aggegation and form globular granulation body, the apparent density of the granulation body of making in this way is than the shaping density height of the molding that uses the powder stock press molding to obtain, and, do not need the power of enforcement that adds, only just can realize keeping shape, so not have internal stress such as density difference in the granulation body basically by cohesive force.When using such raw material to carry out press molding, inner at shaping die because the viscous deformation behavior of granulation body, the apparent density loss of granulation body is little, in the shape of shaping die internal strain for regulation, form the shape of briquetting B, compare with the molding that under identical molding condition, the powder stock press molding is obtained and obtain high apparent density.As for layering, short ofly reach the compacting pressure of seeing the scope of density above the granulation body surface, because the increase of the springback capacity that residual air in the space and shaping density difference produce just can not be very big.As a result, producing stratified compacting pressure has improved with the occasion of powder stock press molding is compared.
What Figure 20 represented is, uses the granulation body of control water ratio, makes diameter phi 70 under the 50MPa compacting pressure, the briquetting apparent density of the complete drying state when height and diameter ratio are 80% cylindrical briquetting.When water content is lower than 0.5wt%, have after the shaping among the briquetting B to crack, the mensuration of apparent density can't be carried out.Water content is when 0.5wt% or 0.5wt% are above, and the shaping of briquetting B can be carried out, and water content apparent density in the 1.5-10wt% scope is roughly certain.When water ratio surpassed 10wt%, the apparent density of briquetting B reduced slightly.When the water ratio of granulation body surpasses 15wt%, the softening mud shape that forms of granulation body, test can not be carried out.
By the result of the foregoing description as can be known, when the granulation body of granulation showed the viscous deformation behavior in shaping die, moisture had the friction that reduces between powder, the effect that distortion is carried out easily.This water content 0.5wt% or the 0.5wt% of acting on shows when above, surpasses the more scope of amount of moisture of 10wt% in water content, and moisture itself produces the fluidic behavior, thereby effect is run counter to desire for the apparent density of raising briquetting B.The water content ranges of granulation body of steel-making dust that can obtain the intensity of practical briquetting B is 0.5-15wt%, preferably 1.5-10wt%.
Be to use in test the steel-making dust of discharging to make briquetting by electric furnace, but in fact, the dust that uses in the present embodiment also can use the dust that produces so long as to produce the main component that produces in the process of iron and steel be that the dust of iron and oxide compound thereof gets final product in converter, blast furnace or other process for making process.In addition,, plasticity is not obviously influenced, can add the powdered mixture of these additives yet as long as additive is powder and its addition in the occasion of adding various metals and oxide compound thereof, carbon, inorganics etc. as required.
In the producing apparatus of the steel-making dust cured article of Figure 19, confession powder part for curing mechanism 6, because the fillibility of the cause steel-making dust granulation body 11p of water content (flowing into the characteristic of shaping die) existing problems, thereby same with the 2nd embodiment, have a power of enforcement to a certain degree above-mentioned for the powder machine or be pressed into etc. the pressure tamping unit 30 of mechanism and so on by screw rod preferably is set.
The following describes the 5th embodiment of the present invention, as shown in figure 21, the 5th embodiment is different with the 4th embodiment, and the 1st hopper 5A has steel-making dust accommodation section 5Aa and carbon dust accommodation section 5Ab, and steel-making dust 11 is dropped among the steel-making dust accommodation section 5Aa.Being dropped into carbon in the 5Ab of carbon dust accommodation section by the path different with steel-making dust 11 is the powder (not shown) of main component.Described is that the powder of main component is not limited to pure carbon dust with carbon, also can be graphite.
The 1st hopper 5A have by preset proportion with the steel-making dust 11 of steel-making dust accommodation section 5Aa and carbon dust accommodation section 5Ab be the mixing device 35 of the powder mixes of main component with carbon, mixing device 35 for example constitutes by mixing teeter column and worm conveyor or agitating vane etc.
By effusive steel-making dust of the 1st hopper 5A 11 and main component is that the powdered mixture of powder is supplied to prilling granulator 19.Prilling granulator 19 is the devices that above-mentioned powdered mixture granulation formed granulation body 11p.This granulation body 11p is an above-mentioned dust 11 and be the mixing granulation body of the powder of main component with carbon.Prilling granulator 19 for example adds an amount of moisture in powder in the cylinder (not shown) of rotation makes it aggegation and becomes globular granulation body.Granulation body 11p for example particle diameter is 5-15mm, and water ratio is 0.5-15wt%.Granulation body 11p by the steel-making dust 11 of prilling granulator 19 granulations is dropped among the 2nd hopper 5B.
In addition, also can save the 1st hopper 5A, in the process of carrying, carry out the granulation of steel-making dust 11 with above-mentioned e Foerderanlage.
Hopper 5B has the distribution device (not shown), and the granulation body 11p of steel-making dust 11 is assigned with, drops in a plurality of curing mechanisms that are set up in parallel 6 of steel-making dust cured article producing apparatus 4.Curing mechanism 6 is the mechanisms that the granulation body 11p of steel-making dust 11 are solidified into pressure blocky steel-making dust cured article (briquetting) B, and it is equipped with shaping die 7.Other structure is identical with the 4th embodiment.
In the 5th embodiment, preferably, in the shaping die 7 of Fig. 2 and the plunger 12, the surface that contacts with steel-making dust 11 when being shaped at least uses the corrosion resistant material.The corrosion resistant material is preferentially selected the material of selecting more than a kind or a kind for use from Wimet, sintering metal, pottery and stainless steel.
Replace shaping die 7 and 12 schemes of plunger as the corrosion resistant material, also can be as shown in figure 16, shaping die 7 and plunger 12 at least with surface that steel-making dust 11 contact on formation rust stable overlay film 31,32 and 33.Described rust stable overlay film 31-33, can use in the carbon of the carbide of nitride, titanium of carbide, the titanium of the nitride that is selected from chromium plating, nickel plating, chromium, chromium and diamond lattic structure more than at least a kind or a kind.
The following describes that the steel-making dust cured article producing apparatus 4 (Figure 21) that uses this embodiment is made the method for briquetting (steel-making dust cured article) B and the briquetting B that makes utilize method.Produce in smelting furnace 1 and be admitted among the 1st hopper 5A by the steel-making dust 11 of discharging after forming powder in the particle collector 3, the main component of this Powdered steel-making dust 11 is iron and oxide compound thereof.Drop among the hopper 5A steel-making dust 11 in prilling granulator 19, forms granulation body 11p, dropped among the 2nd hopper 5B then, in the shaping die 7 by this hopper 5B supply curing mechanism 6.
In curing mechanism 6, in shaping die 7, send into granulation body 11p specified amount, steel-making dust 11 by hopper 5B, then, plunger 12 enters in the shaping die 7 by the driving of pressurizing device 13.Under this state, the steel-making dust in the shaping die 7 11 is applied the pressure of regulation.At this moment, for pressurization area of section (being the area of section of plunger 12) x (mm 2) apply shaping pressure P (MPa), make it to reach setting range.
The briquetting B that makes like this, identical with the 4th embodiment in the occasion of cylinder metal pattern, its profile is the cylinder bodily form as shown in Figure 3, has the ratio (H/D) of the diameter D of regulation and height H and diameter D, is used as steelmaking feed and utilizes.
When adopting the manufacture method of briquetting B of this embodiment, use above-mentioned steel-making dust 11 and be the powder mixes of main component, the mixing granulation body 11p that granulation forms as the raw material of the shaping die of packing into carbon, thereby, need in the raw material dust of supplying with 11, not add additive as far as possible and just can make the improved briquetting B of furnace thermal efficiency when having sufficient intensity in the practicality and reloading in the stove.In addition, can make this briquetting B with low cost.The following describes its mechanism.
In order to investigate the plasticity of steel-making dust, same with the 4th embodiment, the inventor uses the shaping die of Fig. 4 to carry out cure test.Briquetting B at the steel-making dust of the recycling that is used for electric furnace etc. adds carbon materials such as carbon dust, for the thermo-efficiency that improves electric furnace is very important, this be because, the carbon dust that adds is with steel-making dust reductive spontaneous combustion simultaneously heating, thereby can reduce the energy of importing by the outside, improve the thermo-efficiency of stove greatly.Therefore, the briquetting B that has added carbon dust is highly effective measure for the recycling of steel-making dust.
In the solidification process of briquetting B, do not use tackiness agent etc. to improve the occasion of the additive of molding intensity, the solidification of briquetting be the powder particle that causes during by press molding rearrange and since the sticking power that contact produces embody.In general, the contact area between powder is big more, and the sticking power of powder is strong more, thereby as long as improve compacting pressure, increases the contact area between powder, and the intensity of briquetting will improve.But, since powder particle can not resemble freely change between its position and the powder the liquid and powder and formation mould surface between produce frictional force, insufficient during compression molding by the close filling effect that rearranges generation of powder, inside comprises very big void volume, perhaps because frictionloss causes the compacting pressure heterogeneity, at the bigger density difference of the inner generation of molding, thereby strengthen compacting pressure and may not necessarily improve fabrication strength.In addition, residual air in the molding internal voids and density difference, also be when removing compacting pressure and carry out the demoulding, lower compacting pressure scope, with the vertical direction of compacting pressure direction on produce the stratified major cause of stratiform be full of cracks.
Above described be problem in the general powder forming process, be the occasion of the material of main component mixing carbon dust etc. with carbon, also may produce bigger problem.The surfactivity of carbon dust is low, therefore above-mentioned sticking power a little less than.In addition, the apparent density of small carbon dust is less, and the result when steel-making dust raw material that has mixed carbon dust is filled in the forming metal mould, has bigger void volume.Usually, volume through space after the shaping operation reduces, to a certain extent residual air being discharged simultaneously, still, is the occasion of raw material at the steel-making dust that has mixed carbon dust, not only the void volume during the filler metal mould is big, and have initial stage after the beginning that is shaped, the residual air that is contained in this space is closed and the characteristic that is difficult to discharge, the result, the briquetting B that residual air is compressed produces very big resilience on the shaping direction, produce layering from the low pressure shaped region.
For space and the shaping density difference that is reduced to body inside by compacting pressure, it is highly effective adding that tackiness agent improves the flowability and the metal pattern fillibility of powder particle and utilize the cohesive strength of tackiness agent to increase briquetting intensity, do not use the easy of tackiness agent and method that cost is low fully but the objective of the invention is to develop, must in the raw material powder of supplying with, not add as far as possible under the situation of additive and obtain enough briquetting intensity in the practicality.
For this reason; the inventor has carried out various investigation and experimental verification for the steel-making dust that adds carbon dust etc.; found that; carbon materialses such as carbon dust are added in the tablets press with the steel-making dust granulation; with the steel-making dust granulation; make the mixing granulation body, use this granulation body to form and make briquetting, can eliminate the disadvantageous effect that produces for plasticity in the occasion of adding carbon dust.In the steel-making field, there are a lot of occasions steel-making dust for example need be made the dust granules described in the above-mentioned patent documentation 1 and generally are to use the tablets press granulation.
The present invention adds carbon material such as carbon dust to carry out granulation in above-mentioned habitual granulating working procedure, it is used as the raw material of making briquetting, even therefore do not use reinforcer such as tackiness agent also can obtain the practical enough briquetting intensity that.
As embodiment, use the metal pattern of the manufacturing round shape briquetting B that constitutes by cylinder female part shown in Figure 4 and drift to carry out cure test.
The SKD11 that the material of test metal pattern uses SKH51 and handles through hard chrome plating.Employed steel-making dust is the dust of discharging from electric furnace, prepares 4 kinds of samples.These 4 kinds of samples are respectively: the sample of mixing granulation (granulation diameter 5-15mm) in prilling granulator with steel-making dust and carbon dust (weight ratio 4: 1); Only use steel-making dust granulation (granulation diameter 5-15mm), the granulation body and the carbon dust of this steel-making dust are pressed 4: 1 weight ratio blended sample; With steel-making dust and carbon dust with pulverulence, by 4: 1 weight ratio blended samples; And the powdered sample that has only steel-making dust as a comparative example.
Shown in the table 5 be, the above-mentioned 4 kinds of samples that use water ratio 5% as raw material, change the cylindrical briquetting B that compacting pressure is made diameter phi 70, height and diameter ratio 80%, the result of the apparent density of the briquetting B under the complete drying state and the test of briquetting dropping strength.The mixing granulation sample of steel-making dust and carbon dust keeps shape under the compacting pressure of 5-150MPa, the compacting pressure scope with 50cm or the above dropping strength of 50cm is that 50MPa or 50MPa are above, 150MPa or below the 150MPa.
The dropping strength test of the state of table 5 raw material and briquetting apparent density and briquetting
Compacting pressure (MPa) Raw material powder Apparent density (g/cm 3) Shatter test
10cm 30cm 50cm 70cm 90cm
5 ① 1.98 ×
② Layering - - - - -
③ Layering - - - - -
④ 2.25 ×
10 ① 2.06 ○ ×
② Layering - - - - -
③ Layering - - - - -
④ 2.34 ○ ×
25 ① 2.2 ○ ○ ×
② Layering - - - - -
③ Layering - - - - -
④ 2.51 ○ ○ ×
50 ① 2.38 ○ ○ ○ ×
② Layering - - - - -
③ Layering - - - - -
④ 2.71 ○ ○ ○ ×
75 ① 2.49 ○ ○ ○ ×
② Layering - - - - -
③ Layering - - - - -
④ 2.83
100 ① 2.59 ○ ○ ○ ×
② Layering - - - - -
③ Layering - - - - -
④ 2.95 ○ ○ ○ ×
150 ① 2.67 ○ ○ ○ ○ ×
② Layering - - - - -
③ Layering - - - - -
④ 3.04 ○ ○ ○ ○ ×
200 ① Layering - - - - -
② Layering - - - - -
③ Layering - - - - -
④ Layering - - - - -
1.-4. numbering in ※ 1 table represents sample
1. limit mixing, limit granulation (particle diameter 5-15mm) in tablets press with steel-making dust and carbon (weight ratio 4: 1)
2. have only the steel-making dust granulation, its granulation body is mixed by 4: 1 weight ratio with carbon
3. steel-making dust and the carbon with pulverulence mixes by 4: 1 weight ratio
4. the independent powder of steel-making dust
The apparent density of ※ 2 briquettings is the values under the complete drying state
In ※ 3 shatter tests zero expression keeps shape, and * expression is damaged
Only with the steel-making dust granulation, with this steel-making dust granulation body and carbon dust by 4: 1 weight ratio blended sample and with steel-making dust and carbon dust with pulverulence, by 4: 1 weight ratio blended samples, layering takes place in the scope of whole compacting pressures of testing, can not conformal.Only contain the powdered sample of steel-making dust and the mixing granulation sample of steel-making dust and carbon dust, briquetting intensity is identical substantially.
Granulation is to add an amount of moisture to make it aggegation formation globular particle in the cylinder of rotation in powder, the apparent density of the granulation body of making in this way is than the shaping density height of the molding that the powder stock press molding is obtained, this is the surface tension owing to moisture, has reduced the cause in gap when powder is attached to each other to greatest extent.Because this effect that is to say the carbon dust that apparent density is less even have big void space in the powder packing volume, the granulation body also can densification during granulation.
When using such raw material to carry out press molding, in forming metal mould inside, because the viscous deformation behavior of granulation body, the apparent density loss of granulation body is little, in shaping die, be deformed into the shape of regulation, form the shape of briquetting B, to compare residual air few with the carbon dust that does not carry out granulation, thereby can not take place at least because the layering that residual air causes.Monomeric briquetting B compares with the steel-making dust of the same terms, add behind the carbon dust because all powder sticking power each other reduces, briquetting intensity may reduce, but the apparent density of briquetting B itself reduces owing to the carbon dust addition, consider to reduce little from the dropping strength angle, as shown in the table 5, resulting dropping strength is identical substantially with the steel-making dust briquetting intensity of carbonaceous powder not.
What Figure 22 represented is; with steel-making dust and carbon dust (weight ratio 4: the 1) water ratio that mix in tablets press on the limit, the limit changes institute's granulation sample, the briquetting apparent density of the complete drying state when using the granulation body that obtains to make diameter phi 70, height and diameter ratio being 80% cylindrical briquetting with the compacting pressure of 50MPa.When water content is lower than 0.5wt%, have in the briquetting after the shaping to crack, the mensuration of apparent density can't be carried out.Water content is when 0.5wt% or 0.5wt% are above, and the shaping of briquetting can be carried out, and water content apparent density in the 1.5-10wt% scope is roughly certain.When water ratio surpassed 10wt%, the apparent density of briquetting B slightly reduced.The water ratio of granulation body when 15wt% or 15wt% are above, the softening mud shape that forms of granulation body, test can not be carried out.
By the result of the foregoing description as can be known, when the granulation body showed the viscous deformation behavior in shaping die, moisture had the friction that reduces between powder, the effect that distortion is carried out easily.This water content 0.5wt% or the 0.5wt% of acting on shows when above, surpasses the more scope of amount of moisture of 10wt% in water content, and moisture itself shows as the behavior of liquid, thereby effect is run counter to desire for the apparent density that improves briquetting B.Can obtain practical briquetting intensity, the water content ranges of the sample of mixing granulation in prilling granulator is 0.5-15wt% with steel-making dust and carbon dust (weight ratio 4: 1), 1.5-10wt% preferably.
Be to use in test the steel-making dust of discharging to make briquetting B by electric furnace, in fact, the dust that uses in the present embodiment also can use the dust that produces so long as to produce the main component that produces in the process of iron and steel be that the dust of iron and oxide compound thereof gets final product in converter, blast furnace or other process for making process.In addition, be the material of main component with carbon, except the carbon dust described in the embodiment, can also use graphite and fines.
In order to adjust the water content of steel-making dust 11, preferably in curing mechanism 6 or path, water ratio regulating mechanism 36 is set with steel-making dust 11 supply curing mechanisms 6.Water ratio setting device 26 for example also can be arranged among the 1st hopper 5A or the 2nd hopper 5B.Water ratio setting device 36 can be used sprinkler system or drying installation.Sprinkler system can use sprinkler, divider etc., and drying installation can use heated oven, storage heater, gas blower etc.
The steel-making dust that contains moisture has the effect that the metal part branch of the device that promotes to comprise shaping die 7 gets rusty, thus the anti-locking apparatus that takes some countermeasures to get rusty be very necessary.Particularly be difficult to use the shaping die 7 of slushing oil, take rust preventing extremely important, wherein, the inside diameter of the former 7a that directly contacts with briquetting B and plunger 12,12A's is antirust main.In order to prevent that shaping die 7 from getting rusty, material that use rust resistance preferably as described above is good or the example of pressing Figure 16 use anti-rust film 31-33 such as coating on shaping die 7.
In the forming metal mould of this embodiment, material is that the shaping die of SKH51 in use gets rusty, and can not use.This is because the steel-making dust 11 that contains moisture has promoted to get rusty attached on the shaping die 7.The SKD11 that handles through hard chrome plating does not get rusty, and can continue to use.What use in an embodiment is hard chrome plating, but in fact, can use so long as have as the function and the good material or the coating of rust resistance of shaping die 7.
In the producing apparatus of the steel-making dust cured article of Figure 21, because the cause of water content, fillibility (characteristic of in shaping die 7, the injecting) existing problems of the steel-making dust granulation body 11p of the supply powder part of curing mechanism portion 6, therefore preferably same with the 4th embodiment, have a power of enforcement to a certain degree above-mentioned for the powder machine or be pressed into etc. the pressure tamping unit 30 of mechanism and so on by screw rod is set.

Claims (28)

1. pack into the cured article of press molding in the shaping die of steel-making dust cured article, the dust that this steel-making dust cured article produces producing in the iron and steel process, main component is iron and oxide compound thereof is characterized in that pressurization area of section x (mm 2) compacting pressure P (MPa) be the scope that is expressed from the next.
5≤P≤-96.785ln(x)+958.97
2. the described steel-making dust cured article of claim 1 is characterized in that profile is a cylindrical shape.
3. the described steel-making dust cured article of claim 2 is characterized in that cylindrical diameter is 30-100mm, and height is 30-150% with diameter ratio.
4. steel-making dust cured article, pack into the cured article of press molding in the shaping die of the dust that this steel-making dust cured article produces producing in the iron and steel process, main component is iron and oxide compound thereof, it is characterized in that its apparent density is 2.25-3.1g/cm under the state of complete drying 3
5. pack into the cured article of press molding in the shaping die of steel-making dust cured article, the dust that this steel-making dust cured article produces producing in the iron and steel process, main component is iron and oxide compound thereof is characterized in that the dust in the above-mentioned shaping die of packing into is the granulation body.
6. the described steel-making dust cured article of claim 5 is characterized in that the water ratio of described granulation body is 0.5-15wt%.
7. steel-making dust cured article, pack into the cured article of press molding in the shaping die of the steel-making dust that this steel-making dust cured article produces producing in the iron and steel process, main component is iron and oxide compound thereof, it is characterized in that, the raw material of above-mentioned shaping die of packing into is above-mentioned steel-making dust and be the mixture of the powder of main component with carbon, and described is that the amount of the powder of main component is the 1-40wt% of raw material with carbon.
8. the described steel-making dust cured article of claim 7 is characterized in that the apparent density of above-mentioned cured article is 1.8-3.3g/cm under the complete drying state 3
9. claim 7 or 8 described steel-making dust cured articles is characterized in that the powder that with carbon is main component is carbon dust or graphite.
10. the manufacture method of steel-making dust cured article, the dust that this method produces producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that, for pressurization area of section x (mm 2) compacting pressure P (MPa) be the scope that is expressed from the next.
5≤P≤-96.785ln(x)+958.97
11. the manufacture method of steel-making dust cured article, the dust that this method produces producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that, detect compacting pressure with pressure-detecting device, utilize this detected value to carry out the pressure that pressurized control makes it to reach regulation.
12. the manufacture method of steel-making dust cured article, the dust that this method produces producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that the water ratio of the dust of the above-mentioned shaping die of packing into is 0.5-20wt%.
13. the manufacture method of the described steel-making dust cured article of claim 12 is characterized in that, the rust stable material is used on surface above-mentioned shaping die and plunger, that contact with the steel-making dust cured article when being shaped at least.
14. the manufacture method of the described steel-making dust cured article of claim 13 is characterized in that, described corrosion resistant material is the material more than a kind or a kind that is selected from Wimet, sintering metal, pottery and the stainless steel.
15. the manufacture method of the described steel-making dust cured article of claim 12 is characterized in that, forms the rust stable overlay film on the surface above-mentioned shaping die and plunger, that contact with the steel-making dust cured article when being shaped at least.
16. the manufacture method of the described steel-making dust cured article of claim 15, it is characterized in that, described rust stable overlay film be in the carbon of the carbide of nitride, titanium of carbide, the titanium of the nitride that is selected from chromium coating, nickel layer, chromium, chromium and diamond lattic structure more than a kind or a kind.
17. the manufacture method of steel-making dust cured article, the dust that this method produces producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that, with above-mentioned dust granulation, with the state of the granulation body press molding in the above-mentioned shaping die of packing into.
18. the manufacture method of the described steel-making dust cured article of claim 17 is characterized in that the water ratio of described granulation body is 0.5-15wt%.
19. the manufacture method of steel-making dust cured article, the dust that this method produces producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the method for making as its cured article in the shaping die, it is characterized in that, the raw material of the above-mentioned shaping die of packing into is above-mentioned steel-making dust and be the mixture of the powder of main component with carbon, and described is that the amount of the powder of main component is the 1-40wt% of raw material with carbon.
20. the producing apparatus of steel-making dust cured article, the dust press molding that this equipment produces producing in the iron and steel process, main component is iron and oxide compound thereof makes it to solidify the equipment of making as its cured article, it is characterized in that this equipment has: with the shaping die of above-mentioned dust press molding; This shaping die is applied the pressing mechanism of the pressure that is used for press molding; Detect the pressure detection mechanism of the compacting pressure of above-mentioned shaping die; Utilize the above-mentioned pressing mechanism of detected value pressurized control of this pressure detection mechanism to make it to reach the pressurized control mechanism of specified pressure.
21. the manufacturing installation of steel-making dust cured article, the dust that this device produces producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the device of making as its cured article in the shaping die, it is characterized in that this device has: above-mentioned shaping die; Plunger to the pressurization of the dust in this shaping die; Drive the pressurizing device of this plunger; And be used to adjust the water ratio regulating mechanism of water ratio of the steel-making dust before the above-mentioned shaping die of packing into;
Described water ratio regulating mechanism makes the water ratio of the dust of the shaping die of packing into reach 0.5-20wt%.
22. the manufacturing installation of steel-making dust cured article, the dust that this device produces producing in the iron and steel process, main component is iron and oxide compound thereof is packed into, and press molding makes it to solidify the device of making as its cured article in the shaping die, it is characterized in that this device has: as the raw material of the above-mentioned shaping die of packing into is the prilling granulator that the mixing granulation body is made in powder mixes, the granulation of main component with above-mentioned dust with carbon; Above-mentioned shaping die; Plunger to the pressurization of the mixing granulation body in this shaping die; Drive the pressurizing device of this plunger; And be used to adjust the water ratio regulating mechanism of water ratio of mixing granulation body of above-mentioned shaping die of packing into.
23. the manufacturing installation of claim 21 or 22 described steel-making dust cured articles is characterized in that, described water ratio regulating mechanism uses sprinkler system.
24. the manufacturing installation of claim 21 or 22 described steel-making dust cured articles is characterized in that, described water ratio regulating mechanism uses drying installation.
25. the manufacturing installation of the described steel-making dust cured article of claim 22 is characterized in that, the corrosion resistant material is used on surface above-mentioned shaping die and plunger, that contact with the steel-making dust cured article when being shaped at least.
26. the manufacturing installation of the described steel-making dust cured article of claim 25 is characterized in that, described corrosion resistant material is the material more than a kind or a kind that is selected from Wimet, sintering metal, pottery and the stainless steel.
27. the manufacturing installation of the described steel-making dust cured article of claim 25 is characterized in that, forms the rust stable overlay film on surface above-mentioned shaping die and plunger, that contact with the steel-making dust cured article when being shaped at least.
28. the manufacturing installation of the described steel-making dust cured article of claim 27, it is characterized in that, described rust stable overlay film be in the nitride that is selected from chromium coating, nickel layer, chromium, the carbide of chromium, the nitride of titanium, the carbide of titanium and the carbon of diamond lattic structure etc. more than a kind or a kind.
CNB2005101079736A 2004-10-06 2005-09-30 Steel-making solidify and manufacturing method and device Expired - Fee Related CN100463982C (en)

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JP2004293630A JP2006104528A (en) 2004-10-06 2004-10-06 Solidified material of steelmaking dust, and manufacturing method therefor
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JP2005041639 2005-02-18

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