CN1533443A - Method for accelerating separation of granular metallic iron from slag - Google Patents
Method for accelerating separation of granular metallic iron from slag Download PDFInfo
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- CN1533443A CN1533443A CNA02811874XA CN02811874A CN1533443A CN 1533443 A CN1533443 A CN 1533443A CN A02811874X A CNA02811874X A CN A02811874XA CN 02811874 A CN02811874 A CN 02811874A CN 1533443 A CN1533443 A CN 1533443A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/06—Conveyors on which slag is cooled
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/068—Receptacle features where the slag is treated with a sealed or controlled environment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/072—Tanks to collect the slag, e.g. water tank
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
Abstract
A method for accelerating the separation of a granular metallic iron from slag, characterized in that, in a method for the production of a granular metallic iron comprising reducing and melting a raw material lump composed of an iron oxide containing material and a carbonaceous reducing agent, a solid mixture of the granular metallic iron formed by the above reduction and melting and a by-produced slag is quenched to thereby accelerate the separation of the granular metallic iron from the by-produced slag. The method can be used for producing a metallic iron being satisfactorily freed of slag and having a improved purity of iron.
Description
Technical field
The present invention relates to a kind ofly when the reducing and smelting by the raw material agglomerate of raw material that contains ferric oxide and carbon containing reducer prepares metallic iron, promote as the granulated metal iron of target product with as the isolating method of the slag of by product.More specifically, the present invention relates to a kind of easy blended solid and be separated into improving one's methods of granulated metal iron and slag granulated metal iron and slag, described granulated metal iron is to make by base feed agglomerate and reduction, fusion in the reducing and smelting stove and the ferriferous oxide that accumulates in the raw material agglomerate, and described slag produces as by product.
Background technology
When the metallic iron that will hang down the iron grade (wherein contains a large amount of slag components as the gangue component in the iron ore of raw material with as the ash content in the carbon raw material of raw material, described slag components such as SiO
2, Al
2O
3And CaO) supplies with as at steel melting furnace for example in converter or the electric furnace during raw material of molten pig, many problems take place, and reason is that electric furnace is subjected to the disadvantageous effect that slag amount increases, and the iron productive rate reduces owing to iron is mixed in the slag, the energy expenditure of unit product increases, and productivity reduces.Thereby the metallic iron of high ferro grade that need have low slag components content is as the raw material of molten pig.Method for the metallic iron for preparing this high ferro grade, known improvement, for example a kind of direct ironmaking method such as shaft furnace method, wherein by preparing metallic iron by the raw material of carbon raw material and the direct reduction of iron oxide-containing of reducing gas such as iron ore and/or ferriferous oxide, with a kind of as at United States Patent (USP) 3,443, the disclosed method for preparing metallic iron in 931, it comprises the form that carbon raw material and Powdered ferriferous oxide is mixed into agglomerate or ball ball, and the step of going back original mixture down on the rotation siege in heating.By using improving one's methods of this class, prepared the metallic iron of high ferro grade.
For example, the open 2000-144244 of the patent application of Japanese unexamined is known as the iron smelting method that obtains high purity metal iron, and it is that reducing and smelting by the raw material agglomerate of the raw material that contains ferric oxide such as iron ore and/or ferriferous oxide and carbon containing reducer such as coke obtains.As disclosed during that is open, obtaining in the technology of granulated metal iron by the reducing and smelting of use moving hearth formula reducing and smelting stove by the raw material agglomerate, to make the raw material agglomerate remain on solid state simultaneously in the reduction of the ferriferous oxide in the raw material agglomerate.Then, make metallic iron and as fusion and the gathering respectively of the slag of by product.Then, by cooling melt metal iron and slag fused (with wherein they being cooled to for example about 1100 to 900 ℃ first cooling step), melt metal iron and slag fused are become be solid state (being called " granulated metal iron " and " slag granules " respectively).After cooling and solidifying, granulated metal iron and slag granules are emitted from stove.After the discharging, granulated metal iron and slag granules are placed with naturally cooling (secondary cooling).Have again, by suitable tripping device with granulated metal iron and slag granules selective separation so that only with granulated metal iron as the molten pig raw material supply to steel melting furnace etc.
In the above among the preparation method of described metallic iron, cooling is divided into first cooling stages and second cooling stages, in first cooling stages with metallic iron and slag cooling curing to the level that is lower than its solidification point,, and in second cooling stages for metallic iron transportation and selection and further reduce its temperature subsequently.
Although many situations are to carry out first cooling stages in the reducing and smelting stove, slag granules often exists with a kind of so unsegregated state (being called " blended solid ") after first cooling stages, and promptly slag granules adheres to the state of granulated metal iron.In addition, granulated metal iron and slag granules are being positioned over outside the stove with second cooling stages of naturally cooling, metallic iron and slag can not be separated from each other fully.Therefore, be difficult to be screened by magnetic force under high-level efficiency, sieve etc. are only collected granulated metal iron separately, and the slag that is difficult to avoid a large amount of is mixed in the granulated metal iron.Therefore, has the higher metallic iron of self purity even use, the molten slag that produces in steel melting furnace also increases, and reason is inevitable mixing the in metallic iron and does not have distinct slag components, causes the disadvantageous effect for processing property and quality product thus.According to those situations of this area, need a kind of technology that before carrying out screening and separating, they efficiently can be separated with metallic iron with as the slag of by product.
Consider top described problem in association area, an object of the present invention is when the reducing and smelting by the raw material agglomerate of raw material that contains ferric oxide and carbon containing reducer prepares granulated metal iron, provide a kind of promotion as target product granulated metal iron and as the isolating method of the slag of by product, preparation wherein separates slag and the metallic iron of the high ferro grade of removing satisfactorily thus.
Summary of the invention
Successfully in the described problem on solve the invention reside in a kind of method that promotes to separate granulated metal iron and slag, this method be with cause contain the raw material of ferric oxide and carbon containing reducer the raw material agglomerate reducing and smelting and prepare granulated metal iron, wherein the blended solid of the slag that will produce by the granulated metal iron of reducing and smelting preparation with as by product fast cooling be separated from each other to promote granulated metal iron and by product slag.When putting into practice method of the present invention, recommend to use the quick cooling mixing solid of refrigerant.Also recommend: from the solidification value to 150 of granulated metal iron ℃ to the small part scope, preferably to be not less than 250 ℃/minute, the speed of cooling that more preferably is not less than 350 ℃/minute is cooled off blended solid fast.In a preferred embodiment of the invention, water as refrigerant, up to reaching 150 ℃ of quick coolings that stop metallic iron, and will be resided in and be attached to the moisture drying on the metallic iron.
The accompanying drawing summary
Figure 1 shows that the schematic illustration of an example of annular movement siege formula reducing and smelting stove of the present invention.
Fig. 2 is the sectional view along the A-A line of Fig. 1.
Figure 3 shows that in Fig. 1 moving hearth sense of rotation and observe the explanatory view that launches the reducing and smelting stove part of form.
Figure 4 shows that the schematic illustration of water spray cooling blended solid method.
Figure 5 shows that the schematic illustration of the cooling mixing solid method that is soaked in water.
Figure 6 shows that schematic illustration with nitrogen cooling mixing solid method.
Figure 7 shows that the schematic illustration of water cooling mixing solid method.
Implement best mode of the present invention
As in order to solve and the result who furthers investigate in the problem of association area, the inventor has finished the present invention based on following discovery: by the blended solid of quick cooling granulated metal iron and slag, promoted separating of granulated metal iron and by product slag significantly, described granulated metal iron is prepared by the reducing and smelting of the raw material agglomerate of raw material that contains ferric oxide and carbon containing reducer, and described slag produces as by product.
In the present invention, the raw material agglomerate comprises the raw material that contains ferric oxide such as material and carbon containing reducer such as the coke and the coal of iron ore and ferriferous oxide or its partial reduction.If desired, the raw material agglomerate can contain any suitable additive.In addition, the raw material agglomerate is not defined as a kind of specific shape at vpg connection, but can be with the ball ball, preparation such as the form of briquet etc.Have again,, can form the raw material agglomerate by any proper method that depends on the agglomerate shape.In addition, do not have to contain the raw material of ferric oxide and the mixture ratio of carbon containing reducer is defined as a specific value, but can select a suitable value according to application target.The size of raw material agglomerate is not defined as a specific value yet.
Reducing and smelting by raw material agglomerate recited above prepares granulated metal iron.The practical methods with reducing and smelting is not defined as a kind of specific method, but can use well-known reducing and smelting stove to carry out.Must be noted that the present invention is not limited to following description and illustrational embodiment when move method that siege formula reducing and smelting stove prepares metallic iron and describe when of the present invention below in conjunction with for example using.With reference to the accompanying drawing that is depicted as reducing and smelting stove actual configuration, will describe the present invention in detail.
Fig. 1 to 3 is depicted as the schematic illustration that is applied to an example of moving hearth formula reducing and smelting stove of the present invention by inventor's exploitation.This stove is the individual dome-like structures that has with the rotation moving hearth of ring form.Particularly, Fig. 1 is a perspective illustration, and Fig. 2 is the sectional view along the A-A line of Fig. 1, and Fig. 3 observes for the sense of rotation at the rotation siege of Fig. 1, shows the signal key drawing of a reducing and smelting stove part with the expansion form, to be more readily understood.In these figure, numeral 1 expression rotation siege, and 2 expressions comprise the body of heater that rotates siege.Rotation siege 1 is to construct like this: it can be driven to rotate under suitable speed by the drive unit (not shown).
But certainly, the structure with moving hearth formula reducing and smelting stove of the present invention is not defined as shape shown in Fig. 1 to 3 and structure.As long as the reduction smelting furnace comprises moving hearth as component units, the present invention also can adopt the moving hearth formula with any other structure such as the various reducing and smelting stoves of belt type roasting machine formula effectively.
Suitable location is settled a plurality of burners 3 in the surface, furnace wall of body of heater 2.To give the raw material agglomerate of on rotation siege 1, placing by the combustion heat and radiation heat transfer that burner 3 produces, to carry out the thermal reduction reaction of raw material agglomerate.In a preferred embodiment of as directed body of heater 2, by three partition K
1, K
2, K
3The inside of body of heater 2 is separated into: the first district Z
1, the second district Z
2, the 3rd district Z
3With the 4th district Z
4On body of heater 2 sense of rotation, settle the feeding unit 4 of raw material agglomerate with respect to the upstream side of rotation siege 1, provide discharge equipment 6 in the downstream side (in other words because rotational structure is being positioned at the direct upstream side of feeding unit 4) of sense of rotation.
In the operation of this reducing and smelting stove, siege 1 is rotated in rotation at a predetermined velocity, and from feeding unit 4 base feed agglomerate on rotation siege 1, so that raw material sintering ore bed has suitable thickness.Make the raw material agglomerate of on rotation siege 1, placing accept the combustion heat and the radiant heat that is produced by burner 3, simultaneously at the first district Z
1Move.Under the help by carbon raw material in the raw material agglomerate and the carbon monoxide that burning produced by carbon raw material, the ferriferous oxide of reduction in the raw material agglomerate keeps solid state simultaneously under heating.Then, at the second district Z
2, further reduction raw material agglomerate under heating prepares metallic iron by reducing iron oxides almost completely thus.With the metallic iron that produces at the 3rd district Z
3Further heating is thus with its carburizing and fusion.Zhi Bei molten metal iron and exist with a kind of like this state thus as the molten slag of by product, promptly molten slag lies low on molten metal iron, and reason is the difference in specific gravity between them.At the 4th district Z that solidifies usefulness
4In, by any suitable cooling device C molten metal iron and molten slag are cooled to the temperature that is not higher than its solidification point.Discharge solidified metallic iron and slag in succession by discharge equipment 6.By cooling and curing, melt metal iron and molten slag major part are separated into granulated metal iron and slag granules, still,, also exist to comprise the granulated metal iron (blended solid) that is attached to the slag on the iron owing to not exclusively separate.Therefore, to the discharging of stove outside granulated metal iron, slag granules and blended solid.Pai Fang (following " blended solid etc. " not only are meant blended solid, also refer to granulated metal iron and slag granules) such as blended solids is in relative high state of temperature (for example approximately from solidification value to 900 ℃) at that time.
In the present invention, the blended solid that will be in the discharging of this relatively-high temperature degree state cools off fast, by utilize the poor of the metallic iron all contain and the contraction rate between the slag in blended solid, promotes being separated from each other of metallic iron and slag.As a result of, blended solid is separated into the granulated metal iron that contains slag components hardly and slag granules (by as contain as gangue component in the iron ore of raw material and as the slag components such as the SiO that contain as ash content in the carbon raw material of raw material
2, Al
2O
3Formed with CaO).
In the present invention, term " fast cooling " is meant than mixing solid and places with the situation of naturally cooling in atmosphere and cool off faster.But, consider from the effect aspect that improve to promote metallic iron and slag to be separated from each other, special recommendation be for example use the quick cooling mixing solid of refrigerant, and use heat to be impacted mixed solid.In addition, preferably to be not less than 250 ℃/minute the quick cooling mixing solid of speed of cooling, reason is to be distorted at the contact surface of metallic iron and slag, this is because all be contained in the flip-flop (i.e. difference aspect thermal expansivity) aspect contraction speed between metallic iron in the blended solid and the slag, promotes separating of metallic iron and slag thus.Preferred speed of cooling is not less than 350 ℃/minute.Can calculate speed of cooling by continuously measured in the temperature variation in the blended solid of stove outside discharging.
Rapid cooling method is not defined as a kind of specific method, but preferred liquid and/or the rare gas element of using cools off fast as refrigerant.Recommend the quick cooling with liquid, reason is that liquid can provide higher speed of cooling than inert gas, produces higher separating effect thus.Do not have to be used for quick refrigerative liquid and be defined as a specific liquid, and for whether without limits adding any additives to liquid.Consider from economy, safety and cooling efficiency aspect, preferably make water.In addition, be not particularly limited, but consider, preferably use nitrogen from economy and secure context for the use of inert gas.
When water was cooled off fast, the water yield by regulating supply with any suitable waterworks simultaneously to the blended solid spray water can obtain the ideal speed of cooling.Shown in Figure 4 as example, by the feed-pipe 8 that moves with it to running gear 9 as endless belt conveyor on the blended solid that gives off of transmission moving hearth formula stove etc., and the spray equipment 11 that provides with any required number with any suitable interval is to spray waters such as blended solids.Separating of the quick cooling mixing solid of water of spray etc. and promotion slag and metallic iron, reason is the difference aspect contraction rate between them, obtains granulated metal iron and slag granules thus.Alternatively, by in cooling tank, forming Chi Shui and by optionally supply and discharge water and control water temperature, cooling mixing solid etc. fast under required speed of cooling.As make the shown in Figure 5 of example, the blended solids that will emit from moving hearth formula stove 7 etc. import the cooling tank 13 that water 12 is full of by feeding unit 8 as feed-pipe, to be soaked in the water.After being quickly cooled to preset temperature, blended solid etc. is taken out from cooling tank with any suitable e Foerderanlage such as transfer roller.For the method for rapid cooling of water spray, more preferably blended solid etc. is immersed in the method for rapid cooling in the water, because it can provide higher speed of cooling, bigger contraction rate is poor and produce higher segregation rate thus.
When using the quick cooling mixing solid of rare gas element such as nitrogen, although show, can directly spray inert gas to blended solid etc., perhaps blended solid etc. can be exposed in the inert gas atmosphere.
In addition, rapid cooling method is not defined as method recited above, and can implements those method for rapid cooling with any required combination.For example, can be by spray water under nitrogen atmosphere quick cooling mixing solid etc., or can be spray water after under nitrogen atmosphere quick cooling mixing solid.
Have, blended solid etc. are high more in the quick refrigerative temperature of beginning, and are big more by the separating effect that quick cooling caused again.It is therefore preferable that when they are in the condition of high temperature, at quick cooling mixing solid etc. immediately after stove discharging.Because the temperature of the blended solid that emits etc. depends in stove blended solid etc. is cooled to any degree from stove, so the actual temperature will not begin cooling fast the time is defined as a specific value.But, because the blended solids that emit from stove etc. are in solid state usually, fast the refrigerative preferred range be from metallic iron solidification point (about 1280 ℃) to 150 ℃ to the small part scope.If cooling starts from being lower than 150 ℃ temperature fast, in some cases, enough thermal shockings can not be applied to cooling solid etc., and can not obtain the separating effect under satisfactory level.
This statement of the scope of " to small part " is meant: cooling does not require in whole temperature range and carries out from the beginning to the end fast.For example, it is meant: when from the solidification point to 150 of metallic iron ℃ to the small part scope, when cooling off fast with the speed of cooling that is not less than 250 ℃/minute, can blended solid etc. be placed with naturally cooling in other temperature range, this other temperature range is to carry out fast the extraneous temperature range of a part from the solidification point to 150 of metallic iron ℃ except mixing solid etc. with the speed of cooling that is not less than 250 ℃/minute.In other words, it is not meant: the quick cooling of blended solid etc. must carried out in the scope of the solidification point to 150 of metallic iron ℃ from the beginning to the end.Have again, can cool off fast surpassing scope recited above, and it is not meant when temperature reaches 150 ℃ and must stops quick cooling.For example, in the scope of the solidification point to 150 of metallic iron ℃ fast behind the cooling mixing solid etc., in being lower than 150 ℃ temperature range, can further cool off fast.In a word, fast cooling requires to stop in temperature required reaching.
As mentioned above, since by utilization be attributable at the interface the distortion between metallic iron and slag that causes by the thermal shocking that quick cooling causes broken develop of the present invention based on the effect of quick refrigerative promotes, so can be chosen as quick cooling time very short.For example, even the quick cooling in several seconds also is enough for finishing purpose of the present invention.Particularly, when adopting refrigerant when cooling off fast, when blended solid being brought into when refrigerant contacts, blended solid is cooled off and is obtained the effect of promotes fast.For example, soak in water under the situation of blended solid, when blended solid being brought into when water contacts, the temperature of blended solid is reduced suddenly, so in the fragmentation that is distorted at the interface of metallic iron and slag, cause separating of metallic iron and slag thus.Certainly, be immersed in blended solid in the water therein during, still carrying out the quick cooling of blended solid, and the contraction rate that has increased between metallic iron and slag at the interface is poor in the blended solid that still keeps with separate stage not.Therefore, further strengthened the promotes effect, and reduced the not separation rate of slag from metallic iron.
In addition, also preferred except making water cools off fast in the present invention up to reaching 150 ℃ of quick coolings that just stop metallic iron, then metallic iron is placed with naturally cooling.Show in addition, stop quick cooling (stopping to contact of blended solid etc. and water) after 150 ℃, then blended solid etc. is placed with naturally cooling, be attached to moisture on the metallic iron by the heat of vaporization of metallic iron self by using water cooling blended solid etc.Thereby, do not needing to provide under the condition of any drying installation such as moisture eliminator, can dry metallic iron.
In described,, method of the present invention has been described in the above in conjunction with the situation that quick cooling is put from the reducing and smelting fire grate with the blended solid of granulated metal iron and slag granules.But, the present invention also can be applied to following situation: when granulated metal iron, slag granules and blended solid are emitted from the reducing and smelting stove, by any suitable screening plant (as sieve or magnetic force screening plant) metallic iron and slag are separated from each other, then by optionally collecting granulated metal iron, slag granules and blended solid, and optionally only take out blended solid, or blended solid and granulated metal iron.Therefore, no matter whether granulated metal iron and/or slag granules except that blended solid exist, can implement method of the present invention.
In addition, according to method of the present invention, be separated from each other as granulated metal iron and slag granules by the metallic iron and the slag that will in blended solid, contain, optionally collect granulated metal iron and slag granules by any suitable screening plant (as sieve or magnetic force screening plant) then, can finally obtain having purity and be not less than approximately 95%, more preferably be not less than about 98% and contain the metallic iron raw material of very small amount of slag components.
Below in conjunction with embodiment method of the present invention is described.But, must be noted that the following examples are not intended to limit the present invention, and according to as above with purport of the present invention as described below, can revise the present invention in suitable mode.
Embodiment
The raw material agglomerate of in the moving hearth formula reducing and smelting stove shown in Fig. 1 to 3, packing into and containing iron ore and coal, use the combustion heat and the radiant heat that are produced by fuel device to add thermal reduction (temperature in the stove: 1300 ℃) then, the raw material agglomerate keeps solid state simultaneously.Under reducing atmosphere,, produce thus as the metallic iron of target product with as the mixture of the slag of by product with further heating and the fusion of raw material agglomerate.In stove, mixture is cooled to 1000 ℃.Solidified granulated metal iron, slag granules and blended solid emit from stove the discharge equipment that provides by the place, downstream side at the siege travel direction by cooling with all.By feed-pipe the blended solid etc. of discharging is directed into and is used for quick refrigerative cooling tank, to the refrigerant shown in the supply schedule 1 wherein.Use nitrogen to be shown in Fig. 6 as the cooling tank of refrigerant.By supply with nitrogen (flow: 10Nm to cooling tank always
3/ hour) with coolings fast such as blended solids, regulate the flow of nitrogen simultaneously so that keep speed of cooling under 250 ℃/minute.In addition, by vapor pipe 14 discharging nitrogen, regulate the flow of the nitrogen of supplying with.When the temperature with metallic iron etc. is reduced to room temperature, as required metallic iron etc. is taken out from cooling tank, and measure the total amount (referring to " blended solid quality " and " slag is the separation rate not " in the table 1) of blended solid.Under nitrogen refrigerative situation, by thermopair being inserted the temperature of measuring metallic iron etc. in a lot of blended solids be to pile up in the cooling tank.Make water be shown in Fig. 7 as the cooling tank of refrigerant.Importing before blended solid in the cooling tank etc. cools off, in cooling tank, form Chi Shui.As the result with the speed of cooling of water logging blister attitude independent measurement blended solid etc., speed of cooling is 350 ℃/minute.When the temperature that will mix solid etc. is reduced to room temperature, will mixes solid etc. as required and from cooling tank, take out, and measure the total amount of blended solid.Measuring result is shown in table 1.
Have again, under water-cooled situation, separately measure the resulting speed of cooling that is soaked in water.More specifically, in process furnace, be heated in a lot of blended solids of 1000 ℃ and insert thermopair, and under water logging blister attitude, measure the speed of cooling of blended solid.
Table 1
| The test sequence number | The nitrogen cooling | Water cooling | Reduction ratio | ||||
| Total mass Kg | The quality Kg of blended solid | Slag is separation rate % not | Total mass Kg | The quality Kg of blended solid | Slag is separation rate % not | ||
| ?1 | ?7.40 | ?0.70 | ?9.5 | ?7.47 | ?0.15 | ?2.0 | ?0.21 |
| ?2 | ?6.40 | ?0.35 | ?5.5 | ?6.50 | ?0.05 | ?0.8 | ?0.15 |
| ?3 | ?6.00 | ?0.15 | ?2.5 | ?5.40 | ?0.01 | ?0.2 | ?0.08 |
*" total mass Kg " is meant the quality of blended solid before the cooling beginning.
*" the quality Kg of blended solid " is meant the quality of the blended solid that stays after the cooling.
*" slag is separation rate % not "=(the quality Kg of blended solid)/(total mass Kg)
*" reduction ratio "=(with water-cooled slag separation rate % not)/(with nitrogen refrigerative slag separation rate % not)
Can find out from table 1,, can from blended solid, separate and remove slag by adopting nitrogen or water as refrigerant.In addition, adopt water to adopt nitrogen to reveal lower not separation rate as the test card of refrigerant as the test of refrigerant as can be seen, the method for rapid cooling that is soaked in water thus is preferred method for rapid cooling.
Comparative example
Under the condition identical, use moving hearth formula reducing and smelting stove to prepare granulated metal iron with embodiment recited above.The blended solid that will emit from stove etc. is positioned in the atmosphere naturally cooling to room temperature, but obtains very high not separation rate (15%).
Industrial usability
As mentioned above, the method according to this invention can easily make metallic iron and the slag as the hybrid solid component that emit from stove be separated from each other. Owing to the invention provides the metallic iron raw material that does not have slag and have high ferro purity, by build utilizing the metallic iron raw material that provides thus as the continuous system of the raw material of steel-making, can under high production rate, prepare and have the molten steel of stabilised quality, reduce simultaneously the electric energy that the electric furnace by unit product consumes.
Claims (5)
1. one kind promotes granulated metal iron and the isolating method of slag, this method is to prepare granulated metal iron with the reducing and smelting of cause raw material agglomerate, described raw material agglomerate contains the raw material and the carbon containing reducer of ferric oxide, wherein the blended solid of the slag that will produce by the granulated metal iron of reducing and smelting preparation with as by product cools off fast, to promote being separated from each other of granulated metal iron and by product slag.
2. method according to claim 1, wherein said quick cooling is to use refrigerant to carry out.
3. method according to claim 1 and 2, wherein said quick cooling be from the solidification value to 150 of granulated metal iron ℃ to the small part scope, carry out with the speed of cooling that is not less than 250 ℃/minute.
4. method according to claim 3, wherein said quick cooling are to carry out with the speed of cooling that is not less than 350 ℃/minute.
5. according to any one described method of claim 1 to 4, wherein with water as refrigerant, up to reaching 150 ℃ of quick coolings that just stop granulated metal iron, and will be deposited in and be attached to the moisture drying on the granulated metal iron.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP223266/2001 | 2001-07-24 | ||
| JP2001223266A JP2003034813A (en) | 2001-07-24 | 2001-07-24 | Method for promoting separation between granular metal iron and slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1533443A true CN1533443A (en) | 2004-09-29 |
Family
ID=19056630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA02811874XA Pending CN1533443A (en) | 2001-07-24 | 2002-06-17 | Method for accelerating separation of granular metallic iron from slag |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US20040168550A1 (en) |
| EP (1) | EP1411135A4 (en) |
| JP (1) | JP2003034813A (en) |
| KR (1) | KR100660658B1 (en) |
| CN (1) | CN1533443A (en) |
| AU (1) | AU2002311297B2 (en) |
| CA (1) | CA2448383A1 (en) |
| RU (1) | RU2312899C2 (en) |
| TW (1) | TW533239B (en) |
| WO (1) | WO2003010342A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105658825A (en) * | 2013-10-25 | 2016-06-08 | 赛拉梅塔尔有限公司 | Apparatus for recycling waste raw material |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7618476B2 (en) * | 2001-09-19 | 2009-11-17 | Nippon Steel Corporation | Method and apparatus for cooling reduced-iron agglomerate |
| JP3679084B2 (en) * | 2002-10-09 | 2005-08-03 | 株式会社神戸製鋼所 | Method for producing molten metal raw material and method for producing molten metal |
| KR100768562B1 (en) * | 2006-09-15 | 2007-10-19 | 주식회사 대진디엠피 | Light emitting diode device and control method thereof |
| US20110018179A1 (en) | 2009-06-29 | 2011-01-27 | Bairong Li | Metal reduction processes, metallurgical processes and products and apparatus |
| JP2013227605A (en) * | 2012-04-24 | 2013-11-07 | Kobe Steel Ltd | Metallic iron-containing sintered body |
| JP6273891B2 (en) * | 2014-02-20 | 2018-02-07 | 新日鐵住金株式会社 | Method and apparatus for reducing metal oxide by moving hearth furnace |
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| DE69112385T2 (en) * | 1990-02-13 | 1996-02-22 | Illawarra Tech Corp Ltd | JOINT TREATMENT OF WASTEWATER AND WASTE OF STEELWORKS. |
| JP3145834B2 (en) * | 1993-03-08 | 2001-03-12 | 株式会社神戸製鋼所 | Method for producing reduced iron briquettes |
| AT404361B (en) * | 1995-01-23 | 1998-11-25 | Voest Alpine Ind Anlagen | METHOD AND DEVICE FOR COOLING HOT IRON SPONGE |
| JPH10158710A (en) * | 1996-12-02 | 1998-06-16 | Sumitomo Metal Mining Co Ltd | Production of reduced iron pellet |
| US6383251B1 (en) * | 1997-08-22 | 2002-05-07 | William Lyon Sherwood | Direct iron and steelmaking |
| JP4159634B2 (en) * | 1997-10-23 | 2008-10-01 | 株式会社神戸製鋼所 | Metallic iron manufacturing method and equipment |
| US6413295B2 (en) * | 1998-11-12 | 2002-07-02 | Midrex International B.V. Rotterdam, Zurich Branch | Iron production method of operation in a rotary hearth furnace and improved furnace apparatus |
| JP3009661B1 (en) * | 1999-01-20 | 2000-02-14 | 株式会社神戸製鋼所 | Method for producing reduced iron pellets |
| US6214087B1 (en) * | 1999-03-19 | 2001-04-10 | Midrex International B.V. Rotterdam, Zurich Branch | Treatment of iron oxide agglomerates before introduction into furnace |
| ATE350494T1 (en) * | 2000-03-30 | 2007-01-15 | Kobe Steel Ltd | METHOD FOR PRODUCING IRON METALLIC |
| JP3735004B2 (en) * | 2000-03-31 | 2006-01-11 | 住友重機械工業株式会社 | Method and apparatus for recovering melt discharged from rotary kiln |
| TW562860B (en) * | 2000-04-10 | 2003-11-21 | Kobe Steel Ltd | Method for producing reduced iron |
| US20020053307A1 (en) * | 2000-10-31 | 2002-05-09 | Natsuo Ishiwata | Method for discharging reduced product from a moveable-hearth furnace and a discharging device |
| US6648942B2 (en) * | 2001-01-26 | 2003-11-18 | Midrex International B.V. Rotterdam, Zurich Branch | Method of direct iron-making / steel-making via gas or coal-based direct reduction and apparatus |
| JP4669189B2 (en) * | 2001-06-18 | 2011-04-13 | 株式会社神戸製鋼所 | Production of granular metallic iron |
| JP4266284B2 (en) * | 2001-07-12 | 2009-05-20 | 株式会社神戸製鋼所 | Metal iron manufacturing method |
| TWI282818B (en) * | 2003-01-16 | 2007-06-21 | Kobe Steel Ltd | A rotary hearth furnace and iron production method thereby |
| JP4167101B2 (en) * | 2003-03-20 | 2008-10-15 | 株式会社神戸製鋼所 | Production of granular metallic iron |
| JP4167113B2 (en) * | 2003-04-17 | 2008-10-15 | 株式会社神戸製鋼所 | Method and apparatus for producing reduced iron |
-
2001
- 2001-07-24 JP JP2001223266A patent/JP2003034813A/en active Pending
-
2002
- 2002-06-17 KR KR1020047000982A patent/KR100660658B1/en not_active IP Right Cessation
- 2002-06-17 AU AU2002311297A patent/AU2002311297B2/en not_active Ceased
- 2002-06-17 CA CA002448383A patent/CA2448383A1/en not_active Abandoned
- 2002-06-17 EP EP02736124A patent/EP1411135A4/en not_active Withdrawn
- 2002-06-17 RU RU2004105153/02A patent/RU2312899C2/en not_active IP Right Cessation
- 2002-06-17 WO PCT/JP2002/005996 patent/WO2003010342A1/en active Application Filing
- 2002-06-17 US US10/483,981 patent/US20040168550A1/en not_active Abandoned
- 2002-06-17 CN CNA02811874XA patent/CN1533443A/en active Pending
- 2002-07-24 TW TW091116447A patent/TW533239B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105658825A (en) * | 2013-10-25 | 2016-06-08 | 赛拉梅塔尔有限公司 | Apparatus for recycling waste raw material |
| CN105658825B (en) * | 2013-10-25 | 2018-06-22 | 赛拉梅塔尔有限公司 | Waste material recycling and processing device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW533239B (en) | 2003-05-21 |
| KR20040013155A (en) | 2004-02-11 |
| RU2312899C2 (en) | 2007-12-20 |
| WO2003010342A1 (en) | 2003-02-06 |
| RU2004105153A (en) | 2005-06-10 |
| EP1411135A1 (en) | 2004-04-21 |
| CA2448383A1 (en) | 2003-02-06 |
| EP1411135A4 (en) | 2007-08-22 |
| AU2002311297B2 (en) | 2008-07-10 |
| KR100660658B1 (en) | 2006-12-21 |
| US20040168550A1 (en) | 2004-09-02 |
| JP2003034813A (en) | 2003-02-07 |
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