KR101442920B1 - Manufacturing method and apparatus for reduced iron - Google Patents

Abstract

More particularly, the present invention relates to a method and an apparatus for producing reduced iron, and more particularly, to a method and an apparatus for producing reduced iron, which comprises recovering phosphorus, zinc and alkali elements while producing reduced iron having excellent reduction ratio by using iron ore containing a large amount of phosphorus, zinc and alkali elements, And a manufacturing method thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to a reduced iron producing method and an apparatus for producing reduced iron,

More particularly, the present invention relates to a method and an apparatus for producing reduced iron, and more particularly, to a method and an apparatus for producing reduced iron, which comprises recovering phosphorus, zinc and alkali elements while producing reduced iron having excellent reduction ratio by using iron ore containing a large amount of phosphorus, zinc and alkali elements, And a manufacturing method thereof.

In blast furnace, converter and electric furnace, reduced iron is used as raw material for making molten iron or molten steel.

Reduced iron is produced by reducing an iron oxide source such as iron ore or iron oxide with a carbonaceous reducing agent (hereinafter also referred to as "carbonaceous material ") or a reducing gas, and a direct iron process is mainly used as a method of obtaining reduced iron.

In this general direct reduction iron (DRI) production process, a process of producing a reduced iron by producing a pellet of a minute iron ore and inducing a reduction in a rotary hearth furnace (RHF) has been developed.

For example, a method for producing reduced iron using a rotary hearth furnace is described in detail in "Method for producing reduced iron pellets and method for producing pig iron (Patent Publication 10-2010-0043095); Patent Document 1" 10-2010-0122946; Patent Document 2). "

Patent Document 1 and Patent Document 2 all relate to a technique for producing reduced iron using a rotary furnace, and in particular, Patent Document 1 discloses a technology for improving the reactivity by managing the particle size of a raw material for the purpose of increasing the metallization rate in the production of reduced iron And Patent Document 2 relates to a technique for producing reduced iron from iron ores containing zinc at a high concentration.

Since the rotary furnace for producing the conventional reduced iron is a closed type and the iron ores are reduced in a reducing atmosphere at a maximum of 1,350 DEG C, there is a difficulty in controlling the furnace inside the reducing atmosphere and the production is in the range of 150,000 to 500,000 tons There was a limit to mass production.

Therefore, in order to mass-produce reduced iron, there is a need for a new method of producing reduced iron that exceeds the limit of the rotary furnace.

Thus, in the past, a process for producing partially reduced light using a burning furnace in an oxidizing atmosphere has been proposed. However, due to the oxidizing atmosphere in the burning furnace, the amount of carbon used as a reducing agent for iron ores There is a problem that the reduction efficiency of the iron ore is low because the amount of carbon used for the reduction is low because the amount of the combustion heat is relatively large.

In addition, in the case of using a sintering furnace in an oxidizing atmosphere, there is a problem in that the reduction rate can not be increased due to the reoxidation due to the ambient oxidizing atmosphere after the reduction of the iron ore.

On the other hand, phosphorus (P), zinc (Zn) and alkali oxides (K ₂ O + Na ₂ O) contained in iron ores are impurities which cause various defects when they are contained in the final product in excess, Reduced iron was produced using iron ore containing less phosphorus (P), zinc (Zn) and alkali oxides (K ₂ O + Na ₂ O).

However, in recent years, high-quality iron ore containing a small amount of impurities has been depleted, leading to a rise in the quality of iron ore, resulting in limited production of reduced iron with only high-quality iron ore. Therefore, in order to remove the impurities in the steelmaking process, it is inevitable to add various additives and processes for removing impurities, thereby increasing the production cost.

[Patent Document 1] Japanese Patent Application Laid-Open No. 10-2010-0043095 (Apr. 27, 2010) [Patent Document 1] Japanese Patent Application Laid-Open No. 10-2010-0122946 (November 23, 2010)

The present invention provides a reduced iron production method and apparatus capable of producing reduced iron in an open type reducing furnace in an oxidizing atmosphere.

In particular, the present invention provides a reduced iron production method and apparatus for forming compacted light using a mixture of iron ore and a carbon material in advance, and reducing the iron in a reducing furnace in an oxidizing atmosphere.

The present invention also provides a method of producing reduced iron by using iron ores having a high phosphorus (P) content, iron ores having a high zinc (Zn) content, and iron ores having a high content of an alkali oxide (K ₂ O + Na ₂ O) A method and apparatus for manufacturing reduced iron that can be widened.

The present invention also provides a reduced iron production method and apparatus capable of separating and recovering phosphorus (P), zinc (Zn), and alkaline oxide (K ₂ O + Na ₂ O) in iron ores during the production of reduced iron.

According to an embodiment of the present invention, there is provided a reduced iron manufacturing method comprising: preparing a mixture by mixing an iron raw material containing phosphorus, zinc, and an alkali oxide with a carbonaceous material; Molding the mixture into compacted light; Separating the phosphorus, zinc and alkali elements contained in the intense light while reducing the intense light in the open reduction reactor; Crushing the reduced material with the compacted light and separating the reduced material into slag containing reduced iron and phosphorus; The separated reduced iron is compacted, and the slag is recovered.

Characterized in that the mixture contains 0.06% or more phosphorus (P), 0.02% or more zinc (Zn) and 0.1% or more of an alkali oxide (K ₂ O + Na ₂ O) do.

In the step of forming the mixture, the iron raw material preferably contains iron ore having a phosphorus (P) content of 0.06% or more, iron ore having a zinc (Zn) content of 0.02% or more and an alkali oxide (K ₂ O + Na ₂ O) And one or more iron ores among the iron ores are mixed.

In the step of forming the mixture, the carbonaceous material is characterized in that at least one of the coal dust and the carbon dust generated in the steel process is mixed.

In the step of forming the mixture, the mixture has a basicity (CaO / SiO2) of 1 or more.

In the step of forming the mixture, the mixture is adjusted so that the content of the alkali oxide is 0.5% or more.

In the step of forming the mixture, an additive for controlling the basicity and the content of the alkali oxide is further mixed in the mixture, and CaO is used for controlling the basicity of the additive, and Na ₂ CO ₃ and K ₂ CO ₃ is used.

And the carbonaceous material is mixed in an amount of 10 parts by weight or more based on 100 parts by weight of the whole mixture.

Wherein the oxidizing atmosphere is maintained in the reducing furnace, wherein a gas generated by reduction by the carbon in the compacted light during the reduction of the compacted light surrounds the perimeter of the compacted light, So that the oxidizing atmosphere and the intense light are blocked.

Characterized in that in the step of reducing the compacted light in the open reduction furnace, the compacting temperature of the compacted light is 1000 DEG C or more, and the maximum value of the reduction time of the compacted light is limited until the carbon in the compacted light is completely consumed do.

In the reducing process of the compacted light in the open reduction reactor, zinc (Zn) contained in the compacted light is recovered as dust in the exhaust gas in a vapor phase, and recovered dust is converted into zinc oxide (ZnO) And a step of separating and recovering is further performed.

The vaporized zinc generated during the reduction of compacted light in the reduction furnace is discharged together with the exhaust gas, and the vaporized zinc (Zn) reacts with oxygen in the exhaust gas to produce zinc oxide (ZnO) ) Is contained in the dust and recovered.

And the alkali element is separated and recovered together with water while the recovered dust is shredded.

In the step of separating the reduced iron and the slag, the reduced iron and the slag are separated by the magnetic separator.

In another aspect, a reduced iron manufacturing method according to an embodiment of the present invention is characterized in that iron raw material and carbon material are mixed to form compacted light, and then the compacted light is reduced in an open reduction furnace to produce reduced iron.

Wherein the carbonaceous material is mixed with at least 10 parts by weight based on 100 parts by weight of the total massive light so that a gas generated by the reduction by the carbon in the intense light upon the reduction of the compacted light surrounds the perimeter of the compacted light, And the oxidizing atmosphere and the intense light are blocked.

Meanwhile, the apparatus for manufacturing reduced iron according to an embodiment of the present invention includes a plurality of raw hoppers for storing different kinds of iron ores; A carbonaceous hopper in which the carbonaceous material is stored; A mixer for mixing the raw material hopper and the different kinds of iron ores ejected from the carbonaceous material hopper and the carbonaceous material to form a mixture; A first molding machine for molding the mixture into compact light; An open type reducing furnace in an oxidizing atmosphere for reducing the intense light; A crusher for crushing the reduced material reduced in the reducing furnace; A magnetic separator for separating the pulverized reduced material into reduced iron and slag by magnetic force; And a second molding machine for molding the reduced iron.

A collecting device for collecting dust in the exhaust gas exhausted from the reducing furnace; And a water-quencher for separating zinc oxide (Zn) and alkaline-element-containing wastewater by regenerating the dust collected in the collector.

According to the embodiment of the present invention, there is an effect that a reduced iron can be mass-produced in an open type reducing furnace in an oxidizing atmosphere by utilizing iron ore, which is not used because of high impurity content in iron ore in the conventional ironmaking process.

In other words, when compacted light is formed using a mixture of iron ore and carbonaceous material premixed and reduced in a reducing furnace in an oxidizing atmosphere, compacted gas is surrounded by the reducing gas generated in the compacted light, It is possible to sufficiently reduce intense light even in an oxidizing atmosphere.

In addition, phosphorus (P), zinc (Zn), and alkaline oxides (K ₂ O + Na ₂ O), which are impurities contained in iron ore, K ₂ O + Na ₂ O) can be separated and recovered from the iron.

As a result, it is possible to reduce the cost of purchasing raw materials by widening the scope of the iron ore raw material target, and to reuse the phosphorus (P), zinc (Zn) and alkaline oxide (K ₂ O + Na ₂ O) .

FIG. 1 is a view schematically showing the construction of a reduced iron manufacturing apparatus and a reduced iron manufacturing method according to an embodiment of the present invention,
FIG. 2 is a graph showing the relationship of yield of slag in slag according to basicity after reducing intense light at 1200 ° C for 20 minutes,
FIG. 3 is a graph showing the relationship between the yield of slag in slag according to the content of alkali oxide in the intrinsic light after reducing intense light having a basicity of 1 at 1200 ° C for 20 minutes,
FIG. 4 is a graph showing the metallization ratio of the intense light according to the temperature and the mixing amount of the carbonaceous material in the open type reducing furnace.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

For a better understanding of the present invention, an apparatus for manufacturing reduced iron according to an embodiment of the present invention will be described first.

FIG. 1 is a view schematically showing a configuration of a reduced iron manufacturing apparatus and a reduced iron manufacturing method according to an embodiment of the present invention.

As shown in the drawing, the apparatus for manufacturing reduced iron according to an embodiment of the present invention includes a first crusher 11 for crushing iron ore; A plurality of raw material hoppers 21, 22, and 23 for storing the iron ores crushed in the first crusher 11 by different types; A second crusher 12 for crushing the carbonaceous material such as coal; A carbonaceous hopper 30 in which the carbonaceous material crashed in the second crusher 12 is stored; A mixer 50 for mixing the raw material hoppers 21, 22, and 23 and the different types of iron ores ejected from the carbonaceous material hopper 30 to form a mixture; A first molding machine (61) for molding the mixture into compacted light; An open type reducing furnace (70) of oxidizing atmosphere for reducing the intense light; A third crusher 13 for crushing the reduced material reduced in the reducing furnace 70; A magnetic separator 80 for separating the pulverized reduced material into reduced iron and slag by a magnetic force; And a second molding machine 62 for molding the reduced iron. And one or more additive hoppers (40) for storing subsidiary materials; A collector (90) for collecting dust in the exhaust gas exhausted from the reduction furnace; And a water quencher 100 for separating the dust collected in the collector 90 and separating the zinc oxide (Zn) and the alkali element-containing wastewater.

The open reduction furnace 70 is a reduction furnace which is opened without being hermetically closed, and various types of reduction furnaces can be applied as long as they can heat compacted light while continuously conveying the compacted light. For example, to describe an open reduction furnace, there is provided a conveying means for conveying the coarse light in a conveyor manner. In addition, a furnace body is formed in the upper portion of the conveying means to surround a region to which the intense light is to be transferred to form a reduced space. A plurality of burners are provided in the furnace body to heat the inside of the furnace body. Suction means for sucking in air inside the furnace body is provided at a lower portion of the conveying means. Thus, as the intense light is conveyed by the conveying means, heat is supplied from the top of the intense light to the downward direction by burning the burner and suction of the suction means in the furnace body. By using the open reduction furnace in this way, it is possible to laminate multi-layered light with a large number of layers, and it is possible to continuously perform reduction, thereby producing a large amount of reduced iron.

On the other hand, the first molding machine 61 and the second molding machine 62 use a twin roll molding machine.

Next, a manufacturing method of reduced iron using the reduced iron manufacturing apparatus constructed as above will be described.

As shown in FIG. 1, various kinds of iron ores are crushed in the first crusher 11, and the iron ores are divided into a plurality of iron material hoppers 21, 22, and 23 according to respective types. The iron ore to be used at this time is iron ore having a phosphorus (P) content of 0.06% or more, iron ore having a zinc (Zn) content of 0.02% or more, and iron ore having an alkali oxide (K ₂ O + Na ₂ O) content of 0.1% or more. Of course, phosphorus, zinc and alkali oxides may be contained in more than one iron ore.

Then, the carbonaceous material containing carbon is crushed in the second crusher 12 and stored in the carbonaceous material hopper 30. Here, the carbonaceous material may be a mixture of at least one of the coal dust and the carbon dust generated in the steel process. At this time, it is preferable to limit the particle size of the carbonaceous material to 0.1 mm or less in order to improve the reactivity.

In addition, the auxiliary raw material hopper 40 is separately stored with a basicity controlling raw material and an alkaline oxide content adjusting raw material separately or separately. For example, CaO is used as an additive for controlling the basicity, and Na ₂ CO ₃ and K ₂ CO ₃ are used as additives for adjusting the alkali oxide content.

When the iron ore, the carbonaceous material and the subsidiary material are prepared as described above, they are individually kneaded and charged into the mixer 50, followed by mixing to form a mixture.

At this time, the mixture preferably contains 0.06% or more phosphorus (P), 0.02% or more of zinc (Zn), and 0.1% or more of an alkali oxide (K ₂ O + Na ₂ O) . However, it is preferable to maintain the intense light in a highly salted air and a highly alkaline state in order to sufficiently separate the phosphorus when reducing the intense light, which will be described later. Accordingly, it is preferable to mix CaO, Na ₂ CO _3, and K ₂ CO ₃ in an appropriate amount in order to adjust the basicity (CaO / SiO ₂ ) of the mixture to 1 or more while adjusting the content of the alkali oxide to 0.5% or more . The reasons for limiting the basicity and the content of the alkali oxide will be described later with reference to FIG. 2 and FIG.

When the mixture is formed with the above conditions, the mixture is put into the first molding machine 61 and molded into a uniform size light of a certain size.

Then, the molded compacted light is charged into the open reduction furnace 70 to reduce iron (Fe) in the intense light under the oxidizing atmosphere, and phosphorus, zinc and alkali elements contained in the intense light are separated. Here, the oxidative atmosphere means that the atmosphere is exposed to the atmosphere without adjusting the atmosphere.

In addition, iron (Fe) and carbon monoxide (CO) are generated by reaction (reduction) with carbon in the intense light as shown in the following chemical formula (1). At this time, CO generated is reacted with iron oxide in the intense light as shown in the following Chemical Formula ₂ to generate iron (Fe) and CO ₂ . On the other hand, CO ₂ generated at this time is also converted into CO by reacting with carbon in the intense light. The CO gas and the CO ₂ gas generated by the reaction between the iron oxide and the carbon in the coarse light are discharged to the outside of the coarse light to form a gas film surrounding the periphery of the coarse light. Since this gas film serves to block the oxidizing atmosphere and the intense light in the open reduction furnace 70, the reduction of the compacted light is smoothly performed in the open reduction furnace 70.

In this case, it is preferable that sufficient carbon is contained in the intense light so that the reaction between iron oxide and carbon is sufficiently performed in the intense light so that the gas film is sufficiently formed. Accordingly, in the present embodiment, it is preferable to limit the content of the carbonaceous material to 10 parts by weight or more based on 100 parts by weight of the total mixture.

In addition, it is preferable to maintain the firing temperature in the open-type reduction furnace 70 at 1000 ° C or higher in order to reduce intense light in the open-type reduction furnace 70.

FIG. 4 is a graph showing the metallization ratio of compacted light according to the mixing ratio of the temperature and the carbonaceous material in the open reduction furnace. It can be confirmed that the compacted material containing at least 10 parts by weight of carbonaceous material is metallized smoothly at 1000 ° C or higher.

Also, it is preferable that the maximum value of the reduction time of the compacted light is limited to the time before the carbon in the compacted light is completely consumed because the carbon in the compacted light must react to form a gas film.

Thus open during the reducing furnace 70 is composed of the compacted light reduction, phosphorus (P) is reacted with oxygen (O) and CaO in the compacted optical slag in the form, such as CaO · (P ₂ O ₅₎ contained in the compacted light . So, it is mixed with reduced iron and slag.

The zinc contained in the intense light, that is, the zinc oxide and the alkali oxide (K ₂ O + Na ₂ O) is first reduced at a lower temperature than the iron oxide and discharged together with the exhaust gas.

At this time, the vaporized zinc (Zn) generated during the reduction of the coarse light is discharged together with the exhaust gas so that oxygen in the exhaust gas reacts to generate zinc oxide (ZnO). The zinc oxide (ZnO) Collected.

In addition, the vaporized alkali element generated upon reduction of the compacted light is discharged together with the exhaust gas, so that oxygen in the exhaust gas reacts to generate an alkali acid again, and the alkali oxide is also contained in the dust and is collected by the collector 90.

The dust collected in the collector 90 is subjected to water treatment in the water shredder 100 to recover the zinc oxide and the alkali-containing wastewater to be recycled.

On the other hand, the compacted iron mixed with the reduced iron and the slag is crushed in the third crusher 13 and separated by the magnetic separator 80 by magnetic force to separate the reduced iron and the slag. Thus, the separated reduced iron is again molded into briquettes of a certain size in the second molding machine 62, and the slag having a high content of CaO and phosphorus is recycled as raw material for fertilizer.

[Example]

The following examples illustrate the present invention.

The chemical composition of each iron ore used in the experiment is shown in Table 1.

Iron ores with high content of phosphorus, zinc and alkali (Na ₂ O, K ₂ O) were used. Briquettes of high phosphorous, zinc and alkali contents were prepared by mixing iron ores. In addition, reagent grade zinc oxide, phosphorus oxide and alkaline oxides were added to maximize the zinc, phosphorus and alkali contents.

As a comparative example, the chemical composition of the iron ore (iron ore C) generally used in the steel making process is shown simultaneously as shown in Table 1. As shown in Table 1, iron ore C generally used in the ironmaking process is about 0.06% or less for phosphorus, about 0.02% or less for zinc and 0.03% or less for alkaline oxide. However, in case of iron ore A and iron ore B Phosphorus, zinc and alkaline oxides are relatively high.

division T.Fe SiO ₂ Al ₂ O ₃ CaO MgO P Zn K ₂ O Na ₂ O Iron ore A 41.1 17.8 2.41 3.20 13.7 0.013 0.103 0.687 - Iron ore B 55.3 8.5 0.90 4.38 0.21 0.52 0.019 0.039 0.10 Iron ore C 65.7 1.87 1.19 0.01 0.09 0.023 0.009 0.036 0.012

Briquettes were prepared by mixing the iron ores A and B with coal (20 wt%). To regulate the basicity (CaO / SiO ₂ ) and alkaline oxide contents, reagent grade CaO, K ₂ O, Na ₂ O . The brittle reduction test was performed under the reducing furnace condition.

Zn, P, and Fe in slag, Fe, Zn, P, K, Na in the briquettes were analyzed under the inert gas atmosphere at a reduction temperature of 1200 ℃, a heating rate of 50 ℃ / Respectively.

FIG. 2 is a graph showing the relationship of yield of slag in slag according to the basicity after reducing the intense light at 1200 ° C for 20 minutes, and FIG. 3 is a graph showing the relationship between the alkaline oxide content Fig. 7 is a graph showing the relationship of the yield of slag; Fig.

As can be seen from FIG. 2, the yield of slag was slightly increased with increasing basicity. Phosphoric acid (P ₂ O ₅ ) is stabilized as an oxide under highly salted air condition, and it is known that phosphorus in slag is stabilized even when a small amount of strong basic oxide such as alkaline oxide is added. Therefore, it can be seen that it is effective to add a small amount of high-salt air-entrained slag and alkali oxide to prevent phosphorus oxide from being reduced in the reduction process of iron oxide and dissolving in metal Fe and to remain in slag.

After the test, the reduction rate of briquettes was about 85 ~ 90% without being affected by basicity. It is also found that the zinc content in the slag decreased from 0.1% to 0.004% after the reduction. In the case of zinc oxide, it was reduced at lower temperature than iron oxide to become metal Zn. In the case of zinc, it showed high vapor pressure and was vaporized into gaseous Zn simultaneously with reduction, and it was reoxidized in exhaust gas and exhausted to ZnO.

As can be seen from FIG. 3, the yield of the slag was increased at the same time as the content of alkali oxide in the briquet was increased. Therefore, it can be seen that the use of a mixture of an ore having a high alkali oxide content and an ore having a high phosphorus content is advantageous for improving the yield of slag in the slag. Therefore, it was confirmed that when the basicity (CaO / SiO ₂ ) of the mixture was adjusted to 1 or more and the content of alkali oxide was adjusted to 0.5% or more, phosphorus could be recovered to a desired level or higher.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

11, 12, 13: crusher 21, 22, 23: raw hopper
30: Carbon hopper 40: Substrate hopper
50: mixer 61, 62: molding machine
70: open reduction furnace 80: magnetic separator
90: Collector 100: Dispenser

Claims (18)

Mixing the iron raw material containing phosphorus, zinc and alkali oxides with the carbonaceous material to form a mixture;
Molding the mixture into compacted light;
Separating the phosphorus, zinc and alkali elements contained in the intense light while reducing the intense light in the open reduction reactor;
Crushing the reduced material with the compacted light and separating the reduced material into slag containing reduced iron and phosphorus;
Wherein the reduced iron is compacted, and the slag is recovered.
The method according to claim 1,
In the step of forming the mixture,
Wherein the mixture contains not less than 0.06% of phosphorus (P), not less than 0.02% of zinc (Zn) and not less than 0.1% of alkali oxide (K ₂ O + Na ₂ O).
The method of claim 2,
In the step of forming the mixture,
The iron raw material is a mixture of iron ore having a phosphorus (P) content of 0.06% or more, iron ore having a zinc (Zn) content of 0.02% or more, and iron ore having an alkali oxide (K ₂ O + Na ₂ O) .
The method according to claim 1,
In the step of forming the mixture,
Wherein the carbonaceous material is a mixture of at least one of carbon and dust generated in a steel process.
The method according to claim 1,
In the step of forming the mixture,
The mixture basicity (CaO / SiO ₂₎ is 1 or more reduced iron production method.
The method according to claim 1,
In the step of forming the mixture,
Wherein the mixture is adjusted so that the content of alkali oxide is 0.5% or more.
The method according to claim 5 or claim 6,
In the step of forming the mixture,
The mixture is further mixed with an additive for controlling the basicity and the content of the alkali oxide,
Wherein the additive is CaO for controlling the basicity and Na ₂ CO ₃ and K ₂ CO ₃ are used for controlling the alkali oxide content.
The method according to claim 1,
Wherein the carbonaceous material is mixed in an amount of 10 parts by weight or more based on 100 parts by weight of the total mixture.
The method according to claim 1,
In the step of reducing the intense light in the open reduction reactor,
The oxidizing atmosphere is maintained in the reducing furnace,
Wherein the gas generated by reduction by the carbon in the intense light during the reduction of the intense light forms a gas film around the intense light to block the oxidizing atmosphere and the intense light.
The method of claim 9,
In the step of reducing the intense light in the open reduction reactor,
The firing temperature of the intruding light is 1000 DEG C or more,
Wherein the maximum value of the reduction time of the compacted light is limited until the carbon (C) in the compacted light is completely consumed.
The method according to claim 1,
In the step of reducing the intense light in the open reduction reactor,
Wherein zinc in the reducing furnace is recovered as dust in the exhaust gas in a gaseous phase and the recovered dust is recovered and recovered into zinc oxide (ZnO).
The method of claim 11,
The vaporized zinc generated during the reduction of compacted light in the reduction furnace is discharged together with the exhaust gas, and the vaporized zinc (Zn) reacts with oxygen in the exhaust gas to produce zinc oxide (ZnO) ) Is recovered in the dust.
The method of claim 11,
Wherein the alkali element is separated and recovered along with water while the recovered dust is shredded.
The method according to claim 1,
In the step of separating into reduced iron and slag,
Wherein the reduced iron and the slag are separated by a magnetic separator.
A method of manufacturing a carbon fiber composite material, comprising the steps of: forming compacted light by mixing an iron raw material and a carbonaceous material; and reducing the compacted light in an open type reducing furnace in an oxidizing atmosphere to generate a gas generated by reduction by the carbon in the compacted light upon the reduction of the compacted light, And forming a gas film to block reduced oxidizing atmosphere and intense light in the open reduction reactor, thereby producing reduced iron.
16. The method of claim 15,
Wherein the carbonaceous material is mixed in an amount of 10 parts by weight or more per 100 parts by weight of the total massive light.
An apparatus for producing reduced iron,
A plurality of raw hoppers for storing different types of iron ores;
A carbonaceous hopper in which the carbonaceous material is stored;
A mixer for mixing the raw material hopper and the different kinds of iron ores ejected from the carbonaceous material hopper and the carbonaceous material to form a mixture;
A first molding machine for molding the mixture into compact light;
An open type reducing furnace in an oxidizing atmosphere for reducing the intense light;
A crusher for crushing the reduced material reduced in the reducing furnace;
A magnetic separator for separating the pulverized reduced material into reduced iron and slag by magnetic force;
A second molding machine for molding the reduced iron;
A collecting device for collecting dust in the exhaust gas exhausted from the reducing furnace;
And a shredder for separating the zinc oxide (Zn) and the alkaline-element-containing wastewater by shredding the dust collected in the collector.
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