CN103154276A - Process for production of reduced iron - Google Patents
Process for production of reduced iron Download PDFInfo
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- CN103154276A CN103154276A CN2011800491506A CN201180049150A CN103154276A CN 103154276 A CN103154276 A CN 103154276A CN 2011800491506 A CN2011800491506 A CN 2011800491506A CN 201180049150 A CN201180049150 A CN 201180049150A CN 103154276 A CN103154276 A CN 103154276A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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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
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
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- Manufacture Of Iron (AREA)
Abstract
This process for producing reduced iron comprises: a kneading step of adding water having a temperature of 60-90 DEG C inclusive to a mixture comprising a powdery iron oxide raw material and a powdery reducing material and kneading the resulting mixture; a granulation step of granulating the mixture obtained in the kneading step to produce a granulated material; and a reduction step of reducing the granulated material obtained in the granulating step to produce reduced iron.
Description
Technical field
The present invention relates to the manufacture method of reduced iron.
The application here cites its content based on advocating right of priority No. 2010-231512 in the Japanese Patent Application of Japanese publication on October 14th, 2010.
Background technology
The stove dirt take ferrous components as main component that will smelt iron, produce in blast furnace, converter, electric furnace or smelting furnace etc. in steel process processed recycles as raw material.
For the solid iron content cold burden that above-mentioned stove dirt is such is used as raw material, proceed as follows: the collected raw iron oxide material as solid iron content cold burden is mixed with reducing material, carry out on this basis mixing, pass through into afterwards the blocking processing and make into the blocking thing, then by this being become the blocking thing also originally made reduced iron (for example with reference to following patent documentation 1).
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2009-97065 communique
Summary of the invention
Invent problem to be solved
Yet, in the manufacture method of the reduced iron as described in above-mentioned patent documentation 1, when being implemented as the granulating working procedure that blocking processes, sometimes the mixture of raw material is not become blocking and residual powder fully, this can become problem when wanting further to improve granulation.
The present invention completes in view of the above problems, the object of the present invention is to provide the manufacture method that can further improve the reduced iron of granulation when the mixture as the raw material of reduced iron is become blocking.
For the means of dealing with problems
In order to address the above problem, the present invention adopts following scheme.
(1) namely, the manufacture method of the reduced iron of a scheme of the present invention comprises following operation: mixing operation, add more than 60 ℃ to the mixture that comprises the raw iron oxide material that is powdery and reducing material in this operation and the moisture below 90 ℃ and carry out mixing; Granulating working procedure becomes the said mixture after above-mentioned mixing operation blocking and makes into the blocking thing in this operation; With the reduction operation, in this operation, the above-mentioned one-tenth blocking thing reduction after above-mentioned granulating working procedure is generated reduced iron.In the present invention, said moisture comprises water and steam.
(2) in the above-mentioned mixing operation in above-mentioned (1) described scheme, also can further add the tackiness agent that dissolves in above-mentioned moisture to said mixture.
(3) in the situation that above-mentioned (2), above-mentioned tackiness agent can be liquid organic system tackiness agent or pulverous organic system tackiness agent.
(4) in the situation that above-mentioned (3), above-mentioned tackiness agent is above-mentioned pulverous organic system tackiness agent, and above-mentioned tackiness agent can be for being selected from the starch of the cereal in rice, cassava, rye and corn.
(5) in the above-mentioned mixing operation in above-mentioned (1) described scheme, also can be by the interpolation of above-mentioned moisture, the moisture containing ratio that makes said mixture is 6%～9%.
(6) in the above-mentioned mixing operation in above-mentioned (1) described scheme, the particle diameter of mixing said mixture before can be as 70 μ m～500 μ m to sieve down 80% particle diameter.
(7) in the above-mentioned mixing operation in above-mentioned (1) described scheme, the moisture containing ratio of the said mixture before the above-mentioned moisture of interpolation can be 1%～3%.
The invention effect
According to such scheme of the present invention, owing to adding more than 60 ℃ and the moisture below 90 ℃ to this mixture with the mixture pelleting that contains raw iron oxide material and reducing material the time, so can realize the homogenizing of the moisture in said mixture, thereby can further improve the granulation in granulating working procedure.
Description of drawings
Fig. 1 is the explanatory view for an example of the manufacturing process of explanation reduced iron.
Fig. 2 is the schema for each operation of the manufacture method of the reduced iron of explanation an embodiment of the invention.
Fig. 3 means that moisture soaks into the chart of needed time to mixture.
Fig. 4 means the chart of the ratio that is present in the block in mixture.
Fig. 5 means that W-Gum is with respect to the chart of the variation of the dissolving ratio of moisture.
Fig. 6 means into the blocking thing at the chart of the variation of dried intensity.
Embodiment
Below, with reference to accompanying drawing, an embodiment of the invention are elaborated.In addition, below the explanation in said moisture comprise water and steam.
＜about the manufacturing process of reduced iron＞
Before the manufacture method to the reduced iron of present embodiment describes, with reference to Fig. 1, the manufacturing process of reduced iron is elaborated.Fig. 1 is the explanatory view for an example of the manufacturing process of explanation reduced iron.
The reducing materials such as the raw iron oxide material such as the iron-smelting furnace dirt that will collect from each equipment of iron work in advance and come or iron ore and coal, coke, particulate carbon are accommodated in hopper 11 etc.Raw iron oxide material and reducing material are coordinated the pulverizer 13 of then packing into pre-set proportioning.
Pulverizer 13 limits take vibrating mills such as ball mills as representative are crushed to the raw iron oxide material of being packed into and reducing material mixing limit the particle diameter of regulation.Raw iron oxide material after pulverizing and the particle diameter of reducing material are suitably set according to the value of the reduction furnaces such as the rotary oven pool furnace that is suitable for using in the manufacturing of reduced iron or rotary kiln and are got final product.The mixture that is made of the raw iron oxide material after pulverizing and reducing material is carried to mixing roll 15.
Mixing roll 15 receive by pulverizer 13 pulverize be regulation particle diameter mixture and carry out mixing.In addition, 15 pairs of mixtures of mixing roll carry out when mixing, in most cases, implement mixture is added the damping of water and process, until reach the amount of moisture that reduction furnace was fit to of packing into for the manufacture of reduced iron.As an example of mixing roll 15, can enumerate mixer-mill, can also utilize multiple mixing roll outside it.Utilize the mixing mixture that obtains of mixing roll 15 to be carried to forming machine 17.
Forming machine 17 receptions as pan-type pelletizer (dish-type granulators), double roller compressor (briquetting press), extrusion shaping machine etc. contain the mixture of raw iron oxide material and reducing material and carry out moulding, for example the such one-tenth blocking thing of granulation or agglomerate.Wherein, become the blocking thing to refer to particle, agglomerate, extrusion moulding and the severing products formed that obtains, block even-granular thing, the block that adjustment obtains through granularity.Forming machine 17 becomes blocking with said mixture after drying described later, heat reduction, the size that can not disperse because of upstream in stove when for example at high temperature packing smelting furnace 23 into to become.The one-tenth blocking thing that generates is loaded into drying machine 19.
The one-tenth blocking thing that 21 pairs such of reduction furnaces such as rotary oven pool furnace (Rotary Hearth Furnace:RHF) or rotary kiln are packed into heats and reduces by the heating atmosphere of having used LNG burner or COG burner etc., makes reduced iron.Reduction furnace will be by becoming the blocking thing for example to be heated to 1000～1300 ℃ of left and right to becoming the blocking thing to reduce processings, the manufacturing reduced iron.The reduced iron that manufacturing obtains is carried to smelting furnace 23.
Smelting furnace 23 will such as the reduced iron fusing of being supplied with by reduction furnace 21 with states such as high-temperature particles, be made molten iron.The molten iron that generates in smelting furnace 23 is like this carried with casting ladle etc., implemented desulfurization, refining treatment, then as crude molten steel.
＜about the manufacture method of reduced iron＞
Based on above explanation, the below is elaborated to the manufacture method of the reduced iron of present embodiment.
［ summary of the manufacture method of the reduced iron of present embodiment ］
The manufacture method of the reduced iron of present embodiment as mentioned above, by to the mixed oxidization iron material with reducing material and moulding obtains becomes the blocking thing to heat, reduce processing, make reduced iron.As the raw iron oxide material of present embodiment, can from iron-smelting furnace dirt (such as iron content cold burden fusing with converter, refining with converter and the fusing of stove dirt with generation converter etc. and converter dust, blast furnace dust, expanded skin (mill scale) or the electric arc furnace dust etc. that are obtained by controls of dust such as wet dust collection devices), suitably selection in non-iron smelting furnace dirt and iron ore.In addition, as the reducing material of present embodiment, such as using the carbon materials such as coal, coke or particulate carbon such as fine coal.
Here, in the manufacturing process of the reduced iron of present embodiment, when having used the granulating working procedure of tablets press, sometimes the mixture of raw material is not become blocking fully and can residual powder.The residual granulation raising that can hinder in granulating working procedure of such powder.Therefore, the inventor conducts in-depth research as purpose take the granulation that improves in granulating working procedure, found that when granulating working procedure, is more than 60 ℃ and the moisture below 90 ℃ by add temperature in the mixture of raw material, can make the granulation raising in granulating working procedure.
As following detailed explanation as can be known, the result that the inventor studies is, found by utilizing more than 60 ℃ in granulating working procedure and the moisture below 90 ℃, surface tension reduces, wetting ability increases, and the motion of molecule comes to life, the intermolecular repulsion that becomes, moisture is improved the impregnability of the mixture that comprises raw iron oxide material and reducing material, thereby moisture is improved to the diffuser efficiency of mixture tremendously.By the raising of such diffuser efficiency, can make the distribution that is present in the moisture in the mixture that comprises raw iron oxide material and reducing material more even than in the past, the granulation raising in the time of can making granulation.
In addition, the result that the inventor studies is, found that by utilizing temperature when the granulating working procedure be more than 60 ℃ and the moisture below 90 ℃, not only can make the granulation raising, and the strength ratio of the one-tenth blocking thing of manufacturing is improved in the past more.In the manufacture method of illustrated before reduced iron, for the intensity that makes into the blocking thing improves, the mixture that is made of oxide raw material and reducing material has been carried out the interpolation of various tackiness agents.Yet, as the manufacture method of the reduced iron of present embodiment, be more than 60 ℃ and the moisture below 90 ℃ by add temperature in the mixture in granulating working procedure, moisture is improved to the diffuser efficiency of mixture tremendously, thereby moisture moment is impregnated into more depths, therefore the intensity of the one-tenth blocking thing of manufacturing is further improved.In addition, except adding more than 60 ℃ and the moisture below 90 ℃, mixture is further added tackiness agent in granulating working procedure, the intensity of the one-tenth blocking thing of manufacturing is further improved.
［ flow process of the manufacture method of the reduced iron of present embodiment ］
Below, with reference to Fig. 2, an example based on the flow process of the manufacture method of the reduced iron of the present embodiment of above-mentioned opinion is elaborated.Fig. 2 means the schema of flow process of manufacture method of the reduced iron of present embodiment.
In the manufacture method of the reduced iron of present embodiment, at first, mix (step S101) with reducing material with being selected from the iron-smelting furnace dirt and the raw iron oxide material in iron ore that produce in iron manufacturing process, and from hopper 11 pulverizer 13 of packing into.As the fine coal as above-mentioned reducing material, for example can use lower 80% particle diameter of sieve is the fine coal of 8～12% left and right as 5mm～10mm left and right and moisture containing ratio.In addition, mixing ratio about raw iron oxide material and reducing material, adjust although consider to be suitable for to obtain the condition of good reduced iron in reduction operation described later, the mass ratio of raw iron oxide material and reducing material is as being the 90:10 left and right.When being loaded into pulverizer, this mixture for example has the particle diameter of 4mm left and right.
Then, utilize pulverizer 13 to be crushed to for example particle diameter of 70 μ m～500 μ m (lower 80% particle diameter of sieve) in the mixture of raw iron oxide material and reducing material, preferred powder is broken to the particle diameter (step S103) of 150 μ m～300 μ m.Be 70 μ m～500 μ m by the particle diameter that makes mixture, the deviation that can make degree of metalization little (for example 6% left and right is following) and the high reduced iron of degree of metalization are 70 μ m by the lower value that makes particle diameter, can be suppressed to the explosion in the reduction operation of blocking thing.In addition, be 150 μ m～300 μ m by the particle diameter that makes mixture, can make deviation minimum (for example 3% left and right is following) and the high reduced iron of degree of metalization of degree of metalization, be 150 μ m by the lower value that makes particle diameter, can avoid into the explosion in the reduction operation of blocking thing.
In addition, in this pulverizing process (step S103), the moisture containing ratio of the mixture that preferably will be made of raw iron oxide material and reducing material is adjusted into approximately 1%～3% left and right.By being made as described moisture containing ratio, can keep good mixing property in mixing operation described later.
As the pulverizer of ground mixt, such as using the vibrating mills such as ball mill or rod mill.For the outlet side at vibrating mills such as ball mills, the particle diameter of mixture is made as above-mentioned scope, and the moisture containing ratio of mixture is made as approximately 1%～3%, suitably set the processing speed that is used for the ball mill pulverized etc. and get final product.For example, at first from calculating comminution ratio in the target value of the particle diameter of the outlet side of vibrating mill (ball mill) with at the particle diameter of the inlet side of vibrating mill.Then, the comminution ratio that can calculate by utilization and decide the processing speed of vibrating mill as the moisture containing ratio of the outlet side of patent documentation 1 described vibrating mill at the grindability theoretical curve of the vibrating mill at target value place.
In addition, in the manufacture method of the reduced iron of present embodiment, by dry raw iron oxide material before mixing, the moisture containing ratio of the mixture in the time of pulverizer can being packed into remains vibrating mill and shows suitable smashing value, thereby does not need constantly to change the control of the vibrating mill when pulverizing.In addition, even the moisture containing ratio of raw iron oxide material because a variety of causes and the setting of drying machine 12 is suitably controlled in fluctuation up and down during by dry before mixing, also can maintain vibrating mill comminuted suitable value.
When the pulverizing of mixture finishes, with the pulverized mixture mixing rolls 15 such as mixer-mill of packing into, so that reaching the mode that is suitable for mixing value (for example 6～9% left and right), the moisture containing ratio adds water, then carry out mixing (step S105).In addition, during compounding mixture, for the raising of the intensity of the one-tenth blocking thing of realizing manufacturing, also can add to mixture the tackiness agent of regulation.
Wherein, as before illustrated, in the manufacture method of the reduced iron of present embodiment, in order to adjust the moisture containing ratio of mixture, utilize to have more than 60 ℃ and the moisture of the temperature below 90 ℃.By utilizing such moisture, moisture is improved the impregnability of mixture, thereby moisture is improved to the diffuser efficiency of mixture tremendously.Consequently, can make the moisture that is present in mixture more even, thus the granulation raising when making granulation.
In addition, in the manufacture method of the reduced iron of present embodiment, by utilizing more than 60 ℃ and the moisture below 90 ℃ in the wet treatment that adds that is used for adjustment moisture containing ratio, not only can make the granulation raising, and the intensity of the one-tenth blocking thing of manufacturing is improved tremendously.Therefore, according to the manufacture method of the reduced iron of present embodiment, can realize the enhancing of intensity of the one-tenth blocking thing of manufacturing under the condition of the amount of the tackiness agent that does not increase interpolation.
As long as the tackiness agent that uses in mixing operation dissolves in more than 60 ℃ and the moisture below 90 ℃, can use any tackiness agent.As such tackiness agent, can enumerate liquid organic system tackiness agent and pulverous organic system tackiness agent.Example as liquid organic system tackiness agent has molasses, xylogen etc.In addition, as the example of pulverous organic system tackiness agent, the starch of the cereal such as rice, cassava, rye, corn (grain) etc. is arranged.Among these organic system tackiness agents, when needed moisture and tackiness agent, viscosity increases, thereby can't mix well in mixing operation in the mode of adding with slurry has been added mixing operation, therefore than liquid tackiness agent, more preferably pulverous tackiness agent.Organic system gasification when reduction also helps to strengthen reduction, therefore particularly preferably utilizes pulverous organic system tackiness agent.
Dissolve in more than 60 ℃ and the tackiness agent of the moisture below 90 ℃ by utilization, tackiness agent itself improves with the solvability of moisture, consequently, the dispersion efficiency of tackiness agent is improved.Consequently, tackiness agent itself spreads all over the integral body of mixture, thereby the intensity of the one-tenth blocking thing of manufacturing is further improved.
In addition, on the basis of above-mentioned organic system tackiness agent, can also further add cement, wilkinite, flyash etc. inorganic be tackiness agent.
Wherein, about the amount of the tackiness agent that adds in mixture, add manyly, more can realize the intensity enhancing of the one-tenth blocking thing of manufacturing, but the viewpoint from manufacturing cost etc. with respect to the total mass of mixing mixture, preferably is made as below 2% when drying.
When the mixing end that utilizes mixing roll 15 to carry out, mixture is loaded into as forming machines 17 such as pan-type pelletizer (dish-type granulators), double roller compressor (briquetting press), extrusion shaping machines and carries out granulation (step S107), is formed into the blocking thing.
The one-tenth blocking thing that generates is carried out drying treatment by drying machine 19, make the moisture containing ratio be for example (step S109) below 1%.One-tenth blocking thing after dry the end is loaded into the reduction furnaces 21 such as RHF, implements reduction and processes.The one-tenth blocking thing of present embodiment not only shows good granulation but also shows good ultimate compression strength by using more than 60 ℃ and the moisture below 90 ℃ in mixing operation.Therefore, breaking of the interior one-tenth blocking of reduction furnace 21 thing lacked in the reduction operation, can fully be reduced into the blocking thing.For example, when using RHF as reduction furnace 21, for example can be with the Temperature Setting in reduction furnace 21 1350 ℃ of left and right, and set the speed of rotating bed approximately to complete mode that reduction processes in 15 minutes.Process by carrying out above-mentioned reduction, can make efficiently the reduced iron that is difficult for breaking and has high degree of metalization.
As discussed above, the manufacture method according to the reduced iron of present embodiment not only can realize the raising of the granulation in granulating working procedure, and can make the reduced iron that is difficult for breaking and has high degree of metalization.Therefore, reduced iron fusing is improved with the unit oxygen-consumption of converter, and further the productivity of molten iron be maintained higher level.
Embodiment
Below, enumerate embodiment and comparative example, the manufacture method of reduced iron of the present invention is further described.Wherein, embodiment shown below is only an object lesson of the present invention, and the present invention is not limited in embodiment shown below.
In the embodiment and comparative example of following explanation, according to program shown in Figure 2, become the manufacturing of blocking thing.Wherein, in pulverizing process (step S103), the use ball mill (diameter * length: 3.3m * 6.0m, input amount: 40 tons/hour, capacity motor: 700KW, ball: 49 tons), in mixing operation (step S105), use mixer-mill.In addition, in granulating working procedure (step S107), use double roller compressor, in drying process (step S109), use conveyor dryer.
In addition, in the embodiment and comparative example of following explanation, use the iron work stove dirt that contains converter dust and blast furnace dust as raw iron oxide material, use coal as reducing material.In addition, in following illustrated embodiment and comparative example, raw iron oxide material and reducing material are made mixture with the mass ratio mixing of 87:13.The particle diameter of mixture is counted below 300 μ m to sieve down 80% particle diameter.In addition, mixing operation add water treatment, add moisture take the moisture containing ratio as 8.0% mode.In following example, the temperature of the moisture that the difference of embodiment and comparative example has been to use in mixing operation.
［ penetration period that soaks into to mixture about moisture ］
The variation of the penetration period that at first, with reference to Fig. 3, moisture is soaked into to mixture describes.
With regard to the penetration period that soaks into to mixture with regard to moisture, take 20g with aforementioned proportion mixed oxidization iron material and reducing material and obtain add water and mixing before mixture after, when this mixture was added that to be equivalent to the moisture containing ratio be 8% moisture, the time that the moisture that adds by instrumentation soaks into till mixture was fully measured the penetration period that moisture soaks into to mixture.Here, the temperature of the moisture that adds is made as 0 ℃, 15 ℃, 60 ℃, 80 ℃ and 90 ℃ these 5 kinds, in Fig. 3, the time till expression is soaked into fully take the moisture of 15 ℃ is the relative time of benchmark.
With reference to Fig. 3 as can be known, when having added the moisture of 0 ℃ in frozen water, compare with the situation of having added the moisture of 15 ℃, moisture increases to the penetration period that mixture soaks into.In addition, when having added the moisture of 60 ℃, 80 ℃ and 90 ℃, compare with the situation of adding the moisture of 15 ℃ as can be known, moisture reduces to the penetration period that mixture soaks into, and the temperature of moisture is higher, and penetration period more reduces.As shown in Figure 3 as can be known, by add the moisture of 90 ℃ in mixture, compare with the situation of adding the moisture of 15 ℃, moisture soaked into 60% time, moisture can be cut down 40% to the penetration period that mixture soaks into.Thus, by adding more than 60 ℃ and the moisture below 90 ℃ (being the moisture of 60 ℃, 80 ℃ and 90 ℃ in this example), can significantly cut down the penetration period that moisture soaks into to mixture in mixture.
［ about the ratio that exists of block ］
Then, with reference to Fig. 4, the variation that (and before granulation) after mixing is present in the ratio of the block in mixture describes.Wherein, in the following description, the particle diameter that " block " left behind when being illustrated in the screening mixture is the above piece of 5mm.In the present embodiment, take the mixture of the moisture that is added with 15 ℃, 60 ℃, 80 ℃ and 90 ℃ these 4 kinds of temperature mixing rear (and before granulation), then sieve, instrumentation has the gross weight of the block that contains moisture of the above particle diameter of 5mm.In Fig. 4 expression take in the situation that added in mixing operation temperature as the weight of the block of the moisture of 15 ℃ the ratio during as benchmark.
As can be seen from Figure 4, be the moisture of 60 ℃, 80 ℃ and 90 ℃ by utilize temperature in mixing operation, block have ratio with the moisture that utilized 15 ℃ the time compare minimizing, and the temperature of moisture is higher, the minimizing degree that has ratio of block is larger.In addition, be the moisture of 90 ℃ by utilize temperature in mixing operation as can be known, block have ratio with the moisture that utilized 15 ℃ the time compare and be reduced to approximately 87%.The above results shows, by utilizing more than 60 ℃ and the moisture below 90 ℃ (being the moisture of 60 ℃, 80 ℃ and 90 ℃ in this example), moisture spreads more equably to mixture, has realized the homogenizing of the moisture in the mixture, thus the granulation raising.
［ about the dissolving ratio of W-Gum ］
Then, in the present embodiment, for the W-Gum that utilizes as the organic system tackiness agent, practical measurement its how to change with respect to the variation along with the temperature of moisture of the dissolving ratio of moisture.In said determination, the moisture (temperature of moisture is 20 ℃, 60 ℃, 80 ℃, 90 ℃ these 4 kinds) of 500mL is added the W-Gum of 5.0g, by measuring the amount (g) of not dissolving the solute that is left, calculate the dissolving ratio.
Resulting result is shown in Fig. 5.As can be seen from Figure 5, be the moisture of 20 ℃ with respect to the temperature of moisture, the ratio of lysed W-Gum is 40%, and be the moisture of 60 ℃ with respect to the temperature of moisture, the dissolving ratio is about 48%, and is the moisture of 80 ℃ with respect to the temperature of moisture, and the dissolving ratio is about 70%, be the moisture of 90 ℃ with respect to the temperature of moisture, the dissolving ratio is about 96%.
The above results shows that by the temperature that makes the moisture that adds in mixing operation be more than 60 ℃ and below 90 ℃, and the solvability of tackiness agent itself and moisture improves, and this shows by tackiness agent and be dissolved in moisture, and the dispersion efficiency of tackiness agent improves.
［ about the variation of the intensity that becomes the blocking thing ］
Then, for the multiple one-tenth blocking thing that obtains according to operation manufacturing as described above, measure dried ultimate compression strength.About the mensuration of ultimate compression strength, implement according to the measuring method of the ultimate compression strength among the strength detection method of JIS Z-8841 defined.
Wherein, the one-tenth blocking thing of having measured ultimate compression strength is that to add respectively temperature be the one-tenth blocking thing that obtains of the moisture manufacturing of 15 ℃, 60 ℃, 80 ℃, 90 ℃, 120 ℃, 160 ℃, 200 ℃ and said mixture is further added the W-Gum of (the outside interpolation) 1% and adds the one-tenth blocking thing that the moisture manufacturing of said temperature obtains, amounts to 14 kinds.In addition, beyond these examples, the mixture of the addition of tackiness agent having been cut down after 13% is added the moisture of 90 ℃ and makes the one-tenth blocking thing that obtains and the mixture of the addition of tackiness agent having been cut down after 21% is added the moisture of 90 ℃ and makes the one-tenth blocking thing that obtains, measure equally ultimate compression strength.Wherein, make the one-tenth blocking thing that obtains and have the elliptical shape that major diameter is 20～30mm.
Resulting result is shown in Fig. 6.Wherein, in Fig. 6, expression is made as the relative intensity of 1 o'clock with the ultimate compression strength of the mixture that does not add tackiness agent having been added the one-tenth blocking thing in the situation of moisture of 15 ℃.
As can be known from Fig. 6, do not adding tackiness agent and adding under the tackiness agent both of these case, the temperature of the moisture that has added is more than 60 ℃ the time, and ultimate compression strength significantly improves.Thus, by add the moisture more than 60 ℃ in mixing operation, not only can make the granulation raising in granulating working procedure as can be known, and the intensity of the one-tenth blocking thing of manufacturing is improved.In addition, do not adding tackiness agent and adding under the tackiness agent both of these case as can be known, when the temperature of the moisture that has added was 90 ℃～200 ℃, ultimate compression strength was roughly certain value.The upper limit about the temperature of the moisture that adds in mixture, the dissolving ratio with respect to moisture of the heat resisting temperature of the equipment of each operation of implementing after being used for mixing operation and mixing operation and the device-restrictive of steam supply arrangement etc. and Fig. 5 considers near 100% when the moisture temperature is 90 ℃, and making the temperature of moisture of intensity raising of the one-tenth blocking thing of manufacturing is to be the most suitable more than 60 ℃ and below 90 ℃.
Then, be conceived to the intensity when the moisture that the mixture that is added with tackiness agent has been added 15 ℃ and the intensity the when mixture of the addition of having cut down tackiness agent has been added the moisture of 90 ℃.As can be known from Fig. 6, adding equally between the one-tenth blocking thing of moisture of 90 ℃, can observe: ultimate compression strength is because the reduction of the addition of tackiness agent reduces.Yet, as can be known the addition of tackiness agent is cut down 13% and the ultimate compression strength of one-tenth blocking thing of having added the moisture of 90 ℃ have with the mixture that contains tackiness agent is added 80 ℃ moisture the time the value of ultimate compression strength same degree, the addition of tackiness agent is cut down 21% and the value of the ultimate compression strength of one-tenth blocking thing of having added the moisture of the 90 ℃ ultimate compression strength same degree when having with the moisture that the mixture that contains tackiness agent added 15 ℃.This result represents can control the addition of tackiness agent by adding more than 60 ℃ and the moisture below 90 ℃ to mixture, and this has hinted by the manufacture method of the reduced iron that uses present embodiment, can widen the operating restraint for the manufacture of reduced iron.
Above, with reference to accompanying drawing, the preferred embodiment of the present invention is had been described in detail, but the present invention is not limited in above-mentioned example.To those skilled in the art, in the category of the technological thought that claims are put down in writing, obviously can expect various modifications or modification, these also belong to technical scope of the present invention certainly.
Utilizability on industry
According to the manufacture method of reduced iron of the present invention, can in the time will becoming blocking as the mixture of the raw material of reduced iron, granulation further be improved.
Nomenclature
11 hoppers
12 drying machines
13 pulverizers
15 mixing rolls
17 forming machines
19 drying machines
21 reduction furnaces
23 smelting furnace
Claims (7)
1. the manufacture method of a reduced iron, is characterized in that, comprises following operation:
Mixing operation is added more than 60 ℃ to the mixture that comprises the raw iron oxide material that is powdery and reducing material in this operation and the moisture below 90 ℃ and carry out mixing;
Granulating working procedure becomes the described mixture after described mixing operation blocking and makes into the blocking thing in this operation; With
The reduction operation generates reduced iron with the described one-tenth blocking thing reduction after described granulating working procedure in this operation.
2. the manufacture method of reduced iron according to claim 1, is characterized in that, in described mixing operation, described mixture further added the tackiness agent that dissolves in described moisture.
3. the manufacture method of reduced iron according to claim 2, is characterized in that, described tackiness agent is liquid organic system tackiness agent or pulverous organic system tackiness agent.
4. the manufacture method of reduced iron according to claim 3, is characterized in that, described tackiness agent is described pulverous organic system tackiness agent, and described tackiness agent is the starch that is selected from the cereal in rice, cassava, rye and corn.
5. the manufacture method of reduced iron according to claim 1, is characterized in that, in described mixing operation, by the interpolation of described moisture, the moisture containing ratio that makes described mixture is 6%～9%.
6. the manufacture method of reduced iron according to claim 1, is characterized in that, in described mixing operation, the particle diameter of mixing described mixture is before counted 70 μ m～500 μ m to sieve down 80% particle diameter.
7. the manufacture method of reduced iron according to claim 1, is characterized in that, the moisture containing ratio that adds described moisture described mixture before in described mixing operation is 1%～3%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010231512A JP5423645B2 (en) | 2010-10-14 | 2010-10-14 | Method for producing reduced iron |
| JP2010-231512 | 2010-10-14 | ||
| PCT/JP2011/072310 WO2012049974A1 (en) | 2010-10-14 | 2011-09-29 | Process for production of reduced iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103154276A true CN103154276A (en) | 2013-06-12 |
Family
ID=45938205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800491506A Pending CN103154276A (en) | 2010-10-14 | 2011-09-29 | Process for production of reduced iron |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5423645B2 (en) |
| KR (1) | KR20130080844A (en) |
| CN (1) | CN103154276A (en) |
| BR (1) | BR112013008360A2 (en) |
| WO (1) | WO2012049974A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357656A (en) * | 2014-11-20 | 2015-02-18 | 湖北丹江口市宝洲冶金材料有限公司 | Organic adhesive and blast furnace ironmaking pellet prepared from same |
| CN104498709A (en) * | 2014-11-20 | 2015-04-08 | 湖北丹江口市宝洲冶金材料有限公司 | Organic binder and steel mill pipe ash pressed pellet produced by the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6244920B2 (en) * | 2014-01-09 | 2017-12-13 | 新日鐵住金株式会社 | Method and apparatus for heating and drying cement-containing molded product |
| KR20200000676A (en) * | 2018-06-25 | 2020-01-03 | 주식회사 포스코 | Fe-CONTAINING BRIQUETTES AND MANUFACTURING METHOD THEREOF |
| JP7445122B2 (en) | 2020-03-18 | 2024-03-07 | 日本製鉄株式会社 | Method for producing agglomerates and method for producing reduced iron |
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- 2011-09-29 KR KR1020137009208A patent/KR20130080844A/en active Search and Examination
- 2011-09-29 BR BR112013008360A patent/BR112013008360A2/en not_active Application Discontinuation
- 2011-09-29 CN CN2011800491506A patent/CN103154276A/en active Pending
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| CN104357656A (en) * | 2014-11-20 | 2015-02-18 | 湖北丹江口市宝洲冶金材料有限公司 | Organic adhesive and blast furnace ironmaking pellet prepared from same |
| CN104498709A (en) * | 2014-11-20 | 2015-04-08 | 湖北丹江口市宝洲冶金材料有限公司 | Organic binder and steel mill pipe ash pressed pellet produced by the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012082493A (en) | 2012-04-26 |
| BR112013008360A2 (en) | 2016-06-14 |
| JP5423645B2 (en) | 2014-02-19 |
| WO2012049974A1 (en) | 2012-04-19 |
| KR20130080844A (en) | 2013-07-15 |
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Application publication date: 20130612 |