CN102333894A - Method for treating sintering granules - Google Patents
Method for treating sintering granules Download PDFInfo
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- CN102333894A CN102333894A CN2010800093913A CN201080009391A CN102333894A CN 102333894 A CN102333894 A CN 102333894A CN 2010800093913 A CN2010800093913 A CN 2010800093913A CN 201080009391 A CN201080009391 A CN 201080009391A CN 102333894 A CN102333894 A CN 102333894A
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- granulation
- granulation thing
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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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
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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
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
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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
Abstract
Disclosed is a method for treating sintering granules, which enables the maintenance of strength of granules even when the granules are exposed to excess moisture in a wet zone or when dry granules are mixed with wet granules and the dry granules reabsorb moisture, and which can achieve a continuous granulation treatment in a continuous treatment line. The method comprises supplying coated granules into a sintering machine, wherein the coated granules comprise: granule which are produced by subjecting a raw material containing an accessory raw material comprising a iron ore powder, a carbon material and caustic lime to a wet granulation procedure using a binder to produce granules; and at least one strength reduction-preventing agent selected from a coagulant, a hydrophobizing agent and a water repellent agent, which is adhered on the surfaces of the granules.
Description
Technical field
The present invention relates to be used for the treatment process of blast furnace with the sintering granulation thing of raw material.
Background technology
As the agglomerate of blast furnace with raw material, be to use tablets press with interpolation water such as iron ore, fuel, auxiliary material mix and granulation after, utilize sinter machine that it is burnt till and obtain.In order to keep and then improve the productivity of this agglomerate, the air permeability in the raw materials for sintering in sinter machine, guaranteeing to burn till is very important, and granulation becomes indispensable operation.
But the employed moisture of granulation evaporates in the process of burning till, and is formed on the granulation thing (pellet that does not burn till of bottom; Granules) the so-called humid zone of agglomerative in, the granulation thing that is in this excessive moisture crumbles, and causes the such problem of the ventilation of obstruction in sinter machine.In addition, in so existing granulation line, having made is becoming the granulation thing that adhered to micro mist on the coarse grain of nuclear particle, is being accurate granulation thing (forging a thing).
On the other hand; In recent years; Micro mist in order to tackle the poor qualityization that is accompanied by raw materials for sintering in the raw materials for sintering that increases had once been studied powder material had been chosen from this raw materials for sintering, and granulation on the granulation line of another system that is arranged side by side with above-mentioned existing granulation line; The half particle method that this granulation thing (below, be also referred to as micro mist granulation thing) is burnt till with the accurate granulation thing that comes out with existing granulation line granulation.
For example, in patent documentation 1, attempted improving its intensity, and enlarged the effect of guaranteeing the air permeability in sinter machine through the further dry micro mist granulation thing that adopts above-mentioned method to make.
But, with drying the micro mist granulation thing situation of having mixed with the accurate granulation thing of moisture state under, the micro mist granulation thing that produces dry absorbs the moisture in the accurate granulation thing, thus the intensity of this micro mist granulation thing reduces such problem.
From above situation; Even require accurate granulation thing in burning till humid zone be in the excessive moisture situation and with drying micro mist granulation thing sneak into accurate granulation thing moistening; The situation that micro mist granulation thing absorbs water again also can be guaranteed the technology of the intensity of accurate granulation thing and micro mist granulation thing.
As the means of the improved strength that is included in the granulation thing under such moisture state, have and use that for example adhesivity tackiness agent, clay are tackiness agent, dispersion glues, carbonating is handled or the method for hydraulic binder in the intensity of interior raising granulation thing.Below explanation at length.
So-called adhesivity tackiness agent is to show with the tackiness agent of bonded effect between particle as its typical example Mierocrystalline cellulose and starch etc. are arranged through adhering material.
For example, patent documentation 2 once disclosed through when granulation, using the excellent rosin series compound composition of adhesive power as the adhesivity tackiness agent, obtained the excellent raw material of moistening intensity and/or dry tenacity and used granular solid.
In addition, so-called clay is a tackiness agent, is that to comprise many size of particles be the microparticals below the 10 μ m, and it gets into the tackiness agent that shows the bonded effect between particle, as its typical example wilkinite etc. is arranged.
Patent documentation 3 has been put down in writing to be that the wilkinite of tackiness agent is a flocculation agent as this clay, thinks that clay component also has the cohesion function.In addition, once disclosed the inanimate matter flocculation agent that except organic sticker, also uses wilkinite etc., obtained the high ferric oxide particles of dry tenacity thus at patent documentation 3.And, though after patent documentation 3 oriented raw materials add wilkinite, add water and carry out granulation, and with its record as the effective utilization of aggregate, think to have atomic cohesion quite a fewly.
So-called dispersion glues is in water, to disperse also to be disposed between particle through the clay component that ore is contained again, and shows the tackiness agent that promotes the bonded effect, as its typical example ZX-I etc. is arranged.
In addition, so-called carbonating is handled, and is the method that improves the intensity of granulation thing through chemical reaction.
Patent documentation 5 once disclosed when adding unslaked lime and carry out granulation, through the CO that contains of contact exhaust etc.
2Gas, with the unslaked lime carbonating, to form the method for firm chemical bond.According to this method, even the granulation thing be in the excessive moisture situation or again the suction situation under, also can maintain intensity to a certain degree.
In addition, patent documentation 6 has been put down in writing through using ferruginous hydraulicity mineral wedding agent to carry out granulation as hydraulic binder, and carries out long maintenance, obtains high-intensity granulation thing.Thus, even the granulation thing be in the excessive moisture situation or again the suction situation under, the granulation thing also can possess the intensity of the above-mentioned situation of enough tolerances.
Citing document 7 discloses the method for manufacture of following agglomerate, and part mixing, granulation with powder iron ore, carbon material form preparatory granulation thing; The auxiliary material that contains CaO in the lining of the outside of this preparatory granulation thing; With the preparatory granulation thing of formation lining, and then preparatory granulation thing and remaining cooperation raw materials mix should be covered; Granulation becomes the quasi-particle of three-decker, and it is supplied to sinter machine.Thus, even conduct forms the SiO of the composition of slag
2, CaO content few, also can make the dropping strength height, can prevent the agglomerate of the deterioration of being reduced property.
The prior art document
Patent documentation 1: TOHKEMY 2006-336064 communique
Patent documentation 2: TOHKEMY 2005-89861 communique
Patent documentation 3: japanese kokai publication hei 11-193423 communique
Patent documentation 4: TOHKEMY 2005-15919 communique
Patent documentation 5: TOHKEMY 2001-279335 communique
Patent documentation 6: Japan special table 2006-508251 communique
Patent documentation 7: TOHKEMY 2007-211289 communique
Patent documentation 8: japanese kokai publication sho 60-248827 communique
Summary of the invention
But above-mentioned method in the past remains the problem in the following that kind that should solve.
In patent documentation 2, because the adhesivity tackiness agent is water miscible, therefore be under the situation of situation or suction again in the excessive moisture at the granulation thing, exist the adhesivity tackiness agent to dissolve, can not keep the problem of the intensity of granulation thing fully.
In addition, in patent documentation 3, the wilkinite that will have cohesion is blended into the raw materials for sintering when granulation begins, and the intensity of therefore causing the granulation thing reduces.In order to make firm granulation thing, need the good dispersion of tackiness agent and micropartical (clay), but in above-mentioned method, because bentonitic cohesion disperses to be hindered, this will become defective.
In addition,, obtained good dispersion,, therefore be under the situation of situation or suction again in the excessive moisture, can not guarantee its intensity fully at the granulation thing because clay is tackiness agent easy redispersion in water even bentonitic cohesion is few.
In addition, the dissemination of patent documentation 4 described tackiness agents is not through losing the raw materials for sintering granulation, in case also can bring into play its function with the raw materials for sintering granulation and after carrying out drying.Therefore, be under the situation of situation or suction again in the excessive moisture, produce the redispersion of clay component, can not keep the intensity of granulation thing fully at the granulation thing.
In addition, in patent documentation 5, be used to make the reaction of unslaked lime carbonating and need the long period, therefore be difficult to this method is imported existing continuous processing technique, for example carries out in the technology that hundreds of tons granulation in per 1 hour handles in order fully to cause.In addition, because the above-mentioned reaction needed long period,, produce the redispersion of unslaked lime, can not keep the intensity of granulation thing fully so before this sufficient reacting carried out, the granulation thing was under the situation of situation or suction again in the excessive moisture.
In addition, the method for patent documentation 6 is a prerequisite with the maintenance of carrying out the granulation thing for a long time, therefore is difficult to this method is applied in the existing continuous processing technique.In addition, before the maintenance of granulation thing, the granulation thing is under the situation in the excessive moisture, has the problem same with above-mentioned patent documentation 5.
In the method for citing document 7; The CaO layer is present in the middle level of the granulation thing (quasi-particle) of three-decker; Therefore with respect to the moisture of invading from the top layer of quasi-particle, the effect of the hydrophobic anti-water (waterproof) in cohesion zone is little, therefore can not fully keep the intensity of the skin section of granulation thing (quasi-particle).
In addition, in patent documentation 8, the layer that is attached to the surface of coarse grain ore exists with the micro mist ore with as the form of the mixture of the lime powder in CaO source, makes CaO/SiO
2Than rising, and postpone CaO and SiO
2Reaction.Such CaO as after state, flocculating result, hydrophobic anti-water effect are little, the intensity that can not suppress the granulation thing reduces.
The present invention accomplishes in view of such situation; Even its purpose is to provide a kind of granulation thing to be in the situation in the excessive moisture or the drying-granulating thing to be sneaked into thereby the drying-granulating thing takes place under the situation of suction again in the moistening granulation thing at humid zone; Also can keep the intensity of granulation thing, and can be in the treatment process of handling the sintering granulation thing of implementing the granulation processing in the line continuously continuously.
Treatment process according to the sintering granulation thing that the present invention relates to of above-mentioned purpose; Be the treatment process of following sintering granulation thing: make the top layer adhesion strength of the granulation thing that the cooperation raw material wet type granulation of adopting tackiness agent will comprise source of iron raw material, carbon material that contains the powder iron ore and the auxiliary material that contains lime forms reduce suppressor factor; Form the lining granulation thing of supplying with to sinter machine, said intensity reduce suppressor factor comprise in flocculation agent, hydrophobizing agent and the water repellent agent (water-resisting agent) any or two or more.In addition, in the present invention, so-called lining granulation thing, the part that is meant the top layer at least of the granulation thing that forms in the wet type granulation intensity that has been covered reduces the material of suppressor factor.
In the treatment process of the sintering granulation thing that the present invention relates to, preferred: as, above-mentioned granulation thing to be carried out drying treatment in that above-mentioned granulation thing is adhered to before above-mentioned intensity reduces suppressor factor.
In the treatment process of the sintering granulation thing that the present invention relates to, above-mentioned tackiness agent also can be adhesivity tackiness agent, clay be tackiness agent and dispersion glues any or two or more.
The treatment process of the sintering granulation thing that the present invention relates to makes and adopts the top layer adhesion strength of the granulation thing that the granulation of tackiness agent wet type forms to reduce suppressor factor, forms lining granulation thing, and the intensity that therefore can suppress the granulation thing reduces.
At this, reduce under the situation of using flocculation agent in the suppressor factor in intensity, can keep the state of aggregation of the particle on the top layer that constitutes the granulation thing, even when therefore the granulation thing is in the excessive moisture or when absorbing water again, also can suppress granulation thing redispersion.
In addition, reduce under the situation of using hydrophobizing agent or water repellent agent in the suppressor factor, can suppress moisture and excessively invade in the granulation thing,, also can suppress granulation thing redispersion even therefore the granulation thing is in the excessive moisture in intensity.
In addition, as long as intensity reduces the top layer that suppressor factor is attached to the granulation thing, therefore can implement to adhere to processing in short period of time ground.
Therefore; Even thereby the granulation thing is in the situation in the excessive moisture and/or the drying-granulating thing is sneaked under the situation that moistening granulation thing drying-granulating thing absorbs water again at humid zone; Also can keep the intensity of granulation thing, and can implement the granulation processing continuously in the processing line continuously.
In addition, before granulation thing adhesion strength is reduced suppressor factor, under the withering situation of granulation thing, can embody the effect of the strength maintenance of granulation thing more significantly.
The granulation thing has been carried out under the situation of drying treatment, has compared rising before the intensity of granulation thing and the drying, but when this granulation thing is in the excessive moisture or when absorbing water again, the intensity of granulation thing be reduced to drying before identical degree.That is to say,, can keep the intensity after the drying treatment through adhesion strength reduces suppressor factor on the top layer of the granulation thing that has carried out drying treatment.
Secondly, tackiness agent is that adhesivity tackiness agent, clay are under any perhaps two or more situation of tackiness agent and dispersion glues, can embody the effect of the strength maintenance of granulation thing more significantly.This is owing to adhesivity tackiness agent, clay are that tackiness agent and dispersion glues are the causes of losing the tackiness agent of bonding force because of moisture.
In addition, as unslaked lime, cement and hydraulic binder etc., adopting chemical bonded tackiness agent, is that tackiness agent and dispersion glues are different with above-mentioned adhesivity tackiness agent, clay, little by the influence to bonding force that moisture causes.But before the performance chemical combined, the intensity that just produces the granulation thing that problem of the present invention promptly causes by moisture reduced, and the effect that therefore reduces the strength maintenance of adhering to the granulation thing that brings of suppressor factor by intensity can embody significantly.In addition, after having brought into play the chemical combination, it is also little to improve surplus, but the effect of being brought by intensity reduction suppressor factor is not little.
Description of drawings
Fig. 1 is the explanatory view of relation of clay ratio and the ultimate compression strength of expression granulation thing.
Fig. 2 is the kind and the solids component ratio that are illustrated in the tackiness agent that uses in the granulation of granulation thing and the explanatory view of the relation of the ultimate compression strength of the granulation thing of having made.
Fig. 3 is the explanatory view of expression flocculation agent to the relation of the ultimate compression strength of the adhesion amount of granulation thing and granulation thing.
Fig. 4 is the explanatory view of expression water repellent agent to the relation of the ultimate compression strength of the adhesion amount of granulation thing and granulation thing.
Fig. 5 is the explanatory view of expression by the variation of the ultimate compression strength that has or not the dried granulation thing that causes of adhering to of intensity reduction suppressor factor.
Fig. 6 is the explanatory view of expression by the variation of the ultimate compression strength that has or not the undried granulation thing that causes of adhering to of intensity reduction suppressor factor.
Fig. 7 (A) is the explanatory view of expression coagulant solution to the relation of the adhesion amount of granulation thing and ventilation index.
Fig. 7 (B) is an expression flocculation agent powder to the explanatory view of the relation of the adhesion amount of granulation thing and ventilation index.
Fig. 7 (C) is the explanatory view of expression water repellent agent to the relation of the adhesion amount of granulation thing and ventilation index.
Embodiment
On one side with reference to accompanying drawing, on one side the embodiment that the present invention has been specialized is described, for understanding of the present invention.
At first, describe for fact of the treatment process of expecting the sintering granulation thing that an embodiment of the invention relate to, the treatment process for sintering granulation thing describes then.
At first, studied at the granulation thing and be under the situation of situation or suction again in the excessive moisture reason that the intensity of granulation thing reduces.
The intensity of granulation thing, not only through by crosslinked adhering to of causing of the liquid of water, that kind also as shown in Figure 1 gets between particle through micropartical (clay) and to guarantee to embody adhesive attraction.In addition, this granulation thing is to use dispersion glues (macromolecule dispersing agent) micro mist to be carried out the micro mist granulation thing of granulation.
At this, the clay ratio of the transverse axis of so-called Fig. 1 is the ratio that constitutes the clay in whole raw materials for sintering of granulation thing.In addition; The ultimate compression strength of the longitudinal axis of Fig. 1 (below, also simply be called intensity) be that the collection diameter is the granulation thing of 7～8mm, this granulation thing is loaded into load cell; Utilization is depressed with the metal sheet of decline in 5mm/ minute from top; After the force of compression value that load cell shows rises, grasp the maximal pressure that shows the moment of sharply the reducing power (N) that contracts, with its sectional area (cm divided by the granulation thing
2) measured value of trying to achieve uses 5 granulation things to average and the value that obtains (below identical).
But; That kind as shown in Figure 2; With using dispersion glues to carry out (zero) after the micro mist granulation thing drying of granulation; With the occasion (●) that moistening granulation thing is mixed together, the moisture of the granulation thing that dried granulation thing absorbs moistening, therefore take place the phenomenon that ultimate compression strength reduces (zero → ●).Inferring this is because the dissemination of tackiness agent is also brought into play function after with raw materials for sintering granulation and drying, so in case clay component that cohesion taken place because of the moisture that has absorbed redispersion takes place, then lost bonding force between particle.
In addition, because adhesivity tackiness agent (Mierocrystalline cellulose) also is water miscible,, can know that because of excessive moisture, the adhesivity tackiness agent has also been lost its bonding force so see same tendency (△ → ▲).
In addition, the transverse axis of Fig. 2 is represented the ratio of the solids component (effective constituent) of each tackiness agent.
According to such phenomenon, studied handling continuously that (online) can carry out successive granulation treatment measures in the line, the result has conceived the treatment process of the sintering granulation thing that an embodiment of the invention relate to.Promptly; The treatment process of the sintering granulation thing that an embodiment of the invention relate to; Be to make the top layer adhesion strength that adopts the granulation thing that the granulation of tackiness agent wet type forms reduce the method for suppressor factor, said intensity reduce suppressor factor comprise flocculation agent, hydrophobizing agent and water repellent agent any or two or more.Below, at length describe.
At first, describe for the adhesion effect of flocculation agent to the top layer of granulation thing.
Use dispersed system tackiness agent (macromolecule dispersing agent) that micro mist is carried out granulation and dry, the back is mixed by the granulation thing elder generation of this dryness take out with wet raw material, relatively the result of its ultimate compression strength is shown in Fig. 3.In addition, the flocculation agent adhesion amount of the transverse axis of Fig. 3, the solids component weight that is meant flocculation agent is with respect to the dry weight (g) of granulation thing and be attached to the ratio (quality %) of summation of the abundant weight of solid (g) of flocculation agent on the top layer of this granulation thing.Therefore, in the transverse axis of Fig. 3, so-called flocculation agent adhesion amount is the result who does not adhere to the situation of flocculation agent on the top layer of granulation thing for " 0 ".
As shown in Figure 3, dried granulation thing has shown about 1MPa (10kgf/cm
2) ultimate compression strength, but do not adhere under the situation that flocculation agent just mixed with wet raw material on the top layer of this granulation thing, ultimate compression strength is reduced to about 0.2MPa (2kgf/cm
2).
Relative therewith; Use is as the macromolecular compound of an example of flocculation agent; The aqueous solution (●) of this flocculation agent is attached under the situation on top layer of granulation thing in advance; Ultimate compression strength reached maximum (0.8MPa) when adhesion amount was about 0.06 quality %, and adhesion amount becomes the result that effect reaches capacity more than it the time.Though inferring this is because the top layer of granulation thing utilizes flocculation agent to guarantee intensity; But because moisture penetration is to inner; Thereby the internal intensity of granulation thing reduces, and the cause that effect is offset can be thought on the adhesion amount of flocculation agent and skin depth, to have appropriate amount.
In addition, from the purpose of the influence of the water of the aqueous solution that relaxes flocculation agent, make under the situation that flocculation agent adheres to the powder attitude tendency that the amount of with good grounds powder, ultimate compression strength little by little rise.
Therefore think, must be according to intensity, granularity and distribution thereof as the granulation thing of purpose, suitably select to make the method that flocculation agent adheres to and be optimized.
Then, describe for the adhesion effect of water repellent agent (hydrophobizing agent) to the top layer of granulation thing.
Use is shown in Fig. 4 as the result that one of water repellent agent routine whiteruss (liquid) substitutes above-mentioned flocculation agent.In addition, the water repellent agent adhesion amount of the transverse axis of Fig. 4 is water repellent agent weight with respect to the dry weight (g) of granulation thing and is attached to the ratio (quality %) of summation of weight (g) of water repellent agent on the top layer of this granulation thing.Therefore, in the transverse axis of Fig. 4, so-called water repellent agent adhesion amount is " 0 ", is the result who does not adhere to the situation of water repellent agent on the top layer of granulation thing.
As shown in Figure 4, ultimate compression strength improves along with the increase of the adhesion amount of water repellent agent, but demonstrates the saturated gradually tendency of effect.
Therefore, infer the suitable adhesion amount that there is water repellent agent and adhere to thickness, think must according to as the intensity of the granulation thing of target and/or granularity with attachment means optimization.
As making any the perhaps two or more intensity that comprises these flocculation agent, water repellent agent and hydrophobizing agent reduce suppressor factor; (online) is attached to the granulation thing to form the method for lining granulation thing in the line handling continuously, the method for under any state of powder, liquid, the aqueous solution and slurries, carrying out for example arranged, or make up the method that two or more states carries out.In addition, intensity reduces suppressor factor preferably adheres to the whole state in top layer that covers the granulation thing, even but adhere to the state that part property ground covers the part (for example, more than 50% of surface-area) on top layer, also can obtain its effect.Specifically, adopt following method.
Intensity reduces the spraying under the powder state of suppressor factor, for example has: thus thereby powder is carried out air with dry state transport the method that sprays on the granulation thing, utilize belt conveyer to transport to add the method on the granulation thing to.
In addition, the spraying under liquid state if intensity reduces suppressor factor originally as liquid, then for example has: use nozzle to spread to the method on the granulation thing; Mixed foaming agent to be forming blister, and it is sneaked into the method for granulation thing.In addition, not liquid if intensity reduces suppressor factor itself, then make its state that forms the aqueous solution and/or slurries, utilize above-mentioned method spraying.
As making this intensity reduce the position that suppressor factor adheres to, following position is arranged.
For example; Use existing granulation line; Utilize tablets press to be manufactured on to become under the situation of the accurate granulation thing that has adhered to micro mist on the coarse grain of granulation nuclear particle, utilize and add intensity from the later half transporter during the sinter machine of packing into of tablets press and reduce suppressor factor and it is adhered to form lining granulation thing.In addition, so-called tablets press later half means in the granulation way of tablets press that for example granulation has been finished dealing with for 70～90% stage.At this, so-called granulation has been finished dealing with for example 90% stage, mean T minute granulation deadline with respect to the granulation thing (total granulation time) be 0.9 * T (minute) period.Therefore, intensity reduces suppressor factor and adheres to for 90% the granulation thing of having accomplished the granulation deadline.
In addition; Use the granulation line of another system that is arranged side by side with above-mentioned existing granulation line; Utilize tablets press will carry out granulation from the powder material that raw materials for sintering is chosen with under the situation of making micro mist granulation thing, after this micro mist granulation thing is discharged from withering drying machine, up to above-mentioned accurate granulation thing (wet raw material) blended during transport in the path; Add intensity and reduce suppressor factor and it is adhered to, form lining granulation thing.
When utilizing the granulation line granulation of above-mentioned existing granulation line or another system to form such granulation thing, tablets press (for example drum mixer, the strange stirrer of Airy etc.) is supplied with raw materials for sintering, tackiness agent and water etc., carry out the wet type granulation.
This tackiness agent can use for example adhesivity tackiness agent, clay be tackiness agent, dispersion glues and hydraulic binder any or two or more.
At this; The adhesivity tackiness agent has for example Mierocrystalline cellulose and starch etc., and clay is that tackiness agent has for example wilkinite and unslaked lime etc., and dispersion glues has for example ZX-I; Hydraulic binder has for example ferruginous hydraulicity mineral wedding agent, but is not limited to these tackiness agents.
In addition; Above-mentioned dispersion glues; So long as the effect that has through add the dispersiveness of ultra micron in moisture below the 10um that comes to be contained in the acceleration of sintering raw material when the granulation of raw materials for sintering with water gets final product; Be not limited to mineral compound, organic cpds, low molecular compound or macromolecular compound,, be preferably macromolecular compound with acidic group and/or its salt though there is not special qualification.Wherein, weight-average molecular weight is ZX-I or the ammonium polyacrylate more than 1000, below 100,000 because make micropartical dispersive ability high, and therefore low price can most preferably use.
In addition, state in the use among the tackiness agent, be under the situation of tackiness agent and dispersion glues at adhesivity tackiness agent, the clay of the influence that receives moisture after the granulation easily, can obtain the effect that intensity of the present invention reduces suppressor factor significantly.
At this, becoming the granulation thing that makes intensity reduce the object that suppressor factor adheres to has above-mentioned accurate granulation thing and micro mist granulation thing, but wherein preferred: the granulation thing above the granulation thing of sieve aperture 2mm that contains 50 quality % above (also can be 100 quality %).
The size of granulation thing is to be lower than under the situation of sieve aperture 2mm, and the surface-area of granulation thing is excessive, and the usage quantity of intensity reduction suppressor factor increases thereby be uneconomical.In addition, can not embody its effect even make so little granulation thing adhesion strength reduce suppressor factor.
In addition, big if the granulation thing becomes, then embody the effect that intensity reduces suppressor factor, though therefore do not have special qualification, utilize the upper limit of size of the granulation thing of tablets press granulation manufacturing, be about 20mm on the general knowledge.
Then, the kind for the flocculation agent, water repellent agent and the hydrophobizing agent that are used for intensity reduction suppressor factor describes.So-called flocculation agent, be have as in case the clay component that is in state of aggregation at the also material of the flocculating result (inhibition divergent function) the redispersion not in the excessive moisture.
Material as such has: Tai-Ace S 150, poly aluminium chloride, iron trichloride, ferrous sulfate, contain the aqueous solution of mg ion and calcium ion.The polymer coagulant etc. that organic coagulants, anionic property, nonionic or the cationic of aniline-formaldehyde polycomplex hydrochloride, polyhexamethylene sulfide allanic acid salt, polyvinyl benzyl trimethyl ammonium chloride etc. are arranged in addition.
In addition, flocculation agent is not limited to above-mentioned substance, so long as there is the material of the effect that makes the clay component cohesion to get final product.In addition, in use, also can make up above-mentioned material and/or form and use.
Water repellent agent, hydrophobizing agent are to have the moisture of inhibition to invade in the granulation thing, excessively do not invade the anti-water effect such in the granulation thing or the material of hydrophobic effect.
As such material, the silicon that paraffin series water repellent agent, trimethyl silicane and the modification alkyl silicon etc. of whiteruss, clorafin, natural wax and synthetic wax etc. are arranged is that silane-based polymkeric substance, the fluorine of water repellent agent, trichloromethyl silane etc. is water repellent agent, urethanum based polymer etc.
In addition, water repellent agent, hydrophobizing agent are not limited to above-mentioned substance, so long as there is the material of anti-water effect, hydrophobic interaction to get final product.In addition, in use, also can make up above-mentioned material and/or form and use.At this, as these materials that water repellent agent, hydrophobizing agent illustration go out, investigated previous example, do not carry out strict differentiation, but mean the material of the wettability variation that makes water and iron ore.
In addition, above-mentioned intensity reduction suppressor factor does not comprise quicklime (unslaked lime) powder.This is because its flocculating result, hydrophobic anti-water effect are little, can not suppress the cause that the intensity of granulation thing reduces.In addition, it is therefore important that quicklime (unslaked lime) improves the intensity of the agglomerate behind the sintering, and the variation of the calcium oxide content that contains in the agglomerate brings influence to operation, therefore preferably do not reduce suppressor factor as intensity and use.
The top layer adhesion strength that makes the granulation thing that more than illustrates reduces the effect of the processing of suppressor factor, and through the granulation thing that has carried out drying treatment is in advance carried out, it is more remarkable to become.Its result is shown in Fig. 5, Fig. 6.
At this, Fig. 5 is the result who has carried out the granulation thing of drying treatment, and Fig. 6 is the result who does not have withering granulation thing.In addition; The micro mist granulation thing that the granulation thing that uses among Fig. 5, Fig. 6 all is to use dispersion glues (macromolecule dispersing agent) that micro mist has been carried out granulation, " zero " symbol among Fig. 5, Fig. 6 be make the top layer of granulation thing adhere to aluminum sulfate aqueous solution as an example of flocculation agent (solids component weight: the result in the time of 0.06 quality %) (implementing to handle), " ▲ " symbol are the result'ss (non-processor) when not adhering to aluminum sulfate aqueous solution.
As shown in Figure 5, the granulation thing has been implemented under the situation of drying treatment, the intensity of granulation thing temporarily uprises because of dry, if but former state ground is moistening again, then intensity be reduced to drying before identical degree (among Fig. 5 ▲).Relative therewith, the top layer of granulation thing has been adhered under the situation of aluminum sulfate aqueous solution, can suppress because of the intensity reduction of the moistening granulation thing that causes again, thereby can keep high intensity (zero among Fig. 5).
In addition, as shown in Figure 6, under the situation of drying-granulating thing not, adhere to aluminum sulfate aqueous solution through the top layer that makes the granulation thing, even moisteningly more also can keep its intensity, but strength level becomes low-level (zero among Fig. 6).
Can confirm by above situation, after the granulation thing has been implemented drying treatment, make the top layer adhesion strength of granulation thing reduce suppressor factor, can the strength maintenance of granulation thing be got higher.
Embodiment
Then, describe for the embodiment that carries out in order to confirm action effect of the present invention.
At first, describe making the top layer of adopting the accurate granulation thing that above-mentioned existing granulation line made adhere to the result that intensity reduces suppressor factor.
Use has cooperated the cooperation raw material (ore powder: lime 70.5%: serpentinite 10.0%: carbon material 1.0%: 3.5%, return mine: 15.0% of raw materials for sintering of several iron ore powder and carbon material, lime and serpentinite etc.; Add up to 100%); Utilize drum mixer (tablets press); Mix and carried out granulation in 4 minutes while adding water, the amount of moisture of granulation thing is adjusted into 7 quality %.When this wet type granulation, it is the unslaked lime of the effect of tackiness agent that interpolation has as clay.In addition, the amount of moisture of granulation thing is a moisture with respect to the ratio of the summation of the dry weight of granulation thing and moisture.
As after make the granulation thing adhesion strength that is a granulated into like this reduce suppressor factor under the test conditions stating with after forming lining granulation thing; Be loaded in pot burning apparatus, on one side utilize the 1000mm water column from the pot bottom the vacuum suction air on one side to the upper epidermis portion igniting of the granulation thing that loaded to burn till the granulation thing.And, measure the attraction air quantity (Nm in burning till
3/ little, the time), the attraction air quantity of comparative example 1 is made as 1, calculate the ventilation index of each embodiment.Therefore, ventilation index is big more, and then air permeability is good more.
This test conditions and result are shown in table 1, and test-results is shown in Fig. 7 (A)～Fig. 7 (C).
Table 1
Comparative example 1 in the table 1 is not make granulation thing adhesion strength reduce suppressor factor, the result of the situation of having burnt till to former state.
On the other hand; Embodiment 1～11st, and the granulation time in drum mixer was made as 4 minutes; The moment (granulation has been finished dealing with for 75% the moment) of passing through 3 minutes in the granulation way scatters various intensity and reduces suppressor factor (flocculation agent, water repellent agent), thereby makes it be attached to the result on the top layer of granulation thing.In addition; The test that changes the adhesion amount of intensity reduction suppressor factor is carried out for the scope of 0.01～0.1 quality %; Like above-mentioned Fig. 3, shown in Figure 4; Be accompanied by the increase that intensity reduces the adhesion amount of suppressor factor, its effect is little by little saturated, therefore here only puts down in writing for the scope of 0.01～0.03 quality %.At this, the solution of the flocculation agent (Tai-Ace S 150) that in embodiment 1～3, uses in case make the aqueous solution, is sprayed by nozzle its force feed to the granulation thing.The adhesion amount of Fig. 7 (A) expression coagulant solution and the relation (following embodiment also is same) of ventilation index.In addition, the adhesion amount of so-called coagulant solution is the powder weight (effective constituent amount) of flocculation agent.
In addition, the powder of the flocculation agent (Tai-Ace S 150) that in embodiment 4～6, uses, utilize sieve broken on one side, on the granulation thing, spray equably on one side.The adhesion amount of Fig. 7 (B) expression flocculation agent powder and the relation (following embodiment also is same) of ventilation index.
And the water repellent agent (whiteruss) that in embodiment 7～9, uses is force feed liquid itself and utilizes nozzle that the granulation thing is sprayed.The adhesion amount of Fig. 7 (C) expression water repellent agent and the relation (following embodiment also is same) of ventilation index.In addition, embodiment the 10, the 11st, with the solution of above-mentioned flocculation agent and the water repellent agent result with the same amount spraying.
Confirmed the tendency that arbitrary example of embodiment 1～11 all has air permeability to improve with respect to comparative example 1 significantly from table 1 and Fig. 7 (A)～Fig. 7 (C), and obtained along with its effect of increase that intensity reduces the adhesion amount of suppressor factor become big result (unslaked lime among Fig. 7 (A)～Fig. 7 (C): ◆).Particularly shown in embodiment 11, solution through making flocculation agent and the water repellent agent 0.02 quality % that respectively does for oneself sprays with same amount, can obtain 5% ventilation and improve.
Can think by above result, reduce the top layer that suppressor factor is attached to the granulation thing,, embody the effect of improving ventilation along with the damage of the granulation thing of hydrogenesis is suppressed through making intensity.
In addition; Above-mentioned result has adhered to intensity on the granulation of the drum mixer later half top layer that makes the granulation thing to reduce the result under the situation of suppressor factor; But after utilizing drum mixer to carry out the granulation processing, adhered to the situation of intensity reduction suppressor factor on the top layer that during pot burning apparatus of packing into, makes the granulation thing and also seen the tendency same with above-mentioned result.
Then, describe for adhered to the result that intensity reduces suppressor factor on the top layer of the micro mist granulation thing of the granulation line manufacturing of using another system that is arranged side by side with above-mentioned existing granulation line.
From several ore, choose the many ore 20 quality % of powder content; Utilize ball mill that it is pulverized; The various tackiness agents 0.1 quality % that states after the interpolation; The moisture that makes the granulation thing is 9 quality %, utilize the drum mixer granulation after, utilized known in the past hot blast conveyor dryer to carry out dry moisture and become 2 quality % up to the granulation thing.In addition, in granulation process, add intensity and reduced suppressor factor.
Then; After this micro mist granulation thing is mixed into the accurate granulation thing of being made by the ore of remaining 80 quality %; Be loaded in pot burning apparatus; On one side from the pot bottom with the vacuum suction air of 1000mm water column on one side to the upper epidermis portion igniting of the granulation thing that loaded to burn till the granulation thing, adopt above-mentioned method to calculate the ventilation index of each embodiment.In addition, the accurate granulation thing of admixed finepowder granulation thing is the granulation thing of above-mentioned comparative example 1, that is, be that the moisture that does not have adhesion strength to reduce suppressor factor on the top layer is the granulation thing of the moisture state of 7 quality %.
This test conditions and result are shown in table 2, and test-results is shown in Fig. 7 (A)～Fig. 7 (C).
At this; When the wet type granulation of micro mist ore, used the wilkinite (example of clay property tackiness agent) or the dispersed macromolecule dispersing agent (example of dispersion glues) of (example of adhesivity tackiness agent), the clay system that has adhering Mierocrystalline cellulose as tackiness agent.
In addition, the comparative example 2 in the table 2 is not make micro mist granulation thing adhesion strength reduce suppressor factor, and the micro mist granulation thing that will mix and accurate granulation thing former state the result of the situation of having burnt till.
On the other hand, embodiment 12～22nd, before the moistening accurate granulation thing that is mixed into 80 quality % after the micro mist granulation thing drying treatment, make various intensity reduce the result that suppressor factor (flocculation agent, water repellent agent) is attached to the top layer of micro mist granulation thing.In addition, the test that changes the adhesion amount of intensity reduction suppressor factor is carried out for the scope of 0.01～0.1 quality %, because the reason same with above-mentioned test only put down in writing for the scope of 0.02～0.06 quality % at this.
At this, intensity reduce adhering to of suppressor factor be through the micro mist granulation thing after the drying treatment is added in the drum mixer, has scattered intensity reduce suppressor factor after, cylinder is rotated mix for three times and carries out.
In addition, distribution and the solution of flocculation agent or the spraying of water repellent agent of powder that reduces the flocculation agent of suppressor factor as intensity is to utilize with the above-mentioned same method of test to carry out.
Like this, the moistening accurate granulation thing of having implemented the micro mist granulation thing that adheres to processing that various intensity reduce suppressor factor and 80 quality % is combined, use the drum mixer rotation to mix for five times., gather the micro mist granulation thing of a part, measured its ultimate compression strength thereafter.
Confirm significantly from table 2 and Fig. 7 (A)～Fig. 7 (C); Arbitrary example of embodiment 12～22 all has the intensity of guaranteeing the granulation thing and the effect of improving ventilation with respect to comparative example 2, and obtained along with its effect of increase that intensity reduces the adhesion amount of suppressor factor become big result (Mierocrystalline cellulose among Fig. 7 (A)～Fig. 7 (C): ●, wilkinite: ▲, macromolecule dispersing agent:).
In addition, used under the situation of flocculation agent of powder, compared with the flocculation agent and/or the water repellent agent of solution, effect is in low slightly level, and inferring this is because powder is difficult to be scattered in equably the cause on the top layer of granulation thing.In addition, even flocculation agent uses with the solution form, also obtained the slightly little result of effect with respect to adhesivity tackiness agent (Mierocrystalline cellulose).
Can confirm from above result; The treatment process of the sintering granulation thing of the application of the invention; Even thereby the granulation thing is in the situation in the excessive moisture or the drying-granulating thing is sneaked under the situation that moistening granulation thing drying-granulating thing absorbs water again at humid zone; Also can keep the intensity of granulation thing, and can implement the granulation processing continuously in the processing line continuously.
Abovely the present invention has been described, but the present invention is not defined in the formation that above-mentioned embodiment is put down in writing, is also included within other embodiment and the variation of considering in the scope of the item of putting down in writing in the scheme of asking for protection with reference to embodiment.For example, making up each above-mentioned embodiment and/or part or all situation that constitutes the treatment process of sintering granulation thing of the present invention of variation is also included within the scope of asking for protection of the present invention.
Claims (3)
1. the treatment process of a sintering granulation thing; It is characterized in that; Make the top layer adhesion strength that adopts tackiness agent will comprise the granulation thing that cooperation raw material wet type granulation that source of iron raw material, the carbon material that contains the powder iron ore and the agglomerate that contains the auxiliary material of lime use forms reduce suppressor factor; Form the lining granulation thing of supplying with to sinter machine, said intensity reduce suppressor factor comprise flocculation agent, hydrophobizing agent and water repellent agent any or two or more.
2. the treatment process of sintering granulation thing according to claim 1 is characterized in that, in that said granulation thing is adhered to before said intensity reduces suppressor factor, with said granulation thing drying treatment.
3. according to the treatment process of each described sintering granulation thing of claim 1 or 2, it is characterized in that, said tackiness agent be tackiness tackiness agent, clay be tackiness agent and dispersion glues any or two or more.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-044386 | 2009-02-26 | ||
| JP2009044386 | 2009-02-26 | ||
| PCT/JP2010/052798 WO2010098329A1 (en) | 2009-02-26 | 2010-02-17 | Method for treating sintering granules |
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| CN102333894A true CN102333894A (en) | 2012-01-25 |
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| CN2010800093913A Pending CN102333894A (en) | 2009-02-26 | 2010-02-17 | Method for treating sintering granules |
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|---|---|
| JP (1) | JP5398820B2 (en) |
| KR (1) | KR101309753B1 (en) |
| CN (1) | CN102333894A (en) |
| BR (1) | BRPI1008483B1 (en) |
| WO (1) | WO2010098329A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106460088A (en) * | 2014-05-12 | 2017-02-22 | 通用电气公司 | Treatments for iron sinter or green mix |
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| JP7207153B2 (en) * | 2019-05-16 | 2023-01-18 | 日本製鉄株式会社 | agglomerates |
| KR102251037B1 (en) * | 2019-08-09 | 2021-05-12 | 주식회사 포스코 | Method of manufacturing sintered ore |
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|---|---|---|---|---|
| CN1311070A (en) * | 2001-02-15 | 2001-09-05 | 刁梦龙 | Composite coating magnesium particles and its preparing method |
| CN101310033A (en) * | 2005-11-25 | 2008-11-19 | 杰富意钢铁株式会社 | Process for producing sintered ore |
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| JPS5196704A (en) * | 1975-02-22 | 1976-08-25 | Shoketsugenryono gijiryukasokushinho | |
| JPS60131930A (en) * | 1983-12-19 | 1985-07-13 | Nippon Kokan Kk <Nkk> | Pellet for sintered ore |
| JPS61130428A (en) * | 1984-11-30 | 1986-06-18 | Nippon Kokan Kk <Nkk> | Production of mini-briquette |
| JP4261672B2 (en) * | 1999-03-26 | 2009-04-30 | 新日本製鐵株式会社 | Granulation method of sintering raw material |
| MXPA02008760A (en) * | 2000-03-08 | 2004-09-06 | Hercules Inc | Method of sintering and sinter bed composition. |
| JP4464630B2 (en) * | 2003-06-27 | 2010-05-19 | 株式会社神戸製鋼所 | Method for producing sintered ore |
| JP2007169780A (en) * | 2005-11-25 | 2007-07-05 | Jfe Steel Kk | Process for producing sintered ore |
| JP5105810B2 (en) * | 2006-09-20 | 2012-12-26 | 株式会社日向製錬所 | Rotary kiln dust granulation method |
| JP2009024190A (en) * | 2007-07-17 | 2009-02-05 | Jfe Steel Kk | Method for producing molded raw material to be sintered |
| JP5308711B2 (en) * | 2008-05-16 | 2013-10-09 | 新日鐵住金株式会社 | Granulation method for sintered raw materials for iron making |
-
2010
- 2010-02-17 WO PCT/JP2010/052798 patent/WO2010098329A1/en active Application Filing
- 2010-02-17 BR BRPI1008483-5A patent/BRPI1008483B1/en not_active IP Right Cessation
- 2010-02-17 JP JP2011501607A patent/JP5398820B2/en not_active Expired - Fee Related
- 2010-02-17 KR KR1020117014956A patent/KR101309753B1/en active IP Right Grant
- 2010-02-17 CN CN2010800093913A patent/CN102333894A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311070A (en) * | 2001-02-15 | 2001-09-05 | 刁梦龙 | Composite coating magnesium particles and its preparing method |
| CN101310033A (en) * | 2005-11-25 | 2008-11-19 | 杰富意钢铁株式会社 | Process for producing sintered ore |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106460088A (en) * | 2014-05-12 | 2017-02-22 | 通用电气公司 | Treatments for iron sinter or green mix |
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| JP5398820B2 (en) | 2014-01-29 |
| JPWO2010098329A1 (en) | 2012-09-06 |
| BRPI1008483B1 (en) | 2018-02-14 |
| WO2010098329A1 (en) | 2010-09-02 |
| BRPI1008483A2 (en) | 2016-03-15 |
| KR20110091034A (en) | 2011-08-10 |
| KR101309753B1 (en) | 2013-09-23 |
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