WO2015025501A1 - Procédé de production de scories solidifiées, scories solidifiées, procédé de production d'agrégat brut pour béton et agrégat brut pour béton - Google Patents

Procédé de production de scories solidifiées, scories solidifiées, procédé de production d'agrégat brut pour béton et agrégat brut pour béton Download PDF

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Publication number
WO2015025501A1
WO2015025501A1 PCT/JP2014/004157 JP2014004157W WO2015025501A1 WO 2015025501 A1 WO2015025501 A1 WO 2015025501A1 JP 2014004157 W JP2014004157 W JP 2014004157W WO 2015025501 A1 WO2015025501 A1 WO 2015025501A1
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Prior art keywords
slag
solidified
mold
solidified slag
coarse aggregate
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PCT/JP2014/004157
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English (en)
Japanese (ja)
Inventor
博幸 當房
恵太 田
勇樹 萩尾
渡辺　圭児
桑山　道弘
大輔 今西
Original Assignee
Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to JP2015508916A priority Critical patent/JP6184476B2/ja
Priority to KR1020157036662A priority patent/KR101839667B1/ko
Priority to CN201480045258.1A priority patent/CN105452187B/zh
Publication of WO2015025501A1 publication Critical patent/WO2015025501A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B5/00—Treatment of  metallurgical  slag ; Artificial stone from molten  metallurgical  slag 
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/04—Specific shape of slag after cooling
    • C21B2400/044—Briquettes or moulded bodies other than sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C21B2400/058—Rotating beds on which slag is cooled
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the present invention relates to a solidified slag that solidifies molten blast furnace slag (blast ⁇ furnace slag) on a metal mold and drops the solidified slag (solidified slag) from the mold to produce a plate-like solid slag.
  • a solidified slag produced by the method for producing the solidified slag, a method for producing coarse aggregate for concrete (coarse ⁇ aggregate for concrete) using the solidified slag, and a method for producing the coarse aggregate for concrete It relates to coarse aggregate for concrete.
  • blast furnace slow cooling slag has been applied to coarse aggregate for concrete to replace gravel.
  • Solidifying molten slag in a metal mold yields solidified slag that is larger than granulated slag and smaller than slowly cooled slag, and can be easily crushed by crushing it. Compared to slowly cooled slag, the time for crushing can be shortened, and a desired solidified slag having a particle size of about 20 mm can be easily obtained.
  • Examples of solidifying molten slag using a metal mold include, for example, aggregate for asphalt pavement described in Patent Document 1, a manufacturing method thereof, and asphalt pavement.
  • the molten blast furnace slag is cooled and solidified by flowing it in a single layer on a metal moving mold so that the layer thickness is 10 to 30 mm.
  • the solidified slag is crushed to produce an aggregate for asphalt pavement having a water absorption percentage of 1.5% or less and an abrasion loss of 20% or less.
  • the coarse aggregate for concrete made of slag disclosed in Patent Document 2 is made by pouring molten slag into a metal mold to solidify, crushing the slag obtained after solidification, water absorption of 1.5% or less, and particle size Is adjusted to 5 to 20 mm.
  • the method for solidifying molten slag described in Patent Document 1 is to cool and solidify a molten blast furnace slag by pouring it into a metal moving mold in a single layer so that the solidified thickness is 10 to 30 mm.
  • the method for solidifying molten slag described in Patent Document 1 is to cool and solidify a molten blast furnace slag by pouring it into a metal moving mold in a single layer so that the solidified thickness is 10 to 30 mm.
  • a plate-like solidified slag having a glassy surface on one side is generated.
  • an aggregate is produced by crushing such a plate-like solidified slag, a part of the surface is formed.
  • Coarse aggregate that is glassy is produced.
  • a coarse aggregate having a glassy surface is used as a coarse aggregate for concrete, there is a problem that it is likely to be bleeding when the fresh concrete is solidified. Breathing is a phenomenon in which a part of kneaded water is released and rises to the surface due to sedimentation or separation of a solid material in fresh concrete.
  • the coarse aggregate for concrete disclosed in Patent Document 2 uses blast furnace slag solidified on a metal mold as in Patent Document 1, and the blast furnace slag is crushed to obtain a water absorption of 1.5% or less.
  • a coarse aggregate having a particle size of 5 to 20 mm is used.
  • Molten slag is poured into a metal mold and solidified to a thickness of 20 to 30 mm, and the contact surface with the metal mold is likely to be vitrified as in Patent Document 1.
  • the compressive strength of the concrete blended with the coarse aggregate for concrete of Patent Document 2 (mixcurproportion) and curing period (curing period) of 7 days and 28 days is clear, but breathing is not clear.
  • the present invention has been made to solve the above problems, and a method for producing solidified slag that can be a raw material for high-quality concrete coarse aggregate, and a solidified slag produced by the method for producing solidified slag. Another object is to provide a method for producing a coarse aggregate for concrete using the solidified slag and a coarse aggregate for concrete produced by the method for producing the coarse aggregate for concrete.
  • the gist of the present invention for solving the above problems is as follows.
  • a slag solidification step in which molten blast furnace slag is poured into a moving metal mold, cooled and solidified into a plate shape in the mold, and slag solidified to the inside in the mold.
  • the slag surface temperature is maintained at 900 ° C. or more for 5 minutes or more for 80 area% or more of the mold contact surface during solidification among the surfaces of the solidified slag dropped from the mold.
  • the drop strength (Shatter Index) evaluated by the mass ratio of the sample that does not pass through the 40 mm aperture sieve to the sample before the drop test is 70% or more after the drop test in which the slag sample is dropped 4 times from a height of 2 m.
  • a solidified slag production process including the method for producing a solidified slag according to any one of [1] to [5], a solidified slag crushing process for crushing the produced solidified slag, and a crushed solidified slag
  • the vitreous portion formed on the contact surface of the solidified slag with the metal mold is crystalline while the slag surface temperature is maintained at 900 ° C. or higher for 5 minutes or longer. Since it changes, solidified slag with high drop strength can be obtained.
  • the coarse aggregate for concrete produced by further crushing and classifying the solidified slag produced by the method for producing solidified slag according to the present invention has a small proportion of vitreous portions on the surface, High strength can be obtained stably, and a coarse aggregate suitable for producing high-strength concrete can be obtained.
  • FIG. 1 is a schematic view schematically showing a configuration of an embodiment of a solidified slag production apparatus that realizes a solidified slag production method according to the present invention.
  • FIG. 2 is a schematic view schematically showing a solidified slag holding container in the solidified slag manufacturing apparatus shown in FIG.
  • FIG. 3 is a graph showing the temperature transition at each measurement position when the slag is cooled on a metal mold.
  • FIG. 4 is a schematic diagram showing a one-dimensional heat transfer analysis model of a slag and a mold.
  • FIG. 5 is a graph showing the relationship between the holding time of the slag at a surface temperature of 900 ° C. or more and the glassy area ratio in the mold contact surface during solidification.
  • FIG. 1 is a schematic view schematically showing a configuration of an embodiment of a solidified slag production apparatus that realizes a solidified slag production method according to the present invention.
  • FIG. 2 is a schematic view schematically showing a
  • FIG. 6 is a graph showing the calculation result of the temperature distribution in the thickness direction of the solidified slag.
  • FIG. 7 shows the measured surface temperature of the slag below the solidified slag on the surface layer deposited in the solidified slag holding container 3 minutes after slag storage, and immediately after discharge from the mold at the mold contact surface of the solidified slag and It is a graph which shows the relationship between the calculated value of the slag temperature after hold
  • FIG. 8 is a photograph showing the appearance of the slag before and after the drop strength test when the mold contact surface during solidification is crystalline.
  • FIG. 9 is a photograph showing the appearance of the slag before and after the drop strength test when the mold contact surface during solidification is glassy.
  • FIG. 10 is a graph showing the relationship between the drop strength and the vitreous portion ratio in the mold contact surface during solidification.
  • FIG. 11 is a graph showing the product yield at the time of manufacturing a coarse aggregate of 20 to 5 mm by comparing the example of the present invention with the comparative example.
  • FIG. 12 is a graph showing a comparison of the amount of breathing in concrete using the coarse aggregates of the present invention example and the comparative example.
  • the method for producing solidified slag includes a slag solidification step in which molten blast furnace slag is poured into a moving metal mold, cooled, and solidified into a plate shape in the mold, A slag dropping step in which the slag solidified inside the mold is dropped from the mold by reversing the mold, and a slag that holds the surface temperature of a part or the entire surface of the dropped slag at 900 ° C. or more for 5 minutes or more. And a temperature holding step.
  • FIG. 1 shows an example of a solidified slag manufacturing apparatus that can realize the above-described solidified slag manufacturing method.
  • the solidified slag manufacturing apparatus 1 (FIG. 1) shown in FIG. 1 is made of a plurality of metals having recessed portions 5a (recessed rod parts) into which molten blast furnace slag accommodated in a slag pan 23, that is, molten slag 3 is poured.
  • the mold 5 is supported so as to be able to move around, and the molten slag 3 is poured into the recessed portion 5a while the mold 5 goes around to continuously produce the solidified slag 18.
  • the solidified slag manufacturing apparatus 1 that performs such an operation is provided with a revolving mechanism 7 that revolves horizontally in a state where a plurality of molds 5 are brought close to each other and supported.
  • This circular movement mechanism 7 moves the mold 5 in the circular direction while holding the molten slag 3 poured into the recessed portion 5a while the mold makes one round, and air-cools the air by cooling and solidifying the molten slag 3.
  • a re-inversion unit 15 that re-inverts the mold 5 in the inverted state so that the recessed portion 5a faces upward, and a re-inversion moving unit 17 that moves the re-inverted mold 5 to a portion into which the molten slag 3 is poured. And a cooling device 21 for cooling the inverted mold 5.
  • the re-inversion moving unit 17 may be omitted.
  • the solidified slag manufacturing apparatus 1 is provided with a gutter 20 so that the molten slag 3 can be easily poured into the mold 5.
  • the solidified slag manufacturing apparatus 1 has a pit 19 provided below the casting mold 5 that circulates around the reversal discharge unit 11, and the pit 19 has a solidified slag holding container 22 that can accommodate the solidified slag 18 to be discharged. Has been placed.
  • the solidified slag holding container 22 has a capacity capable of holding the solidified slag 18 in an amount corresponding to the molten slag 3 for one cup of the slag pot 23, and solidifies for one cup of the slag pot 23.
  • the slag 18 may be carried out from the slag dropping position and replaced with an empty solidified slag holding container 22. In this way, even if slag is held in the solidified slag holding container 22 for a long time, the molten slag 3 in the next slag pot 23 is continuously added without causing a waiting time and reducing productivity. Can be processed.
  • the solidified slag holding container 22 has a low thermal conductivity fire resistance of about 5 W / (m ⁇ K) or less. It is desirable to be composed of objects. Further, after the solidified slag 18 is accommodated, the solidified slag holding container 22 is provided with a lid, a simple heating source such as a burner is added to the solidified slag holding container 22, or the pit 19 itself at the slag dropping position. Can be used as a solidified slag holding container, and a mode in which a cover is installed and held after the solidified slag is accommodated can be selected.
  • the orbiting moving mechanism 7 is rotated at a predetermined speed, and the molten slag 3 is poured into the circulating mold 5 at the molten slag inflow portion through the gutter 20.
  • the mold 5 into which the molten slag 3 is poured moves through the air-cooling moving part 9, and the molten slag 3 is cooled by air to become a solidified slag 18 (slag solidification step).
  • the thickness of the solidified slag 18 is 20 mm or more and 30 mm or less. If the thickness of the solidified slag is 20 mm or more, by pulverizing the solidified slag 18, a particle size distribution suitable for a coarse aggregate product having a general coarse aggregate size of 5 to 20 mm, which is widely used, is obtained. Can be obtained. If the thickness of the solidified slag 18 is 20 mm or more, as will be described later, when the solidified slag 18 is charged into the solidified slag holding container 22, the average heat content (average (amount of heat) is sufficiently increased. Therefore, it is possible to raise the slag surface temperature of the mold contact surface to 900 ° C. or higher and hold it for 5 minutes or more simply by keeping the solidified slag 18 warm without adding a heating source.
  • the thickness of the solidified slag 18 is 30 mm or less, the cooling rate of the slag is in an appropriate range, and pore generation inside the slag is suppressed, so the water absorption rate of the coarse aggregate product is reduced to 1.5% or less.
  • This is also preferable for obtaining coarse aggregate particles having a high strength such as a compressive strength of 100 N / mm 2 or more.
  • the mold 5 that has arrived at the reverse discharge unit 11 rotates and reverses in the circumferential direction in the reverse discharge unit 11, and the solidified slag 18 is discharged to the pit 19 or the solidified slag holding container 22 in the pit 19 (slag Dropping process).
  • the mold 5 from which the solidified slag 18 has been discharged moves the reversal moving unit 13 in a reversal state, and is cooled by the cooling device 21 during the movement.
  • the mold 5 that has passed through the inversion moving unit 13 rotates in the circumferential direction in the reinversion unit 15 and reinverts so that the recessed portion 5a faces upward.
  • the molten slag 3 is poured into the re-inverted mold 5 immediately after re-inversion or after moving the re-inversion moving part 17 at the slag inflow portion.
  • the solidified slag 18 discharged into the pit 19 and charged into the solidified slag holding container 22 is laminated in the solidified slag holding container 22 and is a mold of the solidified slag 18 that is reduced during solidification due to the amount of heat held by the solidified slag 18 itself.
  • the temperature of the contact surface rises.
  • the glassy surface of the mold contact surface in the solidified slag 18 can be modified to crystalline (slag temperature holding step).
  • the solidified slag 18 is discharged from the solidified slag holding container 22 to the slag cooling bed 24.
  • the method for producing solidified slag of the present invention has three steps of a slag solidification step, a slag dropping step, and a slag temperature holding step, and among these three steps, the slag temperature holding step is particularly characteristic. This will be described in detail below.
  • the surface temperature of the solidified slag 18 on the atmosphere side is measured using a radiation thermometer, and a thermocouple is installed on the back of the mold, and the temperature transition until the molten slag 3 flowing on the mold is cooled and solidified is measured.
  • the measurement was performed for a case where the solidified slag 18 had a thickness of 23 mm.
  • the measurement results are shown in FIG. FIG. 3 also shows the transition of the slag temperature at the central position in the thickness direction of the slag and the position in contact with the mold 5, which was obtained by heat transfer analysis described later.
  • the initial cooling rate of the slag at the position in contact with the mold 5 is remarkably large due to heat transfer to the mold, decreases to 400 ° C.
  • the temperature of the central part of the slag is slow, and after about 2 minutes, the temperature decreases only to about 1150 ° C., and the atmosphere side surface also decreases only to about 900 ° C. after 2 minutes.
  • the mold contact surface is rapidly cooled, but the thermal conductivity of the slag is as small as 2 W / (m ⁇ K) or less, The heat conduction inside the slag is slow, and the cooling rate other than the mold contact surface is small. Therefore, only the slag on the mold contact surface is quenched and vitrified.
  • the solidified slag 18 after the mold 5 is inverted and dropped from the mold 5 is conveyed one by one, the cooling progresses from the surface during the conveyance, so that the glassy surface remains as it is.
  • vitreous remains, as described above, when used as a coarse aggregate for concrete, there are problems that it is easy to breathe and the yield of the coarse aggregate is reduced. It needs to be modified. Therefore, a temperature maintaining step for modifying the vitreous portion to be crystalline is necessary.
  • ⁇ is the thermal conductivity (W / (m ⁇ K))
  • ⁇ is the density (kg / m 3 )
  • Cp is the specific heat (J / (kg ⁇ K))
  • T is the slag or mold temperature (K )
  • X is the length (m) in the thickness direction
  • t is the time (s).
  • FIG. 4 shows an analysis model
  • FIG. 4 (a) shows a state where slag is accommodated in the mold
  • FIG. 4 (b) shows solidified slag dropped from the mold.
  • the thickness direction of the slag and mold was calculated by dividing the slag into 10 parts and dividing the mold into 10 parts. Only the solidified slag was calculated after dropping from the mold.
  • the heat transfer coefficient hs at the air-slag interface, the heat transfer coefficient hm at the mold-atmosphere interface, and the thermal resistance R at the slag-mold interface are used as parameters, and the calculated temperature matches the measured value in FIG.
  • the parameter values were determined as follows. Since the air-slag interface has a high temperature difference of 1300 K or more in the initial stage, heat radiation was considered.
  • the ambient temperature Ta was assumed to be constant at 293 K and there was no temperature rise. After dropping from the mold, it was assumed that it was in a heat-insulating state, and there was no heat transfer to the outside of the slag.
  • Cp 1039J / (kg ⁇ K) when T ⁇ 1443K
  • Cp 2242.5J / (kg ⁇ K) when 1443K ⁇ T ⁇ 1673K, 1673K ⁇ T ⁇ 1773K
  • Cp 1326 J / (kg ⁇ K).
  • the surface temperature required to crystallize the vitreous part was investigated.
  • the surface temperature of the solidified slag immediately after the slag dropping process varies depending on the slag solidified thickness and the cooling time of the slag until the slag is peeled after the mold is reversed. Therefore, the solidified slag surface temperature is changed by variously changing the solidified slag thickness and the cooling time, and the solidified slag having variously changed surface temperatures is held in the solidified slag holding container for 24 hours, and the solidified slag mold contact surface
  • the relationship between the maximum temperature of the glass and the area ratio of the vitreous part was investigated. As a result, it was confirmed that it is effective to raise the surface temperature to 900 ° C. or higher in order to crystallize the vitreous portion.
  • the solidification slag mold was changed by changing the holding time in the solidification slag holding container under the condition that the solidification thickness of the slag and the cooling time of the slag until the slag was peeled after reversing the mold were fixed.
  • the metal mold 5 is repeatedly wound twice to continuously process 12 tons of molten slag 3 in 6 minutes, and the mold 5 is inverted.
  • the solidified slag 18 is held in the solidified slag holding container 22 disposed at the slag dropping position at that time, and then held for a predetermined time.
  • the solidified slag 18 is immediately discharged to the slag cooling floor 24. Spread and cooled in the atmosphere.
  • the holding time at 900 ° C. or higher it is necessary to specify the time point when the surface temperature on the mold contact surface side of the slag rises to 900 ° C. and the time point when the surface temperature falls below 900 ° C. Therefore, when the surface temperature on the mold contact surface side of the slag rises to 900 ° C., the last solidification slag is stored in the solidified slag holding container, and the surface temperature of the slag on the mold contact surface side reaches 900 ° C. This time was determined by assuming that the surface of the slag is adiabatic boundary condition in the solidified slag holding container in the heat transfer analysis. Moreover, the time when the surface temperature decreased to less than 900 ° C.
  • FIG. 5 is a graph showing the relationship between the glassy area ratio (%) and the time (min) held at 900 ° C. or higher. As shown in the graph of FIG. 5, by holding at 900 ° C. or higher for 5 minutes, the area ratio of the glassy portion of the mold contact surface decreases to about 10%, and even if the holding time is increased, It can be seen that the area ratio does not change greatly. From this, in order to crystallize the vitreous part of the mold contact surface, it was confirmed that it was effective to maintain the surface temperature of the solidified slag at 900 ° C. or more for 5 minutes or more.
  • the reason why the area ratio of the vitreous portion does not greatly decrease from about 10% even if the holding time at 900 ° C. or higher is extended beyond 5 minutes is the solidification that is laminated and deposited in the slag holding container. It is considered that the solidified slag having the mold contact surface facing upward at the outermost layer portion of the slag was not crystallized because the temperature did not rise to 900 ° C. or higher even when the holding time was increased. Therefore, the area ratio of the vitreous portion can be further reduced by installing a lid after the slag is accommodated in the slag holding container or by reheating using a simple heating source such as a burner.
  • the reason why some vitreous slag is crystallized even when the calculated value of the retention time at 900 ° C. or higher is zero is that the lower part of the deposited layer contained in the slag holding container at the initial stage of the slag treatment.
  • the rise in surface temperature progressed within the time until the final solidified slag was accommodated, and the temperature was maintained at 900 ° C. or higher for 5 minutes or longer.
  • the solidified slag accommodated in the slag holding container at the initial stage of the slag treatment has been crystallized by satisfying the crystallization conditions.
  • FIG. 6 shows a calculation result of the temperature distribution inside the solidified slag 18 120 seconds after the molten slag 3 is injected into the mold.
  • the temperature distribution inside the solidified slag is, for example, as shown by a solid line graph in FIG. Since the temperature of the solidified slag immediately after being discharged from the mold is considered to be substantially the same as the temperature of the solidified slag immediately before dropping from the mold, it is indicated as “immediately after being discharged from the mold” in FIG.
  • the temperature of the mold contact surface and the air surface is lowered, but the internal temperature is high. If the solidified slag is dropped into the holding container in this state and stacked one after another, the slag inside the deposited layer becomes a heat-retaining state. Conducted to the air side and the atmosphere side, the entire slag approaches a uniform temperature distribution. The temperature distribution calculation result after 3 minutes is shown by a broken line in FIG. Under these conditions, the temperature of the mold contact surface once lowered also rises to about 1000 ° C.
  • the surface temperature of a part or the whole surface of the solidified slag including the mold contact surface is raised to 900 ° C. or higher. It is essential to hold for more than a minute. This can be performed without using a new heating source by setting the average temperature in the slag thickness direction of the solidified slag discharged from the mold to be over 900 ° C. and laminating the solidified slag in the pit 19 or the solidified slag holding container. I confirmed that there was.
  • ⁇ Temperature by slag lamination> Increasing the surface temperature of the slag to 900 ° C or higher due to the heat content of the solidified slag itself means that the solidified thickness of the solidified slag, the cooling time of the slag until the solidified slag is dropped after inverting the mold, and the solidified slag holding container This is realized by appropriately selecting conditions such as the holding time at. This point will be specifically described below.
  • the slag FIG. 7 shows the relationship between the average thickness and the slag surface temperature in the slag deposit layer in the solidified slag holding container.
  • the surface temperature of “sometimes referred to as subsurface solidified slag” is plotted in FIG.
  • the surface temperature of the solidified slag having an average thickness of 22 mm or more existing under this surface layer was over 900 ° C. in all measured values.
  • the slag thickness on the horizontal axis in FIG. 7 is an average value of values measured after cooling the slag thickness near the surface layer.
  • the solid line shows the calculated value of the temperature of the solidified slag at the mold contact surface, and the temperature immediately after discharge from the mold and the solidified slag under the surface layer in the solidified slag holding container for 3 minutes (180 seconds) It is the temperature after holding.
  • the calculated temperature at the mold contact surface of the solidified slag after being held for 3 minutes exceeds 900 ° C. if the average thickness is 20 mm or more, and the mold contact increases as the average thickness increases. It was found that the temperature at the surface was high.
  • the measured value of the surface temperature of the solidified slag under the surface layer laminated in the holding container tends to be higher as the slag thickness is larger as in the calculation result, and all the solidified slag having an average thickness of 22 mm or more tested After 3 minutes, it was 900 ° C or higher. That is, the surface temperature measurement value of the solidified slag under the surface layer is in good agreement with the calculation result. From the calculation result and the actual measurement value, the solidified slag having an average thickness of 20 mm or more is laminated, and the solidified slag after 3 minutes. It was confirmed that the surface temperature of can be made 900 ° C. or higher.
  • the heat source for raising the surface temperature of the solidified slag is limited to the heat content of the solidified slag itself, it is stored in a solidified slag holding container in order to reduce the influence of heat radiation to the outside. It is necessary to secure a certain amount of solidified slag. Specifically, it is preferable that the solidified slag of 5 tons or more, more desirably 10 tons or more is stacked and accommodated with a thickness of 1 m or more.
  • Plate-shaped solidified slag cast with a metal mold has a larger average solidification rate than slow-cooled slag, and therefore tends to have smaller crystal grains. By relieving and eliminating the residual stress, a material superior in strength characteristics to that of slowly cooled slag can be obtained.
  • the solidified slag produced by the method for producing solidified slag according to the present invention has a drop strength (Shatter Index) defined later which is 70% or more, and the method for producing solidified slag according to the present invention provides a drop strength (Shatter A high-strength plate-like solidified slag having an index of 70% or more is obtained.
  • a drop strength Shatter A high-strength plate-like solidified slag having an index of 70% or more is obtained.
  • plate-shaped solidified slag cast with a metal mold having a drop strength of 70% or more this is crushed and classified to produce slag products such as coarse aggregate for concrete. The yield is improved.
  • the coarse aggregate for concrete having an average compressive strength measured by the method described later of 100 N / mm 2 or more. And is suitable as a raw material for coarse aggregate when producing high-strength concrete.
  • solidified slag was manufactured using the apparatus shown in FIG.
  • the mold 5 is made of cast steel having a trapezoidal shape in plan view, the thickness thereof is 45 mm, the outer dimension of the mold corresponding to the upper base of the trapezoid is 0.7 m, and the outer method of the mold corresponding to the lower base of the trapezoid.
  • the dimension was 1.0 m, and the outer dimension of the mold corresponding to the height of the trapezoid was 2.7 m.
  • template 5 which pours molten slag was 100 mm.
  • the mold 5 was circulated and conveyed by the circulatory movement mechanism 7, and the conveying speed of the circulatory conveyance was 14 m / min at the mold center.
  • molten blast furnace slag 1360 ° C. or higher and 1410 ° C. or lower was flowed into the mold 5 at about 2 ton / min.
  • the mold 5 into which the molten slag 3 has been poured conveys the air-cooled moving part 9 for about 120 seconds ⁇ the length of the air-cooled moving part is 2/3 (240 degrees) of the entire circumference ⁇ . did.
  • the mold 5 was inverted and the solidified slag 18 peeled off from the mold was dropped into the solidified slag holding container 22 arranged in the pit 19.
  • the casting mold 5 from which the solidified slag 18 was discharged was moved while the inversion moving unit 13 was in the inverted state, and was rapidly cooled by injecting cooling water from the upper and lower surfaces at the site where the cooling device 21 was installed.
  • the mold 5 in the inverted state was re-inverted by the re-inversion part 15 and returned to the state in which the original recessed part 5a was directed upward again. Thereafter, molten slag was poured again into the returned mold. The above process was repeated 5 times for one slag pan, and 30 tons of molten slag was continuously processed in 15 minutes.
  • the solidified slag was held in the solidified slag holding container for a predetermined time, and then the solidified slag was discharged from the solidified slag holding container to the slag cooling bed and spread and cooled in the atmosphere.
  • the molten slag temperature is 1385 ° C.
  • the holding time after completion of slag storage in the solidified slag holding container is 10 minutes
  • the average thickness of the solidified slag is 25 mm
  • the solidified slag is held immediately after a predetermined holding time.
  • the solidified slag was discharged from the container to the slag cooling bed, spread and cooled in the atmosphere.
  • the molten slag temperature is 1380 ° C.
  • the average thickness of the solidified slag is 23 mm
  • the solidified slag is dropped from the mold into the pit, and after all the solidified slag has fallen from the mold, the solidified slag is immediately removed with a shovel car. It was taken out from the pit and cooled in the slag cooling bed, and prepared for the treatment of the molten slag in the next slag pan.
  • the solidification thickness of the solidified slag was measured after cooling, it was 20 to 26 mm, and the average thickness was 23 mm. The influence of the solidification thickness on the glassy abundance ratio on the mold contact surface was not in the range of 20 to 26 mm.
  • the ratio of the vitreous portion of the mold contact surface during solidification was evaluated, and the drop strength of the slag was evaluated.
  • the glass contact surface (crystalline) is visually selected from the solidified slag, and on the other hand, the solidified slag produced according to the comparative example is contacted with the mold.
  • a drop test was performed by visually selecting glassy surfaces.
  • FIG. 8A shows the state before the test of the example of the present invention
  • FIG. 8B shows the state after the drop test of the example of the present invention.
  • FIG. 9B shows a state after the drop test of the comparative example.
  • the drop strength (Shatter Index) was measured by the method described below.
  • the apparatus described in JIS M8711 Iron Ore Sinter-Drop Strength Test Method was used as the apparatus for the drop strength test. Using a sample of plate-like solidified slag of 40 to 100 mm (a sample of plate-like solidified slag whose sieve opening passes through a 100-mm sieve and does not pass through a sieve of 40 mm; about 3 kg) Then, a drop test was performed in which the sample was dropped four times. After the drop test, a ratio that was not crushed to 40 mm or less (mass ratio of the sample that does not pass through a sieve having an opening of 40 mm) was obtained, and this ratio was defined as drop strength (Shatter index).
  • Other test conditions were in accordance with the JIS M8711 iron ore sinter ore drop strength measurement method, which is a test method for sintered ore.
  • FIG. 10 shows the result of comparing the relationship between the ratio of the vitreous portion on the mold contact surface and the drop strength S between the inventive example and the comparative example.
  • the ratio of the vitreous portion was reduced from 52 area% in the comparative example to 9 area%, and the drop strength S was improved from 46% in the comparative example to 89%.
  • the area ratio of the vitreous portion of the mold contact surface of the solidified slag is It is preferable that the content be less than 20 area%, more desirably less than 10 area%.
  • the results of the yield of coarse aggregate products of 20 to 5 mm with respect to the solidified slag used as a raw material are shown in FIG.
  • the yield of the coarse aggregate product of the present invention example was 71%, and the comparative example was 65%. That is, the inventive example was 6% higher than the yield of the comparative coarse aggregate product.
  • the water absorption rate of the coarse aggregate of the example of the present invention is 0.9%, which is significantly smaller than the water absorption rate of 3 to 4% of the conventional blast furnace slow-cooled slag coarse aggregate, which is equivalent to that of natural aggregate. Things were obtained.
  • the compressive strengths of the slag coarse aggregates of the present invention and the comparative examples were compared.
  • Samples for compressive strength measurement were cut from large coarse aggregate particles including a flat surface to a size of 10 mm ⁇ 10 mm ⁇ 10 mm using a diamond cutter with the flat surface as the bottom, and an Amsler compression testing machine (universal testing machine) Compressive strength was measured for each of the six samples.
  • the compressive strength of the sample collected from the coarse aggregate of the comparative example has an average value of 50 N / mm 2 and a minimum value of 10 N / mm 2. did.
  • the compressive strength of the samples taken from the coarse aggregate of the present invention example the average value of 167N / mm 2, a minimum value is 80 N / mm 2, a high compressive strength stably is obtained .
  • the concrete was compounded using the slag coarse aggregates of the present invention example and the comparative example, and the characteristics were evaluated.
  • the amount of breathing was compared between the fresh concrete blended with the coarse aggregate of the present invention and the fresh concrete blended with the coarse aggregate of the comparative example.
  • the survey results are shown in FIG. In the present invention example having a small glassy surface, the amount of breathing was smaller than in the comparative example having a large glassy surface.
  • the 28-day strength was 53 N / mm 2
  • the concrete using the coarse aggregate of the present invention example it was 75 N / mm 2
  • the 28-day strength of the concrete using natural limestone coarse aggregate is 72 N / mm 2
  • the concrete using the coarse aggregate of the example of the present invention is compressed higher than the concrete using the natural limestone coarse aggregate. Strength was obtained. Therefore, it can be said that the coarse aggregate of the example of the present invention is a material suitable as a coarse aggregate for high-strength concrete.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention concerne un procédé de production de scories solidifiées à même de servir de matière première pour un agrégat brut de bonne qualité pour du béton, des scories solidifiées produites selon le procédé de production de scories solidifiées, un procédé de production d'agrégat brut pour béton utilisant les scories solidifiées et un agrégat brut pour béton produit selon le procédé de production d'agrégat brut pour béton. Ce procédé de production de scories solidifiées comprend une étape de solidification de scories dans laquelle on verse des scories de haut fourneau (3) dans un état fondu dans une matrice métallique mobile (5) et où on les refroidit de manière à les solidifier en une forme de plaque à l'intérieur de la matrice, une étape de versement des scories où les scories solidifiées vers l'intérieur alors qu'elles sont à l'intérieur de la matrice sont versées de la matrice par retournement de la matrice et une étape de maintien à température des scories où la température de surface est maintenue à 900 °C au moins pendant au moins 5 minutes pour une partie des surfaces de scories ou pour l'ensemble des surfaces des scories versées.
PCT/JP2014/004157 2013-08-20 2014-08-08 Procédé de production de scories solidifiées, scories solidifiées, procédé de production d'agrégat brut pour béton et agrégat brut pour béton WO2015025501A1 (fr)

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JP2015508916A JP6184476B2 (ja) 2013-08-20 2014-08-08 凝固スラグの製造方法及びコンクリート用粗骨材の製造方法
KR1020157036662A KR101839667B1 (ko) 2013-08-20 2014-08-08 응고 슬래그의 제조 방법, 응고 슬래그, 콘크리트용 조골재의 제조 방법, 콘크리트용 조골재
CN201480045258.1A CN105452187B (zh) 2013-08-20 2014-08-08 凝固炉渣的制造方法、凝固炉渣、混凝土用粗骨料的制造方法以及混凝土用粗骨料

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CN113620631B (zh) * 2021-07-27 2022-11-01 湖北大学 一种用于混凝土大骨料生产熔炼过程均匀成型装置

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JP2003082606A (ja) * 2001-09-10 2003-03-19 Kawasaki Steel Corp アスファルト舗装用骨材およびその製造方法ならびにアスファルト舗装
JP2004277191A (ja) * 2003-03-13 2004-10-07 Jfe Steel Kk コンクリート用粗骨材
JP2009227497A (ja) * 2008-03-20 2009-10-08 Jfe Steel Corp 溶融スラグの冷却処理装置および冷却処理方法
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JPH11246244A (ja) * 1997-12-03 1999-09-14 Ebara Corp 廃棄物からのスラグ回収装置
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JPH09156991A (ja) * 1995-09-26 1997-06-17 Rasa Shoji Kk 焼却灰溶融スラグからの人工岩石合成処理法および装置
JP2003082606A (ja) * 2001-09-10 2003-03-19 Kawasaki Steel Corp アスファルト舗装用骨材およびその製造方法ならびにアスファルト舗装
JP2004277191A (ja) * 2003-03-13 2004-10-07 Jfe Steel Kk コンクリート用粗骨材
JP2009227497A (ja) * 2008-03-20 2009-10-08 Jfe Steel Corp 溶融スラグの冷却処理装置および冷却処理方法
US20130175736A1 (en) * 2010-09-27 2013-07-11 Shandong Coking Group Co., Ltd. Method for manufacturing stone material using molten slag
JP2013139358A (ja) * 2011-12-30 2013-07-18 Jfe Steel Corp 高炉水砕スラグ細骨材の製造方法

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TWI659005B (zh) 2019-05-11
TWI613178B (zh) 2018-02-01
KR20160013180A (ko) 2016-02-03
JP6184476B2 (ja) 2017-08-23
TW201802057A (zh) 2018-01-16
TW201512147A (zh) 2015-04-01
KR101839667B1 (ko) 2018-03-16

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