JP2013177291A - Shape control apparatus for solidified slag, shape control method for solidified slag, and solidified slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain slag solidified in such a shape as to yield slag aggregate having a proper shape and a proper grain size distribution after crushing at a low cost, without increasing the solidification thickness of slag beyond necessity.SOLUTION: Different rugged shapes are separately provided to the upper and lower surfaces of solidified slag formed by pouring slag from a blast furnace into a continuously conveyed casting mold. Whereby, since a targeted grain size distribution of slag aggregate can be directly made while suppressing thermal load applied to the casting mold, slag solidified in such a shape as to yield slag aggregate having a proper shape and a proper grain size distribution after crushing at a low cost can be obtained, without increasing the solidification thickness of slag beyond necessity.

Description

  The present invention relates to a solidified slag shape control device and a shape control method for solidifying and molding slag (mineral) discharged in a steel manufacturing process and the like, and a solidified slag solidified by the shape control method.

  Slag discharged in the steel manufacturing process is used as granulated sand or slag aggregate through granulation or slow cooling. In particular, slag aggregates are usually produced having a predetermined particle size distribution (for example, JIS_A5011-1) after gradually cooling and solidifying the slag discharged into the dry pit, followed by crushing and sieving. . In Patent Document 1, molten slag is solidified and formed to have a thickness of 10 mm to 30 mm using a casting machine provided with a metal moving mold to form a dense and high-strength plate-like solidified slag. After that, a method for producing a slag aggregate by crushing and sieving is disclosed.

JP 2003-82606 A

  In general, the aggregate for concrete and the particle size distribution are clearly defined in order to obtain the fluidity required for concrete construction. For this reason, a slag aggregate is adjusted so that it may become a suitable shape and a particle size distribution by performing a crushing process, sieving, etc. FIG. 10 is a schematic diagram showing the particle size distribution and sampling position of the slag aggregate that can be collected from the crushed solidified slag when the slag aggregate is produced from the plate-shaped solidified slag. In FIG. 10, since the corners of the crushed pieces are cut during the crushing and sieving processes, the slag aggregate is shown in a spherical shape. As can be seen from FIG. 10, in consideration of particle size reduction due to crushing, the thickness (solidification thickness T) is about 1.2 to 2.0 times the upper limit of the particle size range of the target particle B of the slag aggregate. ) Slag must be solidified. However, when the solidified thickness of the slag is increased, the cost of the crushing process is increased.

  The present invention has been made in view of the above, and solidifies into a shape in which a slag aggregate having an appropriate shape and particle size distribution after crushing can be obtained at low cost without increasing the solidification thickness of the slag more than necessary. An object of the present invention is to provide a solidified slag shape control device and a shape control method capable of obtaining a solidified slag. Another object of the present invention is to provide a solidified slag capable of obtaining a slag aggregate having an appropriate shape and particle size distribution at low cost after crushing.

  In order to solve the above-described problems and achieve the object, a solidified slag shape control device according to the present invention includes an upper surface of a solidified slag formed by pouring slag from a blast furnace into a continuously conveyed mold, and Means is provided for imparting different uneven shapes to each of the lower surfaces.

  Moreover, in the above invention, the shape control device for the solidified slag according to the present invention, the uneven shape on the upper surface of the solidified slag is given by an operation of mechanically pushing a forming tool, and the uneven shape on the lower surface of the solidified slag is: It is provided by a convex ridge provided at least at one or more places on the bottom of the mold.

  Moreover, the solidified slag shape control device according to the present invention is the above-described invention, wherein the width of the forming tool that gives the uneven shape to the upper surface of the solidified slag is the width of the bottom of the mold that gives the uneven shape to the lower surface of the solidified slag. It is characterized in that the height from the minimum height position is smaller than the width of the convex ridge that is a region exceeding 3 mm.

  Moreover, the shape control apparatus of the solidification slag which concerns on this invention has the shaping | molding apparatus which arranged in multiple numbers the said shaping | molding tool which gives uneven | corrugated shape to the upper surface of the solidification slag on the pressing surface in the said invention.

  Further, the solidified slag shape control device according to the present invention is characterized in that, in the above invention, the tip of the forming tool for imparting a concavo-convex shape on the upper surface of the solidified slag has an acute notch shape, and the concavo-convex shape on the lower surface of the solidified slag is provided. The bottom of the mold to be applied has a curved shape.

  The solidified slag shape control apparatus according to the present invention is characterized in that, in the above-mentioned invention, the interval between the forming tools for imparting the concavo-convex shape on the upper surface of the solidified slag differs depending on the position of the mold in the horizontal direction.

  Further, in the solidified slag shape control apparatus according to the present invention, in the above-described invention, the interval between the forming tools that imparts an uneven shape to the upper surface of the solidified slag as the height from the minimum height position of the bottom of the mold increases. Is narrow.

  Further, the solidified slag shape control apparatus according to the present invention is the above-described invention, wherein the width of the lower portion, which is a region having a height of 0 to 3 mm from the minimum height position, is the maximum of the solidified slag at the bottom of the mold. The solidified thickness is equal to or less than the target value of the solidified thickness, and the position of the lower portion is adjacent to the convex raised portion of the side wall or bottom of the mold.

  The shape control device for solidified slag according to the present invention is the above-mentioned mold, wherein the upper limit value of the particle size of the aggregate collected from the solidified slag formed by the mold is the maximum slag solidified thickness. The volume of the solidified slag that solidifies at the lower part of the solidified slag is 45% or less of the total volume of the solidified slag.

  Moreover, the shape control apparatus of the solidification slag which concerns on this invention provides a different uneven | corrugated shape with respect to each of the upper surface and lower surface of the solidification slag formed by pouring the slag from a blast furnace into the casting_mold | template continuously conveyed. Including steps.

  Further, the solidified slag according to the present invention is characterized by being solidified by the method for controlling the shape of the solidified slag according to the present invention.

  According to the present invention, it is possible to obtain a solidified slag solidified into a shape in which a slag aggregate having an appropriate shape and particle size distribution after crushing can be obtained at a low cost without increasing the solidified thickness of the slag more than necessary. .

FIG. 1 is a schematic diagram showing a schematic configuration of a solidification slag shape control apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view showing particles that can be collected from a solidified slag formed by a mold having two convex ridges. FIG. 3 is a conceptual diagram showing the cooling effect of the slag by the mold shown in FIG. FIG. 4 is a diagram showing the particle size distribution of the coarse aggregate 2005 defined by JIS_A5011-1. FIG. 5 is a diagram showing the volume of a position where coarse particles of solidified slag formed by the mold shown in FIG. 2 are collected. FIG. 6 is a diagram for explaining the arrangement of the convex raised portions of the mold. FIG. 7 is a conceptual diagram showing the cooling effect of the slag by the mold shown in FIG. FIG. 8 is a view for explaining the shape and arrangement of a forming tool for forming irregularities on the upper surface of the slag. FIG. 9 is a diagram illustrating the shape and arrangement of a forming tool for forming irregularities on the upper surface of the slag. FIG. 10 is a diagram schematically showing particles of slag aggregate that can be collected by crushing plate-like solidified slag.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

  First, a schematic configuration of a solidification slag shape control apparatus according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the shape control device 1 includes a casting machine 2 provided with a movable mold 21, and a supply device 4 that supplies molten slag 3 from a blast furnace to the mold 21. The molten slag 3 supplied into the mold 21 is cooled and solidified in the mold 21 to become a solidified slag 5. The mold 21 has at least one convex raised portion at the bottom. A heat recovery device 6 is provided near the casting machine 2. The heat recovery device 6 recovers the sensible heat of the solidified slag 5 discharged from the shape control device 1.

  FIG. 2 is a schematic diagram showing a mold 21 having two protruding ridges A surrounded by a dotted line in the figure and particles B that can be collected from the solidified slag 5 formed by the mold 21. According to this mold 21, as shown in FIG. 2, it is possible to give a thickness difference to the solidified slag 5 to partially reduce the thickness, and to collect coarse particles B1 from a portion where the solidified thickness is thick, Fine particles B2 can be collected from the thinned portion.

  Further, in the mold 21, a low-order part having a height H of 0 to 3 mm from the minimum height position of the bottom part is disposed adjacent to the side wall part D and the convex raised part A of the mold 21. . Further, the width Y of the lower portion is arranged so as to be equal to or less than the target value Tmax of the maximum solidified thickness of the solidified slag. Note that the slag in the mold 21 is more easily cooled as the solidification thickness is thinner or closer to the side wall portion D of the mold 21, and the cooling effect is higher. FIG. 3 is a conceptual diagram showing the cooling effect of the slag by the mold 21, and the arrow in FIG. 3 shows the cooling effect at that position. As shown in FIG. 3, according to the mold 21, cooling is promoted at the periphery of the mold 21. Therefore, if the position adjacent to the periphery of the mold 21 is set as a position where the coarse particles B <b> 1 are collected, The variation in solidification / cooling time due to the difference is alleviated, and the slag aggregate material can be made uniform.

  If the width Y of the lower part of the mold 21 is larger than the target value Tmax of the maximum solidification thickness of the solidified slag, the size of the coarse particles to be collected becomes larger than the upper limit of the required particle size, so secondary crushing is necessary. Thus, the ratio of coarse particles after secondary crushing cannot be controlled to a high level, and crushing costs are increased.

  FIG. 4 is a diagram showing the particle size distribution of the coarse aggregate 2005 (particle size range 20 mm to 5 mm) defined by JIS_A5011-1. The particle size distribution is defined by the relationship between the nominal size of the sieve and the mass fraction that passes through the sieve. When the particle size distribution of the coarse aggregate 2005 is converted into a number ratio using three sizes of particle sizes of 18 mm, 13 mm, and 8 mm as representative dimensions, the number ratio is approximately 2: 5: 13. That is, the number of coarse particles having a particle diameter of 18 mm is as small as 1/10 of the total number. Moreover, even when the particle size distribution is designed so that the coarse particles have the upper limit value in FIG. 4, the mass ratio of coarse particles of 15 mm or more is less than 50%. Thus, since the required amount of coarse particles is small with respect to the whole, the required amount of coarse particles B1 is collected from the thickened portion of the solidified slag 5 formed by the mold 21 to obtain the coarse particles B1. What is necessary is just to form the fine particle B2 by crushing the remaining collected crushed stone and the thinned portion of the solidification to adjust the particle size.

FIG. 5 is a diagram showing the volume of the slag at the position where the coarse particles B1 of the solidified slag 5 formed by the mold 21 shown in FIG. 2 are collected. In FIG. 5, the thickness of the slag at the minimum height position at the bottom is the target value Tmax of the maximum solidification thickness. In the mold 21 of the present embodiment, based on the weight ratio, the volume V (= V ₁ + V ₂ + V ₃ ) of the slag at the position where the coarse particles B1 are collected is 45% or less of the total volume of the solidified slag 5 It is trying to become.

  FIG. 6 is a schematic diagram showing a mold 21 having one convex raised portion A and particles B that can be collected from the solidified slag 5 formed by the mold 21. Here, a region where the height H from the minimum height position of the bottom of the mold 21 is more than 3 mm is defined as a convex raised portion A. FIG. 7 is a conceptual diagram showing the cooling effect of the slag by the mold 21, and the arrow in FIG. 7 shows the cooling effect at that position. In the mold 21 shown in FIG. 6, the lower portion (the position where the height H from the minimum height position of the bottom portion is 0 to 3 mm) is disposed adjacent to the side wall portion D of the mold 21. In addition, the convex raised portion A is arranged so that the width Y of the lower portion of the mold 21 is equal to or less than the target value Tmax of the maximum solidified thickness of the solidified slag. Thereby, the particle size distribution of the aggregate obtained from the solidified slag can be controlled. Furthermore, as shown in FIG. 7, cooling is promoted by the effect that the closer to the side wall portion D, the easier it is to cool at the position where the coarse particles B1 that are most difficult to solidify are collected. Can be mitigated, and the slag aggregate material can be made uniform.

  Moreover, the shape control apparatus 1 of this Embodiment is equipped with the shaping | molding roll 22 which can be raised-lowered up and down according to conveyance of the casting_mold | template 21 as an uneven | corrugated shape provision means of the solidification slag upper surface, and unevenness | corrugation is carried out on the upper surface of the slag in the casting_mold | template 21. Mold. The forming roll 22 has a small diameter to the extent that the slag in the mold 21 can be formed, and a plurality of forming tools are arranged on the pressing surface. Moreover, the some forming roll (221,222) which provides uneven | corrugated shape to each of the vertical direction and horizontal direction of solidification slag is provided. As shown in FIG. 8 and FIG. 9, the forming roll 22 of the present embodiment is provided with an uneven shape in the same direction in the solidified slag 5 so as to illustrate a cross-sectional view of a portion (pressing surface) in contact with the slag of the forming roll 22. A plurality of forming tools 7 are arranged in parallel to provide a mountain-to-valley repetitive shape.

According to such a forming roll 22, a sharp notched uneven shape can be imparted to the solidified slag 5. In order to give a sharp notch-shaped uneven shape, the width W of the molding tool 7 is preferably smaller than the width C of the convex raised portion A provided in the mold 21. Here, the width C of the convex raised portion A is a width of a region where the height H from the minimum height position of the bottom of the mold 21 is more than 3 mm. Further, irregular shape (mountain and interval between peaks of adjacent forming tools ₇₎ X intervals of the forming tools _{7 (X 1, X 2,} X 3, ···) in accordance with, applied to solidify the slag 5 The interval of changes. Thereby, the solidification slag 5 becomes a shape which is easy to crush, and it becomes possible to define more clearly the position which collects coarse particles at the time of crushing.

  Here, the shape of the convex raised portion A of the mold 21 as described above is desirably a relatively gentle convex shape made of a curve in order to prevent the mold 21 from being damaged by thermal stress. Therefore, the mold 21 having a long contact time with the slag and a large heat load is formed to have a gentle convex shape, and only the plate thickness distribution is given to the lower surface of the solidified slag 5. On the other hand, the tip of the molding tool 7 disposed on the molding roll 22 having a short contact time with the slag and a small thermal load is formed into an acute notch shape to give steep irregularities on the upper surface of the solidified slag 5. That is, as shown in FIG. 8 and FIG. 9, the width W of the forming tool that gives the uneven shape to the upper surface of the solidified slag, and the width of the convex raised portion A at the bottom of the mold 21 that gives the uneven shape to the lower surface of the solidified slag. The relationship with C is preferably C> W, the tip of the forming tool 7 has an acute notch shape, and the bottom of the mold 21 preferably has a curved shape. Further, the plurality of molding tools 7 arranged on the pushing surface may be arranged continuously as shown in FIG. 8, or may be arranged at intervals as shown in FIG. And by these combined effects, when the solidified slag 5 is crushed, it is possible to provide the solidified slag 5 with an uneven shape that enables sampling of the slag aggregate having a targeted particle size distribution.

  In this embodiment, as shown in FIGS. 8 and 9, the horizontal position of the mold 21 for collecting the coarse particles B1 and the horizontal position of the mold 21 for collecting the fine particles B2 are Unevenness is formed by the forming roll 22 so as to collect fine particles B2 with respect to the upper surface of the slag immediately above the convex raised portion A, which is determined in advance from the shape of the convex raised portion A. That is, the interval X of the forming tool 7 is reduced so that the interval between the uneven shapes provided by the forming roll 22 becomes smaller as the solidified thickness of the slag in the mold 21 becomes thinner. Thereby, control of the particle size distribution from the coarse grain of the slag aggregate obtained from the solidification slag 5 to a fine grain can be performed from both upper and lower sides.

  As described above, according to the solidification slag shape control device and shape control method of the present embodiment, the solidification thickness of the slag does not increase more than necessary, and the shapes different from each other on the upper surface and the lower surface. By providing the uneven shape, it is possible to directly build the shape and particle size distribution of the slag aggregate while suppressing the thermal load of the mold. Therefore, the slag can be obtained at low cost by solidifying the slag into such a shape that a slag aggregate having an appropriate shape and particle size distribution can be obtained after crushing without increasing the solidification thickness of the slag more than necessary. It is preferable from the two viewpoints of improving the yield of the material and reducing the crushing cost.

  The mold 21 can be made of a metal or a structure having a multi-layered structure with heat resistance and heat insulation, such as inner surface castable construction. Moreover, the shaping | molding means which provides uneven | corrugated shape to the upper surface of a slag is not restricted to the shaping | molding roll 22, For example, the shaping | molding tool etc. of the processing system which raises / lowers up and down to a press shape, and the method of pressing-molding with dead weight may be sufficient. In that case, the uneven shape of the forming means is arranged so that the interval X of the uneven shape becomes smaller as the solidified thickness of the slag in the mold 21 becomes thinner.

  The above embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto, and various modifications according to the specifications are within the scope of the present invention. It is obvious from the above description that various other embodiments are possible within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Shape control apparatus 2 Casting machine 21 Mold 22 Molding roll 3 Molten slag 4 Supply apparatus 5 Solidification slag 6 Heat recovery apparatus 7 Molding tool

Claims (11)

  A solidified slag shape control device comprising means for imparting different uneven shapes to the upper and lower surfaces of the solidified slag formed by pouring slag from a blast furnace into a continuously conveyed mold. .   The concavo-convex shape on the upper surface of the solidified slag is provided by an operation of mechanically pushing a forming tool, and the concavo-convex shape on the lower surface of the solidified slag is provided by a convex raised portion provided at least one place on the bottom of the mold. The shape control apparatus of the solidification slag of Claim 1 characterized by the above-mentioned.   Convex ridges in which the width of the forming tool that gives an uneven shape to the upper surface of the solidified slag is a region where the height from the minimum height position of the bottom of the mold that gives the uneven shape to the lower surface of the solidified slag is more than 3 mm The shape control device for solidified slag according to claim 2, wherein the shape control device is smaller than the width of the portion.   The solidification slag shape control device according to claim 2 or 3, further comprising: a molding device in which a plurality of the molding tools for imparting an uneven shape to the upper surface of the solidification slag are arranged on the pushing surface.   The tip of the forming tool that gives an uneven shape to the upper surface of the solidified slag has an acute notch shape, and the bottom of the mold that gives the uneven shape on the lower surface of the solidified slag has a curved shape. The shape control apparatus of the solidification slag of any one of Claim 2 thru | or 4.   The shape control device for a solidified slag according to claim 4 or 5, wherein an interval between the forming tools for imparting a concavo-convex shape to the upper surface of the solidified slag is different depending on a horizontal position of the mold.   The shape control of the solidified slag according to claim 6, wherein the higher the height from the minimum height position of the bottom of the mold, the narrower the interval between the forming tools that gives the uneven shape to the upper surface of the solidified slag. apparatus.   At the bottom of the mold, the width of the lower portion that is a region having a height from the minimum height position of 0 to 3 mm is equal to or less than the target value of the maximum solidification thickness of the solidified slag, and the position of the lower portion is the The shape control device for a solidified slag according to any one of claims 2 to 7, wherein the shape control device is adjacent to a convex raised portion on a side wall or a bottom of the mold.   When the upper limit of the particle size of the aggregate collected from the solidified slag formed by the mold is the maximum solidified thickness of the slag, the volume of the solidified slag solidified at the lower part of the mold is the total solidified slag. The shape control device for solidified slag according to claim 8, wherein the shape control device is 45% or less of the volume.   A method for controlling the shape of solidified slag, comprising the step of imparting different uneven shapes to the upper and lower surfaces of the solidified slag formed by pouring slag from a blast furnace into a continuously conveyed mold. .   A solidified slag formed by the solidified slag shape control method according to claim 10.

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