JP2012055788A - Vibrating grizzly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibrating grizzly capable of preventing a problem of breakage due to thermal stress and optimum for particle size regulation in a high-temperature condition.SOLUTION: This vibrating grizzly is composed by mounting a plurality of grizzly units to a grizzly unit mounting frame including a vibrator. Each grizzly unit includes a bar reception part for receiving a plurality of grizzly bars, a vertical piece part rising upward from both its ends, and a bolt fixing part formed by bending the upper end of the vertical piece part outward, wherein the bolt fixing part is fixed at the upper end of the grizzly unit mounting frame by a bolt, and a space for absorbing thermal expansion and thermal deformation is formed between the vertical piece part and the grizzly mounting frame.

Description

  The present invention relates to a vibration grizzly for high temperature slag treatment.

  Conventionally, when separating the metal contained in steelmaking slag discharged at a high temperature of 1200 ° C or higher, as a pre-process of the separation work, the high-temperature slag is allowed to cool in the cooling pit for several hours to a temperature at which there is no danger of steam explosion After the cooling, in order to further proceed the cooling, a cooling step of cooling while sprinkling the cooling water for several hours was necessary. In addition, the slag after the cooling process was then classified and separated from the slag in large chunks, medium chunks and small chunks, while repeatedly passing through a crusher and a magnetic separator. Thus, the separated bullion may not be sufficiently separated from the slag, and it has been difficult to stably obtain a bullion with a high iron content.

  In contrast, the applicant of the present invention can efficiently recover the metal contained in the steel slag without causing a steam explosion or fire, and obtain a metal with a high iron content. Rotary cooler for the purpose of providing a recovery method and a method capable of recovering bullion contained in steelmaking slag without requiring excessive facilities and costs and suppressing dust scattering The steelmaking slag is charged in a high temperature state around 1000 ° C. inside, and by rotating the rotary cooler provided with protrusions on the inner surface of the shell, the steelmaking slag is cooled while applying a crushing action due to a drop impact, The technique which isolate | separates the bullion contained in steelmaking slag is disclosed (patent document 1).

  In the method for separating metal in steelmaking slag described in Patent Document 1, high-temperature steelmaking slag of 1300 to 1500 ° C discharged from the steelmaking process is cooled to 800 to 1250 ° C in a cooling pit (hereinafter referred to as primary cooling). After that, it is put into the rotary cooler through the hopper. At the entrance of the hopper, a lattice-shaped vibrating screen called a vibrating grizzly is installed, and the large ingots in the steelmaking slag are collected here. Next, the steelmaking slag that has passed through the vibration grizzly is charged into the rotary cooler while being in a high temperature state of about 800 to 1250 ° C. by a cutting device such as a vibration feeder. The rotary cooler has a structure having protrusions on the inner surface of the shell, and is cooled to 100 to 300 ° C. while applying a crushing action by dropping impact to the steelmaking slag by rotating the shell (hereinafter referred to as secondary cooling). The bullion contained in the steelmaking slag can be separated. The steelmaking slag thus crushed and separated from the metal is then discharged from the exit chute onto the conveyor.

  FIG. 7 shows a conventional vibration grizzly 3 that is conventionally used for sizing coke and the like at a steel mill. As shown in FIG. 7, in the conventional grizzly unit, a large number of grizzly bars 5 are placed on a pipe 21 fixed to the mounting frame 8 with bolts 9 at a predetermined interval to form a sieve surface. As shown in FIG. 7, the conventional bolt 9 is usually arranged so that both side surfaces of the pipe 21 are fixed to the mounting frame 8 from the horizontal direction.

  However, when the vibration grizzly having the above-described conventional structure is used to collect the large ingot in the high-temperature slag near 1000 ° C., the heat of the slag is transmitted to the pipe 21 via the grizzly bar 5, and the pipe 21 is horizontally oriented. As a result of the thermal expansion, a large thermal stress is applied to the bolt 9 in the horizontal pushing direction, and there is a problem that the mounting portion of the bolt 9 is damaged and the vibration grizzly is easily broken.

JP 2009-127094 A

  The object of the present invention is to solve the above-mentioned problems and to avoid the problem that the mounting portion of the bolt is damaged by thermal stress and the vibration grizzly is easily broken under a high temperature condition exceeding 1000 ° C. It is to provide a vibrating grizzly.

  The vibration grizzly of the present invention made to solve the above problems is a vibration grizzly that is configured by attaching a plurality of grizzly units to a grizzly unit mounting frame having a vibrator, and the grizzly unit includes a plurality of grizzly units. It has a bar receiving portion for receiving a bar, a vertical piece that rises upward from both ends thereof, and a bolt fixing portion that is bent outward at the upper end of the vertical piece, and this bolt fixing portion is attached to a grizzly unit mounting frame. And a gap for thermal expansion and thermal deformation absorption between the vertical piece and the grizzly unit mounting frame.

  According to a second aspect of the present invention, in the vibration grizzly according to the first aspect, a frame stiffening member is provided at a lower portion of the grizzly unit mounting frame.

  According to a third aspect of the present invention, in the vibration grizzly according to the second aspect, a heat insulating cover is provided on the outer surface of the frame stiffening member.

  According to a fourth aspect of the present invention, in the vibration grizzly according to any one of the first to third aspects, the unit mounting frame includes a water cooling mechanism.

  According to a fifth aspect of the present invention, in the vibration grizzly according to any one of the first to fourth aspects, the vibration motor that vibrates the vibration grizzly includes a water cooling mechanism.

  The invention according to claim 6 is characterized in that, in the vibration grizzly according to any one of claims 1 to 5, the lattice spacing of the plurality of grizzly bars held by each grizzly unit is 10 to 35 mm. is there.

  A seventh aspect of the present invention is the vibration grizzly according to any one of the first to sixth aspects, wherein the grizzly bar has a tapered structure.

  The invention according to claim 8 is the vibration grizzly according to claim 1, wherein the vibration grizzly is used for the treatment of the high-temperature slag that primarily cools the high-temperature slag and then performs secondary cooling while moving the inside of the cooling device. In the high-temperature slag treatment apparatus, the vibration grizzly is arranged at the inlet of the cooling apparatus and separates the bulk metal in the slag after the primary cooling.

  The invention described in claim 9 is the vibration grizzly according to claim 8, characterized in that the high-temperature slag is steelmaking slag or hot metal pretreatment slag.

  A tenth aspect of the present invention is the vibratory grizzly according to the eighth aspect, wherein the temperature of the slag after the completion of the primary cooling is 800 to 1250 ° C.

  The vibration grizzly according to the present invention is configured by attaching a plurality of grizzly units to a grizzly unit mounting frame. As described above, by adopting a divided structure composed of a plurality of units, even when a high-temperature slag of 1200 ° C. or higher is charged into the vibration grizzly, the thermal expansion of each unit can be suppressed to a low level. Further, the grizzly unit has a bar receiving portion that receives a plurality of grizzly bars, a vertical piece that rises upward from both ends thereof, and a bolt fixing portion that is bent outward at the upper end of the vertical piece, The bolt fixing portion is configured to be bolted to the upper end of the grizzly unit mounting frame. By adopting the hanging structure that suspends and holds the grizzly bar in this way, a large thermal stress is applied to the bolt in the horizontal direction, the bolt mounting part is damaged, and the vibration grizzly is easily broken. It can be effectively avoided. Furthermore, due to the structure in which a gap for thermal expansion and thermal deformation absorption is provided between the vertical piece and the grizzly unit mounting frame, the side surface of the grizzly unit mounting frame and the side of the grizzly bar receiving portion is caused by thermal expansion and thermal deformation. Preventing contact. Further, a frame stiffening member is provided at the lower part of the frame, and by preventing thermal expansion and thermal deformation of the frame, it is possible to prevent the grizzly unit mounting frame from contacting the side surface of the grizzly bar receiving portion. Yes. Therefore, according to the configuration of the present invention, even when high-temperature slag of 1200 ° C. or higher is put into the vibration grizzly, the problem of damage due to thermal stress can be avoided, and vibration optimal for use under high-temperature conditions Grizzly can be provided.

It is a schematic explanatory drawing of a high temperature slag processing facility. It is explanatory drawing of a grizzly unit. It is a top view of a vibration grizzly. It is AA sectional drawing of FIG. It is a front view of a vibration grizzly. It is a side view of a vibration grizzly. It is explanatory drawing of the conventional vibration grizzly.

Preferred embodiments of the present invention are shown below.
FIG. 1 shows a schematic explanatory diagram of a high-temperature slag treatment facility.

  In the present embodiment, high-temperature slag is caused to flow down from the slag pan 1 to the pit 2 to perform primary cooling first. The high-temperature slag to be treated in the present invention is steelmaking slag discharged from the furnace or pan or hot metal pretreatment slag. Desulfurization slag, etc. are included.

  In addition, although the temperature of the slag discharged | emitted from a furnace or a pan changes with kinds of slag, generally it is 1400-1600 degreeC in steelmaking slag, and is 1200-1400 degreeC in hot metal pretreatment slag.

  The structure of the pit 2 for performing the primary cooling is not particularly limited, but here, a structure in which a slab having a thickness of 0.25 m is laid on the crushed stone layer is adopted. In addition, primary cooling can also be performed using a cooling box. The hot slag is leveled on the pit 2 to a uniform thickness, and large lumps and bullion are removed. Further, cooling water is sprayed from a watering nozzle (not shown). By this primary cooling, the slag temperature is lowered to about 800 to 1250 ° C.

  Next, slag is taken out from the pit 2 with an appropriate device such as a power shovel, and secondary cooling is performed in the cooling device 10. A hopper 11 is installed in the front stage of the cooling device 10, and a sieving grid called a vibration grizzly 3 is provided in an inclined state on the surface thereof. The bulk metal in the slag after the primary cooling is separated by the vibration grizzly 3, and only the small diameter slag that has passed through the vibration grizzly is put into the cooling device 10 by the vibration feeder 13.

  Although various types of cooling devices 10 for secondary cooling can be used, a rotary cooler is used in this embodiment. In this case, the casing 14 is rotated around an axis that is slightly inclined with respect to a horizontal plane, and cooling air spraying means is provided therein. The slag that has reached 800 to 1250 ° C. due to the primary cooling is introduced from the hopper 11, fed into the casing 14 by the vibration feeder 13, and gradually moves toward the outlet 15 as the casing 14 rotates. By the secondary cooling, the slag is cooled to 300 ° C. or less, discharged from the outlet 15 to the inclined conveyor 16, and then conveyed to the product pit 20 via the tripper conveyor 19.

  2 is an explanatory diagram of the grizzly unit, FIG. 3 is a top view of the vibration grizzly, FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, FIG. 5 is a front view of the vibration grizzly, and FIG. A side view is shown.

  As shown in FIGS. 3 to 6, the vibration grizzly 3 of the present invention is configured by attaching a plurality of grizzly units 4 to a grizzly unit mounting frame 8. As described above, by adopting a divided structure composed of a plurality of units, even when a high-temperature slag of 1200 ° C. or higher is charged into the vibration grizzly, the thermal expansion of each unit can be suppressed to a low level.

  As shown in FIG. 2, each grizzly unit 4 includes a plurality of grizzly bars 5 and a grizzly bar receiving base 6 that holds the plurality of grizzly bars. From the viewpoint of preventing clogging of the slag, it is preferable to make the grizzly bar 5 have a tapered structure and the grid interval of the grizzly bar 5 is 10 to 35 mm for secondary cooling of the high temperature slag, and further the grid interval is 20 to 20 mm. It is preferable to be 35 mm.

  As shown in FIG. 4, the grizzly bar receiving base 6 includes a bar receiving portion 63 for receiving a plurality of grizzly bars, a vertical piece 62 rising upward from both ends thereof, and an upper end of the vertical piece being folded outward. And a bent bolt fixing portion 61. By adopting a suspension structure in which the grizzly bar 5 is suspended and held by the grizzly bar support 6 in this way, even when high-temperature slag is thrown on the grizzly bar 5, the horizontal direction with respect to the bolt 9 Therefore, the problem that the mounting portion of the bolt 9 is damaged and the vibration grizzly is easily broken can be effectively avoided. In addition, by avoiding damage due to thermal stress by devising the structural surface in this way, as a material of the vibration grizzly, without using Inconel (registered trademark INCONEL) or Monel (registered trademark MONEL) compatible with high temperatures, It is possible to use a normal SS400 or the like.

  A vibratory grizzly structure comprising a plurality of grizzly units attached to a grizzly unit mounting frame having a vibrator, the grizzly unit comprising a bar receiving portion for receiving a plurality of grizzly bars, and a vertical rising from both ends thereof A bolt fixing portion that is bent outward at the upper end of the vertical piece, and the bolt fixing portion is bolted to the upper end of the grizzly unit mounting frame; and the vertical piece and the grizzly unit mounting frame; A vibration grizzly having a space for thermal expansion and absorption of thermal deformation between them.

  Between the side surface of the vertical piece 62 and the side surface of the grizzly unit mounting frame 8, a gap for absorbing thermal expansion of 3 to 100 mm is provided. If it is less than 3 mm, it is difficult to absorb thermal expansion, and if it exceeds 100 mm, the bolt fixing portion 61 may be thermally deformed by bending stress at high temperatures, which is not preferable. By adopting this structure, the grizzly unit mounting frame 8 and the side surface of the grizzly unit 4 are prevented from coming into contact with each other due to thermal expansion and thermal deformation.

  Further, as shown in FIG. 4, it is desirable to provide a frame stiffening member 81 for suppressing deformation of the grizzly unit mounting frame 8. The thermal expansion and thermal deformation of the frame under high temperature can be suppressed, and the gap for absorbing thermal expansion and thermal deformation can be stably maintained even in a vibration environment under high temperature.

  Further, as a heat-resistant measure suitable for maintaining the rigidity of the grizzly unit mounting frame 8 by slag radiant heat in the high-temperature slag treatment, a heat-resistant cover 82 may be provided on the outer surface of the frame stiffening member 81. Thereby, since radiant heat is suppressed, the strength reduction by the high temperature of the frame stiffening member 81 can be suppressed. The frame stiffening member 81 may be made of, for example, a steel pipe. In the case of a steel pipe, the heat insulating cover also suppresses high temperature oxidation, so that the thickness of the steel pipe frame stiffening member 81 can be prevented, and the high temperature strength reduction of the frame stiffening member 81 can be further suppressed. Further, although not shown in FIG. 4, a heat insulating cover may be provided on the outer surface of the grizzly bar receiving base 6. It is preferable to provide the unit mounting frame 8 with a water cooling mechanism to suppress thermal expansion and thermal deformation of the frame. It is preferable that the vibration motor that vibrates the vibration grizzly has a water cooling mechanism in terms of preventing overheating of the motor due to radiant heat of the high-temperature slag and preventing thermal expansion and thermal deformation of the frame.

DESCRIPTION OF SYMBOLS 1 Slag pan 2 Pit 3 Vibrating grizzly 4 Grizzly unit 5 Grizzly bar 6 Grizzly bar receiving stand 61 Bolt fixing part 62 Vertical part 63 Bar receiving part 8 Grizzly unit mounting frame 81 Frame stiffening member 82 Thermal insulation cover 9 Bolt 10 Cooling device 11 Hopper 13 Vibrating feeder 14 Casing 15 Outlet 16 Inclined conveyor
19 Tripper conveyor 20 Product pit

Claims (10)

A vibratory grizzly structure comprising a plurality of grizzly units attached to a grizzly unit mounting frame having a vibrator, the grizzly unit comprising a bar receiving portion for receiving a plurality of grizzly bars, and a vertical rising up from both ends thereof Having a piece and a bolt fixing portion that is bent outward at the upper end of the vertical piece,
This bolt fixing part is bolted to the upper end of the grizzly unit mounting frame,
A vibration grizzly characterized in that a gap for absorbing thermal expansion is provided between the vertical piece and the grizzly unit mounting frame.   2. The vibration grizzly according to claim 1, further comprising a frame stiffening member at a lower portion of the grizzly unit mounting frame.   The vibration grizzly according to claim 2, further comprising a heat insulating cover on an outer surface of the frame stiffening member.   The vibration grizzly according to any one of claims 1 to 3, wherein the grizzly unit mounting frame includes a water cooling mechanism.   The vibration grizzly according to any one of claims 1 to 4, wherein the vibration motor that vibrates the vibration grizzly includes a water cooling mechanism.   The vibration grizzly according to any one of claims 1 to 5, wherein a lattice interval of a plurality of grizzly bars held in each grizzly unit is 10 to 35 mm.   The vibratory grizzly according to claim 1, wherein the grizzly bar has a tapered structure. The vibration grizzly is
In the high-temperature slag treatment equipment used for the treatment of the high-temperature slag that primarily cools the high-temperature slag and then performs secondary cooling while moving inside the cooling device,
The vibration grizzly according to claim 1, wherein the vibration grizzly is arranged at the inlet of the cooling device and separates the bulk metal in the slag after the primary cooling.   The vibration grizzly according to claim 8, wherein the high-temperature slag is steelmaking slag or hot metal pretreatment slag. The vibration grizzly according to claim 8, wherein the temperature of the slag after the primary cooling is 800 to 1250 ° C.

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