JP3372934B2 - Stainless steel slag processing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment facility for stainless steel slag, and more particularly to a treatment of stainless steel slag that can be suitably used for reusing the stainless steel slag generated during the production of stainless steel. Regarding equipment.

[0002]

2. Description of the Related Art Stainless steel slag generated in an electric furnace, an external refining furnace, etc. has a slag transformation temperature of, for example, 5
It is known that natural pulverization starts at about 00 to 600 ° C and finishes at 400 ° C or lower. Molten stainless steel slag is solidified by air cooling or sprinkling in a slag treatment plant, and then coarsely crushed for open-field or landfill treatment. The stainless steel slag treated in this way becomes extremely powdery when cooled,
In order to prevent the powdery stainless steel slag from scattering, a wet treatment with water spray is indispensable. This wet treatment prevents the powdery stainless steel slag from scattering, but it becomes difficult to recover the stainless steel (hereinafter referred to as the metal) contained in the stainless steel slag, and the powdery stainless steel slag is removed. It is also difficult to reuse as a cement raw material.

As prior art for solving the above problems, Japanese Utility Model Publication No. 59-35548 and Japanese Patent Publication No. 51-
No. 11006 is disclosed. In these prior art, the slag is cooled by air or water spray,
Powdered slag and metal that have been powdered by a vibrating screen or rotary drum, granular metal, and bricks and metal scraps that have not been subdivided and remain as slag lumps are screened to obtain powdered slag and metal. Is being collected. The air and water vapor used for cooling are sucked into the dust collector.

[0004]

The slag powdered by cooling has an average particle size of about 30 μm, and is about 0.1 μm.
It floats in a slight air flow of about m / s. The former prior art, which relies on convective heat transfer by air for cooling, requires large amounts of air. As a result, the pulverized slag is scattered in the air stream, collected by the dust collector and treated as dust, and there arises a problem that the efficiency of collecting the pulverized slag reduced by the sieve decreases.

In order to prevent scattering of powdered slag,
When the amount of air required for cooling is small, it takes a long time to cool and pulverize the slag, and the treatment efficiency decreases. Along with this, before the cooling and pulverization of the slag are sufficiently completed within the predetermined capacity, the pulverized slag and the unpulverized slag are sieved, and the slag that should be recovered as powder is recovered as particles and lumps. Therefore, there is a problem that the recovery efficiency of the powdered slag decreases.

Further, the pulverized slag and the non-pulverized slag are sieved by a vibrating sieve, but when a large amount of the powdered slag is supplied to the vibrating sieve, the vibrating sieve is likely to be clogged, and the powdered slag is liable to be clogged. However, there is a problem that the recovery efficiency of

Further, the latter prior art is characterized by the cooling by direct and indirect water, but not as much as the former,
The powdered slag floats in the air flow that sucks the generated steam, and is similarly carried away to the dust removal system. Although the amount of sucked air must be reduced to reduce the carry-out amount, it deteriorates the surrounding environment.

The object of the present invention is to improve the treatment efficiency of the stainless steel slag, improve the recovery efficiency of the slag powder, and surely recover the slag powder, the slag particles and the slag lumps. It is to provide facilities.

[0009]

The present invention is directed to slag particles having a predetermined particle size range while cooling high temperature stainless steel slag by sucking cooling air, and slag powder having a particle size smaller than the slag particles. And, slag classification means for classifying into a slag mass having a particle size larger than the slag particles, slag powder collecting means for collecting the slag powder classified by the slag classifying means, and slag particles classified by the slag classifying means. Includes a slag particle collecting means for collecting and a slag mass collecting means for collecting the slag mass classified by the slag classifying means, wherein the slag classifying means is formed in a substantially cylindrical shape and is rotatably provided around its central axis. A rotary cylinder having a supply port for supplying the slag and a discharge port for discharging the classified slag mass, the vertical cylinder including the central axis line. And the inner peripheral surface of the rotary cylinder, the lower side intersecting line of the two intersecting lines is provided so as to be inclined downward from the supply port toward the discharge port with respect to the horizontal plane. Connected to the rotary cylinder via a slag powder collecting means and a rotary drive means for rotating the rotary cylinder about its central axis, and cooling air is sucked into the rotary cylinder to cool the slag. Slag cooling means for powdering the slag powder and cooling air by suction to the outside of the rotary cylinder, and a sieve provided on the outlet side of the rotary cylinder and having a plurality of through holes formed along the entire circumference of the rotary cylinder. The inner peripheral surface of the discharge-side end of the rotary cylinder has a slag means in which the inner diameter of the through hole is set to allow passage of slag particles having the maximum particle diameter. Provided with a plurality of weir blades that project radially inward at intervals The blocking blades are provided so as to approach a virtual one plane including the discharge port toward the downstream side in one predetermined rotation direction of the rotary cylinder and be inclined at a predetermined angle with respect to the virtual one plane. It is a stainless steel slag treatment facility characterized in that

According to the present invention, for example, the high temperature stainless steel slag that has been solidified and crushed into lumps is supplied from the supply port of the rotary cylinder which is rotationally driven by the rotary drive means, and is downstream in the rotational direction of the rotary cylinder. The air is cooled by the cooling air sucked by the slag cooling means while moving toward the discharge port while repeatedly rising and sliding down to the side. The cooled stainless steel slag is pulverized from the surface, its floating action in the air flow is promoted, and it is transported together with the air sucked by the slag cooling means and recovered by the slag powder recovery means. The slag particles are passed through the plurality of through holes of the sieving means by the rotation of the rotary cylinder to be sifted off, and are collected by the slag particle collecting means. The slag lump is discharged from the discharge port of the rotary cylinder and collected by the slag lump collecting means. In this way, the stainless steel slag is classified by the slag classifying means and separately collected into slag powder, slag particles and slag mass.

The stainless steel slag is cooled from the surface to a temperature not higher than the slag transformation temperature by cooling air sucked by the slag cooling means, and can be suspended in the air flow by being pulverized. Further, the slag powder is sucked by the slag cooling means and collected by the slag powder collecting means, and the slag particles and the slag mass are screened by the sieving means and collected by the slag particle collecting means and the slag mass collecting means, respectively. It is possible to prevent a large amount of slag powder from being introduced into each of the through holes, and to prevent clogging of the sieving means. In this way, the recovery efficiency for each component of the stainless steel slag can be improved. According to the present invention, when the stainless steel slag is treated, the rotary cylinder is rotationally driven in one predetermined rotation direction. Since each damming blade has an inclined surface facing the downstream side in the one rotation direction inclined upward toward the downstream side in the one rotation direction, the slag mass is dammed by each damming blade. When discharging the blocked slag mass, the rotary cylinder is rotationally driven in the other rotation direction that is the opposite direction to the one rotation direction. Since the inclined surface of each blocking blade facing the downstream side in the other rotation direction is inclined downward toward the downstream side in the other rotation direction, the slag mass is discharged from the rotary cylinder. In this way, the slag mass is intermittently discharged from the rotary cylinder. Since a plurality of dampening blades are provided on the inner peripheral surface of the end of the rotating cylinder on the outlet side, it is possible to selectively switch between blocking and discharging the slag mass depending on the rotation direction of the rotating cylinder. Can be discharged in stainless steel slag processing units. As a result, the slag mass can be efficiently transported. Further, the residence time of the slag mass in the rotary cylinder can be increased, pulverization and granulation can be promoted, and recovery efficiency can be improved.

Further, the present invention is characterized by including a metal collecting means for collecting the granular metal from the slag particles.

According to the present invention, since the valuable metal ingot can be recovered from the slag particles by the ingot recovery means, the stainless steel slag can be treated without waste.

Further, the present invention is characterized in that the rotary cylinder is provided with a lifter means which is provided closer to the discharge port than the supply port, and which projects radially inward from an inner peripheral surface of the rotary cylinder.

According to the present invention, the cooled stainless steel slag reaches the lifter means on the downstream side while being pulverized from the surface, and moves to the lifter means by the circumferential movement of the lifter means as the rotary cylinder rotates. After being scooped up, it falls from the lifter means. The stainless steel slag crushed and fragmented by the impact at the time of dropping increases the cooling efficiency, and promotes natural pulverization and floating action in the air flow.

Since the stainless steel slag is scooped up by the lifter means and then dropped from the lifter means and agitated, the agitation effect accelerates the cooling of the stainless steel slag and promotes natural pulverization. Along with this, the stainless steel slag is forcibly crushed and fragmented by the impact when dropped. By doing so, the cooling treatment efficiency of the stainless steel slag can be improved, and the recovery efficiency of the slag powder and the slag particles can be improved.

Further, the slag cooling means of the present invention is characterized in that cooling air is taken in from the supply port side of the rotary cylinder and suctioned and exhausted from the discharge port side of the rotary cylinder.

According to the present invention, the cooling air sucked by the slag cooling means is taken in from the supply port side of the rotary cylinder, the slag is cooled and pulverized, and the slag powder is discharged from the rotary cylinder. It is sucked and exhausted from the outlet side. That is, the cooling air flows along the traveling direction of the slag. Since cooling air is taken in from the supply port side of the rotary cylinder in which the high temperature slag exists, the high temperature slag can be effectively cooled by the cooling air, and the slag can be efficiently pulverized. You can

Further, the slag cooling means of the present invention takes in the cooling air from the outlet side of the rotary cylinder, sucks and exhausts it from the supply port side of the rotary cylinder, and directs the flow of the cooling air with respect to the traveling direction of the slag. A heat exchanger for recovering waste heat from the cooling air sucked and discharged to the outside of the rotary cylinder is formed between the slag classifying means and the slag powder collecting means. Characterize.

According to the present invention, the cooling air is taken in from the outlet side of the rotary cylinder by the slag cooling means. The taken-in cooling air moves from the supply port side to the discharge port side in the rotary cylinder. The stainless steel slag is cooled by a countercurrent in the direction opposite to the direction in which the slag travels, and while being pulverized, it is suspended in the air flow, and the temperature of the slag is increased by convective heat transfer between the slag and the slag. It is sucked and exhausted from the supply port side as a high-temperature gas mixed with cooling air. The high temperature gas is subjected to waste heat recovery by a heat exchanger and is sucked and exhausted to the slag cooling means. The slag powder in the high temperature gas is recovered by the slag powder recovery means. The heat recovered by the heat exchanger is used in district heating and cooling equipment.

In this way, the cooling air is taken in from the discharge port side of the rotary cylinder by the slag cooling means, cools the slag and is sucked from the supply port side, so that the cooling air flows from the low temperature side of the slag. The slag is cooled by the counterflow toward the high temperature side, and a large amount of heat is taken from the slag to become a high temperature. By recovering waste heat from this high-temperature cooling air with a heat exchanger, the waste heat can be effectively used and energy can be saved.

Further, the rotary cylinder of the present invention is characterized in that the inner diameter thereof is formed so as to decrease from the supply port toward the discharge port.

According to the present invention, the amount of the stainless steel slag supplied to the slag classifying means is reduced by the amount of the slag powder suspended in the air stream as the amount of the stainless steel slag is increased from the supply port to the discharge port of the rotary cylinder. Since the inner diameter of the rotating cylinder is formed so as to decrease from the supply port toward the discharge port, the rotating cylinder corresponds to the amount of stainless steel slag staying that decreases from the supply port toward the discharge port. Therefore, it is possible to reduce the size of the rotary cylinder and reduce the weight of the rotary cylinder. Further, in the configuration of the present invention as set forth in claim 2, the speed of the air sucked by the slag cooling means at the outlet can be made higher than the speed at the inlet, and the slag powder is easily suspended and transported. Therefore, the recovery efficiency of slag powder can be improved.

Furthermore, the present invention further includes an internal water cooling means which is inserted from the supply port of the rotary cylinder and sprays cooling water into the vicinity of the supply port of the rotary cylinder to directly cool the slag. Characterize.

According to the present invention, the stainless steel slag supplied to the slag classifying means is cooled by the cooling water sprayed from the internal water cooling means. The sprayed cooling water removes latent heat of vaporization from the stainless steel slag and directly cools the stainless steel slag.

Since the stainless steel slag is directly water-cooled by the internal water cooling means, the cooling of the stainless steel slag can be enhanced.

Furthermore, the present invention further comprises an external water cooling means which is provided near the supply port of the rotary cylinder and injects cooling water to the outer peripheral surface of the rotary cylinder to indirectly cool the slag. And

According to the present invention, the stainless steel slag supplied to the slag classifying means is cooled by the cooling water sprayed from the external water cooling means to the outer peripheral surface of the rotary cylinder. The cooling water jetted from the external water cooling means to the outer peripheral surface of the rotary cylinder is
The stainless steel slag is indirectly cooled by cooling the peripheral wall near the supply port of the rotary cylinder.

Since the stainless steel slag is indirectly water-cooled by the external water cooling means, the cooling of the stainless steel slag can be enhanced. Further, since the external water cooling means water-cools the rotary cylinder that is rotationally driven, it is possible to prevent local thermal deformation of the rotary cylinder, and to extend the life.

[0030]

[0031]

[0032]

Further, the slag powder collecting means of the present invention comprises:
It is characterized by including a dust collecting means for collecting the slag powder and a plurality of storage means provided below the dust collecting means for storing the collected slag powder according to the type of stainless steel.

According to the present invention, the slag powder collected by the dust collecting means is selectively stored in any storage means by, for example, a screw conveyor. For example, the slag powder stored in one storage means is kneaded while being moistened by a humidification kneader to be formed into pellets, and then reused. The slag powder stored in the remaining storage means is reused in powder form.

Since the slag powder collected by the dust collecting means is arbitrarily stored in a plurality of storing means, it is possible to collect the slag powder having different components depending on the steel type of the refining stainless steel according to the use.

Further, a gas temperature adjusting means is provided between the slag classifying means and the slag powder collecting means of the present invention, and the gas temperature adjusting means measures the temperature of the gas sucked by the slag cooling means. However, the cooling water amount of the internal water cooling means is adjusted so that the temperature of this gas falls within a predetermined temperature range.

According to the present invention, the temperature of the gas sucked from the slag classifying means to the slag powder collecting means by the slag cooling means is measured by the gas temperature adjusting means.
The gas temperature adjusting means adjusts the amount of cooling water of the internal water cooling means according to the measured gas temperature.

Since the temperature of the gas sucked from the slag classifying means to the slag powder collecting means is adjusted within a predetermined temperature range by adjusting the amount of cooling water of the internal water cooling means by the gas temperature adjusting means, it is used as a dust collecting means, for example. It is possible to cope with heat resistance of the bag filter and condensation of gas.

Furthermore, the present invention is characterized in that the stainless steel slag is supplied to the slag classifying means in a molten state.

According to the invention, the stainless steel slag is
The molten state is supplied to the slag classifying means. The supplied molten stainless steel slag is cooled and solidified by the cooling means, and is further cooled after solidification and classified into slag powder, slag particles, and slag mass.

Since the stainless steel slag is supplied to the slag classifying means in the molten state, it is possible to omit the step of once solidifying the stainless steel slag and then roughly crushing the solidified stainless steel slag and supplying it to the slag classifying means. it can. Therefore, the treatment efficiency of the stainless steel slag can be remarkably improved, the area of the slag treatment plant can be reduced, and the space of the treatment equipment can be saved.

[0042]

1 is a system diagram showing the configuration of a stainless steel slag treatment facility 1 according to an embodiment of the present invention. The treatment facility 1 supplies a rotary cooler 7 that is a slag classifying unit that classifies stainless steel slag into slag powder, slag particles, and a slag mass while cooling the stainless steel slag with water cooling and air cooling, and the slag to be classified in the rotary cooler 7. A slag supply device 3, a slag powder collecting means 8 for collecting the slag powder classified by the rotary cooler 7,
A slag particle recovery device 9 which is a slag particle recovery means for recovering granular Ni and Cr (hereinafter referred to as metal) from the slag particles classified by the rotary cooler 7, and a slag mass classified by the rotary cooler 7. The slag mass recovery means 10 is included. The particle size range of the slag particles in the present embodiment is 0.2 mm or more and 15 mm or less, the slag powder is a powder slag having an average of 30 μm, and the slag mass has a particle size larger than the upper limit particle size of the slag particles. It is a massive slag that has.

The slag supply device 3 has a charging hopper 4 into which coarsely crushed slag is charged, and an apron feeder 5 for horizontally conveying the slag charged into the charging hopper 4.
The bucket elevator 6 conveys the slag conveyed by the apron feeder 5 vertically upward.

FIG. 2 is a front view showing a simplified structure of the rotary cooler 7, and FIG. 3 is a vertical sectional view showing a simplified structure of the rotary cooler 7. The rotary cooler 7
A rotary cooler main body 25 which is a rotary cylinder, a rotation driving means 26, a water cooling means 27, a plurality of lifters 28 which are lifter means, a rotary sieve 29 which is a sieve means, a plurality of blocking blades 30 and slag cooling. And means 21.
The rotary cooler main body 25 is a substantially cylindrical steel tubular body, and is rotatably supported around the central axis L1.
Further, the rotary cooler body 25 has a supply port 31 for supplying the slag and a discharge port 32 for discharging the remaining lump slag, and the bottom portion L2 of the bus bar is downward from the supply port 31 toward the discharge port 32. It is installed to be inclined. That is, in the rotary cooler body 25, the lower side intersection line L2 of the two intersection lines formed by the vertical plane including the central axis L1 and the inner peripheral surface of the rotary cooler body 25 is supplied to the horizontal plane. It is provided so as to be inclined downward from the mouth 31 toward the outlet 32.

The rotation driving means 26 includes an electric motor 36,
It includes a speed reducer 37 that reduces the rotational speed of the electric motor 36, and a pinion 38 that is provided on the output shaft of the speed reducer 37 and that meshes with a large gear 39 that is provided on the outer peripheral surface of the rotary cooler 25. The rotary motion by the electric motor 36 is reduced by the speed reducer 37.
Is transmitted to the pinion 38 via the pinion 38, and is transmitted to the large gear 39 via the pinion 38. As a result, the rotary cooler body 25 is rotationally driven around the central axis L1. The rotation speed of the rotary cooler body 25 is, for example, 1 rpm.

The water cooling means 27 is a first internal water cooling means.
It comprises a water cooling means 53 and a second water cooling means 54 which is an external water cooling means, and comprises a spray pipe 41, an injection pipe 42, and a first pipe.
The valve 43, the second valve 44, the pump 45, and the cooling water source 46 are included. The spray pipe 41 is inserted from the supply port 31 substantially coaxially with the central axis L1 of the rotary cooler body 25, and has a plurality of nozzles 41a for spraying cooling water to the inside 47 near the supply port 31 of the rotary cooler body 25. . The injection pipe 42 is provided so as to face the outer periphery of the rotary cooler body 25 near the supply port 31.
The rotary cooler body 25 has a plurality of jet nozzles 42 a for jetting cooling water on the outer peripheral surface thereof. First valve 43
Is interposed in a conduit 48 connected to the base end of the spray pipe 41, and is driven by an electric motor 49. The second valve 44 is interposed in a pipe line 50 connected to the injection pipe 42 and driven by an electric motor 51. Pump 45
Is interposed in the pipe 59 provided between the connection point 52 of the pipes 48 and 50 and the cooling water source 46.

The cooling water pumped up from the cooling water source 46 by the pump 45 is supplied to the spray pipe 41 through the conduits 59, 48 and the first valve 43. The cooling water supplied to the spray pipe 41 is sprayed to the inside 47 via each nozzle 41a, and directly cools the slag. Further, the cooling water pumped up from the cooling water source 46 by the pump 45 is supplied to the injection pipe 42 through each of the conduits 59, 50 and the second valve 44. The cooling water supplied to the jet pipe 42 is jetted to the outer peripheral surface of the rotary cooler body 25 via each jet nozzle 42a.

Here, the first water cooling means 53 is the spray pipe 4
1, a pipe line 48, a first valve 43, a pipe line 59, a pump 45, and a cooling water source 46. Second
The water cooling means 54 includes an injection pipe 42, a pipe line 50, and a second pipe.
Valve 44, conduit 59, pump 45, cooling water source 4
And 6 are included.

The slag cooling means 21 includes a suction fan 69 and pipe lines 74 and 75. The suction fan 69 is connected to the rotary cooler body 25 via a pipe line 75, a filter dust collector 70, and a pipe line 74, which will be described later, and takes in cooling air from the supply port 31 side of the rotary cooler body 25 and discharges the rotary cooler body 25. The gas in the rotary cooler 7 is sucked by sucking and exhausting from the outlet 32 side. The pipe line 74 connects the exhaust port 32 side of the rotary cooler main body 25 and the filter dust collector 70. The pipe line 75 includes the upper part of the filter dust collector 70 and the suction fan 6.
9 is connected to the suction port 69a.

FIG. 4 is a sectional view taken along the section line IV-IV in FIG. The plurality of lifters 28 are flat plate-shaped members made of steel, and the rotary cooler main body 25 is more than the water cooling means 27.
Is provided on the discharge port 32 side, protrudes inward in the radial direction from the inner peripheral surface 25a of the rotary cooler body 25, and is provided at intervals in the circumferential direction and the axial direction. In the embodiment of the present invention, each lifter 28 is provided in the circumferential direction, for example, at every angle θ4 = 45 °. Also, each lifter 28
Are provided in the axial direction, for example, at every pitch L10 = 300 mm.

FIG. 5 is a sectional view taken along the section line VV of FIG. The rotary sieve 29 is provided closer to the outlet 32 of the rotary cooler body 25 than the plurality of lifters 28 and over the entire circumference in the circumferential direction near the outlet 32 of the rotary cooler body 25, and has a plurality of through holes 56. The inner diameter D2 of each through hole 56 is set so that the slag particles having the maximum particle diameter can pass through,
For example, it is 20 mm.

FIG. 6 is a side view showing the lower left portion of the rotary cooler 7 as viewed from the discharge port 32 side when the rotary cooler main body 25 is rotationally driven in the forward rotation direction A which is one predetermined rotation direction. FIG. 7 is a section line VII- of FIG.
FIG. 8 is a cross-sectional view as seen from VII, and FIG. 8 shows a lower right portion of the rotary cooler 7 as seen from the outlet 32 side when the rotary cooler body 25 is rotationally driven in the reverse rotation direction B which is the other rotation direction. FIG. 9 is a side view, and FIG. 9 is a sectional line I of FIG.
It is sectional drawing seen from X-IX. A plurality of blocking blades 30
Are provided on the inner circumferential surface 25a of the end portion of the rotary cooler body 25 on the discharge port 32 side so as to project inward in the radial direction at intervals in the circumferential direction. In the embodiment of the present invention, each blocking vane 30 has, for example, an angle θ1 = 10 in the circumferential direction.
It is provided every °. In addition, the plurality of blocking blades 30 approach the virtual one plane 58 including the discharge port 32 toward the predetermined forward rotation direction A downstream side of the rotary cooler main body 25, and a predetermined angle θ2 with respect to the virtual one plane 58. ,
For example, it is provided with an inclination of 45 °.

The region of the rotary cooler body 25 where the water cooling means 27 is provided is called a water cooling region, the region of the rotary cooler body 25 where a plurality of lifters 28 are provided is called an agitated air cooling region, and the rotary sieve 29 of the rotary cooler body 25 is The area provided is called a sieving area, and the area of the rotary cooler body 25 where the plurality of blocking blades 30 are provided is called a blocking area.

Here, as an example of the dimensions of the rotary cooler 7, the outer diameter D1 is, for example, 3 m, the axial length L5 is, for example, 16 m, and the water cooling area length L6 by the water cooling means 27 is, for example, 4 m, the stirring air-cooling region length L7 by the plurality of lifters 28 is, for example, 8 m, the sieving region length L8 by the rotary screen 29 is, for example, 1 m, and the blocking region length by the plurality of blocking blades 30 is 4 m. The length L9 is, for example, 1 m.

Referring to FIG. 2, the rotary cooler main body 25
An inlet housing 61 is provided at a position facing the supply port 31, and the inlet housing 61 is provided with a slag supply pipe 60 and an air intake port 62 for taking in outside air. The slag supply pipe 60 connects the stainless steel slag discharged from the chute 20 of the bucket elevator 6 to the rotary cooler body 2
Supply to 5. The area including the sieving area and the damming area of the rotary cooler body 25 is surrounded by the outlet housing 63. The rotary cooler body 25 and the inlet housing 61 are airtightly provided. Referring to FIG. 10, outlet housing 63 and rotary cooler body 25 are slidably and airtightly coupled via bush 64.

With reference to FIG. 1, the slag powder collecting means 8 comprises:
It is configured to include a dust collecting unit 65, first and second slag powder storage bins 66 and 67 that are storage units, and a humidification kneader 68. The dust collecting means 65 collects the slag powder classified by the rotary cooler 7 by suction of the suction fan 69. More specifically, the dust collecting means 65 includes a filter dust collector 70 and a screw conveyor 71. The filter dust collector 70 collects the slag powder from the gas sucked by the suction fan 69 into a plurality of bag filters 70a.
Capture and collect by. The screw conveyor 71 is
The slag powder provided in the lower part of the hopper 70b of the filter dust collector 70, brushed off from the bag filter 70a by backwash and stored in the hopper 70b is selectively conveyed to the first and second slag powder storage bins 66, 67. To do.

First and second slag powder storage bins 66, 6
7 is provided below the screw conveyor 71 and stores the collected slag powder, respectively. Rotary feeders 72 and 73 are provided below the first and second slag powder storage bins 66 and 67, respectively. Below the second slag powder storage bin 67, a humidifying and kneading machine 68 for kneading while storing the stored slag powder is provided.

The outlet housing 63 and the filter dust collector 70 are hermetically connected by a pipe line 74. The conduit 74 is
A part thereof is inserted into the rotary cooler main body 25 through the discharge port 32. The upper part of the filter dust collector 70 and the suction fan 69
The suction port 69a is connected to the suction port 69a in a gas-tight manner by a pipe line 75. The outlet 69b of the suction fan 69 is connected to the chimney 80. The suction fan 69 takes in air from the air intake port 62 and introduces air into the inlet housing 61 and the rotary cooler main body 2.
5, the air is sucked through the outlet housing 63, the pipe 74, the filter dust collector 70 and the pipe 75, and the sucked air is discharged from the chimney 80.

Referring to FIG. 1, the slag particle collecting apparatus 9 is
The chute 76 and the belt conveyor 77 are included. The chute 76 is provided in the lower portion of the outlet housing 63, and is arranged so as to face the sieving region of the rotary cooler body 25. The belt conveyor 77 is provided below the chute 76 and conveys the slag particles discharged from the chute 76. The magnetic separator 78, which is a means for collecting metal, is interposed in the conveyance path of the belt conveyor 77, and the magnetic force causes Cr
Selectively recover the system-based metal and Ni-based metal.

FIG. 10 is a sectional view showing a simplified structure in the vicinity of the outlet housing 63. Slag mass recovery means 10
Includes a hopper 81 and a counter damper 82. The hopper 81 is provided in the lower part of the outlet housing 63, and is arranged so as to face the discharge port 32 of the rotary cooler body 25. The counter damper 82 is provided in the lower part of the hopper 81, is integrally provided on a swing shaft 83a of the damper 83 and a damper 83 that is swingably provided to open and close a lower passage of the hopper 81, and has a predetermined weight. Weight 8 with
4 and. In the natural state, the counter damper 82 closes the lower passage of the hopper 81 until the weight of the slag mass reaches a value balanced with the weight of the weight cone 84.

Next, the operation of the processing equipment 1 will be described. The stainless steel slag is treated according to the type of stainless steel. Solidified at the slag processing plant, 100 mm
The massive stainless steel slag roughly crushed in the front and back is charged into the charging hopper 4 by the power shovel 90. The massive stainless steel slag stored in the charging hopper 4 is
It is conveyed by the apron feeder 5 and supplied to the boots 17 of the bucket elevator 6. The stainless steel slag supplied to the boot 17 is conveyed upward while being housed in a plurality of buckets (not shown), and is discharged from the chute 20. The massive stainless steel slag discharged from the chute 20 is supplied to the rotary cooler body 25 via the slag supply pipe 60. At this time, the internal temperature of the massive stainless steel slag is, for example, about 800 ° C.

The lump-shaped stainless steel slag supplied to the rotary cooler body 25 is rotatably driven in the forward rotation direction (clockwise in FIG. 4) by the rotation driving means 26 so that the lump-shaped stainless steel slag is rotated by the rotation of the rotary cooler body 25. Due to the friction between the rotary cooler body 25 and the rotary cooler body 25, the downstream side in the normal rotation direction A of the rotary cooler body 25 is inclined and stored so as to be higher than the upstream side. The massive stainless steel slag that is stored in a tilted manner moves toward the discharge port 32 side due to the tilt of the rotary cooler body 25 while sliding down due to the action of gravity. In this way, the lump-shaped stainless steel slag is repeatedly lifted and slid down toward the downstream side in the rotational direction by the action of frictional force and gravity so as to follow the inclination of the rotary cooler main body 25, and then the discharge port 32.
Move towards.

Further, the massive stainless steel slag thus moving is subjected to water cooling treatment in the water cooling region. That is, this massive stainless steel slag is
Cooling water sprayed from the spray pipe 41 and the injection pipe 4
2 and the cooling water sprayed on the outer peripheral surface of the rotary cooler body 25. The cooling water sprayed from the spray pipe 41 removes latent heat of vaporization from the stainless steel slag and directly cools it. The cooling water jetted from the jet pipe 42 to the rotary cooler body 25 cools the peripheral wall in the water cooling region near the supply port 31 of the rotary cooler body 25 and indirectly cools the stainless steel slag. This causes the massive stainless steel slag to cool rapidly and spontaneously powder from the surface.

The lump-shaped stainless steel slag water-cooled in the water-cooling region is pulverized and is lifted by a plurality of downstream lifters 2.
When the rotary cooler main body 25 rotates, the lifters 28 are scooped up by the lifters 28 by the circumferential movement of the rotary cooler body 25 and then fall from the lifters 28. This agitates the stainless steel slag. The dropped stainless steel slag is compulsorily fragmented by the impact when falling.

The agglomerated stainless steel slag that has been subdivided and agitated is efficiently air-cooled to promote the natural pulverization of the agglomerated stainless steel slag. In this way, in the stirring air-cooling region of the rotary cooler main body 25, the massive stainless steel slag is classified into slag powder, slag particles, and slag lumps, and the slag powder is sucked by the suction fan 69 and each of the filter dust collectors 70. It is collected by the bag filter 70a.

The slag particles and the slag lumps that do not float in the air flow and remain in the stirring air-cooling region of the rotary cooler body 25 move to the sieving region and are sieved by the rotary sieve 29. The slag particles are passed through the plurality of through holes 56 of the rotary sieve 29 and sieved by the rotation of the rotary cooler body 25, and are collected by the slag particle collecting device 9. That is, the slag particles that have been sieved off by the rotary sieve 29 are taken by the chute 76.
And is supplied to the belt conveyor 77 via. The slag particles supplied to the belt conveyor 77 are
While being transported by the magnetic separator 78, the magnetic separator 78 selects the Cr-based metal and the Ni-based metal.

The slag mass remaining in the sieving area is
It moves in the direction approaching each blocking blade 30 provided in the blocking region. The slag mass that has moved to the blocking area is shown in FIG.
And as shown in FIG. 7, the rotary cooler body 25
Is rotated in the forward rotation direction A, and is guided to the inclined surface 91 of each blocking blade 30 facing the downstream side in the forward rotation direction A. Since this inclined surface 91 is inclined upward toward the discharge port 32, the slag mass is guided to the supply port 31 side and blocked by each blocking blade 30. In this way, the slag mass is prevented from being discharged from the rotary cooler 7 during the processing of the stainless steel slag.

After discharging the stainless steel slag, when discharging the slag mass, as shown in FIGS. 8 and 9,
The rotary cooler body 25 is rotationally driven in a reverse rotation direction B (counterclockwise direction in FIG. 8) which is a direction opposite to the normal rotation direction A. As a result, the slag mass that has moved to the blocking region is guided to the inclined surface 92 facing the downstream side in the reverse rotation direction B of each blocking blade 30. Since this area surface 92 is inclined downward toward the discharge port 32, the slag mass is guided to the discharge port 32 side, and the rotary cooler main body 25
Emitted from. In this way, the slag mass is intermittently discharged from the rotary cooler body 25.

As shown in FIG. 10, the slag mass discharged from the rotary cooler 7 is stored in the hopper 81. When a predetermined amount of slag mass is stored in the hopper 81,
The counter damper 82 operates to open the lower passage of the hopper 81, and the slag mass is discharged from the hopper 81.

Referring to FIG. 1, the slag powder floating in the air sucked by the suction fan 69 is guided to the filter dust collector 70 through the pipe line 74 inserted from the discharge port 32 of the rotary cooler body 25. . The slag powder guided to the filter dust collector 70 is captured by the bag filter 70a. The air from which the slag powder has been removed by the bag filter 70a is sucked by the suction fan 69 from the upper portion of the filter dust collector 70 through the pipe line 75 to the suction fan 69, and the discharge port 69a.
It is emitted from b through the chimney 80 to the atmosphere. The slag powder captured by the bag filter 70a is washed off from each bag filter 70a by backwashing as described above, and is stored and collected in the hopper 70b provided in the lower portion of the filter dust collector 70. The slag powder stored in the hopper 70b is selectively supplied by the screw conveyor 71 to the slag powder storage bins 66 and 67 according to the type of stainless steel. The slag powder stored in the first slag powder storage bin 66 is supplied to the transport vehicle 93 such as a truck via the rotary feeder 72 in a predetermined amount in powder form. The slag powder stored in the second slag powder storage bin 67 is supplied to the humidifying and kneading machine 68 by a predetermined amount through the rotary feeder 73, and is kneaded while being moistened at, for example, 10 to 20% by weight, for example, 5 to 25 mm. It is processed into pellets and discharged. In this way, the slag powder is recovered so that it can be reused according to the purpose.

FIG. 11 is a system diagram showing the structure of the main part of the stainless steel slag treatment facility 1. A conduit 96 is connected to the conduit 74 at a connection point 95. A cold air intake damper 98 driven by an electric motor 97 is interposed in the conduit 96. Suction fan 69 and chimney 80
And are connected by a conduit 99. A suction amount adjustment damper 1 driven by an electric motor 100 is provided in the pipe line 99.
01 is interposed.

A gas temperature adjusting means 105 is provided in a pipe line 74 between the connection point 95 and the filter dust collector 70. The gas temperature adjusting means 105 includes a temperature sensor that measures the temperature of the gas sucked by the filter dust collector 70, and a control circuit that controls the drive of the electric motors 49 and 97 based on the output of the temperature sensor. Composed. Therefore, the gas temperature adjusting means 105 measures the temperature of the gas sucked into the filter dust collector 70, and adjusts the amount of cooling water of the first water cooling means 53 so that this temperature falls within a predetermined temperature range, for example, 120 to 180 ° C. The amount of cold air is adjusted by adjusting the opening degree of the cold air intake damper 98.

The specifications of the bag filter 70a used in the filter dust collector 70 are as shown in Table 1, for example.

[0074]

[Table 1]

The air sucked by the suction fan 69 passes through the rotary cooler 7 to suspend the slag powder. At this time, the flow velocity of the gas containing air containing the slag powder is about 4 m / s. When the gas flow rate is about 4 m / s, the equivalent suspended particle size of the slag powder is 400 μm.
It is a degree.

This gas is passed through the pipe 74 to the filter dust collector 7
Aspirate to zero. The temperature of this gas is measured by the gas temperature adjusting means 105. If the temperature of this gas exceeds the upper limit of the predetermined temperature range, there is a problem that the filter cloth of the bag filter is damaged. If the temperature of the gas is less than the lower limit value of the predetermined temperature range, water vapor in the gas will condense on the filter cloth, and the filter cloth will be moistened.
Therefore, when the temperature of the gas is out of the predetermined temperature range, the gas temperature adjusting means 105 controls the electric motor 49 of the first valve 43 to increase or decrease the amount of cooling water supplied to the spray pipe 41.

Further, when the temperature of the gas exceeds the upper limit temperature, the drive of the electric motor 97 of the cold air intake damper 98 is controlled to open the cold air intake damper 98 to cool the cold air through the conduit 96.
To reduce the temperature of the gas.

By adjusting the temperature of the gas in this way, troubles in the slag powder recovery system can be prevented.

In such a stainless steel slag treatment facility 1, for example, when treating 50 tons of stainless steel slag, 38 tons can be recovered as slag powder and 2 tons can be recovered as slag particles. 10
Tons can be recovered as a slag mass.

The stainless steel slag is water-cooled by the water-cooling means 27 and is constantly air-cooled by the cooling air taken in from the supply port 31 side by the suction fan 69 and sucked and exhausted from the discharge port 32 side. It is possible to cool the slag to below the slag transformation temperature in a short time and to pulverize it. Further, since the stainless steel slag is scooped up by the plurality of lifters 28 and then dropped and stirred, the cooling effect of the stainless steel slag is promoted by this stirring effect and natural powdering is promoted. Along with this, the stainless steel slag is comminuted compulsorily due to the impact when dropped. By doing so, the cooling efficiency of the stainless steel slag can be improved, and
The recovery efficiency of slag powder and slag particles can be improved. Further, the slag powder is sucked by the suction fan 69 and collected by the slag powder collecting means 8, and the slag particles and the slag mass are sieved by the rotary sieve 29 and collected by the slag particle collecting device 9 and the slag mass collecting means 10, respectively. Therefore, it is possible to prevent a large amount of slag powder from being introduced into each through hole 56 of the rotary sieve 29, and prevent the rotary sieve 29 from being clogged. In this way, the recovery efficiency of the slag powder can be improved, and the slag powder, the slag particles, and the slag mass can be reliably recovered.

Since the stainless steel slag is directly water-cooled by the first water cooling means 53, the cooling of the stainless steel slag can be enhanced. Further, since the second water cooling means 54 water-cools the rotary cooler main body 25 that is rotationally driven,
The slag is indirectly cooled, and local thermal deformation of the rotary cooler body 25 can be prevented, so that the service life can be extended.

Since a plurality of damming blades 30 are provided on the inner peripheral surface 25a of the end of the rotary cooler body 25 on the discharge port 32 side, damming and discharging of the slag mass can be selectively performed depending on the rotating direction of the rotary cooler body 25. The slag mass can be discharged in units of stainless steel slag processing. As a result, the slag mass can be efficiently transported. Furthermore, the residence time of the slag mass in the rotary cooler main body 25 can be increased, pulverization and granulation can be promoted, and recovery efficiency can be improved.

Since the slag powder collected by the filter dust collector 70 is arbitrarily stored in the slag powder storage bottles 66, 67, it is possible to collect the slag powder having different components depending on the steel type of the refining stainless steel according to the use. Further, since the humidifying and kneading machine 68 is provided below the other slag powder storage bin 67, it is possible to save the trouble of transferring the slag powder to a humidifying and kneading equipment different from the processing equipment 1, and to scatter the slag powder generated during the transportation. It is possible to prevent the deterioration of the environment and easily manufacture a slag product suitable for a reuse application.

Since the temperature of the gas sucked from the rotary cooler 7 to the filter dust collector 70 is adjusted to a predetermined temperature by adjusting the amount of cooling water of the first water cooling means 53 by the gas temperature adjusting means 105, the temperature of the stainless steel slag is adjusted. As a result, pulverization of the stainless steel slag can be promoted, and the temperature can be easily adjusted to a temperature suitable for the operating conditions of the filter dust collector 70.

FIG. 12 is a simplified vertical sectional view showing the structure of a rotary cooler 110 provided in a stainless steel slag processing facility which is still another embodiment of the present invention. In the embodiments of the present invention, parts corresponding to the configurations of the above-described embodiments are designated by the same reference numerals, and description thereof will be omitted. The rotary cooler 110 is similar to the configuration of the rotary cooler 7 shown in FIGS. 1 to 11, and it should be noted that the inner diameter of the rotary cooler main body 111 is from the supply port 31 to the discharge port 32.
The point is that the diameter is reduced as it goes to.
That is, the rotary cooler body 111 is formed in a tapered shape. The stainless steel slag supplied to the rotary cooler 110 is pulverized while moving from the supply port 31 of the rotary cooler body 111 toward the discharge port 32, and the slag powder is suspended in the cooling air sucked by the suction fan 69. Then, it is recovered by the slag powder recovery means 8. As a result, the amount of stainless steel slag is
The amount of the recovered slag powder decreases as it goes from the supply port 31 to the discharge port 32. Therefore, by forming the rotary cooler body 111 in a tapered shape, the rotary cooler body 111 is moved from the supply port 31 to the discharge port 32.
Can be configured so as to correspond to the amount of stainless steel slag that decreases toward the position, and the configuration can be downsized. Along with this, the rotary cooler body 11
The weight of 1 can be reduced. Also suction fan 6
The speed of the cooling air sucked by 9 at the discharge port 32 can be made higher than the speed at the supply port 31, the slag powder can be suspended and easily transported, and the recovery efficiency of the slag powder is improved. Can be achieved.

In the above-described embodiment of the present invention, the rotary coolers 7 and 110 are supplied with coarsely crushed stainless steel slag, but as still another embodiment of the present invention, the rotary cooler is kept in a molten state. 7,
It may be supplied to 110. The stainless steel slag supplied to the rotary coolers 7 and 110 in the molten state is cooled by the water cooling means 27 and solidified. Thereafter, the solidified stainless steel slag is further cooled and classified into slag powder, slag particles and slag mass, which are respectively collected by the slag powder collecting means 8, the slag particle collecting device 9 and the slag mass collecting means 10. Since the stainless steel slag is supplied to the rotary coolers 7, 110 in the molten state in this way, it is possible to omit the step of once solidifying the stainless steel slag and then supplying the solidified stainless steel slag to the rotary coolers 7, 110. Therefore, the treatment efficiency of the stainless steel slag can be remarkably improved, the area of the slag treatment plant can be reduced, and the space of the treatment equipment can be saved.

FIG. 13 is a system diagram showing the configuration of the main part of a stainless steel slag treatment facility 120 which is still another embodiment of the present invention. In the embodiments of the present invention, portions corresponding to the configurations of the above-described embodiments are designated by the same reference numerals, and description thereof will be omitted. The stainless steel slag treatment equipment 120 is similar to the configuration of the stainless steel slag treatment equipment 1 shown in FIGS. 1 to 12, and it should be noted that
Unlike the slag cooling means 21 shown in FIG. 1, the slag cooling means 130 has one end of the pipe 125 connected to the supply port 31 side of the rotary cooler body 25, and the rotary cooler 7 and the slag powder recovery means 121. Filter dust collector 7
That is, a waste heat boiler 122, which is a heat exchanger, is provided between the waste heat boiler 122 and zero. The slag powder collecting means 121 is shown in FIGS.
In the configuration of the slag powder collecting means 8 of the embodiment shown in
Further, the hot cyclone 123 and the fine powder cooler 124 are added.

The hot cyclone 123 is connected to the inlet housing of the rotary cooler 7 on the side of the supply port 31 by a pipe 125, and centrifugal dust is collected from the high temperature gas in which the high temperature cooling air after slag cooling and the slag powder are mixed. Collect the slag powder in the gas. The fine powder cooler 124 temporarily stores and cools the slag powder collected by the hot cyclone 123. The fine powder cooler 124 is connected to each of the bins 66 and 67 by a transport path 126.

The waste heat boiler 122 is a hot cyclone 1
23 is provided on the downstream side of the gas in the flow-down direction, and the pipeline 12
7 connects to the hot cyclone 123. Further, the waste heat boiler 122 is connected by a pipe line 128 to a filter dust collector 70 provided on the downstream side in the gas flow direction. Further, the waste heat boiler 122 is connected to each of the bins 66 and 67 by the transport path 129.

When the suction fan 69 is driven, cooling air is taken in from the outlet 32 side of the rotary cooler body 25.
The cooling air cools and pulverizes the slag that moves from the supply port 31 side toward the discharge port 32 side by counterflow in a direction opposite to the traveling direction of the slag, and
Float the slag powder in the air stream. The high-temperature gas obtained by mixing the high-temperature cooling air after slag cooling and the slag powder is sucked into the suction fan 6 from the supply port 31 side of the rotary cooler body 25.
9 is sucked and exhausted. That is, the cooling air cools the slag from the low temperature side to the high temperature side of the slag. The temperature of the gas near the supply port 31 is about 600 ° C. The flow velocity of gas near the outlet 32 of the rotary cooler body 25 is about 0.2 m / s, and the flow velocity of gas near the supply port 31 is about 0.6 m / s.

The high temperature gas sucked from the supply port 31 of the rotary cooler body 25 is guided to the hot cyclone 123 via the pipe 125. Most of the slag powder collected by centrifugal collection of the hot cyclone 123 is temporarily stored in the fine powder cooler 124 and cooled, and stored in the bottles 66 and 67 via the transport path 126. The high temperature cooling air from which most of the slag powder has been removed by the hot cyclone 123 is passed through the pipe 127 to the waste heat boiler 1
Led to 22. In the waste heat boiler 122, waste heat recovery for recovering waste heat from high temperature cooling air is performed. At this time, the slag powder collected by gravity collection in the waste heat boiler 122 is stored in the bottles 66 and 67 via the transport path 129. The heat recovered by the waste heat boiler 122 is used in district cooling and heating equipment or the like.

The cooling air after the waste heat recovery is guided to the filter dust collector 70 via the pipe 128, and after collecting the slag powder by the plurality of bag filters, it is guided to the chimney 80 via the suction fan 69 to be exposed to the atmosphere. Is released. The slag powder collected by each bag filter is stored in each of the bins 66 and 67 in the same manner as the embodiment shown in FIGS.

In this way, the cooling air is taken in from the discharge port 32 side of the rotary cooler main body 25, the slag is cooled and sucked and exhausted from the supply port 31 side, so that the cooling air is heated from the low temperature side of the slag to a high temperature. The slag is cooled toward the side, and a large amount of heat is taken from the slag to reach a high temperature. By recovering the waste heat from the high-temperature cooling air by the waste heat boiler 122, the waste heat can be effectively used and energy can be saved.

In the above-described embodiment of the present invention, the rotary coolers 7 and 110 are provided with both the first water cooling means 53 and the second water cooling means 54, but the invention is not limited to this. 1 water cooling means 53 and 2nd water cooling means 5
4 may be provided, or both the first and second water cooling means 53 and 54 may not be provided. With such a configuration, the configuration can be simplified and can be suitably applied to a small-scale plant.

In the above-described embodiment of the present invention, the plurality of lifters 28 are provided at intervals in the axial direction, but instead, they may be provided over the entire length of the stirring air cooling region. With such a configuration, the forced crushing ability of the lifter with respect to the stainless steel slag is improved, and the cooling rate of the stainless steel slag can be increased. Further, if the rotary coolers 7 and 110 are sufficiently long, the plurality of lifters 28 may not be provided.

In the embodiment of the present invention shown in FIG. 12, the plurality of lifters 28 are provided so as to project radially inward by the same length, but instead of this, the discharge port 32 is provided.
The amount of protrusion may be decreased toward the position. With this configuration, the weight of the rotary cooler 110 can be further reduced.

In the embodiment of the present invention, the processing equipment 1 and 120 are provided with the magnetic separator 78 which is a metal collecting means, but they may not be provided.

[0098]

According to the present invention as set forth in claim 1, the stainless steel slag is taken in from the supply port side by the slag cooling means and is cooled from the surface to the slag transformation temperature or lower by the cooling air sucked from the discharge port side. It can be suspended in the air stream by being cooled and pulverized.

The slag powder is sucked by the slag cooling means and collected by the slag powder collecting means, and the slag particles and the slag mass are sieved by the sieving means and collected by the slag particle collecting means and the slag mass collecting means, respectively. ,
It is possible to prevent a large amount of slag powder from being introduced into each through hole of the sieving means, and prevent clogging of the sieving means. According to the present invention, since a plurality of damming blades are provided on the inner peripheral surface of the discharge cylinder side end of the rotary cylinder, the damming and discharging of the slag mass are selectively switched depending on the rotation direction of the rotary cylinder. And the slag mass can be discharged in stainless steel slag processing units. As a result, the slag mass can be efficiently transported.

According to the second aspect of the present invention, since the metal as a valuable metal is recovered from the slag particles by the metal recovery device, the stainless steel slag can be treated without waste.

According to the present invention as set forth in claim 3, since the stainless steel slag is agitated by the lifter means, the cooling of the stainless steel slag is promoted to promote natural pulverization, and at the same time, it is forced by the impact at the time of dropping. It is possible to improve the cooling treatment efficiency of the stainless steel slag and to improve the recovery efficiency of the slag powder and the slag particles by being pulverized and fragmented.

According to the fourth aspect of the present invention, since the cooling air is taken in from the supply port side of the rotary cylinder and is sucked and exhausted from the discharge port side, the cooling air flows along the traveling direction of the slag. The high temperature slag can be effectively cooled by the cooling air, and the slag can be efficiently pulverized.

According to the fifth aspect of the present invention, the cooling air is taken in from the discharge port side of the rotary cylinder, sucked from the supply port side, and the waste heat is recovered by the heat exchanger. A large amount of heat can be taken and energy can be saved by recovering waste heat.

According to the sixth aspect of the present invention, since the inner diameter of the rotary cylinder is reduced from the supply port toward the discharge port, the rotary cylinder is discharged from the supply port. It can be configured so as to correspond to the retained amount of the stainless steel slag that decreases toward the outlet, the configuration can be downsized, and the weight of the rotary cylinder can be reduced. In particular, in the structure of the present invention as set forth in claim 4, the speed of the air sucked by the slag cooling means at the outlet can be made higher than the speed at the inlet so that the slag powder is easily floated and transported. Therefore, the recovery efficiency of slag powder can be improved.

According to the present invention described in claims 7 and 8,
Since the stainless steel slag is directly or indirectly water-cooled by the internal or external water cooling means, the cooling of the stainless steel slag can be enhanced. Further, according to the present invention of claim 8, since the rotary cylinder that is rotationally driven is water-cooled, the slag is indirectly cooled, and local thermal deformation of the rotary cylinder can be prevented, so that the life is extended. Can be achieved.

[0106]

According to the present invention of claim 9, the slag powder collected by the dust collecting means is arbitrarily stored in a plurality of storage means, so that the composition of the slag powder differs depending on the type of stainless steel to be refined. Collection can be performed.

According to the tenth aspect of the present invention, the temperature of the gas sucked by the slag cooling means from the slag classifying means to the slag powder collecting means is predetermined by adjusting the amount of cooling water of the internal water cooling means by the gas temperature adjusting means. Since the temperature is adjusted within the temperature range, it is possible to cope with, for example, the heat resistance of a bag filter and the condensation of gas used as dust collecting means.

According to the eleventh aspect of the present invention, since the stainless steel slag is supplied to the slag classifying means in the molten state, the stainless steel slag is once solidified and then the solidified stainless steel slag is roughly crushed. The step of supplying to the slag classifying means can be omitted. Therefore, the treatment efficiency of the stainless steel slag can be remarkably improved, the area of the slag treatment plant can be reduced, and the space of the treatment equipment can be saved.

[Brief description of drawings]

FIG. 1 is a system diagram showing a configuration of a stainless steel slag treatment facility 1 according to an embodiment of the present invention.

FIG. 2 is a front view showing a simplified configuration of a rotary cooler 7.

FIG. 3 is a vertical sectional view showing a simplified configuration of a rotary cooler 7.

FIG. 4 is a sectional view taken along the section line IV-IV in FIG.

5 is a cross-sectional view taken along the section line VV of FIG.

6 is a side view showing a lower left portion of the rotary cooler 7 as viewed from the discharge port 32 side when the rotary cooler body 25 is rotationally driven in the forward rotation direction A. FIG.

FIG. 7 is a sectional view taken along section line VII-VII in FIG.

FIG. 8 is a side view showing a lower right portion of the rotary cooler 7 as viewed from the discharge port 32 side when the rotary cooler body 25 is rotationally driven in the reverse rotation direction B.

9 is a cross-sectional view taken along the section line IX-IX in FIG.

FIG. 10 is a sectional view showing a simplified configuration around an outlet housing 63.

FIG. 11 is a system diagram showing a configuration of a main part of a stainless steel slag treatment facility 1.

FIG. 12 is a vertical cross-sectional view showing a simplified configuration of a rotary cooler 110 provided in a stainless steel slag treatment facility according to another embodiment of the present invention.

FIG. 13 is a system diagram showing a configuration of a main part of a stainless steel slag treatment facility 120 which is still another embodiment of the present invention.

[Explanation of symbols]

1,120 stainless steel slag treatment equipment 3 slag feeder 7,110 Rotary cooler 8,121 Slag powder recovery means 9 Slag particle recovery equipment 10 Slag lump collection means 21,130 Slag cooling means 25,111 Rotary cooler body 26 rotation drive means 27 Water cooling means 28 Lifters 29 rotary sieve 30 weir blades 31 Supply port 32 outlet 41 spray pipe 42 injection pipe 43 First valve 44 Second valve 45 pumps 46 Cooling water source 53 First water cooling means 54 Second water cooling means 56 through hole 65 Dust collection means 66,67 Slag powder storage bottle 68 Humidifying and kneading machine 69 Suction fan 70 Filter dust collector 70a Bug filter 71 screw conveyor 76 shoots 77 belt conveyor 78 Magnetic Separator 81 hopper 82 counter damper 105 Gas temperature adjusting means 122 Waste heat boiler 123 hot cyclone 124 Cooler for fine powder

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B07B 4/00 B07B 4/00 Z C04B 5/00 C04B 5/00 B C21C 5/28 C21C 5/28 D 5/54 5 / 54 7/00 7/00 J // C22B 7/04 C22B 7/04 A (72) Inventor Hiroki Nomoto 3-1, 1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe factory (56) References JP-A-59-24177 (JP, A) JP-A-61-232251 (JP, A) JP-A-54-37093 (JP, A) JP-A-7-332861 (JP, A) JP-A-52 -17388 (JP, A) JP-A 52-120994 (JP, A) JP-A 54-21988 (JP, A) JP-A 48-73373 (JP, A) JP-A 64-52636 (JP, A) ) Actual Development Sho 59-18300 (JP, U) Actual Development 1-70844 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) C04B 5/00 C04B 5/02 B07B 1/24-15/00 C22B 1/00-61/00

Claims (11)

(57) [Claims] 1. A slag particle having a predetermined particle size range while cooling a high temperature stainless steel slag by sucking cooling air, a slag powder having a particle size smaller than the slag particle, and a particle larger than the slag particle. Slag classification means for classifying into a slag mass having a diameter, slag powder collecting means for collecting slag powder classified by the slag classifying means, and slag particle collecting means for collecting the slag particles classified by the slag classifying means, And a slag lump collecting means for collecting the slag lumps classified by the slag classifying means, wherein the slag classifying means is formed in a substantially cylindrical shape and is rotatably provided around the central axis thereof, and the slag is supplied. A rotary cylinder having a supply port and a discharge port through which classified slag mass is discharged, the vertical cylinder including the central axis and the inner peripheral surface of the rotary cylinder. The lower crossing line of the two crossing lines formed by is inclined downward as it goes from the supply port to the discharge port with respect to the horizontal plane, and the rotary cylindrical body is provided around the central axis line. It is connected to a rotary cylinder through a rotary drive means for rotationally driving and a slag powder collecting means, sucks cooling air into the rotary cylinder to cool the slag, and powders the slag to generate slag powder and cooling air. A slag cooling means for sucking and exhausting to the outside of the rotary cylinder, and a sieve means provided on the discharge port side of the rotary cylinder and having a plurality of through holes formed along the entire circumference in the circumferential direction of the rotary cylinder. And a sieving means that allows the maximum slag particles to pass through.The inner peripheral surface of the end of the rotary cylinder on the outlet side projects radially inwardly at intervals in the circumferential direction. A plurality of damming blades are provided, and each damming blade is The stainless steel is characterized in that it is provided closer to a virtual one plane including the discharge port toward the downstream side in a predetermined one rotation direction of the rotary cylinder and inclined at a predetermined angle with respect to the virtual one plane. Slag processing equipment. 2. The stainless steel slag treatment facility according to claim 1, further comprising a metal collecting means for collecting granular metal from the slag particles. 3. The lifter means is provided closer to the discharge port than the supply port of the rotary cylinder, and includes a lifter means projecting radially inward from the inner peripheral surface of the rotary cylinder.
The described stainless steel slag processing equipment. 4. The slag cooling means takes in cooling air from the supply port side of the rotary cylinder and sucks and exhausts it from the discharge port side of the rotary cylinder. The stainless steel slag treatment facility described in 1. 5. The slag cooling means takes in the cooling air from the outlet side of the rotary cylinder, sucks and exhausts it from the supply port side of the rotary cylinder, and directs the flow of the cooling air with respect to the traveling direction of the slag. And a heat exchanger for recovering waste heat from the cooling air sucked and discharged outside the rotary cylinder, between the slag classifying means and the slag powder collecting means. Claim 1
The stainless steel slag treatment equipment according to any one of 1 to 3. 6. The rotating cylinder body is formed so that its inner diameter is reduced from the supply port toward the discharge port.
Treatment equipment for stainless steel slag described in 1. 7. An internal water cooling unit is further inserted, which is inserted from the supply port of the rotary cylinder, sprays cooling water into the vicinity of the supply port of the rotary cylinder, and directly cools the slag. The stainless steel slag treatment facility according to any one of claims 1 to 6. 8. The rotary cylinder is provided in the vicinity of a supply port,
The stainless steel slag according to any one of claims 1 to 7, further comprising external water cooling means for injecting cooling water to the outer peripheral surface of the rotary cylinder to indirectly cool the slag. Processing equipment. 9. The slag powder collecting means is provided with a dust collecting means for collecting the slag powder, and a plurality of storage means provided below the dust collecting means for storing the collected slag powder according to the type of stainless steel. The treatment facility for stainless steel slag according to any one of claims 1 to 8, further comprising: 10. A gas temperature adjusting means is provided between the slag classifying means and the slag powder collecting means, and the gas temperature adjusting means measures the temperature of the gas sucked into the slag cooling means, 10. The stainless steel slag treatment equipment according to claim 7, wherein the cooling water amount of the internal water cooling means is adjusted so that the temperature of this gas falls within a predetermined temperature range. . 11. The treatment facility for stainless steel slag according to claim 1, wherein the stainless steel slag is supplied to the slag classifying means in a molten state.