JP4017403B2 - Sand making system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sand making system, and relates to a technique for producing sand from waste molten slag made from municipal solid waste incinerated ash, shredder dust, landfills, and other general waste and industrial waste.
[0002]
[Prior art]
Conventionally, waste such as municipal waste incineration ash was finally landfilled, but it was damaged by the destruction of the environment due to the construction of the landfill site and the leaching of harmful substances into the leachate at the landfill site. It is difficult to secure a new landfill site because of concerns about material leakage. For this purpose, waste is melted in a melting furnace to form waste melt slag, thereby reducing the volume of waste and fixing harmful components.
[0003]
In addition, for the purpose of recycling waste molten slag, attempts have been made to crush waste molten slag and use it as an aggregate for civil engineering construction or as a raw material for ceramics. By the way, waste molten slag made from municipal waste incineration ash, shredder dust, industrial waste landfills, and the like contains metal substances such as aluminum, iron, and copper. This metal is present as an impurity when the crushed waste slag is recycled as an aggregate for civil engineering construction or as a raw material for ceramics, but the metal itself is useful, so the metal is removed from the waste molten slag. If separation and recovery can be performed, more effective recycling of waste molten slag can be achieved.
[0004]
Known techniques of this type include those described in, for example, Japanese Patent Laid-Open Nos. 10-156329, 2000-272938, and 2000-202321. For example, in the configuration shown in FIG. 11, the granulated slag 101 that melts the raw material waste and later discharges from the melting furnace is crushed by the slag crusher 102 to form a crushed slag in which metal particles and slag particles are mixed. The metal particles excellent in spreadability such as aluminum are rolled into thin pieces having a predetermined diameter, and the crushed slag is classified by the sieve 103 to separate the thin metal pieces 104 such as aluminum from other crushed slags. The crushed slag after the sieve 103 is magnetically sorted by the magnetic separator 105 to separate and collect the iron metal particles 106 from the crushed slag, and the crushed slag after the magnetic sorting is solid-liquid by the water-slag separator 107. Separated to obtain crushed slag as product sand 108. The recovered separated water is returned to the slag crusher 102 after use by the water treatment facility 109 and used.
[0005]
[Problems to be solved by the invention]
However, waste molten slag includes those that are difficult to be magnetically sorted, such as copper and SUS. When these components are used to recycle crushed waste molten slag as aggregates for civil engineering or as raw materials for ceramics, In addition, it is a factor that degrades quality.
[0006]
The present invention solves the above-mentioned problems, and recovers useful metals from crushed slag of waste molten slag that uses shredder dust, industrial waste, etc. as a raw material, and is suitable for aggregates for civil engineering construction and raw materials for ceramic industry. An object is to provide a sand making system capable of obtaining crushed slag.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the sand making system according to the first aspect of the present invention is configured by crushing waste molten slag containing metal to crush slag in which metal particles and slag particles are mixed, and by rolling treatment. Metal particles with excellent spreadability such as aluminum are formed into thin pieces with a diameter larger than that of slag particles, and the metal of this thin piece is separated and collected by classification with a sieve, and the crushed slag after the sieve is subjected to specific gravity separation treatment In a sandmaking system that separates and collects other metal particles and uses the remaining crushed slag as product sand, a specific gravity separator that performs specific gravity separation rotates around a rotation axis inclined at a predetermined angle with respect to the horizontal. A rotating drum having a cylindrical body having a conical portion, a discharge portion connected to a small-diameter opening formed at the top of the conical portion located on the lower end side of the rotating drum, and a large-diameter opening on the upper end side of the rotating drum. Insert into the tip opening Separation object throwing part facing the top of the cone part, water flow adjusting means arranged between the tip opening of the separation object throwing part and the small diameter opening of the conical part, the rotary drum is separated in the cylinder A spiral groove is provided on the inner peripheral surface for sending an object to the small-diameter opening side in accordance with the rotation around the rotation axis, and the discharge part is a water supply means for supplying separation working water with a predetermined flow rate and a predetermined amount of water into the rotary drum, and discharge The separator discharge means for discharging the separated substance flowing into the section is connected, and the water flow adjusting means expands toward the opening of the tip of the separation object input section and has a predetermined specific gravity and a predetermined density in a casing having water permeability. It is characterized by holding a resistor that has a shape and adjusts the water flow of the separation working water to a predetermined flow velocity.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the waste molten slag of the raw material slag 111 is water-cooled slag or slow-cooled slag derived from industrial waste such as shredder dust and various sludges, water-cooled slag or slow-cooled derived from industrial landfills. Water-cooled slag or slow-cooled slag derived from general waste such as slag, municipal waste, water-cooled slag or slow-cooled slag derived from incineration ash of the above-mentioned general waste, It is at least one of slowly cooled slag, and is used in an appropriate combination.
[0012]
This raw material slag 111 is subjected to crushing and rolling processes many times by a slag crusher 112. In the slag crusher 112, a plurality of movable bodies are housed together with granulated slag and water as a buffer fluid in a body that rotates around a horizontal rotation axis, and approaches and separates from each other as the body rotates. The raw material slag 111 is crushed and rolled between the movable bodies that fit. The raw material slag 111 contains a plurality of kinds of substances therein, and becomes a crushed slag containing metal particles such as glassy slag particles, aluminum, iron, etc. as the crushing progresses. Since the metal particles have spreadability and the vitreous slag particles have brittleness, the pressing force by the movable body crushes the vitreous slag particles and exerts a rolling action on the metal particles.
[0013]
For this reason, metal particles excellent in spreadability such as aluminum become larger in diameter and become flakes, differentiated in particle size from other metal particles such as iron, copper, SUS, etc. Reduce diameter. The crushed slag is classified by a sieve 113, and the flake aluminum 114 is separated and collected from other particles of the crushed slag.
[0014]
The crushed slag after the sieve 113 is separated by a specific gravity separation device 115 to separate and collect other metal particles 116 such as iron, copper, and SUS. The crushed slag of vitreous slag particles remaining after the specific gravity separation is solid-liquid separated in a water-slag separator 117 to produce product sand 118, and the separated water is returned to the slag crusher 112 via the water treatment facility 119 and recycled. .
[0015]
Various devices can be applied as the specific gravity separation device 115. The specific gravity separation device 115 in the present embodiment will be described below.
2 to 10, the specific gravity separation device 115 has a rotating drum 3 that forms a cylinder having a conical portion 2, and the rotating drum 3 is placed on a movable table 4 around a rotation axis via a roller 4 a. Holds freely. The rotary drum 3 has a small-diameter opening 5 at the top of the conical portion 2 located on the lower end side, a large-diameter opening 6 on the upper end side, and a discharge portion 7 connected to the small-diameter opening 5 via a bearing 8. The movable table 4 is provided with a motor 11 that is held by the movable table 4 and that rotationally drives the sprocket 9 provided in the discharge unit 7 via a chain 10. The movable base 4 is pivotally supported by a fixed base 13 through a rotating shaft 12 so as to be swingable, and a rear side part is held up and down by a cylinder device 14 and tilted by driving of the cylinder device 14. The rotary drum 3 is held in a posture inclined at a predetermined angle with respect to the horizontal.
[0016]
As shown in FIG. 3, the rotary drum 3 has a single or multiple spiral groove 15 on the inner peripheral surface 3 a, and the spiral groove 15 is used to rotate separated matter settled in the drum around the rotation axis. Along with this, it is sent out toward the small-diameter opening 5. A plurality of disk-shaped dam plates 16 are arranged in parallel at appropriate intervals along the rotation axis direction inside the rotary drum 3, and as shown in FIG. A predetermined gap is formed between the inner peripheral surface 3a of the rotating drum 3 and a passage for a separated material, and is fixed to the inner peripheral surface 3a of the rotating drum 3 at a plurality of locations on the outer peripheral edge 16a.
[0017]
A diluting water supply pipe 17 serving as means for supplying diluting water is inserted inside the rotating drum 3, and each part of the rotating drum 3 in which the ejection portion 18 communicating with the diluting water supplying tube 17 is partitioned by the weir plate 16. Is arranged. A water spray pipe 19 is inserted in the vicinity of the large-diameter opening 6, and a discharge hopper 3 b is provided outside the large-diameter opening 6 of the rotary drum 3.
[0018]
The separation object throwing portion 20 is inserted into the rotary drum 3 through the large-diameter opening 6 on the upper end side, and the tip opening 21 is opposed to the top of the conical portion 2 and is concentric with the axis of the rotary drum 3 or It arrange | positions in the attitude | position which inclines to the predetermined angle larger than the axial center of the rotating drum 3. As shown in FIG. 8, the separation object throwing unit 20 has a structure in which the chute 22 has a structure in which the cross section of the channel increases from the lower part toward the upper part in a cross-sectional shape orthogonal to the internal channel. A hopper portion 23 is provided on the upper end side of 22. The cross-sectional shape of the chute 22 is not limited to the present embodiment, and there are various shapes such as a perfect circle and an ellipse.
[0019]
Between the tip opening 21 of the separation object throwing portion 20 and the small diameter opening 5 of the conical portion 2, as a water flow adjusting means, a net or the like that expands toward the tip opening 21 of the separation subject throwing portion 20 opens A casing 24 having water permeability is arranged, and a resistor 25 having a plurality of fluidities having a predetermined specific gravity and a predetermined shape is held inside the casing 24. The resistor 25 is a sphere, a polygon, a lattice, or the like. There are various things.
[0020]
The discharge part 7 has a double pipe structure of an inner pipe 26 and an outer pipe 27, and water supply pipes 28 and 29, which are means for supplying separate working water to the inner pipe 26 and the outer pipe 27, respectively, are provided with valves 30, 31. Connected through. The water supply pipes 28 and 29 supply separation working water having a predetermined flow rate and a predetermined amount of water to the inside of the rotary drum 3. The outer tube 27 is connected to the rotary drum 3 via a rotary joint 27a, and a transparent tube 27b is disposed in the middle. The discharge part 7 is not limited to a double-pipe structure, but may be a single-pipe structure. The outer tube 27 is connected to a separated product discharge pipe 32 serving as a means for discharging the separated product via a first valve 33 a, and a second valve 33 b is provided on the lower end side of the separated product discharge pipe 32. In the separated product discharge pipe 32, a reservoir 32a is formed between the first valve 33a and the second valve 33b, and a water supply pipe 34 is connected to the reservoir 32a via a third valve 33c.
[0021]
In the above-described configuration, during operation, the rotary drum 3 is rotationally driven around the rotation axis through the chain 10 and the sprocket 9 by driving by the motor 11. The valves 30 and 31 are opened to an appropriate opening degree, and the separation working water is supplied from the water supply pipes 28 and 29. The separation working water in the water supply pipe 28 flows directly into the rotary drum 3 through the inner pipe 26, and the separation working water in the water supply pipe 29 flows into the rotary drum 3 through the outer pipe 27 against the separated matter described later. The small diameter opening 5 of the conical portion 2 is combined and ejected toward the casing 24.
[0022]
The crushed slag after the sieve 113, which is the separation target, is supplied to the chute 22 from the hopper 23 of the separation target input unit 20 together with the conveyance water.
As shown in FIG. 8, in the chute 22, the flow rate of the transport water becomes slower with frictional resistance as it is closer to the inner surface of the chute 22, and is closer to the center side of the channel farther from the inner surface and the upper side where the channel cross-sectional area is larger. Since there is a speed gradient that increases, glassy crushed slag (product sand) 118 having a smaller specific gravity is more influenced by the urging force of the water flow and flows upward, and a metal component crushed slag 116 having a higher specific gravity is attached to the water flow. The influence of the power is small and flows downward and flows, and the separation object is roughly separated vertically in the chute portion 22.
[0023]
As shown in FIG. 9, the glassy crushed slag (product sand) 118 and the metal component crushed slag 116 that have flowed into the casing 24 of the cone portion 2 from the chute 22 are received by the resistor 25 and the casing 24, The speed along the axial direction of 22 disappears, and the whole is lifted upward by the urging force of the water flow of the separation working water. At this time, the glassy crushing slag (product sand) 118 having a small specific gravity is lifted upward by the water flow of the separation working water adjusted to a predetermined flow rate by the control of the valves 30 and 31 and the presence of the resistor 25, and the specific gravity is increased. Large metallic component slag 116 settles and separates. The separated metal component crushing slag 116 having a large specific gravity passes through the mesh of the casing 24 and settles on the inner peripheral surface of the rotary drum 3, and the spiral groove 15 turns around the rotation axis as the rotary drum 3 rotates. By this, it is conveyed toward the small diameter opening 5 and flows into the discharge portion 7 from the small diameter opening 5.
[0024]
The separation water flows from the small-diameter opening 5 to the large-diameter opening 6 of the conical portion 2, and is slowed down by the frictional resistance as it is closer to the inner peripheral surface of the rotating drum 3, and becomes faster toward the upper side far from the inner peripheral surface. There is a gradient. For this reason, the glassy crushing slag (product sand) 118 and the metal component crushing slag 116, which are separation objects that move on the flow of separation action water, are a glassy crushing slag (product sand) 118 having a small specific gravity. As the slag 116 of the metal component having a larger specific gravity is affected by the urging force of the water flow, the slag 116 having a larger specific gravity is less affected by the urging force of the water flow and settles earlier, and is blocked by the dam plate 16 having a predetermined height. Settling.
[0025]
The crushing slag 116 of the metal component having a large specific gravity that has settled is conveyed toward the small-diameter opening 5 by the spiral groove 15 turning around the rotation axis along with the rotation of the rotary drum 3, and is transferred from the small-diameter opening 5 to the discharge unit 7. Inflow. A glassy crushed slag (product sand) 118 having a small specific gravity is conveyed by the separation action water and flows out from the large-diameter opening 6 to the discharge hopper 3b. The small-specific gravity vitreous slag (product sand) 118 that has settled before reaching the large-diameter opening 6 is lifted upward along with the rotation of the rotary drum 3, and again rides on the flow of separation action water to cause the large-diameter opening 6 to flow. Move towards Even if the crushing slag 116 of a metal component having a large specific gravity is lifted upward with the rotation of the rotating drum 3, the crushing slag 116 does not exceed the weir plate 16.
[0026]
The diluting water supplied through the diluting water supply pipe 17 flows into the respective regions partitioned by the dam plate 16 from the ejection part 18, dilutes the concentration of the separation object in the separation working water in each partition region, and flows the separation object. To improve the separation performance. Further, the water spray from the water spray pipe 19 dilutes the concentration of the separation object in the separation action water in the vicinity of the large-diameter opening 6 to enhance the fluidity of the separation object and increase the separation performance.
[0027]
As shown in FIG. 10, in the discharge section 7, a material having a large specific gravity with respect to the flow velocity of the separation working water flowing through the outer pipe 27 flows down against the flow, and a member having a small specific gravity is lifted by the separation working water. By returning to the conical part 2 from the discharge part 7, the separation accuracy is improved.
[0028]
The separated discharge pipe 32 normally has the first valve 33a opened and the second valve 33b and the third valve 33c closed, and a large specific gravity flowing down from the rotary drum 3 to the outer pipe 27 is separated. It flows down to the discharge pipe 32 and stays in the storage part 32a. When discharging the separated matter, the valve 31 is operated to increase the flow rate and flow velocity of the separation working water supplied from the water supply pipe 29 to the outer pipe 27 to prevent the separated matter from flowing into the discharge portion 7 from the rotary drum 3. The first valve 33a is closed, the second valve 33b is opened, and the separated matter staying in the storage portion 32a is discharged. Thereafter, the second valve 33b is closed, the third valve 33c is opened, and the reservoir 32a is filled with water from the water supply pipe 34. Then, the third valve 33c is closed, the first valve 33a is opened, and the valve 31 is operated to return the flow rate and flow velocity of the separation working water supplied from the water supply pipe 29 to the outer pipe 27 to the normal state.
[0029]
【The invention's effect】
As described above, according to the present invention, the diameter of aluminum is increased by its extensibility and differentiated in particle diameter from other metal particles such as iron, copper, SUS, etc., and the vitreous slag particles are reduced in diameter by their weakness. It becomes possible to remove aluminum with a sieve. The specific gravity of the vitreous slag particles reduced in diameter among the crushed slag remaining after the removal of aluminum is the smallest, so the vitreous slag particles and metal particles such as iron, copper, and SUS are separated by the difference in specific gravity. This makes it possible to produce high-quality sand from waste molten slag.
[Brief description of the drawings]
FIG. 1 is a flow sheet diagram showing a sand making system in an embodiment of the present invention.
FIG. 2 is an overall cross-sectional view showing a specific gravity separator in the sand making system.
FIG. 3 is an enlarged view of a main part of the specific gravity separator.
FIG. 4 is a side view of the specific gravity separator.
FIG. 5 is an enlarged view of a main part of the specific gravity separator.
6 is a cross-sectional view taken along the line AA in FIG. 2;
7 is a cross-sectional view taken along the line BB in FIG.
FIG. 8 is a cross-sectional view of a chute portion.
FIG. 9 is an explanatory view showing the operation of the specific gravity separator.
FIG. 10 is an explanatory view showing the operation of the specific gravity separator.
FIG. 11 is a flow sheet diagram showing a conventional sand making system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Specific gravity separation apparatus 2 Conical part 3 Rotating trunk | drum 3a Inner peripheral surface 3b Discharge hopper 4 Movable base 4a Roller 5 Small diameter opening 6 Large diameter opening 7 Discharge part 8 Bearing 9 Sprocket 10 Chain 11 Motor 12 Rotating shaft 13 Fixed base 14 Cylinder apparatus 15 Spiral groove 16 Dam plate 16a Outer peripheral edge 17 Diluted water supply pipe 18 Spouting part 19 Sprinkling pipe 20 Separation target input part 21 Tip opening 22 Chute part 23 Hopper part 24 Casing 25 Resistor 26 Inner pipe 27 Outer pipe 27a Rotary joint 27b Transparent Pipes 28 and 29 Water supply pipes 30 and 31 Valve 32 Separator discharge pipe 32a Storage part 33a First valve 33b Second valve 33c Third valve 34 Water supply pipe 111 Raw material slag 112 Slag crusher 113 Sieve 114 Aluminum crushing slag 115 Specific gravity separator 116 Metal component crushing slag 117 Water-slag Away machine 118 product sand 119 water treatment facilities

Claims (1)

Crushing waste molten slag containing metal to form crushed slag in which metal particles and slag particles are mixed, and forming metal particles with excellent extensibility such as aluminum into thin pieces with a larger diameter than slag particles by rolling treatment Then, the metal of the flakes is separated and collected by classification with a sieve, and the crushed slag after the sieve is separated and collected by separating the other metal particles, and the remaining crushed slag is used as product sand. In the system,
A specific gravity separation device that performs a specific gravity separation process rotates around a rotation axis inclined at a predetermined angle with respect to the horizontal, and forms a cylindrical body having a conical portion, and a conical portion positioned on a lower end side of the rotary drum. A discharge part connected to a small-diameter opening formed at the top, a separation object inserting part inserted into the rotary cylinder from a large-diameter opening on the upper end side of the rotary cylinder, and a tip opening facing the top of the conical part, and a separation object A water flow adjusting means disposed between the leading end opening of the charging portion and the small diameter opening of the conical portion;
The rotary drum has a spiral groove on the inner peripheral surface that feeds the sediment settled in the drum to the small-diameter opening side with the rotation around the rotation axis, and the discharge part separates the rotary drum into the rotary drum with a predetermined flow rate and a predetermined amount of water. A water supply means for supplying water and a separator discharge means for discharging the separated substance flowing into the discharge section are connected, and the water flow adjusting means has a water permeability that expands and opens toward the tip opening of the separation object input section. A sand making system comprising: a casing having a specific gravity and a predetermined shape, and a resistor that adjusts the flow of the separation working water to a predetermined flow velocity.

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