JP2005125133A - Wet treatment apparatus of waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily separate metal pieces from slurry. <P>SOLUTION: Waste A is charged into a wet mill 15 together with water and crushed to form slurry S, and the slurry is used as a part of a raw material to be baked to form cement clinker. A recessed part 16a is provided on the downstream side of the wet mill 15, and a weir 16c over which the slurry flows is provided at an edge part on the downstream side of the recessed part 16a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a waste treatment apparatus for sending waste containing organic matter such as oil, metal waste and the like through a transport pipe so as to be part of a raw material of cement clinker.

  Most of the general waste and industrial waste are landfilled at the final disposal site, or landfilled at the final disposal site after incineration.

  And, for example, it occurs in oil-mixed soil such as the site of an oil refinery factory, soil contaminated with organic matter such as trichlorethylene used for cleaning, soil containing metal scrap such as iron scrap, and sewage treatment plants Dioxins around sludge, incineration ash containing dioxins, debris, brick scrap, concrete blocks, facility interior materials, etc. generated from the demolition of facilities that generate dioxins such as waste incineration facilities Organic chlorine-based wastes such as soil contaminated with lime and plastic molded articles that may cause dioxins by combustion have been disposed of in the same manner.

  However, in recent years, regarding incineration plants and final disposal sites, due to the strict consideration of the environment, it has become difficult to secure new incineration plants and final disposal sites. Yes.

  Therefore, it is a socially important issue to recycle the waste without adversely affecting the environment.

  For this reason, methods of effectively utilizing the waste as part of the raw material for firing cement clinker (part of the cement raw material) have been promoted.

  In this case, the waste is directly supplied to the raw material crushing and drying process in the cement manufacturing facility, and is pulverized while being heated and dried by the exhaust gas introduced from the rotary kiln for cement clinker firing. It was processed by the supplied dry processing method.

  However, the dry processing method has problems such as the possibility that organic substances may volatilize before being introduced into a preheater or the like, and that dust is likely to fly.

  For this reason, a wet processing method has been developed in which a liquid such as water is added to waste and pulverized with a wet mill to form a slurry, which is then charged into the preheater or rotary kiln.

  By the way, in the above-described wet processing method of waste, since slurry is sent to a preheater, a rotary kiln, etc. through a transport pipe, if a relatively large substance remains, the transport pipe may be clogged, and the slurry is transported. Not preferable.

  However, metal scrap such as iron scrap contained in the waste is excellent in spreadability, and therefore remains as a metal piece of a certain size even after being pulverized by a wet mill and becomes a cause of clogging in the transport pipe. In addition, after the slurry is formed by a wet mill, there is a problem that only the metal pieces cannot be easily separated as in the case of sieving used in a drying method.

  This invention is made | formed in view of the said situation, and it aims at providing the wet processing apparatus of the waste which can isolate | separate a metal piece from a slurry easily.

  The waste processing apparatus according to the first aspect of the present invention is a raw material for firing cement clinker by feeding waste into a wet mill together with water and pulverizing the slurry, and sending the slurry through a transport pipe. A waste treatment apparatus as a part of the invention is characterized in that a recess is provided on the downstream side of the wet mill, and a weir that flows beyond the slurry is provided on the downstream edge of the recess. .

  Here, the waste includes, for example, soil containing oil such as gasoline, lubricating oil, hydraulic oil, and machine oil, soil containing trichlorethylene as a cleaning agent, soil containing metal scraps such as iron, Sewage sludge generated at sewage treatment plants, waste incineration ash containing dioxins, debris, bricks, concrete blocks, facility interior materials, etc. generated by dismantling facilities that generate dioxins such as waste incineration facilities Organic chlorine waste such as soil contaminated with dioxins around garbage incineration facilities, plastic molded products that may generate dioxins by combustion, and others are raised.

  According to a second aspect of the present invention, there is provided a waste treatment apparatus according to the first aspect of the present invention, wherein the first opening and closing member is installed to form the bottom of the recess, and the first opening and closing member is provided. And a second opening / closing member that is disposed to constitute the second bottom of the recess when the first opening / closing member is open.

  According to a third aspect of the present invention, there is provided a waste processing apparatus according to the first or second aspect of the present invention, wherein the waste input pipe for supplying the waste into the wet mill is connected to the inner surface of the waste input pipe. In order to generate a water flow along the nozzle, a nozzle for ejecting the water is provided.

  According to a fourth aspect of the present invention, there is provided a wet processing apparatus for waste according to any one of the first to third aspects, wherein the wet mill rotates about an axis to pulverize the waste. The slurry is agitated with the water to form a slurry. The wet mill has an inflow port that flows out from the outflow port of the waste input pipe by rotating around the axial center together with the wet mill. It is characterized in that there are provided conveying blades for feeding waste and water into the wet mill.

  According to invention of Claims 1-4, while being able to grind | pulverize wastes, such as soil and concrete finely in a wet mill, the said grinded waste and water can be knead | mixed, thereby A slurry can be obtained. On the other hand, metal scrap such as iron scrap is excellent in spreadability, so it can be divided to some extent by, for example, balls and other waste provided in the wet mill, but constitutes a slurry It cannot be pulverized as finely as possible.

  That is, the metal scrap is struck by the ball or the like and becomes a flat metal piece of a certain size, so that it flows out from the wet mill together with the slurry, and when sent as it is to the transport pipe There is a risk of clogging in the transport pipe.

  However, a recess is provided on the downstream side of the wet mill, and a weir that flows over the slurry on the downstream edge of the recess is provided, so while the slurry flows downstream from the wet mill, It can be prevented that the metal piece settles in the recess and moves further downstream than the weir. That is, since the metal piece has a large specific gravity with respect to the slurry, it naturally settles and accumulates in the recess.

  Therefore, metal pieces can be easily separated from the slurry while maintaining a steady flow of the slurry flowing out from the wet mill.

  According to the invention of claim 2, since the first opening / closing member constituting the bottom of the concave portion and the second opening / closing member constituting the second bottom of the concave portion located further downward are provided, the first opening / closing member is provided. By opening the opening and closing member, the metal piece deposited on the first opening and closing member can be moved onto the second opening and closing member, and after closing the first opening and closing member, the second opening and closing member is opened. Thus, the metal piece can be taken out from the recess while preventing the slurry from flowing out from the recess.

  Therefore, the metal piece separated by the recess can be discharged out of the line through which the slurry flows while maintaining a steady flow of the slurry.

  According to the invention of claim 3, by ejecting water from the nozzle, an appropriate amount of water can be added to the waste before being put into the wet mill, and the water flowing out from the nozzle is sent to the waste input pipe. Therefore, it is possible to prevent soil in the waste from gradually adhering to the inner surface of the waste input pipe, and finally blocking the waste input pipe. .

  That is, when water is simply added to the waste, a part with increased viscosity is generated in a part of the soil or the like in the waste, and the part with increased viscosity adheres to the inner surface of the waste input pipe one after another. The waste input pipe may be blocked. However, since the water flowing out from the nozzle flows along the inner surface of the waste input pipe, it is possible to prevent soil and the like from adhering to the inner surface of the waste input pipe.

  Therefore, the waste input pipe can be reliably prevented from being blocked.

  According to the invention of claim 4, since the conveying blade is provided at the inlet of the wet mill, the waste to which water is added in the waste input pipe can be smoothly drawn into the wet mill. That is, even when the viscosity of soil or the like in the waste differs depending on the amount of water added to the waste, the waste can be forcibly carried into the wet mill at a constant speed.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 100 denotes a waste wet processing apparatus shown as an embodiment of the present invention, and the waste wet processing apparatus 100 is installed in a cement manufacturing facility.

  The cement manufacturing facility mainly includes a dry mill 1, a raw material silo 2, a preheater 3, a rotary kiln 5, a cooler 7, and an electric dust collector 10. Moreover, in FIG. 1, 21 has shown the raw material supply flow path, and 31 has shown the waste gas flow path.

  A cement raw material (limestone, clay, silica, iron raw material, etc.) G is supplied to a dry mill 1 as a raw material pulverization drying process through a dryer as necessary. These cement raw materials G are dried and pulverized under the exhaust gas supplied from the rotary kiln 5 in the dry mill 1 and introduced into the raw material silo 2, and then supplied to the preheater 3 through the raw material supply passage 21. After being preheated by the preheater 3, it is put into a rotary kiln 5 for firing cement and fired to become a cement clinker, and then cooled by a cooler 7.

  In addition, the process from the preheating process part by the preheater 3 to the cooling process part by the cooler 7 through the cement clinker firing process part by the rotary kiln 5 is defined as a cement firing process part.

  The dry mill 1 grinds the cement raw material G while drying the cement raw material G using the heat of the exhaust gas of the rotary kiln 5 supplied via the preheater 3 and the exhaust gas passage 31. The electrostatic precipitator 10 is installed to purify the exhaust gas used for drying the cement raw material G before releasing it to the atmosphere.

  The preheater 3 is composed of a multi-stage cyclone type in which a plurality of cyclones 3a, 3b, 3c, and 3d are connected in multiple stages from the bottom to the top, and the crushed cement raw material G is used as exhaust gas from the rotary kiln 5. And it preheats to predetermined temperature (900 degreeC or more).

  As shown in FIGS. 1 and 3, the rotary kiln 5 has a horizontal cylindrical kiln shell inclined slightly downward toward the downstream side. While rotating the kiln shell around its axis, heavy oil or fine coal is supplied. By heating with the burner 6 as fuel, the cement raw material G supplied from the lowermost cyclone 3a through the flow path 3e and the kiln bottom part 5B is heated to a temperature of 1450 ° C. or more to cause a firing reaction, Cement clinker is generated.

  The cement clinker fired by the rotary kiln 5 is sent to the cooler 7 from the kiln front part 5A provided on the downstream side of the rotary kiln 5, cooled by the cooler 7, and then sent to the finishing process.

  The above is the main configuration in a normal cement manufacturing facility.

  On the other hand, as shown in FIG. 2, the waste wet processing apparatus 100 includes a waste hopper 11 that stores the waste A, and a weighing belt conveyor that measures and conveys the waste A supplied from the waste hopper 11. 12, a waste chute (waste input pipe) 13 installed at the downstream end of the weighing belt conveyor 12 in the conveying direction, a nozzle 14 for supplying water into the waste chute 13, a waste The wet mill 15 which receives the waste A to which water is added in the chute 13 and pulverizes it to make the slurry S (see FIG. 9), and the metal piece M (see FIG. 9) from the slurry S discharged from the wet mill 15 are separated. Metal piece separator 16, slurry tank 17 that stores slurry S flowing out from metal piece separator 16, and slurry S is sucked from slurry tank 17 at a predetermined pressure. A slurry pump 18 to be discharged and a transfer pipe 18a for sending the slurry S discharged from the slurry pump 18 to the kiln bottom part 5B (see FIG. 3) in the cement firing process part as a part of the cement raw material (cement clinker raw material). ing.

  The waste A having a particle size of 100 mm or less is thrown into the waste hopper 11. That is, the waste A having a particle size exceeding 100 mm is crushed to a particle size of 100 mm or less by using, for example, a roll crusher as a crushing means, and then introduced into the waste hopper 11.

  Waste A includes soil containing oil such as gasoline, lubricating oil, hydraulic oil, and machine oil, soil containing trichlorethylene as a cleaning agent, soil containing metal scrap such as iron scrap, Sewage sludge generated at sewage treatment plants, waste incineration ash containing dioxins, debris, bricks, concrete blocks, facility interior materials, etc. generated by dismantling facilities that generate dioxins such as waste incineration facilities Soil contaminated with dioxins around garbage incineration facilities, organochlorine wastes that can cause dioxins by combustion, and other things.

  Dioxins refer to 2,3,7,8-tetrachlorodibenzo-p-dioxin and its related compounds, and polychlorodibenzo-p- with 1-8 chlorine atoms substituted on the dibenzo-p-dioxin nucleus. It includes dioxins (PCDDs) and polychlorodibenzofurans (PCDFs) in which 1 to 8 chlorine atoms are substituted in the dibenzofuran nucleus. These dioxins can be decomposed by staying in a high temperature atmosphere of 800 ° C. or higher for 2 seconds or longer.

  As shown in FIG. 4, the waste chute 13 is formed in a cylindrical shape that is slightly tapered in the downward direction, and receives a waste A supplied from the weighing belt conveyor 12. It is formed in a cylindrical shape whose diameter is slightly tapered downward from the lower end of the hopper portion 13a, and it extends obliquely downward from the lower end portion of the water adding cylinder portion 13b. And the lower end part is integrally formed by the inclination cylinder part 13c inserted in the inflow port part 15d of the wet mill 15. FIG.

  As shown in FIG. 5, the hydration cylinder portion 13 b has an elliptical cross section.

  As shown in FIGS. 4 and 5, the nozzle 14 is an upper end portion of the water addition tube portion 13 b, and the first nozzle portion 14 a and the second nozzle portion arranged at one end portion in the major axis direction in the elliptical cross section. The nozzle part 14b and the 3rd nozzle part 14c are provided, and in order to produce the flow of the water along the whole area of the circumferential direction in the internal peripheral surface of the water addition cylinder part 13b, the water supplied via a pump is ejected from the tank which is not shown in figure It is like that.

  The first nozzle portion 14a is installed so as to extend on a long-diameter line of the cross section of the hydration cylinder portion 13b in a plan view, and is installed in a state where a tip portion with a jet port is steeply inclined downward. In addition, water is dispersed and ejected into the inner peripheral surface of one end portion in the major axis direction of the water addition cylinder portion 13b and the water addition cylinder portion 13b.

  The 2nd nozzle part 14b and the 3rd nozzle part 14c are located in the both sides of the horizontal direction of the 1st nozzle part 14a, and are along the part with a big curvature radius located in the both sides of the minor axis direction of the cross section in the water addition cylinder part 13b. In addition to being installed to extend, the tip with the spout is installed so as to be inclined slightly downward with respect to the horizontal direction. Water is dispersed in the water tube portion 13b and ejected.

  Further, the water ejected from the second nozzle portion 14b and the third nozzle portion 14c flows to the other end side in the major axis direction along the inner peripheral surface of the portion having a large curvature radius, and merges at the other end portion. Will do.

  For this reason, the water which flows out from each nozzle part 14a, 14b, 14c produces the flow of the water along the whole area of the circumferential direction in the internal peripheral surface of the water addition cylinder part 13b.

  In FIG. 5, 14d is a water supply header for receiving the supply of water from the pump and distributing the water to the nozzle portions 14a, 14b, 14c, and 14e is the nozzle portions 14a, 14b, 14c. It is a flow control valve which adjusts the flow of the water which flows out from each of these.

  As shown in FIG. 2, the wet mill 15 has an outer cylinder 15a formed in a cylindrical shape, and rotates around the axis while holding the axis of the outer cylinder 15a in the horizontal direction. The waste A is pulverized and kneaded with water to form a slurry S. In addition, a plurality of balls (not shown) formed of, for example, steel balls are placed in the wet mill 15 so as to promote the pulverization of the waste A. One or more balls are used according to the type and shape of the waste A among three types of balls having a diameter of 50 to 70 mm, 30 to 50 mm, and 20 to 30 mm. A ball having a diameter of 10 to 20 mm may be used depending on the type and shape of the waste A to be input. That is, you may make it use 1 or more types among 4 types of 50-70 mm, 30-50 mm, 20-30 mm, and 10-20 mm.

  Further, closing plates 15b and 15c are provided at respective end portions in the axial direction of the outer cylinder 15a. As shown in FIG. 6, one closing plate 15b is provided at the axial center of one closing plate 15b. A cylindrical inflow port portion 15d penetrating in the axial direction is provided.

  The inflow port portion 15d is a tapered portion 15e whose one end side is gradually reduced in diameter toward the one end from the axial center portion, and the other end side is a straight portion 15f formed in a straight cylindrical shape. ing.

  The lower end portion of the inclined cylinder portion 13c in the waste chute 13 is inserted into the tip portion of the taper portion 15e. Further, a cylindrical portion 13d that is coaxial with the inflow port portion 15d is provided at the lower end portion of the inclined cylindrical portion 13c, and the cylindrical portion 13d and the tapered portion 15e are sealed by the seal member 15g. ing.

  As shown in FIGS. 6 and 7, on the inner surface of the inflow port portion 15 d, a conveyance blade 15 h is provided at each position divided into four equal parts in the circumferential direction. The conveyance blade 15h is configured to rotate together with the inlet 15d with the rotation of the wet mill 15, and to send the waste A and water flowing out from the outlet at the lower end of the inclined cylinder portion 13c into the wet mill 15. Has been.

  Further, as shown in FIG. 8, a cylindrical outlet 15i is provided at the axial center of the other closing plate 15c in the wet mill 15 so as to penetrate the other closing plate 15c in the axial direction. Yes.

  As shown in FIGS. 8 and 9, the metal piece separator 16 is configured to separate the metal piece M from the slurry S flowing out from the outlet portion 15 i.

  That is, metal scraps such as iron scraps are excellent in spreadability, so that they are divided to some extent by the balls in the wet mill 15 and other waste A, but are finely pulverized to constitute the slurry S. It will not be done. However, since the metal scrap is struck by the ball or the like and becomes a flat metal piece M having a certain size, it flows out to the metal piece separator 16 together with the slurry S without staying in the wet mill 15. .

  The metal piece separator 16 is formed in a rectangular container shape, and a hopper portion 16b is provided on the bottom of the metal piece separator 16 so as to form a concave portion 16a whose diameter is tapered downward. And the weir 16c which the slurry S flows upwards is provided in the edge part of the downstream of the recessed part 16a. This weir 16c is comprised by the upper edge part of the downstream of the hopper part 16b.

  A first damper device 16d having a first opening / closing door (first opening / closing member) (not shown) installed to form the bottom of the recess 16a at the lower end of the hopper portion 16b, and the first opening / closing door. And a second damper device 16e having a second opening / closing door (second opening / closing member) (not shown) installed to form the second bottom of the recess 16a. The first damper device 16d and the second damper device 16e are integrally connected vertically.

  Further, a downstream portion of the metal piece separator 16 from the weir 16 c is an outlet portion 16 f that extends downward, and this outlet portion 16 f is connected to a chute 17 a that supplies the slurry S to the slurry tank 17. It has become so.

  In FIG. 2, 18b and 18c are stop valves.

  Next, a waste wet processing method using the waste wet processing apparatus 100 configured as described above will be described.

  As waste A, waste (high-viscosity soil) A contaminated with, for example, oil after being pulverized to a particle size of 100 mm or less and mixed with metal scraps of about 20% iron scrap is put into the waste hopper 11 Then, an optimum amount of waste A that can be pulverized by the wet mill 15 is carried out from the waste hopper 11 by the weighing belt conveyor 12 and supplied to the wet mill 15 through the waste chute 13.

  Further, from the nozzle 14, the amount of water for obtaining the slurry S having a moisture content of 40 to 80% by the wet mill 15 is supplied to the waste A.

  As described above, 40-80% is set, when less than 40%, the viscosity of the slurry S in the wet mill 15 becomes high, the slurry S rotates together with the wet mill 15, This is because the slurry S cannot be discharged from the wet mill 15. If it exceeds 80%, the pulverization efficiency of the waste A is extremely lowered, and the moisture adversely affects the firing of the cement clinker. It is.

  It should be noted that the water content of the slurry S is set to 45 to 65% in order to enhance the dischargeability from the wet mill 15 and to keep the pulverization efficiency of the waste A high and prevent the cement clinker from being adversely affected. More preferably, the amount of water supplied from the nozzle 14 is adjusted.

  In the wet mill 15, the particle size of the contaminated soil in the waste A corresponds to a residue of 90 μm and a residue of 10% or less (the amount remaining on a sieve having an opening of 90 μm is 10% or less), and the viscosity of the slurry S is Waste A is pulverized so as to be 3000 poise or less.

The reason why the particle size of the contaminated soil is 90% or less 10% or less is to make it the same as the particle size of the cement raw material G after being pulverized by the dry mill 1 described above.
The reason why the viscosity of the slurry S is 3000 poises or less is that the maximum allowable viscosity for pumping by the slurry pump 18 is 3000 poises, and it is preferable to set the viscosity to 3000 poises or less.

  And, the slurry S having a particle size of 90 μm residue 10% or less and a viscosity of 3000 poise or less uses a mixture of the above-described three types of 50 to 70 mm, 30 to 50 mm, and 20 to 30 mm. When the speed at which the waste A is supplied to the wet mill 15 is 1.5 to 3.6 t / h (tons / hour), the waste A is obtained by being retained in the wet mill 15 for 30 to 60 minutes.

  According to the waste wet processing apparatus 100 and the waste wet processing method configured as described above, the waste A containing soil, concrete, metal scraps and the like is finely pulverized in the wet mill 15, By kneading with water, for example, as described above, a slurry S having a particle size of 90 μm residue 10% or less and a viscosity of 3000 poise or less can be obtained. On the other hand, since metal scraps such as iron scraps are excellent in spreadability, they are divided to some extent by balls but are not pulverized as finely as slurry S is mixed.

  That is, since the metal scrap becomes a flat metal piece M having a certain size and remains in the slurry S, there is a possibility of clogging in the transport pipe 18a.

  However, since the metal piece separator 16 is provided on the downstream side of the wet mill 15, as shown in FIG. 9, the slurry S is mixed in the slurry S while the slurry S flows downstream in the metal piece separator 16. It is possible to prevent the metal piece M from sinking in the recess 16a and flowing further downstream beyond the weir 16c.

Thereby, the metal piece M can be integrated | stacked in the recessed part 16a.
Therefore, the metal piece M can be easily separated from the slurry S while maintaining a steady flow of the slurry S flowing out from the wet mill 15.

  Further, by opening the first opening / closing door in the first damper device 16d, the metal piece M deposited on the first opening / closing door can be moved onto the second opening / closing door in the second damper device 16e. The metal piece M can be taken out while preventing the outflow of the slurry S from the recess 16a by opening the second door after closing the first door.

  Therefore, the metal piece M separated by the recess 16a can be discharged out of the line through which the slurry S flows while maintaining a steady flow of the slurry S.

  Moreover, since the water which flows out from the nozzle 14 flows along the whole area of the circumferential direction of the inner surface of the water addition part 13b in the waste chute 13, the soil etc. in the waste A adhere to the inner surface of the water supply part 13b. Can be prevented. Therefore, the waste chute 13 can be reliably prevented from being blocked by the waste A.

  Furthermore, since the conveying blade 15 h is provided at the inlet portion 15 d of the wet mill 15, the waste A and water supplied from the waste chute 13 can be smoothly drawn into the wet mill 15. That is, even when the viscosity of the soil or the like in the waste A varies depending on the amount of water added to the waste A, the waste A can be forcibly carried into the wet mill 15 at a constant speed.

  Moreover, about the hazardous | toxic substance of the dioxin contained in the waste A and another organic substance, since it can maintain in the state of 800 degreeC or more for 2 second or less by supplying to the kiln bottom part 5B used as 1000 degreeC or more, It can be reliably broken down into harmless ones.

  In the above-described embodiment, the example in which the slurry S is supplied to the kiln bottom part 5B has been shown. However, the slurry S is the lowermost cyclone 3a and the cement between the cyclone 3a and the kiln bottom part 5B. The raw material G flow path 3e, the exhaust gas flow path 3f between the kiln bottom 5B and the cyclone 3a, or a calcining furnace (not shown) provided with a burner separately, or before the kiln located downstream of the rotary kiln 5 You may throw in in the said rotary kiln 5 from the part 5A.

  These slurry S are charged at a high temperature of 850 ° C. or higher, and the hazardous substances such as dioxins contained in the waste A can be maintained at 800 ° C. or higher for 2 seconds or more. It can be decomposed and rendered harmless.

It is a schematic block diagram which shows the cement manufacturing equipment which installed the wet processing apparatus of the waste shown as one embodiment of this invention. It is a schematic block diagram which shows the wet processing apparatus of the waste. It is a schematic block diagram which shows a part of wet processing apparatus of the waste, and a part of cement manufacturing equipment. It is a front view which shows the waste chute and nozzle in the wet processing apparatus of the waste. It is a figure which shows the waste chute and nozzle in the wet processing apparatus of the waste, Comprising: It is sectional drawing which follows the VV line | wire of FIG. It is sectional drawing which shows the inflow port part of the wet mill in the wet processing apparatus of the waste. It is a figure which shows the inflow port part of the wet mill in the wet processing apparatus of the waste, Comprising: It is sectional drawing which follows the VII-VII line of FIG. It is a front view which shows the metal piece separator in the wet processing apparatus of the waste. It is principal part cross-sectional explanatory drawing which shows the metal piece separator in the wet processing apparatus of the waste.

Explanation of symbols

13 Waste chute (waste input tube)
14 Nozzle 14a 1st nozzle part 14b 2nd nozzle part 14c 3rd nozzle part 15 Wet mill 15d Inlet part 15h Conveyance blade 16a Recessed part 16c Weir 16d 1st damper apparatus 16e 2nd damper apparatus 18a Conveyance pipe A Waste S slurry

Claims (4)

It is a wet processing apparatus for waste which is made into a slurry by putting waste with water into a wet mill and pulverizing it, and sending this slurry through a transport pipe as part of the raw material for firing cement clinker,
A wet processing apparatus for waste, wherein a recess is provided on the downstream side of the wet mill, and a weir flowing over the slurry is provided on an edge on the downstream side of the recess.   A first opening / closing member installed to configure the bottom of the recess, and a second bottom of the recess in the state where the first opening / closing member is disposed below the first opening / closing member and is open. The waste treatment apparatus according to claim 1, further comprising a second opening / closing member installed accordingly.   3. The waste injection pipe for introducing the waste into the wet mill is provided with a nozzle for ejecting the water so as to generate a water flow along the inner surface of the waste injection pipe. A wet processing apparatus for the described waste. The wet mill is configured to rotate around an axis so that the waste is pulverized and stirred with the water to form a slurry.
The inlet part of the wet mill is provided with a conveying blade that feeds waste and water flowing out from the outlet of the waste input pipe into the wet mill by rotating around the axis together with the wet mill. The wet processing apparatus for waste according to any one of claims 1 to 3.

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