JP2019039625A - Waste treatment facility, metal recovery method and waste treatment method - Google Patents

Abstract

To provide a waste treatment facility capable of recovering at least one of precious metal and heavy metal from fluid medium discharged from a gasification furnace.SOLUTION: A waste treatment facility comprises: a gasification furnace (10) having a discharge port (10a) capable of discharging mixture, wherein the mixture contains fluid medium and incombustible having a larger contour than a contour of the fluid medium; and a specific gravity separation part (40) configured to separate precious metal and heavy metal from the fluid medium discharged from the discharge port (10a). The specific gravity separation part (40) is configured to separate the precious metal and the heavy metal from the fluid medium, based on the difference between a specific gravity of media other than the precious metal and heavy metal in the fluid medium, and a specific gravity of the precious metal and heavy metal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waste treatment facility.

  2. Description of the Related Art Conventionally, in a waste treatment facility equipped with a fluidized bed type gasification furnace, one that classifies iron and aluminum from a fluid medium extracted from the gasification furnace is known. For example, Patent Document 1 discloses a waste treatment facility including a fluidized bed type gasification furnace, a classification device, and a metal sorting device. A gasification furnace is a furnace which takes out combustible gas from the waste by heating waste in a fluidized bed formed by fluidizing a fluid medium with fluidization gas. The gasification furnace has an outlet capable of discharging a mixture containing a non-combustible material such as metal and a fluid medium. The classifier separates the mixture discharged from the discharge port into a fluid medium and an incombustible material (coarse material) having an outer shape larger than the outer shape of the fluid medium. The fluid medium separated by the classifier is returned to the gasification furnace, while the non-combustible material separated by the classifier is sent to the metal separator. A metal sorter separates iron and aluminum from non-combustible materials sent from a classifier.

JP 2010-230270 A

  Recently, it has been found that the waste supplied to the gasification furnace contains a small amount of precious metals (platinum, gold, silver, copper, etc.) and heavy metals, and there is a need to recover them. However, in a waste treatment facility such as Patent Document 1, it is difficult to recover those metals. Specifically, since the particle size of the noble metal or heavy metal is the same as or smaller than the particle size of the fluidized medium, in the classifier, the noble metal and heavy metal together with the fluidized medium from the mixture discharged from the gasifier outlet. It is separated and returned to the gasifier with the fluid medium.

  An object of the present invention is to provide a waste processing facility, a metal recovery method, and a waste processing method capable of recovering at least one of noble metal and heavy metal from a fluid medium discharged from a gasification furnace.

  As means for solving the above-mentioned problems, the present invention provides gasification in which combustible gas is extracted from waste by heating the waste in a fluidized bed formed by fluidizing a fluidized medium with fluidized gas. A furnace having a discharge port capable of discharging a mixture containing the fluid medium and a non-combustible material having an outer shape larger than the outer shape of the fluid medium, and discharged from the discharge port of the gasification furnace A specific gravity separation unit that separates the noble metal and heavy metal from the fluid medium, and the specific gravity separation unit is based on the difference between the specific gravity of the medium other than the noble metal and heavy metal and the specific gravity of the noble metal and heavy metal in the fluid medium. Provided is a waste treatment facility for separating the noble metal and heavy metal from the fluid medium.

  This waste treatment facility includes a specific gravity separation unit, and the specific gravity separation unit removes noble metals and heavy metals from the fluidized medium based on the difference between the specific gravity of the medium other than the noble metals and heavy metals and the specific gravity of the noble metals and heavy metals. To separate. Therefore, it becomes possible to collect | recover precious metals and heavy metals effectively from the fluid medium discharged | emitted from the gasification furnace.

  In this case, the apparatus further includes a classification unit provided downstream of the gasification furnace and upstream of the specific gravity separation unit, and the classification unit separates the mixture into the fluid medium and the incombustible material. It is preferable.

  If it does in this way, only a fluidized medium will be effectively supplied to a specific gravity separation part among the mixtures discharged from the outlet of a gasifier. Moreover, it becomes possible to isolate | separate iron, aluminum, etc. which are contained in the said incombustible material from the incombustible material isolate | separated by the classification part.

  The waste treatment facility may further include a return channel that returns the fluid medium separated by the classification unit to the gasification furnace, and the specific gravity separation unit may be provided in the return channel.

  In this aspect, the fluid medium discharged from the discharge port can be reused, and the inflow of the noble metal and heavy metal contained in the fluid medium discharged from the discharge port to the gasifier is suppressed.

  Further, in the waste treatment facility, a part of the fluid medium that is branched from a portion between the specific gravity separation unit and the gasification furnace in the return channel is extracted. It is preferable to further provide an extraction channel.

  If it does in this way, when the quantity of the fluid medium in a gasification furnace becomes large, it will become possible to extract the surplus fluid medium from a return channel. Therefore, fluid flow failure due to an increase in the amount of fluid medium in the gasification furnace is suppressed.

  Further, in the waste treatment facility, a position that is provided at a connection portion between the return flow path and the extraction flow path and that can guide the fluid medium discharged from the specific gravity separation section to the gasification furnace. A switching portion that can be switched to a return position and a sampling position that is a position where at least a part of the fluid medium discharged from the specific gravity separation unit can be guided to the sampling flow path, and the switching unit is a return position And a control unit that switches the switching unit to the sampling position when a condition indicating that the amount of the fluidized medium in the gasification furnace is larger than a set amount in the state of Is preferred.

  In this way, the amount of the fluid medium in the gasifier is automatically maintained substantially at the set amount.

  The waste treatment facility further includes a fluidizing gas supply channel for supplying the fluidizing gas to the gasification furnace, and a pressure sensor provided in the fluidizing gas supply channel, The control unit includes: a determination unit that determines that the condition is satisfied when a detection value of the pressure sensor is equal to or greater than a reference value; and a switching unit that determines that the condition is satisfied by the determination unit. It is preferable to include a switching unit adjustment unit that switches from the return position to the extraction position.

  In this mode, since it is detected that the amount of the fluidized medium in the gasification furnace has increased based on an increase in the pressure loss of the fluidized gas flowing through the fluidized gas supply flow path, switching is performed with high accuracy. The parts can be switched.

  In the waste treatment facility, the flow medium separated in the classification section is returned to the gasification furnace, and the flow medium is branched from the return flow path and discharged from the classification section. An extraction channel for extracting a part thereof, and the specific gravity separation portion may be provided in the extraction channel.

  In this aspect, it is possible to efficiently recover the precious metal and heavy metal by guiding the fluid medium discharged from the classification unit to the specific gravity separation unit through the extraction channel at a specific timing. Specifically, in the process in which the fluid medium circulates through the return channel, the supply of waste to the gasifier is continued, so that the ratio of noble metals and heavy metals contained in the fluid medium gradually increases. Therefore, it is possible to efficiently recover the noble metal and heavy metal by guiding the fluid medium to the specific gravity separation section through the extraction channel at a specific timing.

  Further, in the waste treatment facility, provided at a connection portion between the return flow path and the extraction flow path, the fluid medium discharged from the classification section can be guided to the gasification furnace. A switching unit that can be switched between a certain return position and a sampling position that is a position where at least a part of the fluid medium discharged from the classification unit can be guided to the sampling channel, and the switching unit is in the return position. It is preferable to further include a control unit that switches the switching unit to the sampling position when a condition indicating that the amount of the fluid medium in the gasification furnace is larger than a set amount in the state is satisfied. .

  In this way, the amount of the fluid medium in the gasifier is automatically maintained substantially at the set amount.

  The waste treatment facility further includes a fluidizing gas supply channel for supplying the fluidizing gas to the gasification furnace, and a pressure sensor provided in the fluidizing gas supply channel, The control unit includes: a determination unit that determines that the condition is satisfied when a detection value of the pressure sensor is equal to or greater than a reference value; and a switching unit that determines that the condition is satisfied by the determination unit. It is preferable to include a switching unit adjustment unit that switches from the return position to the extraction position.

  In this mode, since it is detected that the amount of the fluidized medium in the gasification furnace has increased based on an increase in the pressure loss of the fluidized gas flowing through the fluidized gas supply flow path, switching is performed with high accuracy. The parts can be switched.

  Further, in the waste treatment facility, a melting furnace for melting the ash contained in the combustible gas discharged from the gasification furnace, the outlet for discharging the slag formed by the melting of the ash And a regulator supply unit that supplies, as a basicity regulator, the fluid medium extracted from the extraction channel to the melting furnace.

  In this way, the surplus fluid medium in the gasification furnace is effectively used as a basicity adjuster, and the fluid medium extracted from the extraction channel is substantially free of noble metals and heavy metals. An increase in the metal concentration (especially the concentration of lead or zinc) in the slag discharged from the tap is suppressed (decrease in slag quality).

  In this case, the specific gravity separation unit is preferably a dry type.

  In this way, the structure of the separation part is simplified.

  The present invention also provides a gasification furnace for extracting combustible gas from waste by heating the waste in a fluidized bed formed by fluidizing the fluidized medium with a fluidized gas, And a metal recovery method for recovering noble metals and heavy metals from a fluid medium used for a fluid medium having a discharge port capable of discharging a mixture including a non-combustible material having an outer shape larger than the outer shape of the fluid medium, A gasification step of generating a combustible gas from the waste by heating the waste, and a specific gravity of a medium other than the noble metal and heavy metal of the fluid medium discharged from the outlet, and the noble metal and heavy metal And a specific gravity separation step of separating the noble metal and heavy metal from the fluid medium based on a difference from the specific gravity.

  In this specific metal recovery method, in the specific gravity separation step, the noble metal and heavy metal are separated from the fluid medium based on the difference between the specific gravity of the medium other than the noble metal and heavy metal in the fluid medium and the specific gravity of the noble metal and heavy metal. It is possible to effectively recover noble metals and heavy metals from the fluid medium discharged from the storage medium.

  The metal recovery method preferably further includes a classification step of separating the mixture into the fluid medium and the incombustible material after the gasification step and before the specific gravity separation step.

  If it does in this way, in a specific gravity separation process, it will become possible to isolate | separate effectively only a fluid medium among the mixtures discharged | emitted from the discharge port of the gasifier. Moreover, it becomes possible to isolate | separate iron, aluminum, etc. which are contained in the said incombustible material from the incombustible material isolate | separated at the classification process.

  The metal recovery method may further include a return step of returning the fluid medium separated in the classification step to the gasification furnace, and the specific gravity separation step may be performed in the return step.

  Alternatively, in the metal recovery method, a return step of returning the fluid medium separated in the classification step to the gasification furnace, and a sampling step of extracting a part of the fluid medium returned to the gasification furnace in the return step; The specific gravity separation step may be performed in the sampling step.

  The present invention also relates to a waste treatment method for treating waste, which is combustible from the waste by heating the waste in a fluidized bed formed by fluidizing a fluid medium with a fluidizing gas. In a gasification furnace for taking out a characteristic gas, the gasification furnace having a discharge port capable of discharging a mixture containing the fluid medium and a non-combustible material having an outer shape larger than the outer shape of the fluid medium. A gasification step for generating a combustible gas from the waste by heating the waste, and a melting furnace for melting the ash contained in the combustible gas discharged from the gasification furnace, by melting the ash The flow separated in the melting step for melting the ash and the specific gravity separation step in the metal recovery method in the one having an outlet for discharging the formed slag At least a portion of the body, as the basicity adjusting agent and an adjusting agent supply step of supplying to the melting furnace, provides waste treatment methods.

  In the present waste treatment method, noble metals and heavy metals are effectively recovered from the fluid medium, and an increase in the metal concentration of slag discharged from the outlet (decrease in slag quality) is suppressed.

  As described above, according to the present invention, it is possible to provide a waste processing facility, a metal recovery method, and a waste processing method that can recover at least one of noble metals and heavy metals from a fluid medium discharged from a gasification furnace. It becomes.

It is a figure which shows the outline of the waste disposal facility of 1st Embodiment of this invention. It is a figure which shows the outline of the waste disposal facility of 2nd Embodiment of this invention.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
A waste treatment facility according to a first embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, the waste treatment facility of the present embodiment includes a fluidized bed type gasification furnace 10, a classification unit 20, a return channel 30, a specific gravity separation unit 40, and a sampling channel 50. , A control unit 60, a melting furnace 70, and a regulator supply unit 80.

  The gasification furnace 10 takes out combustible gas from the waste by heating the waste in a fluidized bed 12 formed by fluidizing a fluid medium (eg, sand) with a fluidized gas. The fluidizing gas is supplied to the lower part of the gasification furnace 10 through the fluidizing gas supply channel 14. A pressure sensor 63 is provided in the fluidizing gas supply channel 14. The gasification furnace 10 has a discharge port 10a capable of discharging a mixture containing a fluid medium and a non-combustible material having an outer shape larger than the outer shape of the fluid medium.

  The classification unit 20 is provided on the downstream side of the discharge port 10a of the gasification furnace 10, and separates (classifies) the mixture discharged from the discharge port 10a into a fluid medium and an incombustible material. The classifying unit 20 separates the two based on the size of the outer shape of the fluid medium and the size of the outer shape of the incombustible material. The classification unit 20 includes a first discharge chamber 21 that separates incombustible materials from the mixture and discharges the incombustible materials, and a second discharge chamber 22 that is provided below the first discharge chamber 21 and discharges a fluid medium. Have. Note that the incombustible material separated in the classification unit 20 is separated into iron, aluminum, and other incombustible materials.

  The return flow path 30 is a flow path for returning the fluidized medium separated by the classification unit 20 to the gasification furnace 10. The upstream end of the return channel 30 is connected to the second discharge chamber 22. The downstream end of the return channel 30 is connected to a portion of the gasification furnace 10 above the surface of the fluidized bed 12.

  The specific gravity separator 40 separates noble metals (platinum, gold, silver, copper, etc.) and heavy metals (lead, zinc, etc.) from the fluid medium. Specifically, the specific gravity separation unit 40 separates the noble metal and the heavy metal from the fluid medium based on the difference between the specific gravity of the medium (eg, sand) other than the noble metal and heavy metal in the fluid medium and the specific gravity of the noble metal and heavy metal. . In the present embodiment, a dry type is used as the specific gravity separation unit 40. Specifically, the specific gravity separation unit 40 includes a gas supply unit 41 and a vibration unit 42. The gas supply unit 41 supplies a gas such as air toward the vibration unit 42. The vibration part 42 includes a receiving part that receives the fluid medium, a plurality of holes that allow the gas supplied from the gas supply part 41 to pass therethrough and a vibration plate that can vibrate, and substantially contains noble metal and heavy metal. A medium discharge portion 42a for discharging a non-flowing medium (such as dredged sand) and a metal discharge portion 42b for discharging precious metal and heavy metal. In the present embodiment, the specific gravity separation unit 40 is provided in the return channel 30. Specifically, the receiving part of the vibrating part 42 and the medium discharging part 42 a are connected to the return channel 30.

  The extraction flow path 50 is branched from the return flow path 30, and a part of the flowing medium (medium substantially not containing noble metal and heavy metal) discharged from the medium discharge section 42a of the specific gravity separation section 40 is exposed to the outside. This is a flow path for extraction.

  A switching unit 32 is provided at a connection portion between the extraction channel 50 and the return channel 30. The switching unit 32 draws out at least a part of the return position, which is a position where the fluid medium discharged from the specific gravity separation unit 40 can be guided to the gasification furnace 10, and the fluid medium discharged from the specific gravity separation unit 40. It is possible to switch to a sampling position that is a position that can be guided to the path 50.

  When the condition indicating that the amount of the fluidized medium in the gasification furnace 10 is larger than the set amount in the state where the switching unit 32 is in the return position, the control unit 60 sets the switching unit 32 to the sampling position. Switch. Specifically, the control unit 60 includes a determination unit 61 and a switching unit adjustment unit 62.

  The determination unit 61 determines that the condition is satisfied when the detected value of the pressure sensor 63 provided in the fluidizing gas supply flow path 14 is equal to or greater than a reference value. Since the detected value of the pressure sensor 63 is proportional to the magnitude of the pressure loss of the fluidizing gas in the fluidizing gas supply flow path 14, when the detected value exceeds the reference value, It can be determined that the amount of the fluid medium has become larger than the set amount. The determination unit 61 determines that the condition is not satisfied when the detection value of the pressure sensor 63 is less than the reference value.

  The switching unit adjustment unit 62 switches the switching unit 32 from the return position to the sampling position when the determination unit 61 determines that the condition is satisfied. The switching unit adjustment unit 62 maintains the switching unit 32 in the return position while the determination unit 61 determines that the condition is not satisfied.

  The melting furnace 70 is a furnace for burning the combustible gas generated in the gasification furnace 10 and melting the ash contained in the combustible gas. The melting furnace 70 discharges a primary combustion chamber 71 that burns combustible gas, a secondary combustion chamber 72 that further burns the gas discharged from the primary combustion chamber 71, and slag formed by melting of ash. And an outlet 70a.

  The adjusting agent supply unit 80 supplies a basicity adjusting agent to the melting furnace 70. The adjusting agent supply unit 80 supplies, as a basicity adjusting agent, a chemical including a fluid medium (a medium that substantially does not contain noble metals and heavy metals) extracted from the extraction flow path 50 to the melting furnace 70. In the present embodiment, the adjusting agent supply unit 80 supplies the basicity adjusting agent from a portion of the melting furnace 70 on the downstream side of the tap outlet 70a.

  Next, the operation of the waste treatment facility described above will be described.

  First, waste is supplied to the gasification furnace 10 in a state where the fluidization gas is supplied to the gasification furnace 10 through the fluidization gas supply channel 14 (a state where the fluidized bed 12 is formed). Then, the waste is heated in the fluidized bed 12 and combustible gas is generated in the gasification furnace 10. This process corresponds to a gasification process. This combustible gas is introduced into the melting furnace 70.

  On the other hand, the mixture containing the fluid medium and the incombustible material is discharged from the discharge port 10 a of the gasification furnace 10 and separated into the fluid medium and the incombustible material by the classifying unit 20. This process corresponds to a classification process. The incombustible material separated from the mixture by the classification unit 20 is then further separated into iron, aluminum, and other incombustible materials. On the other hand, the fluid medium separated from the mixture by the classification unit 20 is supplied to the specific gravity separation unit 40 through the return channel 30.

  The specific gravity separation unit 40 separates the noble metal and the heavy metal from the fluid medium based on the difference between the specific gravity of the medium other than the noble metal and the heavy metal and the specific gravity of the noble metal and the heavy metal in the fluid medium supplied to the specific gravity separation unit 40. This corresponds to a specific gravity separation step. Specifically, in a state where gas is supplied from the gas supply unit 41 to the vibration unit 42, the vibration unit 42 vibrates. Then, a medium having a relatively small specific gravity (medium other than noble metals and heavy metals) is discharged from the medium discharge part 42a, while a noble metal and a heavy metal having a relatively high specific gravity is flowing from the medium discharge part 42b. Discharged from. In this way, noble metals and heavy metals are recovered from the fluid medium.

  Then, while the switching unit 32 is in the return position, the fluid medium discharged from the medium discharge unit 42 a to the return flow path 30 is returned to the gasification furnace 10. Here, when the pressure of the fluidized gas (detected value of the pressure sensor 63) becomes equal to or higher than the reference value, the switching unit 32 is switched to the extraction position by the switching unit adjustment unit 62. Thereby, a part of the fluid medium discharged from the medium discharge portion 42 a to the return flow path 30 is extracted outside through the extraction flow path 50.

  In parallel with the above operation, the combustible gas discharged from the gasification furnace 10 burns in the primary combustion chamber 71 of the melting furnace 70. Thereby, the ash contained in the combustible gas is melted, and the slag formed by the melting is discharged from the tap outlet 70a.

  Here, the fluid medium extracted from the extraction channel 50 (medium substantially free of noble metal and heavy metal) is supplied from the adjusting agent supply unit 80 to the melting furnace 70 as a basicity adjusting agent. This corresponds to a regulator supply process.

  As described above, the waste treatment facility according to the present embodiment includes the specific gravity separation unit 40. The specific gravity separation unit 40 includes a specific gravity of a medium other than the noble metal and the heavy metal and a specific gravity of the noble metal and the heavy metal. Based on the difference, noble metals and heavy metals are separated from the fluid medium. Therefore, it is possible to effectively recover the noble metal and heavy metal from the fluid medium discharged from the gasification furnace 10.

  Further, since the classification unit 20 is provided on the downstream side of the gasification furnace 10 and on the upstream side of the specific gravity separation unit 40, only the fluid medium is effectively used in the mixture discharged from the discharge port 10a of the gasification furnace 10. It is supplied to the specific gravity separation unit 40. Moreover, it becomes possible to isolate | separate iron, aluminum, etc. which are contained in the said incombustible material from the incombustible material isolate | separated by the classification part 20. FIG.

  In this embodiment, since the specific gravity separation part 40 is provided in the return flow path 30, the reuse of the fluid medium discharged | emitted from the discharge port 10a, and the noble metal contained in the fluid medium discharged | emitted from the discharge port 10a And the suppression of the inflow of heavy metal into the gasification furnace 10 is achieved.

  Furthermore, since the waste treatment facility of the present embodiment includes the switching unit 32 and the control unit 60, the amount of the fluid medium in the gasification furnace 10 is automatically maintained substantially at the set amount. Therefore, the flow failure of the fluidized medium due to the increased amount of the fluidized medium in the gasification furnace 10 is suppressed.

  In addition, the waste treatment facility according to the present embodiment supplies the adjusting agent that supplies the fluidized medium (medium substantially free of noble metals and heavy metals) extracted from the extraction flow path 50 to the melting furnace 70 as a basicity adjusting agent. Part 80 is provided. Therefore, the surplus fluid medium in the gasification furnace 10 is effectively used as a basicity adjusting agent, and the fluid medium extracted from the extraction channel 50 is substantially free of noble metals and heavy metals. An increase in the metal concentration (especially the concentration of lead or zinc) in the slag discharged from the shed 70a (a decrease in slag quality) is suppressed.

(Second Embodiment)
Next, a waste treatment facility according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, only parts different from the first embodiment will be described, and the description of the same structure, operation, and effect as in the first embodiment will be omitted.

  In the waste treatment facility of the present embodiment, the arrangement of the specific gravity separation unit 40 is different from that of the first embodiment. Specifically, in the present embodiment, the specific gravity separation unit 40 is provided in the extraction flow path 50. More specifically, the receiving part of the vibration part 42 and the medium discharge part 42 a are connected to the extraction flow path 50.

  In the present embodiment, the noble metal and heavy metal can be efficiently recovered by guiding the fluid medium discharged from the classification unit 20 to the specific gravity separation unit 40 through the extraction flow path 50 at a specific timing. Specifically, in the process in which the fluid medium circulates through the return channel 30, the supply of waste to the gasification furnace 10 is continued, so that the ratio of noble metals and heavy metals contained in the fluid medium gradually increases. Therefore, it is possible to efficiently recover the noble metal and heavy metal by guiding the fluid medium to the specific gravity separation unit 40 through the extraction flow path 50 at a specific timing. Moreover, in this aspect, since the temperature of the fluid medium supplied to the specific gravity separation unit 40 is lower than that in the first embodiment, damage to the specific gravity separation unit 40 due to heat is suppressed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first embodiment, the extraction channel 50 may be omitted.

  Further, the adjustment agent supply unit 80 may supply a chemical other than the fluid medium extracted from the extraction flow channel 50 to the melting furnace 70 as a basicity adjustment agent.

  The determination unit 61 may determine that the condition is satisfied when a detection value of a position sensor capable of detecting the position of the surface of the fluidized bed 12 is equal to or greater than a predetermined value.

  Further, the waste treatment facility of the above embodiment separates the noble metal and heavy metal discharged from the metal discharge unit 42b of the specific gravity separation unit 40 into noble metal and heavy metal based on the difference between the specific gravity of the noble metal and the specific gravity of the heavy metal. A second specific gravity separation unit (not shown) may be further provided.

DESCRIPTION OF SYMBOLS 10 Gasification furnace 10a Discharge port 12 Fluidized bed 20 Classification part 30 Return flow path 32 Switching part 40 Specific gravity separation part 41 Gas supply part 42 Vibrating part 42a Medium discharge part 42b Metal discharge part 50 Extraction flow path 60 Control part 61 Judgment part 62 Switching unit adjusting unit 63 Pressure sensor 70 Melting furnace 70a Outlet 80 Adjusting agent supply unit

Claims (16)

A gasification furnace for extracting a combustible gas from a waste by heating the waste in a fluidized bed formed by fluidizing the fluidized medium with a fluidized gas, the outer shape of the fluidized medium and the fluidized medium Having an outlet capable of discharging a mixture containing a non-combustible material having a larger outer shape,
A specific gravity separation unit for separating noble metal and heavy metal from the fluid medium discharged from the discharge port of the gasification furnace,
The specific gravity separation unit is a waste treatment facility that separates the noble metal and heavy metal from the fluid medium based on a difference between a specific gravity of a medium other than the noble metal and heavy metal in the fluid medium and a specific gravity of the noble metal and heavy metal. The waste treatment facility according to claim 1,
Further comprising a classification unit provided on the downstream side of the gasification furnace and on the upstream side of the specific gravity separation unit,
The classification unit is a waste treatment facility that separates the mixture into the fluid medium and the incombustible material. The waste treatment facility according to claim 2,
Further comprising a return flow path for returning the fluid medium separated in the classification section to the gasification furnace,
The specific gravity separation unit is a waste treatment facility provided in the return channel. The waste treatment facility according to claim 3,
A waste material that is branched from a portion between the specific gravity separation unit and the gasification furnace in the return flow channel, and further includes an extraction flow channel for extracting a part of the fluid medium discharged from the specific gravity separation unit. Processing equipment. The waste treatment facility according to claim 4,
The return position and the specific gravity separation section, which are provided at the connection portion between the return flow path and the extraction flow path, and are positions where the fluid medium discharged from the specific gravity separation section can be guided to the gasification furnace A switching unit that can be switched to an extraction position that is a position capable of guiding at least a part of the fluid medium discharged from the extraction channel,
A control unit that switches the switching unit to the sampling position when a condition indicating that the amount of the fluidized medium in the gasification furnace is larger than a set amount in a state where the switching unit is in the return position. And a waste treatment facility. The waste treatment facility according to claim 5,
A fluidizing gas supply channel for supplying the fluidizing gas to the gasification furnace;
A pressure sensor provided in the fluidizing gas supply flow path,
The controller is
A determination unit that determines that the condition is satisfied when a detection value of the pressure sensor is equal to or greater than a reference value;
A waste treatment facility, comprising: a switching unit adjustment unit that switches the switching unit from the return position to the sampling position when the determination unit determines that the condition is satisfied. The waste treatment facility according to claim 2,
A return flow path for returning the fluid medium separated in the classification section to the gasification furnace;
An extraction channel that branches off from the return channel and extracts a part of the fluid medium discharged from the classification unit;
The specific gravity separation unit is a waste treatment facility provided in the extraction channel. The waste treatment facility according to claim 7,
It is provided at the connecting portion between the return flow channel and the extraction flow channel, and is discharged from the return position and the classification portion where the fluid medium discharged from the classification portion can be guided to the gasification furnace. A switching unit that can be switched to an extraction position that is a position capable of guiding at least a part of the fluidized medium to the extraction channel;
A control unit that switches the switching unit to the sampling position when a condition indicating that the amount of the fluidized medium in the gasification furnace is larger than a set amount in a state where the switching unit is in the return position. And a waste treatment facility. The waste treatment facility according to claim 8,
A fluidizing gas supply channel for supplying the fluidizing gas to the gasification furnace;
A pressure sensor provided in the fluidizing gas supply flow path,
The controller is
A determination unit that determines that the condition is satisfied when a detection value of the pressure sensor is equal to or greater than a reference value;
A waste treatment facility, comprising: a switching unit adjustment unit that switches the switching unit from the return position to the sampling position when the determination unit determines that the condition is satisfied. The waste treatment facility according to any one of claims 4 to 9,
A melting furnace for melting the ash contained in the combustible gas discharged from the gasification furnace, and having an outlet for discharging the slag formed by melting the ash;
A waste treatment facility, further comprising: an adjusting agent supply unit that supplies the fluid medium extracted from the extraction channel as a basicity adjusting agent to the melting furnace. The waste treatment facility according to any one of claims 1 to 10,
The specific gravity separation unit is a waste treatment facility that is dry. A gasification furnace for extracting a combustible gas from a waste by heating the waste in a fluidized bed formed by fluidizing the fluidized medium with a fluidized gas, the outer shape of the fluidized medium and the fluidized medium A metal recovery method for recovering noble metals and heavy metals from a fluid medium used for one having an outlet capable of discharging a mixture containing a non-combustible material having a larger outer shape,
A gasification step of generating a combustible gas from the waste by heating the waste in the fluidized bed;
A specific gravity separation step of separating the noble metal and heavy metal from the fluid medium based on a difference between a specific gravity of the medium other than the noble metal and heavy metal and a specific gravity of the noble metal and heavy metal of the fluid medium discharged from the discharge port; A metal recovery method. The metal recovery method according to claim 12,
A metal recovery method, further comprising a classification step of separating the mixture into the fluid medium and the incombustible material after the gasification step and before the specific gravity separation step. The metal recovery method according to claim 13,
A step of returning the fluidized medium separated in the classification step back to the gasification furnace;
The specific gravity separation step is a metal recovery method performed in the return step. The metal recovery method according to claim 13,
Returning the fluidized medium separated in the classification step to the gasification furnace;
A drawing step of extracting a part of the fluid medium returned to the gasification furnace in the returning step,
The specific gravity separation step is a metal recovery method performed in the sampling step. A waste treatment method for treating waste,
A gasification furnace for extracting a combustible gas from a waste by heating the waste in a fluidized bed formed by fluidizing the fluidized medium with a fluidized gas, wherein the fluidized medium and the fluidized medium Gasification in which combustible gas is generated from the waste by heating the waste in the fluidized bed in one having an outlet capable of discharging a mixture containing a non-combustible material having an outer shape larger than the outer shape. Process,
Melting the ash in a melting furnace for melting ash contained in the combustible gas discharged from the gasification furnace and having an outlet for discharging slag formed by melting the ash Melting process
A regulator supply step of supplying at least a part of the fluidized medium separated in the specific gravity separation step in the metal recovery method according to any one of claims 13 to 15 to the melting furnace as a basicity regulator. , Waste disposal methods.

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