Uranium-containing alkaline residue pretreatment system and method

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a uranium-containing alkaline residue pretreatment system and method. Aiming at the blank in the field of uranium-containing alkaline residue pretreatment, the technical scheme of the uranium-containing alkaline residue pretreatment system and process is provided for the first time, in a sealed environment, the functions of automatic sorting, automatic drying, automatic double crushing and the like of uranium-containing alkaline residues are achieved, the sealed glove box ensures that radioactive dust in a workplace is effectively isolated, and the uranium-containing alkaline residue treatment efficiency is improved. And the health of operators is protected. The uranium-containing alkaline residues are efficiently and safely pretreated, the field radiation health protection condition is improved, the subsequent uranium-containing alkaline residue treatment efficiency is further improved, and the uranium-containing alkaline residue treatment difficulty is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to a system and method for pretreating uranium-containing alkaline slag. Background Art

[0002] Uranium-containing alkaline slag can be expressed as a type of uranium-containing waste generated during the processing of nuclear fuel elements, mainly from the treatment of uranium-containing wastewater. If the uranium-containing alkaline slag is not treated in time, it will not only cause a large amount of uranium resources to be deposited, but also pose a high criticality safety risk. Therefore, the recycling and reuse of uranium-containing alkaline slag has significant social benefits and economic value.

[0003] In the related art, the uranium-containing alkali slag recovery line cannot directly recycle the uranium-containing alkali slag, and the uranium-containing alkali slag needs to be pretreated before entering the uranium-containing alkali slag recovery line. Due to the complex composition of the uranium-containing alkali slag, a mature process and supporting equipment for the pretreatment of the uranium-containing alkali slag have not yet been found. If the uranium-containing alkali slag is not pretreated, the subsequent recovery and disposal process of the uranium-containing alkali slag will be inefficient, the uranium resources in the uranium-containing alkali slag cannot be fully utilized, the recovery rate of uranium in the uranium-containing alkali slag is not high, and the difficulty and cost of the uranium-containing alkali slag treatment will also be increased. Summary of the invention

[0004] In order to overcome the problems existing in the related art, a system and method for pretreating uranium-containing alkaline slag are provided.

[0005] According to one aspect of an embodiment of the present disclosure, a uranium-containing alkaline slag pretreatment system is provided, wherein the main body of the system is a sealed glove box, wherein a plurality of partitions are vertically arranged inside the sealed glove box, and the inner cavity of the sealed glove box is divided into a crushing chamber, a drying chamber, and a vibrating screening chamber;

[0006] The middle section of the inner cavity of the vibrating screen chamber is equipped with a barrel lifting and flipping mechanism and a vibrating screen. The clamping end of the barrel lifting and flipping mechanism is used to clamp the barrel. The bottom layer of the inner cavity of the vibrating screen chamber is provided with a temporary storage bucket for foreign matter. The temporary storage bucket for foreign matter is used to receive foreign matter screened out by the vibrating screen.

[0007] An exhaust duct is arranged on the top surface of the closed glove box, and the air inlet ports of the exhaust duct respectively penetrate into the inner cavities of the crushing chamber, the drying chamber and the vibrating screen chamber, and the exhaust end of the exhaust duct is connected to the main exhaust duct of the factory; a feeding pneumatic sealed door is arranged on the outside of the closed glove box close to the side wall of the vibrating screen chamber, and a feeding conveying roller is arranged inside the feeding pneumatic sealed door, and a roller extending into the inner cavity of the vibrating screen chamber is also arranged at the conveying end of the feeding conveying roller. The barrel containing the uranium-containing alkali slag material is placed on the roller to be grabbed by the barrel lifting and flipping mechanism and dumped into the vibrating screen;

[0008] A drying device is arranged in the middle section of the inner cavity of the drying chamber, and a plurality of drying material trays are placed inside the drying device; a vibrating feeder is installed on the upper layer of the inner cavity of the crushing chamber, a jaw crusher and a hammer crusher are installed in the middle section of the inner cavity of the crushing chamber, a hopper is installed on the bottom layer of the inner cavity of the crushing chamber, and a lifting and turning mechanism extending to the upper layer of the inner cavity of the crushing chamber is installed on the side wall of the bottom of the inner cavity of the crushing chamber; the discharge port of the vibrating feeder is connected with the feed port of the jaw crusher, the discharge port of the jaw crusher is connected with the feed port of the hammer crusher, the discharge port of the hammer crusher is located above the feed port of the hopper, and the discharge port of the hopper is provided with a discharge port which penetrates to the left side of the closed glove box.

[0009] In a possible implementation, the vibrating screen includes an upper sieve plate and a lower sieve plate, and the upper sieve plate is installed with a pipeline for vibrating and transporting foreign matter on the sieve plate to a foreign matter temporary storage barrel for storage.

[0010] In a possible implementation, a sealed chamber sealed door for maintenance is provided on the back surface of the sealed glove box.

[0011] In a possible implementation, an air filter and an exhaust fan are further provided at the bottom layer of the inner cavity of the drying chamber.

[0012] According to one aspect of an embodiment of the present disclosure, a method for pretreating uranium-containing alkaline slag is provided, the method comprising:

[0013] Step 100, use a cart or a feeder to transport the slag bucket to the feed end conveyor roller, turn on the exhaust fan connected to the exhaust pipe, and open the feed pneumatic closed door at the same time. The feed end conveyor roller conveys the slag bucket into the vibrating screen chamber, and closes the feed pneumatic closed door;

[0014] Step 101, after the cover opener of the vibration screening chamber cooperates to open the barrel cover, the barrel lifting and flipping mechanism automatically holds the slag barrel tightly and lifts it to the flipping position, then pours the uranium-containing alkaline slag in the slag barrel into the vibration screen, turns on the vibration screen for mechanical screening, and the screened material of the vibration screen is loaded on a plate;

[0015] Step 102, placing the loaded uranium-containing alkaline slag into a microwave drying device, and turning on the air filter and the exhaust fan to heat and dry the slag;

[0016] Step 103, pour the dried uranium-containing alkaline slag into the crushing process barrel, use the electric lifting mechanism to send the dried slag into the vibrating feeder, start the vibrating feeder to transport it to the jaw crusher for crushing; after crushing, enter the hammer crusher for secondary crushing; the material with a particle size reaching a preset particle size threshold is discharged.

[0017] In a possible implementation, in step 101, it is determined whether the screened material needs to be loaded into a drum for mechanical screening again depending on the state of the screened material, and the screened material falls into a temporary foreign matter storage barrel, and the metal contained in the screened material is subsequently recovered.

[0018] In a possible implementation, in step 103, the material with a particle size of 0.5-1 mm is discharged.

[0019] The beneficial effects of the present disclosure are as follows: the present disclosure aims at the blank in the field of uranium-containing alkali slag pretreatment, and firstly proposes a technical solution of a uranium-containing alkali slag pretreatment system and process, and realizes the functions of automatic sorting, automatic drying, automatic double crushing, etc. of uranium-containing alkali slag in a sealed environment, and the closed glove box ensures that the radioactive dust in the workplace is effectively isolated to protect the health of the operators. The efficient and safe pretreatment of uranium-containing alkali slag is realized, the radiation health protection conditions on site are improved, and the subsequent uranium-containing alkali slag treatment efficiency is further improved, and the difficulty of uranium-containing alkali slag disposal is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of a uranium-containing alkaline slag pretreatment system shown in an embodiment of the present disclosure.

[0021] Figure 2 It is a right view of a uranium-containing alkaline slag pretreatment system shown in an embodiment of the present disclosure.

[0022] Figure 3 It is a left view of a uranium-containing alkaline slag pretreatment system shown in an embodiment of the present disclosure.

[0023] Figure 4 It is a top view of a uranium-containing alkaline slag pretreatment system shown in an embodiment of the present disclosure.

[0024] Figure 5 It is a flow chart of a method for pretreating uranium-containing alkaline slag shown in an embodiment of the present disclosure.

[0025] In the figure:

[0026] 1. Closed glove box; 2. Barrel lifting and flipping mechanism; 3. Barrel; 4. Vibrating screen;

[0027] 5. Pneumatic airtight door for feeding; 6. Feed conveying roller; 7. Temporary storage barrel for foreign matter; 8. Roller;

[0028] 9. Drying tray; 10. Drying equipment; 11. Air extraction pipeline; 12. Lifting and turning mechanism;

[0029] 13. Hopper; 14. Discharge port; 15. Hammer crusher; 16. Jaw crusher;

[0030] 17. Vibrating feeder; 18. Sealed door of sealed chamber. DETAILED DESCRIPTION

[0031] The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Unless otherwise defined, the technical and scientific terms used in the present disclosure have the same meanings as those generally understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the term "including" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions. Obviously, the embodiments described in the present disclosure are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative efforts are within the scope of protection of the present disclosure.

[0033] Reference to "embodiments" in this disclosure means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] See also Figures 1 to 4 The main body of the uranium-containing alkaline slag pretreatment system disclosed in the present invention is a sealed glove box 1. A plurality of partitions are vertically arranged inside the sealed glove box 1 to divide the inner cavity of the sealed glove box 1 into a crushing chamber, a drying chamber and a vibrating screening chamber.

[0035] The vibrating screening chamber contains inlet and outlet conveying rollers, lifting mechanism, screening and sorting device; the drying chamber contains a microwave drying device; the crushing chamber contains a vibrating feeding device, a jaw crushing device, a hammer crushing device, and an electronic control system.

[0036] A barrel lifting and turning mechanism 2 and a vibrating screen 4 are installed in the middle section of the inner cavity of the vibrating screen chamber, and the clamping end of the barrel lifting and turning mechanism 2 is used to clamp the barrel 3. A foreign matter temporary storage barrel 7 is provided at the bottom of the inner cavity of the vibrating screen chamber, and the foreign matter temporary storage barrel 7 is used to hold foreign matter screened out by the vibrating screen 4.

[0037] An exhaust duct 11 is arranged on the top surface of the closed glove box 1, and the air inlet ports of the exhaust duct 11 penetrate into the inner cavities of the crushing chamber, the drying chamber and the vibrating screen chamber respectively, and the exhaust end of the exhaust duct 11 is connected to the factory exhaust main duct; a feed pneumatic sealed door 5 is provided on the outside of the closed glove box 1 close to the side wall of the vibrating screen chamber, and a feed conveying roller 6 is arranged inside the feed pneumatic sealed door 5, and a roller 8 extending into the inner cavity of the vibrating screen chamber is also arranged at the conveying end of the feed conveying roller 6, and a barrel 3 containing uranium-containing alkali slag material is placed on the roller 8 for being grabbed by the barrel lifting and turning mechanism 2 and dumped into the vibrating screen 4.

[0038] The vibrating screen 4 includes an upper sieve plate and a lower sieve plate. The upper sieve plate is installed with a pipe for vibrating and transporting foreign matter on the sieve plate to the foreign matter temporary storage barrel 7 for preservation. A sealed chamber sealed door 18 for maintenance is provided on the back surface of the closed glove box 1.

[0039] A drying device 10 is arranged in the middle section of the inner cavity of the drying chamber, and a plurality of drying material trays 9 are placed inside the drying device 10. An air filter and an exhaust fan are also arranged at the bottom layer of the inner cavity of the drying chamber. A vibrating feeder 17 is installed at the upper layer of the inner cavity of the crushing chamber, a jaw crusher 16 and a hammer crusher 15 are installed in the middle section of the inner cavity of the crushing chamber, a hopper 13 is installed at the bottom layer of the inner cavity of the crushing chamber, and a lifting and flipping mechanism 12 extending to the upper layer of the inner cavity of the crushing chamber is installed on the side wall of the bottom of the inner cavity of the crushing chamber.

[0040] The discharge port of the vibrating feeder 17 is connected to the feed port of the jaw crusher 16, and the discharge port of the jaw crusher 16 is connected to the feed port of the hammer crusher 15. The discharge port of the hammer crusher 15 is located above the feed port of the hopper 13, and the discharge port of the hopper 13 is equipped with a discharge port 14 that penetrates to the left side of the closed glove box 1.

[0041] See also Figure 5 The uranium alkali slag pretreatment method disclosed in the present invention includes the following steps.

[0042] Step 100, use a cart or feeder to transport the slag bucket to the feed end conveyor roller, turn on the exhaust fan connected to the exhaust pipe, and open the feed pneumatic closed door at the same time. The feed end conveyor roller sends the slag bucket into the vibrating screen chamber, and closes the feed pneumatic closed door.

[0043] Step 101, after the cover opener of the vibrating screen chamber cooperates to open the barrel cover, the barrel lifting and flipping mechanism automatically holds the slag barrel tightly and lifts it to the flipping position, then pours the uranium-containing alkaline slag in the slag barrel into the vibrating screen, turns on the vibrating screen for mechanical screening, and loads the screened material onto a plate. It is determined whether it needs to be loaded onto a plate again for mechanical screening depending on demand, and the screened material falls into a temporary foreign matter storage barrel, and the metal contained in the screened material is subsequently recovered.

[0044] Step 102, placing the loaded uranium-containing alkaline slag into a microwave drying device, and turning on the air filter and the exhaust fan to heat and dry the slag.

[0045] Step 103, pour the dried uranium-containing alkaline slag into the crushing process barrel, use the electric lifting mechanism to send the dried slag into the vibrating feeder, start the vibrating feeder to transport it to the jaw crusher for crushing; after crushing, enter the hammer crusher for secondary crushing; discharge the slag when the particle size reaches 0.5-1mm.

[0046] The present invention aims at the blank in the field of uranium-containing alkali slag pretreatment, and firstly proposes the technical scheme of uranium-containing alkali slag pretreatment system and process, which realizes the functions of automatic sorting, automatic drying, automatic double crushing, etc. of uranium-containing alkali slag in a sealed environment, and the closed glove box ensures that the radioactive dust in the workplace is effectively isolated to protect the health of operators. It realizes efficient and safe pretreatment of uranium-containing alkali slag, improves the radiation health protection conditions on site, and further improves the efficiency of subsequent uranium-containing alkali slag treatment, and reduces the difficulty of uranium-containing alkali slag disposal.

[0047] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A uranium-containing alkaline slag pretreatment system, characterized in that: The main body of the system is a sealed glove box, and a plurality of partitions are vertically arranged inside the sealed glove box to divide the inner cavity of the sealed glove box into a crushing chamber, a drying chamber and a vibrating sieve chamber; The middle section of the inner cavity of the vibrating screen chamber is equipped with a barrel lifting and flipping mechanism and a vibrating screen. The clamping end of the barrel lifting and flipping mechanism is used to clamp the barrel. The bottom layer of the inner cavity of the vibrating screen chamber is provided with a temporary storage bucket for foreign matter. The temporary storage bucket for foreign matter is used to receive foreign matter screened out by the vibrating screen. An exhaust duct is arranged on the top surface of the closed glove box, and the air inlet ports of the exhaust duct respectively penetrate into the inner cavities of the crushing chamber, the drying chamber and the vibrating screen chamber, and the exhaust end of the exhaust duct is connected to the main exhaust duct of the factory; a feeding pneumatic sealed door is arranged on the outside of the closed glove box close to the side wall of the vibrating screen chamber, and a feeding conveying roller is arranged inside the feeding pneumatic sealed door, and a roller extending into the inner cavity of the vibrating screen chamber is also arranged at the conveying end of the feeding conveying roller. The barrel containing the uranium-containing alkali slag material is placed on the roller to be grabbed by the barrel lifting and flipping mechanism and dumped into the vibrating screen; A drying device is arranged in the middle section of the inner cavity of the drying chamber, and a plurality of drying material trays are placed inside the drying device; a vibrating feeder is installed on the upper layer of the inner cavity of the crushing chamber, a jaw crusher and a hammer crusher are installed in the middle section of the inner cavity of the crushing chamber, a hopper is installed on the bottom layer of the inner cavity of the crushing chamber, and a lifting and turning mechanism extending to the upper layer of the inner cavity of the crushing chamber is installed on the side wall of the bottom of the inner cavity of the crushing chamber; the discharge port of the vibrating feeder is connected with the feed port of the jaw crusher, the discharge port of the jaw crusher is connected with the feed port of the hammer crusher, the discharge port of the hammer crusher is located above the feed port of the hopper, and the discharge port of the hopper is provided with a discharge port which penetrates to the left side of the closed glove box.

2. The system according to claim 1, characterized in that The vibrating screen includes an upper sieve plate and a lower sieve plate. The upper sieve plate is installed with a pipe for vibrating and transporting foreign matter on the sieve plate to a foreign matter temporary storage barrel for storage.

3. The system according to claim 1, characterized in that A sealed chamber sealed door for maintenance is arranged on the back surface of the closed glove box.

4. The system according to claim 1, characterized in that An air filter and an exhaust fan are also provided at the bottom layer of the inner cavity of the drying room.

5. A method for pretreating uranium-containing alkaline slag, characterized in that: The method comprises: Step 100, use a cart or a feeder to transport the slag bucket to the feed end conveyor roller, turn on the exhaust fan connected to the exhaust pipe, and open the feed pneumatic closed door at the same time. The feed end conveyor roller conveys the slag bucket into the vibrating screen chamber, and closes the feed pneumatic closed door; Step 101, after the cover opener of the vibration screening chamber cooperates to open the barrel cover, the barrel lifting and flipping mechanism automatically holds the slag barrel tightly and lifts it to the flipping position, then pours the uranium-containing alkaline slag in the slag barrel into the vibration screen, turns on the vibration screen for mechanical screening, and the screened material of the vibration screen is loaded on a plate; Step 102, placing the loaded uranium-containing alkaline slag into a microwave drying device, and turning on the air filter and the exhaust fan to heat and dry the slag; Step 103, pour the dried uranium-containing alkaline slag into the crushing process barrel, use the electric lifting mechanism to send the dried slag into the vibrating feeder, start the vibrating feeder to transport it to the jaw crusher for crushing; after crushing, enter the hammer crusher for secondary crushing; the material with a particle size reaching a preset particle size threshold is discharged.

6. The method according to claim 5, characterized in that In step 101, it is determined whether the screened material needs to be loaded into a drum again for mechanical screening according to the state of the screened material, and the screened material falls into a temporary foreign matter storage barrel, and the metal contained in the screened material is subsequently recovered.

7. The method according to claim 5, characterized in that In step 103, the material with a particle size of 0.5-1 mm is discharged.

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