Cement solidification equipment

Abstract

To provide a cement solidification device that can increase the amount of liquid waste loaded per one drum to reduce the number of waste drums to be generated, thereby reducing the amount of waste to be generated.SOLUTION: A cement solidification device 100 of the present invention comprises: a filter device 11 that filtrates solid contents in liquid waste; a filtration residue supply unit 8 that supplies, to a washing tank 6, a filtration residue obtained by removing the solid contents through the filter device 11; a washing water supply unit 10 that supplies, to the washing tank 6, filtrate passed through the filter device 11 as washing water; a cement introduction unit 1 that introduces cement into the washing tank 6; and a kneader 5 that kneads the filtration residue and cement introduced into the washing tank 6.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cement solidification apparatus. [Background technology]

[0002] Cement solidification is one of the methods for treating radioactive waste discharged from nuclear power plants, etc. Cement solidification is a method in which cement is poured into radioactive waste contained in drums to solidify it.

[0003] An example of a cement solidification device is the following Patent Document 1. Patent Document 1 describes a radioactive waste treatment facility that can perform injection solidification (a method in which waste is filled into drums in advance, and then a solidification material is injected from above to solidify) and kneading solidification (a method in which waste and a solidification material are kneaded and solidified) in a single facility, and that reduces the generation of radioactive secondary waste. Patent Document 1 describes that "radioactive waste is input into the waste input kneading means during kneading and solidification, and washing waste liquid becomes radioactive secondary waste, but this waste input kneading means can be an in-drum system, so that it is sufficient to wash, for example, only the kneading blades, and the amount of radioactive secondary waste generated can be reduced." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-174588 A Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned Patent Document 1 describes an in-drum kneading type cement solidification equipment that has the characteristic of being able to omit a mechanism for receiving and supplying washing water by discharging the washing water after mixing into a drum can for the next batch. However, the in-drum kneading type cement solidification equipment described in Patent Document 1 has a problem in that when the waste to be treated is liquid, the amount of water that can be mixed with cement = liquid waste + washing water, so the amount of liquid waste that can be treated is reduced by the amount of washing water.

[0006] In view of the above circumstances, an object of the present invention is to provide a cement solidification apparatus that can increase the amount of liquid waste filled per drum and reduce the number of discarded drums, thereby reducing the amount of waste generated. [Means for solving the problem]

[0007] In order to solve the above problem, one aspect of the present invention is a filter device for filtering solids in liquid waste, and a filter device for filtering solids in liquid waste. It was isolated using The cement solidification apparatus is characterized by comprising: a filtration residue supplying unit which supplies the filtration residue to a washing tank; a cleaning water supplying unit which supplies filtrate passed through a filter device to the washing tank as cleaning water; a cement feeding unit which feeds cement into the washing tank; and a kneader which kneads the filtration residue and cement fed into the washing tank.

[0008] More specific configurations of the present invention are described in the claims. Effect of the Invention

[0009] According to the present invention, it is possible to provide a cement solidification apparatus capable of increasing the amount of liquid waste packed into each drum and reducing the number of drums that are discarded, thereby reducing the amount of waste generated.

[0010] Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0011] [Figure 1]Schematic cross-sectional view of the cement solidification device of Example 1 [Diagram 2] Schematic cross-sectional view of the cement solidification device of Example 1 [Diagram 3] Schematic diagram of the spray nozzle of the washing water supply section of the cement solidification apparatus of Example 2 [Figure 4] Schematic diagram of dead-end filter [Diagram 5] Crossflow filter schematic diagram [Figure 6] Flow diagram of the solidification process of the cement solidification device of Example 1 [Figure 7] Cross-sectional schematic diagram of a conventional cement solidification device [Figure 8] Flow diagram of solidification process in a conventional cement solidification device DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0013] 1 and 2 are schematic cross-sectional views of a cement solidification apparatus according to Example 1. As shown in Fig. 1 and Fig. 2, the cement solidification apparatus 100 of the present invention is an in-drum type (a method in which the material to be treated and cement are mixed and injected into one drum), and includes a filter device 11 that filters solid matter in liquid waste 3, which is the material to be treated, and a filter device 11 that filters solid matter in liquid waste 3 through the filter device 11. Removed Solids is The system includes a filtration residue supplying section 8 which supplies the filtration residue to a drum (washing tank) 6, a washing water supplying section 10 which supplies the filtrate passed through a filter device 11 to the drum 6 as washing water, a cement supplying section 1 which supplies cement to the drum 6, and a kneader 5 which kneads the filtration residue and cement supplied to the drum 6.

[0014] The washing water supply unit 10 is equipped with a washing nozzle 2, and supplies filtrate (liquid waste) from which solids have been removed through a filter device 11 as washing water from the washing nozzle 2 to wash the kneader 5.

[0015] The drum can 6 is moved by a moving mechanism 7 such as a conveyor (in the direction of the right arrow in FIG. 2) and, when it is carried to a position directly below the cement solidification device 100 (position A in FIG. 2), it is lifted by a lifting mechanism 20, and liquid waste and cement are charged and mixed from the cement solidification device 100. After mixing, the lifting mechanism 20 lowers the drum can 6 onto the moving mechanism 7, and the drum can 6 containing the cement 30 with the liquid waste sealed inside is moved again (in the direction of the right arrow in FIG. 2). In this way, by sequentially sending the drum cans 6 by the moving mechanism 7, continuous cement solidification processing can be performed.

[0016] As described above, the cement solidification apparatus 100 of the present invention uses the liquid waste 3 as washing water. In order to use the liquid waste 3 as washing water, the liquid waste 3 is filtered using a filter device 11 before being charged into a drum can 6, thereby separating the liquid waste 3 into a filtration residue and a filtrate. Thereafter, the filtration residue is charged into the drum can 6 using a filtration residue supplying unit 8, while the filtrate is supplied to the washing nozzle 2 as washing water by a washing water (filtrate) supplying unit 10.

[0017] FIG. 6 is a flow diagram of the solidification process of the cement solidification apparatus of the first embodiment. As shown in FIG. 6, an empty drum can 6 is carried to a position (position A in FIG. 2) directly below the cement solidification apparatus 100 (S1). Prior to the introduction of liquid waste and cement into the drum can 6, the liquid waste 3 is filtered by the filter device 11 and separated into a filtrate (washing water) and a filtration residue (S21-S23). The filtrate is supplied from the washing water supply unit 10 to the kneader 5 as washing water to wash the kneader 5 (S2). The filtration residue is introduced into the drum can 6 from the filtration residue supply unit 8 (S3). Then, cement is supplied from the cement introduction unit 1 to the drum can (S4) and kneaded by the kneader 5 (S5). Then, the drum can 6 containing the cement 30 that has been solidified and enclosed in the liquid waste is moved (S6). According to the above-mentioned configuration of the cement solidification apparatus 100 of this embodiment, since liquid waste is used as the washing water, the amount of liquid waste packed in one drum can be increased, and the number of waste bodies generated can be reduced.

[0018] Fig. 7 is a schematic cross-sectional view of a conventional cement solidification device, and Fig. 8 is a flow diagram of the solidification process of the conventional cement solidification device. As shown in Fig. 8 and Fig. 9, in the conventional cement solidification device, the washing water used to wash the kneader 5 is discharged into the drum can 6 of the next patch, thereby eliminating the need for a washing water receiving and supplying section. However, when the waste to be treated is liquid waste 3, there is a problem that the amount of liquid waste 3 that can be mixed with cement decreases as the amount of washing water increases. EXAMPLES

[0019] Fig. 3 is a schematic diagram of the spray nozzle of the washing water supply unit of the cement solidification apparatus of Example 2. Hereinafter, improvement in washability when the washing water supply port is a spray nozzle will be described with reference to Fig. 3. By using a spray nozzle 12 for the washing water supply port, it becomes possible to efficiently wash the planetary blades 13 and high-speed blades 14 that constitute the kneader 5. This reduces the amount of washing water required for washing, and improves the washability of the washing mechanism. EXAMPLES

[0020] Fig. 4 is a schematic diagram of a dead-end filter, and Fig. 5 is a schematic diagram of a cross-flow filter. The improvement in cleanability when a cross-flow filter is used in the filter device 11 of the cement solidification apparatus 100 of the present invention will be described with reference to Figs. 4 and 5.

[0021] As shown in Figure 4, in a dead-end filter as the filter 16, the membrane feed water 18 is supplied perpendicularly to the filter membrane surface 16, and the membrane feed water 18 and the membrane filtered water 19 flow in parallel directions. However, with continued use of the filter, suspended solids 17 accumulate on the filter membrane surface 16, decreasing the filtration efficiency. Therefore, to continue using the filter, it is necessary to periodically clean or replace the filter.

[0022] 5, when a cross-flow filter is used as the filter 16, the membrane supply water 18 is supplied in a direction parallel to the filter membrane surface 16, and the membrane supply water 18 and the membrane filtrate water 19 flow in a vertical direction. This makes it possible to continue filtration while suppressing the phenomenon in which suspended solids 17 in the membrane supply water 18 are deposited on the filter membrane surface 16.

[0023] As described above, when a cross-flow filter is used, it is possible to reduce the amount of filtration residue and increase the amount of filtrate, thereby improving the cleaning performance of the cleaning mechanism.

[0024] As described above, according to the present invention, it has been shown that a cement solidification apparatus can be provided that can reduce the amount of waste generated by filtering the liquid waste with a filter and then reusing the filtrate as washing water, thereby increasing the amount of liquid waste loaded into one drum and reducing the number of discarded drums.

[0025] The above-mentioned embodiments and experimental examples have been described to aid in understanding the present invention, and the present invention is not limited to the specific configurations described. For example, it is possible to replace a part of the configuration of the embodiments with a configuration according to the technical common sense of a person skilled in the art, and it is also possible to add a configuration according to the technical common sense of a person skilled in the art to the configuration of the embodiments. In other words, it is possible to delete, replace, or add a part of the configuration of the embodiments and experimental examples in this specification without departing from the technical idea of ​​the invention. [Explanation of symbols]

[0026] 1...cement feeding section, 2...washing nozzle, 3...liquid waste, 4...washing water supply section, 5...kneader, 6...drum (washing tank), 7...moving mechanism, 8...filtration residue supply section, 9...waste supply section, 10...washing water (filtrate) supply section, 11...filter device, 12...spray nozzle, 13...planetary blade, 14...high-speed blade, 15...washing range, 16...filter membrane surface, 17...suspended matter, 18...membrane supply water, 19...membrane filtered water, 20...lifting mechanism, 100...cement solidification device.

Claims

1. A cement solidification apparatus comprising: a filter device that filters solids in liquid waste; a filtration residue supplying unit that supplies the filtration residue separated by the filter device to a washing tank; a cleaning water supplying unit that supplies filtrate that has passed through the filter device to the washing tank as cleaning water; a cement supplying unit that supplies cement to the washing tank; and a kneader that kneads the filtration residue and cement supplied to the washing tank.

2. 2. The cement solidification apparatus according to claim 1, wherein the washing water supply unit has a spray nozzle.

3. 3. The cement solidification apparatus according to claim 1, wherein the filter device comprises a cross-flow filter.

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