JP2529227B2 - Contaminated solids treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to heavy metals such as hexavalent chromium, copper, and cyan, or waste water from semiconductor factories, plating factories, concrete contaminated with waste liquid, stones, and the like. The present invention relates to an apparatus for treating contaminated solids.

[Conventional technology]

Generally, when the ground of a heavy metal factory such as a plating factory or a printing factory is contaminated as described above,
The building's basic concrete (pile, underground beam, floor concrete, etc.) and solid materials such as stones are also contaminated.

This contamination situation may be only on the surface of the solid matter, or may have penetrated to the inside.

Conventionally, such solid materials are used in civil engineering heavy machinery, for example, 30
It is roughly divided into 0 to 500 mm in size, and as it is, it is mixed with an insolubilizing agent and processed by a civil engineering machine.

[Problems to be solved by the invention]

However, when the solid matter is treated by such a method, for example, heavy metals adhering to the surface of concrete can be treated, but heavy metals that have penetrated into concrete can be treated. Instead, it will be left as it is.

Then, from the solid matter treated in this manner, harmful components such as heavy metals may be re-eluted depending on the situation of the disposal site or the environment.

[Object of the Invention]

The present invention has been made to solve such conventional problems, and an object thereof is to provide an apparatus for treating contaminated solid matter which can surely insolubilize contaminated solid matter and which does not deteriorate the working environment. Especially.

[Means for solving problems]

The present invention, a pile contaminated by heavy metals, underground piles, basic concrete such as floor concrete, a solid crushing unit for crushing a polluted solid matter such as stones to a predetermined particle size, and a crushing unit for crushing the solid matter. After mixing the contaminated solid matter with chemicals etc. according to the contaminated solid matter and insolubilizing it, the primary mixing mixer is discharged from the bottom and the primary mixing mixer is provided below the primary mixing mixer to insolubilize it. A secondary mixing mixer that mixes and solidifies the treated and discharged contaminated solids with cement, a liquid chemical tank that stores chemicals and the like for insolubilizing the contaminated solids, and this liquid system Weighing hoppers that connect to the chemical tanks, water tanks that store water, weighing hoppers that connect to this water tank, weighing machines that supply powder and granular chemicals to the primary mixing mixer, and cement Next mixed Miki To the primary mixing mixer, a conveying means for carrying the contaminated solid matter crushed by the solid matter crushing section into the primary mixing mixer, a dust collector provided through a pipe line in the secondary mixing mixer, and a lower portion of the secondary mixing mixer. Equipped with a screw feeder, the solids crushing unit collects contaminated solids from 300 to 5
A crusher for crushing to a size of 00 mm, a belt conveyor for transferring contaminated solids crushed by this crusher, and a magnetic sorting for removing reinforcing bars mixed in contaminated solids arranged above this belt conveyor Machine, and a crusher located downstream of the belt conveyor for crushing to a particle size of 3 mm or less, the primary mixer is a press-fitting lid having a gas vent, a stirring blade, an opening / closing device provided at the bottom, and a metering device. An inlet connected to the hopper and the weighing machine is provided, and the secondary mixing mixer is provided with a stirring blade, an opening / closing device provided at the bottom, and an inlet that communicates with the water tank and the weighing machine. To do.

[Operation of the invention]

In the contaminated solid matter processing apparatus according to the present invention, since the solid matter crushing unit is provided, the contaminated solid matter can be reliably crushed to a predetermined particle size. Further, since the primary mixing mixer for the insolubilization treatment and the secondary mixing mixer for the solidification treatment are provided in the upper and lower two stages, the insolubilization treatment step and the solidification treatment step can be performed separately, and the insolubilization-treated contamination can be performed. Solid matter can be continuously solidified.

Example of Invention

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

1 and 2 show a typical embodiment of the polluted solids treatment apparatus according to the present invention, and FIG. 1 shows basic concrete such as piles, underground beams, and floor concrete polluted with heavy metals. , A solid crushing unit for crushing polluted solids such as stones to a predetermined particle size or less.

In FIG. 1, reference numeral 1 is a crusher equipped with a hopper 2, into which reinforced concrete or the like is charged by a clam shell 3. This concrete with reinforcing bars is obtained by crushing piles, underground beams, floor concrete, etc., and has a size of 300 to 500 mm, for example. This concrete is, for example, 30 to 30 by the crusher 1.
It is crushed into concrete with a particle size of 50 mm. The crusher 1
Jaw crushers are used to reduce noise and vibration.

5 is a crusher 6 for concrete crushed by the crusher 1
A magnetic force sorter 7 for removing the reinforcing bars mixed in the concrete is arranged above the belt conveyer 5. The concrete transferred to the crusher 6 by the belt conveyor 5 is crushed by the crusher 6 to have a particle size of 3 mm or less. As the crusher 6, a jaw crusher, a roller mill or the like is used.

In addition, in the crusher 6, the grain size of concrete is 3 mm.
The reason for crushing is as follows.

That is, in general, when concrete is infiltrated into the insolubilizing solution, the insolubilizing solution permeates up to about 1 to 2 mm from the surface, but an insolubilizing film is chemically generated inside the concrete and does not permeate. Therefore, if it is 1.5mm from one side of the concrete
By infiltrating each one, 3 mm can be treated from both sides, and if the particle size is 3 mm or less, sufficient treatment is possible.

Reference numeral 8 is a belt conveyer for transferring the concrete crushed by the crusher 6 and having a particle size of 3 mm or less to the hopper 15.

In FIG. 2, 13 is a skip elevator, and a skip bucket 14 is rotatably attached. A solid material crushed by the solid material crushing section shown in FIG. 1 is sent to the skip bucket 14 from a hopper 15. A synthetic resin board is stuck inside the hopper 15 in order to reduce the adhesion of contaminated solids. Further, the skip bucket 14 is weighed by the load cell, and when it reaches a certain amount, the loading into the skip bucket 14 is stopped.

A primary mixing mixer 16 is provided with a press-fitting lid 17 on the top, two stirring blades 19 are provided inside the mixer body 18, and an opening / closing device 20 is provided on the bottom. Also, the press fit lid 17 has a gas vent 21
Is provided. Further, the mixer main body 18 is provided with inlets 22 and 23 for introducing a chemical or the like for insolubilization treatment.

A secondary mixing mixer 24 is provided with two stirring blades 26 inside the mixer body 25, and an opening / closing device 27 at the bottom. Further, the mixer main body 25 is provided with an inlet 28 for supplying cement and the like, and a pipe line 29 communicating with the dust collector 30.

Weighing hoppers 33, 34, 35 and weighing machines 36 are connected to the inlets 22, 23 of the primary mixing mixer 16 via pipelines 31, 32.
A liquid medicine tank 38 is connected to the weighing hopper 33 via a pump 37, and a water tank 40 is connected to the weighing hoppers 34 and 35 via a pump 39. Further, a powdery or granular chemical agent is charged into the weighing machine 36, and is supplied by a charging feeder 41.

Further, the inlet 28 of the secondary mixing mixer 23 is provided with a cement feeder 43 for supplying the cement put into the weighing machine 42 and a pipeline.
Pipe line that connects via 44 and communicates with the water tank 40
It is connected to 45 via a pump 49. And the weighing machine 42
Cement elevator 47 is connected to this.

Further, a screw feeder 48 is provided below the secondary mixing mixer 24. And screw feeder
The reference numeral 48 is adapted to discharge the contaminated solid matter, which is solidified via the conveyor belt conveyor 49, to the hopper 50.

Next, the operation of the present embodiment configured as above will be described.

The concrete excavated and dismantled from the basement of the contaminated land is crushed by a civil engineering heavy machine to a transportable size of, for example, 300 to 500 mm. Although this concrete has a reinforcing bar, it is thrown into the hopper 2 as it is by the clam shell 3 shown in FIG. The concrete put into the hopper 2 is made into concrete having a particle size of 30 to 50 mm by the crusher 1 and transferred to the crusher 6 by the belt conveyor 5.
Then, on the belt conveyor 5, the magnetic reinforcement 7 removes the reinforcing steel mixed in the concrete. Contaminated concrete adhered to the reinforcing bars and the like removed by the sorter 7 is immersed in a reducing liquid (ferrous sulfate) tank to be insolubilized. The concrete transferred to the crusher 6 is crushed by the crusher 6 to have a particle size of 3 mm or less, and then transferred to the hopper 15 by the belt conveyor 8. The dust generated in the crusher 1 and the crusher 6 is collected in the dust collector 100 for processing. In addition, concrete pieces with a particle size larger than 3 mm are
It is again charged into the hopper 2 and crushed by the crusher 1 and the crusher 6 to have a particle size of 3 mm or less. The crushed contaminated solid matter is introduced into the hopper 15 via the belt conveyor 8 and the hopper 15
Is loaded into the skip bucket 14 shown in FIG. The skip bucket 14 is weighed by the load cell, and when it reaches a certain amount, the loading into the skip bucket 14 is stopped.

The skip bucket 14 is wound up by the hoisting winch of the skip elevator 13, and the contaminated solid matter is mixed with the primary mixing mixer 16
Be thrown into. After charging, the press-fitting lid 17 is closed and mixing is performed for a predetermined time in the space portion formed by the stirring blade 19 and the press-fitting lid 17.

After that, the liquid medicine supplied from the measuring hopper 33 and the water supplied from the measuring hopper 34 or 35 are introduced from the inlet 22 of the primary mixing mixer 16 via the pipe 31, and are supplied from the weighing machine 36. After a chemical such as powder is introduced from the introduction port 23 of the primary mixing mixer 16 through the pipe 32, the mixture is stirred and mixed for a predetermined time. This mixture is made up of water,
The order and quantity of medicines to be added are set in advance by the CPU. At the time of actual processing, the processing can be performed with high accuracy by modifying the preset conditions.

The pH in the primary mixing mixer 16 may vary depending on the chemicals used, and at this time, a bad odor (ammonia gas, hydrogen sulfide, etc.) is generated. This gas processing is sent to the gas processing device 51 from the gas vent 21 provided in the press-fitting lid 17 and processed.

When the chemical insolubilization treatment of the contaminated solid matter in the primary mixing mixer 16 is completed, the opening / closing mechanism 20 at the bottom is operated to feed it into the secondary mixing mixer 24 provided in the lower part. Further, the cement in the weighing machine 42 is supplied to the secondary mixing mixer 24 via the pipe line 44, and the water in the water tank 40 is supplied to the secondary mixing mixer 24 via the pipe line 45. Then, in the secondary mixing mixer 24, the slump is adjusted to a predetermined value. The amount of cement added can be freely adjusted according to the desired soil bearing capacity. Since cement enters the secondary mixing mixer 24, the pH rises and dust and ammonia gas are generated. Therefore, a dust collector 30 and equipment for gas treatment are provided. Secondary mixing mixer
The contaminated solids in 24 are mixed for a predetermined time, and then discharged to the hopper 50 via the screw feeder 48 and the belt conveyor 49.

As described above, according to the present embodiment, the insolubilization treatment is performed after the contaminated solid matter is pulverized to a predetermined particle size, so that the contaminated solid matter can be reliably insolubilized. Insolubilization of contaminated solids and solidification for reuse as ground can be performed continuously. It can be treated according to the soil properties and concentration of contaminated solids. Since the insolubilization process and the solidification process were combined into a laminated type batch plant, the plant became compact and the material transfer from the primary mixing mixer to the secondary mixing mixer could be performed instantaneously without any other equipment. Since the chemicals, water, cement, auxiliary agents, etc. can be adjusted with a measuring accuracy of around 1%, the plant is highly economical. The stirring and mixing time in the primary mixing mixer, the stirring and mixing time in the secondary mixing mixer, and the input amount and timing of chemicals, water, cement, auxiliary agents, etc. are CP.
Workability is good because it is controlled by U. or,
The operation is a one-man control. Contaminated solids contaminated with multiple heavy metals can be effectively treated. When the insolubilized polluted solid matter is reused as the ground, for example, the ground strength can be designed according to the bearing capacity of the building. It has a large processing capacity of 50 m ³ / H and can be used together with general civil engineering work. Compared with general civil engineering heavy equipment, it has the advantage of becoming a pollution-free plant with less noise, vibration and dust.

Next, an example in which the present invention is applied to the treatment of a solid substance contaminated with hexavalent chromium and copper will be described.

The contaminated solid matter crushed by the solid matter crushing unit is thrown into the hopper 15 by the belt conveyor 8 and then thrown into the skip bucket 14 from the hopper 15. The skip bucket 14 is weighed by the load cell, and when it reaches a certain amount, the skip bucket 14 is stopped from being charged. Then skip bucket
14 rises in the skip elevator 13 and the primary mixing mixer 16
Be thrown into. Then, the press-fitting lid 17 is closed.

Next, the primary mixing mixer 16 is operated to mix for a predetermined time. During this mixing, water, sulfuric acid, and ferrous sulfate, which are adjusted to the properties of the contaminated solid matter, are charged according to the data preset in the CPU. At this time, sulfuric acid is stored in the chemical tank 38,
The ferrous sulfate is supplied to the weighing machine 36. Then, in the primary mixing mixer 16, a strong acid atmosphere is created, so that hydrogen sulfide is generated. This gas is a gas vent provided on the press-fitting lid 17.
It is sucked by a blower from 21 and put in a secondary mixing mixer 24. In the drawing, the gas vent 21 provided in the press-fitting lid 17 is shown.
It is designed to be sent to the gas processing device 51 from the gas processing device 51 for processing, but in this example, instead of the gas processing device 51, it is directly introduced into the secondary mixing mixer 24.

In the primary mixing mixer 16, hexavalent chromium reacts with sulfuric acid and ferrous sulfate and is reduced to trivalent chromium.

Thus, when the insolubilization process in the primary mixing mixer 16 is completed, the primary mixing mixer 16 is provided with the switchgear 20 provided at the bottom thereof.
Is opened and the insolubilized contaminated solid matter is supplied to the secondary mixing mixer 24.

In the secondary mixing mixer 24, the cement is supplied from the weighing machine 42 and the water is supplied from the tank 40. Then, copper is converted into copper hydroxide and fixed. The secondary mixing mixer 24 becomes alkaline because it contains cement. In this, hydrogen sulfide from the primary mixing mixer 16 is supplied and chemically suppressed. Instead, dust and ammonia are generated. Therefore, a dust collector 30 and a water washing facility are provided. After mixing in the secondary mixing mixer 24 for a predetermined time, the opening / closing device 27 provided at the bottom is opened and discharged to the screw feeder 48.

As described above, according to this embodiment, the contaminated solid substance contaminated with hexavalent chromium and copper can be insolubilized at the same time. Insolubilization and solidification for reuse as the ground can be performed continuously. It is possible to process according to the pollution situation (solid state, concentration, etc.). Since the treatment plant is built into a stacking type batcher plant, it is compact and can be reduced and solidified in a closed space and is easy to move. Since sulfuric acid, ferrous sulfate, cement, etc. can be adjusted with high accuracy, it is a highly reliable and economical plant. CP
Since it is controlled by U, adjustment of chemicals, water, etc. can be done easily. It has the advantage of being a pollution-free plant with little noise, vibration, dust, etc.

Further, a specific example of insolubilizing a heavy metal-contaminated solid material to which the present invention is applied will be described.

In the case of contaminated solids containing water-soluble mercury compounds, cadmium compounds and lead compounds, after being charged into the primary mixing mixer 16, sodium sulfide and water are added to produce mercury sulfide, cadmium sulfide and lead sulfide. And can be insolubilized.

Since hydrogen sulfide is generated when sodium sulfide is used, it is necessary to provide a gas vent port in the primary mixing mixer 16 and also a deodorizing facility.

In the secondary mixing mixer 24, cement is added to start the solidification reaction. Here, the hydrogen sulfide odor turns into an ammonia odor.

In the case of a contaminated solid containing an arsenic acid compound, iron arsenate can be generated and insolubilized by adding the iron salt FeCl ₃ and water to the primary mixing mixer 16. In order to prevent the insolubilized iron arsenate from being reduced in the soil, cement is put into the alkaline state in the secondary mixing mixer 24.

Organic sludge containing copper forms a copper-ammonium complex salt that is easily soluble in water during cement treatment. Therefore, copper cannot be insolubilized. Then, when zeolite powder and water are put into the primary mixing mixer 16, ammonia is adsorbed, and copper can be fixed as copper hydroxide by cement in the secondary mixing mixer 24.

FIG. 3 shows another example of the solid material crushing section shown in FIG. 1, and in this example, the particle size of 40 to 40
A solid substance of 50 mm is supplied to the hopper 53 by the belt conveyor 5, and is supplied to the crusher 55 by the apron feeder 54. The solid material crushed to a particle size of 3 to 5 mm by the crusher 55 is sent to the particle size selector 57 by the belt conveyor 56 and the particle size is selected. The solid material having a particle size of 3 mm or less is hoppered by the belt conveyor 58. Sent to 15. On the other hand, the solid matter having a particle size exceeding 3 mm is transferred to the crusher 55 by the belt conveyor 59, and is crushed again there to have a particle size of 3 mm or less. Therefore, it is possible to ensure that the particle diameter of the solid matter is 3 mm or less.

It is also possible to treat contaminated soil with the apparatus of the above-mentioned embodiment. In this case, clam shell
The contaminated soil excavated in 61 is put into a grizzly (sorting machine) 62 arranged in the upper part of the hopper 15, and in the case of gravel, gravel, etc., those having a particle size of a predetermined size or more are sorted. However, viscosity,
In the case of soil such as silt, it is not necessary to pass the grizzly 62.

〔The invention's effect〕

As described above, according to the present invention, the insolubilization treatment is performed after the contaminated solid matter is pulverized into a predetermined particle size, so that the contaminated solid matter can be reliably insolubilized. In addition, after mixing with chemicals etc. according to the contaminated solids to insolubilize it, it mixes with cement etc. and solidifies, so regardless of the properties and concentration of the contaminated solids, the insolubilization treatment of the contaminated solids is performed. And solidification treatment can be performed continuously, and the working environment is not deteriorated. Further, since the primary mixing mixer for insoluble treatment and the secondary mixing mixer for solidification treatment are provided in two stages, upper and lower stages, there is an advantage that it can be set compactly and is easy to handle.

[Brief description of drawings]

FIG. 1 and FIG. 2 are explanatory views showing a typical embodiment of the present invention, and FIG. 3 is an explanatory view showing another example of the solid crushing section. 1 ... Crusher, 2,15,53 ... Hopper, 6,55 ... Crusher, 1
3 …… Skip elevator, 14 …… Skip bucket, 1
6 …… Primary mixing mixer, 17 …… Press-fitting lid, 18 …… Mixer body, 19,26 …… Stirring blade, 20,27 …… Switching device, 21 …… Gas venting, 22,23,28 …… Inlet port , 24 …… Secondary mixing mixer, 3
0,100 …… Dust collector, 33,34,35 …… Weighing hopper, 36,42 ……
Weighing machine.

Claims (1)

(57) [Claims] 1. A solid material crushing unit for crushing polluted solid matter such as piles, underground piles, floor concrete, etc., and contaminated solid matter such as stones, which are contaminated by heavy metals, etc., and crushed by this solid matter crushing unit. The polluted solid matter is mixed with a chemical agent or the like according to the polluted solid matter and subjected to insolubilization treatment, and then the primary mixing mixer (16) is discharged from the bottom, and the primary mixing mixer (16) is provided below the primary mixing mixer (16). Secondary mixing mixer (24) that mixes and discharges the contaminated solids that have been insolubilized and discharged by the primary mixing mixer (16) and the chemicals that insolubilize the contaminated solids are stored. The liquid medicine tank (38), the weighing hopper (33) communicating with the liquid medicine tank (38), the water tank (40) for storing water, and the water tank (40) Weighing hopper (35) to be in contact with, powder, granular medicine The primary mixing mixer (16) to supply weighing machine (36), cement secondary mixing mixer (24) to supply the weighing machine (4
2), a conveying means (13) for carrying the contaminated solid matter crushed by the solid matter crushing section into the primary mixing mixer (16), and the secondary mixing mixer (64) provided via the pipe line (29). A dust collector (30) and a screw feeder (48) provided below the secondary mixing mixer (24) are provided, and the solid crushing unit crushes the contaminated solid into a size of 300 to 500 mm ( 1), a belt conveyor (5) for transferring contaminated solids crushed by the crusher (1), and a reinforcing bar arranged above the belt conveyor (5) to remove rebar mixed in the contaminated solids. A magnetic separator (7) and a pulverizer (6) located downstream of the belt conveyor (5) for pulverizing to a particle size of 3 mm or less are provided, and the primary mixer (16) has a gas vent (21). Press-fitting lid (17), stirring blade (19), and opening / closing device (2
0) and the inlets (22, 23) connected to the weighing hoppers (33, 35) and the weighing machine (36), and the secondary mixing mixer (24) is provided on the stirring blade (26) and the bottom. The polluted solids treatment apparatus, which is provided with an opening / closing device (27) and an inlet (28) that connects the water tank (40) and the weighing machine (42).