KR102573143B1 - Complex polluted soil purification and recycling system with high magnetic separator - Google Patents

Abstract

The present invention includes a magnetic separator for receiving contaminated soil to be purified, selecting and removing metallic materials from the contaminated soil introduced in a magnetic way, and storing and discharging the sorted soil from which metallic materials are removed; A pre-processing unit for inputting the sorted soil separated and discharged from the magnetic separator and sorting the input sorted soil into fine soil with a set particle diameter or less, wet cleaning, and discharging; a sedimentation tank in which the fine soil washed and separated and discharged from the pretreatment unit flows in, causes the fine soil to settle to the bottom by gravity, and discharges floating soil that has not been settled; a flocculation sedimentation tank in which floating soil discharged from the sedimentation tank flows in and a coagulant is introduced to precipitate coagulated sediment from the floating soil to the bottom; A thickening tank connected to the discharge ends of the sedimentation tank and the flocculation sedimentation tank, into which sediments respectively precipitated in the sedimentation tank and flocculation sedimentation tank flow in, storing the sediment to generate gravity-separated concentrated sludge, and discharging the concentrated sludge; a filter press into which the concentrated sludge discharged from the thickening tank is introduced and dehydrated to produce and discharge the concentrated sludge as a dewatering cake; and a solidification treatment device in which the dewatered cake and the solidifying agent discharged from the filter press are introduced, and the dewatered cake and the solidifying agent are transported and stirred, and then discharged as improved soil. It relates to a soil purification and resource recovery treatment system.

Description

Complex polluted soil purification and recycling system with high magnetic separator}

The present invention solidifies and stabilizes the dehydrated cake discharged from the purification treatment process of contaminated soil to produce improved soil, so that waste resources can be recycled for civil and industrial purposes. Complex contaminated soil purification equipped with a high magnetic separator And it relates to a resource recycling system.

Recently, the importance of the soil environment affected by development projects has emerged as the seriousness of soil and groundwater contamination has increased due to wastes and hazardous chemicals generated by population growth and industrial development worldwide.

Heavy metals in soil do not decompose, but are adsorbed, solidified, or re-eluted according to changes in the physicochemical environment, thereby spreading contamination.

When the amount of metal accumulated in the soil increases, it can act as a risk factor that interferes with the enzymatic activity of plants or microorganisms. When metal contaminants are introduced through groundwater, they adversely affect various organisms using groundwater, and when absorbed into plant tissues, they ultimately harm humans through the food chain.

Contamination forms caused by heavy metals can be divided into exchange form, carbonic acid form, form adsorbed to iron oxide or manganese oxide, form bound to organic matter or sulfur, and residual form.

Methods to purify contaminated soil include soil washing and electrokinetic extraction methods. These techniques are difficult to remove heavy metals in the form of organic matter, sulfur-bound form, and residual form. To remove these substances by washing, strong acids with high extractive power must be used. However, the use of strong acid has problems of causing secondary pollution such as corrosion of cleaning equipment, wastewater treatment problems, and acidification of soil.

In addition, when metal components are very strongly bound to soil particles only with conventional soil washing techniques, when the density and surface characteristics of soil containing metal components and soil without metal components are not clearly distinguished, washing due to various chemical characteristics of heavy metals When the technology is difficult to apply, when heavy metals are combined with soil particles of various sizes, when the content of silt/clay exceeds 30-50% or when the content of humic is high, organic matters with high viscosity are incorporated into the soil. There was a problem in that it was difficult to effectively remove contaminants adsorbed to the soil, such as when it was included.

In particular, the conventional soil washing technology has a low purification efficiency when the applied soil contains a large amount of fine soil, which is due to the characteristics of fine soil having a high specific surface area and a large amount of adsorption sites. Since organic and inorganic contaminants are more strongly adsorbed compared to the case, it is difficult to desorb through the purification method, so the installation cost is high in terms of economic feasibility, eco-friendliness, workability, and safety of the purification system, and a lot of site installation for the purification system is secured. There is a problem that should be.

Republic of Korea Patent Registration No. 10-847058

Therefore, the present invention was invented to solve the above problems, and the purification efficiency can be further improved by arranging a plurality of sorting means in conjunction and refining the contaminated soil to be purified through their sequential particle size separation, The purpose is to provide a complex contaminated soil purification and resource recovery system equipped with a high magnetic separator capable of recycling waste resources for civil and industrial purposes by solidifying dewatering cakes separated and discharged from the purification treatment process of contaminated soil.

As a means for solving the above problems, the complex contaminated soil purification and resource recovery treatment system (hereinafter referred to as the "system of the present invention") equipped with the high magnetic separator of the present invention, the contaminated soil to be purified flows in and flows in a magnetic way a magnetic separator that selects and removes metallic materials from contaminated soil and stores and discharges the sorted soil from which metallic materials are removed; A pre-processing unit for inputting the sorted soil separated and discharged from the magnetic separator and sorting the input sorted soil into fine soil with a set particle diameter or less, wet cleaning, and discharging; a sedimentation tank in which the fine soil washed and separated and discharged from the pretreatment unit flows in, causes the fine soil to settle to the bottom by gravity, and discharges floating soil that has not been settled; a flocculation sedimentation tank in which floating soil discharged from the sedimentation tank flows in and a coagulant is introduced to precipitate coagulated sediment from the floating soil to the bottom; A thickening tank connected to the discharge ends of the sedimentation tank and the flocculation sedimentation tank, into which sediments respectively precipitated in the sedimentation tank and flocculation sedimentation tank flow in, storing the sediment to generate gravity-separated concentrated sludge, and discharging the concentrated sludge; a filter press into which the concentrated sludge discharged from the thickening tank is introduced and dehydrated to produce and discharge the concentrated sludge as a dewatering cake; and a solidification treatment device for introducing the dehydrated cake and the solidifying agent discharged from the filter press, transporting the dehydrated cake and the solidifying agent, stirring them, and discharging them into the improved soil, wherein the solidification processing device accommodates the solidifying agent and An input hopper for selectively discharging the received solidifying agent, a dewatering cake discharged from the filter press and a solidifying agent discharged from the input hopper, respectively, and a supply screw for transporting and discharging the introduced dehydration cake and solidifying agent in one direction, , A mixing feed screw for discharging the dewatering cake and the solidifying agent discharged from the supply screw and mixing the introduced dewatering cake and the solidifying agent while transporting them in one direction and discharging them, wherein the mixing feed screw has a screw built into the top surface Composed of a first body with an opening and an outlet formed on one lower surface of the body, and a second body with an inlet formed on one upper surface in a shape covering the opening and a space formed therein so that the upper and lower surfaces are mixed. The mixing and conveying screw includes a first mixing and conveying screw for first mixing the dehydrated cake and the solidifying agent discharged from the supply screw and transporting and discharging the dehydrated cake and the solidifying agent in one direction while first mixing them; A second mixing and conveying screw installed on the discharge side of the mixing and conveying screw, in which the mixture discharged from the first mixing and conveying screw is introduced and secondly mixed with the introduced mixture and transported in one direction and discharged, wherein the first mixing and conveying screw and The second mixing and conveying screw is installed to form an upward gradient from the inlet to the outlet, and the second body is characterized in that one or more downward guide plates having elastic restoring force from the upper end to the lower end are configured.

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As an example, the inlet of the first mixed feed screw is installed in a direction orthogonal to the outlet of the supply screw while facing, and the inlet of the second mixed feed screw faces the outlet of the first mixed feed screw and is orthogonal to the outlet of the first mixed feed screw. It is characterized by being installed in the direction of

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As an example, a downward slope is formed at the discharge port of the second mixing feed screw, and a plurality of scattering guide plates are formed so that a flow path is formed to fall downward from the end, and the scattering guide plate is formed on the rear surface of the second mixing guide plate. It is characterized in that the anti-scattering tube in which the adsorption sheet is configured is configured.

As an example, the preprocessing unit includes a crusher for inputting the sorted soil discharged from the magnetic separator, pulverizing and discharging the sorted soil, and sorting the soil discharged from the grinder, entering the sorted soil and spraying washing water to supply the sorted soil. A first wet sorting device that separates and discharges soil of the first particle size or less from the sorting soil while washing the soil, and the soil of the first particle size or less that is separated and discharged from the first wet screening device flows in, and the relatively larger than the first particle size It is characterized in that it includes a first cyclone that selects and separates and discharges fine soil of the second small particle size or smaller.

As an example, the pretreatment unit is provided at the rear end of the first cyclone, and fine soil having a size of a second particle size or less that is separated and discharged from the first cyclone flows in, and a particle size of a second particle size or less introduced by spraying washing water A second wet sorting device for sorting and separating and discharging fine soil smaller than the third particle size relatively smaller than the second particle size while washing the fine soil, and provided between the rear end of the second wet separator and the front end of the grit bath, The fine soil of the third particle size or less, which is separated and discharged from the second wet separator, is introduced, and the fine soil of the fourth particle size or less, which is relatively smaller than the third particle size, is separated, discharged, and introduced into the grit chamber. It is characterized by further including a cyclone.

As described above, according to the system of the present invention, purification efficiency is further improved by arranging a plurality of sorting means as a pretreatment process and separation of metallic materials prior to the precipitation treatment process, and refining the contaminated soil to be purified through their sequential particle size separation. It has the effect of solving environmental problems by controlling the excessive use of oxidizing agents.

In particular, the system of the present invention can solve environmental problems by solidifying and stabilizing the dehydrated cake that is dehydrated and separated and discharged in the purification treatment process of contaminated soil to produce improved soil so that discarded resources can be recycled for civil engineering and industrial purposes. Of course, it has the effect of improving economic efficiency.

1 is a block diagram showing the configuration of a system according to an embodiment of the present invention;
2 is a plan view showing the configuration of a solidification processing apparatus according to an embodiment of the present invention.
3 is a side view showing the configuration of a solidification processing apparatus according to an embodiment of the present invention;
Figure 4 is an exploded view of the mixing feed screw as one configuration of the present invention.
5 is an operating state diagram of the mixing feed screw shown in FIG. 4;
Figure 6 is a cross-sectional side view showing an embodiment of the mixing feed screw.
Figure 7 is a front view of the mixing transfer screw shown in Figure 6;
8 is a side cross-sectional view showing an example in which a scattering prevention pipe is configured in a second mixing feed screw;

In describing the present invention, the terms or words used in this specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to best describe his or her invention. should be interpreted as a meaning and concept that corresponds to the technical idea of

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, the system of the present invention includes a magnetic separator 1 that preemptively selects metallic substances from contaminated soil to be purified, and cleaning while sorting the sorted soil separated and discharged from the magnetic separator 1 by particle size. a pretreatment unit 2 for pretreatment, a sedimentation tank 3 and a flocculation sedimentation tank 4 for precipitating and purifying the fine soil treated in the pretreatment unit 2, and the sedimentation tank 3 and the flocculation sedimentation tank 4 A thickening tank (5) for concentrating the precipitate generated in the treatment process and discharging it as concentrated sludge, a filter press (7) for dehydrating the concentrated sludge discharged from the thickening tank (5), and dehydration of the filter press (7) It is configured to include a solidification treatment device 8 for producing improved soil by solidifying the cake.

The magnetic separator 1 receives contaminated soil to be purified, selects and removes metallic materials such as iron oxide from the contaminated soil by magnetic force, and stores and discharges the sorted soil from which metallic materials are removed.

The metallic material that is sorted and separated in the magnetic separator 1 can be recycled through a separate storage and treatment process.

Since the magnetic separation structure and operating mechanism of the magnetic separator 1 can be implemented in various ways from known technologies, detailed description thereof will be omitted.

In the preprocessing unit 2, the sorted soil separated and discharged from the magnetic separator 1 is input, and the input sorted soil is sorted into fine soil with a set particle diameter or less and discharged after wet cleaning.

Specifically, as shown in FIG. 1 , the pretreatment unit 2 may include a grinder 10, a first wet sorting device 20, and a first cyclone 30.

The crusher 10 inputs sorted soil stored and discharged in the magnetic separator 1, and pulverizes and discharges the contaminated soil to a certain size so that the later sorting process can be facilitated.

Since the crushing structure and operating mechanism of the crusher 10 can be implemented in various ways from known technologies, a detailed description thereof will be omitted.

The first wet sorting device 20 is connected to the rear end of the crusher 10, and sorted soil that is pulverized and discharged in the crusher 10 is introduced. Although not shown in the drawing, the first wet sorting device 20 is equipped with at least one sorting net and applies vibration to the sorting net to separate and sort the sorting soil into a set grain size based on the size of a set specific grain size. In addition, the sorted soil is washed and discharged.

That is, the first wet sorting device 20 is provided with a plurality of spray nozzles inside, and washing water is sprayed at the same time as the sorting soil is introduced or with a time difference to wash the supplied sorted soil, and the sorted soil is smaller than the first particle size. Soil is selected and separated and discharged.

At this time, the first particle size may be 2 to 3 mm, and the soil having a first particle size or larger may be separated and discharged as washed soil and subjected to a separate treatment process.

In addition, the washing water sprayed from the first wet separator 20 may be supplied from the washing water tank 6 described below.

The first cyclone 30 receives soil of a first particle size or less that is separated and discharged from the first wet separator 20, and selects fine soil of a second particle size or less that is relatively smaller than the first particle size. separate discharge.

The first cyclone 30 performs a particle size separation process by a difference in specific gravity in the introduced soil, and since various known technologies can be applied to the structure and operation mechanism of the first cyclone 30, detailed description thereof is omitted.

On the other hand, the pretreatment unit 2 of the present invention repeatedly performs particle size separation on the sorted soil discharged from the magnetic separator 1 to further refine the soil, thereby doubling the purification efficiency. ) and a second cyclone 50 may be further included.

The second wet separator 40 and the second cyclone 50 are provided at the rear end of the first cyclone 30 and the front end of the grit tub 3, and have a size of the second particle size discharged from the first cyclone 30. The following fine soil is again separated in particle size and supplied to the settling tank 3.

First, the second wet sorting device 40 is provided at the rear end of the first cyclone 30, and fine earth sand of the second particle size or smaller that is separated and discharged from the first cyclone 30 flows in, and washing water is sprayed. While washing the introduced fine soil of the second particle size or less, the fine soil of the third particle size or less, which is relatively smaller than the second particle size, is separated and discharged.

The second wet sorting device 40 may have the same sorting structure as the first wet sorting device 20 described above, except that the particle size of the soil to be sorted is smaller than the third particle size smaller than the second particle size. The process of selecting the fine soil of

At this time, the third particle size may be 07 to 08 mm, and soil having a third particle size or larger may be separated and discharged as washed soil and subjected to a separate treatment process. In addition, the washing water sprayed from the second wet sorting device 40 may also be supplied from the washing water tank 6 described below.

The second cyclone 50 is provided between the rear end of the second wet separator 40 and the front end of the grit tub 3, and is smaller than the third particle size separated and discharged from the second wet separator 40. of fine soil is introduced, and fine soil smaller than the fourth particle size, which is relatively smaller than the third particle size, is selected, separated and discharged, and introduced into the grit chamber 3.

The second cyclone 50 performs a particle size separation process by a difference in specific gravity in the inflowed soil, and since various known technologies can be applied to the structure and operation mechanism of the second cyclone 50, a detailed description thereof is omitted.

As such, in the pretreatment unit 2 of the present invention, the first wet separator 20, the first cyclone 30, the second wet separator 40, and the second cyclone 40 are linked and arranged sequentially. By further miniaturizing the soil introduced through phosphorus particle size separation, removal of heavy metals, etc., adsorbed to soil with a relatively small surface area, is possible without the addition of a separate oxidizing agent, and thus the purification efficiency can be further improved while being environmentally friendly.

On the other hand, as one configuration for purifying the fine soil selected in the pretreatment unit 2, the sand sand tank 3 separates and discharges the fine soil from the first cyclone 30, that is, fine soil with a second particle size or less The washing water used in the first wet sorting device 20 etc. is introduced, and the retention treatment is performed for a predetermined time so that the fine soil settles to the bottom by gravity and is separated from the washing water.

In addition, in the sedimentation tank 3, the fine soil precipitated through the above process and the floating soil that has not been precipitated are separated and discharged. In the case of the precipitated fine soil, it is supplied to the concentration tank 5 described below, and is not precipitated. In the case of floating soil that has not been released, that is, ultra-fine soil having a relatively smaller specific gravity or particle size, it is supplied to the coagulation sedimentation tank 4 for post-treatment.

In the flocculation sedimentation tank 4, the floating soil and supernatant water discharged from the sedimentation tank 3 are introduced together, and a flocculant is introduced from the outside, and the sediment coagulated by the coagulant from the floating soil is treated for a predetermined time. to precipitate into

Here, the coagulant may be an inorganic electrolyte or an organic polymer compound as a material that causes solid particles suspended in a liquid to coagulate and settle with each other, but the present invention is not limited thereto, and a suitable one can be selected and used It is natural that you can

In addition, the agglomeration tank 4 can accommodate a certain amount of treated water for sedimentation treatment of the inflow floating soil. It could be that water is getting in.

Like the sedimentation tank 3, the sediment treated in the coagulation and settling tank 4 flows into the thickening tank 5 connected to the rear end, is concentrated in the thickening tank 5, and can be discharged as concentrated sludge.

In addition, in the coagulation settling tank 4, treated water from which sediment and suspended matter are filtered out is generated during the coagulation settling process. This treated water can be discharged through a treated water discharge line separately provided in the coagulation settling tank 4, and the discharged treatment In the case of water, it may flow into and be stored in the washing water tank 6 provided at the rear end of the flocculation and settling tank 4. In addition, the treated water stored in the washing water tank 6 is supplied to the first wet separator 20 and the second wet separator 40 so that it can be used as washing water.

The thickening tank 5 is connected to the discharge ends of the sedimentation tank 3 and the flocculation sedimentation tank 4, so that fine soil and sediment precipitated in the sedimentation tank 3 and the flocculation sedimentation tank 4 flow in, and the sediment is stored therein. to produce gravity-separated concentrated sludge, and the produced concentrated sludge is discharged.

The filter press 7 is connected to the rear end of the thickening tank 5, and the concentrated sludge discharged from the thickening tank 5 is introduced.

The filter press 7 applies a pneumatic or hydraulic press method to compress the inflowed concentrated sludge, and through this dehydration treatment, it is produced and discharged as a dewatered cake.

On the other hand, the solidification processing device 8 introduces the dehydrated cake and the solidifying agent discharged from the filter press 7, transports and stirs the dehydrated cake and the solidifying agent, and discharges them into the improved soil, so that the improved soil is filled with landfill and landfill facilities. It can be recycled as various functional construction soils such as covering soil, backfilling, and embankment.

As shown in FIG. 2 , the solidification processing device 8 may include an input hopper 70 , a supply screw 80 and a mixing transfer screw 90 .

The input hopper 70 has an inner space accommodating the solidifying agent, and is provided with an outlet through which the solidifying agent accommodated in the inner space is discharged.

In addition, although not shown in the drawings, the outlet may be provided with an electronic opening and closing valve, and the discharge amount of the solidifying agent selectively accommodated may be controlled in consideration of the input amount of the dehydrated cake and the degree of solidification according to the purpose of use of the improved soil. this is preferable

In addition, the input hopper 70 may further include a transfer screw 71 for inputting the solidifying agent discharged through the outlet into the supply screw 80 while stirring.

The conveying screw 71 has one end communicated with the discharge port of the input hopper 70 so that the discharged solidifying agent flows in and the other end communicates with a selected position of the supply screw 80 to stir some of the solidifying agent aggregated between particles. and dispersed so that the particles of the solidifying agent can flow into the supply screw 80 in a uniform state.

The supply screw 80 receives the dewatered cake discharged from the filter press 6 and the solidifying agent discharged from the input hopper 70, respectively, and transports the introduced dewatered cake and the solidifying agent in one direction and discharges them.

Further, the supply screw 80 pulverizes the solidified dewatering cake and the solidifying agent so that the dewatering cake and the solidifying agent are discharged in a mixed state.

The mixing and conveying screw 90 introduces the dewatering cake and the solidifying agent discharged from the supply screw 80, and transfers the introduced dewatering cake and the solidifying agent in one direction while mixing and discharging them. The mixing transfer screw 90 allows the pulverized dehydrated cake and the solidifying agent to be mixed in the process of transporting the dehydrated cake to solidify and stabilize the dehydrated cake, thereby producing improved soil that can be recycled.

The mixing transfer screw 90 according to a preferred embodiment of the present invention may have a structure that ensures sufficient time until the dewatering cake is stabilized into the improved soil.

For example, as shown in FIG. 3, the mixing and conveying screw 90 introduces the dehydrated cake and the solidifying agent discharged from the supply screw 80, and first mixes the introduced dehydrated cake and the solidifying agent and transfers them in one direction. A first mixing and conveying screw 91 is installed on the discharge side of the first mixing and conveying screw 91, and the mixture discharged from the first mixing and conveying screw 91 is introduced, and the introduced mixture is mixed in one direction while secondary mixing. It may include a second mixing transfer screw 92 that is transferred to and discharged.

That is, the solidification processing apparatus 8 according to the present embodiment has a structure in which at least two or more mixing and conveying screws 90 are connected, so that a sufficient movement time is provided until the mixture is solidified and stabilized by reaction with the solidifying agent. It will be.

And the first mixed feed screw 91 and the second mixed feed screw 92 are accommodated inside the casing as shown in the drawing, and the inlets 912-2 and 922-2 and the outlet 911-2 , 921-2) is opened to prevent the mixed and transferred mixtures from scattering to the outside.

In particular, the first mixed feed screw 91 and the second mixed feed screw 91 form an upward gradient from the inlets 912-2 and 922-2 toward the outlets 911-2 and 921-2. It is installed to delay the movement time of the mixture as much as possible so that solidification and stabilization can proceed more effectively.

In addition, in this embodiment, as shown in FIG. 2, the inlet 912-2 of the first mixing feed screw 91 is installed in a direction perpendicular to the outlet 801 of the supply screw 80 while facing, , The inlet 922-2 of the second mixed feed screw 92 may be installed in a direction orthogonal to the outlet 911-2 of the first mixed feed screw 91 while facing each other.

In other words, the supply screw 80, the first mixed feed screw 91, and the second mixed feed screw 92 are interconnected to have a "c"-shaped arrangement structure, thereby minimizing the installation space. Compared to the linked arrangement structure, it can be installed in a narrow space.

In particular, in the present invention, the first and second mixing and conveying screws 91 and 92 have screws 913 built in, openings 911-1 and 921-1 are formed on the upper surfaces, and discharge ports 911 are formed on the lower surfaces of one end. -2 and 921-2 are formed on the first bodies 911 and 912 and the inlets 912-2 and 922-2 are formed on one upper surface in a shape covering the openings 911-1 and 921-1 It is characterized in that it is composed of the second bodies 912 and 922 formed and space portions 912-1 and 922-1 are formed therein so that up and down mixing is achieved.

Since the first and second mixing feed screws 91 and 92 have the same structure and operation mechanism, only the first mixing feed screw 91 will be described below for convenience of description.

As shown in FIGS. 4 and 5, the first mixed feed screw 91 is composed of a first body 911 and a second body 912, and the first body 911 has a screw 913 embedded therein. It is characterized in that the opening 911-1 is formed on the upper surface and the outlet 911-2 is formed on the lower surface of one end.

Forming the opening 911-1 in the first body 91 is to control that the mixture is strongly coagulated by pressurization so that the mixture is not discharged from the outlet 911-2 and the screw 913 is idle. It is for That is, the pressure of the mixture pressurized by the rotation of the screw 913 is released from the opening 911-1 so that the mixture is smoothly discharged from the outlet 911-2.

The second body 912 is configured to cover the opening 911-1, and has an inlet 912-2 formed on one upper surface and a space 912-1 formed therein.

The mixture introduced from the inlet 912-2 falls into the first body 911 and flows to the other end by the rotation of the screw 913. As the mixture continues to flow in, the space 912-1 Edo mixture is filled.

In this case, as shown in FIG. 5, in the first body 91, the mixture flows in the direction of the outlet 911-2, and in the second body 912, the first body 911 flows to the space formed by the mixture. A flow in which the mixture descends due to its own weight is formed. As shown in the drawing, the descending flow is a flow in a counterclockwise direction according to the formation of an upward gradient as a whole.

Also, in this process, the mixture flowing in the first body 911 flows upward through the opening 911-1 to the space 912-1 where the pressure is released. As the second body 912 is formed in this way, the mixture is easily mixed up and down, and by this operating mechanism, the first mixing and conveying screw 91 ensures a sufficient mixing time at the same length.

As in the prior art, if only the first body 911 is formed in the first mixing and conveying screw 91, the mixture inherent in any pitch in the screw 913 can be discharged to the outlet 911-2 while flowing as it is. However, in this case, there is a problem that sufficient mixing efficiency cannot be expected.

Accordingly, in the present invention, the first body 911 is further configured to communicate with the second body 912 so that, as mentioned above, the mixing efficiency of the dehydrated cake and the solidifying agent is improved by enabling the upper and lower interlocking between the mixtures. it will rise even higher.

In addition, in the present invention, embodiments for further increasing the mixing efficiency are presented in FIGS. 6 and 7 .

In this embodiment, an example in which one or more downward guide plates 914 having an elastic restoring force in the direction from the upper end to the lower end is configured in the second body 912 is presented.

As mentioned above, in the first body 911, the mixture flows in the direction of the outlet 911-2 by the rotation of the screw 913, and by this flow, the mixture also flows in the second body 912 to the outlet 911-2. Some flow is formed in the (911-2) direction.

In this process, the downward guide plate 914 is bent by elasticity, and as mentioned above, the mixture of the second body 912 flows downward in the direction of the first body 911 during the flow process. When the pressing force is released from the down guide plate 914, a restoring force is generated so that the restoring force is added to the force flowing downward of the mixture in the second body 912.

That is, the mixing efficiency is further doubled. In addition, the behavior of the downward guiding plate 914 due to such elasticity and restoring force disturbs the mixture in the second body 912, so that the mixture in the first body 911 and the mixture in the second body 912 have an up-and-down mixing efficiency. will raise the

The downward guide plate 914 has an elastic restoring force, and a material having an elastic restoring force can be used as the material itself. It may be configured so that one end of the plate portion of the smooth surface is attached to the portion.

In addition to this, in the embodiment of the present invention, in the second body 912, the transverse mixing rod 915-1 orthogonal to the longitudinal direction and the wing 913- of the screw 913 in the transverse mixing rod 915-1 2) An example of a further configuration of the mixing ball 915 composed of the mixed rods 915-2 protruding to be located between the pitches is presented.

The mixing ball 915 is formed to connect between the side walls of the second body 912 in a "T" shape and is formed downward from the horizontal mixing bar 915-1 and the second mixing bar 915-1. It is composed of a species-mixed rod 915-2 protruding into and positioned between the pitches of the wings 913-2 of the screw 913.

As mentioned above, the transverse mixing rod 915-1 disturbs the mixture flowing in the space 912-1 of the second body 912 up and down, so that the mixture in the second body 912 It is a configuration to increase the mixing efficiency of, and the longitudinal mixing rod 915-2 is positioned between the pitches of the wings 913-2 of the screw 913, and the wing 913 of the screw 913 by the rotation of the screw 913 -2) This corresponds to a configuration in which the mixing efficiency of the mixture is increased in the first body 911 by controlling the flow of the mixture formed between the pitches.

In particular, due to the configuration of the species mixture rod 915-2, a strongly cohesive mixture that can be deposited between the pitches of the wings 913-2 of the screw 913 and cause a pinch hits the species mixture rod 915-2 It is to be broken while being broken so that the above-mentioned mixing action can be easily achieved.

In addition, in the present invention, as shown in FIG. 8, an embodiment in which scattering is prevented when the modified soil is discharged from the outlet 921-2 of the second mixing and conveying screw 92 is further proposed.

In this embodiment, it is characterized in that the scattering prevention pipe 93 is configured at the outlet 921-2 of the second mixing feed screw 92, and the scattering prevention pipe 93 has a downward slope inside. It is characterized in that a plurality of scattering guide plates 931 are formed to form a flow path 934 to fall downward at the end, and a scattering absorption sheet 932 is formed on the rear surface of the scattering guide plate 931.

As shown in the drawing, the scattering guide plates 931 are configured in a zigzag pattern so as to form a downward gradient, and the modified soil S1 discharged from the outlet 921-2 travels downward along the scattering guide plates 931. As it slides, the process of falling to the scattering guide plate 931 located at the bottom through the flow path 934 is repeated so that it is discharged to the outside.

That is, due to the configuration of the scattering guide plate 931, the modified soil S1 falls, hits the scattering guide plate 931, and slides downward. In this process, scattering S2 occurs, and the scattering S2 generated in this way It is collected on the rear part of the scattering guide plate 931 located at the top.

In this way, the scattering (S2) collected on the rear surface of the scattering guide plate 931 is to be adsorbed on the scattering absorption sheet 932 constituted on the rear surface of the scattering guide plate 931.

By the above-described operating mechanism, scattering mixed in the modified soil is discharged to the outside in a state in which it is removed, so that good quality modified soil is supplied and the scattering discharged to the outside to cause contamination is controlled.

Here, various known materials may be used for the scattering absorption sheet 932, and for example, non-woven fabric may be applied.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also made according to the present invention. falls within the scope of the rights of

1: pre-processing unit 2: magnetic separator
3: sedimentation tank 4: coagulation sedimentation tank
5: thickening tank 6: washing water tank
7: filter press 8: solidification treatment device
10: grinder 20: first wet sorting device
30: 1st cyclone 40: 2nd wet sorting device
50: second cyclone 70: input hopper
71: transfer screw 80: supply screw
90: mixed feed screw 91: first mixed feed screw
92: 2nd mixing transfer screw

Claims (11)

A magnetic separator that receives contaminated soil to be purified, selects and removes metallic substances from the contaminated soil introduced in a magnetic way, and stores and discharges the sorted soil from which metallic substances are removed;
A pre-processing unit for inputting the sorted soil separated and discharged from the magnetic separator and sorting the input sorted soil into fine soil with a set particle diameter or less, wet cleaning, and discharging;
a sedimentation tank in which the fine soil washed and separated and discharged from the pretreatment unit flows in, causes the fine soil to settle to the bottom by gravity, and discharges floating soil that has not been settled;
a flocculation sedimentation tank in which floating soil discharged from the sedimentation tank flows in and a coagulant is introduced to precipitate coagulated sediment from the floating soil to the bottom;
A thickening tank connected to the discharge ends of the sedimentation tank and the flocculation sedimentation tank, into which sediments respectively precipitated in the sedimentation tank and flocculation sedimentation tank flow in, storing the sediment to generate gravity-separated concentrated sludge, and discharging the concentrated sludge;
a filter press into which the concentrated sludge discharged from the thickening tank is introduced and dehydrated to produce and discharge the concentrated sludge as a dewatering cake; and
A solidification treatment device in which the dewatered cake and the solidifying agent discharged from the filter press are introduced and the dehydrated cake and the solidifying agent are transported and stirred and discharged as improved soil;
The solidification processing device,
An input hopper for accommodating the solidifying agent and selectively discharging the received solidifying agent, and a dewatering cake discharged from the filter press and a solidifying agent discharged from the input hopper are respectively introduced, and the introduced dehydration cake and the solidifying agent are transported in one direction. Including a supply screw for discharging, and a mixing transfer screw for conveying and discharging in one direction while mixing the dewatering cake and the solidifying agent discharged from the supply screw and mixing the introduced dehydration cake and the solidifying agent,
The mixing transfer screw,
A first body in which a screw is incorporated, an opening is formed on the upper surface, and an outlet is formed on the lower surface of one end, and an inlet is formed on the upper surface of one end in a shape covering the opening, and a space is formed therein so that up and down mixing is achieved. It consists of a second body that
The mixing transfer screw,
A first mixing transfer screw for first mixing the dewatering cake and the solidifying agent discharged from the supply screw and transporting the dewatering cake and the solidifying agent in one direction and discharging them, and installed on the discharge side of the first mixing transfer screw and a second mixing and conveying screw for introducing the mixture discharged from the first mixing and conveying screw, and transporting and discharging in one direction while secondary mixing of the introduced mixture,
The first mixed feed screw and the second mixed feed screw are installed such that an upward gradient is formed from the inlet toward the outlet,
In the second body,
A complex contaminated soil purification and recycling treatment system equipped with a high magnetic separator, characterized in that one or more downward guide plates having elastic restoring force are configured from the top to the bottom.
delete delete delete delete According to claim 1,
The inlet of the first mixed feed screw is installed in a direction orthogonal to the outlet of the supply screw, and the inlet of the second mixed feed screw is installed in a direction orthogonal to the outlet of the first mixed feed screw while facing Complex contaminated soil purification and resource recovery treatment system equipped with a high magnetic separator, characterized in that.
delete delete According to claim 1,
A downward slope is formed inside the discharge port of the second mixing transfer screw, and a plurality of scattering guide plates are formed so that a flow path is formed to fall downward at the end, and a scattering absorption sheet is formed on the back surface of the scattering guide plate. A complex contaminated soil purification and recycling treatment system equipped with a high magnetic separator, characterized in that the scattering prevention pipe is configured.
According to claim 1,
The pre-processing unit,
A crusher for inputting the sorted soil discharged from the magnetic separator and pulverizing and discharging the sorted soil, and a first particle size in the sorted soil while the sorted soil discharged from the grinder is introduced and washing water is sprayed to wash the supplied sorted soil A first wet sorting device that sorts and separates and discharges soils smaller than the size of the first wet sorting device, and soils of the first particle size or less that are separated and discharged from the first wet separator are introduced, and fine particles of a second particle size or less that are relatively smaller than the first particle size A complex contaminated soil purification and recycling treatment system equipped with a high magnetic separator, characterized in that it includes a first cyclone that selects and separates and discharges soil.
According to claim 10,
The pre-processing unit,
It is provided at the rear end of the first cyclone, and fine soil having a size of a second particle size or less, which is separated and discharged from the first cyclone, flows in, and washing water is sprayed to wash the introduced fine soil of a size of a second particle size or less while washing the fine soil of a particle size smaller than the second particle size. A second wet sorting device that sorts and separates and discharges fine soil of a relatively small third particle size or less, and is provided between the rear end of the second wet sorting device and the front end of the sand bath and separated and discharged from the second wet sorting device A second cyclone that selects and separates and discharges fine soil that is smaller than the third particle size and flows into the fine soil that is smaller than the fourth particle size that is relatively smaller than the third particle size, and allows it to flow into the grit tank. A complex contaminated soil purification and resource recovery treatment system equipped with a high magnetic separator.

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