KR102598135B1 - Chlorine bypass dust recycling system for reproducing chlorine bypass dust - Google Patents

Abstract

The present invention relates to a recycling system for chlorine bypass dust, which includes a mixing section that stirs chlorine bypass dust and water to produce a first mixed solution containing calcium, potassium, chlorine, and heavy metals; a remover supply unit that supplies a heavy metal remover that leaches the heavy metal in the first mixed solution to the mixing unit; a coagulant supply unit that supplies a coagulant to coagulate the heavy metals leached from the first mixed solution to the mixing unit; a first filtering unit connected to the mixing unit and generating a second mixed liquid by filtering the aggregates in which the heavy metals contained in the first mixed liquid are aggregated; a first mineralization unit that supplies carbon dioxide to the second mixed solution to mineralize the calcium contained in the second mixed solution into a first precipitate in the form of carbonate; a second filtering unit connected to the first mineralization unit and generating a third mixed liquid by filtering the first precipitate contained in the second mixed liquid; and a cement regeneration unit that mixes the first precipitate with cement raw materials to produce cement, wherein the first mineralization unit includes a second stirring tank having a receiving space therein for accommodating the second mixed solution; a second supply line supplying carbon dioxide into the second stirring tank; and a second stirring unit installed in the second stirring tank and stirring the second mixed liquid and carbon dioxide, wherein the second supply line is connected to the second stirring unit, and the second stirring unit is connected to the second stirring unit. Carbon dioxide can be supplied into the second stirring tank.

Description

Recycling system for chlorine bypass dust {Chlorine bypass dust recycling system for reproducing chlorine bypass dust}

The present invention relates to a recycling system for chlorine bypass dust, and more specifically, to a recycling system for chlorine bypass dust that can obtain potassium chloride crystals, which are raw materials for cement and fertilizer, from chlorine bypass dust.

Recently, awareness of the need for environmental protection has been spreading. Amid this awareness, technology development activities to recycle resources are also increasing. Recycling technology so far has focused on items discarded as household waste, such as paper, plastic, and aluminum cans.

Meanwhile, waste from industrial sites often contains various useful resources. For example, chlorine bypass dust generated in the cement production process contains a significant amount of resources essential to the industry, such as potassium chloride, but is currently being disposed of.

However, in the case of industrial waste, there is a problem in that processing costs increase as advanced reprocessing technology is required during the recycling process. Accordingly, there has been a tendency to avoid reprocessing industrial waste, and landfill methods, which are simpler than reprocessing industrial waste, are being adopted, causing the problem of environmental pollution. Accordingly, research and development to extract industrially necessary resources from chlorine bypass dust is currently in progress.

Korean Patent Registration No. 10-2275438 (2021.07.05.)

The problem to be solved by the present invention is to provide a recycling system for chlorine bypass dust, which is an industrial waste, and recycles chlorine bypass dust into cement raw materials and potassium chloride crystals.

Another object of the present invention is to provide a chlorine bypass dust that can minimize carbon dioxide emissions in the cement manufacturing process by supplying carbon dioxide generated in the cement manufacturing process to the mixed solution in which the chlorine bypass dust is stirred to obtain sediment used as a cement raw material. To provide a recycling system.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

The recycling system for chlorine bypass dust according to the present invention includes a mixing unit that stirs chlorine bypass dust and water to produce a first mixed solution containing calcium, potassium, chlorine, and heavy metals; a remover supply unit supplying a heavy metal remover that leaches the heavy metal in the first mixed solution to the mixing unit; a coagulant supply unit that supplies a coagulant to coagulate the heavy metals leached from the first mixed solution to the mixing unit; a first filtering unit connected to the mixing unit and generating a second mixed liquid by filtering the aggregates in which the heavy metals contained in the first mixed liquid are aggregated; a first mineralization unit that supplies carbon dioxide to the second mixed solution to mineralize the calcium contained in the second mixed solution into a first precipitate in the form of carbonate; a second filtering unit connected to the first mineralization unit and generating a third mixed liquid by filtering the first precipitate contained in the second mixed liquid; and a cement regeneration unit that mixes the first precipitate with cement raw materials to produce cement, wherein the first mineralization unit includes a second stirring tank having a receiving space therein for accommodating the second mixed solution; a second supply line supplying carbon dioxide into the second stirring tank; and a second stirring unit installed in the second stirring tank and stirring the second mixed liquid and carbon dioxide, wherein the second supply line is connected to the second stirring unit, and the second stirring unit is connected to the second stirring unit. Carbon dioxide can be supplied into the second stirring tank.

Specific details of other embodiments are included in the detailed description and drawings.

According to embodiments of the present invention, environmental pollution and resource waste can be minimized by recycling chlorine bypass dust, which is an industrial waste, into cement raw materials and potassium chloride crystals.

Carbon dioxide emissions from the cement manufacturing process can be minimized by supplying carbon dioxide generated in the cement manufacturing process to the mixed solution mixed with chlorine bypass dust to obtain sediment used as a cement raw material.

Cement can be produced by mixing chlorine bypass dust with cement raw materials without undergoing a separate heavy metal removal process in the sediment generated in the recycling process, which has the effect of shortening the recycling process time.

In addition, the mixing efficiency between the mixed solution in which carbon dioxide and chlorine bypass dust are stirred can be increased, and the performance of extracting calcium contained in the mixed solution as a carbonate-type precipitate can be improved.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic diagram illustrating a recycling system for chlorine bypass dust according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a recycling system for the chlorine bypass dust of FIG. 1.
Figure 3 is a schematic diagram for explaining the first mineralized part of Figure 1.
Figure 4 is a schematic diagram illustrating the second stirring unit and the second supply line of the first mineralization unit according to another embodiment of the present invention.
Figure 5 is a cross-sectional view schematically showing a cross-section taken along line AA' of Figure 4.
Figure 6 is a schematic diagram illustrating the second stirring unit and the second supply line of the first mineralization unit according to another embodiment of the present invention.
Figure 7 is a schematic cross-sectional view for explaining the power transmission unit of Figure 6.
FIG. 8 is a flowchart for explaining a recycling method using the chlorine bypass dust recycling system of FIG. 1.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Embodiments described herein will be explained with reference to cross-sectional views and/or plan views, which are ideal illustrations of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content. Accordingly, the regions illustrated in the drawings have schematic properties, and the shapes of the regions illustrated in the drawings are intended to illustrate a specific shape of the region of the device and are not intended to limit the scope of the invention. In various embodiments of the present specification, terms such as first, second, and third are used to describe various components, but these components should not be limited by these terms. These terms are merely used to distinguish one component from another. Embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for describing embodiments and is not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” and/or “comprising” means the presence of one or more other components, steps, operations and/or elements in a mentioned element, step, operation and/or element. or does not rule out addition.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless clearly specifically defined.

Hereinafter, with reference to the drawings, the concept of the present invention and embodiments thereof will be described in detail.

1 is a schematic diagram illustrating a recycling system for chlorine bypass dust according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a recycling system for the chlorine bypass dust of FIG. 1. FIG. 3 is a schematic diagram illustrating the first mineralized portion of FIG. 1.

1 to 3, the chlorine bypass dust recycling system 10 according to an embodiment of the present invention recycles the chlorine bypass dust generated in the cement manufacturing process to produce potassium chloride crystals and calcium carbonate, a raw material for cement. can be obtained. In embodiments, chlorine bypass dust may include chlorine, potassium, calcium, heavy metals (e.g., iron oxide, silicon dioxide, magnesium oxide, cadmium, arsenic, etc.). The chlorine bypass dust recycling system 10 includes a mixing unit 100, a first supply line 130, a second supply line 340, a remover supply unit 150, a coagulant supply unit 160, and a first filtration unit ( 200), a first mineralization unit 300, a second filtration unit 230, a second mineralization unit 400, a third filtration unit 250, an evaporation concentration unit 500, and a cement regeneration unit 600. can do.

The mixing unit 100 may generate a first mixed solution by stirring chlorine bypass dust and water. The mixing unit 100 may include a first stirring tank 110 and a first stirring unit 120. In an embodiment, the first mixed solution may include calcium, potassium, chlorine, heavy metals, etc.

The first stirring tank 110 may have an accommodating space therein. The first stirring tank 110 may be made of a material with excellent thermal conductivity. For example, the first stirring tank 110 may be made of stainless steel, but is not limited thereto.

The first stirring unit 120 may be installed in the first stirring tank 110. The first stirring unit 120 may generate a first mixed solution by stirring the chlorine bypass dust and water. In an embodiment, the first stirring unit 120 may generate a vortex by providing external force to water. Accordingly, the chlorine bypass dust and water are stirred with each other, and calcium, potassium, chlorine, heavy metals, etc. contained in the chlorine bypass dust can be dissolved in the water to generate a first mixed solution. Accordingly, the first mixed solution may contain calcium, potassium, chlorine, heavy metals, etc.

The first supply line 130 may supply water and chlorine bypass dust to the receiving space of the first stirring tank 110. In an embodiment, the first supply line 130 may supply chlorine bypass dust and water to the receiving space at a weight ratio of 1:about 5 to 10. The first supply line 130 may be connected to a storage tank of the evaporation and concentration unit 500, which will be described later.

The remover supply unit 150 may supply a heavy metal remover to the mixing unit 100. The heavy metal remover can leach heavy metals in the first mixed liquid. For example, the heavy metal remover may cause heavy metals contained in the chlorine bypass dust in the first mixed solution to dissolve in water.

The heavy metal remover may include any one of H ₂ O ₂ , NaOCl, and K ₂ CO ₃ . When a heavy metal remover containing NaOCl is used and the retention time is maintained for 5 hours, the remaining amount of lead (Pb) is 88 mg/kg and 20 mg/kg when the NaOCl concentration is 1% and 5%, respectively. If the retention time (unit: hour) is changed to 6 hours, the remaining amount of lead becomes 25.9 mg/kg, and if the retention time is changed to 7 hours, the remaining amount of lead becomes 24.3 mg/kg, and the retention time is changed to 8 hours. If changed, lead will not be detected. In other words, it can be confirmed through experiments that lead cannot be detected in the filtrate when the holding time is maintained for more than 8 hours.

A heavy metal remover containing H ₂ O ₂ was used, and the remaining amount of heavy metal was confirmed by varying the amount of heavy metal remover added to 0.5%, 1%, 1.5%, 2%, and 2.5% of the weight of the dust. At this time, when the heavy metal remover was added at 0.5% by weight, the remaining amount of heavy metal (Pb) was confirmed to be 4.6 mg/kg, and when the heavy metal remover was added at 1.0% by weight, the remaining amount of heavy metal (Pb) was confirmed to be 19 mg/kg. do. However, it can be confirmed through experiments that heavy metal (Pb) is not detected when the heavy metal remover is added in an amount of 1.5% or more by weight.

The coagulant supply unit 160 may supply a coagulant to the mixing unit 100. A coagulant may be added to the first mixed solution. The coagulant can coagulate the leached heavy metals in the first mixed solution. In embodiments, the coagulant may include, but is not limited to, polyaluminum chloride. Coagulants can coagulate and flocculate leached heavy metals.

In an embodiment, the amount of coagulant supplied may be 0.3% to 1.0% of the weight of the first mixed solution depending on the heavy metal content of the chlorine bypass dust and the nature of the heavy metal leached into the first mixed solution. After the coagulant is added to the first mixed solution, it is stirred for about 1 hour and allowed to coagulate and solidify for more than 1 hour. Flocs in which heavy metals are coagulated by a coagulant may include CaCO ₃ , K ₂ SO ₄ , CaSO ₄ , etc.

The first filtering unit 200 may be connected to the mixing unit 100. The first filtering unit 200 may receive the first mixed solution from the mixing unit 100. The first filter 200 may filter aggregates in which heavy metals contained in the first mixed solution are aggregated. At this time, the first filter 200 can pass solutions other than aggregates. Accordingly, the first filter 200 can generate a second mixed solution in which the aggregates have been filtered. The second mixed solution may contain trace amounts of heavy metals that are not aggregated into aggregates.

In an embodiment, the first filter 200 may receive the first mixed liquid at a supply pressure of 7 kg. The first filter unit 200 may be a filter press that presses in the solution to be filtered and filters out solids through filter paper attached to a filter plate.

The first mineralization unit 300 may be connected to the first filtration unit 200. The first mineralization unit 300 may receive the second mixed liquid from the first filtration unit 200. The first mineralization unit 300 may supply carbon dioxide to the supplied second mixed solution to mineralize the calcium contained in the second mixed solution into a first precipitate in the form of carbonate. In an embodiment, the first mineralization unit 300 may include a second agitated tank 310, a second supply line 340, and a second agitation unit 320.

The second stirring tank 310 may have an accommodating space therein. The second stirring tank 310 may be made of a material with excellent thermal conductivity. For example, the second stirring tank 310 may be made of stainless steel, but is not limited thereto.

The second supply line 340 may supply carbon dioxide into the receiving space of the second stirring tank 310. In an embodiment, exhaust gas generated during the cement manufacturing process may be supplied into the receiving space of the second stirring tank 310 through the second supply line 340. Exhaust gases may contain carbon dioxide. At this time, the temperature of the exhaust gas may be between 130 and 150 degrees.

The second stirring unit 320 may be installed in the second stirring tank 310. The second stirring unit 320 may stir the second mixed liquid and carbon dioxide. Accordingly, the efficiency of mineralizing the calcium contained in the second mixed solution into the first precipitate in the form of carbonate can be improved.

The second stirring unit 320 can ensure that the second mixed liquid and the carbon dioxide supplied from the second supply line 340 are well mixed. Accordingly, the calcium contained in the first mixed solution can be quickly mineralized into the first precipitate in the form of carbonate.

For example, calcium oxide (CaO _(s) ) contained in chlorine bypass dust may react with water to produce calcium hydroxide (Ca(OH) _2(aq) ). Calcium hydroxide (Ca(OH) _2(aq) ) can react with carbon dioxide (CO _2(g) ) to produce calcium carbonate (CaCO _3(s) ). At this time, the first precipitate in the form of carbonate may be calcium carbonate (CaCO _3(s) ). Calcium carbonate, the first precipitate, can absorb heavy metals such as lead, iron oxide, magnesium oxide, etc. Accordingly, the first precipitate can remove the remaining amount of heavy metal contained in the second mixture.

The second stirring unit 320 may include a rotating shaft 321, a rotating part 325, and a rotating vane part 323. Rotating shaft 321 may be located within second stirred tank 310. In an embodiment, the rotating shaft 321 may be located at the center of the second stirred tank 310. A portion of the rotating shaft 321 may be located in the receiving space of the second stirring tank 310, and the remaining portion may be exposed to the outside of the stirring tank.

The rotating part 325 may be connected to the rotating shaft 321. The rotating part 325 may be located outside the second stirring tank 310. The rotating part 325 can rotate the rotating shaft 321. In an embodiment, the rotating part 325 may be a motor that is connected to one end of the rotating shaft 321 and rotates the rotating shaft 321, but is not limited thereto.

One or more rotating vane units 323 may be installed on the rotating shaft 321. The rotating vane unit 323 may be located within the receiving space of the second stirring tank 310. The rotating vane unit 323 may be rotated by the rotating shaft 321 to flow the second mixed liquid or water in the second stirring tank 310. Accordingly, the second mixed liquid and carbon dioxide in the second stirring tank 310 can be well stirred. The rotating vane portion 323 may include a coupling ring portion 3231 and a plurality of vane wings 3235.

The coupling ring portion 3231 may be coupled to the rotary shaft 321 while surrounding the circumference of the rotary shaft 321. The vane wings 3235 may be arranged at regular intervals along the circumference of the coupling ring portion 3231. Each of the vane wings 3235 may be in contact with water to provide rotational force of the rotating portion 325 to the water. Accordingly, the water and chlorine bypass dust can be stirred.

Each of the vane wings 3235 may include a first surface 3235a that resists contact with water. In an embodiment, each of the vanes 3235 may be formed in a plate shape. Each of the vane wings 3235 may include a first surface 3235a and a second surface 3235b facing each other. Accordingly, when the rotary shaft 321 rotates, the first surface 3235a resists water, so that the second mixed liquid and carbon dioxide can be well stirred.

The second filtration unit 230 may be connected to the first mineralization unit 300. The second filtration unit 230 may receive the second mixed solution from the first mineralization unit 300. The second filter 230 may filter the first precipitate contained in the second mixed solution. At this time, the second filter 230 can pass solutions other than the first precipitate. Accordingly, the second filter 230 may generate a third mixed solution from which the first precipitate has been removed.

The third mixed solution may contain a remaining amount of potassium, chlorine, etc. that has not been separated into the first precipitate. Chlorine contained in the chlorine bypass dust may be separated into a first precipitate and a third mixed solution by the second filter 230.

In an embodiment, the second filter 230 may receive the third mixed liquid at a supply pressure of 7 kg. The second filter unit 230 may be a filter press that presses in the solution to be filtered and filters out solids through filter paper attached to the filter plate.

The second mineralization unit 400 may be connected to the second filtration unit 230. The second mineralization unit 400 may receive the third mixed solution from the second filtration unit 230. The second mineralization unit 400 may supply carbon dioxide to the supplied third mixed solution to mineralize the calcium contained in the third mixed solution into a second precipitate in the form of carbonate. In an embodiment, the second mineralization unit 400 may include a buffer tank and a bypass line 450.

The buffer tank may include an accommodating space therein for accommodating the third mixed liquid. In an embodiment, the lower portion of the buffer tank may be formed in a triangular pyramid shape so that the third mixed solution can be completely drained.

The bypass line 450 may be connected to the second supply line 340. Accordingly, carbon dioxide can be supplied from the second supply line 340. Bypass line 450 may supply carbon dioxide into the buffer tank. Accordingly, carbon dioxide may be supplied to the third mixed liquid.

As carbon dioxide is supplied to the third mixed solution, the remaining amount of calcium that has not been mineralized in the first mineralization unit 300 can be mineralized into a second precipitate in the form of carbonate. The second precipitate may include calcium carbonate. As described above, calcium carbonate can absorb the remaining amount of heavy metals contained in the third mixed liquid.

The third filtration unit 250 may be connected to the second mineralization unit 400. The third filtration unit 250 may receive the third mixed solution from the second mineralization unit 400. The third filter 250 may filter the second precipitate contained in the third mixed solution. By filtering the second precipitate in the third filter 250, the third filter 250 can generate the fourth mixed solution. In an embodiment, the third filtering unit 250 may be a membrane filter that has fine filtration holes and filters particles with a smaller diameter than the fine filtration holes. The fourth mixed solution that has passed through the membrane filter may be an aqueous solution of potassium chloride (KCl _(aq) ) having a certain concentration. In an embodiment, the potassium chloride concentration of the fourth mixed solution filtered by the third filter 250 may be 3%, but is not limited thereto. The third filtration unit 250 may include a pressure control pump that adjusts the pressure of the third mixed solution supplied to the membrane filter.

The evaporation and concentration unit 500 may be connected to the third filtration unit 250. The evaporation and concentration unit 500 may evaporate and concentrate the fourth mixed solution supplied from the third filtration unit 250. Accordingly, the evaporation and concentration unit 500 can generate potassium chloride crystals from the fourth mixed solution. The evaporation and concentration unit 500 may include an evaporator 510, a centrifugal separator 520, a dryer 530, and a storage tank 540.

The evaporator 510 may concentrate the fourth mixed liquid by evaporating water (moisture) contained in the fourth mixed liquid. Accordingly, the concentration of potassium chloride in the fourth mixed solution may increase to generate calcium chloride crystals.

In an embodiment, the evaporator 510 may include a closed container maintained at a condition lower than the saturated vapor pressure of water. When the fourth liquid mixture filtered by the third filter 250 is sprayed into an airtight container, the water (moisture) in the sprayed fourth liquid liquid may be instantaneously vaporized and evaporated. Water (moisture) evaporated in the evaporator 510 may be condensed and supplied to the storage tank 540.

Additionally, in the evaporator 510, some of the potassium chloride in the fourth mixed liquid may precipitate as potassium chloride crystals and the remainder may exist in a solution. Accordingly, the calcium chloride concentration of the fourth mixed solution may increase from 3% to 42%.

The storage tank 540 may store water evaporated in the evaporator 510. The storage tank 540 may be connected to the first supply line 130. Accordingly, the storage tank 540 can supply water to the mixing unit 100. In other words, some of the water in the fourth mixed liquid is re-supplied to the mixing unit 100, thereby saving water.

The centrifugal separator 520 may separate potassium chloride crystals from the fourth mixed solution with increased potassium chloride concentration. The separated calcium chloride crystals may be transferred to the dryer 530, and the remaining fourth mixed liquid may be supplied to the evaporator 510 again.

The dryer 530 can completely dry calcium chloride crystals containing some moisture. Dried calcium chloride crystals can be used as a raw material for fertilizers, etc.

The cement regeneration unit 600 may produce cement by mixing the first precipitate and/or the second precipitate with cement raw materials. The cement regeneration unit 600 may collect the filtered first sediment and second sediment. The cement regeneration unit 600 may transfer the first sediment and the second sediment to the cement kiln. The first precipitate and the second precipitate transferred to the cement kiln may be mixed with cement raw materials (limestone containing calcium carbonate, clay, iron ore, etc.). The first precipitate and the second precipitate may be mixed with cement raw materials in a cement kiln and heated to high temperature to produce cement (eg, clinker, etc.).

Figure 4 is a schematic diagram illustrating the second stirring unit and the second supply line of the first mineralization unit according to another embodiment of the present invention. Figure 5 is a cross-sectional view schematically showing a cross-section taken along line A-A' in Figure 4. For convenience of explanation, descriptions of the same configurations as those described in FIGS. 1 to 3 will be omitted or briefly described.

Referring to Figures 4 and 5, the second supply line 340 according to another embodiment of the present invention may be connected to the second stirring unit 320. The second supply line 340 may supply carbon dioxide into the second stirring tank 310 through the second stirring unit 320.

The second stirring unit 320 may include a rotating shaft 321, a rotating part 325, and at least one rotating vane part 323.

The rotating shaft 321 may include a first flow path 3213 formed long along the longitudinal direction of the rotating shaft 321 therein. Carbon dioxide (CO _{2 (g)} ) supplied from the second supply line 340 may flow within the first flow path 3213.

The rotating shaft 321 may include an inlet hole located outside the second stirring tank 310. In an embodiment, the inlet hole may be located at one end of the rotating shaft 321. The inlet hole may be connected to the first flow path 3213. The inlet hole may be connected to the second supply line 340. Accordingly, the second supply line 340 is connected to the rotating shaft 321 and can supply carbon dioxide to the first flow path 3213. Carbon dioxide in the second supply line 340 may flow into the first flow path 3213 through the inlet hole.

The rotating shaft 321 may include at least one outlet located within the receiving space of the stirred tank. In an embodiment, the rotating shaft 321 may include a plurality of discharge portions. A plurality of discharge units may be arranged along the longitudinal direction of the rotating shaft 321.

The discharge unit may include a plurality of discharge holes 3215 arranged at regular intervals along the circumference of the rotating shaft 321. Each of the plurality of discharge holes 3215 may be connected to the first flow path 3213. Accordingly, carbon dioxide gas flowing within the first flow path 3213 may be discharged through the discharge holes 3215. The width of each of the discharge holes 3215 may be smaller than the width of the first flow path 3213.

The rotating part 325 may be connected to the rotating shaft 321. The rotating part 325 may be located outside the second stirring tank 310. The rotating part 325 can rotate the rotating shaft 321. In the embodiment, the rotation unit 325 includes a motor unit that generates a rotation force, a pulley 3253 installed on the rotation shaft 321, and a connection that supplies the rotation force of the motor unit 3251 to the pulley 3253. It may include a wire 3252. The rotational force transmitted to the pulley 3253 through the connection wire 3252 may rotate the rotary shaft 321.

One or more rotating vane units 323 may be installed on the rotating shaft 321. The rotating vane portion 323 may be located within the receiving space of the stirred tank. The rotating vane unit 323 may discharge carbon dioxide supplied from the second supply line 340 into the second stirring tank 310.

The rotating vane unit 323 may be rotated by the rotating shaft 321 to flow the second mixed liquid in the second stirring tank 310. Accordingly, the second mixed liquid in the second stirring tank 310 and the carbon dioxide injected from the rotating vane unit 323 can be stirred. The rotating vane portion 323 may include a coupling ring portion 3231 and a plurality of vane wings 3235.

The coupling ring portion 3231 may be coupled to the rotary shaft 321 while surrounding the circumference of the rotary shaft 321. In an embodiment, the coupling ring portion 3231 may be formed in a circular ring shape, but is not limited thereto. The coupling ring portion 3231 may include a plurality of second flow paths 3233 connected to the first flow path 3213. The second flow paths 3233 may be arranged along the perimeter of the coupling ring portion 3231.

The plurality of second flow paths 3233 may be formed to be long in a radial direction with respect to the rotating shaft 321. In an embodiment, each of the plurality of second flow paths 3233 may be positioned to correspond to each of the discharge holes 3215. Accordingly, each of the second flow paths 3233 may be connected to each of the discharge holes 3215. Accordingly, carbon dioxide gas in the first flow path 3213 may flow into the second flow paths 3233 through the discharge holes 3215.

Each of the vane wings 3235 may be arranged at regular intervals along the circumference of the coupling ring portion 3231. In the embodiment, two vane wings 3235 may be coupled to the coupling ring portion 3231. Each of the vanes 3235 may be symmetrical with respect to the rotating shaft 321.

Each of the vane wings 3235 may be formed in a plate shape. Each of the vane wings 3235 may include a first surface 3235a and a second surface 3235b facing each other. In an embodiment, the first surface 3235a may be a surface that receives water resistance when the rotating shaft 321 rotates.

Each of the vane wings 3235 includes a third flow path 3236 connected to one of the second flow paths 3233, and a plurality of fine discharge holes 3237 connected to the third flow path 3236. can do. In an embodiment, each of the fine discharge holes 3237 may be formed on the first surface 3235a. Accordingly, the carbon dioxide gas supplied through the first flow path 3213 is supplied into the stirring tank through the discharge holes 3215, the second flow paths 3233, the third flow path 3236, and the fine discharge holes 3237. It can be.

The vanes 3235 supply carbon dioxide through the fine discharge holes 3237 while contacting water, thereby increasing the dissolution rate between the carbon dioxide gas and the second mixed solution.

Figure 6 is a schematic diagram illustrating the second stirring unit and the second supply line of the first mineralization unit according to another embodiment of the present invention. Figure 7 is a schematic cross-sectional view for explaining the power transmission unit of Figure 6. For convenience of explanation, descriptions of the same configurations as those described in FIGS. 1 to 5 will be omitted or briefly described.

Referring to FIGS. 6 and 7 , the second supply line 340 according to another embodiment of the present invention may be connected to the second stirring unit 320. The second supply line 340 may supply carbon dioxide into the second stirring tank 310 through the second stirring unit 320.

The second stirring unit 320 may include a rotating shaft 321, a rotating part 325, at least one rotating vane part 323a, and a power transmission part 327.

The rotating shaft 321 may include a first flow path 3213 formed long along the longitudinal direction of the rotating shaft 321 therein. Carbon dioxide (CO _{2 (g)} ) supplied from the second supply line 340 may flow within the first flow path 3213.

The rotating shaft 321 may include a plurality of discharge holes 3215. The plurality of discharge holes 3215 may be connected to the first flow path 3213. Discharge holes 3215 may be arranged along the longitudinal direction of the rotating shaft 321. Carbon dioxide (C) may be supplied into the second stirring tank 310 through the discharge holes 3215.

The rotating part 325 may be connected to the rotating shaft 321. The rotating part 325 may be located outside the second stirring tank 310. The rotating part 325 can rotate the rotating shaft 321. In the embodiment, the rotation unit 325 includes a motor unit 3251 that generates a rotation force, a pulley 3253 installed on the rotation shaft 321, and a rotation force of the motor unit 3251 to the pulley 3253. It may include a supply connecting wire 3252. The rotational force transmitted to the pulley 3253 through the connection wire 3252 may rotate the rotary shaft 321.

The power transmission unit 327 may transmit rotational power to the rotation vane unit 323a. The power transmission unit 327 may be installed on the rotating shaft 321. The power transmission unit 327 may include a sun gear 3271, a plurality of pinion gears 3273, a ring gear 3272, and a carrier 3274.

Sun gear 3271 may be installed on the rotating shaft 321. The sun gear 3271 can rotate by the rotational force of the rotating shaft. Accordingly, the power transmission unit 327 can receive the rotational force of the rotation unit through the rotation shaft.

The ring gear 3273 may surround the sun gear 3271. Accordingly, the sun gear 3271 may be located within the ring gear 3273.

Pinion gears 3273 may be located within ring gear 3273. Pinion gears 3273 may be located between sun gear 3271 and ring gear 3273. Each of the pinion gears 3273 may be engaged with the sun gear 3271 and the ring gear 3273. Pinion gears 3273 may be arranged at regular intervals along the circumference of the sun gear 3271.

The carrier 3274 may be connected to a plurality of pinion gears 3273. The carrier 3274 may be spaced apart from the ring gear and the sun gear 3271. Carrier 3274 may surround the periphery of the rotating shaft. The carrier 3274 may rotate when the plurality of pinion gears 3273 move along the circumference of the sun gear 3271.

The rotating vane unit 323a may be connected to the power transmission unit 327. A plurality of rotating vane units 323a may be provided. The plurality of rotating vanes 323a may be spaced apart from each other. In an embodiment, a plurality of rotating vanes 323a may be arranged along the circumference of the rotating shaft.

Each of the plurality of rotating vanes 323a may be connected to each of the pinion gears 3273. The plurality of rotating vanes 323a may be connected to the carrier 3274. Each of the plurality of rotating vanes 323a may include a stirring shaft 3236 and a stirring vane 3238.

The stirring shaft 3236 may be formed to be long in one direction. In an embodiment, the stirring shaft 3236 may be formed in a cylindrical shape. The stirring shaft may be connected to any one of the pinion gears 3273. In an embodiment, the stirring shaft may be connected to the pinion gear 3273 while penetrating the center of the pinion gear 3273. Accordingly, the stirring shaft 3236 can rotate as the pinion gear 3273 rotates.

Stirring vane 3238 may be installed on the stirring shaft 3236. The stirring vane 3238 may be formed along the longitudinal direction of the stirring shaft 3236. The stirring vane 3238 may be formed in a spiral shape surrounding the stirring shaft 3236. Accordingly, the stirring vane 3238 can improve the mixing performance of carbon dioxide by swirling the second mixed liquid while minimizing friction with the second mixed liquid when rotated by the stirring shaft 3236.

A process in which the power transmission unit 327 rotates the plurality of rotary vanes 323a will be described.

First, the rotating part can rotate the rotating shaft. In an embodiment, the rotation unit may rotate the rotation shaft in a first direction (eg, clockwise). Accordingly, the rotating shaft may rotate in the first direction. While the rotating shaft rotates in the first direction, carbon dioxide supplied from the second supply line may be injected into the second stirring tank 310. Accordingly, carbon dioxide can be supplied to the second mixed liquid in the second stirring tank 310 in all directions.

As the rotating shaft rotates in the first direction, the sun gear 3271 installed on the rotating shaft may also rotate in the first direction. Accordingly, the pinion gears 3273 engaged with the sun gear 3271 may rotate in the second direction (eg, counterclockwise). In embodiments, the second direction may be opposite to the first direction.

As the pinion gears 3273 rotate in the second direction, the stirring shaft 3236 connected to each of the pinion gears 3273 may also rotate in the second direction. As the stirring shaft 3236 rotates in the second direction, the helical stirring vane 3238 may generate a vortex in the second mixed liquid. As the vortex is generated, the mixing efficiency between the carbon dioxide injected from the rotating shaft and the second mixed liquid can be improved.

The pinion gears 3273 may rotate in the second direction and move in the first direction along the circumference of the sun gear 3271. Accordingly, the plurality of rotating vanes 323a may move in the first direction along the circumference of the rotating shaft.

By moving the plurality of rotating vanes 323a along the circumference of the rotating shaft, the plurality of rotating vanes 323a can cause the second mixed liquid to flow in the first direction. As the second mixed liquid flows in the first direction by the rotating vane unit 323a, the mixing efficiency between the second mixed liquid and carbon dioxide can be improved.

As the pinion gears 3273 move in the first direction along the circumference of the sun gear 3271, the carrier 3274 may rotate in the first direction. At this time, the ring gear 3273 may not rotate but may be fixed.

The operation of the chlorine bypass dust recycling system according to the present invention configured as described above will be described as follows.

FIG. 8 is a flowchart for explaining a recycling method using the chlorine bypass dust recycling system of FIG. 1.

Referring to Figures 1 to 3 and Figure 8, the recycling method of chlorine bypass dust generated in the cement manufacturing process removes heavy metals contained in the chlorine bypass dust and obtains a carbonate-type precipitate with the heavy metals removed. Therefore, it can be recycled as a raw material for cement. In addition, the recycling method of chlorine bypass dust allows resource recycling by evaporating and concentrating the mixed solution from which sediments have been removed to obtain potassium chloride crystals, which are raw materials for fertilizers, etc. The recycling method of chlorine bypass dust includes the first mixed solution acquisition step (S100), heavy metal leaching step (S150), heavy metal flocculation step (S170), first filtration step (S200), first mineralization step (S300), and cement regeneration. It may include step S800. Additionally, the recycling method of chlorine bypass dust may include a second filtration step (S400), a second mineralization step (S500), a third filtration step (S600), and a calcium chloride crystal acquisition step (S700).

First, in the first mixed solution acquisition step (S100), the first supply line 130 may supply chlorine bypass dust and water to the mixing unit 100. The mixing unit 100 may stir the supplied chlorine bypass dust and water to generate a first mixed solution containing chlorine, potassium, calcium, heavy metals, etc. Accordingly, the first mixed liquid can be obtained.

In an embodiment, the first supply line 130 may supply water and chlorine bypass dust into the receiving space of the first stirring tank 110 at a weight ratio of 10:1. The first stirring unit 120 of the mixing unit 100 may stir the water and chlorine bypass dust in the first stirring tank 110. Accordingly, a first mixed solution in which water and chlorine bypass dust are mixed may be generated.

In the heavy metal leaching step (S150), the remover supply unit may supply a heavy metal remover to the mixing unit 100. Accordingly, a heavy metal remover may be added to the first mixed solution. As the heavy metal remover is added to the first mixed solution, heavy metals contained in the chlorine bypass dust may leach into the solution. The heavy metal remover may include at least one of H ₂ O ₂ and NaOCl.

In the heavy metal coagulation step (S170), the coagulant supply unit 160 may supply a coagulant to the first mixed solution. Accordingly, heavy metals leached into the first mixed solution may coagulate. As heavy metals coagulate, heavy metal aggregates may be formed in the first mixed liquid. In embodiments, the coagulant may include polyaluminum chloride.

In the first filtration step (S200), the mixing unit 100 may supply the first mixed solution in which heavy metals are coagulated to the first filtration unit 200. The first filtering unit 200 may filter the first mixed solution supplied from the mixing unit 100. Accordingly, heavy metal aggregates contained in the first mixed solution can be filtered. As the heavy metal aggregates in the first mixed solution are filtered, the first filter 200 may generate a second mixed solution with a lower heavy metal concentration than the first mixed solution.

In the first mineralization step (S300), the first mineralization unit 300 may receive the second mixed liquid from the first filtration unit 200. The first mineralization unit 300 may supply carbon dioxide to the second mixed solution to mineralize the calcium contained in the second mixed solution into a first precipitate in the form of carbonate. In an embodiment, calcium in the second mixed solution may be contained in the form of calcium hydroxide ions. Calcium hydroxide ions can react exothermically with carbon dioxide to produce calcium carbonate. The first precipitate containing calcium carbonate may absorb trace amounts of heavy metals contained in the second mixed solution.

In the second filtration step (S400), the second mineralization unit 400 may supply the second mixed solution in which the second precipitate is generated to the second filtration unit 230. The second filter 230 may filter the first precipitate contained in the second mixed liquid to obtain the third mixed liquid. Accordingly, the concentration of heavy metals, etc. in the third mixed liquid may be lower than the concentration of heavy metals, etc. in the second mixed liquid. The first precipitate may be supplied to the cement regeneration unit.

In the second mineralization step (S500), the third mixed liquid may be supplied to the second mineralization unit (400). The second mineralization unit 400 may supply carbon dioxide to the supplied third mixed solution to mineralize the remaining calcium contained in the third mixed solution into a second precipitate in the form of carbonate. Accordingly, the calcium contained in the third mixed liquid is secondarily mineralized, and the second precipitate reabsorbs the heavy metals, thereby minimizing the concentration of heavy metals contained in the third mixed liquid.

In the third filtration step (S600), the third mixed liquid may be supplied to the third filtration unit 250. The third filter 250 may filter the second precipitate contained in the supplied third mixed solution to obtain the fourth mixed solution. The concentration of heavy metals, etc. in the fourth mixed solution may be lower than the concentration of heavy metals, etc. in the third mixed solution. Accordingly, most heavy metals, calcium, etc. can be removed from the fourth mixed solution. In an embodiment, the fourth mixed solution may be formed of an aqueous potassium chloride solution having a certain concentration (about 4%). The filtered secondary precipitate may be supplied to the cement regeneration unit.

In the cement regeneration step (S800), the first precipitate and the second precipitate may be supplied to the cement regeneration unit. The cement reproduction unit can check the concentration of heavy metals in the first sediment and the second sediment. Because heavy metals were primarily removed from the first mixed solution, the heavy metal concentrations in the first and second precipitates may be below the standard recyclable value. Accordingly, the first precipitate and the second precipitate can be dried and mixed with cement raw materials without a separate heavy metal removal process.

The dried first precipitate and second precipitate can be reproduced into cement by mixing with cement raw materials.

In the potassium chloride crystal acquisition step (S700), the fourth mixed solution may be supplied to the evaporation and concentration unit (500). The evaporation and concentration unit 500 may evaporate and concentrate the fourth mixed liquid to obtain calcium chloride crystals from the third mixed liquid. In an embodiment, the evaporation and concentration unit 500 may evaporate water (moisture) contained in the fourth mixed solution. Accordingly, the calcium chloride concentration of the fourth mixed solution may increase from 4% to 42%. Additionally, as the calcium chloride concentration of the fourth mixed solution increases, calcium chloride crystals may be generated in the fourth mixed solution.

The fourth mixed solution containing calcium chloride crystals may be separated from water through a centrifuge 520. The separated calcium chloride crystals are dried in the dryer 530, and the calcium chloride crystals can be reused as raw materials such as fertilizers. Additionally, the evaporated water can be condensed, stored in a storage tank, and reused as water supplied to the mixing unit 100.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and can be used in the technical field to which the invention pertains without departing from the gist of the present invention as claimed in the patent claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

10: Recycling system of chlorine bypass dust
100: mixing section
200: first filtration unit
230: second filtration unit
250: Third filtration unit
300: First mineralization zone
400: Second mineralization zone
500: Evaporation and concentration unit
600: Cement recycling unit

Claims (4)

A mixing section that stirs the chlorine bypass dust and water to produce a first mixed solution containing calcium, potassium, chlorine, and heavy metals;
a remover supply unit supplying a heavy metal remover that leaches the heavy metal in the first mixed solution to the mixing unit;
a coagulant supply unit that supplies a coagulant to coagulate the heavy metals leached from the first mixed solution to the mixing unit;
a first filtering unit connected to the mixing unit and generating a second mixed liquid by filtering the aggregates in which the heavy metals contained in the first mixed liquid are aggregated;
a first mineralization unit that supplies carbon dioxide to the second mixed solution to mineralize the calcium contained in the second mixed solution into a first precipitate in the form of carbonate;
a second filtering unit connected to the first mineralization unit and generating a third mixed liquid by filtering the first precipitate contained in the second mixed liquid; and
It includes a cement regeneration unit that produces cement by mixing the first sediment with cement raw materials,
1st Mineralization Division,
a second stirring tank having an accommodating space therein for accommodating the second mixed liquid;
a second supply line supplying carbon dioxide into the second stirring tank; and
It is installed in the second stirring tank and includes a second stirring unit for stirring the second mixed liquid and carbon dioxide,
The second supply line is connected to the second stirring unit and supplies carbon dioxide into the second stirring tank through the second stirring unit,
The second stirring unit,
a rotating shaft located within the second stirring tank and having a plurality of discharge holes for discharging the carbon dioxide supplied through the second supply line;
a plurality of rotating vane parts spaced apart from the rotating shaft and arranged along a circumference of the rotating shaft;
a rotating part that rotates the rotating shaft; and
A power transmission unit installed on the rotating shaft, connected to the rotating vane unit, and transmitting rotational power of the rotating unit to the rotating vane unit,
The power transmission unit,
a sun gear installed on the rotating shaft;
a ring gear surrounding the sun gear;
a plurality of pinion gears positioned between the ring gear and the sun gear and engaged with the sun gear and the ring gear and arranged along the circumference of the sun gear; and
A carrier connected to the pinion gears and rotated by the pinion gears rotating along the circumference of the sun gear,
A recycling system for chlorine bypass dust where the rotating vane unit is connected to each of the pinion gears.
According to claim 1,
The second stirring unit,
a rotating shaft located within the second agitated tank;
a rotating part that rotates the rotating shaft; and
A recycling system for chlorine bypass dust including at least one rotating vane unit installed on the rotating shaft and discharging carbon dioxide while rotating by the rotating shaft.
According to claim 1,
a second mineralization unit that supplies carbon dioxide to the third mixed solution to mineralize the calcium contained in the third mixed solution into a second precipitate in the form of carbonate;
a third filtering unit connected to the second mineralization unit and generating a fourth mixed liquid by filtering the second precipitate contained in the third mixed liquid; and
A recycling system for chlorine bypass dust including an evaporation and concentration unit for evaporating and concentrating the fourth mixed solution to generate potassium chloride crystals from the fourth mixed solution.
According to claim 1,
A recycling system for chlorine bypass dust wherein the coagulant includes polyaluminium chloride.