Device for sintering and solidifying heavy metals in polluted soil

Abstract

The utility model discloses a device for sintering and solidifying heavy metals in polluted soil. The device comprises a sintering furnace body, a plurality of material flowing plates and a plurality of microwave heating pipes, the sintering furnace body is of a hollow rotary cavity structure, a feeding port is formed in the upper portion of the sintering furnace body, and a discharging port is formed in the lower portion of the sintering furnace body. A plurality of material flowing plates are arranged below the feeding port and above the discharging port, and a plurality of microwave heating pipes are arranged in the center of the interior of the sintering furnace body. Polluted soil is sintered and solidified in a microwave sintering mode, the device is suitable for sintering granules, the sintering efficiency is high, and the electricity consumption is obviously lower than that of a traditional electric furnace. According to the specific structure, the vertical sintering furnace is adopted, continuous operation can be achieved, the flowing speed of particles is slowed down through the multiple material flowing plates, meanwhile, waste heat of equipment can be effectively used for preheating the particles, the microwave heating pipes achieve sufficient sintering in a stepped discharging and multiple heating mode, and the curing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of contaminated soil treatment technology, concretely to a contaminated soil sintering solidification heavy metal device. BACKGROUND

[0002] Heavy metal contaminated soil refers to soil in which the content of heavy metals exceeds the background value, posing a threat to the environment and human health. Common heavy metal contaminants include lead (Pb), cadmium (Cd), mercury (Hg), and chromium (Cr). These heavy metals can enter the soil through natural processes or human activities (such as industrial emissions, agricultural fertilizers and pesticides, etc.), causing serious impacts on plant growth, soil ecosystems, and human health. Common heavy metal contaminated soil treatment solutions include physical remediation techniques (such as soil replacement, electrokinetic remediation, and thermal treatment), chemical remediation techniques (such as chemical leaching and solidification / stabilization techniques), and biological remediation techniques (such as phytoremediation, zooremediation, and microbioremediation). Among these, sintering solidification of heavy metal contaminated soil is a physical-chemical remediation technique that involves fixing heavy metals in soil into a material with higher stability through high-temperature treatment, thereby reducing their mobility and bioavailability.

[0003] Compared to traditional sintering techniques, microwave sintering has the advantages of fast heating speed, high energy efficiency, low sintering temperature, improved material performance, safe operation, and environmental friendliness. It is an efficient, energy-saving, and environmentally friendly sintering method. For example, patent CN108101511A discloses a microwave sintering method for preparing ceramsite from heavy metal contaminated soil and incinerated fly ash. However, most of the current research is still in the laboratory stage. The main problem is that the amount of soil that needs to be treated during soil remediation is large, and the commonly used microwave sintering equipment often cannot handle it well. Patent CN103822464B discloses a continuous industrial microwave calcination furnace for small particle and powder materials, but it still has problems such as high heat loss and short microwave heating time. SUMMARY

[0004] The utility model discloses a kind of contaminated soil sintering solidification heavy metal devices to solve the problems existing in prior art.

[0005] To achieve the above object, the technical scheme of the utility model provides a kind of contaminated soil sintering solidification heavy metal device, it is applicable to the sintering of granular material, including sintering furnace body, several flow sheets, several microwave heating pipes;The sintering furnace body is the hollow rotary cavity structure, and the upper portion is provided with inlet, and the lower portion is provided with discharge port;Several flow sheets are provided below the inlet and above the discharge port, and several microwave heating pipes are provided in the central part of the sintering furnace body.

[0006] Further, the flow plate comprises, from top to bottom, a first flow cap, a first receiving disc, a second flow cap, a second receiving disc, a guide disc, a third receiving disc, and a third flow cap; the first flow cap, the second flow cap, and the third flow cap are conical, with their axes being collinear with the axis of the feeding port, and their bottom diameters being smaller than the inner diameter of the sintering furnace body; the first receiving disc, the second receiving disc, and the third receiving disc are circular truncated cones, with their bottom centers being provided with openings, and their axes being collinear with the axis of the feeding port; the guide disc is provided with a plurality of through holes, and the through holes are provided with microwave heating pipes.

[0007] Further, the top of the first receiving disc and the top of the third receiving disc are in sealed connection with the inner wall of the sintering furnace body; the top of the second receiving disc has a diameter smaller than the inner diameter of the sintering furnace body, and is provided with a material blocking ring; the bottom diameter of the second flow cap is smaller than the inner diameter of the material blocking ring, and the lowest part of the second flow cap is below the highest part of the material blocking ring.

[0008] Further, the second receiving disc is provided with a ventilation pipe penetrating through the second receiving disc.

[0009] Further, the upper surfaces of the first flow cap, the second flow cap, the third flow cap, the first receiving disc, the second receiving disc, and the third receiving disc are provided with a plurality of circumferentially arrayed fold line material blocking plates.

[0010] Further, the guide disc comprises a conical part and a bottom provided with a material guiding and blocking ring.

[0011] Further, the microwave heating pipe comprises a heating pipe body, which is a hollow tubular structure, and a plurality of microwave generators arranged outside the heating pipe body.

[0012] Further, a plurality of staggered material blocking pieces are arranged inside the heating pipe body, and the material blocking pieces are arranged in an inclined manner, with a gap being arranged between the lower side of the material blocking piece and the inner wall of the heating pipe body, and the higher side of the lower material blocking piece being located at the gap of the upper material blocking piece.

[0013] Further, a gap is arranged in the area below the material blocking piece of the heating pipe body, the upper part of the gap is a material blocking piece, the lower part of the gap is provided with a gap blocking piece, the gap blocking piece is parallel to the lower material blocking piece, and the microwave generator is arranged on the gap blocking piece.

[0014] Further, a powder screening sieve is arranged on the guide disc in the feeding port area of the microwave heating pipe, the powder screening sieve is an array of holes arranged outside the guide disc in the feeding port area of the microwave heating pipe, a powder receiving disc is arranged below the powder screening sieve, the powder receiving disc is a disc structure, is fixed to the bottom surface of the guide disc, and has an inclined bottom surface provided with a through hole for the microwave heating pipe to pass through, and the bottom surface is also provided with a powder outlet through which the pipe extends to the outside of the sintering furnace body.

[0015] The utility model provides a kind of polluted soil sintering heavy metal device, and polluted soil is sintered using the mode of microwave sintering, it is applicable to the sintering of granular material, and its sintering efficiency is higher, and power consumption is significantly lower than traditional electric furnace.In specific structure, vertical sintering furnace is used, continuous operation can be realized, by the setting of multiple flow plates, the flow speed of granular material can be slowed down, and the equipment waste heat can be effectively utilized to preheat granular material, and by the setting of upper and lower flow plates, heat loss can be effectively reduced.Microwave heating tube adopts ladder blanking, multiple heating mode to realize sufficient sintering, to achieve solidification effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the overall scheme diagram of the utility model.

[0017] Figure 2 It is the overall scheme stereogram of the utility model.

[0018] Figure 3 It is the flow plate local schematic diagram of one embodiment of the utility model.

[0019] Figure 4 It is the flow plate local schematic diagram of another embodiment of the utility model.

[0020] Figure 5 It is the guide plate schematic diagram of another embodiment of the utility model.

[0021] Figure 6 It is the microwave heating tube schematic diagram of another embodiment of the utility model.

[0022] Figure 7 It is the guide plate local schematic diagram of one embodiment of the utility model.

[0023] Figure 8 It is the guide plate local schematic diagram of another embodiment of the utility model. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] As shown in the accompanying Figures 1-8As shown, the utility model relates to a kind of polluted soil sintering solidification heavy metal device, and polluted soil is sintered and solidified using the mode of microwave sintering, applicable to the sintering of granular material, and granulation operation is needed before sintering to polluted soil, and other substances such as fly ash can be added during granulation process for synergistic treatment, and its treatment process is not within the protection scope of the present application.

[0026] As shown in the accompanying drawings Figure 1 、 2 As shown, the sintering solidification heavy metal device includes sintering furnace body 1, several flow plates 2, several microwave heating pipes 3.

[0027] The sintering furnace body 1 is a hollow rotary cavity structure, and the upper part is provided with a feeding port 11, and the lower part is provided with a discharge port 12. Below the feeding port 11, a plurality of flow plates 2 are arranged above the discharge port 12, and a plurality of microwave heating pipes 3 are arranged in the central part of the sintering furnace body 1.

[0028] The flow plate 2 includes a first flow cap 21, a first receiving disc 22, a second flow cap 23, a second receiving disc 24, a guide disc 25, a third receiving disc 26 and a third flow cap 27.

[0029] The first flow cap 21, the second flow cap 23 and the third flow cap 27 are conical, and the axis is collinear with the axis of the feeding port 11, and the bottom diameter is smaller than the inner diameter of the sintering furnace body 1.

[0030] The first receiving disc 22, the second receiving disc 24 and the third receiving disc 26 are circular truncated cone, and the bottom center is provided with an opening, and the axis is collinear with the axis of the feeding port 11.

[0031] The top of the first receiving disc 22 and the third receiving disc 26 is in close connection with the inner wall of the sintering furnace body 1, which can reduce the loss of heat in the furnace body through the feeding port 11 and the discharge port 12 without obstruction.

[0032] As shown in the accompanying drawings Figure 3 In order to further realize heat transfer between the second flow cap 23 and the second receiving disc 24, an air pipe penetrating the second receiving disc 24 is arranged on the second receiving disc 24.

[0033] The top diameter of the second receiving disc 24 is smaller than the inner diameter of the sintering furnace body 1, and the top is provided with a material blocking ring 241, and the bottom diameter of the second flow cap 23 is smaller than the inner diameter of the material blocking ring 241, and the lowest part is below the highest part of the material blocking ring 241.

[0034] As shown in the accompanying drawings Figure 4As shown, in order to further slow down the flow speed of the material on the flow plate 2, a plurality of circumferentially arrayed fold line baffle plates D are arranged on the upper surfaces of the first flow cap 21, the second flow cap 23, the third flow cap 27, the first receiving tray 22, the second receiving tray 24, and the third receiving tray 26.

[0035] The material flows into the feeding port 11, sequentially passes through the first flow cap 21, the first receiving tray 22, the second flow cap 23, the second receiving tray 24, and flows to the guide tray 25. The guide tray 25 is provided with a plurality of through holes, and the through holes are provided with microwave heating pipes 3. The material flows into the microwave heating pipes 3 through the guide tray 25, and then flows out to the third receiving tray 26, flows out to the bottom of the sintering furnace body through the third flow cap 27, and flows out through the discharging port 12.

[0036] The guide tray 25 includes a conical portion 2501, and a guide baffle ring 2502 is arranged at the bottom. After the material flows out through the bottom opening of the second receiving tray 24, it falls to the conical portion 2501 and slides into the microwave heating pipe 3. The guide baffle ring 2502 prevents the material from flowing out.

[0037] As shown in the accompanying drawings, Figure 2 The guide baffle ring 2502 can be a ring structure with an inclined side surface, or can be a petal-shaped structure as shown in the accompanying drawings, that is, a u-shaped baffle unit is arranged at each microwave heating pipe 3, and each u-shaped baffle unit is connected near the axis of the conical portion 2501. Figure 5 As shown in the accompanying drawings,

[0038] The microwave heating pipe 3 includes a heating pipe body 31, which is a hollow tubular structure, and a plurality of microwave generators 32 are arranged outside the heating pipe body 31. Figure 6 Further, in order to further slow down the flow speed of the material and improve the heating efficiency, a plurality of staggered baffle plates 311 are arranged inside the heating pipe body 1. The baffle plates 311 are arranged obliquely, and a gap is arranged between the lower side of the baffle plates 311 and the inner wall of the heating pipe body 31. The upper side of the lower baffle plate 311 is located in the gap of the upper baffle plate 311. In the drawings, the baffle plates 311 are staggered left and right, and the gap positions can also be arranged in a spiral manner while being staggered left and right.

[0039] Further, a gap 312 is arranged in the area below the baffle plate 311 of the heating pipe body 31. The upper part of the gap is the baffle plate 311, and the lower part is provided with a gap baffle 313. The gap baffle is parallel to the lower baffle plate 311. The microwave generator 32 is arranged on the gap baffle 313 to further improve the microwave heating efficiency.

[0040] As shown in the accompanying drawings,

[0041] , Figure 7 , 8As shown, by process setting (such as pre-sintering), the selection of additives, the structural strength of the heated material can be improved to reduce the possibility of cracking and crushing during the falling process and the sintering process. A powder sieve 251 is arranged on the material guide plate 25 at the inlet area of the microwave heating tube 3. The powder sieve 251 is an array of openings arranged outside the inlet of the microwave heating tube 3. The powder flows out through the powder sieve, which can reduce the excessive powder entering the microwave heating tube 3. A powder receiving plate 252 is arranged below the powder sieve 251. As shown in the attached Figure 8 As shown in the attached Figure 7 As shown in the attached

[0042] It should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "arranging" and the like should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A device for sintering and solidifying heavy metals in contaminated soil, suitable for sintering of granular material, characterized in that, Including sintering furnace body, several flow material plates, several microwave heating pipes; the sintering furnace body is the hollow rotary cavity structure, is provided with the feed inlet in the upper portion, is provided with the discharge port in the lower portion;Below the feed inlet, a plurality of flow material plates are arranged above the discharge port, a plurality of microwave heating pipes are arranged in the central part of the sintering furnace body.

2. The apparatus for sintering and solidifying heavy metals in contaminated soil according to claim 1, wherein The flow material plate sequentially includes first flow material cap, first receiving disc, second flow material cap, second receiving disc, guide disc, third receiving disc and third flow material cap from top to bottom;The first flow material cap, the second flow material cap and the third flow material cap are conical, and the axis is collinear with the axis of the feed inlet, and the bottom diameter is smaller than the inner diameter of the sintering furnace body;The first receiving disc, the second receiving disc and the third receiving disc are circular table, and the bottom center is provided with an opening, and the axis is collinear with the axis of the feed inlet;A plurality of through holes are arranged on the guide disc, and the through holes are provided with microwave heating pipes.

3. The apparatus for sintering and solidifying heavy metals in contaminated soil according to claim 2, wherein The top of the first receiving disc and the third receiving disc is in close connection with the inner wall of the sintering furnace body;The top diameter of the second receiving disc is smaller than the inner diameter of the sintering furnace body, and the top is provided with a material blocking ring, and the bottom diameter of the second flow material cap is smaller than the inner diameter of the material blocking ring, and the lowest part is below the highest part of the material blocking ring.

4. The apparatus for sintering and solidifying heavy metals in contaminated soil according to claim 3, wherein An air pipe penetrating the second receiving disc is arranged on the second receiving disc.

5. The apparatus of claim 2, wherein the apparatus further comprises a soil mixing device. The upper surfaces of the first flow material cap, the second flow material cap, the third flow material cap, the first receiving disc, the second receiving disc and the third receiving disc are provided with a plurality of circumferential array distribution fold line material blocking plates.

6. The apparatus of claim 2, wherein the apparatus further comprises a soil mixing device. The guide disc includes a conical part and a bottom provided with a guide material blocking ring.

7. The apparatus of claim 2, wherein the apparatus further comprises a soil mixing device. The microwave heating pipe includes a heating pipe body, which is a hollow tubular structure, and a plurality of microwave generators are arranged outside.

8. The apparatus of claim 7, wherein the apparatus further comprises a soil mixing device. A plurality of staggered distribution material blocking pieces are arranged in the heating pipe body, and the material blocking pieces are arranged obliquely, and the lower side of the position is provided with a gap between the inner wall of the heating pipe body, and the higher side of the lower material blocking piece is located at the gap of the upper material blocking piece 1.

9. The apparatus of claim 8, wherein the apparatus further comprises a soil mixing device. A gap is arranged in the heating pipe body below the area of the material blocking piece, and the upper part of the gap is a material blocking piece, and the lower part is provided with a gap blocking piece, which is parallel to the lower material blocking piece, and the microwave generator is arranged on the gap blocking piece.

10. The apparatus of claim 7, wherein the apparatus is characterized by: A powder screening sieve is arranged on the guide disc in the feed inlet area of the microwave heating pipe, which is an array distribution opening arranged outside the guide disc in the feed inlet area of the microwave heating pipe, and a powder receiving disc is arranged below the powder screening sieve, which is a disc structure, and is fixed to the bottom surface of the guide disc, and the bottom surface is inclined, and is provided with a through hole for the microwave heating pipe, and the bottom surface can also be provided with a powder outlet, which extends to the outside through the pipeline penetrating the sintering furnace body.

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