TWI718759B - On-site vitrification conversion device and glass pitch composition - Google Patents

Abstract

An on-site vitrification conversion device, which is used to heat the soil in a local highly polluted area at a polluted site for vitrification. The device at least includes a base body, a first hollow tube, a second hollow tube, and an induction Coil, at least one conduction rod; wherein; the base body is an inverted cone-shaped hollow structure, and the upper end of the base is provided with a loading platform, and the lower end is provided with a feeding channel; the first hollow tube and the second hollow tube The hollow tube is fixed on the loading platform, and the first hollow tube is sleeved on the outside of the second hollow tube to form an accommodating space; the induction coil is disposed in the accommodating space and is wound around The outer side of the second hollow tube is used for receiving an alternating current; and the conduction rod is arranged in the inner space of the second hollow tube.

Description

On-site vitrification conversion device and glass pitch composition

The present invention relates to a technology for vitrification of contaminated soil, in particular to an on-site vitrification conversion device that can be vitrified on-site at a contaminated site, and uses the on-site vitrification conversion device to convert contaminated soil into vitrified solids. The prepared glass pitch composition.

The soil pollution in Taiwan is quite serious. There are a number of organic pollutants and heavy metal pollution concentrations that are ranked first in the world in terms of monitored concentrations. Due to the large differences in the distribution of pollutants in the soil, when dealing with contaminated soil, the selection and implementation of related treatment methods and engineering technologies are relatively more difficult, especially for locally highly contaminated soils. Remediation is particularly difficult.

Although, in many documents, a technical method of vitrification directly on the local highly polluted soil at the polluted site is proposed to improve the cost-effectiveness of contaminated soil treatment, the various environmental conditions of the polluted site are different, no matter it is in the polluted site. Both the processing cost and the processing efficiency have been unsatisfactory.

For example, when using existing technologies for vitrification of contaminated soil, it is usually necessary to dredge the contaminated site first, then transport the contaminated soil obtained from the dredging to a specific treatment site, and then vitrify the contaminated soil. Generally speaking, since about 80%-90% by mass of the contaminated soil are small particles with a particle size of 30μm or less, the existing vitrification treatment technology should be used to treat the contaminated soil. In the dredging process, not only is it easy to cause a large number of small particles of soil to suspend and escape, but also often result in failure to achieve the remediation effect or failure. Therefore, how to avoid the loss of soil contaminated by small particles is a very important issue.

In addition, in other previous documents, there is also a description of a method such as inserting two electrodes with a high potential difference into the contaminated soil to be treated, applying a plasma with a temperature of up to 3000 ℃, heating the soil and presenting it in a molten state, and leaving it to cool down. High-temperature heat treatment technology that forms solids to quickly eliminate organic pollutants and complete the treatment.

Although the use of this plasma processing technology can use high temperature to rapidly coke the contaminated soil to remove pollutants, it is obviously a high-energy and high-cost processing technology due to the need for plasma generation. In addition to unfavorable economic benefits, for example, in the process of processing contaminated soil, the high temperature of plasma processing often causes organic components to escape toxic gases, which may endanger the health of the workers and cause problems. Concerns about secondary environmental hazards.

Therefore, how to develop a method that can not only solve the problems of high energy consumption, high cost, high operating difficulty, ineffective removal of pollutants, harm to the health of workers, and secondary environmental hazards of the above-mentioned conventional technologies, but also achieve stability The new technology of chemical soil, effective removal of pollutants, and easy-to-operate on the current site to treat contaminated soil are indeed issues that the relevant industries urgently need to solve.

In view of this, the inventors of the present invention through painstaking research and searching for various possible solutions to solve the above-mentioned problems of the traditional technology, and then developed a method that can not only improve the above-mentioned problems of the conventional technology, but also has low energy consumption, cost saving, and operation. A novel contaminated soil treatment technology that is easy, conducive to on-site operations, can quickly and effectively treat pollutants, is safe and does not harm health, and does not cause secondary environmental hazards. This completes the present invention.

That is, the present invention can provide an on-site vitrification conversion device, which can easily in situ vitrification (in situ vitrification) the soil of a local highly polluted area at a polluted site. For example, with the on-site vitrification conversion device of the present invention, electromagnetic induction heating is applied to the surface soil pollutants, so that the soil is directly vitrified at the current site at 1400°C, in addition to 97.0 mass%-100.0 mass in the soil In addition to stabilizing the% of heavy metals, it can also make the toxicity dissolution test of the vitrified soil heated by electromagnetic induction meet the legal standards.

In other words, according to one aspect of the present invention, an on-site vitrification conversion device can be provided, which at least includes a base body, a first hollow tube, a second hollow tube, an induction coil, and at least one conductive rod; wherein the base body is An inverted cone-shaped hollow body with a loading platform at the upper end and a feed channel at the lower end, where the feed channel can allow soil to enter; the first hollow tube and the second hollow tube are arranged on the loading platform, and the second hollow tube A hollow tube is sleeved on the outside of the second hollow tube; the induction coil is wound around the second hollow tube for receiving an alternating current to generate electromagnetic induction; the conduction rod is arranged on the second hollow tube In contact with the soil, it is able to generate vitrification reaction of the soil by heating and heating by the induced current.

According to one aspect of the present invention, the induction coil has a density in the range of 0.40 to 0.80 turns/cm, and can receive alternating current with an output voltage of 110 to 380V, a current of 50A or more, and a frequency of 1.0KH or more. The heating rate is in the range of 40~100℃/sec.

According to one aspect of the present invention, the conduction rod is a hollow cylinder and is arranged inside the second hollow tube, and the soil enters the inner space of the conduction rod through the feed channel and undergoes a vitrification reaction when heated.

According to one aspect of the present invention, the on-site vitrification conversion device further includes at least one heat-insulating sheet, the heat-insulating sheet has a ring-shaped structure, and the bottoms of the first hollow tube and the second hollow tube are provided. In order to isolate the conduction rod and the loading platform.

According to one aspect of the present invention, the conductive rod is made of metal or graphite.

According to one aspect of the present invention, the in-situ vitrification conversion device further includes at least one monitoring unit disposed inside the second hollow tube for detecting the soil in the second hollow tube Temperature, heating time, and gas composition released during the reaction.

According to one aspect of the present invention, the on-site vitrification conversion device further includes There is a control unit, and the control unit is electrically connected with the monitoring unit.

Furthermore, the present invention can also provide a glass asphalt composition, which contains at least 1 part by weight to 15 parts by weight of glass aggregates, 80 parts by weight to 100 parts by weight of sand and gravel, and 4.0 parts by weight to 5.5 parts by weight of asphalt Mortar and 2 parts by weight of filler; wherein the glass aggregate is formed by heating the contaminated soil in a specific area to a temperature T (℃) and holding it for t seconds using the on-site vitrification conversion device of the present invention, and the T (℃ ) And t(sec) satisfy the following relationship: 1000≦T≦1600 0≦t≦1000

According to one aspect of the present invention, the contaminated soil further contains a vitrification promoter, and the vitrification promoter includes glass sand, iron sand, sodium oxide, calcium oxide, magnesium oxide, aluminum oxide, calcium carbonate, sodium carbonate, and others. At least one selected from a mixture of others.

According to one aspect of the present invention, the total added amount (Gw) of the vitrification promoter is relative to the total amount of the contaminated soil (Sw), when measured by weight, Sw:Gw is between 20:1 and 1:20 The range; preferably in the range of 15:1 to 1:15; more preferably in the range of 10:1 to 1:10; most preferably in the range of 5:1 to 1:5.

According to one aspect of the present invention, the vitrified solid object is any one of quartz glass, soda lime silica glass, soda borosilicate glass, lead oxide glass, aluminosilicate glass, and oxide glass.

According to one viewpoint of the present invention, the moisture content of the contaminated soil is below 40%; preferably below 20%; more preferably below 10%; most preferably below 5%.

According to one aspect of the present invention, the water absorption of the glass pitch composition is in the range of 0.5 to 3.0%, and the density is in the range of 2000 to 2400 Kg/m ³ .

1: On-site vitrification conversion device

11: Base body

110: loading platform

111: feed channel

12: The first hollow tube

13: The second hollow tube

14: induction coil

15: Conductivity rod

16: screw

17: Insulation sheet

P: threaded hole

Figure 1A shows a schematic diagram of the structure of an on-site vitrification conversion device in an embodiment of the present invention Figure.

Fig. 1B is an exploded schematic diagram showing the structure of the on-site vitrification conversion device shown in Fig. 1A.

Fig. 1C is a top view of the base body in the on-site vitrification conversion device shown in Fig. 1A.

2A is a schematic diagram showing the structure of an on-site vitrification conversion device in another embodiment of the present invention.

Fig. 2B is a top view showing the first hollow tube, the second hollow tube, and the heat insulation ring in the on-site vitrification conversion device shown in 2B.

Figure 3A is a factor response graph showing the removal rate of copper (Cu) in Examples 10 to 18

Figure 3B shows the factor response diagram of the S/N ratio (signal-to-noise ratio) of copper (Cu) in Examples 10 to 18, and Figure 4A shows the removal rate of zinc (Zn) in Examples 10 to 18 Figure 4B shows the factor response diagram of the S/N ratio (signal-to-noise ratio) of zinc (Zn) in Examples 10 to 18.

Figure 5A is a graph showing the variation curve of the stable values (Va) of the test bodies A0, A5, A10 and A15 in Example 19

Fig. 5B is a graph showing the variation curve of the mobility value (VMA) of the test bodies A0, A5, A10 and A15 in Example 19.

Fig. 6A is a graph showing the variation curve of the stable value (Va) of the test bodies B0, B5, B10 and B15 in Example 19.

Fig. 6B is a graph showing the variation curve of the mobility value (VMA) of the test bodies B0, B5, B10 and B15 in Example 19.

FIG. 7A is a graph showing the variation curve of the stable values (Va) of the test bodies C0, C5, C10, and C15 in Example 19.

Fig. 7B is a graph showing the variation curve of the mobility value (VMA) of the test bodies C0, C5, C10 and C15 in Example 19.

Hereinafter, the present invention will be further described in detail in conjunction with embodiments and drawings. However, the following descriptions are only illustrative descriptions, and are not intended to limit the scope of the specification and patent application of the present invention. Unless otherwise defined in this specification, the meanings of the scientific and technical terms used herein are the same as those understood and used by those with ordinary knowledge in the technical field to which the present invention belongs.

In addition, those with ordinary knowledge in this art should understand that the present invention is of course not limited to these examples, and other same or equal functions and sequence of steps can also be used to achieve the invention.

In this article, the numerical values and parameters used to define the scope of the present invention inevitably contain standard deviations due to individual test methods, so they are mostly expressed as approximate quantitative values. However, in specific embodiments, Relevant values presented as accurately as possible. In this context, "about" generally depends on the considerations of those with ordinary knowledge in the technical field to which the present invention belongs, and generally means that the actual value falls within the acceptable standard error of the average value. For example, the actual value is within an acceptable standard error of the average value. Within ±10%, ±5%, ±1%, or ±0.5% of a specific value or range.

First, the types of pollutants contained in the contaminated soil suitable for the vitrification method of the present invention are not particularly limited. For example, they may contain organic pollutants or inorganic pollutants. For example, the inorganic pollutant may be at least one selected from arsenic, cadmium, chromium, copper, mercury, nickel, lead, zinc, and mixtures thereof.

In addition, organic pollutants can be PCBs, dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), butylene phthalate Benzyl methyl ester (BBP), dioctyl phthalate (DNOP), bis(2-ethylhexyl) phthalate (DEHP), diphenyl ether compound polybrominated diphenyl ethers (PBDEs), PAEs , PAHs, PCBs, decabromodiphenyl ether (BDE-209) and at least one of their mixtures.

First, with Figures 1A, 1B, and 1C, the on-site vitrification conversion device of the present invention will be explained. 1A is a schematic structural diagram of the on-site vitrification conversion device of the present invention, 1B is an exploded schematic view of the on-site vitrification conversion device, and FIG. 1C is a top view of the base body 11 in the on-site vitrification conversion device. The on-site vitrification conversion device includes a base body 11, a first hollow tube 12, a second hollow tube 13, an induction coil 14, and a conductive rod 15. The base body 1 is an inverted cone-shaped hollow structure, The base body 11 is provided with a loading platform 110 at the upper end, and a feeding channel 111 at the lower end. The loading platform 110 is used to carry the first hollow tube 12, the second hollow tube 13, and the conductive rod 15, and the feed channel 111 is for soil to enter the device.

The first hollow tube 12 and the second hollow tube 13 are disposed on the loading platform 110, and the first hollow tube sleeve 12 is disposed on the outer side of the second hollow tube 13 to form an accommodating space. The coil 14 is arranged in the accommodating space and wound around the outside of the second hollow tube 12, and the conduction rod 15 is a hollow cylinder arranged in the inner space of the second hollow tube 13, and is made of metal , Or made of graphite, preferably graphite. Moreover, as shown in FIG. 1C, in another embodiment of the present invention, a plurality of threaded holes P may be provided on the outer periphery of the loading platform 110, which can be combined with the screw 16 to fix the first hollow tube 12.

In an embodiment of the present invention, the density of the induction coil 14 is in the range of 0.40 to 0.80 turns/cm; preferably in the range of 0.50 to 0.75 turns/cm; more preferably in the range of 0.60 to 0.70 turns/cm ; The best is in the range of 0.65~0.70 circle/cm. The induction coil 14 can receive alternating current with an output voltage of 110~380V, a current of 50A or more, and a frequency of 1.0KH or more, and the heating rate of the conductance rod 15 is in the range of 40~100°C/sec; preferably In the range of 50~100°C/sec; more preferably in the range of 60~100°C/sec; most preferably in the range of 67~100°C/sec.

In an embodiment of the present invention, the material of the induction coil 14 is metal or conductive metal oxide. For example, it may be gold, silver, aluminum, nickel, copper, chromium, or indium tin oxide (Indium Tin Oxide, ITO), but not limited to this.

Furthermore, according to the technical idea of the present invention, the inner diameter of the first hollow tube 12 is D cm, the inner diameter of the second hollow tube 13 is d cm, and D and d satisfy the following relationship: 80≦D≦300; 40≦d≦285; 0.444≦d/D≦0.950;

When performing the on-site vitrification conversion, the base body 11 is inserted into the soil containing the vitrification promoter, so that the soil enters the inner space of the conduction rod 15 through the feed channel 112 and contacts the conduction rod 15 The induction coil 14 can receive alternating current to generate electromagnetic induction, and then heat the conduction rod 15 so that the soil is heated to cause vitrification.

In addition, in order to avoid structural instability of the on-site vitrification conversion device during the process of inserting it into the soil, a metal top cover (not shown) with a plurality of threaded holes can be used to fix it. The positions of the screw holes correspond to the position of the screw 16 and allow the screw 16 to pass through. Therefore, the metal top cover can be set up on the top of the on-site vitrification conversion device along the screw 16 from top to bottom, and use a screw of an appropriate size. The cap is fixed to avoid displacement of the conduction rod 15, the first hollow tube 12, and the second hollow tube 13; after inserting the on-site vitrification conversion device into the soil, remove the nut and the metal top cover and place the induction coil 14 Into, the vitrification reaction can proceed.

Also, please refer to FIG. 2A, which shows another embodiment of the present invention, an on-site vitrification conversion device, which further includes one or more heat insulation sheets 17, which are hollow ring structures. And it is arranged below the first hollow tube 12 and the second hollow tube 13. Please refer to FIG. 2B, which is a top view of the assembled first hollow tube 12, second hollow tube 13, and heat insulating sheet 17 in this embodiment. The inner diameter R of the heat insulating sheet 17 is smaller than the first hollow tube The inner diameter d of the second hollow tube 13, so part of the heat insulation sheet 17 will protrude from the inner space of the second hollow tube 13 after assembly, which can be used to carry the conduction rod 15 and fix the position of the conduction rod 15, while being able to separate The conduction rod 15 and the carrying platform 110 prevent the carrying platform 110 from contacting with the conduction rod 15 and being affected by the high temperature of the conduction rod 15 and melting.

In the above embodiment, the conduction rod 15 is a hollow cylindrical body, but it is not used as a line. For example, the conductance rod 15 can also be one or more solid cylinders; After entering the inner space of the second hollow tube 13 through the feeding channel 11, one or more conduction rods 15 can be inserted into the soil, and then alternating current is provided to the induction coil 14 to generate electromagnetic induction, thereby heating the conduction rod 15 to make The soil undergoes a vitrification reaction when heated.

In another embodiment of the present invention, the on-site vitrification device may further include at least one monitoring unit, the monitoring unit is disposed inside the second hollow tube, and may be a temperature sensor, a timer, and The gas sensor can effectively monitor the temperature of the soil in the on-site vitrification conversion device 1, the heating time, and the gas components released during the reaction process to detect the temperature of the soil in the second hollow tube 13 , Heating time, and gas composition released during the reaction.

In addition, the on-site vitrification conversion device 1 further includes a control unit, which is electrically connected to the monitoring unit, and can be a microprocessor, a computer, or a smart phone for receiving information from the monitoring unit Then the output parameters of the alternating current can be adjusted to optimize the vitrification reaction.

In addition, according to the technical idea of the present invention, the on-site vitrification conversion device of the present invention can vitrify the contaminated soil to form quartz glass, soda lime glass, borosilicate glass, lead oxide glass, aluminosilicate glass, and oxide glass. Any of the harmless vitrified solids, and the vitrified solids can be recycled and reused as the glass aggregate component in the glass pitch composition to achieve the purpose of recycling contaminated soil.

Next, various detection methods used in the embodiments of the present invention will be described below.

"Soil Vitrification Taguchi Experiment"

Take 10g of soil as a sample, and the sample conditions use the four conditions of reaction time, moisture content, added amount of vitrification promoter, and reaction temperature as variable factors. The soil is divided into 9 groups by Taguchi test method and subjected to three-fold coverage (total 27 samples). Use the on-site vitrification conversion device of the present invention to vitrify the sample. After the vitrification is completed, the vitrified sample is crushed and ground into powder. Take 0.5g of glass powder and digest it with nitric acid, hydrochloric acid and hydrogen peroxide. After digesting the sample, use the inductively coupled plasma atomic emission spectrometer (ICP-OES) to measure the concentration of 8 heavy metals in the sample, and compare the extractable heavy metal concentrations before and after vitrification to determine the best conditions for vitrification.

"Total Extraction and ICP Detection"

In order to ensure that the vitrified soil sample can effectively solidify heavy metals, in the embodiment of the present invention, a heavy metal digestion and dissolution experiment is performed on the vitrified sample to verify that the sample will not dissolve heavy metals after vitrification. The digestion and dissolution method refers to the acid digestion method (NIEAM353.02C) provided by the Environmental Inspection Institute of the Environmental Protection Department of the Executive Yuan, and combined with the parameters of the equipment used, the digestion steps are as follows: Weigh 1.0g dry solid sample, add 2.0ml low-mercury nitric acid (HNO ₃ ：H ₂ O=1:1) and 5.0ml low-mercury hydrochloric acid (HCl:H ₂ O=1:4) and mix with the solid, then place The digester is heated and digested at 95℃ for 30min. After half an hour, let it cool down for 20min, immediately add 2.0ml hydrogen peroxide (30%) to make it react for 10min. After the reaction, place the digester (temperature setting 85℃) and proceed again. After digestion for 30min, after cooling down for 10min, add 2.0ml hydrogen peroxide (30%) again for 10min, and finally put it in the digester (temperature setting 85℃) for 30min digestion, and add deionized water for quantitative dilution. The digestion and dissolution results were detected by an inductively coupled plasma emission spectrometer (Optima ^TM 7000DV, ICP-OES).

"Air Pollution Sampling"

In order to ensure that the vitrification process does not cause environmental air pollution, in the embodiment of the present invention, an air capture device is installed in the process of vitrifying contaminated soil to capture particles in the air on the Pallflex®Air Monitoring Filters filter paper, and Pre-treatment and testing are carried out according to the dioxin and furan testing method (NIEAM805.00B) published by the Environmental Protection Agency.

"On-site vitrification conversion device heating test"

Usually the most serious heavy metal pollution will be concentrated in one place, such as estuary, pollution source discharge, and heavy metal pollution is usually located on the surface of the soil. In order to effectively address this pollution characteristic, the on-site vitrification conversion device of the present invention can be used. The surface soil is vitrified in the most polluted places, so as to achieve the effect of quickly stabilizing heavy metals directly on the spot without leaking. In addition, before the vitrification test, a pipe string sampler can be used to seal the soil surface to be reacted and vacuum-dried to adjust the moisture content of the soil surface.

Mix the vitrification promoter with the specific contaminated soil surface area to condition the soil, and then put it into the conditioned soil by the on-site vitrification conversion device for vitrification test, and test the heavy metals through total extraction and ICP Stability rate.

"Example 1-9"

In Examples 1 to 9, experiments were conducted to simulate soil vitrification. The simulated soil was to take 10g of quartz sand as the soil sample, and to each group of simulated soils were added the eight concentrations shown in Comparative Example 1 in Table 1. Heavy metals. (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn). The conditions of the samples used the four conditions of reaction time, water content, added amount of vitrification promoter, and reaction temperature as variable factors, and the soil was divided into 9 groups by Taguchi test method, and three replicates were performed (a total of 27 samples).

From the results shown in Table 1, it can be seen that the higher the reaction temperature of the group, the more complete the degree of vitrification, and the dissolution rate of heavy metals will decrease accordingly, as in Example 6. The addition of vitrification agent should not be too much, otherwise it will reduce the result of vitrification, and moderate drug dosage can achieve better vitrification. The best condition is Example 8, but the lower temperatures of Examples 5 and 6 also have ideal vitrification results. This result shows that the reaction temperature for the vitrification reaction does not need to be 1600°C, which can effectively stabilize heavy metals. It can reduce the energy consumption for on-site vitrification experiments.

"Example 10-18"

The vitrification reaction was carried out under the conditions shown in Table 2 for the soil in the contaminated soil area of Taichung City, and the result data was recorded in Table 2.

From the results in Table 2 above, it can be seen that the soil vitrification results performed in Examples 10-18 are consistent with the simulated soil vitrification results performed in Examples 1-9, and heavy metals can be reliably stabilized. Then, draw a factor response diagram from the data of the Taguchi experiment above; for example, Figure 3A is the soil The factor response diagram of the removal rate of copper (Cu) in the soil, Figure 3B is the factor response diagram of the S/N ratio (signal to noise ratio) of copper (Cu) in the soil, and the factor response diagram of the zinc (Zn) in the soil in Figure 4A. Figure 4B is the factor response graph of the S/N ratio (signal-to-noise ratio) of zinc (Zn) in the soil; A represents the reaction temperature, B represents the moisture content, C represents the amount of glass accelerator added, D represents the reaction time, the numbers 1, 2, and 3 respectively represent 3 levels of variation. The detailed parameter values are shown in Table 3.

According to the results of the factor response diagram, we can further know the effect of each parameter on vitrification, and then convert the best parameter combination for vitrification into a reaction temperature of 1400°C, a water content of 0%, and a low chemical addition amount (1.6g of carbonic acid) Sodium, and 2.2g calcium carbonate), and the reaction time is 90 seconds.

In addition, during the vitrification reactions in Examples 10 to 18, air pollutants were sampled and analyzed for dioxin-like substances at the same time. The results are shown in Table 4, which is the toxic equivalent mass before dividing by the extracted air volume. .

The comparison of the toxicity equivalent concentration in the air after removing the extracted air volume with the current regulatory standards is shown in Table 5:

Comparing the results in Table 4 and Table 5, we can see that the total amount of toxic substances produced during the vitrification reaction is 99.3ITEQ-pg/Nm ^{3, which is} far lower than the newly established pollution source emission standard, and there is no need to increase air pollution for this procedure. Prevention equipment.

In addition, the concentration of heavy metals after treatment obtained in Examples 10 to 18 is compared with the control standards for soil pollutants in edible crops and agricultural land. The comparison results are shown in Table 6, where Y means that the control standard is passed, and N means that the control standard is not passed.

It can be seen from the results in Table 6 that only Examples 10, 12, and 18 did not pass the control standards, and the remaining examples all passed the control standards.

It can be confirmed from the results of the above examples that the on-site vitrification conversion device of the present invention can immediately perform vitrification of contaminated soil at the contaminated site, and obtain safe, stable and harmless vitrified soil that meets the general industrial waste standards.

"Example 19" (Glass Asphalt Concrete Analysis)

In this embodiment, the vitrification product obtained through the above-mentioned Example 19 of the present invention is used for asphalt concrete, and the effect analysis of the addition amount of different vitrification products on asphalt concrete is discussed. The composition ratio of each sample is shown in Table 7, and AC-20 asphalt mortar was used.

According to the "Chapter 02748 Glass Asphalt Concrete Pavement" announced by the Public Works Committee of the Executive Yuan, the vitrification product made by the vitrification reaction of heavy metal contaminated soil is recovered and crushed, passed through the No. 4 sieve, and then made into fine particles Mix the asphalt concrete with other granular materials that meet the specifications, asphalt mortar, and fillers to form asphalt concrete, and make a cylindrical test body for single pressure test.

The single pressure test is carried out with the Marshall design method, and two data of stability value (Va) and mobility value (VMA) will be obtained. The stability value can reflect the tensile strength and resistance of the asphalt, and the mobility value can reflect the ability to shape, if the fluidity value is higher, it means that the asphalt is easy to deform, and the lower the fluidity value is, it will reflect the asphalt It lacks flexibility and is not easy to shape during construction.

The asphalt concrete prepared for the test must comply with the "Chapter 02741 General Requirements for Asphalt Concrete" announced by the Public Works Committee of the Executive Yuan. Therefore, the granular material grading must meet the quality requirements of coarse-graded asphalt concrete. In this embodiment, the selected coarse gradation type is 19.0 mm (3/4 in.), and the sieving percentage table of each test body gradation is shown in Table 8.

The characteristics of each specimen and the numerical results of the stability value (Va) and the fluidity value (VMA) obtained by the single pressure test with the Marshall design method and their standard values are shown in Table 9. The relationship between VMA and the relative change of different test objects is plotted as a graph.

Figure 5A is the variation curve of the stability value (Va) of the specimens A0, A5, A10, and A15, and Figure 5B is the variation curve of the mobility value (VMA) of the specimens A0, A5, A10, and A15; Figure 6A is the variation curve of the test specimens A0, A5, A10, and A15. The variation curve of the stability value (Va) of the body B0, B5, B10 and B15, Figure 6B is the variation curve of the fluidity value (VMA) of the test body B0, B5, B10 and B15; Fig. 7A is the test body C0, C5 , C10 and C15 stable value (Va) change curve, Figure 7B is the test body C0, C5, C10 and C15 mobility value (VMA) change curve.

From the results in Table 9, Fig. 5A, Fig. 5B, Fig. 6A, Fig. 6B, Fig. 7A, and Fig. 7B, it can be seen that with 5% glass addition, the stability value of the asphalt specimen can be increased, and it has the highest stability value , But as the amount of glass increases, the stability value will gradually decrease, and the tensile capacity of the specimen will gradually decrease. In the part of fluidity, it can be known that as the amount of glass added increases, the fluidity value will gradually decrease, which means that the specimen is less easily deformed and also lacks flexibility. , At least C5 can reach the standard value in all the samples. It can be seen from the curve relationship that this part can be overcome by adding bitumen oil slightly.

In summary, according to the above-mentioned embodiment, it can be confirmed that the in-situ vitrification conversion device disclosed in the present invention has an induction coil set between two hollow tubes, which will not contact the soil and can avoid induction. The coil is affected by the soil, and is buried in the soil so that the soil enters the inside of the second hollow tube and then heated with a graphite rod. This method can ensure that the soil is heated evenly and achieve a good vitrification effect in a short time. Not only can it improve the above-mentioned problems of the conventional technology, but it also has low energy consumption, cost saving, easy operation, conducive to site operations, and can be quickly and effectively processed. Pollution, safety, no harm to health, and excellent effects of not causing secondary environmental hazards. It can also turn contaminated soil resources into glass aggregates, which can be used in asphalt concrete, which has significant advantages such as greatly improving industrial utilization. Outstanding efficacy.

In summary, the content of the present invention has been exemplified by the above embodiments, but the present invention is not limited to these embodiments. Those with ordinary knowledge in the technical field of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention; for example, combining or changing the various technical contents illustrated in the foregoing embodiments It becomes a new embodiment, and these embodiments are of course regarded as the content of the present invention. Therefore, the scope of protection in this case also includes the scope of patent application and its defined scope described later.

1: On-site vitrification conversion device

11: Base body

110: loading platform

111: feed channel

12: The first hollow tube

13: The second hollow tube

14: induction coil

15: Conductivity rod

16: screw

Claims (10)

An on-site vitrification conversion device, which is used to heat the soil of a local highly polluted area at a polluted site for vitrification. The on-site vitrification conversion device at least includes a base body, a first hollow tube, and a second center. An empty tube, an induction coil, and a conductive rod; wherein the base body is an inverted cone-shaped hollow body with a loading platform at the upper end and a feed channel at the lower end, the feed channel can allow the soil to enter; the first hollow The tube and the second hollow tube system are arranged on the loading platform, and the first hollow tube is sleeved on the outside of the second hollow tube; the induction coil is wound around the outer periphery of the second hollow tube, Used to receive an alternating current to generate electromagnetic induction; the conduction rod is arranged inside the second hollow tube and is in contact with the soil, and can heat and rise by the induced current to cause the soil to vitrify; the density of the induction coil is In the range of 0.4~0.8 circle/cm, it can receive AC with an output voltage of 110~380V, a current of 50A or more, and a frequency of 1.0KHz or more, and the heating rate of the conductance rod is in the range of 40~100℃/sec. And when performing in-situ vitrification conversion, insert the in-situ vitrification conversion device into the soil, so that the soil enters the inner space of the second hollow tube through the feed channel, and is in contact with the conduction rod, the induction coil After receiving the alternating current to generate electromagnetic induction, the conduction rod is then heated, so that the soil is heated to cause vitrification. The in-situ vitrification conversion device described in claim 1, wherein the conductance rod is a hollow cylinder and is arranged inside the second hollow tube, and the soil enters the internal space of the conductance rod through the feed channel and Vitrification occurs when heated. The on-site vitrification conversion device described in claim 2, which further includes at least one heat-insulating sheet, the heat-insulating sheet has a ring structure, and the bottoms of the first hollow tube and the second hollow tube are provided , Used to isolate the conduction rod and the loading platform. The in-situ vitrification conversion device described in claim 1, further comprising at least one monitoring unit, the monitoring unit is set inside the second hollow tube for detecting the soil in the inside of the second hollow tube The temperature, heating time, and gas composition released during the reaction. For example, the on-site vitrification conversion device described in claim 4 further includes a control unit, and the control unit is electrically connected to the monitoring unit. A glass asphalt composition comprising at least 1 part by weight to 15 parts by weight of glass aggregates, 80 parts by weight to 100 parts by weight of sand and gravel, 4.0 parts by weight to 5.5 parts by weight of asphalt mortar, and 2 parts by weight of filling Wherein the glass aggregate is a vitrified solid material formed by heating contaminated soil for vitrification by using the on-site vitrification conversion device as described in any one of claims 1 to 5. The glass pitch composition according to claim 6, wherein the contaminated soil further contains a vitrification promoter, and the vitrification promoter includes glass sand, iron sand, sodium oxide, calcium oxide, magnesium oxide, aluminum oxide, and sodium carbonate , Calcium carbonate, and at least one selected from their mixtures. The glass pitch composition according to claim 7, wherein the total added amount (Gw) of the vitrification promoter is relative to the total amount of the contaminated soil (Sw), when measured by weight, Sw: Gw is 20 : The range of 1 to 1:20. The glass pitch composition according to claim 6, wherein the moisture content of the contaminated soil is below 10%. The glass pitch composition according to claim 6, wherein the water absorption of the glass pitch composition is in the range of 0.5 to 3.0%, and the density is in the range of 2000 to 2400 Kg/m ³ .

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