CN112834416A - Road material harmful component leaching device for simulating rainwater environment and leaching method thereof - Google Patents
Road material harmful component leaching device for simulating rainwater environment and leaching method thereof Download PDFInfo
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Abstract
The invention discloses a leaching device and a leaching method for harmful components of road materials simulating a rainwater environment. The leaching device comprises a liquid storage container, a water pump, a leaching container and a collecting container which are sequentially connected, wherein: the leaching container is a cylindrical container, the inner diameter is 10.5-11.5cm, and the height is at least 7 cm; a liquid inlet is arranged at the bottom of the side surface of the leaching container, and a liquid outlet is arranged at the side surface opposite to the side surface where the liquid inlet is arranged. Preparing an extracting agent according to acid rain components in different areas, enabling the extracting agent to continuously and slowly flow through a road material sample from bottom to top, and simulating the washing and soaking of rainwater on a road; and (3) periodically analyzing the leaching components, and researching the leaching rule of harmful components in a rainwater environment to evaluate the environmental influence of the road material. The method can be used for analyzing the leaching behavior and potential hazard of the harmful components of the road material prepared from the solid wastes in the service period of the road surface, provides guidance for practical engineering application, and has the characteristics of strong adaptability, simple and convenient operation and the like.
Description
Technical Field
The invention belongs to the technical field of road engineering materials and rainwater pollution prevention and control, and particularly relates to a leaching device and a leaching method for harmful components of a road material simulating a rainwater environment.
Background
By 2019, the total road mileage in China reaches 501.25 kilometers, and is increased by 16.60 kilometers compared with the past year. The road construction supports the rapid development of the transportation industry and brings about a great amount of natural sandstone aggregate resource consumption. With the increasing of ecological environmental awareness of people, the green development becomes a necessary choice for various industries. In recent years, natural sandstone aggregates are gradually limited and forbidden to be mined, and solid wastes such as tailing slag, construction waste and the like are actively utilized to replace the natural aggregates, so that the natural sandstone aggregates become one of the main ways for green transformation in the road engineering industry. However, there is a doubt about whether the recycling of solid wastes such as tailing slag and construction waste as road materials is really green and environment-friendly. The tailings slag such as steel slag, copper slag and the like may contain various heavy metal elements, and the construction waste such as waste asphalt mixture recovered from road surfaces and the like may contain various harmful substances accumulated in the service process for a long time. In recent years, the frequency of acid rain in China is gradually increased, and the leaching behavior of the harmful substances in an acid rain environment is worthy of attention and research during road service.
The existing environmental protection industry standards of the sulfuric acid-nitric acid method (HJ/T299-2007) and the acetic acid buffer solution method (HJ/T300-2007) for the toxic leaching method of the solid waste are used for the toxic leaching identification of the solid waste and the reuse products, organic matters and inorganic matters thereof. The method is different from the environment in which the invention is applied, wherein the acetic acid buffer solution method is used for simulating the process of leaching harmful components in industrial waste from the waste under the influence of landfill leachate by taking the acetic acid buffer solution as a leaching agent.
The 'sulfuric acid-nitric acid method' is a process of leaching harmful components from waste under the influence of acid rainfall when the waste is reused after harmless treatment by taking a nitric acid/sulfuric acid mixed solution as a leaching agent. The main process is that the lixiviant is mixed with a sample to be tested according to a certain mass ratio (20:1 or 10:1), and the mixture is continuously vibrated for 18 plus or minus 2 hours at a certain temperature. However, this method has the following disadvantages when used for the study of the leaching process of road materials:
(1) rainfall and acid rain components of different regions are different and can be divided into nitric acid type acid rain and sulfuric acid type acid rain, and the research on solid wastes of different regions cannot be considered in a short time;
(2) for the road material, the service period can be as long as decades, the mass ratio of the total precipitation to the road material during the service period is far higher than 20:1, and because the components of solid wastes are complex, the leaching of different components has a certain sequence, a certain harmful component possibly has no leaching risk in most of time, the leaching is concentrated only in a certain time period, so that the environmental hazard is caused, and the phenomenon can be covered by completing the leaching process at one time by using a high liquid-solid ratio;
(3) the leaching process of road materials needs to be researched, and the leaching behavior of asphalt concrete or cement concrete needs to be involved. Different from loose solid waste particles, the concrete is a test block with a certain framework structure prepared by a compaction process, the mass is generally not lower than 1kg, and the requirement of 50-100g of the sample mass in the sulfuric acid-nitric acid method for leaching toxicity from solid waste is not met;
disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a road material harmful component leaching device for simulating a rainwater environment and a leaching method thereof, so as to analyze the leaching process of a road material under rainwater scouring and soaking during service, is suitable for various road material samples prepared in a laboratory and core samples collected on the road surface on site, can flexibly adjust experimental parameters to simulate the leaching behavior of different types of road materials under a specific rainfall environment, can be used for analyzing the leaching behavior and potential hazard of road material harmful components prepared from solid wastes during service of the road surface, provides guidance for practical engineering application, and has the characteristics of strong adaptability, simple and convenient operation and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a road material harmful component leaching device of simulation rainwater environment, includes stock solution container, water pump, leaches container and collection container, wherein:
the leaching container is a cylindrical container, the inner diameter of the leaching container is 10.5-11.5cm, and the height of the leaching container is at least 7 cm; a liquid inlet is formed in the bottom of the side face of the leaching container, and a liquid outlet is formed in the side face opposite to the side face where the liquid inlet is formed;
the liquid storage container, the water pump, the leaching container and the collecting container are sequentially connected, the water pump is connected with a liquid inlet of the leaching container, and a liquid outlet of the leaching container is connected with the collecting container.
According to the scheme, the liquid storage container is used for storing the prepared leaching agent.
According to the scheme, the flow rate of the water pump is adjustable and stable, and the flow rate range is 0-100.0 mL/min.
According to the scheme, at least one liquid outlet is arranged in the leaching container, the height of the first liquid outlet from the bottom of the leaching container is 6.5-7.5cm, and the spacing distance between the adjacent liquid outlets is 6.5-7.5 cm.
According to the scheme, the capacity of the liquid storage container is 5-50L; the capacity of the collecting container is 1-10L.
According to the scheme, the liquid storage container, the water pump, the leaching container and the collecting container are sequentially connected through rubber pipes.
According to the scheme, the liquid storage container, the leaching container and the collecting container are all containers with covers.
According to the scheme, the liquid inlet and the liquid outlet are both provided with valves.
The leaching method for the harmful components of the road material for simulating the rainwater environment by adopting the leaching device comprises the following steps:
1) preparing a cylindrical sample of the road material, wherein the diameter of the cylindrical sample is 9.5-10.5cm, and the cylindrical sample is placed at the bottom of the leaching container;
2) according to a rainwater quality detection report issued by a local meteorological bureau or actually collected rainwater, performing component analysis, preparing a rainwater simulation solution as an extracting agent according to the proportion of the pH value of the rainwater simulation solution to the content of acidic substances in the rainwater simulation solution, and pouring the extracting agent into a liquid storage container;
3) setting the flow rate of a water pump, opening a liquid inlet valve of the leaching container and a liquid outlet valve closest to the upper surface of the cylindrical sample, starting the water pump, continuously conveying the leaching agent from the liquid storage container to the leaching container through the liquid inlet at a constant speed, infiltrating the cylindrical sample from bottom to top, and conveying the leaching agent from the leaching container to a collection container through a liquid outlet;
4) the components of the road material are sampled from the collecting container periodically to be analyzed, the leaching rule of the road material under different environments can be analyzed by comparing the leaching concentrations of different experimental conditions and different time nodes, and the potential environmental hazard of the road material is analyzed by comparing the result with the related national standard.
According to the scheme, in the step 1), the cylindrical sample of the road material is prepared by the following specific method:
for asphalt concrete, preparing a cylindrical Marshall sample according to the requirements of road engineering asphalt and asphalt mixture test procedures (JTGE 20-2011); for cement concrete or other types of road materials, sampling from the plate-shaped test piece by using a core drilling machine to obtain a cylindrical test sample; for the pavement material in service, a core drilling machine is directly used for obtaining a cylindrical sample on the pavement.
The diameter of the cylindrical sample is recommended to be 9.5-10.5cm, and samples with a diameter > 11cm cannot be placed in the container. For cylindrical samples with small diameter or samples with other shapes, although experiments can be carried out, the leaching effect is poor due to the large difference between the size and the experimental device. The prepared samples are placed at the bottom of the leaching container, and the number of the placed samples can be determined according to the experimental content.
According to the scheme, in the step 1), at least one cylindrical sample is adopted.
According to the scheme, in the leaching process, the pH value of the leaching agent in the liquid storage container is monitored, and a new leaching agent is periodically supplemented or replaced to ensure the stability of the components of the leaching agent. The acid substances in the rainwater are generally nitric acid and sulfuric acid, and considering that the nitric acid is volatile, and the leaching agent required by the longer experimental process has larger capacity, the leaching agent is periodically supplemented or replaced by new leaching agent to ensure the stability of the components of the leaching agent.
According to the scheme, in the step 3), the flow rate of a water pump is 1-20 mL/min. And selecting a proper water pump flow rate according to the experimental content, wherein the slower the flow rate, the more sufficient the leaching effect is, but the longer the experimental time is. The leaching effect and the experimental efficiency are comprehensively considered, the flow rate is recommended to be selected within the range of 1-20mL/min, and the specific numerical value can be calculated according to the local annual average precipitation and the leaching time length required by the experiment.
According to the scheme, in the step 4), the leaching time length and the leaching agent collection interval time are flexibly selected according to different purposes.
According to the scheme, in the step 4), the contents of different components of the leaching agent in the collecting container are measured by an atomic absorption spectrometer, a plasma emission spectrometer or an ion chromatograph: preferably, the components to be detected comprise Mn, V, As, Pb, Cu, Cd.
The invention provides a leaching device and a leaching method for a road material to simulate a rainwater environment, which are attached to the leaching process of a real road under rainwater washing and soaking, on one hand, the uniform and natural infiltration of a pavement sample by an extractant is controlled by adjusting the flow of a water pump, and the components and the flow rate of the extractant can be flexibly adjusted according to the rainwater components and rainfall in different areas, so that the leaching effect is further close to the real situation. On the other hand, the flow direction of the leaching agent in the invention is from bottom to top, the leaching agent is conveyed into the leaching container through a liquid inlet at the bottom of the side surface of the leaching container, and the sample is infiltrated from the bottom to the top. The biggest difference between the test sample and the actual pavement is the upper surface area, the actual pavement coverage area is wide, rainfall is also uniform, most of the pavement is uniformly soaked by rainwater, the area of the experimental sample is small, and if a leaching agent is input from top to bottom, most of the rainwater probably flows down along the side wall of the sample, and effective leaching is not achieved. The leaching agent is enabled to permeate the sample from bottom to top, so that the sample can be ensured to be always kept in a uniform infiltration state, the leaching effect is ensured, meanwhile, the uniform flowing of the leaching agent is facilitated, and the leaching components are timely taken away from the leaching container from the liquid outlet. In addition, the fact that the leaching effect is greatly different from the real situation due to the fact that the direction of the water flow is opposite is not necessary to be worried, because in the aqueous solution, the strength of the electrostatic force among ions is far larger than the gravity force applied to the ions, namely the change of the ion behavior caused by the change of the direction of the water flow can be ignored.
In addition, the leaching container, the water storage container and the collecting container are separated, so that the experimental space is saved, and the leaching effect is also ensured. Many decades of cycles are considered to study the service behavior of road materials. For areas with large rainfall, the accumulated rainfall can reach more than 100 times of the road material quality within decades. The road material has a certain skeleton structure, and the mass of a sample for researching the road material is usually more than 1 kg. It is conventionally necessary to prepare 100L containers for leaching experiments, and even if a sufficiently large container is prepared, it is difficult to ensure that a sufficient amount of leaching agent is in contact with the sample. The method ensures that the slow water flow penetrates through the sample, the leaching agent flowing out of the collecting container can be discarded after sampling, and the leaching agent only needs to be supplemented into the liquid storage container periodically, thereby saving a large amount of experimental space and ensuring that all the leaching agent is in full contact with the sample.
The invention has the following beneficial effects:
1. the leaching device provided by the invention comprises a liquid storage container, a water pump, a leaching container and a collecting container, wherein the bottom of the side surface of the leaching container is provided with the liquid inlet, so that an extracting agent can permeate a sample from bottom to top, the sample is always kept in a uniform soaking state, and the leaching effect is ensured; the uniform and natural infiltration of the road surface sample by the leaching agent can be controlled by adjusting the flow of the water pump, and in addition, the components and the flow rate of the leaching agent can be flexibly adjusted according to the rainwater components and rainfall in different areas, so that the leaching effect is further close to the actual situation; the device disclosed by the invention is simple, saves experimental space, reduces cost, is more suitable for the leaching process of a real road under rain wash and immersion, is suitable for various road material samples prepared in a laboratory and core samples collected on the site of the road surface, has strong applicability, can be used for analyzing the leaching behavior and potential hazard of harmful components of the road material prepared from solid wastes during the service period of the road surface, and provides guidance for practical engineering application.
2. The invention can be used for carrying out uniform and slow infiltration on a pavement material sample, cannot impact the structure of the sample, is suitable for a pavement material with a certain framework structure and pores, can also be used for researching the relation between the material structure and the leaching effect, and is used for simulating the leaching performance change of different types of pavement materials or the leaching performance change of the pavement materials caused by the structural change of pavement diseases at different stages of service.
3. The wall of the leaching container is provided with liquid outlets with different heights, so that the liquid outlet device is suitable for samples with different heights, and different road surface conditions can be simulated more truly.
4. Because the leaching agent is stored in the liquid storage container and can be updated regularly, the experimental period can be infinitely prolonged theoretically, and the experimental process can be flexibly designed; the leaching process can be flexibly suspended, or leaching conditions can be adjusted, even a sample is subjected to other treatments and then a leaching experiment is continued, the change of the leaching performance before and after the treatment is observed, and the whole leaching process does not need to be repeated again.
Drawings
FIG. 1 is a schematic diagram of a road material leaching test device for simulating a rainwater environment in an embodiment of the invention; reference numbers in the figures: 1-liquid storage container, 2-rubber tube, 3-water pump, 4-leaching container, 5-collecting container, 6-sample, 7-liquid inlet and 8-liquid outlet.
FIG. 2 shows the leaching concentrations of V and As As a function of time in the example of the present invention.
Detailed Description
The invention provides a method for leaching harmful components of a road material by simulating a rainwater environment. In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
As shown in fig. 1, the embodiment of the present invention provides a road material harmful component leaching device simulating a rainwater environment, comprising a liquid storage container 1, a water pump 3, a leaching container 4 and a collecting container 5, wherein:
the leaching container 4 is a cylindrical container, the inner diameter is 10.5-11.5cm, the height is at least 7cm, a liquid inlet 7 is arranged at the bottom of the side surface, and a liquid outlet 8 is arranged on the side surface opposite to the side surface where the liquid inlet 7 is located;
In one embodiment, the reservoir 1 is used to store the prepared leaching agent.
In one embodiment, the flow rate of the water pump 3 is adjustable and stable, and the flow rate ranges from 0mL/min to 100.0 mL/min.
In one embodiment, at least one of the liquid outlets 8 is arranged in the leaching container 4, the distance between the first liquid outlet and the bottom of the leaching container is 6.5-7.5cm, and the distance between the adjacent liquid outlets is 6.5-7.5 cm.
In one embodiment, the capacity of the liquid storage container 1 is 5-50L; the capacity of the collecting container 5 is 1-10L.
In one embodiment, the liquid storage container 1, the water pump 3, the leaching container 4 and the collecting container 5 are sequentially connected through a rubber tube 2.
In one embodiment, the reservoir 1, the extraction vessel 4 and the collection vessel 5 are all lidded vessels.
In one embodiment, the liquid inlet 7 and the liquid outlet 8 are provided with valves.
The embodiment of the invention provides a leaching method for simulating harmful components of road materials in a rainwater environment by adopting the leaching device, which comprises the following steps:
1) preparing a cylindrical sample 6 of the road material, the diameter of which is 9.5-10.5cm, and placing the cylindrical sample at the bottom of the leaching container 4;
2) according to a rainwater quality detection report issued by a local meteorological bureau or actually collected rainwater, performing component analysis, preparing a rainwater simulation solution as an extracting agent according to the proportion of the pH value of the rainwater simulation solution to the content of acidic substances in the rainwater simulation solution, and pouring the extracting agent into a liquid storage container 1;
3) after the flow rate of the water pump 3 is set, a liquid inlet valve of the leaching container 4 and a liquid outlet valve closest to the upper surface of the cylindrical sample are opened, the water pump is started, the leaching agent is continuously conveyed from the liquid storage container 1 to the leaching container 4 through a liquid inlet 7 at a constant speed, the cylindrical sample 6 is soaked from bottom to top, and then the leaching container 4 is conveyed to the collecting container 5 through a liquid outlet 8;
4) the components of the road material are sampled from the collecting container 5 periodically to be analyzed, the leaching rule of the road material under different environments can be analyzed by comparing the leaching concentrations under different experimental conditions and different time nodes, and the potential environmental hazard of the road material is analyzed by comparing the result with the relevant national standard.
In one embodiment, in the step 1), the preparation of the cylindrical sample of the road material comprises the following steps:
for asphalt concrete, preparing a cylindrical Marshall sample according to the requirements of road engineering asphalt and asphalt mixture test procedures (JTGE 20-2011); for cement concrete or other types of road materials, sampling from the plate-shaped test piece by using a core drilling machine to obtain a cylindrical test sample; for the pavement material in service, a core drilling machine is directly used for obtaining a cylindrical sample on the pavement.
In one embodiment, in step 1), at least one cylindrical sample is used.
In one embodiment, the pH of the lixiviant in the reservoir 1 is monitored during the leaching process, and fresh lixiviant is periodically replenished or replaced to ensure that the lixiviant components are stable.
In one embodiment, in the step 3), the flow rate of the water pump 3 is 1-20 mL/min.
In one embodiment, in the step 4), the leaching time length and the leaching agent collection interval time are flexibly selected according to different purposes.
In one embodiment, in the step 4), the contents of different components of the leaching agent in the collecting container 5 are measured by an atomic absorption spectrometer, a plasma emission spectrometer or an ion chromatograph, wherein the components to be detected include Mn, V, As, Pb, Cu and Cd.
Example (b):
taking steel slag asphalt concrete as an example, the leaching rule of the steel slag asphalt concrete in the service process of Wuhan city in Hubei province and Wuhan city under the rainwater environment is researched:
(1) preparing an experimental device: A10L water tank was prepared as a liquid storage container 1, a 5L measuring cup with a cap was prepared as a collection container 5, a cylindrical glass container with a cap having an inner diameter of 11cm and a height of 25cm and having a liquid outlet 8 at every 7cm was prepared as a leaching container 4, and a water pump 3 having a flow rate of 0 to 100.0mL/min was prepared. The experimental device is connected by a rubber tube 2 according to the figure 1;
(2) preparing a steel slag asphalt concrete sample: steel slag, steel slag powder and SBS modified asphalt are used as raw materials, and a cylindrical steel slag asphalt concrete sample is prepared according to the requirements of road engineering asphalt and asphalt mixture test procedures (JTG E20-2011). The volume parameters are shown in table 1.
TABLE 1 volume parameters of steel slag asphalt concrete samples
Placing a prepared steel slag asphalt concrete sample at the bottom of the leaching container 4, opening a liquid outlet valve with the height of 7cm, closing other liquid outlet valves, and opening a liquid inlet valve at the bottom;
(3) preparing an extracting agent: the mass ratio of sulfuric acid to nitric acid is 1: 1, mixing with a certain amount of deionized water, and preparing a rainwater simulation solution with the pH value of 4.5 as an extracting agent. The prepared lixiviant is put into a 10L liquid storage container 1, the liquid storage container 1 is cleaned every 24h and the lixiviant is replaced in the experimental process, so as to ensure the stability of the components of the lixiviant used in the experiment;
(4) setting the flow rate of the water pump 3: according to the average annual precipitation of about 1200mm in Wuhan city of Hubei province and the consumption of about 600kg/m of asphalt concrete on a unit area of a 20cm thick asphalt pavement2And calculating that the mass ratio of the rainfall borne by the road surface per unit area in one year to the road material per se is about 2: 1. The water-solid ratio of leaching every 12h is planned to be 2: the experiment was carried out at a rate of 1, i.e. every 12 hours a leaching process of asphalt concrete by rainfall was simulated for one year. The sample mass was 1.288kg, and 2.576L of lixiviant was delivered every 12h, so the flow rate of the water pump 3 was set to 3.6 mL/min. Starting a water pump 3 to start a leaching experiment;
(5) collecting a leaching agent: uniformly stirring the leaching agent in the collection container 5 every 6h, and taking a small amount of leaching agent samples by using a rubber head dropper to perform component analysis on the leaching agent samples by using a plasma emission spectrometer. And simultaneously, cleaning the collecting container, and collecting the leaching agent in the next round. In order to simulate the leaching process of the road material within 10 years of service, the experiment needs 120 hours, and lixiviant samples are collected for 10 times;
(6) and (3) analyzing an experimental result: the experimental data were collated to obtain the leaching concentrations of various elements of the steel slag asphalt concrete after leaching in the simulated rainwater environment for different years, as shown in table 2.
TABLE 2 leaching concentration (unit: g/mL) of each element after leaching of steel slag asphalt concrete in simulated rain environment for different years
To analyze the time-dependent behavior of the detected leaching concentrations of V and As and to analyze their potential hazards, the experimental data can be arranged into a line graph and compared to the relevant requirements in the national standards, As shown in fig. 2. It can be seen that the leaching concentrations of both V and As decreased with increasing leaching time. The leaching concentration of As is greatly reduced, but the initial stage can exceed the limit value of the concentration of As in surface water in the 'surface water environment quality standard', so that the potential hazard of leaching As in the steel slag asphalt concrete in the initial stage of service is judged to be high, and strict control is required. The reduction range of the leaching concentration of V is small, but the difference between the V concentration and the concentration limit value in the emission Standard of vanadium Industrial pollutants (GB 26452) 2011 is large, and the concentration of the V is not limited by the environmental quality Standard of surface Water, so that the harmfulness of the V leached in the service process of the steel slag asphalt concrete can be judged to be small.
The road material simulated rainwater environment leaching method provided by the invention is not limited to asphalt concrete, and is also suitable for different types of road material samples with appropriate sizes. And the values of parameters (such as lixiviant components, flow rate and the like) in each experimental step can be adjusted according to actual conditions (such as local acid rain components, precipitation and the like), which are not listed. Therefore, the present invention is not limited to the above-described embodiments, and improvements and modifications made without departing from the scope of the invention should be within the scope of the invention.
Claims (10)
1. The utility model provides a road material harmful components leaching device of simulation rainwater environment which characterized in that, includes stock solution container, water pump, leaches container and collection container, wherein:
the leaching container is a cylindrical container, the inner diameter of the leaching container is 10.5-11.5cm, and the height of the leaching container is at least 7 cm; a liquid inlet is formed in the bottom of the side face of the leaching container, and a liquid outlet is formed in the side face opposite to the side face where the liquid inlet is formed;
the liquid storage container, the water pump, the leaching container and the collecting container are sequentially connected, the water pump is connected with a liquid inlet of the leaching container, and a liquid outlet of the leaching container is connected with the collecting container.
2. The leaching apparatus according to claim 1, wherein the water pump flow rate is adjustable and stable, and is in the range of 0-100.0 mL/min.
3. The leaching apparatus as claimed in claim 1, wherein there is at least one exit port, the first exit port being spaced from the bottom of the leaching vessel by a height of 6.5-7.5cm, and adjacent exit ports being spaced by a distance of 6.5-7.5 cm.
4. The leaching apparatus according to claim 1, wherein the reservoir has a capacity of 5-50L; the capacity of the collecting container is 1-10L.
5. The leaching apparatus according to claim 1, wherein the reservoir, the pump, the leaching vessel and the collection vessel are connected in sequence by hoses.
6. The leaching apparatus according to claim 1, wherein the reservoir, leaching vessel and collection vessel are lidded vessels; the liquid inlet and the liquid outlet are both provided with valves.
7. A method of leaching harmful components of road materials using a leaching apparatus according to any one of claims 1 to 6 for simulating a stormwater environment, comprising the steps of:
1) preparing a cylindrical sample of the road material, wherein the diameter of the cylindrical sample is 9.5-10.5cm, and the cylindrical sample is placed at the bottom of the leaching container;
2) according to a rainwater quality detection report issued by a local meteorological bureau or actually collected rainwater, performing component analysis, preparing a rainwater simulation solution as an extracting agent according to the proportion of the pH value of the rainwater simulation solution to the content of acidic substances in the rainwater simulation solution, and pouring the extracting agent into a liquid storage container;
3) setting the flow rate of a water pump, opening a liquid inlet valve of the leaching container and a liquid outlet valve closest to the upper surface of the cylindrical sample, starting the water pump, continuously conveying the leaching agent from the liquid storage container to the leaching container through the liquid inlet at a constant speed, infiltrating the cylindrical sample from bottom to top, and conveying the leaching agent from the leaching container to a collection container through a liquid outlet;
4) the components of the road material are sampled from the collecting container periodically to be analyzed, the leaching rule of the road material under different environments can be analyzed by comparing the leaching concentrations of different experimental conditions and different time nodes, and the potential environmental hazard of the road material is analyzed by comparing the result with the related national standard.
8. The leaching process according to claim 7, wherein in step 1), a cylindrical sample of the road material is prepared by:
for asphalt concrete, preparing a cylindrical Marshall sample according to the requirements of road engineering asphalt and asphalt mixture test procedures; for cement concrete or other types of road materials, sampling from the plate-shaped test piece by using a core drilling machine to obtain a cylindrical test sample; for the pavement material in service, a core drilling machine is directly used for obtaining a cylindrical sample on the pavement.
9. The process of leaching according to claim 7, wherein in step 1), there is at least one cylinder sample; in the step 3), the flow rate of a water pump is 1-20 mL/min; in the step 4), the content of different components of the leaching agent in the collecting container is measured by an atomic absorption spectrometer, a plasma emission spectrometer or an ion chromatograph.
10. A process as claimed in claim 7, wherein the pH of the lixiviant in the reservoir is monitored during the leaching process, and fresh lixiviant is periodically replenished or exchanged to ensure that the lixiviant components are stable.
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| CN114354881A (en) * | 2022-01-10 | 2022-04-15 | 中国原子能科学研究院 | System and method for measuring carbon/oxygen in alkali metal and method for replacing sensor |
| CN116558930A (en) * | 2023-03-16 | 2023-08-08 | 燕山大学 | Device and method for leaching toxic substances from inorganic binder stable solid waste materials |
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| CN114354881A (en) * | 2022-01-10 | 2022-04-15 | 中国原子能科学研究院 | System and method for measuring carbon/oxygen in alkali metal and method for replacing sensor |
| CN116558930A (en) * | 2023-03-16 | 2023-08-08 | 燕山大学 | Device and method for leaching toxic substances from inorganic binder stable solid waste materials |
| CN116558930B (en) * | 2023-03-16 | 2024-01-23 | 燕山大学 | Device and method for leaching toxic substances from inorganic binder stable solid waste materials |
| WO2024188013A1 (en) * | 2023-03-16 | 2024-09-19 | 燕山大学 | Device and method for leaching toxic substances in inorganic binder stabilized solid waste material |
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