Method and equipment for detecting natural release level of coal mine specific pollutants

Abstract

The invention relates to the technical field of detection, in particular to a method and equipment for detecting the natural release level of specific pollutants of a coal mine, and the method comprises the following steps: cutting, cleaning and airing a coal mine sample with target weight to obtain a pretreated sample; mixing the natural surface water of a first target volume of the detection land with the pretreatment sample to obtain a mixed solution, and placing the mixed solution in an outdoor environment test platform built in the field of the detection land to form a test group; placing the natural surface water of the detection land with the first target volume in an outdoor environment test platform built in the field of the detection land to form a blank group; respectively taking out a second target volume of liquid from the test group and the blank group at the same moment, and respectively testing the concentration of the specific pollutants; based on the concentration test results of the specific pollutants of the test group and the blank group at the same moment, the natural release level of the specific pollutants of the coal mine sample is determined, and the detection precision can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a method and equipment for detecting the natural release level of characteristic pollutants in coal mines. Background Art

[0002] In the process of coal mining and utilization, open-air piled coal and gangue are usually released into the soil under the chemical weathering of river and lake water and precipitation leaching, which are also inorganic non-metallic SO4 in local surface water and groundwater. 2- 、F - , B, As, etc. and metal elements Fe, Pb, etc. Since coal and gangue have different main mineral components, the levels of pollutant release are also different. The element release content of coal and gangue per unit mass is of great significance for studying the types and pollution levels of characteristic pollutants in soil and natural water bodies and environmental risk assessment.

[0003] In the existing technology, when studying the pollution release problem in coal-fired power clusters, it is necessary to obtain the unit mass pollutant release of coal and gangue in the coal mining area. In current research, indoor leaching tests are generally used to obtain the pollutant release of coal or gangue. However, there are many problems. For example, it is difficult to accurately restore the actual field conditions such as diurnal and seasonal changes in temperature and humidity in indoor tests or closed containers; the leaching liquid is usually pure water, which is inconsistent with the actual situation; and the leaching time is usually short, such as 18 hours, mostly on a day-week scale (however, the leaching of trace elements in nature is a long-term process, and only the concentration change trend provided by long-term leaching tests is scientific and credible). As a result, the existing technical solutions are difficult to reflect the actual situation of pollutant release. Therefore, how to more accurately detect the release level of characteristic pollutants in coal and gangue under the surface geochemical environment has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method and device for detecting the natural release level of characteristic pollutants in coal mines, so as to overcome the problem of poor accuracy in the current detection of natural release of characteristic pollutants in coal mines.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: In a first aspect, the present application provides a method for detecting the natural release level of characteristic pollutants in coal mines, comprising: Cutting, cleaning and airing the coal samples of target weight to obtain pre-processed samples; The first target volume of natural surface water from the detection site is mixed with the pretreated sample to obtain a mixed solution, and the mixed solution is placed in an open-air environmental test platform built in the field at the detection site to form a test group; the first target volume of natural surface water from the detection site is placed in an open-air environmental test platform built in the field at the detection site to form a blank group; At the same time, taking out a second target volume of liquid from the test group and the blank group, respectively, and performing concentration tests of characteristic pollutants on them respectively; Based on the concentration test results of the characteristic pollutants of the test group and the blank group at the same time, the natural release level of the characteristic pollutants of the coal mine sample is determined.

[0006] Further, in some embodiments of the present application, the target weight is 1 kg; The method of cutting, washing and airing the coal sample of target weight to obtain the pre-treated sample comprises: cutting and crushing 1 kg of the coal sample into 20-40 meshes, washing it with pure water for 3 times, and laying it flat to dry to obtain the pre-treated sample.

[0007] Furthermore, in some embodiments of the present application, the characteristic pollutants include SO42-, F-, As, Pb, Cd, Cr, Cu, Zn and B.

[0008] Further, in some embodiments of the present application, the natural release level of characteristic pollutants of the coal mine sample is determined based on the concentration test results of the characteristic pollutants of the test group and the blank group at the same time, including: Determining the total mass of the first characteristic pollutant based on the test concentration of the characteristic pollutant of the test group; and determining the total mass of the second characteristic pollutant based on the test concentration of the characteristic pollutant of the blank group; The difference between the total mass of the first characteristic pollutant and the total mass of the second characteristic pollutant is used as the natural release mass of the characteristic pollutant of the coal mine sample; The ratio of the natural release mass of the characteristic pollutants of the coal mine sample to the mass of the coal mine sample is taken as the natural release concentration of the characteristic pollutants of the coal mine sample.

[0009] Further, in some embodiments of the present application, taking out the second target volume of liquid from the test group and the blank group at the same time, respectively, comprises: At target time intervals, a second target volume of liquid is taken out from the test group and the blank group simultaneously for multiple times; And after taking out the second target volume of liquid each time, the second target volume of natural surface water at the detection site is added to the original liquid.

[0010] Furthermore, in some embodiments of the present application, it also includes: Based on the natural release concentration of characteristic pollutants of the coal mine sample at each moment, the variation pattern of the natural release concentration of characteristic pollutants of the coal mine sample over time is determined.

[0011] In a second aspect, the present application provides a device for detecting the natural release level of characteristic pollutants in coal mines, including a processor and a memory, wherein the processor is connected to the memory: Wherein, the processor is used to call and execute the program stored in the memory; The memory is used to store the program, and the program is at least used to execute the above-mentioned method for detecting the natural release level of characteristic pollutants in coal mines.

[0012] The present invention relates to the field of detection technology, and in particular to a method and device for detecting the natural release level of characteristic pollutants in coal mines. The method comprises: cutting, washing and airing a coal mine sample of a target weight to obtain a pre-treated sample; mixing a first target volume of natural surface water from a detection site with the pre-treated sample to obtain a mixed liquid, and placing the mixed liquid in an open-air environmental test platform built in the field at the detection site to form a test group; placing the first target volume of natural surface water from a detection site in an open-air environmental test platform built in the field at the detection site to form a blank group; taking out a second target volume of liquid from the test group and the blank group at the same time, and performing concentration tests of characteristic pollutants respectively; determining the natural release level of characteristic pollutants in the coal mine sample based on the concentration test results of the characteristic pollutants of the test group and the blank group at the same time, thereby greatly improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a flow chart of a method for detecting the natural release level of characteristic pollutants in coal mines provided in an embodiment of the present invention.

[0015] Figure 2 This is a partial data comparison chart of detection in the northwest region using the detection method for natural release levels of characteristic pollutants in coal mines provided by an embodiment of the present invention.

[0016] Figure 3 This is a partial data change diagram of a detection of the northwest region using the detection method for the natural release level of characteristic pollutants in coal mines provided by an embodiment of the present invention.

[0017] Figure 4 It is a schematic diagram of the structure of a device for detecting the natural release level of characteristic pollutants in coal mines provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0018] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0019] Figure 1 This is a flow chart of a method for detecting the natural release level of characteristic pollutants in coal mines provided by an embodiment of the present invention. Figure 1 , this embodiment may include the following steps: S101, cutting, cleaning and airing the coal samples of target weight to obtain pre-processed samples.

[0020] Specifically, coal mine samples include coal and gangue (coal and gangue can be tested separately). For the convenience of subsequent calculations, the target weight can be set to 1kg. At this time, 1kg of coal and gangue samples are cut and crushed into 20-40 meshes, then washed repeatedly with pure water for 3 times, and then spread flat to dry to obtain pre-treated samples. This step can remove floating and soluble salt components to ensure detection accuracy.

[0021] S102. Mix the first target volume of natural surface water from the detection site with the pretreated sample to obtain a mixed liquid, and place the mixed liquid in an open-air environmental test platform built outdoors at the detection site to form a test group; place the first target volume of natural surface water from the detection site in an open-air environmental test platform built outdoors at the detection site to form a blank group.

[0022] Specifically, the first target volume, for example, for a 1kg coal mine sample, can be set to 1L, and 1L of natural surface water from the test site (such as a coal mining area or a storage area) is mixed with the pretreated sample obtained above to obtain a mixed liquid, and the mixed liquid is placed in an open-air environmental test platform built outdoors at the test site to form a test group, which is used to determine the release of characteristic pollutants when coal and gangue react with natural water from the test site under natural conditions in the field.

[0023] In order to deduct the background value of natural surface water and further improve the detection accuracy, in the scheme provided in this application, a blank group is formed by not adding coal and gangue, and the other steps are the same as the test group steps, so as to eliminate the influence of the characteristic pollutants of natural water itself detected under natural conditions in the field obtained by the blank group in the subsequent detection, thereby improving the detection accuracy.

[0024] S103. At the same time, a second target volume of liquid is taken out from the test group and the blank group respectively, and concentration tests of characteristic pollutants are performed respectively.

[0025] S104. Determine the natural release level of characteristic pollutants of the coal mine samples based on the concentration test results of the characteristic pollutants of the test group and the blank group at the same time.

[0026] Specifically, in this application, characteristic pollutants may include SO4 2- 、F - , As, Pb, Cd, Cr, Cu, Zn and B. In the above concentration test, each characteristic pollutant can be measured to obtain the release level of each characteristic pollutant in the coal mine sample, and then the test results of all characteristic pollutants can be combined to obtain the release level of all characteristic pollutants in the coal mine sample.

[0027] The method for detecting the natural release level of characteristic pollutants in coal mines provided by the present invention comprises the following steps: cutting, washing and airing coal mine samples of a target weight to obtain pretreated samples; mixing a first target volume of natural surface water from a detection site with the pretreated samples to obtain a mixed liquid, and placing the mixed liquid in an open-air environmental test platform built outdoors at the detection site to form a test group; placing the first target volume of natural surface water from a detection site in an open-air environmental test platform built outdoors at the detection site to form a blank group; taking out a second target volume of liquid from the test group and the blank group at the same time, respectively, and performing concentration tests of characteristic pollutants on the respective groups; determining the natural release level of characteristic pollutants in coal mine samples based on the concentration test results of characteristic pollutants in the test group and the blank group at the same time, thereby greatly improving the detection accuracy.

[0028] Further, in the present application, based on the concentration test results of the characteristic pollutants of the test group and the blank group at the same time, the natural release level of the characteristic pollutants of the coal mine sample is determined, which may specifically include: First, the total mass of the first characteristic pollutants is determined based on the test concentration of the characteristic pollutants of the test group; and the total mass of the second characteristic pollutants is determined based on the test concentration of the characteristic pollutants of the blank group.

[0029] It should be noted that the total mass mentioned here refers to the total mass of one characteristic pollutant when the above-mentioned various characteristic pollutants need to be tested separately. Of course, when all characteristic pollutants are tested comprehensively, they can be integrated after obtaining the final results of each characteristic pollutant as mentioned above, or the masses of all characteristic pollutants can be integrated when measuring the total mass, which can be flexibly adjusted according to the actual test situation.

[0030] Specifically, the field leachate of the test group, i.e. the liquid taken out, was tested for pH (determining acidity and alkalinity) and SO4 2- 、F - , As, Pb, Cd, Cr, Cu, Zn, B concentration test, the test concentration and the volume before sampling the product as the total mass of the characteristic pollutants in the leachate, that is, the total mass of the first characteristic pollutant; and the field leachate of the blank group, that is, the liquid taken out, pH (to determine the acidity and alkalinity) and SO4 2- 、F - , As, Pb, Cd, Cr, Cu, Zn, and B concentration tests are conducted, and the product of the test concentration and the volume before sampling is taken as the total mass of the characteristic pollutants of the natural surface water itself, that is, the total mass of the second characteristic pollutants.

[0031] Then, the difference between the total mass of the first characteristic pollutant and the total mass of the second characteristic pollutant is taken as the natural release mass of the characteristic pollutant of the coal mine sample.

[0032] Specifically, the total mass of the first characteristic pollutant is subtracted from the total mass of the second characteristic pollutant to obtain the mass of the characteristic pollutant released by the coal mine sample, that is, the natural release mass of the characteristic pollutant of the coal mine sample.

[0033] Finally, the ratio of the natural release mass of characteristic pollutants in coal mine samples to the mass of coal mine samples is taken as the natural release concentration of characteristic pollutants in coal mine samples.

[0034] Specifically, the natural release mass of the characteristic pollutants of the coal mine sample obtained above is divided by the mass of the coal mine sample, such as 1 kg mentioned in the above embodiment, and finally the release concentration of the characteristic pollutants of the coal mine sample under natural conditions is obtained, that is, the natural release concentration of the characteristic pollutants of the coal mine sample, that is, the natural release level of the characteristic pollutants of the coal mine sample. It can be understood that the natural release concentration of the characteristic pollutants of the coal mine sample mentioned above is a mass concentration, and the unit can be mg / kg or μg / kg.

[0035] Furthermore, in the embodiment of the present application, the detection time can be greatly extended based on the open-air environment built in the field of the detection site as the test platform, so as to obtain more accurate detection information. Sampling can be carried out in the test group and the blank group on a monthly basis to observe the change of the natural release concentration of the characteristic pollutants over time, including taking out the second target volume of liquid from the test group and the blank group at the target time interval for multiple times and performing concentration tests; at the same time, after taking out the second target volume of liquid each time, the second target volume of natural surface water of the detection site is added to the original liquid; then based on the natural release concentration of the characteristic pollutants of the coal mine samples at each moment, the change law of the natural release concentration of the characteristic pollutants of the coal mine samples over time is determined.

[0036] Specifically, for example, for the above-mentioned test group and blank group, multiple samplings are performed at target time intervals, wherein at each sampling moment, the second target volume of liquid needs to be taken out from the test group and the blank group respectively, that is, the second target volume of liquid is taken out from the mixed liquid of the test group, and the second target volume of liquid is also taken out from the blank group, for calculating the natural release concentration of characteristic pollutants of the coal mine sample corresponding to the taking out moment. In some embodiments, sampling can be performed monthly with a target time interval of one month.

[0037] It should be noted that in the present application, the original liquid needs to be replenished after each sampling. For example, after taking out 300 mL of liquid, 300 mL of local natural water is added to the original solution to keep the coal mine sample reacting continuously, and then the taken liquid is tested.

[0038] On this basis, long-term sampling (such as 1-4 months, and of course longer time ranges) is used to determine the temporal changes in the natural release concentrations of characteristic pollutants in coal mine samples.

[0039] Because the release of pollutants in coal and gangue is usually closely related to the local temperature, humidity, dissolved oxygen content and pH. The leaching experiment in the prior art is to collect samples in the field and then take them indoors for leaching tests, which changes the environmental conditions for coal and gangue to be stored and weathered in the field, and the indoor test cannot simultaneously restore the local natural conditions such as day and night temperature difference, evaporation and rainfall. The detection method for the natural release level of characteristic pollutants in coal mines provided in this application changes the indoor leaching test to a field open-air environmental test, so that the test can provide changes in day and night temperature and humidity under natural conditions; at the same time, the leaching liquid is changed from pure water to local natural surface water, and because it is an open-air environmental test platform, it can accept natural rainwater leaching, thereby simulating the environmental conditions of coal mines stored and weathered in the field to the greatest extent.

[0040] And because the weathering of coal and gangue is closely related to the weathering time, the leaching of trace elements in nature is a long process. The method for detecting the natural release level of characteristic pollutants in coal mines provided in this application extends the leaching time through the above-mentioned scheme, such as establishing monitoring for several months, such as conducting monthly sampling, and obtaining the relationship between the monthly natural release concentration of characteristic pollutants and time, so as to make the results more rigorous and accurate.

[0041] Using the above scheme, an open-air environmental test platform was built in the field in Northwest my country to carry out a series of field leaching tests with leaching time gradients on coal and gangue samples from multiple coal mines in the Carboniferous-Permian and Jurassic systems in Northwest China, and to test the concentration of leachate to detect SO4 2- 、F - , B, As, Pb, etc., to obtain the release levels of characteristic pollutants in coal or gangue under natural conditions in the field, and to detect the changes in the release levels of these characteristic pollutants over time through monthly sampling methods, to obtain the relationship between the release levels of these characteristic pollutants and time. Figure 2 The figure shows the SO4 detected in various coal and gangue in the first month. 2- The natural release concentration of Figure 3 The figure shows the SO4 2- Changes in the natural release concentration.

[0042] Based on the same inventive concept, the present application also provides a device for detecting the natural release level of characteristic pollutants in coal mines, which is used to implement the above method embodiment. Figure 4 Schematic diagram of the structure of the detection device for the natural release level of characteristic pollutants in coal mines provided by an embodiment of the present invention. Figure 4 As shown, the detection device for natural release level of characteristic pollutants in coal mines of this embodiment includes a processor 11 and a memory 12, and the processor 11 is connected to the memory 12. The processor 11 is used to call and execute the program stored in the memory 12; the memory 12 is used to store the program, and the program is at least used to execute the detection method for natural release level of characteristic pollutants in coal mines in the above embodiment.

[0043] The specific implementation scheme of the detection equipment for natural release levels of characteristic pollutants in coal mines provided in the embodiments of the present application can refer to the implementation scheme of the detection method for natural release levels of characteristic pollutants in coal mines in any of the above embodiments, which will not be repeated here.

[0044] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0045] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0046] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0047] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0048] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0049] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0050] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for detecting the natural release level of characteristic pollutants in coal mines, characterized in that: include: Cutting, cleaning and airing the coal samples of target weight to obtain pre-processed samples; The first target volume of natural surface water from the detection site is mixed with the pretreated sample to obtain a mixed solution, and the mixed solution is placed in an open-air environmental test platform built in the field at the detection site to form a test group; the first target volume of natural surface water from the detection site is placed in an open-air environmental test platform built in the field at the detection site to form a blank group; At the same time, taking out a second target volume of liquid from the test group and the blank group, respectively, and performing concentration tests of characteristic pollutants on them respectively; Based on the concentration test results of the characteristic pollutants of the test group and the blank group at the same time, the natural release level of the characteristic pollutants of the coal mine sample is determined.

2. The method for detecting the natural release level of characteristic pollutants in coal mines according to claim 1, characterized in that: The target weight is 1 kg; The method of cutting, washing and airing the coal sample of target weight to obtain the pre-treated sample comprises: cutting and crushing 1 kg of the coal sample into 20-40 meshes, washing it with pure water for 3 times, and laying it flat to dry to obtain the pre-treated sample.

3. The method for detecting the natural release level of characteristic pollutants in coal mines according to claim 2, characterized in that: The characteristic pollutants include SO4 2- 、F - , As, Pb, Cd, Cr, Cu, Zn and B.

4. The method for detecting the natural release level of characteristic pollutants in coal mines according to claim 3, characterized in that: The step of determining the natural release level of characteristic pollutants in the coal mine sample based on the concentration test results of the characteristic pollutants in the test group and the blank group at the same time includes: Determining the total mass of the first characteristic pollutant based on the test concentration of the characteristic pollutant of the test group; and determining the total mass of the second characteristic pollutant based on the test concentration of the characteristic pollutant of the blank group; The difference between the total mass of the first characteristic pollutant and the total mass of the second characteristic pollutant is used as the natural release mass of the characteristic pollutant of the coal mine sample; The ratio of the natural release mass of the characteristic pollutants of the coal mine sample to the mass of the coal mine sample is taken as the natural release concentration of the characteristic pollutants of the coal mine sample.

5. The method for detecting the natural release level of characteristic pollutants in coal mines according to claim 4, characterized in that: The step of taking out a second target volume of liquid from the test group and the blank group at the same time comprises: At target time intervals, a second target volume of liquid is taken out from the test group and the blank group simultaneously for multiple times; And after taking out the second target volume of liquid each time, the second target volume of natural surface water at the detection site is added to the original liquid.

6. The method for detecting the natural release level of characteristic pollutants in coal mines according to claim 5, characterized in that: Also includes: Based on the natural release concentration of characteristic pollutants of the coal mine sample at each moment, the variation pattern of the natural release concentration of characteristic pollutants of the coal mine sample over time is determined.

7. A detection device for the natural release level of characteristic pollutants in coal mines, characterized in that: The invention comprises a processor and a memory, wherein the processor is connected to the memory: Wherein, the processor is used to call and execute the program stored in the memory; The memory is used to store the program, and the program is at least used to execute the method for detecting the natural release level of characteristic pollutants in coal mines as described in any one of claims 1-6.

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