Device and method for detecting acidification degree of dolomite

Abstract

The invention discloses a dolomite acidification degree detection device and method, and relates to the technical field of spectroscopy and mechanical detection and material analysis. The device comprises a first light path, a second light path and a photoelectric detector, a full infrared band light source, a diaphragm, a first spectroscope, a first reflector, a second reflector, a third reflector and a second spectroscope are sequentially arranged on the first light path; a first spectroscope, a phase delayer and a second spectroscope are sequentially arranged on the second light path; and the photoelectric detector is used for receiving the photoelectric signal of the to-be-detected sample output by the second spectroscope and calculating the intensity of the photoelectric signal of the to-be-detected sample, so that the acidification degree of the to-be-detected sample is evaluated according to the intensity of the photoelectric signal of the to-be-detected sample and a judgment standard. According to the scheme, the acidification degree and grade of the dolomite can be rapidly detected and automatically judged, the accuracy is high, and a scientific basis can be provided for actual engineering design, construction and maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of spectroscopy, mechanical detection and material analysis, and in particular to a device and method for detecting the acidification degree of dolomite. Background Art

[0002] The erosion of acidic groundwater seriously threatens construction projects and tunnel engineering, and may cause accidents such as water inrush and mud inrush, which has a huge impact on safe construction. The hydrogen ions (H+) in acidic groundwater can react with carbonate minerals in dolomite to acidify, causing the bearing structure in the dolomite to be dissolved, thereby increasing the porosity and permeability of the rock, causing the strength of the dolomite to be significantly reduced, and aggravating the destruction of the rock. As an important parameter for measuring rock strength, the degree of acidification plays a vital role in evaluating rock damage and preventing rock failure.

[0003] At present, the commonly used methods for detecting the degree of rock acidification include titration, thin section identification technology, scanning technology, X-ray diffraction technology, etc. These technical means can make detailed assessments of the mineral composition and structure of rocks, thereby determining the stability of rocks in acidic environments. However, the above methods are limited by the detection range and resolution time, making it difficult to timely and accurately identify the degree of rock acidification, reducing the reliability of evaluating rock damage and strength. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides the following technical solutions.

[0005] A first aspect of the present invention provides a dolomite acidification degree detection device, comprising a first optical path, a second optical path and a photoelectric detector;

[0006] The first optical path is provided with: a full infrared band light source, an aperture, a first beam splitter, a first reflector, a second reflector, a third reflector and a second beam splitter in sequence; wherein the outgoing light of the second reflector passes through the sample to be detected and is incident on the third reflector;

[0007] The second optical path is provided with: a first beam splitter, a phase delay device and a second beam splitter in sequence;

[0008] The photoelectric detector is used to receive the photoelectric signal of the sample to be detected output by the second spectroscope, and calculate the intensity of the photoelectric signal of the sample to be detected, so as to evaluate the acidification degree of the sample to be detected according to the intensity of the photoelectric signal of the sample to be detected and the evaluation criteria.

[0009] Preferably, the detection device also includes an intelligent rock acidification detection module, which uses the intensity of the photoelectric signal output by the photoelectric detector and the evaluated acidification degree of the sample to be detected as training data to train the neural network model, so that the trained neural network model can predict the acidification degree of dolomite based on the intensity of the photoelectric signal detected of the dolomite.

[0010] Preferably, the light emitted from the first beam splitter toward the first reflector is perpendicular to the light emitted from the first beam splitter toward the second beam splitter.

[0011] Preferably, the light emitted from the third reflector toward the second beam splitter is perpendicular to the light emitted from the phase retarder toward the second beam splitter.

[0012] Preferably, the intensity of the photoelectric signal calculated by the photodetector is 1410-1415 cm -1 and 870~876cm -1 The total intensity of the photoelectric signal in these two wavenumber ranges.

[0013] Preferably, the detection device also includes a shell, and the full-infrared band light source, aperture, first beam splitter, first reflector, second reflector, third reflector, second beam splitter, phase delay device and photoelectric detector are all arranged in the shell, and a light hole is opened in the shell, and the sample to be detected is arranged outside the shell and covers the light hole.

[0014] A second aspect of the present invention provides a method for detecting the acidification degree of dolomite using the dolomite acidification degree detection device as described in Example 1, the method comprising:

[0015] preparing a sample to be detected, wherein the sample to be detected includes a non-acidified standard and an acidified sample;

[0016] Placing the sample to be tested at the testing position so that during testing, the light emitted from the second reflector is reflected by the sample to be tested and then incident on the third reflector;

[0017] For each sample to be detected, a full infrared band light source is started to start detection, and the intensity of the photoelectric signal of the non-acidified standard or the acidified sample calculated by the photoelectric detector is obtained;

[0018] The intensity of the photoelectric signal of the non-acidified standard and the intensity of the photoelectric signal of the acidified sample are used to evaluate the degree of acidification of the acidified sample.

[0019] Preferably, the non-acidified standard is prepared by the following method:

[0020] Complete, uniform and completely non-acidified dolomite samples were selected and polished until the surface was smooth and complete without obvious pores and cracks.

[0021] Preferably, the acidified sample is prepared by the following method:

[0022] Complete, uniform and completely non-acidified dolomite samples were selected, cut, ground and polished into several pieces of the same size, washed with distilled water to remove surface impurities and then placed in a constant temperature dryer to dry to constant weight; the treated dolomite samples were divided into several groups, and each group was subjected to acidification treatment to different degrees.

[0023] Preferably, the step of evaluating the degree of acidification of the acidified sample comprises:

[0024] like Then the acidification level of the acidified sample is 3;

[0025] like Then the acidification level of the acidified sample is 2;

[0026] like Then the acidification level of the acidified sample is 1;

[0027] Among them, A 酸 A is the intensity of the photoelectric signal of the acidified sample; 未 is the intensity of the photoelectric signal of the standard without acidification;

[0028] The lower the acidification level value, the more acidified the sample is.

[0029] The beneficial effects of the present invention are as follows: the dolomite acidification degree detection device and method provided in the embodiment of the present invention, by constructing an optical path, using an optical method, outputting and calculating its intensity, combining the photoelectric signal intensity of the non-acidified standard and the photoelectric signal intensity of the acidified sample, and using a preset evaluation standard, the acidification degree and grade of the dolomite sample are determined. In addition, by setting up a rock acidification intelligent detection module, the acidification degree of the dolomite is predicted based on the intensity of the photoelectric signal of the detected dolomite using a trained neural network model. This solution can quickly detect and automatically determine the acidification degree and grade of dolomite with high accuracy, and can provide a scientific basis for actual engineering design, construction and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the dolomite acidification degree detection device of the present invention.

[0031] In the figure, the meanings of the symbols are as follows:

[0032] 1. Full infrared band light source, 2. Aperture, 3. First beam splitter, 4. Phase delay device, 5. First reflector, 6. Second reflector, 7. Light hole, 8. Third reflector, 9. Second beam splitter, 10. Sample to be tested. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Embodiment 1

[0035] like Figure 1 As shown, an embodiment of the present invention provides a dolomite acidification degree detection device, including a first optical path, a second optical path and a photoelectric detector.

[0036] The first optical path is provided with: a full infrared band light source 1, an aperture 2, a first beam splitter 3, a first reflector 5, a second reflector 6, a third reflector 8 and a second beam splitter 9 in sequence; wherein the outgoing light of the second reflector 6 passes through the sample to be detected 10 and then enters the third reflector 8.

[0037] The second optical path is provided with: a first beam splitter 3, a phase retarder 4 and a second beam splitter 9 in sequence.

[0038] The photoelectric detector is used to receive the photoelectric signal of the sample 10 to be detected output by the second spectroscope 9, and calculate the intensity of the photoelectric signal of the sample 10 to be detected, so as to evaluate the acidification degree of the sample 10 to be detected according to the intensity of the photoelectric signal of the sample 10 to be detected and the evaluation criteria.

[0039] Among them, the full infrared band light source adopts a long-life and high-intensity infrared band light source, including the wavelength range of near infrared, mid-infrared and far infrared, which can meet the detection needs of various acidic ions, and can better reflect the various physical processes and molecular structure characteristics inside the acidified rock. The aperture is used to accurately control the propagation direction and range of the light beam emitted by the light source to control the phase and interference effect of the light, thereby realizing the adjustment and optimization of the interference image. The first beam splitter is used to divide the incident light into two polarized lights with mutually perpendicular vibration directions according to a preset ratio, the transmitted light is P polarized light, and the reflected light is S polarized light. In the field of interferometry, the phase retarder is used to introduce or adjust the phase difference of the light wave to achieve high-precision measurement and analysis. The first reflector, the second reflector and the third reflector are used to change the propagation direction of the light to meet different optical needs. The second beam splitter is used to interfere and output the light beam carrying the sample information with the original light beam that does not carry the sample information.

[0040] The infrared beam emitted by the full infrared band light source is adjusted by the aperture to determine the propagation direction and range. The infrared beam is divided into two mutually perpendicular polarized beams according to a preset ratio by the first beam splitter. One beam propagates horizontally and is incident on the fixed first reflector, and then reflected to the surface of the second reflector for reflection. The reflected infrared beam is incident on the sample to be tested. After reflection from the sample surface, the infrared beam carrying the sample information is incident on the surface of the third reflector. At the same time, another infrared beam propagating vertically passes through the phase retarder, and forms a suitable phase difference with the horizontal beam through the adjustment of the beam phase. Then the horizontal and vertical beams interfere at the second beam splitter and output a photoelectric signal. The intensity is calculated by the photoelectric detector to reflect the acidification degree of the dolomite sample to be tested and to judge the acidification degree.

[0041] In this embodiment, the detection device may further include a power supply system, which supplies power to the full-infrared band light source so that the full-infrared band light source emits an infrared light beam.

[0042] In one embodiment of the present invention, the detection device may also include an intelligent rock acidification detection module, which uses the intensity of the photoelectric signal output by the photoelectric detector and the evaluated acidification degree of the sample to be detected as training data to train the neural network model, so that the trained neural network model can predict the acidification degree of dolomite based on the intensity of the photoelectric signal detected of the dolomite.

[0043] In one embodiment of the present invention, the detection device may further include a housing, wherein the full infrared band light source, aperture, first beam splitter, first reflector, second reflector, third reflector, second beam splitter, phase delay device and photoelectric detector are all arranged in the housing, and a light through hole is provided on the housing, and the sample to be detected is arranged outside the housing and covers the light through hole 7. During detection, the sample to be detected is placed at the light through hole, and the sample to be detected can cover the light through hole. The reflected light of the second reflector passes through the light through hole and is incident on the sample to be detected, and the infrared light beam carrying the sample information is reflected by the sample surface and is incident on the surface of the third reflector.

[0044] Dolomite is mainly composed of dolomite, and the calcium carbonate content of dolomite can account for more than 85% of the total weight of dolomite. When these minerals are soaked in hydrochloric acid, their surface and internal structure will change, thereby affecting the intensity of their photoelectric signals. Hydrochloric acid solutions of different concentrations contain a large amount of hydrogen ions (H + ) and chloride ions (Cl - ). During the rock acidification process, when hydrochloric acid (HCl) comes into contact with dolomite sample (CaMg(CO3)2), a chemical reaction occurs, and the equation is shown in formula (1):

[0045] CaMg(CO3)2+HCl→CaCl2+MgCl2+CO2+H2O (1)

[0046] The main reason for dolomite acidification is that the calcium carbonate-rich dolomite mineral particles are diluted and dissolved by hydrochloric acid. When the concentration of the hydrochloric acid solution is high, the carbonate ions (CO3 2 -) will react with hydrogen ions (H + ) and chloride ions (Cl - ) chemical reaction, hydrogen ions (H + ) and chloride ions (Cl - ) concentration, the more calcium chloride (CaCl2) and magnesium chloride (MgCl2) are precipitated, and the lower the carbonate ion content of the dolomite after acidification, indicating that the acidification degree of the dolomite is higher and the strength of the dolomite is lower. Therefore, in order to determine the acidification grade of dolomite, special attention should be paid to the infrared wave number of carbonate, specifically 1410-1415cm -1 and 870~876cm -1 The total intensity of the photoelectric signal within these two wavenumber ranges can be used to determine the degree of acidification of dolomite.

[0047] Embodiment 2

[0048] The embodiment of the present invention provides a method for detecting the acidification degree of dolomite using the dolomite acidification degree detection device as described in Example 1, the method comprising: preparing samples to be detected, the samples to be detected comprising non-acidified standard products and acidified samples; placing the samples to be detected at a detection position so that during detection, the emitted light of the second reflector is reflected by the sample to be detected and then incident on the third reflector; for each sample to be detected, starting a full-infrared band light source to start detection, and obtaining the intensity of the photoelectric signal of the non-acidified standard product or the acidified sample calculated by the photoelectric detector; and evaluating the acidification degree of the acidified sample using the intensity of the photoelectric signal of the non-acidified standard product and the intensity of the photoelectric signal of the acidified sample.

[0049] In the specific implementation process, it can be implemented according to the following steps:

[0050] 1) Calibration

[0051] In order to accurately determine the acidification degree of the rock, the device can be calibrated based on the sample characteristics before the first test. The detailed calibration process of dolomite is: ① Select a complete, uniform, and completely unacidified dolomite sample, i.e., a non-acidified standard, and polish it to make all sides of the standard smooth and complete, with no obvious pores or cracks on the surface. The size of the dolomite sample must at least completely cover the light-through hole (in the embodiment of the present invention, the size of the non-acidified standard or the acidified sample must at least completely cover the light-through hole), ② Place the prepared standard at the light-through hole, and turn on the power supply system for calibration. Detect the photoelectric signal strength on the six sides of the standard separately, test each side 3 times, and then take the average value Then the intensity of the photoelectric signal of the non-acidified standard is calculated using the following formula: 未 :

[0052]

[0053] It should be noted that if the standard product is a thin sheet (ie, the thickness of the standard product can be ignored), the photoelectric signal strength of both surfaces can be tested.

[0054] 2) Detection

[0055] The specific detection process of the rock acidification degree is as follows: ① Prepare dolomite samples with different acidification degrees, i.e., acidified samples. First, select a complete dolomite sample with similar initial physical and chemical properties to the dolomite in the calibration, cut, grind, and polish it into 10 uniform dolomite slices of the same size, thoroughly wash it with distilled water to remove surface impurities, place the washed samples in a constant temperature dryer and dry them to constant weight, and divide the treated dolomite samples into 5 groups, each of which is acidified with hydrochloric acid of different concentrations. ② Common acid solutions involved in rock acidification include hydrochloric acid (HCL) or sulfuric acid (H2SO4), etc., and hydrochloric acid acidification is used in the embodiment of the present invention. Five groups of dolomite samples are placed in hydrochloric acid solutions of different concentrations of 0.1mol / l, 0.01mol / l, 0.001mol / l, 0.0001mol / l, and 0.00001mol / l, respectively, and fully soaked for 72 hours at room temperature. ③ Place 5 groups of acidified samples flat on the light-through hole, turn on the power supply system for detection, and obtain the photoelectric signal intensity of the acidified samples.

[0056] 3) Perform photoelectric signal processing

[0057] When calibrating the non-acidified standard and detecting the acidified sample, the photoelectric detector receives the photoelectric signal output by the second spectroscope respectively, and calculates the intensity of the photoelectric signal of the sample to be detected. The specific calculation method is:

[0058] When an infrared beam is emitted, let its vibration amplitude be a, at instant t, ω is the circular frequency, ωt is the phase, and the magnitude of the light vector is E. According to the law of harmonic vibration, the vibration equation of the infrared light vector is shown in formula (2):

[0059] E=a sinωt (2)

[0060] When the infrared light beam propagates to the first beam splitter, it is evenly divided into two beams propagating along the horizontal and vertical axes respectively, and finally converges on the second beam splitter, satisfying the conditions of the same frequency, the same vibration direction, and a constant phase difference. Therefore, when the two beams meet in space, they will superimpose on each other, causing the light intensity in some areas to increase (called constructive interference) and the light intensity in some areas to decrease (called destructive interference), which is the interference phenomenon of light. At this time, the vibration equations in the two directions are shown in formulas (3) and (4):

[0061] E1=a sinωt sinθ (3)

[0062] E2=a sinωt cosθ (4)

[0063] Wherein, θ is the angle between the x direction of the principal stress axis and the polarization axis of the analyzer.

[0064] Since the two sub-vibrations pass through different media, their propagation speeds are also different. Therefore, it is assumed that there is a phase difference α between the two. The vibration equations are shown in formulas (5) and (6):

[0065] E3=a sinθsin(ωt+α) (5)

[0066] E4=a cosθsinωt (6)

[0067] When the two beams of light propagate to the second beam splitter, they are combined into a light wave, the vibration equation of which is shown in formula (7):

[0068]

[0069] Its light intensity is shown in formula (8):

[0070]

[0071] 1410~1415cm- 1 and 870~876cm- 1 The photoelectric signal intensities in these two wavenumber ranges are recorded as and and will and The sum of the photoelectric signal intensity of the final sample to be detected is recorded as A 酸, whose expression is shown in formula (9).

[0072] 4) Acidification degree assessment

[0073] By comparing A 酸 With A 未 , the degree of acidification is evaluated, the specific conditions are:

[0074] like The acidification level of the acidified sample is 3, and the acidification level of dolomite is low and relatively safe;

[0075] like The acidification level of the acidified sample is 2, and the dolomite acidification level is relatively high, so an appropriate warning can be given;

[0076] like The acidification level of the acidified sample is 1. The dolomite is highly acidified, which seriously reduces the rock strength and requires protection.

[0077] Among them, A 酸 A is the intensity of the photoelectric signal of the acidified sample; 未 It is the intensity of the photoelectric signal of the standard without acidification; the lower the acidification degree level value, the higher the acidification degree of the acidified sample.

[0078] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A dolomite acidification degree detection device, characterized in that: comprising a first optical path, a second optical path and a photoelectric detector; The first optical path is provided with: a full infrared band light source, an aperture, a first beam splitter, a first reflector, a second reflector, a third reflector and a second beam splitter in sequence; wherein the outgoing light of the second reflector passes through the sample to be detected and is incident on the third reflector; The second optical path is provided with: a first beam splitter, a phase delay device and a second beam splitter in sequence; The photoelectric detector is used to receive the photoelectric signal of the sample to be detected output by the second spectroscope, and calculate the intensity of the photoelectric signal of the sample to be detected, so as to evaluate the acidification degree of the sample to be detected according to the intensity of the photoelectric signal of the sample to be detected and the evaluation criteria.

2. The dolomite acidification degree detection device according to claim 1, characterized in that: The detection device also includes a rock acidification intelligent detection module, which uses the intensity of the photoelectric signal output by the photoelectric detector and the evaluated acidification degree of the sample to be detected as training data to train the neural network model, so that the trained neural network model can predict the acidification degree of dolomite based on the intensity of the photoelectric signal detected of the dolomite.

3. The dolomite acidification degree detection device according to claim 1, characterized in that: The light emitted from the first beam splitter toward the first reflecting mirror and the light emitted from the first beam splitter toward the second beam splitter are perpendicular to each other.

4. The dolomite acidification degree detection device according to claim 1, characterized in that: The light emitted from the third reflector toward the second beam splitter and the light emitted from the phase retarder toward the second beam splitter are perpendicular to each other.

5. The dolomite acidification degree detection device according to claim 1, characterized in that: The intensity of the photoelectric signal calculated by the photoelectric detector is the total intensity of the photoelectric signal in the two wave number ranges of 1410-1415 cm-1 and 870-876 cm-1 output by the second spectroscope.

6. The dolomite acidification degree detection device according to claim 1, characterized in that: The detection device also includes a shell, and the full-infrared band light source, aperture, first beam splitter, first reflector, second reflector, third reflector, second beam splitter, phase delay device and photoelectric detector are all arranged in the shell, and a light hole is opened in the shell, and the sample to be detected is arranged outside the shell and covers the light hole.

7. A method for detecting the degree of acidification of dolomite, characterized in that: The method is carried out using the dolomite acidification degree detection device according to any one of claims 1 to 6, and the method comprises: preparing a sample to be detected, wherein the sample to be detected includes a non-acidified standard and an acidified sample; Placing the sample to be tested at the testing position so that during testing, the light emitted from the second reflector is reflected by the sample to be tested and then incident on the third reflector; For each sample to be detected, a full infrared band light source is started to start detection, and the intensity of the photoelectric signal of the non-acidified standard or the acidified sample calculated by the photoelectric detector is obtained; The intensity of the photoelectric signal of the non-acidified standard and the intensity of the photoelectric signal of the acidified sample are used to evaluate the degree of acidification of the acidified sample.

8. The method for detecting the degree of dolomite acidification according to claim 7, characterized in that: The non-acidified standard was prepared by the following method: Complete, uniform and completely non-acidified dolomite samples were selected and polished until the surface was smooth and complete without obvious pores and cracks.

9. The method for detecting the degree of dolomite acidification according to claim 7, characterized in that: The acidified sample was prepared by the following method: Complete, uniform and completely non-acidified dolomite samples were selected, cut, ground and polished into several pieces of the same size, washed with distilled water to remove surface impurities and then placed in a constant temperature dryer to dry to constant weight; the treated dolomite samples were divided into several groups, and each group was subjected to acidification treatment to different degrees.

10. The method for detecting the degree of dolomite acidification according to claim 7, characterized in that: The step of evaluating the acidification degree of the acidified sample comprises: like Then the acidification level of the acidified sample is 3; like Then the acidification level of the acidified sample is 2; like Then the acidification level of the acidified sample is 1; Among them, A 酸 A is the intensity of the photoelectric signal of the acidified sample; 未 is the intensity of the photoelectric signal of the standard without acidification; The lower the acidification level value, the more acidified the sample is.

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