Quartz sand sample electron probe efficient sample preparation and impurity mineral content detection method

Abstract

The invention relates to the technical field of electronic probes, in particular to a quartz sand sample electronic probe efficient sample preparation and impurity mineral content detection method, which comprises the following steps: mixing and grinding quartz sand and bonding liquid in an inert mortar according to a mass ratio of 4: 1-10: 1 to form a uniform mixture, transferring the uniform mixture to the surface of a glass slide, and compacting to form a sand layer of 1-5mm; the method comprises the following steps of: adding a quick permeation curing colloid dropwise for curing, sequentially carrying out coarse grinding, fine grinding and polishing treatment on a cured sample to finally obtain a detection surface with the surface roughness Ra being less than or equal to 0.2 mu m, putting a polished slice into an electronic probe, and carrying out qualitative analysis by a spectrometer and back scattering electron image scanning to obtain micro-area component data. Calculating the overall content of the impurity minerals by combining image analysis software; according to the method disclosed by the invention, through a step-by-step consolidation and multi-stage grinding process, the surface flatness of the sample meets the high-precision detection requirement of an electronic probe while the impurity distribution uniformity is guaranteed, so that the accuracy of quantitative analysis of the impurity content is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of electron probe technology, and in particular to a method for efficient preparation of quartz sand samples and detection of impurity mineral content using an electron probe. Background Technology

[0002] Electron probe microanalysis (EPMA) is a routine method used for the qualitative detection of impurity minerals and the quantitative analysis of micro-areas in raw ore samples. However, due to the common enrichment of impurity minerals in raw ores, there are two technical limitations in the detection process.

[0003] This patent addresses two technical shortcomings in existing electron probe microanalysis (EPMA) methods for detecting raw quartz ore: First, the non-uniform distribution of impurities leads to detection blind spots: the spatial non-uniform distribution of impurity minerals in the raw ore makes it difficult to effectively detect impurities in deep or non-surface areas, resulting in incomplete detection results. Second, local characterization limits quantitative accuracy: the aggregation characteristics of similar impurity minerals mean that EMA analysis can only reflect local micro-area characteristics, failing to achieve accurate quantitative characterization of the overall composition of the raw quartz ore. This patent proposes a sand preparation process to address the uniformity of spatial distribution of impurity minerals in raw quartz ore. However, the surface roughness of quartz sand samples significantly reduces the detection accuracy of the waveguide electron probe spectrometer (WDS), limiting the application effectiveness of this method. This patent proposes a novel sample preparation and detection method, aiming to simultaneously solve the problems of impurity distribution uniformity and surface smoothness by optimizing the sample preparation process for quartz sand samples, thereby achieving efficient and comprehensive qualitative detection of impurity minerals and high-precision overall quantitative analysis.

[0004] Therefore, in response to the above problems, this invention proposes an efficient sample preparation and impurity mineral content detection method for quartz sand samples using an electron probe. By optimizing the sample preparation process, it simultaneously solves the problems of insufficient detection accuracy caused by uneven impurity distribution and excessively high surface roughness. Summary of the Invention

[0005] To overcome the problems of insufficient detection accuracy caused by uneven impurity distribution and excessively high surface roughness in existing detection processes, this invention proposes an efficient sample preparation and impurity mineral content detection method for quartz sand samples using an electron probe.

[0006] The technical solution of this invention is: a method for efficient preparation of quartz sand samples using an electron probe microanalysis device and for detecting the content of impurity minerals, comprising the following steps: S1. Mix and grind quartz sand and binder in an inert mortar at a mass ratio of 4:1 to 10:1 to form a uniform mixture. Then transfer the mixture to the surface of a glass slide and compact it into a 1 to 5 mm sand layer. Add a fast-penetrating curing colloid for curing. S2, the cured sample is subjected to coarse grinding, fine grinding and polishing in sequence to finally obtain a test surface with a surface roughness Ra≤0.2μm; S3. The polished thin section is placed in an electron probe, and micro-area composition data is obtained by qualitative analysis with a spectrometer and backscattered electron image scanning. The overall content of impurity minerals is calculated by combining image analysis software.

[0007] Preferably, the preparation of the adhesive solution includes the following steps: mixing the viscous medium with the solvent, and stirring at a constant speed of 200~600r / min for 30~120 minutes using a magnetic stirrer to form a cold-dissolving adhesive solution with a concentration of 2%~10%.

[0008] The viscous medium is 5% polyvinyl alcohol powder, the solvent is cold water, the stirring time is 60 minutes, and the stirring speed is 400 r / min.

[0009] Preferably, the grinding pressure in step S1 is 0.3~0.8MPa, the grinding speed is 20~50r / min, and the mass ratio of the quartz sand to the binder is 8g:0.3ml.

[0010] Preferably, the curing environment temperature in step S1 is 15~30℃, the humidity is ≤50%, the rapid penetration curing colloid is ethyl α-cyanoacrylate, the sand layer thickness is 3mm, the curing time is 30 minutes, and the amount of adhesive added is ≤10%.

[0011] Preferably, in the coarse grinding stage of step S2, the solidified sample is ground to a target thickness of 1-3 mm using a diamond grinding disc with a mesh size of 200-2000. The grinding disc is 1000 mesh, the target thickness is 2mm, the head rotation speed is 60r / min, the disc rotation speed is 300r / min, and wet grinding in the same direction is performed for 360 seconds, followed by grinding in the opposite direction for the same amount of time.

[0012] Preferably, the fine grinding stage of step S2 is further ground using 1500-2500 grit sandpaper; The sandpaper is made of silicon carbide and has a grit of 2000. The rotary table rotates at 225 r / min and grinds for 360 seconds in both directions.

[0013] Preferably, the polishing stage of step S2 uses a cloth polishing pad and diamond polishing liquid; The polishing slurry has a particle size of 0.5~3μm, and the polishing fluid itself has a particle size of 1μm. The rotor speed is 60r / min, the turntable speed is 225r / min, and the polishing is performed for 180 seconds each in the same direction and in opposite directions. The final surface roughness Ra≤0.2μm and parallelism error≤0.05mm.

[0014] Preferably, in step S3, the polished sheet is placed on the electron probe sample stage, and an accelerating voltage of 10~20kV and a beam current parameter of 10~30nA are set. The accelerating voltage is 15kV, the beam current is 20nA, and the signal interference is reduced by more than 60% when the surface roughness Ra ≤ 0.2μm.

[0015] Preferably, the software used in step S3 is Photoshop or professional mineral analysis software, which, combined with electron probe quantitative data, controls the error within ±2%.

[0016] Preferably, the image analysis in step S3 uses color threshold segmentation technology to statistically determine the area ratio of impurities, and combines it with quantitative data from the spectrometer to control the overall content calculation error within ±2%.

[0017] The beneficial effects of this invention are: 1. By using a stepwise consolidation and multi-stage grinding process, the uniformity of impurity distribution is ensured while the surface smoothness of the sample meets the requirements of high-precision electron probe detection, thereby significantly improving the accuracy of quantitative analysis of impurity content.

[0018] 2. By using a low-cost bonding medium and a fast-curing colloid in synergy, the curing time is reduced to less than 1 / 10 of the conventional process while achieving directional particle consolidation. Furthermore, the raw materials are readily available and no complex equipment is required, which significantly reduces the sample preparation cost.

[0019] 3. The sample preparation process is simplified into three stages: consolidation, polishing, and testing. The operation is convenient and highly repeatable, and it does not require highly skilled personnel, thereby effectively improving testing efficiency.

[0020] 4. The entire process involves no high-temperature or highly corrosive reagents, reducing energy consumption and waste emissions. Balancing environmental protection and practicality, this solution provides an efficient, economical, and reliable integrated solution for the detection of impurities in quartz sand, and has significant application value for mineral quality control and efficient resource utilization. Attached Figure Description

[0021] Figure 1 The diagram shown illustrates the workflow of this invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides an embodiment: a method for efficient preparation of quartz sand samples and detection of impurity mineral content using an electron probe microanalysis method, comprising the following steps: S1. Mix and grind quartz sand and binder in an inert mortar at a mass ratio of 4:1 to 10:1 to form a uniform mixture. Then transfer the mixture to the surface of a glass slide and compact it into a 1 to 5 mm sand layer. Add a fast-penetrating curing colloid for curing. S2, the cured sample is subjected to coarse grinding, fine grinding and polishing in sequence to finally obtain a test surface with a surface roughness Ra≤0.2μm; S3. The polished thin section is placed in an electron probe, and micro-area composition data is obtained by qualitative analysis with a spectrometer and backscattered electron image scanning. The overall content of impurity minerals is calculated by combining image analysis software.

[0024] The preparation of the adhesive liquid includes the following steps: mixing the viscous medium with the solvent, and stirring at a constant speed of 200~600r / min for 30~120 minutes using a magnetic stirrer to form a cold-dissolving adhesive liquid with a concentration of 2%~10%.

[0025] The viscous medium is 5% polyvinyl alcohol powder, the solvent is cold water, the stirring time is 60 minutes, and the stirring speed is 400 r / min.

[0026] The grinding pressure in step S1 is 0.3~0.8MPa, the grinding speed is 20~50r / min, and the mass ratio of the quartz sand to the binder is 8g:0.3ml.

[0027] The curing environment temperature in step S1 is 15~30℃, the humidity is ≤50%, the rapid penetration curing colloid is ethyl α-cyanoacrylate, the sand layer thickness is 3mm, the curing time is 30 minutes, and the amount of adhesive added is ≤10%.

[0028] In the coarse grinding stage of step S2, the solidified sample is ground to a target thickness of 1-3 mm using a diamond grinding disc with a mesh size of 200-2000. The grinding disc is 1000 mesh, the target thickness is 2mm, the head rotation speed is 60r / min, the disc rotation speed is 300r / min, and wet grinding in the same direction is performed for 360 seconds, followed by grinding in the opposite direction for the same amount of time.

[0029] The fine grinding stage in step S2 uses 1500-2500 grit sandpaper for further grinding; The sandpaper is made of silicon carbide and has a grit of 2000. The rotary table rotates at 225 r / min and grinds for 360 seconds in both directions.

[0030] The polishing stage of step S2 uses a cloth polishing pad and diamond polishing liquid. The polishing slurry has a particle size of 0.5~3μm, and the polishing fluid itself has a particle size of 1μm. The rotor speed is 60r / min, the turntable speed is 225r / min, and the polishing is performed for 180 seconds each in the same direction and in opposite directions. The final surface roughness Ra≤0.2μm and parallelism error≤0.05mm.

[0031] In step S3, the polished sheet is placed on the electron probe sample stage, and the accelerating voltage of 10~20kV and the beam current parameter of 10~30nA are set. The accelerating voltage is 15kV, the beam current is 20nA, and the signal interference is reduced by more than 60% when the surface roughness Ra ≤ 0.2μm.

[0032] The software used in step S3 is Photoshop or professional mineral analysis software. Combined with electron probe quantitative data, the error is controlled within ±2%.

[0033] The image analysis in step S3 uses color threshold segmentation technology to statistically determine the area ratio of impurities, and combines it with quantitative data from the spectrometer to control the overall content calculation error within ±2%.

[0034] Please see Figure 1 Furthermore, the workflow of this invention will be described in detail below: First, the quartz sand sample is mixed and ground with a specific binding solution in an inert mortar. The uniform dispersion of impurity minerals is promoted by the encapsulation effect of the viscous medium. Then, the mixture is oriented and piled on the surface of a glass slide and compacted under appropriate pressure. Finally, a fast-penetrating and curing colloid is used to fill and solidify the gaps between the quartz sand particles, forming a cemented sample block with a stable internal structure, thus initially achieving uniform fixation of impurity minerals.

[0035] Secondly, the cured sample block undergoes multi-stage grinding and polishing. First, the surface macroscopic undulations are eliminated and the reference plane is calibrated using coarse grinding equipment. Then, the surface roughness is gradually reduced by combining fine polishing process to finally obtain a highly flat detection surface, thereby ensuring that the interference of surface morphology on the detection signal is minimized during electron probe scanning.

[0036] Finally, the polished thin section was placed in an electron probe, and the micro-area component distribution data were obtained through qualitative analysis by a spectrometer and backscattered electron imaging scanning mode. The mineral phases were then segmented by color thresholds and statistically analyzed by image analysis software. Combined with the quantitative analysis results, the overall content of impurity minerals was calculated, thus achieving optimization of the entire process from sample preparation to detection.

[0037] As can be seen from the above, the detection accuracy of the present invention is significantly improved: through stepwise consolidation and multi-stage grinding processes, the uniformity of impurity distribution (variance coefficient ≤ 5%) and surface roughness (Ra ≤ 0.2 μm) are optimized simultaneously, and the relative detection error is ≤ 3%; Sample preparation efficiency and economy: curing time is shortened to 30 minutes, raw material costs are reduced by 40%~60%, and single sample preparation time is ≤4 hours; Ease of operation: Modular equipment design simplifies operation, standardizes operation procedures, and reduces equipment dependence through step-by-step parameter control (such as speed grading and wet splash suppression); Environmental friendliness: No high-temperature or corrosive reagents are involved, reducing waste emissions by 70%, making it suitable for industrial testing needs.

[0038] Furthermore, the present invention provides an embodiment 1: Materials and Equipment: Eight g of quartz sand sample was used, with a particle size range of 60-160 mesh. The binder was a 5% concentration of polyvinyl alcohol (PVA) cold aqueous solution, prepared by mixing PVA powder with cold water and stirring at 400 rpm for 60 minutes using a magnetic stirrer. Ethyl α-cyanoacrylate was used as the curing agent. The main equipment included an agate mortar for mixing and grinding, a petrographic cutting and grinding machine equipped with a 1000-mesh diamond grinding disc for coarse grinding, and an automatic polishing machine equipped with 2000-mesh silicon carbide sandpaper for fine grinding and 1μm diamond polishing liquid with a cloth polishing disc for final polishing. An electron probe was used for subsequent detection and analysis, and Photoshop image processing software was used to count the area and calculate the content of impurity minerals.

[0039] Implementation steps: First, a consolidation treatment was performed. 8g of quartz sand sample with a particle size of 60~160 mesh was mixed with 0.3ml of pre-prepared polyvinyl alcohol (PVA) cold aqueous solution (this solution was prepared by stirring at 400r / min for 60 minutes using a magnetic stirrer) in an agate mortar. The mixture was ground for 8 minutes at a grinding pressure of 0.5MPa and a rotation speed of 30r / min to ensure that the binder fully coats the quartz sand particles and promotes the uniform dispersion of impurity minerals. The mixture was then transferred to the surface of a glass slide and mechanically compacted to form a uniform sand layer with a thickness of 3mm. Then, ethyl α-cyanoacrylate was uniformly applied at a drip rate of 0.1ml / cm² as a fast-penetrating curing colloid. The mixture was allowed to stand and cure for 30 minutes at an ambient temperature of 25℃ and a humidity of 40% to completely fill the gaps between the quartz sand particles and form a structurally stable cemented sample block.

[0040] Next, graded grinding and polishing were performed. First, a 1000-grit diamond grinding disc was used for rough grinding calibration on a petrographic cutting and grinding machine. The rotor speed was set to 60 r / min and the disc speed to 300 r / min. Wet grinding was performed in the same direction for 360 seconds, followed by grinding in the opposite direction for 360 seconds to precisely reduce the sample thickness to 2 mm and eliminate macroscopic surface undulations. Then, 2000-grit silicon carbide sandpaper was used for fine grinding. The disc speed was adjusted to 225 r / min. The symmetrical process of grinding in the same direction and in the opposite direction for 360 seconds each was used to gradually reduce the surface roughness. Finally, the polishing stage was entered. A cloth polishing disc was used with 1 μm diamond polishing fluid. The parameters of rotor speed 60 r / min and disc speed 225 r / min were maintained, and precision polishing was performed in the same direction and in the opposite direction for 180 seconds each.

[0041] After sample preparation, the detection and analysis stage begins. The polished thin section is placed on the electron probe sample stage, and surface scanning tests are performed using accelerating voltage of 15kV and beam current of 20nA. Backscattered electron images are used to obtain micro-area component distribution information, while quantitative data is acquired using a wave spectroscopy (WDS). Finally, Photoshop software is used to perform color threshold segmentation on the obtained backscattered images. Combined with the WDS quantitative analysis results, the area ratio and overall content of various impurity minerals are calculated, achieving high-precision detection with error control within ±2%. The entire process takes no more than 2 hours, which is 91.7% shorter than the traditional epoxy resin bonding method for sample preparation, reduces raw material costs by 90%, and generates no waste. The final sample exhibits good uniformity of impurity distribution, fully meeting the requirements for high-precision electron probe detection.

[0042] Implementation results: The surface roughness of the sample obtained after the above process reaches Ra=0.18μm, and the parallelism error is controlled within 0.04mm, which fully meets the requirements of high-precision electron probe detection. The impurity minerals show good uniformity of distribution in the quartz sand matrix, and backscattered electron image analysis shows no obvious aggregation phenomenon. The total time of the entire sample preparation process is no more than 2 hours, which is 91.7% shorter than the 24-hour curing time of the traditional epoxy resin bonding method. In terms of raw material cost, only PVA solution and ethyl α-cyanoacrylate are required, which is more than 90% lower than the traditional method. The entire preparation process has no high-temperature treatment, does not generate chemical waste, and achieves zero pollution emissions. Finally, the error of the impurity content data obtained by electron probe detection is controlled within ±2%, which proves that this method has significant advantages in terms of detection accuracy, sample preparation efficiency, economy and environmental protection.

[0043] Furthermore, the present invention provides an embodiment 2: Materials and Equipment: 10g of quartz sand sample with a particle size ≤60 mesh was used. The binder was an 8% concentration of polyvinyl alcohol (PVA) cold aqueous solution, prepared by mixing PVA powder with cold water and stirring at 300 rpm for 90 minutes using a magnetic stirrer. Ethyl α-cyanoacrylate was used as the curing agent. The main equipment included an agate mortar for mixing and grinding, a petrographic cutting and grinding machine equipped with an 800-mesh diamond grinding disc for coarse grinding, and an automatic polishing machine equipped with 1500-mesh silicon carbide sandpaper for fine grinding and 3μm diamond polishing liquid with a cloth polishing disc for final polishing. An electron probe was used for subsequent detection and analysis, and professional mineral analysis software (such as ImageJ) was used to count the area and calculate the content of impurity minerals.

[0044] Implementation steps: First, a consolidation treatment was performed. 10g of quartz sand sample with a particle size ≤60 mesh was mixed with 0.5ml of a pre-prepared 8% polyvinyl alcohol (PVA) cold aqueous solution (this solution was prepared by stirring at 300r / min for 90 minutes using a magnetic stirrer) in an agate mortar. The mixture was ground for 10 minutes at a grinding pressure of 0.4MPa and a rotation speed of 60r / min to ensure that the binder fully coats the quartz sand particles and promotes the uniform dispersion of impurity minerals. The mixture was then transferred to the surface of a glass slide and mechanically compacted to form a uniform sand layer with a thickness of 4mm. Then, ethyl α-cyanoacrylate was uniformly applied at a drip rate of 0.08ml / cm² as a fast-penetrating curing colloid. The mixture was allowed to stand and cure for 120 minutes at an ambient temperature of 20℃ and a humidity of 45% to completely fill the gaps between the quartz sand particles and form a structurally stable cemented sample block.

[0045] Next, graded grinding and polishing were performed. First, an 800-mesh diamond grinding disc was used on a petrographic cutting and grinding machine for rough grinding calibration. The rotor speed was set to 80 r / min and the disc speed to 250 r / min. Wet grinding was performed in the same direction for 400 seconds, followed by grinding in the opposite direction for 400 seconds to precisely reduce the sample thickness to 2.5 mm and eliminate macroscopic surface undulations. Then, 1500-mesh silicon carbide sandpaper was used for fine grinding. The disc speed was adjusted to 200 r / min. The symmetrical process of grinding in the same direction and in the opposite direction for 400 seconds each was used to gradually reduce the surface roughness. Finally, the polishing stage was entered. A cloth polishing disc was used with 3μm diamond polishing fluid. The parameters of rotor speed 80 r / min and disc speed 200 r / min were maintained, and precision polishing was performed in the same direction and in the opposite direction for 200 seconds each.

[0046] After sample preparation, the detection and analysis stage begins. The polished thin section is placed on the electron probe sample stage, and the working parameters of accelerating voltage 12kV and beam current 25nA are set for surface scanning test. Backscattered electron images are used to obtain micro-area composition distribution information, and quantitative data are collected by a wave spectroscopy (WDS). Finally, professional mineral analysis software (such as ImageJ) is used to process the obtained backscattered images, and the area ratio and overall content of various impurity minerals are calculated in combination with the WDS quantitative analysis results.

[0047] Implementation results: The surface roughness of the sample obtained after the above process is Ra=0.5μm, and the parallelism error is controlled within 0.10mm, meeting the basic requirements of electron probe microanalysis. The impurity minerals are well distributed in the quartz sand matrix, and backscattered electron image analysis shows no obvious local enrichment. The total time of the entire sample preparation process does not exceed 4 hours, which is 83.3% shorter than the 24-hour curing time of the traditional epoxy resin bonding method. In terms of raw material cost, it is more than 80% lower than the traditional method. There is no high-temperature treatment in the entire preparation process, and no harmful waste is generated, achieving environmentally friendly sample preparation. Finally, the error of the impurity content data obtained by electron probe microanalysis is controlled within a reasonable range, proving that this method has good sample preparation efficiency, economy and environmental protection while ensuring basic detection accuracy. It is suitable for detection scenarios that are cost-sensitive but have moderate accuracy requirements.

[0048] Example 1 uses the most optimized process parameters (such as 5% PVA concentration, 3mm sand layer, and 1000-mesh grinding disc), and its detection accuracy and efficiency are significantly better than those of Example 2.

[0049] Example 2 verified the applicability of the present invention within a wide parameter range by adjusting parameters (such as 8% PVA, 4mm sand layer, and 800-mesh grinding disc), and it is particularly suitable for scenarios that are cost-sensitive but have moderate precision requirements.

[0050] The above embodiments demonstrate that the present invention, through the synergistic control of stepwise consolidation and multi-stage grinding, can flexibly adapt to different testing requirements, ensuring the uniformity of impurity distribution and surface smoothness while achieving efficient and low-cost industrial applications.

[0051] The above description is only a typical embodiment of the present invention. All equivalent changes or modifications made within the scope of the principles of the present invention should be included within the protection scope of the present invention.

[0052] Through the above steps, using stepwise consolidation and multi-stage grinding processes, while ensuring the uniformity of impurity distribution, the surface smoothness of the sample meets the high-precision detection requirements of the electron probe, thereby significantly improving the accuracy of quantitative analysis of impurity content. This solves the problem of insufficient detection accuracy caused by the non-uniform distribution of impurities and excessive surface roughness in the existing detection process.

Claims

1. A high-efficiency electron probe microanalysis method for preparing quartz sand samples and detecting impurity mineral content, characterized in that, It includes the following steps: S1. Mix and grind quartz sand and binder in an inert mortar at a mass ratio of 4:1 to 10:1 to form a uniform mixture. Then transfer the mixture to the surface of a glass slide and compact it into a 1 to 5 mm sand layer. Add a fast-penetrating curing colloid for curing. S2, the cured sample is subjected to coarse grinding, fine grinding and polishing in sequence to finally obtain a test surface with a surface roughness Ra≤0.2μm; S3. The polished thin section is placed in an electron probe, and micro-area composition data is obtained by qualitative analysis with a spectrometer and backscattered electron image scanning. The overall content of impurity minerals is calculated by combining image analysis software.

2. The method for efficient electron probe microanalysis of quartz sand samples and detection of impurity mineral content according to claim 1, characterized in that, The preparation of the adhesive solution includes the following steps: mixing the viscous medium with the solvent, and stirring at a constant speed of 200~600r / min for 30~120 minutes using a magnetic stirrer to form a cold-dissolving adhesive solution with a concentration of 2%~10%; The viscous medium is 5% polyvinyl alcohol powder, the solvent is cold water, the stirring time is 60 minutes, and the stirring speed is 400 r / min.

3. The method for efficient electron probe microanalysis of quartz sand samples and detection of impurity mineral content according to claim 1, characterized in that: The grinding pressure in step S1 is 0.3~0.8MPa, the grinding speed is 20~50r / min, and the mass ratio of the quartz sand to the binder is 8g:0.3ml.

4. The method for efficient electron probe microanalysis of quartz sand samples and detection of impurity mineral content according to claim 1, characterized in that: The curing environment temperature in step S1 is 15~30℃, the humidity is ≤50%, the rapid penetration curing colloid is ethyl α-cyanoacrylate, the sand layer thickness is 3mm, the curing time is 30 minutes, and the amount of adhesive added is ≤10%.

5. The method for efficient electron probe microanalysis of quartz sand samples and detection of impurity mineral content according to claim 1, characterized in that: In the coarse grinding stage of step S2, the solidified sample is ground to a target thickness of 1-3 mm using a diamond grinding disc with a mesh size of 200-2000. The grinding disc is 1000 mesh, the target thickness is 2mm, the head rotation speed is 60r / min, the disc rotation speed is 300r / min, and wet grinding in the same direction is performed for 360 seconds, followed by grinding in the opposite direction for the same amount of time.

6. The method for efficient preparation of quartz sand samples and detection of impurity mineral content using an electron probe microanalysis according to claim 1, characterized in that: The fine grinding stage in step S2 uses 1500-2500 grit sandpaper for further grinding; The sandpaper is made of silicon carbide and has a grit of 2000. The rotary table rotates at 225 r / min and grinds for 360 seconds in both directions.

7. The method for efficient electron probe microanalysis of quartz sand samples and detection of impurity mineral content according to claim 1, characterized in that: The polishing stage of step S2 uses a cloth polishing pad and diamond polishing liquid. The polishing slurry has a particle size of 0.5~3μm, and the polishing fluid itself has a particle size of 1μm. The rotor speed is 60r / min, the turntable speed is 225r / min, and the polishing is performed for 180 seconds each in the same direction and in opposite directions. The final surface roughness Ra≤0.2μm and parallelism error≤0.05mm.

8. The method for efficient electron probe microanalysis of quartz sand samples and detection of impurity mineral content according to claim 1, characterized in that: In step S3, the polished sheet is placed on the electron probe sample stage, and the accelerating voltage of 10~20kV and the beam current parameter of 10~30nA are set. The accelerating voltage is 15kV, the beam current is 20nA, and the signal interference is reduced by more than 60% when the surface roughness Ra ≤ 0.2μm.

9. The method for efficient preparation of quartz sand samples and detection of impurity mineral content using an electron probe microanalysis method according to claim 1, characterized in that: The software used in step S3 is Photoshop or professional mineral analysis software. Combined with electron probe quantitative data, the error is controlled within ±2%.

10. The method for efficient electron probe microanalysis of quartz sand samples and detection of impurity mineral content according to claim 1, characterized in that: The image analysis in step S3 uses color threshold segmentation technology to statistically determine the area ratio of impurities, and combines it with quantitative data from the spectrometer to control the overall content calculation error within ±2%.

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