Method for rapidly evaluating high-purity quartz inclusion on site

Abstract

The invention provides a method for rapidly evaluating a high-purity quartz inclusion on site, and relates to the field of geological exploration. The method comprises the following steps: crushing, screening, washing and drying quartz ore to obtain a quartz ore sample to be evaluated; the method comprises the following steps: dispersing a to-be-evaluated quartz ore sample on a glass slide with a groove, wherein particles of the to-be-evaluated quartz ore sample are flat and are not overlapped; dropwise adding refraction oil to obtain a sample to be observed; placing a to-be-observed sample under a microscope, selecting target sample particles, and performing image acquisition on the target sample particles to obtain a target sample particle image; comparing the target sample particle image with the grading standard card to finish primary grading; and carrying out secondary grading according to the proportion of the transparent particles and the proportion of the non-transparent particles to obtain an evaluation result. According to the method, the limitation of a laboratory detection method on rapid evaluation of the ore sources in field geological exploration is overcome, the inclusion information can be rapidly obtained in the field, and powerful support is provided for geological exploration personnel to screen out the ore sources in time.

Description

Technical Field

[0001] The present application relates to the field of geological exploration, and in particular to a method for rapid on-site evaluation of high-purity quartz inclusions. Background Art

[0002] As a key mineral resource, high-purity quartz is of great significance in modern industry. It is an indispensable basic raw material for many high-tech industries such as semiconductors, photovoltaics, optical communications, aerospace, etc.

[0003] However, the quality assessment of high-purity quartz is a complex process, in which the evaluation of inclusions is particularly critical. Inclusions are fluid or solid substances captured during the growth of minerals. In high-purity quartz, the presence of inclusions can significantly affect its purity and performance. Impurity elements in inclusions may introduce defects during subsequent processing and reduce the quality of high-purity quartz products. For example, certain metal impurities may affect the electrical properties of semiconductors, while gas-liquid inclusions may produce bubbles in high-temperature environments, affecting the transparency and uniformity of optical components.

[0004] At present, the existing methods for evaluating high-purity quartz inclusions have many limitations. Although traditional laboratory testing methods can provide relatively accurate results, they often require complex sample preparation processes and professional instruments and equipment, which are cumbersome and time-consuming to operate, and cannot meet the needs of rapid evaluation of mineral sources in field geological exploration. For example, some methods based on spectral analysis require fine processing of samples, and the instruments are expensive and complicated to operate, which are not suitable for use in the field.

[0005] Therefore, in order to improve the efficiency of evaluating high-purity quartz sources in field geological environments, a simple, fast and effective inclusion evaluation method is urgently needed. Summary of the invention

[0006] The purpose of this application is to provide a method for rapid on-site evaluation of high-purity quartz inclusions to solve the above-mentioned problems.

[0007] To achieve the above objectives, this application adopts the following technical solutions: A method for rapid on-site evaluation of high-purity quartz inclusions, comprising: The quartz ore is crushed, screened, washed and dried to obtain a quartz ore sample to be evaluated; The quartz ore sample to be evaluated is dispersed on a glass slide with a groove, wherein the particles of the quartz ore sample to be evaluated are flat and have no overlap; then refractive oil is added dropwise to obtain a sample to be observed; Placing the sample to be observed under a microscope, selecting target sample particles, and collecting images of the target sample particles to obtain images of the target sample particles; The target sample particle image is compared with the grading standard card to complete the primary grading; then a secondary grading is performed according to the transparent particle ratio and the non-transparent particle ratio to obtain the evaluation result of the high-purity quartz inclusions; Among them, the transparent particles are particles whose inclusion area in a single quartz particle is not higher than 0.25%, and the impermeable particles are particles whose inclusion area in a single quartz particle is not lower than 4%.

[0008] Transparent quartz grains should have no black spots inside or no black spots under 50x magnification; opaque quartz grains refer to quartz containing a large number of black spots or impurity minerals; between the two are semi-transparent quartz grains, which contain a small amount of black spots inside.

[0009] Preferably, the particle size of the quartz ore sample to be evaluated is 60-140 mesh.

[0010] Preferably, the slide glass has a length of 30-75 mm, a width of 15-30 mm, and a thickness of 0.2-3 mm.

[0011] Preferably, the refractive oil includes one or more of paraffin oil, clove oil, cedar oil and kerosene.

[0012] Preferably, the magnification of the microscope is between 30-300.

[0013] Preferably, the number of the quartz ore samples to be evaluated is in the range of 20-40 per 6 square millimeters in the 50-fold magnification field of view of the microscope.

[0014] Preferably, the light source of the microscope is a normal light source or a polarized light source.

[0015] For example, ordinary LED white light source.

[0016] Preferably, the image acquisition method comprises: In the field of view, move the slide in the order of first shooting from left to right and then from top to bottom, 3-6 mm each time, to ensure that there are no repeated particles in the photos. Specifically, take 15-20 photos that can clearly observe the transparency of the quartz particles.

[0017] Preferably, the primary classification and the secondary classification both include grade I, grade II, grade III, and grade IV.

[0018] Preferably, the secondary classification standard is as follows: The proportion of permeable particles is greater than or equal to 65% and the proportion of impermeable particles is less than or equal to 2% for level I; The transparent particles account for 65% or more and the non-transparent particles account for 2% or more and 20% or less, which is Class II; or, the transparent particles account for 45% or more and 65% or less and the non-transparent particles account for 20% or less, which is Class II; The proportion of permeable particles is greater than or equal to 65% and the proportion of impermeable particles is greater than 20% and less than or equal to 35%, which is level III; or, the proportion of permeable particles is greater than or equal to 45% and less than 65% and the proportion of impermeable particles is greater than 20% and less than or equal to 55%, which is level III; or, the proportion of permeable particles is greater than or equal to 30% and less than 45% and the proportion of impermeable particles is less than or equal to 35%, which is level III; or, the proportion of permeable particles is greater than or equal to 0% and less than 30% and the proportion of impermeable particles is less than or equal to 8%, which is level III; The proportion of transparent particles is greater than or equal to 30% and less than 45%, and the proportion of impermeable particles is greater than 35% and less than or equal to 70%, which is level IV; or, the proportion of transparent particles is greater than or equal to 0% and less than 30%, and the proportion of impermeable particles is greater than 8% and less than or equal to 100%, which is level IV.

[0019] Through extensive observation of quartz ores and characteristic analysis of inclusions on the market, combined with the needs of practical applications, this application has developed a set of high-purity quartz grading standards based on the proportion of transparent particles, which are divided into four grades: I, II, III, and IV. For Class I quartz, reference is made to the ore source selected by Unimin, Inc. of the United States. As a world-renowned quartz sand supplier, Unimin, Inc. of the United States has always been famous for its high purity quartz products and has strict quality control and standards in this field. Type I quartz is of extremely high quality in terms of purity and performance, with very little mineral inclusions, and can fully meet the extremely high industrial demand for high-purity quartz; Type II quartz refers to the ore sources in India, and its inclusion characteristics are consistent with our judgment of Type II quartz. It has a high permeability and can meet most industrial needs for high-purity quartz; through the observation of some pegmatite-type ores in a certain area of ​​Xinjiang, the classification standard for Type III quartz was formulated, which is characterized by a high inclusion content and fewer transparent particles. Type III quartz can be used in some industrial fields that do not require high quartz purity; when observing vein quartz ore sources in a certain area of ​​Gansu, it was classified as Type IV quartz. This grade of quartz basically does not contain transparent particles and has poor quality, and can only be used in some low-quality quartz industrial needs.

[0020] Compared with the prior art, the beneficial effects of this application include: The method for on-site rapid evaluation of high-purity quartz inclusions provided in this application can quickly obtain information about the inclusions in the field, provide strong support for geological survey personnel to timely screen out quartz mineral sources with potential development value, and thus promote the rational development and utilization of high-purity quartz resources.

[0021] The method is easy to operate, fast and efficient, and can provide real-time reference data for field geological surveys, thereby improving the exploration efficiency of high-purity quartz resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0023] Figure 1 The grading standard card used in the embodiment of the present application; Figure 2 This is an image of the Grade II quartz ore of Baigang Rock in a certain area of ​​Xinjiang; Figure 3 This is a microscope image of the Grade II quartz ore of Baigang Rock in a certain area of ​​Xinjiang; Figure 4 This is an image of a grade III quartz ore in Baigang Rock in a certain area of ​​Xinjiang; Figure 5 This is a microscope image of grade III quartz ore from Baigang Rock in a certain area of ​​Xinjiang; Figure 6 This is an image of a vein quartz mine of level IV in a certain area of ​​Gansu; Figure 7 This is a microscope image of grade IV quartz ore, a vein quartz ore in a certain area of ​​Gansu. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0025] First, the grading standard cards used in the embodiment are shown as follows: Figure 1 shown.

[0026] Example 1 like Figure 2 As shown in the figure, we selected granite from a certain area in Xinjiang. This quartz ore belongs to the granite type mineral. Under the microscope, we can observe that it has some inclusions, which are usually distributed in bands ( Figure 3 ). In order to quickly evaluate the grade of the high-purity quartz, it needs to be crushed. The specific preparation method of the sample to be tested in step (1) is as follows: A. Crush the quartz sample to 2-3 mm, select the quartz single mineral particles and mix them evenly, crush them further and sieve them, wash away the dust and dirt on the surface of the quartz particles, and air-dry them to obtain quartz sample particles with a particle size between 60 and 140 meshes. Place the quartz particles on a glass slide according to the steps, and drop a mixture of paraffin oil and cedar oil for later testing; B. Place the prepared slide into a dedicated portable handheld microscope. For this embodiment, the microscope magnification is 50 times, and the sample is imaged. During the acquisition process, the shooting parameters are adjusted and the appropriate focal length is set to obtain a clear image. The obtained sample image is compared with the existing grading standard card, and the initial classification is Class II. According to statistics, transparent quartz particles account for 50% of all quartz particles (meeting the requirements of 45% and above of Class II quartz, the specific standards are as shown in Table 1 below), and non-transparent quartz particles account for 6% of all quartz particles (meeting the requirements of 8% and below of Class II quartz).

[0027] Comprehensively judging, the sample belongs to Type II quartz, indicating that its inclusion content is moderate, which has a certain impact on the mineral quality, but can still meet some industrial application needs to a certain extent.

[0028] The calculation of particle number ratio and inclusion area can be done manually or with image recognition software.

[0029] Table 1 Secondary classification standards

[0030] Example 2 like Figure 4 As shown in Figure 2, the quartz is a granite-type mineral. Under a microscope, it can be observed that there are a large number of inclusions inside the quartz particles ( Figure 5 ). The same on-site sampling operation as in Example 1: A. Crush the quartz sample to 2-3 mm, select the quartz single mineral particles and mix them evenly, sieve and wash the dust and dirt on the surface of the quartz particles, and air-dry them to obtain quartz sample particles with a particle size between 60 and 140 meshes. Place the quartz particles on a glass slide according to the steps, and add a mixture of kerosene and clove oil for later testing; B. Place the prepared slide into a dedicated portable handheld microscope. For this example, the microscope magnification is 50 times, and the sample is imaged. During the acquisition process, the shooting parameters are adjusted and the appropriate focal length is set to obtain a clear image. By comparing with the grading standard card, the initial classification is Class III; statistics show that transparent quartz particles account for 41% of all quartz particles (meeting the requirements of 30% or more for Class III quartz), and opaque quartz particles account for 12% of all quartz particles (meeting the requirements of 20% or less for Class III quartz).

[0031] It is judged that the sample is Type III quartz, which has a high inclusion content and a greater impact on the mineral quality. It may not be suitable for application scenarios with high requirements for high-purity quartz quality.

[0032] Example 3 like Figure 6 As shown, this quartz ore belongs to vein quartz type mineral, and no transparent particles can be observed under the microscope ( Figure 7 ). The same on-site sampling operation as in Example 1: A. Crush the quartz sample to 2-3 mm, select the quartz single mineral particles and mix them evenly, sieve them, wash the dust and dirt on the surface of the quartz particles with water, and air-dry them to obtain quartz sample particles with a particle size between 60 and 140 meshes. Place the quartz particles on a glass slide according to the steps, add clove oil and set aside for testing; B. Place the prepared slide into a dedicated portable handheld microscope. For this embodiment, the microscope magnification is selected to be 50 times, and the sample is imaged. During the acquisition process, the shooting parameters are adjusted and the appropriate focal length is set to obtain a clear image. The obtained sample image is compared with the existing standard data card. After comparison with the grading standard card, it is found that transparent quartz particles account for 0% of all quartz particles, and opaque quartz particles account for more than 97% of all quartz particles. Most of the individual quartz particles meet the standards for opaque quartz particles, and the inclusion area accounts for more than 4%. Comprehensively judged that the sample is type IV quartz, its inclusion content is very high, and the mineral quality is poor. It is not suitable as a high-purity quartz raw material for use in high-tech industries and other fields with high purity requirements.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for rapid on-site evaluation of high-purity quartz inclusions, characterized in that: include: The quartz ore is crushed, screened, washed and dried to obtain a quartz ore sample to be evaluated; The quartz ore sample to be evaluated is dispersed on a glass slide with a groove, wherein the particles of the quartz ore sample to be evaluated are flat and have no overlap; then refractive oil is added dropwise to obtain a sample to be observed; Placing the sample to be observed under a microscope, selecting target sample particles, and collecting images of the target sample particles to obtain images of the target sample particles; The target sample particle image is compared with the grading standard card to complete the primary grading; then a secondary grading is performed according to the transparent particle ratio and the non-transparent particle ratio to obtain the evaluation result of the high-purity quartz inclusions; Among them, the transparent particles are particles whose inclusion area in a single quartz particle is not higher than 0.25%, and the impermeable particles are particles whose inclusion area in a single quartz particle is not lower than 4%.

2. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 1, characterized in that: The particle size of the quartz ore sample to be evaluated is 60-140 mesh.

3. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 1, characterized in that: The slide glass has a length of 30-75 mm, a width of 15-30 mm, and a thickness of 0.2-3 mm.

4. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 1, characterized in that: The refractive oil includes one or more of paraffin oil, clove oil, cedar oil and kerosene.

5. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 1, characterized in that: The magnification of the microscope is between 30-300.

6. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 1, characterized in that: The number of the quartz ore samples to be evaluated ranges from 20 to 40 per 6 square millimeters in the 50-fold magnification field of view of the microscope.

7. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 1, characterized in that: The light source of the microscope is a normal light source or a polarized light source.

8. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 1, characterized in that: The image acquisition method comprises: In the field of view, move the slide in the order of first shooting from left to right and then from top to bottom, 3-6 mm each time, to ensure that there are no repeated particles in the photos. Specifically, take 15-20 photos that can clearly observe the transparency of the quartz particles.

9. The method for rapid on-site evaluation of high-purity quartz inclusions according to any one of claims 1 to 8, characterized in that: The primary classification and the secondary classification both include grade I, grade II, grade III, and grade IV.

10. The method for rapid on-site evaluation of high-purity quartz inclusions according to claim 9, characterized in that: The criteria for the secondary classification are as follows: The proportion of permeable particles is greater than or equal to 65% and the proportion of impermeable particles is less than or equal to 2% for level I; The transparent particles account for 65% or more and the non-transparent particles account for 2% or more and 20% or less, which is Class II; or, the transparent particles account for 45% or more and 65% or less and the non-transparent particles account for 20% or less, which is Class II; The proportion of permeable particles is greater than or equal to 65% and the proportion of impermeable particles is greater than 20% and less than or equal to 35%, which is level III; or, the proportion of permeable particles is greater than or equal to 45% and less than 65% and the proportion of impermeable particles is greater than 20% and less than or equal to 55%, which is level III; or, the proportion of permeable particles is greater than or equal to 30% and less than 45% and the proportion of impermeable particles is less than or equal to 35%, which is level III; or, the proportion of permeable particles is greater than or equal to 0% and less than 30% and the proportion of impermeable particles is less than or equal to 8%, which is level III; The proportion of transparent particles is greater than or equal to 30% and less than 45%, and the proportion of impermeable particles is greater than 35% and less than or equal to 70%, which is level IV; or, the proportion of transparent particles is greater than or equal to 0% and less than 30%, and the proportion of impermeable particles is greater than 8% and less than or equal to 100%, which is level IV.

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