Method for positioning same particle before and after gold leaching

Abstract

The invention provides a method for positioning the same particle before and after gold leaching, and belongs to the technical field of particle positioning analysis. According to the method, the heavy sand sample is obtained through manual reselection; removing sulfide to obtain a gold mineral monomer; uniformly mixing the resin 1, the curing agent 1, gangue mineral particles and different pigments, and respectively adding the mixture into grinding tools with different shapes; after the resin is cured, gold minerals are selected to be placed in molds of different shapes; and uniformly mixing the resin 2 and the curing agent 2, adding the mixture into a mold, grinding and polishing to obtain exposed gold mineral monomer particles, and observing the surface phenomena before and after gold leaching under a stereomicroscope and a scanning electron microscope through different colors and shapes respectively for experimental research on the gold leaching effect of the gold leaching agent. According to the method, gangue mineral particles with different colors are introduced into the resin, so that the same gold mineral can be found more quickly after each test, the phenomena presented before and after leaching of the gold mineral are detected, and the method has guiding significance on experimental research of the gold leaching agent.

Description

Technical Field

[0001] The invention relates to the technical field of particle positioning analysis, and in particular to a method for positioning the same particle before and after gold immersion. Background Art

[0002] In gold mining, gold leaching is an important technology for extracting gold. It mainly dissolves and recovers gold through chemical solutions. Chemical gold leaching is to dissolve and recover gold from ore through chemical reactions, mainly including cyanide method, thiourea method, thiosulfate method, etc. At present, the gold leaching effect of these gold leaching methods is mainly determined by calculating the gold leaching rate by calculating the gold in the leaching solution. However, this method cannot specifically analyze whether it is the reagent or other factors in the ore that affect the gold leaching effect.

[0003] Process mineralogy research is constantly developing and improving with the development of process mineralogy and the progress of related analysis and detection technologies. In modern process mineralogy research, automatic mineralogical analysis equipment such as MLA mineral parameter automatic quantitative analysis system are widely used. These devices are based on the backscattered image data of samples collected by electron microscopes, combined with the component recognition function of energy spectra, to automatically identify, identify and test minerals. Process mineralogy research has the function of quickly and accurately obtaining sample-related data through image analysis of test samples. However, in process mineralogy analysis, it is difficult to quickly find the same particle sample when conducting a secondary test.

[0004] In view of this, it is necessary to design a method to locate the same particle before and after gold immersion to solve the above problems. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the present application provides a method for locating the same particle before and after gold leaching, aiming to solve the problems that the existing gold leaching effect evaluation cannot exclude the influence of other factors on the leaching effect of gold leaching agents and the difficulty in quickly finding the same particle sample during the secondary test in process mineralogy analysis.

[0006] The present application provides a method for locating the same particle before and after gold immersion, comprising the following steps: S1. Reselect the raw ore sample to obtain a heavy sand sample; S2. leaching the heavy sand sample to obtain a gold mineral monomer; S3. The resin 1, curing agent 1, gangue mineral particles and pigments of different colors are mixed to obtain resins of different colors, and the resin 1 and curing agent 1 are mixed to obtain a conventional resin; S4. The resins of different colors are added to the grooves of different patterns circled in the mold, and conventional resin is added to the area outside the grooves of the mold and cured; S5. placing the gold mineral monomer in different patterns of the mold; S6. Mixing resin 2 and curing agent 2 and adding them to all areas of the mold, shaking, curing, cooling, grinding and polishing, the target sample is obtained; S7. Place the target sample under a stereo microscope, take photos of samples in different color areas, and obtain Photo 1; take photos of samples in different shapes under a scanning electron microscope, and obtain Photo 2; S8. The target sample is leached with gold to obtain a sample after leaching with gold; S9. The gold-immersed sample is placed under a stereo microscope, and photographs are taken of samples in different color regions to obtain Photo 3; photographs are taken of samples in different shapes under a scanning electron microscope to obtain Photo 4; S10. Compare the phenomena on the surface of gold particles in Photos 1 and 3, and Photos 2 and 4.

[0007] In the technical scheme of the embodiment of the present application, a heavy sand sample is obtained by reselection; then the sulfide is removed to obtain a gold mineral monomer; resin 1, curing agent 1, gangue mineral particles and different pigments are mixed and added to molds of different shapes respectively; after the resin is cured, gold minerals are selected in molds of different shapes; then resin 2 and curing agent 2 are mixed and added to the mold, and polished to obtain exposed gold mineral monomer particles, and the surface phenomena before and after gold leaching are observed under a stereo microscope and a scanning electron microscope by different colors and shapes, respectively, for experimental research on the gold leaching effect of the gold leaching agent. This application introduces different colors into the resin, and when observed with a stereo microscope, the same gold mineral can be found more quickly after each test through different color areas; by introducing gangue mineral particles into the resin, because the gray value of the gangue mineral is different from the gray value of the resin, the different shapes of the gangue mineral circle can be used to find the same gold mineral more accurately and quickly under a scanning electron microscope, and the phenomena presented before and after the gold mineral is leached are detected, which has guiding significance for the experimental research of the gold leaching agent.

[0008] In some embodiments, in step S3, the gangue mineral particles include one or more of quartz, feldspar and calcium carbonate.

[0009] In this embodiment, by adding one or more of quartz, feldspar and calcium carbonate to the resin, it is possible to ensure that the grayscale of the resin area after adding the above gangue mineral particles is different from that of the resin area without adding the gangue mineral particles, so that the same gold mineral can be found quickly and accurately through the different shapes of graphics circled by the gangue minerals under a scanning electron microscope.

[0010] In some embodiments, in step S4, the graphics include triangles, squares, rectangles, circles and semicircles; the triangle is an equilateral triangle, and the side length of the equilateral triangle is 2~5mm; the side length of the square is 2~5mm; the length of the rectangle is 5~7mm and the width is 2~4mm; the diameter of the circle is 6~8mm, and the width of the groove is 1mm.

[0011] In this embodiment, by circling different patterns in the mold and adding gangue mineral particles, the same gold particle before and after gold immersion can be quickly located under a scanning electron microscope.

[0012] In some embodiments, in step S5, the number of gold mineral particles in different patterns of the mold is 1 to 3, and the size of the gold mineral particles does not exceed the range of the pattern.

[0013] In this embodiment, the gold mineral particles need to be within the range of the pattern in order to find the same gold particles when observing the samples before and after gold immersion through a stereo microscope and a scanning electron microscope. The same gold particles before and after gold immersion cannot be quickly found outside the pattern.

[0014] In some embodiments, in step S2, the liquid-to-solid ratio of the leaching is (5:1)~(15:1) mL / g, the leaching temperature is 40~60°C, the leaching time is 2~4h, and the leaching stirring speed is 200~300r / min.

[0015] In this embodiment, under the leaching conditions, the sulfide can be completely dissolved to obtain gold mineral monomers.

[0016] In some embodiments, in step S1, the mass of the raw ore sample is ≥5kg, and the gravity separation is manual gravity separation, and the steps of manual gravity separation include: dividing the raw ore into several samples on average, manually re-panning, and then mixing them together to obtain a heavy sand mixed sample.

[0017] In this embodiment, gold is recovered and associated heavy minerals are removed by gravity separation.

[0018] In some embodiments, in step S2, the leaching agents are trifluoroacetic acid and hydrogen peroxide; the concentration of the trifluoroacetic acid is 0.1-1.0 mol / L, and the concentration of the hydrogen peroxide is 3-15%.

[0019] In this example, sulfides in the ore are dissolved by trifluoroacetic acid and hydrogen peroxide.

[0020] In some embodiments, in step S3, the ratio of the resin 1 to the curing agent 1 is 2:1; in step S4, the curing temperature is 40-50°C.

[0021] In this embodiment, sample substrates with different colors and shapes are formed in the mold through curing.

[0022] In some embodiments, in step S6, the ratio of the resin 2 to the curing agent 2 is 2:1, and the curing temperature is 18-22°C.

[0023] In this example, a sample containing gold particles is obtained by adding a resin and a curing agent.

[0024] In some embodiments, in step S6, the grinding and polishing process is: first, use sandpaper with sizes of 240 mesh, 800 mesh and 1200 mesh to grind for 8 to 12 minutes respectively; then use polishing cloth with particle sizes of 6um, 3um and 1um to polish for 8 to 12 minutes respectively.

[0025] In this embodiment, one side of the gold particles is exposed by grinding and polishing, which facilitates the subsequent gold immersion treatment.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The corresponding scanning electron microscope images and stereo microscope images of different gold particles in Example 1 before and after gold immersion.

[0029] Figure 2 These are the corresponding scanning electron microscope images and stereo microscope images of different gold particles in Example 2 before and after gold immersion. DETAILED DESCRIPTION

[0030] The following is a detailed description of the embodiments of the technical solution of the present application. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] In order to solve the problems that the existing gold leaching effect evaluation cannot exclude the influence of other factors on the leaching effect of gold leaching agents, and the process mineralogy analysis is difficult to quickly find the same particle sample in the secondary test, this application provides a method for locating the same particle before and after gold leaching. Through artificial re-selection, a heavy sand sample is obtained; then the sulfide is removed to obtain a gold mineral monomer; resin 1, curing agent 1, gangue mineral particles and different pigments are mixed and added to molds of different shapes respectively; after the resin is cured, gold minerals are selected in molds of different shapes; then resin 2 and curing agent 2 are mixed and added to the mold, and polished to obtain exposed gold mineral monomer particles, and the surface phenomena before and after gold leaching are observed under a stereo microscope and a scanning electron microscope through different colors and shapes, which are used for experimental research on the gold leaching effect of gold leaching agents. The present application introduces different colors into the resin, and when observing with a stereo microscope, the same gold mineral can be found more quickly after each test through different color areas; by introducing gangue mineral particles into the resin, since the gray value of the gangue mineral is different from the gray value of the resin, the same gold mineral can be found more accurately and quickly under a scanning electron microscope through different shapes of graphics circled by the gangue mineral, and the phenomenon presented before and after the leaching of the gold mineral can be detected, which has guiding significance for the experimental research of the gold leaching agent.

[0034] The present application provides a method for locating the same particle before and after gold immersion, comprising the following steps: S1. Reselect the raw ore sample to obtain a heavy sand sample; S2. leaching the heavy sand sample to obtain a gold mineral monomer; S3. The resin 1, curing agent 1, gangue mineral particles and pigments of different colors are mixed to obtain resins of different colors, and the resin 1 and curing agent 1 are mixed to obtain a conventional resin; S4. The resins of different colors are added to the grooves of different patterns circled in the mold, and conventional resin is added to the area outside the grooves of the mold and cured; S5. placing the gold mineral monomer in different patterns of the mold; S6. Mixing resin 2 and curing agent 2 and adding them to all areas of the mold, shaking, curing, cooling, grinding and polishing, the target sample is obtained; S7. Place the target sample under a stereo microscope, take photos of samples in different color areas, and obtain Photo 1; take photos of samples in different shapes under a scanning electron microscope, and obtain Photo 2; S8. The target sample is leached with gold to obtain a sample after leaching with gold; S9. The gold-immersed sample is placed under a stereo microscope, and photographs are taken of samples in different color regions to obtain Photo 3; photographs are taken of samples in different shapes under a scanning electron microscope to obtain Photo 4; S10. Compare the phenomena on the surface of gold particles in Photos 1 and 3, and Photos 2 and 4.

[0035] In the technical scheme of the embodiment of the present application, a heavy sand sample is obtained by reselection; then the sulfide is removed to obtain a gold mineral monomer; resin 1, curing agent 1, gangue mineral particles and different pigments are mixed and added to molds of different shapes respectively; after the resin is cured, gold minerals are selected in molds of different shapes; then resin 2 and curing agent 2 are mixed and added to the mold, and polished to obtain exposed gold mineral monomer particles, and the surface phenomena before and after gold leaching are observed under a stereo microscope and a scanning electron microscope by different colors and shapes, respectively, for experimental research on the gold leaching effect of the gold leaching agent. This application introduces different colors into the resin, and when observed with a stereo microscope, the same gold mineral can be found more quickly after each test through different color areas; by introducing gangue mineral particles into the resin, because the gray value of the gangue mineral is different from the gray value of the resin, the different shapes of the gangue mineral circle can be used to find the same gold mineral more accurately and quickly under a scanning electron microscope, and the phenomena presented before and after the gold mineral is leached are detected, which has guiding significance for the experimental research of the gold leaching agent.

[0036] Furthermore, in some embodiments, in step S3, the gangue mineral particles include one or more of quartz, feldspar and calcium carbonate.

[0037] In the technical solution of the embodiment of the present application, by adding one or more of quartz, feldspar and calcium carbonate to the resin, it is possible to ensure that the grayscale of the resin area after adding the above gangue mineral particles is different from that of the resin area without adding the gangue mineral particles, so that the same gold mineral can be found quickly and accurately through the different shapes of graphics circled by the gangue minerals under a scanning electron microscope.

[0038] Further, in some embodiments, in step S4, the graphics include triangles, squares, rectangles, circles and semicircles; the triangle is an equilateral triangle, and the side length of the equilateral triangle is 2~5mm; the side length of the square is 2~5mm; the length of the rectangle is 5~7mm, and the width is 2~4mm; the diameter of the circle is 6~8mm, and the width of the groove is 1mm.

[0039] In the technical solution of the embodiment of the present application, by circling different patterns in the mold and adding gangue mineral particles, the same gold particle before and after gold immersion can be quickly located under a scanning electron microscope.

[0040] Furthermore, in some embodiments, in step S5, the number of gold mineral particles in different patterns of the mold is 1 to 3, and the size of the gold mineral particles does not exceed the range of the pattern.

[0041] In the technical solution of the embodiment of the present application, the gold mineral particles need to be within the range of the pattern to find the same gold particles when observing the samples before and after gold immersion through a stereo microscope and a scanning electron microscope. The same gold particles before and after gold immersion cannot be quickly found outside the pattern.

[0042] Furthermore, in some embodiments, in step S2, the liquid-to-solid ratio of the leaching is (5:1) to (15:1) mL / g, the leaching temperature is 40 to 60°C, the leaching time is 2 to 4 hours, and the leaching stirring speed is 200 to 300 r / min.

[0043] In the technical solution of the embodiment of the present application, under the leaching conditions, the sulfide can be completely dissolved to obtain gold mineral monomers.

[0044] Furthermore, in some embodiments, in step S1, the mass of the raw ore sample is ≥5kg, the gravity separation is manual gravity separation, and the step of manual gravity separation includes: dividing the raw ore into several samples on average, manually re-panning, and then mixing them together to obtain a heavy sand mixed sample.

[0045] In the technical solution of the embodiment of the present application, gold is recovered and associated heavy minerals are removed by gravity separation.

[0046] Furthermore, in some embodiments, in step S2, the leaching agents are trifluoroacetic acid and hydrogen peroxide; the concentration of the trifluoroacetic acid is 0.1-1.0 mol / L, and the concentration of the hydrogen peroxide is 3-15%.

[0047] In the technical solution of the embodiment of the present application, the sulfide in the ore can be dissolved by trifluoroacetic acid and hydrogen peroxide.

[0048] Furthermore, in some embodiments, in step S3, the ratio of the resin 1 to the curing agent 1 is 2:1; in step S4, the curing temperature is 40-50°C.

[0049] In the technical solution of the embodiment of the present application, sample substrates with different colors and shapes are formed in the mold through curing.

[0050] Furthermore, in some embodiments, in step S6, the ratio of the resin 2 to the curing agent 2 is 2:1, and the curing temperature is 18-22°C.

[0051] In the technical solution of the embodiment of the present application, a sample containing gold particles is obtained by adding resin and curing agent.

[0052] Further, in some embodiments, in step S6, the grinding and polishing process is: first, use sandpaper with sizes of 240 mesh, 800 mesh and 1200 mesh to grind for 8 to 12 minutes respectively; then use polishing cloth with particle sizes of 6um, 3um and 1um to polish for 8 to 12 minutes respectively.

[0053] In the technical solution of the embodiment of the present application, one side of the gold particles is exposed by grinding and polishing, which facilitates the subsequent gold immersion treatment.

[0054] Some specific embodiments are listed below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0055] Example 1 This embodiment provides a method for locating the same particle before and after gold immersion, which specifically includes the following steps: (1) Weigh 5 kg of ore sample, mix it evenly, divide it into five samples, re-pan them manually, and then mix them together to obtain a heavy sand mixed sample.

[0056] (2) The obtained heavy sand mixed sample was mixed with trifluoroacetic acid with a concentration of 0.1 mol / L and hydrogen peroxide with a concentration of 3%. The liquid-solid ratio was controlled at (5:1) mL / g. The mixture was leached at a stirring speed of 200 r / min and 40°C for 2 hours to obtain a gold mineral monomer.

[0057] (3) Use a groove with a width of 1 mm to circle an equilateral triangle with a side length of 2 mm, a square with a side length of 2 mm, a rectangle with a length of 5 mm and a width of 2 mm, and a circle with a diameter of 6 mm in a mold. Mix the resin and curing agent with a mass ratio of 2:1, add calcium carbonate, and then mix them with pigments of different colors. Then add them to the grooves of different shapes. Add the resin and curing agent mixture with a mass ratio of 2:1 without calcium carbonate and pigment to the area outside the grooves in the mold, and place the mold in a 40℃ oven for curing. Among them, the four shapes of triangle, square, rectangle and circle correspond to red, green, blue and pink respectively. Use a needle to select a gold ore whose size does not exceed the range of the shape and place it in the molds of triangle, square, rectangle and circle shapes.

[0058] (4) Then, the resin and curing agent were mixed in a ratio of 2:1 and added to the mold. The mixture was ultrasonically vibrated for 20 minutes and cured in a 40°C oven. After cooling to room temperature, the mixture was ground with sandpaper of 240 mesh, 800 mesh, and 1200 mesh for 10 minutes respectively, and then polished with polishing cloth of 6um, 3um, and 1um for 10 minutes respectively. The gold mineral monomer particle samples with surface exposure were obtained, and the surface phenomena were observed under a scanning electron microscope and a stereo microscope, and photographed and recorded respectively.

[0059] (5) The gold mineral monomer particle samples with exposed surface are leached with sodium thiosulfate for a period of time, and then the samples are placed under a scanning electron microscope and a stereo microscope. The same gold particles before leaching are found based on their shape and color, and photographed and recorded respectively.

[0060] (6) Comparing the results of the two photos, it was found that the edges and surfaces of the gold particles did not change much, which indicates that the experimental effect of the gold immersion agent was poor.

[0061] The corresponding scanning electron microscope images and stereo microscope images of different gold particles before and after gold immersion in this embodiment are as follows: Figure 1 shown.

[0062] Depend on Figure 1 From the shape of gold, it can be seen that the gold leaching effect of this gold leaching agent is poor.

[0063] Example 2 Example 2 provides a method for locating the same particle before and after gold leaching. Compared with Example 1, the difference is that the gold leaching agent in step (6) is different. The gold leaching agent is iodine and potassium iodide. The other steps are roughly the same as Example 1 and will not be repeated here.

[0064] The corresponding scanning electron microscope images and stereo microscope images of different gold particles before and after gold immersion in this embodiment are as follows: Figure 2 shown.

[0065] Depend on Figure 2From the shape of gold, it can be seen that the gold leaching agent has a good gold leaching effect.

[0066] In summary, the present application provides a method for locating the same particle before and after gold leaching. A heavy sand sample is obtained by reselection; then the sulfide is removed to obtain a gold mineral monomer; resin 1, curing agent 1, gangue mineral particles and different pigments are mixed and added to molds of different shapes respectively; after the resin is solidified, gold minerals are selected in molds of different shapes; then resin 2 and curing agent 2 are mixed and added to the mold, and polished to obtain exposed gold mineral monomer particles, and the surface phenomena before and after gold leaching are observed under a stereo microscope and a scanning electron microscope by different colors and shapes, respectively, for experimental research on the gold leaching effect of gold leaching agents. The present application introduces different colors into the resin, and when observed with a stereo microscope, the same gold mineral can be found more quickly after each test through different color areas; by introducing gangue mineral particles into the resin, because the gray value of the gangue mineral is different from the gray value of the resin, the different shapes of the gangue mineral circled can be used to find the same gold mineral more accurately and quickly under a scanning electron microscope, and the phenomena presented before and after the gold mineral leaching are detected, which has guiding significance for the experimental research of gold leaching agents.

[0067] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for locating the same particle before and after gold immersion, characterized in that: The following steps are involved: S1. Reselect the raw ore sample to obtain a heavy sand sample; S2. leaching the heavy sand sample to obtain a gold mineral monomer; S3. The resin 1, curing agent 1, gangue mineral particles and pigments of different colors are mixed to obtain resins of different colors, and the resin 1 and curing agent 1 are mixed to obtain a conventional resin; S4. The resins of different colors are added to the grooves of different patterns circled in the mold, and conventional resin is added to the area outside the grooves of the mold and cured; S5. placing the gold mineral monomer in different patterns of the mold; S6. Mixing resin 2 and curing agent 2 and adding them to all areas of the mold, shaking, curing, cooling, grinding and polishing, the target sample is obtained; S7. Place the target sample under a stereo microscope, take photos of samples in different color areas, and obtain Photo 1; take photos of samples in different shapes under a scanning electron microscope, and obtain Photo 2; S8. The target sample is leached with gold to obtain a sample after leaching with gold; S9. The gold-immersed sample is placed under a stereo microscope, and photographs are taken of samples in different color regions to obtain Photo 3; photographs are taken of samples in different shapes under a scanning electron microscope to obtain Photo 4; S10. Compare the phenomena on the surface of gold particles in Photos 1 and 3, and Photos 2 and 4.

2. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S3, the gangue mineral particles include one or more of quartz, feldspar and calcium carbonate.

3. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S4, the graphics include triangles, squares, rectangles, circles and semicircles; the triangle is an equilateral triangle, and the side length of the equilateral triangle is 2~5mm; the side length of the square is 2~5mm; the length of the rectangle is 5~7mm and the width is 2~4mm; the diameter of the circle is 6~8mm, and the width of the groove is 1mm.

4. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S5, the number of gold mineral particles in different patterns of the mold is 1 to 3, and the size of the gold mineral particles does not exceed the range of the pattern.

5. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S2, the liquid-to-solid ratio of the leaching is (5:1) to (15:1) mL / g, the leaching temperature is 40 to 60°C, the leaching time is 2 to 4 hours, and the leaching stirring speed is 200 to 300 r / min.

6. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S1, the mass of the raw ore sample is ≥5kg, and the gravity separation is manual gravity separation. The steps of manual gravity separation include: dividing the raw ore into several samples on average, manually re-panning, and then mixing them together to obtain a heavy sand mixed sample.

7. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S2, the leaching agents are trifluoroacetic acid and hydrogen peroxide; the concentration of the trifluoroacetic acid is 0.1-1.0 mol / L, and the concentration of the hydrogen peroxide is 3-15%.

8. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S3, the ratio of the resin 1 to the curing agent 1 is 2:1; in step S4, the curing temperature is 40-50°C.

9. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S6, the ratio of the resin 2 to the curing agent 2 is 2:1, and the curing temperature is 18-22°C.

10. The method for locating the same particle before and after gold immersion according to claim 1, characterized in that: In step S6, the process is: firstly, sandpapers with sizes of 240 mesh, 800 mesh and 1200 mesh are used for grinding for 8 to 12 minutes respectively; and then polishing cloths with particle sizes of 6 um, 3 um and 1 um are used for polishing for 8 to 12 minutes respectively.

Images