Method for measuring the grade of intergrown silver minerals of 0.037 mm or more

Abstract

The application provides a method for measuring and calculating the grade of silver minerals above 0.037 mm, and belongs to the technical field of mineral grade detection. The application measures and calculates the silver grade in the sample through screening; measures and calculates the content of silver monomer and silver minerals by leaching, and obtains heavy sand products by gravity separation; the heavy sand products are dyed by fluorescence, and monomer silver minerals are selected; the color of the silver minerals is analyzed by scanning electron microscope point scanning data, and the volume of the monomer silver minerals is obtained by melting, so that the content is calculated; the grade of silver minerals above 0.037 mm is obtained by conversion. The application adopts density medium gravity separation and fluorescent dye tracing to quickly and accurately obtain the target minerals; the actual density of the silver minerals is measured and calculated by introducing a scanning electron microscope instead of the theoretical density, the silver minerals are smelted in a mold, the volume is measured and calculated, and the real metal amount of the silver minerals is obtained, which is closer to the actual value; the calculation error caused by impurities and irregular shape of the mineral particles is reduced; and the calculated grade of the silver minerals is more accurate.

Description

Technical Field

[0001] This invention relates to the field of mineral grade detection technology, specifically to a method for calculating the grade of intercalated silver ore with a thickness of 0.037 mm or more. Background Technology

[0002] Silver is a metal of significant economic value and with wide industrial applications. Accurately determining the metal content of silver minerals is crucial for guiding production and operations during mineral resource development. This is especially true for intercalary silver minerals larger than 0.037 mm, as these minerals exhibit different behaviors and recovery characteristics during beneficiation and smelting. Accurately determining their metal content helps optimize processes, improve silver recovery rates, reduce production costs, and ultimately enhance the economic benefits of mining enterprises.

[0003] Existing methods have certain limitations: ① Traditional chemical analysis methods, such as flame atomic absorption spectrometry, while effectively determining the silver content in mineral samples, suffer from problems such as complex sample decomposition procedures, long processing times, and susceptibility to errors. Furthermore, they are costly and generate significant amounts of waste gas during the reaction, posing risks to the environment and the health of testing personnel. ② Fire assay: While a classic method for determining silver content, fire assays may have limitations in calculating the metallic content of intergrowth silver minerals larger than 0.037 mm. This method requires multiple steps, including high-temperature melting and ash blowing, making the operation complex. It also lacks precision in selective enrichment and accurate determination of intergrowth silver minerals and is susceptible to interference from other individual silver minerals and associated minerals. Therefore, developing an accurate, rapid, simple, and economical method for calculating the metallic content of intergrowth silver minerals larger than 0.037 mm is of significant practical importance and has broad application prospects. Summary of the Invention

[0004] In view of the technical problems existing in the background art, this application provides a method for calculating the grade of intercalated silver ore with a thickness of 0.037 mm or more, aiming to solve the problems of complexity, serious pollution and unstable test results of existing methods for calculating the grade of intercalated silver ore.

[0005] This application provides a method for calculating the grade of intercalated silver ore with a thickness of 0.037 mm or more, comprising the following steps:

[0006] S1. Screening mineral particles larger than 0.037 mm: The mixed mineral sample is subjected to ultrasonic-assisted sieving, and the distribution of the particle size under the sieve is monitored online. After sieving, the sample on the sieve is taken, and the silver grade in the sample on the sieve is measured and recorded as P.

[0007] S2. Calculate the content of silver monomers and intergrowth silver minerals: The sample on the sieve is stirred and leached. After leaching, it is filtered and dried to obtain leaching residue. The silver grade in the leaching residue is measured and recorded as P1. Then the content of silver monomers and intergrowth silver minerals H = (1-P1 / P).

[0008] S3. The density of the gravity-separated mineral is greater than 5.0 g / cm³. 3 Mineral particles: The sample on the sieve is subjected to density medium re-separation to obtain heavy sand product;

[0009] S4. Selecting individual silver minerals larger than 0.037 mm: The heavy sand product is stained with fluorescent dye, and individual silver mineral particles are selected under a fluorescence microscope;

[0010] S5. Colorimetric analysis of individual silver mineral particles: The individual silver mineral particles were observed under a scanning electron microscope, and the content W of each component in the individual silver mineral particles was obtained by analyzing the scanning electron microscope spot scan data. m Then W m = ( ) / n where n=1, 2, ..., N, N represents the number of different individual silver mineral particles, m=1, 2, ..., M, m=1 represents the silver element, and M represents the number of different components in the individual silver mineral particles;

[0011] S6. Determination of Single Silver Mineral Content: Place single silver mineral particles in a mold, melt them at high temperature, and allow them to cool. Calculate the volume of the single silver mineral particles as V. Then, the single silver mineral content D = (V * ρ * W1) / P, ρ = 1 / (∑W m / ρ m ), where ρ is the actual silver density, ρ m The density of different components in a single silver mineral grain;

[0012] S7. Calculate the grade E of intercalated silver minerals larger than 0.037 mm, E = (HD) * P = ((1-P1 / P) - (V*ρ*W) 1.n ) / P)*P; where, W 1.n That is, W m.n When m=1, the silver content in a single silver mineral particle.

[0013] In the technical solution of this application embodiment, silver mineral particles larger than 0.037 mm are screened to calculate the silver grade in the sample; then, the content of individual silver particles and intercalated silver minerals is calculated by leaching, and heavy minerals are obtained by gravity separation; the heavy minerals are then stained with fluorescence to select individual silver minerals; the color of the silver minerals is analyzed by scanning electron microscopy, and then the individual silver minerals are melted to obtain their volume and their content is calculated; finally, the grade of intercalated silver minerals larger than 0.037 mm is calculated. This application uses an EDTA reagent system to leach silver minerals, avoiding the harm to wastewater caused by the toxicity of traditional cyanide methods and the environmental harm caused by the volatilization of toxic gases from other additives; it uses density medium gravity separation and fluorescent dye tracer selection to achieve convenient, fast and accurate acquisition of the target minerals, reducing workload; by introducing scanning electron microscopy to calculate the actual density of silver minerals instead of theoretical density, and by melting silver minerals in a mold for volume calculation, a more accurate true metal content of silver minerals is obtained; the calculation error caused by impurities and irregular shapes of mineral particles is reduced; and the calculated grade of silver minerals is more accurate.

[0014] In some embodiments, in step S1, the sieve mesh size is 400 mesh, and the sieving method is wet sieving.

[0015] In this embodiment, the mineral sample is screened through a 400-mesh sieve, which can initially separate particles with a diameter greater than 0.037 mm from the mineral.

[0016] In some embodiments, in step S1, the power of the ultrasound is 300~500W and the frequency of the ultrasound is 20~40kHz.

[0017] In this embodiment, ultrasonic vibration is used to break up particle agglomerates, ensuring that particles <0.037mm are fully sieved.

[0018] In some embodiments, the step S1, which involves online dynamic monitoring of the distribution of undersize particles, is as follows: using a laser particle size analyzer to detect the undersize particles, and stopping the sieving process when the proportion of particles with a size > 0.037 mm is < 0.5%.

[0019] In this embodiment, the particle size of the sieved particles is monitored online to avoid over-sieving or under-sieving.

[0020] In some embodiments, step S2 includes the following steps: adding a mixture of Na2CO3 and NaHCO3 with a volume ratio of 1:1 and a concentration of 0.1 mol / L to water to adjust the pH value, then adding a leaching agent to obtain a leachate, and then stirring and leaching the sample on the sieve with the leachate at a mass-volume ratio of 1:5 to 1:10 g / mL; the pH value is 8.5 to 9.5.

[0021] In this embodiment, the relative contents of monomers and gold by leaching are obtained; adjusting the pH of the slurry to weak alkalinity can prevent the decomposition of sodium thiosulfate, maintain the stability of the gold leaching reagent, and thus promote the positive leaching reaction and improve the gold dissolution efficiency.

[0022] In some embodiments, the leaching agent includes EDTA at a concentration of 0.05-0.1 mol / L, citric acid at a concentration of 0.01-0.02 mol / L, and sodium thiosulfate at a concentration of 0.01-0.05 mol / L.

[0023] In this embodiment, silver monomers and intergrowth silver minerals can be obtained by leaching silver. Furthermore, the leaching of silver minerals using an EDTA reagent system avoids the harm to wastewater caused by the toxicity of traditional cyanide methods and the environmental harm caused by the volatilization of toxic gases from other additives.

[0024] In some embodiments, the stirring speed is 200-300 rpm.

[0025] In this embodiment, stirring is used to fully mix the reagent with the mineral particles, thereby improving the leaching effect.

[0026] In some embodiments, in step S3, the density medium has a density of 3.32 g / cm³. 3 A mixed solution of diiodomethane and ethanol, wherein the volume percentage of diiodomethane in the mixed solution is 65%.

[0027] In this embodiment, a specific density medium is used for gravity separation, which can remove minerals with a density greater than 5.0 g / cm³. 3 The mineral particles are selected out, and the light impurities are screened out, thereby reducing the workload of subsequent selection of silver monomers and intercalary silver minerals.

[0028] In some embodiments, in step S4, the fluorescent dye includes Rhodamine B.

[0029] In this embodiment, the fluorescent dye Rhodamine B is used to specifically stain the individual silver minerals, while the intergrowths do not fluoresce. Individual silver minerals and intergrowths can be quickly distinguished under a fluorescence microscope, and individual silver mineral particles can be selected out.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Detailed Implementation

[0031] The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] To address the problems of complex calculation methods, severe pollution, and unstable test results in existing methods for determining the grade of intergrowth silver ore, this application provides a method for calculating the grade of intergrowth silver ore larger than 0.037 mm. The method involves screening silver mineral particles larger than 0.037 mm to calculate the silver grade in the sample; then leaching to calculate the content of individual silver particles and intergrowth silver minerals, followed by heavy separation to obtain heavy mineral concentrate; the heavy mineral concentrate is then subjected to fluorescence staining to select individual silver minerals; the color of the silver minerals is analyzed by scanning electron microscopy; subsequently, the individual silver minerals are melted to obtain their volume and their content is calculated; finally, the grade of intergrowth silver ore larger than 0.037 mm is obtained. This application utilizes an EDTA reagent system to leach silver minerals, avoiding the toxic wastewater hazards of traditional cyanidation methods and the environmental harm caused by the volatilization of toxic gases from other additives. It employs density-based gravity separation and fluorescent dye-based tracer selection to achieve convenient, rapid, and accurate acquisition of the target mineral, reducing workload. By introducing scanning electron microscopy to calculate the actual density of the silver mineral instead of the theoretical density, and by smelting the silver mineral in a mold for volume calculation, it obtains a more accurate representation of the actual metallic content of the silver mineral. This reduces calculation errors caused by impurities and irregular shapes in the mineral particles, resulting in a more accurate calculated grade of the silver mineral.

[0034] This application provides a method for calculating the grade of intercalated silver ore with a thickness of 0.037 mm or more, comprising the following steps:

[0035] S1. Screening mineral particles larger than 0.037 mm: The mixed mineral sample is subjected to ultrasonic-assisted sieving, and the distribution of the particle size under the sieve is monitored online. After sieving, the sample on the sieve is taken, and the silver grade in the sample on the sieve is measured and recorded as P.

[0036] S2. Calculate the content of silver monomers and intergrowth silver minerals: The sample on the sieve is stirred and leached. After leaching, it is filtered and dried to obtain leaching residue. The silver grade in the leaching residue is measured and recorded as P1. Then the content of silver monomers and intergrowth silver minerals H = (1-P1 / P).

[0037] S3. The density of the gravity-separated mineral is greater than 5.0 g / cm³. 3 Mineral particles: The sample on the sieve is subjected to density medium re-separation to obtain heavy sand product;

[0038] S4. Selecting individual silver minerals larger than 0.037 mm: The heavy sand product is stained with fluorescent dye, and individual silver mineral particles are selected under a fluorescence microscope;

[0039] S5. Colorimetric analysis of individual silver mineral particles: The individual silver mineral particles were observed under a scanning electron microscope, and the content W of each component in the individual silver mineral particles was obtained by analyzing the scanning electron microscope spot scan data. m Then W m = ( ) / n where n=1, 2, ..., N, N represents the number of different individual silver mineral particles, m=1, 2, ..., M, m=1 represents the silver element, and M represents the number of different components in the individual silver mineral particles;

[0040] S6. Determination of Single Silver Mineral Content: Place single silver mineral particles in a mold, melt them at high temperature, and allow them to cool. Calculate the volume of the single silver mineral particles as V. Then, the single silver mineral content D = (V * ρ * W1) / P, ρ = 1 / (∑W m / ρ m ), where ρ is the actual silver density, ρ m The density of different components in a single silver mineral grain;

[0041] S7. Calculate the grade E of intercalated silver minerals larger than 0.037 mm, E = (HD) * P = ((1-P1 / P) - (V*ρ*W) 1.n ) / P)*P; where, W 1.n That is, W m.n When m=1, the silver content in a single silver mineral particle.

[0042] In the technical solution of this application embodiment, silver mineral particles larger than 0.037 mm are screened to calculate the silver grade in the sample; then, the content of individual silver particles and intercalated silver minerals is calculated by leaching, and heavy minerals are obtained by gravity separation; the heavy minerals are then stained with fluorescence to select individual silver minerals; the color of the silver minerals is analyzed by scanning electron microscopy, and then the individual silver minerals are melted to obtain their volume and their content is calculated; finally, the grade of intercalated silver minerals larger than 0.037 mm is calculated. This application uses an EDTA reagent system to leach silver minerals, avoiding the harm to wastewater caused by the toxicity of traditional cyanide methods and the environmental harm caused by the volatilization of toxic gases from other additives; it uses density medium gravity separation and fluorescent dye tracer selection to achieve convenient, fast and accurate acquisition of the target minerals, reducing workload; by introducing scanning electron microscopy to calculate the actual density of silver minerals instead of theoretical density, and by melting silver minerals in a mold for volume calculation, a more accurate true metal content of silver minerals is obtained; the calculation error caused by impurities and irregular shapes of mineral particles is reduced; and the calculated grade of silver minerals is more accurate.

[0043] Furthermore, in some embodiments, in step S1, the sieve mesh size is 400 mesh, and the sieving method is wet sieving.

[0044] In the technical solution of this application embodiment, the mineral sample is screened through a 400-mesh sieve, which can initially screen out particles with a particle size greater than 0.037 mm in the mineral.

[0045] Furthermore, in some embodiments, in step S1, the power of the ultrasound is 300~500W, and the frequency of the ultrasound is 20~40kHz.

[0046] In the technical solution of this application embodiment, ultrasonic vibration is used to break up particle agglomerates, ensuring that particles <0.037mm are fully sieved.

[0047] Furthermore, in some embodiments, in step S1, the step of online dynamic monitoring of the distribution of undersize particles is as follows: using a laser particle size analyzer to detect the undersize particles, and stopping the sieving when the proportion of particles with a particle size > 0.037 mm is < 0.5%.

[0048] In the technical solution of this application embodiment, the particle size of the sieve is monitored online to avoid over-sieving or under-sieving.

[0049] Further, in some embodiments, step S2, the leaching includes the following steps: adding a mixture of Na2CO3 and NaHCO3 with a volume ratio of 1:1 and a concentration of 0.1 mol / L to water to adjust the pH value, then adding a leaching agent to obtain a leachate, and then stirring and leaching the sample on the sieve with the leachate at a mass-volume ratio of 1:5 to 1:10 g / mL; the pH value is 8.5 to 9.5; and the leaching time is 1 to 2 hours.

[0050] In the technical solution of this application embodiment, the relative contents of monomers and gold by leaching are obtained; adjusting the pH of the slurry to be weakly alkaline can prevent the decomposition of sodium thiosulfate, maintain the stability of the gold leaching reagent, and thus promote the positive progress of the gold leaching reaction and improve the gold dissolution efficiency.

[0051] Furthermore, in some embodiments, the leaching agent includes EDTA at a concentration of 0.05~0.1 mol / L, citric acid at a concentration of 0.01~0.02 mol / L, and sodium thiosulfate at a concentration of 0.01~0.05 mol / L.

[0052] In the technical solution of this application embodiment, silver monomers and intercalated silver minerals can be obtained by leaching silver. Furthermore, the silver minerals are leached using an EDTA reagent system, which avoids the harm to wastewater caused by the toxicity of traditional cyanide methods and the environmental harm caused by the volatilization of toxic gases from other additives.

[0053] Furthermore, in some embodiments, the stirring speed is 200-300 rpm.

[0054] In the technical solution of this application embodiment, stirring is used to fully mix the reagent with the mineral particles, thereby improving the leaching effect.

[0055] Furthermore, in some embodiments, in step S3, the density medium has a density of 3.32 g / cm³. 3 A mixed solution of diiodomethane and ethanol, wherein the volume percentage of diiodomethane in the mixed solution is 65%.

[0056] In the technical solution of this application embodiment, a specific density medium is used for reselection, which can remove minerals with a density greater than 5.0 g / cm³. 3 The mineral particles are selected out, and the light impurities are screened out, thereby reducing the workload of subsequent selection of silver monomers and intercalary silver minerals.

[0057] Furthermore, in some embodiments, in step S4, the fluorescent dye includes Rhodamine B.

[0058] In the technical solution of this application embodiment, the fluorescent dye Rhodamine B is used to specifically stain the single silver minerals, while the intergrowths are non-fluorescent. Under a fluorescence microscope, single silver minerals and intergrowths can be quickly distinguished, and single silver mineral particles can be selected.

[0059] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0060] Example 1

[0061] This embodiment provides a method for calculating the grade of intercalated silver ore with a thickness of 0.037 mm or more, specifically including the following steps:

[0062] (1) Take 1 kg of mixed sample and perform ultrasonic-assisted wet sieving. The sieve is a 400 mesh standard sieve. The ultrasonic power is 400W and the frequency is 30kHz. During the sieving process, the particle size distribution of the particles under the sieve is monitored by a laser particle size analyzer. When the proportion of particles with a particle size > 0.037 mm under the sieve is < 0.5%, the sieving is stopped. The sample on the sieve is dried and the silver grade P in the sample on the sieve is measured to be 72.16 g / t.

[0063] (2) Add a mixture of Na2CO3 and NaHCO3 with a volume ratio of 1:1 and a concentration of 0.1 mol / L to the water to adjust the pH value to 9. Then add 0.1 mol / L EDTA, 0.01 mol / L citric acid and 0.03 mol / L sodium thiosulfate to obtain a leachate. Then, the sample on the sieve and the leachate are stirred and leached at a mass-volume ratio of 1:8 g / mL for 2 hours at a stirring speed of 300 rpm. Then filter and dry to obtain leaching residue. The silver grade in the leaching residue is measured to be P1 = 22.58 g / t. The content of silver monomers and intercalated silver minerals is calculated to be H = (1-P1 / P) = 68.71%.

[0064] (3) Place the above-mentioned sieve samples in a density medium with a density of 3.32 g / cm³. 3 The heavy sand product was obtained by gravity separation in a mixed solution of diiodomethane and ethanol, where the volume percentage of diiodomethane in the mixed solution was 65%.

[0065] (4) The above heavy sand products were stained with Rhodamine B, and the individual silver mineral particles were selected under a fluorescence microscope for later use.

[0066] (5) The above-mentioned single silver mineral particles were observed under a scanning electron microscope, and the content W of each component in the single silver mineral particles was obtained by analyzing the scanning electron microscope spot scan data.m Then W m = ( ) / n, where n=1, 2, ..., N, N represents the number of different individual silver mineral particles, m=1, 2, ..., M, m=1 represents silver element, M represents the number of different components in the individual silver mineral particles. In this embodiment, N=8, M=3. When m=2, it represents copper element, and when m=3, it represents lead element; then W1=( ) / 8= (92.14%+ 91.38%+92.70%+90.34%+89.77%+91.58%+93.02%+90.19%) / 8=91.39%, W2= ( ) / 8 = (3.07% + 3.59% + 2.86% + 3.24% + 3.37% + 2.91% + 3.64% + 3.52%) / 8 = 3.275%, W3 = ( ) / 8=(5.36%+5.43%+5.19%+5.44%+5.28%+5.37%+5.46%+5.15%=5.335%).

[0067] (6) Place the above-mentioned single silver mineral particles into a cylindrical mold with a bottom radius of 1 mm, and melt it at high temperature in a muffle furnace. After cooling, measure the height of the mineral in the mold as 1.0572 mm. The volume of the single silver mineral particles is V = π*1 2 *5.286=16.606mm 3 Then the content of a single silver mineral is D = (V*ρ*W1) / P, ρ = 1 / (∑W m / ρ m ), where ρ is the actual density of silver, ρ1 = 10.6 g / cm³ 3 The value is ρ2 = 8.96 g / cm³. 3 Single, ρ3 = 11.34 g / cm³ 3 Therefore, ρ = 1 / (91.39% / 10.6 + 3.275% / 8.96 + 5.335% / 11.34) = 10.57 g / cm³ 3 , D=(V*ρ*W1) / P=44.44%.

[0068] (7) Calculate the grade E of intercalated silver minerals larger than 0.037 mm, E = (HD) * P = ((1-P1 / P) - (V*ρ*W) 1.n ) / P)*P=(68.71-44.44)%×72.16g / t=17.51g / t.

[0069] In summary, this application provides a method for calculating the grade of intergrowth silver minerals larger than 0.037 mm. The method involves screening silver mineral particles larger than 0.037 mm to calculate the silver grade in the sample; then leaching to calculate the content of individual silver particles and intergrowth silver minerals, followed by heavy separation to obtain heavy mineral concentrates; the heavy mineral concentrates are then subjected to fluorescence staining to select individual silver minerals; the color of the silver minerals is analyzed using scanning electron microscopy; subsequently, the individual silver minerals are melted to obtain their volume and their content is calculated; finally, the grade of intergrowth silver minerals larger than 0.037 mm is calculated. This application utilizes an EDTA reagent system to leach silver minerals, avoiding the toxic wastewater hazards of traditional cyanidation methods and the environmental harm caused by the volatilization of toxic gases from other additives. It employs density-based gravity separation and fluorescent dye-based tracer selection to achieve convenient, rapid, and accurate acquisition of the target mineral, reducing workload. By introducing scanning electron microscopy to calculate the actual density of the silver mineral instead of the theoretical density, and by smelting the silver mineral in a mold for volume calculation, it obtains a more accurate representation of the actual metallic content of the silver mineral. This reduces calculation errors caused by impurities and irregular shapes in the mineral particles, resulting in a more accurate calculated grade of the silver mineral.

[0070] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for estimating the grade of a 0.037 mm or more silver mineral concretion, characterized by, Comprising the following steps: S1. Screening mineral particles above 0.037 mm: ultrasonic-assisted screening of the mixed mineral sample, and online dynamic monitoring of the distribution of undersize particle size, after the screening is completed, taking the oversize sample, measuring the silver grade in the oversize sample, and recording it as P; S2. Measuring the content of silver monomer and associated silver minerals: stirring leaching of the oversize sample, after leaching, filtering, drying to obtain leaching residue, measuring the silver grade in the leaching residue, recording it as P1, then the content H of silver monomer and associated silver minerals = (1-P1 / P); S3. Heavy mineral density greater than 5.0 g / cm 3 of mineral particles: subjecting the oversize sample to density medium gravity separation to obtain a heavy mineral concentrate; S4. Selecting monomer silver minerals above 0.037 mm: dyeing the heavy sand product with a fluorescent dye, and selecting monomer silver mineral particles under a fluorescence microscope. S5. Color analysis of monomer silver mineral particles: the monomer silver mineral particles are observed under a scanning electron microscope, and the content W of each component in the monomer silver mineral particles is obtained by scanning electron microscope point scanning data analysis m , then W m = ( ) / n, wherein n = 1, 2, …, N, N represents the number of different monomer silver mineral particles, m = 1, 2, …, M, m = 1 represents the silver element, and M represents the number of different components in the monomer silver mineral particles; S6. Determination of Single Silver Mineral Content: Place single silver mineral particles in a mold, melt them at high temperature, and allow them to cool. Calculate the volume of the single silver mineral particles as V. Then, the single silver mineral content D = (V * ρ * W1) / P, ρ = 1 / (∑W m / ρ m ), where ρ is the actual silver density, ρ m The density of different components in a single silver mineral grain; S7. Calculate the grade E of the silver mineral intergrowth above 0.037 mm, E = (H - D) * P = ((1 - P1 / P) - (V * p * W 1.n ) / P) * P; wherein, W 1.n W m.n The content of silver in the monomer silver mineral particle when m = 1.

2. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 1, characterized by, In step S1, the screen mesh size of the screening is 400 mesh, and the screening method is wet screening.

3. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 1, characterized by, In step S1, the power of the ultrasonic is 300-500 W, and the frequency of the ultrasonic is 20-40 kHz.

4. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 1, characterized by, In step S1, the step of online dynamic monitoring of the distribution of undersize particle size is: using a laser particle size instrument to detect undersize particle size, when the proportion of undersize particle size > 0.037 mm is < 0.5%, stop screening.

5. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 1, characterized by, In step S2, the leaching includes the following steps: adding a mixed solution of Na2CO3 and NaHCO3 with a concentration of 0.1 mol / L and a volume ratio of 1:1 to water to adjust the pH value, then adding leaching reagents to obtain leaching solution, then stirring and leaching the oversize sample with the leaching solution at a mass / volume ratio of 1:5-1:10 g / mL.

6. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 5, characterized by, The pH value is 8.5-9.

5.

7. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 5, characterized by, The leaching reagents include EDTA with a concentration of 0.05-0.1 mol / L, citric acid with a concentration of 0.01-0.02 mol / L, and sodium thiosulfate with a concentration of 0.01-0.05 mol / L.

8. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 5, characterized by, The stirring speed is 200-300 rpm.

9. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 1, characterized by, In step S3, the density medium is a mixed solution of diiodomethane and ethanol with a density of 3.32 g / cm 3 and a volume ratio of diiodomethane of 65%.

10. The method for estimating the grade of 0.037 mm or more of interlocked silver ore according to claim 1, characterized by, In step S4, the fluorescent dye includes Rhodamine B.

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