Method for detecting galvanic effect between sulfide minerals in ore

Abstract

The application discloses a detection method for galvanic effect between sulfide minerals in ores, comprising the following steps: S1, making a target ore slice and calibrating a three-dimensional coordinate system; S2, polishing and grinding the target ore slice to obtain mineral element distribution information in the target mineral slice; S3, determining the coordinates of the target mineral according to the mineral element distribution information; S4, making a mineral electrode based on the target ore slice; S5, polishing and grinding the mineral electrode, and then detecting the electrochemical behavior of sulfide minerals in the mineral electrode according to the coordinates of the target mineral to obtain the galvanic effect information between the sulfide minerals. The technical scheme disclosed by the application can accurately identify the distribution of target sulfide minerals in ores, realize electrochemical detection of the unoxidized surface of the sulfide minerals, reveal and control the electrochemical reaction in sulfide mineral grinding, and further improve the mineral flotation separation effect, so that the application has great application prospect.

Description

Technical Field

[0001] This invention relates to the field of mineral surface chemical property detection technology, and more specifically, to a method for detecting the galvanic effect among sulfide minerals in ores. Background Technology

[0002] Sulfide minerals typically possess semiconductor properties. Due to their differing electrostatic potentials, they form tiny electrochemical cells upon contact in the pulp. Minerals with higher potential act as the anode and are oxidized, while those with higher potential act as the cathode and are reduced. The strength of the galvanic reactions between sulfide minerals and between sulfide minerals and the grinding media influences the corrosion rate, surface properties, and flotation behavior of the sulfide minerals. Therefore, a deeper understanding of the galvanic reaction mechanism and influencing factors of sulfide minerals is beneficial for guiding the optimization of grinding and flotation processes, thereby improving mineral resource utilization.

[0003] Currently, for pure sulfide mineral samples, the galvanic effect between different sulfide minerals is relatively easy to detect because the minerals remain homogeneous over a large area. However, due to the high purity of the test samples, the experimental data obtained in this way cannot effectively guide on-site production. Ores in the production and processing process often consist of multiple minerals in contact. Due to the galvanic effect, the reactivity of one sulfide mineral can be influenced by multiple intergrowth minerals. Developing a detection method for the galvanic effect between sulfide minerals in actual ores can better reflect the real environment of grinding and flotation processes, and the resulting experimental data can more effectively guide mineral flotation separation practices.

[0004] However, the minerals embedded in ores are often very fine, typically less than a few hundred micrometers. Electrochemical workstations detect the entire ore sample, making it impossible to obtain electrochemical property data for only a single mineral. While micro-area electrochemical microscopy can focus the probe to a sufficiently small field of view, it cannot determine the specific mineral species within the scanned field. In recent years, there have been reports of using laser etching planar coordinate systems on ore surfaces to observe the surface morphology of oxidized minerals such as carbonates. Compared to morphological observation, accurate identification and localization of different mineral types requires a sufficiently precise coordinate system. Furthermore, sulfide minerals are easily oxidized, and the surface area that a planar coordinate system can identify is often the oxide layer of sulfide minerals, failing to capture the electrochemical behavior of native sulfide minerals. This necessitates an etching scheme that can also remove the oxide layer of sulfide minerals.

[0005] Therefore, how to provide a method for detecting the galvanic effect among sulfide minerals in ores, which can accurately identify the distribution of target sulfide minerals in ores and realize the electrochemical detection of the unoxidized surface of sulfide minerals, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a method for detecting the galvanic effect among sulfide minerals in ores, which can accurately identify the distribution of target sulfide minerals in ores and achieve electrochemical detection of the unoxidized surfaces of sulfide minerals.

[0007] The technical solution provided by this invention is as follows:

[0008] This invention provides a method for detecting the galvanic effect among sulfide minerals in ore, comprising the following steps: S1, preparing a target ore slice and calibrating the target ore slice with a three-dimensional coordinate system; S2, polishing the target ore slice and then obtaining the mineral element distribution information in the target mineral slice; S3, determining the coordinates of the target mineral based on the mineral element distribution information; S4, then preparing a mineral electrode based on the target ore slice; S5, polishing the mineral electrode and then detecting the electrochemical behavior of the sulfide minerals in the mineral electrode based on the coordinates of the target mineral to obtain the galvanic effect information among the sulfide minerals.

[0009] Furthermore, in a preferred embodiment of the present invention, step S1, the step of preparing the target ore slice includes:

[0010] S101. Select the target ore and perform surface impurity cleaning treatment on the target ore;

[0011] S102. The target ore is cut according to preset parameters to obtain several ore slices. Then, the several ore slices are wrapped and protected with resin, and the surface of the ore slices is polished.

[0012] S103. Based on the surface roughness index requirements, the ore slices are judged to be qualified, and qualified target ore slices are obtained.

[0013] Furthermore, in a preferred embodiment of the present invention, the surface roughness index is specifically required to be within 200 nm in roughness.

[0014] Furthermore, in a preferred embodiment of the present invention, step S1, the step of calibrating the three-dimensional coordinate system of the target ore slice, includes:

[0015] S111, preset the first etching parameters and the second etching parameters;

[0016] S112. Establish a three-dimensional coordinate system by laser etching coordinate axes on the target ore slice;

[0017] S113. Next, according to the first etching parameters, planar coordinate etching lines are drawn in the three-dimensional coordinate system to divide the surface of the target ore slice into several rectangular regions.

[0018] S114. Subsequently, based on the second etching parameters, marking lines of different lengths and depths are drawn in the three-dimensional coordinate system as depth scales.

[0019] Furthermore, in a preferred embodiment of the present invention, the step of calibrating the three-dimensional coordinate system of the ore slice further includes:

[0020] The morphology of the etched surface of the target ore slice sample is characterized by the etching linewidth, line depth, and line spacing. The characterization parameters of the sample are compared with the first etching parameters and the second etching parameters to obtain the target ore slice sample with consistent parameters.

[0021] Furthermore, in a preferred embodiment of the present invention, step S2 further includes:

[0022] S201. Clean the etched target ore slice sample and dry the cleaned target ore slice sample with high-purity nitrogen.

[0023] S202. Using the depth scale as a reference, polish the target ore slice with a polishing cloth inside the glove box to remove the oxide layer on the surface of the target ore slice.

[0024] S203. Perform energy dispersive spectroscopy (EDS) analysis on the polished target ore slice sample, select the target mineral elements for elemental scanning, determine the region where the target mineral is located from the EDS scanning structure, and record the coordinates of the region.

[0025] Furthermore, in a preferred embodiment of the present invention, step S4, the step of fabricating the mineral electrode includes:

[0026] S401. First, a layer of conductive adhesive is placed at the center of the non-etched surface of the target mineral slice, and one end of the wire is attached to the conductive adhesive.

[0027] S402. Select a mold of appropriate size according to the testing requirements;

[0028] S403. Then, the etched surface of the target mineral slice is placed face down in the mold, and the target mineral slice and the wire are cast and fixed using epoxy resin and curing agent to obtain a mineral electrode.

[0029] Furthermore, in a preferred embodiment of the present invention, the step of fabricating the mineral electrode further includes:

[0030] After the wire is installed, a grinding medium is placed between the target mineral slice and the wire. The grinding medium is the same size and thickness as the target mineral slice.

[0031] Furthermore, in a preferred embodiment of the present invention, the epoxy resin and the curing agent are uniformly mixed, and the mixing ratio of the epoxy resin and the fixing agent is 10:3.

[0032] Furthermore, in a preferred embodiment of the present invention, step S5 specifically includes:

[0033] S501. First, the mineral electrode is ultrasonically cleaned, and the cleaned mineral electrode sample is dried with high-purity nitrogen.

[0034] S502. Next, based on the depth scale, polish the etched area on the surface of the mineral electrode inside the glove box using a polishing cloth to remove its surface oxide layer.

[0035] S503. Subsequently, the mineral electrode is connected to an electrochemical workstation. Based on the coordinates of the target mineral region, the detection probe or analysis probe of the characterization technique is positioned at the corresponding coordinates to carry out the detection of the electrochemical behavior of the mineral and obtain information on the galvanic effect between sulfide minerals.

[0036] The present invention provides a method for detecting the galvanic effect among sulfide minerals in ore, comprising the following steps: S1, preparing a target ore slice and calibrating the target ore slice in a three-dimensional coordinate system; S2, polishing the target ore slice and then obtaining the mineral element distribution information in the target mineral slice;

[0037] S3. Determine the coordinates of the target mineral based on the mineral element distribution information; S4. Then, fabricate a mineral electrode based on the target ore slice; S5. Polish the mineral electrode, and then perform electrochemical behavior detection on the sulfide minerals in the mineral electrode based on the coordinates of the target mineral to obtain galvanic effect information between sulfide minerals. The method for detecting the galvanic effect among sulfide minerals in ores provided by this invention can accurately locate target minerals in ores and perform electrochemical detection on the unoxidized surface of sulfide minerals, maximizing the in-situ, authenticity, and homology of the obtained mineral surface chemical property data, thus providing theoretical support for the efficient development and utilization of mineral resources. The method mainly includes five steps: First, for the sulfide minerals requiring electrochemical behavior detection, the corresponding target minerals are selected, and the target ore is cut into slices according to preset parameters to obtain several target ore slices. Then, a three-dimensional coordinate system is calibrated on the target ore slices, i.e., a three-dimensional coordinate system is inscribed on the surface of the target ore slices, so that the ore slices have clear coordinate values. Next, the distribution information of mineral elements in the target mineral slices needs to be determined, and the target element to be detected is obtained through the mineral element distribution information. To determine the distribution of mineral elements, the target mineral slice needs to be polished before obtaining the mineral element distribution information. This polishing process initially removes the oxide layer on the slice surface. Next, based on the mineral element distribution information, the location of the target mineral is determined in the defined three-dimensional coordinate system, achieving precise positioning of the target mineral. After determining the location of the target mineral in the target ore slice, its electrochemical behavior is then detected. Before detection, preparation is required by fabricating a mineral electrode from the target ore slice. After preparing the mineral electrode, it undergoes polishing to remove the oxide layer on the slice surface again. Then, based on the location of the target mineral, the detection equipment is connected to the mineral electrode to perform electrochemical behavior detection, thereby obtaining the galvanic effect information between sulfide minerals in the ore. Therefore, the technical solution involved in this invention, compared with the prior art, can accurately identify the distribution of target sulfide minerals in the ore, achieve electrochemical detection of the unoxidized surface of sulfide minerals, and obtain the galvanic effect information between sulfide minerals. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1This is a flowchart illustrating the steps of the method for detecting the galvanic effect among sulfide minerals in the ore according to an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram illustrating the fabrication of the mineral electrode according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the mineral electrode according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the cutting and etching of the target ore slices according to an embodiment of the present invention;

[0043] Figure 5 This is a depth scan image of the depth scale according to an embodiment of the present invention;

[0044] Figure 6 The images show the scanning electron microscope energy dispersive spectroscopy (SEM) spectra of the target elements Ni, Fe, Cu, and S involved in the embodiments of this invention.

[0045] Figure 7 This is a diagram showing the electrochemical reactivity of the copper-nickel region involved in the embodiments of the present invention. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0047] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0048] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0050] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0051] Please Figures 1 to 7 As shown, this invention provides a method for detecting the galvanic effect among sulfide minerals in ore, comprising the following steps: S1, preparing a target ore slice and calibrating the target ore slice with a three-dimensional coordinate system; S2, polishing the target ore slice and then obtaining the mineral element distribution information in the target mineral slice; S3, determining the coordinates of the target mineral based on the mineral element distribution information; S4, then preparing a mineral electrode based on the target ore slice; S5, polishing the mineral electrode and then performing electrochemical behavior detection on the sulfide minerals in the mineral electrode according to the coordinates of the target mineral to obtain the galvanic effect information among sulfide minerals. The technical solution involved in this invention can accurately identify the distribution of target sulfide minerals in ore, realize the electrochemical detection of the unoxidized surface of sulfide minerals, and obtain the galvanic effect information among sulfide minerals.

[0052] The following detailed description of the method for detecting the galvanic effect among sulfide minerals in ores disclosed in this invention, with specific embodiments, illustrates this method. In this embodiment, copper-nickel sulfide ore is used as the object of implementation. This embodiment provides a method for investigating the galvanic effect among copper-nickel sulfide minerals in copper-nickel ore, which specifically includes the following steps:

[0053] The main elemental composition of the ore used in this embodiment is shown in Table 1:

[0054] Mineral types Cu (wt%) Ni (wt%) Fe (wt%) S(wt%) Other (wt%) Nickel pyrite 2.9 11.9 46.5 37.0 1.7

[0055] Table 1. Original Grade of Ore

[0056] S1. Prepare a slice of the target ore and calibrate the three-dimensional coordinate system of the slice.

[0057] In this embodiment of the invention, step S1 involves preparing a target ore slice for copper-nickel ore, and then marking a three-dimensional coordinate system on the copper-nickel ore slice.

[0058] Specifically, in this embodiment of the invention, step S1, the step of making target ore slices, includes: S101, selecting target ore and cleaning the surface of the target ore to remove impurities; S102, cutting the target ore according to preset parameters to obtain several ore slices, then wrapping the several ore slices with resin for protection, and polishing the surface of the ore slices; S103, judging the ore slices according to the surface roughness index requirements to obtain qualified target ore slices.

[0059] Specifically, in this embodiment of the invention, the surface roughness index is required to be within 200 nm in roughness.

[0060] In this embodiment, in step S1, copper-nickel ore with a cross-sectional area greater than 10mm × 10mm is selected, and the fine mud and impurities on the surface of the ore are cleaned. Then, the actual ore is cut using a petrographic sample cutting machine. Based on the preset parameters of the slice, ore slices with a length and width of 10mm and a thickness of 2mm are cut to prepare several ore slices. Then, the ore slices are wrapped with resin for protection, and the surface of the ore slices is polished using a fully automatic metallographic sample polishing machine, and the surface roughness after polishing is tested. The fully automatic metallographic sample polishing machine used during polishing uses sandpaper with grits of 1200 grit, 2500 grit, 4000 grit, 5000 grit, and 7000 grit, respectively, and the polishing liquid is 0.25μm diamond suspension polishing liquid for polishing for 2 minutes. After polishing the ore slices, suitable target ore slices are screened at 200nm.

[0061] Specifically, in this embodiment of the invention, step S1, the step of calibrating the three-dimensional coordinate system of the target ore slice includes: S111, preset the first etching parameter and the second etching parameter; S112, etch coordinate axes on the target ore slice by laser etching to establish a three-dimensional coordinate system; S113, then, according to the first etching parameter, etch planar coordinate etching lines in the three-dimensional coordinate system to divide the surface of the target ore slice into several rectangular regions; S114, subsequently, based on the second etching parameter, etch marking lines of different lengths and depths in the three-dimensional coordinate system as depth scales.

[0062] In this embodiment, the Keyence MD-T1010 laser etching machine is used to laser etch the target ore slices. The etching laser power is 90kWh, the etching rate is 1500mm / s, the etching time is 65s, and the line spacing is 0.02mm.

[0063] Specifically, in this embodiment of the invention, the first etching parameters are as follows: the total area of ​​the laser etching region is 6250μm×6250μm, the area of ​​the smallest square is 250μm×250μm, the etching line depth is 50μm, the line width is 30μm, and the line width changes to 50μm every 1250μm interval.

[0064] Specifically, in this embodiment of the invention, the second etching parameters are as follows: within the set area, the etching line parameters from top to bottom are: line depth 40μm, line length 1250μm; line depth 30μm, line length 1000μm; line depth 20μm, line length 750μm; line depth 10μm, line length 500μm.

[0065] In this embodiment, the planar coordinate etching lines are based on the first etching parameters, and the depth scale is based on the second etching parameters. The planar coordinate etching lines are used to divide the laser etching area into multiple rectangular regions. These rectangular regions allow for more precise positioning of the target mineral, and the segmented design of the target ore slices also facilitates the acquisition of differences in the electrochemical behavior of the target mineral. The depth scale area at the etching center is as follows: Figure 5 As shown, the depth scale is based on the second etching parameter, and the depth scale is a positioning marker used to determine the depth of the etched surface during the step of removing the oxide layer from the ore surface.

[0066] Specifically, in this embodiment of the invention, the step of calibrating the three-dimensional coordinate system of the ore slice further includes: characterizing the morphology of the etched surface of the etched target ore slice sample, wherein the characterization parameters are the etching line width, line depth, and line spacing, and comparing the characterization parameter data of the sample with the first etching parameter and the second etching parameter to obtain the target ore slice sample with consistent parameters.

[0067] S2. Polish the target ore slice and then obtain the mineral element distribution information in the target mineral slice.

[0068] S3. Determine the coordinates of the target mineral based on the mineral element distribution information.

[0069] In this embodiment, steps S2 and S3 involve using a scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) to perform elemental analysis on the etched area of ​​the ore slice. Subsequently, based on the elemental composition of pyrite, the coordinates of the pyrite region are determined.

[0070] Specifically, in this embodiment of the invention, step S2 further includes: S201, cleaning the etched target ore slice sample and drying the cleaned target ore slice sample with high-purity nitrogen; S202, using the depth scale as a reference, polishing the target ore slice with a polishing cloth in a glove box to remove the oxide layer on the surface of the target ore slice; S203, performing energy dispersive spectroscopy (EDS) analysis on the polished target ore slice sample, selecting the target mineral element for elemental scanning, determining the region where the target mineral is located from the EDS scanning structure, and recording the coordinates of the region.

[0071] Specifically, in this embodiment of the invention, in S201, the step of cleaning the etched target ore slice sample is as follows: the target ore slice is placed in a beaker of anhydrous ethanol, and an ultrasonic cleaner is placed in the beaker for ultrasonic treatment for 5 minutes.

[0072] Specifically, in an embodiment of the present invention, in S202, the cleaned ore slices are polished in a glove box using a 20,000-mesh polishing cloth until the 10μm depth scale disappears.

[0073] In step S2, scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS) is used to analyze and obtain the elemental distribution information of the target mineral. In this embodiment, the constituent elements Ni, Fe, and S of nickel pyrite are selected for surface scanning. The location of nickel pyrite in the ore sample is determined from the elemental surface scanning results, and the coordinates of this location are recorded. The SEM energy dispersive spectroscopy analysis diagrams of the target elements Ni, Fe, Cu, and S in this embodiment are shown below. Figure 6 As shown, this allows us to determine the location of the copper-nickel associated region.

[0074] S4. Next, a mineral electrode is fabricated based on the target ore slice.

[0075] Specifically, in this embodiment of the invention, step S4, the step of fabricating the mineral electrode includes: S401, firstly, setting a layer of conductive adhesive at the center of the non-etched surface of the target mineral slice, and attaching one end of the wire to the conductive adhesive; S402, selecting a mold of appropriate size according to the testing requirements; S403, then placing the etched surface of the target mineral slice downwards in the mold, and using epoxy resin and curing agent to cast and fix the target mineral slice and the wire to obtain the mineral electrode.

[0076] Specifically, in this embodiment of the invention, the epoxy resin and the curing agent are uniformly mixed, and the mixing ratio of the epoxy resin and the fixing agent is 10:3.

[0077] In this embodiment, a cylindrical mold with a diameter of 25 mm and a height of 20 mm is selected according to the model of the scanning electrochemical microscope used. Then, epoxy resin and curing agent are mixed in a ratio of 10:3, stirred evenly, and poured into the mold. After being placed at room temperature for 3 hours, the mineral electrode is obtained after it has been fixed.

[0078] Specifically, in this embodiment of the invention, the step of fabricating the mineral electrode further includes: after the wire is installed, a grinding medium is placed between the target mineral slice and the wire, wherein the grinding medium is the same size and thickness as the target mineral slice.

[0079] See details Figure 2 As shown, in an embodiment of the present invention, the main structure of the mineral electrode consists of the target ore slice 1, conductive adhesive 2, wire 3, and grinding media 4; the upper surface of the target ore slice 1 is laser etched, the conductive adhesive 2 is disposed on the non-etched surface of the target ore slice 1, the wire 3 is connected to the target ore slice 1 through the conductive adhesive 2, and the grinding media 4 is disposed below the conductive adhesive 2 to meet different detection purposes.

[0080] S5. Polish the mineral electrode, and then perform electrochemical behavior detection on the sulfide minerals in the mineral electrode according to the coordinates of the target mineral to obtain information on the galvanic effect between sulfide minerals.

[0081] Specifically, in this embodiment of the invention, step S5 includes: S501, firstly, ultrasonically cleaning the mineral electrode, and then drying the cleaned mineral electrode sample with high-purity nitrogen; S502, then, based on the depth scale, polishing the etched area on the surface of the mineral electrode with a polishing cloth in a glove box to remove its surface oxide layer; S503, subsequently, connecting the mineral electrode to an electrochemical workstation, and based on the coordinates of the target mineral region, positioning the detection probe or analysis probe of the characterization technique to the corresponding coordinates, conducting electrochemical behavior detection of the mineral, and obtaining galvanic effect information between sulfide minerals.

[0082] Specifically, in the embodiments of the present invention, the characterization techniques include: scanning electrochemical microscopy, microarea electrochemical impedance spectroscopy, and scanning Kelvin probe technique.

[0083] Specifically, in this embodiment of the invention, in step S502, the etched surface of the cleaned electrode sample is polished with 20,000-grit sandpaper inside a glove box until the 20μm depth scale disappears, thus removing the surface oxide layer.

[0084] Specifically, in this embodiment of the invention, the steps for detecting the electrochemical behavior of minerals include: pretreating the mineral motor with flotation reagents and then connecting it to the electrochemical workstation; using a probe to locate the associated region of the target mineral; determining the working voltage value and using the probe to create an approximation curve to determine the distance between the probe and the electrode sample surface; fixing the probe distance and the set scanning area, and performing an electrochemical reaction activity scan on the set area to obtain the electrochemical reaction activity information of the target mineral.

[0085] In this embodiment, the electrochemical behavior detection of minerals specifically involves placing the electrode sample on the stage of the VersaSCAN micro-area electrochemical testing system for scanning electrochemical microscopy (SEM). In this embodiment, the SEM steps include: first, preparing a solution containing 0.01 mol / L potassium ferricyanide and 0.1 mol / L potassium chloride, immersing the electrode sample in the stage, and connecting the electrochemical workstation; selecting a 10 μm diameter platinum wire probe and positioning it in the copper-nickel sulfide ore associated region identified in S230; using a voltage of 0.5 V, plotting an approximation curve to determine the probe distance from the sample surface as 25 μm; fixing the probe distance at 25 μm, setting the probe scanning area to 500 μm * 500 μm, the scanning speed to 20 μm / s, and the scanning step size to 5 μm, and scanning the electrochemical reaction active surface of the copper-nickel region. The resulting electrochemical reaction activity map is shown below. Figure 7 As shown.

[0086] In summary, the present invention relates to a method for detecting the galvanic effect among sulfide minerals in ores. By using laser etching technology to etch a coordinate system on the surface of the ore, combined with energy dispersive spectroscopy (EDS) analysis, the coordinates of various minerals in the ore sample can be determined, thereby achieving accurate positioning of mineral distribution in actual ores. Furthermore, electrodes suitable for micro-area detection technology can be fabricated using the etched sample, and the probe can be placed at the coordinates of the mineral to be studied according to the testing requirements, thus allowing the investigation of the galvanic effect among sulfide minerals. The method for detecting the galvanic effect among sulfide minerals in ore provided by this invention can accurately locate target minerals in ore and perform electrochemical detection on the unoxidized surface of sulfide minerals. Since the different mineral phases studied are located on the same ore sample, the consistency of processing conditions for different mineral phases can be ensured, maximizing the in-situ, authentic, and homogeneous nature of the obtained mineral surface chemical property data, providing theoretical support for the efficient development and utilization of ore resources. The method mainly includes five steps: First, for the sulfide minerals requiring electrochemical behavior detection, the corresponding target mineral is selected, and the target ore is cut into slices according to preset parameters to obtain several target ore slices. Then, a three-dimensional coordinate system is calibrated on the target ore slices, i.e., a three-dimensional coordinate system is inscribed on the surface of the target ore slices, so that the ore slices have clear coordinate values. Then, the distribution information of mineral elements in the target mineral slices needs to be determined. The distribution of the target element to be detected is obtained through the mineral element distribution information. Before obtaining the mineral element distribution information, the target mineral slice needs to be polished to initially remove the oxide layer on the slice surface. Next, based on the mineral element distribution information, the location of the target mineral is determined in the depicted three-dimensional coordinate system to achieve precise positioning of the target mineral. After determining the location of the target mineral in the target ore slice, the electrochemical behavior of the target mineral is then detected. Before detection, detection preparation is required, that is, the target ore slice is made into a mineral electrode. After the mineral electrode is prepared, it needs to be polished again to remove the oxide layer on the slice surface. Then, according to the location of the target mineral, it is connected to the detection equipment, and the electrochemical behavior of the mineral electrode is detected to obtain the galvanic effect information between sulfide minerals in the ore. Therefore, the technical solution involved in this invention, compared with the prior art, can accurately identify the distribution of target sulfide minerals in the ore, realize the electrochemical detection of the unoxidized surface of sulfide minerals, and obtain the galvanic effect information between sulfide minerals.

[0087] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting the galvanic effect among sulfide minerals in ore, characterized in that, Includes the following steps: S1. Prepare target ore slices and calibrate the three-dimensional coordinate system of the target ore slices; S2. Polishing and grinding the target ore slice to obtain mineral element distribution information in the target ore slice; S3. Determine the coordinates of the target mineral based on the mineral element distribution information; S4. Fabricate a mineral electrode based on the target ore slice; S5. Polish the mineral electrode, and perform electrochemical behavior detection on the sulfide minerals in the mineral electrode according to the coordinates of the target mineral to obtain information on the galvanic effect between sulfide minerals; In step S1, the step of calibrating the three-dimensional coordinate system of the target ore slice includes: S111, preset the first etching parameters and the second etching parameters; S112. Establish a three-dimensional coordinate system by laser etching coordinate axes on the target ore slice; S113. Based on the first etching parameters, etch planar coordinate etching lines are drawn in the three-dimensional coordinate system to divide the surface of the target ore slice into several rectangular regions. S114. Based on the second etching parameters, mark lines with different lengths and depths in the three-dimensional coordinate system as depth scales; Step S2 further includes: S201. Clean the etched target ore slice sample and dry the cleaned target ore slice sample with high-purity nitrogen. S202. Using the depth scale as a reference, polish the target ore slice with a polishing cloth inside the glove box to remove the oxide layer on the surface of the target ore slice. S203. Perform energy dispersive spectroscopy (EDS) analysis on the polished target ore slice sample, select the target mineral elements for elemental scanning, determine the region where the target mineral is located from the EDS structure, and record the coordinates of the target mineral region; Step S5 specifically includes: S501. The mineral electrode is ultrasonically cleaned, and the cleaned mineral electrode sample is dried with high-purity nitrogen. S502. Based on the depth scale, polish the etched area on the surface of the mineral electrode inside the glove box using a polishing cloth to remove its surface oxide layer. S503. Connect the mineral electrode to an electrochemical workstation. Based on the coordinates of the region where the target mineral is located, position the detection probe or analysis probe of the characterization technique to the corresponding coordinates, carry out the detection of the electrochemical behavior of the mineral, and obtain the galvanic effect information between sulfide minerals.

2. The method for detecting the galvanic effect among sulfide minerals in ore according to claim 1, characterized in that, In step S1, the step of making target ore slices includes: S101. Select the target ore and perform surface impurity cleaning treatment on the target ore; S102. The target ore is cut according to preset parameters to obtain several ore slices. Then, the several ore slices are wrapped and protected with resin, and the surface of the ore slices is polished. S103. Based on the surface roughness index requirements, the ore slices are judged to be qualified, and qualified target ore slices are obtained.

3. The method for detecting the galvanic effect among sulfide minerals in ore according to claim 2, characterized in that, The surface roughness index requires a roughness of less than 200 nm.

4. The method for detecting the galvanic effect among sulfide minerals in ore according to claim 3, characterized in that, The step of calibrating the three-dimensional coordinate system of the ore slices further includes: The morphology of the etched surface of the target ore slice sample is characterized by the etching linewidth, line depth, and line spacing. The characterization parameters of the sample are compared with the first etching parameters and the second etching parameters to obtain the target ore slice sample with consistent parameters.

5. The method for detecting the galvanic effect among sulfide minerals in ore according to claim 1, characterized in that, In step S4, the step of fabricating the mineral electrode includes: S401. A layer of conductive adhesive is placed at the center of the non-etched surface of the target ore slice, and one end of the wire is attached to the conductive adhesive. S402. Select the mold according to the testing requirements; S403. Place the etched surface of the target ore slice downwards in the mold, and use epoxy resin and curing agent to cast and fix the target ore slice and the wire to obtain a mineral electrode.

6. The method for detecting the galvanic effect among sulfide minerals in ore according to claim 5, characterized in that, The steps for fabricating the mineral electrode also include: After the wire is installed, a grinding medium is placed between the target ore slice and the wire. The grinding medium is the same size and thickness as the target ore slice.

7. The method for detecting the galvanic effect among sulfide minerals in ore according to claim 6, characterized in that, The epoxy resin and curing agent are mixed uniformly, and the mixing ratio of epoxy resin and curing agent is 10:3.

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