Flotation foam sample preparation and detection methods

Abstract

The present application provides a method for preparing a sample of flotation foam and a method for detecting the same, which belongs to the field of process mineralogy. The method for preparing the flotation foam includes the steps of grinding, preparing flotation foam, processing a sample sheet, dipping the foam, spraying glue, and fixing the mold. The present application first uses a small flotation machine to realize a flotation process test consistent with the actual production process, and then uses a sample sheet with a specific structure to sample the flotation foam. The sampling process obtains the flotation foam to the greatest extent while avoiding the mutual overlap of the flotation foams through a rotating operation. Then, the minerals in the flotation foam are initially fixed on the sample sheet by quick-drying glue to prevent them from shifting and overlapping. Finally, the sample sheet is firmly fixed by two solidifications. Under the synergistic effect of the special structure of the sample sheet, the specific sampling method, and the specific fixing method of the sample sheet, a process mineralogy sample with a stable structure and a single-layer arrangement of minerals is obtained, which provides favorable conditions for the subsequent detection process.

Description

Technical Field

[0001] The invention relates to the technical field of process mineralogy, and in particular to a flotation foam sample preparation method and a detection method. Background Art

[0002] Flotation is a widely used mineral processing technology, demonstrating excellent performance for a wide range of mineral resources. Flotation primarily relies on the collision of foam with mineral particles to achieve the recovery of valuable elements. However, the efficiency of these collisions is influenced by numerous factors, including particle diameter and density, bubble diameter, and the fluid environment. Accurately evaluating flotation performance and identifying the factors influencing flotation processes are key research areas in the mineral processing industry.

[0003] Current research on flotation processes primarily relies on image detection and corresponding algorithmic processing techniques. However, the transparency and morphological variability of the flotation foam can affect image quality, leading to errors in the accuracy of analytical results. In contrast, directly sampling the minerals in the flotation foam prior to analysis offers higher accuracy. However, extracting and sampling the flotation foam is a prerequisite for ore research, and preparing samples for process mineralogy research is difficult. Summary of the Invention

[0004] In view of the technical problems existing in the background technology, the present application provides a flotation foam sample preparation method and a detection method, aiming to solve the technical problem that it is difficult to prepare flotation foam samples for process mineralogy research.

[0005] In a first aspect, the present invention provides a method for preparing a flotation foam sample, comprising the following steps:

[0006] S1. Grind 10 to 3000 g of an ore sample to make the content of minerals with a particle size of -0.074 mm in the sample be 50% to 95%, to obtain a sample to be tested;

[0007] S2, placing the sample to be tested obtained in step S1 in a flotation machine, adding water to prepare the slurry, adding flotation reagents, and aerating and stirring to perform a flotation process;

[0008] S3. Evenly apply a dispersant to one side of a pre-cleaned sample sheet and dry it, then advance the sample sheet in one direction in a flotation machine to roll and dip the flotation foam; the two ends of the sample sheet along the advancing direction are respectively referred to as the front end and the rear end; the process of rolling and dipping the flotation foam is as follows: the front end of the sample sheet is tilted at a preset angle into the flotation machine so as to contact the flotation foam on the surface of the flotation machine, and then the sample sheet is continuously rotated so that different parts of the sample sheet from the front to the rear first contact the flotation foam on the surface of the flotation machine during the advancing process and then are rapidly lifted away from the flotation foam until the rear end of the sample sheet is away from the flotation foam;

[0009] S4, placing the sample sheet with the foam-soaked side facing upward, drying and spraying with quick-drying glue, and letting it stand to solidify;

[0010] S5, placing the sample sheet with the foam-soaked side facing upward in a first mold, adding liquid glue to a preset height, vacuuming and curing once, and demolding to obtain a first solidified body;

[0011] S6. Place the first solidified body in a second mold with the side of the sample sheet dipped in foam facing upward, add liquid glue again, shake and solidify for a second time, and obtain a sample to be tested for process mineralogy.

[0012] In the technical solution of the embodiment of the present application, a small flotation machine is first used to implement a flotation process test consistent with the actual production process, and then the flotation foam is sampled using a sample piece with a specific structure. The sampling process uses a rotation operation to obtain the flotation foam to the greatest extent while avoiding the overlap of the flotation foam. Then, the minerals in the flotation foam are preliminarily fixed on the sample piece by quick-drying glue to prevent them from shifting and overlapping. Finally, the sample piece is firmly fixed through two curing processes. Under the synergistic effect of the special structure of the sample piece, the specific sampling method and the specific fixing method of the sample piece, a process mineralogy sample with a stable structure and a single-layer arrangement of minerals is obtained, providing favorable conditions for the subsequent detection process.

[0013] In some embodiments, the surface of the sample sheet in contact with the flotation foam is provided with a plurality of rows of cones with increasing or decreasing bottom circle diameters, and the bottom circle diameters of two adjacent rows of cones change in opposite directions; the bottom circle diameter of each row of cones ranges from 0.1 to 1 mm, and the spacing between the bottom circles of adjacent cones in each row is 0.1 to 0.2 mm.

[0014] In this embodiment, the bottom of the sample preparation sheet is configured as a conical structure, facilitating the capture of flotation foam during sampling. The tapered shape gradually decreases from bottom to top, further securing the flotation foam within the cone. Secondly, the bottom diameters of two adjacent rows of cones are arranged in opposite directions, increasing the number of cones distributed across the sample preparation sheet, enabling the capture of more flotation foam. The captured flotation foam is also dispersed, reducing the risk of flotation foam overlapping.

[0015] In some embodiments, the surface of the sample is pre-polished by sandblasting with 150-250 mesh corundum.

[0016] In this embodiment, the roughness of the sample preparation sheet surface is increased by grinding, thereby increasing the degree of mutual friction between the flotation foam and the sample preparation sheet, making it easier for the flotation foam to contact the sample preparation sheet.

[0017] In some embodiments, in step S3, the preset angle is 30° to 45°; and the time from the front end of the sample making piece contacting the flotation foam to the rear end of the sample making piece leaving the flotation foam is 2 to 5 seconds.

[0018] In this embodiment, the angle at which the sample is inserted into the flotation machine is adjusted to make it easier for the flotation foam to adhere to the sample, and the risk of displacement and overlap of the flotation foam on the sample is further avoided by controlling the sampling time.

[0019] In some embodiments, in step S5, the side wall of the first mold is serrated; and the preset height is not less than 3 mm.

[0020] In this embodiment, the side wall of the first mold is set to be serrated, so that the side wall of the prepared first solidified body is serrated. When liquid glue is added again for secondary curing, the liquid glue added for secondary curing and the first solidified body are interlocked with each other, thereby improving the mutual contact strength between the first solidified body and the liquid glue added for secondary curing, so that the final process mineralogy sample to be tested is an integrated structure, preventing the sample from shifting during the subsequent polishing process.

[0021] In some embodiments, in step S4, the drying is performed at 25-55° C. for 30-60 minutes, the quick-drying glue is 502 glue, and the standing and solidifying time is 5-20 minutes.

[0022] In some embodiments, in step S5 and step S6, the liquid glue is compounded by epoxy resin and curing agent in a volume ratio of (1-2):1, and the amount of liquid glue added in step S5 is 10-16 mL; the amount of liquid glue added in step S6 is 5-10 mL; the material of the sample piece is epoxy resin.

[0023] In some embodiments, in step S3, the sample preparation sheet is pre-washed with ethanol by shaking; the dispersant is a water glass solution or a sodium hexametaphosphate solution with a mass concentration of 1% to 5%; and the drying is performed at 25 to 55° C. for 30 to 60 minutes.

[0024] Secondly, an embodiment of the present application provides a method for detecting flotation foam, in which the process mineralogy sample prepared above is coarsely ground, finely ground and polished once near one side of the sample preparation sheet, and placed in an automatic mineralogical analysis device or a microscope for testing. If the desired mineral sample is not observed, fine grinding and polishing are continued, and repeated until the desired mineral is observed.

[0025] In the technical solution of the embodiment of the present application, on the basis of preparing a process mineralogy sample with stable structure and single-layer distribution of flotation foam, dynamic real-time detection through polishing and continuous observation can make it easier to observe complete minerals and thus improve the accuracy of detection. At the same time, the setting of the conical structure on the sample piece makes it difficult for the minerals to be polished off during the polishing process, thereby improving the accuracy of detection.

[0026] In some embodiments, the abrasive for the first coarse grinding is 100-200 mesh, the abrasive for the first fine grinding is 500-800 mesh, the polishing material for the first polishing is 1-3 μm, and the total time for one grinding and polishing is 1-2 minutes; the abrasive for the continued fine grinding is greater than 800 mesh, the polishing material for the continued polishing is 1-3 μm, and the total time for continued grinding and polishing is 1-2 minutes.

[0027] 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

[0028] To more clearly illustrate the technical solution of this application, the following is a brief introduction to the drawings used in this application. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0029] Figure 1 This is a flow chart of the sample preparation method of flotation foam in the embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure of the sample prepared in the embodiment of this application;

[0031] Figure 3 This is a cross-sectional view of the first mold in the embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the secondary curing process in an embodiment of the present application;

[0033] Figure 5 This is a micrograph of the flotation foam in a cone structure on the sample prepared in Example 1 of the present application, with a scale of 50 μm;

[0034] Figure 6 For Example 1 of this application Figure 5 The same sample is different Figure 5 Micrograph of another flotation foam in a conical structure. Scale bar: 50 μm.

[0035] Description of reference numerals: 1 - sample piece; 2 - handle; 3 - first mold; 4 - second mold. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "several" is more than two, unless otherwise clearly and specifically defined.

[0039] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "front" and "rear" is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0041] Although directly sampling the minerals in the flotation foam and then analyzing and detecting them is more accurate than studying the flotation process through image detection technology and corresponding algorithm processing, the prerequisite for studying the ore is to extract and sample the flotation foam, and preparing flotation foam samples for process mineralogy research is relatively difficult.

[0042] In order to solve the technical problem that it is difficult to prepare process mineralogy research samples for flotation foam, the present application provides a flotation foam sampling method and a detection method. The flotation foam sampling method first uses a small flotation machine to realize a flotation process test consistent with the actual production process, then uses a sample preparation piece with a specific structure to sample the flotation foam, and the sampling process obtains the flotation foam to the greatest extent by rotating the operation while avoiding the overlap of the flotation foams, and then the minerals in the flotation foam are initially fixed on the sample preparation piece by quick-drying glue to prevent them from shifting and overlapping, and finally the sample preparation piece is firmly fixed by two curing processes, under the synergistic effect of the special structure of the sample preparation piece, the specific sampling method and the specific fixing method of the sample preparation piece, a process mineralogy sample with a stable structure and a single-layer arrangement of minerals is obtained, which provides favorable conditions for the subsequent detection process. The sampling method of the present invention is simple and efficient; the special sample preparation piece is suitable for a variety of flotation foams; the foam process characteristics are in line with production practice, can reflect the actual state of the flotation foam, can accurately characterize the process characteristics of a certain sample flotation foam, and provide reliable data support for the efficient utilization of such ore resources.

[0043] Please refer to Figure 1 In a first aspect, the present invention provides a method for preparing a flotation foam sample, comprising the following steps:

[0044] S1. Grind 10 to 3000 g of an ore sample to make the content of minerals with a particle size of -0.074 mm in the sample be 50% to 95% to obtain a sample to be tested.

[0045] In this application, the actual production process of mineral processing using a small-scale flotation machine is used as the flotation process to be studied. A flotation process test consistent with the actual production process is conducted in the laboratory. That is, the ore sample is directly floated in the laboratory using a small-scale flotation machine consistent with the actual production process. The sampling amount of the ore depends on the actual situation of the flotation process to be studied, that is, the sampling amount is consistent with the sampling amount of the flotation process to be studied; the fineness of the ore depends on the actual situation of the flotation process to be studied, that is, it is consistent with the ore fineness of the flotation process to be studied. The ore is ground to a certain fineness to fully dissociate the ore, providing favorable conditions for the subsequent flotation process. If the flotation process to be studied is to float the already floated concentrate again, there is no need to grind the ore and the subsequent steps can be carried out directly.

[0046] S2. Place the sample to be tested obtained in step S1 in a flotation machine, add water to prepare the slurry, add flotation reagent, and aerate and stir to perform the flotation process.

[0047] The concentration after slurry adjustment, the flotation reagents added, and the various parameter controls of the flotation process are all consistent with the flotation process for this type of ore in actual production. This further makes the laboratory experiments consistent with the actual production process of the flotation process to be studied, which is in line with actual production, thereby providing data parameters with more reference value for actual production.

[0048] S3. Evenly apply dispersant to one side of the pre-cleaned sample sheet 1 and dry it. Then, hold the sample sheet 1 and move it forward in one direction in the flotation machine to roll and dip the flotation foam. The two ends of the sample sheet 1 along the forward direction are respectively referred to as the front end and the rear end. The process of rolling and dipping the flotation foam is as follows: the front end of the sample sheet 1 is inserted into the flotation machine at a preset angle and contacts the flotation foam on the surface of the flotation machine. Then, the sample sheet 1 is continuously rotated so that during the forward process, different parts of the sample sheet 1 from the front to the back first contact the flotation foam on the surface of the flotation machine and then are quickly lifted away from the flotation foam until the rear end of the sample sheet 1 is away from the flotation foam. That is, during the rolling and dipping flotation process, the sample sheet 1 contacts the flotation foam in sequence from the front to the rear end. When a part of the sample sheet 1 contacts the flotation foam, the part is immediately lifted.

[0049] During the sampling process, first ensure that the sample sheet 1 is inserted into the flotation machine at a certain angle, so that the flotation bubbles can more easily contact the sample sheet 1. At the same time, the sample sheet 1 dips into the flotation foam in a rotating manner during the forward process. While the sample sheet 1 fully contacts the flotation foam for sampling, the flotation foam on the sample sheet 1 is arranged in a single layer to avoid overlapping, providing favorable conditions for subsequent analysis and detection.

[0050] S4. Place the sample piece 1 with the foam-soaked side facing upwards, dry it, and spray quick-drying glue on the foam-soaked side, and let it stand to solidify.

[0051] After drying, the foam-soaked side of the prepared sample sheet 1 is sprayed with quick-drying adhesive to initially fix the minerals floated in the foam in situ, preventing them from shifting or overlapping and affecting subsequent analysis and testing. The spraying operation also allows for the adjustment of the amount of adhesive applied to the sample sheet 1, preventing the shifting or overlapping of minerals caused by excessive adhesive application, further improving the accuracy of analysis and testing.

[0052] S5. Place the sample sheet 1 with the foam-soaked side facing upward in the first mold 3, add liquid glue to a preset height, vacuum and cure once, and obtain a first solidified body after demoulding.

[0053] The first mold 3 is pre-coated with a release agent to facilitate the subsequent demoulding process.

[0054] By adding liquid glue and solidifying it, the mineral on the sample piece 1 is fixed again, and the mineral is firmly adhered to the sample piece 1, which is convenient for subsequent analysis and detection operations.

[0055] S6. Place the first solidified body in the second mold 4 with the sample sheet 1 dipped in foam facing upwards, add liquid glue again, shake and solidify for a second time, and obtain a sample to be tested for process mineralogy.

[0056] The second mold 4 is pre-coated with a release agent to facilitate the subsequent demoulding process.

[0057] Liquid glue is added to the first solidified body again and solidified. Through shaking, the liquid glue continuously enters the gap between the sample piece 1 of the first solidified body and the solidified liquid glue, so that the sample piece 1 in the obtained process mineralogy test sample is in firm contact with the liquid glue, thereby improving the overall stability and preventing the sample piece 1 from shifting during the subsequent polishing process.

[0058] Further, in some embodiments, see Figure 2 The side of the sample sheet 1 that contacts the flotation froth is provided with several rows of cones with increasing or decreasing bottom diameters (the cone apex is located inside the sample sheet 1, and the cone base is located on the surface of the sample sheet 1). The bottom diameters of two adjacent rows of cones change in opposite directions. The bottom diameter of each row of cones ranges from 0.1 to 1 mm, and the spacing between the bottoms of adjacent cones in each row is 0.1 to 0.2 mm, preferably 0.1 mm. The depth of each cone is equal to the diameter of the circle at the bottom of the cone. Figure 2 The middle arrow indicates the direction of movement of the sample sheet 1 during the froth dipping process. A handle 2 is provided on the sample sheet 1 for easy handling, located on the side away from the flotation froth. The cones on the sample sheet 1 are created by rotating cones of varying sizes to varying depths on the sheet 1.

[0059] In the technical solution of the embodiment of the present application, first, the bottom of the sample sheet 1 is set to a conical structure, which is convenient for obtaining flotation foam during the sampling process, and the characteristic of the conical structure gradually decreasing from the bottom to the top makes it more firmly fixed to the flotation foam, so that the flotation foam is firmly fixed in the cone. Secondly, the diameters of the bottom circles of the two adjacent rows of cones are arranged in opposite sizes, so that the number of cones distributed on the sample sheet 1 is greater, more flotation foam can be obtained, and the obtained foam is dispersed, reducing the risk of flotation foam overlapping. Thirdly, the cones on the sample sheet 1 are of different sizes, which can be used for flotation foams of different sizes, thereby improving the universality of the sample sheet 1. In addition, the increasing or decreasing direction of the diameter of the bottom circle of the cone is consistent with the forward direction of the sample sheet 1, which is convenient for obtaining flotation foam.

[0060] Furthermore, in some embodiments, the surface of the sample piece 1 is pre-polished by sandblasting with 150-250 mesh corundum.

[0061] In the technical solution of the embodiment of the present application, the roughness of the surface of the sample sheet 1 is increased by grinding, thereby increasing the degree of mutual friction between the flotation foam and the sample sheet 1, making it easier for the flotation foam to contact the sample sheet 1.

[0062] Furthermore, in some embodiments, in step S3, the preset angle is 30° to 45°; and the time from when the front end of the sample making piece 1 contacts the flotation foam to when the rear end of the sample making piece 1 leaves the flotation foam is 2 to 5 seconds.

[0063] In the technical solution of the embodiment of the present application, by adjusting the angle at which the sample 1 is inserted into the flotation machine, the flotation foam is more likely to adhere to the sample 1. By controlling the sampling time, the risk of flotation foam shifting and overlapping on the sample 1 is further avoided.

[0064] Further, in some embodiments, see Figure 3 In step S5, the first mold 3 is a cylinder made of soft rubber material with a serrated side wall. The preset height is not less than 3mm, that is, the lowest glue line ( Figure 3 The distance between the horizontal line on the upper surface of the first mold 3 and the upper surface of the sample piece 1 is not less than 3 mm.

[0065] In the technical solution of the embodiment of the present application, the side wall of the first mold 3 is set to be serrated, so that the side wall of the prepared first solidified body is serrated, please refer to Figure 4 When liquid glue is added again for secondary curing, the liquid glue added for secondary curing is interlocked with the first solidified body, thereby improving the mutual contact strength between the first solidified body and the liquid glue added for secondary curing, so that the final process mineralogy sample to be tested is an integrated structure, thereby preventing the sample piece 1 from shifting during the subsequent polishing process.

[0066] Furthermore, in some embodiments, in step S4, the drying is performed at 25-55° C. for 30-60 min, the quick-drying glue is 502 glue, and the standing and solidifying time is 5-20 min.

[0067] Furthermore, in some embodiments, in step S5 and step S6, the liquid glue is compounded by epoxy resin and curing agent in a volume ratio of (1-2):1, and the amount of liquid glue added in step S5 is 10-16 mL; the amount of liquid glue added in step S6 is 5-10 mL; the material of the sample piece 1 is epoxy resin.

[0068] In the technical solution of the embodiment of the present application, the material of the sample piece 1 is set to epoxy resin, which is close to the composition of liquid glue and will not be confused with minerals during testing and analysis.

[0069] Furthermore, in some embodiments, in step S3, the sample sheet 1 is pre-cleaned with ethanol by shaking; the ethanol shaking cleaning is specifically placing the sample sheet 1 in a beaker containing 10 to 30 mL of anhydrous ethanol and ultrasonically shaking for 10 to 20 minutes; the dispersant is a water glass solution or a sodium hexametaphosphate solution with a mass concentration of 1% to 5%; and the drying is drying at 25 to 55°C for 30 to 60 minutes.

[0070] Secondly, an embodiment of the present application provides a method for detecting the process mineralogy sample prepared as above, wherein the process mineralogy sample is coarsely ground, finely ground and polished once on one side close to the sample preparation sheet 1, and is placed in an automatic mineralogical analysis device or a microscope for testing. If the desired mineral sample is not observed, fine grinding and polishing are continued, and the process is repeated until the desired mineral is observed.

[0071] On the basis of preparing a process mineralogy sample with stable structure and single-layer distribution of flotation foam, dynamic real-time detection through grinding and continuous observation can make it easier to observe complete minerals and thus improve the accuracy of detection. At the same time, the setting of the conical structure on the sample piece 1 makes it difficult for the minerals to be ground off during the grinding process, thereby improving the accuracy of detection.

[0072] Furthermore, in some embodiments, the abrasive for a coarse grinding is 100-200 mesh, the abrasive for a fine grinding is 500-800 mesh, the polishing material for a polishing is 1-3 μm, and the total time for a grinding and polishing is 1-2 minutes; the abrasive for continued fine grinding is greater than 800 mesh, the polishing material for continued polishing is 1-3 μm, and the total time for continued grinding and polishing is 1-2 minutes.

[0073] Some specific examples are listed below. It should be noted that the examples described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in this area or the product specifications are used. Reagents or instruments used without manufacturer's indication are all commercially available conventional products.

[0074] Example 1

[0075] A method for preparing a flotation foam sample is described using gold concentrate obtained by flotation-roughing as an example, and includes the following steps:

[0076] S1. Take 51.50g of gold concentrate as the sample to be tested without grinding.

[0077] S2. Place the sample to be tested in step S1 in a flotation machine, add water to prepare the slurry, add flotation reagent, and aerate and stir to perform the flotation process.

[0078] Among them, the slurry mass concentration after adding water to adjust the slurry is 27.59%, and the flotation reagents are copper sulfate 200g / t, butyl xanthate + butyl ammonium black medicine 80g / t + 40g / t, and MIBC (methyl isobutyl carbinol) 20g / t.

[0079] S3. Place the sample piece 1 in a beaker containing 20 mL of ethanol and ultrasonically vibrate for 15 minutes for cleaning. Dry it at 30°C for 30 minutes. Evenly apply a 2% water glass solution on one side of the sample piece 1. Then dry it at 50°C for 30 minutes.

[0080] A sample piece 1 was held and advanced in a flotation cell in one direction to roll and dip into the flotation foam. The rolling and dipping process involved inserting the front end of the sample piece 1 into the cell at a 30° angle (i.e., the angle between the sample piece 1 and the horizontal plane was 30°) and contacting the flotation foam on the cell surface. The sample piece 1 was then continuously rotated so that, as it advanced, different portions of the sample piece 1, from the front to the back, first contacted the flotation foam on the cell surface and were then rapidly lifted away from the foam until the back end of the sample piece 1 was clear of the foam. The time from the front end of the sample piece 1 contacting the flotation foam to the back end of the sample piece 1 leaving the foam was 4 seconds. The bottom diameter of each column of cones in the sample piece 1 ranged from 0.1 to 1 mm, and the spacing between the bottom circles of adjacent cones in each column was 0.1 mm. The surface of the sample piece 1 was previously sandblasted with 200-grit corundum.

[0081] S4. Place the sample sheet 1 with the foam-soaked side facing upwards, dry it at 30°C for 30 minutes, spray it with 502 glue using a small spray bottle, and let it stand to solidify for 5 minutes.

[0082] S5. Place the prepared sample sheet 1 with the foam-soaked side facing up in the first mold 3. Add liquid glue to a preset height, evacuate and cure once, and demold to obtain a first solidified body. The preset height is 3 mm. The liquid glue is prepared by compounding epoxy resin and curing agent in a volume ratio of 2:1. The amount of liquid glue added is 15 mL.

[0083] S6. Place the first solidified body in the second mold 4 with the foam-soaked side of the sample sheet 1 facing upward. Liquid glue is added again and shaken for secondary curing to obtain a sample for process mineralogy testing. The liquid glue is prepared by compounding epoxy resin and curing agent in a volume ratio of 2:1. The amount of liquid glue added is 8 mL.

[0084] The process mineralogy sample prepared in Example 1 was subjected to a coarse grinding, a fine grinding, and a polishing on the side close to the sample preparation sheet 1, and then placed under a microscope (DM2500P microscope of Leica Corporation) for observation. If the desired mineral sample was not observed, the sample was further finely ground and polished once. The desired mineral was observed under a magnification of 200 times under reflective conditions. Figure 5 and Figure 6 As shown, it is a micrograph of the cone structure at different positions of the same sample 1. Figure 5 There are gangue minerals and metal sulfides in the flotation foam. Figure 6 There are metal sulfides in the flotation foam. Figure 5 and Figure 6 The minerals in the flotation foam are not squeezed against each other and the minerals do not overlap.

[0085] Among them, the abrasive for the first coarse grinding is 150 mesh, the abrasive for the first fine grinding is 600 mesh, the polishing material for the first polishing is 2 μm, and the total time for one grinding and polishing is 1 minute; the abrasive for continued fine grinding is 850 mesh, the polishing material for continued polishing is 2 μm, and the total time for continued grinding and polishing is 1 minute.

[0086] Comparative Example 1

[0087] A method for preparing a sample of flotation foam is provided. Compared with Example 1, the difference is that in step S3, the sample sheet 1 is directly placed horizontally on the flotation foam, and the placement time is the same as the time from the front end of the sample sheet 1 contacting the flotation foam to the rear end of the sample sheet 1 leaving the flotation foam in Example 1. The rest is roughly the same as Example 1 and will not be repeated here.

[0088] The process mineralogy test sample prepared in Comparative Example 1 was analyzed and tested (using the same method as Example 1). It was found that different minerals in the flotation foam squeezed each other and the minerals overlapped significantly, which could not reflect the characteristics of the flotation foam.

[0089] Comparative Example 2

[0090] A method for preparing a sample of flotation foam is provided. Compared with Example 1, the difference is that in step S3, the sample preparation sheet 1 is inserted into the flotation machine at an angle of 60° and contacts the flotation foam on the surface of the flotation machine. The rest is substantially the same as Example 1 and will not be repeated here.

[0091] Analysis and testing of the process mineralogy sample prepared in Comparative Example 2 (using the same method as Example 1) revealed poor front-end foam fixation. This may be because the sample sheet 1 was inserted into the flotation machine at a large angle, preventing its front end from making good contact with the flotation foam, thus affecting the capture of the flotation foam.

[0092] Comparative Example 3

[0093] A method for preparing a sample of flotation foam is provided. Compared with Example 1, the difference is that in step S3, the cone on the sample preparation sheet 1 is replaced with a sphere. The rest is substantially the same as Example 1 and will not be described again.

[0094] The process mineralogy test sample prepared in Comparative Example 3 was analyzed and tested (using the same method as in Example 1). It was found that the minerals in the flotation foam were significantly overlapped, which did not well reflect the characteristics of the flotation foam. This indicates that the spherical structure has poor selectivity for flotation foam, allowing multiple flotation foams to be attached to the same sphere at the same time.

[0095] Comparative Example 4

[0096] A method for preparing a sample of flotation foam is different from that of Example 1 in that, in step S3, no structure is provided on the sample preparation sheet 1, that is, it is a horizontal surface. The rest is substantially the same as that of Example 1 and will not be described in detail here.

[0097] The process mineralogy sample prepared in Comparative Example 4 was analyzed and tested (the method was the same as that in Example 1). No foam morphology was observed, indicating that the sample sheet 1 was unable to capture the flotation foam well.

[0098] Comparative Example 5

[0099] A method for preparing a sample of flotation foam is different from that of Example 1 in that, in step S4, a large amount of 502 glue is sprayed on the sample preparation sheet 1. The rest is substantially the same as that of Example 1 and will not be described in detail here.

[0100] Analysis of the process mineralogy samples prepared in Comparative Example 5 (using the same method as in Example 1) revealed that the minerals in the flotation froth were squeezed together and overlapped significantly. This was primarily due to the large-scale application of 502 glue, which caused the minerals attached to the sample sheet 1 to shift relative to each other and overlap.

[0101] Comparative Example 6

[0102] A method for preparing a sample of flotation foam is provided. Compared with Example 1, the difference is that in step S3, double-sided tape is pre-adhered to the sample preparation sheet 1, and the spraying of quick-drying glue in step S4 is not performed. The rest is substantially the same as Example 1 and will not be repeated here.

[0103] The process mineralogy sample prepared in Comparative Example 6 was analyzed and tested (using the same method as in Example 1). It was found that the foam morphology was poor and the mineral distribution was uneven. This was mainly because the presence of double-sided tape seriously affected the contact and friction between the flotation foam and the sample preparation sheet 1 during the sample preparation process.

[0104] Example 2

[0105] A method for preparing a flotation foam sample is described using molybdenum ore as an example, comprising the following steps:

[0106] S1. Grind 1000 g of an ore sample so that the content of minerals with a particle size of -0.074 mm in the sample is 75%, thereby obtaining a sample to be tested.

[0107] S2. Place the sample to be tested in step S1 in a flotation machine, add water to prepare the slurry, add flotation reagent, and aerate and stir to perform the flotation process.

[0108] Among them, the slurry mass concentration after adding water to adjust the slurry is 32.00%, and the flotation agents are calcium oxide 900g / t, sodium silicate 250g / t, sodium hydrosulfide 50g / t, kerosene + diesel 25g / t + 50g / t, and 2# oil (pine oil, the main component of which is complex higher alcohol) 20g / t.

[0109] S3. Place the sample piece 1 in a beaker containing 20 mL of ethanol and ultrasonically vibrate for 15 minutes for cleaning. Dry it at 30°C for 30 minutes. Evenly apply a 2% water glass solution on one side of the sample piece 1. Then dry it at 50°C for 30 minutes.

[0110] A sample piece 1 was held and advanced in a flotation cell in one direction to roll and dip into the flotation foam. The rolling and dipping process involved inserting the front end of the sample piece 1 into the cell at a 30° angle (i.e., the angle between the sample piece 1 and the horizontal plane was 30°) and contacting the flotation foam on the cell surface. The sample piece 1 was then continuously rotated so that, as it advanced, different portions of the sample piece 1, from the front to the back, first contacted the flotation foam on the cell surface and were then rapidly lifted away from the foam until the back end of the sample piece 1 was clear of the foam. The time from the front end of the sample piece 1 contacting the flotation foam to the back end of the sample piece 1 leaving the foam was 4 seconds. The bottom diameter of each column of cones in the sample piece 1 ranged from 0.1 to 1 mm, and the spacing between the bottom circles of adjacent cones in each column was 0.1 mm. The surface of the sample piece 1 was previously sandblasted with 200-grit corundum.

[0111] S4. Place the sample sheet 1 with the foam-soaked side facing upwards, dry it at 30°C for 30 minutes, spray it with 502 glue, and let it stand to solidify for 7 minutes.

[0112] S5. Place the prepared sample sheet 1 with the foam-soaked side facing up in the first mold 3. Add liquid glue to a preset height, evacuate and cure once, and demold to obtain a first solidified body. The preset height is 3 mm. The liquid glue is prepared by compounding epoxy resin and curing agent in a volume ratio of 2:1. The amount of liquid glue added is 15 mL.

[0113] S6. Place the first solidified body in the second mold 4 with the foam-soaked side of the sample sheet 1 facing upward. Liquid glue is added again and shaken for secondary curing to obtain a sample for process mineralogy testing. The liquid glue is prepared by compounding epoxy resin and curing agent in a volume ratio of 2:1. The amount of liquid glue added is 8 mL.

[0114] The process mineralogy sample prepared in Example 2 was coarsely ground, finely ground, and polished once on the side close to the sample preparation sheet 1, and then placed under a microscope (DM2500P microscope from Leica Corporation) for observation. If the desired mineral sample was not observed, fine grinding and polishing were continued three times, and the desired mineral was observed under reflective conditions at a magnification of 200 times.

[0115] Among them, the abrasive for the first coarse grinding is 150 mesh, the abrasive for the first fine grinding is 600 mesh, the polishing material for the first polishing is 2 μm, and the total time for one grinding and polishing is 1 minute; the abrasive for continued fine grinding is 850 mesh, the polishing material for continued polishing is 2 μm, and the total time for continued grinding and polishing is 1 minute.

[0116] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for preparing a flotation foam sample, characterized in that: The steps include: S1. Grind 10-3000 g of an ore sample to make the content of minerals with a particle size of -0.074 mm in the sample be 50%-95% to obtain a sample to be tested; S2, placing the sample to be tested obtained in step S1 in a flotation machine, adding water to prepare the slurry, adding flotation reagents, and aerating and stirring to perform a flotation process; S3. Evenly apply a dispersant to one side of a pre-cleaned sample sheet and dry it, then advance the sample sheet in one direction in a flotation machine to roll and dip the flotation foam; the two ends of the sample sheet along the advancing direction are respectively referred to as the front end and the rear end; the process of rolling and dipping the flotation foam is as follows: the front end of the sample sheet is tilted at a preset angle into the flotation machine so as to contact the flotation foam on the surface of the flotation machine, and then the sample sheet is continuously rotated so that different parts of the sample sheet from the front to the rear first contact the flotation foam on the surface of the flotation machine during the advancing process and then are rapidly lifted away from the flotation foam until the rear end of the sample sheet is away from the flotation foam; S4, placing the sample sheet with the foam-soaked side facing upward, drying and spraying with quick-drying glue, and letting it stand to solidify; S5, placing the sample sheet with the foam-soaked side facing upward in a first mold, adding liquid glue to a preset height, vacuuming and curing once, and demolding to obtain a first solidified body; S6. placing the first solidified body in a second mold with the side of the sample sheet dipped in foam facing upward, adding liquid glue again, and shaking for secondary solidification to obtain a sample to be tested for process mineralogy; The surface of the sample sheet in contact with the flotation foam is provided with a plurality of rows of cones with increasing or decreasing bottom diameters, and the bottom diameters of two adjacent rows of cones change in opposite directions; the bottom diameter of each row of cones ranges from 0.1 to 1 mm, and the spacing between the bottom circles of adjacent cones in each row is 0.1 to 0.2 mm.

2. The method for preparing a flotation foam sample according to claim 1, wherein: The surface of the sample was sandblasted with 150-250 mesh corundum in advance.

3. The method for preparing a flotation foam sample according to claim 1, wherein: In step S3, the preset angle is 30° to 45°; and the time from the front end of the sample making piece contacting the flotation foam to the rear end of the sample making piece leaving the flotation foam is 2 to 5 seconds.

4. The method for preparing a flotation foam sample according to claim 1, wherein: In step S5, the side wall of the first mold is serrated; and the preset height is not less than 3 mm.

5. The method for preparing a sample of flotation foam according to claim 1, wherein: In step S4, the drying is carried out at 25-55° C. for 30-60 min, the quick-drying glue is 502 glue, and the standing and solidifying time is 5-20 min.

6. The method for preparing a flotation foam sample according to claim 1, wherein: In step S5 and step S6, the liquid glue is compounded by epoxy resin and curing agent in a volume ratio of (1~2):

1. The amount of liquid glue added in step S5 is 10~16mL; the amount of liquid glue added in step S6 is 5~10mL; the material of the sample is epoxy resin.

7. The method for preparing a flotation foam sample according to claim 1, wherein: In step S3, the sample sheet is preliminarily cleaned by shaking with ethanol; the dispersant is a water glass solution or a sodium hexametaphosphate solution with a mass concentration of 1% to 5%; and the drying is performed at 25 to 55° C. for 30 to 60 minutes.

8. A method for detecting flotation foam, characterized in that: The process mineralogy sample prepared according to any one of claims 1 to 7 is subjected to a coarse grinding, a fine grinding and a polishing on one side close to the sample preparation sheet, and is placed under an automatic mineralogical analysis device or a microscope for testing. If the desired mineral sample is not observed, fine grinding and polishing are continued, and the process is repeated until the desired mineral is observed.

9. The method for detecting flotation foam according to claim 8, characterized in that: The abrasive for the first coarse grinding is 100-200 mesh, the abrasive for the first fine grinding is 500-800 mesh, the polishing material for the first polishing is 1-3 μm, and the total time for one grinding and polishing is 1-2 minutes; the abrasive for the continued fine grinding is greater than 800 mesh, the polishing material for the continued polishing is 1-3 μm, and the total time for continued grinding and polishing is 1-2 minutes.

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