Flotation method based on micro-nano bubbles and flotation device

Abstract

The invention relates to a flotation method based on micro-nano bubbles, which comprises the following steps: firstly, introducing bubbles into the bottom of ore pulp to be treated; then, the to-be-treated ore pulp below the liquid level of the to-be-treated ore pulp is subjected to ultrasonic treatment; and finally, foam concentrate generated by combination of bubbles and minerals above the to-be-treated ore pulp is collected, the to-be-treated ore pulp is subjected to ultrasonic treatment, the ore pulp can be effectively dispersed, the gold-bearing minerals can be separated from the ore pulp more easily, the gold-bearing minerals can emerge from the ore pulp through the bubbles, and the recovery rate of the gold-bearing minerals in the ore pulp is effectively increased.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral flotation, and particularly relates to a method and a flotation device based on micro-nano bubble flotation. Background Art

[0002] In recent years, with the continuous development of gold mine resources in China, the easily selectable and low-cost gold mine resources have been exhausted, and some tailings after cyanide leaching have also become objects for development and utilization.

[0003] In the prior art, flotation is usually used to recover gold in cyanide tailings (pulp). However, due to problems such as the overly fine particle size of cyanide tailings (-15μm content > 30%), the floatability of minerals being inhibited by cyanide, the difficulty of bubbles contacting fine-grained gold-bearing minerals, and serious slime of the pulp, the flotation recovery rate of gold in gold-bearing cyanide tailings is low.

[0004] In order to improve the recovery rate of gold, measures such as adding selective flocculants, extending the flotation time, and increasing the reagent dosage are often required during flotation, resulting in high production costs.

[0005] Therefore, there is an urgent need for a method and a flotation device that can effectively improve the gold recovery rate in fine-grained cyanide tailings. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a method based on micro-nano bubble flotation. By performing ultrasonic treatment on the pulp to be treated, bubbles can more easily combine with the gold-bearing minerals in the pulp, effectively improving the gold recovery rate in the pulp.

[0007] To achieve the above object, the present invention provides the following solution:

[0008] A method based on micro-nano bubble flotation includes the following steps:

[0009] Step S1: Introduce bubbles into the bottom of the pulp to be treated;

[0010] Step S2: Perform ultrasonic treatment on the pulp to be treated below the liquid level of the pulp to be treated;

[0011] Step S3: Collect the froth concentrate generated by the combination of bubbles and minerals above the pulp to be treated.

[0012] Preferably, before step S1, pulp preparation to be treated is also included:

[0013] Adjust the pH value, temperature value, and concentration value of the original pulp to obtain the pulp to be treated.

[0014] Preferably, in step S1: The electrolysis method is used to provide bubbles for the pulp to be treated.

[0015] Preferably, step S1 includes:

[0016] Step S11: Introduce bubbles into the bottom of the flotation chamber that has not been filled with the pulp to be treated;

[0017] Step S12: After the bubbles can be continuously and stably supplied, add the pulp to be treated into the flotation chamber.

[0018] Preferably, in step S2, when the liquid level is higher than the ultrasonic generator for ultrasonic treatment of the pulp to be treated, turn on the ultrasonic generator.

[0019] A flotation device includes: a flotation chamber extending in the vertical direction, a bubble generator, and an ultrasonic generator. The bottom of the flotation chamber is connected to the bubble generator. The concentrate collection port of the flotation chamber is arranged at the upper part of the flotation chamber. The ultrasonic generator is installed on the side wall of the flotation chamber, and the ultrasonic generator is located between the bubble generator and the concentrate collection port.

[0020] Preferably, the bubble generator is an electrolytic generator. The electrolytic generator includes a cathode column and an anode column connected to electrodes. An ion exchange channel is arranged between the cathode column and the anode column. A proton exchange membrane is arranged on the ion exchange channel. The upper opening of the cathode column is connected to the bottom of the flotation chamber.

[0021] Preferably, a discharge port is arranged at the bottom of the cathode column, and the electrodes are arranged above the discharge port.

[0022] Preferably, it further includes a pretreatment chamber. A stirrer for stirring the raw pulp is arranged in the pretreatment chamber. The pretreatment chamber is connected to the feed port of the flotation chamber.

[0023] Preferably, a temperature measuring device for measuring the temperature of the raw pulp and a heating device for heating the raw pulp are further arranged in the pretreatment chamber.

[0024] The present invention has achieved the following technical effects compared with the prior art:

[0025] In the method based on micro-nano bubble flotation disclosed in the present application, bubbles are first introduced into the bottom of the pulp to be treated. The bubbles gradually rise from the bottom of the pulp and can combine with the gold-bearing minerals in the pulp to be treated during the rising process to form foam concentrate. By performing ultrasonic treatment on the pulp to be treated, the pulp can be effectively dispersed, making it easier for the gold-bearing minerals to separate from the pulp, so that the bubbles can float the gold-bearing minerals out of the pulp, effectively improving the gold recovery rate of the pulp. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Attached Figure 1 is a schematic diagram of an embodiment of the present invention;

[0028] Among them, 1, flotation chamber; 2, ultrasonic generator; 3, concentrate collection port; 4, cathode column; 5, anode column; 6, proton exchange membrane; 7, ore discharge port; 8, pretreatment chamber; 9, stirrer; 10, feed port; 11, flow pump; 12, heating device; 13, gas discharge port; 14, electrolyte solution discharge port; 15, gas flowmeter; 16, controller. Specific embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] The purpose of the present invention is to provide a method based on micro-nano bubble flotation. By ultrasonically treating the pulp, bubbles can more easily combine with the gold-bearing minerals in the pulp, effectively improving the recovery rate of gold in the pulp.

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0032] In the method based on micro-nano bubble flotation disclosed in the embodiments of the present invention, first, bubbles are introduced into the bottom of the pulp to be treated. The bubbles move upward in the pulp and can combine with the gold-bearing minerals in the pulp to form froth concentrate. The froth concentrate can gradually gather at the top of the pulp under the buoyancy of the bubbles, forming a froth concentrate layer. Then, the pulp to be treated below the liquid level of the pulp to be treated is ultrasonically treated. Finally, the froth concentrate located above the pulp is collected. Through ultrasonic treatment, the dispersibility of the pulp can be effectively improved, making it easier for the gold-bearing minerals to separate from the pulp, so that the bubbles can float the gold-bearing minerals out of the pulp, thereby improving the recovery rate of gold in the pulp. At the same time, the problem that other impurities (substances other than gold-bearing minerals) follow the gold concentrate to reach the froth concentrate layer is avoided, and the grade of the recovered gold is improved.

[0033] Further, the bubbles introduced into the bottom of the pulp to be treated include micro-nano bubbles.

[0034] Those skilled in the art can understand that here, micro-nano bubbles refer to bubbles with a diameter less than 100 microns; more preferably, the content of micro-nano bubbles is not less than 60% of the total amount of bubbles.

[0035] As a preferred embodiment, before introducing the bubbles, it is also necessary to prepare the pulp to be treated, specifically by adjusting the pH value, temperature, and concentration of the original pulp to obtain the pulp to be treated.

[0036] As a preferred embodiment, the electrolysis method is used to provide bubbles for the pulp to be treated. The bubbles obtained by electrolysis have a slow rising speed in water and a longer residence time in the pulp, which allows the bubbles to have more time to fuse with the gold-bearing minerals in the pulp and can more effectively float the gold-bearing minerals out of the pulp.

[0037] As a preferred embodiment, when introducing bubbles into the bottom of the pulp to be treated: first introduce bubbles into the bottom of the flotation chamber without the pulp to be treated. After the bubbles can be continuously and stably supplied, then add the pulp to be treated into the flotation chamber; continuously and stably supplying the bubbles ensures that the bubbles can be evenly distributed in the pulp, increasing the contact opportunity between the bubbles and the gold-bearing minerals, improving the flotation efficiency, and at this time, the bubble size is also relatively uniform, avoiding large bubbles from carrying impurities into the froth concentrate layer. In addition, the uniform bubbles can form a stable froth concentrate layer, which helps to improve the concentrate grade and recovery rate.

[0038] As a preferred embodiment, when ultrasonically treating the pulp to be treated, after waiting for the pulp liquid level to be higher than the ultrasonic generator, then turn on the ultrasonic generator to ultrasonically treat the pulp to be treated, avoiding the ultrasonic waves emitted by the ultrasonic generator from damaging the bubbles in the froth concentrate layer; it can be understood that: at this time, the bubbles rising in the pulp to be treated, due to being below the pulp liquid level, are relatively not easily broken under the liquid pressure of the pulp and are not affected or hardly affected by the ultrasonic device.

[0039] Reference Figure 1, the present invention also discloses a flotation device, comprising: a flotation chamber 1, a bubble generator, and an ultrasonic generator 2. Among them, the chamber of the flotation chamber 1 extends in the up and down direction. The bottom of the flotation chamber 1 is connected to the bubble generator. The concentrate collection port 3 of the flotation chamber 1 is arranged at the upper part of the flotation chamber 1. The ultrasonic generator 2 is installed on the side wall of the flotation chamber 1, and the ultrasonic generator 2 is located between the bubble generator and the concentrate collection port 3. The flotation chamber 1 is used to hold the pulp to be treated. The bubble generator is used to introduce bubbles into the bottom of the flotation chamber 1. The bubbles in the flotation chamber 1 can pass through the pulp from bottom to top and combine with the gold-bearing minerals in the pulp to form froth concentrate. The froth concentrate continuously accumulates above the pulp under the buoyancy of the bubbles, forming a froth concentrate layer. The continuously increasing froth concentrate layer can be discharged from the flotation chamber 1 through the concentrate collection port 3 at the upper part of the flotation chamber 1 for the staff to collect. The ultrasonic waves emitted by the ultrasonic generator 2 can effectively improve the dispersion of the pulp, making it easier for the bubbles to combine with the gold-bearing minerals, achieving the technical effect of improving the recovery rate of gold ore in the pulp.

[0040] Preferably, the bubbles provided by the bubble generator are micro-nano bubbles.

[0041] As a preferred embodiment, the bubble generator is an electrolytic generator. The electrolytic generator includes a cathode column 4 and an anode column 5 connected to the electrodes. An ion exchange channel is arranged between the cathode column 4 and the anode column 5, and a proton exchange membrane 6 is arranged on the ion exchange channel. The upper opening of the cathode column 4 is connected to the bottom of the flotation chamber 1.

[0042] Preferably, a discharge port 7 is arranged at the bottom of the flotation chamber 1. The tailings after flotation will gradually sink, and the tailings can be discharged through the discharge port 7.

[0043] More preferably, the cathode column 4 itself serves as the flotation chamber to hold the pulp to be treated and simultaneously provide bubbles for the pulp to be treated. At this time, the discharge port 7 is arranged at the bottom of the cathode column 4.

[0044] Furthermore, the cathode electrode of the cathode column 4 is arranged at the lower part of the cathode column 4, and the ultrasonic generator 2 is arranged on the side wall of the cathode column 4. The cathode electrode is located below the ultrasonic generator 2.

[0045] It can be understood that: the anode column 5 is also provided with an anode electrode. The cathode electrode and the anode electrode are respectively arranged inside the cathode column 4 and the anode column 5 and can be respectively in contact with the liquid in the cathode column 4 and the anode column 5. A cationic proton exchange membrane 6 is arranged between the cathode column 4 and the anode column 5 to allow hydrogen ions in the anode column 5 to pass through. Preferably, both the cathode electrode and the anode electrode are electrode meshes.

[0046] As a preferred embodiment, the cathode column 4 and / or the anode column 5 are divided into an upper column body and a lower column body, the upper column body and the lower column body are connected to each other, and a rubber ring flange is provided at the interface between the upper column body and the lower column body. The rubber ring flange can clamp the electrode mesh to realize the installation of the electrode mesh.

[0047] As a preferred embodiment, it further includes a pretreatment chamber 8. A stirrer 9 for stirring the raw pulp is arranged in the pretreatment chamber 8, and the pretreatment chamber 8 is communicated with the feed inlet 10 of the flotation chamber 1; more preferably, the pretreatment chamber 8 is a stirring tank. Its working principle is that the raw pulp is added to the pretreatment chamber 8, an appropriate amount of clear water is added to the pretreatment chamber 8 according to the pulp concentration, and the raw pulp is stirred evenly by the stirrer 9 to adjust the concentration of the raw pulp; of course, a pH adjuster can also be added to the raw pulp according to requirements to adjust the pH of the raw pulp; the preferred pH value is 6.5.

[0048] As a preferred embodiment, the cover plate of the stirring tank is two detachable semi-circular steel plates to prevent the pulp from splashing.

[0049] Preferably, a flow pump 11 is arranged on the pipeline between the pretreatment chamber 8 and the feed inlet 10. Specifically, the flow pump 11 is a vertical sand pump.

[0050] Furthermore, a temperature measuring device and a heating device 12 are also arranged in the pretreatment chamber 8; the raw pulp is heated by the heating device 12, and the temperature measuring device can measure the temperature of the raw pulp in real time. When the raw pulp is heated to the target temperature, the heating device 12 stops working. Preferably, the target temperature is in the temperature range of 20-50°C.

[0051] In order to optimize the flotation effect, when pretreating the raw pulp, a flotation activator, a collector and a foaming agent are added to the pretreatment chamber 8, and the raw pulp is fully stirred; the preferred addition amount of the flotation activator is 100-200 g / t; the preferred addition amount of the collector is 50-200 g / t; the preferred addition amount of the foaming agent is 20-100 g / t; the preferred stirring time is 3-10 minutes.

[0052] Furthermore, the flotation activator includes but is not limited to an aqueous solution of copper sulfate and ammonium sulfate; the collector includes but is not limited to ethyl dixanthogen, polyoxybutenol dithiophosphate, mixed fatty acids, RA935; the foaming agent includes but is not limited to pine oil, MIBC, and sec-octanol.

[0053] More preferably, before adding the flotation activator, one or more de-cyanidation activators are added to the pulp to enhance the affinity of specific minerals for flotation reagents, so as to achieve better selectivity during the flotation process and improve the recovery rate of target minerals; the de-cyanidation activators include but are not limited to hydrogen peroxide solutions, sodium hypochlorite solutions, and ozone aqueous solutions with different dilution ratios.

[0054] As a preferred embodiment, a gas discharge port 13 is provided above the anode column 5, and an electrolyte solution discharge port 14 is provided below the anode column 5.

[0055] Furthermore, it further includes a gas flowmeter 15 connected to the gas discharge port 13.

[0056] As a preferred embodiment, it further includes a controller 16 for controlling the DC power supply.

[0057] As a preferred embodiment, before the flotation experiment starts, the stirring tank and the cathode column 4 are cleaned with clean water. The stirring tank is placed on the support frame, the stirrer 9 is adjusted to a suitable height through the hydraulic transmission rod, and the cover plate of the stirring tank body is covered. The electrode mesh is installed and connected to the DC power supply. The anode column 5 is filled with a strong acidic electrolyte solution, and the cathode column 4 is filled with tap water to submerge the electrode mesh. The weighed pulp (cyanide residue after grinding) is added to the stirring tank, tap water is added according to the pulp concentration, and the power supplies of the stirring device, the heating device 12, and the temperature measuring device are turned on. The temperature of the heating device 12 is adjusted to adjust the pulp temperature to the required target temperature. One or several de-cyanation activators are added to the pulp, and the stirrer 9 is adjusted to the target rotation speed. After stirring for a certain time, a pH adjuster is added to adjust the pulp pH to 6.5, and then 100 - 200 g / t of flotation activator, 50 - 200 g / t of collector, and 20 - 100 g / t of foaming agent are added in sequence, and stirred thoroughly for 5 minutes. The DC power supply is turned on, the current and voltage are adjusted. After uniform and stable bubbles are generated on the anode and cathode electrode meshes, the valve of the discharge port below the stirring tank body and the valve of the feed port 10 of the cathode column 4 are opened. After waiting for the cathode to continuously generate bubbles stably, the power supply of the vertical sand pump is turned on, and the pulp in the stirring tank is gradually transported to the cathode separation column. After the transportation is completed, the power supplies of the stirrer 9 and the heating rod are turned off; when the pulp liquid level gradually rises above the ultrasonic generator 2, the power supply of the ultrasonic generator 2 is turned on and adjusted to a suitable power. A plastic beaker is placed at the concentrate collection port 3 to collect the froth concentrate. After the collection is completed, the product is filtered and dried. After the flotation is over, the DC power supply and the power supply of the ultrasonic generator 2 are turned off, the stirring tank is removed, the tailing pulp and electrolyte in the cathode column 4 are emptied, and it is cleaned for subsequent reuse.

[0058] When collecting the froth concentrate, the overflow port can be rinsed with clean water. On the one hand, it is convenient for collecting the froth concentrate, and on the other hand, it can also manually increase the total amount of liquid in the cathode column 4 to ensure that the froth concentrate can be discharged smoothly.

[0059] Example 1

[0060] A certain cyanidation tailings pile in Inner Mongolia, China. The content of particles with a size of -400 mesh in the ore accounts for more than 85%. The main valuable minerals are native gold and calaverite. Other metal minerals include pyrite, chalcopyrite, galena, sphalerite, limonite, hematite, as well as a small amount of tetrahedrite and stibnite; the main gangue minerals are quartz, as well as a small amount of albite, illite, calcite, etc. The Au in the ore mainly exists in the form of native gold, calaverite, and petzite. More than about 90% of the Au is hosted in pyrite in the form of sulfide-wrapped gold, followed by limonite. The Au grade in the cyanidation tailings is 1.15 g / t.

[0061] Mix and quarter the cyanidation tailings, take 4 portions, each with a mass of 1 kg, numbered A, B, C, and D respectively. Prepare pulp according to the mass ratio of ore to water of 1:2, transfer it to the stirring cylinder, add 100 ml of 10% hydrogen peroxide solution, add concentrated sulfuric acid until the pH of the pulp is adjusted to 6.5, set the temperature to 35 °C, add flotation reagents in sequence, with the dosages being 100 g / t of copper sulfate, 50 g / t of ammonium sulfate, 100 g / t of ethyl dixanthogen, 50 g / t of polyoxybutenyl alcohol dithiophosphate, and 20 g / t of pine oil. The stirring speed is 800 r / min, and the current intensities are 400 mA, 800 mA, 1200 mA, and 1600 mA respectively. The electrolytic microbubble flotation time is 15 min, the power of the ultrasonic generator is 600 W, the electrode mesh is made of stainless steel with a diameter of 4 mm and a thickness of 1 mm. After flotation, perform solid-liquid separation. After drying the froth concentrate, analyze the Au grade in each concentrate respectively and calculate the Au recovery rate. The Au grades in the concentrates of A, B, C, and D are 8.8 g / t, 7.1 g / t, 5.5 g / t, and 5.0 g / t respectively, and the gold recovery rates are 38.59%, 56.35%, 71.39%, and 69.66% respectively.

[0062] Example 2

[0063] A certain cyanidation tailings pile in Inner Mongolia, China. The content of particles with a size of -400 mesh in the ore accounts for more than 85%. The main valuable minerals are native gold and calaverite. Other metal minerals include pyrite, chalcopyrite, galena, sphalerite, limonite, hematite, as well as a small amount of tetrahedrite and stibnite; the main gangue minerals are quartz, as well as a small amount of albite, illite, calcite, etc. The Au in the ore mainly exists in the form of native gold, calaverite, and petzite. More than about 90% of the Au is hosted in pyrite in the form of sulfide-wrapped gold, followed by limonite. The Au grade in the cyanidation tailings is 1.15 g / t.

[0064] The cyanidation tailings were mixed and reduced in sample size. Four samples, each with a mass of 1 kg, were taken and numbered A, B, C, and D. Pulps were prepared according to the mass ratio of ore to water of 1:2 and transferred to the stirring cylinder. 100 ml of 10% hydrogen peroxide solution was added, and concentrated sulfuric acid was added until the pH of the pulp was adjusted to 6.5. The temperature was set at 35 °C. Flotation reagents were added in sequence, with the dosages being 100 g / t of copper sulfate, 50 g / t of ammonium sulfate, 100 g / t of ethyl dixanthogen, 50 g / t of polyoxybutenol dithiophosphate, and 20 g / t of pine oil. The stirring speed was 800 r / min, the current intensity was 1200 mA, the electrolytic microbubble flotation time was 15 min, and the powers of the ultrasonic generators were 600 W, 900 W, 1200 W, and 1500 W respectively. The electrode mesh was made of stainless steel with a diameter of 4 mm and a thickness of 1 mm. After flotation, solid-liquid separation was carried out. After the froth concentrate was dried, the Au grades in each concentrate were analyzed respectively, and the Au recovery rate was calculated. The Au grades in the concentrates of A, B, C, and D were 5.5 g / t, 7.2 g / t, 10.6 g / t, and 9.8 g / t respectively, and the gold recovery rates were 71.39%, 68.35%, 66.66%, and 66.39% respectively.

[0065] Example 3,

[0066] The cyanidation tailings of gold concentrate in Inner Mongolia, China. The content of the -400 mesh particle size fraction in the ore is more than 90%. The main valuable minerals are native gold and calaverite, and other metallic minerals include pyrite and chalcopyrite; the main gangue minerals are quartz, as well as a small amount of albite, calcite, etc. The Au in the ore mainly exists in the form of native gold and calaverite. More than about 95% of the Au is hosted in pyrite in the form of sulfide-wrapped gold, followed by limonite. The Au grade in the cyanidation tailings is 3.55 g / t.

[0067] The cyanidation tailings were mixed and reduced in size, and 4 portions were taken, each with a mass of 1 kg, numbered A, B, C, and D respectively. Pulps were prepared according to the mass ratio of ore to water of 1:2, transferred to the stirring cylinder, 100 ml of 10% hydrogen peroxide solution was added, concentrated sulfuric acid was added until the pulp pH was adjusted to 6.5, the set temperature was 35 °C, and flotation reagents were added in sequence. The dosages were 100 g / t of copper sulfate, 50 g / t of ammonium sulfate, 100 g / t of ethyl dixanthogen, 50 g / t of polyoxybutenol dithiophosphate sodium, and 20 g / t of pine oil. The stirring speed was 800 r / min, the current intensity was 1200 mA, the electrolytic microbubble flotation time was 15 min, the power of the ultrasonic generator was 600 W, and the stainless steel meshes with electrode mesh diameters of 4 mm, 1 mm, 0.2 mm, and 0.1 mm and a thickness of 1 mm were used. After flotation, solid-liquid separation was carried out. After the froth concentrate was dried, the Au grades in each concentrate were analyzed respectively, and the Au recovery rate was calculated. The Au grades in the concentrates of A, B, C, and D were 17.3 g / t, 15.5 g / t, 12.6 g / t, and 10.7 g / t respectively, and the gold recovery rates were 72.66%, 80.35%, 78.57%, and 75.42% respectively.

[0068] Example 4,

[0069] The cyanidation tailings of gold concentrate in Inner Mongolia, China. The content of -400 mesh particle size in the ore accounts for more than 90%. The main valuable minerals are native gold and calaverite, and other metal minerals include pyrite and chalcopyrite; the main gangue minerals are quartz, as well as a small amount of albite, calcite, etc. The Au in the ore mainly exists in the form of native gold and calaverite. More than about 95% of the Au is hosted in pyrite in the form of sulfide-wrapped gold, followed by limonite. The Au grade in the cyanidation tailings is 3.55 g / t.

[0070] The cyanidation tailings were mixed and reduced in size, and 4 portions were taken, each with a mass of 1 kg, numbered A, B, C, and D respectively. Pulps were prepared according to the mass ratio of ore to water of 1:2, transferred to the stirring cylinder, 100 ml of 10% hydrogen peroxide solution was added, concentrated sulfuric acid was added until the pulp pH was adjusted to 6.5, the set temperature was 35 °C, and flotation reagents were added in sequence. The dosages of the activator were 100 g / t of copper sulfate and 50 g / t of ammonium sulfate. The dosages of the collector ethyl bisxanthate were 75, 100, 125, and 150 g / t respectively, the dosages of polyoxybutenol dithiophosphate sodium were 25, 50, 75, and 100 g / t respectively, and 20 g / t of pine oil was added. The stirring speed was 800 r / min, the current intensity was 1200 mA, the electrolytic microbubble flotation time was 15 min, the power of the ultrasonic generator was 600 W, the electrode mesh was a stainless steel mesh with a diameter of 4 mm and a thickness of 1 mm. After flotation, solid-liquid separation was carried out. After the froth concentrate was dried, the grades of Au in each concentrate were analyzed respectively, and the recovery rate of Au was calculated. The grades of Au in the concentrates of A, B, C, and D were 23.4 g / t, 18.8 g / t, 17.3 g / t, and 11.3 g / t respectively, and the gold recovery rates were 52.79%, 71.35%, 72.66%, and 85.42% respectively.

[0071] Adaptations made according to actual requirements are all within the protection scope of the present invention.

[0072] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A method based on micro-nano bubble flotation, characterized in that: The following steps are involved: Step S1: introducing air bubbles into the bottom of the slurry to be processed; Step S2: ultrasonically treating the slurry below the liquid level of the slurry to be treated; Step S3: Collecting foam concentrate produced by the combination of bubbles and minerals above the slurry to be processed.

2. The method based on micro-nano bubble flotation according to claim 1, characterized in that: Before step S1, the process also includes the following steps: The pH value, temperature value and concentration value of the original slurry are adjusted to obtain the slurry to be treated.

3. The method based on micro-nano bubble flotation according to claim 1, characterized in that: In step S1: bubbles are provided to the slurry to be processed by electrolysis.

4. The method based on micro-nano bubble flotation according to claim 3, characterized in that: Step S1 includes: Step S11: introducing air bubbles into the bottom of the flotation chamber which is not loaded with the slurry to be processed; Step S12: After the bubbles can be supplied continuously and stably, the slurry to be processed is added into the flotation chamber.

5. The method based on micro-nano bubble flotation according to claim 4, characterized in that: In step S2, when the liquid level is higher than the ultrasonic generator for ultrasonically treating the slurry to be treated, the ultrasonic generator is turned on.

6. A flotation device, characterized in that: include: A flotation chamber, a bubble generator and an ultrasonic generator are extended in the up-down direction, the bottom of the flotation chamber is connected with the bubble generator, the concentrate collecting port of the flotation chamber is arranged at the upper part of the flotation chamber, the ultrasonic generator is installed on the side wall of the flotation chamber, and the ultrasonic generator is located between the bubble generator and the concentrate collecting port.

7. The flotation device according to claim 6, characterized in that: The bubble generator is an electrolytic generator, which includes a cathode column and an anode column connected to electrodes, an ion exchange channel is arranged between the cathode column and the anode column, a proton exchange membrane is arranged on the ion exchange channel, and the upper opening of the cathode column is connected to the bottom of the flotation chamber.

8. The flotation device according to claim 7, characterized in that: The cathode column is provided with a discharge port at the bottom, and the electrode is arranged above the discharge port.

9. The flotation device according to claim 6, characterized in that: It also includes a pretreatment chamber, in which a stirrer for stirring the original ore pulp is arranged, and the pretreatment chamber is connected with the feed port of the flotation chamber.

10. The flotation device according to claim 9, characterized in that The pretreatment chamber is also provided with a temperature measuring device for measuring the temperature of the original ore pulp and a heating device for heating the original ore pulp.

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