A process and device for recovering coarse molybdenum ore particles from molybdenum flotation tailings

Abstract

The invention discloses a recovery process and device for coarse molybdenum ore particles in molybdenum flotation tailings, which belongs to the field of mineral processing technology, and solves the problem of "coarseness" in molybdenum ore flotation and the inability to effectively recover some coarse molybdenum ore resources into concentrates in the prior art, resulting in waste of molybdenum ore resources. The recovery process comprises the following steps: hydraulically classifying the flotation tailings of the original ore to obtain coarse molybdenite tailings above the classification particle size and fine molybdenite tailings below the classification particle size; hydraulically flotating the coarse molybdenite tailings to obtain hydraulic flotation tailings and hydraulic flotation concentrates; mixing the hydraulic flotation concentrate with the original molybdenite ore as the molybdenite to be floated in step 1, and repeating steps 1 to 2. The device and the recovery process can be used for the recovery of coarse molybdenum ore particles in molybdenum flotation tailings.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a process and a device for recovering coarse molybdenum ore particles in molybdenum flotation tailings. Background Art

[0002] Molybdenite resources are a kind of mineral resources with strategic advantages in my country. In industry, flotation method is usually used for recovery. The common recovery process of molybdenum ore is to crush the ore into full-size particles and grind it to the target size, and then flotate and separate the original ore.

[0003] Since some molybdenite has a coarse degree of dissociation, and the upper limit of the effective recovery particle size of traditional flotation is about 150μm, some coarse-grained molybdenum ore resources cannot be effectively recovered into concentrate. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide a process and device for recovering coarse molybdenum ore particles in molybdenum flotation tailings, which solves the problem in the prior art that molybdenum ore flotation "runs coarsely" and some coarse molybdenum ore resources cannot be effectively recovered into concentrate, resulting in waste of molybdenum ore resources.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] The present invention provides a process for recovering coarse molybdenum ore particles in molybdenum flotation tailings, comprising the following steps:

[0007] Step 1: The molybdenite to be floated after the grinding process and the raw ore flotation is divided into raw ore flotation concentrate and raw ore flotation tailings;

[0008] The flotation tailings of the original ore are hydraulically classified to obtain coarse molybdenum tailings above the classification particle size and fine molybdenum tailings below the classification particle size;

[0009] Step 2: hydraulically flotate the coarse molybdenum tailings to obtain hydraulic flotation tailings and hydraulic flotation concentrates;

[0010] Step 3: Mix the hydraulic flotation concentrate with the molybdenite ore as the molybdenum ore to be floated in step 1, and repeat steps 1 to 2.

[0011] Further, in step 1, the raw ore flotation comprises the following steps:

[0012] The molybdenite to be floated after grinding is subjected to roughing, scavenging and concentrating in sequence.

[0013] Furthermore, the following steps are included between step 1 and step 2:

[0014] The crude molybdenum sulphate tailings are slurried.

[0015] Furthermore, slurry preparation includes the following steps:

[0016] 80-120 g / t of kerosene is added to the ore pulp as a collector to obtain an ore pulp with a mass concentration of 30-40%.

[0017] Furthermore, in step 2, the classification particle size is 150 μm.

[0018] Further, it is characterized in that, in step 2, hydraulic flotation uses a hydraulic flotation machine;

[0019] The hydraulic flotation machine includes a flotation column, a water supply unit, a water distribution unit and a bubble generator; the water inlet of the water distribution unit is connected to the water supply unit, and the water outlet of the water distribution unit is located at the bottom of the flotation column; the bubble generator is arranged on the connecting pipeline between the water inlet of the water distribution unit and the water supply unit.

[0020] Further, the bubble generator is located outside the flotation column.

[0021] Furthermore, the bubble generator includes an air supply unit, a pulse solenoid valve, an air chamber and a microporous plate. The air supply unit, the pulse solenoid valve and the air chamber are connected in sequence, and the microporous plate is arranged between the air chamber and the water inlet of the water distribution unit and the connecting pipeline of the water supply unit.

[0022] Furthermore, the bubble generator also includes a diverter tee, which has an air intake branch, an exhaust branch and an air supply branch that are interconnected. The air outlet of the pulse solenoid valve is connected to the air intake branch, the exhaust branch is connected to the external environment, and the air supply branch is connected to the air chamber.

[0023] The present invention also provides a device for recovering coarse molybdenum ore particles in molybdenum flotation tailings, which is used in the above-mentioned process for recovering coarse molybdenum ore particles in molybdenum flotation tailings. The recovery device comprises a hydraulic classifier and a hydraulic flotation machine which are connected in sequence.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] A) The process for recovering coarse molybdenum ore particles in molybdenum flotation tailings provided by the present invention can effectively recover valuable coarse molybdenum-containing particles (i.e., hydraulic flotation concentrate) in the flotation tailings of the original ore by reprocessing the flotation tailings of the original ore, and return the valuable coarse molybdenum-containing particles to the grinding process again, and can effectively recover the coarse molybdenum ore lost in the ore flow of the flotation tailings of the original ore, thereby increasing the total recovery rate of molybdenum. The process has the characteristics of high molybdenum recovery rate, low environmental pollution, high economic benefit, simple process, etc.

[0026] B) The process for recovering coarse molybdenum ore particles in molybdenum flotation tailings provided by the present invention, on the one hand, hydraulic flotation usually has good sorting efficiency in the particle size range of 150 to 1000 μm, and by classifying the preliminary flotation tailings in step 2, the preliminary flotation tailings are divided into coarse molybdenite tailings with a particle size of more than 150 μm and fine molybdenite tailings with a particle size of less than 150 μm, which is convenient for subsequent hydraulic flotation of the coarse molybdenite tailings; on the other hand, it can be known from tests that the coarse molybdenum tailings with a particle size of more than 150 μm contain a relatively high molybdenum content, and by re-hydraulic flotation of this part of the tailings, the total recovery rate of molybdenum can be effectively improved.

[0027] C) In the process for recovering coarse molybdenum ore particles in molybdenum flotation tailings provided by the present invention, the bubble generator and the water distribution unit are two relatively independently arranged components. The bubble generator is arranged on the connecting pipeline between the water inlet of the water distribution unit and the water supply unit, and is located outside the flotation column. The bubble size can be independently adjusted by the bubble generator, and the rising water flow rate can be independently controlled by the water supply unit and the water distribution unit, thereby greatly improving the adaptability of mineral separation.

[0028] D) The process for recovering coarse molybdenum ore particles in molybdenum flotation tailings provided by the present invention, on the one hand, a pulse electromagnetic valve is provided in the above-mentioned bubble generator, and the steady-state airflow provided by the air supply unit can be converted into a pulse airflow by controlling the frequency of the pulse electromagnetic valve and the switching time within a cycle. In this way, converting the steady-state continuous airflow into a pulse airflow can effectively increase the dynamic pressure of the airflow, drive the bubbles to desorb in advance and reduce the longitudinal merger after desorption, and effectively increase the instantaneous dynamic pressure of the gas on the basis of unchanged air supply volume, thereby generating more fine bubbles; on the other hand, a diversion tee is provided in the above-mentioned bubble generator, and by adjusting the diversion ratio, under the premise of not increasing the flow rate of the airflow entering the air supply branch, the total air flow of the air supply unit is increased and part of the gas is emptied, thereby increasing the static pressure of the gas entering the microporous plate, further driving the bubbles to desorb in advance and reducing the bubble formation scale by adjusting the diversion ratio, without increasing the flow rate of the airflow entering the air supply branch, and further driving the bubbles to desorb in advance and reducing the bubble formation scale; it should be noted that according to the principle of Bernoulli's equation, the total mechanical energy of any two points on the streamline in fluid flow is conserved, the mechanical energy of the airflow in the air supply branch increases due to the increase in the airflow velocity, and the gas energy entering the air supply branch increases due to the unchanged momentum and the static pressure.

[0029] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0031] Figure 1 The present invention provides a flow chart of a process for recovering coarse molybdenum ore particles in molybdenum flotation tailings.

[0032] Figure 2 The invention provides a hydraulic flotation machine in a device for recovering coarse molybdenum ore particles in molybdenum flotation tailings.

[0033] Reference numerals:

[0034] 1-feed pump; 2-slurry flowmeter; 3-overflow tank; 4-pressure sensor; 5-water distribution unit; 6-flotation column; 7-pulse solenoid valve; 8-water supply unit; 9-microporous plate; 10-air chamber; 11-pressure sensor controller; 12-tail solenoid valve; 13-air supply unit; 14-pressure regulator; 15-gas flowmeter; 16-diversion tee. DETAILED DESCRIPTION

[0035] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0036] The present invention also provides a process for recovering coarse molybdenum ore particles in molybdenum flotation tailings, see Figure 1 , including the following steps:

[0037] Step 1: After the flotation molybdenite has been subjected to a grinding process and the mass percentage of particles with a particle size of less than 200 meshes reaches more than 65%, the raw ore is flotated to obtain raw ore flotation concentrate and raw ore flotation tailings; the raw ore flotation tailings are hydraulically classified to obtain coarse molybdenum tailings above the classification particle size and fine molybdenum tailings below the classification particle size;

[0038] Step 2: hydraulically flotate the coarse molybdenum tailings to obtain hydraulic flotation tailings and hydraulic flotation concentrates;

[0039] Step 3: Mix the hydraulic flotation concentrate with the molybdenite ore as the molybdenum ore to be floated in step 1, and repeat steps 1 to 2 to complete the recovery of coarse molybdenum ore particles.

[0040] Compared with the prior art, the process for recovering coarse molybdenum ore particles in molybdenum flotation tailings provided by the present invention can effectively recover valuable coarse molybdenum-containing particles (i.e., hydraulic flotation concentrate) in the flotation tailings of the original ore by reprocessing the flotation tailings of the original ore, and sequentially performing hydraulic classification and hydraulic flotation, and return the valuable coarse molybdenum-containing particles to the grinding process again, and can effectively recover the coarse molybdenum ore lost in the ore flow of the flotation tailings of the original ore, thereby increasing the total recovery rate of molybdenum, and has the characteristics of high molybdenum recovery rate, low environmental pollution, high economic benefit, simple process, etc.

[0041] Exemplarily, in the above step 1, the raw ore flotation comprises the following steps:

[0042] The molybdenite to be floated after grinding is subjected to roughing, scavenging and concentrating in sequence.

[0043] In order to improve the hydraulic flotation effect of the coarse molybdenum tailings, the following steps are also included between step 1 and step 2:

[0044] The crude molybdenite tailings are slurried to obtain a slurry with a mass concentration of 30-40%, and 80-120 g / t of kerosene is added to the slurry as a collector.

[0045] In order to further improve the total recovery rate of molybdenum, in the above step 2, the classification particle size is 150μm. This is because, on the one hand, hydraulic flotation usually has a good sorting efficiency in the particle size range of 150 to 1000μm. By classifying the preliminary flotation tailings in step 2, the preliminary flotation tailings are divided into coarse molybdenite tailings with a particle size of more than 150μm and fine molybdenite tailings with a particle size of less than 150μm, which is convenient for subsequent hydraulic flotation of the coarse molybdenite tailings; on the other hand, it can be known from tests that the coarse molybdenum tailings with a particle size of more than 150μm contain a large amount of molybdenum. By re-hydraulic flotation of this part of the tailings, the total recovery rate of molybdenum can be effectively improved.

[0046] The present invention also provides a device for recovering coarse molybdenum ore particles in molybdenum flotation tailings, which is used in the above-mentioned process for recovering coarse molybdenum ore particles in molybdenum flotation tailings. The recovery device comprises a hydraulic classifier and a hydraulic flotation machine which are connected in sequence.

[0047] Compared with the prior art, the beneficial effects of the device for recovering coarse molybdenum ore particles in molybdenum flotation tailings provided by the present invention are basically the same as the beneficial effects of the process for recovering coarse molybdenum ore particles in molybdenum flotation tailings provided above, and are not elaborated here.

[0048] It should be noted that in order to effectively improve the flotation effect of hydraulic flotation, see Figure 2 The hydraulic flotation machine includes a flotation column 6, a water supply unit 8 (for example, a water pump), a water distribution unit 5 and a bubble generator; wherein the water inlet of the water distribution unit 5 is connected to the water supply unit 8, and the water outlet of the water distribution unit 5 is located at the bottom of the flotation column 6, for forming an ascending water flow in the flotation column 6; the bubble generator is arranged on the connecting pipeline between the water inlet of the water distribution unit 5 and the water supply unit 8, and the bubble generator is located outside the flotation column 6.

[0049] Hydraulic flotation is an emerging coarse particle sorting technology with good sorting efficiency in the particle size range of 150-1000μm. It can form a technical complement with traditional flotation methods in terms of sorting particle size. The sorting effect of hydraulic flotation is mainly affected by the rising water flow velocity and the bubble size. The common hydraulic flotation machine's foaming method is mainly achieved through hydraulic cavitation. The bubble size depends on the cavitation intensity, that is, the rising water flow velocity. Therefore, it is impossible to achieve independent regulation of the rising water flow velocity and the bubble size, and the mineral sorting adaptability is poor.

[0050] In the present invention, the bubble generator and the water distribution unit 5 are two relatively independently arranged components. The bubble generator is arranged on the connecting pipeline between the water inlet of the water distribution unit 5 and the water supply unit 8, and is located outside the flotation column 6. The bubble size can be independently adjusted by the bubble generator, and the rising water flow rate can be independently controlled by the water supply unit 8 and the water distribution unit 5, thereby greatly improving the adaptability of mineral separation.

[0051] In order to reduce the bubble size and improve the hydraulic flotation effect, the above-mentioned bubble generator includes an air supply unit 13 (for example, an air compressor), a pulse solenoid valve 7 (for example, a high-frequency solenoid valve), a diverter tee 16, an air chamber 10 and a microporous plate 9. The diverter tee 16 has an air intake branch, an exhaust branch and an air supply branch that are interconnected. The air outlet of the air supply unit 13 is connected to the air intake branch through the pulse solenoid valve 7, the exhaust branch is connected to the external environment, and the air supply branch is connected to the air chamber 10. The microporous plate 9 is arranged between the air chamber 10 and the connecting pipeline (that is, the water inlet of the water distribution unit 5 and the connecting pipeline of the water supply unit 8). The gas (for example, air) provided by the air supply unit 13 enters the connecting pipeline through the air intake branch, the air supply branch, the air chamber 10 and the microporous plate 9 in sequence to form microbubbles. This is because the pressure of the gas when passing through the microporous plate 9 will significantly affect the bubble diameter. Increasing the gas pressure passing through the hole is an effective way to reduce the bubble diameter. The gas pressure includes dynamic pressure and static pressure. The bubble generator of this structure forms bubbles through pulse-diverter micropores, which has the function of simultaneously increasing the dynamic pressure and static pressure of the airflow. On the one hand, the bubble generator is provided with a pulse solenoid valve 7. By controlling the frequency of the pulse solenoid valve 7 and the switching time within a cycle, the steady-state airflow provided by the air supply unit 13 can be converted into a pulse airflow. In this way, converting the steady-state continuous airflow into a pulse airflow can effectively increase the dynamic pressure of the airflow, drive the bubbles to desorb in advance and reduce the longitudinal merger after desorption. On the basis of unchanged air supply volume, the instantaneous dynamic pressure of the gas is effectively increased, thereby generating finer bubbles. On the other hand, the bubble generator is provided with a diversion tee 16. By adjusting the diversion ratio, without increasing the flow rate of the airflow entering the air supply branch, the total air flow rate of the air supply unit 13 is increased and part of the gas is emptied, thereby increasing the static pressure of the gas entering the microporous plate 9, further driving the bubbles to desorb in advance and reducing the scale of bubble formation. It should be noted that according to the principle of Bernoulli's equation, the total mechanical energy of any two points on the streamline in fluid flow is conserved, the mechanical energy of the airflow in the air supply branch increases due to the increase in airflow velocity, and the energy of the gas entering the air supply branch increases due to the unchanged momentum and the static pressure.

[0052] Exemplarily, the flow ratio (ie, the flow split ratio) between the exhaust branch and the gas supply branch is 1-10.

[0053] In order to adjust the gas supply pressure of the gas supply unit 13 , a pressure regulator 14 is provided on the connecting pipeline between the gas outlet of the gas supply unit 13 and the pulse solenoid valve 7 , and the gas supply pressure of the gas supply unit 13 can be adjusted by the pressure regulator 14 .

[0054] In order to enable the operator to understand the diversion ratio and the gas flow value in the air intake branch and / or the exhaust branch in real time, a gas flow meter 15 is provided on the connecting pipeline between the air outlet of the above-mentioned air supply unit 13 and the pulse solenoid valve 7 and / or the connecting pipeline between the diversion tee 16 and the external environment. The gas flow meter 15 can obtain the gas flow on the air supply branch and / or the exhaust branch in real time.

[0055] Experiments have shown that in the bubble generator of the present invention, no buffer tank is provided on the connecting pipelines between the air supply unit 13 and the diverter tee 16 and between the diverter tee 16 and the external environment. This is because test data show that providing a buffer tank on the connecting pipelines at these two locations will instead cause unstable air supply.

[0056] In practical applications, in order to be able to measure the height of the fluidized bed in the flotation column 6, which is very important for safe production, the above-mentioned hydraulic flotation machine also includes a pressure sensor 4 arranged in the fluidized bed of the flotation column 6, which can effectively reflect the height of the fluidized bed in the flotation column 6 through pressure testing.

[0057] Considering that once the height of the fluidized bed exceeds the threshold, it is necessary to discharge the ore in time, the above-mentioned hydraulic flotation machine also includes a tail discharge solenoid valve 12 and a pressure sensor controller 11. The pressure sensor controller 11 is respectively connected to the pressure sensor 4 and the tail discharge solenoid valve 12. The pressure sensor controller 11 receives the pressure in the fluidized bed collected by the pressure sensor 4, and determines whether the pressure in the fluidized bed exceeds the threshold. If it exceeds the threshold, the tail discharge solenoid valve 12 is controlled to open, and the flotation column 6 is discharged.

[0058] It is understandable that, in order to realize the feeding of the flotation column 6 , the hydraulic flotation machine further includes an overflow tank 3 arranged at the top of the flotation column 6 and a feed pump 1 connected to the feed port of the flotation column 6 .

[0059] In order to be able to understand the feed slurry flow rate in real time, the hydraulic flotation machine further comprises a slurry flow meter 2 provided on the connecting pipeline between the feed pump 1 and the flotation column 6, and the feed slurry flow meter 2 is used to monitor the feed slurry flow rate in real time.

[0060] Embodiment 1

[0061] This embodiment is mainly aimed at the flotation tailings of the raw ore obtained after the flotation of a molybdenum mine in western Henan Province, and its recovery method includes the following steps:

[0062] Step a: grinding the molybdenite to be floated to -200 meshes accounting for about 65% by using a ball mill, and then performing roughing, scavenging and concentrating in sequence to obtain the original ore flotation concentrate and the original ore flotation tailings;

[0063] Step b: hydraulically classifying the flotation tailings of the raw ore to obtain coarse molybdenum tailings with a particle size of more than 150 μm and fine molybdenum tailings with a particle size of less than 150 μm;

[0064] Step c: Put the crude molybdenum tailings into a stirring barrel for slurry adjustment to form a slurry with a mass concentration of 30%, and add 80g / t of kerosene as a collector;

[0065] Step d: Adding the foaming agent No. 2 oil into the water supply unit and adjusting the concentration to 20 ppm;

[0066] Step e: After the hydraulic flotation machine is stable, hydraulic separation is started to recover coarse molybdenite to obtain hydraulic flotation tailings and hydraulic flotation concentrate, wherein the water supply flow rate of the water supply unit is 8L / min, the total air supply flow rate of the air supply unit is 10L / min, the split ratio is 4, and the slurry flow rate is 2L / min.

[0067] Step f: Mix the hydraulic flotation concentrate with the molybdenite ore to obtain the molybdenum ore to be floated in step a, and repeat steps a to e to complete the recovery of coarse molybdenum ore particles.

[0068] Table 1 Hydraulic flotation separation index of this embodiment

[0069]

[0070]

[0071] It can be seen from Table 1 that the grade of coarse molybdenum tailings with a particle size of more than 150 μm is reduced to 0.0043% after hydraulic flotation, and the recovery rate of hydraulic flotation is 84.49%, which proves that the recovery process of this embodiment can effectively recover molybdenum in the flotation tailings of the original ore.

[0072] Embodiment 2

[0073] This embodiment is mainly aimed at the flotation tailings of the raw ore obtained after the flotation of a molybdenum mine in western Henan Province, and its recovery method includes the following steps:

[0074] Step a: grinding the molybdenite to be floated to -200 meshes accounting for about 65% by using a ball mill, and then performing roughing, scavenging and concentrating in sequence to obtain the original ore flotation concentrate and the original ore flotation tailings;

[0075] Step b: hydraulically classifying the flotation tailings of the raw ore to obtain coarse molybdenum tailings with a particle size of more than 150 μm and fine molybdenum tailings with a particle size of less than 150 μm;

[0076] Step c: placing the crude molybdenum tailings into a stirring barrel for slurry adjustment to form a slurry with a mass concentration of 38%, and adding 100 g / t of kerosene as a collector;

[0077] Step d: Adding the foaming agent No. 2 oil into the water supply unit and adjusting the concentration to 25 ppm;

[0078] Step e: After the hydraulic flotation machine is stable, hydraulic separation is started to recover coarse molybdenite to obtain hydraulic flotation tailings and hydraulic flotation concentrate, wherein the water supply flow rate of the water supply unit is 10L / min, the total air supply flow rate of the air supply unit is 15L / min, the split ratio is 6, and the slurry flow rate is 3.5L / min.

[0079] Step f: Mix the hydraulic flotation concentrate with the molybdenite ore to obtain the molybdenum ore to be floated in step a, and repeat steps a to e to complete the recovery of coarse molybdenum ore particles.

[0080] Table 2 Hydraulic flotation separation index of this embodiment

[0081]

[0082]

[0083] It can be seen from Table 2 that the grade of coarse molybdenum tailings with a particle size of more than 150 μm is reduced to 0.0035% after hydraulic flotation, and the recovery rate of hydraulic flotation is 87.90%, which proves that the recovery process of this embodiment can effectively recover molybdenum in the flotation tailings of the original ore.

[0084] Embodiment 3

[0085] This embodiment is mainly aimed at the raw ore flotation tailings obtained after the raw ore flotation of a molybdenum mine in western Henan Province. The recovery method is basically the same as the recovery method of the second embodiment, except that no diversion is performed during the hydraulic flotation process. The recovery method of this embodiment includes the following steps:

[0086] Step a: grinding the molybdenite to be floated to -200 meshes accounting for about 65% by using a ball mill, and then performing roughing, scavenging and concentrating in sequence to obtain the original ore flotation concentrate and the original ore flotation tailings;

[0087] Step b: hydraulically classifying the flotation tailings of the raw ore to obtain coarse molybdenum tailings with a particle size of more than 150 μm and fine molybdenum tailings with a particle size of less than 150 μm;

[0088] Step c: placing the crude molybdenum tailings into a stirring barrel for slurry adjustment to form a slurry with a mass concentration of 38%, and adding 100 g / t of kerosene as a collector;

[0089] Step d: Adding the foaming agent No. 2 oil into the water supply unit and adjusting the concentration to 25 ppm;

[0090] Step e: After the hydraulic flotation machine is stable, hydraulic separation is started to recover coarse molybdenite to obtain hydraulic flotation tailings and hydraulic flotation concentrate, wherein the water supply flow rate of the water supply unit is 10L / min, the total air supply flow rate of the air supply unit is 15L / min, the split ratio is 6, and the slurry flow rate is 3.5L / min.

[0091] Step f: Mix the hydraulic flotation concentrate with the molybdenite ore to obtain the molybdenum ore to be floated in step a, and repeat steps a to e to complete the recovery of coarse molybdenum ore particles.

[0092] Table 3 Hydraulic flotation separation index of this embodiment

[0093]

[0094]

[0095] It can be seen from Table 3 that the grade of coarse molybdenum tailings with a particle size of more than 150 μm is reduced to 0.0085% after hydraulic flotation, and the recovery rate of hydraulic flotation is 73.70%.

[0096] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A process for recovering coarse molybdenum ore particles from molybdenum flotation tailings, characterized in that: The steps include: Step 1: The molybdenite to be floated after the grinding process and the raw ore flotation is divided into raw ore flotation concentrate and raw ore flotation tailings; The flotation tailings of the original ore are hydraulically classified to obtain coarse molybdenum tailings above the classification particle size and fine molybdenum tailings below the classification particle size; Step 2: hydraulically flotate the coarse molybdenum tailings to obtain hydraulic flotation tailings and hydraulic flotation concentrates; Step 3: Mix the hydraulic flotation concentrate with the molybdenite ore as the molybdenum ore to be floated in step 1, and repeat steps 1 to 2.

2. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to claim 1, characterized in that: In step 1, the raw ore flotation comprises the following steps: The molybdenite to be floated after grinding is subjected to roughing, scavenging and concentrating in sequence.

3. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to claim 1, characterized in that: The following steps are also included between step 1 and step 2: The coarse molybdenum tailings are slurried.

4. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to claim 3, characterized in that: The slurry preparation comprises the following steps: 80-120 g / t of kerosene is added to the ore pulp as a collector to obtain an ore pulp with a mass concentration of 30-40%.

5. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to claim 1, characterized in that: In the step 2, the classified particle size is 150 μm.

6. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to any one of claims 1 to 5, characterized in that: In the step 2, the hydraulic flotation is performed using a hydraulic flotation machine; The hydraulic flotation machine comprises a flotation column, a water supply unit, a water distribution unit and a bubble generator; the water inlet of the water distribution unit is connected to the water supply unit, and the water outlet of the water distribution unit is located at the bottom of the flotation column; the bubble generator is arranged on the connecting pipeline between the water inlet of the water distribution unit and the water supply unit.

7. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to claim 6, characterized in that: The bubble generator is located outside the flotation column.

8. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to claim 6, characterized in that: The bubble generator includes an air supply unit, a pulse solenoid valve, an air chamber and a microporous plate. The air supply unit, the pulse solenoid valve and the air chamber are connected in sequence. The microporous plate is arranged between the air chamber and the water inlet of the water distribution unit and the connecting pipeline of the water supply unit.

9. The process for recovering coarse molybdenum ore particles from molybdenum flotation tailings according to claim 8, characterized in that: The bubble generator also includes a diverter tee, which has an air intake branch, an exhaust branch and an air supply branch that are interconnected. The air outlet of the pulse solenoid valve is connected to the air intake branch, the exhaust branch is connected to the external environment, and the air supply branch is connected to the air chamber.

10. A device for recovering coarse molybdenum ore particles in molybdenum flotation tailings, characterized in that: A process for recovering coarse molybdenum ore particles in molybdenum flotation tailings as described in any one of claims 1 to 9, wherein the recovery device comprises a hydraulic classifier and a hydraulic flotation machine connected in sequence.

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