A method for optimizing the flotation of copper-molybdenum bulk concentrates

Abstract

The application belongs to the technical field of mineral processing, and particularly relates to a method for optimizing copper-molybdenum mixed concentrate flotation, which comprises the following steps: S1: drying; S2: grinding; S3: electroseparation pretreatment; S4: flotation machine flotation; S5: flotation scavenging; and S6: quasi-asynchronous flotation. The copper-molybdenum mixed concentrate is subjected to desmearing and impurity removal through the three pretreatments of drying, grinding and electroseparation. The effect of flotation reagents on minerals is significantly improved due to the desmearing treatment, which is conducive to the inhibition of chalcopyrite in the copper-molybdenum mixed concentrate. In addition, the grade of the selected ore is improved through quasi-asynchronous flotation, which is conducive to flotation. Since the scavenging concentrate contains reagents, the use of flotation reagents can be appropriately reduced, the cost is saved, the environment is friendly, the recovery rate of molybdenite is significantly improved, and the method has the potential for popularization and application.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically a method for optimizing the flotation of copper-molybdenum mixed concentrate. Background Technology

[0002] Copper and molybdenum are often found together in porphyry copper-molybdenum deposits. Currently, the enrichment of copper and molybdenum concentrates is mainly achieved through a mixed flotation and separation process. The main challenge lies in the copper-molybdenum separation stage. The pretreatment process after mixed flotation is difficult to completely remove the flotation reagents remaining on the surface of chalcopyrite, which further narrows the difference in floatability between chalcopyrite and molybdenite during the copper-molybdenum separation stage. This leads to problems such as large reagent dosage or difficulty in inhibition. Therefore, current research on copper-molybdenum separation focuses on the development of new and efficient inhibitors and the optimization of pretreatment processes.

[0003] After copper-molybdenum mixed flotation, common pretreatment methods are mainly divided into physical and chemical methods. Physical methods mainly involve dewatering the mixed concentrate, readjusting the pulp, heating, filtering, low-temperature roasting or activated carbon adsorption, and regrinding, etc., to remove reagents. Chemical methods involve adding various oxidants such as chlorine, hydrogen peroxide, and sodium sulfide to oxidize and decompose the reagents on the surface of the copper-molybdenum mixed concentrate. In essence, the above pretreatment mainly aims to remove the reagents remaining on the surface of the minerals during the mixing stage through physical or chemical means, without using separation or other means to separate the minerals during the mixing stage.

[0004] Therefore, this invention proposes a method for optimizing the flotation of copper-molybdenum mixed concentrate. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art and solve the technical problems existing in the background art, the present invention proposes an optimized method for flotation of copper-molybdenum mixed concentrate.

[0006] This invention is achieved through the following technical solution: a method for optimizing the flotation of copper-molybdenum mixed concentrate, the method comprising the following steps:

[0007] S1: Weigh a certain volume of copper-molybdenum mixed concentrate and put it into a dryer for drying.

[0008] S2: The dried copper-molybdenum mixed concentrate is fed into a grinding mill for grinding until it reaches a medium particle size;

[0009] S3: The copper-molybdenum mixed concentrate ground to medium particle size is fed into an electrostatic separator for electrostatic pretreatment to obtain electrostatic concentrate, electrostatic ore, and electrostatic tailings. The electrostatic ore and electrostatic tailings are then combined as the final electrostatic tailings.

[0010] S4: Add flotation agent to the electrostatic concentrate in S3 to obtain the final flotation concentrate and primary flotation tailings;

[0011] S5: Mix the final electrostatic tailings from S3 with the primary flotation tailings from S4, and feed them into a scavenging flotation machine for flotation and scavenging to obtain scavenging concentrate and final flotation tailings.

[0012] S6: The scavenged concentrate obtained in S5 is fed back into S4, and it is floated again together with the electrostatic concentrate obtained in S3. By performing a kind of asynchronous flotation, the flotation products are only the final flotation concentrate and the final flotation tailings.

[0013] Preferably, the voltage of the electric separator is 23.12KV and the rotation speed is 117.75r / min.

[0014] Preferably, the electrostatic separator is equipped with a concentrate baffle, the angle of which is 4.18°.

[0015] Preferably, the particle size is 24-30 μm.

[0016] Preferably, the flotation agent in S4 includes a depressant, a collector, and a frother; the depressant includes sodium sulfide or sodium carboxymethyl trithiocarbonate; the collector is kerosene or butyl xanthate; and the frother includes No. 2 oil or methyl isobutyl methanol.

[0017] Preferably, the amount of sodium sulfide used is 0-10000 mg / L, the amount of kerosene used is 0-200 mg / L, and the amount of No. 2 oil used is 0-50 mg / L.

[0018] Preferably, the amount of sodium carboxymethyl trithiocarbonate is 0-10000 mg / L, the amount of butyl xanthate is 0-150 mg / L, and the amount of methyl isobutyl methanol is 0-20 mg / L.

[0019] Preferably, in step S4, the specific steps for adding flotation agent to the electrostatic concentrate in step S3 are as follows:

[0020] P1: Add inhibitor to the electrostatic concentrate and allow it to act for 5 minutes;

[0021] P2: Based on P1, add a collector to it and let it act for 3 minutes;

[0022] P3: Based on P2, add foaming agent, let it act for 30 seconds, then turn on the inflation device switch to inflate to 0.05m. 3 Gas is injected at a rate of / h, and after 30s of aeration, bubbles are scraped off and flotation is performed.

[0023] The beneficial effects of this invention are:

[0024] This invention employs three pretreatment processes—drying, grinding, and electrostatic separation—to de-drug and remove impurities from copper-molybdenum mixed concentrate. The interaction between flotation reagents and minerals is significantly enhanced by the de-drug treatment, which is beneficial for suppressing chalcopyrite in the copper-molybdenum mixed concentrate. In addition, the grade of the feed ore is improved through a quasi-asynchronous flotation process, which is beneficial for flotation. Furthermore, since the scavenged concentrate contains reagents, the amount of flotation reagents can be appropriately reduced, saving costs and being environmentally friendly. It also significantly improves the recovery rate of molybdenite, demonstrating potential for widespread application. Attached Figure Description

[0025] Figure 1 This is a process flow diagram of the present invention;

[0026] Figure 2 This is an XRD analysis diagram of the copper-molybdenum mixed concentrate after electrostatic separation in this invention;

[0027] Figure 3 This is the XRD analysis diagram of the copper-molybdenum mixed concentrate before electrostatic separation in this invention; Detailed Implementation

[0028] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods in the art or as per the product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention. The invention will now be further described with reference to the accompanying drawings and specific embodiments. The preferred embodiments and materials described herein are for illustrative purposes only.

[0030] like Figure 1-3 As shown:

[0031] Example 1:

[0032] A method for optimizing the flotation of copper-molybdenum mixed concentrate is as follows:

[0033] 500g of dried copper-molybdenum mixed concentrate was weighed and ground to a particle size of 24.2µm. The concentrate was then fed into an electrostatic separator with the following parameters:

[0034] Voltage 23.12KV, drum speed 117.75r / min, concentrate baffle angle of electrostatic separator 4.18°;

[0035] The multi-element analysis of the flotation feed concentrate is shown in Table 1 below, and the XRD analysis diagram is shown in the figure below. Figure 2 ;

[0036] Table 1: Multi-element chemical analysis after electro-separation (wt / %)

[0037]

[0038] The copper-molybdenum mixed concentrate was treated by adding 0 mg / L sodium sulfide (Rønning's reagent) as an inhibitor, followed by 5 min of reaction. Then, 40 mg / L kerosene as a collector was added, and the mixture was treated for 3 min. Finally, 20 mg / L MIBC as a frother was added, and the mixture was treated for 30 s. After that, the aeration device was turned on, and the aeration rate was 0.05 m³ / h. 3 / h, after aeration for 30s, skim off the bubbles for flotation;

[0039] This resulted in a chalcopyrite grade of 26.9% and a molybdenite recovery rate of 70% in the flotation concentrate.

[0040] Comparative Example 1:

[0041] A method for optimizing the flotation of copper-molybdenum mixed concentrate is as follows:

[0042] Weigh 500g of dried copper-molybdenum mixed concentrate and grind it to a particle size of 24.2um.

[0043] The multi-element analysis of the flotation feed concentrate is shown in Table 2 below, and the XRD analysis diagram is as follows. Figure 2 ;

[0044] Table 2: Multi-element chemical analysis (wt%) of copper-molybdenum mixed concentrate

[0045]

[0046] The unseparated copper-molybdenum mixed concentrate was treated by adding 0 mg / L sodium sulfide (Rorn's reagent) as an inhibitor for 5 minutes, followed by 40 mg / L kerosene as a collector for 3 minutes, then 20 mg / L MIBC as a frother for 30 seconds. Afterward, the aeration device was turned on, and the aeration rate was 0.05 m³ / min. 3 / h. After aeration for 30 seconds, skim off the bubbles for flotation;

[0047] This resulted in a chalcopyrite grade of 27.87% and a molybdenite recovery rate of 68% in the flotation concentrate.

[0048] In summary, based on Example 1 and Comparative Example 1, it can be seen that after electrostatic separation, the copper and molybdenum content in the flotation feed increases, while the gangue mineral content decreases. Under the same flotation conditions, the chalcopyrite grade in the final flotation concentrate decreases after electrostatic separation, while the molybdenite recovery rate increases. This also indicates that the flotation of copper-molybdenum mixed concentrate is optimized through three pretreatments: drying, grinding, and electrostatic separation.

[0049] Example 2:

[0050] A method for optimizing the flotation of copper-molybdenum mixed concentrate is as follows:

[0051] 500g of dried copper-molybdenum mixed concentrate was weighed and ground to a particle size of 24.2µm. The concentrate was then fed into an electrostatic separator with the following parameters:

[0052] Voltage 23.12KV, drum speed 117.75r / min, concentrate baffle angle of electrostatic separator 4.18°;

[0053] The copper-molybdenum mixed concentrate was subjected to electrostatic separation. Sodium sulfide (Rønning's reagent) 200 mg / L was added as an inhibitor, and the mixture was allowed to react for 5 minutes. Then, kerosene 40 mg / L was added as a collector, and the mixture was allowed to react for 3 minutes. Finally, MIBC 20 mg / L was added as a frother, and the mixture was allowed to react for 30 seconds. The aeration device was then turned on, and the aeration rate was 0.05 m³ / min. 3 / h, after aeration for 30s, skim off the bubbles for flotation.

[0054] This resulted in a chalcopyrite grade of 26.8% and a molybdenite recovery rate of 74.5% in the flotation concentrate.

[0055] Comparative Example 2:

[0056] A method for optimizing the flotation of copper-molybdenum mixed concentrate is as follows:

[0057] Weigh 500g of dried copper-molybdenum mixed concentrate and grind it to a particle size of 24.2um.

[0058] The multi-element analysis of the flotation feed concentrate is shown in Table 2, and the XRD analysis diagram is shown in the figure. Figure 2 ;

[0059] The copper-molybdenum mixed concentrate was subjected to electrostatic separation. Sodium sulfide (Rønning's reagent) 200 mg / L was added as an inhibitor, and the mixture was allowed to react for 5 minutes. Then, kerosene 40 mg / L was added as a collector, and the mixture was allowed to react for 3 minutes. Finally, MIBC 20 mg / L was added as a frother, and the mixture was allowed to react for 30 seconds. The aeration device was then turned on, and the aeration rate was 0.05 m³ / min. 3 / h, after aeration for 30s, skim off the bubbles for flotation;

[0060] This resulted in a chalcopyrite grade of 27.79% and a molybdenite recovery rate of 64.1% in the flotation concentrate.

[0061] In summary, based on Example 2 and Comparative Example 2, it can be seen that after electrostatic separation, the copper and molybdenum content in the flotation feed increases, while the gangue mineral content decreases. Under the same flotation conditions, the chalcopyrite grade in the final flotation concentrate decreases while the molybdenite recovery rate increases after electrostatic separation. This indicates that the flotation of copper-molybdenum mixed concentrate is optimized through three pretreatments: drying, grinding, and electrostatic separation.

[0062] Example 3:

[0063] A method for optimizing the flotation of copper-molybdenum mixed concentrate is as follows:

[0064] 500g of dried copper-molybdenum mixed concentrate was weighed and ground to a particle size of 24.2µm. The concentrate was then fed into an electrostatic separator with the following parameters:

[0065] Voltage 23.12KV, drum speed 117.75r / min, concentrate baffle angle of electrostatic separator 4.18°;

[0066] The copper-molybdenum mixed concentrate was subjected to electrostatic separation. Sodium sulfide (Rønning's reagent) 400 mg / L was added as an inhibitor, and the mixture was allowed to react for 5 minutes. Then, kerosene 40 mg / L was added as a collector, and the mixture was allowed to react for 3 minutes. Finally, MIBC 20 mg / L was added as a frother, and the mixture was allowed to react for 30 seconds. The aeration device was then turned on, and the aeration rate was 0.05 m³ / min. 3 / h, after aeration for 30s, skim off the bubbles for flotation;

[0067] This resulted in a chalcopyrite grade of 26.88% and a molybdenite recovery rate of 72.18% in the flotation concentrate.

[0068] Comparative Example 3:

[0069] A method for optimizing the flotation of copper-molybdenum mixed concentrate is as follows:

[0070] Weigh 500g of dried copper-molybdenum mixed concentrate and grind it to a particle size of 24.2um.

[0071] The multi-element analysis of the flotation feed concentrate is shown in Table 2, and the XRD analysis diagram is shown in the figure. Figure 2 ;

[0072] Add 400 mg / L sodium sulfide (Ron's reagent) as an inhibitor to the electrostatically separated copper-molybdenum mixed concentrate, and let it react for 5 minutes. Then add 40 mg / L kerosene as a collector, and let it react for 3 minutes. Then add 20 mg / L MIBC as a frother, and let it react for 30 seconds. Finally, turn on the aeration device and aerate at a rate of 0.05 m³ / h. 3 / h, after aeration for 30s, skim off the bubbles for flotation;

[0073] This resulted in a chalcopyrite grade of 28.39% and a molybdenite recovery rate of 64.5% in the flotation concentrate.

[0074] In summary, based on Example 3 and Comparative Example 3, it can be seen that after electrostatic separation, the copper and molybdenum content in the flotation feed increases, while the gangue mineral content decreases. Under the same flotation conditions, the chalcopyrite grade in the final flotation concentrate decreases while the molybdenite recovery rate increases after electrostatic separation. This also indicates that the flotation of copper-molybdenum mixed concentrate is optimized through three pretreatments: drying, grinding, and electrostatic separation.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0076] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method of optimizing the flotation of copper-molybdenum bulk concentrates, characterized by, The method comprises the following steps: S1: a certain volume of copper-molybdenum mixed concentrate is weighed and put into a dryer for drying treatment; S2: the dried copper-molybdenum mixed concentrate is put into a grinder for grinding to a medium particle size; S3: the copper-molybdenum mixed concentrate ground to a medium particle size is put into an electric separator for electric selection pretreatment to obtain electric selection concentrate, electric selection middlings and electric selection tailings, and the electric selection middlings and electric selection tailings are combined as final electric selection tailings; S4: a flotation agent is added to the electric selection concentrate in S3 to obtain final flotation concentrate and flotation tailings; S5: the final electric selection tailings in S3 and the flotation tailings in S4 are mixed and put into a cleaning flotation machine for cleaning flotation to obtain cleaning concentrate and final flotation tailings; S6: the cleaning concentrate obtained in S5 is put into S4 again to be floated again with the electric selection concentrate obtained in S3, and only final flotation concentrate and final flotation tailings are obtained through asynchronous flotation; In S4, the specific steps of adding the flotation agent to the electric selection concentrate in S3 are as follows: P1: an inhibitor is added to the electric selection concentrate, and the action time is 5 min; P2: on the basis of P1, a collector is added thereto, and the action time is 3 min; P3: On the basis of P2, a frother was added into it, after 30 s, the switch of the aerator was opened, the gas was injected at the speed of 0.05 m 3 / h, after 30 s of aeration, the froth was scraped and flotation was carried out.

2. A method of optimizing the flotation of copper-molybdenum bulk concentrates according to claim 1, characterized in that, The voltage of the electric separator is 23.12KV, and the rotating speed is 117.75r / min.

3. A method of optimizing the flotation of copper-molybdenum bulk concentrates according to claim 2, characterized in that, The electric separator is provided with a concentrate baffle, and the angle of the concentrate baffle is 4.18°.

4. A method of optimizing the flotation of copper-molybdenum bulk concentrates as claimed in claim 1, wherein, The medium particle size is 24-30um.

5. A method of optimizing the flotation of copper-molybdenum bulk concentrates as claimed in claim 1, wherein, The flotation agent in S4 comprises an inhibitor, a collector and a foaming agent; the inhibitor comprises sodium sulfide or sodium carboxymethyl sodium trithiocarbonate; the collector comprises kerosene or butyl xanthate; and the foaming agent comprises 2# oil or methyl isobutyl carbinol.

6. A method of optimizing the flotation of a copper-molybdenum bulk concentrate according to claim 5, characterized in that, The dosage of the sodium sulfide is 200-400mg / L, the dosage of the kerosene is 40-200mg / L, and the dosage of the methyl isobutyl carbinol is 20mg / L.

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