Device for recovering molybdenite from fine silt

Abstract

The utility model relates to a device for recovering molybdenite from fine silt in the field of preparation equipment. The device comprises a thickener I, a discharging pipe of the first thickener is connected with a sand pump pool, the sand pump pool is connected with a swirler through a guide pipe, the discharging end of the swirler is connected with a first stirring barrel, the discharging end of the first stirring barrel is connected with a first flotation machine, the discharging end of the first flotation machine is connected with a second thickener, and the discharging end of the second thickener is connected with a second stirring barrel. The discharging end of the second stirring barrel is connected with a second flotation machine, and tailings of the second flotation machine are conveyed into the first thickener through a first feeding pump. The device is reasonable in structure, easy to operate, low in reaction condition requirement and the like, the removal rate of mud ranging from-5 mu m to 10 mu m is high, the contact opportunity of fine-fraction molybdenite and beneficiation reagents is increased, therefore, the recovery rate of the molybdenite is improved, it is guaranteed that the flotation concentration can meet the process requirement, the automation degree is high, mud removal and concentration control are more accurate, and the production efficiency is improved. Molybdenum concentrate grade and recovery rate can be better improved, and mineral resource utilization rate is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mineral processing equipment, specifically relating to a device for recovering molybdenite from fine mud. Background Technology

[0002] The recovery of associated molybdenite from polymetallic sulfide ores typically involves gravity separation followed by flotation. Since gravity separation usually includes washing and desliming processes, the recovery of molybdenite from the fine slime primarily involves thickening the slurry using a conventional thickener, followed by flotation of the thickener underflow with the addition of kerosene and No. 2 oil. However, during operation, it was found that the flotation concentration of the fine slime was often less than 20%, failing to meet the process requirement of a flotation concentration of at least 30%, and containing a significant amount of -5µm to 10µm fine slime, resulting in poor desliming. Since 5µm to 10µm is the lower limit for flotation particle size, the slime often agglomerates, encapsulating the molybdenite to be recovered. The fine slime also hinders contact between the beneficiation reagents and the molybdenite, thus reducing the molybdenite recovery rate and wasting mineral resources. Therefore, it is necessary to improve the existing recovery equipment, specifically by developing a device for recovering molybdenite from the fine slime to solve the aforementioned technical problems. Summary of the Invention

[0003] To address the aforementioned deficiencies in the existing technology, this utility model provides an apparatus for recovering molybdenite from fine mud, comprising a thickener one; the discharge pipe of the thickener one is connected to a sand pump tank, the sand pump tank is connected to a hydrocyclone via a conduit, the discharge end of the hydrocyclone is connected to a stirring tank one, the discharge end of the stirring tank one is connected to a flotation machine one, the discharge end of the flotation machine one is connected to a thickener two, the discharge end of the thickener two is connected to a stirring tank two, the discharge end of the stirring tank two is connected to a flotation machine two, and the tailings of the flotation machine two are transported into the thickener one via a feed pump one.

[0004] Preferably, the first thickener is a high-cone deep inclined plate thickener, and the first thickener is provided with multiple sets of inclined baffle plates. The height of the first thickener is greater than the height of the second thickener, and the second thickener is a conventional thickener.

[0005] Preferably, the discharge pipe is equipped with an electric switch, and the electric switch is connected to an online concentration detector.

[0006] Preferably, the sand pump tank and the hydrocyclone are connected by a second feed pump, and the discharge end of the hydrocyclone is equipped with an online concentration detector, which is electrically connected to the second feed pump.

[0007] This invention also includes other components that enable the normal operation of an apparatus for recovering molybdenite from fine mud, such as control components for thickener one, thickener two, flotation machine one, flotation machine two, feed pump one, feed pump two, hydrocyclone, mixing tank one, mixing tank two, electric switch, online concentration detector one, and online concentration detector two, etc., all of which are conventional technologies in the field. Furthermore, devices or components not limited in this invention, such as thickeners, mixing tanks, feed pumps, electric switches, online concentration detectors, hydrocyclones, and feed pumps, all employ conventional technologies and equipment in the field.

[0008] Working principle: After the slurry is concentrated by the high cone deep inclined plate thickener, some of the -5um~10um fine mud is removed in the overflow. The fine-grained molybdenite settles to the bottom of the high cone deep inclined plate thickener. The high cone deep inclined plate thickener is higher than ordinary thickener, so the fine-grained minerals have a longer settling distance and a longer settling time. In addition, the multiple sets of inclined baffles inside the thickener block the fine-grained minerals layer by layer. The interaction of the two can prevent the fine-grained molybdenite from being lost from the overflow port of the high cone deep inclined plate thickener. Meanwhile, the discharge pipe of the high-cone deep inclined plate thickener is equipped with an electric switch, which is connected to an online concentration detector. The opening size of the electric switch is adjusted according to the data from the online concentration detector. The material enters the sand pump tank through the electric switch. An appropriate amount of hydrogen peroxide with a concentration of 10% is added to the sand pump tank. The function of hydrogen peroxide is to oxidize and decompose polyaluminum chloride and to disperse sludge. A hydrocyclone is installed on the outlet pipe of the second feed pump. An online concentration detector is installed at the outlet of the hydrocyclone. The online concentration detector is electrically connected to the second feed pump. The speed of the impeller of the second feed pump is adjusted according to the data from the online concentration detector, thereby adjusting the pressure of the slurry entering the hydrocyclone. The faster the impeller speed, the greater the pressure of the slurry fed into the hydrocyclone, the higher the concentration at the bottom of the hydrocyclone, and the more water is dewatered from the overflow of the hydrocyclone. Conversely, the remaining -5um~10um fine mud is removed again from the overflow of the hydrocyclone. At this point, the molybdenite-containing slurry discharged from the hydrocyclone reaches the required concentration. This slurry enters the first mixing tank, where kerosene, molybdenum oil No. 1, and No. 2 frothers are added and thoroughly stirred. It then enters the first flotation machine for roughing, cleaning, and scavenging. During the first scavenging, appropriate amounts of kerosene and No. 2 oil are added. The rough molybdenum concentrate from the first flotation enters the second thickener for concentration. The concentrated rough molybdenum concentrate from the second thickener enters the second mixing tank (containing water glass and sodium sulfide) and is thoroughly stirred before entering the second flotation machine. After four cleaning cycles, the middlings from each cleaning cycle are returned sequentially to the previous froth tank. Appropriate amounts of kerosene, water glass, and sodium sulfide are added to the second and fourth cleaning tanks. Finally, the scraper of the second flotation machine scrapes off the final qualified molybdenum concentrate. The tailings from the first scavenging of the second flotation machine are pumped into the top inlet of the high-cone inclined plate thickener by the first feed pump and re-enter the separation process. This process is repeated for the entire molybdenum separation process.

[0009] The beneficial effects of this utility model are: reasonable structure, simple operation, and lower reaction condition requirements compared with the prior art; high mud removal rate of -5umm to 10um; increased contact opportunities between fine-grained molybdenite and beneficiation reagents, thereby improving the molybdenite recovery rate; ensuring that the flotation concentration can meet the process requirements; high degree of automation; more precise desliming and concentration control; and better improvement of molybdenum concentrate grade and recovery rate, thereby improving the utilization rate of mineral resources. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a schematic diagram of the structure of a device for recovering molybdenite from fine mud according to an embodiment of the present invention;

[0012] Figure 2 This is a process flow diagram in an embodiment of the present utility model;

[0013] Figure 3 This is a schematic diagram of the concentrator in one embodiment of the present invention.

[0014] In the diagram: 1. Thickener 1; 2. Electric switch; 3. Online concentration detector 1; 4. Sand pump tank; 5. Hydrocyclone; 6. Feed pump 2; 7. Online concentration detector 2; 8. Mixing tank 1; 9. Flotation machine 1; 10. Thickener 2; 11. Mixing tank 2; 12. Flotation machine 2; 13. Feed pump 1; 14. Baffle plate. Detailed Implementation

[0015] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0016] Example

[0017] like Figure 1-2 As shown, this utility model provides an apparatus for recovering molybdenite from fine mud, including a thickener 1; the discharge pipe of the thickener 1 is connected to a sand pump tank 4, the sand pump tank 4 is connected to a hydrocyclone 5 through a conduit, the discharge end of the hydrocyclone 5 is connected to a stirring tank 8, the discharge end of the stirring tank 8 is connected to a flotation machine 9, the discharge end of the flotation machine 9 is connected to a thickener 10, the discharge end of the thickener 10 is connected to a stirring tank 11, the discharge end of the stirring tank 11 is connected to a flotation machine 12, and the tailings of the flotation machine 12 are transported into the thickener 1 through a feed pump 13.

[0018] The thickener 1 is a high-cone deep inclined plate thickener. The thickener 1 has multiple sets of inclined baffle plates 14. The height of the thickener 1 is greater than the height of the thickener 2 10. The thickener 2 10 is a conventional thickener.

[0019] The discharge pipe is equipped with an electric switch 2, and the electric switch is connected to an online concentration detector 3.

[0020] The sand pump tank 4 and the hydrocyclone 5 are connected by a second feed pump 6. The discharge end of the hydrocyclone 5 is equipped with an online concentration detector 7, which is electrically connected to the second feed pump 6.

[0021] During operation, the slurry is concentrated by the high-cone deep-inclined plate thickener, and some of the -5μm to 10μm fine mud is removed in the overflow. At the same time, a suitable amount of polyaluminum chloride flocculant with a concentration of 10% is added at the top inlet of the high-cone deep-inclined plate thickener to accelerate the settling of fine-grained molybdenite to the bottom of the thickener. The high-cone deep-inclined plate thickener is higher than that of ordinary thickeners, resulting in a longer settling distance and time for fine-grained minerals. In addition, the multiple sets of inclined baffle plates 14 inside the thickener layer by layer block the fine-grained minerals, and the interaction of the two can prevent fine-grained molybdenite from being lost from the overflow port of the high-cone deep-inclined plate thickener. Meanwhile, the discharge pipe of the high-cone deep inclined plate thickener is equipped with an electric switch 2, which is connected to an online concentration detector 3. The opening size of the electric switch 2 is adjusted according to the data from the online concentration detector 3. The material enters the sand pump tank 4 through the electric switch 2. An appropriate amount of hydrogen peroxide with a concentration of 10% is added to the sand pump tank 4. The function of hydrogen peroxide is to oxidize and decompose polyaluminum chloride and to disperse sludge. A hydrocyclone 5 is installed on the outlet pipe of the feed pump 6. An online concentration detector 7 is installed at the outlet of the hydrocyclone 5. The online concentration detector 7 is electrically connected to the feed pump 6. The speed of the impeller of the feed pump 6 is adjusted according to the data from the online concentration detector 7, thereby adjusting the pressure of the slurry entering the hydrocyclone 5. The remaining -5um to 10um fine mud is removed again from the overflow of the hydrocyclone 5. At this point, the molybdenite-containing slurry discharged from hydrocyclone 5 reaches the required concentration. This slurry enters mixing tank 8, where kerosene, molybdenum oil frother (No. 1 and No. 2), and other frothing agents are added and thoroughly stirred. It then enters flotation machine 9 for roughing, cleaning, and scavenging. During the first scavenging, appropriate amounts of kerosene and No. 2 oil are added. The rough molybdenum concentrate from the first flotation enters thickener 10 for concentration. The concentrated rough molybdenum concentrate from thickener 10 enters mixing tank 11 (containing water glass and sodium sulfide) and is thoroughly stirred before entering flotation machine 12. After four cleaning cycles, the middlings from each cleaning cycle are returned sequentially to the previous frothing tank. Appropriate amounts of kerosene, water glass, and sodium sulfide are added to cleaning tanks 2 and 4. Finally, the scraper of flotation machine 12 scrapes off the final qualified molybdenum concentrate. The tailings from the first scavenging of flotation machine 12 are pumped by feed pump 13 into the top inlet of the high-cone inclined plate thickener and re-enter the separation process. In this embodiment, Molybdenum 1# and kerosene are added as specific collectors for molybdenite. Molybdenum 1# only has a collecting effect on molybdenite and copper-containing sulfide ores, exhibiting good selectivity, but has no collecting effect on other sulfide ores and oxide ores. Molybdenum 1# has a certain foaming property and strong dispersibility in water, making it easier to contact molybdenite and increasing the collection opportunity. Kerosene, on the other hand, only has a collecting effect on molybdenite, has no collecting effect on other sulfide ores and oxide ores, and has a certain defoaming effect. At low temperatures, it forms emulsion droplets and is not easily dispersed in water. Compared to adding only kerosene, the combined use of Molybdenum 1# and kerosene can leverage the advantages of both and enhance the synergistic collecting effect on molybdenite.This also facilitates the separation of molybdenite from other minerals, thereby improving the grade of molybdenite concentrate.

[0022] The embodiments of this utility model have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An apparatus for recovering molybdenite from fine mud, comprising a thickener; characterized in that: The discharge pipe of the thickener 1 is connected to a sand pump tank, and the sand pump tank is connected to a hydrocyclone through a conduit. The discharge end of the hydrocyclone is connected to a mixing tank 1, the discharge end of the mixing tank 1 is connected to a flotation machine 1, the discharge end of the flotation machine 1 is connected to a thickener 2, the discharge end of the thickener 2 is connected to a mixing tank 2, the discharge end of the mixing tank 2 is connected to a flotation machine 2, and the tailings of the flotation machine 2 are transported into the thickener 1 by a feed pump 1.

2. The apparatus for recovering molybdenite from fine mud according to claim 1, characterized in that: The first thickener is a high-cone deep inclined plate thickener, which has multiple sets of inclined baffle plates inside. The height of the first thickener is greater than that of the second thickener.

3. The apparatus for recovering molybdenite from fine mud according to claim 1, characterized in that: The discharge pipe is equipped with an electric switch, which is connected to an online concentration detector.

4. The apparatus for recovering molybdenite from fine mud according to claim 1, characterized in that: The sand pump tank and the hydrocyclone are connected by a second feed pump. The discharge end of the hydrocyclone is equipped with an online concentration detector, which is electrically connected to the second feed pump.

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