Multi-metal low-grade flotation tailing metal recovery system

Abstract

The utility model relates to a multi-metal low-grade flotation tailing metal recovery system which comprises a stirring barrel, a discharging port of the stirring barrel is connected to a feeding port of a hydrocyclone through a sand pump, a sand settling port of the hydrocyclone is connected to a feeding port of a ball mill, and a discharging port of the ball mill is connected to a feeding port of a sand pump pool. An overflow opening of the hydrocyclone is connected to a feeding opening of the roughing flotation machine, a concentrate discharging opening of the roughing flotation machine is sequentially connected to the first flotation classificator, the second flotation classificator and the third flotation classificator, and a concentrate discharging opening of the third flotation classificator is connected to the first cyaniding carbon pulp system. According to the recovery system, concentrate and tailings of raw ore are subjected to roughing separation, then the roughing concentrate and the roughing tailings are subjected to three-stage concentration and two-stage scavenging, valuable metal is enriched in the concentrate as far as possible, the concentrate grade is improved, the scavenged tailings are further enriched and recovered through two-stage magnetic separation, and the recovery efficiency is improved. And finally, valuable metals in the concentrate are efficiently recovered by combining a cyaniding carbon slurry system.

Description

TECHNICAL FIELD

[0001] The utility model relates to tailing recovery technical field, concretely relates to a kind of multi-metal low-grade flotation tailings metal recovery system. BACKGROUND

[0002] Gold mine as important mineral resources, its characteristics are in complex associated mineral components, in the flotation process produces a large amount of tailings, the traditional processing mode is tailings dam storage, large area, high maintenance cost, and easy to cause environmental pollution and metal resource waste.

[0003] In prior art, it is difficult to recover valuable metal from tailings by flotation and one-stage magnetic separation, and the grade of valuable metal in tailings is required to be higher, and the recovery rate is lower. SUMMARY

[0004] In view of the above analysis, the utility model provides a kind of multi-metal low-grade flotation tailings metal recovery system, to improve the recovery rate of low-grade flotation tailings valuable metal.

[0005] To achieve the above object, the specific technical scheme of the utility model is as follows: a kind of multi-metal low-grade flotation tailings metal recovery system, including agitator tank, the discharge outlet of the agitator tank is connected to the feed inlet of hydrocyclone by sand pump, the sand outlet of the hydrocyclone is connected to the feed inlet of ball mill, and the discharge outlet of the ball mill is connected to the feed inlet of sand pump pool;The overflow port of the hydrocyclone is connected to the feed inlet of rough flotation machine, and the concentrate discharge outlet of the rough flotation machine is sequentially connected to flotation cleaner one, flotation cleaner two and flotation cleaner three, and the concentrate discharge outlet of the flotation cleaner three is connected to cyanide carbon slurry system one;The tailings discharge outlet of the rough flotation machine is sequentially connected to flotation scavenger one and flotation scavenger two, the concentrate discharge outlet of the flotation scavenger one is connected to the feed inlet of rough flotation machine, the tailings discharge outlet of the flotation scavenger two is connected to the feed inlet of barrel magnetic separator one, the concentrate discharge outlet of the barrel magnetic separator one is connected to the feed inlet of barrel magnetic separator two, and the concentrate discharge outlet of the barrel magnetic separator two is connected to cyanide carbon slurry system two.

[0006] Further, preferably, the tailings discharge outlet of the flotation cleaner one is connected to the feed inlet of rough flotation machine, to realize the cyclic treatment of cleaning tailings.

[0007] Further, preferably, the tailings discharge outlet of the barrel magnetic separator two is connected to the feed inlet of barrel magnetic separator one, to realize the cyclic treatment of secondary magnetic separation tailings.

[0008] Further, preferably, the tailings discharge outlet of the barrel magnetic separator one is connected to thickener two.

[0009] Further, preferably, the cyanidation carbon pulp system one and the cyanidation carbon pulp system two each comprise a plurality of leaching tanks connected in series, the concentrate discharge outlets of the third flotation cleaning machine and the second drum magnetic separator are connected to the feed inlet of the first leaching tank, and the discharge outlet of the last leaching tank is connected to the second vibrating screen, and a thickener is connected below the screen of the second vibrating screen; a first vibrating screen is further arranged above the feed inlet of the first leaching tank, and the screen of the first vibrating screen is connected to a gold-loaded carbon storage tank.

[0010] The beneficial effects of the utility model are that: the recovery system first roughens the ground ore, preliminarily separates the concentrate and the tailings, then separately carries out three-stage cleaning and two-stage scavenging on the roughed concentrate and the roughed tailings, returns the two-stage scavenged concentrate to the roughing link to recycle and enrich, enriches the valuable metals in the concentrate as much as possible, and improves the concentrate grade; the scavenging tailings are further enriched and recycled through two-stage magnetic separation, and finally, the valuable metals in the cleaning concentrate and the magnetic separation concentrate are recycled by combining the cyanidation carbon pulp system, and gold-loaded carbon and leaching slag are obtained through cyanidation leaching and activated carbon adsorption, so that the valuable metals such as gold, silver and iron in the multi-metal low-grade flotation tailings are efficiently recycled, and the gold, silver and iron recovery reaches 45.63%, 4.49% and 12.94% respectively. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a device association diagram of the multi-metal low-grade flotation tailings metal recovery system of embodiment 1;

[0012] Figure 2 It is a top view of the multi-metal low-grade flotation tailings metal recovery system of embodiment 2;

[0013] In the figure: 1-stirring barrel, 3-sand pump, 4-ball mill, 5-hydrocyclone, 6-flotation roughing machine, 7-flotation scavenging machine one, 8-flotation scavenging machine two, 9-flotation cleaning machine one, 10-flotation cleaning machine two, 11-flotation cleaning machine three, 12-first vibrating screen, 13-gold-loaded carbon storage tank, 14-leaching tank, 15-second vibrating screen, 16-first thickener, 17-first drum magnetic separator, 18-second drum magnetic separator, 19-second thickener. DETAILED DESCRIPTION

[0014] In order to make the technical problems and technical solutions solved by the utility model more clear and explicit, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the utility model.

[0015] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0017] like Figure 1 As shown, this embodiment provides a multi-metal low-grade flotation tailings metal recovery system, including a stirring tank 1. The discharge port of the stirring tank 1 is connected to the feed port of a hydrocyclone 5 via a sand pump 3. The sand discharge port of the hydrocyclone 5 is connected to the feed port of a ball mill 4. The discharge port of the ball mill 4 is connected to the feed port of a sand pump tank 2. This part constitutes a closed-circuit grinding and classification system. Moreover, the design of classifying before grinding may avoid over-grinding of fine-grained minerals in the raw ore, thereby ensuring that the raw ore is ground to a particle size suitable for flotation.

[0018] The overflow port of the hydrocyclone 5 is connected to the feed port of the rougher flotation machine 6. The concentrate outlet of the rougher flotation machine 6 is sequentially connected to the first cleaner flotation machine 9, the second cleaner flotation machine 10, and the third cleaner flotation machine 11. The concentrate outlet of the third cleaner flotation machine 11 is connected to the cyanide carbon-in-pulp system one. The tailings outlet of the first cleaner flotation machine 9 is connected to the feed port of the rougher flotation machine 6. During flotation, this section first roughens the classified minerals, and then performs three-stage cleaning on the concentrate obtained from the roughing process. Since the three cleaner flotation machines are connected, the concentrate obtained from each stage of flotation will sequentially enter the next stage cleaner flotation machine, while the tailings will return to the previous stage cleaner flotation machine in reverse order. Finally, the cleaned concentrate enters the cyanide carbon-in-pulp system one from the third cleaner flotation machine 11, and the cleaned tailings return to the rougher flotation machine 6 from the first cleaner flotation machine 9, realizing the recycling of the cleaned tailings and maximizing the enrichment of valuable metals through flotation.

[0019] The tailings outlet of the roughing flotation machine 6 is connected in sequence to the flotation scavenger 7 and the flotation scavenger 8. The concentrate outlet of the flotation scavenger 7 is connected to the feed inlet of the roughing flotation machine 6. The tailings outlet of the flotation scavenger 8 is connected to the feed inlet of the drum magnetic separator 17. The concentrate outlet of the drum magnetic separator 17 is connected to the feed inlet of the drum magnetic separator 18. The concentrate outlet of the drum magnetic separator 18 is connected to the cyanide carbon slurry system 2. Specifically, this section performs two scavenging processes on the tailings obtained from the roughing process. Since the two flotation scavengers are connected, the tailings from flotation scavenger 17 flow to flotation scavenger 28, while the concentrate from flotation scavenger 28 is reversed and returned to flotation scavenger 17. Finally, the scavenged concentrate is returned from flotation scavenger 17 to the roughing flotation machine 6, realizing the recycling of scavenged tailings and maximizing the enrichment of valuable metals by flotation. The scavenged tailings enter the drum magnetic separator 17 and drum magnetic separator 28 for magnetic separation. The magnetically separated concentrate is processed through the cyanide carbon-in-pulp system 2 to obtain gold-loaded carbon and iron concentrate leaching residue.

[0020] Preferably, the tailings outlet of the second drum magnetic separator 18 is connected to the feed inlet of the first drum magnetic separator 17 to realize the recycling of tailings from secondary magnetic separation and to enrich valuable metals by flotation as much as possible.

[0021] Preferably, the tailings outlet of the cylindrical magnetic separator 17 is connected to the thickening tank 19 to concentrate and collect the tailings and transfer them to a cyanide-free tailings pond.

[0022] Preferably, both the cyanide carbon slurry system one and the cyanide carbon slurry system two include several leaching tanks 14 connected in series. The concentrate outlets of the flotation separator three 11 and the drum magnetic separator two 18 are connected to the inlet of the first leaching tank. The outlet of the end leaching tank is connected to the vibrating screen two 15. A thickening tank one 16 is connected below the screen of the vibrating screen two 15. A vibrating screen one 12 is also provided above the inlet of the first leaching tank. The screen of the vibrating screen one 12 is connected to the gold-loaded carbon storage tank 13.

[0023] Specifically, both the fine concentrate and the magnetic concentrate are subjected to cyanide leaching and adsorption operations through a cyanide carbon-in-pulp system with the same structure, ultimately obtaining gold-loaded carbon.

[0024] During cyanide leaching, the concentrate from flotation separator 311 and drum magnetic separator 218 enters the first leaching tank for cyanide leaching. To facilitate slurry flow, the leaching tanks are installed in a stepped series. Sodium cyanide solution and lime are added to the middle leaching tanks for cyanide leaching. Activated carbon is added to the end leaching tank to adsorb the leached valuable metals, forming gold-loaded carbon. An air lifter in the leaching tank elevates the gold-loaded carbon into the previous leaching tank for countercurrent adsorption, and so on, until the second leaching tank. The countercurrently adsorbed gold-loaded carbon is removed from the second leaching tank and separated by vibrating screen 12. The slurry is returned to the first leaching tank for circulation, while the gold-loaded carbon enters the gold-loaded carbon storage tank 13. The fine gold-loaded carbon particles that are lost after leaching are returned to the slurry by vibrating screen 215, and the leachate is concentrated in thickening tank 16. The resulting tailings enter the cyanide tailings pond.

[0025] Finally, the gold-loaded carbon obtained from the two cyanide carbon-in-pulp systems enters the desorption-electrolysis system, where valuable metal slime, lean carbon, and lean liquor are obtained after desorption-electrolysis. This achieves the recovery of metals from low-grade polymetallic flotation tailings.

[0026] In summary, this recovery system first roughens the ground raw ore (polymetallic low-grade flotation tailings), initially separating the concentrate and tailings. Then, the roughing concentrate and tailings undergo three-stage cleaning and two-stage scavenging, respectively. The scavenging concentrate is returned to the roughing stage for recycling and enrichment, maximizing the recovery of valuable metals. Multiple flotation stages also improve the concentrate grade. The scavenging tailings are further enriched through two-stage magnetic separation to further improve the concentrate grade. Finally, a cyanide carbon-in-pulp system recovers valuable metals from the cleaned and magnetic concentrates. After cyanide leaching and activated carbon adsorption, gold-loaded carbon and leaching residue are obtained, thus achieving efficient recovery of valuable metals such as gold, silver, and iron from polymetallic low-grade flotation tailings. Example 2

[0027] This embodiment provides a method for recovering metals from polymetallic low-grade flotation tailings using the above-mentioned recovery system, including the following steps:

[0028] (1) The tailings to be treated are fed into the mixing tank 1 for slurry preparation. After slurry preparation, the sand pump 3 is used to transport the slurry to the hydrocyclone 5 for classification, separating the slurry with a fineness of +0.043mm and -0.043mm. The slurry with a fineness of +0.043mm enters the ball mill 4 and is refmilled at a concentration of 70%. This cycle is repeated, and the overflow fineness of the hydrocyclone 5 is more than 80% with a fineness of -0.043mm.

[0029] (2) The overflow slurry of the hydrocyclone 5 is introduced into the flotation rougher 6 for roughing. The roughing time is 5 minutes. Before roughing, 200g / t of butyl xanthate is added and stirred for 2 minutes. Then, 20g / t of No. 2 oil is added and stirred for 2 minutes to obtain roughing concentrate and roughing tailings.

[0030] (3) The roughing concentrate is introduced into the flotation cleaner for three-stage cleaning. The cleaning time of flotation cleaner 19 and flotation cleaner 20 is 3 minutes, and the cleaning time of flotation cleaner 311 is 2 minutes. The concentrate obtained from each cleaner enters the next cleaner in sequence, and the tailings are returned to the previous cleaner in sequence. Finally, the cleaned concentrate flows to flotation cleaner 311, and the cleaned tailings flow back to flotation cleaner 19 for recycling.

[0031] (4) The selected concentrate is transferred to the cyanide carbon slurry system for cyanide leaching and adsorption. The cyanide leaching conditions are: lime pH value of 11, stirring speed of 1200 r / min, liquid-solid ratio of 2:1, sodium cyanide dosage of 3 kg / t, to obtain gold-loaded carbon, leaching residue and leaching solution.

[0032] (5) The roughing tailings are introduced into the flotation scavenger for two-stage scavenging. The scavenging time of flotation scavenger 17 is 2 minutes. Before scavenging, 50g / t of butyl xanthate is added and stirred for 2 minutes. Then, 20g / t of No. 2 oil is added and stirred for 2 minutes. The tailings of flotation scavenger 17 enter flotation scavenger 28. The concentrate of flotation scavenger 28 is returned to flotation scavenger 17. Finally, the scavenged concentrate is returned from flotation scavenger 17 to roughing flotation 6 for recycling. The scavenged tailings are transferred from flotation scavenger 28 to drum magnetic separator 17.

[0033] (6) The drum magnetic separator 17 performs weak magnetic roughing on the scavenging tailings with a magnetic field strength of 0.4T. The tailings from the weak magnetic roughing are concentrated in the thickening tank 19 and then enter the cyanide-free tailings pond. The concentrate from the weak magnetic roughing enters the drum magnetic separator 18 for weak magnetic cleaning with a magnetic field strength of 0.2T. The tailings from the weak magnetic cleaning are returned to the drum magnetic separator 17 for recycling, while the concentrate from the weak magnetic cleaning enters the cyanide carbon slurry system 2.

[0034] (7) The cyanide carbon slurry system II performs cyanide leaching and adsorption on the weak magnetic concentrate. The cyanide leaching conditions are: lime pH value of 11, stirring speed of 1200 r / min, liquid-solid ratio of 2:1, sodium cyanide dosage of 1 kg / t, to obtain gold-loaded carbon, leaching residue and leaching solution.

[0035] (8) The gold-loaded carbon obtained in steps (4) and (7) is separated by vibrating screen 12 and then subjected to analytical smelting to obtain the product of gold and silver; the leaching residue is separated and concentrated by vibrating screen 15 and thickening tank 16 and then discharged into the corresponding tailings pond. The leaching residue filtered out in step (7) is iron concentrate (cyanide slag).

[0036] Application Example 1

[0037] This application example focuses on polymetallic low-grade flotation tailings, whose specific mineral characteristics are as follows:

[0038] 1.1 Analysis of Main Elements

[0039] The results of the chemical analysis of the main elements are shown in Table 1.

[0040] Table 1: Results of Major Elemental Analysis

[0041]

[0042] Note: *The unit for each element is g / t.

[0043] The results in Table 1 show that the sample has a total iron grade of 26.05%, a gold content of 0.40 g / t, and a silver content of 2.61 g / t. The grades of other elements are low and have no recovery value. Therefore, the main recovery targets for this type of tailings are iron, gold, and silver.

[0044] 1.2 Iron phase analysis

[0045] To understand the phase composition of iron in the tailings, further phase analysis of iron was conducted, as shown in Table 2.

[0046] Table 2: Results of iron phase analysis

[0047]

[0048] The results in Table 2 show that the main iron minerals in the tailings are hematite, magnetite, and ferrosilicon, accounting for 36.57%, 23.36%, and 19.63% respectively, followed by siderite, with pyrite having the lowest percentage. It is evident that the iron minerals with a large proportion in the tailings are strongly magnetic; therefore, a weak magnetic separation process should be used during magnetic separation.

[0049] 1.3 Particle size and metal distribution

[0050] The particle size and metal distribution results are shown in Table 3.

[0051] Table 3: Results of Particle Size and Metal Distribution Measurement

[0052]

[0053] Table 3 shows that, in terms of particle size composition, the tailings are mainly distributed in the +0.074, -0.074+0.043, and -0.025 mm sizes, accounting for 27.01%, 29.51%, and 22.22% respectively. Furthermore, the gold and silver grades increase with increasing fineness. In terms of metal distribution, the gold and silver in the tailings are mainly distributed in the +0.074, -0.074+0.043, and -0.025 mm particle sizes, with the -0.025 mm particle size accounting for 45.86% of gold and 31.31% of silver. Given this, the particle size was determined to be -0.043 mm during the grinding and classification of the raw ore.

[0054] 2. Specific Implementation

[0055] Using the recovery method described in Example 2, iron, gold, and silver were recovered from the polymetallic low-grade flotation tailings of this application example. The specific situation of valuable metals at each stage of the recovery process is shown in Table 4.

[0056] Table 4: Results of the Full-Process Test

[0057]

[0058] Table 4 shows that the recovery method described in Example 2 can effectively recover gold, silver, and iron from low-grade polymetallic flotation tailings. Specifically, the flotation cleaning + cyanide leaching process mainly recovers gold and silver from the cleaned concentrate, achieving a gold recovery rate of 34.57% and a silver recovery rate of 4.11%. The magnetic separation + cyanide leaching process mainly recovers gold, silver, and iron from the scavenged tailings, achieving a gold recovery rate of 11.06%, a silver recovery rate of 0.38%, and an iron recovery rate of 12.94%. Compared to the raw ore, the entire process system recovers 45.63% of gold, 4.49% of silver, and 12.94% of iron, indicating a relatively high recovery rate.

[0059] The present invention has been described in detail above through specific and preferred embodiments. However, those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications or equivalent substitutions made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polymetallic low-grade flotation tailings metal recovery system, characterized in that: The system includes a mixing tank (1), the outlet of which is connected to the inlet of a hydrocyclone (5) via a sand pump (3), the sand outlet of which is connected to the inlet of a ball mill (4), and the outlet of which is connected to the inlet of a sand pump tank (2); the overflow outlet of the hydrocyclone (5) is connected to the inlet of a roughing flotation machine (6), and the concentrate outlet of the roughing flotation machine (6) is sequentially connected to flotation cleaner one (9), flotation cleaner two (10), and flotation cleaner three (11), the flotation cleaner three (9) being ... connected to the inlet of a flotation cleaner two (9), flotation cleaner two (10), and flotation cleaner three (11) being connected to the inlet of a sand pump tank (2); the overflow outlet of the hydrocyclone (5) is connected to the inlet of a roughing flotation machine (6), and the concentrate outlet of the roughing flotation machine (6) is connected to the inlet of a flotation cleaner three (9), flotation cleaner two (10), and flotation cleaner three (11) being connected to the inlet of a sand pump tank (2); the overflow outlet of the roughing flotation machine (9) is connected to the inlet of a sand pump tank (1), and the overflow outlet of the roughing flotation machine (9) is connected to the inlet of a sand pump tank (2), and the overflow 1) The concentrate outlet is connected to the cyanide carbon slurry system one; the tailings outlet of the rougher flotation machine (6) is connected in sequence to the flotation scavenger one (7) and the flotation scavenger two (8), the concentrate outlet of the flotation scavenger one (7) is connected to the feed inlet of the flotation rougher (6), the tailings outlet of the flotation scavenger two (8) is connected to the feed inlet of the drum magnetic separator one (17), the concentrate outlet of the drum magnetic separator one (17) is connected to the feed inlet of the drum magnetic separator two (18), and the concentrate outlet of the drum magnetic separator two (18) is connected to the cyanide carbon slurry system two.

2. The polymetallic low-grade flotation tailings metal recovery system according to claim 1, characterized in that: The tailings outlet of the flotation cleaning machine (9) is connected to the feed inlet of the roughing flotation machine (6) to realize the recycling of the cleaned tailings.

3. The polymetallic low-grade flotation tailings metal recovery system according to claim 1, characterized in that: The tailings outlet of the second drum magnetic separator (18) is connected to the feed inlet of the first drum magnetic separator (17) to realize the recycling of tailings from secondary magnetic separation.

4. A polymetallic low-grade flotation tailings metal recovery system according to claim 3, characterized in that: The tailings outlet of the first cylindrical magnetic separator (17) is connected to the second thickening tank (19).

5. A polymetallic low-grade flotation tailings metal recovery system according to any one of claims 1-4, characterized in that: Both the cyanide carbon slurry system one and the cyanide carbon slurry system two include several leaching tanks (14) connected in series. The concentrate outlets of the flotation cleaning machine three (11) and the drum magnetic separator two (18) are connected to the feed inlet of the first leaching tank. The outlet of the end leaching tank is connected to the vibrating screen two (15). The screen of the vibrating screen two (15) is connected to the thickening tank one (16). The first leaching tank is also provided above the feed inlet of the first leaching tank. The screen of the vibrating screen one (12) is connected to the gold-loaded carbon storage tank (13).

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