System for recovering complex gold-containing pyrite in multi-metal flotation tailings

Abstract

The utility model relates to a recovery system for complex gold-bearing pyrite in multi-metal flotation tailings, which comprises a 1 # stirring barrel, a discharge port of the 1 # stirring barrel is connected to a feed port of a rapid classificator, and a discharge port of the rapid classificator is sequentially connected with a first-stage rough flotation machine, a second-stage rough flotation machine and a third-stage rough flotation machine. A tailing discharge port of the third-stage rough flotation machine is connected with a feed port of a pump pool, a discharge port of the pump pool is connected with a feed port of a pulse high-gradient magnetic separator through an ore pulp pump, and concentrate discharge ports of the first-stage rough flotation machine, the second-stage rough flotation machine and the third-stage rough flotation machine are all connected to a feed port of a second stirring barrel. A concentrate discharge port of the pulse high-gradient magnetic separator is connected to a feed port of the No.3 stirring barrel, and discharge ports of the No.2 stirring barrel and the No.3 stirring barrel are sequentially connected with a first concentrate flotation machine and a second concentrate flotation machine. According to the device, the recovery rate of complex gold-containing pyrite in the multi-metal flotation tailings is high, the reagent consumption is low, the control process is simple, and the economic index of the flotation technology is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of ore dressing process systems, and in particular relates to a system for recovering complex gold-containing pyrite in multi-metal flotation tailings. Background Art

[0002] Pyrite is an important mineral resource. In addition to containing a large amount of sulfur and iron minerals, it is often accompanied by beneficial components such as gold, silver, and cobalt. It is currently the main raw material for obtaining sulfur and iron resources and has good development and utilization value. In actual mineral processing, iron sulfide minerals are mainly associated with polymetallic sulfide ores. These iron sulfide minerals mainly exist in the form of pyrite, marcasite, arsenopyrite and pyrrhotite. They have good floatability under natural conditions, but lime and other materials are usually used to inhibit iron sulfide minerals during the flotation of such polymetallic sulfide ores, and other metal sulfides are preferably floated. After adding lime, a high-calcium and high-acid mineral processing environment will be formed. In this environment, hydrophilic components such as CaO, CaSO4, and Ca(OH)2 will adhere to the surface of iron sulfide minerals, making it difficult for iron sulfide minerals to be activated and floated, and thus lost in the tailings, resulting in a waste of sulfur and iron resources. The iron sulfide minerals in the tailings are very likely to generate acidic substances during the storage process, polluting the environment, and the iron sulfide minerals are also very easy to oxidize and denature, further reducing the floatability. The industry's scientific research team has carried out a lot of research on the recycling of this type of tailings, but has not yet developed a reliable and widely applicable recycling system.

[0003] For this type of tailings, recovery systems are currently used, such as Figure 2 As shown, after the tailings are added to the 1# mixing barrel 1 for activation and slurry mixing, they enter the sulfur roughing tank 13, the first scavenging tank 14, the second scavenging tank 15, the first flotation machine 11, and the second flotation machine 12 in sequence for one roughing, two scavenging, and two concentrating. The scavenging concentrate and the concentrating tailings are sequentially returned to the flotation process cycle of the previous stage, so that the sulfur concentrate and tailings are obtained by flotation. After long-term implementation, the system has a good recovery effect on pyrite with large and uniform embedded particle size and single occurrence state, but the recovery effect is not ideal for pyrite with uneven embedded particle size, high fine particle content, and complex occurrence state (including pyrite, marcasite, arsenopyrite and pyrrhotite). The recovery rate is low, the reagent consumption is large, the control is difficult, and the resource recycling effect cannot be achieved.

[0004] Based on the above problems, the utility model aims to provide a recovery system for complex gold-containing pyrite in polymetallic flotation tailings with high recovery rate, low reagent consumption and easy control. Utility Model Content

[0005] In view of the above problems, the utility model provides a system for recovering complex gold-containing pyrite in multi-metal flotation tailings.

[0006] The specific technical scheme is: a complex gold-containing pyrite recovery system in multi-metal flotation tailings, comprising a 1# stirring barrel, the discharge port of the 1# stirring barrel is connected to the feed port of a rapid concentrator, the discharge port of the rapid concentrator is sequentially connected to a primary rough flotation machine, a secondary rough flotation machine and a tertiary rough flotation machine, the tailings discharge port of the tertiary rough flotation machine is connected to the feed port of a pump pool, the discharge port of the pump pool is connected to the feed port of a pulse high gradient magnetic separator through a slurry pump, the concentrate discharge ports of the primary rough flotation machine, the secondary rough flotation machine and the tertiary rough flotation machine are all connected to the feed port of a 2# stirring barrel, the concentrate discharge port of the pulse high gradient magnetic separator is connected to the feed port of a 3# stirring barrel, and the discharge ports of the 2# stirring barrel and the 3# stirring barrel are sequentially connected to a first refinement flotation machine and a second refinement flotation machine.

[0007] Further, preferably, the tailings discharge port of the first refinement flotation machine is also connected to the feed port of the first roughing flotation machine.

[0008] Further, preferably, the tailings discharge port of the second refinement flotation machine is also connected to the feed port of the first refinement flotation machine.

[0009] The beneficial effects of the utility model are as follows: the utility model aims at the technical problem that the existing system has poor recovery effect on complex gold-containing pyrite in multi-metal flotation tailings. First, 30% to 40% of high-grade gold-containing pyrite concentrate is quickly floated out by a fast concentrator, so that the easy-to-float pyrite concentrate is avoided to be constantly reciprocated in the concentrating and roughing stages, thereby improving the flotation efficiency; then, the tailings are sequentially entered into the multi-stage rough flotation tank according to the difference in floatability, so that the medium ore is avoided to be constantly reciprocated, the scavenging process is simplified, and the controllability of the roughing is improved; and for the pyrrhotite that is difficult to float, the pulse high-gradient magnetic separator is used for magnetic separation, so that the recovery rate of the pyrrhotite is effectively improved; finally, after the multi-stage rough flotation concentrate and the pulse high-gradient magnetic separation concentrate are activated and slurried, they are concentrated into the two-stage fine flotation tank for selection. Since the grade of the ore is greatly improved by the front-stage multi-stage rough flotation and the pulse high-gradient magnetic separation, the dosage of the activation agent and the fine flotation agent is greatly reduced, and the grade of the concentrate obtained by the selection is higher. Compared with the existing system, the utility model greatly improves the recovery rate of valuable elements in gold-containing pyrite, reduces the reagent consumption and the difficulty of operation, significantly improves the economic indicators of flotation technology, has a good comprehensive resource recovery and utilization effect, and can effectively reduce the potential environmental pollution risk. The stability of its recovery results also proves that it has strong adaptability to fluctuations in ore properties in production, and has broad industrial promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is an equipment association diagram of a complex gold-containing pyrite recovery system in a multi-metal flotation tailings of the utility model;

[0011] Figure 2 It is an equipment association diagram of the complex gold-bearing pyrite recovery system in the existing polymetallic flotation tailings;

[0012] In the figure: 1-1# mixing barrel, 2-fast concentrator, 3-first-stage roughing flotation machine, 4-second-stage roughing flotation machine, 5-third-stage roughing flotation machine, 6-2# mixing barrel, 7-pump pool, 8-slurry pump, 9-pulse high gradient magnetic separator, 10-3# mixing barrel, 11-first-stage flotation machine, 12-second-stage flotation machine, 13-sulfur roughing tank, 14-first-stage sweeping tank, 15-second-stage sweeping tank. DETAILED DESCRIPTION

[0013] In order to make the technical problems and technical solutions solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0014] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0015] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] Example

[0017] like Figure 1As shown, the present application provides a system for recovering complex gold-containing pyrite in multi-metal flotation tailings, comprising a 1# stirring barrel 1, the discharge port of the 1# stirring barrel 1 is connected to the feed port of a rapid concentrator 2, the discharge port of the rapid concentrator 2 is sequentially connected to a primary rough flotation machine 3, a secondary rough flotation machine 4 and a tertiary rough flotation machine 5, the tailings discharge port of the tertiary rough flotation machine 5 is connected to the feed port of a pump pool 7, the discharge port of the pump pool 7 is connected to the feed port of a pulse high gradient magnetic separator 9 through a slurry pump 8, the concentrate discharge ports of the primary rough flotation machine 3, the secondary rough flotation machine 4 and the tertiary rough flotation machine 5 are all connected to the feed port of a 2# stirring barrel 6, the concentrate discharge port of the pulse high gradient magnetic separator 9 is connected to the feed port of a 3# stirring barrel 10, and the discharge ports of the 2# stirring barrel 6 and the 3# stirring barrel 10 are sequentially connected to a first refinement flotation machine 11 and a second refinement flotation machine 12. At the same time, the tailings discharge port of the first flotation machine 11 is also connected to the feed port of the first rougher flotation machine 3 to achieve the circulation treatment of the first flotation tailings; the tailings discharge port of the second flotation machine 12 is also connected to the feed port of the first flotation machine 11 to achieve the circulation treatment of the second flotation tailings.

[0018] Working principle: Add the raw materials to be processed into the 1# mixing barrel, and add concentrated sulfuric acid to adjust the slurry. After slurry adjustment, it is transported to the rapid concentrator 2 for rapid concentrating to obtain gold-containing sulfur concentrate I and rapid concentrating tailings.

[0019] The quick selection tailings are sequentially conveyed to the primary rough flotation machine 3, the secondary rough flotation machine 4 and the tertiary rough flotation machine 5 for primary rough flotation, secondary rough flotation and tertiary rough flotation respectively to obtain rough flotation concentrate and rough flotation tailings.

[0020] The rough flotation tailings are transported to the pump pool 7 and then transported to the pulse high gradient magnetic separator 9 through the slurry pump 8 for pyrrhotite recovery to obtain the magnetically separated rough concentrate and magnetically separated tailings.

[0021] The coarse flotation concentrate is transported to the 2# stirring barrel 6, and sodium hexametaphosphate and sodium sulfide are added for sulfidation and slurry adjustment to obtain a high-concentration slurry M; the magnetic separation coarse concentrate is transported to the 3# stirring barrel 10, copper sulfate is added and stirred for 3 minutes, and then butyl xanthate or isobutyl xanthate is added and stirred for 3 minutes to obtain a high-concentration slurry N;

[0022] After diluting the high-concentration slurry M and the high-concentration slurry N to a concentration of 15% to 25%, they are sequentially conveyed to the first refinement flotation machine 11 and the second refinement flotation machine 12 for two concentrations to obtain gold-containing sulfur concentrate II and concentrated tailings, wherein the tailings of the first refinement flotation machine 11 are returned to the primary roughing flotation machine 3 for recycling treatment, and the tailings of the second refinement flotation machine 12 are sequentially returned to the first refinement flotation machine 11 for recycling treatment; the gold-containing sulfur concentrate I finally obtained is combined with the gold-containing sulfur concentrate II to obtain the total gold-containing sulfur concentrate.

[0023] Application Example 1

[0024] Raw material 1#: a gold-containing copper flotation tailing, the main elements and their contents are: Au 0.64%, Ag 7.83%, S 7.54%, Fe 8.68%, the sulfide minerals are mainly pyrite, marcasite, arsenopyrite, pyrrhotite, and there are very few chalcopyrite, galena, sphalerite; the gangue minerals are mainly feldspar, quartz and calcite, and a small amount of mica.

[0025] The gold-containing copper flotation tailings are recovered by using the recovery system of the present application, and the specific treatment process is as follows:

[0026] (1) Rapid selection of raw materials to be processed: adding the raw materials to be processed into a 1# mixing barrel 1, adding concentrated sulfuric acid to prepare the slurry, and then conveying the prepared slurry to a rapid selection machine 2 for rapid selection. During flotation, adding a collector butyl xanthate and a frother 2# oil to obtain a gold-containing sulfur concentrate I and a rapid selection tailings;

[0027] (2) Gradient multi-stage rough flotation: The quick selection tailings are transported to the first-stage rough flotation machine 3 for first-stage rough flotation to obtain a rough concentrate A and a first-stage rough flotation tailings; the first-stage rough flotation tailings are transported to the second-stage rough flotation machine 4 for second-stage rough flotation to obtain a rough concentrate B and a second-stage rough flotation tailings; the second-stage rough flotation tailings are transported to the third-stage rough flotation machine 5 for third-stage rough flotation to obtain a rough concentrate C and a third-stage rough flotation tailings; the collector butyl xanthate and the frother 2# oil are added during flotation.

[0028] (3) Pulse high gradient magnetic separation: The tertiary rough flotation tailings are transported to a pulse high gradient magnetic separator 9 for pyrrhotite recovery. The magnetic induction intensity of the pulse high gradient magnetic separator is 50 mT to 300 mT, the stroke is 10 mm to 20 mm, the stroke frequency is 100 times / min to 300 times / min, and the magnetic medium diameter is 3 mm to 6 mm, to obtain magnetically separated rough concentrate and magnetically separated tailings;

[0029] (4) High-concentration activation of flotation rough concentrate: The rough concentrates A, B, and C obtained in step (2) are transported to the 2# stirring barrel 6, and sodium hexametaphosphate and sodium sulfide are added for sulfidation and slurry adjustment to obtain a high-concentration slurry M;

[0030] (5) High-concentration slurry preparation of the magnetically separated coarse concentrate: the magnetically separated coarse concentrate obtained in step (3) is transported to the 3# stirring barrel 10, copper sulfate is added and stirred for 3 minutes, and butyl xanthate is added and stirred for 3 minutes to obtain a high-concentration slurry N;

[0031] (6) Concentrated concentration and quality improvement of gold-bearing pyrite: The high-concentration slurry M obtained in step (4) and the high-concentration slurry N obtained in step (5) are diluted to a concentration of 15% to 25%, and then transported to the first refinement flotation machine 11 and the second refinement flotation machine 12 for two refinements to obtain gold-bearing sulfur concentrate II and selected tailings, wherein the tailings of the first refinement flotation machine 11 are returned to the primary roughing flotation machine 3 for recycling treatment, and the tailings of the second refinement flotation machine 12 are sequentially returned to the first refinement flotation machine 11 for recycling treatment; the gold-bearing sulfur concentrate I finally obtained is combined with the gold-bearing sulfur concentrate II to obtain the total gold-bearing sulfur concentrate.

[0032] The utility model is adopted to implement the gold-containing copper flotation tailings, and the test results are as follows: the grade of the gold-containing pyrite concentrate is Au4.11g / t, Ag36.36g / t, S47.86%, Fe44.18%, and the recovery rate is Au67.54%, Ag65.82%, S91.56%, Fe86.57%.

[0033] Application Example 2

[0034] Raw material 2#: a flotation tailing containing gold, copper, lead and zinc. The main elements and their contents are: Au 0.52g / t, Ag 8.65g / t, S 8.66%, Fe 7.93%. The sulfide minerals are mainly pyrite, marcasite, arsenopyrite, pyrrhotite, and very little chalcopyrite, galena and sphalerite. The gangue minerals are mainly feldspar, quartz and calcite, and a small amount of mica.

[0035] The processing process described in Example 1 was adopted to recycle the raw material 2#, and the test results were as follows: the grade of the gold-containing pyrite concentrate was Au 3.46 g / t, Ag 29.78 g / t, S 48.28%, Fe 44.39%, and the recovery rate was Au 69.53%, Ag 71.18%, S 91.87%, Fe 87.19%.

[0036] Application Example 3

[0037] Raw material 3#: a flotation tailing containing gold, copper, lead and zinc. The main elements and their contents are: Au 0.48g / t, Ag 9.15g / t, S 9.37%, Fe 9.77%, the sulfide minerals are mainly pyrite, marcasite, arsenopyrite, pyrrhotite, and there are very few chalcopyrite, galena and sphalerite; the gangue minerals are mainly feldspar, quartz and calcite, and a small amount of mica.

[0038] The processing process described in Example 1 was used to recover raw material 3#, and the test results were as follows: the grade of the gold-containing pyrite concentrate was Au 3.19g / t, Ag 37.27 / t, S 49.86%, Fe 44.62%, and the recovery rates were Au 73.38%, Ag 71.65%, S 92.63%, and Fe 85.39%.

[0039] Application Example 4

[0040] Raw material 4#: a gold-containing copper flotation tailings, the main elements and their contents are: Au 0.75%, Ag 10.33%, S 8.79%, Fe 8.72%, the sulfide minerals are mainly pyrite, marcasite, arsenopyrite, pyrrhotite, and there are very few chalcopyrite, galena, sphalerite; the gangue minerals are mainly feldspar, quartz and calcite, and a small amount of mica.

[0041] The processing process described in Example 1 was used to recover raw material 4#, and the test results were as follows: the grade of the gold-containing pyrite concentrate was Au 4.78g / t, Ag 41.65g / t, S 48.91%, Fe 44.05%, and the recovery rates were Au 75.48%, Ag 70.39%, S 92.16%, and Fe 86.46%.

[0042] In order to further verify the effect of the recovery system of the utility model, the existing recovery system is used to implement the above raw materials 1# to raw materials 4#, wherein the reagent consumption during the implementation process is shown in Table 1, and the recovery of valuable elements is shown in Table 2.

[0043] Table 1: Comparative data of reagent consumption of two recovery systems

[0044]

[0045] Table 2: Comparative data of valuable element recovery of two recovery systems

[0046]

[0047] In summary, the utility model is used to recycle this type of multi-metal flotation tailings to obtain gold-containing pyrite concentrate with a grade of Au 3g / t or more, Ag 35g / t or more, S 48% or more, and Fe 44% or more, and the recovery rate is about Au 70%, Ag 70%, S 91%, and Fe 86%. Compared with the existing recovery method, the utility model greatly improves the recovery rate of valuable elements in gold-containing pyrite, reduces the consumption of reagents and the difficulty of control, and the economic indicators of flotation technology are significantly improved. The comprehensive recycling and utilization of resources is good, and the potential environmental pollution risk can be effectively reduced. The utility model has stable recovery results for multiple different raw materials, and it also proves that it has strong adaptability to fluctuations in ore properties during production, and has a wide range of industrial promotion and application value.

[0048] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for recovering complex gold-containing pyrite in polymetallic flotation tailings, comprising a 1# stirring barrel (1), characterized in that: The discharge port of the 1# mixing barrel (1) is connected to the feed port of the rapid concentrator (2), the discharge port of the rapid concentrator (2) is connected to the first-stage rough flotation machine (3), the second-stage rough flotation machine (4) and the third-stage rough flotation machine (5) in sequence, the tailings discharge port of the third-stage rough flotation machine (5) is connected to the feed port of the pump pool (7), the discharge port of the pump pool (7) is connected to the feed port of the pulse high gradient magnetic separator (9) through a slurry pump (8), the concentrate discharge ports of the first-stage rough flotation machine (3), the second-stage rough flotation machine (4) and the third-stage rough flotation machine (5) are all connected to the feed port of the 2# mixing barrel (6), the concentrate discharge port of the pulse high gradient magnetic separator (9) is connected to the feed port of the 3# mixing barrel (10), and the discharge ports of the 2# mixing barrel (6) and the 3# mixing barrel (10) are connected to the first concentrate flotation machine (11) and the second concentrate flotation machine (12) in sequence.

2. A system for recovering complex gold-containing pyrite in multi-metal flotation tailings according to claim 1, characterized in that: The tailings discharge port of the first refinement flotation machine (11) is also connected to the feed port of the first roughing flotation machine (3).

3. The system for recovering complex gold-containing pyrite in multi-metal flotation tailings according to claim 1, characterized in that: The tailings discharge port of the second refinement flotation machine (12) is also connected to the feed port of the first refinement flotation machine (11).

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