Pretreatment and leaching system for high-sulfur micro-fine particle disseminated gold concentrate

Abstract

The utility model discloses a pretreatment and leaching system for high-sulfur micro-fine particle disseminated gold concentrate, which is characterized in that an ore grinding product outlet of a vertical ball mill is connected with a feed port of a first stirring tank, and an overflow port of the first stirring tank is connected with a feed port of a grading cyclone; an underflow port of the grading cyclone is connected with a feed port of the second stirring tank; an overflow port of the second stirring tank is connected with a feed port of the vertical ball mill; an overflow product outlet of the grading cyclone is connected with a feed port of the oxidation pretreatment tank, and an overflow port of the oxidation pretreatment tank is connected with a feed port of the filter press; a filter cake discharging end of the filter press is connected with a feeding hole of the fourth stirring tank through a belt conveyor; an overflow port of the fourth stirring tank is connected with a feeding port of the leaching tank; a filtrate outlet of the filter press is connected with a feeding hole of the second stirring tank. Fine grinding, oxygen-enriched oxidation pretreatment, dehydration pretreatment and oxygen-enriched oxidation leaching of the high-sulfur micro-fine particle disseminated gold concentrate are achieved, and the recovery rate of gold can be effectively increased.

Description

Technical Field

[0001] The utility model relates to a gold concentrate dressing system, which is mainly used for processing high-sulfur fine-grained gold concentrate. Background Art

[0002] For gold ores where the gold-bearing mineral is mainly pyrite and the gold mineral is finely embedded, the flotation target mineral is pyrite, and the obtained flotation concentrate product (gold concentrate) is mainly composed of pyrite, and the gold mineral is mainly paragenetic with pyrite. Since the gold in the gold concentrate is finely embedded, its main mineral is pyrite, and pyrite contains sulfur, this kind of gold concentrate is often called high-sulfur fine-grained gold concentrate.

[0003] For high-sulfur fine-grained gold ore, the key is to destroy the "encapsulation" and make the gold minerals "exposed" so that they can "fully contact" with the reagents and dissolve during the leaching process. Conventional grinding cannot fully "expose" the gold minerals in high-sulfur fine-grained gold ore, making it difficult to obtain ideal leaching indicators.

[0004] On the other hand, oxygen plays an extremely important role in the cyanide gold extraction process. Increasing the content of dissolved oxygen in the cyanide slurry can significantly speed up the leaching speed of gold and improve the leaching rate of gold. In the prior art, due to the high body of the leaching tank, the slurry circulation effect is poor, and the dissolved oxygen in the bottom slurry is low, which affects the gold leaching rate. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a pretreatment and leaching system for high-sulfur fine-grained gold concentrate, solve the problem of low gold leaching rate in conventional cyanide leaching of high-sulfur fine-grained gold concentrate, and further effectively improve the gold recovery rate.

[0006] The technical solution of the utility model is as follows:

[0007] A pretreatment and leaching system for high-sulfur fine-grained gold concentrate, comprising a grading cyclone, a filter press, a leaching tank with a stirring function, and a first stirring tank, a second stirring tank, a third stirring tank and a fourth stirring tank respectively having a feed port and an overflow port, the system further comprising a vertical ball mill with a feed port and a grinding product outlet and an oxidation pretreatment tank with a stirring function; the grinding product outlet of the vertical ball mill is connected to the feed port of the first stirring tank through a chute, and the overflow port of the first stirring tank is connected to the feed port of the grading cyclone through a pump tank and a slurry pump; the grading cyclone The underflow port of the device is connected to the feed port of the second stirring tank through a pipeline, and the overflow port of the second stirring tank is connected to the feed port of the vertical ball mill through a pump tank and a slurry pump; the overflow product outlet of the grading cyclone is connected to the feed port of the oxidation pretreatment tank through a pipeline, and the overflow port of the oxidation pretreatment tank is connected to the feed port of the filter press through a pump tank and a slurry pump; the filter cake discharge end of the filter press is connected to the feed port of the fourth stirring tank through a belt conveyor; the overflow port of the fourth stirring tank is connected to the feed port of the leaching tank through a pump tank and a slurry pump; the filtrate outlet of the filter press is connected to the feed port of the second stirring tank through a pipeline.

[0008] Preferably, the system further comprises an oxygen storage tank, and the oxygen storage tank is respectively connected to the oxidation pretreatment tank and the leaching tank through pipelines.

[0009] Preferably, the grinding product outlet position of the vertical ball mill is higher than the feed inlet position of the first stirring tank; the overflow port position of the first stirring tank is higher than the feed inlet position of the pump tank connected to the overflow port.

[0010] Preferably, the overflow product outlet position of the grading cyclone is higher than the feed inlet position of the oxidation pretreatment tank; the underflow product outlet position of the grading cyclone is higher than the feed inlet position of the second stirring tank.

[0011] Preferably, the overflow port of the oxidation pretreatment tank is located higher than the feed port of the third stirring tank.

[0012] Preferably, the overflow port of the third stirring tank is located higher than the feed port of the pump tank to which the overflow port is connected.

[0013] Preferably, the filtrate port of the filter press is located higher than the feed port of the pump tank to which the filtrate port is connected.

[0014] Preferably, the overflow port of the fourth stirring tank is located higher than the feed port of the pump tank to which the overflow port is connected.

[0015] The positive effects of the utility model are:

[0016] First, the utility model effectively improves the recovery rate of gold through ultrafine grinding, oxygen-enriched oxidation pretreatment, dehydration pretreatment and oxygen-enriched oxidation leaching. The utility model uses a vertical ball mill to perform closed-circuit ultrafine grinding on high-sulfur fine-grained gold concentrate. The use of a vertical ball mill can refine the mineral particles, produce changes such as lattice defects and lattice distortion, and have higher reactivity. In addition to being able to open the "package" of gold, it can also allow the original harsh reaction conditions to be carried out under relatively mild conditions. Specifically, through the vertical ball mill grinding, the fine-grained gold particles in the gold concentrate are fully dissociated or exposed. After ultrafine grinding, pyrite (sulfur) can be oxidized at room temperature and pressure. The iron element reacts with hydroxide to generate iron hydroxide that does not react with cyanide. At the same time, the sulfur element generates sulfate. In the subsequent cyanide leaching process, cyanide is no longer consumed to generate thiocyanate, thereby reducing the consumption of cyanide. Moreover, after oxidation treatment, the wrapped gold can be further exposed to contact with the leaching agent, thereby improving the gold leaching rate to a certain extent.

[0017] Second, for gold minerals with high oxygen consumption such as high-grade gold concentrate, the utility model performs oxygen-enriched leaching by introducing oxygen into the bottom of the leaching tank and the bottom of the pretreatment tank, thereby increasing the content of dissolved oxygen in the cyanide slurry, further accelerating the leaching speed of gold, and improving the leaching rate of gold. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0019] In the figure, 1, vertical ball mill, 2-1, first stirring tank, 2-2, second stirring tank, 2-3, third stirring tank, 2-4, fourth stirring tank, 3-1, first pump tank, 3-2, second pump tank, 3-3, third pump tank, 3-4, fourth pump tank, 4-1, first slurry pump, 4-2, second slurry pump, 4-3, third slurry pump, 4-4, fourth slurry pump, 5, classifying cyclone, 6, oxidation pretreatment tank, 7, filter press, 8, belt conveyor, 9, leaching tank, 10, oxygen storage tank. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] An embodiment of the pretreatment and leaching system of the utility model comprises a vertical ball mill 1 with a feed inlet and a grinding product outlet, a grading cyclone 5 with a feed inlet, an underflow outlet and an overflow product outlet, an oxidation pretreatment tank 6 with a stirring function, a filter press 7 with a feed inlet, a filter cake discharge end and a filtrate outlet, a belt conveyor 8, a leaching tank 9 with a stirring function, a first stirring tank 2-1, a second stirring tank 2-2, a third stirring tank 2-3 and a fourth stirring tank 2-4 with a feed inlet and an overflow outlet respectively, a first pump tank 3-1, a second pump tank 3-2, a third pump tank 3-3, a fourth pump tank 3-4, a first slurry pump 4-1, a second slurry pump 4-2, a third slurry pump 4-3 and a fourth slurry pump 4-4.

[0022] The grinding product outlet of the vertical ball mill 1 is connected to the feed inlet of the first stirring tank 2-1 through a chute, the overflow of the first stirring tank 2-1 is connected to the feed inlet of the first pump tank 3-1 through a pipeline, the outlet of the first pump tank 3-1 is connected to the feed inlet of the first slurry pump 4-1 through a pipeline, and the discharge port of the first slurry pump 4-1 is connected to the feed inlet of the grading cyclone 5 through a pipeline. The underflow port of the grading cyclone 5 is connected to the feed inlet of the second stirring tank 2-2 through a pipeline, the overflow of the second stirring tank 2-2 is connected to the feed inlet of the second pump tank 3-2 through a pipeline, the outlet of the second pump tank 3-2 is connected to the feed inlet of the second slurry pump 4-2 through a pipeline, and the discharge port of the second slurry pump 4-2 is connected to the feed inlet of the vertical ball mill 1 through a pipeline.

[0023] The overflow product outlet of the grading cyclone 5 is connected to the feed port of the oxidation pretreatment tank 6 through a pipeline, the overflow port of the oxidation pretreatment tank 6 is connected to the third stirring tank 2-3 through a pipeline, the outlet of the third stirring tank 2-3 is connected to the feed port of the third pump tank 3-3 through a pipeline, the outlet of the third pump tank 3-3 is connected to the feed port of the third slurry pump 4-3 through a pipeline, and the outlet of the third slurry pump 4-3 is connected to the feed port of the filter press 7 through a pipeline.

[0024] The filter cake discharge end of the filter press 7 is connected to the feed port of the fourth stirring tank 2-4 through the belt conveyor 8. The filter cake is unloaded on the belt conveyor 8 and then transported to the top of the feed port of the fourth stirring tank 2-4, and falls into the fourth stirring tank 2-4. The overflow port of the fourth stirring tank 2-4 is connected to the feed port of the fourth pump tank 3-4 through a pipeline. The outlet of the fourth pump tank 3-4 is connected to the feed port of the fourth slurry pump 4-4 through a pipeline, and the outlet of the fourth slurry pump 4-4 is connected to the feed port of the leaching tank 9 through a pipeline. The filtrate outlet of the filter press 7 is connected to the feed port of the second stirring tank 2-2 through a pipeline.

[0025] This embodiment further includes an oxygen storage tank 10, which is connected to the bottom of the oxidation pretreatment tank 6 and the bottom of the leaching tank 9 through pipelines.

[0026] Further, in order to realize the slurry self-flow, the grinding product outlet position of the vertical ball mill 1 is higher than the feed port position of the first stirring tank 2-1. The overflow port position of the first stirring tank 2-1 is higher than the feed port position of the first pump tank 3-1. The overflow product outlet position of the grading cyclone 5 is higher than the feed port position of the oxidation pretreatment tank 6. The underflow product outlet position of the grading cyclone 5 is higher than the feed port position of the second stirring tank 2-2. The overflow port position of the oxidation pretreatment tank 6 is higher than the feed port position of the third stirring tank 2-3. The overflow port position of the third stirring tank 2-3 is higher than the feed port position of the third pump tank 3-3. The overflow port position of the fourth stirring tank 2-4 is higher than the feed port position of the fourth pump tank 3-4. The filtrate outlet position of the filter press 7 is higher than the feed port position of the second stirring tank 2-2.

[0027] The following examples illustrate the workflow of the present utility model.

[0028] The high-sulfur fine-grained gold concentrate (material to be ground) enters the second stirring tank 2-2, and after slurry adjustment with the bottom flow of the classification cyclone 5 and the filtrate water of the filter press 7, it flows by gravity into the second pump tank 3-2 from the overflow port, and then is pumped into the vertical ball mill 1 for grinding by the second slurry pump 4-2. The grinding product flows by gravity into the first stirring tank 2-1 for stirring and slurry adjustment. The overflow of the first stirring tank 2-1 flows by gravity into the first pump tank 3-1, and then is pumped into the classification cyclone 5 by the first slurry pump 4-1 for classification.

[0029] The bottom flow of the grading cyclone 5 flows by gravity into the second stirring tank 2-2 to be slurried together with the high-sulfur fine-grained gold concentrate. The overflow of the grading cyclone 5 flows by gravity into the oxidation pretreatment tank 6 for oxidation pretreatment. After oxidation pretreatment, the slurry flows by gravity into the third stirring tank 2-3, and then flows by gravity into the third pump tank 3-3 from the overflow port, and then is pumped into the filter press 7 by the third slurry pump 4-3 for filtration and dehydration. The filter cake is sent to the fourth stirring tank 2-4 by the belt conveyor 8 for stirring and slurry mixing. The overflow of the fourth stirring tank 2-4 flows by gravity into the fourth pump tank 3-4, and then is pumped into the leaching tank 9 by the fourth slurry pump 4-4 for cyanide leaching. The filtrate of the filter press 7 flows by gravity into the second stirring tank 2-2 as slurry mixing water. The oxygen storage tank 10 oxygenates the bottom of the oxidation pretreatment tank 6 and the bottom of the leaching tank 9 through the pipeline.

Claims

1. A pretreatment and leaching system for high-sulfur fine-grained gold concentrate, comprising a classifying cyclone (5), a filter press (7), a leaching tank (9) with a stirring function, and a first stirring tank (2-1), a second stirring tank (2-2), a third stirring tank (2-3) and a fourth stirring tank (2-4) each having a feed port and an overflow port, characterized in that: The system further comprises a vertical ball mill (1) having a feed inlet and a grinding product outlet and an oxidation pretreatment tank (6) having a stirring function; the grinding product outlet of the vertical ball mill (1) is connected to the feed inlet of a first stirring tank (2-1) via a chute, and the overflow outlet of the first stirring tank (2-1) is connected to the feed inlet of a grading cyclone (5) via a pump tank and a slurry pump; the underflow outlet of the grading cyclone (5) is connected to the feed inlet of a second stirring tank (2-2) via a pipeline, and the overflow outlet of the second stirring tank (2-2) is connected to the feed inlet of the vertical ball mill ( 1); the overflow product outlet of the grading cyclone (5) is connected to the feed inlet of the oxidation pretreatment tank (6) through a pipeline, and the overflow outlet of the oxidation pretreatment tank (6) is connected to the feed inlet of the filter press (7) through a pump tank and a slurry pump; the filter cake discharge end of the filter press (7) is connected to the feed inlet of the fourth stirring tank (2-4) through a belt conveyor (8); the overflow outlet of the fourth stirring tank (2-4) is connected to the feed inlet of the leaching tank (9) through a pump tank and a slurry pump; the filtrate outlet of the filter press (7) is connected to the feed inlet of the second stirring tank (2-2) through a pipeline.

2. The pretreatment and leaching system for high-sulfur fine-grained gold concentrate according to claim 1 is characterized by: The system further comprises an oxygen storage tank (10), wherein the oxygen storage tank (10) is respectively connected to the oxidation pretreatment tank (6) and the leaching tank (9) through pipelines.

3. The pretreatment and leaching system for high-sulfur fine-grained gold concentrate according to claim 1 or 2, characterized in that: The grinding product outlet position of the vertical ball mill (1) is higher than the feed inlet position of the first stirring tank (2-1); and the overflow port position of the first stirring tank (2-1) is higher than the feed inlet position of the pump tank connected to the overflow port.

4. The pretreatment and leaching system for high-sulfur fine-grained gold concentrate according to claim 1 or 2, characterized in that: The overflow product outlet position of the classification cyclone (5) is higher than the feed inlet position of the oxidation pretreatment tank (6); and the underflow product outlet position of the classification cyclone (5) is higher than the feed inlet position of the second stirring tank (2-2).

5. The pretreatment and leaching system for high-sulfur fine-grained gold concentrate according to claim 1 or 2, characterized in that: The overflow port of the oxidation pretreatment tank (6) is located at a position higher than the feed port of the third stirring tank (2-3).

6. The pretreatment and leaching system for high-sulfur fine-grained gold concentrate according to claim 1 or 2, characterized in that: The overflow port of the third stirring tank (2-3) is located higher than the feed port of the pump tank to which the overflow port is connected.

7. The pretreatment and leaching system for high-sulfur fine-grained gold concentrate according to claim 1 or 2, characterized in that: The position of the filtrate outlet of the filter press (7) is higher than the position of the feed inlet of the pump tank to which the filtrate outlet is connected.

8. The pretreatment and leaching system for high-sulfur fine-grained gold concentrate according to claim 1 or 2, characterized in that: The overflow port of the fourth stirring tank (2-4) is located higher than the feed port of the pump tank to which the overflow port is connected.

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