System for secondary recovery of gold from arsenic-containing and carbon-containing cyanidation tailings

Abstract

The utility model discloses a system for secondary recovery of gold from arsenic-containing and carbon-containing cyanidation tailings. The system comprises a scattering dryer, a rotary kiln, a stirring tank, a filter press, an ore pulp pump, a flotation column and a leaching tank. The cyanidation tailings are firstly fed into a drying beater to be dried and scattered, the powdery cyanidation tailings are fed into a rotary kiln to be roasted, the cinder is fed into an acid leaching stirring tank to be subjected to water quenching and acid leaching, ore pulp obtained after acid leaching is fed into a filter press to be subjected to filter pressing dehydration, and filtrate is converged into an acidification water return pool to be stored and recycled. A filter cake is fed into a stirring tank for size mixing and dosing before selection, a collecting agent is usually prepared from butyl xanthate and ammonium dibutyl dithiophosphate in a combined manner, and a foaming agent is 2 # oil; the slag is fed into a flotation process after being subjected to size mixing and chemical adding, the flotation process comprises one-time roughing and one-time concentration, finally concentrated concentrate is subjected to filter pressing and dewatering and then serves as a final product to be sold to a pyrometallurgy enterprise, and roughing tailings enter a cyaniding leaching process. The leaching pregnant solution is subjected to a subsequent replacement and recovery process, and the secondary cyanidation tailings are discharged into a tailings pond for stockpiling after being subjected to washing and filter pressing.

Description

Technical Field

[0001] The utility model relates to a smelting system, which is mainly used for treating arsenic-containing and carbon-containing cyanide tailings and secondarily recovering gold in the cyanide tailings. Background Art

[0002] With the large-scale mining of gold mines, easy-to-process gold resources are becoming increasingly exhausted, and difficult-to-process gold mines will become the main resources of the gold industry in the future. Among the proven gold reserves in my country, 30% are difficult-to-process gold mines, among which arsenic-containing and carbon-containing gold mines are the most difficult to process and have become an important resource for my country's future gold development and utilization.

[0003] The difficulty in treating arsenic-containing and carbon-containing gold ores lies in the close coexistence of gold minerals with arsenic-containing minerals (mainly arsenopyrite) and pyrite. Gold is distributed in fine particles, or is wrapped in arsenopyrite and pyrite, or exists between their individual crystals. Due to the use of conventional cyanidation gold extraction process, the gold leaching rate is low. In addition, during cyanidation leaching of gold, the carbon-containing matrix can adsorb gold complexes, resulting in a "gold robbing" effect, resulting in the gold grade of the cyanide tailings of this type of gold concentrate being generally above 5g / t, and some are even as high as about 10g / t, which still has great recovery value.

[0004] Although the gold grade in the arsenic- and carbon-containing cyanide tailings is relatively high, the gold is basically in a completely wrapped state. Conventional cyanide leaching can no longer recover this part of gold. Considering production costs and other reasons, this part of the cyanide tailings is usually directly discharged into the tailings pond for storage, which not only causes waste of resources but also causes environmental pollution problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a system for secondary recovery of gold from arsenic-containing and carbon-containing cyanidation tailings, which is used for secondary recovery of gold in the cyanidation tailings of this type and realizes reduction and resource utilization of the cyanidation tailings.

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

[0007] A system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings, comprising a dispersing dryer and a rotary kiln connected to each other by a conveyor belt, an acid leaching stirring tank with a feed inlet and a pulp outlet, a pre-selection stirring tank and a pre-leaching stirring tank, a first filter press and a second filter press with a feed inlet, a filtrate outlet and a filter cake outlet, a roughing flotation column with a feed inlet, a roughing foam outlet and a flotation tailings outlet, and a concentrating flotation column with a feed inlet, a concentrating foam outlet and a discharge outlet, and also comprising a leaching stirring tank, wherein the slag outlet of the rotary kiln is connected to the feed inlet of the acid leaching stirring tank through an inclined slot, the pulp outlet of the acid leaching stirring tank is connected to the feed inlet of the first filter press, and the filter outlet of the first filter press is connected to the filter outlet of the first filter press. The liquid outlet is connected to the feed port of the acid leaching stirring tank; the filter cake outlet of the first filter press is connected to the feed port of the pre-selection stirring tank through the conveyor belt, the slurry outlet of the pre-selection stirring tank is connected to the feed port of the roughing flotation column, the flotation tailings outlet of the roughing flotation column is connected to the feed port of the pre-leaching stirring tank, and the slurry outlet of the pre-leaching stirring tank is connected to the leaching stirring tank; the roughing foam outlet of the roughing flotation column is connected to the feed port of the fine flotation column through a pipeline, and the discharge port of the fine flotation column is connected to the feed port of the roughing flotation column; the fine foam outlet of the fine flotation column is connected to the feed port of the second filter press; the filtrate outlet of the second filter press is connected to the feed port of the roughing flotation column.

[0008] Preferably, the slurry outlet of the acid leaching stirring tank is connected to a first pump pool through a pipeline, and the discharge port of the first pump pool is connected to the feed port of the first filter press through a pipeline installed with a first slurry pump.

[0009] Preferably, the filtrate outlet of the first filter press is connected to a second pump pool, and the discharge port of the second pump pool is connected to the feed port of the acid leaching stirring tank through a pipeline installed with a second slurry pump.

[0010] Preferably, the slurry outlet of the pre-selection stirring tank is connected to a third pump tank via a pipeline, and the third pump tank is connected to the feed port of the roughing flotation column via a pipeline equipped with a third slurry pump.

[0011] Preferably, the filtrate outlet of the second filter press is connected to a sixth pump pool via a pipeline, and the discharge port of the sixth pump pool is connected to the feed port of the third pump pool via a pipeline on which a sixth slurry pump is installed.

[0012] Preferably, the selected foam outlet of the selected flotation column is connected to a fourth pump pool via a pipeline, and the discharge port of the fourth pump pool is connected to the feed port of the second filter press via a pipeline installed with a fourth slurry pump.

[0013] Preferably, the slurry outlet of the pre-leaching stirring tank is connected to a fifth pump tank via a pipeline, and the discharge port of the fifth pump tank is connected to the leaching stirring tank via a pipeline installed with a fifth slurry pump.

[0014] Preferably, the discharge port of the selective flotation column is connected to the feed port of the roughing flotation column via a pipeline equipped with a seventh slurry pump.

[0015] Preferably, the flotation tailings outlet of the roughing flotation column is connected to the feed inlet of the pre-immersion stirring tank via a pipeline equipped with an eighth slurry pump.

[0016] Preferably, the roughing flotation column and the cleaning flotation column are both cyclonic static microbubble flotation columns.

[0017] The positive effects of the utility model are:

[0018] The system of the utility model implements treatment measures including roasting oxidation, acidification, flotation and cyanide leaching for arsenic-containing and carbon-containing cyanide tailings, and reasonably combines these measures to make them work synergistically. Roasting removes harmful elements arsenic and organic carbon in cyanide tailings, and partially dissociates and exposes the encapsulated gold minerals, keeping the sulfur content in the slag at 5-8%. Flotation uses a cyclone static microbubble flotation column suitable for the flotation of fine-grained minerals. The flotation concentrate has a high enrichment ratio, and high-grade gold-containing concentrate can be sold to pyrometallurgical enterprises. The flotation tailings are subjected to conventional cyanide leaching to recover gold, so that the gold in this type of cyanide tailings can be efficiently recovered. Compared with the process of recovering gold by cyanide leaching of all slag, the combined process of selling slag flotation concentrate and cyanide leaching of flotation tailings can increase the gold recovery rate by about 15%, with considerable economic benefits, and at the same time achieve a reduction of about 20% in cyanide tailings.

[0019] By using the system of the utility model for treatment, the encapsulated gold is dissociated and exposed to contact with the cyaniding agent. The slag after roasting and oxidation pretreatment of arsenic-containing and carbon-containing cyanidation tailings is loose and porous, and the encapsulated gold minerals can be partially dissociated and exposed, and part of the gold can be recovered by cyanidation leaching. Under the current high gold price conditions, the system using the combined technical measures of the utility model can recover gold from the secondary treatment of this type of cyanidation tailings, with huge potential economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0021] In the figure, 1, dispersing dryer, 2, rotary kiln, 3-1, acid leaching stirring tank, 3-2, pre-selection stirring tank, 3-3, pre-leaching stirring tank, 4-1, the first slurry pump, 4-2, the second slurry pump, 4-3, the third slurry pump, 4-4, the fourth slurry pump, 4-5, the fifth slurry pump, 4-6, the sixth slurry pump, 4-7, the seventh slurry pump, 4-8, the eighth slurry pump, 5-1, the first pump pool, 5-2, the second pump pool, 5-3, the third pump pool, 5-4, the fourth pump pool, 5-5, the fifth pump pool, 5-6, the sixth pump pool, 6-1 the first filter press, 6-2, the second filter press, 7-1, the roughing flotation column, 7-2, the fine flotation column, 8, the leaching stirring tank. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 The embodiment of the utility model comprises a dispersing dryer 1 and a leaching stirring tank 8. The dispersing dryer 1 is connected to a rotary kiln 2 via a conveyor belt, and the conveyor belt is used to convey the powdered cyanide tailings treated by the dispersing dryer 1 to the rotary kiln 2.

[0024] This embodiment also includes an acid leaching stirring tank 3-1, a pre-selection stirring tank 3-2 and a pre-leaching stirring tank 3-3, each having a feed port and a pulp outlet. The slag outlet of the rotary kiln 2 is connected to the feed port of the acid leaching stirring tank 3-1 through a chute.

[0025] The present embodiment further comprises a first filter press 6-1 and a second filter press 6-2 with a feed inlet, a filtrate outlet and a filter cake outlet, respectively. The present embodiment further comprises a first pump pool 5-1, a second pump pool 5-2, a third pump pool 5-3, a fourth pump pool 5-4, a fifth pump pool 5-5 and a sixth pump pool 5-6 with a feed inlet and a discharge outlet, respectively.

[0026] The slurry outlet of the acid leaching stirring tank 3-1 is connected to the feed port of the first pump tank 5-1 through a pipeline, the discharge port of the first pump tank 5-1 is connected to the feed port of the first filter press 6-1 through a pipeline installed with the first slurry pump 4-1, the filtrate outlet of the first filter press 6-1 is connected to the feed port of the second pump tank 5-2, and the discharge port of the second pump tank 5-2 is connected to the feed port of the acid leaching stirring tank 3-1 through a pipeline installed with the second slurry pump 4-2.

[0027] This embodiment also includes a roughing flotation column 7-1 with a feed port, a roughing froth outlet and a flotation tailings outlet, and a fine flotation column 7-2 with a feed port, a fine froth outlet and a discharge port. The filter cake outlet of the first filter press 6-1 is connected to the feed port of the pre-selection stirring tank 3-2 through a conveyor belt, and the conveyor belt is used to transport the filter cake discharged from the first filter press 6-1 to the pre-selection stirring tank 3-2. The slurry outlet of the pre-selection stirring tank 3-2 is connected to the third pump tank 5-3 through a pipeline, and the third pump tank 5-3 is connected to the feed port of the roughing flotation column 7-1 through a pipeline equipped with a third slurry pump 4-3.

[0028] The flotation tailings outlet of the roughing flotation column 7-1 is connected to the feed port of the pre-immersion stirring tank 3-3 through a pipeline installed with the eighth slurry pump 4-8, the slurry outlet of the pre-immersion stirring tank 3-3 is connected to the feed port of the fifth pump tank 5-5 through a pipeline, and the discharge port of the fifth pump tank 5-5 is connected to the leaching stirring tank 8 through a pipeline installed with the fifth slurry pump 4-5.

[0029] The roughing foam outlet of the roughing flotation column 7-1 is connected to the feed port of the fine flotation column 7-2 through a pipeline, and the discharge port of the fine flotation column 7-2 is connected to the feed port of the roughing flotation column 7-1 through a pipeline installed with the seventh slurry pump 4-7. The fine foam outlet of the fine flotation column 7-2 is connected to the feed port of the fourth pump pool 5-4 through a pipeline, and the discharge port of the fourth pump pool 5-4 is connected to the feed port of the second filter press 6-2 through a pipeline installed with the fourth slurry pump 4-4, and the filter cake discharged from the filter cake outlet of the second filter press 6-2 is used as a flotation concentrate product. The filtrate outlet of the second filter press 6-2 is connected to the feed port of the sixth pump pool 5-6 through a pipeline, and the discharge port of the sixth pump pool 5-6 is connected to the feed port of the third pump pool 5-3 through a pipeline installed with the sixth slurry pump 4-6.

[0030] The cyanide tailings are first fed into the disintegration dryer 1 for drying and disintegration, and the powdered cyanide tailings are fed into the rotary kiln 2 for roasting. The rotary kiln 2 needs to be equipped with a complete flue gas purification system and waste heat recovery system ( Figure 1The flue gas purification system and waste heat recovery system are omitted). The slag is fed into the acid leaching stirring tank 3-1 for water quenching and acidification treatment. The acid leaching time needs to be determined according to the material properties and through experiments. The acidified slurry is fed into the first filter press 6-1 by the first slurry pump 4-1 for pressure filtration and dehydration. The filtrate is collected into the second pump pool 5-2 for storage and circulation as acid leaching water, and then fed into the acid leaching stirring tank 3-1 by the second slurry pump 4-2. The filter cake is fed into the pre-selection stirring tank 3-2 for slurry mixing and dosing. The collector is usually a combination of butyl xanthate and butyl ammonium black medicine, and the foaming agent is 2# oil. After slurrying and adding chemicals, the slag is fed into the roughing flotation column 7-1 by the third slurry pump 4-3, the roughing foam flows into the fine flotation column 7-2 by gravity, the roughing tailings are fed into the pre-leaching stirring tank 3-3 by the eighth slurry pump 4-8, the fine tailings of the fine flotation column 7-2 are fed into the roughing flotation column 7-1 by the seventh slurry pump 4-7, the fine foam of the fine flotation column 7-2 flows into the fourth pump pool 5-4, and is fed into the second filter press 6-2 for filter pressing and dehydration treatment through the fourth slurry pump 4-4, the concentrate filter cake is sold to the pyrometallurgical enterprise as a product, and the filtrate is returned to the third pump pool 5-3 through the sixth pump pool 5-6 and the sixth slurry pump 4-6 as flotation water for recycling. The flotation tailings of the roughing flotation column 7-1 are slurried in the pre-leaching stirring barrel 3-3 and fed into the leaching stirring tank 8 by the fifth pump pool 5-5 and the fifth slurry pump 4-5 for cyanide leaching. The leached precious liquid is subjected to subsequent replacement recovery process, and the secondary cyanidation tailings are discharged into the tailings pond for storage after washing and filtration.

Claims

1. A system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings, comprising a dispersing dryer (1) and a rotary kiln (2) interconnected by a conveyor belt, an acid leaching stirring tank (3-1) with a feed inlet and a pulp outlet, a pre-selection stirring tank (3-2) and a pre-leaching stirring tank (3-3), a first filter press (6-1) and a second filter press (6-2) with a feed inlet, a filtrate outlet and a filter cake outlet, a roughing flotation column (7-1) with a feed inlet, a roughing froth outlet and a flotation tailings outlet, and a concentrating flotation column (7-2) with a feed inlet, a concentrating froth outlet and a discharge outlet, and a leaching stirring tank (8), characterized in that: The slag outlet of the rotary kiln (2) is connected to the feed port of the acid leaching stirring tank (3-1) through an inclined slot, the slurry outlet of the acid leaching stirring tank (3-1) is connected to the feed port of the first filter press (6-1), and the filtrate outlet of the first filter press (6-1) is connected to the feed port of the acid leaching stirring tank (3-1); the filter cake outlet of the first filter press (6-1) is connected to the feed port of the pre-selection stirring tank (3-2) through a conveyor belt, the slurry outlet of the pre-selection stirring tank (3-2) is connected to the feed port of the roughing flotation column (7-1), and the flotation tail of the roughing flotation column (7-1) is connected to the feed port of the pre-selection flotation column (7-1). The ore outlet is connected to the feed port of the pre-leaching stirring tank (3-3), and the ore pulp outlet of the pre-leaching stirring tank (3-3) is connected to the leaching stirring tank (8); the roughing foam outlet of the roughing flotation column (7-1) is connected to the feed port of the fine flotation column (7-2) through a pipeline, and the discharge port of the fine flotation column (7-2) is connected to the feed port of the roughing flotation column (7-1); the fine foam outlet of the fine flotation column (7-2) is connected to the feed port of the second filter press (6-2); and the filtrate outlet of the second filter press (6-2) is connected to the feed port of the roughing flotation column (7-1).

2. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 1, characterized in that: The slurry outlet of the acid leaching stirring tank (3-1) is connected to the first pump tank (5-1) via a pipeline, and the discharge port of the first pump tank (5-1) is connected to the feed port of the first filter press (6-1) via a pipeline installed with a first slurry pump (4-1).

3. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 1, characterized in that: The filtrate outlet of the first filter press (6-1) is connected to a second pump tank (5-2), and the discharge port of the second pump tank (5-2) is connected to the feed port of the acid leaching stirring tank (3-1) via a pipeline equipped with a second slurry pump (4-2).

4. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 1, characterized in that: The ore pulp outlet of the pre-selection stirring tank (3-2) is connected to a third pump tank (5-3) via a pipeline, and the third pump tank (5-3) is connected to the feed port of the roughing flotation column (7-1) via a pipeline equipped with a third slurry pump (4-3).

5. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 4, characterized in that: The filtrate outlet of the second filter press (6-2) is connected to the sixth pump tank (5-6) via a pipeline, and the discharge port of the sixth pump tank (5-6) is connected to the feed port of the third pump tank (5-3) via a pipeline installed with a sixth slurry pump (4-6).

6. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 1, characterized in that: The selected foam outlet of the selected flotation column (7-2) is connected to the fourth pump pool (5-4) via a pipeline, and the discharge port of the fourth pump pool (5-4) is connected to the feed port of the second filter press (6-2) via a pipeline installed with a fourth slurry pump (4-4).

7. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 1, characterized in that: The slurry outlet of the pre-leaching stirring tank (3-3) is connected to a fifth pump tank (5-5) via a pipeline, and the discharge port of the fifth pump tank (5-5) is connected to the leaching stirring tank (8) via a pipeline installed with a fifth slurry pump (4-5).

8. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 1, characterized in that: The discharge port of the selective flotation column (7-2) is connected to the feed port of the roughing flotation column (7-1) via a pipeline equipped with a seventh slurry pump (4-7).

9. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to claim 1, characterized in that: The flotation tailings outlet of the roughing flotation column (7-1) is connected to the feed inlet of the pre-immersion stirring tank (3-3) via a pipeline equipped with an eighth slurry pump (4-8).

10. The system for secondary recovery of gold from arsenic-containing and carbon-containing cyanide tailings according to any one of claims 1 to 9, characterized in that: The roughing flotation column (7-1) and the cleaning flotation column (7-2) are both cyclonic static microbubble flotation columns.

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