System and method for recovering gold from gold-containing solution

Abstract

The present application discloses a system and method for recovering gold from a gold-containing solution. The recovery system comprises an ion identification system, a reduction system, a washing system, and an evaporation system. The recovery method specifically comprises the following steps: (1) primary recognition; (2) secondary recognition; (3) reduction for gold precipitation; (4) gold powder washing; and (5) waste liquid evaporation. According to the present application, AuCl4 - is recognized by means of chloride ions, a gold-rich solution is directly reduced to produce a qualified gold powder product (99.995%), a gold-depleted solution and a post-reduction solution are evaporated to be concentrated, the condensate is reused, the restoration and regeneration of the chloride ions are realized, an ion recognition agent is recycled, and no waste liquid or waste gas is generated during production.

Description

A system for recovering gold from gold-containing solution and a method thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application No. 202411227620.9, filed on September 3, 2024, and entitled "A system for recovering gold from gold-containing solution and a method thereof", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of precious metal hydrometallurgy, more particularly to a system for recovering gold from gold-containing solution and a method thereof. BACKGROUND

[0004] There are many methods for recovering gold from gold-containing solution, but all have certain limitations. The gold production methods commonly use reduction-electrolysis-melting, reduction-chlorination-reduction methods. Among them, the reduction-electrolysis method requires a large system and the composition of gold anode plate has requirements; the reduction-chlorination-reduction method has a long process, low gold recovery, poor selectivity of reducing agent, poor working environment, and unstable gold quality.

[0005] With the complexity of raw materials, the gold concentration of gold-containing solution varies greatly in each factory. It is difficult to produce qualified gold at one time in low concentration gold-containing solution, and the process of enrichment and refining is required.

[0006] Therefore, how to develop a gold production system and method with strong selectivity, strong adaptability, high efficiency and environmental protection is a problem to be solved by those skilled in the art. SUMMARY

[0007] One or more embodiments of the present application provide a system for recovering gold from gold-containing solution, comprising an ion recognition system, a reduction system, a washing system and an evaporation system.

[0008] The ion recognition system comprises a separated gold liquid storage tank, a separated gold liquid metering tank, a carrier gold liquid storage tank, a carrier gold liquid metering tank, an ion recognition agent storage tank, an ion recognition agent metering tank, a first recognition reaction kettle, a second recognition reaction kettle, a rich gold liquid pump, a secondary separated gold liquid pump, a rich gold liquid storage tank, a secondary separated gold liquid storage tank, a carrier gold liquid pump, a poor gold liquid storage tank and a poor gold liquid pump; the separated gold liquid storage tank is sequentially connected with the separated gold liquid metering tank and the first recognition reaction kettle, the carrier gold liquid storage tank is sequentially connected with the carrier gold liquid metering tank and the first recognition reaction kettle, the ion recognition agent storage tank is sequentially connected with the ion recognition agent metering tank and the first recognition reaction kettle, and the first recognition reaction kettle is sequentially connected with the rich gold liquid pump, the rich gold liquid storage tank and a reduction system; the ion recognition agent storage tank is sequentially connected with the ion recognition agent metering tank and the second recognition reaction kettle, the first recognition reaction kettle is sequentially connected with the secondary separated gold liquid pump, the secondary separated gold liquid storage tank and the second recognition reaction kettle, the second recognition reaction kettle is sequentially connected with the carrier gold liquid pump and the carrier gold liquid storage tank, and the second recognition reaction kettle is sequentially connected with the poor gold liquid pump, the poor gold liquid storage tank and an evaporation system;

[0009] The reduction system comprises a reduction reaction kettle, a reducing agent preparation tank, a post-reduction liquid storage tank, an oil phase pump and a liquid phase pump; the rich gold liquid storage tank is sequentially connected with the reduction reaction kettle and a washing system, the reducing agent preparation tank is connected with the reduction reaction kettle, the reduction reaction kettle is sequentially connected with the oil phase pump and the ion recognition agent storage tank, and the reduction reaction kettle is sequentially connected with the liquid phase pump, the post-reduction liquid storage tank and an evaporation system;

[0010] The washing system comprises a washing barrel, a hydrochloric acid washing tank, a nitric acid washing tank, an ammonia water washing tank and a pure water washing tank; the reduction reaction kettle is connected with the washing barrel, and the hydrochloric acid washing tank, the nitric acid washing tank, the ammonia water washing tank and the pure water washing tank are respectively connected with the washing barrel;

[0011] The evaporation system comprises an evaporator, a condenser, a circulating tank, a circulating pump, an acid liquid tank, a cold water barrel and a hot water barrel; the poor gold liquid storage tank and the post-reduction liquid storage tank are sequentially connected with the circulating tank, the circulating pump, the evaporator, the condenser and the acid liquid tank, and the cold water barrel and the hot water barrel are respectively connected with the condenser.

[0012] A method for recovering gold from a separated gold liquid, which adopts the above recovery system and specifically comprises the following steps:

[0013] (1) primary recognition

[0014] The separated gold liquid in the separated gold liquid storage tank is discharged to the first recognition reaction kettle through the separated gold liquid metering tank, the ion recognition agent A in the ion recognition agent storage tank is discharged to the first recognition reaction kettle through the ion recognition agent metering tank, then the stirrer of the first recognition reaction kettle is started, the separated gold liquid and the ion recognition agent are fully reacted, and then are separated to obtain the rich gold liquid and the secondary separated gold liquid, finally the rich gold liquid is discharged to the rich gold liquid storage tank through the rich gold liquid pump, and the secondary separated gold liquid is discharged to the secondary separated gold liquid storage tank through the secondary separated gold liquid pump;

[0015] (2) secondary recognition

[0016] The secondary gold refining liquid in the secondary gold refining liquid storage tank is discharged into the second identification reaction kettle, the ion recognition agent B in the ion recognition agent storage tank is discharged into the second identification reaction kettle through the ion recognition agent metering tank, and then the stirrer of the second identification reaction kettle is started. The secondary gold refining liquid and the ion recognition agent are fully reacted, and are separated after standing, to obtain a gold-loaded liquid and a gold-depleted liquid, respectively. Finally, the gold-loaded liquid is discharged into the gold-loaded liquid storage tank through a gold-loaded liquid pump, and the gold-depleted liquid is discharged into the gold-depleted liquid storage tank through a gold-depleted liquid pump;

[0017] (3) Reduction and gold precipitation

[0018] The gold-rich liquid in the gold-rich liquid storage tank is discharged into the reduction reaction kettle, the stirrer of the reduction reaction kettle is started, and the temperature is raised. Then, the reducing agent in the reducing agent preparation tank is discharged into the reduction reaction kettle, and the gold-rich liquid and the reducing agent are fully reacted. After cooling and standing, ion recognition agent, post-reduction liquid and gold powder are obtained, respectively. Finally, the ion recognition agent is discharged into the ion recognition agent storage tank through an oil phase pump, the post-reduction liquid is discharged into the post-reduction liquid storage tank through a liquid phase pump, and the gold powder is discharged into the washing barrel through the bottom valve of the reduction reaction kettle;

[0019] (4) Gold powder washing

[0020] Steam is introduced into the washing barrel to raise the temperature for washing. Hydrochloric acid in the hydrochloric acid washing tank is discharged into the washing barrel for soaking and washing, and the concentrated hydrochloric acid obtained is discharged into the hydrochloric acid washing tank. Pure water in the pure water washing tank is discharged into the washing barrel until the washing barrel is neutralized. Ammonia water in the ammonia water washing tank is discharged into the washing barrel for soaking and washing, and the concentrated ammonia water obtained is discharged into the ammonia water washing tank. Pure water in the pure water washing tank is discharged into the washing barrel until the washing barrel is neutralized. Nitric acid in the nitric acid washing tank is discharged into the washing barrel for soaking and washing, and the concentrated nitric acid obtained is discharged into the nitric acid washing tank. Pure water in the pure water washing tank is discharged into the washing barrel until the washing barrel is neutralized. The gold powder in the washing barrel is dried to obtain the gold powder product.

[0021] (5) Evaporation of waste liquid

[0022] The gold-depleted liquid in the gold-depleted liquid storage tank and the post-reduction liquid in the post-reduction liquid storage tank are respectively discharged into the evaporator through the circulating tank and the circulating pump, and at the same time, the steam valve of the evaporator is opened to adjust the opening degree for evaporation and concentration, to obtain a gold-depleted liquid concentrate, a post-reduction liquid concentrate and an acid mist, respectively. The gold-depleted liquid concentrate is further recovered for valuable metals selenium and tellurium, the post-reduction liquid concentrate is returned to the reducing agent preparation tank, and the acid mist is discharged into the condenser, while the cold water barrel and the hot water barrel are opened for condensation. The obtained acid liquid is discharged into the acid liquid tank.

[0023] In one or more embodiments, in step (1), the composition of the gold separation liquid is: Au (gold) 0.30-0.38 g / L, Ag (silver) 0.05-0.15 g / L, Pt (platinum) 3 mg / L, Pd (palladium) 30 mg / L, Se (selenium) 0.9-1.5 g / L, Te (tellurium) 10-13 g / L, Bi (bismuth) 8 g / L, As (arsenic) 4 g / L, and Cu (copper) 0.6-1.3 g / L.

[0024] In one or more embodiments, in step (1), the composition of the gold separation liquid is: Au 0.30 g / L, Ag 0.15 g / L, Pt 3 mg / L, Pd 30 mg / L, Se 1.5 g / L, Te 10 g / L, Bi 8 g / L, As 4 g / L, and Cu 0.6 g / L.

[0025] In one or more embodiments, in step (1), the ion recognition agent A is a mixed solution of pillararene and chloroform.

[0026] In one or more embodiments, in step (1), the molar concentration ratio of pillararene to chloroform is (8-10):1.

[0027] In one or more embodiments, in step (1), the volume ratio of the gold separation liquid to the ion recognition agent is 1:(0.8-1).

[0028] In one or more embodiments, in step (1), the volume ratio of the gold separation liquid to the ion recognition agent is 1:1.

[0029] In one or more embodiments, in step (1), the reaction temperature is 25°C (room temperature), and the reaction time is 2-3 h.

[0030] In one or more embodiments, in step (1), the reaction temperature is 25°C (room temperature), and the reaction time is 2 h.

[0031] In one or more embodiments, in step (2), the ion recognition agent B is a mixed solution of pillararene and chloroform.

[0032] In one or more embodiments, in step (2), the molar concentration ratio of pillararene to chloroform is (15-20):1.

[0033] In one or more embodiments, in step (2), the volume ratio of the secondary gold separation liquid to the ion recognition agent is 1:(0.8-1).

[0034] In one or more embodiments, in step (2), the volume ratio of the secondary gold separation liquid to the ion recognition agent is 1:0.8.

[0035] In one or more embodiments, in step (2), the reaction temperature is 25 DEG C (room temperature), and the reaction time is 1-2 h.

[0036] In one or more embodiments, in step (2), the reaction temperature is 25 DEG C (room temperature), and the reaction time is 2 h.

[0037] In one or more embodiments, in step (3), the reducing agent is ammonium oxalate.

[0038] In one or more embodiments, in step (3), the amount of ammonium oxalate is 1.5 times the mass of gold in the gold-rich solution.

[0039] In one or more embodiments, in step (3), the reaction temperature is 85-95 DEG C, and the reaction time is 4-6 h.

[0040] In one or more embodiments, in step (3), the reaction temperature is 85 DEG C, and the reaction time is 4 h.

[0041] In one or more embodiments, in step (5), the steam flow rate for evaporation and concentration is 0.5 m 3 / h.

[0042] In one or more embodiments, in step (5), the circulation flow rate of the gold-poor solution and the reduced solution is 80 L / h.

[0043] In one or more embodiments, in step (5), the cooling water flow rate for condensation is 50 L / h.

[0044] The application also claims the use of the gold recovery system or the gold recovery method in the gold-rich solution.

[0045] The technical solutions can achieve the following beneficial effects compared with the prior art:

[0046] 1、The selective ion recognition agent is used to selectively recognize AuCl4 - ions in the gold-rich solution, effectively separating gold from other elements, and the gold-rich solution is reduced to obtain gold, the gold-poor solution and the reduced solution are evaporated to realize acid recycling, and the ion recognition agent and the reducing agent are recycled to realize zero discharge of waste liquid and waste gas.

[0047] 2、The process is smooth, easy to operate, the ion recognition selectivity is high, and the separation of gold and impurity elements is complete. There is no intervention of cyanide, sulfide, nitrogen oxide and sodium ion in the traditional gold recovery process, which reduces the wastewater treatment cost, has high efficiency and environmental protection performance, the whole system has no waste liquid and waste gas discharge, can realize "one-step gold extraction", has the advantages of low cost, high gold recovery rate, high quality, strong recognition ability, stability, strong adaptability, high efficiency and the like. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only part of the embodiments of the present application, and all other drawings obtained by those skilled in the art without creative labor based on the provided drawings also belong to the protection scope of the present application.

[0049] Fig. 1 is a structural schematic diagram of a gold recovery system in a gold separation liquid according to the present application;

[0050] Fig. 2 is a process flow diagram of a gold recovery method according to the present application.

[0051] BRIEF DESCRIPTION OF DRAWINGS 1-gold separation liquid storage tank, 2-gold separation liquid metering tank, 3-gold carrying liquid storage tank, 4-gold carrying liquid metering tank, 5-ion recognition agent storage tank, 6-ion recognition agent metering tank, 7-first identification reaction kettle, 8-second identification reaction kettle, 9-gold-rich liquid pump, 10-secondary gold separation liquid pump, 11-gold-rich liquid storage tank, 12-secondary gold separation liquid storage tank, 13-gold carrying liquid pump, 14-gold-poor liquid storage tank, 15-gold-poor liquid pump, 16-reduction reaction kettle, 17-reducing agent preparation tank, 18-reduced liquid storage tank, 19-oil phase pump, 20-liquid phase pump, 21-washing barrel, 22-hydrochloric acid washing tank, 23-nitric acid washing tank, 24-ammonia water washing tank, 25-pure water washing tank, 26-evaporator, 27-condenser, 28-circulation tank, 29-circulation pump, 30-acid liquid tank, 31-cold water barrel, 32-hot water barrel. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application.

[0053] Embodiment 1

[0054] According to the embodiment of the present application, a gold recovery system in a gold separation liquid is provided, as shown in Fig. 1, which comprises an ion recognition system, a reduction system, a washing system and an evaporation system;

[0055] The ion recognition system comprises a gold separation liquid storage tank 1, a gold separation liquid metering tank 2, a gold carrier liquid storage tank 3, a gold carrier liquid metering tank 4, an ion recognition agent storage tank 5, an ion recognition agent metering tank 6, a first recognition reaction kettle 7, a second recognition reaction kettle 8, a gold-rich liquid pump 9, a secondary gold separation liquid pump 10, a gold-rich liquid storage tank 11, a secondary gold separation liquid storage tank 12, a gold carrier liquid pump 13, a gold-poor liquid storage tank 14 and a gold-poor liquid pump 15. The gold separation liquid storage tank 1 is connected to the gold separation liquid metering tank 2 and the first recognition reaction kettle 7 in sequence, the gold carrier liquid storage tank 3 is connected to the gold carrier liquid metering tank 4 and the first recognition reaction kettle 7 in sequence, the ion recognition agent storage tank 5 is connected to the ion recognition agent metering tank 6 and the first recognition reaction kettle 7 in sequence (not shown in the figure), the first recognition reaction kettle 7 is connected to the gold-rich liquid pump 9, the gold-rich liquid storage tank 11 and the reduction system in sequence. The ion recognition agent storage tank 5 is connected to the ion recognition agent metering tank 6 and the second recognition reaction kettle 8 in sequence, the first recognition reaction kettle 7 is connected to the secondary gold separation liquid pump 10, the secondary gold separation liquid storage tank 12 and the second recognition reaction kettle 8 in sequence, the second recognition reaction kettle 8 is connected to the gold carrier liquid pump 13, the gold carrier liquid storage tank 3 and the gold-poor liquid pump 15, the gold-poor liquid storage tank 14 and the evaporation system in sequence.

[0056] The reduction system comprises a reduction reaction kettle 16, a reducing agent preparation tank 17, a post-reduction liquid storage tank 18, an oil phase pump 19 and a liquid phase pump 20. The gold-rich liquid storage tank 11 is connected to the reduction reaction kettle 16 and the washing system in sequence, the reducing agent preparation tank 17 is connected to the reduction reaction kettle 16, the reduction reaction kettle 16 is connected to the oil phase pump 19 and the ion recognition agent storage tank 5 in sequence, and the reduction reaction kettle 16 is connected to the liquid phase pump 20, the post-reduction liquid storage tank 18 and the evaporation system in sequence.

[0057] The washing system comprises a washing barrel 21, a hydrochloric acid washing tank 22, a nitric acid washing tank 23, an ammonia water washing tank 24 and a pure water washing tank 25. The reduction reaction kettle 16 is connected to the washing barrel 21, and the hydrochloric acid washing tank 22, the nitric acid washing tank 23, the ammonia water washing tank 24 and the pure water washing tank 25 are respectively connected to the washing barrel 21.

[0058] The evaporation system comprises an evaporator 26, a condenser 27, a circulating tank 28, a circulating pump 29, an acid liquid tank 30, a cold water barrel 31 and a hot water barrel 32. The gold-poor liquid storage tank 14 and the post-reduction liquid storage tank 18 are respectively connected to the circulating tank 28, the circulating pump 29, the evaporator 26, the condenser 27 and the acid liquid tank 30 in sequence, and the cold water barrel 31 and the hot water barrel 32 are respectively connected to the condenser 27.

[0059] Example 2

[0060] According to the embodiments of the present application, a method for recovering gold from a gold separation liquid is provided, as shown in FIG. 2, and specifically includes the following steps:

[0061] (1) Primary identification

[0062] The gold separation liquid in the gold separation liquid storage tank 1 is discharged to the first identification reaction kettle 7 through the gold separation liquid metering tank 2, the ion identification agent A in the ion identification agent storage tank 5 is discharged to the first identification reaction kettle 7 through the ion identification agent metering tank 6, and then the stirrer of the first identification reaction kettle 7 is started. The gold separation liquid and the ion identification agent with a volume ratio of 1:1 are fully reacted at 25°C for 2h, and then separated by standing, to obtain a gold-rich liquid and a secondary gold separation liquid, respectively. Finally, the gold-rich liquid is discharged to the gold-rich liquid storage tank 11 through the gold-rich liquid pump 9, and the secondary gold separation liquid is discharged to the secondary gold separation liquid storage tank 12 through the secondary gold separation liquid pump 10.

[0063] The gold separation liquid is a gold separation liquid produced by copper anode copper removal and chlorination, and the composition is: Au 0.30g / L, Ag 0.15g / L, Pt 3mg / L, Pd 30mg / L, Se 1.5g / L, Te 10g / L, Bi 8g / L, As 4g / L and Cu 0.6g / L.

[0064] The ion identification agent A is a mixed solution of pillar arenes and chloroform, and the molar concentration ratio of the two is (8-10):1.

[0065] (2) Secondary identification

[0066] The secondary gold separation liquid in the secondary gold separation liquid storage tank 12 is discharged to the second identification reaction kettle 8, the ion identification agent B in the ion identification agent storage tank 5 is discharged to the second identification reaction kettle 8 through the ion identification agent metering tank 6, and then the stirrer of the second identification reaction kettle 8 is started. The secondary gold separation liquid and the ion identification agent with a volume ratio of 1:0.8 are fully reacted at 25°C for 2h, and then separated by standing, to obtain a gold-loaded liquid and a gold-lean liquid, respectively. Finally, the gold-loaded liquid is discharged to the gold-loaded liquid storage tank 3 through the gold-loaded liquid pump 13, and the gold-lean liquid is discharged to the gold-lean liquid storage tank 14 through the gold-lean liquid pump 15.

[0067] The ion identification agent B is a mixed solution of pillar arenes and chloroform, and the molar concentration ratio of the two is (15-20):1.

[0068] (3) Reduction and gold deposition

[0069] The gold-rich liquid in the gold-rich liquid storage tank 11 is discharged into the reduction reaction kettle 16, the agitator of the reduction reaction kettle 16 is started, the temperature is raised to 85℃, then the reducing agent in the reducing agent preparation tank 17 is discharged into the reduction reaction kettle 16, the gold-rich liquid and 1.5 times the mass of the reducing agent are fully reacted for 4h, the temperature is lowered, and then separated to obtain the ion recognition agent, the reduced liquid and the gold powder, finally the ion recognition agent is discharged into the ion recognition agent storage tank 5 through the oil phase pump 19, the reduced liquid is discharged into the reduced liquid storage tank 18 through the liquid phase pump 20, and the gold powder is discharged into the washing barrel 21 through the bottom valve of the reduction reaction kettle 16;

[0070] (4) Gold powder washing

[0071] Steam is introduced into the washing barrel 21 to raise the temperature for washing; hydrochloric acid in the hydrochloric acid washing tank 22 is discharged into the washing barrel 21 for soaking and washing, and the obtained concentrated hydrochloric acid liquid is discharged into the hydrochloric acid washing tank 22; pure water in the pure water washing tank 25 is discharged into the washing barrel 21 for washing until neutral; ammonia water in the ammonia water washing tank 24 is discharged into the washing barrel 21 for soaking and washing, and the obtained concentrated ammonia water liquid is discharged into the ammonia water washing tank 24; pure water in the pure water washing tank 25 is discharged into the washing barrel 21 for washing until neutral; nitric acid in the nitric acid washing tank 23 is discharged into the washing barrel 21 for soaking and washing, and the obtained concentrated nitric acid liquid is discharged into the nitric acid washing tank 23; pure water in the pure water washing tank 25 is discharged into the washing barrel 21 for washing until neutral; and the gold powder in the washing barrel 21 is dried to obtain the gold powder product;

[0072] (5) Evaporation of waste liquid

[0073] The gold-poor liquid in the gold-poor liquid storage tank 14 and the reduced liquid in the reduced liquid storage tank 18 are respectively discharged into the evaporator 26 through the circulating tank 28 and the circulating pump 29, and at the same time, the steam valve of the evaporator 26 is opened to adjust the opening degree for evaporation and concentration, the steam flow rate of evaporation and concentration is 0.5m 3 / h, the circulating flow rate of the gold-poor liquid and the reduced liquid is 80L / h, and the gold-poor liquid concentrated liquid, the reduced liquid concentrated liquid and the evaporated acid mist are obtained, the gold-poor liquid concentrated liquid is further used to recover valuable metals selenium and tellurium, the reduced liquid concentrated liquid is returned to the reducing agent preparation tank 17, and the evaporated acid mist is discharged into the condenser 27, and at the same time, the cold water barrel 31 and the hot water barrel 32 are opened for condensation, the cooling water flow rate of condensation is 50L / h, and the obtained acid liquid is discharged into the acid liquid tank 30.

[0074] Example 3

[0075] According to the embodiments of the present application, a method for recovering gold from gold-containing liquid is provided, as shown in FIG. 2, which specifically comprises the following steps:

[0076] (1) Primary identification

[0077] The gold separation liquid in the gold separation liquid storage tank 1 is discharged to the first identification reaction kettle 7 through the gold separation liquid metering tank 2, the ion identification agent A in the ion identification agent storage tank 5 is discharged to the first identification reaction kettle 7 through the ion identification agent metering tank 6, and then the stirrer of the first identification reaction kettle 7 is started. The gold separation liquid and the ion identification agent with a volume ratio of 1:0.8 are fully reacted at 25℃ for 2h, and then separated and stored to obtain the rich gold liquid and the secondary gold separation liquid, respectively. Finally, the rich gold liquid is discharged to the rich gold liquid storage tank 11 through the rich gold liquid pump 9, and the secondary gold separation liquid is discharged to the secondary gold separation liquid storage tank 12 through the secondary gold separation liquid pump 10;

[0078] The gold separation liquid is a gold separation liquid produced by copper anode copper removal residue chlorination, and the composition is: Au 0.30g / L, Ag 0.15g / L, Pt 3mg / L, Pd 30mg / L, Se 1.5g / L, Te 10g / L, Bi 8g / L, As 4g / L and Cu 0.6g / L;

[0079] The ion identification agent A is a mixed solution of pillar arene and chloroform, and the molar concentration ratio of the two is (8-10):1;

[0080] (2) Secondary identification

[0081] The secondary gold separation liquid in the secondary gold separation liquid storage tank 12 is discharged to the second identification reaction kettle 8, the ion identification agent B in the ion identification agent storage tank 5 is discharged to the second identification reaction kettle 8 through the ion identification agent metering tank 6, and then the stirrer of the second identification reaction kettle 8 is started. The secondary gold separation liquid and the ion identification agent with a volume ratio of 1:1 are fully reacted at 25℃ for 2h, and then separated and stored to obtain the gold-loaded liquid and the poor gold liquid, respectively. Finally, the gold-loaded liquid is discharged to the gold-loaded liquid storage tank 3 through the gold-loaded liquid pump 13, and the poor gold liquid is discharged to the poor gold liquid storage tank 14 through the poor gold liquid pump 15;

[0082] The ion identification agent B is a mixed solution of pillar arene and chloroform, and the molar concentration ratio of the two is (15-20):1;

[0083] (3) Reduction and gold deposition

[0084] The rich gold liquid in the rich gold liquid storage tank 11 is discharged to the reduction reaction kettle 16, the stirrer of the reduction reaction kettle 16 is started, and the temperature is raised to 90℃. Then the reducing agent in the reducing agent preparation tank 17 is discharged to the reduction reaction kettle 16, and the rich gold liquid and 1.5 times the mass of the reducing agent are fully reacted for 5h. After cooling, the ion identification agent, the reduced liquid and the gold powder are separated and stored, respectively. Finally, the ion identification agent is discharged to the ion identification agent storage tank 5 through the oil phase pump 19, the reduced liquid is discharged to the reduced liquid storage tank 18 through the liquid phase pump 20, and the gold powder is discharged to the washing barrel 21 through the bottom valve of the reduction reaction kettle 16;

[0085] (4) Gold powder washing

[0086] The steam is introduced into the washing barrel 21 to warm up the washing; the hydrochloric acid in the hydrochloric acid washing tank 22 is discharged into the washing barrel 21 to soak, filtered, and the obtained concentrated hydrochloric acid is discharged into the hydrochloric acid washing tank 22; the pure water in the pure water washing tank 25 is discharged into the washing barrel 21 to wash to neutral; the ammonia water in the ammonia water washing tank 24 is discharged into the washing barrel 21 to soak, filtered, and the obtained concentrated ammonia water is discharged into the ammonia water washing tank 24; the pure water in the pure water washing tank 25 is discharged into the washing barrel 21 to wash to neutral; the gold powder in the washing barrel 21 is dried, and the gold powder product is obtained;

[0087] (5) Evaporation of waste liquid

[0088] The poor gold liquid in the poor gold liquid storage tank 14 and the reduced liquid in the reduced liquid storage tank 18 are respectively discharged into the evaporator 26 through the circulating tank 28 and the circulating pump 29, and at the same time, the steam valve of the evaporator 26 is opened to adjust the opening degree for evaporation and concentration, and the steam flow of evaporation and concentration is 0.5 m 3 / h, the circulating flow of the poor gold liquid and the reduced liquid is 80 L / h, and the poor gold liquid concentrated liquid, the reduced liquid concentrated liquid and the evaporated acid mist are obtained, the poor gold liquid concentrated liquid is further recovered for valuable metals selenium and tellurium, the reduced liquid concentrated liquid is returned to the reducing agent preparation tank 17, and the evaporated acid mist is discharged into the condenser 27, and at the same time, the cold water bucket 31 and the hot water bucket 32 are opened for condensation, and the cooling water flow of condensation is 50 L / h, and the obtained acid liquid is discharged into the acid liquid tank 30.

[0089] Example 4

[0090] According to the embodiments of the present application, a method for recovering gold from a gold separation liquid is provided, as shown in FIG. 2, which specifically comprises the following steps:

[0091] (1) Primary identification

[0092] The gold separation liquid in the gold separation liquid storage tank 1 is discharged into the first identification reaction kettle 7 through the gold separation liquid metering tank 2, the ion identification agent A in the ion identification agent storage tank 5 is discharged into the first identification reaction kettle 7 through the ion identification agent metering tank 6, and then the stirrer of the first identification reaction kettle 7 is started, the volume ratio of the gold separation liquid and the ion identification agent is 1:1, and they are fully reacted at 25℃ for 3h, and then separated by standing, and the gold-rich liquid and the secondary gold separation liquid are obtained, and finally the gold-rich liquid is discharged into the gold-rich liquid storage tank 11 through the gold-rich liquid pump 9, and the secondary gold separation liquid is discharged into the secondary gold separation liquid storage tank 12 through the secondary gold separation liquid pump 10;

[0093] The gold separation solution is the gold separation solution produced by chlorination of copper anode decoupling slag, and its composition is: Au 0.30g / L, Ag 0.15g / L, Pt 3mg / L, Pd 30mg / L, Se 1.5g / L, Te 10g / L, Bi 8g / L, As 4g / L and Cu 0.6g / L;

[0094] Ion recognition agent A is a mixed solution of columnar aromatic hydrocarbons and chloroform, with a molar concentration ratio of (8-10):1.

[0095] (2) Secondary recognition

[0096] The secondary gold solution in the secondary gold solution storage tank 12 is discharged to the second identification reaction vessel 8. The ion identification agent B in the ion identification agent storage tank 5 is discharged to the second identification reaction vessel 8 via the ion identification agent metering tank 6. Then, the stirrer of the second identification reaction vessel 8 is started, and the secondary gold solution and ion identification agent with a volume ratio of 1:0.8 are fully reacted at 25°C for 1 hour. After standing and separation, gold-loaded solution and gold-poor solution are obtained respectively. Finally, the gold-loaded solution is discharged to the gold-loaded solution storage tank 3 via the gold-loaded solution pump 13, and the gold-poor solution is discharged to the gold-poor solution storage tank 14 via the gold-poor solution pump 15.

[0097] Ion recognition agent B is a mixed solution of columnar aromatic hydrocarbons and chloroform, with a molar concentration ratio of (15-20):1.

[0098] (3) Reduction of immersion gold

[0099] The gold-rich liquid in the gold-rich liquid storage tank 11 is discharged into the reduction reactor 16. The stirrer of the reduction reactor 16 is started and the temperature is raised to 95°C. Then the reducing agent in the reducing agent preparation tank 17 is discharged into the reduction reactor 16. The gold-rich liquid and 1.5 times the mass of the reducing agent are reacted fully for 6 hours. After cooling, the mixture is allowed to stand and separate to obtain the ion recognition agent, the reduced liquid and the gold powder. Finally, the ion recognition agent is discharged into the ion recognition agent storage tank 5 through the oil phase pump 19, the reduced liquid is discharged into the reduced liquid storage tank 18 through the liquid phase pump 20, and the gold powder is discharged into the washing tank 21 through the bottom valve of the reduction reactor 16.

[0100] (4) Gold powder washing

[0101] The steam is introduced into the washing barrel 21 to warm up the washing; the hydrochloric acid in the hydrochloric acid washing tank 22 is discharged into the washing barrel 21 to soak and wash, and then filtered to obtain concentrated hydrochloric acid liquid which is discharged into the hydrochloric acid washing tank 22; the pure water in the pure water washing tank 25 is discharged into the washing barrel 21 to wash to neutral; the ammonia water in the ammonia water washing tank 24 is discharged into the washing barrel 21 to soak and wash, and then filtered to obtain concentrated ammonia water liquid which is discharged into the ammonia water washing tank 24; the pure water in the pure water washing tank 25 is discharged into the washing barrel 21 to wash to neutral; the nitric acid in the nitric acid washing tank 23 is discharged into the washing barrel 21 to soak and wash, and then filtered to obtain concentrated nitric acid liquid which is discharged into the nitric acid washing tank 23; the gold powder in the washing barrel 21 is dried to obtain the gold powder product;

[0102] (5) Evaporation of waste liquid

[0103] The poor gold liquid in the poor gold liquid storage tank 14 and the reduced liquid in the reduced liquid storage tank 18 are respectively discharged into the evaporator 26 through the circulating tank 28 and the circulating pump 29, and at the same time, the steam valve of the evaporator 26 is opened to adjust the opening degree for evaporation and concentration, and the steam flow of evaporation and concentration is 0.5 m 3 / h, and the circulating flow of the poor gold liquid and the reduced liquid is 80 L / h, to obtain the concentrated liquid of the poor gold liquid, the concentrated liquid of the reduced liquid and the acid mist of evaporation, respectively, the concentrated liquid of the poor gold liquid is further recovered for valuable metals selenium and tellurium, the concentrated liquid of the reduced liquid is returned to the reducing agent preparation tank 17, and the acid mist of evaporation is discharged into the condenser 27, and at the same time, the cold water bucket 31 and the hot water bucket 32 are opened to condense, and the flow of the cooling water of condensation is 50 L / h, to obtain the acid liquid which is discharged into the acid liquid tank 30.

[0104] Performance test

[0105] The gold powder product (sponge gold) prepared in each of Examples 2-4 is respectively detected and tested according to the standard of GB / T4134-2021. The results are shown in Table 1.

[0106] Table 1: Gold content of gold powder product of Examples 2-4

[0107] As shown in Table 1, the gold content of the gold powder product of Examples 2-4 reaches 99.995%.

[0108] The above test shows that, by means of the chloride ion recognition AuCl4 - , the rich gold liquid is directly reduced to produce qualified gold powder product (99.995%), the poor gold liquid and the reduced liquid are evaporated and concentrated, and the condensed liquid is recycled, so as to realize the regeneration of chloride ions, the recycling of ion recognition agent, and the production process without waste liquid and waste gas.

[0109] Although the embodiments of the present application have been shown and described above, it is to be understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application. Industrial applicability

[0110] The gold recovery system and method of the present application can identify AuCl4 - by chloride ions, and the gold-rich liquid is directly reduced to produce qualified gold powder products (99.995%), the gold-poor liquid and the liquid after reduction are evaporated and concentrated, the condensed liquid is reused, the chloride ions are regenerated, the ion recognition agent is recycled, and no waste liquid and waste gas are generated in the production process.

Claims

1. A system for recovering gold from a gold-containing solution, characterized by comprising: The ion recognition system, the reduction system, the washing system and the evaporation system are included. The ion recognition system includes a separated gold liquid storage tank, a separated gold liquid metering tank, a carrier gold liquid storage tank, a carrier gold liquid metering tank, an ion recognition agent storage tank, an ion recognition agent metering tank, a first recognition reaction kettle, a second recognition reaction kettle, a rich gold liquid pump, a secondary separated gold liquid pump, a rich gold liquid storage tank, a secondary separated gold liquid storage tank, a carrier gold liquid pump, a poor gold liquid storage tank and a poor gold liquid pump; the separated gold liquid storage tank is connected with the separated gold liquid metering tank and the first recognition reaction kettle in sequence, the carrier gold liquid storage tank is connected with the carrier gold liquid metering tank and the first recognition reaction kettle in sequence, the ion recognition agent storage tank is connected with the ion recognition agent metering tank and the first recognition reaction kettle in sequence, the first recognition reaction kettle is connected with the rich gold liquid pump, the rich gold liquid storage tank and the reduction system in sequence; the ion recognition agent storage tank is connected with the ion recognition agent metering tank and the second recognition reaction kettle in sequence, the first recognition reaction kettle is connected with the secondary separated gold liquid pump, the secondary separated gold liquid storage tank and the second recognition reaction kettle in sequence, the second recognition reaction kettle is connected with the carrier gold liquid pump and the carrier gold liquid storage tank in sequence, and the second recognition reaction kettle is connected with the poor gold liquid pump, the poor gold liquid storage tank and the evaporation system in sequence. The reduction system includes a reduction reaction kettle, a reducing agent preparation tank, a post-reduction liquid storage tank, an oil phase pump and a liquid phase pump; the rich gold liquid storage tank is connected with the reduction reaction kettle and the washing system in sequence, the reducing agent preparation tank is connected with the reduction reaction kettle, the reduction reaction kettle is connected with the oil phase pump and the ion recognition agent storage tank in sequence, and the reduction reaction kettle is connected with the liquid phase pump, the post-reduction liquid storage tank and the evaporation system in sequence. The washing system includes a washing barrel, a hydrochloric acid washing tank, a nitric acid washing tank, an ammonia water washing tank and a pure water washing tank; the reduction reaction kettle is connected with the washing barrel, and the hydrochloric acid washing tank, the nitric acid washing tank, the ammonia water washing tank and the pure water washing tank are respectively connected with the washing barrel. The evaporation system includes an evaporator, a condenser, a circulating tank, a circulating pump, an acid liquid tank, a cold water barrel and a hot water barrel; the poor gold liquid storage tank and the post-reduction liquid storage tank are respectively connected with the circulating tank, the circulating pump, the evaporator, the condenser and the acid liquid tank in sequence, and the cold water barrel and the hot water barrel are respectively connected with the condenser.

2. A method for recovering gold from a gold-containing solution, characterized by, The recovery system as claimed in claim 1 includes the following steps: (1) primary recognition The separated gold liquid in the separated gold liquid storage tank is discharged to the first recognition reaction kettle through the separated gold liquid metering tank, the ion recognition agent A in the ion recognition agent storage tank is discharged to the first recognition reaction kettle through the ion recognition agent metering tank, then the stirrer of the first recognition reaction kettle is started, the separated gold liquid and the ion recognition agent are fully reacted, and then they are separated to obtain the rich gold liquid and the secondary separated gold liquid, finally the rich gold liquid is discharged to the rich gold liquid storage tank through the rich gold liquid pump, and the secondary separated gold liquid is discharged to the secondary separated gold liquid storage tank through the secondary separated gold liquid pump; (2) secondary recognition The secondary parting liquid in the secondary parting liquid storage tank is discharged into the second identification reaction kettle, the ion recognition agent B in the ion recognition agent storage tank is discharged into the second identification reaction kettle through the ion recognition agent metering tank, and then the stirrer of the second identification reaction kettle is started to fully react the secondary parting liquid and the ion recognition agent, and then the loaded liquid and the poor gold liquid are obtained by standing and separating, finally the loaded liquid is discharged into the loaded liquid storage tank through the loaded liquid pump, and the poor gold liquid is discharged into the poor gold liquid storage tank through the poor gold liquid pump; (3) Reduction and gold precipitation The rich gold liquid in the rich gold liquid storage tank is discharged into the reduction reaction kettle, the stirrer of the reduction reaction kettle is started, and then the temperature is raised, then the reducing agent in the reducing agent preparation tank is discharged into the reduction reaction kettle, the rich gold liquid and the reducing agent are fully reacted, the temperature is lowered, and then the ion recognition agent, the post-reduction liquid and the gold powder are obtained by standing and separating, finally the ion recognition agent is discharged into the ion recognition agent storage tank through the oil phase pump, the post-reduction liquid is discharged into the post-reduction liquid storage tank through the liquid phase pump, and the gold powder is discharged into the washing barrel through the bottom valve of the reduction reaction kettle; (4) Gold powder washing The steam is introduced into the washing barrel to heat and wash, the hydrochloric acid in the hydrochloric acid washing tank is discharged into the washing barrel to soak and wash, and then the concentrated hydrochloric acid obtained by filtration is discharged into the hydrochloric acid washing tank, the pure water in the pure water washing tank is discharged into the washing barrel to wash to neutral, the ammonia water in the ammonia water washing tank is discharged into the washing barrel to soak and wash, and then the concentrated ammonia water obtained by filtration is discharged into the ammonia water washing tank, the pure water in the pure water washing tank is discharged into the washing barrel to wash to neutral, the nitric acid in the nitric acid washing tank is discharged into the washing barrel to soak and wash, and then the concentrated nitric acid obtained by filtration is discharged into the nitric acid washing tank, the pure water in the pure water washing tank is discharged into the washing barrel to wash to neutral, and then the gold powder in the washing barrel is dried to obtain the gold powder product; (5) Waste liquid evaporation The poor gold liquid in the poor gold liquid storage tank and the post-reduction liquid in the post-reduction liquid storage tank are respectively discharged into the evaporator through the circulating tank and the circulating pump, the steam valve of the evaporator is opened at the same time, and the opening degree is adjusted to evaporate and concentrate to obtain the poor gold liquid concentrate, the post-reduction liquid concentrate and the evaporation acid mist, the poor gold liquid concentrate is further recovered to obtain valuable metals selenium and tellurium, the post-reduction liquid concentrate is returned to the reducing agent preparation tank, and the evaporation acid mist is discharged into the condenser, and the cold water barrel and the hot water barrel are opened at the same time to condense to obtain the acid liquid which is discharged into the acid liquid tank.

3. The method for recovering gold from gold-containing solution according to claim 2, wherein In step (1), the components of the parting liquid are: Au 0.30-0.38g / L, Ag 0.05-0.15g / L, Pt 3mg / L, Pd 30mg / L, Se 0.9-1.5g / L, Te 10-13g / L, Bi 8g / L, As 4g / L and Cu 0.6-1.3g / L.

4. The method for recovering gold from a gold-containing solution according to claim 2 or 3, characterized by, In step (1), the ion recognition agent A is a mixed solution of pillar arene and chloroform.

5. The method for recovering gold from gold-containing solution according to claim 4, wherein In step (1), the molar concentration ratio of the pillar arene and chloroform is (8-10):

1.

6. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 5, wherein In step (1), the volume ratio of the parting liquid and the ion recognition agent is 1:(0.8-1).

7. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 6, wherein In step (1), the reaction temperature is 25℃, and the reaction time is 2-3h.

8. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 7, wherein In step (2), the ion recognition agent B is a mixed solution of pillar arene and chloroform.

9. The method of recovering gold from a gold-containing solution according to claim 8, wherein In step (2), the molar concentration ratio of the pillararene to chloroform is (15-20):

1.

10. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 9, wherein In step (2), the volume ratio of the sub-refined gold solution to the ion recognition agent is 1:(0.8-1).

11. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 10, wherein In step (2), the reaction temperature is 25℃, and the reaction time is 1-2h.

12. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 11, wherein In step (3), the reducing agent is ammonium oxalate.

13. The method of recovering gold from a gold-bearing solution according to claim 12, wherein In step (3), the amount of the ammonium oxalate is 1.5 times the mass of the gold in the rich gold solution.

14. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 13, wherein In step (3), the reaction temperature is 85-95℃, and the reaction time is 4-6h.

15. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 14, wherein In step (5), the vapor flow rate of the evaporation concentration is 0.5 m 3 / h.

16. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 15, wherein In step (5), the circulation flow rate of the poor gold solution and the reduced solution is 80L / h.

17. The method of recovering gold from a gold-containing solution according to any one of claims 2 to 16, wherein In step (5), the cooling water flow rate for condensation is 50L / h.

18. Use of the gold recovery system according to claim 1 or the gold recovery method according to any one of claims 2-17 in the recovery of a refined gold solution.

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