Method for comprehensive recovery of valuable elements from complex gold concentrate resources

Abstract

The application belongs to the technical field of metallurgy and relates to a method for comprehensively recovering valuable elements of complex gold concentrate resources, which comprises the following steps: (1) first-stage cyanidation lean liquid slurry; (2) second-stage pre-cyanidation gold extraction; (3) third-stage flotation gold-loaded carbon enrichment; (4) fourth-stage copper matching slurry; (5) fifth-stage reduction roasting; (6) sixth-stage grinding and acid leaching treatment; (7) seventh-stage steel belt furnace roasting; and (8) eighth-stage cyanidation gold extraction. The whole technological process is simple and smooth, efficient recovery of valuable elements of arsenic-containing carbon gold concentrate and comprehensive utilization of resources are realized, the total gold and silver recovery rate reaches more than 98%, and the economic benefit of enterprises is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology, and in particular relates to a method for the comprehensive recovery of valuable elements in complex gold concentrate resources. Background Technology

[0002] Arsenic-containing carbon gold concentrate is a difficult-to-process gold concentrate. In sulfide minerals, gold is trapped, and carbonaceous matter in the ore adsorbs gold complexes from the cyanide solution, forming a protective layer of various compounds on the gold surface. Conventional cyanidation processes yield very low gold and silver recovery rates, typically between 10% and 50%. Especially when the carbon content is high, the recovery rate is almost zero. In traditional roasting cyanidation methods, due to the light weight of the carbonaceous minerals and the influence of bottom blast and system negative pressure, the residence time in the furnace is too short, and carbon is easily blown out with the flue gas. Therefore, the decarburization rate of the two-stage roasting system is not ideal. Simultaneously, some arsenides exist in the form of arsenates during roasting, which can coat precious metals such as gold and silver. Furthermore, the coating of gold and silver with iron oxides during roasting not only results in low gold and silver recovery rates but also produces highly toxic gases such as arsenic oxide, making production difficult. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a method for the comprehensive recovery of valuable elements from complex gold concentrate resources. The specific technical solution is as follows:

[0004] A method for comprehensive recovery of valuable elements from complex gold concentrate resources includes the following steps:

[0005] (1) Primary cyanide lean liquor preparation: The copper-containing material is used to adjust the configuration of the arsenic-containing carbon gold concentrate. The cyanide system lean liquor with added ammonia is used to adjust the slurry concentration to 15-25 wt%, and the amount of ammonia is 3-5 kg / t to obtain the primary slurry.

[0006] (2) Secondary pre-cyanidation gold extraction: The sodium cyanide concentration of the primary slurry obtained in step (1) is controlled to carry out the cyanidation leaching process, and the lean liquor of the cyanidation system and the cyanidation gold extraction slurry are obtained.

[0007] (3) Three-stage flotation enrichment of gold-loaded carbon: Add a collector to the cyanide gold extraction slurry obtained in step (2) and carry out a process of roughing, scavenging and cleaning to obtain gold-loaded carbon concentrate foam and tailings slurry; the tailings slurry is filtered to obtain tailings filter cake and lean liquor of cyanide system II.

[0008] (4) Four-stage copper slurry preparation: Add copper-containing materials to the tailings filter cake obtained in step (3) to achieve a copper content of 1-4 wt%, and add sulfur-containing substances to achieve a sulfur content of 20-25 wt%. ， The pulp was then adjusted with water to a pulp concentration of 65–70 wt% to obtain a fourth-grade pulp.

[0009] (5) Five-stage reduction roasting: The four-stage slurry obtained in step (4) is stirred evenly and then reduced roasting is carried out to obtain reduction roasting flue gas and reduction roasted sand.

[0010] (6) Six-stage grinding and acid leaching treatment: The reduced roasted sand obtained in step (5) is ground to achieve a grinding fineness of -400 mesh 80-90% to obtain grinding slurry. Then, the sulfuric acid concentration and slurry concentration of the grinding slurry are controlled for acid leaching treatment. Finally, the gold-containing filter cake and filtrate are obtained by pressure filtration.

[0011] (7) Seven-stage steel strip furnace roasting: The gold-containing filter cake obtained in step (6) is transported to an electrically heated steel strip furnace for electrically heated oxidation roasting to obtain oxidation roasting flue gas and oxidation roasted sand;

[0012] (8) Eight-stage cyanide gold extraction: The oxidized roasted sand obtained in step (7) is slurryed and the slurry concentration is controlled at 30-40 wt%. The pH is adjusted to 9-10 with ammonia water, and then the ore is ground to 95-98% of -400 mesh. Sodium cyanide is added for cyanide leaching to obtain cyanide solution and cyanide tailings.

[0013] The composition of the arsenic-carbon gold concentrate in this invention is: gold 20-60 g / t, silver 20-200 g / t, copper 0.10-0.50 wt%, sulfur 5-15 wt%, arsenic 1-5 wt%, and carbon 1-5 wt%. The cyanide system lean solution is derived from cyanide system lean solution one in step (2) and cyanide system lean solution two in step (3).

[0014] This invention employs a pre-cyanidation gold extraction process after cyanidation lean liquor conditioning. Native and exposed gold are leached into gold-cyanide complex ions and introduced into the gold-loaded carbon concentrate for flotation. This process effectively recovers both native and exposed gold. Adding ammonia to the lean liquor of the cyanidation system reduces the likelihood of dissolution reactions between copper-containing materials and sodium cyanide, decreasing sodium cyanide consumption and mitigating the impact of excessive copper dissolution on gold leaching. Simultaneously, the combined flotation process yields gold-loaded carbon concentrate, which allows for pre-recovery of gold, eliminating the problem of secondary encapsulation and loss of easily recoverable gold during roasting. Copper-containing materials are incorporated into the tailings filter cake for reduction roasting. Copper acts as an additive to improve roasting efficiency, reducing the encapsulation of gold by other metal oxides during roasting and thus increasing gold recovery. The addition of sulfur-containing substances ensures the required heat and oxygen levels during roasting. The process involves several steps: First, acid is required. The grinding and acid leaching after roasting allows for the liberation of gold-bearing minerals, fully exposing the gold encapsulated within them. This reduces mineral particle size, increases the specific surface area of ​​gold particles, and eliminates the encapsulation of certain oxides on the gold particle surface. This allows for better exposure of physically and chemically bound gold and silver, thereby improving gold recovery. Second, an electrically heated steel belt furnace is used for oxidative roasting of the acid-leached gold-bearing material. This further enhances the exposure of individual gold particles and eliminates the encapsulation of gold within the minerals. Simultaneously, the roasting process converts acidic substances into sulfur dioxide and sulfur trioxide, which can be returned to the reduction roasting process, reducing the impact of acidic substances on subsequent cyanide leaching. This also solves the problems of high alkali consumption and high costs. Ultimately, the total gold and silver recovery rate from cyanide gold extraction reaches over 98%, an increase of 15-20 wt% compared to conventional processes, significantly improving the company's economic benefits.

[0015] Further, in step (1), the amount of copper-containing material added is 1-5 wt% of arsenic-containing carbon gold concentrate. The copper-containing material is gold-copper concentrate, copper-gold concentrate, or copper-silver ore.

[0016] Furthermore, in step (2), the sodium cyanide concentration is controlled to be 0.20-0.30 wt%, and the cyanide leaching time is 20-28 hours.

[0017] Native gold and exposed gold are converted into gold cyanide complex ions through cyanide leaching, which can fully realize the effective recovery of native gold and exposed gold. A lean solution of the cyanide system with a gold content of 0.03-0.06 mg / L can be obtained.

[0018] Further, in step (3), the collector is kerosene, and the amount of kerosene used is 300-600 g / t. This yields a gold-bearing carbon concentrate with a gold content of 1-10 kg / t, and a tailings filter cake containing 10-30 g / t of gold, 10-30 g / t of silver, 0.10-0.50 wt% of copper, 5-15 wt% of sulfur, 1-5 wt% of arsenic, and 0.1-0.5 wt% of carbon.

[0019] Furthermore, in step (3), the gold-loaded carbon concentrate obtained is smelted by pyrometallurgy to obtain gold ingot products.

[0020] Gold-bearing carbon concentrate is smelted separately using a pyrometallurgical process to obtain gold ingots, eliminating the influence of carbonaceous materials on the roasting process. At the same time, gold is recovered in advance, eliminating the problem of easily recoverable gold being lost due to secondary encapsulation during the roasting process.

[0021] Furthermore, in step (4), the copper content of the copper-containing material is 2-50 wt%; the sulfur-containing substance is sulfur, high-sulfur concentrate, etc.

[0022] Furthermore, in step (5), the reduction roasting temperature is 520-560°C, and the reduction roasting time is 3-5 hours.

[0023] Furthermore, in step (5), the reducing roasting flue gas is subjected to gravity dust removal, electrostatic dust removal, dry bag filter arsenic collection, wet purification, and a two-conversion two-absorption process to produce industrial sulfuric acid.

[0024] Not only is arsenic effectively recovered, solving the technical problem of producing highly toxic gases such as arsenic oxide, which makes production difficult in traditional processes, but it can also produce industrial sulfuric acid.

[0025] Further, in step (6), the sulfuric acid concentration of the grinding slurry is 30-50 wt%, the slurry concentration of the grinding slurry is 20-40 wt%, the acid leaching temperature is 60-80℃, and the acid leaching time is 4-6 hours.

[0026] Furthermore, in step (6), the filtrate is treated with a sulfidation method to recover valuable metals such as copper.

[0027] Furthermore, in step (7), the oxidation calcination temperature is 610-630°C, and the oxidation calcination time is 1-3 hours.

[0028] Furthermore, the oxidative roasting flue gas obtained in step (7) is transported by a blower to the fifth-stage reduction roasting in step (5) for synergistic treatment.

[0029] The oxidative roasting process converts acidic substances into sulfur dioxide and sulfur trioxide, which are then recycled back to the reduction roasting process. This reduces the impact of acidic substances on subsequent cyanide leaching, decreases the amount of alkali used, lowers costs, and increases the gold recovery rate.

[0030] Furthermore, in step (8), the concentration of sodium cyanide is 0.30 to 0.50 wt%, and the cyanide leaching time is 50 to 80 hours.

[0031] It can yield cyanide tailings containing 0.5–1.50 g / t of gold and 2.0–6.0 g / t of silver, which can be used as raw materials for building materials and cement production.

[0032] Furthermore, in step (8), the cyanide solution is replaced with zinc powder to obtain gold mud containing 30-70 wt% gold, which is then smelted to obtain gold ingots and silver ingots.

[0033] The beneficial effects of this invention are as follows:

[0034] This invention provides a method for the comprehensive recovery of valuable elements in complex gold concentrate resources. The entire process is simple and smooth, achieving efficient recovery of valuable elements and comprehensive utilization of resources in arsenic-carbon gold concentrate. The total gold and silver recovery rate reaches over 98%, greatly improving the economic benefits of enterprises. Detailed Implementation

[0035] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0036] Example 1:

[0037] A method for comprehensive recovery of valuable elements from complex gold concentrate resources includes the following steps:

[0038] (1) Preparation of primary cyanide lean liquor: The arsenic-containing carbon gold concentrate is adjusted with copper-containing materials. The composition of the arsenic-containing carbon gold concentrate is: gold 20g / t, silver 20g / t, copper 0.10wt%, sulfur 5wt%, arsenic 1wt%, carbon 1wt%, and the amount of copper-containing materials added is 2wt% of the arsenic-containing carbon gold concentrate. The slurry concentration is adjusted to 15wt% using cyanide system lean liquor with added ammonia water. The amount of ammonia water used is 3kg / t to obtain primary slurry.

[0039] (2) Secondary pre-cyanidation gold extraction: The sodium cyanide concentration of the primary slurry obtained in step (1) is controlled at 0.20 wt%, and the leaching time is 24 hours to obtain cyanidation system lean liquor I and cyanidation gold extraction slurry. The gold content of cyanidation system lean liquor I is controlled at 0.03 mg / L. The cyanidation gold extraction slurry enters the next process. Cyanidation system lean liquor I is returned to step (1) as cyanidation system lean liquor for slurry preparation.

[0040] (3) Three-stage flotation enrichment of gold-loaded carbon: kerosene is used as the collector, with a kerosene dosage of 300 g / t. The process involves one roughing, two scavenging, and two cleaning stages to obtain gold-loaded carbon concentrate froth and tailings slurry. The gold grade of the gold-loaded carbon concentrate reaches 1 kg / t. Gold ingots are produced by pyrometallurgical smelting. After flotation, the tailings slurry is filtered to obtain flotation tailings filter cake and cyanide system lean liquor II. The main components of the tailings filter cake are gold 10 g / t, silver 10 g / t, copper 0.10 wt%, sulfur 5 wt%, arsenic 1 wt%, and carbon 0.1 wt%. It is then processed in the next step. Cyanide system lean liquor II can be returned to step (1) as cyanide system lean liquor for preparing slurry.

[0041] (4) Four-stage copper slurry preparation: Add copper-containing materials to the tailings filter cake. The copper-containing materials are: 2wt% copper, so that the copper content of the raw material reaches 1wt%. Add high-sulfur concentrate to make the sulfur content reach 20wt%. Add water to adjust the slurry concentration to 65wt%.

[0042] (5) Five-stage reduction roasting: The slurry obtained in step (4) is stirred evenly and sprayed into a first-stage fluidized bed roasting furnace. The temperature is controlled at 520℃ for low-temperature reduction roasting for 3 hours. The roasting flue gas is processed by gravity dust removal, electrostatic dust removal, dry bag filter arsenic collection, wet purification, and two-stage conversion and two-stage absorption process to produce industrial sulfuric acid. The reduced roasted sand is then processed for the next step.

[0043] (6) Six-stage grinding and acid leaching treatment: The reduced roasted sand obtained in step (5) is ground to a fineness of -400 mesh 80% to obtain grinding slurry. Then, the sulfuric acid concentration of the grinding slurry is controlled to be 30wt%. The concentration of the acid leaching slurry after grinding is 20wt%, the acid leaching temperature is 60℃, and the acid leaching time is 4 hours. After acid leaching, the filter is filtered by blowing and washing filter press to obtain gold-containing filter cake and filtrate. The filtrate is used to comprehensively recover valuable metals such as copper by sulfidation. The composition of the gold-containing filter cake is: 20g / t, copper 0.02wt%, arsenic 0.10wt%, silver 20g / t, sulfur 0.10wt%. The gold-containing filter cake is then processed in the next step.

[0044] (7) Seven-stage steel strip furnace roasting: The gold-containing filter cake obtained in step (6) is transported to an electrically heated steel strip furnace. The furnace is controlled to be in an oxidizing atmosphere and the temperature is controlled at 610℃ for electric heating oxidation roasting. After roasting for 1 hour, the trace dust and sulfur dioxide flue gas discharged from the steel strip furnace is transported to the five-stage reduction roasting co-processing step (5) by a fan. The oxidized roasted sand produced by the steel strip furnace enters the next step of processing.

[0045] (8) Eight-stage cyanide gold extraction: The oxidized roasted sand obtained in step (7) is slurryed and the slurry concentration is controlled at 30wt%. Ammonia water is used to adjust the pH to 9, and the amount of ammonia water is 5kg / t. The ore is ground to -400 mesh 95% by ball mill. Sodium cyanide is added and the sodium cyanide concentration is controlled at 0.30wt%. The cyanide leaching time is 50 hours. The cyanide solution is replaced with zinc powder to obtain gold mud containing 30-70wt% gold. After smelting, gold ingots and silver ingots are obtained. The tailings after cyanide contain 0.5g / t of gold and 2.0g / t of silver, which are used as raw materials for building materials and cement production.

[0046] Example 2:

[0047] A method for comprehensive recovery of valuable elements from complex gold concentrate resources includes the following steps:

[0048] (1) Primary cyanide lean liquor preparation: The arsenic-containing carbon gold concentrate is adjusted and configured with copper-containing materials. The composition of the arsenic-containing carbon gold concentrate is: gold 40g / t, silver 110g / t, copper 0.30wt%, sulfur 10wt%, arsenic 3wt%, carbon 3wt%. The amount of copper-containing materials added is 3wt% of the arsenic-containing carbon gold concentrate. The cyanide system lean liquor with added ammonia is used to adjust the slurry concentration to 20wt%. The amount of ammonia is 4kg / t, and the primary slurry is obtained.

[0049] (2) Secondary pre-cyanidation gold extraction: The sodium cyanide concentration of the primary slurry obtained in step (1) is controlled at 0.25wt%, and the leaching time is 24 hours to obtain cyanidation system lean liquor I and cyanidation gold extraction slurry. The gold content of cyanidation system lean liquor I is controlled at 0.045mg / l. The cyanidation gold extraction slurry enters the next process. Cyanidation system lean liquor I is returned to step (1) as cyanidation system lean liquor for slurry preparation.

[0050] (3) Three-stage flotation enrichment of gold-loaded carbon: kerosene is used as the collector, with a kerosene dosage of 450 g / t. The process involves one roughing, two scavenging, and two cleaning stages to obtain gold-loaded carbon concentrate froth and tailings slurry. The gold grade of the gold-loaded carbon concentrate reaches 5.50 kg / t. Gold ingots are produced by pyrometallurgical smelting. After flotation, the tailings slurry is filtered to obtain flotation tailings filter cake and cyanide system lean liquor II. The main components of the tailings filter cake are gold 20 g / t, silver 20 g / t, copper 0.30 wt%, sulfur 10 wt%, arsenic 3 wt%, and carbon 0.3 wt%. It is then processed in the next step. Cyanide system lean liquor II can be returned to step (1) as cyanide system lean liquor for preparing slurry.

[0051] (4) Four-stage copper slurry preparation: Add copper-containing materials to the tailings filter cake. The copper-containing materials contain 26 wt% copper, so that the copper content of the raw material reaches 2.5 wt%. Add high-sulfur concentrate to make the sulfur content reach 23 wt%. Add water to adjust the slurry concentration to 67 wt%.

[0052] (5) Five-stage reduction roasting: The slurry obtained in step (4) is stirred evenly and sprayed into a first-stage fluidized bed roasting furnace. The temperature is controlled at 540℃ for low-temperature reduction roasting for 4 hours. The roasting flue gas is processed by gravity dust removal, electrostatic dust removal, dry bag filter arsenic collection, wet purification, and two-stage conversion and two-stage absorption process to produce industrial sulfuric acid. The reduced roasted sand is then processed for the next step.

[0053] (6) Six-stage grinding and acid leaching treatment: The reduced roasted sand obtained in step (5) is ground to a fineness of -400 mesh 85% to obtain grinding slurry. Then, the sulfuric acid concentration of the grinding slurry is controlled to be 40wt%. The concentration of the acid leaching slurry after grinding is 30wt%, the acid leaching temperature is 70℃, and the acid leaching time is 5 hours. After acid leaching, the filter is filtered by blowing and washing filter press to obtain gold-containing filter cake and filtrate. The filtrate is used to comprehensively recover valuable metals such as copper by sulfidation. The composition of the gold-containing filter cake is: 40g / t, copper 0.04wt%, arsenic 0.20wt%, silver 40g / t, sulfur 0.20wt%. The gold-containing filter cake is then processed in the next step.

[0054] (7) Seven-stage steel strip furnace roasting: The gold-containing filter cake obtained in step (6) is transported to an electrically heated steel strip furnace. The furnace is controlled to be in an oxidizing atmosphere and the temperature is controlled at 620°C for electric heating oxidation roasting. After roasting for 2 hours, the trace dust and sulfur dioxide flue gas discharged from the steel strip furnace is transported to the five-stage reduction roasting co-processing step (5) by a fan. The roasted sand produced by the steel strip furnace enters the next step of processing.

[0055] (8) Eight-stage cyanide gold extraction: The oxidized roasted sand obtained in step (7) is slurryed and the slurry concentration is controlled at 35wt%. The pH is adjusted to 9.5 with ammonia water at a dosage of 6kg / t. The ore is ground to 96.5% of -400 mesh using a ball mill. Sodium cyanide is added to control the sodium cyanide concentration at 0.40wt%. The cyanide leaching time is 65 hours. The cyanide solution is replaced with zinc powder to obtain gold mud containing 50wt% gold. Gold ingots and silver ingots are obtained by smelting. The tailings after cyanide contain 1.0g / t of gold and 4.0g / t of silver, which are used as raw materials for building materials and cement production.

[0056] Example 3:

[0057] A method for comprehensive recovery of valuable elements from complex gold concentrate resources includes the following steps:

[0058] (1) Primary cyanide lean liquor preparation: The gold concentrate containing arsenic carbon is adjusted and prepared with copper-containing materials. The composition of the gold concentrate containing arsenic carbon is: gold 60g / t, silver 200g / t, copper 0.50wt%, sulfur 15wt%, arsenic 5wt%, carbon 5wt%. The amount of copper-containing materials added is 5wt% of the gold concentrate containing arsenic carbon. The slurry concentration is adjusted to 25wt% using a cyanide system lean liquor with added ammonia. The amount of ammonia is 5kg / t, and the primary slurry is obtained.

[0059] (2) Secondary pre-cyanidation gold extraction: The sodium cyanide concentration of the primary slurry obtained in step (1) is controlled at 0.30 wt%, and the leaching time is 24 hours to obtain cyanidation system lean liquor I and cyanidation gold extraction slurry. The gold content of cyanidation system lean liquor I is controlled at 0.06 mg / L. The cyanidation gold extraction slurry enters the next process. Cyanidation system lean liquor I is returned to step (1) as cyanidation system lean liquor for slurry preparation.

[0060] (3) Three-stage flotation enrichment of gold-loaded carbon: kerosene is used as the collector, with a kerosene dosage of 600 g / t. The process involves one roughing, two scavenging, and two cleaning stages to obtain gold-loaded carbon concentrate froth and tailings slurry. The gold-loaded carbon concentrate has a gold grade of 10 kg / t and is smelted by pyrometallurgy to produce gold ingots. The tailings slurry is filtered to obtain tailings filter cake and cyanide system lean liquor II. The main components of the tailings filter cake are gold 30 g / t, silver 30 g / t, copper 0.50 wt%, sulfur 15 wt%, arsenic 5 wt%, and carbon 0.5 wt%. Cyanide system lean liquor II can be returned to step (1) as cyanide system lean liquor for preparing slurry.

[0061] (4) Four-stage copper slurry preparation: Add copper-containing materials to the tailings filter cake. The copper-containing material composition is: 50wt% copper, so that the copper content of the raw material reaches 4wt%; add high-sulfur concentrate to make the sulfur content reach 25wt%; add water to adjust the slurry concentration to 70wt%.

[0062] (5) Five-stage reduction roasting: The slurry obtained in step (4) is stirred evenly and sprayed into a first-stage fluidized bed roasting furnace. The temperature is controlled at 560℃ for low-temperature reduction roasting for 5 hours. The roasting flue gas is processed by gravity dust removal, electrostatic dust removal, dry bag filter arsenic collection, wet purification, and two-stage conversion and two-stage absorption process to produce industrial sulfuric acid. The reduced roasted sand is then processed for the next step.

[0063] (6) Six-stage grinding and acid leaching treatment: The reduced roasted sand obtained in step (5) is ground to a fineness of -400 mesh 90% to obtain grinding slurry. Then, the sulfuric acid concentration of the grinding slurry is controlled to be 50wt%. The concentration of the acid leaching slurry after grinding is 40wt%, the acid leaching temperature is 80℃, and the acid leaching time is 6 hours. After acid leaching, the filter is filtered by blowing and washing filter press to obtain gold-containing filter cake and filtrate. The filtrate is used to comprehensively recover valuable metals such as copper by sulfidation. The composition of the gold-containing filter cake is: 60g / t, copper 0.06wt%, silver 0.30wt%, silver 20~60g / t, sulfur 0.10~0.30wt%. The gold-containing filter cake is then processed in the next step.

[0064] (7) Seven-stage steel strip furnace roasting: The gold-containing filter cake obtained in step (6) is transported to an electrically heated steel strip furnace. The furnace is controlled to be in an oxidizing atmosphere and the temperature is controlled at 630°C for electric heating oxidation roasting. After roasting for 3 hours, the trace dust and sulfur dioxide flue gas discharged from the steel strip furnace is transported to the five-stage reduction roasting co-processing step (5) by a fan. The oxidized roasted sand produced by the steel strip furnace enters the next step of processing.

[0065] (8) Eight-stage cyanide gold extraction: The oxidized roasted sand obtained in step (7) is slurryed and the slurry concentration is controlled at 40wt%. Ammonia water is used to adjust the pH to 10, and the amount of ammonia water is 7kg / t. The ore is ground to -400 mesh 98% by ball mill. Sodium cyanide is added to control the sodium cyanide concentration at 0.50wt%. The cyanide leaching time is 80 hours. The cyanide solution is replaced with zinc powder to obtain gold mud containing 70wt% gold. Gold ingots and silver ingots are obtained by smelting. The tailings after cyanide contain 1.50g / t of gold and 6.0g / t of silver, which are used as raw materials for building materials and cement production.

[0066] Therefore, the method for comprehensive recovery of valuable elements in complex gold concentrate resources provided by this invention has a simple and smooth process flow, realizing the efficient recovery of valuable elements in arsenic-carbon gold concentrate and the comprehensive utilization of resources. The total gold and silver recovery rate reaches more than 98%, which greatly improves the economic benefits of enterprises.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for comprehensive recovery of valuable elements from complex gold concentrate resources, characterized in that, Includes the following steps: (1) Primary cyanide lean liquor preparation: The copper-containing material is used to adjust the configuration of the arsenic-containing carbon gold concentrate. The cyanide system lean liquor with added ammonia is used to adjust the slurry concentration to 15~25wt%, and the amount of ammonia is 3~5kg / t to obtain the primary slurry; (2) Secondary pre-cyanidation gold extraction: The sodium cyanide concentration of the primary slurry obtained in step (1) is controlled to carry out the cyanidation leaching process, and the lean liquor of the cyanidation system and the cyanidation gold extraction slurry are obtained; (3) Three-stage flotation enrichment of gold-loaded carbon: Add a collector to the cyanide gold extraction slurry obtained in step (2) and carry out a process of roughing, scavenging and cleaning to obtain gold-loaded carbon concentrate froth and tailings slurry; the tailings slurry is filtered to obtain tailings filter cake and cyanide system lean liquor II. (4) Fourth-grade copper slurry preparation: Add copper-containing materials to the tailings filter cake obtained in step (3) to make the copper content reach 1~4wt%, add sulfur-containing substances to make the sulfur content reach 20~25wt%, and adjust the slurry concentration with water to 65~70wt% to obtain the fourth-grade slurry. (5) Five-stage reduction roasting: The four-stage slurry obtained in step (4) is stirred evenly and then reduced roasting is carried out to obtain reduction roasting flue gas and reduction roasted sand; (6) Six-stage grinding and acid leaching treatment: The reduced roasted sand obtained in step (5) is ground to a fineness of -400 mesh 80~90% to obtain a grinding slurry. Then, the sulfuric acid concentration and slurry concentration of the grinding slurry are controlled for acid leaching treatment. Finally, the slurry is filtered to obtain a gold-bearing filter cake and filtrate. The sulfuric acid concentration of the grinding slurry is 30~50wt%, and the slurry concentration of the grinding slurry is 20~40wt%. The acid leaching temperature is 60~80℃, and the acid leaching time is 4~6 hours. (7) Seven-stage steel strip furnace roasting: The gold-containing filter cake obtained in step (6) is transported to an electrically heated steel strip furnace for electric heating oxidation roasting to obtain oxidation roasting flue gas and oxidation roasted sand; the obtained oxidation roasting flue gas is transported to step (5) by a blower for co-processing; (8) Eight-stage cyanide gold extraction: The oxidized roasted sand obtained in step (7) is slurryed and the slurry concentration is controlled at 30~40wt%. Ammonia water is used to adjust the pH to 9~10. Then, the ore is ground to -400 mesh 95~98%. Sodium cyanide is added for cyanide leaching, where the concentration of sodium cyanide is 0.30~0.50wt% and the cyanide leaching time is 50~80 hours, to obtain cyanide solution and cyanide tailings.

2. The method for comprehensive recovery of valuable elements from complex gold concentrate resources according to claim 1, characterized in that, In step (2), the sodium cyanide concentration is controlled at 0.20~0.30wt%, and the cyanide leaching time is 20~28 hours.

3. The method for comprehensive recovery of valuable elements from complex gold concentrate resources according to claim 1, characterized in that, In step (3), the collector is kerosene, and the amount of kerosene used is 300~600g / t.

4. The method for comprehensive recovery of valuable elements from complex gold concentrate resources according to claim 1, characterized in that, In step (5), the reduction roasting temperature is 520~560℃ and the reduction roasting time is 3~5 hours.

5. The method for comprehensive recovery of valuable elements from complex gold concentrate resources according to claim 4, characterized in that, In step (5), the reducing roasting flue gas is processed through gravity dust removal, electrostatic dust removal, dry bag filter arsenic collection, wet purification, and a two-stage conversion and two-stage absorption process to produce industrial sulfuric acid.

6. The method for comprehensive recovery of valuable elements from complex gold concentrate resources according to claim 1, characterized in that, In step (7), the oxidation calcination temperature is 610~630℃ and the oxidation calcination time is 1~3 hours.

7. The method for comprehensive recovery of valuable elements from complex gold concentrate resources according to claim 1, characterized in that, In step (8), the cyanide solution is replaced with zinc powder to obtain gold mud containing 30-70 wt% gold, which is then smelted to obtain gold ingots and silver ingots.