Multi-stage circulating gold extraction method for high-carbon-arsenic-sulfur gold and silver concentrate

Abstract

The invention belongs to the technical field of metallurgy, and relates to a multi-stage circulation gold extraction method for high-carbon-arsenic-sulfur gold and silver concentrate, which comprises the following steps: (1) grinding and oxidizing; (2) direct cyanidation; (3) roasting and oxidizing; (4) leaching gold with acid; and (5) cyaniding and gold leaching. The direct cyanidation-roasting oxidation-cyanidation gold extraction process is provided for the micro-dip dyeing type carbon-containing, high-arsenic and high-sulfur difficult-to-treat gold and silver concentrate, gold and silver dissociated from monomers are recycled through the first-stage direct cyanidation process, sulfide wrapping gold and carbonaceous matter wrapping gold are thoroughly oxidized through the second-stage roasting oxidation process, and gold and silver are separated from the gold and silver through the first-stage direct cyanidation process. And in the third stage, high-acid acid leaching-cyaniding is adopted to extract gold and silver, the problem of gold extraction of carbon-containing, high-arsenic and high-sulfur triple difficult-to-treat gold and silver concentrate is solved, and the method has the advantages of being high in gold and silver recovery rate, high in production efficiency, low in comprehensive cost, easy to industrialize, short in production period, environmentally friendly and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy and relates to a method for multi-stage circulation gold extraction from high-carbon arsenic-sulfur gold-silver concentrate. Background Art

[0002] With the increasing depletion of easily-processed gold mines, extracting gold from difficult-to-process gold mines has become an important source of gold in the future. However, the gold in difficult-to-process gold mines is mostly fine-grained impregnated gold, which is wrapped by sulfides mainly including pyrite and arsenopyrite, and most of them contain harmful impurities such as arsenic and organic carbon. The sulfur content in some gold mines is very high. At present, the treatment of such difficult-to-process gold ores mainly adopts the process of fine grinding and flotation of raw ore-gold concentrate oxidation-cyanidation gold extraction. The sulfides therein are oxidized to dissociate the wrapped gold, and then the gold is extracted by processes such as cyanide carbon leaching and cyanide carbon slurry. The oxidation methods currently used in industry mainly include biological oxidation, pressurized oxidation, and roasting oxidation.

[0003] Biological oxidation has the disadvantages of long operation cycle, incomplete oxidation, bacterial sensitivity to harmful ions such as arsenic, low gold leaching rate, etc. In addition, after oxidation, most of the impurities such as Fe, S, As, S in the gold concentrate enter the solution, resulting in high neutralization costs for the acidic oxidizing solution. When treating carbon-containing gold concentrate, it cannot solve the problem of "gold robbing" by organic carbon, affecting gold leaching.

[0004] However, when the sulfur content in the gold concentrate is higher than 40w%, it is difficult for bacteria to oxidize. Even if it can be oxidized, there are still problems such as high acidity of the oxidation solution and high neutralization cost. Biological oxidation is generally suitable for treating gold concentrates containing 10w% to 20w% sulfur, and pressurized oxidation is suitable for treating gold concentrates containing 3w% to 15w% sulfur. For materials with a sulfur content greater than 20w%, measures such as reducing the slurry concentration, cooling, and returning the oxidation slag should be taken. Experiments have shown that roasting oxidation treatment of such ores has low gold cyanide leaching, serious environmental pollution, and high processing costs.

[0005] Chinese invention patent CN101285126A discloses a low-pollution and high-recovery process for extracting gold from difficult-to-treat gold concentrates, and Chinese invention patent CN101314818A discloses a process for extracting gold from biologically oxidized gold concentrates, both of which are combined processes of wet method followed by pyrolysis, and have the problems of high cost and difficulty in industrialization. A Brazilian company oxidizes part of the flotation concentrate with oxygen in an autoclave, and the other part is bio-oxidized at normal pressure, and the gold concentrate after bio-oxidation is combined with the feed of the autoclave and then fed into the autoclave circuit for pressurized oxidation. The gold concentrate of this process has to undergo two pressurized oxidations, which has the problems of complex process and high oxidation cost. In addition, the sulfur content of the gold concentrate treated by the process is low (18.7w%), the gold is mainly wrapped in arsenopyrite, and does not contain organic carbon. The oxidation slag is extracted by carbon leaching, which has the disadvantages of large loss of activated carbon.

[0006] The above processes do not involve the gold extraction process of the triple-difficult-to-process gold and silver concentrate containing carbon, high arsenic and high sulfur. Therefore, how to provide a process that can simultaneously process the triple-difficult-to-process gold concentrate containing carbon, high arsenic and high sulfur is a technical problem that needs to be solved urgently. Summary of the invention

[0007] In view of the deficiencies of the above-mentioned prior art, the present invention provides a method for multi-stage circulation gold extraction from high-carbon arsenic-sulfur gold-silver concentrate, and the specific technical scheme is as follows:

[0008] A method for multi-stage circulation gold extraction from high-carbon arsenic-sulfur gold-silver concentrate, comprising the following steps:

[0009] (1) Grinding and oxidation: Grinding the high carbon arsenic sulfur gold and silver concentrate with a grinding concentration of 60-65w%, adding potassium permanganate and hydrogen peroxide during grinding, performing oxidation treatment after grinding, and filtering to obtain an oxidized gold and silver concentrate filter cake;

[0010] (2) Direct cyanidation: the filter cake of the oxidized gold and silver concentrate obtained in step (1) is slurried to a pulp concentration of 20w% to 40w%, and the pH is adjusted to 8-10, and sodium cyanide is added for primary leaching to obtain primary leaching residue and primary leaching liquid; then the primary leaching residue is subjected to secondary grinding and leaching, and sodium cyanide is added during grinding to obtain secondary leaching residue and secondary leaching liquid; the primary leaching liquid and the secondary leaching liquid are mixed and then zinc powder replacement is performed to recover gold and silver;

[0011] (3) roasting and oxidation: adding water to the secondary leaching residue obtained in step (2) to adjust the slurry to a mineral concentration of 60-70w%, adding concentrated sulfuric acid and stirring, and then entering a first-stage reduction roasting furnace for roasting to obtain reduced roasted sand; the reduced roasted sand enters a second-stage oxidation roasting furnace for roasting to produce flue gas and oxidized roasted sand;

[0012] (4) Acid leaching for gold: The oxidized roasted sand produced in step (3) is slurried with a sulfuric acid solution to 30-40w%, and sodium chlorate and sodium chloride are added for acid leaching to obtain an acid leaching solution and an acid leaching residue; the acid leaching solution is adsorbed with gold-adsorbing activated carbon to obtain gold-loaded carbon;

[0013] (5) Cyanide gold leaching: The acid leaching residue produced in step (4) is slurried to a pulp concentration of 30-35w%, and sodium hydroxide, ammonium sulfate, ammonium persulfate and sodium cyanide are added, and a secondary leaching and secondary washing process is adopted to obtain a leachate and a leachate residue, and the leachate is replaced by zinc powder to recover gold and silver.

[0014] The method for multi-stage circulation gold extraction of high-carbon arsenic-sulfur gold-silver concentrate of the present invention provides a direct cyanidation-roasting oxidation-cyanidation gold extraction process for fine impregnation type carbon-containing, high-arsenic, high-sulfur and difficult-to-treat gold-silver concentrate, firstly utilizes a first-stage direct cyanidation process to recover gold and silver in monomer dissociation, then utilizes a second-stage roasting oxidation process to thoroughly oxidize sulfide to encapsulate gold, and carbonaceous materials to encapsulate gold, so that gold and silver are further dissociated, and a third-stage high-acid acid leaching-cyanidation is used to extract gold and silver, and the leaching rate of gold and silver reaches more than 98%, with remarkable effect.

[0015] In the multi-stage circulation gold extraction process of high-carbon arsenic-sulfur gold-silver concentrate of the present invention, the high-carbon arsenic-sulfur gold-silver concentrate contains 2-5w% carbon, 1-3w% arsenic, 20-30w% sulfur, 30-50g / t gold, and 600-800g / t silver; the secondary leaching slag obtained in step (2) contains 5-10g / t gold, 60-80g / t silver, 20-30w% sulfur, 1-3w% arsenic, and 2-5w% carbon; the flue gas produced by roasting in step (3) contains 4-6v% sulfur dioxide, and industrial sulfuric acid products are produced through an acid production process; the oxidized roasted sand produced by roasting contains 5-10g / t gold, 60-80g / t silver, 20-30w% sulfur, 1-3w% arsenic, and 2-5w% carbon; the flue gas produced by roasting in step (3) contains 4-6v% sulfur dioxide, and an industrial sulfuric acid product is produced through an acid production process; the oxidized roasted sand produced by roasting contains 4-6v% sulfur dioxide, and the industrial sulfuric acid product is produced through an acid production process; the oxidized roasted sand produced by roasting contains 4-6v% sulfur dioxide, and the industrial sulfuric acid product is produced through an acid production process; the industrial sulfuric acid product is produced by the industrial sulfuric ... The invention discloses a method for preparing the present invention, wherein the acid leaching slag contains 5 to 7 g / t of gold, 50 to 100 g / t of silver, 0.02 to 0.04 w% of arsenic, 0.5 to 0.8 w% of sulfur, 0.5 to 0.7 w% of arsenic and 0.1 to 0.12 w% of carbon; the acid leaching leaching solution of the step (4) is adsorbed by gold adsorption activated carbon to obtain a leaching slag containing 3000 to 5000 g / t of gold; the obtained acid leaching slag contains 5 to 7 g / t of gold, 50 to 100 g / t of silver and 0.02 to 0.04 w% of arsenic; the leaching slag of the step (5) contains 0.5 to 1.0 g / t of gold and 5 to 10 g / t of silver; the leaching rate of gold and silver reaches more than 98%, and the effect is remarkable.

[0016] Furthermore, in step (1), the grinding particle size is -0.037 mm accounting for 90% to 95%.

[0017] Furthermore, in the step (1), the amount of potassium permanganate used is 1-2 kg / t, and the amount of hydrogen peroxide used is 1-2 kg / t.

[0018] Furthermore, in step (1), the air volume during oxidation treatment is 20 to 30 m 3 / h, oxidation temperature 60-80℃, oxidation time 6-8h.

[0019] Furthermore, in the step (2), the sodium cyanide concentration during the first leaching is 2.0-2.5w%, the leaching temperature is 50-60°C, and the air volume is 20-30m 3 / h, stirring speed 500-600r / min, leaching 6-8h.

[0020] Furthermore, in the step (2), during the secondary grinding and leaching grinding, the amount of sodium cyanide added is 10-20 kg / t, the grinding temperature is 50-60° C., the grinding time is 10-20 min, and after the secondary grinding, the leaching time is 6-8 h.

[0021] Furthermore, in step (3), the amount of concentrated sulfuric acid added is 50 to 100 kg / t, and the stirring time is 3 to 5 hours.

[0022] Furthermore, in the step (3), the roasting temperature of the first-stage reduction roasting furnace is 550-600° C., and the roasting time is 2-4 hours; the roasting temperature of the second-stage oxidation roasting furnace is 700-750° C., and the roasting time is 2-3 hours.

[0023] Furthermore, in the step (4), the acid leaching temperature is 80-90° C., the amount of sodium chlorate is 30-50 kg / t, the amount of sodium chloride is 30-50 kg / t, and the leaching time is 3-5 h.

[0024] Furthermore, in the step (5), the amount of sodium hydroxide is 10-20 kg / t, the amount of ammonium sulfate is 5-10 kg / t, the amount of ammonium persulfate is 1-3 kg / t, the amount of sodium cyanide is 5-10 kg / t, the leaching temperature is 50-60° C., and the leaching time is 10-20 h.

[0025] The beneficial effects of the present invention are:

[0026] The method for multi-stage circulation gold extraction from high-carbon arsenic-sulfur gold-silver concentrates of the present invention solves the problem of gold extraction from gold-silver concentrates that are difficult to treat with carbon, high arsenic and high sulfur, and has the advantages of high gold and silver recovery rate, high production efficiency, low comprehensive cost, easy industrialization, short production cycle, and environmental friendliness. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with embodiments. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] Embodiment 1:

[0029] A method for multi-stage circulation gold extraction from high-carbon arsenic-sulfur gold-silver concentrate, comprising the following steps:

[0030] (1) Grinding and oxidation: Grind the high carbon arsenic sulfur gold-silver concentrate containing 2w% carbon, 1w% arsenic, 20w% sulfur, 30g / t gold and 600g / t silver. The grinding concentration is 60w%, and the grinding particle size is -0.037mm, accounting for 90%. Potassium permanganate and hydrogen peroxide are added during the grinding process. The amount of potassium permanganate is 1kg / t, and the amount of hydrogen peroxide is 1kg / t. After grinding, the ore enters the stirring tank with an air volume of 20m 3 / h, oxidation temperature 60 ° C, oxidation time 6h, filtration to obtain the oxidized gold and silver concentrate filter cake.

[0031] (2) Direct cyanidation: The oxidized gold and silver concentrate filter cake is slurried to a pulp concentration of 20w%, soda ash is added to adjust the pH to 9, sodium cyanide is added, and the sodium cyanide concentration is controlled to 2.0w%, the leaching temperature is 50°C, and the air volume is 20m 3 / h, stirring speed 500r / min, primary leaching for 6h; the primary leaching residue is leached through secondary grinding, 10kg / t of sodium cyanide is added during the grinding process, the grinding temperature is 50°C, the grinding time is 10min, and after the secondary grinding, the leaching time is 6h; the primary leaching solution is mixed with the secondary leaching solution and zinc powder is replaced to recover gold and silver. The secondary leaching residue contains 5g / t gold, 60g / t silver, 20w% sulfur, 1w% arsenic and 2w% carbon, and enters the next roasting and oxidation process.

[0032] (3) Roasting and oxidation: add water to the secondary leaching slag to adjust the slurry to 60w% of ore concentration, add concentrated sulfuric acid, the amount of concentrated sulfuric acid is 50kg / t, the stirring time is 3h, and enter the first-stage reduction roasting furnace, the roasting temperature is 550℃, the reduction roasting time is 2h, the reduction roasted sand enters the second-stage oxidation roasting furnace, the roasting temperature is 700℃, the roasting time is 2h, the roasting output contains 4v% of sulfur dioxide flue gas, and the industrial sulfuric acid product is produced through the acid making process. The oxidized roasted sand containing 10g / t of gold, 80g / t of silver, 0.5w% of sulfur, 0.5w% of arsenic, and 0.1w% of carbon enters the next acid leaching gold process.

[0033] (4) Acid leaching for gold: The oxidized roasted sand is slurried to 30w% with 10w% sulfuric acid solution, the acid leaching temperature is 80°C, the amount of sodium chlorate is 30kg / t, the amount of sodium chloride is 30kg / t, the leaching time is 3h, and the acid leaching solution is adsorbed with gold adsorbing activated carbon to obtain gold-loaded carbon containing 3000g / t of gold; at the same time, the acid leaching slag containing 5g / t of gold, 50g / t of silver, and 0.02w% of arsenic is obtained, which enters the next step of cyanide gold extraction process.

[0034] (5) Cyanide gold leaching: The acid leaching residue was slurried to a pulp concentration of 30w%, and sodium hydroxide was added. The amount of sodium hydroxide was 10kg / t, the amount of ammonium sulfate was 5kg / t, the amount of ammonium persulfate was 1kg / t, and the amount of sodium cyanide was 5kg / t. The leaching temperature was 50°C, and a secondary leaching and secondary washing process was adopted. The leaching time was 10h. The leaching liquid was replaced with zinc powder to recover gold and silver. The leaching residue contained 0.5g / t gold and 5g / t silver. The leaching rates of gold and silver reached 98.20% and 98.10% respectively, with significant effects.

[0035] Embodiment 2:

[0036] A method for multi-stage circulation gold extraction from high-carbon arsenic-sulfur gold-silver concentrate, comprising the following steps:

[0037] (1) Grinding and oxidation: Grind the high carbon arsenic sulfur gold-silver concentrate containing 3.5w% carbon, 2w% arsenic, 25w% sulfur, 40g / t gold and 700g / t silver. The grinding concentration is 62.5w%, and the grinding particle size is -0.037mm, accounting for 92.5%. Potassium permanganate and hydrogen peroxide are added during the grinding process. The amount of potassium permanganate is 1.5kg / t, and the amount of hydrogen peroxide is 1.5kg / t. After grinding, the ore enters the stirring tank with an air volume of 25m 3 / h, oxidation temperature 70 ° C, oxidation time 7h, filtration to obtain the oxidized gold and silver concentrate filter cake.

[0038] (2) Direct cyanidation: The filter cake of the oxidized gold and silver concentrate is slurried to a pulp concentration of 30w%, and soda ash is added to adjust the pH to 9. Sodium cyanide is added to control the sodium cyanide concentration to 2.25w%, the leaching temperature is 55°C, and the air volume is 250m 3 / h, stirring speed 550r / min, primary leaching for 7h, the primary leaching residue is leached through secondary grinding, 15kg / t of sodium cyanide is added during the grinding process, the grinding temperature is 55°C, the grinding time is 15min, and after the secondary grinding, the leaching time is 7h; the primary leaching solution is mixed with the secondary leaching solution and zinc powder is replaced to recover gold and silver. The secondary leaching residue contains 7.5g / t of gold, 70g / t of silver, 25w% of sulfur, 2w% of arsenic, and 2.5w% of carbon, and enters the next roasting and oxidation process.

[0039] (3) Roasting and oxidation: add water to the secondary leaching slag to adjust the ore concentration to 65w%, add concentrated sulfuric acid, the amount of concentrated sulfuric acid is 75kg / t, and the stirring time is 4h. Enter the first-stage reduction roasting furnace, the roasting temperature is 575℃, the reduction roasting time is 3h, and the reduced roasted sand enters the second-stage oxidation roasting furnace, the roasting temperature is 725℃, and the roasting time is 2.5h. The roasting output contains 5v% sulfur dioxide in the flue gas, which is passed through the acid making process to produce industrial sulfuric acid products. The oxidized roasted sand containing 12.5g / t gold, 100g / t silver, 0.65w% sulfur, 0.6w% arsenic, and 0.11w% carbon enters the next acid leaching gold process.

[0040] (4) Acid leaching for gold: The oxidized roasted sand is slurried to 35w% with a 15w% sulfuric acid solution, the acid leaching temperature is 85°C, the amount of sodium chlorate is 40kg / t, the amount of sodium chloride is 40kg / t, the leaching time is 4h, and the acid leaching solution is adsorbed with gold adsorbing activated carbon to obtain a gold-loaded carbon containing 4000g / t of gold; at the same time, an acid leaching residue containing 6g / t of gold, 75g / t of silver, and 0.03w% of arsenic is obtained, which enters the next step of cyanide gold extraction process;

[0041] (5) Cyanide gold leaching: The acid leaching residue was slurried to a pulp concentration of 32.5w%, and sodium hydroxide was added. The amount of sodium hydroxide was 15kg / t, the amount of ammonium sulfate was 7.50kg / t, the amount of ammonium persulfate was 2kg / t, and the amount of sodium cyanide was 7.5kg / t. The leaching temperature was 55°C, and a secondary leaching and secondary washing process was adopted. The leaching time was 15h. The leaching liquid was replaced with zinc powder to recover gold and silver. The leaching residue contained 0.75g / t gold and 7.5g / t silver. The leaching rates of gold and silver reached 98.30% and 98.20% respectively, with significant effects.

[0042] Embodiment 3:

[0043] A method for multi-stage circulation gold extraction from high-carbon arsenic-sulfur gold-silver concentrate, comprising the following steps:

[0044] (1) Grinding and oxidation: Grind the high carbon arsenic sulfur gold-silver concentrate containing 5w% carbon, 3w% arsenic, 30w% sulfur, 50g / t gold and 800g / t silver. The grinding concentration is 65w%, and the grinding particle size is -0.037mm, accounting for 95%. Potassium permanganate and hydrogen peroxide are added during the grinding process. The amount of potassium permanganate is 2kg / t, and the amount of hydrogen peroxide is 2kg / t. After grinding, the ore enters the stirring tank with an air volume of 30m 3 / h, oxidation temperature 80℃, oxidation time 8h, and filtration to obtain the oxidized gold and silver concentrate filter cake.

[0045] (2) Direct cyanidation: The oxidized gold and silver concentrate filter cake is slurried to a pulp concentration of 40w%, soda ash is added to adjust the pH to 9, sodium cyanide is added, and the sodium cyanide concentration is controlled to 2.5w%, the leaching temperature is 60℃, and the air volume is 30m 3 / h, stirring speed 600r / min, primary leaching for 8h, primary leaching residue after secondary grinding leaching, adding 20kg / t of sodium cyanide during grinding, grinding temperature 60℃, grinding time 20min, after secondary grinding, leaching time 8h; primary leaching and secondary leaching liquid are mixed and zinc powder is replaced to recover gold and silver, the secondary leaching residue contains 10g / t gold, 80g / t silver, 30w% sulfur, 3w% arsenic and 5w% carbon, and enters the next roasting oxidation process.

[0046] (3) Roasting and oxidation: add water to the secondary leaching slag to adjust the slurry to 70w% of ore concentration, add concentrated sulfuric acid, the amount of concentrated sulfuric acid is 100kg / t, and the stirring time is 5h. Enter the first-stage reduction roasting furnace, the roasting temperature is 600℃, the reduction roasting time is 4h, and the reduced roasted sand enters the second-stage oxidation roasting furnace, the roasting temperature is 750℃, and the roasting time is 3h. The roasting output contains 6v% of sulfur dioxide in the flue gas, which is passed through the acid making process to produce industrial sulfuric acid products. The oxidized roasted sand containing 15g / t of gold, 120g / t of silver, 0.8w% of sulfur, 0.7w% of arsenic, and 0.12w% of carbon enters the next acid leaching gold process.

[0047] (4) Acid leaching of gold: The oxidized roasted sand is slurried to 40w% with 20w% sulfuric acid solution, the acid leaching temperature is 90°C, the amount of sodium chlorate is 50kg / t, the amount of sodium chloride is 50kg / t, the leaching time is 5h, and the acid leaching solution is adsorbed with gold adsorbing activated carbon to obtain gold-loaded carbon containing 5000g / t of gold; at the same time, the acid leaching slag containing 7g / t of gold, 100g / t of silver, and 0.04w% of arsenic is obtained, which enters the next step of cyanide gold extraction process;

[0048] (5) Cyanide gold leaching: The acid leaching slag was slurried to a pulp concentration of 35w%, and sodium hydroxide was added. The amount of sodium hydroxide was 20kg / t, the amount of ammonium sulfate was 10kg / t, the amount of ammonium persulfate was 3kg / t, and the amount of sodium cyanide was 10kg / t. The leaching temperature was 60°C, and a secondary leaching and secondary washing process was adopted. The leaching time was 20h. The leaching liquid was replaced with zinc powder to recover gold and silver. The leaching slag contained 1.0g / t of gold and 10g / t of silver. The leaching rates of gold and silver reached 98.40% and 98.30% respectively, with significant effects.

[0049] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate, characterized in that: The steps include: (1) Grinding and oxidation: Grinding the high carbon arsenic sulfur gold and silver concentrate with a grinding concentration of 60-65w%, adding potassium permanganate and hydrogen peroxide during grinding, performing oxidation treatment after grinding, and filtering to obtain an oxidized gold and silver concentrate filter cake; (2) Direct cyanidation: the filter cake of the oxidized gold and silver concentrate obtained in step (1) is slurried to a pulp concentration of 20w% to 40w%, and the pH is adjusted to 8-10, and sodium cyanide is added for primary leaching to obtain primary leaching residue and primary leaching liquid; then the primary leaching residue is subjected to secondary grinding and leaching, and sodium cyanide is added during grinding to obtain secondary leaching residue and secondary leaching liquid; the primary leaching liquid and the secondary leaching liquid are mixed and then zinc powder replacement is performed to recover gold and silver; (3) roasting and oxidation: add water to the secondary leaching residue obtained in step (2) to adjust the slurry to a mineral concentration of 60-70w%, add concentrated sulfuric acid and stir, and then put it into a first-stage reduction roasting furnace for roasting to obtain reduced roasted sand; The reduced roasted sand enters the second-stage oxidation roasting furnace for roasting, and produces flue gas and oxidized roasted sand; (4) Acid leaching for gold: The oxidized roasted sand produced in step (3) is slurried with a sulfuric acid solution to 30-40w%, and sodium chlorate and sodium chloride are added for acid leaching to obtain an acid leaching solution and an acid leaching residue; the acid leaching solution is adsorbed with gold-adsorbing activated carbon to obtain gold-loaded carbon; (5) Cyanide gold leaching: The acid leaching residue produced in step (4) is slurried to a pulp concentration of 30-35w%, and sodium hydroxide, ammonium sulfate, ammonium persulfate and sodium cyanide are added, and a secondary leaching and secondary washing process is adopted to obtain a leachate and a leachate residue, and the leachate is replaced by zinc powder to recover gold and silver.

2. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 1, characterized in that: In the step (1), the grinding particle size is -0.037 mm, accounting for 90% to 95%.

3. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 2, characterized in that: In the step (1), the amount of potassium permanganate used is 1-2 kg / t, and the amount of hydrogen peroxide used is 1-2 kg / t.

4. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 3 is characterized in that: In the step (1), the air volume during the oxidation treatment is 20 to 30 m 3 / h, oxidation temperature 60-80℃, oxidation time 6-8h.

5. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 1, characterized in that: In the step (2), the sodium cyanide concentration during the first leaching is 2.0-2.5w%, the leaching temperature is 50-60°C, and the air volume is 20-30m 3 / h, stirring speed 500-600r / min, leaching 6-8h.

6. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 5, characterized in that: In the step (2), during the secondary grinding and leaching grinding, the amount of sodium cyanide added is 10-20 kg / t, the grinding temperature is 50-60° C., the grinding time is 10-20 min, and after the secondary grinding, the leaching time is 6-8 h.

7. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 1, characterized in that: In the step (3), the amount of concentrated sulfuric acid added is 50 to 100 kg / t, and the stirring time is 3 to 5 hours.

8. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 7, characterized in that: In the step (3), the roasting temperature of the first-stage reduction roasting furnace is 550-600° C., and the roasting time is 2-4 hours; the roasting temperature of the second-stage oxidation roasting furnace is 700-750° C., and the roasting time is 2-3 hours.

9. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 1, characterized in that: In the step (4), the acid leaching temperature is 80-90° C., the amount of sodium chlorate is 30-50 kg / t, the amount of sodium chloride is 30-50 kg / t, and the leaching time is 3-5 h.

10. The method for multi-stage circulation gold extraction from high carbon arsenic sulfur gold-silver concentrate according to claim 1, characterized in that: In the step (5), the amount of sodium hydroxide used is 10-20 kg / t, the amount of ammonium sulfate used is 5-10 kg / t, the amount of ammonium persulfate used is 1-3 kg / t, the amount of sodium cyanide used is 5-10 kg / t, the leaching temperature is 50-60° C., and the leaching time is 10-20 h.