Method for gradient extraction of gold, silver and antimony from arsenic-antimony-containing gold concentrate

Abstract

The invention belongs to the technical field of precious metal smelting, and relates to a method for stepwise extracting gold, silver and antimony from gold concentrate containing arsenic and antimony. S2, leaching antimony ore by a wet method; s3, oxidizing the antimony leaching solution to precipitate antimony; s4, antimony leaching tailings and antimony separation tailings are subjected to high-temperature reduction roasting; s5, carrying out high-acid acid leaching and impurity removal on the reduced roasting slag; and S6, gold and silver are recycled through pyrogenic process smelting of the acid leaching residues. The method for stepwise extracting gold, silver and antimony from the arsenic-antimony-containing gold concentrate is simple and easy to implement, stepwise efficient extraction and efficient recovery of gold, silver and antimony in the arsenic-antimony-containing gold concentrate are achieved through the integrated process technology of antimony flotation enrichment, antimony wet leaching, antimony leaching tailings and antimony separation tailings combined roasting treatment, acidizing treatment and smelting treatment, and the method is suitable for the gold-silver-antimony-containing gold concentrate with the arsenic content of 1.0-10.0 wt% and the antimony content of 1.0-10.0 wt%. The method is suitable for gold concentrates containing 1.0-10.0 wt% of antimony, and the total recovery rate of gold and silver reaches 98.5% or above.

Description

Technical Field

[0001] The invention belongs to the technical field of precious metal smelting, and in particular relates to a method for cascading extraction of gold, silver and antimony from arsenic-antimony gold concentrate. Background Art

[0002] Gold and silver are usually associated with minerals in the form of single elements. The main metal minerals are pyrite, arsenopyrite, etc., followed by galena, sphalerite, pyrrhotite, arsenopyrite, stibnite, etc.; non-metallic minerals are quartz, feldspar and carbonate minerals. Gold and silver are closely related to pyrite, arsenopyrite and stibnite, and generally form associated minerals. The main components of arsenopyrite are FeAsS, SiO 2 , Sb 2 S 3 And the trace elements such as gold and silver that accompany it.

[0003] At present, in the field of gold smelting, three pre-treatment processes are generally used for difficult-to-treat gold concentrates containing arsenic and antimony. The first is the two-stage boiling roasting process technology; the second is the hot pressing process technology; the third is the biological oxidation process technology. The two-stage boiling roasting process technology is an oxygen-deficient magnetization roasting technology. It is a gold and silver recovery process method for arsenic-containing gold concentrates invented on the basis of a domestic high-arsenic and high-sulfur gold concentrate removal technology. The two-stage boiling roasting process is a method for extracting gold and silver from low-sulfur, arsenic and antimony gold concentrates. The gold and silver recovery rate can only reach 80-85%, which still cannot achieve the purpose of significantly improving the gold and silver recovery rate, and the antimony in the gold concentrate is not recovered. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned prior art, the present invention provides a method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate. The specific technical scheme is as follows:

[0005] A method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate, comprising the following steps:

[0006] S1 flotation enrichment of antimony ore: add water to the arsenic-antimony-gold concentrate to adjust the slurry to 20-40wt%, add soda ash, sodium ferrocyanide and lead nitrate, grind the ore, stir for 2-10 hours, add butyl xanthate and 2# oil, carry out the first roughing, second scavenging and second concentrating process, and produce antimony ore and antimony tailings;

[0007] S2 Wet leaching of antimony ore: adding sodium hydroxide and sodium sulfide to the antimony ore, adjusting the slurry to a slurry concentration of 40-50wt%, stirring for 1-4h, and liquid-solid separation to obtain antimony leaching solution and antimony leaching tailings;

[0008] S3 Antimony leaching solution oxidation precipitation: The antimony leaching solution is filtered and purified, and hydrogen peroxide is used as an oxidizing agent. The mixture is stirred and oxidized for 3 to 6 hours, and liquid-solid separation is performed to obtain antimony mud and antimony oxidization precipitation filtrate;

[0009] S4 High-temperature reduction roasting of antimony leaching tailings and antimony selection tailings: After the antimony selection tailings and antimony leaching tailings are combined, the slurry is adjusted to 65-70wt% by using the antimony oxide precipitation filtrate, and then the slurry enters the reduction boiling furnace for reduction to obtain reduction roasting slag and flue gas;

[0010] S5 high acid leaching of reduced roasted slag to remove impurities: The reduced roasted slag is slurried with sulfuric acid solution to a mineral concentration of 10-50wt%, the temperature is controlled at 80-120°C, the acid leaching time is 12-24h, and liquid-solid separation is performed after acid leaching to obtain acid leaching slag;

[0011] S6 acid leaching slag pyrometallurgical smelting to recover gold and silver: the acid leaching slag is added into the pyrometallurgical copper smelting furnace to recover gold and silver.

[0012] The method for extracting gold, silver and antimony from arsenic-antimony gold concentrate in stages of the present invention comprises the following steps: step S1 is a flotation process for enriching antimony ore by flotation, which is beneficial to further improving the antimony grade of antimony ore, reducing the construction investment of wet leaching process, reducing the wet leaching processing volume and reducing the production cost; step S2 is a wet leaching process for antimony ore to improve the leaching effect of antimony ore; step S3 is an oxidation precipitation process for antimony, which uses hydrogen peroxide as an antimony precipitation reagent, and has the characteristics of complete precipitation of antimony and significant precipitation effect; step S4 is a high-temperature reduction roasting process, which can make the arsenic in the antimony leaching tailings and the antimony selection tailings The roasting of sulfur, carbon and other elements is more complete; the high-acid leaching and impurity removal in step S5 further eliminates the wrapping of gold and silver by low-melting-point oxides such as arsenate, iron oxide, antimony and lead in the roasting process, and at the same time further reduces the roasting slag, so that gold and silver are further efficiently enriched, providing the best favorable conditions for improving the recovery rate of gold and silver in pyrometallurgical smelting; step S6 enriches the gold and silver acid leaching slag and adds it to the copper smelting furnace to recover gold and silver, and precious metals such as gold and silver enter the copper and are then recycled, and the total recovery rate of gold and silver reaches more than 98.5%.

[0013] Furthermore, in step S1, the amount of soda ash added is 10-20 kg / t, the amount of sodium ferrocyanide added is 1-5 kg / t, and the amount of lead nitrate added is 100-300 g / t.

[0014] Furthermore, in step S1, grinding to a fineness of -0.037 mm accounts for 80-90%.

[0015] Furthermore, in the step S1, the amount of butyl xanthate added is 200-600 g / t, and the amount of 2# oil added is 10-100 g / t.

[0016] Furthermore, in step S2, the amount of sodium hydroxide added is 10-20 kg / t, and the amount of sodium sulfide added is 20-100 kg / t.

[0017] In step S2 of the present invention, the dosage of leaching reagents sodium hydroxide and sodium sulfide is controlled to effectively improve the leaching effect of antimony ore antimony, the leaching residue contains 0.10-0.30wt% antimony, the antimony leaching rate reaches more than 95%, and the inaccurate addition of leaching reagents is avoided, which causes the waste of reagents.

[0018] Furthermore, in step S2, a continuous washing filter is used for liquid-solid separation.

[0019] Furthermore, in step S3, the amount of hydrogen peroxide added is 10-50 kg / m 3 , the stirring speed is 800~1000r / min.

[0020] Furthermore, in step S4, the temperature of the reduction boiling furnace is 750-900° C., and the excess air coefficient is controlled at 0.8-1.0.

[0021] The invention controls the high-temperature reduction roasting at 750-900°C, and can roast the arsenic, sulfur, carbon and other elements in the antimony leaching tailings and the antimony selection tailings more completely, breaking the problem that the arsenic and sulfur removal effect is poor and the gold and silver are still partially wrapped in pyrite, pyrrhotite, arsenopyrite and stibnite under the conditions of the first-stage roasting temperature of 550-580°C and the second-stage roasting temperature of 600-650°C in the conventional two-stage roasting process; the blower is controlled to be stable, and the oxygen-deficient roasting is maintained, so that most of the arsenic is oxidized into arsenic trioxide, which enters the flue gas in the form of gas, and all the sulfur is converted into SO 2 It enters the flue gas in the form of arsenic trioxide and industrial sulfuric acid.

[0022] Furthermore, in step S4, the flue gas is subjected to flue gas dry dust removal, electrostatic dust removal, arsenic collection by quenching, wet purification, electrostatic demisting, and conversion dry absorption process to recover arsenic trioxide and industrial sulfuric acid.

[0023] Furthermore, in step S5, the concentration of sulfuric acid is 10-70wt%.

[0024] The method for extracting gold, silver and antimony from arsenic-antimony gold concentrate in stages according to the present invention can effectively realize the efficient extraction and recovery of gold, silver and antimony from arsenic-antimony gold concentrate in stages. When the arsenic-antimony gold concentrate contains 10-60g / t of gold, 20-300g / t of silver, 5-8wt% of arsenic and 1-3wt% of antimony, step S1 can produce antimony minerals containing 8-20wt%, 10-20g / t of gold, 20-100g / t of silver, 0.50-1.00wt% of arsenic and 10-20wt% of sulfur, and antimony minerals containing 0.10-0.20wt% of antimony. wt%, containing 10-70g / t of gold, 30-350g / t of silver, 1.00-10.00wt% of arsenic, and 20-40wt% of sulfur; step S2 can obtain an antimony leaching solution containing 10-100g / l of antimony, and an antimony tailing containing 0.1-0.3wt%, 12-22g / t of gold, 30-120g / t of silver, 0.52-0.62wt% of arsenic, and 20-40wt% of sulfur. The method comprises the following steps: step S3, wherein the antimony leaching tailings contain 40-50wt% of antimony and the filtrate contain 0.3-0.5g / l of antimony; step S4, wherein the reducing roasted slag contain 30-60g / t of gold, 60-300g / t of silver, 0.10-0.30wt% of arsenic, 0.10-0.30wt% of antimony and 30-50wt% of iron, and the sulfur-containing flue gas, and arsenic trioxide and industrial sulfuric acid are recovered; step S5, wherein the acid leaching slag contain 50-130g / t of gold, 100-600g / t of silver, 3-10wt% of iron, 0.01-0.05wt% of arsenic and 0.01-0.05wt% of antimony; and step S6, wherein the acid leaching slag is added into the copper smelting furnace, and the precious metals such as gold and silver enter the copper and are then recycled, and the total recovery rate of gold and silver reaches more than 98.5%.

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

[0026] The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate of the present invention is simple and easy to operate, and realizes efficient cascade extraction and efficient recovery of gold, silver and antimony from arsenic-antimony gold concentrate through integrated process technology of antimony enrichment by flotation, antimony leaching by wet method, roasting treatment of antimony leaching tailings and antimony selection tailings, acidification treatment and smelting treatment, and is suitable for gold concentrate containing 1.0-10.0wt% of arsenic and 1.0-10.0wt% of antimony. Among them, flotation enrichment of antimony ore further improves the antimony grade of antimony ore, which is conducive to reducing the construction investment of wet leaching project, reducing the wet leaching processing volume and reducing production cost; wet leaching of antimony ore and oxidation precipitation of antimony realize the recovery of antimony in a short process, the antimony leaching rate reaches more than 95%, the antimony precipitation rate is high, and the antimony mud is directly sold to the antimony smelter; high-temperature reduction roasting and high-acid leaching of roasted slag break the defect of the traditional two-stage roasting process that it is difficult to dissociate and expose the gold and silver monomer particles, and achieve the purpose of mineral removal and efficient enrichment of gold and silver; the pyrometallurgical smelting process makes full use of the acid leaching slag enriched with gold and silver to make blocks and add them into the pyrometallurgical copper smelting furnace to extract gold and silver with copper, and the total recovery rate of gold and silver reaches 98.5-99.5%. 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] Example 1

[0029] A method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate, comprising the following steps:

[0030] S1 flotation enrichment of antimony ore: add water to the gold concentrate containing 10g / t of gold, 20g / t of silver, 5wt% of arsenic and 1wt% of antimony to adjust the slurry to 20wt%, add 10kg / t of soda ash, 1kg / t of sodium ferrocyanide and 100g / t of lead nitrate, grind to a fineness of -0.037mm accounting for 80%, stir for 2h, add 200g / t of butyl xanthate and 10g / t of 2# oil, carry out a roughing selection, a secondary scavenging selection and a secondary concentrating process, and produce antimony ore containing 8wt% of antimony, 10g / t of gold, 20g / t of silver, 0.50wt% of arsenic and 10wt% of sulfur, and antimony tailings containing 0.10wt% of antimony, 10g / t of gold, 30g / t of silver, 5.50wt% of arsenic and 20wt% of sulfur;

[0031] S2 Wet leaching of antimony ore: add 10kg / t of sodium hydroxide and 20kg / t of sodium sulfide to the antimony ore, adjust the slurry to a slurry concentration of 40wt%, stir for 1h, and use a continuous washing filter to separate liquid and solid to obtain an antimony leaching solution containing 10g / l of antimony and an antimony leaching tailing containing 0.1wt% of antimony, 12g / t of gold, 30g / t of silver, 0.52wt% of arsenic, and 12wt% of sulfur;

[0032] S3 Antimony leachate oxidation precipitation: The antimony leachate is deeply filtered and purified by a filter press, and hydrogen peroxide is used as an oxidizing agent. The amount of hydrogen peroxide added is 10kg / m 3 , stirring, the stirring speed is 800r / min, the oxidation time is 3h, and after oxidation, a filter press is used for liquid-solid separation to obtain antimony mud containing 40wt% antimony and antimony oxide precipitation filtrate containing 0.3g / l antimony;

[0033] S4 Antimony leaching tailings and antimony beneficiation tailings high temperature reduction roasting: After the antimony leaching tailings and antimony beneficiation tailings are combined, the slurry is adjusted to 65wt% by using the antimony oxide precipitation filtrate. The adjusted slurry is continuously fed into the reduction boiling furnace. The reduction furnace temperature is controlled to 750℃, the blower is controlled to be stable, the air excess coefficient is controlled to 0.8, and the oxygen-deficient roasting is maintained to oxidize most of the arsenic into arsenic trioxide, which enters the flue gas in the form of gas, and all the sulfur is SO 2 The product enters the flue gas in the form of arsenic, and is recovered through flue gas dry dust removal, electrostatic dust removal, arsenic collection by quenching, wet purification, electrostatic demisting, and conversion dry absorption processes to recover arsenic trioxide and industrial sulfuric acid; at the same time, a reduction roasting slag containing 30g / t of gold, 60g / t of silver, 0.10wt% of arsenic, 0.10wt% of antimony, and 30wt% of iron is obtained;

[0034] S5 high acid leaching of reduced roasted slag to remove impurities: the reduced roasted slag is slurried with a sulfuric acid solution with a sulfuric acid concentration of 10wt% to a mineral concentration of 10wt%, the temperature is controlled at 80°C, the acid leaching time is 12h, and liquid-solid separation is performed after acid leaching to obtain acid leaching slag containing 50g / t gold, 100g / t silver, 3wt% iron, 0.01wt% arsenic, and 0.01wt% antimony;

[0035] S6 acid leaching slag pyrometallurgical smelting to recover gold and silver: the acid leaching slag is pressed into blocks and added into a pyrometallurgical copper smelting furnace at a smelting temperature of 1230°C for 60 minutes. Precious metals such as gold and silver enter the copper and are then recycled. The total recovery rate of gold is 98.55%, and the total recovery rate of silver is 98.58%. The total recovery rates of gold and silver both reach above 98.5%.

[0036] Example 2

[0037] A method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate, comprising the following steps:

[0038] S1 flotation enrichment of antimony ore: add water to the gold concentrate containing 35g / t gold, 160g / t silver, 6.5wt% arsenic and 3wt% antimony to adjust the slurry to 30wt%, add 15kg / t soda ash, 3kg / t sodium ferrocyanide and 200g / t lead nitrate, grind to a fineness of -0.037mm accounting for 85%, stir for 6h, add 400g / t butyl xanthate and 55g / t 2# oil, carry out a roughing selection, a secondary scavenging selection and a secondary concentrating process, and produce antimony ore containing 14wt% antimony, 15g / t gold, 60g / t silver, 0.75wt% arsenic and 15wt% sulfur, and antimony tailings containing 0.15wt% antimony, 40g / t gold, 190g / t silver, 7.00wt% arsenic and 30wt% sulfur;

[0039] S2 wet leaching of antimony ore: add 15kg / t of sodium hydroxide and 60kg / t of sodium sulfide to the antimony ore, adjust the slurry to a slurry concentration of 45wt%, stir for 2.5h, use a continuous washing filter to separate liquid and solid, and obtain an antimony leaching solution containing 55g / l of antimony and an antimony leaching tailing containing 0.20wt% of antimony, 17g / t of gold, 75g / t of silver, 0.57wt% of arsenic, and 17wt% of sulfur;

[0040] S3 Antimony leachate oxidation precipitation: The antimony leachate is deeply filtered and purified by a filter press, and hydrogen peroxide is used as an oxidizing agent. The amount of hydrogen peroxide added is 30kg / m 3 , stirring, the stirring speed is 900r / min, the oxidation time is 4.5h, and after oxidation, a filter press is used for liquid-solid separation to obtain an antimony mud containing 45wt% antimony and an antimony oxide precipitation filtrate containing 0.4g / l antimony;

[0041] S4 High-temperature reduction roasting of antimony leaching tailings and antimony beneficiation tailings: After the antimony leaching tailings and antimony beneficiation tailings are combined, the slurry is adjusted to 67.5wt% by using the antimony oxide precipitation filtrate. The adjusted slurry is continuously fed into the reduction boiling furnace. The temperature of the reduction furnace is controlled at 825℃, the blower is controlled to be stable, the air excess coefficient is controlled at 0.9, and the oxygen-deficient roasting is maintained, so that most of the arsenic is oxidized into arsenic trioxide, which enters the flue gas in the form of gas, and all the sulfur is SO 2 The product enters the flue gas in the form of a precipitate, and is recovered through flue gas dry dust removal, electrostatic dust removal, quenching to collect arsenic, wet purification, electrostatic demisting, and conversion dry absorption processes to recover arsenic trioxide and industrial sulfuric acid; at the same time, a reduction roasting slag containing 45g / t of gold, 180g / t of silver, 0.20wt% of arsenic, 0.20wt% of antimony, and 40wt% of iron is obtained;

[0042] S5 high acid leaching of reduced roasted slag to remove impurities: the reduced roasted slag is slurried with a sulfuric acid solution having a sulfuric acid concentration of 40wt% to a mineral concentration of 30wt%, the temperature is controlled at 100°C, the acid leaching time is 18h, and liquid-solid separation is performed after acid leaching to obtain acid leaching slag containing 90g / t of gold, 350g / t of silver, 6.5wt% of iron, 0.03wt% of arsenic, and 0.03wt% of antimony;

[0043] S6 acid leaching slag pyrometallurgical smelting to recover gold and silver: the acid leaching slag is pressed into blocks and added into a pyrometallurgical copper smelting furnace at a smelting temperature of 1280°C for 90 minutes. Precious metals such as gold and silver enter the copper and are then recycled. The total recovery rate of gold is 99.01%, and the total recovery rate of silver is 99.02%. The total recovery rates of gold and silver both reach above 99.0%.

[0044] Example 3

[0045] A method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate, comprising the following steps:

[0046] S1 flotation enrichment of antimony ore: add water to the gold concentrate containing 60g / t of gold, 300g / t of silver, 8wt% of arsenic and 3wt% of antimony to adjust the slurry to 40wt%, add 20kg / t of soda ash, 5kg / t of sodium ferrocyanide and 300g / t of lead nitrate, grind to a fineness of -0.037mm accounting for 90%, stir for 10h, add 600g / t of butyl xanthate and 100g / t of 2# oil, carry out a roughing selection, a secondary scavenging selection and a secondary concentrating process, and produce antimony ore containing 20wt% of antimony, 20g / t of gold, 100g / t of silver, 1.00wt% of arsenic and 20wt% of sulfur, and antimony tailings containing 0.20wt% of antimony, 70g / t of gold, 350g / t of silver, 10.00wt% of arsenic and 40wt% of sulfur;

[0047] S2 Wet leaching of antimony ore: adding 20kg / t of sodium hydroxide and 100kg / t of sodium sulfide to the antimony ore, slurrying to a slurry concentration of 50wt%, stirring time of 4h, using a continuous washing filter for liquid-solid separation, to obtain an antimony leaching solution containing 100g / l of antimony and an antimony leaching tailing containing 0.3wt% of antimony, 22g / t of gold, 120g / t of silver, 0.62wt% of arsenic, and 22wt% of sulfur;

[0048] S3 Antimony leachate oxidation precipitation: The antimony leachate is deeply filtered and purified by a filter press, and hydrogen peroxide is used as an oxidizing agent. The amount of hydrogen peroxide added is 50kg / m 3 , stirring, the stirring speed is 1000r / min, the oxidation time is 6h, and after oxidation, a filter press is used for liquid-solid separation to obtain antimony mud containing 50wt% antimony and antimony oxide precipitation filtrate containing 0.5g / l antimony;

[0049] S4 High-temperature reduction roasting of antimony leaching tailings and antimony beneficiation tailings: After the antimony leaching tailings and antimony beneficiation tailings are combined, the slurry is adjusted to 70wt% by using the antimony oxide precipitation filtrate. The adjusted slurry is continuously fed into the reduction boiling furnace. The temperature of the reduction furnace is controlled at 900℃, the blower is controlled to be stable, the air excess coefficient is controlled at 1.0, and the oxygen-deficient roasting is maintained to oxidize most of the arsenic into arsenic trioxide, which enters the flue gas in the form of gas, and all the sulfur is SO 2 The arsenic trioxide and industrial sulfuric acid are recovered through flue gas dry dust removal, electrostatic dust removal, quenching to collect arsenic, wet purification, electrostatic demisting, and conversion dry absorption processes; at the same time, a reduction roasting slag containing 60g / t of gold, 300g / t of silver, 0.30wt% of arsenic, 0.30wt% of antimony, and 50wt% of iron is obtained;

[0050] S5 high acid leaching of reduced roasted slag to remove impurities: the reduced roasted slag is slurried with a sulfuric acid solution having a sulfuric acid concentration of 70wt% to a mineral concentration of 50wt%, the temperature is controlled at 120°C, the acid leaching time is 24h, and liquid-solid separation is performed after acid leaching to obtain acid leaching slag containing 130g / t of gold, 600g / t of silver, 10wt% of iron, 0.05wt% of arsenic, and 0.05wt% of antimony;

[0051] S6 acid leaching slag pyrometallurgical smelting to recover gold and silver: the acid leaching slag is pressed into blocks and added into a pyrometallurgical copper smelting furnace at a smelting temperature of 1290°C for 90 minutes. Precious metals such as gold and silver enter the copper and are then recycled. The total recovery rate of gold is 99.51%, and the total recovery rate of silver is 99.52%. The total recovery rates of gold and silver both reach above 99.5%.

[0052] 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 cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate, characterized in that: The steps include: S1 flotation enrichment of antimony ore: add water to the arsenic-antimony-gold concentrate to adjust the slurry to 20-40wt%, add soda ash, sodium ferrocyanide and lead nitrate, grind the ore, stir for 2-10 hours, add butyl xanthate and 2# oil, carry out the first roughing, second scavenging and second concentrating process, and produce antimony ore and antimony tailings; S2 Wet leaching of antimony ore: adding sodium hydroxide and sodium sulfide to the antimony ore, adjusting the slurry to a slurry concentration of 40-50wt%, stirring for 1-4h, and liquid-solid separation to obtain antimony leaching solution and antimony leaching tailings; S3 Antimony leaching solution oxidation precipitation: The antimony leaching solution is filtered and purified, and hydrogen peroxide is used as an oxidizing agent. The mixture is stirred and oxidized for 3 to 6 hours, and liquid-solid separation is performed to obtain antimony mud and antimony oxidization precipitation filtrate; S4 High-temperature reduction roasting of antimony leaching tailings and antimony selection tailings: After the antimony selection tailings and antimony leaching tailings are combined, the slurry is adjusted to 65-70wt% by using the antimony oxide precipitation filtrate, and then the slurry enters the reduction boiling furnace for reduction to obtain reduction roasting slag and flue gas; S5 high acid leaching of reduced roasted slag to remove impurities: The reduced roasted slag is slurried with sulfuric acid solution to a mineral concentration of 10-50wt%, the temperature is controlled at 80-120°C, the acid leaching time is 12-24h, and liquid-solid separation is performed after acid leaching to obtain acid leaching slag; S6 acid leaching slag pyrometallurgical smelting to recover gold and silver: the acid leaching slag is added into the pyrometallurgical copper smelting furnace to recover gold and silver.

2. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In the step S1, the amount of soda ash added is 10-20 kg / t, the amount of sodium ferrocyanide added is 1-5 kg / t, and the amount of lead nitrate added is 100-300 g / t.

3. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In the step S1, grinding to a fineness of -0.037 mm accounts for 80-90%.

4. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In the step S1, the amount of butyl xanthate added is 200-600 g / t, and the amount of 2# oil added is 10-100 g / t.

5. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In step S2, the amount of sodium hydroxide added is 10-20 kg / t, and the amount of sodium sulfide added is 20-100 kg / t.

6. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In the step S2, a continuous washing filter is used for liquid-solid separation.

7. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In step S3, the amount of hydrogen peroxide added is 10-50 kg / m 3 , the stirring speed is 800~1000r / min.

8. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In step S4, the temperature of the reduction boiling furnace is 750-900° C., and the excess air coefficient is controlled at 0.8-1.

0.

9. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In step S4, the flue gas is treated by flue gas dry dust removal, electrostatic dust removal, quenching arsenic collection, wet purification, electrostatic demisting, and conversion dry absorption processes.

10. The method for cascade extraction of gold, silver and antimony from arsenic-antimony gold concentrate according to claim 1, characterized in that: In the step S5, the concentration of sulfuric acid is 10-70 wt %.