A method for comprehensively recovering valuable elements from arsenic-antimony mixed gold concentrate

Abstract

The present invention belongs to the technical field of comprehensive recovery of complex polymetallic gold and silver concentrates, and relates to a method for comprehensively recovering valuable elements from arsenic- and antimony-containing mixed gold concentrates, comprising the following steps: (1) first-stage arsenic suppression flotation of antimony-gold concentrates; (2) cyanidation leaching of gold and silver from the tailings of the second-stage flotation; (3) activation flotation of the tailings of the third-stage cyanidation to produce antimony-gold concentrates; (4) roasting and cyanidation of the tailings of the fourth-stage terminal antimony separation to extract gold. Through the integrated technology of arsenic suppression flotation of antimony-gold concentrates - cyanidation leaching of gold and silver from flotation tailings - activation flotation of cyanidation tailings to produce antimony-gold concentrates - roasting and cyanidation of terminal antimony tailings to extract gold, the whole technological process is simple and smooth, with a high comprehensive recovery rate of arsenic- and antimony-containing mixed gold concentrates. The recovery rates of gold and silver reach over 95% and 90% respectively, which are 8-10% higher than those of conventional processes. The efficient recovery of valuable elements from arsenic- and antimony-containing mixed gold concentrates and the comprehensive utilization of resources are realized, greatly improving the economic benefits of enterprises.

Description

Technical Field

[0001] The present invention belongs to the technical field of comprehensive recovery of complex polymetallic gold and silver concentrates, and particularly relates to a method for comprehensively recovering valuable elements from arsenic and antimony-containing mixed gold concentrates. Background Art

[0002] In the western region of China, there are a large number of antimony-gold symbiotic mineral deposits. These deposits generally use flotation to produce antimony-gold concentrates. Antimony is widely used in flame retardants, alloy materials, refractory materials, etc. due to its excellent physical and chemical properties, and it is an important mineral resource. In order to make full use of antimony-gold concentrates, it is necessary to comprehensively process and recover antimony-gold concentrates to improve the resource utilization rate of antimony and gold.

[0003] Currently, the commonly used flotation processes for antimony-gold ores mainly include bulk flotation, antimony-gold separation, and preferential flotation of antimony-gold. For the bulk flotation process, various minerals such as stibnite, arsenopyrite, and pyrite will enter the antimony-gold concentrate at the same time. The arsenopyrite that has floated into the bulk concentrate is difficult to be inhibited during the separation process because its surface adsorbs the collector, resulting in excessive arsenic in the antimony concentrate. For the preferential flotation process of antimony-gold, the floatability of arsenopyrite is relatively low in the initial stage of flotation. However, as stibnite enters the concentrate product, the metal content in the pulp decreases sharply. At the same time, with the extension of the flotation time, the surface of arsenopyrite is slightly oxidized, and its surface hydrophilic film falls off, resulting in the secondary activation and floating of arsenopyrite into the middling product. Arsenopyrite cannot be effectively inhibited, leading to its vicious cycle within the process and entering the antimony concentrate product in the form of mechanical entrainment or floating in the subsequent process cycle. This is another important factor affecting the arsenic content in antimony-gold ores.

[0004] The gold smelting enterprises in China mainly use cyanidation leaching process, and antimony elements seriously affect the gold leaching rate of the cyanidation leaching process. Therefore, in order to ensure the gold leaching rate, the gold smelting enterprises require that the antimony content in the gold concentrate is below 1wt%. Currently, for antimony-arsenic-gold concentrates, the method of first removing antimony and arsenic by two-stage roasting and then cyaniding to leach gold and silver is mainly adopted. This method will produce pollutants such as sulfur dioxide, antimony powder, and arsenic trioxide. In addition, the roasting method sinterizes the gold in the gold concentrate, affecting the gold recovery rate, and at the same time, it cannot completely separate antimony and gold, affecting the utilization rate of the concentrate. Comprehensively and efficiently recycling antimony-arsenic-gold concentrates has become an important technical direction for the sustainable development of smelting enterprises. Summary of the Invention

[0005] In view of the above deficiencies of the existing technology, the present invention provides a method for comprehensively recovering valuable elements from arsenic and antimony-containing mixed gold concentrates. The specific technical solutions are as follows:

[0006] A method for comprehensively recovering valuable elements from arsenic and antimony-containing mixed gold concentrates, comprising the following steps:

[0007] (1)First-stage arsenic-removing flotation of antimony-gold concentrate: Adjust the pulp concentration of the arsenic-bearing antimony mixed gold concentrate to 20 - 30 wt%, add carbon powder, and then adjust the pH value to 8 - 9; add sulfur-arsenic inhibitor and stir for 2 - 4 h; then add collector and frother, and adopt a flotation process of one roughing, two scavengings, and four cleanings to obtain the preliminary antimony-gold concentrate and the preliminary flotation tailings;

[0008] (2)Cyanidation leaching of gold and silver from the second-stage flotation tailings: Grind the preliminary flotation tailings, add sodium cyanide during the grinding process, and adopt a cyanidation leaching process of two leachings and two washings to obtain cyanidation leaching pulp and gold-silver-containing filtrate; filter the cyanidation leaching pulp to obtain cyanidation tailings; use zinc powder to displace gold and silver from the gold-silver-containing filtrate for smelting to produce gold and silver products;

[0009] (3)Third-stage activation flotation of cyanidation tailings to produce antimony-gold concentrate: Adjust and control the pH value of the cyanidation tailings to 8 - 9, add lead concentrate, lead acetate, lead nitrate, collector and frother, and carry out a technological process of one roughing, two scavengings, and four cleanings to obtain antimony-gold concentrate and terminal antimony-selection tailings;

[0010] (4)Fourth-stage roasting and cyanidation gold extraction from terminal antimony-selection tailings: Adjust the pulp of the terminal antimony-selection tailings to a pulp concentration of 60 - 70 wt%, add sodium hypochlorite, stir for 6 - 8 h, enter the first-stage roasting furnace for roasting, and then enter the second-stage roasting furnace for roasting. Add coking sulfur paste during the second-stage roasting process to obtain roasting flue gas and roasted ore. The roasting flue gas is used to produce sulfuric acid products through an acid-making system, and gold and silver products are produced from the roasted ore through a cyanidation gold extraction process.

[0011] Among them, the composition of the arsenic-bearing antimony mixed gold concentrate is 20 - 60 g / t of gold, 200 - 500 g / t of silver, 0.10 - 0.50 wt% of copper, 15 - 25 wt% of sulfur, 1 - 5 wt% of arsenic, and 4 - 8 wt% of antimony.

[0012] The present invention provides a method for comprehensively recovering valuable elements from arsenic-bearing antimony mixed gold concentrate. Through the integrated technology of arsenic-removing flotation of antimony-gold concentrate - cyanidation leaching of gold and silver from flotation tailings - activation flotation of cyanidation tailings to produce antimony-gold concentrate - roasting and cyanidation gold extraction from terminal antimony tailings, the efficient recovery of valuable elements from arsenic-bearing antimony mixed gold concentrate and the comprehensive utilization of resources are realized, greatly improving the economic benefits of enterprises.

[0013] Step (1): First-stage arsenic-removing flotation of antimony-gold concentrate can produce an antimony-gold concentrate containing 20-30 g / t of gold, 200-300 g / t of silver, 40-50 wt% of antimony, and 0.5-1.5 wt% of arsenic, as well as a flotation tailing containing 30-100 g / t of gold, 300-600 g / t of silver, 3-5 wt% of antimony, and 2-6 wt% of arsenic; in step (2), the secondary flotation tailing is cyanide-leached for gold and silver, and the obtained cyanide tailing contains 20-60 g / t of gold, 100-200 g / t of silver, 3-5 wt% of antimony, and 2-6 wt% of arsenic; in step (3), the tertiary cyanide tailing is activated and flotated to produce an antimony-gold concentrate, and the produced antimony-gold concentrate contains 10-20 g / t of gold, 100-200 g / t of silver, 36-40 wt% of antimony, and 0.6-1.0 wt% of arsenic, as well as a terminal antimony-selection tailing containing 30-60 g / t of gold, 60-100 g / t of silver, 0.3-0.5 wt% of antimony, 3-7 wt% of arsenic, and 20-28 wt% of sulfur; in step (4), the quaternary terminal antimony-selection tailing is roasted and cyanide-leached for gold extraction, and the gold leaching rate reaches 92-95 wt% and the silver leaching rate reaches 80-90 wt%.

[0014] Further, in the said step (1), based on the arsenic-bearing antimony mixed gold concentrate, the amount of carbon powder added is 1000-2000 g / t; sodium carbonate is used to adjust the pH value.

[0015] Further, in the said step (1), the sulfur-arsenic inhibitor is sodium sulfite and sodium humate. Based on the arsenic-bearing antimony mixed gold concentrate, the addition amount of sodium sulfite is 1000-2000 g / t, and the addition amount of sodium humate is 1000-2000 g / t.

[0016] Further, based on the arsenic-bearing antimony mixed gold concentrate, the dosage of the collector is 200-400 g / t, and the collector is ethyl thionocarbamate; the dosage of the frother is 50-100 g / t, and the frother is No. 2 oil.

[0017] The collector ethyl thionocarbamate can enhance the hydrophobicity of antimony minerals, enabling antimony to float into the loaded foam with the collector; the frother No. 2 oil can enhance the strength of the loaded foam and improve the flotation effect.

[0018] Further, in the said step (2), during the grinding process, the grinding pulp concentration is controlled at 50-60 wt%, and the grinding time is 20-30 minutes. The grinding fineness of the primary flotation tailing after grinding is -0.037 mm accounting for 90%-95%.

[0019] Further, in the said step (2), based on the primary flotation tailing ore, the addition amount of sodium cyanide is 10-20 kg / t. In the cyanide leaching process, the sodium cyanide concentration is controlled at 0.50-0.70 wt%, and the leaching time of the cyanide leaching process is 36 + 24 h.

[0020] Furthermore, the soluble gold and silver products can be removed after one leaching every 36 hours, which is more conducive to improving the gold and silver leaching rates in the subsequent second leaching.

[0021] Furthermore, in step (3), sulfuric acid is used to adjust the pH value of the cyanidation tailings; based on the cyanidation tailings, the dosage of sulfuric acid is 3000 - 5000 g / t.

[0022] Furthermore, in step (3), based on the cyanidation tailings, the lead concentrate contains 60 - 65 wt% lead and the fineness of -0.037 mm accounts for 97 - 99%, the dosage of the lead concentrate is 3000 - 5000 g / t; the dosage of lead acetate is 100 - 500 g / t; the dosage of lead nitrate is 100 - 500 g / t.

[0023] The lead sulfide in the lead concentrate has good floatability, which can synergistically improve the floatability of antimony minerals and also has the effect of activating antimony minerals; both lead acetate and lead nitrate have the effect of activating antimony minerals.

[0024] Furthermore, in step (3), based on the cyanidation tailings, the dosage of the collector is 300 - 500 g / t, and the collector is isoamyl xanthate; the dosage of the frother is 50 - 70 g / t, and the frother is No. 2 oil.

[0025] Furthermore, in step (4), based on the final antimony - selected tailings, the dosage of sodium hypochlorite is 5000 - 10000 g / t, and the dosage of coking sulfur paste is 30 - 50 kg / t.

[0026] The addition of sodium hypochlorite can improve the decomposition of cyanide, and at the same time eliminate the coating film on the mineral surface, introduce chloride ions, which is beneficial to the roasting of the final antimony - selected tailings and the improvement of the gold and silver leaching rates. During the first - stage roasting process, a considerable part of sulfur burns, and the sulfur content in the second stage decreases. The combustion heat generated cannot meet the second - stage roasting temperature. In order to increase and ensure the second - stage roasting temperature, a part of coking sulfur paste is added.

[0027] Furthermore, the roasting temperature of the first - stage roasting furnace is 550 - 600 °C, and the roasting time is 2 - 4 h; the roasting temperature of the second - stage roasting furnace is 630 - 700 °C, and the roasting time is 2 - 4 h.

[0028] The present invention adopts two - stage roasting. The first - stage roasting is carried out at a lower temperature, which is beneficial to the removal of arsenic; the second - stage roasting increases the temperature to further remove sulfur minerals; the two - stage roasting is beneficial to the decomposition of minerals encapsulating gold.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] The present invention adopts the process of arsenic - inhibited flotation of antimony - gold concentrate to effectively recover easy - to - separate antimony minerals. Meanwhile, the grinding fineness is controlled, eliminating the problem that the over - fine grinding fineness, slimeification of antimony minerals, and increased oxidation degree affect the antimony flotation recovery rate.

[0031] The present invention realizes the recovery of gold and silver that are easily cyanide - leached from flotation tailings through the processes of cyanide leaching of gold and silver from flotation tailings and activated flotation of cyanide tailings to produce antimony - gold concentrate. Meanwhile, during the cyanide leaching process, the inhibition of sulfur and arsenic in minerals is further strengthened. By increasing the grinding fineness, it is beneficial to further improve the dissociation degree of antimony minerals from arsenic minerals and sulfur minerals, and by adopting effective activation methods, it is further beneficial to improve the antimony flotation recovery rate.

[0032] The present invention conducts roasting and cyanide gold extraction on the terminal antimony - selected tailings. After recovering antimony minerals at the front end, it eliminates the key problem that antimony minerals melt and bond during roasting, secondarily encapsulating gold and resulting in a decrease in the subsequent cyanide recovery rate of gold. Thus, it eliminates the encapsulation of certain oxides formed on the surface of gold particles, and further exposes the physically - encapsulated and chemically - combined gold and silver well, improving the gold recovery rate.

[0033] The present invention provides a method for comprehensively recovering valuable elements from arsenic - containing antimony - mixed gold concentrate. Through the integrated technology of arsenic - inhibited flotation of antimony - gold concentrate - cyanide leaching of gold and silver from flotation tailings - activated flotation of cyanide tailings to produce antimony - gold concentrate - roasting and cyanide gold extraction of terminal antimony tailings, the entire technological process is simple and smooth, with a high comprehensive recovery rate of arsenic - containing antimony - mixed gold concentrate. The recovery rates of gold and silver reach over 95% and 90% respectively, which are 8 - 10% higher than those of conventional processes. It realizes the efficient recovery of valuable elements from arsenic - containing antimony - mixed gold concentrate and the comprehensive utilization of resources, greatly improving the economic benefits of enterprises. Specific Embodiments

[0034] The principles and features of the present invention are described below in conjunction with examples. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] Example 1:

[0036] A method for comprehensively recovering valuable elements from arsenic - containing antimony - mixed gold concentrate includes the following steps:

[0037] (1)Primary arsenic-removing flotation of antimony-gold concentrate: Adjust the pulp concentration of the arsenic-bearing antimony mixed gold concentrate to 20 wt%, add 1000 g / t of carbon powder, adjust the pH value to 8 with sodium carbonate, add 1000 g / t of sodium sulfite and 1000 g / t of sodium humate, stir for 2 h, use 200 g / t of ethyl thionocarbamate and 50 g / t of No. 2 oil. Adopt a flotation process of one roughing, two scavengings and four cleanings to produce a primary-selected antimony-gold concentrate containing 20 g / t of gold, 200 g / t of silver, 40 wt% of antimony and 0.5 wt% of arsenic, and a primary-selected flotation tailing containing 30 g / t of gold, 300 g / t of silver, 3 wt% of antimony and 2 wt% of arsenic. Among them, the components of the arsenic-bearing antimony mixed gold concentrate are: 20 g / t of gold, 200 g / t of silver, 0.10 wt% of copper, 15 wt% of sulfur, 1 wt% of arsenic and 4 wt% of antimony;

[0038] (2)Cyanidation leaching of gold and silver from secondary flotation tailings: Grind the primary-selected flotation tailings, control the grinding pulp concentration at 50 wt%, the grinding time at 20 minutes, add 10 kg / t of sodium cyanide during the grinding process, and the grinding fineness of -0.037 mm accounts for 90%. Control the sodium cyanide concentration at 0.50 wt% during the cyanidation process. Adopt a cyanidation leaching process of two leachings and two washings, with a leaching time of 36 + 24 h. Filter the cyanidation leaching pulp to obtain cyanidation tailings. The filtrate containing gold and silver is smelted by zinc powder replacement to produce gold and silver products. The cyanidation tailings contain 20 g / t of gold, 100 g / t of silver, 3 wt% of antimony and 2 wt% of arsenic, and enter the next process;

[0039] (3)Activated flotation of tertiary cyanidation tailings to produce antimony-gold concentrate: Use sulfuric acid as the pH adjuster, with a sulfuric acid dosage of 3000 g / t, 3000 g / t of lead concentrate containing 60 wt% of lead and a fineness of -0.037 mm accounting for 97%, 100 g / t of lead acetate, 100 g / t of lead nitrate, 300 g / t of isoamyl xanthate and 50 g / t of No. 2 oil. Conduct a technological process of one roughing, two scavengings and four cleanings to produce a antimony-gold concentrate containing 10 g / t of gold, 100 g / t of silver, 36 wt% of antimony and 0.6 wt% of arsenic, and a terminal antimony-selection tailing containing 30 g / t of gold, 60 g / t of silver, 0.3 wt% of antimony, 3 wt% of arsenic and 20 wt% of sulfur, and enter the next process for treatment;

[0040] (4)Fourth-stage terminal antimony ore tailings roasting and cyanidation for gold extraction: The terminal antimony ore tailings are slurried to a pulp density of 60 wt%, with a sodium hypochlorite dosage of 5000 g / t and a stirring time of 6 h. Then it enters the first-stage roasting furnace at a roasting temperature of 550 °C for 2 h. The roasted ore from the first stage enters the second-stage roasting furnace by gravity. During the second-stage roasting, coking sulfur paste is added with a dosage of 30 kg / t, the roasting temperature is 630 °C, and the roasting time is 2 h. The roasting flue gas is used to produce sulfuric acid products through an acid-making system. The roasted ore undergoes a cyanidation process for gold extraction, with a gold leaching rate reaching 92% and a silver leaching rate reaching 80%, and finally gold and silver products are produced.

[0041] Example 2:

[0042] A method for comprehensively recovering valuable elements from arsenic-antimony mixed gold concentrate, comprising the following steps:

[0043] (1)First-stage arsenic inhibition and antimony-gold flotation: The pulp density of the arsenic-antimony mixed gold concentrate is adjusted to 25 wt%, 1500 g / t of carbon powder is added, the pH value is adjusted to 8.5 with sodium carbonate, 1500 g / t of sodium sulfite and 1500 g / t of sodium humate are added, and it is stirred for 3 h. The dosage of ethyl thionocarbazide is 300 g / t, and the dosage of No. 2 oil is 75 g / t. A flotation process of one roughing, two scavengings, and four cleanings is adopted to produce a primary antimony-gold concentrate containing 25 g / t of gold, 250 g / t of silver, 45 wt% of antimony, and 1.0 wt% of arsenic, and a primary flotation tailings containing 65 g / t of gold, 450 g / t of silver, 4 wt% of antimony, and 4 wt% of arsenic. Among them, the composition of the arsenic-antimony mixed gold concentrate is: 40 g / t of gold, 350 g / t of silver, 0.30 wt% of copper, 20 wt% of sulfur, 3 wt% of arsenic, and 6 wt% of antimony;

[0044] (2)Second-stage flotation tailings cyanidation for gold and silver leaching: The primary flotation tailings are ground, with the pulp density during grinding controlled at 55 wt% and the grinding time of 25 minutes. The addition amount of sodium cyanide during grinding is 15 kg / t, and the grinding fineness of -0.037 mm accounts for 92.5%. During cyanidation, the sodium cyanide concentration is controlled at 0.60 wt%. A cyanidation leaching process of two leachings and two washings is adopted, with a leaching time of 36 + 24 h. The cyanidation leaching pulp is filtered to obtain cyanidation tailings, and the filtrate containing gold and silver is smelted by zinc powder replacement to produce gold and silver products. The cyanidation tailings contain 40 g / t of gold, 150 g / t of silver, 4 wt% of antimony, and 4 wt% of arsenic, and enter the next process;

[0045] (3) Activating and floating the tertiary cyanide tailings to produce antimony-gold concentrate: Using sulfuric acid as the pH regulator with a dosage of 4000 g / t, 4000 g / t of lead concentrate containing 62.5 wt% lead and with a fineness of -0.037 mm accounting for 98%, 300 g / t of lead acetate, 300 g / t of lead nitrate, 400 g / t of isoamyl xanthate, and 60 g / t of No. 2 oil. Conduct a process flow of one roughing, two scavengings, and four cleanings to produce an antimony-gold concentrate containing 15 g / t of gold, 150 g / t of silver, 38 wt% of antimony, and 0.8 wt% of arsenic, as well as a terminal antimony flotation tailing containing 45 g / t of gold, 80 g / t of silver, 0.4 wt% of antimony, 5 wt% of arsenic, and 24 wt% of sulfur, which enters the next process for treatment;

[0046] (4) Roasting and cyaniding the terminal antimony flotation tailings to extract gold: Adjust the pulp density of the terminal antimony flotation tailings to 65 wt%, with a dosage of 7500 g / t of sodium hypochlorite and a stirring time of 7 h. Then enter the first-stage roasting furnace with a roasting temperature of 575 °C and a roasting time of 3 h. The roasted ore from the first stage enters the second-stage roasting furnace by the action of its own gravity. During the second-stage roasting process, 40 kg / t of coking sulfur paste is added, with a roasting temperature of 665 °C and a roasting time of 3 h. The roasting flue gas is used to produce sulfuric acid products through the acid-making system. The roasted ore undergoes the cyanide gold extraction process, with a gold leaching rate reaching 93.5% and a silver leaching rate reaching 85%, and finally gold and silver products are produced.

[0047] Example 3:

[0048] A method for comprehensively recovering valuable elements from arsenic-bearing antimony mixed gold concentrate, comprising the following steps:

[0049] (1) First-stage arsenic suppression flotation of antimony-gold concentrate: Adjust the pulp density of the arsenic-bearing antimony mixed gold concentrate to 30 wt%, add 2000 g / t of carbon powder, adjust the pH value to 9 with sodium carbonate, add 2000 g / t of sodium sulfite and 2000 g / t of sodium humate, stir for 4 h, with a dosage of 400 g / t of ethyl thionocarbamate and 100 g / t of No. 2 oil. Adopt a flotation process of one roughing, two scavengings, and four cleanings to produce a primary antimony-gold concentrate containing 30 g / t of gold, 300 g / t of silver, 50 wt% of antimony, and 1.5 wt% of arsenic, as well as a primary flotation tailing containing 100 g / t of gold, 600 g / t of silver, 5 wt% of antimony, and 6 wt% of arsenic; wherein, the composition of the arsenic-bearing antimony mixed gold concentrate is: 60 g / t of gold, 500 g / t of silver, 0.50 wt% of copper, 25 wt% of sulfur, 5 wt% of arsenic, and 8 wt% of antimony;

[0050] (2)Cyanidation leaching of gold and silver from secondary flotation tailings: The preliminary flotation tailings are ground, with the pulp density controlled at 60 wt%, the grinding time being 30 minutes, the sodium cyanide addition amount during grinding being 20 kg / t, the grinding fineness of -0.037 mm accounting for 95%, the sodium cyanide concentration being controlled at 0.70 wt% during cyanidation, adopting a two-stage leaching and two-stage washing cyanidation leaching process, the leaching time being 36 + 24 h. The cyanidation leaching pulp is filtered to obtain cyanidation tailings, and the filtrate containing gold and silver is smelted by zinc powder replacement to produce gold and silver products; the cyanidation tailings contain 60 g / t of gold, 200 g / t of silver, 5 wt% of antimony, and 6 wt% of arsenic, and enter the next process step;

[0051] (3)Activated flotation of tertiary cyanidation tailings to produce antimony-gold concentrate: Sulfuric acid is used as the pH adjuster with a dosage of 5000 g / t, lead concentrate with 65 wt% lead and a fineness of -0.037 mm accounting for 99% is used with a dosage of 5000 g / t, lead acetate is used with a dosage of 500 g / t, lead nitrate is used with a dosage of 500 g / t, isopentyl xanthate is used with a dosage of 500 g / t, and No. 2 oil is used with a dosage of 70 g / t. A process of one roughing, two scavengings, and four cleanings is carried out to produce an antimony-gold concentrate containing 20 g / t of gold, 200 g / t of silver, 40 wt% of antimony, and 1.0 wt% of arsenic, and a final antimony-selection tailings containing 60 g / t of gold, 100 g / t of silver, 0.5 wt% of antimony, 7 wt% of arsenic, and 28 wt% of sulfur, which enter the next process step for treatment;

[0052] (4)Roasting and cyanidation gold extraction from quaternary final antimony-selection tailings: The final antimony-selection tailings are adjusted to a pulp density of 70 wt%, with a sodium hypochlorite dosage of 10000 g / t and a stirring time of 8 h, and then enter a first-stage roasting furnace with a roasting temperature of 600 °C and a roasting time of 4 h. The first-stage roasted ore enters the second-stage roasting furnace by the action of its own gravity. During the second-stage roasting process, coking sulfur paste is added with a dosage of 40 kg / t, the roasting temperature is 700 °C, and the roasting time is 4 h. The roasting flue gas is used to produce sulfuric acid products through an acid-making system. The roasted ore undergoes a cyanidation gold extraction process, with the gold leaching rate reaching 95% and the silver leaching rate reaching 90%, and finally gold and silver products are produced.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for comprehensively recovering valuable elements from arsenic-antimony mixed gold concentrate, characterized in that, It includes the following steps: (1) First-stage arsenic-removing flotation of antimony-gold concentrate: Adjust the pulp concentration of the arsenic-bearing antimony mixed gold concentrate to 20-30 wt%, add carbon powder, and based on the arsenic-bearing antimony mixed gold concentrate, the amount of carbon powder added is 1000-2000 g / t; then use sodium carbonate to adjust the pH value to 8-9; then add an arsenic-sulfur inhibitor and stir for 2-4 h; then add a collector and a foaming agent, and adopt a one-rougher-two-scavengers-four-cleaners flotation process to obtain a preliminary antimony-gold concentrate and preliminary flotation tailings; (2) Cyanide leaching of gold and silver from the second-stage flotation tailings: Grind the preliminary flotation tailings, add sodium cyanide during the grinding process, and adopt a two-leaching-two-washing cyanide leaching process to obtain a cyanide leaching pulp and a gold and silver-containing filtrate; filter the cyanide leaching pulp to obtain cyanide tailings; use zinc powder to displace gold and silver from the gold and silver-containing filtrate to smelt and produce gold and silver products; based on the preliminary flotation tailings ore, the addition amount of sodium cyanide is 10-20 kg / t, control the sodium cyanide concentration at 0.50-0.70 wt% in the cyanide leaching process, and the leaching time of the cyanide leaching process is 36 + 24 h; (3) Third-stage activation flotation of cyanide tailings to produce antimony-gold concentrate: Adjust the pH value of the cyanide tailings to 8-9, add lead concentrate, lead acetate, lead nitrate, a collector and a foaming agent, and carry out a one-rougher-two-scavengers-four-cleaners process flow to obtain a antimony-gold concentrate and final antimony-selection tailings; the lead concentrate contains 60-65 wt% lead and the fineness of -0.037 mm accounts for 97-99%, and based on the cyanide tailings, the dosage of the lead concentrate is 3000-5000 g / t; the dosage of lead acetate is 100-500 g / t; the dosage of lead nitrate is 100-500 g / t; (4) Fourth-stage roasting and cyanide gold extraction from the final antimony-selection tailings: Adjust the pulp of the final antimony-selection tailings to a pulp concentration of 60-70 wt%, add sodium hypochlorite, stir for 6-8 h, enter a first-stage roasting furnace for roasting, and then enter a second-stage roasting furnace for roasting. Add coking sulfur paste during the second-stage roasting process to obtain roasting flue gas and roasted ore. The roasting flue gas is used by an acid-making system to produce sulfuric acid products, and the roasted ore undergoes a cyanide gold extraction process to produce gold and silver products; the roasting temperature of the first-stage roasting furnace is 550-600 °C, and the roasting time is 2-4 h; the roasting temperature of the second-stage roasting furnace is 630-700 °C, and the roasting time is 2-4 h.

2. The method for comprehensively recovering valuable elements from arsenic-antimony mixed gold concentrate according to claim 1, characterized in that, In the step (1), the arsenic-sulfur inhibitor is sodium sulfite and sodium humate. Based on the arsenic-bearing antimony mixed gold concentrate, the addition amount of sodium sulfite is 1000-2000 g / t, and the addition amount of sodium humate is 1000-2000 g / t.

3. The method for comprehensively recovering valuable elements from arsenic-containing and antimony-containing mixed gold concentrates according to claim 1, characterized in that, In the step (1), based on the arsenic-bearing antimony mixed gold concentrate, the dosage of the collector is 200-400 g / t, and the collector is ethyl thionocarbamate; the dosage of the foaming agent is 50-100 g / t, and the foaming agent is No. 2 oil.

4. The method for comprehensively recovering valuable elements from arsenic-antimony mixed gold concentrate according to claim 1, characterized in that, In the step (2), control the pulp concentration during grinding at 50-60 wt%, and the grinding time is 20-30 minutes.

5. The method for comprehensively recovering valuable elements from arsenic-containing antimony mixed gold concentrate according to claim 1, characterized in that, In the step (3), based on the cyanide tailings, the dosage of the collector is 300-500 g / t, and the collector is isoamyl xanthate; the dosage of the frother is 50-70 g / t, and the frother is No. 2 oil.

6. The method for comprehensively recovering valuable elements from arsenic-containing and antimony-containing mixed gold concentrates according to claim 1, characterized in that, In the step (4), based on the final antimony tailings, the dosage of sodium hypochlorite is 5000-10000 g / t, and the dosage of coking sulfur paste is 30-50 kg / t.