High-efficiency grading separation and environmental protection gold extraction method for high-sulfur and high-muddy refractory gold ore

Abstract

The application provides a high-sulfur and high-mud difficult-to-separate gold ore step-by-step efficient separation and environment-friendly gold extraction method, which is based on the difference in separation efficiency of primary ore and argillaceous ore, adopts washing pretreatment and secondary grading precise control-mineral classification separation and step-by-step extraction-waste gas sulfur fixation and decyanation technical method, and realizes efficient and environment-friendly recovery of high-sulfur and high-mud difficult-to-separate gold ore. The application not only reduces the over-crushing problem caused by different hardness of ores in the grinding process, improves the separation efficiency, but also realizes classified efficient leaching of micro-fine particle disseminated sulfide wrapped gold and conventional gold concentrate by adopting differential pretreatment of primary sulfide ore flotation concentrate and argillaceous flotation concentrate for cyanide gold extraction. In addition, sulfur fixation and detoxification neutralization are carried out based on the characteristics of waste gas and leaching slurry in the roasting process of gold concentrate, the cyanide tailings do not need harmless disposal for decyanation, and can meet the general solid waste index, which effectively avoids the pollution risk of conventional cyanide gold extraction to the environment.

Description

Technical Field

[0001] This invention relates to the field of gold ore beneficiation and gold extraction technology, and in particular to a cascaded, efficient, and environmentally friendly gold extraction method for difficult-to-process gold ores with high sulfur and high mud content. Background Technology

[0002] With the continuous depletion of global mineral resources, easily beneficiated gold ores are gradually decreasing, and the development and utilization of difficult-to-beneficiate gold ores are becoming increasingly important. However, the recovery effect of difficult-to-beneficiate gold ores is poor, especially the development and utilization of mixed ores with high sulfur, high arsenic, carbon, fine particle disseminated, and high mud formation. In particular, for high sulfur and high mud formation gold ores with complex ore properties, the content of minerals such as sulfides and mudstone in the ore is high, and the symbiotic relationship between these minerals is complex, making beneficiation extremely difficult. This type of ore has three significant characteristics: (1) High sulfur and high mud formation gold ores are usually mixed ores of primary ore and oxidized mudstone ore. The primary ore mainly exists in the form of lumps, while the oxidized ore mainly exists in the form of powder, either independently or attached to the surface of the lumps. (2) The mineral hardness in high sulfur and high mud formation gold ores varies greatly, and the grinding products are extremely polarized, which affects the gold mineral beneficiation effect. (3) The separation efficiency of primary ore and argillaceous ore differs greatly. A single beneficiation process cannot simultaneously achieve the recovery effect of argillaceous minerals and primary ore. Moreover, the mixed beneficiation of the two types of minerals will have an adverse effect on the other mineral. (4) Primary ore has a high sulfur content. Sulfides are the main carrier minerals of gold. Gold minerals are usually contained in sulfides in the form of fine-grained encapsulation. Conventional cyanide leaching has a low leaching rate. In addition, production practice shows that cyanide is the lowest cost and best indicator leaching agent for extracting gold minerals. However, cyanide is highly toxic and poses a risk of environmental pollution. Therefore, how to achieve efficient and environmentally friendly development and utilization of difficult-to-process gold ores is an important problem that needs to be solved in the field of mineral processing.

[0003] In view of this, it is necessary to design an improved, efficient, and environmentally friendly gold extraction method for high-sulfur, high-mudification, and difficult-to-process gold ores in order to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a cascaded, efficient, and environmentally friendly gold extraction method for high-sulfur, high-mudification, and difficult-to-process gold ores, so as to achieve efficient recovery of high-sulfur, high-mudification, and difficult-to-process gold ores and eliminate the potential risks associated with the use of cyanide for gold extraction.

[0005] To achieve the above objectives, this invention provides a method for efficient and environmentally friendly gold extraction from high-sulfur, highly muddy, and refractory gold ores through a cascade separation process, comprising the following steps:

[0006] S1. The high-sulfur, high-mudification ore is coarsely crushed, and the coarsely crushed product is washed to obtain coarse-grained product and fine-grained ore slime; the obtained coarse-grained product is subjected to medium-fine crushing to obtain medium-fine crushed product, and the fine-grained ore slime is classified to obtain classified coarse-grained product and classified fine-grained material; the classified coarse-grained product and the medium-fine crushed product are combined to form primary ore; the classified fine-grained material is argillaceous ore.

[0007] S2. The primary ore and argillaceous ore obtained in step S1 are ground separately to make the gold minerals reach the state of individual liberation, and then they are enriched by flotation. The primary ore flotation yields primary ore flotation concentrate and primary ore flotation tailings; the argillaceous ore flotation yields argillaceous flotation concentrate and argillaceous flotation tailings.

[0008] S3. The primary ore flotation concentrate obtained in step S2 is subjected to oxidative roasting. The roasting residue is combined with the muddy flotation concentrate for grinding. The pulp concentration and pulp pH value are adjusted. Sodium cyanide is used for cyanide leaching to extract gold, resulting in gold concentrate cyanide tailings and gold ingots.

[0009] S4. The primary ore flotation tailings and muddy flotation tailings obtained in step S2 are combined and finely ground. The ground product is introduced into the whole mud cyanide leaching system, the pulp concentration and pulp pH value are adjusted, and sodium cyanide is used for cyanide leaching to extract gold, resulting in whole mud cyanide tailings and gold ingots.

[0010] S5. The gold concentrate cyanide tailings obtained in step S3 and the whole mud cyanide tailings obtained in step S4 are combined into a cyanide leaching composite residue. The flue gas generated during the oxidation roasting of the primary ore flotation concentrate is introduced into the cyanide leaching composite residue for sulfur fixation, detoxification, and pulp neutralization.

[0011] As a further improvement of the present invention, in step S1, the particle size of the coarse-grained product is +(10~12)mm, and the particle size of the medium-fine crushed product is 8~10mm.

[0012] Furthermore, the fine-grained sludge is classified twice using a spiral classifier and a high-frequency stacked screen.

[0013] As a further improvement of the present invention, in step S2, the gold mineral reaching the monomer liberation state means that the content of the product with a particle size of -0.074 mm is 65% to 80% and the flotation concentration is 25% to 30%.

[0014] Furthermore, the content of -0.074mm in the ground product of primary ore is 65%–70%, and the flotation concentration is 28%–30%; the content of -0.074mm in the ground product of argillaceous ore is 70%–80%, and the flotation concentration is 25%–28%.

[0015] As a further improvement of the present invention, in step S3, the temperature of the oxidative roasting is 650-750°C, the content of the -0.037mm product after grinding the roasting residue and the muddy flotation concentrate is 90%-95%, the pulp concentration is 35%-40%, the pulp pH value is 10.5-11.5, and the amount of sodium cyanide used is 3kg / t-5kg / t.

[0016] As a further improvement of the present invention, in step S4, the content of the grinding product -0.074mm is 90% to 92%, the slurry concentration is 40% to 45%, the slurry pH value is 10.5 to 11.5, and the amount of sodium cyanide is 0.6 kg / t to 1.0 kg / t.

[0017] The beneficial effects of this invention are:

[0018] (1) This invention provides a high-efficiency, environmentally friendly gold extraction method for high-sulfur, high-mudification, and refractory gold ores. Based on the difference in separation efficiency between primary and muddy ores, a technical method of precise control of washing pretreatment and secondary classification, mineral classification and tiered extraction, and waste gas desulfurization and cyanide reduction is adopted to achieve efficient recovery of high-sulfur, high-mudification, and refractory gold ores. Precise separation and classification of primary and muddy minerals reduces the problem of over-grinding caused by the difference in ore hardness during grinding, avoids the mutual influence of the two types of ores on flotation indicators, improves the separation efficiency of gold-bearing mineral sulfides, and achieves efficient primary separation of gold minerals. The whole-mud cyanidation process further recovers the easily lost fine-grained gold and intercalated gold from the two types of flotation tailings, achieving efficient recovery of gold from tailings. Differential pretreatment cyanidation extraction of primary sulfide ore flotation concentrate and muddy flotation concentrate is adopted to achieve efficient leaching of fine-grained disseminated sulfide-encapsulated gold and conventional gold concentrate.

[0019] (2) This invention utilizes the flue gas from the roasting process of sulfide flotation concentrate to pretreat the cyanide tailings of whole-sludge and gold concentrate. This not only reduces free cyanide and ferrocyanate in the cyanide tailings slurry, but also allows the calcium oxide in the slurry to interact with sulfur dioxide and its reactants in the flue gas, reducing the content of sulfur dioxide in the flue gas and free calcium oxide in the slurry. This achieves sulfur fixation, detoxification, and neutralization. The solid material after pressure filtration of the pretreated slurry meets the cyanide slag utilization standards in HJ 943—2018 "Technical Specification for Pollution Control of Cyanide Slag in the Gold Industry," eliminating the environmental pollution risk of cyanide use. Furthermore, the filtrate can be recycled back into the production process as needed. This invention is highly operable, with a tightly integrated process flow, significantly improving the beneficiation recovery index of high-sulfur, high-mudification, and difficult-to-process gold ores, and achieving safe, environmentally friendly, and efficient utilization of difficult-to-process gold ores. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the efficient and environmentally friendly gold extraction method for high-sulfur, high-mudification, and difficult-to-process gold ores provided in Embodiment 1 of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0023] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] This invention provides a method for efficient and environmentally friendly gold extraction from high-sulfur, highly muddy, and refractory gold ores through a cascade separation process, comprising the following steps:

[0025] S1. The high-sulfur, high-mud ore is coarsely crushed, and the coarsely crushed product is washed to obtain coarse-grained product and fine-grained ore slime; the obtained coarse-grained product is then subjected to medium and fine crushing to obtain medium and fine-grained product, and the fine-grained ore slime is classified to obtain classified coarse-grained product and classified fine-grained material; the classified coarse-grained product and the medium and fine crushed product are combined to form primary ore; the classified fine-grained material is argillaceous ore.

[0026] Specifically, the coarse-grained product produced by the washing process has a particle size of +(10~12)mm, and the medium-fine crushed product obtained after medium-fine crushing has a particle size of 8~10mm. The fine-grained ore slime is classified twice using a spiral classifier and a high-frequency stacked screen (-2mm). The classified coarse-grained product and the medium-fine crushed product are combined to form the primary ore. The classified fine-grained material is argillaceous ore with a particle size of -2mm.

[0027] S2. Grind the primary ore and argillaceous ore obtained in step S1 separately to achieve the liberation of gold minerals into individual particles, and then perform flotation enrichment on each. After flotation of the primary ore, primary ore flotation concentrate and primary ore flotation tailings are obtained; after flotation of the argillaceous ore, argillaceous flotation concentrate and argillaceous flotation tailings are obtained.

[0028] Gold minerals reaching a state of monomer liberation means that the content of products with a particle size of -0.074 mm is 65% to 80%, and the flotation concentration is 25% to 30%.

[0029] Specifically, the primary ore grinding product has a -0.074mm content of 65% to 70%, and the pulp concentration is adjusted to 28% to 30% for flotation to obtain primary ore flotation concentrate and primary ore flotation tailings; the argillaceous ore is ground using a vertical mill and ceramic balls, the grinding product has a -0.074mm content of 70% to 80%, and the pulp concentration is adjusted to 25% to 28% for flotation to obtain argillaceous flotation concentrate and argillaceous flotation tailings.

[0030] S3. The primary ore flotation concentrate obtained in step S2 is subjected to oxidative roasting. The roasting residue is combined with the muddy flotation concentrate for grinding. The pulp concentration and pulp pH value are adjusted, and gold is extracted by cyanide leaching with sodium cyanide to obtain gold concentrate cyanide tailings and gold ingots.

[0031] Specifically, the primary ore flotation concentrate is oxidatively roasted at a temperature of 650–750℃, followed by water quenching. The roasted residue is combined with the muddy flotation concentrate for grinding. The grinding product has a -0.037mm content of 90%–95%. The pulp concentration is adjusted to 35%–40%, and the pulp pH is set to 10.5–11.5. Sodium cyanide is added at 3 kg / t–5 kg / t for cyanide leaching, yielding gold concentrate cyanide tailings and gold ingots.

[0032] S4. The primary ore flotation tailings and mud flotation tailings obtained in step S2 are combined and finely ground. The grinding product is introduced into the whole mud cyanide leaching system, the pulp concentration and pulp pH value are adjusted, and sodium cyanide is used for cyanide leaching to extract gold, resulting in whole mud cyanide tailings and gold ingots.

[0033] Specifically, the grinding product has a -0.074mm content of 90% to 92%, the slurry concentration is adjusted to 40% to 45%, the slurry pH value is 10.5 to 11.5, and sodium cyanide is added at 0.6 kg / t to 1.0 kg / t for cyanide leaching, producing whole mud cyanide tailings and gold ingots.

[0034] S5. Combine the gold concentrate cyanide tailings obtained in step S3 and the whole mud cyanide tailings obtained in step S4 into a cyanide leaching composite residue. Introduce the flue gas generated during the oxidation roasting of the primary ore flotation concentrate into the cyanide leaching composite residue for sulfur fixation, detoxification, and pulp neutralization.

[0035] Specifically, the slurry that has been desulfurized and neutralized is subjected to solid-liquid separation using a filter press. The solid material is stored in the tailings dam, while the liquid is returned to the grinding and washing operations.

[0036] The following describes the efficient and environmentally friendly gold extraction method for high-sulfur, high-mudification, and difficult-to-process gold ores provided by the present invention, using specific embodiments.

[0037] Example 1

[0038] This embodiment uses a high-sulfur, highly muddy gold ore as the research object. The raw ore contains 7.5 g / t of gold, 5.91% of sulfur, 7.45% of iron, and less than 0.001% of the harmful element As. The non-metallic minerals in the ore are mainly quartz, pyroxene (severely chloritized), and chlorite, followed by carbonate minerals, feldspars, montmorillonite, illite, etc. The metallic minerals are mainly pyrite and hematite (hematite is mainly an oxidation product of magnetite), and the ore oxidation rate is 20%.

[0039] like Figure 1 As shown, a cascaded, efficient, and environmentally friendly gold extraction method for refractory gold ores with high sulfur and high mud content includes the following steps:

[0040] S1. The ore is coarsely crushed, and the coarsely crushed product is washed to obtain coarse-grained product and fine-grained ore slime. The coarse-grained product has a particle size of +12mm. The coarse-grained product is then subjected to medium and fine crushing to obtain a medium and fine crushed product with a particle size P80 of 10mm. The fine-grained ore slime is classified twice using a spiral classifier and a high-frequency stacked screen (-2mm). The classified coarse-grained product and the medium and fine crushed product are combined to form the original ore. The classified fine-grained material is argillaceous ore with a particle size of -2mm.

[0041] S2. The primary ore and argillaceous ore are ground separately. The grinding product of the primary ore has a -0.074mm content of 68%. The pulp concentration is adjusted to 30% and then floated to obtain primary ore flotation concentrate and primary ore flotation tailings. The argillaceous ore is ground using a vertical mill and ceramic balls. The grinding product has a -0.074mm content of 75%. The pulp concentration is adjusted to 26% and then floated to obtain argillaceous flotation concentrate and argillaceous flotation tailings.

[0042] S3. The primary ore flotation concentrate is oxidatively roasted at 700℃, followed by water quenching. The roasting residue is combined with the muddy flotation concentrate and ground. The grinding product has a -0.037mm content of 92%. The pulp concentration is adjusted to 35%, the pulp pH is 11, and cyanide leaching is performed by adding 3.5 kg / t of sodium cyanide to produce gold concentrate cyanide tailings and gold ingots.

[0043] S4. The primary ore and the flotation tailings of the argillaceous ore are combined and then finely ground. The grinding product has a -0.074mm content of 90%. The pulp concentration is adjusted to 40%, the pulp pH is 11, and sodium cyanide is added at 0.8 kg / t for cyanide leaching to produce whole mud cyanide tailings and gold ingots.

[0044] S5. The gold concentrate cyanide tailings and whole mud cyanide tailings are combined into a cyanide leaching composite residue. The flue gas generated during the oxidation roasting of the primary ore flotation concentrate is introduced into the cyanide leaching composite residue for sulfur fixation and detoxification and slurry neutralization. The slurry after sulfur fixation, detoxification and neutralization is separated into solid and liquid by a filter press. The solid material is stored in the tailings pond, and the liquid is returned to the grinding and washing operations.

[0045] Comparative Example 1

[0046] Comparative Example 1 uses the same high-sulfur, high-mudification gold ore as Example 1, the difference being that Comparative Example 1 employs a conventional flotation-flotation concentrate cyanidation leaching process, the specific steps of which are as follows:

[0047] Step 1: The above-mentioned high-sulfur, high-mudification gold ore is crushed using a three-stage closed-circuit process. The crushed product has a particle size of P80 of 10mm. The crushed product is then ground, and the content of the -0.074mm particle size in the ground product is 70%.

[0048] Step 2: Adjust the pulp concentration of the above-mentioned grinding product to 30% and carry out flotation to produce flotation concentrate and flotation tailings.

[0049] Step 3: Grind the above flotation concentrate to obtain a grinding product with a -0.037mm content of 90%. Adjust the pulp concentration to 35% and the pulp pH to 11. Add 3.5 kg / t of sodium cyanide for cyanide leaching to produce gold concentrate cyanide tailings and gold ingots.

[0050] Step 4: The above-mentioned cyanide tailings are separated into solid and liquid by a filter press. The solid material is stored in the tailings dam, and the liquid is returned to the cyanide leaching and grinding process.

[0051] Comparative Example 2

[0052] Comparative Example 2 uses the same high-sulfur, high-mudification gold ore as Example 1, the difference being that Comparative Example 2 employs a conventional whole-mud cyanidation process for raw ore, the specific steps of which are as follows:

[0053] Step 1: The above-mentioned high-sulfur, high-mudification gold ore is crushed using a three-stage closed-circuit process. The crushed product has a particle size of P80 of 10mm. The crushed product is then ground, and the content of -0.074mm in the ground product is 92%.

[0054] Step 2: Adjust the concentration of the above-mentioned grinding product to 40%, the pH of the slurry to 11, and add sodium cyanide at 0.8 kg / t for cyanide leaching to produce whole mud cyanide tailings and gold ingots.

[0055] Step 3: The above-mentioned whole mud cyanide fine filter press performs solid-liquid separation. The solid material is stored in the tailings dam, and the liquid is returned to the cyanide leaching and grinding process.

[0056] The detection indicators of Example 1 and Comparative Examples 1-2 are shown in Table 1. The comparison shows that the present invention not only significantly improves the gold extraction efficiency, but also significantly reduces the cyanide content of the filter residue and filtrate before and after solid-liquid separation. The total cyanide content in the filter residue is only 2.86 mg / L, which meets the requirement of 5 mg / L for solid cyanide content in HJ 943—2018 "Technical Specification for Pollution Control of Cyanide Slag in Gold Industry".

[0057] Table 1 Gold Extraction Indicators for Different Methods

[0058]

[0059] In summary, the high-efficiency cascade separation and environmentally friendly gold extraction method for high-sulfur, high-muddy, refractory gold ores provided by this invention, based on the difference in separation efficiency between primary ore and muddy ore, employs a technical approach of precise control through washing pretreatment and secondary classification, mineral classification and cascade extraction, and waste gas desulfurization and decyanation. This achieves efficient recovery of high-sulfur, high-muddy, refractory gold ores. This invention not only reduces the problem of over-grinding caused by differences in ore hardness during grinding, improving separation efficiency, but also utilizes differentiated pretreatment of primary sulfide flotation concentrate and muddy flotation concentrate for cyanide extraction, achieving efficient leaching of finely disseminated sulfide-encapsulated gold and conventional gold concentrate. Furthermore, the waste gas generated during gold ore roasting is not emitted into the air, and the cyanide tailings do not require harmless treatment for decyanation, effectively avoiding the environmental pollution risks associated with conventional cyanide gold extraction.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for efficient and environmentally friendly gold extraction from high-sulfur, highly muddy, and refractory gold ores through a cascade separation process, characterized in that: Includes the following steps: S1. The high-sulfur, high-mudification ore is coarsely crushed, and the coarsely crushed product is washed to obtain coarse-grained product and fine-grained ore slime; the obtained coarse-grained product is subjected to medium-fine crushing to obtain medium-fine crushed product, and the fine-grained ore slime is classified to obtain classified coarse-grained product and classified fine-grained material; the classified coarse-grained product and the medium-fine crushed product are combined to form primary ore; the classified fine-grained material is argillaceous ore. S2. The primary ore and argillaceous ore obtained in step S1 are ground separately to make the gold minerals reach the state of individual liberation, and then they are enriched by flotation. The primary ore flotation yields primary ore flotation concentrate and primary ore flotation tailings; the argillaceous ore flotation yields argillaceous flotation concentrate and argillaceous flotation tailings. S3. The primary ore flotation concentrate obtained in step S2 is subjected to oxidative roasting. The roasting residue is combined with the muddy flotation concentrate for grinding. The pulp concentration and pulp pH value are adjusted. Sodium cyanide is used for cyanide leaching to extract gold, resulting in gold concentrate cyanide tailings and gold ingots. S4. The primary ore flotation tailings and mud flotation tailings obtained in step S2 are combined and finely ground. The ground product is introduced into the whole mud cyanide leaching system, the pulp concentration and pulp pH value are adjusted, and sodium cyanide is used for cyanide leaching to extract gold, resulting in whole mud cyanide tailings and gold ingots. S5. The gold concentrate cyanide tailings obtained in step S3 and the whole mud cyanide tailings obtained in step S4 are combined into a cyanide leaching composite residue. The flue gas generated during the oxidation roasting of the primary ore flotation concentrate is introduced into the cyanide leaching composite residue for sulfur fixation, detoxification, and pulp neutralization.

2. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S1, the particle size of the coarse-grained product is +(10~12)mm.

3. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S1, the particle size of the medium-fine crushed product is 8-10 mm.

4. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S1, the fine-grained sludge is classified twice using a spiral classifier and a high-frequency stacked screen.

5. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S2, the gold mineral reaching the monomer liberation state means that the content of the -0.074mm product is 65% to 80% and the flotation concentration is 25% to 30%.

6. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 5, characterized in that, The content of -0.074mm in the ground product of primary ore is 65% to 70%, and the flotation concentration is 28% to 30%. The content of -0.074mm in the ground product of argillaceous ore is 70% to 80%, and the flotation concentration is 25% to 28%.

7. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S3, the oxidative roasting temperature is 650-750℃, and the content of -0.037mm in the grinding product after grinding the roasting residue and the muddy flotation concentrate is 90%-95%.

8. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S3, the slurry concentration is 35% to 40%, the slurry pH value is 10.5 to 11.5, and the amount of sodium cyanide used is 3 kg / t to 5 kg / t.

9. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S4, the content of the -0.074mm particle size in the grinding product is 90% to 92%.

10. The method for efficient cascade separation and environmentally friendly gold extraction of high-sulfur, high-mudification, and refractory gold ores according to claim 1, characterized in that, In step S4, the pulp concentration is 40% to 45%, the pulp pH value is 10.5 to 11.5, and the amount of sodium cyanide used is 0.6 kg / t to 1.0 kg / t.

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