Treatment method for high-silt-content secondary oxidation gold-bearing iron ore

Abstract

The invention relates to a treatment method for high-mud-content secondary oxidation gold-containing iron ore. The treatment method comprises the steps of abrasive washing-gravity separation and tailing pre-discarding; performing two-stage magnetic separation and secondary enrichment; finely grinding and grading the pre-enriched high-grade minerals; cyanidation leaching; and recovering iron through two-stage magnetic separation. According to the method, two times of pre-enrichment and one time of cyanide-free tailing pre-discarding are achieved through the synergistic effect of abrasive washing-reselection tailing pre-discarding and weak magnetic-strong magnetic secondary enrichment, a large amount of soil, decomposed rocks and gangue are removed in advance at the front end of the grading process to serve as cyanide-free tailings, fine-grained and micro-fine-grained iron minerals in the pre-discarded tailings are fully recycled, and the purpose of recycling the iron minerals in the pre-discarded tailings is achieved. And loss of gold, silver and iron is reduced to the greatest extent. And then, the pre-enriched high-grade minerals are finely ground and graded, so that gold, silver and iron mineral monomers are fully dissociated, and a foundation is laid for subsequent cyanidation leaching and efficient separation of magnets and limonite. And finally, efficient gradient recovery of gold, silver and iron is achieved through the cyanidation leaching-two-stage magnetic separation technology, and the cyanide-containing tailings are lightened while the resource utilization rate is maximized.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically relating to a method for processing secondary oxidized gold-bearing iron ore with high mud content, which is particularly suitable for the comprehensive recovery of gold, silver and iron minerals from secondary oxidized gold-bearing iron ore containing a large amount of mud and weathered rock. Background Technology

[0002] High-mud-content secondary oxidized gold-bearing iron ores are mostly found on the surface of large gold deposits. They are formed through long-term geological activity, constantly oxidized and transported by water and air. The ore contains a large amount of mud and gangue. Gold and silver mainly occur as fine-grained and micro-fine-grained native gold, native silver, and silver-manganese ore, associated or co-occurring with magnetite, limonite, and gangue. The traditional beneficiation process of "two-stage closed-circuit grinding and classification - whole-mud cyanidation leaching - two-stage magnetic separation" results in severe mudification of the slurry after fine grinding, making it difficult to effectively separate and recover magnetite, limonite, and mud from the ore slime. The mud-like entrainers in the concentrate also have serious surface adhesion problems. During cyanide leaching, the viscosity of the slurry increases dramatically, severely deteriorating the leaching and adsorption working environment. This leads to insufficient dissolved oxygen in the slurry, inadequate dispersion of reacting ions, and insufficient surface contact, which in turn affects the leaching and adsorption indicators of gold and silver. It also produces a large amount of cyanide-containing tailings, increasing the investment in subsequent harmless treatment. Furthermore, a large amount of soil and weathered rock enters the production process, ineffectively consuming reagents and energy such as sodium cyanide, lime, nitric acid, and activated carbon, resulting in increased costs. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a method for processing gold-bearing iron ore with high mud content secondary oxidation, aiming to achieve comprehensive recovery of gold, silver, and iron in an economical, efficient, environmentally friendly, and low-cost manner, thereby reducing production costs and environmental risks.

[0004] The specific technical solution is as follows: A method for processing gold-bearing iron ore with high mud content secondary oxidation includes the following steps: (1) Grinding-gravity separation pre-tailing: The ore is fed into a semi-autogenous mill for grinding and washing to obtain a grinding slurry with 55%-60% of -200 mesh. The grinding slurry is then sent to a hydrocyclone gravity separator for gravity separation to obtain gravity-separated sand and gravity-separated overflow ore. This step utilizes the grinding and self-washing functions of a semi-autogenous mill to initially separate gangue and secondary clay from the iron minerals that carry gold and silver under moderate grinding conditions, preventing the clay from encapsulating the gold and silver minerals. Then, the density difference is used to separate the already separated iron-gold-silver minerals (i.e., gravity separation sediment) from the light clay and fine-grained gangue (i.e., gravity separation overflow ore), completing a pre-enrichment and pre-tailing (discarding 30%-40% of the clay and weathered rock in advance), reducing the processing volume of subsequent fine grinding, cyanidation and magnetic separation operations, while avoiding over-grinding of fine and micro-fine particles.

[0005] (2) Two-stage magnetic separation and secondary enrichment: The gravity separation overflow ore from step (1) is fed into a magnetic separator with a magnetic field strength of 220-350mT for weak magnetic roughing to obtain weak magnetic rough concentrate and weak magnetic rough tailings; the weak magnetic rough tailings are then fed into a magnetic separator with a magnetic field strength of 0.8-1.0T for strong magnetic roughing to obtain strong magnetic rough concentrate and strong magnetic rough tailings, which are cyanide-free tailings; This step involves two-stage magnetic separation of gravity overflow containing fine and micro-fine particles, which can fully recover the residual magnetite and limonite, and re-enrich the gold and silver carrier minerals, minimizing the loss of gold, silver and iron in the pre-disposal tailings, and achieving cyanide-free tailings disposal (which can be directly discharged or utilized without harmless treatment).

[0006] (3) Fine grinding and classification pre-leaching: The gravity separation sediment from step (1), the weak magnetic rough concentrate from step (2) and the strong magnetic rough concentrate are combined and finely ground in a closed circuit to obtain a finely ground overflow ore with a content of -200 mesh of 90%-93%. Before cyanidation, the pre-enriched high-grade minerals undergo a closed-circuit fine grinding and classification process to fully liberate or expose the gold and silver minerals from the iron carrier minerals, while simultaneously achieving the liberation of individual iron minerals. This method of enrichment followed by fine grinding avoids the high energy consumption and over-grinding mud formation caused by fine grinding of the entire ore, ensures complete liberation of gold and silver, provides optimal particle size conditions for cyanidation leaching, and improves the degree of liberation of individual iron minerals, laying the foundation for the efficient separation of magnetite and limonite in the subsequent process. (4) Cyanide leaching: The finely ground overflow ore from step (3) is subjected to cyanide leaching, and lime, sodium cyanide and activated carbon are added to obtain gold-loaded carbon and cyanide tailings. Since a large amount of clay has been removed in advance, the problem of clay formation has been solved. The pulp viscosity is low, the dissolved oxygen is sufficient, and the ion dispersion is good. The indicators such as cyanide leaching rate, reagent consumption, and leaching time have all been significantly improved.

[0007] (5) Two-stage magnetic separation to recover iron: The cyanide tailings from step (4) are sent to a magnetic separator with a magnetic field strength of 160-220mT for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic concentrate is the magnetite concentrate product. The weak magnetic tailings are sent to a magnetic separator with a magnetic field strength of 0.6-0.8T for strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings. The strong magnetic concentrate is the limonite concentrate product, and the strong magnetic tailings is the cyanide tailings. Since the iron minerals in the cyanide tailings have been fully liberated, this step can recover magnetite and limonite in stages through two-stage magnetic separation, realizing the recovery of traditionally lost iron resources and the reduction of tailings volume, and ultimately significantly reducing the yield of cyanide-containing tailings.

[0008] (6) Gold and silver refining and casting: The gold-loaded carbon from step (4) is subjected to traditional desorption-electrowinning-smelting-gold and silver separation-casting to obtain gold and silver ingots.

[0009] Furthermore, the amount of reagents added in step (4) is: 4 kg / t-5 kg / t of lime, 1.0 kg / t-1.5 kg / t of sodium cyanide, and 10 g / t-15 g / t of activated carbon.

[0010] Furthermore, in step (2), the magnetic field strength for the weak magnetic coarse selection is 350 mT and the magnetic field strength for the strong magnetic coarse selection is 1.0 T; in step (5), the magnetic field strength for the weak magnetic fine selection is 220 mT and the magnetic field strength for the strong magnetic fine selection is 0.8 T.

[0011] Furthermore, the gold-loaded carbon from step (4) is subjected to conventional desorption-electrowinning-smelting-gold-silver separation-casting to obtain gold and silver ingots.

[0012] Furthermore, the method is applicable to a high-mud content secondary oxidized gold-bearing iron ore with a mineral clay mainly composed of aluminosilicates (25%-35%), supplemented by carbonates (10%-20%), and containing Au (1.5g / t-3.0g / t), Ag (25g / t-40g / t), TFe (25%-33%), and mFe (5%-8%).

[0013] The beneficial effects of this invention are as follows: This invention targets secondary oxidized gold-bearing iron ore with high mud content. First, through the synergistic effect of "grinding-gravity separation pre-tailings removal" and "weak magnetic-strong magnetic secondary enrichment," it achieves two pre-enrichment processes and one cyanide-free pre-tailings removal. This removes a large amount of mud, weathered rock, and gangue as cyanide-free tailings at the front end of the beneficiation process, and fully recovers fine and micro-fine iron minerals from the pre-tailings, minimizing the loss of gold, silver, and iron. This synergistic mechanism not only avoids over-grinding and mudification of the entire ore but also reduces the yield of cyanide-containing tailings at the source, creating favorable conditions for subsequent operations. Then, fine grinding and classification of only the pre-enriched high-grade minerals significantly reduces grinding costs and prevents mud from encapsulating gold and silver minerals and adhering to the surface of iron minerals. This allows for the full dissociation of gold, silver, and iron mineral monomers, creating optimal particle size conditions for subsequent cyanide leaching and laying the foundation for efficient separation of magnetic flux and limonite, thereby simultaneously improving beneficiation indicators and concentrate quality. Finally, the "cyanide leaching-two-stage magnetic separation" process achieves efficient cascade recovery of gold, silver and iron, with recovery rate, grade and reagent consumption all superior to traditional processes. While maximizing resource utilization, it also enables the lightweighting of cyanide-containing tailings, reduces environmental risks at the source, and significantly lowers the cost of harmless treatment. Attached Figure Description

[0014] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0015] To make the technical problems and solutions solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Comparative Example 1

[0016] A 2000t / d beneficiation plant in Yunnan Province produces high-mud-content secondary oxidized gold-bearing iron ore. The raw ore composition and grade are as follows: aluminosilicate (clay minerals, chlorite, mica) 31.55%, carbonate (calcite, dolomite) 12.32%, Au 1.83g / t, Ag 36.5g / t, TFe 27.5%, mFe 5.10%.

[0017] The high-mud-content secondary oxidized gold-bearing iron ore in Example 1 was treated using a traditional "two-stage closed-circuit grinding and classification - whole-mud cyanide leaching - two-stage magnetic separation" beneficiation process. The specific steps are as follows: (1) Two-stage closed-circuit grinding and classification: The raw ore is fed into a ball mill for the first stage of open-circuit grinding, and then enters the second stage of closed-circuit grinding and classification system to obtain a slurry with 91.3% of the material being -200 mesh. This step involves fine grinding of all the ore without any pre-enrichment or pre-tailing, resulting in a large amount of soil and weathered rock entering the subsequent operations.

[0018] (2) Whole mud cyanide leaching: The whole mud slurry from step (1) is fed into the cyanide leaching system, and 8.75 kg / t of lime, 2.38 kg / t of sodium cyanide, and 30 g / t of activated carbon are added to obtain gold-loaded carbon and cyanide tailings. In this step, the leaching environment deteriorates because the slurry contains a large amount of mud, has high viscosity, and insufficient dissolved oxygen.

[0019] (3) Two-stage magnetic separation: The cyanide tailings from step (2) are fed into a weak magnetic separator with a magnetic field strength of 220 mT to obtain a weak magnetic concentrate (magnetite concentrate) and a weak magnetic tailings; the weak magnetic tailings are then fed into a strong magnetic separator with a magnetic field strength of 0.9 T to obtain a strong magnetic concentrate (limonite concentrate) and a strong magnetic tailings (final cyanide-containing tailings). In this step, due to severe mudification of the slurry, mud adheres to the surface of the magnetite, and fine-grained limonite is severely entrained with mud, resulting in poor recovery effect and quality, and a large amount of iron resources are lost.

[0020] The technical specifications for the entire process are shown in Table 1.

[0021]

[0022] Example 1 Taking a 2000t / d beneficiation plant in Yunnan Province as an example, the composition and grade of the raw ore are as follows: aluminosilicate (clay minerals, chlorite, mica) 30.47%, carbonate (calcite, dolomite) 13.65%, Au 1.88g / t, Ag 34.8g / t, TFe 29.2%, mFe 5.8%.

[0023] The process using the method described in this invention includes the following steps: (1) Grinding-gravity separation pre-tailing: The ore is fed into a semi-autogenous mill for grinding and washing to obtain a grinding slurry with 56.7% of -200 mesh. The grinding slurry is then sent to a hydrocyclone gravity separator for gravity separation to obtain gravity separation undersand and gravity separation overflow ore. (2) Two-stage magnetic separation and secondary enrichment: The gravity separation overflow ore from step (1) is fed into a magnetic separator with a magnetic field strength of 350mT for weak magnetic roughing to obtain weak magnetic rough concentrate and weak magnetic rough tailings; the weak magnetic rough tailings are then fed into a magnetic separator with a magnetic field strength of 1.0T for strong magnetic roughing to obtain strong magnetic rough concentrate and strong magnetic rough tailings, which are cyanide-free tailings; (3) Fine grinding and classification: The gravity separation sand from step (1), the weak magnetic coarse concentrate from step (2) and the strong magnetic coarse concentrate are combined and finely ground in a closed circuit to obtain a finely ground overflow ore with a content of -200 mesh of 92.1%. (4) Cyanide leaching: The finely ground overflow ore from step (3) is subjected to cyanide leaching by adding 4.86 kg / t of lime, 1.35 kg / t of sodium cyanide and 15 g / t of activated carbon to obtain gold-loaded carbon and cyanide tailings. (5) Two-stage magnetic separation to recover iron: The cyanide tailings from step (4) are sent to a magnetic separator with a magnetic field strength of 220mT for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic concentrate is the magnetite concentrate product. The weak magnetic tailings are sent to a magnetic separator with a magnetic field strength of 0.8T for strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings. The strong magnetic concentrate is the limonite concentrate product, and the strong magnetic tailings is the cyanide tailings. (6) Gold and silver refining and casting: The gold-loaded carbon from step (4) is subjected to traditional desorption-electrowinning-smelting-gold and silver separation-casting to obtain gold and silver ingots.

[0024] The production indicators for the entire process are shown in Table 2.

[0025]

[0026] Comparison between Example 1 and Comparative Example 1: Based on the comparison of production indicator data in Tables 1 and 2, Example 1 has the following significant improvements compared to Comparative Example 1: 1. Overall improvement in performance indicators (1) Gold and silver recovery rate: The gold leaching recovery rate increased from 90.16% to 93.98%, an increase of 2.8%; the silver recovery rate increased from 41.64% to 55.25%, an increase of 13.61%.

[0027] (2) Magnetite concentrate: the yield increased from 6.82% to 7.85%, an increase of 1.03%; the TFe grade increased from 60.06% to 61.82%, an increase of 1.76%. (3) Limonite concentrate: the yield increased significantly from 4.59% to 14.52%, an increase of 9.93%; the TFe grade increased from 49.72% to 51.50%, an increase of 1.78%.

[0028] 2. Drug consumption was significantly reduced. (1) Sodium cyanide consumption: decreased from 2.38 kg / t to 1.35 kg / t, a reduction of 43.28%, and the annual consumption decreased by 690.10 tons.

[0029] (2) Lime consumption per unit: decreased from 8.75 kg / t to 4.86 kg / t, a reduction of 44.46%, and the annual consumption decreased by 2606.30 tons.

[0030] (3) Activated carbon consumption: reduced from 30 g / t to 12 g / t, a decrease of 60.00%, and the annual consumption decreased by 13.68 tons.

[0031] 3. Outstanding environmental benefits (1) Reduction of cyanide tailings: The annual production was reduced from 593,500 tons (yield of 88.59%) to 263,700 tons (yield of 39.37%), a direct reduction of 329,700 tons / year, a reduction of 55.56%.

[0032] (2) Cyanide-free tailings generation: Example 1 removes 38.20% of cyanide-free tailings (yield) in advance, eliminating the need for expensive harmless treatment and significantly reducing environmental risks and environmental protection costs. Example 2

[0033] Taking a 3000t / d beneficiation plant in Yunnan Province as an example, the composition and grade of the raw ore are as follows: aluminosilicate (clay minerals, chlorite, mica) 25.47%, carbonate (calcite, dolomite) 18.55%, Au 1.51g / t, Ag 26.41g / t, TFe 26.22%, mFe 5.82%.

[0034] The process using the method described in this invention includes the following steps: (1) Grinding-gravity separation pre-tailing: The ore is fed into a semi-autogenous mill for grinding and washing to obtain a grinding slurry with 55%-60% of -200 mesh. The grinding slurry is then sent to a hydrocyclone gravity separator for gravity separation to obtain gravity-separated sand and gravity-separated overflow ore. (2) Two-stage magnetic separation and secondary enrichment: The gravity separation overflow ore from step (1) is fed into a magnetic separator with a magnetic field strength of 220mT for weak magnetic roughing to obtain weak magnetic rough concentrate and weak magnetic rough tailings; the weak magnetic rough tailings are then fed into a magnetic separator with a magnetic field strength of 0.8T for strong magnetic roughing to obtain strong magnetic rough concentrate and strong magnetic rough tailings, which are cyanide-free tailings; (3) Fine grinding and classification: The gravity separation sand from step (1), the weak magnetic coarse concentrate from step (2) and the strong magnetic coarse concentrate are combined and finely ground in a closed circuit to obtain a finely ground overflow ore with a content of -200 mesh of 90%-93%. (4) Cyanide leaching: The finely ground overflow ore from step (3) is subjected to cyanide leaching by adding 4.23 kg / t of lime, 1.22 kg / t of sodium cyanide and 11 g / t of activated carbon to obtain gold-loaded carbon and cyanide tailings; (5) Two-stage magnetic separation to recover iron: The cyanide tailings from step (4) are sent to a magnetic separator with a magnetic field strength of 160mT for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic concentrate is the magnetite concentrate product. The weak magnetic tailings are sent to a magnetic separator with a magnetic field strength of 0.6T for strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings. The strong magnetic concentrate is the limonite concentrate product, and the strong magnetic tailings is the cyanide tailings. (6) Gold and silver refining and casting: The gold-loaded carbon from step (4) is subjected to traditional desorption-electrowinning-smelting-gold and silver separation-casting to obtain gold and silver ingots.

[0035] The production indicators for the entire process are shown in Table 3.

[0036]

[0037] Comparison between Example 2 and Comparative Example 1: Based on the comparison of production index data in Tables 1 and 3, Example 2 has the following significant improvements compared to Comparative Example 1: 1. Overall improvement in performance indicators (1) Gold and silver recovery rate: The gold leaching recovery rate increased from 90.16% to 92.71%, an increase of 1.55%; the silver recovery rate increased from 41.64% to 47.09%, an increase of 5.45%.

[0038] (2) Magnetite concentrate: the yield increased from 6.82% to 7.96%, an increase of 1.14%; the TFe grade increased from 60.06% to 61.36%, an increase of 1.30%. (3) Limonite concentrate: the yield increased significantly from 4.59% to 12.66%, an increase of 7.05%; the TFe grade increased from 49.72% to 50.48%, an increase of 0.76%.

[0039] 2. Drug consumption was significantly reduced. (1) Sodium cyanide consumption: decreased from 2.38 kg / t to 1.22 kg / t, a reduction of 48.73%, and the annual consumption decreased by 1148.4 tons.

[0040] (2) Lime consumption per unit: decreased from 8.75 kg / t to 4.23 kg / t, a reduction of 51.66%, and the annual consumption decreased by 4474.40 tons.

[0041] (3) Activated carbon consumption: decreased from 30 g / t to 11 g / t, a reduction of 63.33%, and the annual consumption decreased by 81.81 tons.

[0042] 3. Outstanding environmental benefits (1) Reduction of cyanide tailings: The annual production was reduced from 877,000 tons (yield of 88.59%) to 323,200 tons (yield of 32.65%), a direct reduction of 550,500 tons / year, a reduction of 62.77%.

[0043] (2) Cyanide-free tailings generation: This invention removes 41.79% of cyanide-free tailings (yield) in advance, eliminating the need for expensive harmless treatment and significantly reducing environmental risks and environmental protection costs.

[0044] In summary, this invention, through the synergistic effect of "grinding-gravity separation pre-tailings removal" and "weak magnetic-strong magnetic secondary enrichment," removes 41.79% of the mud and weathered rock in advance, reducing the amount of ore entering the cyanidation operation from 100% to 58.21%. This is the fundamental reason for achieving reagent savings, improved indicators, and reduced tailings. Traditional processes, due to the fine grinding of the entire mud and the cyanidation of the entire ore, result in a severely deteriorated mud quality and working environment, leading to insufficient leaching of gold and silver, difficulty in recovering iron minerals, high reagent consumption, and high cyanide-containing tailings.

[0045] The present invention has been described in detail above through specific and preferred embodiments. However, those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for processing gold-bearing iron ore with high mud content secondary oxidation, characterized in that, Includes the following steps: (1) Grinding-gravity separation pre-tailing: The ore is fed into a semi-autogenous mill for grinding and washing to obtain a grinding slurry with 55%-60% of -200 mesh. The grinding slurry is then sent to a hydrocyclone gravity separator for gravity separation to obtain gravity-separated sand and gravity-separated overflow ore. (2) Two-stage magnetic separation and secondary enrichment: The gravity separation overflow ore from step (1) is fed into a magnetic separator with a magnetic field strength of 220-350mT for weak magnetic roughing to obtain weak magnetic rough concentrate and weak magnetic rough tailings; the weak magnetic rough tailings are then fed into a magnetic separator with a magnetic field strength of 0.8-1.0T for strong magnetic roughing to obtain strong magnetic rough concentrate and strong magnetic rough tailings, which are cyanide-free tailings; (3) Fine grinding and classification: The gravity separation sand from step (1), the weak magnetic rough concentrate from step (2) and the strong magnetic rough concentrate are combined and finely ground in a closed circuit to obtain a finely ground overflow ore with a content of -200 mesh accounting for 90%-93%. (4) Cyanide leaching: The finely ground overflow ore from step (3) is subjected to cyanide leaching, and lime, sodium cyanide and activated carbon are added to obtain gold-loaded carbon and cyanide tailings; (5) Two-stage magnetic separation to recover iron: The cyanide tailings from step (4) are sent to a magnetic separator with a magnetic field strength of 160-220mT for weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings. The weak magnetic concentrate is the magnetite concentrate product. The weak magnetic tailings are sent to a magnetic separator with a magnetic field strength of 0.6-0.8T for strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings. The strong magnetic concentrate is the limonite concentrate product, and the strong magnetic tailings is the cyanide tailings.

2. The method for processing high-mud-content secondary oxidized gold-bearing iron ore according to claim 1, characterized in that, The amount of reagents added in step (4) is: 4 kg / t-5 kg / t of lime, 1.0 kg / t-1.5 kg / t of sodium cyanide, and 10 g / t-15 g / t of activated carbon.

3. The method for processing high-mud-content secondary oxidized gold-bearing iron ore according to claim 1, characterized in that, In step (2), the magnetic field strength for weak magnetic coarse selection is 350 mT, and the magnetic field strength for strong magnetic coarse selection is 1.0 T; in step (5), the magnetic field strength for weak magnetic fine selection is 220 mT, and the magnetic field strength for strong magnetic fine selection is 0.8 T.

4. The method for processing high-mud-content secondary oxidized gold-bearing iron ore according to claim 1, characterized in that, The gold-loaded carbon from step (4) is subjected to conventional desorption-electrowinning-smelting-gold-silver separation-casting to obtain gold and silver ingots.

5. The method for processing high-mud-content secondary oxidized gold-bearing iron ore according to claim 1, characterized in that, The method is applicable to high-mud-content secondary oxidized gold-bearing iron ore with a mineral clay mainly composed of aluminosilicates (25%-35%), carbonates (10%-20%), Au (1.5g / t-3.0g / t), Ag (25g / t-40g / t), TFe (25%-33%), and mFe (5%-8%).

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