Method for enriching gold from ore material containing low-grade gold
By using processes such as thickening and de-refining, classification, regrinding and flotation, gold is enriched from ores containing low-grade gold. This solves the problems of large reagent consumption and complex processes in existing technologies, and achieves improved gold grade and reduced costs, making it suitable for industrial applications.
Patent Information
- Application Number
- CN202511901341.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-03-17
AI Technical Summary
Existing technologies are not effective and economical for enriching gold from ores containing low-grade gold, especially micro- and submicro-gold with fine-grained dissemination. Furthermore, existing methods suffer from problems such as large reagent consumption, complex processes, and high costs.
By employing processes such as thickening and de-refining, classification, regrinding, and flotation, combined with ceramic grinding media and specific reagents, gold is enriched from ore materials containing low-grade gold through thickening and de-refining, classification, regrinding, and flotation steps, using a small amount of reagents and a simple process flow.
It has achieved an increase in gold grade to 2 g/t and above, meeting the sales pricing standard, reducing the processing volume of subsequent smelting operations, reducing reagent usage and equipment complexity, and has both environmental and economic benefits, and is easy to apply industrially.
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Figure CN121669418A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of mineral resource development, and relates to a method for enriching gold from ore materials containing low-grade gold. BACKGROUND
[0002] Common ore materials containing low-grade gold include sulfur concentrates or copper-sulfur separation tailings, and particularly when the gold grade in these ore materials is low, such as less than 2 g / t, these ore materials containing low-grade gold cannot be effectively utilized due to limited technical costs.
[0003] Compared with direct pyrometallurgical or hydrometallurgical processes, physical enrichment methods often have cost advantages, however, micro-fine gold, sub-micro-fine gold and other micro-fine particles of invisible gold are mainly contained in low-grade gold-containing sulfur concentrates or copper-sulfur separation tailings, and these gold is wrapped or impregnated in the sulfur concentrate, which makes it difficult to realize the recovery and utilization of gold in low-grade gold-containing sulfur concentrates or copper-sulfur separation tailings by using conventional physical enrichment methods. In addition, the existing methods for enriching low-grade gold ore also have the following disadvantages: (a) the adopted reagents are difficult to realize the enrichment of low-grade gold; (b) the amount of reagents is large, which is difficult to reduce the recovery cost; (c) the process flow is complex, which is difficult to promote and utilize.
[0004] Therefore, it is beneficial to realize the effective utilization of ore materials containing low-grade gold to obtain a method for enriching gold from ore materials containing low-grade gold, which has simple process, convenient operation, less types and low amount of reagents, and low cost. SUMMARY
[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a method for enriching gold from ore materials containing low-grade gold, which has simple process, convenient operation, less types and low amount of reagents, and low cost.
[0006] To solve the above technical problems, the following technical solutions are adopted.
[0007] A method for enriching gold from ore materials containing low-grade gold, which adopts any of the following methods to enrich gold from ore materials containing low-grade gold or high-gold-containing sulfide minerals; Method one, comprising the following steps: (1.1) Slurry is prepared from ore materials containing low-grade gold, and a desorption reagent is added for desorption and concentration to obtain a slurry A; the ore materials containing low-grade gold are low-grade gold-containing sulfur concentrates; (1.2) The slurry A obtained in step (1.1) is classified to obtain a fine particle product and a coarse particle product; (1.3) The coarse particle product obtained in step (1.2) is re-ground to obtain a slurry B; (1.4) mixing the fine fraction product obtained in step (1.2) and the slurry B obtained in step (1.3), adding a beneficiation reagent to perform flotation, to obtain a flotation concentrate and a flotation tailing; Mode two, comprising the following steps: (2.1) performing slurry making on a low-grade gold-containing ore material, adding a de-drugging reagent to perform thickening de-drugging, to obtain a slurry A; the low-grade gold-containing ore material is a low-grade gold-containing sulphur concentrate; (2.2) performing regrinding on the slurry A obtained in step (2.1), to obtain a slurry B; (2.3) adding a beneficiation reagent to the slurry B obtained in step (2.2) to perform flotation, to obtain a flotation concentrate and a flotation tailing; Mode three, comprising the following steps: (3.1) performing slurry making on a low-grade gold-containing ore material, adding a de-drugging reagent to perform thickening de-drugging, to obtain a slurry A; the low-grade gold-containing ore material is a low-grade gold-containing sulphur concentrate; (3.2) adding a beneficiation reagent to the slurry A obtained in step (3.1) to perform flotation, to obtain a flotation concentrate and a flotation tailing A; (3.3) performing classification on the flotation tailing A obtained in step (3.2), to obtain a fine fraction product and a coarse fraction product; (3.4) performing regrinding on the coarse fraction product obtained in step (3.3), to obtain a slurry B and a flotation tailing B; (3.5) returning the slurry B obtained in step (3.3) to step (3.2) to perform flotation; Mode four, comprising the following steps: (4.1) performing regrinding on a low-grade gold-containing ore material, to obtain a slurry; the low-grade gold-containing ore material is a low-grade gold-containing copper-sulphur separation tailing; (4.2) adding a beneficiation reagent to the slurry obtained in step (4.1) to perform flotation, to obtain a flotation concentrate and a flotation tailing; Mode five, comprising the following steps: (5.1) adding a beneficiation reagent to a low-grade gold-containing ore material to perform flotation, to obtain a flotation concentrate and a flotation tailing A; (5.2) performing classification on the flotation tailing A obtained in step (5.1), to obtain a fine fraction product and a coarse fraction product; the low-grade gold-containing ore material is a low-grade gold-containing copper-sulphur separation tailing; (5.3) performing regrinding on the coarse fraction product obtained in step (5.2), to obtain a slurry; (5.4) returning the slurry obtained in step (5.3) to step (5.1) to perform flotation; Mode six, comprising the following steps: (6.1) grading the low-grade gold-containing ore material to obtain a fine fraction product and a coarse fraction product; the low-grade gold-containing ore material is a low-grade gold-containing copper-sulfur separation tailings; (6.2) regrinding the coarse fraction product obtained in step (6.1) to obtain a slurry; (6.3) mixing the fine fraction product obtained in step (6.1) and the slurry obtained in step (6.2), adding beneficiation reagents for flotation to obtain a flotation concentrate and a flotation tailings.
[0008] The method described above is further improved, in step (1.1), the thickening and drug removal is carried out in a thickener or a stirring barrel.
[0009] The method described above is further improved, in step (1.2), a classification device is used to classify the slurry A obtained in step (1.1); the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; the vibrating screen is a high-frequency vibrating fine screen.
[0010] The method described above is further improved, in step (1.3), a regrinding machine with ceramic grinding medium is used to regrind the coarse fraction product obtained in step (1.2).
[0011] The method described above is further improved, in step (2.1), the thickening and drug removal is carried out in a thickener or a stirring barrel.
[0012] The method described above is further improved, in step (2.2), a regrinding machine with ceramic grinding medium is used to regrind the slurry A obtained in step (2.1).
[0013] The method described above is further improved, in step (3.1), the thickening and drug removal is carried out in a thickener or a stirring barrel. The method described above is further improved, in step (3.3), a classification device is used to classify the flotation tailings A obtained in step (3.2); the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; the vibrating screen is a high-frequency vibrating fine screen.
[0014] The method described above is further improved, in step (3.4), a regrinding machine with ceramic grinding medium is used to regrind the coarse fraction product obtained in step (3.3).
[0015] The method described above is further improved, in step (4.1), a regrinding machine with ceramic grinding medium is used to regrind the low-grade gold-containing ore material.
[0016] The method is further improved, and in the step (5.2), the flotation tailings A obtained in the step (5.1) is classified by using a classification device; the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; and the vibrating screen is a high-frequency vibrating fine screen.
[0017] The method is further improved, and in the step (5.3), the coarse-grained product obtained in the step (5.2) is re-ground by using a re-grinding machine with a ceramic grinding medium.
[0018] The method is further improved, and in the step (6.1), the low-grade gold-containing ore material is classified by using a classification device; the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; and the vibrating screen is a high-frequency vibrating fine screen.
[0019] The method is further improved, and in the step (6.2), the coarse-grained product obtained in the step (6.1) is re-ground by using a re-grinding machine with a ceramic grinding medium.
[0020] The method is further improved, and the low-grade gold-containing ore material has a gold grade of ≤2 g / t; and the copper-sulfur separation tailings are at least one of gold-containing copper-sulfur separation tailings, gold-containing lead-sulfur separation tailings and gold-containing zinc-sulfur separation tailings.
[0021] The method is further improved, and the drug removal agent is at least one of activated carbon, sodium sulfide, water and an oxidation-reduction agent.
[0022] The method is further improved, and the ore dressing agent comprises at least one of an inhibitor, a collector and a frother.
[0023] The method is further improved, and the inhibitor is at least one of dextrin, hydrogen peroxide, sodium pyrosulfite, KDY-2, golden cicada, YZ-1, BK506, KDY, calcium hypochlorite and lime; and the addition amount of the inhibitor is 0.2 kg / t-6 kg / t.
[0024] The method is further improved, and the collector is at least one of xanthate and derivatives thereof; and the addition amount of the collector is 50 g / t-200 g / t.
[0025] The method is further improved, and the frother is methyl isobutyl carbinol; and the addition amount of the frother is 10 g / t-100 g / t.
[0026] Compared with the prior art, the method has the following advantages: (1) In the present application, through the combined action of concentration, drug removal, classification, regrinding, flotation and other processes, gold or high gold-bearing sulfide minerals in sulfur concentrate or copper-sulfur separation tailings and other materials can be effectively enriched, so that the gold grade in the final product is increased to 2 g / t and above, thereby reaching the sales pricing standard or increasing the pricing coefficient of gold in the concentrate, not only effectively solving the problem of recovery of associated gold and silver noble metals in sulfur concentrate or copper-sulfur separation tailings, but also reducing the processing capacity of subsequent smelting operations, realizing the dual improvement of environmental and economic benefits, and also having the advantages of simple process flow, simple equipment operation, few types of reagents used and low dosage, low operating cost, reasonable technical and economic performance, and easy industrial application.
[0027] (2) In the present application, it is innovatively proposed to directly preferentially float gold, silver and other noble metals from copper-sulfur separation tailings, which eliminates the drug removal process, drug removal reagents (such as activated carbon, sodium sulfide, etc.) and drug removal equipment (such as a thickener) for gold selection from sulfur concentrate. In addition, direct flotation of gold, silver and other metals from copper-sulfur separation tailings can greatly reduce the dosage of pyrite depressants (such as calcium hypochlorite, lime, sodium metabisulfite, etc.) or even completely eliminate the addition of pyrite depressants.
[0028] (3) In the present application, gold in sulfur concentrate or copper-sulfur separation tailings containing low-grade gold can be effectively enriched, thereby increasing the gold grade in the concentrate product. At the same time, the use of a regrinding machine with ceramic media such as an IsaMill can avoid iron impurity pollution from the source, and the built-in classification function can effectively avoid problems such as decreased mineral recovery rate and difficult concentrate dewatering caused by overgrinding. BRIEF DESCRIPTION OF DRAWINGS
[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.
[0030] Figure 1 It is a process flow diagram for enriching gold from sulfur concentrate in the present application embodiment 1.
[0031] Figure 2 It is a process flow diagram for enriching gold from sulfur concentrate in the present application embodiments 2 and 3.
[0032] Figure 3 It is a process flow diagram for enriching gold from sulfur concentrate in the present application embodiment 4.
[0033] Figure 4 It is a process flow diagram for enriching gold from copper-sulfur separation tailings in the present application embodiment 5.
[0034] Figure 5 It is a process flow diagram for enriching gold from copper-sulfur separation tailings in the present application embodiment 6.
[0035] Figure 6 Process flow diagram for the process of enriching gold from tailings of copper-sulfur separation in Example 7 of the present application. DETAILED DESCRIPTION
[0036] The present application is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but it will be understood that the scope of the present application is not limited to the specific embodiments described.
[0037] It is necessary to point out that the following examples are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the specific implementation of the present application according to the above description of the present application, which still belongs to the scope of protection of the present application.
[0038] Example 1: A method for enriching gold from ore materials containing low-grade gold, specifically, enriching gold from a sulfur concentrate containing low-grade gold, as shown in the following process flow diagram, comprising the following steps: Figure 1 (1.1) Slurry is made from ore materials containing low-grade gold, and a de-drugging agent (activated carbon) is added for de-drugging and thickening to obtain slurry A and overflow water.
[0039] In this step (1.1), the ore materials containing low-grade gold used are sulfur concentrates containing low-grade gold. The gold grade in the sulfur concentrate containing low-grade gold is between 1.4-1.7 g / t. The gold in the sulfur concentrate is micro-fine particle inclusions, and the particle size of the gold particles is mostly below 10 μm, which is difficult to effectively enrich and recover by conventional beneficiation methods.
[0040] (1.2) Wet screening is performed on the slurry A obtained in step (1.1) using a standard screen with a screen aperture size of 25 μm. By classifying the slurry A, a fine particle product (undersize product) and a coarse particle product (oversize product) are obtained.
[0041] (1.3) The coarse particle product obtained in step (1.2) is re-ground using a ceramic grinding medium re-grinder until the proportion of -600 mesh is 99% (i.e. 99% of the product weight corresponds to a particle size of less than 25 μm), to obtain slurry B.
[0042] (1.4) The fine particle product obtained in step (1.2) and the slurry B obtained in step (1.3) are mixed, and beneficiation reagents are added for flotation. Specifically, 3 kg / t of sodium pyrosulfite (inhibitor) is first added, stirred and slurried for 5 minutes, then 100 g / t of collector (diammonium black drug) and 50 g / t of frother methyl isobutyl carbinol (MIBC) are added in sequence, and floated for 10 minutes to obtain a flotation concentrate (high gold content) and a flotation tailings (low gold content).
[0043] In Example 1 of this invention, a high-gold-bearing sulfur concentrate with a gold grade of 2.0 g / t and a gold recovery rate of 38.2% can be obtained.
[0044] Example 2: A method for enriching gold from low-grade gold ore materials, specifically: enriching gold from low-grade gold sulfur concentrate, such as... Figure 2 As shown, it includes the following steps: (1.1) The ore material containing low-grade gold is pulped, and de-drug agent (activated carbon) is added for thickening and de-drug removal to obtain slurry A and overflow water.
[0045] In step (1.1), the ore material used is a low-grade gold-bearing sulfur concentrate. The gold grade in this low-grade gold-bearing sulfur concentrate is between 0.5-1.0 g / t. In this sulfur concentrate, the gold is encapsulated in fine particles, with the particle size mostly below 10 μm, making it difficult to achieve effective enrichment and recovery through conventional beneficiation methods.
[0046] (1.2) The slurry A obtained in step (1.1) is regrinded using a regrinding mill with ceramic grinding media until 90% of the product is -400 mesh (i.e., 90% of the product weight corresponds to a particle size of less than 38µm), thus obtaining slurry B.
[0047] (1.3) Add mineral processing reagents to the slurry B obtained in step (1.2) for flotation. Specifically, first add 1 kg / t of KDY-2 (pyrite inhibitor), stir and adjust the slurry for 5 minutes, then add 50 g / t of collector (butanol black reagent), and float for 7 minutes to obtain flotation concentrate (high gold content) and flotation tailings (low gold content).
[0048] In Example 2 of this invention, a high-gold-bearing sulfur concentrate with a gold grade of 2.01 g / t and a gold recovery rate of 19.74% can be obtained.
[0049] Example 3: A method for enriching gold from low-grade gold ore materials, specifically: enriching gold from low-grade gold sulfur concentrate, such as... Figure 2 As shown, it includes the following steps: (1.1) The ore material containing low-grade gold is pulped, and de-drug agent (activated carbon) is added for thickening and de-drug removal to obtain slurry A and overflow water.
[0050] In step (1.1), the ore material used is a low-grade gold-bearing sulfur concentrate. The gold grade in this low-grade gold-bearing sulfur concentrate is between 1.4 and 1.7 g / t. In this sulfur concentrate, the gold is encapsulated in fine particles, with the particle size mostly below 10 μm, making it difficult to achieve effective enrichment and recovery through conventional beneficiation methods.
[0051] (1.2) The slurry A obtained in step (1.1) is regrinded using a regrinding mill with ceramic grinding media until 99% of the product is -600 mesh (i.e., 99% of the product weight corresponds to a particle size of less than 25 µm), thus obtaining slurry B.
[0052] (1.3) Add mineral processing reagents to the slurry B obtained in step (1.2) for flotation. Specifically, first add 3 kg / t of sodium metabisulfite (inhibitor), stir and adjust the slurry for 5 minutes, then add 100 g / t of collector (butylammonium black reagent) and 50 g / t of frother methyl isobutyl methanol (MIBC) in sequence, and float for 10 minutes to obtain flotation concentrate (high gold content) and flotation tailings (low gold content).
[0053] Tests have shown that high-gold-content sulfur concentrate with a gold grade of 2 g / t or higher can be obtained in Example 3 of this invention.
[0054] Example 4: A method for enriching gold from low-grade gold ore materials, specifically: enriching gold from low-grade gold sulfur concentrate, such as... Figure 3 As shown, it includes the following steps: (1.1) The ore material containing low-grade gold is pulped, and a de-drug agent is added for thickening and de-drug removal to obtain slurry A and overflow water.
[0055] In step (1.1), the ore material used is a low-grade gold-bearing sulfur concentrate. The gold grade in this low-grade gold-bearing sulfur concentrate is between 1.4 and 1.7 g / t. In this sulfur concentrate, the gold is encapsulated in fine particles, with the particle size mostly below 10 μm, making it difficult to achieve effective enrichment and recovery through conventional beneficiation methods.
[0056] (1.2) Add mineral processing reagents to the slurry A obtained in step (1.1) for flotation. Specifically, first add 3 kg / t of sodium metabisulfite (inhibitor), stir and adjust the slurry for 5 minutes, then add 100 g / t of collector (butylammonium black reagent) and 50 g / t of frother (methyl isobutyl methanol MIBC) in sequence, and float for 10 minutes to obtain flotation concentrate (high gold content) and flotation tailings A.
[0057] (1.3) The flotation tailings A obtained in step (1.2) were wet screened (classified) using a standard sieve (sieve aperture 25 µm) to obtain flotation tailings B with low gold content (classification overflow) and coarse-grained product (classification sediment).
[0058] (1.4) The coarse-grained product obtained in step (1.3) is regrinded using a regrinding mill with ceramic grinding media until 99% of the product is -600 mesh (i.e., 99% of the product weight corresponds to a particle size of less than 25 µm), to obtain slurry B.
[0059] (1.5) Return the slurry B obtained in step (1.4) to step (1.2) for flotation.
[0060] Tests have shown that high-gold-content sulfur concentrate with a gold grade of 2 g / t or higher can be obtained in Example 4 of this invention.
[0061] Example 5: A method for enriching gold from low-grade gold ore materials specifically involves enriching gold from copper-sulfur separation tailings containing low-grade gold, such as... Figure 4 As shown, it includes the following steps: (1.1) The ore material used is copper-sulfur separation tailings containing low-grade gold. The gold grade in this copper-sulfur separation tailings is between 1.0 and 1.4 g / t. In this tailings, the gold is encapsulated in fine particles, with the particle size mostly below 10 μm, making it difficult to achieve effective enrichment and recovery through conventional beneficiation methods.
[0062] (1.2) The copper-sulfur separation tailings in step (1.1) are regrinded using a regrinding mill with ceramic grinding media until 99% of the product is -600 mesh (i.e., 99% of the product weight corresponds to a particle size of less than 25 µm) to obtain a slurry.
[0063] (1.3) Add mineral processing reagents to the slurry obtained in step (1.2) for flotation. Specifically, first add 4 kg / t of sodium metabisulfite (inhibitor), stir and adjust the slurry for 5 minutes, then add 200 g / t of collector (butyl ammonium black reagent) and 80 g / t of frother (methyl isobutyl methanol MIBC) in sequence, and float for 10 minutes to obtain flotation concentrate (high gold content) and flotation tailings (low gold content).
[0064] In Example 5 of this invention, a high-gold-bearing sulfur concentrate with a gold grade of 3.53 g / t and a gold recovery rate of 28.3% can be obtained.
[0065] Example 6: A method for enriching gold from low-grade gold ore materials specifically involves enriching gold from copper-sulfur separation tailings containing low-grade gold, such as... Figure 5 As shown, it includes the following steps: (1.1) The ore material used is copper-sulfur separation tailings containing low-grade gold. The gold grade in this copper-sulfur separation tailings is between 1.0 and 1.4 g / t. In this tailings, the gold is encapsulated in fine particles, with the particle size mostly below 10 μm, making it difficult to achieve effective enrichment and recovery through conventional beneficiation methods.
[0066] (1.2) Add mineral processing reagents to the copper-sulfur separation tailings containing low-grade gold obtained in step (1.1) for flotation. Specifically, first add 4 kg / t of sodium metabisulfite (inhibitor), stir and adjust the slurry for 5 minutes, then add 200 g / t of collector (butyl ammonium black reagent) and 80 g / t of frother (methyl isobutyl methanol MIBC) in sequence, and float for 10 minutes to obtain flotation concentrate (high gold content) and flotation tailings A).
[0067] (1.3) The flotation tailings A obtained in step (1.2) were wet screened (classified) using a standard sieve (sieve aperture 25 µm) to obtain flotation tailings B with low gold content (classification overflow) and coarse-grained product (classification sediment).
[0068] (1.4) The coarse-grained product obtained in step (1.3) is regrinded using a regrinding mill with ceramic grinding media until 99% of the product is -600 mesh (i.e., 99% of the product weight corresponds to a particle size of less than 25 µm) to obtain a slurry.
[0069] (1.5) Return the slurry obtained in step (1.4) to step (1.2) for flotation.
[0070] Tests have shown that high-gold-content sulfur concentrate with a gold grade of 2 g / t or higher can be obtained in Example 6 of this invention.
[0071] Example 7: A method for enriching gold from low-grade gold ore materials specifically involves enriching gold from copper-sulfur separation tailings containing low-grade gold, such as... Figure 6 As shown, it includes the following steps: (1.1) The ore material used is copper-sulfur separation tailings containing low-grade gold. The gold grade in this copper-sulfur separation tailings is between 1.0 and 1.4 g / t. In this tailings, the gold is encapsulated in fine particles, with the particle size mostly below 10 μm, making it difficult to achieve effective enrichment and recovery through conventional beneficiation methods.
[0072] (1.2) The copper-sulfur separation tailings containing low-grade gold obtained in step (1.1) were wet screened (classified) using a standard sieve (sieve aperture 25 µm) to obtain fine-grained product (classification overflow) and coarse-grained product (classification sediment).
[0073] (1.3) The coarse-grained product obtained in step (1.2) is regrinded using a regrinding mill with ceramic grinding media until 99% of the product is -600 mesh (i.e., 99% of the product weight corresponds to a particle size of less than 25 µm) to obtain a slurry.
[0074] (1.4) Mix the fine-grained product obtained in step (1.2) with the slurry obtained in step (1.4), add mineral processing reagents for flotation, specifically: first add 4 kg / t sodium metabisulfite (inhibitor), stir and adjust the slurry for 5 minutes, then add 200 g / t collector (butyl ammonium black reagent) and 80 g / t frother (methyl isobutyl methanol MIBC) in sequence, and float for 10 minutes to obtain flotation concentrate (high gold content) and flotation tailings (low gold content).
[0075] Tests have shown that high-gold-content sulfur concentrate with a gold grade of 2 g / t or higher can be obtained in Example 7 of this invention.
[0076] Based on the above results, compared with conventional gold enrichment methods, the method of the present invention for enriching gold from ore containing low-grade gold can bring the following unexpected technical effects: (1) In this invention, through the combined action of processes such as concentration, de-removal, classification, regrinding and flotation, gold or high gold-containing sulfide minerals in materials such as sulfur concentrate or copper-sulfur separation tailings can be effectively enriched, so that the gold grade in the final product is increased to 2 g / t or above, thereby meeting the sales pricing standard or increasing the pricing coefficient of gold in the concentrate. This not only effectively solves the problem of difficult recovery of associated gold and silver precious metals in sulfur concentrate or copper-sulfur separation tailings, but also reduces the processing volume of subsequent smelting operations, achieving a dual improvement in environmental and economic benefits. At the same time, it also has the advantages of simple process flow, simple equipment operation, few types of reagents used and low dosage, low operating cost, and reasonable technical and economic efficiency, making it easy to realize industrial application.
[0077] (2) This invention innovatively proposes the direct preferential flotation of precious metals such as gold and silver from copper-sulfur separation tailings, eliminating the need for de-reagent processes, de-reagents (such as activated carbon, sodium sulfide, etc.), and de-reagent equipment (such as thickeners) in gold extraction from sulfur concentrate. Furthermore, the direct flotation recovery of gold and silver from copper-sulfur separation tailings can significantly reduce the amount of pyrite inhibitors (such as calcium hypochlorite, lime, sodium metabisulfite, etc.) used, or even eliminate the need for pyrite inhibitors altogether.
[0078] (3) In this invention, gold in sulfur concentrates or copper-sulfur separation tailings containing low-grade gold can be effectively enriched, thereby improving the gold grade in the concentrate product. At the same time, the use of ceramic media regrinding mills such as IsaMill can avoid iron impurity contamination from the source, and its built-in classification function effectively avoids problems such as decreased mineral recovery rate and difficulty in concentrate dewatering caused by over-grinding.
[0079] Therefore, the method of the present invention not only effectively solves the problem of difficult recovery of associated low-grade gold and silver precious metals in sulfur concentrate or copper-sulfur separation tailings, but also reduces the processing volume of subsequent smelting operations, achieving a dual improvement in environmental and economic benefits. It has the advantages of simple process flow, simple equipment operation, few types and low dosage of reagents, low operating costs, and reasonable technical and economic efficiency, and is easy to realize industrial application.
[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.
Claims
1. A method for enriching gold from a low-grade gold-containing ore material, characterized in that, Any one of the following ways is adopted to enrich gold from low-grade gold-containing ore materials or high-gold-containing sulfide minerals; The method one comprises the following steps: (1.1) Slurry is made from low-grade gold-containing ore materials, and a de-drugging agent is added for thickening and de-drugging to obtain ore slurry A; the low-grade gold-containing ore materials are low-grade gold-containing sulfur concentrates; (1.2) The ore slurry A obtained in step (1.1) is classified to obtain fine particle product and coarse particle product; (1.3) The coarse particle product obtained in step (1.2) is re-ground to obtain ore slurry B; (1.4) The fine particle product obtained in step (1.2) and the ore slurry B obtained in step (1.3) are mixed, and a beneficiation agent is added for flotation to obtain flotation concentrate and flotation tailings; The method two comprises the following steps: (2.1) Slurry is made from low-grade gold-containing ore materials, and a de-drugging agent is added for thickening and de-drugging to obtain ore slurry A; the low-grade gold-containing ore materials are low-grade gold-containing sulfur concentrates; (2.2) The ore slurry A obtained in step (2.1) is re-ground to obtain ore slurry B; (2.3) A beneficiation agent is added to the ore slurry B obtained in step (2.2) for flotation to obtain flotation concentrate and flotation tailings; The method three comprises the following steps: (3.1) Slurry is made from low-grade gold-containing ore materials, and a de-drugging agent is added for thickening and de-drugging to obtain ore slurry A; the low-grade gold-containing ore materials are low-grade gold-containing sulfur concentrates; (3.2) A beneficiation agent is added to the ore slurry A obtained in step (3.1) for flotation to obtain flotation concentrate and flotation tailings A; (3.3) The flotation tailings A obtained in step (3.2) are classified to obtain fine particle product and coarse particle product; (3.4) The coarse particle product obtained in step (3.3) is re-ground to obtain ore slurry B and flotation tailings C; (3.5) The ore slurry B obtained in step (3.3) is returned to step (3.2) for flotation; The method four comprises the following steps: (4.1) The low-grade gold-containing ore materials are re-ground to obtain ore slurry; the low-grade gold-containing ore materials are copper-sulfur separation tailings containing low-grade gold; (4.2) A beneficiation agent is added to the ore slurry obtained in step (4.1) for flotation to obtain flotation concentrate and flotation tailings; The method five comprises the following steps: (5.1) A beneficiation agent is added to low-grade gold-containing ore materials for flotation to obtain flotation concentrate and flotation tailings A; the low-grade gold-containing ore materials are copper-sulfur separation tailings containing low-grade gold; (5.2) The flotation tailings A obtained in step (5.1) are classified to obtain fine particle product and coarse particle product; (5.3) The coarse particle product obtained in step (5.2) is re-ground to obtain ore slurry; (5.4) The ore slurry obtained in step (5.3) is returned to step (5.1) for flotation; The method six comprises the following steps: (6.1) The low-grade gold-containing ore materials are classified to obtain fine particle product and coarse particle product; the low-grade gold-containing ore materials are copper-sulfur separation tailings containing low-grade gold; (6.2) regrinding the coarse-grained product obtained in step (6.1) to obtain a slurry; (6.3) mixing the fine-grained product obtained in step (6.1) and the slurry obtained in step (6.2), adding a beneficiation agent to perform flotation to obtain a flotation concentrate and a flotation tailing.
2. The method of claim 1, wherein, In step (1.1), the thickening and desorption is performed in a thickener or a stirring barrel; In step (1.2), the slurry A obtained in step (1.1) is classified by using a classification device; the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; the vibrating screen is a high-frequency vibrating fine screen; In step (1.3), the coarse-grained product obtained in step (1.2) is regrinded by using a regrinding machine with ceramic grinding medium.
3. The method of claim 1, wherein, In step (2.1), the thickening and desorption is performed in a thickener or a stirring barrel; In step (2.2), the slurry A obtained in step (2.1) is regrinded by using a regrinding machine with ceramic grinding medium.
4. The method of claim 1, wherein, In step (3.1), the thickening and desorption is performed in a thickener or a stirring barrel; In step (3.3), the flotation tailing A obtained in step (3.2) is classified by using a classification device; the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; the vibrating screen is a high-frequency vibrating fine screen; In step (3.4), the coarse-grained product obtained in step (3.3) is regrinded by using a regrinding machine with ceramic grinding medium.
5. The method of claim 1, wherein, In step (4.1), the low-grade gold-containing ore material is regrinded by using a regrinding machine with ceramic grinding medium.
6. The method of claim 1, wherein, In step (5.2), the flotation tailing A obtained in step (5.1) is classified by using a classification device; the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; the vibrating screen is a high-frequency vibrating fine screen; In step (5.3), the coarse-grained product obtained in step (5.2) is regrinded by using a regrinding machine with ceramic grinding medium.
7. The method of claim 1, wherein, In step (6.1), the low-grade gold-containing ore material is classified by using a classification device; the classification device is a hydrocyclone, a spiral classifier or a vibrating screen; the vibrating screen is a high-frequency vibrating fine screen; In step (6.2), the coarse-grained product obtained in step (6.1) is regrinded by using a regrinding machine with ceramic grinding medium.
8. The method of claim 1, wherein, The gold grade of the low-grade gold-containing ore material is ≤2 g / t; the copper-sulfur separation tailing is at least one of a gold-containing copper-sulfur separation tailing, a gold-containing lead-sulfur separation tailing and a gold-containing zinc-sulfur separation tailing.
9. The method according to any one of claims 1 to 8, characterized in that, The desorption agent is at least one of activated carbon, sodium sulfide, water and an oxidation-reduction agent; The beneficiation agent comprises at least one of an inhibitor, a collector and a frother.
10. The method of claim 9, wherein, The inhibitor is at least one of dextrin, hydrogen peroxide, sodium pyrosulfite, KDY-2, Jinchan, YZ-1, BK506, KDY, calcium hypochlorite and lime; the addition amount of the inhibitor is 0.2 kg / t-6 kg / t; The collector is at least one of xanthate and its derivatives; the addition amount of the collector is 50 g / t-200 g / t; The frother is methyl isobutyl carbinol; the addition amount of the frother is 10 g / t-100 g / t.