A collector for oxidized ores of gold

Abstract

This invention provides a collector for oxidizing gold ores, comprising, by weight, the following components: 40-200 parts aliphatic amine, 20-40 parts aliphatic sulfate, 8-12 parts methyl isobutyl methanol, 3-6 parts 2-mercaptobenzimidazole, 2-7 parts ammonium citrate, and 1-3 parts 2-hydroxy-3-naphthylhydroxamic acid; it enables the collector to obtain a more stable adsorption layer and a higher adsorption layer density, increases the adsorption amount of the collector at the bubble / flotation liquid interface, and achieves a yield of over 80%.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically relating to a collector for oxidized gold ore, its preparation method, and its application. Background Technology

[0002] Various flotation reagents are used in mineral processing. Collectors are agents used to improve the hydrophobicity and floatability of minerals. Collectors include sulfhydryl collectors, oxyacid collectors, and amine collectors. At high concentrations, these collectors can form flocs. In overseas open-pit quartz vein gold mines, due to the open-pit nature of the deposits, severe weathering, high mud content, and extremely fine gold grain size, gravity separation is generally ineffective, with a yield of less than 15%. Even using physical flotation, the yield is at most around 60%.

[0003] Patent CN113304887A discloses an aminoxanthate sulfide ore collector, its preparation method, and its application. Specifically, it describes the use of the aminoxanthate sulfide ore collector for the flotation of chalcopyrite, galena, sphalerite, molybdenite, and sulfide ores containing gold and silver. Furthermore, Chinese patent document CN109647628A discloses the application of a sulfur-substituted 1,3,4-thiadiazole compound as a flotation collector for lead-zinc sulfide ores, specifically used to suppress associated iron sulfide ores, yielding galena and sphalerite through flotation. Summary of the Invention

[0004] The purpose of this invention is to provide a collector for oxidized gold ore. The gold chelating collector is prepared by using aliphatic amines, aliphatic sulfates, methyl isobutyl methanol, 2-mercaptobenzimidazole, ammonium citrate and 2-hydroxy-3-naphthylhydroxamic acid as the main components. Under the action of the gold chelating collector, the flotation yield is significantly improved.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A collector for oxidizing gold ore, comprising, by weight, the following components: 40-200 parts aliphatic amine, 20-40 parts aliphatic sulfate, 8-12 parts methyl isobutyl methanol, 3-6 parts 2-mercaptobenzimidazole, 2-7 parts ammonium citrate, and 1-3 parts 2-hydroxy-3-naphthylhydroxamic acid.

[0007] Preferably, the fatty amine is a mixture of dodecylamine and octadecylamine in a mass ratio of 1:1.5-2.5.

[0008] Preferably, the fatty amine is a mixture of hexadecylamine and eicosamine in a mass ratio of 1:2-3.

[0009] Preferably, the aliphatic sulfate is one or a mixture of sodium dodecyl sulfate or potassium octadecyl sulfate.

[0010] Preferably, the aliphatic sulfate is a mixture of sodium dodecyl sulfate and potassium octadecyl sulfate in a mass ratio of 1:1.2-1.6.

[0011] The preparation method of the above-mentioned collector for oxidized gold ore includes the following steps:

[0012] S1: Take 40-200 parts of fatty amine and 20-40 parts of aliphatic sulfate, stir and react at 35-55℃ for 30-50 min to obtain mixture A;

[0013] S2: Add 8-12 parts of methyl isobutyl methanol to the mixture A obtained in step S1, and stir the mixture at 45-65℃ for 20-30 min to obtain mixture B;

[0014] S3: Add 3-6 parts of 2-mercaptobenzimidazole, 2-7 parts of ammonium citrate and 1-3 parts of 2-hydroxy-3-naphthylhydroxamic acid to step S2 in sequence, and stir the reaction at 65-75℃ for 1-3 hours to obtain the collector.

[0015] Preferably, the specific optimization is as follows: S1: Take 150 parts of fatty amine and 35 parts of aliphatic sulfate, and stir at 50°C and 600 r / min for 45 min to obtain mixture A; S2: Add 10 parts of methyl isobutyl methanol to mixture A obtained in step S1, and stir at 50°C and 500 r / min for 25 min to obtain mixture B; S3: Add 4 parts of 2-mercaptobenzimidazole, 5 parts of ammonium citrate and 2 parts of 2-hydroxy-3-naphthylhydroxamic acid to step S2 in sequence, and stir at 72°C and 600 r / min for 2.5 h to obtain the collector.

[0016] The application of the above-mentioned oxidized gold collector in mineral processing includes the following steps: S1: Grind the raw ore to obtain slurry A; S2: Perform flotation on the slurry obtained in S1 to obtain flotation raw ore and flotation tailings; S3: Grind the flotation raw ore obtained in S2 to obtain slurry B; S4: Perform flotation again on slurry B obtained in S3 to obtain flotation concentrate and flotation medium.

[0017] Preferably, in step S2, 300 parts of soda ash, 500 parts of water glass, 240 parts of collector, and 60 parts of black powder are added to the flotation process, and the roughing process lasts for 3 minutes.

[0018] Preferably, in step S4, 100 parts of collector and 40 parts of black powder are added to the flotation process, and the flotation is carried out for 4 minutes.

[0019] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0020] This invention, based on aliphatic amines and aliphatic sulfates, utilizes the cationic aliphatic amine and the anionic aliphatic sulfate to neutralize each other through electrostatic neutralization, thereby reducing the electrostatic repulsion between collector molecules and the critical micelle concentration of the collector, thus improving the flotation collection efficiency of the collector for minerals. Through the synergistic effect of methyl isobutyl methanol, 2-mercaptobenzimidazole, ammonium citrate, and 2-hydroxy-3-naphthylhydroxyxamic acid, the collector achieves a more stable adsorption layer and a higher adsorption layer density, increasing the adsorption capacity of the collector at the bubble / flotation liquid interface. This results in a significant improvement in gold concentration, increasing it from 1.8 g / t of the raw ore to 15 g / t, reducing tailings to 0.2 g / t, and achieving a recovery rate of over 80%. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] This embodiment provides a method for preparing a collector for oxidized gold ore, comprising the following steps:

[0024] S1: Dodecylamine and octadecylamine were mixed at room temperature and stirred at a rate of 350 r / min for 15 min at a mass ratio of 1:1.5 to obtain aliphatic amines; sodium dodecyl sulfate and potassium octadecyl sulfate were mixed at room temperature and stirred at a rate of 350 r / min for 10 min at a mass ratio of 1:1.2 to obtain aliphatic sulfates.

[0025] Take 40g of fatty amine and 20g of aliphatic sulfate, stir at 35℃ for 30min at a rate of 600r / min to obtain mixture A;

[0026] S2: Add 8g of methyl isobutyl methanol to the mixture A obtained in step S1, and stir at 500r / min at 45℃ for 20min to obtain mixture B;

[0027] S3: Add 3g of 2-mercaptobenzimidazole, 2g of ammonium citrate and 1g of 2-hydroxy-3-naphthylhydroxyxamic acid to step S2 in sequence, and stir the mixture at 600r / min for 1h at 65℃ to obtain the collector.

[0028] Example 2

[0029] This embodiment provides a method for preparing a collector for oxidizing gold ore, comprising the following steps:

[0030] S1: Dodecylamine and octadecylamine were mixed at room temperature at a mass ratio of 1:2.5 and stirred at a rate of 400 r / min for 25 min to obtain aliphatic amines; sodium dodecyl sulfate and potassium octadecyl sulfate were mixed at room temperature at a mass ratio of 1:1.6 and stirred at a rate of 300 r / min for 15 min to obtain aliphatic sulfates.

[0031] Take 200g of fatty amine and 40g of aliphatic sulfate, and stir the mixture at 55℃ and 600r / min for 50min to obtain mixture A;

[0032] S2: Add 12g of methyl isobutyl methanol to the mixture A obtained in step S1, and stir at 500r / min at 65℃ for 30min to obtain mixture B;

[0033] S3: Add 6g of 2-mercaptobenzimidazole, 7g of ammonium citrate and 3g of 2-hydroxy-3-naphthylhydroxyxamic acid to step S2 in sequence, and stir the mixture at 75°C and 600r / min for 3h to obtain the collector.

[0034] Example 3

[0035] This embodiment provides a method for preparing a collector for oxidizing gold ore, comprising the following steps:

[0036] S1: Mix hexadecylamine and eicosamine at a mass ratio of 1:2.5 at room temperature and stir at a rate of 350 r / min for 20 min to obtain aliphatic amine; mix sodium dodecyl sulfate and potassium octadecyl sulfate at a mass ratio of 1:1.5 at room temperature and stir at a rate of 350 r / min for 15 min to obtain aliphatic sulfate.

[0037] Take 150g of fatty amine and 35g of aliphatic sulfate, stir at 50℃ and 600r / min for 45min to obtain mixture A;

[0038] S2: Add 10g of methyl isobutyl methanol to the mixture A obtained in step S1, and stir at 500r / min for 25min at 50℃ to obtain mixture B;

[0039] S3: Add 4g of 2-mercaptobenzimidazole, 5g of ammonium citrate and 2g of 2-hydroxy-3-naphthylhydroxamic acid to step S2 in sequence, and stir the mixture at 72°C and 600r / min for 2.5h to obtain the collector.

[0040] Comparative Example 1

[0041] No collectors are added; conventional reagents are used.

[0042] Comparative Example 2

[0043] The difference between this comparative example and Example 1 is that step S2 is missing, i.e., methyl isobutyl methanol is not added; the other steps are the same.

[0044] Comparative Example 3

[0045] The difference between this comparative example and Example 1 is that 2-mercaptobenzimidazole is missing in step S3, while the other steps are the same.

[0046] Comparative Example 4

[0047] The difference between this comparative example and Example 1 is that ammonium citrate is missing in step S3, while the other steps are the same.

[0048] Comparative Example 5

[0049] The difference between this comparative example and Example 1 is that 2-hydroxy-3-naphthylhydroxamic acid is missing in step S3, while the other steps are the same.

[0050] Performance testing:

[0051] The collectors obtained in each embodiment and comparative example were applied to gold beneficiation. Specifically:

[0052] S1: Grind the raw stone to a fineness of -200 mesh (75%) to obtain slurry A; S2: Perform flotation on the slurry obtained in S1, adding 300g of soda ash and 500g of...

[0053] Water glass, 240g collector, and 60g black powder are roughed for 3 minutes to obtain flotation raw ore and flotation tailings; S3: The flotation raw ore obtained in S2 is ground to obtain slurry B; S4: Slurry B obtained in S3 is floated again, 100g collector and 40g black powder are added, and scavenging is carried out for 4 minutes to obtain flotation concentrate and flotation medium.

[0054] Example 1: Flotation Index Yield Table

[0055]

[0056] Example 2 Flotation Index Yield Table

[0057]

[0058] Example 3 Flotation Index Yield Table

[0059]

[0060] Example 4: Flotation Index Yield Table

[0061]

[0062] Example 5 Flotation Index Yield Table

[0063]

[0064] Comparative Example 1: Flotation Index Yield Table

[0065]

[0066] Comparative Example 2: Flotation Index Yield Table

[0067]

[0068] Comparative Example 3: Flotation Index Yield Table

[0069]

[0070] Comparative Example 4: Flotation Index Yield Table

[0071]

[0072] Comparative Example 5: Flotation Index Yield Table

[0073]

[0074] The performance test results above show that Examples 1-5 have better recovery rates. However, Comparative Examples 1-5, in particular, did not employ necessary technical solutions, with Comparative Example 1 using conventional reagents instead of a collector, resulting in significantly worse performance than the Examples. These experimental results further demonstrate the importance of the technical solutions defined in this invention for its technical effectiveness.

[0075] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A collector for oxidizing gold ore, characterized in that, By weight, it comprises the following components: 40-200 parts fatty amine, 20-40 parts aliphatic sulfate, 8-12 parts methyl isobutyl methanol, 3-6 parts 2-mercaptobenzimidazole, 2-7 parts ammonium citrate and 1-3 parts 2-hydroxy-3-naphthylhydroxamic acid.

2. The collector for oxidized gold ore according to claim 1, characterized in that, The fatty amine is a mixture of dodecylamine and octadecylamine in a mass ratio of 1:1.5-2.

5.

3. The collector for oxidized gold ore according to claim 1, characterized in that, The fatty amine is a mixture of hexadecylamine and eicosamine in a mass ratio of 1:2-3.

4. The collector for oxidized gold ore according to claim 1, characterized in that, The aliphatic sulfate is one or a mixture of sodium dodecyl sulfate or potassium octadecyl sulfate.

5. The collector for oxidized gold ore according to claim 4, characterized in that, The aliphatic sulfate is a mixture of sodium dodecyl sulfate and potassium octadecyl sulfate in a mass ratio of 1:1.2-1.

6.

6. The method for preparing a collector for oxidized gold ore as described in claim 1, characterized in that, Includes the following steps: S1: Take 40-200 parts of fatty amine and 20-40 parts of aliphatic sulfate, stir and react at 35-55℃ for 30-50 min to obtain mixture A; S2: Add 8-12 parts of methyl isobutyl methanol to the mixture A obtained in step S1, and stir the mixture at 45-65℃ for 20-30 min to obtain mixture B; S3: Add 3-6 parts of 2-mercaptobenzimidazole, 2-7 parts of ammonium citrate and 1-3 parts of 2-hydroxy-3-naphthylhydroxamic acid to step S2 in sequence, and stir the reaction at 65-75℃ for 1-3 hours to obtain the collector.

7. The method for preparing a collector for oxidized gold ore according to claim 6, characterized in that, The specific steps are as follows: S1: Take 150 parts of fatty amine and 35 parts of aliphatic sulfate, stir and react at 50℃ and 600r / min for 45min to obtain mixed solution A; S2: Add 10 parts of methyl isobutyl methanol to the mixture A obtained in step S1, and stir at 500 r / min for 25 min at 50°C to obtain mixture B; S3: Add 4 parts of 2-mercaptobenzimidazole, 5 parts of ammonium citrate and 2 parts of 2-hydroxy-3-naphthylhydroxamic acid to step S2 in sequence, and stir at 600 r / min for 2.5 h at 72°C to obtain the collector.

8. The application of the oxide gold collector as described in claim 1 in mineral processing, characterized in that, The process includes the following steps: S1: Grind the raw ore to obtain slurry A; S2: Perform flotation on the slurry obtained in S1 to obtain flotation raw ore and flotation tailings; S3: Grind the flotation raw ore obtained in S2 to obtain slurry B; S4: Perform flotation again on slurry B obtained in S3 to obtain flotation concentrate and flotation medium.

9. The application of the oxide gold collector according to claim 8 in mineral processing, characterized in that, In step S2, 300 parts of soda ash, 500 parts of water glass, 240 parts of collector, and 60 parts of black powder are added to the flotation process, and the roughing process is carried out for 3 minutes.

10. The application of the oxide gold collector according to claim 8 in mineral processing, characterized in that, In step S4, 100 parts of collector and 40 parts of black powder are added to the flotation process, and the flotation is carried out for 4 minutes.

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