Collecting agent for oxidized ore gold

Abstract

The invention provides an oxidized ore gold collecting agent which comprises the following components in parts by weight: 40 to 200 parts of aliphatic amine, 20 to 40 parts of aliphatic sulfate, 8 to 12 parts of methyl isobutyl carbinol, 3 to 6 parts of 2-mercaptobenzimidazole, 2 to 7 parts of ammonium citrate and 1 to 3 parts of 2-hydroxy-3-naphthalene mehydroxamic acid. The collecting agent can obtain a more stable adsorption layer and higher adsorption layer density, the adsorption capacity of the collecting agent on a bubble / flotation liquid phase interface is increased, and the yield reaches 80% or above.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and specifically relates to a collector for oxidized gold ore and a preparation method and application thereof. Background Art

[0002] Various flotation agents are used in mineral processing, among which collectors are used to improve the hydrophobicity and floatability of minerals. Collectors include sulfhydryl collectors, oxygen-containing acid collectors, amine collectors, etc. Such collectors will form floccules at high concentrations. Foreign open-pit quartz vein gold mines are open-pit deposits with severe weathering, large mud content, and very fine gold particle size. Generally, the re-selection effect is not ideal, and the yield is less than 15%. If physical flotation is used, the yield is at most about 60%.

[0003] Patent CN113304887A discloses an aminoxanthate ester sulfide ore collector and its preparation method and application, and specifically records that the aminoxanthate ester sulfide ore collector is used for the flotation of sulfide ores such as chalcopyrite, galena, sphalerite, molybdenite, and gold, silver, and other precious metals. In addition, the Chinese patent document with publication number CN109647628A discloses the use of a sulfur-substituted 1,3,4-thiadiazole compound as a flotation collector for lead-zinc sulfide ores, specifically for suppressing the associated iron sulfide ore therein, and flotating to obtain galena and sphalerite. Summary of the invention

[0004] The invention aims to provide a collector for oxidized gold ore. The gold chelate collector is prepared by taking aliphatic amine, aliphatic sulfate, methyl isobutyl carbinol, 2-mercaptobenzimidazole, ammonium citrate and 2-hydroxy-3-naphthohydroxamic acid as main components. Under the action of the gold chelate collector, the flotation index yield is significantly improved.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A collector for oxidized gold ore comprises the following components in parts by weight: 40-200 parts of aliphatic amine, 20-40 parts of aliphatic sulfate, 8-12 parts of methyl isobutyl carbinol, 3-6 parts of 2-mercaptobenzimidazole, 2-7 parts of ammonium citrate and 1-3 parts of 2-hydroxy-3-naphthohydroxamic acid.

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

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

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

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

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

[0012] S1: Take 40-200 parts of fatty amine and 20-40 parts of fatty sulfate, stir and react at a temperature of 35-55°C for 30-50 minutes to obtain a mixed solution A;

[0013] S2: Add 8-12 parts of methyl isobutyl carbinol to the mixed solution A obtained in step S1, and stir the mixture at 45-65° C. for 20-30 minutes to obtain a mixed solution B;

[0014] S3: sequentially add 3-6 parts of 2-mercaptobenzimidazole, 2-7 parts of ammonium citrate and 1-3 parts of 2-hydroxy-3-naphthohydroxamic acid to step S2, and stir the reaction at a temperature of 65-75° C. 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 fatty sulfate, stir and react at a temperature of 50°C and a rate of 600r / min for 45min to obtain a mixed solution A; S2: add 10 parts of methyl isobutyl carbinol to the mixed solution A obtained in step S1, stir and react at a temperature of 50°C and a rate of 500r / min for 25min to obtain a mixed solution B; S3: add 4 parts of 2-mercaptobenzimidazole, 5 parts of ammonium citrate and 2 parts of 2-hydroxy-3-naphthohydroxamic acid to step S2 in sequence, stir and react at a temperature of 72°C and a rate of 600r / min for 2.5h to obtain the collector.

[0016] The application of the above-mentioned oxidized gold collector in mineral processing comprises the following steps: S1: grinding the raw stone to obtain pulp A; S2: flotation of the pulp obtained in S1 to obtain flotation ore and flotation tailings; S3: grinding the flotation ore obtained in S2 to obtain pulp B; S4: flotation of the pulp B obtained in S3 again to obtain flotation concentrate and flotation middlings.

[0017] Preferably, in step S2, 300 parts of soda ash, 500 parts of water glass, 240 parts of collector and 60 parts of black medicine are added in the flotation, and the rough selection is carried out for 3 minutes.

[0018] Preferably, in step S4, 100 parts of collector and 40 parts of black medicine are added to the flotation, 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:

[0020] The invention is based on aliphatic amine and aliphatic sulfate. The aliphatic amine as the cation part and the aliphatic sulfate as the anion part are neutralized by the anion and cation electrical properties, so that the electrostatic repulsion between the collector molecules and the critical micelle concentration of the collector are reduced, thereby improving the flotation collection effect of the collector on the mineral. Under the synergistic effect of methyl isobutyl carbinol, 2-mercaptobenzimidazole ammonium citrate and 2-hydroxy-3-naphthohydroxamic acid, the collector can obtain a more stable adsorption layer and a higher adsorption layer density, increase the adsorption amount of the collector at the bubble / flotation liquid phase interface, enrich gold from 1.8 grams per ton of the original ore to 15 grams per ton, reduce the tailings to 0.2 grams per ton, and achieve a significant yield of more than 80%. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 are mixed at a mass ratio of 1:1.5 at room temperature and stirred at a rate of 350 r / min for 15 min to obtain aliphatic amine; sodium dodecyl sulfate and potassium octadecyl sulfate are mixed at a mass ratio of 1:1.2 at room temperature and stirred at a rate of 350 r / min for 10 min to obtain aliphatic sulfate;

[0025] Take 40g of fatty amine and 20g of fatty sulfate, stir and react at 35°C at a rate of 600r / min for 30min to obtain mixed solution A;

[0026] S2: Add 8 g of methyl isobutyl carbinol to the mixed solution A obtained in step S1, and stir the mixture at a temperature of 45° C. and a speed of 500 r / min for 20 min to obtain a mixed solution B;

[0027] S3: Add 3 g of 2-mercaptobenzimidazole, 2 g of ammonium citrate and 1 g of 2-hydroxy-3-naphthohydroxamic acid to step S2 in sequence, stir and react at a temperature of 65° C. and a speed of 600 r / min for 1 h to obtain the collector.

[0028] Example 2

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

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

[0031] Take 200g of fatty amine and 40g of fatty sulfate, stir and react at 55°C and 600r / min for 50min to obtain mixed solution A;

[0032] S2: Add 12 g of methyl isobutyl carbinol to the mixed solution A obtained in step S1, and stir the mixture at 65° C. and 500 r / min for 30 min to obtain a mixed solution B;

[0033] S3: 6 g of 2-mercaptobenzimidazole, 7 g of ammonium citrate and 3 g of 2-hydroxy-3-naphthohydroxamic acid were added to step S2 in sequence, and the mixture was stirred at a temperature of 75° C. and a speed of 600 r / min for 3 h to obtain the collector.

[0034] Example 3

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

[0036] S1: A mixture of hexadecylamine and eicosylamine in a mass ratio of 1:2.5 is mixed at room temperature and stirred at a rate of 350 r / min for 20 min to obtain a fatty amine; sodium dodecyl sulfate and potassium octadecyl sulfate in a mass ratio of 1:1.5 are mixed at room temperature and stirred at a rate of 350 r / min for 15 min to obtain aliphatic sulfate;

[0037] Take 150g of fatty amine and 35g of fatty sulfate, stir and react at 50°C at a rate of 600r / min for 45min to obtain a mixed solution A;

[0038] S2: Add 10 g of methyl isobutyl carbinol to the mixed solution A obtained in step S1, and stir the mixture at a temperature of 50° C. and a speed of 500 r / min for 25 min to obtain a mixed solution B;

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

[0040] Comparative Example 1

[0041] No collector is added and conventional reagents are used.

[0042] Comparative Example 2

[0043] The difference between this comparative example and Example 1 is that step S2 is missing, that is, methyl isobutyl carbinol is not added, and 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, and 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, and 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-naphthohydroxamic acid is missing in step S3, and the other steps are the same.

[0050] Performance Test:

[0051] The collectors obtained in the examples and comparative examples are applied to gold ore dressing. Specifically:

[0052] S1: Grind the raw stone, control the grinding fineness to -200 mesh 75%, and obtain pulp A;

[0053] S2: flotation of the first pulp obtained in S1, adding 300g soda ash, 500g water glass, 240g collector, 60g black medicine, roughing for 3min, to obtain flotation ore and flotation tailings;

[0054] S3: Grinding the flotation ore obtained in S2 to obtain pulp B;

[0055] S4: The pulp B obtained in S3 is floated again, 100g of collector and 40g of black medicine are added, and the flotation concentrate and flotation middling are obtained by scavenging for 4min.

[0056] Example 1 Flotation Index Yield Table

[0057]

[0058] Example 2 Flotation Index Yield Table

[0059]

[0060]

[0061] Example 3 Flotation Index Yield Table

[0062]

[0063] Example 4 Flotation Index Yield Table

[0064]

[0065] Example 5 Flotation Index Yield Table

[0066]

[0067] Comparative Example 1 Flotation Index Yield Table

[0068]

[0069]

[0070] Comparative Example 2 Flotation Index Yield Table

[0071]

[0072] Comparative Example 3 Flotation Index Yield Table

[0073]

[0074] Comparative Example 4 Flotation Index Yield Table

[0075]

[0076]

[0077] Comparative Example 5 Flotation Index Yield Table

[0078]

[0079] From the above performance test results, it can be seen that the recovery rates of Examples 1-5 are good. However, because the necessary technical solutions are not adopted in Comparative Examples 1-5, especially in Comparative Example 1, no collector is added and conventional reagents are used, the corresponding performance tests are obviously worse than those of the embodiments. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0080] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A collector for oxidized gold ore, characterized in that: The invention comprises the following components in parts by weight: 40-200 parts of aliphatic amine, 20-40 parts of aliphatic sulfate, 8-12 parts of methyl isobutyl carbinol, 3-6 parts of 2-mercaptobenzimidazole, 2-7 parts of ammonium citrate and 1-3 parts of 2-hydroxy-3-naphthohydroxamic acid.

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

5.

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

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

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

6.

6. A method for preparing a collector for oxidized gold ore, characterized in that: The steps include: S1: Take 40-200 parts of fatty amine and 20-40 parts of fatty sulfate, stir and react at a temperature of 35-55°C for 30-50 minutes to obtain a mixed solution A; S2: Add 8-12 parts of methyl isobutyl carbinol to the mixed solution A obtained in step S1, and stir the mixture at 45-65° C. for 20-30 minutes to obtain a mixed solution B; S3: sequentially add 3-6 parts of 2-mercaptobenzimidazole, 2-7 parts of ammonium citrate and 1-3 parts of 2-hydroxy-3-naphthohydroxamic acid to step S2, and stir the reaction at a temperature of 65-75° C. 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 optimization is as follows: S1: 150 parts of fatty amine and 35 parts of fatty sulfate are taken, stirred at 50°C and 600r / min for 45min to obtain a mixed solution A; S2: add 10 parts of methyl isobutyl carbinol to the mixed solution A obtained in step S1, stir and react at a temperature of 50°C and a rate of 500r / min for 25min to obtain a mixed solution B; S3: add 4 parts of 2-mercaptobenzimidazole, 5 parts of ammonium citrate and 2 parts of 2-hydroxy-3-naphthohydroxamic acid to step S2 in sequence, stir and react at a temperature of 72°C and a rate of 600r / min for 2.5h to obtain the collector.

8. An application of an oxidized gold collector in mineral processing, characterized in that: The method comprises the following steps: S1: grinding the raw stone to obtain pulp A; S2: flotation the pulp obtained in S1 to obtain flotation ore and flotation tailings; S3: grinding the flotation ore obtained in S2 to obtain pulp B; S4: flotation the pulp B obtained in S3 again to obtain flotation concentrate and flotation tailings.

9. The use of an oxidized gold collector in mineral processing according to claim 8, 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 were added into the flotation, and the rough selection was carried out for 3 minutes.

10. The use of an oxidized gold collector in mineral processing according to claim 8, characterized in that: In step S4, 100 parts of collector and 40 parts of black medicine were added to the flotation, and the flotation was performed for 4 minutes.

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