Flotation collector for refractory gold ore and its preparation method and application

Abstract

The present invention provides a flotation collector for refractory gold ore and its preparation method and application. The flotation collector includes 25 to 30 parts of N-phenyl-2-mercaptobenzimidazole, 15 to 20 parts of phenol black medicine, 7.5 to 9 parts of surfactant, 3 to 4 parts of emulsifier, 1 to 2 parts of alkali, 1 to 2 parts of defoamer, 2 to 3 parts of foaming agent and 70 to 80 parts of water by weight. The preparation method of preparing solution I and solution II separately and then fully mixing the two solutions can effectively play the synergistic effect between the reagents to obtain a collector with stable foam, strong collection effect and selectivity. When the flotation collector of the present invention is applied to gold ore flotation, it effectively improves the recovery rate and grade of fine-grained and micro-particle gold ore dressing, especially the roughing pre-enrichment of low-grade, easy-floating and easy-mud gold ore and the adjustment and optimization effect of flotation environment are remarkable; it also has the characteristics of small dosage of reagents, remarkable flotation effect, safety and environmental protection, and high market promotion value.

Description

Technical Field

[0001] The present invention relates to the technical field of gold ore flotation, and in particular to a flotation collector for refractory gold ore and a preparation method and application thereof. Background Art

[0002] In the gold ore flotation industry, thio compounds are mostly used as collectors, such as butyl xanthate, isopentyl xanthate and butyl ammonium black medicine, etc. This type of gold collector has good flotation indicators for gold ores with single properties, but with the prominent characteristics of "poor, fine and mixed" gold ores in recent years, the gold ore grade has been declining year by year, the ore properties have become more complex, the embedded particle size is fine, and the content of impurities such as carbonaceous matter and arsenic is high. This has caused problems such as poor selectivity and weak collection ability during the action of gold ore flotation collectors, which in turn affects the sorting indicators and reduces the economic benefits of enterprises.

[0003] In order to adapt to the complexity and difficulty of existing gold ores, improve the flotation indicators of gold mines, and take into account the economic benefits and environmental protection issues of production units, many researchers in the industry are committed to the development of new flotation agents based on the theory of flotation agent compounding and assembly. For example, the invention patent (application number 202110771617.3) discloses a composite collector for gold mines and its application, which includes main collectors such as xanthate, black medicine and fatty acid salts, and auxiliary collectors such as diethylhexanoate, RA935 and sodium linoleate; the synergistic effect between the collectors is utilized to improve the collection effect of gold minerals and gold-containing oxides in quartz vein-altered rock type gold mines; however, the composition of the composite collector is complex, and the chemical waste liquid generated is difficult to treat, and the composite collector still has certain limitations for the flotation of low-grade, easy-to-float and easy-to-mud gold ores with a large stock at present. For example, a larger amount of reagent will enhance the collection ability of gold minerals and easy-to-float gangue, deteriorate the flotation environment, and make it difficult for the reagent to show selectivity. At the same time, its rough gold enrichment is relatively low, which may lead to an increase in the circulation amount of intermediate ore in the closed-circuit production process, making it difficult to guarantee the grade of the final product.

[0004] In addition, although new collectors developed in the prior art, such as the Y-89 series, MA xanthate and MB xanthate series of high-efficiency gold-selecting collectors, have achieved certain application research results and improved the collection performance overall, the selectivity of the reagents has been reduced, and the recovery effect of fine-grained and micro-particle gold still needs to be improved; and when the above-mentioned collectors are used, they are affected by their limited recovery effect on difficult-to-select fine-grained and micro-particle gold, and the process still needs to be carried out for multiple roughing, concentrating and scavenging processes to improve the overall recovery rate and grade of the gold mine, resulting in a long process flow and low flotation efficiency.

[0005] In view of this, it is necessary to design an improved flotation collector for refractory gold ore and its preparation method and application to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a flotation collector for refractory gold ore and a preparation method and application thereof. The flotation collector for refractory gold ore is prepared by limiting the composition of the flotation collector and adopting a specific preparation method. The flotation collector can effectively overcome the problems of poor selectivity and weak collection ability of conventional yellow medicine and black medicine gold collectors for fine-grained gold, micro-particle gold or "carbon robbery gold". At the same time, by regulating the foaming layer, the recovery rate and grade of fine-grained and micro-particle gold ore dressing can be effectively improved, especially the roughing pre-enrichment and flotation environment adjustment optimization effect of low-grade, easy-floating and easy-mudification gold ore is remarkable. The flotation collector has the characteristics of small dosage of reagents, safety and environmental protection, wide source of raw materials and simple preparation process.

[0007] To achieve the above-mentioned purpose, the present invention provides a flotation collector for refractory gold ore, which comprises, by weight: 25 to 30 parts of N-phenyl-2-mercaptobenzimidazole, 15 to 20 parts of phenol black medicine, 7.5 to 9 parts of surfactant, 3 to 4 parts of emulsifier, 1 to 2 parts of alkali, 1 to 2 parts of defoamer, 2 to 3 parts of foaming agent, and 70 to 80 parts of water.

[0008] As a further improvement of the present invention, the defoaming agent is tributyl phosphate, the foaming agent is pine oil; the phenol black medicine includes one or more of No. 15 black medicine, No. 25 black medicine, and No. 31 black medicine.

[0009] As a further improvement of the present invention, the emulsifier includes one or more of polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 80.

[0010] As a further improvement of the present invention, the surfactant includes one or more of sodium lauryl ether sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, and isooctyl alcohol phosphate.

[0011] As a further improvement of the present invention, the alkali includes one or more of sodium bicarbonate, sodium hydroxide, and potassium hydroxide.

[0012] The present invention also provides a method for preparing a flotation collector for refractory gold ore, comprising the following steps:

[0013] S1. After mixing the alkali and water, stirring at 25-35° C., N-phenyl-2-mercaptobenzimidazole and a surfactant are sequentially added to obtain a mixture, and stirring is continued to obtain a solution I;

[0014] S2, dissolving the emulsion in water, adding 0.3 to 0.5 times the total weight of phenol black medicine while stirring at 30 to 35°C, stirring for 15 to 20 minutes, then adding the remaining phenol black medicine, tributyl phosphate and pine oil, and continuing to stir for 1.5 to 2 hours to obtain a milky white solution II;

[0015] S3. Mix the solution I prepared in step S1 and the solution II prepared in step S2 at 25° C. and stir for 1.5 to 2 hours to obtain a flotation collector for refractory gold ore.

[0016] As a further improvement of the present invention, in terms of parts by weight, in step S1, the parts by weight of water is 40 to 45 parts, and in step S2, the parts by weight of water is 30 to 40 parts.

[0017] As a further improvement of the present invention, in step S2, the stirring is a strong stirring process, and the rotation speed is 600-800 r / min.

[0018] As a further improvement of the present invention, in step S1, the stirring time at 25-35° C. is 10-15 min, and the stirring time of the mixture is 1.5-2 h.

[0019] The present invention also provides an application of a flotation collector for refractory gold ore. The flotation collector is applied to a roughing process of a gold ore flotation process. The added amount of the flotation collector is 100-200 g / t.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention provides a flotation collector for refractory gold ore and its preparation method and application. The flotation collector is composed of N-phenyl-2-mercaptobenzimidazole, phenol black medicine, surfactant, emulsifier, alkali, defoamer, foaming agent and water. The flotation collector for refractory gold ore is prepared by limiting the composition and content of the flotation collector and adopting a specific preparation method. The gold ore flotation collector effectively overcomes the problems of poor selectivity and weak capture ability of conventional yellow medicine and black medicine gold collectors for fine-grained gold, micro-particle gold or "carbon robbery gold". At the same time, by regulating the foaming layer, the recovery rate and grade of fine-grained-micro-particle gold ore dressing are effectively improved, especially for the roughing pre-enrichment of low-grade, easy-floating and easy-mudification gold ore and the adjustment and optimization effect of flotation environment. It has the characteristics of small dosage of reagents, safety and environmental protection, wide source of raw materials, simple preparation process, and low environmental pollution, and also has good market promotion value.

[0022] 2. In the preparation method of the flotation collector for the refractory gold ore of the present invention, solution I and solution II are prepared respectively. The surfactant in solution I can effectively reduce the surface tension and surface free energy of N-phenyl-2-mercaptobenzimidazole in water and enhance the surface activity of the agent. The emulsifier in solution II effectively reduces the interfacial tension of phenol black drug. First, an O / W type emulsion is formed under strong stirring. After continuing to add phenol black drug, tributyl phosphate and pine oil, the surface tension of the agent is further reduced. The oil substance is quickly dispersed in the water medium in the form of small droplets through emulsification. After a period of time, a W / O type emulsion is formed. The surface of the droplets forms a double electric layer due to the adsorbed excess charge, which improves the stability of the mixed system. The flotation collector prepared by fully mixing the two solutions can effectively play the synergistic effect between the agents, enhance the collision probability of the collector and the target mineral and the surface adsorption effect.

[0023] 3. The present invention can significantly adjust the flotation foam state during the flotation of gold ore that is easy to float and easy to muddy and has high sensitivity to ore mud by mixing tributyl phosphate and pine oil in proportion into the O / W type emulsion, and effectively ensure the stability, richness and selectivity of the flotation foam; the prepared gold flotation collector should show higher selectivity and stronger collection ability for gold minerals, the flotation foam is stable and solid, the floating rate of fine-grained gold minerals is accelerated, and excellent flotation indicators are achieved, especially when the Au grade of the original ore is low, the flotation collector shows good ore adaptability.

[0024] 4. The flotation collector for refractory gold ores of the present invention can be prepared at room temperature and pressure, has a simple process and good solubility, overcomes the shortcomings of conventional xanthate-based gold ore flotation collectors such as strong irritating odor, large amount of agent dust, and difficulty in configuration and addition, and has the advantages of small agent dosage and significant flotation effect.

[0025] 5. The flotation collector of the present invention is mainly used in the flotation operation of gold ores with low raw ore grade, easy to float and easy to mud. The selectivity for gold is enhanced by modifying the flotation reagent and strengthening the control of the mineralized foam layer. On the premise of retaining the strong collecting ability of the reagent, the roughing enrichment ratio is significantly improved, the circulation of easy-to-float gangue in the concentration section is reduced, and the dosage of the reagent is reduced. In addition, the relevant reagents in the scheme are low-priced, widely available, and green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic diagram of the application process of the flotation collector for refractory gold ore of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0029] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0030] A flotation collector for refractory gold ore comprises, by weight, 25 to 30 parts of N-phenyl-2-mercaptobenzimidazole, 15 to 20 parts of phenol black medicine, 7.5 to 9 parts of surfactant, 3 to 4 parts of emulsifier, 1 to 2 parts of alkali, 1 to 2 parts of defoamer, 2 to 3 parts of foaming agent, and 70 to 80 parts of water. The flotation collector for refractory gold ore effectively overcomes the problems of poor selectivity and weak collection ability of conventional xanthate and black medicine gold collectors for fine-grained gold, micro-particle gold or "carbon robbery gold", and at the same time, by regulating the foaming layer, effectively improves the recovery rate and grade of fine-grained-micro-particle gold ore dressing, especially for the roughing pre-enrichment of low-grade, easy-floating and easy-mudification gold ore and the adjustment and optimization effect of flotation environment, and has the characteristics of small dosage of reagents, safety and environmental protection, wide source of raw materials, simple preparation process, and low environmental pollution, and also has good market promotion value.

[0031] Specifically, the defoamer is tributyl phosphate, the foaming agent is pine oil; the phenol black medicine includes one or more of No. 15 black medicine, No. 25 black medicine, and No. 31 black medicine. The emulsifier includes one or more of polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 80. The surfactant includes one or more of sodium lauryl ether sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, and isooctyl alcohol phosphate. The alkali includes one or more of sodium bicarbonate, sodium hydroxide, and potassium hydroxide.

[0032] In particular, the addition of tributyl phosphate and pine oil can significantly adjust the flotation foam state during the flotation of gold ores that are easy to float, easy to muddy, and highly sensitive to slime, thereby effectively ensuring the stability, richness and selectivity of the flotation foam; the prepared gold flotation collector should show higher selectivity and stronger collection ability for gold minerals, the flotation foam is stable and solid, the flotation rate of fine-grained gold minerals is accelerated, and excellent flotation indicators are achieved, especially when the Au grade of the original ore is low, the flotation collector shows good ore adaptability.

[0033] A method for preparing a flotation collector for refractory gold ore comprises the following steps:

[0034] S1. After mixing the alkali and water, stirring at 25-35° C., N-phenyl-2-mercaptobenzimidazole and a surfactant are sequentially added to obtain a mixture, and stirring is continued to obtain a solution I;

[0035] S2, dissolving the emulsion in water, adding 0.3 to 0.5 times the total weight of phenol black medicine while stirring at 30 to 35°C, stirring for 15 to 20 minutes, then adding the remaining phenol black medicine, tributyl phosphate and pine oil, and continuing to stir for 1.5 to 2 hours to obtain a milky white solution II;

[0036] S3. Mix the solution I prepared in step S1 and the solution II prepared in step S2 at 25° C. and stir for 1.5 to 2 hours to obtain a flotation collector for refractory gold ore.

[0037] Specifically, in step S1, the weight portion of water is 40 to 45 parts; the stirring time at 25 to 35° C. is 10 to 15 minutes, and the stirring time of the mixture is 1.5 to 2 hours. The surfactant in solution I can effectively reduce the surface tension and surface free energy of N-phenyl-2-mercaptobenzimidazole in water and enhance the surface activity of the agent.

[0038] In step S2, the weight of water is 30 to 40 parts, and the stirring is a strong stirring process, and the rotation speed is 600 to 800 r / min. The emulsifier in solution II can effectively reduce the interfacial tension of phenol black medicine, and first forms an O / W type emulsion (water-in-oil type emulsion) under strong stirring. After continuing to add phenol black medicine, tributyl phosphate and pine oil, the surface tension of the agent is further reduced, and the oil substance is quickly dispersed in the water medium in the form of small droplets through emulsification. After a period of time, a W / O type emulsion (oil-in-water type emulsion) is formed. The surface of the droplet forms a double electric layer due to the adsorbed excess charge, which improves the stability of the drug system.

[0039] In the preparation method, solution I and solution II are prepared separately, with the purpose of making the prepared reagent surface more active, avoiding the conflict of reagents during the preparation process, and making the reagent system more stable; the flotation collector prepared after fully mixing the two solutions can effectively exert the synergistic effect between the reagents, enhance the collision probability between the collector and the target mineral and the surface adsorption effect, and obtain a gold mine collector with strong collection effect and selectivity.

[0040] The present invention also provides an application of a flotation collector for refractory gold ore, the flotation collector is applied to the roughing process of the gold ore flotation process, the addition amount of the flotation collector is 100-200g / t, and the addition amount is specifically 100-200g of the flotation collector can be added to 1 ton of dry ore. The collector has good foaming ability and high selectivity and strong collection ability for gold minerals. It is applied to the field of gold ore flotation, effectively solving the problem of low flotation recovery rate of refractory gold ore with low Au grade, complex ore properties and high carbonaceous content.

[0041] It should be noted that in the actual gold ore flotation process, not only is it necessary to add the flotation collector of the present invention, but it is also necessary to flot the gold ore with other types of reagents according to the type of ore or the requirements for the product to obtain a product that meets the requirements.

[0042] Example 1

[0043] Example 1 provides a method for preparing a flotation collector for refractory gold ore and the application of the flotation collector; the preparation method specifically comprises the following steps:

[0044] S1. Mix 2 parts of sodium hydroxide with 40 parts of water, stir at 25°C for 15 minutes, then add 25 parts of N-phenyl-2-mercaptobenzimidazole and 4 parts of sodium lauryl ether sulfate in sequence to obtain a mixture, and continue stirring for 1.5 hours to obtain solution I;

[0045] S2. Dissolve 3 parts of polysorbate 80 in 35 parts of water at 35°C and start strong stirring at a speed of 800 r / min. Add 5 parts of No. 25 black medicine while stirring. After stirring for 15 minutes, add 10 parts of No. 25 black medicine, 2 parts of tributyl phosphate and 2 parts of pine oil. Continue stirring for 1.5 hours to obtain a milky white solution II.

[0046] S3. Mix solution I prepared in step S1 and solution II prepared in step S2 at 25° C. and stir for 2 hours to obtain a flotation collector for refractory gold ore.

[0047] See also Figure 1 As shown in the figure, the flotation collector of the refractory gold ore is applied to the roughing process of the gold ore flotation process, and the addition amount of the flotation collector is 100g / t. The raw ore is a high-carbon quartz vein-type gold ore in Yunnan with a grade of 1.88g / t. The specific process flow is as follows Figure 1 shown.

[0048] Comparative Example 1

[0049] Comparative Example 1 is to flotation the same grade high-carbon quartz vein-type gold ore in Example 1, using butyl xanthate as a gold collector during roughing, and the process flow is the same as that of Example 1.

[0050] Comparative Example 2

[0051] Comparative Example 2 provides a method for preparing a flotation collector for refractory gold ore and an application of the flotation collector. Compared with Example 1, the difference is that the solution is not prepared in steps, and all raw materials are directly mixed at 25°C to prepare the flotation collector. The rest is roughly the same as Example 1 and will not be repeated here.

[0052] Comparative Example 3

[0053] Comparative Example 3 provides a method for preparing a flotation collector for refractory gold ore and the application of the flotation collector. Compared with Example 1, the difference is that in step S2, 2 parts of tributyl phosphate are not added, and the rest is roughly the same as Example 1, which will not be repeated here.

[0054] After the collectors in Example 1 and Comparative Examples 1 to 3 were applied to gold ore flotation, the Au rough concentrate yield, grade and Au recovery rate were tested, and the results are shown in the following table.

[0055] Table 1 Index test results of Example 1 and Comparative Examples 1 to 3

[0056] name Au rough concentrate yield / % Au grade (g / t) Au recovery rate / % Example 1 8.12 19.81 89.29 Comparative Example 1 9.78 15.36 86.62 Comparative Example 2 9.45 16.51 87.57 Comparative Example 3 10.34 14.97 88.78

[0057] As can be seen from Table 1, the Au rough concentrate grade and Au recovery rate of Example 1 are the highest. Compared with Comparative Example 1, the Au rough concentrate grade is >19 g / t, and the Au recovery rate is increased by about 3%; compared with Comparative Example 2, the Au rough concentrate yield is lower, and the Au grade and Au recovery rate are higher, indicating that the gold collector obtained by the preparation method of Example 1 of the present invention should show higher selectivity and stronger collection ability for gold minerals; combined with Comparative Example 3, the tributyl phosphate used in the present invention can make the flotation foam stable and solid, and accelerate the flotation rate of fine-grained gold minerals.

[0058] Example 2

[0059] Example 2 provides a method for preparing a flotation collector for refractory gold ore and the application of the flotation collector; the preparation method specifically comprises the following steps:

[0060] S1, after mixing 2 parts of sodium bicarbonate with 45 parts of water, stirring at 30°C for 10 minutes, then adding 30 parts of N-phenyl-2-mercaptobenzimidazole and 4 parts of sodium fatty alcohol polyoxyethylene ether sulfate in sequence to obtain a mixture, and continuing to stir for 2 hours to obtain solution I;

[0061] S2. At 30°C, dissolve 4 parts of polysorbate 60 in 30 parts of water and start strong stirring at a stirring speed of 700 r / min. Add 8 parts of No. 15 black medicine while stirring. After stirring for 15 minutes, add 10 parts of No. 15 black medicine, 1 part of tributyl phosphate and 3 parts of pine oil. Continue stirring for 1.5 hours to obtain a milky white solution II.

[0062] S3. Mix solution I prepared in step S1 and solution II prepared in step S2 at 25° C. and stir for 1.5 hours to obtain a flotation collector for refractory gold ore.

[0063] S4. The flotation collector of the refractory gold ore is applied to the roughing step of the flotation process of the gold ore with the same grade as that in Example 1, and the added amount of the flotation collector is 100 g / t.

[0064] Example 3

[0065] Example 3 provides a method for preparing a flotation collector for refractory gold ore and the application of the flotation collector; the preparation method specifically comprises the following steps:

[0066] S1, after mixing 6 parts of potassium hydroxide with 40 parts of water, stirring at 25°C for 15 minutes, then adding 25 parts of N-phenyl-2-mercaptobenzimidazole, 2 parts of sodium fatty alcohol polyoxyethylene ether sulfate, and 2 parts of isooctyl phosphate in sequence to obtain a mixture, and continuing to stir for 2 hours to obtain solution I;

[0067] S2. At 30°C, dissolve 3 parts of polysorbate 40 in 30 parts of water and start strong stirring at a stirring speed of 800r / min. Add 8 parts of No. 31 black medicine while stirring. After stirring for 15 minutes, add 10 parts of No. 31 black medicine, 2 parts of tributyl phosphate and 3 parts of pine oil. Continue stirring for 1.5 hours to obtain a milky white solution II.

[0068] S3. Mix solution I prepared in step S1 and solution II prepared in step S2 at 25° C. and stir for 1.5 hours to obtain a flotation collector for refractory gold ore.

[0069] S4. The flotation collector of the refractory gold ore is applied to the roughing step of the flotation process of the gold ore with the same grade as that in Example 1, and the added amount of the flotation collector is 100 g / t.

[0070] After the collectors prepared in Examples 2 to 3 were applied to gold ore flotation, the Au rough concentrate yield, grade and Au recovery rate were tested, and the results are shown in the following table.

[0071] Table 2 Index test results of Examples 2 to 3

[0072] name Au rough concentrate yield / % Au grade (g / t) Au recovery rate / % Example 2 8.58 19.04 90.15 Comparative Example 3 8.18 19.53 89.39

[0073] As can be seen from Table 2, the prepared flotation collector of the present invention only needs to add a small amount of reagents when applied to gold ore flotation to obtain high-grade Au rough concentrate and improve the Au recovery rate; this can reduce the pressure of subsequent processes in the flotation process of the gold ore, or shorten the subsequent redundant process flow, speed up the flotation efficiency, and reduce the process cost.

[0074] In summary, the present invention provides a flotation collector for refractory gold ore and its preparation method and application. The flotation collector is composed of N-phenyl-2-mercaptobenzimidazole, phenol black medicine, surfactant, emulsifier, alkali, defoamer, foaming agent and water. The flotation collector for refractory gold ore is prepared by limiting the composition and content of the flotation collector and adopting a specific preparation method. The flotation collector has good foaming ability and high selectivity and strong collection ability for gold minerals, effectively solving the problem of low flotation recovery rate of refractory gold ore with low Au grade, complex ore properties and high carbonaceous content; it has the characteristics of small amount of reagent used, safety and environmental protection, wide source of raw materials, simple preparation process, and low environmental pollution during application, and also has good market promotion value.

[0075] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing a flotation collector for refractory gold ore, characterized in that: The following steps are involved: S1. After mixing the alkali and water, stirring at 25-35°C, adding N-phenyl-2-mercaptobenzimidazole and a surfactant in sequence to obtain a mixture, and continuing to stir to obtain solution I; S2, dissolving the emulsifier in water, adding 0.3-0.5 times the total weight of phenol black medicine while stirring at 30-35°C, stirring for 15-20 minutes, then adding the remaining phenol black medicine, defoamer and foaming agent, and continuing to stir for 1.5-2 hours to obtain a milky white solution II; S3, mixing the solution I prepared in step S1 and the solution II prepared in step S2 at 25°C, and stirring for 1.5-2h to obtain a flotation collector for refractory gold ore; The flotation collector comprises, by weight: 25-30 parts of N-phenyl-2-mercaptobenzimidazole, 15-20 parts of phenol black medicine, 7.5-9 parts of surfactant, 3-4 parts of emulsifier, 1-2 parts of alkali, 1-2 parts of defoamer, 2-3 parts of foaming agent, and 70-80 parts of water; wherein the emulsifier comprises one or more of polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 80; the defoamer is tributyl phosphate; the foaming agent is pine oil; the phenol black medicine comprises one or more of No. 15 black medicine, No. 25 black medicine, and No. 31 black medicine; the surfactant comprises one or more of sodium lauryl ether sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, and isooctyl alcohol phosphate.

2. The method for preparing a flotation collector for refractory gold ore according to claim 1, characterized in that: The alkali includes one or more of sodium bicarbonate, sodium hydroxide and potassium hydroxide.

3. The method for preparing a flotation collector for refractory gold ore according to claim 1, characterized in that: In terms of parts by weight, in step S1, the weight of water is 40 to 45 parts, and in step S2, the weight of water is 30 to 40 parts.

4. The method for preparing a flotation collector for refractory gold ore according to claim 1, characterized in that: In step S2, the stirring is a strong stirring process, and the rotation speed is 600-800 r / min.

5. The method for preparing a flotation collector for refractory gold ore according to claim 1, characterized in that: In step S1, the stirring time at 25-35° C. is 10-15 min, and the stirring time of the mixture is 1.5-2 h.

6. An application of a flotation collector for refractory gold ores prepared by the preparation method according to any one of claims 1 to 5, characterized in that: The flotation collector is applied to the roughing process of the gold ore flotation process, and the addition amount of the flotation collector is 100-200 g / t.

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