CN115921124A - Flotation collector for refractory gold ores and preparation method and application thereof - Google Patents

Abstract

The invention provides a flotation collector for refractory gold ores and a preparation method and application thereof, wherein the flotation collector comprises, by weight, 25-30 parts of N-phenyl-2-mercaptobenzimidazole, 15-20 parts of phenol black, 7.5-9 parts of a surfactant, 3-4 parts of an emulsifier, 1-2 parts of alkali, 1-2 parts of an antifoaming agent, 2-3 parts of a foaming agent and 70-80 parts of water. The preparation method of separately preparing the solution I and the solution II and fully mixing the two solutions is adopted, so that the synergistic effect between medicaments can be effectively exerted, and the collecting agent with stable foam, strong collecting effect and selectivity is obtained. When the flotation collecting agent is applied to gold ore flotation, the recovery rate and grade of fine-grain-particle gold ore dressing are effectively improved, and the effects of roughing, pre-enriching and flotation environment adjusting and optimizing of low-grade, easy-to-float and easy-to-argillization gold ores are particularly obvious; the method also has the characteristics of small dosage of the medicament, remarkable flotation effect, safety, environmental protection and high market popularization value.

Description

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

technical field

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

Background technique

In the gold ore flotation industry, thio compounds are often used as collectors, such as butyl xanthate, isopentyl xanthate and butylammonium black medicine. This type of gold collector has a good flotation index for gold ore with a single property. However, with the prominence of "poor, fine, and miscellaneous" characteristics of gold ore in recent years, the grade of gold ore is declining year by year, and the ore properties are more complicated. , the embedded particle size is fine, and the content of impurities such as carbonaceous matter and arsenic is high, which causes problems such as poor selectivity and weak collection capacity in the process of gold ore flotation collectors, which in turn affects the separation index and reduces the economic benefits of the enterprise .

In order to adapt to the complexity and difficulty of the existing gold ore, improve the flotation index of gold ore, and take into account the economic benefits and environmental protection issues of the production unit, based on the theory of flotation reagent compounding and assembly, many researchers in the industry have devoted themselves to new Development of flotation agents. For example, the invention patent (application number 202110771617.3) discloses a gold ore composite collector and its application. The composite collector includes the main collector xanthate, black powder and fatty acid salt, and the auxiliary collector Caprylic acid thiamine, RA935 and sodium linoleate; the synergistic effect between the collectors was used to improve the collection effect of gold minerals and gold-bearing oxides in quartz vein-altered rock type gold deposits; however, the The composition of composite collectors is complex, and the chemical waste produced is difficult to deal with, and the composite collector still has certain limitations in the flotation of low-grade, easy-to-float and easy-mudging gold ores that have a large stock at present, such as A larger dosage of reagents will strengthen the collection ability of gold minerals and buoyant gangue, deteriorate the flotation environment, and make it difficult for the reagents to show selectivity. The increase of ore circulation makes it difficult to guarantee the grade of the final product.

In addition, the new collectors developed in the prior art, such as Y-89 series, MA xanthate and MB xanthate series of high-efficiency gold collectors, etc., have achieved certain application research results and generally improve the collection performance. However, the selectivity of the reagent is reduced, and the recovery effect of fine-particle gold still needs to be improved; and when the above-mentioned collector is applied, it is affected by its limited effect on the recovery of difficult-to-select fine-particle gold. Multiple times of roughing, beneficiation, and sweeping are required to improve the overall recovery rate and grade of gold ore, which makes the process longer and the flotation efficiency low.

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.

Contents of the invention

The object of the present invention is to provide a kind of flotation collector of refractory gold ore and its preparation method and application. This flotation collector can effectively overcome the problems of poor selectivity and weak collection ability of conventional xanthate and black drug-like gold collectors for fine-grained gold, micro-particle gold or "carbon-robbed gold". Bubble layer can effectively improve the recovery rate and grade of fine-particle gold ore dressing, especially for roughing pre-enrichment and flotation environment adjustment and optimization of low-grade, easy-to-float and easy-mud gold ore. It has the characteristics of safety and environmental protection, wide source of raw materials and simple preparation process.

In order to realize the above-mentioned invention object, the present invention provides a kind of flotation collector of refractory gold ore, comprises by weight: 25～30 parts of N-phenyl-2-mercaptobenzimidazole, 15～20 parts phenol black, 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, 70-80 parts of water.

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

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

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 phosphate.

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

The present invention also provides a kind of preparation method of the flotation collector of refractory gold ore, comprising the following steps:

S1. After mixing the alkali and water, stir at 25-35°C, then add N-phenyl-2-mercaptobenzimidazole and surfactant in sequence to obtain a mixture, and continue stirring to obtain solution I;

S2. Dissolve the emulsion in water, add 0.3 to 0.5 times the total weight of phenol black while stirring at 30 to 35°C, stir for 15 to 20 minutes, then add the remaining phenol black and tributyl phosphate Add ester and terpineol oil to it, and continue to stir for 1.5-2 hours to obtain a milky white solution II;

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

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

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.

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

The present invention also provides the application of a flotation collector for refractory gold ore. The flotation collector is used in the roughing process of the gold ore flotation process, and the amount of the flotation collector is 100-200g /t.

The beneficial effects of the present invention are:

1. The present invention provides a kind of flotation collector of refractory gold ore and its preparation method and application. The flotation collector consists of N-phenyl-2-mercaptobenzimidazole, phenol black drug, surface active Agent, emulsifier, alkali, defoamer, foaming agent and water, by limiting the composition and content of the flotation collector, using a specific preparation method to prepare the refractory gold ore flotation collector. This gold ore flotation collector effectively overcomes the problems of poor selectivity and weak collection ability of conventional xanthate and black drug gold collectors for fine-grained gold, micro-particle gold or "carbon-robbed gold". The bubble layer effectively improves the recovery rate and grade of fine-particle gold ore dressing, especially for the adjustment and optimization of roughing pre-enrichment and flotation environment of low-grade, easy-to-float and easy-mud gold ore. It has the characteristics of small size, safety and environmental protection, wide source of raw materials, simple preparation process and little environmental pollution, and also has good market promotion value.

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

3. By mixing tributyl phosphate and terpineol oil in proportion to the O/W emulsion, the present invention can significantly adjust the flotation process for gold ores that are easy to float, easy to muddy, and highly sensitive to ore slime. The foam state effectively guarantees the stability, richness and selectivity of the flotation foam; the prepared gold flotation collector should show higher selectivity and stronger collection capacity for gold minerals, and the flotation foam is stable and solid , speed up the flotation rate of fine-grained gold minerals, and achieve excellent flotation indicators, especially when the raw ore Au grade is low, the flotation collector shows good ore adaptability.

4. The flotation collector of the refractory gold ore of the present invention can be prepared under normal temperature and pressure, the process is simple, the solubility is good, and the irritating odor of the usual xanthate gold ore flotation collector is overcome. , Large chemical dust, difficult to configure and add, etc. It has the advantages of small chemical dosage and remarkable flotation effect.

5. The flotation collector of the present invention is mainly used in the flotation operation of low-grade raw ore, easy to float and easy to muddy gold ore, and enhances its concentration by modifying the flotation agent and strengthening the regulation of the mineralized foam layer. The selectivity of gold, on the premise of retaining the strong collection of chemicals, significantly increases the enrichment ratio of roughing, reduces the circulation of pumiceous gangue in the selection section, and reduces the amount of chemicals; in addition, the price of related chemicals in the plan Low cost, wide range of sources, green and environmental protection.

Description of drawings

Fig. 1 is a schematic diagram of the application process of the flotation collector of the refractory gold ore of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the structures and/or processing steps closely related to the solution of the present invention are shown in the drawings, and the steps related to the present invention are omitted. Invent other details that don't really matter.

Additionally, it should be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also Other elements not expressly listed, or inherent to the process, method, article, or apparatus are also included.

A flotation collector for refractory gold ores, comprising: 25-30 parts of N-phenyl-2-mercaptobenzimidazole, 15-20 parts of phenol black, 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, 70-80 parts of water. The flotation collector of the refractory gold ore effectively overcomes the problems of poor selectivity and weak collection ability of conventional xanthate and black drug-like gold collectors for fine-grained gold, particulate gold or "carbon-robbed gold". By regulating the foaming layer, the recovery rate and grade of fine-particle gold ore dressing are effectively improved, especially for the adjustment and optimization of roughing pre-enrichment and flotation environment of low-grade, easy-to-float and easy-mud gold ore. It has the characteristics of small dosage of medicine, safety and environmental protection, wide source of raw materials, simple preparation process and little environmental pollution, and also has good market promotion value.

Specifically, the antifoaming agent is tributyl phosphate, and the foaming agent is terpineol 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 phosphate. Alkali comprises one or more in sodium bicarbonate, sodium hydroxide, potassium hydroxide.

In particular, the addition of tributyl phosphate and terpineol oil can significantly adjust the state of the flotation foam during the flotation of gold ores that are easy to float and muddy, and have high slime sensitivity, effectively ensuring the stability of the flotation foam, Richness and selectivity; the prepared gold flotation collector should show higher selectivity and stronger collection capacity for gold minerals, and the flotation foam is stable and solid, which speeds up the floating rate of fine-grained gold minerals, and has achieved Excellent flotation index, especially when the raw ore Au grade is low, the flotation collector shows good ore adaptability.

A preparation method of a flotation collector for refractory gold ore, comprising the following steps:

S1. After mixing the alkali and water, stir at 25-35°C, then add N-phenyl-2-mercaptobenzimidazole and surfactant in sequence to obtain a mixture, and continue stirring to obtain solution I;

S2. Dissolve the emulsion in water, add 0.3 to 0.5 times the total weight of phenol black while stirring at 30 to 35°C, stir for 15 to 20 minutes, then add the remaining phenol black and tributyl phosphate Add ester and terpineol oil to it, and continue to stir for 1.5-2 hours to obtain a milky white solution II;

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

Specifically, in step S1, the weight part of water is 40-45 parts; the stirring time at 25-35° C. is 10-15 minutes, and the stirring time of the mixture is 1.5-2 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 medicament.

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

In this preparation method, solution Ⅰ and solution Ⅱ are prepared separately, the purpose is to make the surface activity of the prepared drug higher, avoid the conflict effect of the drug in the preparation process, and make the drug system more stable; the two solutions are fully mixed and prepared The obtained flotation collector can effectively exert the synergistic effect between the agents, enhance the collision probability and surface adsorption effect between the collector and the target mineral, and obtain a gold mine collector with strong collection effect and selectivity.

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

It should be noted that, in the actual gold ore flotation process, not only need to add the flotation collector of the present invention, but also need to cooperate with other types of medicaments to carry out flotation of gold ore according to the type of raw ore or the requirements for products. to obtain products that meet the requirements.

Example 1

Embodiment 1 provides a kind of preparation method of the flotation collector of refractory gold ore and the application of this flotation collector; The preparation method specifically comprises the following steps:

S1. After mixing 2 parts of sodium hydroxide and 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, continue Stir for 1.5h to obtain solution I;

S2. At 35°C, dissolve 3 parts of polysorbate 80 in 35 parts of water and start strong stirring at a stirring speed of 800r/min. While stirring, add 5 parts of No. 25 black medicine, stir for 15 minutes, and then add 10 parts Add No. 25 black medicine, 2 parts of tributyl phosphate and 2 parts of terpineol oil, and continue stirring for 1.5 hours to obtain a milky white solution II;

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

Please refer to Figure 1, the flotation collector of refractory gold ore is applied in the roughing process of gold ore flotation process, and the addition amount of flotation collector is 100g/t. The raw ore is a high-carbon quartz vein gold ore with a grade of 1.88g/t in Yunnan. The specific process flow is shown in Figure 1.

Comparative example 1

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

Comparative example 2

Comparative example 2 provides a kind of preparation method of the flotation collector of refractory gold ore and the application of this flotation collector, compared with embodiment 1, difference is that the solution is not prepared in steps, the All raw materials were directly mixed at 25° C. to prepare a flotation collector, and the rest were roughly the same as those in Example 1, and will not be repeated here.

Comparative example 3

Comparative Example 3 provides a preparation method of a flotation collector for refractory gold ores and the application of the flotation collector. Compared with Example 1, the difference is that in step S2, no 2 parts of tributyl phosphate, all the other are roughly the same as in Example 1, and will not be repeated here.

After the collectors in Example 1 and Comparative Examples 1-3 were applied to gold ore flotation, the yield, grade and Au recovery rate of Au crude concentrate were detected, and the results obtained are shown in the table below.

The index detection result of table 1 embodiment 1 and comparative examples 1～3

name Au coarse concentrate yield/% Au grade (g/t) Au recovery/% 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

It can be seen from Table 1 that the Au rough concentrate grade and Au recovery rate in Example 1 are the highest. Compared with Comparative Example 1, the Au rough concentrate grade is >19g/t, and the Au recovery rate is increased by about 3%. 2. The yield of Au coarse concentrate 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 of gold minerals Ability; In conjunction with Comparative Example 3, the tributyl phosphate used in the present invention can impel the flotation foam to be stable and solid, and accelerate the floating rate of fine-grained gold minerals.

Example 2

Embodiment 2 provides a kind of preparation method of the flotation collector of refractory gold ore and the application of this flotation collector; The preparation method specifically comprises the following steps:

S1. After mixing 2 parts of sodium bicarbonate and 45 parts of water, stir at 30°C for 10 minutes, then add 30 parts of N-phenyl-2-mercaptobenzimidazole and 4 parts of fatty alcohol polyoxyethylene ether sodium sulfate to obtain The mixture was stirred for 2h to obtain solution I;

S2. At 30°C, dissolve 4 parts of polysorbate 60 in 30 parts of water and start strong stirring at a stirring speed of 700r/min. While stirring, add 8 parts of No. 15 black medicine, stir for 15 minutes, and then add 10 parts Add No. 15 black medicine, 1 part of tributyl phosphate and 3 parts of terpineol oil, and continue stirring for 1.5 hours to obtain a milky white solution II;

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 hours to obtain a flotation collector for refractory gold ore.

S4. Apply the flotation collector of the refractory gold ore to the roughing process of the gold ore flotation process with the same grade as in Example 1, and the addition amount of the flotation collector is 100 g/t.

Example 3

Embodiment 3 provides a kind of preparation method of the flotation collector of refractory gold ore and the application of this flotation collector; The preparation method specifically comprises the following steps:

S1. Mix 6 parts of potassium hydroxide with 40 parts of water, stir at 25°C for 15 minutes, then add 25 parts of N-phenyl-2-mercaptobenzimidazole, 2 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 2 parts of isooctyl phosphate to obtain the mixture, and continue to stir for 2 hours to obtain solution I;

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. While stirring, add 8 parts of No. 31 black medicine, stir for 15 minutes, and then add 10 parts Add No. 31 black medicine, 2 parts of tributyl phosphate and 3 parts of terpineol oil, and continue stirring for 1.5 hours to obtain milky white solution II;

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 hours to obtain a flotation collector for refractory gold ore.

S4. Apply the flotation collector of the refractory gold ore to the roughing process of the gold ore flotation process with the same grade as in Example 1, and the addition amount of the flotation collector is 100 g/t.

After the collectors prepared in Examples 2-3 were applied to gold ore flotation, the yield, grade and Au recovery rate of Au crude concentrate were detected, and the results obtained are shown in the table below.

The index detection result of table 2 embodiment 2～3

name Au coarse 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

As can be seen from Table 2, when the flotation collector prepared by the present invention is applied to gold ore flotation, only a small amount of reagent needs to be added to obtain high-grade Au rough concentrate, and the recovery rate of Au is improved; The pressure of subsequent processes in the gold ore flotation process can be reduced, or the subsequent redundant process flow can be shortened, the flotation efficiency is accelerated, and the process cost is reduced.

In summary, the present invention provides a flotation collector of refractory gold ore and its preparation method and application. The flotation collector consists of N-phenyl-2-mercaptobenzimidazole, phenol black , surfactant, emulsifier, alkali, defoamer, foaming agent and water, by limiting the composition and content of the flotation collector, using a specific preparation method to prepare the refractory gold ore flotation collector . The flotation collector has good foaming ability, high selectivity and strong collection ability for gold minerals, and effectively solves the problem of refractory gold ore flotation with low Au grade, complex ore properties and high carbonaceous content. The problem of low recovery rate; it has the characteristics of small dosage of medicament during application, safety and environmental protection, wide source of raw materials, simple preparation process, and little environmental pollution, and also has good market promotion value.

The above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. A flotation collector for refractory gold ores is characterized by comprising the following components in parts by weight: 25 to 30 parts of N-phenyl-2-mercaptobenzimidazole, 15 to 20 parts of phenol black, 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.

2. The flotation collector for the refractory gold ores according to claim 1, wherein the defoaming agent is tributyl phosphate, and the foaming agent is pine oil; the phenolic jettison comprises one or more of No. 15 jettison, no. 25 jettison and No. 31 jettison.

3. The flotation collector for refractory gold ores according to claim 1, wherein the emulsifier comprises one or more of polysorbate 20, polysorbate 40, polysorbate 60 and polysorbate 80.

4. The flotation collector for refractory gold ores according to claim 1, wherein the surfactant comprises one or more of sodium lauryl ether sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate and isooctyl alcohol phosphate.

5. The flotation collector for refractory gold ores according to claim 1, wherein the alkali comprises one or more of sodium bicarbonate, sodium hydroxide and potassium hydroxide.

6. The preparation method of the flotation collector for the refractory gold ores, which is disclosed by any one of claims 1 to 5, is characterized by comprising the following steps of:

s1, mixing alkali and water, stirring at 25-35 ℃, sequentially adding N-phenyl-2-mercaptobenzimidazole and a surfactant to obtain a mixture, and continuously stirring to obtain a solution I;

s2, dissolving the emulsion in water, adding the phenol black powder accounting for 0.3 to 0.5 time of the total weight of the phenol black powder while stirring at the temperature of between 30 and 35 ℃, stirring for 15 to 20 minutes, adding the rest of the phenol black powder, tributyl phosphate and pine oil into the mixture, and continuously stirring for 1.5 to 2 hours to prepare a milky solution II;

and S3, mixing the solution I prepared in the step S1 and the solution II prepared in the step S2 at 25 ℃, and stirring for 1.5-2 hours to obtain the flotation collector for the refractory gold ores.

7. The method for preparing a flotation collector for refractory gold ores according to claim 6, wherein the weight part of water in step S1 is 40-45 parts, and the weight part of water in step S2 is 30-40 parts.

8. The preparation method of the flotation collector for the refractory gold ores according to claim 6, wherein in the step S2, the stirring is a strong stirring process, and the rotating speed is 600-800 r/min.

9. The method for preparing the flotation collector for the refractory gold ores according to claim 6, wherein in the step S1, the stirring time at 25-35 ℃ is 10-15 min, and the stirring time of the mixture is 1.5-2 h.

10. The use of the flotation collector for the refractory gold ores according to any one of claims 1 to 5 or the flotation collector for the refractory gold ores prepared by the preparation method according to any one of claims 6 to 9, wherein the flotation collector is used in a roughing step of a gold ore flotation process, and the addition amount of the flotation collector is 100 to 200g/t.

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