Environment-friendly gold beneficiation aid and preparation method thereof

Abstract

The invention provides an environment-friendly gold beneficiation aid and a preparation method thereof. The aid comprises 30-60 parts of a modified thiosulfate complexing component, 15-30 parts of a catalytic stable oxidation component, 8-20 parts of an interface functional component, 10-25 parts of a buffer component and 5-15 parts of a permeation aid. The preparation method comprises the following steps: performing high-shear mixing on the raw materials to obtain a homogeneous mixture; curing and stabilizing the homogeneous mixture to obtain a cured material; and carrying out air jet pulverization on the cured material until D90 is 20-40 microns, so as to obtain the additive product. According to the additive, by innovatively compounding a modified thiosulfate complexing component and a catalytic oxidation system, cyanide pollution is completely eradicated while efficient leaching of gold is achieved, and the additive has the advantages of environmental protection breakthrough and leaching efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gold ore dressing, and particularly relates to an environmentally-friendly gold ore dressing aid and a preparation method thereof. BACKGROUND

[0002] The gold extraction industry has long relied on sodium cyanide, a highly toxic chemical, as a gold leaching agent. Its leaching efficiency is high and the technology is mature, but the environmental and safety hazards it brings are also very serious. In the cyanide gold extraction process, cyanide residues in the tailings dam and barren solution can enter the surrounding water and soil through percolation, rainwater erosion and other means, not only causing acute toxicity to aquatic organisms, but also threatening human health through biological enrichment. In addition, the transportation, storage and use of cyanide require very high safety protection standards, significantly increasing the complexity of production management and operating costs.

[0003] To address the environmental risks of cyanide, researchers inside and outside the industry have invested a lot of effort in developing non-toxic or low-toxicity alternative gold leaching technologies. Among them, the thiourea method is considered a potential solution, as it can form cationic complexes in acidic media to dissolve gold. However, it is not stable enough in acidic conditions and is prone to decomposition, leading to a sharp increase in consumption, and it has strong corrosiveness to equipment materials, limiting its large-scale industrial application. Another solution is the lime-sulfur reagent method, which uses lime and sulfur as raw materials, has relatively low cost and lower toxicity, but its leaching reaction kinetics is slow, the leaching period is long, and the reagent solution has poor stability in air, with the active ingredients easily losing effectiveness, resulting in large fluctuations in leaching rate and poor reproducibility.

[0004] In recent years, some halide or thiosulfate-based leaching systems have also been studied, but these systems generally have their own limitations. For example, halide systems have strong corrosiveness to equipment and poor selectivity for associated metals in ores, leading to serious impurity co-dissolution and complex subsequent purification processes. The thiosulfate system needs to exist stably in an ammonia environment, and the volatility of ammonia water not only causes a poor working environment, but also results in low actual utilization of reagents, and the system is sensitive to copper, zinc and other interfering elements in ores, and when processing complex associated ores, the leaching effect will be significantly degraded. For the increasing number of low-grade, oxidized or carbon-containing interference material-containing refractory gold ores, existing environmentally-friendly ore dressing aids generally show insufficient adaptability.

[0005] Specifically, in heap leaching application scenarios, the poor matching of the permeability of the reagent and the pore structure of the ore can lead to uneven distribution of the leaching solution, forming leaching dead zones. In agitated leaching scenarios, side reactions of the reagent with gangue minerals can consume a large amount of effective components, and can hinder the effective dissolution of gold due to the coverage of reaction products on the surface of gold particles. In addition, many existing environmentally friendly additive products have relatively simple formula components, lack synergistic effects between components, and are prone to activity reduction due to moisture absorption, oxidation or photolysis during long-term storage, affecting the final use effect.

[0006] Therefore, it is necessary to design an environmentally friendly gold ore dressing additive and a preparation method thereof. SUMMARY

[0007] In order to overcome the defects in the prior art, an environmentally friendly gold ore dressing additive and a preparation method thereof are provided.

[0008] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] An environmentally friendly gold ore dressing additive, which comprises, in parts by mass, 30-60 parts of a modified thiosulfate complex component, 15-30 parts of a catalytic type stable oxidation component, 8-20 parts of an interface functional component, 10-25 parts of a buffer component and 5-15 parts of a penetration aid.

[0010] The modified thiosulfate complex component is prepared by the following steps: ammonium thiosulfate and sodium thiosulfate are mixed at a mass ratio of 1:0.8-1.5, 5%-15% of ammonium citrate and 3%-8% of disodium ethylenediaminetetraacetate are added, ball milling is carried out at 400-500 revolutions per minute for 2-2.5 hours, the ball-to-material mass ratio is 10-12:1, then treatment is carried out in a microwave reactor at a power of 600-800 W and a temperature of 90-110°C for 30-50 minutes, and the modified thiosulfate complex component is obtained.

[0011] The ball milling process is carried out under nitrogen protection, and the specific surface area of the material after ball milling is 0.8-1.5 m² / g.

[0012] The catalytic type stable oxidation component is prepared by the following steps: ammonium persulfate and potassium ferrate are mixed at a mass ratio of 2-2.2:1, after dissolution, an equal volume is impregnated in a mesoporous silica carrier, impregnation is carried out for 2.5-3.5 hours, drying is carried out at 130-150°C for 2.5-3.5 hours, and finally calcination is carried out at 280-320°C for 1.5-2.5 hours, and the catalytic type stable oxidation component is obtained.

[0013] The mesoporous silica carrier has a pore size of 5-15 nm, a specific surface area of 300-500 m² / g, and a loading capacity of 25%-40%.

[0014] The interface functional component is prepared by the following steps: premixing sodium dodecyl sulfonate and alkylphenol polyoxyethylene ether at a mass ratio of 1:1.5-2.0, treating in a low-temperature plasma device under argon-oxygen mixed gas at a power of 150-250 W and a pressure of 20-40 Pa for 8-15 minutes to obtain the interface functional component.

[0015] The oxygen volume fraction in the argon-oxygen mixed gas is 8%-12%.

[0016] The buffer component is a compound of ammonium bicarbonate and dipotassium hydrogen phosphate at a mass ratio of 1:0.8-1; and the penetration aid is a compound of ammonium thiocyanate and urea at a mass ratio of 1:1.8-2.2.

[0017] An environmental-friendly gold ore dressing aid is prepared by the following steps: mixing modified thiosulfate complex component 30-60 parts, catalytic stable oxidation component 15-30 parts, interface functional component 8-20 parts, buffer component 10-25 parts and penetration aid 5-15 parts by mass fraction to obtain a homogeneous mixture; aging and stabilizing the homogeneous mixture to obtain an aged material; airflow crushing the aged material to D90 20-40 microns to obtain the aid product.

[0018] The parameters of the high-shear mixing are: mixing at 40-50 DEG C and 1000-1200 rpm for 50-70 minutes;

[0019] The parameters of the aging and stabilization are: heating to 65-75 DEG C at 15-25 DEG C per hour under nitrogen protection, keeping the temperature for 3-4 hours and then programmed cooling; the nitrogen purity in the aging process is not less than 99.99%, and the programmed cooling rate is controlled at 18-22 DEG C per hour.

[0020] Compared with the prior art, the advantages and beneficial effects of the present application are:

[0021] 1. The modified thiosulfate complex component is treated by mechanical-chemical activation and microwave crystal transformation compound modification process, which significantly improves the chemical stability of the component in the leaching system. This improvement makes the thiosulfate less likely to undergo disproportionation reaction to generate harmful substances such as polythionic acid salts that cause passivation of gold surface, thereby maintaining the continuous and efficient gold leaching capacity, and avoiding the invalid consumption caused by its own decomposition.

[0022] 2. The catalytic stable oxidation component used in the present application creates a composite structure with high selective oxidation capacity by loading ammonium persulfate and potassium ferrate on a mesoporous silica carrier. This structure can preferentially oxidize sulfide minerals or organic carbonaceous films wrapped around gold particles, exposing the gold reaction interface, while effectively regulating the oxidation potential to avoid excessive oxidation and decomposition of the thiosulfate complexing agent. This synergistic effect is difficult to achieve in traditional physical mixing formulations.

[0023] 3. The interface functional component in the present application is treated by low-temperature plasma surface treatment, which optimizes its molecular structure and surface energy. The treated surfactant can spread and adsorb more quickly on the surface of gold minerals and in the pores of the ore, effectively reducing the liquid-solid interfacial tension. This not only improves the penetration and diffusion performance of the reagent, helping to treat fine-grained wrapped gold, but also enhances the contact efficiency of the reagent with gold particles.

[0024] 4. The modified thiosulfate complexing component of the present application provides stable and efficient gold complexing capacity, the catalytic stable oxidation component creates a suitable oxidation environment and removes the diffusion barrier, and the interface functional component ensures efficient transport and contact of the reagent system in complex ore structures. The three components promote each other and together form a highly efficient and stable gold leaching chemical system.

[0025] 5. The present application uses a complex of ammonium bicarbonate and dipotassium hydrogen phosphate as a buffer component, which can automatically maintain the pH of the system within a relatively narrow optimal range during leaching. This self-buffering feature avoids the decomposition of thiosulfate or the decrease of gold leaching rate caused by pH fluctuations, reducing the difficulty of on-site operation. The penetration aid of ammonium thiocyanate and urea further enhances the migration ability of the reagent to the internal pores and cracks of the ore. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] In the specific implementation of the present application, the sources of various main raw materials are briefly described as follows:

[0028] Ammonium thiosulfate, sodium thiosulfate, triammonium citrate, and disodium ethylenediaminetetraacetate: Hubei Chengfeng Chemical Co., Ltd.

[0029] Ammonium persulfate and potassium ferrate: National Pharmaceutical Group Chemical Reagent Co., Ltd.

[0030] Mesoporous silica carrier, sodium dodecyl sulfonate, alkylphenol polyoxyethylene ether: Shanghai Aladdin Biochem Technology Co., Ltd.

[0031] Ammonium bicarbonate: ZhiChuangXingYuan Chemical Co., Ltd.

[0032] Dipotassium hydrogen phosphate: Jinan Shidada Chemical Co., Ltd.

[0033] Ammonium thiocyanate, urea: Hubei Chengfeng Chemical Co., Ltd.

[0034] The technical scheme of the present application is:

[0035] An environmental-friendly gold ore dressing aid, which comprises, by mass fraction, 30-60 parts of modified thiosulfate complex component, 15-30 parts of catalytic type stable oxidation component, 8-20 parts of interface functional component, 10-25 parts of buffer component and 5-15 parts of penetration aid.

[0036] The modified thiosulfate complex component is prepared by the following steps: ammonium thiosulfate and sodium thiosulfate are mixed at a mass ratio of 1:0.8-1.5, 5%-15% of ammonium citrate and 3%-8% of disodium ethylenediaminetetraacetate are added, ball milling is carried out at 400-500 revolutions per minute for 2-2.5 hours, the ball-to-material mass ratio is 10-12:1, then treatment is carried out in a microwave reactor at a power of 600-800 W and a temperature of 90-110℃ for 30-50 minutes, to obtain the modified thiosulfate complex component.

[0037] The ball milling process is carried out under nitrogen protection, and the specific surface area of the material after ball milling is 0.8-1.5 m² / g.

[0038] The catalytic type stable oxidation component is prepared by the following steps: ammonium persulfate and potassium ferrate are mixed at a mass ratio of 2-2.2:1, after dissolution, equal volume is impregnated in mesoporous silica carrier, after impregnation for 2.5-3.5 hours, drying is carried out at 130-150℃ for 2.5-3.5 hours, and finally calcination is carried out at 280-320℃ for 1.5-2.5 hours, to obtain the catalytic type stable oxidation component.

[0039] The mesoporous silica carrier has a pore size of 5-15 nm, a specific surface area of 300-500 m² / g, and a loading capacity of 25%-40%.

[0040] The interface functional component is prepared by the following steps: sodium dodecyl sulfonate and alkylphenol polyoxyethylene ether are premixed at a mass ratio of 1:1.5-2.0, treatment is carried out in a low-temperature plasma device at a power of 150-250 W and a pressure of 20-40 Pa under argon-oxygen mixed gas for 8-15 minutes, to obtain the interface functional component.

[0041] The oxygen gas volume fraction in the argon-oxygen mixed gas is 8%-12%.

[0042] The buffer component is a compound of ammonium bicarbonate and dipotassium hydrogen phosphate with a mass ratio of 1:0.8-1; and the penetration aid is a compound of ammonium thiocyanate and urea with a mass ratio of 1:1.8-2.2.

[0043] A preparation method of an environmentally-friendly gold ore dressing aid, the method comprising the following steps: mixing, by mass fraction, 30-60 parts of modified thiosulfate complex component, 15-30 parts of catalytic type stable oxidation component, 8-20 parts of interface functional component, 10-25 parts of buffer component and 5-15 parts of penetration aid to obtain a homogeneous mixture; aging and stabilizing the homogeneous mixture to obtain an aged material; airflow crushing the aged material to D90 20-40 microns to obtain an aid product.

[0044] The parameters of the high-shear mixing are: 40-50 DEG C, 1000-1200 rpm for 50-70 minutes;

[0045] The parameters of the aging and stabilization are: heating to 65-75 DEG C at 15-25 DEG C per hour under nitrogen protection, holding for 3-4 hours and then programmed cooling; the nitrogen purity in the aging process is not less than 99.99%, and the programmed cooling rate is controlled at 18-22 DEG C per hour.

[0046] The aid of the application realizes efficient gold leaching while completely eliminating cyanide pollution by innovatively compounding modified thiosulfate complex component and catalytic oxidation system, and has the advantages of environmental protection breakthrough and leaching efficiency.

[0047] The application will be described in detail below through examples and comparative examples, but the protection scope of the application is not limited to these examples. The chemical reagents and raw materials used in the following examples and comparative examples are all conventional commercially available products unless otherwise specified.

[0048] Example 1

[0049] The application provides an environmentally-friendly gold ore dressing aid, and the preparation process is as follows. First, a modified thiosulfate complex component is prepared. Ammonium thiosulfate and sodium thiosulfate are mixed in a mass ratio of 1:0.8, wherein the total mass of thiosulfate is taken as a basis of 100 parts, 15% of ammonium citrate and 5.5% of disodium ethylenediaminetetraacetate are added to the total mass of thiosulfate, ball milling is carried out in a ball mill at a speed of 400 rpm for 2.5 hours, the ball-to-material mass ratio is 11:1, the ball milling process is carried out under nitrogen protection, and the specific surface area of the ball-milled material is 0.8 m2 / g; then the ball-milled product is treated in a microwave reactor at a power of 600 W and a temperature of 110 DEG C for 40 minutes to obtain the modified thiosulfate complex component.

[0050] Secondly, the catalytic type stable oxidation component is prepared. Ammonium persulfate and potassium ferrate are mixed at a mass ratio of 2:1, and then the mixture is dissolved and impregnated in the mesoporous silica carrier with a pore size of 5 nm and a specific surface area of 500 m2 / g in equal volumes. After impregnation for 3.5 hours, the carrier is dried at 140°C for 2.5 hours, and finally calcined at 320°C for 2.0 hours. The loading amount is 32.5%, and the catalytic type stable oxidation component is obtained.

[0051] Then, the interface functional component is prepared. Sodium dodecyl sulfonate and alkylphenol polyoxyethylene ether are premixed at a mass ratio of 1:1.5, and then treated in a low-temperature plasma device at a power of 250 W, a pressure of 30 Pa, and an argon-oxygen mixed gas with an oxygen volume fraction of 12% for 8 minutes to obtain the interface functional component. The buffer component is prepared by compounding ammonium bicarbonate and dipotassium hydrogen phosphate at a mass ratio of 1:0.9, and the penetration aid is prepared by compounding ammonium thiocyanate and urea at a mass ratio of 1:1.8.

[0052] Finally, the auxiliary product is prepared. The modified thiosulfate complex component 60 parts, the catalytic type stable oxidation component 22.5 parts, the interface functional component 8 parts, the buffer component 25 parts, and the penetration aid 10 parts are mixed in a high-shear mixer at 50°C and a rotation speed of 1100 rpm for 50 minutes to obtain a homogeneous mixture. The homogeneous mixture is heated to 70°C at a rate of 25°C / h under nitrogen protection, and then cooled at a rate of 22°C / h after holding for 3 hours. After aging, the material is subjected to jet milling to control the particle size D90 to 30 microns to obtain the environmentally friendly gold ore dressing aid product.

[0053] Example 2

[0054] In this embodiment, the same as in Example 1 will not be described again, and the differences are as follows:

[0055] The environmentally friendly gold ore dressing aid is prepared according to the following process. First, the modified thiosulfate complex component is prepared. Thiosulfate ammonium and sodium thiosulfate are mixed at a mass ratio of 1:1.5. Based on 100 parts of the total mass of thiosulfate, 5% of ammonium citrate and 8% of disodium ethylenediaminetetraacetate are added. The mixture is ball milled in a ball mill at a rotation speed of 500 rpm for 2.0 hours, and the ball-to-material mass ratio is 10:1. The ball milling process is carried out under nitrogen protection. The specific surface area of the material after ball milling is 1.5 m2 / g. Then, the ball milling product is treated in a microwave reactor at a power of 800 W and a temperature of 90°C for 50 minutes to obtain the modified thiosulfate complex component.

[0056] Secondly, the catalytic type stable oxidation component is prepared by mixing ammonium persulfate and potassium ferrate according to a mass ratio of 2.2:1, dissolving, and then impregnating the mesoporous silica carrier with the same volume, wherein the carrier has a pore size of 15 nm and a specific surface area of 300 m2 / g, impregnation is performed for 2.5 hours, drying is performed at 150°C for 3.5 hours, and finally calcination is performed at 280°C for 2.5 hours, and the loading amount is 25%, thereby obtaining the catalytic type stable oxidation component.

[0057] Then, the interface functional component is prepared by premixing sodium dodecyl sulfonate and alkylphenol polyoxyethylene ether according to a mass ratio of 1:2.0, and then treating in a low-temperature plasma device under the conditions of an argon-oxygen mixed gas with an oxygen volume fraction of 8% at a power of 150 W and a pressure of 40 Pa for 15 minutes, thereby obtaining the interface functional component. The buffer component is prepared by compounding ammonium bicarbonate and dipotassium hydrogen phosphate according to a mass ratio of 1:1, and the penetration aid is prepared by compounding ammonium thiocyanate and urea according to a mass ratio of 1:2.2.

[0058] Finally, the auxiliary product is prepared by mixing the modified thiosulfate complex component 30 parts, the catalytic type stable oxidation component 30 parts, the interface functional component 20 parts, the buffer component 10 parts, and the penetration aid 15 parts in a high-shear mixer at 40°C and a rotation speed of 1200 rpm for 70 minutes, thereby obtaining a homogeneous mixture; the homogeneous mixture is heated to 75°C at a rate of 15°C per hour under nitrogen protection, and then the temperature is lowered at a rate of 18°C per hour after being kept at 75°C for 4 hours; after aging, the material is subjected to jet milling, and the particle size D90 is controlled to be 20 microns, thereby obtaining the environmentally friendly gold ore dressing aid product.

[0059] Example 3

[0060] In this embodiment, the same as in Example 1 will not be described again, and the differences are described as follows.

[0061] The environmentally friendly gold ore dressing aid is prepared according to the following process. First, the modified thiosulfate complex component is prepared by mixing ammonium thiosulfate and sodium thiosulfate according to a mass ratio of 1:1.15, wherein the total mass of the thiosulfate is taken as a basis of 100 parts, 10% of the total mass of the thiosulfate is ammonium citrate, and 3% of the total mass of the thiosulfate is disodium ethylenediaminetetraacetate, ball milling is performed in a ball mill at a rotation speed of 450 rpm for 2.25 hours, the ball-to-material mass ratio is 12:1, the ball milling process is performed under nitrogen protection, and the specific surface area of the material after ball milling is 1.15 m2 / g; then the ball milling product is treated in a microwave reactor at a power of 700 W and a temperature of 100°C for 30 minutes, thereby obtaining the modified thiosulfate complex component.

[0062] Secondly, the catalytic type stable oxidation component is prepared by mixing ammonium persulfate and potassium ferrate according to a mass ratio of 2.1:1, dissolving, and then impregnating the mesoporous silica carrier with the same volume, wherein the carrier has a pore size of 10 nm and a specific surface area of 400 m2 / g, impregnating for 3.0 hours, drying at 130 DEG C for 3.0 hours, and finally calcining at 300 DEG C for 1.5 hours, so as to obtain the catalytic type stable oxidation component with a loading of 40%.

[0063] Then, the interface functional component is prepared by premixing sodium dodecyl sulfonate and alkylphenol polyoxyethylene ether according to a mass ratio of 1:1.75, treating in a low-temperature plasma device under the conditions of an argon-oxygen mixed gas with an oxygen volume fraction of 10% at a power of 200 W and a pressure of 20 Pa for 11.5 minutes, so as to obtain the interface functional component.

[0064] Finally, the auxiliary product is prepared by mixing the modified thiosulfate complex component 45 parts, the catalytic type stable oxidation component 15 parts, the interface functional component 14 parts, the buffer component 17.5 parts, and the penetration aid 5 parts in a high-shear mixer at 45 DEG C and a rotation speed of 1000 rpm for 60 minutes, so as to obtain a homogeneous mixture; the homogeneous mixture is heated to 65 DEG C at a rate of 20 DEG C per hour under nitrogen protection, and then cooled at a rate of 20 DEG C per hour after being kept at 65 DEG C for 3.5 hours; the material is subjected to jet milling after aging, and the particle size D90 is controlled to be 40 microns, so as to obtain the environmentally friendly gold ore dressing auxiliary product.

[0065] Comparative Example 1

[0066] In the present comparative example, the same as in Example 2 will not be repeated, and the differences are as follows:

[0067] Instead of using the modified thiosulfate complex component, unmodified ammonium thiosulfate and sodium thiosulfate are simply mixed.

[0068] Comparative Example 2

[0069] In the present comparative example, the same as in Example 2 will not be repeated, and the differences are as follows:

[0070] Instead of using the catalytic type stable oxidation component, the loading step is omitted, and ammonium persulfate and potassium ferrate are directly physically mixed.

[0071] Comparative Example 3

[0072] In the present comparative example, the same as in Example 2 will not be repeated, and the differences are as follows:

[0073] Instead of using the interface functional component, a simple mixture of sodium dodecylsulfate and alkylphenol polyoxyethylene ether without plasma treatment was used.

[0074] Comparative Example 4

[0075] In this comparative example, the same as Example 2 is not repeated, and the differences are described as follows:

[0076] No buffer component is used, i.e. ammonium bicarbonate and dipotassium hydrogen phosphate are omitted.

[0077] Comparative Example 5

[0078] In this comparative example, the same as Example 2 is not repeated, and the differences are described as follows:

[0079] No penetration aid is used, i.e. ammonium thiocyanate and urea are omitted.

[0080] Performance test results and analysis

[0081] The auxiliary agents were prepared according to the parameters of the examples and comparative examples, respectively, and the test methods were evaluated by using general standard methods to ensure the comparability of the results. The gold leaching rate test was carried out by bottle leaching experiment, using a fixed mass of gold ore sample to react with the auxiliary agent solution under standard conditions, and measuring the gold content in the leaching solution to calculate the leaching rate; the thiosulfate consumption rate was determined by titration method to measure the amount of thiosulfate reduced in the leaching process; the penetration rate was calculated by measuring the change of the auxiliary agent solution in the standard ore column with time; the pH stability was evaluated by monitoring the change range of the pH value in the leaching process; the activity retention rate after storage was measured by comparing the gold leaching rate of the auxiliary agent after being placed under accelerated storage conditions, i.e. 40 degrees Celsius and 75% relative humidity, with that of the fresh sample. All tests were repeated three times to take the average value, and the test results are shown in Table 1.

[0082] As can be seen from Table 1, the present application achieves excellent performance through component modification and synergistic effect. In terms of gold leaching rate, all examples reach more than 90%, while the comparative examples are significantly lower, which is due to the improvement of the stability of the modified thiosulfate complexing component. The unmodified component in Comparative Example 1 leads to an increase in thiosulfate consumption, indicating that mechanical chemical activation and microwave treatment effectively inhibit the disproportionation reaction and reduce the generation of harmful substances.

[0083] Table 1 Analysis test results

[0084]

[0085] The consumption rates of thiosulfate in the examples are all below 10%, while those in the comparative examples are all above 15%, which confirms that the loading structure of the catalytic stable oxidizing component optimizes the oxidation potential and avoids excessive decomposition of the complexing agent. The penetration rate data show that the examples are significantly higher than the comparative examples, especially the untreated interface functional component in Comparative Example 3 leads to the lowest rate, which reflects the optimization of the plasma surface treatment on the molecular structure and surface energy, enhancing the spreading and adsorption of the reagent in the ore pores.

[0086] In terms of pH stability, the pH change range of the examples is narrow, while the range in Comparative Example 4 is wide due to the lack of buffer component, which verifies the self-buffering ability of the ammonium bicarbonate and dipotassium hydrogen phosphate complex, maintaining the optimal pH environment of the leaching system. The activity retention rate after storage is higher than 95% in the examples, while it is lower than 90% in the comparative examples, which shows that the maturation and stabilization process in the preparation method of the present application promotes the interaction between the components and improves the long-term storage stability.

[0087] The synergistic effect among the modified thiosulfate complexing component, the catalytic stable oxidizing component and the interface functional component, as well as the auxiliary function of the buffer component and the penetration aid in the present application, contribute to the high-efficiency and stable gold leaching performance.

[0088] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An environmentally friendly gold ore dressing aid, characterized in that, The auxiliary agent comprises modified thiosulfate complex component 30-60 parts by mass, catalytic stable oxidation component 15-30 parts by mass, interface functional component 8-20 parts by mass, buffer component 10-25 parts by mass and penetration auxiliary agent 5-15 parts by mass.

2. The environmentally friendly gold ore dressing aid according to claim 1, characterized in that, The modified thiosulfate complex component is prepared by the following steps: mixing ammonium thiosulfate and sodium thiosulfate at a mass ratio of 1:0.8-1.5, adding 5%-15% of ammonium citrate and 3%-8% of disodium ethylenediaminetetraacetate based on the total mass of thiosulfate, ball milling at 400-500 revolutions per minute for 2-2.5 hours, with a ball-to-material mass ratio of 10-12:1, then treating in a microwave reactor at a power of 600-800 W and a temperature of 90-110℃ for 30-50 minutes to obtain the modified thiosulfate complex component.

3. The environmentally friendly gold ore dressing aid according to claim 2, characterized in that, The ball milling process is carried out under nitrogen protection, and the specific surface area of the material after ball milling is 0.8-1.5 m² / g.

4. The environmentally friendly gold ore dressing aid according to claim 1, characterized in that, The catalytic stable oxidation component is prepared by the following steps: mixing ammonium persulfate and potassium ferrate at a mass ratio of 2-2.2:1, dissolving, and then impregnating in a mesoporous silica carrier at an equal volume, drying at 130-150℃ for 2.5-3.5 hours after impregnation for 2.5-3.5 hours, and finally calcining at 280-320℃ for 1.5-2.5 hours to obtain the catalytic stable oxidation component.

5. The environmentally friendly gold ore dressing aid according to claim 4, characterized in that, The mesoporous silica carrier has a pore size of 5-15 nm, a specific surface area of 300-500 m² / g, and a loading capacity of 25%-40%.

6. The environmentally friendly gold ore dressing aid according to claim 1, characterized in that, The interface functional component is prepared by the following steps: pre-mixing sodium dodecyl sulfonate and alkylphenol polyoxyethylene ether at a mass ratio of 1:1.5-2.0, treating in a low-temperature plasma device at a power of 150-250 W and a pressure of 20-40 Pa in an argon-oxygen mixed gas for 8-15 minutes to obtain the interface functional component.

7. The environmentally friendly gold ore dressing aid according to claim 6, characterized in that, The oxygen volume fraction in the argon-oxygen mixed gas is 8%-12%.

8. The environmentally friendly gold ore dressing aid according to claim 1, characterized in that, The buffer component is a compound of ammonium bicarbonate and dipotassium hydrogen phosphate at a mass ratio of 1:0.8-1; and the penetration auxiliary agent is a compound of ammonium thiocyanate and urea at a mass ratio of 1:1.8-2.

2.

9. A method for preparing the environmentally friendly gold ore dressing aid according to any one of claims 1-8, characterized by, The method comprises the following steps: high-shear mixing modified thiosulfate complex component 30-60 parts by mass, catalytic stable oxidation component 15-30 parts by mass, interface functional component 8-20 parts by mass, buffer component 10-25 parts by mass and penetration auxiliary agent 5-15 parts by mass to obtain a homogeneous mixture; aging and stabilizing the homogeneous mixture to obtain an aged material; airflow crushing the aged material to D90 20-40 microns to obtain an auxiliary agent product.

10. The preparation method of the environmentally friendly gold ore dressing aid according to claim 9, characterized in that, The parameters of the high-shear mixing are: mixing at 40-50℃ and 1000-1200 revolutions per minute for 50-70 minutes; The parameters of the aging and stabilization are: heating to 65-75℃ at a rate of 15-25℃ per hour under nitrogen protection, and then programmed cooling after holding for 3-4 hours; the nitrogen purity in the aging process is not less than 99.99%, and the programmed cooling rate is controlled at 18-22℃ per hour.

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