Medicament for treating beneficiation wastewater and preparation method thereof

Abstract

This invention belongs to the field of wastewater treatment technology, specifically relating to a reagent for treating mineral processing wastewater and its preparation method. The reagent comprises the following components by weight: 5-15 parts flocculant, 10-20 parts coagulant aid, 8-12 parts nonionic surfactant, 10-15 parts anionic surfactant, 1-3 parts foaming agent, 10-15 parts starch, and 20-30 parts water. This invention utilizes carbon nanotube-acetyloxyoxime acid complex-modified polyacrylamide as a flocculant, and combines it with samarium-doped polyaluminum magnesium chloride as a coagulant aid, to synergistically achieve the efficient and simultaneous removal of heavy metal ions, COD, and suspended solids.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a reagent for treating mineral processing wastewater and its preparation method. Background Technology

[0002] The mineral processing process generates a large amount of wastewater containing suspended solids, heavy metal ions, and organic reagents. Direct discharge of this wastewater would cause serious harm to the ecological environment. Currently, commonly used agents for treating mineral processing wastewater mainly include flocculants, coagulants, and surfactants. Among them, polyacrylamide-based organic flocculants are widely used due to their strong bridging effect and rapid floc formation, while inorganic coagulants such as polyaluminum chloride effectively coagulate fine mud and colloidal particles through charge neutralization and adsorption bridging. The combined use of these agents can achieve rapid sedimentation of suspended solids in a short time, significantly reducing wastewater turbidity and meeting the primary purification requirements of mineral processing wastewater to a certain extent.

[0003] However, existing agents for treating mineral processing wastewater still have many technical shortcomings. On the one hand, traditional polyacrylamide flocculants lack specific adsorption capacity for heavy metal ions, resulting in limited removal of dissolved heavy metal ions in wastewater. Furthermore, their linear molecular chain structure is prone to coiling and deactivation in wastewater with high salinity or large pH fluctuations, leading to a sharp decline in flocculation performance. On the other hand, the hydrolysis products of conventional polyaluminum chloride coagulant aids are mainly oligomers, forming loose flocs with slow settling rates. Hydrolysis is hindered at low temperatures, significantly deteriorating the flocculation effect. Simultaneously, their adsorption and complexation capacity for heavy metal ions and residual mineral processing agents is insufficient, making it difficult to achieve high-standard wastewater purification. In addition, the synergistic mechanism of flocculants and coagulants in existing technologies is singular, lacking multiple removal functions targeting heavy metal ions and organic pollutants. The treated effluent still requires further advanced treatment to meet discharge standards or for reuse.

[0004] Therefore, there is an urgent need to develop a mineral processing wastewater treatment agent that combines efficient flocculation and sedimentation, strong heavy metal ion adsorption capacity, and wide adaptability, so as to achieve efficient purification and resource reuse of mineral processing wastewater. Summary of the Invention

[0005] The primary objective of this invention is to provide a reagent for treating mineral processing wastewater, which achieves efficient and stable removal of heavy metal ions, COD, and suspended solids.

[0006] The second objective of this invention is to provide a method for preparing the above-mentioned reagent for treating mineral processing wastewater, which has a simple process.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A reagent for treating mineral processing wastewater, the reagent comprising the following components in parts by weight: 5-15 parts flocculant, 10-20 parts coagulant aid, 8-12 parts nonionic surfactant, 10-15 parts anionic surfactant, 1-3 parts foaming agent, 10-15 parts starch, and 20-30 parts water. The preparation method of the flocculant includes the following steps: (1) Add an ethanol solution containing sodium ethoxide to the mixture of pretreated carbon nanotubes and hydroxylamine sulfate, then add ethyl acetate and stir. Adjust the pH to 5.5-6.5 and separate to obtain carbon nanotube-acetoxyoxime complex. (2) The carbon nanotube-acetoxyoxime complex was mixed with polyacrylamide to obtain a flocculant.

[0008] Further, in step (1), the ratio of the amount of pretreated carbon nanotubes, hydroxylamine sulfate, sodium ethoxide, ethyl acetate and ethanol is 10 g: (15-17) g: (12-35) g: (30-32) mL: (120-150) mL; the pH adjustment uses a 1-2 mol / L sulfuric acid solution; the stirring time is 1-2 h.

[0009] Furthermore, the dropping rate of the ethanol solution containing sodium ethoxide was 2 mL / min; the dropping rate of ethyl acetate was 0.4 mL / min.

[0010] Further, in step (2), the mass ratio of the carbon nanotube-acetoxyoxime complex to polyacrylamide is 1:(8-12); the stirring speed is 1000-1200 rpm and the time is 8-12 min.

[0011] Further, the pretreated carbon nanotubes in step (1) are obtained by adding carbon nanotubes to a mixed acid of concentrated sulfuric acid and concentrated nitric acid, ultrasonically dispersing, stirring, separating, washing and drying.

[0012] Furthermore, the ratio of carbon nanotubes, concentrated sulfuric acid, and concentrated nitric acid is 1 g:(240-270) mL:(80-90) mL; the ultrasonic dispersion time is 20-40 min; and the stirring treatment temperature is 70-80 ℃ and the time is 20-30 h.

[0013] Furthermore, the preparation method of the coagulant aid includes the following steps: Polyaluminum chloride was added to a dilute hydrochloric acid solution, followed by magnesium oxide and samarium oxide. The mixture was heated to react, cooled and allowed to stand, and the supernatant was collected and evaporated to dry, thus obtaining the coagulant aid.

[0014] Furthermore, the ratio of the polyaluminum chloride, magnesium oxide, samarium oxide and dilute hydrochloric acid solution is 10 g: (3-5) g: (1-2) g: (20-50) mL; the concentration of the dilute hydrochloric acid is 18-22 wt%.

[0015] Furthermore, the heating reaction is carried out at a temperature of 50-60 °C for 2-4 h; the cooling and settling time is 10-20 h.

[0016] Furthermore, the nonionic surfactant is a sucrose fatty acid ester; the anionic surfactant is sodium lauryl ester; and the foaming agent is pine oil.

[0017] The preparation method of the above-mentioned reagent for treating mineral processing wastewater includes the following steps: The flocculant, coagulant aid, nonionic surfactant, anionic surfactant, foaming agent, starch and water are mixed and stirred in a certain proportion to obtain the agent for treating mineral processing wastewater.

[0018] The beneficial technical effects of this invention are as follows: 1. This invention utilizes a carbon nanotube-acetoxyxamic acid complex as a flocculant in polyacrylamide, which significantly enhances its specific adsorption capacity for metal ions. Carbon nanotubes possess a hollow tubular structure, well-developed pores, and a large specific surface area, providing abundant active sites for effective adsorption of metal ions in wastewater. After surface pretreatment, the complex is combined with acetoxyxamic acid, which exhibits excellent complexing ability, further immobilizing metal ions. Simultaneously, the composite modification improves the dispersibility of carbon nanotubes in wastewater and the stability of acetoxyxamic acid. Incorporating this complex into polyacrylamide optimizes the system's dispersion performance, thereby enhancing the flocculant's adsorption and immobilization effect on metal ions in wastewater.

[0019] 2. This invention uses samarium-doped polyaluminum magnesium chloride as a coagulant aid, which can effectively enhance the adsorption capacity for suspended particulate matter. Polyaluminum magnesium chloride hydrolyzes to form aluminum-magnesium polynuclear hydroxyl complexes, which coagulate fine mud and colloids through charge neutralization and adsorption, forming floc nuclei and achieving particle destabilization. Samarium ions have high charge density and polarization ability, and also exhibit good adsorption and complexation effects on heavy metal ions and anions. After doping, they form copolymers with aluminum and magnesium ions, giving the coagulant aid a higher surface positive charge density and a more developed three-dimensional network structure, further enhancing the charge neutralization and destabilization effect. The resulting flocs have high density, fast settling rate, and improved acid-base stability and low-temperature stability.

[0020] 3. This invention employs a system combining organic flocculants and inorganic coagulants. First, samarium-doped polyaluminum magnesium chloride is used to aid coagulation and destabilize the system. Then, polyacrylamide doped with carbon nanotube-acetyloxyoxime acid complex is used for adsorption and flocculation. The synergistic effect of the two significantly improves the flocculation and sedimentation efficiency and has a wide range of applications. Attached Figure Description

[0021] Figure 1 A scanning electron microscope image of the flocculant prepared in Example 1 of this invention; Figure 2 The image shows a scanning electron microscope (SEM) image of the coagulant prepared in Example 5 of this invention. Detailed Implementation

[0022] The following is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention. Specific conditions not specified in the embodiments are performed according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, all reagents or instruments used are conventional products obtained through commercial channels.

[0023] (a) Preparation example Preparation Example 1 Preparation Example 1 provides a flocculant prepared by the following process: (1) According to the ratio of carbon nanotubes to concentrated sulfuric acid and concentrated nitric acid 1 g: 260 mL: 85 mL, carbon nanotubes were added to a mixed acid composed of concentrated sulfuric acid (98 wt%) and concentrated nitric acid (65 wt%), ultrasonically dispersed for 30 min, and then stirred at 75 °C for 25 h. After separation, washing and drying, pretreated carbon nanotubes were obtained. Then, according to the ratio of pretreated carbon nanotubes, hydroxylamine sulfate, sodium ethoxide, ethyl acetate and ethanol 10 g: 16 g: 24 g: 31 mL: 130 mL, pretreated carbon nanotubes and hydroxylamine sulfate were added to a reactor. Under stirring conditions, an ethanol solution containing sodium ethoxide was added dropwise to the reactor at 2 g / min, and then ethyl acetate was added dropwise at 0.4 g / min. After the addition was completed, the reaction was stirred for 1.5 h. Then, the pH value was adjusted to 6 using 2 mol / L sulfuric acid solution, and the carbon nanotube-acetyloxyoxime complex was obtained. (2) The carbon nanotube-acetyloxyoxime complex and polyacrylamide were stirred at 1200 rpm for 10 min at a mass ratio of 1:10 to obtain a flocculant. The scanning electron microscope image of the flocculant is shown below. Figure 1 As shown.

[0024] Preparation Example 2 Preparation Example 2 provides a flocculant prepared by the following process: (1) Carbon nanotubes were added to a mixed acid consisting of concentrated sulfuric acid (98wt%) and concentrated nitric acid (65wt%) according to the ratio of carbon nanotubes to concentrated sulfuric acid and concentrated nitric acid 1 g: 240 mL: 80 mL. The mixture was ultrasonically dispersed for 20 min and then stirred at 70 °C for 30 h. After separation, washing and drying, pretreated carbon nanotubes were obtained. Then, according to the ratio of pretreated carbon nanotubes, hydroxylamine sulfate, sodium ethoxide, ethyl acetate and ethanol 10 g: 15 g: 12 g: 30 mL: 120 mL, pretreated carbon nanotubes and hydroxylamine sulfate were added to a reactor. Under stirring conditions, an ethanol solution containing sodium ethoxide was added dropwise to the reactor at 2 g / min, and then ethyl acetate was added dropwise at 0.4 g / min. After the addition was completed, the reaction was stirred for 1 h. The pH value was then adjusted to 6.5 using 1 mol / L sulfuric acid solution. The carbon nanotube-acetyloxyoxime complex was then separated. (2) The carbon nanotube-acetoxyoxime complex and polyacrylamide were stirred at 1000 rpm for 12 min according to a mass ratio of 1:8 to obtain a flocculant.

[0025] Preparation Example 3 Preparation Example 3 provides a flocculant prepared by the following process: (1) Carbon nanotubes were added to a mixed acid consisting of concentrated sulfuric acid (98 wt%) and concentrated nitric acid (65 wt%) according to the ratio of carbon nanotubes to concentrated sulfuric acid and concentrated nitric acid 1 g: 270 mL: 90 mL. The mixture was ultrasonically dispersed for 40 min and then stirred at 80 °C for 20 h. After separation, washing and drying, pretreated carbon nanotubes were obtained. Then, according to the ratio of pretreated carbon nanotubes, hydroxylamine sulfate, sodium ethoxide, ethyl acetate and ethanol 10 g: 17 g: 35 g: 32 mL: 150 mL, pretreated carbon nanotubes and hydroxylamine sulfate were added to a reactor. Under stirring conditions, an ethanol solution containing sodium ethoxide was added dropwise to the reactor at 2 g / min, and then ethyl acetate was added dropwise at 0.4 g / min. After the addition was completed, the reaction was stirred for 2 h. The pH value was then adjusted to 5.5 using 2 mol / L sulfuric acid solution. The carbon nanotube-acetoxyoxime complex was then separated. (2) The carbon nanotube-acetoxyoxime complex and polyacrylamide were stirred at 1200 rpm for 8 min according to the mass ratio of carbon nanotube-acetoxyoxime complex to polyacrylamide of 1:12 to obtain flocculant.

[0026] Preparation Example 4 Preparation Example 4 provides a flocculant prepared by the following process: The carbon nanotubes and polyacrylamide were stirred at 1200 rpm for 10 min at a mass ratio of 1:10 to obtain a flocculant.

[0027] Preparation Example 5 Preparation Example 5 provides a coagulant aid, prepared by the following process: Following a ratio of 10 g: 4 g: 1.5 g: 35 mL for polyaluminum chloride, magnesium oxide, samarium oxide, and dilute hydrochloric acid solution, polyaluminum chloride was added to a 20% dilute hydrochloric acid solution, followed by magnesium oxide and samarium oxide. The mixture was stirred at 55 °C for 3 h, cooled, and allowed to stand for 15 h. The supernatant was then evaporated and dried to obtain the coagulant aid. A scanning electron microscope image of the coagulant aid is shown below. Figure 2 As shown.

[0028] Preparation Example 6 Preparation Example 6 provides a coagulant aid, prepared by the following process: Weigh the raw materials according to the ratio of polyaluminum chloride, magnesium oxide, samarium oxide and dilute hydrochloric acid solution as 10 g: 3 g: 1 g: 20 mL, and set aside. Add polyaluminum chloride to a dilute hydrochloric acid solution with a concentration of 18%, then add magnesium oxide and samarium oxide, stir and react at 50°C for 2 h, cool and let stand for 10 h, take the supernatant, evaporate and dry to obtain the coagulant aid.

[0029] Preparation Example 7 Preparation Example 7 provides a coagulant aid, prepared by the following process: Weigh the raw materials according to the ratio of polyaluminum chloride, magnesium oxide, samarium oxide and dilute hydrochloric acid solution as 10 g: 5 g: 2 g: 50 mL, and set aside. Add polyaluminum chloride to a 22% dilute hydrochloric acid solution, then add magnesium oxide and samarium oxide, stir and react at 60℃ for 4 h, cool and let stand for 20 h, take the supernatant, evaporate and dry to obtain the coagulant aid.

[0030] Preparation Example 8 Preparation Example 8 is basically the same as Preparation Example 5, except that samarium oxide is omitted in Preparation Example 5.

[0031] (II) Implementation Examples Example 1 Example 1 provides a reagent for treating mineral processing wastewater, comprising the following components in parts by weight: 10 parts of flocculant from Preparation Example 1, 15 parts of coagulant aid from Preparation Example 5, 10 parts of sucrose fatty acid ester, 12 parts of sodium lauryl ester, 2 parts of pine oil, 12 parts of starch, and 25 parts of water.

[0032] The preparation method of the above-mentioned agent is as follows: flocculant, coagulant aid, sucrose fatty acid ester, sodium lauryl ester, pine oil, starch and water are mixed and stirred in proportion to obtain the agent.

[0033] Example 2 Example 2 provides a reagent for treating mineral processing wastewater, comprising the following components in parts by weight: 5 parts of flocculant from Preparation Example 2, 10 parts of coagulant aid from Preparation Example 6, 8 parts of sucrose fatty acid ester, 10 parts of sodium lauryl ester, 1 part of pine oil, 10 parts of starch, and 20 parts of water.

[0034] The preparation method is the same as in Example 1.

[0035] Example 3 Example 3 provides a reagent for treating mineral processing wastewater, comprising the following components in parts by weight: 15 parts of flocculant from Preparation Example 3, 20 parts of coagulant aid from Preparation Example 7, 12 parts of sucrose fatty acid ester, 15 parts of sodium lauryl ester, 3 parts of pine oil, 15 parts of starch, and 30 parts of water.

[0036] The preparation method is the same as in Example 1.

[0037] (III) Comparative Example Comparative Example 1 Comparative Example 1 is basically the same as Example 1, except that the flocculant in Example 1 is replaced with polyacrylamide.

[0038] Comparative Example 2 Comparative Example 2 is basically the same as Example 1, except that the flocculant in Example 1 is replaced with the flocculant in Preparation Example 4.

[0039] Comparative Example 3 Comparative Example 3 is basically the same as Example 1, except that the coagulant in Example 1 is replaced with the coagulant in Preparation Example 8.

[0040] (iv) Test Examples The mineral processing wastewater treatment agents prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests.

[0041] Preparation of simulated weakly acidic mineral processing wastewater (containing Pb) 2+ 50 mg / L, Cu 2+ 30 mg / L, diatomaceous earth was selected as the suspended solids, and sodium dodecyl sulfate was selected as the source of organic matter in the wastewater. The reagent was added at a ratio of 1 g per liter of wastewater. After stirring, flocculation and sedimentation, the removal rate of each pollutant in the supernatant was calculated.

[0042] Ion removal rate: The residual Pb in the supernatant was determined by atomic absorption spectrophotometry. 2+ and Cu 2+ The concentration of each ion was used to calculate the removal rate of each ion according to the following formula: Ion removal rate (%) = (initial concentration - residual concentration) / initial concentration × 100%. The results are shown in Table 1.

[0043] Organic pollutant (COD) removal test: According to GB / T 11914-2021 "Determination of Chemical Oxygen Demand in Water", the COD of wastewater before and after treatment was tested, and the COD removal rate (%) was calculated as (initial COD concentration - residual COD concentration) / initial COD concentration × 100%. The results are shown in Table 1.

[0044] Suspended solids (SS) removal test: According to GB / T 11901-1989 "Determination of suspended solids in water by gravimetric method", the concentration of suspended solids in wastewater before and after treatment was tested, and the SS removal rate (%) was calculated as (initial SS concentration - residual SS concentration) / initial SS concentration × 100%. The results are shown in Table 1.

[0045] Table 1. Test results of the reagents on the removal rates of ions, COD, and SS in wastewater. As shown in Table 1, the mineral processing wastewater treatment agents prepared in Examples 1-3 of this invention achieve efficient and stable removal of heavy metal ions, COD, and suspended solids.

[0046] Compared to Example 1, Comparative Example 1, which used ordinary polyacrylamide instead of the flocculant of this invention, showed a significant decrease in the removal rate of heavy metal ions, and a marked deterioration in the removal efficiency of COD and SS. This indicates that the present invention modifies polyacrylamide by doping it with a carbon nanotube-acetyloxyoxime acid complex. The hollow tubular structure and large specific surface area of ​​the carbon nanotubes provide abundant physical adsorption sites, while the strong complexing ability of acetyloxyoxime acid enables specific chemical adsorption of dissolved heavy metal ions. The synergistic effect of the two significantly improves the flocculant's ability to remove complex pollutants; pure polyacrylamide, relying solely on bridging flocculation, cannot effectively capture ionic pollutants.

[0047] Comparative Example 2 replaced the carbon nanotube-acetyloxyoxime acid complex with unmodified raw carbon nanotubes and physically mixed with polyacrylamide. Although the removal rates were slightly higher than those in Comparative Example 1, they were still significantly lower than those in Example 1. This indicates that the absence of acetyloxyoxime acid leads to a lack of specific complexing functional groups on the surface of carbon nanotubes, resulting in insufficient adsorption capacity for heavy metal ions. Simultaneously, the untreated carbon nanotubes exhibited poor dispersion in the system, failing to fully utilize their adsorption potential. This further confirms the crucial role of acetyloxyoxime acid composite modification in enhancing the functionalization and dispersion stability of carbon nanotubes in this invention.

[0048] Comparative Example 3 used undoped polyaluminum magnesium chloride (i.e., omitting samarium) as a coagulant aid, resulting in a significant decrease in both SS and COD removal rates. This indicates that samarium ion doping has a decisive impact on the flocculation performance of the coagulant aid. Specifically, samarium, as a high-charge-density rare earth ion, copolymerizes with aluminum and magnesium ions, giving the coagulant a higher surface positive charge density and a more developed three-dimensional network structure. This significantly enhances the charge neutralization and destabilization effect, resulting in denser flocs and faster settling rates, thereby greatly improving the SS removal rate. On the other hand, samarium ions themselves have a good adsorption and complexation effect on residual organic reagents and heavy metal ions in wastewater. Their absence weakens the coagulant aid's synergistic removal capacity for dissolved pollutants, thus affecting the COD reduction effect.

[0049] In summary, this invention utilizes carbon nanotube-acetyloxyoxime acid complex-modified polyacrylamide as an organic flocculant, combined with samarium-doped polyaluminum magnesium chloride inorganic coagulant, to fully leverage multiple synergistic mechanisms such as physical adsorption and chemical complexation. This achieves simultaneous and efficient removal of suspended solids, heavy metal ions, and organic pollutants from mineral processing wastewater, which is superior to the single or simple composite solutions of existing technologies.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. The basic principles and main features of the present invention have been described above with specific implementation schemes. Based on the present invention, some modifications or substitutions can be made, but these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of protection claimed by the present invention.

Claims

1. A reagent for treating mineral processing wastewater, characterized in that, The agent comprises the following components in parts by weight: 5-15 parts flocculant, 10-20 parts coagulant aid, 8-12 parts nonionic surfactant, 10-15 parts anionic surfactant, 1-3 parts foaming agent, 10-15 parts starch, and 20-30 parts water. The preparation method of the flocculant includes the following steps: (1) Add an ethanol solution containing sodium ethoxide to the mixture of pretreated carbon nanotubes and hydroxylamine sulfate, then add ethyl acetate and stir. Adjust the pH to 5.5-6.5 and separate to obtain carbon nanotube-acetoxyoxime complex. (2) The carbon nanotube-acetoxyoxime complex was mixed with polyacrylamide to obtain a flocculant.

2. The reagent for treating mineral processing wastewater according to claim 1, characterized in that, In step (1), the ratio of the amount of pretreated carbon nanotubes, hydroxylamine sulfate, sodium ethoxide, ethyl acetate and ethanol is 10 g: (15-17) g: (12-35) g: (30-32) mL: (120-150) mL; the pH is adjusted using a 1-2 mol / L sulfuric acid solution; the stirring time is 1-2 h.

3. The reagent for treating mineral processing wastewater according to claim 1, characterized in that, In step (2), the mass ratio of the carbon nanotube-acetoxyoxime complex to polyacrylamide is 1:(8-12); the stirring speed is 1000-1200 rpm and the time is 8-12 min.

4. The reagent for treating mineral processing wastewater according to claim 2, characterized in that, The pretreated carbon nanotubes are obtained by adding carbon nanotubes to a mixed acid of concentrated sulfuric acid and concentrated nitric acid, ultrasonically dispersing, stirring, separating, washing, and drying.

5. The reagent for treating mineral processing wastewater according to claim 4, characterized in that, The ratio of carbon nanotubes, concentrated sulfuric acid, and concentrated nitric acid is 1 g:(240-270) mL:(80-90) mL; the ultrasonic dispersion time is 20-40 min; the stirring treatment temperature is 70-80 ℃ and the time is 20-30 h.

6. The reagent for treating mineral processing wastewater according to claim 1, characterized in that, The preparation method of the coagulant includes the following steps: Polyaluminum chloride was added to a dilute hydrochloric acid solution, followed by magnesium oxide and samarium oxide. The mixture was heated to react, cooled and allowed to stand, and the supernatant was collected and evaporated to dry, thus obtaining the coagulant aid.

7. The reagent for treating mineral processing wastewater according to claim 6, characterized in that, The ratio of polyaluminum chloride, magnesium oxide, samarium oxide and dilute hydrochloric acid solution is 10 g: (3-5) g: (1-2) g: (20-50) mL; the concentration of dilute hydrochloric acid is 18-22 wt%.

8. The reagent for treating mineral processing wastewater according to claim 6, characterized in that, The heating reaction is carried out at a temperature of 50-60 ℃ for 2-4 h; the cooling and settling time is 10-20 h.

9. The reagent for treating mineral processing wastewater according to claim 1, characterized in that, The nonionic surfactant is sucrose fatty acid ester; the anionic surfactant is sodium lauryl ester; and the foaming agent is pine oil.

10. A method for preparing a reagent for treating mineral processing wastewater according to any one of claims 1-9, characterized in that, Includes the following steps: The flocculant, coagulant aid, nonionic surfactant, anionic surfactant, foaming agent, starch and water are mixed and stirred in a certain proportion to obtain the agent for treating mineral processing wastewater.

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