A tailing pond wastewater treatment agent, a preparation method and application thereof

Abstract

This invention discloses a tailings dam wastewater treatment agent, its preparation method, and its application. The agent comprises the following raw materials: lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, sorghum straw cellulose powder, corn oligopeptides, aminoethylaminopropyltrimethoxysilane, and water. The agent is prepared by mixing sorghum straw cellulose powder with lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptides, aminoethylaminopropyltrimethoxysilane, and water, followed by filtration to obtain a precipitate. The precipitate is then washed with ethanol, vacuum dried, and pulverized. Using the method of this invention, the turbidity removal rate and heavy metal ion removal rate of tailings dam wastewater both reach over 99%, meeting the requirements for widespread application.

Description

Technical Field

[0001] This invention belongs to the field of tailings dam wastewater treatment technology, specifically relating to a tailings dam wastewater treatment agent, its preparation method, and its application. Background Technology

[0002] The tailings in the Lutang tailings dam originate from the Bali beneficiation plant, the Changpo production area (formerly the Changpo beneficiation plant), and the Shaping beneficiation plant. It is the only tailings dam currently in use by the companies operating on the mountain. The wastewater discharged from the tailings dam is the production tailings from the beneficiation plants. The safe operation of the tailings dam is crucial to the continuity of production for the companies on the mountain. Based on the Lutang tailings dam wastewater deep treatment project (Phase I), and to address the insufficient design capacity and operational stability of Phase I, and considering the trial operation of the φ25m deep cone thickening tank wastewater treatment system for dry tailings piles, the Lutang tailings dam wastewater deep treatment project is now operating normally. This achieves deep treatment of the wastewater from the tailings dam, ensuring that the wastewater quality meets the latest environmental emission standards set by the local government. Mineral processing wastewater generally contains suspended solids and heavy metals. Currently, the reagents used in the Lutang tailings dam mainly include 98% soda ash, lime, polyacrylamide, ferric chloride, and polyaluminum chloride. The composition of the reagents used in mineral processing wastewater is complex, primarily determined by the properties of the ore and the reagent formulation. According to statistics, as of September, the drainage volume of Lutang was 3,371,253 cubic meters. 3 The price is 6.75 yuan, so the cost of treating the wastewater is 3,371,253 * 6.75 = 22,756,000 yuan; the total consumption of reagents is 2,694.72 tons, and the average unit price of reagents is 2,629.57 yuan / ton, so the total cost of reagents is 2,694.72 * 2,629.57 = 7,086,000 yuan, and the total operating cost is 29,842,000 yuan (see Table 1). As of September, 1,388 tons of soda ash reagents have been consumed, with an average unit price of 2,885.07 yuan / ton, so the cost of soda ash reagents is 1,388 * 2,885.07 = 4,004,500 yuan. (See Table 2) With the large amount of reagents used, high labor intensity, and high reagent costs, based on the principles of "ensuring safety and environmental protection, prioritizing service, reducing costs and increasing efficiency, and improving quality and benefits", we plan to conduct experimental research on reagent substitution for the treatment of Lutang tailings dam, in order to solve the problem of high reagent costs in Lutang tailings dam and maximize economic benefits.

[0003] Table 1

[0004]

[0005] Table 2

[0006]

[0007] Chinese patent application document (publication number: CN 116440884A) discloses a lead / copper-containing mining acidic wastewater treatment agent, its preparation method, and its application. It directly utilizes bauxite tailings, eliminating the need for grinding and impurity removal. The mining acidic wastewater treatment agent with heavy metal adsorption capacity can be obtained in just two steps: "activation roasting - alkaline synthesis". This invention has a short production process, requires less equipment, materials, and labor, and has a low overall cost. It can also achieve "waste treatment", and has broad industrial application prospects. However, the turbidity removal rate obtained by using the wastewater treatment agent prepared by this invention to treat tailings pond wastewater is only 87.54%, which still cannot meet the application requirements. Summary of the Invention

[0008] To address the problems of high usage costs of existing tailings dam agents and low turbidity removal rates achieved by existing wastewater treatment agents for tailings dam wastewater, this invention provides a tailings dam wastewater treatment agent, its preparation method, and its application.

[0009] To solve the above technical problems, the present invention adopts the following technical solution:

[0010] A tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 10-16 parts lime, 4-7 parts polyacrylamide, 12-20 parts ferric chloride, 64-80 parts polyaluminum chloride, 5-8 parts magnesium lignosulfonate, 9-14 parts sorghum straw cellulose powder, 1.4-3 parts corn oligopeptides, 0.8-1.3 parts aminoethylaminopropyltrimethoxysilane, and 120-150 parts water.

[0011] Preferably, the tailings pond wastewater treatment agent comprises, by weight, the following raw materials: 14 parts lime, 5 parts polyacrylamide, 15 parts ferric chloride, 75 parts polyaluminum chloride, 6 parts magnesium lignosulfonate, 12 parts sorghum straw cellulose powder, 2.3 parts corn oligopeptide, 1 part aminoethylaminopropyltrimethoxysilane, and 140 parts water.

[0012] This invention also provides a method for preparing a wastewater treatment agent for tailings ponds, comprising the following steps:

[0013] (1) Dry the sorghum stalks and then crush them. Pass the crushed sorghum stalks through a 200-300 mesh sieve to obtain sorghum stalk crushed material.

[0014] (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 32%-35%, control the pH value, and then stir to obtain a sorghum straw solution.

[0015] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0016] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3), stir, filter to obtain precipitate, wash the precipitate with ethanol, dry it under vacuum and then crush it to 500 mesh or more to obtain tailings pond wastewater treatment agent.

[0017] Preferably, in step (1), the sorghum stalks are dried to a moisture content of 1%-1.5% and then crushed.

[0018] Preferably, in step (2), the pH value is controlled to be 8.4-9, and then the mixture is stirred for 1.2-1.7 hours at a temperature of 63-68℃, a microwave power of 200-300W, and a rotation speed of 150-250r / min to obtain a sorghum straw solution.

[0019] Preferably, the stirring conditions in step (4) are: stirring at a temperature of 60-65℃, a microwave power of 250-350W, and a rotation speed of 400-500r / min for 1.5-2.5h.

[0020] Preferably, the precipitate obtained in step (4) is washed with ethanol 2-3 times.

[0021] Preferably, in step (4), the product is vacuum dried at 75-80°C.

[0022] The present invention also provides an application of a tailings pond wastewater treatment agent in the treatment of tailings pond wastewater, comprising the following steps: adding the tailings pond wastewater treatment agent to the tailings pond wastewater and adsorbing it at 30-34℃ for 35-45 minutes.

[0023] Preferably, the dosage of the wastewater treatment agent for the tailings pond is 6-8 g / L.

[0024] Compared with the prior art, the present invention has the following technical advantages:

[0025] 1. Using the method of the present invention, the turbidity removal rate of tailings pond wastewater reaches over 99.13%, and the lead ion removal rate of tailings pond wastewater reaches over 99.18%, which can meet the application requirements.

[0026] 2. The turbidity removal rate of tailings pond wastewater obtained by the present invention is significantly higher than that obtained by the prior art, which shows that the present invention has significant progress.

[0027] 3. The present invention, through the synergistic combination of sorghum straw cellulose powder, magnesium lignosulfonate, corn oligopeptides, and aminoethylaminopropyltrimethoxysilane, can synergistically improve the turbidity removal rate and lead ion removal rate of tailings pond wastewater, achieving unexpected technical effects.

[0028] 4. With increasingly stringent national standards for the treatment and discharge of mineral processing wastewater, greater emphasis is placed on low cost and ease of operation. This invention conducts experimental research on reagent substitution for tailings pond wastewater treatment in Lutang. Based on the analysis of the water quality composition of Lutang tailings pond, experimental research is conducted on alternative reagents to ensure that the wastewater discharged from the tailings pond meets the discharge limits. Based on the actual water quality conditions on site, the formulation and formulation of the alternative reagents are optimized and improved. Finally, the following formula for tailings pond wastewater treatment reagents is developed: by weight, it includes the following raw materials: 10-16 parts lime, 4-7 parts polyacrylamide. The reagent formula consists of 12-20 parts ferric chloride, 64-80 parts polyaluminum chloride, 5-8 parts magnesium lignosulfonate, 9-14 parts sorghum straw cellulose powder, 1.4-3 parts corn oligopeptides, 0.8-1.3 parts aminoethylaminopropyltrimethoxysilane, and 120-150 parts water. Using this reagent formula eliminates the need for 98% soda ash. This optimizes reagent preparation and management in the Lutang tailings dam, reduces reagent usage, lowers reagent costs, and reduces labor intensity. Furthermore, it provides a basis for exploring the feasibility of reagent substitution experiments in production, aiding in project decision-making and progress. Detailed Implementation

[0029] In an embodiment of the present invention, a tailings dam wastewater treatment agent comprises, by weight, the following raw materials: 10-16 parts lime, 4-7 parts polyacrylamide, 12-20 parts ferric chloride, 64-80 parts polyaluminum chloride, 5-8 parts magnesium lignosulfonate, 9-14 parts sorghum straw cellulose powder, 1.4-3 parts corn oligopeptides, 0.8-1.3 parts aminoethylaminopropyltrimethoxysilane, and 120-150 parts water.

[0030] The preparation method of the tailings dam wastewater treatment agent includes the following steps:

[0031] (1) Dry the sorghum stalks to a moisture content of 1%-1.5% and then crush them. Pass the crushed sorghum stalks through a 200-300 mesh sieve to obtain sorghum stalk crushed material.

[0032] (2) Add the sorghum straw pulverized material obtained in step (1) to a KOH solution with a mass concentration of 32%-35%, control the pH value to 8.4-9, and then stir for 1.2-1.7h at a temperature of 63-68℃, a microwave power of 200-300W, and a rotation speed of 150-250r / min to obtain a sorghum straw solution.

[0033] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0034] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3). Stir for 1.5-2.5 hours at a temperature of 60-65℃, a microwave power of 250-350W and a rotation speed of 400-500r / min. Then filter to obtain a precipitate. Wash the precipitate with ethanol 2-3 times, dry it under vacuum at 75-80℃ and then pulverize it to a mesh size of 500 or higher to obtain a tailings pond wastewater treatment agent.

[0035] The application of tailings dam wastewater treatment agents in the treatment of tailings dam wastewater includes the following steps: adding tailings dam wastewater treatment agents to tailings dam wastewater, wherein the addition amount of tailings dam wastewater treatment agents is 6-8 g / L, and adsorption is carried out at 30-34℃ for 35-45 min.

[0036] To make the present invention more fully disclosed, more specific embodiments are described below.

[0037] Example 1

[0038] A tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 11 parts lime, 4 parts polyacrylamide, 13 parts ferric chloride, 65 parts polyaluminum chloride, 5 parts magnesium lignosulfonate, 9 parts sorghum straw cellulose powder, 1.5 parts corn oligopeptide, 0.8 parts aminoethylaminopropyltrimethoxysilane, and 122 parts water.

[0039] The preparation method of the tailings dam wastewater treatment agent includes the following steps:

[0040] (1) Dry the sorghum stalks to a moisture content of 1.5% and then crush them. Pass the crushed sorghum stalks through a 200-mesh sieve to obtain sorghum stalk crushed material.

[0041] (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 32%, control the pH value to 8.5, and then stir for 1.7 h at a temperature of 63℃, a microwave power of 200W, and a rotation speed of 150r / min to obtain a sorghum straw solution.

[0042] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0043] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3). Stir for 2.5 h at a temperature of 60℃, microwave power of 250W and rotation speed of 400r / min. Then filter to obtain a precipitate. Wash the precipitate twice with ethanol, dry it under vacuum at 76℃ and then pulverize it to 500 mesh to obtain a tailings pond wastewater treatment agent.

[0044] The application of tailings dam wastewater treatment agent in the treatment of tailings dam wastewater includes the following steps: adding the tailings dam wastewater treatment agent to the tailings dam wastewater at a dosage of 6.2 g / L, and adsorbing at 30°C for 45 min.

[0045] Example 2

[0046] A tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 12 parts lime, 5 parts polyacrylamide, 13 parts ferric chloride, 66 parts polyaluminum chloride, 6 parts magnesium lignosulfonate, 10 parts sorghum straw cellulose powder, 1.6 parts corn oligopeptides, 0.8 parts aminoethylaminopropyltrimethoxysilane, and 125 parts water.

[0047] The preparation method of the tailings dam wastewater treatment agent includes the following steps:

[0048] (1) Dry the sorghum stalks to a moisture content of 1.1% and then crush them. Pass the crushed sorghum stalks through a 200-mesh sieve to obtain sorghum stalk crushed material.

[0049] (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 33%, control the pH value to 8.5, and then stir for 1.5 h at a temperature of 64℃, a microwave power of 200W, and a rotation speed of 200r / min to obtain a sorghum straw solution.

[0050] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0051] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3). Stir for 2 hours at a temperature of 62°C, a microwave power of 300W and a rotation speed of 400r / min. Then filter to obtain a precipitate. Wash the precipitate three times with ethanol, dry it under vacuum at 76°C and then pulverize it to 500 mesh to obtain a tailings pond wastewater treatment agent.

[0052] The application of tailings dam wastewater treatment agent in the treatment of tailings dam wastewater includes the following steps: adding the tailings dam wastewater treatment agent to the tailings dam wastewater at a dosage of 6.5 g / L, and adsorbing at 31°C for 44 min.

[0053] Example 3

[0054] A tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 13 parts lime, 6 parts polyacrylamide, 15 parts ferric chloride, 70 parts polyaluminum chloride, 6 parts magnesium lignosulfonate, 10 parts sorghum straw cellulose powder, 2 parts corn oligopeptides, 0.9 parts aminoethylaminopropyltrimethoxysilane, and 130 parts water.

[0055] The preparation method of the tailings dam wastewater treatment agent includes the following steps:

[0056] (1) Dry the sorghum stalks to a moisture content of 1.2% and then crush them. Pass the crushed sorghum stalks through a 300-mesh sieve to obtain sorghum stalk crushed material.

[0057] (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 33.2%, control the pH value to 8.6, and then stir for 1.6 h at a temperature of 67℃, a microwave power of 300W, and a rotation speed of 150r / min to obtain a sorghum straw solution.

[0058] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0059] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3). Stir for 2.2 h at a temperature of 62℃, microwave power of 250W and rotation speed of 400r / min. Then filter to obtain precipitate. Wash the precipitate twice with ethanol, dry it under vacuum at 78℃ and then pulverize it to 500 mesh to obtain the tailings pond wastewater treatment agent.

[0060] The application of tailings dam wastewater treatment agent in the treatment of tailings dam wastewater includes the following steps: adding the tailings dam wastewater treatment agent to the tailings dam wastewater at a dosage of 6.8 g / L, and adsorbing at 33℃ for 40 min.

[0061] Example 4

[0062] A tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 14 parts lime, 5 parts polyacrylamide, 15 parts ferric chloride, 75 parts polyaluminum chloride, 6 parts magnesium lignosulfonate, 12 parts sorghum straw cellulose powder, 2.3 parts corn oligopeptides, 1 part aminoethylaminopropyltrimethoxysilane, and 140 parts water.

[0063] The preparation method of the tailings dam wastewater treatment agent includes the following steps:

[0064] (1) Dry the sorghum stalks to a moisture content of 1.4% and then crush them. Pass the crushed sorghum stalks through a 300-mesh sieve to obtain sorghum stalk crushed material.

[0065] (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 34%, control the pH value to 8.7, and then stir for 1.5 h at a temperature of 66℃, a microwave power of 250W, and a rotation speed of 200r / min to obtain a sorghum straw solution.

[0066] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0067] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3). Stir for 2 hours at a temperature of 64°C, a microwave power of 300W and a rotation speed of 460r / min. Then filter to obtain a precipitate. Wash the precipitate three times with ethanol, dry it under vacuum at 78°C and then pulverize it to 500 mesh to obtain a tailings pond wastewater treatment agent.

[0068] The application of tailings dam wastewater treatment agent in the treatment of tailings dam wastewater includes the following steps: adding the tailings dam wastewater treatment agent to the tailings dam wastewater at a dosage of 7.2 g / L, and adsorbing at 32℃ for 42 min.

[0069] Example 5

[0070] A tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 16 parts lime, 5 parts polyacrylamide, 120 parts ferric chloride, 78 parts polyaluminum chloride, 8 parts magnesium lignosulfonate, 13 parts sorghum straw cellulose powder, 3 parts corn oligopeptides, 1.2 parts aminoethylaminopropyltrimethoxysilane, and 146 parts water.

[0071] The preparation method of the tailings dam wastewater treatment agent includes the following steps:

[0072] (1) Dry the sorghum stalks to a moisture content of 1.5% and then crush them. Pass the crushed sorghum stalks through a 300-mesh sieve to obtain sorghum stalk crushed material.

[0073] (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 35%, control the pH value to 8.6, and then stir for 1.2 h at a temperature of 68℃, a microwave power of 300W, and a rotation speed of 250r / min to obtain a sorghum straw solution.

[0074] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0075] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3). Stir for 1.5 h at a temperature of 65℃, microwave power of 350W and rotation speed of 500r / min. Then filter to obtain precipitate. Wash the precipitate twice with ethanol, dry it under vacuum at 76℃ and then pulverize it to 500 mesh to obtain the tailings pond wastewater treatment agent.

[0076] The application of tailings dam wastewater treatment agent in the treatment of tailings dam wastewater includes the following steps: adding the tailings dam wastewater treatment agent to the tailings dam wastewater at a dosage of 7.8 g / L, and adsorbing at 34℃ for 36 min.

[0077] Example 6

[0078] A tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 15 parts lime, 6 parts polyacrylamide, 18 parts ferric chloride, 75 parts polyaluminum chloride, 7 parts magnesium lignosulfonate, 12 parts sorghum straw cellulose powder, 2.5 parts corn oligopeptides, 1.1 parts aminoethylaminopropyltrimethoxysilane, and 140 parts water.

[0079] The preparation method of the tailings dam wastewater treatment agent includes the following steps:

[0080] (1) Dry the sorghum stalks to a moisture content of 1.2% and then crush them. Pass the crushed sorghum stalks through a 300-mesh sieve to obtain sorghum stalk crushed material.

[0081] (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 34%, control the pH value to 8.6, and then stir for 1.5 h at a temperature of 65℃, a microwave power of 200W, and a rotation speed of 250r / min to obtain a sorghum straw solution.

[0082] (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder.

[0083] (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3). Stir for 2 hours at a temperature of 63°C, a microwave power of 350W and a rotation speed of 400r / min. Then filter to obtain a precipitate. Wash the precipitate with ethanol 2-3 times, dry it under vacuum at 76°C and then pulverize it to 500 mesh to obtain a tailings pond wastewater treatment agent.

[0084] The application of tailings dam wastewater treatment agent in the treatment of tailings dam wastewater includes the following steps: adding the tailings dam wastewater treatment agent to the tailings dam wastewater at a dosage of 7.5 g / L, and adsorbing at 32℃ for 42 min.

[0085] Comparative Example 1

[0086] The tailings dam wastewater treatment agent, preparation method and application are basically the same as those in Example 4. The only difference is that the raw materials in step (4) of the preparation method of the tailings dam wastewater treatment agent are missing sorghum straw cellulose powder, magnesium lignosulfonate, corn oligopeptide and aminoethylaminopropyltrimethoxysilane. The missing sorghum straw cellulose powder, magnesium lignosulfonate, corn oligopeptide and aminoethylaminopropyltrimethoxysilane are replaced with pure water, which is equivalent to keeping the total amount of raw materials unchanged.

[0087] Comparative Example 2

[0088] The tailings pond wastewater treatment agent, preparation method and application are basically the same as those of Comparative Example 1. The only difference is that the raw materials in step (4) of the preparation method of the tailings pond wastewater treatment agent are increased by sorghum straw cellulose powder. The missing magnesium lignin sulfonate, corn oligopeptide and aminoethylaminopropyltrimethoxysilane are replaced by pure water, which is equivalent to keeping the total amount of raw materials unchanged.

[0089] Comparative Example 3

[0090] The tailings pond wastewater treatment agent, preparation method and application are basically the same as those of Comparative Example 1. The only difference is that the raw materials in step (4) of the preparation method of the tailings pond wastewater treatment agent are increased by magnesium lignosulfonate. The missing amounts of sorghum straw cellulose powder, corn oligopeptide and aminoethylaminopropyltrimethoxysilane are replaced by pure water, which is equivalent to keeping the total amount of raw materials unchanged.

[0091] Comparative Example 4

[0092] The tailings pond wastewater treatment agent, preparation method and application are basically the same as those of Comparative Example 1. The only difference is that the raw materials in step (4) of the preparation method of the tailings pond wastewater treatment agent are increased by corn oligopeptide. The missing sorghum straw cellulose powder, magnesium lignosulfonate and aminoethylaminopropyltrimethoxysilane are replaced by pure water, which is equivalent to keeping the total amount of raw materials unchanged.

[0093] Comparative Example 5

[0094] The tailings pond wastewater treatment agent, preparation method and application are basically the same as those of Comparative Example 1. The only difference is that the raw materials in step (4) of the preparation method of the tailings pond wastewater treatment agent are increased by aminoethylaminopropyltrimethoxysilane. The missing sorghum straw cellulose powder, magnesium lignin sulfonate and corn oligopeptide are replaced by pure water, which is equivalent to keeping the total amount of raw materials unchanged.

[0095] Comparative Example 6

[0096] The reagent was prepared using the method in Example 3 of the Chinese patent application document "A lead / copper mining acidic wastewater treatment agent and its preparation method and application (Publication No.: CN 116440884A)" and the method of this example was used to treat tailings pond wastewater.

[0097] The wastewater from the tailings pond was treated with the reagents prepared in Examples 1-6 and Comparative Examples 1-6. The turbidity removal rate of the wastewater was tested using a turbidity meter XZ-0101B produced by Shanghai Haiheng Electromechanical Instrument Co., Ltd., and the removal rate of heavy metal ions (lead ions) in the wastewater was tested using an atomic flame absorption spectrometer. The results are shown in Table 3 below.

[0098] Table 3

[0099]

[0100] As can be seen from Table 3 above: (1) From the data on the turbidity removal rate and lead ion removal rate of tailings pond wastewater in Examples 1-6, it can be seen that by using the method of the present invention, the turbidity removal rate of tailings pond wastewater reaches more than 99.13%, and the lead ion removal rate of tailings pond wastewater reaches more than 99.18%, which can meet the application requirements. Based on the above test data, it can be seen that Example 4 is the optimal example.

[0101] (2) As can be seen from the data on turbidity removal rate and lead ion removal rate of tailings pond wastewater in Examples 1-6 and Comparative Example 6 (Prior Art), the turbidity removal rate of tailings pond wastewater obtained in Examples 1-6 is significantly higher than that obtained in Comparative Example 6 by at least 13.24%; the lead ion removal rate of tailings pond wastewater obtained in Examples 1-6 is comparable to that obtained in Comparative Example 6. From the above comparison, it can be seen that the present invention has significant progress compared with the prior art.

[0102] (3) As can be seen from the data on turbidity removal rate and lead ion removal rate of tailings pond wastewater in Examples 4 and Comparative Examples 1-5, sorghum straw cellulose powder, magnesium lignosulfonate, corn oligopeptides, and aminoethylaminopropyltrimethoxysilane played a synergistic role in the preparation of tailings pond wastewater treatment agents, synergistically improving the turbidity removal rate and lead ion removal rate of tailings pond wastewater. This is because:

[0103] The cellulose in sorghum straw cellulose powder contains hydroxyl groups, which can chelate lead ions in tailings wastewater, exhibiting strong flocculation and adsorption capabilities, thereby improving the turbidity and lead ion removal rates of tailings wastewater. Magnesium lignosulfonate can contact the surface of particles in tailings wastewater, significantly reducing the affinity of the particle surface for water, effectively disrupting the original water structure on the particle surface, releasing surface moisture, and thus improving the turbidity removal rate. Corn oligopeptides complex with the cellulose in sorghum straw cellulose powder, enhancing the flocculation and lead ion adsorption capabilities of tailings wastewater treatment agents, thereby improving the turbidity and lead ion removal rates of tailings wastewater. Aminoethylaminopropyltrimethoxysilane can enhance the intermolecular stress of cellulose in corn oligopeptides and sorghum straw cellulose powder, thereby improving the dispersion ability of tailings dam wastewater treatment agents in wastewater, further increasing the flocculation speed, and improving the turbidity removal rate and lead ion removal rate of tailings dam wastewater. In summary, this invention, through the synergistic effect of sorghum straw cellulose powder, magnesium lignosulfonate, corn oligopeptides, and aminoethylaminopropyltrimethoxysilane, can synergistically improve the turbidity removal rate and lead ion removal rate of tailings dam wastewater, achieving unexpected technical effects.

[0104] The above content should not be construed as limiting the specific implementation of this invention to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of this invention, and all such deductions or substitutions should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. The application of a tailings dam wastewater treatment agent in the treatment of tailings dam wastewater, characterized in that, Includes the following steps: Add the tailings pond wastewater treatment agent to the tailings pond wastewater and adsorb it at 30-34℃ for 35-45 minutes. The amount of the tailings pond wastewater treatment agent added is 6-8 g / L. The tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 10-16 parts lime, 4-7 parts polyacrylamide, 12-20 parts ferric chloride, 64-80 parts polyaluminum chloride, 5-8 parts magnesium lignosulfonate, 9-14 parts sorghum straw cellulose powder, 1.4-3 parts corn oligopeptides, 0.8-1.3 parts aminoethylaminopropyltrimethoxysilane, and 120-150 parts water. The preparation method of the tailings dam wastewater treatment agent includes the following steps: (1) Dry the sorghum stalks and then crush them, and pass them through a 200-300 mesh sieve to obtain sorghum stalk crushed material; (2) Add the sorghum straw powder obtained in step (1) to a KOH solution with a mass concentration of 32%-35%, control the pH value, and then stir to obtain a sorghum straw solution; (3) Centrifuge and filter the sorghum straw solution obtained in step (2), then dry and grind it to obtain sorghum straw cellulose powder; (4) Add lime, polyacrylamide, ferric chloride, polyaluminum chloride, magnesium lignosulfonate, corn oligopeptide, aminoethylaminopropyltrimethoxysilane and water to the sorghum straw cellulose powder obtained in step (3), stir, then filter to obtain a precipitate, wash the precipitate with ethanol, dry it under vacuum at 75-80℃ and then pulverize it to more than 500 mesh to obtain a tailings pond wastewater treatment agent. Step (1) Dry the sorghum stalks until the moisture content is 1%-1.5% and then crush them; In step (2), the pH value is controlled to be 8.4-9, and then the mixture is stirred for 1.2-1.7h at a temperature of 63-68℃, a microwave power of 200-300W, and a rotation speed of 150-250r / min to obtain a sorghum straw solution. The stirring conditions in step (4) are as follows: stirring for 1.5-2.5 hours at a temperature of 60-65℃, a microwave power of 250-350W, and a rotation speed of 400-500r / min.

2. The application of the tailings dam wastewater treatment agent according to claim 1 in the treatment of tailings dam wastewater, characterized in that, The tailings dam wastewater treatment agent, by weight, comprises the following raw materials: 14 parts lime, 5 parts polyacrylamide, 15 parts ferric chloride, 75 parts polyaluminum chloride, 6 parts magnesium lignosulfonate, 12 parts sorghum straw cellulose powder, 2.3 parts corn oligopeptides, 1 part aminoethylaminopropyltrimethoxysilane, and 140 parts water.

3. The application of the tailings dam wastewater treatment agent according to claim 1 in the treatment of tailings dam wastewater, characterized in that, The precipitate obtained in step (4) is washed with ethanol 2-3 times.

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