Decoloring flocculant and preparation method thereof

Abstract

The invention discloses a decolorizing flocculant and a preparation method thereof, and belongs to the technical field of water treatment. The decolorizing flocculant disclosed by the invention is prepared from the following raw materials in parts by weight: 20 to 25 parts of ethidene diamine modified dicyandiamide formaldehyde, 12 to 15 parts of an aluminum-titanium-based polymer and 4 to 5 parts of a polyferric sulfate-polyacrylamide compound. The invention also discloses a preparation method of the decolorizing flocculant. The components of the decolorizing flocculant prepared by the invention can fully exert a synergistic effect, not only can realize rapid formation and sedimentation of flocs, reduce the dye content in high-chroma wastewater and greatly reduce chroma, and the decolorizing rate can reach 99.02% or above, but also the decolorizing flocculant has wide applicability, and is suitable for industrial production. Therefore, the flocculant can exert good decolorizing and flocculating effects in a water body with complex components.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a decolorizing flocculant and its preparation method. Background Technology

[0002] Oil and gas field development wastewater is typically characterized by high color intensity. High-color wastewater is difficult to degrade and poses a significant potential hazard to the environment and ecosystems. Currently, commonly used decolorization methods for high-color wastewater include flocculation, microbial degradation, photocatalytic degradation, electrochemical treatment, and ozonation. Among these, flocculation is considered the most important decolorization method, offering advantages such as ease of operation, high efficiency, low energy consumption, and low cost. It has been widely used in the pretreatment and primary treatment stages of high-color wastewater purification. Simply put, a certain amount of decolorizing flocculant is added to the water to adsorb dye molecules. After stirring and settling for a certain period, the lower layer of flocs is filtered out, yielding the supernatant, which is the effluent after effective dye removal.

[0003] However, high-chroma wastewater in actual production often contains complex components. For example, in the dyeing and printing industry, to improve the stability and color-fixing effect of the dye liquor, factories add inorganic salts and surfactants of varying quantities and types. These substances cause significant fluctuations in the anion concentration in the dye liquor, affecting the effectiveness of decolorizing flocculants. Therefore, obtaining a decolorizing flocculant that combines wide applicability with high adsorption efficiency has become a pressing issue. Summary of the Invention

[0004] The purpose of this invention is to provide a decolorizing flocculant and its preparation method, which solves the technical problem in the prior art of how to obtain a decolorizing flocculant that has both wide applicability and high adsorption capacity.

[0005] To achieve the above objectives, one embodiment of the present invention provides a decolorizing flocculant comprising the following raw materials in parts by weight:

[0006] 20-25 parts of ethylenediamine-modified dicyandiamide formaldehyde, 12-15 parts of aluminum-titanium-based polymer, and 4-5 parts of polyferric sulfate-polyacrylamide composite.

[0007] In one preferred embodiment of the present invention, the decolorizing flocculant comprises the following raw materials in parts by weight: 22-25 parts of ethylenediamine-modified dicyandiamide formaldehyde, 12-14 parts of aluminum-titanium-based polymer, and 4.5-5 parts of polyferric sulfate-polyacrylamide composite.

[0008] Based on the decolorizing flocculant disclosed in this invention, this invention also discloses a method for preparing the decolorizing flocculant, comprising the following steps: mixing ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium-based polymer and polyferric sulfate-polyacrylamide composite evenly to obtain the decolorizing flocculant.

[0009] One preferred embodiment of the present invention is a method for preparing ethylenediamine-modified dicyandiamide formaldehyde, comprising: mixing dicyandiamine, formaldehyde and half of the ammonium chloride, stirring and heating, adding the remaining ammonium chloride and continuing to heat and react, adding ethylenediamine dropwise to react, and cooling to obtain ethylenediamine-modified dicyandiamide formaldehyde.

[0010] In one preferred embodiment of the present invention, the mass ratio of dicyandiamide, formaldehyde, ammonium chloride and ethylenediamine is 1:0.8-0.82:0.5-0.52:0.07-0.09.

[0011] One preferred embodiment of the present invention is a method for preparing an aluminum-titanium-based polymer, comprising: dispersing aluminum trichloride and titanium tetrachloride in water at a molar ratio of 0.5-5:1, and performing an electrodialysis reaction to obtain the aluminum-titanium-based polymer.

[0012] In one preferred embodiment of the present invention, the molar ratio of aluminum trichloride to titanium tetrachloride is 0.8-1.5:1.

[0013] One preferred embodiment of the present invention is a method for preparing an aluminum-titanium-based polymer, comprising:

[0014] Preparation of titanium tetrachloride solution;

[0015] Preparation of aluminum trichloride solution;

[0016] After the prepared titanium tetrachloride solution and aluminum trichloride solution were mixed evenly, an electrodialysis reaction was carried out to obtain an aluminum-titanium based polymer.

[0017] One preferred embodiment of the present invention is to prepare a titanium tetrachloride solution by: slowly adding titanium tetrachloride dropwise into water, pausing the addition when white flocculent matter is produced in the water, and continuing the addition after the white flocculent matter disappears, while continuously stirring during the addition process, and continuing to stir after the titration is completed to obtain a titanium tetrachloride solution.

[0018] In one preferred embodiment of the present invention, the conditions for the electrodialysis reaction are: current intensity of 0.01A-0.02A and reaction time of 7h-9h.

[0019] One preferred embodiment of the present invention is a method for preparing a polyferric sulfate-polyacrylamide composite, comprising: mixing polyferric sulfate and polyacrylamide in a weight ratio of 1:0.5-3, grinding, until the color of the system no longer changes, to obtain the polyferric sulfate-polyacrylamide composite.

[0020] In one preferred embodiment of the present invention, the weight ratio of polyferric sulfate to polyacrylamide is 1:1-2.

[0021] In summary, the beneficial effects of the present invention are as follows:

[0022] 1. The decolorizing flocculant prepared by this invention exhibits excellent synergistic effects among its components, enabling rapid floc formation and sedimentation, reducing dye content in high-chroma wastewater, significantly lowering color, and achieving a decolorization rate of over 99.02%. Furthermore, this decolorizing flocculant has broad applicability, allowing it to perform well in complex water bodies. Experimental testing shows that the decolorizing flocculant of this application can maintain a decolorization rate of over 96% even with the addition of large amounts of inorganic salts and anionic surfactants.

[0023] 2. The preparation method of the decolorizing flocculant of the present invention is efficient and simple, and can quickly produce the decolorizing flocculant, which has high practical application value.

[0024] 3. The decolorizing flocculant of this invention uses ethylenediamine-modified dicyandiamide formaldehyde as its main component. Dicyandiamide formaldehyde has excellent dye decolorization ability, and ethylenediamine can further enhance the apparent density of the internal structure of dicyandiamide formaldehyde, thereby improving its decolorization effect. When the content of inorganic salts or surfactants in high-color wastewater increases, that is, when the number of anions in the water increases and competes with the negative charge of the dye for the cationic adsorption sites of the decolorizing flocculant, ethylenediamine-modified dicyandiamide formaldehyde still adsorbs a large amount of dye and exerts a good decolorization effect because it has a large amount of cationic charge.

[0025] 4. The aluminum-titanium-based polymer in the decolorizing flocculant of this invention can exert its highly efficient decolorizing and flocculating effect, accelerating floc formation, promoting rapid sedimentation, and increasing floc particle size. The polyferric sulfate-polyacrylamide composite, which also has a decolorizing and flocculating effect, has the ability to promote floc particle aggregation and further bonding of short molecular chain flocs. Therefore, the ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium-based polymer, and polyferric sulfate-polyacrylamide composite of this invention can fully exert their synergistic effect, not only achieving rapid floc formation and sedimentation, reducing the dye content in high-chroma wastewater, and significantly reducing color, but also achieving a decolorization rate of over 99.02%. Furthermore, the decolorizing flocculant of this application has wide applicability, enabling it to exert good decolorizing and flocculating effects even in water bodies with complex compositions. Tests have shown that the decolorizing flocculant of this application can still achieve a decolorization rate of over 95.11% and a decolorization retention rate of over 96% even with the addition of large amounts of inorganic salts and anionic surfactants.

[0026] 5. This invention also strictly controls the weight ratio between ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium polymer and polyferric sulfate-polyacrylamide composite, further optimizing the decolorization effect of the decolorizing flocculant. Experimental data show that the decolorization rate can reach 99.45% at this time.

[0027] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be appreciated by way of the effects described in the description. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The present invention provides a decolorizing flocculant comprising the following raw materials in parts by weight: 20-25 parts of ethylenediamine-modified dicyandiamide formaldehyde, 12-15 parts of aluminum-titanium-based polymer, and 4-5 parts of polyferric sulfate-polyacrylamide composite.

[0030] Preferably, the decolorizing flocculant comprises the following raw materials in parts by weight: 22-25 parts of ethylenediamine-modified dicyandiamide formaldehyde, 12-14 parts of aluminum-titanium-based polymer, and 4.5-5 parts of polyferric sulfate-polyacrylamide composite; preferably, the decolorizing flocculant comprises the following raw materials in parts by weight: 24 parts of ethylenediamine-modified dicyandiamide formaldehyde, 12 parts of aluminum-titanium-based polymer, and 4.8 parts of polyferric sulfate-polyacrylamide composite.

[0031] This invention strictly controls the weight ratio between ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium polymer and polyferric sulfate-polyacrylamide composite, further optimizing the decolorization effect of the decolorizing flocculant. Experimental data show that the decolorization rate can reach 99.45% at this time.

[0032] The present invention also provides a method for preparing a decolorizing flocculant, comprising the following steps: mixing ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium-based polymer and polyferric sulfate-polyacrylamide composite evenly to obtain a decolorizing flocculant;

[0033] The preparation method of ethylenediamine-modified dicyandiamide formaldehyde includes: mixing dicyandiamine, formaldehyde, and half of the ammonium chloride, stirring and heating, adding the remaining ammonium chloride and continuing to heat and react, adding ethylenediamine dropwise to react, and cooling to obtain ethylenediamine-modified dicyandiamide formaldehyde; specifically, mixing dicyandiamine, formaldehyde, and half of the ammonium chloride, heating under continuous stirring, then adding the remaining half of the ammonium chloride, continuing to heat and reacting for a period of time, adding ethylenediamine dropwise, reacting for another period of time, and cooling the resulting product to obtain ethylenediamine-modified dicyandiamide formaldehyde; wherein the mass ratio of dicyandiamine, formaldehyde, ammonium chloride, and ethylenediamine is 1:0.8-0.82:0.5-0.52:0.07-0.09;

[0034] A method for preparing an aluminum-titanium based polymer includes: dispersing aluminum trichloride and titanium tetrachloride in water at a molar ratio of 0.5-5:1, and performing an electrodialysis reaction to obtain the aluminum-titanium based polymer; preferably, the molar ratio of aluminum trichloride and titanium tetrachloride is 0.8-1.5:1; further, the molar ratio of aluminum trichloride and titanium tetrachloride is 1:1.

[0035] Specifically, the preparation methods of aluminum-titanium based polymers include:

[0036] Step (1): Preparation of titanium tetrachloride solution: Titanium tetrachloride is slowly added dropwise to water. When white flocs are formed in the water, the addition is stopped. After the white flocs disappear, the addition is continued. Stirring is continued during the addition process. Stirring is continued after the titration is completed to obtain titanium tetrachloride solution.

[0037] Step (2): Preparation of aluminum chloride solution: Aluminum chloride is mixed with water to obtain aluminum chloride solution;

[0038] Step (3): After the prepared titanium tetrachloride solution and aluminum trichloride solution are mixed evenly, an electrodialysis reaction is carried out to obtain an aluminum titanium-based polymer; specifically, the titanium tetrachloride solution and aluminum trichloride solution are mixed evenly at a weight ratio of 1:1, so that the molar ratio of aluminum trichloride to titanium tetrachloride in the mixture is (0.5-5):1, and an electrodialysis reaction time of 0.01A-0.02A is carried out under the condition of current intensity of 0.01A-0.02A to obtain an aluminum titanium-based polymer;

[0039] This invention uses an aluminum-titanium based polymer obtained by electrodialysis of titanium and iron as a component of a decolorizing flocculant. It not only has a highly efficient decolorizing and flocculating effect, but also has advantages such as rapid floc formation and settling speed, large flocs, and no biological toxicity. Its decolorizing and flocculating effect is far superior to that of using aluminum salt flocculants or titanium salt flocculants alone.

[0040] Furthermore, this invention optimizes the flocculation ability of aluminum-titanium based polymers by gradually controlling the molar ratio of aluminum trichloride and titanium tetrachloride, thereby obtaining aluminum-titanium based polymers with different aluminum / titanium molar ratios. Experimental data show that when the molar ratio of aluminum trichloride to titanium tetrachloride is (0.8-1.5):1, the decolorization rate of the decolorizing flocculant is not less than 99.26%, and when the molar ratio of aluminum trichloride to titanium tetrachloride is 1:1, the decolorization rate of the decolorizing flocculant can reach 99.32%.

[0041] A method for preparing a polyferric sulfate-polyacrylamide composite includes: mixing polyferric sulfate and polyacrylamide in a weight ratio of 1:0.5-3, grinding, until the color of the system no longer changes, to obtain the polyferric sulfate-polyacrylamide composite;

[0042] Preferably, the weight ratio of polyferric sulfate to polyacrylamide is 1:1-2.

[0043] This invention involves mixing polyferric sulfate and polyacrylamide in a certain weight ratio and then grinding them. During the grinding process, intermolecular interactions occur, causing the crystallinity of polyacrylamide to decrease and tend towards an amorphous structure. Ionic bonds are formed between polyferric sulfate and polyacrylamide, ultimately yielding a polyferric sulfate-polyacrylamide composite. This substance has good charge neutralization and adsorption / trapping capabilities, enabling it to efficiently adsorb dyes, form flocs, and promote the aggregation of floc particles and the further binding of short molecular chain flocs.

[0044] Furthermore, this application optimizes the flocculation ability of the polyferric sulfate-polyacrylamide composite by strictly controlling the weight ratio of polyferric sulfate to polyacrylamide. Experimental data demonstrate that when the weight ratio of polyferric sulfate to polyacrylamide is 1:(1-2), the decolorization rate of the decolorizing flocculant is not less than 99.24%.

[0045] Example

[0046] Material source: Unless otherwise specified, all raw materials used in this invention are commercially available products, specifically:

[0047] Dicyandiamide was purchased from Tianjin Fengchuan Chemical Reagent Technology Co., Ltd., CAS No. 461-58-5;

[0048] Formaldehyde was purchased from Tianjin Kemeo Chemical Reagent Co., Ltd.

[0049] Ammonium chloride was purchased from Tianjin Kemeo Chemical Reagent Co., Ltd.

[0050] Ethylenediamine was purchased from Tianjin Kemeo Chemical Reagent Co., Ltd.

[0051] Titanium tetrachloride was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0052] Aluminum trichloride was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0053] Polyferric sulfate was purchased from Henan Hongchang Chemical Co., Ltd.

[0054] Polyacrylamide was purchased from Tianjin Kemeo Chemical Reagent Co., Ltd.

[0055] Dicyandiamide formaldehyde was purchased from Wuxi Lanbo Chemicals Co., Ltd., CAS No. 55295-98-2;

[0056] Polyaluminum chloride was purchased from Gongyi Taiyu Water Purification Materials Co., Ltd.

[0057] Polytitanium chloride was purchased from Pande International Trading Co., Ltd.

[0058] Several preparation examples are provided, which are the preparation methods of ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium-based polymer and polyferric sulfate-polyacrylamide composite.

[0059] Preparation Example 1: A method for preparing ethylenediamine-modified dicyandiamide formaldehyde, comprising the following steps:

[0060] 8.4 kg of dicyandiamide, 6.75 kg of formaldehyde, and 2.14 kg of ammonium chloride were sequentially placed into a three-necked flask equipped with a reflux condenser and a thermometer. Cooling water was circulated, and a constant-temperature magnetic stirrer was turned on. The temperature was gradually increased under continuous stirring. Heating was stopped when the temperature reached 50°C. After 30 minutes, 2.14 kg of ammonium chloride was added, and the temperature was then raised to 80°C. After reacting for 20 minutes, 0.6 kg of ethylenediamine was added dropwise. The temperature was maintained at 80°C, and the reaction was continued for another 30 minutes before the reaction was stopped. The resulting product was cooled to room temperature to obtain ethylenediamine-modified dicyandiamide-formaldehyde.

[0061] Preparation Example 2: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0062] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1 °C. When white flocs were formed in the water, the addition was stopped. After the white flocs disappeared, the addition was resumed. The mixture was stirred continuously during the addition process. After the titration was completed, the mixture was stirred for another 3 hours to obtain a titanium tetrachloride solution.

[0063] 0.67 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. Then, titanium tetrachloride solution was mixed uniformly with the aluminum trichloride solution at a weight ratio of 1:1, so that the molar ratio of aluminum trichloride to titanium tetrachloride in the mixture was 0.5:1. The mixture was placed in the reaction chamber of an electrodialysis reactor. Subsequently, 0.5 mol / L sodium chloride solution was placed in the cathode chamber of the electrodialysis reactor, and 0.5 mol / L sodium sulfate solution was placed in the anode chamber of the electrodialysis reactor. After stirring with a magnetic stirrer for 5 minutes, the DC regulated power supply was turned on and adjusted to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0064] Preparation Example 3: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0065] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 1.0 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, resulting in a molar ratio of 0.75:1. The mixture was placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was then added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. A magnetic stirrer was used for 5 minutes, and then a DC regulated power supply was turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0066] Preparation Example 4: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0067] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 1.07 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, resulting in a molar ratio of 0.8:1. The mixture was placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was then added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. A magnetic stirrer was used for 5 minutes, and then a DC regulated power supply was turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0068] Preparation Example 5: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0069] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 1.33 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, ensuring a 1:1 molar ratio of aluminum trichloride to titanium tetrachloride. This mixture was then placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. The magnetic stirrer was turned on and stirred for 5 minutes. The DC regulated power supply was then turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0070] Preparation Example 6: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0071] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 1.6 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, resulting in a molar ratio of 1.2:1. The mixture was placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was then added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. A magnetic stirrer was used for 5 minutes of stirring. The DC regulated power supply was then turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0072] Preparation Example 7: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0073] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 2 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, resulting in a molar ratio of 1.5:1 for aluminum trichloride to titanium tetrachloride. The mixture was placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was then added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. The magnetic stirrer was turned on and stirred for 5 minutes. The DC regulated power supply was then turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0074] Preparation Example 8: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0075] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 2.67 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, resulting in a 2:1 molar ratio of aluminum trichloride to titanium tetrachloride. The mixture was placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was then added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. The magnetic stirrer was turned on and stirred for 5 minutes. The DC regulated power supply was then turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0076] Preparation Example 9: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0077] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 4 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride solution and aluminum trichloride solution were then uniformly mixed at a 1:1 weight ratio, resulting in a molar ratio of 3:1 for aluminum trichloride to titanium tetrachloride. The mixture was placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was then placed in the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was placed in the anode chamber. A magnetic stirrer was turned on and stirred for 5 minutes. The DC regulated power supply was then turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0078] Preparation Example 10: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0079] A method for preparing aluminum-titanium based polymers includes the following steps:

[0080] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 5.33 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, resulting in a molar ratio of 4:1. The mixture was placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was then added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. A magnetic stirrer was turned on and stirred for 5 minutes. The DC regulated power supply was then turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0081] Preparation Example 11: A method for preparing aluminum-titanium based polymers, comprising the following steps:

[0082] 1.19 kg of titanium tetrachloride was slowly added dropwise to water at 1°C. The addition was stopped when white flocs formed in the water, and resumed after the flocs disappeared. Stirring was maintained throughout the addition process. After titration, stirring was continued for 3 hours to obtain a titanium tetrachloride solution. 6.67 kg of aluminum trichloride was mixed with water to obtain an aluminum trichloride solution. The titanium tetrachloride and aluminum trichloride solutions were then uniformly mixed at a 1:1 weight ratio, resulting in a molar ratio of 5:1 for aluminum trichloride to titanium tetrachloride. This mixture was then placed in the reaction chamber of an electrodialysis reactor. A 0.5 mol / L sodium chloride solution was added to the cathode chamber of the electrodialysis reactor, and a 0.5 mol / L sodium sulfate solution was added to the anode chamber. The magnetic stirrer was turned on and stirred for 5 minutes. The DC regulated power supply was then turned on and set to constant current mode. The electrodialysis reaction time was 8 hours, and the current intensity was 0.02 A. Finally, an aluminum-titanium based polymer was obtained in the reaction chamber.

[0083] Preparation Example 12: A method for preparing a polyferric sulfate-polyacrylamide composite, comprising the following steps:

[0084] Mix 1 kg of polyferric sulfate and 0.5 kg of polyacrylamide evenly, and grind thoroughly with an agate mortar until the mixture turns yellow and the color no longer deepens, to obtain the polyferric sulfate-polyacrylamide composite.

[0085] Preparation Example 13: A method for preparing a polyferric sulfate-polyacrylamide composite, comprising the following steps:

[0086] Mix 1 kg of polyferric sulfate and 0.8 kg of polyacrylamide evenly, and grind thoroughly with an agate mortar until the mixture turns yellow and the color no longer deepens, to obtain the polyferric sulfate-polyacrylamide composite.

[0087] Preparation Example 14: A method for preparing a polyferric sulfate-polyacrylamide composite, comprising the following steps:

[0088] Mix 1 kg of polyferric sulfate and 1 kg of polyacrylamide evenly, and grind them thoroughly with an agate mortar until the color turns yellow and no longer deepens, to obtain the polyferric sulfate-polyacrylamide composite.

[0089] Preparation Example 15: A method for preparing a polyferric sulfate-polyacrylamide composite, comprising the following steps:

[0090] Mix 1 kg of polyferric sulfate and 1.5 kg of polyacrylamide evenly, and grind them thoroughly with an agate mortar until the color turns yellow and no longer deepens, to obtain the polyferric sulfate-polyacrylamide composite.

[0091] Preparation Example 16: A method for preparing a polyferric sulfate-polyacrylamide composite, comprising the following steps:

[0092] Mix 1 kg of polyferric sulfate and 2 kg of polyacrylamide evenly, and grind them thoroughly with an agate mortar until the color turns yellow and no longer deepens, to obtain the polyferric sulfate-polyacrylamide composite.

[0093] Preparation Example 17: A method for preparing a polyferric sulfate-polyacrylamide composite, comprising the following steps:

[0094] Mix 1 kg of polyferric sulfate and 2.5 kg of polyacrylamide evenly, and grind them thoroughly with an agate mortar until the color turns yellow and no longer deepens, to obtain the polyferric sulfate-polyacrylamide composite.

[0095] Preparation Example 18: A method for preparing a polyferric sulfate-polyacrylamide composite, comprising the following steps:

[0096] Mix 1 kg of polyferric sulfate and 3 kg of polyacrylamide evenly, and grind them thoroughly with an agate mortar until the color turns yellow and no longer deepens, to obtain the polyferric sulfate-polyacrylamide composite.

[0097] Several examples of decolorizing flocculants were prepared based on the materials obtained from the preparation examples.

[0098] Example 1

[0099] A method for preparing a decolorizing flocculant includes the following steps:

[0100] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0101] Example 2

[0102] A method for preparing a decolorizing flocculant includes the following steps:

[0103] 2.5 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.2 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.5 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0104] Example 3

[0105] A method for preparing a decolorizing flocculant includes the following steps:

[0106] 2.4 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.2 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.48 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0107] Example 4

[0108] A method for preparing a decolorizing flocculant includes the following steps:

[0109] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 3, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0110] Example 5

[0111] A method for preparing a decolorizing flocculant includes the following steps:

[0112] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 4, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0113] Example 6

[0114] A method for preparing a decolorizing flocculant includes the following steps:

[0115] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 5, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0116] Example 7

[0117] A method for preparing a decolorizing flocculant includes the following steps:

[0118] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 6, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0119] Example 8

[0120] A method for preparing a decolorizing flocculant includes the following steps:

[0121] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 7, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0122] Example 9

[0123] A method for preparing a decolorizing flocculant includes the following steps:

[0124] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 8, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0125] Example 10

[0126] A method for preparing a decolorizing flocculant includes the following steps:

[0127] Two kilograms of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kilograms of aluminum-titanium based polymer prepared in Preparation Example 9, and 0.4 kilograms of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0128] Example 11

[0129] A method for preparing a decolorizing flocculant includes the following steps:

[0130] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 10, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0131] Example 12

[0132] A method for preparing a decolorizing flocculant includes the following steps:

[0133] Two kilograms of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kilograms of aluminum-titanium based polymer prepared in Preparation Example 11, and 0.4 kilograms of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 12 were mixed evenly to obtain a decolorizing flocculant.

[0134] Example 13

[0135] A method for preparing a decolorizing flocculant includes the following steps:

[0136] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 13 were mixed evenly to obtain a decolorizing flocculant.

[0137] Example 14

[0138] A method for preparing a decolorizing flocculant includes the following steps:

[0139] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 14 were mixed evenly to obtain a decolorizing flocculant.

[0140] Example 15

[0141] A method for preparing a decolorizing flocculant includes the following steps:

[0142] Two kilograms of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kilograms of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.4 kilograms of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 15 were mixed evenly to obtain a decolorizing flocculant.

[0143] Example 16

[0144] A method for preparing a decolorizing flocculant includes the following steps:

[0145] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 16 were mixed evenly to obtain a decolorizing flocculant.

[0146] Example 17

[0147] A method for preparing a decolorizing flocculant includes the following steps:

[0148] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 17 were mixed evenly to obtain a decolorizing flocculant.

[0149] Example 18

[0150] A method for preparing a decolorizing flocculant includes the following steps:

[0151] 2 kg of ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1, 1.5 kg of aluminum-titanium based polymer prepared in Preparation Example 2, and 0.4 kg of polyferric sulfate-polyacrylamide composite prepared in Preparation Example 18 were mixed evenly to obtain a decolorizing flocculant.

[0152] Comparative Example 1

[0153] The difference from Example 1 is that all the ethylenediamine-modified dicyandiamide formaldehyde prepared in Preparation Example 1 was replaced with dicyandiamide formaldehyde, while the rest was the same as in Example 1.

[0154] Comparative Example 2

[0155] The difference from Example 1 is that the aluminum-titanium based polymer obtained in Preparation Example 2 was completely replaced with polytitanium chloride, while the rest was the same as in Example 1.

[0156] Comparative Example 3

[0157] The difference from Example 1 is that the aluminum-titanium based polymer obtained in Preparation Example 2 was completely replaced with polyaluminum chloride, while the rest was the same as in Example 1.

[0158] Comparative Example 4

[0159] The difference from Example 1 is that 1.5 kg of the aluminum-titanium based polymer prepared in Example 2 was replaced with 1 kg of polytitanium chloride and 0.5 kg of polyaluminum chloride, while the rest were the same as in Example 1.

[0160] Comparative Example 5

[0161] The difference from Example 1 is that the polyferric sulfate-polyacrylamide composite obtained in Preparation Example 12 was completely replaced with polyferric sulfate, while the rest was the same as in Example 1.

[0162] Comparative Example 6

[0163] The difference from Example 1 is that the polyferric sulfate-polyacrylamide composite obtained in Preparation Example 12 was completely replaced with polyacrylamide, while the rest was the same as in Example 1.

[0164] Comparative Example 7

[0165] The difference from Example 1 is that the polyferric sulfate-polyacrylamide composite prepared in Example 12 was completely replaced with 0.32 kg of polyferric sulfate and 0.16 kg of polyacrylamide, while the rest was the same as in Example 1.

[0166] Performance testing

[0167] The decolorization rate and decolorization retention rate of the decolorizing flocculants prepared in Examples 1-18 and Comparative Examples 1-7 were tested respectively. The results of the decolorization rate test are shown in Table 1, and the results of the decolorization retention rate are shown in Table 2.

[0168] The specific testing methods are as follows:

[0169] 1. Take simulated high-chromatic wastewater containing 150 mg / L Congo Red and 150 mg / L CI Reactive Black 5, and measure its absorbance A. 0-红 A 0-黑 The decolorizing flocculants from Examples 1-18 and Comparative Examples 1-7 were added to water at a dosage of 50 mg / L. The mixture was then stirred at 200 rpm for 2 minutes and then at 100 rpm for 8 minutes. After settling for 10 minutes, the supernatant was collected and its absorbance was measured. 1-红A 1-红 The individual decolorization rates of the two dyes were calculated according to E0 = (A0 - A) / A0 × 100%, and then the average value was calculated. The overall decolorization rate was recorded in Table 1.

[0170] 2. Take 2.5 g / L sodium sulfate, 150 mg / L Congo red and 150 mg / L CI active black 5, rich in inorganic salts, simulated high-color wastewater, repeat the operation in step 1 above, and record the overall decolorization rate in Table 1.

[0171] 3. Take 3.5 g / L sodium dodecylbenzenesulfonate, 150 mg / L Congo red and 150 mg / L CI active black 5, which are surfactant-rich simulated high-color wastewater, and repeat the operation in step 1 above. Record the overall decolorization rate in Table 1.

[0172] 4. Calculate the decolorization retention rate under the inorganic salt system / surfactant system, and record the results in Table 2. Decolorization retention rate of inorganic salt system = decolorization rate of inorganic salt system / decolorization rate × 100%, and decolorization retention rate of surfactant system = decolorization rate of surfactant system / decolorization rate × 100%.

[0173] Table 1: Decolorization rate of decolorizing flocculants in different systems

[0174]

[0175]

[0176] Table 2: Decolorization retention rate of decolorizing flocculants in different systems

[0177]

[0178]

[0179] As can be seen from Tables 1 and 2, the decolorization rate of the decolorizing flocculants prepared in Examples 1-2 can reach 99.02%-99.06%, the decolorization rate in the inorganic salt system can reach 95.11%-95.15%, the decolorization rate in the surfactant system can reach 95.63%-95.67%, the decolorization retention rate in the inorganic salt system is 96.05%-96.06%, and the decolorization retention rate in the surfactant system is 96.58-96.59%. This proves that the present invention utilizes the mixture of ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium polymer and polyferric sulfate-polyacrylamide composite, and the components fully exert the synergistic effect. It can not only achieve rapid floc formation and sedimentation, reduce the dye content in high-color wastewater and significantly reduce color, but also make the decolorizing flocculant widely applicable, and it can also play a good decolorization and flocculation effect in water bodies with complex composition.

[0180] The decolorization rates of the decolorizing flocculant in Example 3, the decolorization rates in the inorganic salt system, and the decolorization rates in the surfactant system were all higher than those in Example 1. This proves that the present invention further optimizes the decolorization effect of the decolorizing flocculant and its ability to adapt to water bodies with complex compositions by strictly controlling the weight ratio between ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium polymer and polyferric sulfate-polyacrylamide complex.

[0181] The difference between the decolorizing flocculants in Examples 4-12 lies in the different molar ratios of aluminum trichloride and titanium tetrachloride in the aluminum-titanium based polymers. Among them, the decolorization rates of the decolorizing flocculants in Examples 5-8, the decolorization rates in the inorganic salt system, and the decolorization rates in the surfactant system are all higher than those in other examples. In particular, the decolorization rate of Example 6 can reach 99.32%, the decolorization rate in the inorganic salt system can reach 95.41%, and the decolorization rate in the surfactant system can reach 95.94%. This proves that the present invention obtains aluminum-titanium based polymers with different aluminum / titanium molar ratios by gradually controlling the molar ratio of aluminum trichloride and titanium tetrachloride, thereby optimizing the flocculation ability of aluminum-titanium based polymers.

[0182] The difference between the decolorizing flocculants in Examples 13-18 lies in the different weight ratios of polyferric sulfate to polyacrylamide in the polyferric sulfate-polyacrylamide composite. The decolorization rates of the decolorizing flocculants in Examples 14-16, the decolorization rates in the inorganic salt system, and the decolorization rates in the surfactant system are all higher than those in other examples, proving that the present invention optimizes the flocculation ability of the polyferric sulfate-polyacrylamide composite by strictly controlling the weight ratio of polyferric sulfate to polyacrylamide.

[0183] The decolorization rates of the decolorizing flocculant in the inorganic salt system and the surfactant system of Comparative Example 1 were much lower than those in Example 1. Furthermore, the decolorization retention rates in the inorganic salt system and the surfactant system were also much lower than those in Example 1. This demonstrates that the ethylenediamine-modified dicyandiamide formaldehyde of the present invention has a large amount of cationic charge. When the content of inorganic salts or surfactants in high-color wastewater increases, that is, when the number of anions in the water increases and competes with the negative charge of the dye for the cationic adsorption sites of the decolorizing flocculant, it can still adsorb a large amount of dye and exert a good decolorization effect.

[0184] The decolorization rates of the decolorizing flocculants in Comparative Examples 2-4, the decolorization rates in the inorganic salt system, and the decolorization rates in the surfactant system were all lower than those in Example 1. This proves that the aluminum-titanium based polymer prepared by electrodialysis of aluminum trichloride and titanium tetrachloride in this invention has a high efficiency in decolorization and flocculation. It also has the advantages of fast floc formation and sedimentation speed, and large flocs. Its decolorization and flocculation effect is far superior to that of using aluminum salt flocculants / titanium salt flocculants alone or simply physically mixed aluminum salt flocculants and titanium salt flocculants.

[0185] The decolorization rates of the decolorizing flocculants in Comparative Examples 5-7, the decolorization rates in the inorganic salt system, and the decolorization rates in the surfactant system were all lower than those in Example 1. This proves that the polyferric sulfate-polyacrylamide composite obtained by mixing and grinding polyferric sulfate and polyacrylamide in a certain weight ratio has good charge neutralization and adsorption-trapping capabilities. It can efficiently adsorb dyes, form flocs, and promote the aggregation of floc particles and the further binding of short molecular chain flocs. Its decolorization and flocculation effect is far superior to that of using polyferric sulfate / polyacrylamide alone or simply physically mixing polyferric sulfate and polyacrylamide.

[0186] In summary, the decolorizing flocculant prepared by this invention has excellent decolorization rate and wide applicability.

[0187] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A decolorizing flocculant, characterized in that, Includes the following ingredients in parts by weight: 20-25 parts of ethylenediamine-modified dicyandiamide formaldehyde, 12-15 parts of aluminum-titanium-based polymer, and 4-5 parts of polyferric sulfate-polyacrylamide composite.

2. The decolorizing flocculant as described in claim 1, characterized in that, The decolorizing flocculant comprises the following raw materials in parts by weight: 22-25 parts of ethylenediamine-modified dicyandiamide formaldehyde, 12-14 parts of aluminum-titanium-based polymer, and 4.5-5 parts of polyferric sulfate-polyacrylamide composite.

3. A method for preparing a decolorizing flocculant according to claim 1 or 2, characterized in that, The process includes the following steps: mixing ethylenediamine-modified dicyandiamide formaldehyde, aluminum-titanium-based polymer, and polyferric sulfate-polyacrylamide composite evenly to obtain a decolorizing flocculant.

4. The method for preparing a decolorizing flocculant as described in claim 3, characterized in that: The method for preparing ethylenediamine-modified dicyandiamide formaldehyde includes: mixing dicyandiamine, formaldehyde and half of the ammonium chloride, stirring and heating, adding the remaining ammonium chloride and continuing to heat and react, adding ethylenediamine dropwise to react, and cooling to obtain ethylenediamine-modified dicyandiamide formaldehyde.

5. The method for preparing a decolorizing flocculant as described in claim 4, characterized in that: The mass ratio of dicyandiamide, formaldehyde, ammonium chloride, and ethylenediamine is 1:0.8-0.82:0.5-0.52:0.07-0.

09.

6. The method for preparing a decolorizing flocculant as described in claim 3, characterized in that: The method for preparing the aluminum-titanium based polymer includes: dispersing aluminum trichloride and titanium tetrachloride in water at a molar ratio of 0.5-5:1, and carrying out an electrodialysis reaction to obtain the aluminum-titanium based polymer.

7. The method for preparing a decolorizing flocculant as described in claim 6, characterized in that: The molar ratio of aluminum trichloride to titanium tetrachloride is 0.8-1.5:

1.

8. The method for preparing a decolorizing flocculant as described in claim 6, characterized in that: The method for preparing the aluminum-titanium based polymer includes: Preparation of titanium tetrachloride solution; Preparation of aluminum trichloride solution; After the prepared titanium tetrachloride solution and aluminum trichloride solution were mixed evenly, an electrodialysis reaction was carried out to obtain an aluminum-titanium based polymer.

9. The method for preparing a decolorizing flocculant as described in claim 8, characterized in that: The preparation of titanium tetrachloride solution includes: slowly adding titanium tetrachloride dropwise to water, pausing the addition when white flocculent material is produced in the water, and continuing the addition after the white flocculent material disappears, while continuously stirring during the addition process, and continuing to stir after the titration is completed to obtain titanium tetrachloride solution.

10. The method for preparing a decolorizing flocculant as described in claim 8, characterized in that: The conditions for the electrodialysis reaction are: current intensity of 0.01A-0.02A and reaction time of 7h-9h.

11. The method for preparing a decolorizing flocculant as described in claim 3, characterized in that: The preparation method of the polyferric sulfate-polyacrylamide composite includes: mixing polyferric sulfate and polyacrylamide in a weight ratio of 1:0.5-3, grinding, until the color of the system no longer changes, to obtain the polyferric sulfate-polyacrylamide composite.

12. The method for preparing a decolorizing flocculant as described in claim 11, characterized in that: The weight ratio of the polyferric sulfate to polyacrylamide is 1:1-2.

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