Preparation method of desulfurization wastewater flocculant

Abstract

The invention belongs to the technical field of desulfurization wastewater, and provides a preparation method of a desulfurization wastewater flocculant, which comprises a water-soluble high-molecular compound flocculant and an inorganic iron salt flocculant, and comprises the following components in percentage by weight: 0.01-2% of polyacrylamide, 0.01-15% of polyquaternium, 1-30% of polyferro-aluminum, 0.001-5% of a surfactant and the balance of water. The preparation method comprises the following steps: firstly, preparing a polysilicate ferric sulfate aluminum solution, then mixing and stirring polyacrylamide, polyquaternary ammonium salt, polyaluminum ferric sulfate, a surfactant and water to obtain a semi-finished solution, and finally, mixing the polysilicate ferric sulfate aluminum solution with the semi-finished solution to obtain a final solution; the water-soluble high-molecular compound flocculant and the inorganic iron salt flocculant are compounded together, so that the coagulation performance can be improved, impurities and pollutants in water can be quickly reacted, coagulated and precipitated, the water quality is effectively improved, the use amount is small, the cost is low, harmful substances are not contained, and the influence on human health is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of desulfurization wastewater, in particular to a method for preparing a desulfurization wastewater flocculant. Background Art

[0002] In recent years, with the increasingly stringent environmental regulations, the end-of-line wastewater from power plant desulfurization has been a problem that companies need to solve urgently. A large amount of wastewater is generated during the wet flue gas desulfurization process in thermal power plants. The impurities in these wastewaters come from the flue gas and the limestone used for desulfurization, mainly including suspended matter supersaturated with sulfites, sulfates and heavy metals. Due to the high salt content and complex composition of the end-of-line wastewater, it cannot be reused without deep treatment.

[0003] In general desulfurization wastewater, suspended solids and COD are the main objects to be removed. The conventional chemical method that can effectively remove suspended solids and COD is flocculation sedimentation. This method uses the interaction of molecular forces between suspended colloids and dispersed particles to form floccules after adding flocculants, and collides and condenses with each other during the sedimentation process. Its size and mass continue to increase, and the sedimentation rate continues to increase, and finally settles down to achieve the purpose of removing suspended solids and COD.

[0004] Desulfurization wastewater flocculants are mainly divided into two categories: inorganic flocculants and organic flocculants. Inorganic flocculants include ferric chloride, polyaluminium chloride, polyferric chloride, etc. These flocculants have strong flocculation ability and can quickly aggregate suspended matter in wastewater into larger blocks for subsequent treatment. Organic flocculants include polyacrylamide (PAM), polymers, etc. These flocculants have high flocculation speed and efficiency, and are particularly suitable for treating high-concentration wastewater.

[0005] However, the existing inorganic flocculants and organic flocculants, when used alone, have a relatively narrow water treatment range, and are not very effective in removing heavy metals and reducing COD; some of them, when used in combination, can achieve harmless treatment of wastewater, but they have a slow action speed, are highly corrosive, and will leave potential hazards in the environment, affecting human health, and they also have insufficient coagulation performance and slow sedimentation speed, requiring a large amount of medicine to be invested, increasing the cost of use.

[0006] To this end, those skilled in the art have proposed a method for preparing a desulfurization wastewater flocculant to solve the problems raised by the background technology. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a method for preparing a desulfurization wastewater flocculant to solve the problems in the prior art that some inorganic flocculants and organic flocculants, when used in combination, have slow action speed, strong corrosiveness, leave potential hazards in the environment, affect human health, and have insufficient coagulation performance, slow sedimentation speed, require a large amount of medicine to be invested, and increase the cost of use.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A method for preparing a desulfurization wastewater flocculant, comprising a water-soluble polymer compound flocculant and an inorganic iron salt flocculant, the main components of which include polyacrylamide, polyquaternary ammonium salt, polyaluminum iron, a surfactant, water and polysilicate aluminum ferric sulfate;

[0010] The weight percentages of the various components are as follows: polyacrylamide 0.01%-2%, polyquaternary ammonium salt 0.01%-15%, polyaluminum iron 1%-30%, surfactant 0.001%-5%, water 50%-90% and polysilicate aluminum ferric sulfate composite;

[0011] The preparation method comprises the following steps:

[0012] Step 1: First, prepare polysilicate aluminum ferric sulfate, and obtain polysilicate aluminum ferric sulfate solution through a series of processes;

[0013] Step 2: Select another preparation container, pour a suitable amount of water into the container, slowly add a suitable amount of polyquaternium salt powder into the water, stir at the same time to ensure that the powder can be evenly dispersed in the water, and heat appropriately to accelerate the dissolution process;

[0014] Step 3: Add solid polymer aluminum iron into the water while stirring;

[0015] Step 4: Disperse polyacrylamide powder in a small amount and add into water, stir thoroughly for 20-30 minutes to obtain solution 1;

[0016] Step 5: Add a surfactant to solution 1, stir, and then wait for 20-30 minutes until the solution is stable to obtain solution 2;

[0017] Step 6: Add the polysilicate aluminum ferric sulfate solution into solution 2 and stir thoroughly to obtain a final solution.

[0018] Preferably, the heating temperature in step 2 does not exceed 60°C.

[0019] Preferably, the method for preparing polyaluminum ferric sulfate silicate in step 1 is as follows:

[0020] (1) Raw material preparation: aluminum sulfate, sodium silicate, 85% phosphoric acid, homemade modified polyferric sulfate, stabilizer, coagulant; wherein the stabilizer and coagulant are both industrial products;

[0021] (2) Preparation steps: In a 100 mL three-necked flask, first add a measured amount of sodium silicate and 60 mL of deionized water, and heat to a set temperature while stirring. After the sodium silicate is dissolved, adjust the pH value of the reaction mixture with 85% phosphoric acid, continue stirring and reacting for 30-60 minutes, then add a measured amount of aluminum sulfate, modified polyferric sulfate solution, coagulant and stabilizer, continue to react at a set temperature for a set time, and then cool to obtain a polysilicate aluminum ferric sulfate solution.

[0022] Preferably, the temperature in the preparation step of the polysilicate aluminum ferric sulfate is set at 30-50°C.

[0023] Preferably, in the step of preparing the polysilicate aluminum ferric sulfate, the pH value of the reaction mixture is adjusted to 2.0-4.0 using 85% phosphoric acid.

[0024] Preferably, the stirring speed in the preparation step of the polysilicate aluminum ferric sulfate is 150-200 r / min.

[0025] Preferably, the preparation method of the homemade modified polyferric sulfate in the raw material of the polyferric aluminum silicate sulfate is as follows:

[0026] (1) Preparation of active silicic acid: Sodium silicate, ferric chloride and hydroquinone are mixed in a certain proportion and active silicic acid is prepared under specific conditions;

[0027] (2) Preparation of modified polyferric sulfate: Active silicic acid and polyferric sulfate solution are mixed in a certain proportion, and the modified polyferric sulfate solution is obtained after filtering.

[0028] Preferably, the preparation method of the polyferric sulfate solution mainly includes a direct oxidation method and a catalytic oxidation method.

[0029] Preferably, the weight percentages of the various components are: polyacrylamide 1%, polyquaternium salt 7%, polyaluminum iron 15%, surfactant 2%, and water 75%.

[0030] Preferably, the weight percentages of the various components are: 2% polyacrylamide, 15% polyquaternary ammonium salt, 20% polyaluminum iron, 3% surfactant, and 60% water.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention combines a water-soluble polymer flocculant with an inorganic iron salt flocculant, and then adds modified polymeric ferric sulfate. The modified polymeric ferric sulfate is prepared at a specific reaction temperature and reaction time. The turbidity removal effect is significantly better than that of a composite of a common inorganic flocculant and an organic flocculant, and the floc sedimentation rate is faster. When treating coking wastewater after biochemical treatment, the decolorization effect is also better than that of a composite of a common inorganic flocculant and an organic flocculant, and the dosage is small and the cost is low.

[0033] 2. The present invention uses iron salt inorganic molecules, such as polyaluminum ferric sulfate and polyaluminum iron, to make a composite solution, which can improve the coagulation performance, quickly react and condense the impurities and pollutants in the water, and effectively improve the water quality; it does not contain harmful substances such as heavy metal ions, has no negative impact on people's health, and is less corrosive to treatment equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 The present invention is a schematic flow chart of a method for preparing a desulfurization wastewater flocculant. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] As attached Figure 1 As shown:

[0038] Embodiment 1:

[0039] The present invention provides a method for preparing a desulfurization wastewater flocculant, comprising a water-soluble polymer compound flocculant and an inorganic iron salt flocculant, wherein the main components include polyacrylamide, polyquaternary ammonium salt, polyaluminum iron, a surfactant, water and polysilicate aluminum ferric sulfate;

[0040] The weight percentages of the various components are as follows: polyacrylamide 0.01%-2%, polyquaternary ammonium salt 0.01%-15%, polyaluminum iron 1%-30%, surfactant 0.001%-5%, water 50%-90% and polysilicate aluminum ferric sulfate composite;

[0041] The specific weight percentages of the various components are: 1% polyacrylamide, 7% polyquaternary ammonium salt, 15% polyaluminum iron, 2% surfactant, and 75% water.

[0042] The preparation method comprises the following steps:

[0043] Step 1: First, prepare polysilicate aluminum ferric sulfate, and obtain polysilicate aluminum ferric sulfate solution through a series of processes;

[0044] Specifically, the method for preparing polysilicate aluminum ferric sulfate in step 1 is as follows:

[0045] (1) Raw material preparation: aluminum sulfate, sodium silicate, 85% phosphoric acid, homemade modified polyferric sulfate, stabilizer, coagulant; wherein the stabilizer and coagulant are both industrial products;

[0046] (2) Preparation steps: In a 100 mL three-necked flask, first add a measured amount of sodium silicate and 60 mL of deionized water, and heat to a set temperature while stirring. After the sodium silicate is dissolved, adjust the pH value of the reaction mixture with 85% phosphoric acid, continue stirring and reacting for 40 minutes, then add a measured amount of aluminum sulfate, modified polyferric sulfate solution, coagulant and stabilizer, continue to react at a set temperature for a set time, and then cool to obtain a polysilicate aluminum ferric sulfate solution.

[0047] Specifically, the temperature in the preparation step of polysilicate aluminum ferric sulfate is set to 30°C.

[0048] Specifically, in the step of preparing polysilicate aluminum ferric sulfate, the pH value of the reaction mixture is adjusted to 2.0-4.0 using 85% phosphoric acid.

[0049] Step 2: Select another preparation container, pour a suitable amount of water into the container, slowly add a suitable amount of polyquaternium salt powder into the water, stir at the same time to ensure that the powder can be evenly dispersed in the water, and heat appropriately to accelerate the dissolution process;

[0050] Specifically, the heating temperature in step 2 does not exceed 60°C.

[0051] Step 3: Add solid polymer aluminum iron into the water while stirring;

[0052] Step 4: Disperse polyacrylamide powder in a small amount and add into water, stir thoroughly for 20 minutes to obtain solution 1;

[0053] Step 5: Add a surfactant to solution 1, stir, and then wait for 20 minutes until the solution is stable to obtain solution 2;

[0054] Step 6: Add the polysilicate aluminum ferric sulfate solution into solution 2 and stir thoroughly to obtain a final solution.

[0055] Specifically, in the preparation step of the polysilicate aluminum ferric sulfate, the stirring speed is 150 r / min.

[0056] Specifically, the method for preparing the homemade modified polyferric sulfate in the raw material of the polyferric aluminum sulfate is as follows:

[0057] (1) Preparation of active silicic acid: Sodium silicate, ferric chloride and hydroquinone are mixed in a certain proportion and active silicic acid is prepared under specific conditions;

[0058] (2) Preparation of modified polyferric sulfate: Active silicic acid and polyferric sulfate solution are mixed in a certain proportion, and the modified polyferric sulfate solution is obtained after filtering.

[0059] From the above, it can be seen that by compounding a water-soluble polymer flocculant with an inorganic iron salt flocculant, and then adding modified polyferric sulfate, the modified polyferric sulfate is made under specific reaction temperature and reaction time. The turbidity removal effect is significantly better than the composite of ordinary inorganic flocculants and organic flocculants, and the floc sedimentation rate is faster; when treating coking wastewater after biochemical treatment, its decolorization effect is also better than the composite of ordinary inorganic flocculants and organic flocculants, and the dosage is less.

[0060] Embodiment 2:

[0061] A method for preparing a desulfurization wastewater flocculant, comprising a water-soluble polymer compound flocculant and an inorganic iron salt flocculant, the main components of which include polyacrylamide, polyquaternary ammonium salt, polyaluminum iron, a surfactant, water and polysilicate aluminum ferric sulfate;

[0062] The weight percentages of the various components are: 2% polyacrylamide, 15% polyquaternary ammonium salt, 20% polyaluminum iron, 3% surfactant, and 60% water.

[0063] The preparation method comprises the following steps:

[0064] Step 1: First, prepare polysilicate aluminum ferric sulfate, and obtain polysilicate aluminum ferric sulfate solution through a series of processes;

[0065] Specifically, the method for preparing polysilicate aluminum ferric sulfate in step 1 is as follows:

[0066] (1) Raw material preparation: aluminum sulfate, sodium silicate, 85% phosphoric acid, homemade modified polyferric sulfate, stabilizer, coagulant; wherein the stabilizer and coagulant are both industrial products;

[0067] (2) Preparation steps: In a 100 mL three-necked flask, first add a measured amount of sodium silicate and 60 mL of deionized water, and heat to a set temperature while stirring. After the sodium silicate is dissolved, adjust the pH value of the reaction mixture with 85% phosphoric acid, continue stirring and reacting for 60 minutes, then add a measured amount of aluminum sulfate, modified polyferric sulfate solution, coagulant and stabilizer, continue the reaction at a set temperature for a set time, and then cool to obtain a polysilicate aluminum ferric sulfate solution.

[0068] Specifically, the temperature in the preparation step of polysilicate aluminum ferric sulfate is set to 40°C.

[0069] Specifically, in the step of preparing polysilicate aluminum ferric sulfate, the pH value of the reaction mixture is adjusted to 2.0-4.0 using 85% phosphoric acid.

[0070] Step 2: Select another preparation container, pour a suitable amount of water into the container, slowly add a suitable amount of polyquaternium salt powder into the water, stir at the same time to ensure that the powder can be evenly dispersed in the water, and heat appropriately to accelerate the dissolution process;

[0071] Specifically, the heating temperature in step 2 does not exceed 60°C.

[0072] Step 3: Add solid polymer aluminum iron into the water while stirring;

[0073] Step 4: Disperse polyacrylamide powder in a small amount and add into water, stir thoroughly for 30 minutes to obtain solution 1;

[0074] Step 5: Add a surfactant to solution 1, stir, and then wait for 30 minutes until the solution is stable to obtain solution 2;

[0075] Step 6: Add the polysilicate aluminum ferric sulfate solution into solution 2 and stir thoroughly to obtain a final solution.

[0076] Specifically, in the preparation step of the polysilicate aluminum ferric sulfate, the stirring speed is 200 r / min.

[0077] From the above, it can be seen that the weight percentages of various components of polyacrylamide, polyquaternary ammonium salt, polyaluminum iron, surfactant, and water are adjusted, and the weight percentages of polyacrylamide, polyquaternary ammonium salt, polyaluminum iron, and surfactant are increased for preparation.

[0078] Embodiment 3:

[0079] This embodiment relates to a method for preparing a polyferric sulfate solution, which mainly includes a direct oxidation method and a catalytic oxidation method.

[0080] 1) Direct oxidation method also includes hydrogen peroxide oxidation method and potassium (sodium) chlorate oxidation method.

[0081] Hydrogen peroxide oxidation method: In an acidic environment, hydrogen peroxide, as a strong oxidant, can oxidize ferrous ions into trivalent ferrous ions, thereby forming polyferric sulfate. The specific steps include dissolving ferrous sulfate in water, adding an appropriate amount of sulfuric acid to adjust the pH value, and then slowly adding hydrogen peroxide under stirring conditions. As the ferrous ions decrease, the color of the solution gradually changes from green to reddish brown, and finally a polyferric sulfate solution is obtained.

[0082] Potassium (sodium) chlorate oxidation method: Potassium chlorate is a strong oxidant that can oxidize ferrous ions into trivalent ferrous ions to form polyferric sulfate.

[0083] 1) Catalytic oxidation method:

[0084] The catalytic oxidation method uses a catalyst (such as NaNO2) and an oxidant (such as oxygen or air) to oxidize ferrous sulfate in an acidic medium to generate trivalent iron ions, which are then neutralized, hydrolyzed, and polymerized to produce polyferric sulfate.

[0085] As can be seen from the above, the polyferric sulfate solution involved in the present application can be prepared by direct oxidation and catalytic oxidation. The polyferric sulfate solution is a high-efficiency iron salt inorganic molecule, and its main characteristics include fastness, strong applicability, small dosage and low cost. The polyferric sulfate solution is mixed with active silicate in a certain proportion, and a modified polyferric sulfate solution is obtained through a filtration process, which can improve the flocculation performance and enhance the treatment effect, so that it is more effective in treating wastewater, while reducing the cost of use.

[0086] Comparative Example:

[0087] In this comparative example, compared with Example 1 and Example 2, no polysilicate aluminum ferric sulfate was added, and the specific steps included the following:

[0088] Step 1: Select another preparation container, pour a suitable amount of water into the container, slowly add a suitable amount of polyquaternium salt powder into the water, stir at the same time to ensure that the powder can be evenly dispersed in the water, and heat appropriately to accelerate the dissolution process;

[0089] Specifically, the heating temperature in step 2 does not exceed 60°C.

[0090] Step 2: Add solid polymerized aluminum iron into the water, stirring;

[0091] Step 3: Disperse polyacrylamide powder in a small amount and add into water, stir thoroughly for 20 minutes to obtain solution 1;

[0092] Step 4: Add a surfactant to solution 1, stir, and then wait for 20 minutes until the solution is stable to obtain a final solution;

[0093] Specifically, in the preparation step of the polysilicate aluminum ferric sulfate, the stirring speed is 150 r / min.

[0094] As can be seen from the above, the actual water treatment effect produced by the comparative example is lower than the actual water treatment effect of Example 1 and Example 2.

[0095] In summary, the practical use of the present invention includes the following points:

[0096] 1) Excellent coagulation performance: Iron salt inorganic polymer flocculants have excellent coagulation performance, which can quickly coagulate and precipitate impurities and pollutants in the water, effectively improving water quality.

[0097] 2) Non-toxic and harmless: It does not contain harmful substances such as heavy metal ions, is non-toxic and harmless, safe and reliable, and has no negative impact on people's health.

[0098] 3) Strong adaptability: It can adapt to a wide pH range of 4-11 in water bodies, and the optimal pH range is 6-9. The pH value and total alkalinity of the raw water after purification vary little, and it has little corrosion to the treatment equipment.

[0099] 4) Good treatment effect: It has significant effect on the purification of slightly polluted, algae-containing, low-temperature and low-turbidity raw water, and is especially suitable for the purification of high-turbidity raw water.

[0100] 5) Low cost: small dosage and low cost.

[0101] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

[0102] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a desulfurization wastewater flocculant, characterized in that: It includes water-soluble polymer compound flocculants and inorganic iron salt flocculants, and its main ingredients include polyacrylamide, polyquaternary ammonium salt, polyaluminum iron, surfactant, water and polysilicate aluminum ferric sulfate; The weight percentages of the various components are as follows: polyacrylamide 0.01%-2%, polyquaternary ammonium salt 0.01%-15%, polyaluminum iron 1%-30%, surfactant 0.001%-5%, water 50%-90% and polysilicate aluminum ferric sulfate composite; The preparation method comprises the following steps: Step 1: First, prepare polysilicate aluminum ferric sulfate, and obtain polysilicate aluminum ferric sulfate solution through a series of processes; Step 2: Select another preparation container, pour a suitable amount of water into the container, slowly add a suitable amount of polyquaternium salt powder into the water, stir at the same time to ensure that the powder can be evenly dispersed in the water, and heat appropriately to accelerate the dissolution process; Step 3: Add solid polymer aluminum iron into the water while stirring; Step 4: Disperse polyacrylamide powder in a small amount and add into water, stir thoroughly for 20-30 minutes to obtain solution 1; Step 5: Add a surfactant to solution 1, stir, and then wait for 20-30 minutes until the solution is stable to obtain solution 2; Step 6: Add the polysilicate aluminum ferric sulfate solution into solution 2 and stir thoroughly to obtain a final solution.

2. The method for preparing a desulfurization wastewater flocculant as claimed in claim 1, characterized in that: The heating temperature in the step 2 does not exceed 60°C.

3. The method for preparing a desulfurization wastewater flocculant as claimed in claim 1, characterized in that: The method for preparing polyaluminium ferric sulfate in step 1 is as follows: (1) Raw material preparation: aluminum sulfate, sodium silicate, 85% phosphoric acid, homemade modified polyferric sulfate, stabilizer, coagulant; wherein the stabilizer and coagulant are both industrial products; (2) Preparation steps: In a 100 mL three-necked flask, first add a measured amount of sodium silicate and 60 mL of deionized water, and heat to a set temperature while stirring. After the sodium silicate is dissolved, adjust the pH value of the reaction mixture with 85% phosphoric acid, continue stirring and reacting for 30-60 minutes, then add a measured amount of aluminum sulfate, modified polyferric sulfate solution, coagulant and stabilizer, continue to react at a set temperature for a set time, and then cool to obtain a polysilicate aluminum ferric sulfate solution.

4. The method for preparing a desulfurization wastewater flocculant as claimed in claim 3, characterized in that: The temperature in the preparation step of the polysilicate aluminum ferric sulfate is set at 30-50°C.

5. The method for preparing a desulfurization wastewater flocculant as claimed in claim 3, characterized in that: In the step of preparing the polysilicate aluminum ferric sulfate, the pH value of the reaction mixture is adjusted to 2.0-4.0 using 85% phosphoric acid.

6. The method for preparing a desulfurization wastewater flocculant according to claim 1, characterized in that: In the preparation step of the polysilicate aluminum ferric sulfate, the stirring speed is 150-200 r / min.

7. The method for preparing a desulfurization wastewater flocculant as claimed in claim 3, characterized in that: The method for preparing the homemade modified polyferric sulfate in the raw material of the polyferric aluminum silicate sulfate is as follows: (1) Preparation of active silicic acid: Sodium silicate, ferric chloride and hydroquinone are mixed in a certain proportion and active silicic acid is prepared under specific conditions; (2) Preparation of modified polyferric sulfate: Active silicic acid and polyferric sulfate solution are mixed in a certain proportion, and the modified polyferric sulfate solution is obtained after filtering.

8. The method for preparing a desulfurization wastewater flocculant as claimed in claim 7, characterized in that: The preparation method of the polyferric sulfate solution mainly includes a direct oxidation method and a catalytic oxidation method.

9. The method for preparing a desulfurization wastewater flocculant according to claim 1, characterized in that: The weight percentages of the various components are: 1% polyacrylamide, 7% polyquaternary ammonium salt, 15% polyaluminum iron, 2% surfactant, and 75% water.

10. The method for preparing a desulfurization wastewater flocculant according to claim 1, characterized in that: The weight percentages of the various components are: 2% polyacrylamide, 15% polyquaternary ammonium salt, 20% polyaluminum iron, 3% surfactant, and 60% water.

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