CN111302463A - Polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater and preparation method thereof - Google Patents
Polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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Abstract
The invention relates to a polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater and a preparation method thereof. The method comprises the following steps: adding aluminum sulfate octadecahydrate and ferric sulfate into water for dissolving, then adding the solution into a reactor, heating to 70-90 ℃, then adding a phosphoric acid solution, and stirring for a period of time; keeping the temperature at 70-90 ℃, adding magnesium oxide, stirring and dissolving, and adjusting the pH value to be acidic; and (3) at 70-90 ℃, keeping the temperature, stirring and reacting for a period of time, and finally taking out the liquid in the reactor and standing for more than 24 hours. When the composite flocculant prepared by the method is used for treating an active turquoise blue K-GL solution with the concentration of 10-500mg/L, pH of 7-12.5, the dye removal rate can reach more than 98%; when the direct blue 2B dye solution with the concentration of 10-500mg/L, pH of 7-12.5 is processed, the dye removal rate can reach more than 99 percent.
Description
Technical Field
The invention belongs to the technical field of flocculant preparation, and particularly relates to a polyaluminium-iron-magnesium composite flocculant for treating dye wastewater and a preparation method thereof.
Background
The printing and dyeing wastewater is a general name of various wastewater discharged in the production process of printing and dyeing enterprises after being mixed. The printing and dyeing wastewater belongs to typical high-concentration, high-chroma and refractory organic industrial wastewater, contains a large amount of dye, auxiliary agent, slurry, acid and alkali, fiber impurities, inorganic salt and the like, has complex composition and large fluctuation of water quality and water quantity, and the nitro group, amino compound, copper, chromium, zinc, arsenic and other heavy metal elements have large biological toxicity and are very difficult to treat. For a long time, printing and dyeing wastewater is always the key point and difficulty of industrial wastewater treatment. The traditional printing and dyeing wastewater treatment technology comprises an electrolysis method, an oxidation method, an adsorption method, a coagulation method, a biological method and the like. Among them, the coagulation method is one of the effective methods for treating printing and dyeing wastewater, but the effect of treating printing and dyeing wastewater with complicated components by using conventional flocculants (polyaluminium chloride, ferric sulfate, etc.) is not very ideal. Therefore, the development of the flocculant with broad spectrum and high efficiency for treating the printing and dyeing wastewater is necessary.
Preparation and application research of iron-magnesium-aluminum inorganic composite decolorizing flocculant [ J ] chemical environmental protection 2004,24(4): 301-. When the addition amount of the flocculant is 1mL/L, the removal rate of the flocculant on a disperse yellow dye solution with the pH value of 12 and 100mg/L reaches 90.7 percent. Wei et al [ Wei Y, Ji Q, Chen L, et al preparation of an inorganic complex-silicate-magnesium for curing water treatment, effective of acid medium on the chromatography and chromatography performance [ J ]. Journal of Taiwan Institute of Chemical Engineers,2017,72: 142) first drop sodium silicate solution into sulfuric acid solution to obtain a polysilicic acid solution; then adding a certain amount of magnesium chloride solution at room temperature under stirring to prepare the polymerized magnesium silicate flocculant. The addition amount of the flocculant is small when the flocculant is used for treating dye wastewater, but the decoloration rate is difficult to reach more than 95%.
Chinese invention patent CN104355380A reports a flocculant for treating dye wastewater and a preparation method thereof. The method mixes hydrotalcite, poly-phosphorus ferric chloride, polyaluminium chloride and magnesium sulfate with a certain amount of water according to a certain proportion, and prepares the flocculating agent for treating dye wastewater after uniformly stirring. The flocculant has simple preparation process and low cost, but is difficult to achieve higher decolorization rate. The Chinese invention patent CN102674511A reports a preparation method of a composite flocculant for printing and dyeing wastewater treatment. Grinding magnesium ore and red mud, roasting, adding the ground magnesium ore and red mud into a reaction kettle according to a certain mass ratio, and reacting the ground magnesium ore and red mud with a certain amount of hydrochloric acid under sealed heat preservation. Then adding calcium aluminate into the reactor, and mixing and reacting to obtain the flocculant. The preparation method has low cost and easily obtained raw materials, but the prepared flocculating agent is difficult to achieve high decolorization rate when used for treating dye wastewater.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention aims to provide the polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater.
The invention also aims to provide a preparation method of the polymeric aluminum-iron-magnesium composite flocculant. The method has simple preparation process, and the prepared flocculant has high decolorization rate for various dyes such as reactive dye, direct dye and the like, has small addition amount and wide pH treatment range, and has important significance for treating printing and dyeing wastewater.
The purpose of the invention is realized by the following technical scheme:
the polymeric aluminum iron magnesium composite flocculant for treating dye wastewater is characterized by being prepared from aluminum sulfate octadecahydrate, ferric sulfate and magnesium oxide through polymerization reaction.
Preferably, the polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater is prepared by polymerization reaction of 20 parts by mass of aluminum sulfate octadecahydrate, 2 parts by mass of ferric sulfate and 0.8-1.2 parts by mass of magnesium oxide.
A preparation method of a polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater comprises the following steps:
adding aluminum sulfate octadecahydrate and ferric sulfate into water for dissolving, then adding the solution into a reactor, heating to 70-90 ℃, then adding a phosphoric acid solution, and stirring for a period of time; keeping the temperature at 70-90 ℃, adding magnesium oxide, stirring and dissolving, and adding sodium carbonate to adjust the pH value; and (3) keeping the temperature of 70-90 ℃, stirring and reacting for a period of time, finally taking out the liquid in the reactor, and standing for more than 24 hours to obtain the polyaluminium-iron-magnesium composite flocculant.
Preferably, the water is 25 parts by volume.
Preferably, the phosphoric acid solution is added in an amount of 0.8 parts by volume, and the concentration of the phosphoric acid solution is 85 wt%.
Preferably, the reaction time is 2-4h under the condition of heat preservation and stirring.
Preferably, the three stirring speeds in the preparation step are 90-120r/min, 160-200r/min and 120-150r/min in sequence.
Preferably, the pH value regulator is 2.5-3.5.
Preferably, the reactor is a reactor with stirring and refluxing means.
In the invention, 1 part by mass: 1 part by volume is 1 g/mL.
The composite flocculant prepared by the method is added in an amount of 0.3-1.1mL/L when treating an active turquoise blue K-GL solution with the concentration of 10-500mg/L, pH of 7-12.5, and the dye removal rate can reach more than 98%; when the direct blue 2B dye solution with the concentration of 10-500mg/L, pH of 7-12.5 is treated, the adding amount is 0.3-1.2mL/L, and the dye removal rate can reach more than 99%.
Compared with other flocculating agents for treating dye wastewater, the polymeric aluminum-iron-magnesium composite flocculating agent has the following advantages:
(1) the preparation process is simple, the basicity is adjusted by adopting the magnesium oxide with lower cost, and the magnesium element can be converted into the effective component of the flocculating agent.
(2) The flocculant prepared by the invention has the advantages of small dosage, wide pH range for treatment and high removal rate for various dyes when used for treating dye wastewater.
Drawings
FIG. 1 is an FT-IR spectrum of a polyaluminum ferric magnesium composite flocculant prepared in examples 1-6;
FIG. 2 is an XRD pattern of the polyaluminum ferrum-magnesium composite flocculant prepared in the embodiment 1-6;
wherein the curves numbered 1, 2, 3, 4, 5 and 6 represent the test curves of the polyaluminium-iron-magnesium composite flocculant of examples 1-6, respectively.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Aluminum sulfate, ferric sulfate and magnesium oxide can be used for treating wastewater, for example 201410235276.8 discloses a sludge dewatering conditioner which comprises the following components in percentage by weight: 30-70% of desulfurized fly ash, 5-15% of magnesium salt, 5-30% of iron salt, 2-20% of aluminum salt and 0.1-15% of magnesium oxide. Magnesium salt as coagulant aid can change the structure of sludge particles besides adjusting pH, and form a porous latticed framework in sludge, thereby greatly improving the compressibility of sludge and enhancing the strength of flocs. The ferric salt is one of ferric trichloride, ferric sulfate, polymeric ferric sulfate and copperas. Ferric salt (such as ferric trichloride, ferric sulfate, polymeric ferric sulfate and the like) is hydrolyzed to form colloidal hydrocarbyl polymer or hydroxide precipitate, the stability of large-particle sludge is changed through the actions of electrostatic adhesion, net capture and the like, and floc particles with certain bearing capacity are formed by rolling and sweeping small-particle sludge. The aluminum salt is one of polyaluminium chloride, aluminum sulfate, alum and polyaluminium ferric sulfate. The addition of aluminum salt has the functions of heavy metal passivation, sterilization and deodorization, and can lead the heavy metal in an ionic state to generate hydroxide precipitate in an alkaline environment.
Example 1
Dissolving 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stirring until the solution is clear and transparent, adding 2g of ferric sulfate, and continuously stirring until the solution is clear and transparent; putting the solution into a reactor with a stirring and refluxing device, slowly heating to 70 ℃ and keeping the temperature basically unchanged, then dropwise adding 0.8mL of 85 wt% phosphoric acid solution, and stirring for 10min at the rotating speed of 90 r/min; keeping the temperature of the previous step basically unchanged, adding 1.2g of magnesium oxide into the reactor, adjusting the stirring speed of the reactor to 160r/min, and slowly adding sodium carbonate solid until the pH value of the solution is 3 after the solid is completely dissolved; keeping the temperature of the previous step unchanged basically, adjusting the stirring speed of the reactor to 120r/min, keeping the temperature of the reactor for 4h, taking out the liquid in the reactor, standing and cooling to room temperature to obtain the polymeric aluminum-iron-magnesium composite flocculant.
Adding 50 mu L of the prepared flocculant into 100mL of active turquoise blue K-GL solution with the concentration of 100mg/L, pH-9, and adding the flocculant in an amount of 0.5 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet-visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.6%.
Adding 50 mu L of the flocculant into 100mL of direct blue 2B solution with the concentration of 100mg/L, pH being 9, wherein the adding amount is 0.5 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.7%.
Example 2
Dissolving 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stirring until the solution is clear and transparent, adding 2g of ferric sulfate, and continuously stirring until the solution is clear and transparent; putting the solution into a reactor with a stirring and refluxing device, slowly heating to 90 ℃ and keeping the temperature basically unchanged, then dropwise adding 0.8mL of 85 wt% phosphoric acid solution, and stirring for 10min at the rotating speed of 120 r/min; keeping the temperature of the previous step basically unchanged, adding 0.8g of magnesium oxide into the reactor, adjusting the stirring speed of the reactor to 200r/min, and slowly adding sodium carbonate solid until the pH value of the solution is 3 after the solid is completely dissolved; keeping the temperature of the previous step unchanged basically, adjusting the stirring speed of the reactor to 150r/min, keeping the temperature of the reactor for 2h, taking out the liquid in the reactor, standing and cooling to room temperature to obtain the polymeric aluminum-iron-magnesium composite flocculant.
Adding 80 μ L of the flocculant into 100mL of active turquoise blue K-GL solution with the concentration of 100mg/L, pH of 12.5, wherein the adding amount is 0.8 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below the liquid level for 2cm, passing through a filter equipped with 0.45 μm filter membrane, and measuring the residual dye concentration with ultraviolet-visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 98.1%.
Adding 80 mu L of the flocculant into 100mL of direct blue 2B solution with the concentration of 100mg/L, pH-12.5, wherein the adding amount is 0.8 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.4%.
Example 3
Dissolving 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stirring until the solution is clear and transparent, adding 2g of ferric sulfate, and continuously stirring until the solution is clear and transparent; putting the solution into a reactor with a stirring and refluxing device, slowly heating to 80 ℃ and keeping the temperature basically unchanged, then dropwise adding 0.8mL of 85 wt% phosphoric acid solution, and stirring for 10min at the rotating speed of 100 r/min; keeping the temperature of the previous step basically unchanged, adding 0.8g of magnesium oxide into the reactor, adjusting the stirring speed of the reactor to 180r/min, and slowly adding sodium carbonate solid until the pH value of the solution is 2.5 after the solid is completely dissolved; keeping the temperature of the previous step unchanged basically, adjusting the stirring speed of the reactor to 135r/min, keeping the temperature of the reactor for 3h, taking out the liquid in the reactor, standing and cooling to room temperature to obtain the polymeric aluminum-iron-magnesium composite flocculant.
Adding 30 mu L of the flocculant into 100mL of active turquoise blue K-GL solution with the concentration of 10mg/L, pH-8, wherein the adding amount is 0.3 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below the liquid level for 2cm, passing through a filter equipped with 0.45 μm filter membrane, and measuring the residual dye concentration with ultraviolet-visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 98.2%.
Adding 30 mu L of the flocculant into 100mL of direct blue 2B solution with the concentration of 10mg/L, pH-7, wherein the adding amount is 0.3 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.3%.
Example 4
Dissolving 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stirring until the solution is clear and transparent, adding 2g of ferric sulfate, and continuously stirring until the solution is clear and transparent; putting the solution into a reactor with a stirring and refluxing device, slowly heating to 80 ℃ and keeping the temperature basically unchanged, then dropwise adding 0.8mL of 85 wt% phosphoric acid solution, and stirring for 10min at the rotating speed of 90 r/min; keeping the temperature of the previous step basically unchanged, adding 1.2g of magnesium oxide into the reactor, adjusting the stirring speed of the reactor to 160r/min, and slowly adding sodium carbonate solid until the pH value of the solution is 2.5 after the solid is completely dissolved; keeping the temperature of the previous step unchanged basically, adjusting the stirring speed of the reactor to 120r/min, keeping the temperature of the reactor for 2h, taking out the liquid in the reactor, standing and cooling to room temperature to obtain the polymeric aluminum-iron-magnesium composite flocculant.
Adding 80 mu L of the flocculant into 100mL of active turquoise blue K-GL solution with the concentration of 250mg/L, pH-8, wherein the adding amount is 0.8 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.5%.
Adding 80 mu L of the flocculant into 100mL of direct blue 2B solution with the concentration of 250mg/L, pH-8, wherein the adding amount is 0.8 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.7%.
Example 5
Dissolving 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stirring until the solution is clear and transparent, adding 2g of ferric sulfate, and continuously stirring until the solution is clear and transparent; putting the solution into a reactor with a stirring and refluxing device, slowly heating to 70 ℃ and keeping the temperature basically unchanged, then dropwise adding 0.8mL of 85 wt% phosphoric acid solution, and stirring for 10min at the rotating speed of 90 r/min; keeping the temperature of the previous step basically unchanged, adding 1.0g of magnesium oxide into the reactor, adjusting the stirring speed of the reactor to 160r/min, and slowly adding sodium carbonate solid until the pH value of the solution is 3.5 after the solid is completely dissolved; keeping the temperature of the previous step unchanged basically, adjusting the stirring speed of the reactor to 120r/min, keeping the temperature of the reactor for 3h, taking out the liquid in the reactor, standing and cooling to room temperature to obtain the polymeric aluminum-iron-magnesium composite flocculant.
Adding 110 mu L of flocculant into 100mL of active turquoise blue K-GL solution with the concentration of 500mg/L, pH-7, wherein the adding amount is 1.1 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.8%.
Adding 100 mu L of flocculant into 100mL of direct blue 2B solution with the concentration of 500mg/L, pH-9, wherein the adding amount is 1.0 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.8%.
Example 6
Dissolving 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stirring until the solution is clear and transparent, adding 2g of ferric sulfate, and continuously stirring until the solution is clear and transparent; putting the solution into a reactor with a stirring and refluxing device, slowly heating to 90 ℃ and keeping the temperature basically unchanged, then dropwise adding 0.8mL of 85 wt% phosphoric acid solution, and stirring for 10min at the rotating speed of 90 r/min; keeping the temperature of the previous step basically unchanged, adding 1.0g of magnesium oxide into the reactor, adjusting the stirring speed of the reactor to 160r/min, and slowly adding sodium carbonate solid until the pH value of the solution is 3 after the solid is completely dissolved; keeping the temperature of the previous step unchanged basically, adjusting the stirring speed of the reactor to 120r/min, keeping the temperature of the reactor for 3h, taking out the liquid in the reactor, standing and cooling to room temperature to obtain the polymeric aluminum-iron-magnesium composite flocculant.
Adding 110 mu L of the flocculant into 100mL of active turquoise blue K-GL solution with the concentration of 500mg/L, pH-8.5, and adding the flocculant in an amount of 1.1 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.8%.
Adding 120 mu L of the flocculant into a direct blue 2B solution with the concentration of 500mg/L, pH-9 and the adding amount is 1.2 mL/L; stirring rapidly at 200r/min for 1min, then stirring slowly at 50r/min for 3min, standing for 30min, collecting liquid below 2cm of liquid level, passing through a filter equipped with 0.45 μm filter membrane, and measuring residual dye concentration with ultraviolet visible spectrophotometer (UV-1240, Shimadzu, Japan) to obtain dye removal rate of 99.9%.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. The polymeric aluminum iron magnesium composite flocculant for treating dye wastewater is characterized by being prepared from aluminum sulfate octadecahydrate, ferric sulfate and magnesium oxide through polymerization reaction.
2. The polymeric aluminum iron magnesium composite flocculant for treating dye wastewater according to claim 1, which is prepared by polymerization reaction of 20 parts by mass of aluminum sulfate octadecahydrate, 2 parts by mass of ferric sulfate and 0.8-1.2 parts by mass of magnesium oxide.
3. The preparation method of the polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater according to claim 1 or 2, characterized by comprising the following steps:
adding aluminum sulfate octadecahydrate and ferric sulfate into water for dissolving, then adding the solution into a reactor, heating to 70-90 ℃, then adding a phosphoric acid solution, and stirring for a period of time; keeping the temperature at 70-90 ℃, adding magnesium oxide, stirring and dissolving, and adding sodium carbonate to adjust the pH value; and (3) keeping the temperature of 70-90 ℃, stirring and reacting for a period of time, finally taking out the liquid in the reactor, and standing for more than 24 hours to obtain the polyaluminium-iron-magnesium composite flocculant.
4. The method for preparing polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater according to claim 3, wherein the water is 25 parts by volume, the phosphoric acid solution is added in an amount of 0.8 parts by volume, and the concentration of the phosphoric acid solution is 85 wt%.
5. The preparation method of the polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater according to claim 3, wherein the reaction time of the heat preservation stirring is 2-4 h.
6. The method as claimed in claim 3, wherein the three stirring speeds in the step of preparing are 90-120r/min, 160-200r/min, and 120-150 r/min.
7. The method for preparing polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater according to claim 3, wherein the pH value is adjusted to 2.5-3.5.
8. The method for preparing the polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater according to claim 3, wherein the reactor is a reactor with stirring and refluxing devices.
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