Polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater, and preparation method of polymeric aluminum-iron-magnesium composite flocculant

A composite flocculant and polymerized aluminum-iron technology, which is applied in water/sewage treatment, chemical instruments and methods, textile industry wastewater treatment, etc., can solve the problems of low cost and difficult to achieve high decolorization rate of dye wastewater treated by flocculants. Achieve high removal rate, less dosage and simple preparation process

Inactive Publication Date: 2020-06-19
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the preparation method is low and the raw materials are easy to obtain, but it is difficult to achieve a high decolorization rate for the prepared flocculant to treat dye wastewater

Method used

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  • Polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater, and preparation method of polymeric aluminum-iron-magnesium composite flocculant
  • Polymeric aluminum-iron-magnesium composite flocculant for treating dye wastewater, and preparation method of polymeric aluminum-iron-magnesium composite flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stir until the solution is clear and transparent, add 2g of ferric sulfate, and continue stirring until the solution is clear and transparent; put the above solution into a reactor with a stirring and reflux device, and heat slowly to 70°C and keep the temperature basically constant, then dropwise add 0.8mL of 85wt% phosphoric acid solution, and stir for 10min at a speed of 90r / min; keep the temperature of the previous step basically constant, add 1.2g of magnesium oxide to the reactor, adjust The stirring speed of the reactor is 160r / min. After the solid dissolves completely, slowly add sodium carbonate solid until the pH=3 of the solution; keep the temperature in the previous step unchanged, and adjust the stirring speed of the reactor to be 120r / min. Insulate for 4 hours, take out the liquid in the reactor, let it stand and cool to room temperature, and obtain the polymerized aluminum-iron-ma...

Embodiment 2

[0033]Dissolve 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stir until the solution is clear and transparent, add 2g of ferric sulfate, and continue stirring until the solution is clear and transparent; put the above solution into a reactor with a stirring and reflux device, and heat slowly to 90°C and keep the temperature basically constant, then dropwise add 0.8mL of 85wt% phosphoric acid solution, and stir for 10min at a speed of 120r / min; keep the temperature of the previous step basically constant, add 0.8g of magnesium oxide to the reactor, adjust The stirring speed of the reactor is 200r / min. After the solid is completely dissolved, slowly add sodium carbonate solid until the pH of the solution=3; keep the temperature in the previous step unchanged, adjust the stirring speed of the reactor to 150r / min, and keep the reactor warm After 2 hours, the liquid in the reactor was taken out, allowed to stand and cooled to room temperature, and the polymeriz...

Embodiment 3

[0037] Dissolve 20g of aluminum sulfate octadecahydrate in 25mL of distilled water, stir until the solution is clear and transparent, add 2g of ferric sulfate, and continue stirring until the solution is clear and transparent; put the above solution into a reactor with a stirring and reflux device, and heat slowly to 80°C and keep the temperature basically constant, then dropwise add 0.8mL of 85wt% phosphoric acid solution, and stir for 10min at a speed of 100r / min; keep the temperature of the previous step basically constant, add 0.8g of magnesium oxide to the reactor, adjust The stirring speed of the reactor is 180r / min. After the solid is completely dissolved, slowly add sodium carbonate solid until the pH of the solution=2.5; keep the temperature in the previous step unchanged, adjust the stirring speed of the reactor to 135r / min, and keep the reactor warm 3h, take out the liquid in the reactor, let it stand and cool down to room temperature, and obtain the polymerized alum...

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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, dissolving, then adding the solution into a reactor, heating to 70-90 DEG C, then adding a phosphoric acid solution, and stirring for a periodof time; keeping the temperature at 70-90 DEG C, adding magnesium oxide, stirring and dissolving, and adjusting the pH value to be acidic; and keeping the temperature at 70-90 DEG C, carrying out a thermal-insulation stirring reaction for a period of time, 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 10-500 mg / L and the pH value of 7-12.5, the dye removal rate can reach 98% or above; and the composite flocculant prepared by the method is used for treating a direct blue 2B dye solution with the concentration of 10-500 mg / L and the pH of 7-12.5 is treated, the dye removal rate can reach 99% or above.

Description

technical field [0001] The invention belongs to the technical field of flocculant preparation, and in particular relates to a polymerized aluminum-iron-magnesium composite flocculant for treating dye wastewater and a preparation method thereof. Background technique [0002] Printing and dyeing wastewater is a general term for the mixing of various wastewater discharged during the production process of printing and dyeing enterprises. Printing and dyeing wastewater is a typical high-concentration, high-chroma, refractory organic industrial wastewater, which contains a large amount of dyes, additives, slurry, acid and alkali, fiber impurities and inorganic salts, etc., not only has a complex composition, large fluctuations in water quality and water volume, Moreover, heavy metal elements such as nitro, amino compounds and copper, chromium, zinc, arsenic have greater biological toxicity, and it is very difficult to handle. For a long time, printing and dyeing wastewater has be...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/30C02F101/30
CPCC02F1/5236C02F2103/30C02F2101/308
Inventor 蔡卫权陈俊武
Owner GUANGZHOU UNIVERSITY
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