Organic-inorganic composite flocculant and its preparing process

A production method and composite technology, applied in separation methods, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high moisture content of waste residue, more scum generation, and large volume of sewage liquid, etc. The production process is simple, the production cycle is short, and the reaction is mild.

Inactive Publication Date: 2005-03-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of flocculant can effectively disinfect, sterilize, and purify wastewater, it has the disadvantages of large dosage, low efficiency, and more scum.
The main varieties of organic polymer flocculants are polyacrylamide (PAM), polymethacrylate-acrylonitrile copolymer, polyester polyamine, polyvinyl benzyl quaternary ammonium salt, etc., which are combined with inorganic polymer flocculants Compared with it, it has the advantages of small dosage, strong flocculation ability, high efficiency, and less scum generation, but the disadvantage is that the waste residue has a high moisture content and the generated sewage volume is relatively large

Method used

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  • Organic-inorganic composite flocculant and its preparing process
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  • Organic-inorganic composite flocculant and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The raw material of this embodiment and formula (mass fraction) thereof:

[0055] Aluminum Sulfate 10%

[0056] Calcium Chloride 15%

[0057] Dicyandiamide 5%

[0058] Formaldehyde 5%

[0059] water balance

[0060] Process steps and process parameters of the present embodiment:

[0061] The processing steps and sequence of the present embodiment are as figure 1 As shown, each process step is carried out under normal pressure.

[0062] (1) Hydrolysis reaction

[0063] Add the required water into the reaction kettle, the water temperature is controlled at 60°C, and then add aluminum sulfate under stirring. When the aluminum sulfate is dissolved, test the pH value of the solution, and adjust the pH value to 2.5 with hydrochloric acid or sodium hydroxide.

[0064] (2) Polymerization reaction

[0065] Calcium chloride is added to the above hydrolyzate under stirring, then the temperature is raised to 95° C. and water glass with a mass fraction of 1.0% is added to pr...

Embodiment 2

[0069] The raw material of this embodiment and formula (mass fraction) thereof:

[0070] Aluminum Chloride 20%

[0071] Dicyandiamide 10%

[0072] Formaldehyde 10%

[0073] water balance

[0074] Process steps and process parameters of the present embodiment:

[0075] The processing steps and sequence of the present embodiment are as figure 2 As shown, each process step is carried out under normal pressure.

[0076] (1) Polycondensation reaction

[0077] Add the required water into the reaction kettle, control the water temperature at 100°C, add formic acid to adjust the pH value of the water to 1.5, then add dicyandiamide under stirring, add formaldehyde after it is dissolved, and keep it warm at 100°C for 4 hours. Complete the polycondensation reaction.

[0078] (2) Hydrolysis and polymerization reaction

[0079] Add aluminum chloride to the solution obtained by the polycondensation reaction under stirring, then lower the temperature of the solution to 80°C and keep...

Embodiment 3

[0081] The raw material of this embodiment and formula (mass fraction) thereof:

[0082] Aluminum Chloride 15%

[0083] Dicyandiamide 8%

[0084] Formaldehyde 10%

[0085] water balance

[0086] Process steps and process parameters of the present embodiment:

[0087] The processing steps and sequence of the present embodiment are as image 3 As shown, each process step is carried out under normal pressure.

[0088] (1) Hydrolysis reaction

[0089] Add the required water into the reaction kettle, control the water temperature at 90°C, add industrial concentrated sulfuric acid to adjust the pH value of the water to 1.0, then add aluminum chloride under stirring, and the hydrolysis solution will be obtained after the aluminum chloride dissolves.

[0090] (2) Polycondensation and polymerization reaction

[0091] Add dicyandiamide to the above hydrolysis solution under stirring, add formaldehyde at 1 hour of the dissolution reaction, and keep the reaction at 90°C for 7 hours...

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Abstract

A composite organic-inorganic flocculant with the merits of organic and inorganic flocculants especially suitable for treating the high-basicity and high-chromaticity sewage is prepared from the polymer of dicyanobiamine with formaldehyde, aluminium chloride polysulfide and / or aluminium calcium chloride polysulfide through hydrolysis reaction, polymerizing and polycondensation. Its advantages are simple process and no waste discharge.

Description

technical field [0001] The invention belongs to the field of flocculants, in particular to a flocculant for waste water treatment and a production method thereof. Background technique [0002] Flocculants have been widely used in wastewater treatment. As far as the existing flocculants are concerned, they can be divided into two categories: inorganic flocculants and organic flocculants according to their chemical composition. Among the inorganic flocculants, inorganic polymer flocculants are dominant, such as polysulfuric ferric chloride, polyphosphoric ferric chloride, polyferric silicate, polyferric phosphate and other iron salts and polyferric aluminum chloride, polysilicon Aluminum salt flocculants such as aluminum sulfate and aluminum polyphosphate sulfate. Although this type of flocculant can effectively disinfect, sterilize, and purify wastewater, it has disadvantages such as large dosage, low efficiency, and high scum generation. The m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D21/01C02F1/52
Inventor 刘明华周华龙龚宜昌
Owner FUZHOU UNIV
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