Preparation method of polysilicate metal salt-hollow porous silicon dioxide composite flocculant used for water treatment

A technology of porous silica and polysilicate metal salt, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Good, limited adsorption, etc., to achieve the effect of enhancing the adsorption bridging effect, facilitating the precipitation of flocs, and improving the quality of effluent water

Inactive Publication Date: 2020-10-13
陈超
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limited adsorption of polysilicate to colloidal particles, the first impact is that the colloidal particles in the water cannot be fully adsorbed, which affects the adsorption and bridging of polysilicate to colloidal particles, resulting in polysilicate The flocculation effect on colloidal particles is reduced; the second is that the flocs formed by the colloidal particles adsorbed by silicate have poor compactness, which will cause the flocs to fail to settle to the bottom of the water, and it is difficult to separate the flocs from the water

Method used

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  • Preparation method of polysilicate metal salt-hollow porous silicon dioxide composite flocculant used for water treatment
  • Preparation method of polysilicate metal salt-hollow porous silicon dioxide composite flocculant used for water treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The preparation method of hollow porous silica composite microsphere comprises the following steps:

[0029] a) Mix ethylene glycol and distilled water in a ratio of 1:1 to obtain a mixed solution, add sodium hydroxide and cetyltrimethylammonium bromide to the mixed solution, sodium hydroxide, cetyltrimethylammonium The mass ratio of ammonium bromide and the mixed solution is 0.2:1:20, heat in a water bath to 75°C, then add tetraethyl orthosilicate, tetraethyl orthosilicate and hexadecyltrimethylammonium bromide The mass ratio is 1:0.2, stirred and reacted for 7 hours, centrifuged, washed, and dried to obtain a hollow porous silica matrix, and the hollow porous silica matrix was calcined at 650°C for 3 hours in a muffle furnace to obtain a hollow porous silica;

[0030] b) Add salicylic acid and epichlorohydrin to 1,2-dichloroethane solvent, the mass ratio of salicylic acid to epichlorohydrin is 1:1.5, salicylic acid and 1,2-dichloroethane The mass ratio is 1:30, the ...

Embodiment 2

[0037] The preparation method of hollow porous silica composite microsphere comprises the following steps:

[0038] a) Mix ethylene glycol and distilled water in a ratio of 1:1 to obtain a mixed solution, add sodium hydroxide and cetyltrimethylammonium bromide to the mixed solution, sodium hydroxide, cetyltrimethylammonium The mass ratio of ammonium bromide and the mixed solution is 0.2:1:20, heat it in a water bath to 65°C, then add tetraethyl orthosilicate, tetraethyl orthosilicate and hexadecyltrimethylammonium bromide The mass ratio is 1:0.5, stirred and reacted for 5 hours, centrifuged, washed, and dried to obtain a hollow porous silica matrix, and the hollow porous silica matrix was placed in a muffle furnace and calcined at 600°C for 6 hours to obtain a hollow porous silica matrix. silica;

[0039] b) Add salicylic acid and epichlorohydrin to 1,2-dichloroethane solvent, the mass ratio of salicylic acid to epichlorohydrin is 1:1.5, salicylic acid and 1,2-dichloroethane ...

Embodiment 3

[0046] The preparation method of hollow porous silica composite microsphere comprises the following steps:

[0047] a) Mix ethylene glycol and distilled water in a ratio of 1:1 to obtain a mixed solution, add sodium hydroxide and cetyltrimethylammonium bromide to the mixed solution, sodium hydroxide, cetyltrimethylammonium The mass ratio of ammonium bromide and the mixed solution is 0.2:1:20, heat it in a water bath to 70°C, then add tetraethyl orthosilicate, tetraethyl orthosilicate and hexadecyltrimethylammonium bromide The mass ratio is 1:0.3, stirred and reacted for 8 hours, centrifuged, washed, and dried to obtain a hollow porous silica matrix. The hollow porous silica matrix was placed in a muffle furnace and calcined at 630°C for 5 hours to obtain a hollow porous silica matrix. silica;

[0048] b) Add salicylic acid and epichlorohydrin to 1,2-dichloroethane solvent, the mass ratio of salicylic acid to epichlorohydrin is 1:2, salicylic acid and 1,2-dichloroethane The m...

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Abstract

The invention relates to the technical field of flocculants, and discloses a preparation method of a polysilicate metal salt-hollow porous silicon dioxide composite flocculant used for water treatment. The preparation method comprises the following steps: 1) preparing a sodium silicate solution, and adjusting the pH value of the sodium silicate solution to 3.0-4.0 for later use; 2) adding hollow porous silicon dioxide composite microspheres into the solution obtained in the step 1), carrying out uniform stirring and mixing, and then successively conducting stirring, curing and standing to obtain a composite polysilicic acid solution; and 3) weighing aluminum sulfate octadecahydrate and calcium chloride dihydrate in proportion, adding the weighed substances into distilled water, carrying out stirring and dissolving to obtain a mixed solution, dropwise adding the mixed solution into the composite polysilicic acid solution obtained in the step 2), and successively conducting stirring, curing and standing to obtain the polysilicate metal salt-hollow porous silicon dioxide composite flocculant. The flocculant prepared by the method has an excellent flocculation effect on impurity particles in water, and formed flocs are good in compactness and convenient to separate and operate.

Description

technical field [0001] The invention relates to the technical field of flocculants, in particular to a method for preparing a polysilicate metal salt-hollow porous silica composite flocculant for water treatment. Background technique [0002] The flocculant mainly refers to adding chemicals to the water, and the groups with positive (negative) charges and some particles or particles with negative (positive) charges in the water that are difficult to separate are close to each other, reducing their potential, so that the colloidal particles are in the Destabilized state, so as to achieve the purpose of water purification. Therefore, the chemicals generally used to achieve this purpose are called flocculants. Flocculants are used in food and beverage, mining, dyes, textiles, fermentation, etc. Flocculants can be roughly divided into four categories, inorganic salt flocculants, organic salt flocculants, microbial flocculants and composite flocculants. Inorganic low-molecular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 陈超
Owner 陈超
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