Preparation method, product and application of inorganic-organic composite flocculant

A composite flocculant, organic technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, natural water treatment, etc. The effect of good flocculation treatment effect

Active Publication Date: 2021-09-21
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Flocculants can be divided into inorganic flocculants and organic flocculants. Inorganic flocculants have low flocculation ability due to their small relative molecular weight. When organic flocculants are used alone, the dehydration effect is not good enough and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing an inorganic-organic composite flocculant, comprising compounding inorganic polysilicate ferric sulfate and organic polyacrylamide, the preparation steps are as follows:

[0026] (1) Preparation of polysilicon ferric sulfate

[0027] Weigh ferric sulfate dissolved in water to make a 0.5 mol / L solution, add a small amount of concentrated sulfuric acid dropwise to it under constant stirring to inhibit hydrolysis, and then add polysilicate solution to the above solution dropwise, the polysilicate and ferric sulfate The ratio of silicon to iron is 1:1, stir well, adjust the pH to 2, and react at 40°C for 10 hours to obtain polysilicon ferric sulfate;

[0028] (2) Preparation of polyacrylamide

[0029] Weigh the acrylamide solution, add the initiator sodium bisulfite, the mass ratio of acrylamide to sodium bisulfite is 20:1, stir and mix evenly, and polymerize at 30°C for 12 hours to obtain polyacrylamide;

[0030] (3) Composite of polysilicon ferric...

Embodiment 2

[0034] A preparation method of an inorganic-organic composite flocculant, which is similar to the method of the embodiment, is prepared according to the following steps:

[0035] (1) Preparation of polysilicon ferric sulfate

[0036] Weigh ferric sulfate dissolved in water to make a 0.5 mol / L solution, add a small amount of concentrated sulfuric acid dropwise to it under constant stirring to inhibit hydrolysis, and then add polysilicate solution to the above solution dropwise, the polysilicate and ferric sulfate The ratio of silicon to iron is 2:1, stir well, adjust the pH to 3, and react at 45°C for 9 hours to obtain polysilicon ferric sulfate;

[0037] (2) Preparation of polyacrylamide

[0038] Weigh the acrylamide solution, add the initiator sodium bisulfite, the mass ratio of acrylamide to sodium bisulfite is 25:1, stir and mix evenly, and polymerize at 35°C for 11 hours to obtain polyacrylamide;

[0039] (3) Composite of polysilicon ferric sulfate and polyacrylamide

...

Embodiment 3

[0043] A preparation method of an inorganic-organic composite flocculant, which is similar to the method of the embodiment, is prepared according to the following steps:

[0044] (1) Preparation of polysilicon ferric sulfate

[0045] Weigh ferric sulfate dissolved in water to make a 0.5 mol / L solution, add a small amount of concentrated sulfuric acid dropwise to it under constant stirring to inhibit hydrolysis, and then add polysilicate solution to the above solution dropwise, the polysilicate and ferric sulfate The ratio of silicon to iron is 1:1, stir well, adjust the pH to 4, and react at 50°C for 8 hours to obtain polysilicon ferric sulfate;

[0046] (2) Preparation of polyacrylamide

[0047] Weigh the acrylamide solution, add the initiator sodium bisulfite, the mass ratio of acrylamide to sodium bisulfite is 30:1, stir and mix evenly, and polymerize at 40°C for 10 hours to obtain polyacrylamide;

[0048] (3) Composite of polysilicon ferric sulfate and polyacrylamide

...

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PUM

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Abstract

The present invention relates to a preparation method of an inorganic-organic composite flocculant and its product and application. The inorganic polysilicate ferric sulfate and organic polyacrylamide are composited, including: the preparation of polysilicon ferric sulfate, the preparation of polyacrylamide, and Composite of polysilicon ferric sulfate and polyacrylamide. The polysilicon ferric sulfate used in the present invention can neutralize the charge on the surface of colloidal particles and suspended matter, reduce the potential of the electric double layer, make the colloidal particles change from mutual repulsion to mutual attraction, and promote the mutual collision of colloidal particles, thereby accelerating flocculation settlement. However, polyacrylamide can effectively overcome the limited sweeping effect of polysilicon ferric sulfate due to its short molecular chain. It forms large flocs by bridging between particles, and removes tiny particles by sweeping. It has the advantages of less dosage, fast settling speed, good flocculation effect and simple preparation.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a preparation method of an inorganic-organic composite flocculant and its product and application. Background technique [0002] Flocculation plays an extremely important role in water treatment and is the most widely used and simplest method in water treatment. When the flocculant is formulated into an aqueous solution and added to the wastewater, a compressed electric double layer will be generated, which will destabilize the suspended particles in the wastewater, and the colloidal particles will coagulate with each other to increase the size of the particles, forming flocs and alum flowers. After the floc grows to a certain volume, it will separate from the water phase and settle under the action of gravity, thereby removing a large amount of suspended solids in the wastewater, thereby achieving the effect of water treatment. [0003] Flocculant can be divided into inorga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56C02F103/34
CPCC02F1/5236C02F1/56C02F2103/343
Inventor 何丹农代卫国童琴胡丹赵昆峰阳靖峰金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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