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Dextrin-modified polysilicon ferric sulfate composite flocculating agent and preparation method thereof

A polysilicon ferric sulfate and composite flocculant technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problem of not finding dextrin-modified polysilicon ferric sulfate composite flocculants, etc. Production and use, easy operation, good turbidity removal performance

Inactive Publication Date: 2014-04-30
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in the existing research on inorganic-organic composite flocculants, there are no relevant reports on dextrin-modified polysilicon ferric sulfate composite flocculants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Dissolve sodium silicate in distilled water and mix well to obtain a sodium silicate solution with a mass percentage concentration of 35%. Under stirring, add the sodium silicate solution dropwise to a sulfuric acid solution with a mass percentage concentration of 20%. , and then adjust the pH of the solution to 2 with sodium hydroxide solution to obtain a polysilicate solution;

[0027] (2) Dissolve ferrous sulfate in distilled water, heat to dissolve completely, and stir evenly to obtain a ferrous sulfate solution with a concentration of 25% by mass;

[0028] (3) Mix the polysilicic acid solution and the ferrous sulfate solution according to the Si:Fe molar ratio of 1, add 4.5ml of hydrogen peroxide with a mass ratio concentration of 30% under stirring, and mature at 45°C for 110min to obtain the mass The percentage concentration is 53% polysilicon ferric sulfate flocculant solution;

[0029] (4) Take 10mL of 53% polysilicon ferric sulfate in a beaker, and then a...

Embodiment 2

[0031] (1) Dissolve sodium silicate in distilled water and mix well to obtain a sodium silicate solution with a mass percentage concentration of 35%. Under stirring, add the sodium silicate solution dropwise to a sulfuric acid solution with a mass percentage concentration of 20%. , and then adjust the pH of the solution to 3 with sodium hydroxide solution to obtain a polysilicate solution;

[0032] (2) Dissolve ferrous sulfate in distilled water, heat to dissolve completely, and stir evenly to obtain a ferrous sulfate solution with a concentration of 25% by mass;

[0033] (3) Mix the polysilicic acid solution and ferrous sulfate solution according to the Si:Fe molar ratio of 1, add 4.5ml of hydrogen peroxide with a mass ratio concentration of 30% under stirring, and ripen at 48°C for 120min to obtain the mass The percentage concentration is 53% polysilicon ferric sulfate flocculant solution;

[0034] (4) Take 50mL of 53% polysilicon ferric sulfate in a beaker, and then add 10...

Embodiment 3

[0036] (1) Dissolve sodium silicate in distilled water and mix well to obtain a sodium silicate solution with a mass percentage concentration of 35%. Under stirring, add the sodium silicate solution dropwise to a sulfuric acid solution with a mass percentage concentration of 20%. , and then adjust the pH of the solution to 3 with sodium hydroxide solution to obtain a polysilicate solution;

[0037] (2) Dissolve ferrous sulfate in distilled water, heat to dissolve completely, and stir evenly to obtain a ferrous sulfate solution with a concentration of 25% by mass;

[0038] (3) Mix the polysilicic acid solution and the ferrous sulfate solution according to the Si:Fe molar ratio of 1, add 4.5ml of hydrogen peroxide with a mass ratio concentration of 30% under stirring, and mature at 50°C for 110min to obtain the mass The percentage concentration is 53% polysilicon ferric sulfate flocculant solution;

[0039] (4) Take 100mL of 53% polysilicon ferric sulfate in a beaker, and then ...

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Abstract

The invention discloses a dextrin-modified polysilicon ferric sulfate composite flocculating agent. The flocculating agent comprises polysilicon ferric sulfate and dextrin in the mass ratio of (3-250):1. A preparation method of the flocculating agent comprises the following steps of: (i) dissolving sodium silicate into water, mixing uniformly to obtain a sodium silicate solution, adding the sodium silicate solution into a sulfuric acid solution in a stirring state, and adjusting the pH value of the solution to 2-4 by using an alkali to obtain a polysilicic acid solution; (ii) preparing a ferrous sulfate solution, mixing the polysilicic acid solution and the ferrous sulfate solution in the molar ratio of Si and Fe being 1, adding an oxidation liquid in a stirring state, and curing to obtain polyferric silicate sulfate; and (iii) mixing the polyferric silicate sulfate and the dextrin in the abovementioned mass ratio, and stirring. The flocculating agent provided by the invention has the characteristics of high storage stability, high flocculating capability, high turbidity removing performance, high COD (Chemical Oxygen Demand) removing rate and the like; and moreover, a preparation process is simple, is convenient to operate and use, and can be widely applied to treatment of various industrial waste water.

Description

technical field [0001] The invention relates to a sewage treatment flocculant, in particular to a dextrin-modified polysilicon ferric sulfate composite flocculant and a preparation method thereof. Background technique [0002] The flocculation and sedimentation method is a widely used sewage purification treatment method, which mainly achieves the purpose of water purification by adding an appropriate amount of flocculant to the industrial wastewater, so that the flocculant and sewage suspended matter coagulate and settle. The quality of water purification depends to a large extent on the performance of flocculants. Therefore, the development of various high-performance flocculants is one of the main research hotspots in current sewage treatment. [0003] There are many kinds of flocculants, which are mainly divided into three categories: inorganic, organic and composite flocculants. Among them, the price of inorganic flocculants is relatively cheap, but the dosage is large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56
Inventor 路达赵春霞马建薇刘芃岩李占臣李政
Owner HEBEI UNIVERSITY
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