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Novel method for preparing polysilicate flocculant

A technology of polysilicate and flocculant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of low practical value, shortened storage period, and failure of flocculant, and achieves good application prospects, simple synthesis method, Good flocculation effect

Inactive Publication Date: 2012-06-20
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the late 1930s, Baylis proposed that polysilicic acid formed after water glass was neutralized by acid had a flocculation effect, but due to the instability and anionic properties of polysilicic acid, the practical value was not high.
[0005] The preparation of polysilicic acid is a key step in the preparation process of this method. If the dropping concentration and dropping speed are not well controlled, the polysilicic acid will easily appear viscous or solid gel, which will cause the preparation process to fail.
In addition, the polysilicate flocculant prepared by this method has a short storage period, and with the increase of silica content, the storage period shortens rapidly, making the flocculant ineffective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 5.06 grams of ZnSO to a 200ml beaker 4 ·7H 2 O, add 60ml of water, stir to dissolve. According to the zinc-silicon ratio being 1, the required mass of sodium silicate is calculated to be 5.00 grams. Add 5.00 g of sodium silicate to another 200 ml beaker, stir and dissolve with 35 ml of water. Then, the sodium silicate solution was added dropwise to the zinc sulfate solution under stirring conditions to form a white precipitate of zinc silicate. After the reaction is completed, add 5-6 milliliters of 6 mol / liter sulfuric acid solution to adjust the pH to 2, and continue to stir the solution for activation. The activation time is 1 hour. The reaction solution obtained at this time is a polysilicate zinc polysilicate flocculant with a silicon dioxide content of 1% (mass percentage), Zn / Si=1 (molar ratio), and the solution is clear liquid.

Embodiment 2

[0016] Add 10.12 grams of ZnSO to a 200ml beaker 4 ·7H 2 O, add 60ml of water, stir to dissolve. According to the zinc-silicon ratio being 1, the required mass of sodium silicate is calculated to be 10.00 grams. Add 10.00 g of sodium silicate to another 200 ml beaker, stir and dissolve with 25 ml of water. Then, the sodium silicate solution was added dropwise to the zinc sulfate solution under stirring conditions to form a white precipitate of zinc silicate. After the reaction is complete, add 12-13 milliliters of 6 mol / liter sulfuric acid solution to adjust the pH to 2, and continue to stir the solution for activation. The activation time is 1 hour. The reaction solution that obtains now is the polysilicate zinc flocculant that silicon dioxide content is 2% (mass percentage), Zn / Si=1 (molar ratio), and the solution is light milky white, and after standing for a period of time, the bottom of the container has A small amount of white precipitate.

Embodiment 3

[0018] Add 40.48 grams of ZnSO to a 200ml beaker 4 ·7H 2 O, add 50ml of water, stir to dissolve. According to the ratio of zinc to silicon being 2, the required mass of sodium silicate is calculated to be 20.00 grams. Add 20.00 g of sodium silicate to another 200 ml beaker, stir and dissolve with 50 ml of water. Then, the sodium silicate solution was added dropwise to the zinc sulfate solution under stirring conditions to form a white precipitate of zinc silicate. After the reaction was completed, 25 milliliters of 6 mol / liter sulfuric acid solution was added to adjust the pH to 2, and the solution was continuously stirred for activation, and the activation time was 2 hours. The reaction solution obtained at this time is a polysilicate zinc polysilicate flocculant with a silicon dioxide content of 3% (mass percentage) and Zn / Si=2 (molar ratio). The solution is milky white. After standing for a period of time, a certain amount of of white precipitate.

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Abstract

The invention relates to a method for synthesizing polysilicate flocculant, belonging to the field of the synthesis of flocculant. According to the method, the alkali metal silicate and the metal salt are used as synthesizing raw materials, the sodium silicate solution is prepared according to the concentration (weight percentage content) of the silica, the mass of the needed metal salt is calculated according to the molar ratio of corresponding metal and silicon and the metal salt solution is prepared, the silicic acid and metal salt is synthesized, the acid is added to adjust the pH value, and the activation is carried out to obtain the polysilicate flocculant. The polysilicate flocculant prepared by adopting the method has the advantages of easy polymerization, large alum, high settling speed and the like. The settling time of the polysilicate flocculant prepared by the method is longer than that of the polysilicate flocculant prepared by adopting the general method.

Description

technical field [0001] The invention relates to a synthesis method of a polysilicate flocculant, belonging to the field of flocculant synthesis. Background technique [0002] Flocculants are important chemical reagents that are widely used in the water treatment industry. Inorganic polymer flocculants, such as polyaluminum and polyferron, have the advantages of low cost, less dosage, and low pollution compared with traditional flocculants, and are widely used in water treatment, industrial wastewater, urban sewage treatment, etc. . In the late 1930s, Baylis proposed that polysilicic acid formed after water glass was neutralized by acid had a flocculation effect, but because polysilicic acid has instability and anionic properties, its practical value is not high. Polysilicate coagulant can be obtained by introducing metal ions into polysilicate in a certain way. The added metal ions can not only prevent or slow down the zeta potential of the silica gel solution, enhance th...

Claims

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Application Information

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IPC IPC(8): C01B33/20C02F1/52
Inventor 王雪枫黄雪莉程伟
Owner XINJIANG UNIVERSITY
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