Preparation method and application method of silicon dioxide cluster-based novel settling agent

A technology of silicon dioxide and sedimentation agent, applied in the directions of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problems of beneficial water biological hazards, high residual metal ion content, destroying ecological balance, etc., and inhibit the growth of cyanobacteria. , Reduce the residual amount, the effect of adjustable density

Pending Publication Date: 2018-07-06

合肥星巢环保科技有限公司

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Problems solved by technology

But these inorganic salt flocculants also have the following disadvantages: 1) the residual content of metal ions in the water body after the existing flocculant treatment is high, causing secondary pollution, especially aluminum ions, which can cause stomach problems, kidney diseases, and nervous system diseases

2) The flocs produced by the existing flocculants have low density and often float on...

Abstract

The invention discloses a preparation method and an application method of a silicon dioxide cluster-based novel settling agent. Silicon dioxide clusters serve as settling agent main bodies, and metalions and the silicon dioxide clusters are combined by utilizing the strong interaction between the silicon dioxide clusters and the metal ions, so that a metal ion modified settling agent is obtained,and the content of metal ion residues such as aluminum ions in the treated water body can be reduced; the settling agent provided by the invention can be selectively combined with blue-green algae, so the influence on other aquatic organisms is greatly reduced; the density of the final settling material can be adjusted by adjusting the polymerization degree or grain size of the silicon dioxide clusters in the settling agent and the metal content, the prepared settling material can float on the water surface and also can sink into the water bottom, and different salvage treatment requirementscan be met; and the settling agent provided by the invention is faintly acidic, so the living environment of the blue-green algae can be broken by a mode of reducing the pH value of the water body while the blue-green algae are settled, and the growth of the blue-green algae can be inhibited.

Application Domain

SilicaAlkali metal silicates +2

Technology Topic

ChemistryCluster based +12

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Examples

Experimental program(3)

Example Embodiment

[0034] Example 1

[0035] A method for preparing a new type of sedimentation agent based on silica clusters. The silica clusters are used as the main body of the sedimentation agent. The strong interaction between the silica clusters and metal ions is used to combine the metal salt aqueous solution with The aqueous solution of the silica clusters is fully mixed to obtain a uniform solution of the metal salt modified settling agent, that is, a new type of settling agent is obtained;

[0036] The silica clusters adopt an aqueous solution of silica particles;

[0037] The density or size of the silica clusters can be adjusted, and the degree of polymerization can be adjusted by the method of standing and aging at a certain temperature, thereby adjusting the density or size.

[0038] Specific steps are as follows:

[0039] (1) Preparation of silica particle aqueous solution:

[0040] Add 50g of elemental silicon powder into 100mL of water, heat to 98°C, stir for 30min, and dissolve 0.4g of sodium hydroxide in 200mL of water, slowly add the sodium hydroxide solution to the above-mentioned silicon powder suspension, maintaining the temperature Continue to stir for 20 hours, then cool to room temperature under stirring conditions, and let it stand for 12 hours, and then vacuum filter to separate the residual solid from the liquid. The resulting liquid contains 20-30% silica, and the pH of the liquid is greater than 8; The resulting solution is ion-exchanged with acidic cation exchange resin at a liquid flow rate of 10 mL/min to obtain a weakly acidic silica particle solution;

[0041] Afterwards, the obtained silica particle solution was kept at a temperature of 80° C. for 24 hours, and then subjected to aging treatment.

[0042] (2) Modification of silica clusters with iron ions:

[0043] Adjust the pH of the silica clusters to 7.5 through the method of ion exchange column, or directly add acid (such as hydrochloric acid) or alkali (such as sodium hydroxide), and then add iron chloride (FeCl 3 ) The aqueous solution is quickly added to the adjusted silica cluster solution, and stirred at room temperature for 5-90 minutes to form a uniform and transparent solution. Among them, silicon dioxide and ferric chloride (SiO 2 /FeCl 3 ) The mass ratio is between 10-80, and finally the chloride ion (Cl - ) Remove;

[0044] The silica clusters modified with iron ions are distilled, concentrated, and aged; the aging condition is a temperature of 50° C., and the temperature is kept standing for 10 hours. . The iron-containing settling agent does not contain aluminum ions.

Example Embodiment

[0045] Example 2

[0046] A method for preparing a new type of sedimentation agent based on silica clusters. The silica clusters are used as the main body of the sedimentation agent. The strong interaction between the silica clusters and metal ions is used to combine the metal salt aqueous solution with The aqueous solution of the silica clusters is fully mixed to obtain a uniform solution of the metal salt modified settling agent, that is, a new type of settling agent is obtained;

[0047] The silica clusters adopt an aqueous solution of silica particles;

[0048] The density of the silica clusters is adjustable, and the degree of polymerization can be adjusted by the method of standing and aging at a certain temperature, thereby adjusting the density.

[0049] Specific steps are as follows:

[0050] (1) Preparation of silica particle aqueous solution:

[0051] Add 50g of elemental silicon powder into 100mL of water, heat to 98°C, stir for 30min, and dissolve 0.4g of sodium hydroxide in 200mL of water, slowly add the sodium hydroxide solution to the above-mentioned silicon powder suspension, maintaining the temperature Continue to stir for 20 hours, then cool to room temperature under stirring conditions, and let it stand for 12 hours, and then vacuum filter to separate the residual solid from the liquid. The resulting liquid contains 20-30% silica, and the pH of the liquid is greater than 8; The resulting solution is ion-exchanged with acidic cation exchange resin at a liquid flow rate of 10 mL/min to obtain a weakly acidic silica particle solution;

[0052] Afterwards, the obtained silica microparticle solution was kept at a temperature of 50° C. for 5 hours after being kept for aging treatment.

[0053] (2) Modification of silica clusters with aluminum ions:

[0054] Adjust the pH of the silica clusters to 2-4 through the ion exchange column method, and then add aluminum chloride (AlCl 3 ) The aqueous solution is quickly added to the adjusted silica cluster solution, and stirred at room temperature for 5-90 minutes to form a uniform and transparent solution or a uniform and stable suspension. Among them, silicon dioxide and aluminum chloride (SiO 2 / AlCl 3 ) The mass ratio is between 10-80, and finally the chloride ion (Cl - ) Remove;

[0055] The silica clusters modified by aluminum ions are distilled, concentrated, and aged; the aging condition is a temperature of 50° C., and the temperature is kept for 8 hours.

Example Embodiment

[0056] Example 3

[0057] A method for preparing a new type of sedimentation agent based on silica clusters. The silica clusters are used as the main body of the sedimentation agent. The strong interaction between the silica clusters and metal ions is used to combine the metal salt aqueous solution with The aqueous solution of the silica clusters is fully mixed to obtain a uniform solution of the metal salt modified settling agent, that is, a new type of settling agent is obtained;

[0058] The silica clusters adopt an aqueous solution of silica particles;

[0059] The density of the silica clusters is adjustable, and the degree of polymerization can be adjusted by the method of standing and aging at a certain temperature, thereby adjusting the density.

[0060] Specific steps are as follows:

[0061] (1) Preparation of silica particle aqueous solution:

[0062] Add 50g of elemental silicon powder into 100mL of water, heat to 98°C, stir for 30min, and dissolve 0.4g of sodium hydroxide in 200mL of water, slowly add the sodium hydroxide solution to the above-mentioned silicon powder suspension, maintaining the temperature Continue to stir for 20 hours, then cool to room temperature under stirring conditions, and let it stand for 12 hours, and then vacuum filter to separate the residual solid from the liquid. The resulting liquid contains 20-30% silica, and the pH of the liquid is greater than 8; The resulting solution is ion-exchanged with acidic cation exchange resin at a liquid flow rate of 10 mL/min to obtain a weakly acidic silica particle solution;

[0063] Afterwards, the obtained silica microparticle solution was kept at a temperature of 50° C. for 5 hours after being kept for aging treatment.

[0064] (2) Modification of silica clusters with iron ions:

[0065] Adjust the pH of the silica clusters to 7.5 through the method of ion exchange column, and then the iron chloride (FeCl 3 ) The aqueous solution is quickly added to the adjusted silica cluster solution, and stirred at room temperature for 5-90 minutes to form a uniform and transparent solution. Among them, silicon dioxide and ferric chloride (SiO 2 /FeCl 3 ) The mass ratio is between 10-80, and finally the chloride ion (Cl - ) Remove;

[0066] The silica clusters modified with iron ions are distilled, concentrated, and aged; the aging condition is a temperature of 50° C., and the temperature is kept for 8 hours.

[0067] After the cyanobacteria water body is treated with the iron-containing sedimentation agent, the water body contains no other ions except a small amount of iron ions.

[0068] After using a commercial flocculant and the aluminum-containing precipitant of Example 2 of the present invention to carry out the implementation of the cyanobacteria-containing water body, the aluminum content in the water body is measured and compared, and the results are shown in figure 1.

[0069] It can be seen from the figure that the commercial flocculant has high aluminum content and high absorbance after use. Plasma emission spectroscopy (ICP) testing shows that the content of aluminum ions introduced by the settling agent of the present invention is only 1/2 of that of commercial use.

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Preparation method and application method of silicon dioxide cluster-based novel settling agent

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Abstract

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Description & Claims & Application Information

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