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Method for continuously producing high-cleanness silicon dioxide

A silicon dioxide and cleaning technology, which is applied in the direction of silicon oxide, pharmaceutical formulations, cosmetic preparations, etc., can solve the problems of toothpaste agglomeration, inability to effectively clean the tooth surface, poor stability, and uniformity, and achieve easy separation and wear values Low, consistent performance

Active Publication Date: 2014-04-30
ZHAOQING SANJIANG SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silica produced by this method has poor stability and uniformity, and it is easy to make the toothpaste agglomerate and cannot effectively clean the deposits on the tooth surface.

Method used

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  • Method for continuously producing high-cleanness silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) In a 30m 3 The amount of substance added to the continuous reactor is a sodium sulfate solution whose concentration n0 is 0.5 mol / L, and the volume of sodium sulfate added is 10 m 3 ;

[0027] 2) Add a sodium silicate solution with a substance concentration n1 of 1mol / L in the continuous reactor, and adjust the pH value of the reaction solution to 8;

[0028] 3) Keep the reaction temperature at 60°C, and at the same time add a sodium silicate solution with a substance concentration n1 of 1mol / L and a sulfuric acid solution with a substance concentration n2 of 1mol / L, and the volume of the added sodium silicate solution is 8 000L , the volume of the added sulfuric acid solution is 8000L;

[0029] The sodium silicate solution was added at a rate of 3 m 3 / h, the adding speed of sulfuric acid solution is 3m 3 / h;

[0030] 4) A precipitate and solution with a volume of 16,000L is released from the outlet below the continuous reactor, and the obtained precipitate is ...

Embodiment 2

[0033] 1) In a 30m 3 The amount of substance added to the continuous reactor is a sodium sulfate solution whose concentration n0 is 1mol / L, and the volume of sodium sulfate added is 10 m 3 ;

[0034] 2) Add a sodium silicate solution with a substance concentration n1 of 1.5mol / L in the continuous reactor, and adjust the pH value of the reaction solution to 8;

[0035] 3) Keep the reaction temperature at 60°C, and simultaneously add a sodium silicate solution with a substance concentration n1 of 1.5 mol / L and a sulfuric acid solution with a substance concentration n2 of 3 mol / L, and the volume of the added sodium silicate solution is 8 000L, the volume of the added sulfuric acid solution is 4000L;

[0036] The sodium silicate solution was added at a rate of 3m 3 / h, the adding speed of sulfuric acid solution is 1.5m 3 / h;

[0037] 4) While step 3) is being carried out, a precipitate is formed in the reactor, and the mixture of the precipitate and the reaction solution is r...

Embodiment 3

[0040] 1) In a 30m 3 Add the sodium sulfate solution whose concentration n0 is 0.8mol / L in the continuous reactor, and the volume of sodium sulfate added is 10 m 3 ;

[0041] 2) Add a sodium silicate solution with a substance concentration n1 of 1.2mol / L in the continuous reactor, and adjust the pH value of the reaction solution to 8;

[0042] 3) Keep the reaction temperature at 60°C, and simultaneously add a sodium silicate solution with a substance concentration n1 of 1.2mol / L and a sulfuric acid solution with a substance concentration n2 of 2.4mol / L, and the volume of the added sodium silicate solution is 8 000L, the volume of the added sulfuric acid solution is 4000L;

[0043] The sodium silicate solution was added at a rate of 6 m 3 / h, the adding speed of sulfuric acid solution is 3m 3 / h;

[0044] 4) While step 3) is being carried out, a precipitate is formed in the reactor, and the mixture of the precipitate and the reaction solution is released from the outlet be...

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Abstract

The invention relates to a method for continuously producing high-cleanness silicon dioxide. The method comprises the following steps: (1) a sodium sulfate solution V0 of which the amount-of-substance concentration n0 is 0.5 to 1 mol / L is added into a continuous reactor; (2) a sodium silicate solution of which the amount-of-substance concentration n1 is 1 to 1.5 mol / L is added into the continuous reactor, and the pH value of a reaction liquid is regulated to 8 to 10; (3) a reaction system is kept at 59 to 61 DEG C, at the same time, the sodium silicate solution of which the amount-of-substance concentration n1 is 1 to 1.5 mol / L and the sulfuric acid solution with the amount-of-substance concentration n2 are added, the volume of the added sodium silicate solution is V1, the volume of the added sulfuric acid solution is V2, the V1, V2, n1, n2 and V0 satisfy the following three relational expressions: V1*n1=V2*n2; (V1*n1) / (V1+V2)=no; n0<n1; (4) precipitation and solutions of which the volume is V1+V2 are discharged from an outlet below the continuous reactor, and the obtained precipitation is filtered, washed and dried to obtain silicon dioxide. By using the method, the silicon dioxide with stable properties can be produced continuously, the obtained silicon dioxide can be used in toothpastes, and teeth can be effectively cleaned.

Description

technical field [0001] The invention relates to the field of silicon dioxide, in particular to a method for continuously producing high-clean silicon dioxide. Background technique [0002] When people eat, various deposits, including bacterial film, are easily produced on the tooth surface. Bacteria often contain brown or yellow pigments, which not only make the teeth unsightly, but may also cause some oral diseases. Therefore, it is of great practical significance to remove deposits on the tooth surface. In order to effectively clean the deposits on the tooth surface, abrasives are added to the toothpaste, and silicon dioxide is one of the abrasives. [0003] In the prior art, by adding a certain proportion of sodium silicate and concentrated sulfuric acid into the reactor for direct reaction, the reacted material is cooled and pumped into a filter press for filtration, washing and drying. Make the solid-liquid two-phase reach a certain ratio, and the filter cake is subj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113A61K8/25A61Q11/00
Inventor 王宪伟庹文喜崔昀
Owner ZHAOQING SANJIANG SILICON MATERIALS CO LTD
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