Method for preparing silica sol

A silica sol, sol technology, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., to achieve the effects of convenient operation, uniform particle size distribution, and low production cost

Inactive Publication Date: 2012-11-14
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the shortcomings of stirring and heating in the existing silica sol preparation process and make the silica sol particle size uniform, the invention provides a method for preparing silica sol

Method used

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  • Method for preparing silica sol
  • Method for preparing silica sol

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Effect test

Embodiment 1

[0037] (1) Get metal silicon powder (300 orders, purity is 99.9wt%) 1.3kg, 0.05kg sodium hydroxide and water 15kg are poured in the mixer, and heating steam is carried out material mixing and heating, and the flow rate of control hot steam is in 5L / min, the temperature of the hot steam is 110°C, the reaction temperature is controlled at 75°C, and the reaction is 4h to prepare the silica sol seed particle liquid;

[0038] (2) Take 10kg of the seed solution prepared in step (1) as the mother solution, add the reaction materials in batches, mix and heat the materials with hot steam, control the flow rate of the hot steam at 4L / min, and the temperature of the hot steam is 115°C , the reaction temperature is controlled at 80°C, and the following reaction materials are added in the first batch: a mixture of metal silicon powder 0.2kg, water 2kg, and sodium hydroxide 7g, and the feeding amount of each subsequent batch is higher than that of the previous batch Increase by 10%, feed to...

Embodiment 2

[0041] (1) Get metal silicon powder (200 mesh, purity is 90wt%) 1.5kg, 0.06kg sodium hydroxide and water 15kg are poured in the mixer, the heating steam carries out material mixing and heating, the flow velocity of control hot steam is in 5L / min, the temperature of the hot steam is 108°C, the reaction temperature is controlled at 70°C, and the reaction is carried out for 5h to prepare the silica sol seed particle liquid.

[0042] (2) Take 10kg of the seed liquid prepared in step (1) as the mother liquor, mix and heat the materials through hot steam, control the flow rate of the hot steam at 4L / min, the temperature of the hot steam is 115°C, and control the reaction temperature to 80 ℃, add the following reaction materials in the first batch: a mixture of metal silicon powder 0.3kg, water 2kg, and sodium hydroxide 8g, and the feeding amount of each batch is increased by 15% compared with the feeding amount of the previous batch. Feed to the 5th batch, and no more feed thereaft...

Embodiment 3

[0045] (1) Get metal silicon powder (200 mesh, purity is 95wt%) 2.0kg, 0.08kg sodium hydroxide and water 25kg are poured in the mixer, pass hot steam to carry out material mixing and heating, control the flow velocity of hot steam at 6L / min, the temperature of the hot steam is 115°C, the reaction temperature is controlled at 80°C, and the reaction is carried out for 4 hours to prepare the silica sol seed particle liquid.

[0046] (2) Take 15kg of the seed particle liquid prepared in step (1) as the mother liquor, mix and heat the material through hot steam, control the flow rate of the hot steam at 4L / min, the temperature of the hot steam is 121°C, and control the reaction temperature to 95 ℃, the following reaction materials are added in the first batch: a mixture of metal silicon powder 0.5kg, water 4kg, and sodium hydroxide 12g, and the feeding amount of each batch is increased by 20% compared with the feeding amount of the previous batch. Up to the 5th batch, thereafter n...

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Abstract

The invention discloses a method for preparing silica sol and belongs to the technical field of material preparation. The method comprises the following steps of: adding metal silica powder, alkali and deionized water into a mixer, and introducing hot steam for uniformly mixing and heating the materials to obtain silica sol seed particles; adding the prepared silica sol seed particles serving as mother solution into reaction materials by batches, and introducing hot steam for uniformly mixing and heating the materials; and after the reaction is finished, removing unreacted metal silica powderto obtain the silica sol. Heat is supplied from the bottom of a reaction kettle by introducing the hot steam, the heat of the hot steam is quickly and uniformly transferred to the whole reaction system through hot airflow, the defects of jacket heating are overcome, temperature difference cannot occur and the uniform growth of the silica sol seed particles and uniform increase of the particle size of the particles are facilitated. The steam is introduced for stirring, eddies cannot occur, the whole liquid surface is in the same plane, and the aggregation of the silica powder is avoided, so that concentration difference is avoided and the uniform increase of the particle size of the silica sol is ensured.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a method for preparing silica sol. Background technique [0002] The preparation methods of silica sol include elemental silica powder dissolution method, ion exchange method, electrolytic electrodialysis method, direct acidification method, peptization method, dispersion method and silicate hydrolysis method, etc. The industrially applied silica sol preparation methods are mainly ion exchange method and elemental silicon powder dissolution method. Among them, the elemental silicon dissolution method has become the main method for producing silica sol due to its advantages in process operation, silica sol purity and environmental protection. method. [0003] There are many reports on the preparation of silica sol by metal silica powder dissolution method. Patent CN86100503 provides a method for producing non-freezing silica sol belonging to the field of non-metalli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/14C01B33/141
Inventor 潘国顺顾忠华雒建斌路新春刘岩
Owner TSINGHUA UNIV
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