Method for preparing superfine silicon dioxide powder using sulfuric acid precipitation reaction

A technology of ultra-fine silica and precipitation reaction, applied in the direction of silica, silica, etc., to achieve the effect of high industrial production value, shortened time and uniform particle size distribution

Inactive Publication Date: 2006-05-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem of sulfuric acid addition speed matching control when using a supergravity reactor for sulfuric acid precipitation re

Method used

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  • Method for preparing superfine silicon dioxide powder using sulfuric acid precipitation reaction
  • Method for preparing superfine silicon dioxide powder using sulfuric acid precipitation reaction
  • Method for preparing superfine silicon dioxide powder using sulfuric acid precipitation reaction

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Embodiment 1

[0032] Such as figure 1 As shown: this embodiment adopts the rotating bed supergravity field device (Chinese patent 00132275.3) developed by the applicant, the rotating packing layer 4 is driven by the motor 1, the rotating speed is regulated by the frequency regulator, and sulfuric acid is continuously added during the cycle to form a continuous cycle reaction. According to water glass: water=1: 7 (volume ratio) ratio preparation specific gravity is 10 liters of sodium silicate solution of 6.6 ° Be ', adds 150gNaCl after filtering to remove impurity, and is stirred to make it dissolve completely. Add the prepared feed liquid into the liquid holding tank 5 with the stirring paddle 6, heat the heating tube 8 and keep stirring, after the temperature rises to 90°C and stabilizes, start the feed liquid circulation pump, adjust the rotating bed speed to 900rpm, The material-liquid circulation pump enters the liquid circulation pipeline, and enters the inner cavity of the rotating...

Embodiment 2

[0034] Except for the following changes, all the other conditions were the same as in Example 1.

[0035] The rotation speed of the rotating bed is 1200rpm, the acid addition time is controlled within 3 minutes, the reaction time is 8 minutes, the average particle size of the primary particles of the product is 8 nanometers, and the specific surface area BET=307m 2 / g, bulk density is 0.12g / cm 3 .

Embodiment 3

[0037] Except for the following changes, all the other conditions were the same as in Example 1.

[0038] The concentration of sulfuric acid is 40%, the volume flow ratio of feed liquid and sulfuric acid is 200:1, and the acid addition time is controlled within 3 minutes, and the reaction time is 10 minutes. The average particle diameter of the primary particles of the product is 14 nanometers, and the specific surface area BET=210m 2 / g, bulk density is 0.178g / cm 3 .

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Abstract

The invention provides a method for preparation of superfine silica flour. The process contains the following: using sodium silicate and sulphuric acid as the raw material, precipitating in the rotary filler layer of hypergravity reactor, controlling the acid-loading speed and the rotary-bed rotary-speed to match with the precipitation speed and produce non gel, and then conventionally post-treating the reacted feed liquid to produce superfine silica flour. Compared with traditional sulfuric acid process, the reaction time shortens to 20 minutes from 2 hours, and the mean particle diameter of prepared silica flour is about 5-25nm.

Description

technical field [0001] The invention relates to a method for preparing superfine silicon dioxide powder by sulfuric acid precipitation reaction, in particular to a method for preparing superfine silicon dioxide powder by precipitation reaction in a supergravity reactor. Background technique [0002] There are many traditional production methods for silica powder, such as the carbonization method, which uses water glass and carbon dioxide as raw materials to carry out carbonization reactions, and undergoes processes such as acidification, aging, precipitation, and filtration; this method has a long reaction time (4-5 hours) ), the particles are large, and the particle size distribution is uneven; at present, another mature method for preparing silica powder that is more practical for industrial production at home and abroad is the sulfuric acid precipitation method. This method uses water glass and sulfuric acid as raw materials to carry out precipitation reaction first. Afte...

Claims

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Application Information

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IPC IPC(8): C01B33/113C01B33/18
Inventor 郭锴郭奋陈建峰赵柄国
Owner BEIJING UNIV OF CHEM TECH
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