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Precipitated silicon dioxide with particle uniformity, preparation method and use of precipitated silicon dioxide

A technology of precipitated silica and silicon dioxide, applied in the direction of silica, silicon oxide, etc., can solve the problems that the preparation of precipitated silica cannot be realized, and achieve the effect of good fluidity and uniform particles

Active Publication Date: 2015-01-14
WUXI HENGCHENG SILICON IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, none of the existing technologies can achieve the preparation of precipitated silica with particle uniformity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for preparing precipitated silica with particle uniformity, the method comprising: making water glass and concentrated sulfuric acid to undergo a precipitation reaction, thereby obtaining a suspension of precipitated silica, and then undergoing press filtration, washing, slurrying and The suspension was dried, wherein the precipitation reaction was carried out as follows:

[0054] (1) preparation raw material liquid water glass, in described liquid water glass, water glass concentration is with Na 2 O is expressed as 2.35N

[0055] (2) adopt above-mentioned raw material liquid water glass, prepare the initial bottom material of precipitation reaction, wherein contain the part of the water glass total amount that uses in described precipitation reaction, in described initial bottom material, water glass concentration is with Na 2 O is expressed as 0.06N, and the pH is 9.0;

[0056] (3) Add vitriol oil and surplus water glass dropwise simultaneously in describe...

Embodiment 2

[0065] A method for preparing precipitated silica with particle uniformity, the method comprising: making water glass and concentrated sulfuric acid to undergo a precipitation reaction, thereby obtaining a suspension of precipitated silica, and then undergoing press filtration, washing, slurrying and The suspension was dried, wherein the precipitation reaction was carried out as follows:

[0066] (1) preparation raw material liquid water glass, in described liquid water glass, water glass concentration is with Na 2 O is expressed as 2.47N;

[0067] (2) prepare the initial bottom material of precipitation reaction, wherein contain a part of the water glass total amount used in described precipitation reaction, in described initial bottom material, water glass concentration is with Na 2 O is expressed as 0.07N, and the pH is 10.0;

[0068] (3) Add vitriol oil and excess water glass dropwise to the initial primer within 120 minutes, so that the water glass and vitriol are preci...

Embodiment 3

[0077] A method for preparing precipitated silica with particle uniformity, the method comprising: making water glass and concentrated sulfuric acid to undergo a precipitation reaction, thereby obtaining a suspension of precipitated silica, and then undergoing press filtration, washing, slurrying and The suspension was dried, wherein the precipitation reaction was carried out as follows:

[0078] (1) preparation raw material liquid water glass, in described liquid water glass, water glass concentration is with Na 2 O means 2.40N;

[0079] (2) prepare the initial bottom material of precipitation reaction, wherein contain a part of the water glass total amount used in described precipitation reaction, in described initial bottom material, water glass concentration is with Na 2 O is expressed as 0.10N and pH is 10.5

[0080] (3) Add vitriol oil and excess water glass dropwise to the initial base material simultaneously within 105 minutes, so that water glass and vitriol oil pre...

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Abstract

The invention relates to a method for preparing precipitated silicon dioxide with particle uniformity and further relates to spherical microbead silicon dioxide and use thereof. The silicon dioxide has the characteristics that the BET specific surface area is 100-250m<2> / g; the bulk density is 0.20-0.35cm<3> / g; the median particle diameter D50 is at least 200 mu m; the 40-mesh passing rate is greater than or equal to 90.0%; the 120-mesh passing rate is less than or equal to 12.0%; the free-running property is less than or equal to 35 degrees; the moisture is less than or equal to 7.0%. The precipitated silicon dioxide is used as a carrier and an anticaking agent in the industries of feeds, pesticides, medicines and foods.

Description

technical field [0001] The present invention relates to a new method for preparing precipitated silica with particle uniformity, and also relates to spherical microbead silica and powdered silica. Background technique [0002] Precipitated silica acts as a carrier and anti-caking agent in the feed, pesticide, pharmaceutical and food industries, converting fluids into solid ingredients that can flow freely and store stably. [0003] At present, many of the silicas used in the market are powdered and ultra-fine silica, which have long stirring time during use, poor fluidity, and produce a large amount of powder. [0004] In order to achieve the purpose of obtaining the best carrier and anti-caking effect by adding silica, it is necessary to ensure the uniformity of silica particle size, hardness and fluidity of the particles, and to be free of dust during use. [0005] CN 1114832A discloses a method for preparing precipitated silica, comprising reacting a silicate of alkali m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 陈南飞卢爱平陈辰
Owner WUXI HENGCHENG SILICON IND CO LTD
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