Preparation method of precipitated silicon dioxide

A technology of precipitating silicon dioxide and silicon dioxide, applied in the direction of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problem that the inducing factors cannot be effectively eliminated or weakened, and it is difficult to prepare ultra-fine dispersion and disintegration properties. Precipitated silica and other problems, to avoid the formation of gel, prevent coagulation, prevent rapid aggregation

Inactive Publication Date: 2005-09-21
SHANDONG HAIHUA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned acid precipitation method, sol method and gel method are used to prepare precipitated silica, and its common disadvantages are: due to the local overconcentration of acid cannot be avoided in the process of acid-base reaction, it cannot be effectively eliminated or weakened. The inductive factor for the formation of gel components in the process of silica preparation, that is, the direct contact between silicic acid molecules and the rapid aggregation through hydrogen bonds, so the aggregation of silicic acid cannot be avoided, and preventing the formation of gel components is the key to the preparation of super The key to fine-grade precipitated silica with good dispersion and disintegration performance
Therefore, it is difficult to prepare ultrafine precipitated silica with good dispersion and disintegration properties by acid precipitation method, sol method and gel method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] Prepare a 0.5 mol / l magnesium sulfate solution, and use 25% sulfuric acid solution to adjust its pH value to 3.5.

[0037] The modulus (SiO 2 / Na 2 O) is 3.2, silicon dioxide content is 27%, the sodium silicate solution that specific gravity is 1.357 is diluted and made silicon dioxide content is the sodium silicate solution of 0.1mol / l, to the sodium silicate solution of 1 liter of 0.1mol / l Add 50ml of sodium dodecylbenzenesulfonate with a concentration of 0.2mol / l to the mixture, stir well and evenly, raise the temperature of the sodium silicate solution with sodium dodecylbenzenesulfonate to 70°C, and gradually Acidified 0.5mol / l magnesium sulfate solution was added to it, the temperature was kept constant, and a white precipitate was formed until the pH value of the reaction mixture reached 8.0, stirred and kept for 30 minutes for aging, and 1mol / l was added to the suspension Sulfuric acid, adjust the pH value to 2, heat-preserve and mature at a temperature of 70°...

example 2

[0044] Prepare a 1mol / l magnesium sulfate solution.

[0045] The modulus (SiO 2 / Na 2 O) is 3.2, silicon dioxide content is 27%, the sodium silicate solution that specific gravity is 1.357 is diluted to make silicon dioxide content and is 0.5mol / l, adds silicic acid in 1 liter of this sodium silicate solution Sodium solution weight 0.6% octadecyltrimethylammonium chloride, use 1mol / l hydrochloric acid solution to adjust the pH value to 10.5, heat up to 70 ° C, under stirring, slowly add 1mol / l magnesium sulfate solution, And keep the temperature constant until the pH value of the solution reaches 8.0. During this process, a white precipitate is generated. After mixing completely, a white suspension is obtained. Add 1mol / l sulfuric acid to the suspension to adjust the pH value to 4. The temperature is 80 DEG C and heat-insulated and matured for 60 minutes, the slurry is suction filtered, the obtained filter cake is washed twice with 0.5 mol / l sulfuric acid solution, and then ...

example 3

[0052] Prepare a 1mol / l magnesium sulfate solution.

[0053] The modulus (SiO 2 / Na 2 O) is 3.2, silicon dioxide content is 27%, the potassium silicate solution that specific gravity is 1.357 is diluted to make silicon dioxide content and is the potassium silicate solution of 1.3mol / l, under stirring, this solution is slowly added to 1 Raise temperature to 1mol / l magnesium sulfate solution at 70°C, and keep the temperature constant until the pH value of the solution reaches 8.0. During this process, a white precipitate is formed. After mixing completely, a white suspension is obtained. Add 1 mol / l sulfuric acid to the solution, adjust the pH value to 4, heat and mature at 80°C for 60 minutes, add Span-80 according to 1.5% of the weight of the potassium silicate solution, stir for 10 minutes, and filter the slurry to obtain The filter cake was washed twice with 0.5 mol / l sulfuric acid solution, and then washed with water. The filter cake was dried in an oven at a temperature...

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Abstract

The invention relates to a preparing method for depositing silica dioxide, which comprises the following steps: dissolving the silicate of alkali metal to saline solution a with water, dissolving the soluble salt of metallic ion with 2 valency or above 2 valency to saline solution b with water as a polymerization inhibitor, reacting with between saline solution a and saline solution b at a temperature of 10 -80 Deg. C to get the compound c, heating the compound c to 60-95 Deg. C, acidifying by adding acidating agent and adjust the PH in 1-5 to get the compound d1, then maturing 3-100 min with respect to heat to get the compound d2, filtering, washing and drying compound d2, to get the ultra-fine disposition silica dioxide.

Description

technical field [0001] The invention relates to a preparation method of precipitated silica. Background technique [0002] Precipitated silica is loose, finely dispersed silica with floc structure, and it is a widely used inorganic fine chemical material. At present, there are mainly three methods for preparing precipitated silica with alkali metal silicate solution as raw material: 1. Acid precipitation method, that is, adding acid to acidify alkali metal silicate solution in stages to precipitate silica , such as Chinese Patent No. 94117058.6, 96109937.2 and the technical scheme disclosed in German Patent Application No. DE-A1467019; 2. Sol method, which uses silica sol as raw material, and prepares precipitation by adding certain substances to make silica sol agglomerate Silica, such as the technical scheme disclosed in Chinese Patent No. 96104972.3; 3, gel method, it is to prepare precipitated silica with hydrous silica gel as raw material, as the technical scheme discl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01B33/193
Inventor 刘建路潘振兴傅贤君
Owner SHANDONG HAIHUA GRP CO LTD
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