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A preparation method of high-structure and high-wear-resistant hydrated silica

A technology of wear-resistant hydration and silica, applied in chemical instruments and methods, silicate, inorganic chemistry, etc., can solve the problem that hydrated silica is difficult to achieve high structure

Active Publication Date: 2020-03-17
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current production, hydrated silica is difficult to achieve high structural

Method used

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  • A preparation method of high-structure and high-wear-resistant hydrated silica

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Calcining 5 mol of quartz sand and 6 mol of soda ash at 1420°C for 1 hour to obtain solid sodium silicate;

[0017] (2) Dissolve 4.5 mol of solid sodium silicate in 1.8 L of sodium carbonate with a concentration of 3 mol / L to obtain a sodium silicate solution, and filter to remove impurities;

[0018] (3) Add 0.9 mol dispersant to the sodium silicate solution, and add 6 mol / L sulfuric acid solution to the sodium silicate solution dropwise to a total of 1.125 L under stirring conditions, the dropping rate is 5 mol / L, and precipitation occurs;

[0019] (4) Wash and dry the precipitate to obtain hydrated silica.

Embodiment 2

[0021] (1) Calcining 5mol of quartz sand and 7mol of soda ash at 1450°C for 1 hour to obtain solid sodium silicate;

[0022] (2) Dissolve 4.5 mol of solid sodium silicate in 1.35 L of sodium carbonate with a concentration of 5 mol / L to obtain a sodium silicate solution, and filter to remove impurities;

[0023] (3) Add 2.25mol dispersant to the sodium silicate solution, and add 4mol / L sulfuric acid solution to the sodium silicate solution dropwise to a total of 1.35L under stirring conditions, at a rate of 5mol / h, and precipitation occurs;

[0024] (4) Wash and dry the precipitate to obtain hydrated silica.

Embodiment 3

[0026] (1) Calcining 5 mol of quartz sand and 6.5 mol of soda ash at 1450°C for 1 hour to obtain solid sodium silicate;

[0027] (2) Dissolve 4.5 mol of solid sodium silicate in 1.575 L of sodium carbonate with a concentration of 4 mol / L to obtain a sodium silicate solution, and filter to remove impurities;

[0028] (3) Add 1.35mol dispersant to the sodium silicate solution, and add 5mol / L sulfuric acid solution to the sodium silicate solution dropwise under stirring conditions, a total of 1.26L, at a rate of 5mol / h, with precipitation;

[0029] (4) Wash and dry the precipitate to obtain hydrated silica.

[0030] Structural analysis of the hydrated silica obtained in Examples 1-3 shows that the proportion of adjacent hydroxyl groups on the silicon accounts for 70-90%, which can be described as a high-structure hydrated silica.

[0031] Rubber processing was carried out in accordance with HG / T2404-2008 "Identification of Hydrated Silica in Styrene Butadiene Rubber". Determina...

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Abstract

The invention discloses a preparation method of high structure and high abrasion resistant hydrated silica, and the preparation method is characterized by comprising the following steps: (1) burning quartz sand and sodium carbonate in a molar ratio of 1:1.5 at 1420-1450 DEG C for 1 hour to obtain solid sodium silicate; (2) dissolving the solid sodium silicate in sodium carbonate to obtain a sodium silicate solution, and filtering to remove impurities; (3) adding a dispersing agent to the sodium silicate solution, under stirring, adding dropwise a 4-6mol / L sulfuric acid solution into the sodium silicate solution to precipitate a sediment; and 4) washing and drying the sediment to obtain the hydrated silica. By the preparation method, the high structure and high abrasion resistant hydrated silica can be prepared.

Description

technical field [0001] The invention relates to the field of organic matter preparation, in particular to a method for preparing hydrated silicon dioxide with high structure and high wear resistance. Background technique [0002] Hydrated silica, also known as light silica, the main component is silica, white amorphous powder, light and loose, soluble in caustic alkali and hydrofluoric acid, insoluble in water, solvents and acids (hydrofluoride except acid). High temperature resistance, non-combustible, tasteless, odorless, with good electrical insulation. Its properties are similar to carbon black, but it is white. Molecular formula and structural formula available SiO 2 ·nH 2 O represents, where nH 2 O exists in the form of surface hydroxyl groups. Its macrostructure is similar to carbon black, the particles are spherical, and the monadic particles are in contact with each other in a chain-like connection structure (secondary structure). The chain branch structure i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/193C01B33/32
CPCC01B33/193C01B33/32
Inventor 王永庆
Owner QUECHEN SILICON CHEM