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Method for preparing nano hydrated calcium silicate using silican fume as siliceous materials

A technology for hydrating calcium silicate hydrate and siliceous raw materials, applied in silicate, nanotechnology, alkaline earth metal silicate, etc., can solve the problem of large differences in structure and performance of calcium silicate hydrate and unstable raw material components , harsh reaction conditions and other problems, to achieve the effect of low price, easy operation and mild reaction conditions

Active Publication Date: 2012-10-10
大同煤矿集团朔州煤电宏力再生工业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of slow reaction rate, harsh reaction conditions (higher temperature and pressure), SiO 2 The reaction degree is low, the yield is low, and the raw material components are not stable, and the structure and performance of the formed calcium silicate hydrate are quite different. To provide a low-cost, finer particles, higher activity, SiO 2 Preparation method of nano-calcium silicate hydrate with silica fume as siliceous raw material with high content, quick dissolution and easy reaction

Method used

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  • Method for preparing nano hydrated calcium silicate using silican fume as siliceous materials
  • Method for preparing nano hydrated calcium silicate using silican fume as siliceous materials
  • Method for preparing nano hydrated calcium silicate using silican fume as siliceous materials

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Embodiment 1

[0036] A preparation method of nano calcium silicate hydrate using silica fume as siliceous raw material, comprising the steps of:

[0037] (1) Take calcium oxide and silica fume and mix them evenly. Among them, the content of silica in silica fume accounts for 99%, so the mixing ratio of calcium oxide and silica fume is 1 according to the molar ratio of calcium oxide and silica fume. : The ratio of 2 is mixed evenly, and the amount of silica material is 99% of the actual mass of silica fume divided by the molar mass of silica; transfer the mixed raw materials into the reactor and add water, and the amount of water added is according to the water Add in a solid mass ratio of 30:1, add water and stir for 5 minutes, and finally react the mixed reactants in the reactor at 200°C for 9 hours;

[0038] (2) Wash the precipitated product obtained from the hydrothermal reaction in step (1) with water first, then treat it with ultrasonic waves for 6 minutes, then transfer it to a high-s...

Embodiment 2

[0046] A preparation method of nano calcium silicate hydrate using silica fume as siliceous raw material, comprising the steps of:

[0047] (1) Take calcium oxide and silica fume and mix them evenly. Among them, the content of silica in silica fume accounts for 99%, so the mixing ratio of calcium oxide and silica fume is 4 according to the molar ratio of calcium oxide and silica fume. : Mix evenly in a ratio of 5, the amount of silica is 99% of the actual mass of silica fume divided by the molar mass of silica; transfer the mixed raw materials into the reactor and add water, the amount of water added is according to the Add in a solid mass ratio of 30:1, add water and stir for 7 minutes, and finally react the mixed reactants in the reactor at 120°C for 8 hours;

[0048] (2) Wash the precipitated product obtained from the hydrothermal reaction in step (1) with water first, then treat it with ultrasonic waves for 5 minutes, then transfer it to a high-speed centrifuge, and separa...

Embodiment 3

[0050] A preparation method of nano calcium silicate hydrate using silica fume as siliceous raw material, comprising the steps of:

[0051] (1) Take calcium oxide and silica fume and mix them evenly. Among them, the content of silica in silica fume accounts for 99%, so the mixing ratio of calcium oxide and silica fume is 1 according to the molar ratio of calcium oxide and silica fume. : Mix evenly in a ratio of 1, the amount of silica fume is 99% of the actual mass of silica fume divided by the molar mass of silica; transfer the mixed raw materials into the reaction kettle and add water, the amount of water added is based on water Add in a solid mass ratio of 30:1, add water and stir for 6 minutes, and finally react the mixed reactants in the reactor at 140°C for 6 hours;

[0052] (2) Wash the precipitated product obtained from the hydrothermal reaction in step (1) with water first, then treat it with ultrasonic waves for 6 minutes, then transfer it to a high-speed centrifuge,...

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Abstract

The invention provides a method for preparing nano hydrated calcium silicate using silican fume as siliceous materials, and solves the problems of slow reaction rate, harsh reaction conditions, low SiO2 reaction degree, low yield, unstable raw material components, and relatively large structure and performance differences of the produced hydrated calcium silicate if current siliceous materials are used as raw materials for the hydrated calcium silicate. The method comprises utilizing the silican fume as siliceous materials and calcium oxide as calcareous materials, with water being added, mixing them in a reaction vessel, and getting the nano hydrated calcium silicate through stirring, hydrothermal reacting, ultrasonic treating, centrifugally separating and vacuum drying. The silican fume used as siliceous materials provided by the invention has advantages of wide source, low price, large specific surface area, strong adsorptivity, mild reaction condition and low impurity content, and thus can be produced into high-purity nano-powder. According to the invention, calcium-silicon ratio, reaction temperature and time can be regulated to control particle sizes of products, thereby obtaining products with excellent performance.

Description

technical field [0001] The invention relates to a method for preparing nano calcium silicate hydrate, in particular to a method for preparing nano calcium silicate hydrate through hydrothermal reaction using silica fume as a siliceous raw material. Background technique [0002] Calcium silicate hydrate particles are dendritic and porous, and exist in an amorphous state. The dendritic structure of the particles can make the particles fill in the main chain to produce intertwining, wrapping, and compacting effects, so it is reinforced in cement. , Rubber reinforcement and other fields play an important role. In recent years, the research on reinforcing additives has begun to rise, and calcium silicate hydrate has become one of the hot spots in nanomaterial science. [0003] Calcium silicate hydrate is an important nanomaterial. Because it has a large specific surface area and its particles are mostly fiber dendrites, it can be used as a reinforcing material because it can all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24B82Y40/00
Inventor 韩涛靳秀芝曹红红郭云霞雷永胜
Owner 大同煤矿集团朔州煤电宏力再生工业股份有限公司
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